JP2010012882A - Suspension device - Google Patents

Abstract

A suspension device capable of reducing road noise in a vehicle interior is provided.
A sub-frame 2 provided in a suspension device 1 includes an upper frame member 4 formed in a plate shape and a lower frame member 6 formed in a U-shaped cross section, and the lower frame member 6 includes: The front lower link member mounting portion 14F for mounting the front lower link 12F and the rear lower link member mounting portion 14R for mounting the rear lower link 12R are provided, and the front lower link member mounting portion 14F for the subframe 2 is provided. And the rear lower link member mounting portion 14R are provided, and the rigidity reinforcing member 44 is formed in a shape in which the width direction extends in the vehicle vertical direction.
[Selection] Figure 5

Description

  The present invention relates to a suspension device for a vehicle.

The vehicle suspension device includes a plurality of link members as described in Patent Document 1, for example.
Each of the link members connects a wheel support member (axle) that rotatably supports a wheel and a subframe that forms a suspension member and the like. Each link member includes two lower links arranged in the vehicle front-rear direction, and one upper link arranged above the lower link in the vehicle vertical direction.
The two lower links are arranged apart from each other in the vehicle front-rear direction. The two lower links are both disposed below the vertical position of the vehicle in the vertical direction of the vehicle in the vertical direction of the vehicle.
JP 2006-56311 A

  In the suspension device described in Patent Document 1, when the wheel contacts the unevenness on the road surface, the road surface reaction force at the time of contact is transmitted to the subframe via the lower link. The lower link is disposed below the vertical position of the vehicle in the vehicle vertical direction of the subframe, so the road surface reaction force transmitted to the lower link is reduced in the axial direction of the lower link with respect to the subframe. Apply force. In addition to this, it also acts in the direction of bending the subframe due to the difference in the vehicle vertical direction position between the lower link and the subframe, which may increase the deformation of the subframe.

If the deformation of the subframe is large, the level of vibration generated in the subframe may increase. When the vibration generated in the subframe is transmitted to the vehicle interior, this vibration forms noise (road noise). Therefore, when the subframe is deformed, there is a possibility that a problem of increasing road noise in the passenger compartment may occur.
The present invention has been made paying attention to the above-described problems, and is a suspension capable of reducing road noise in a vehicle cabin by suppressing deformation of a subframe caused by input to a link member. It is an object to provide an apparatus.

  In order to solve the above-described problems, the suspension device according to the present invention is configured so that the attachment portion of the two link members that connect the wheel support member to the subframe is connected to the subframe from the center position of the width of the subframe in the vehicle vertical direction. Is also placed below. The sub-frame includes a rigidity reinforcing member that connects the two vehicle body side member attaching portions.

  According to the present invention, it is possible to reduce the vibration level generated in the subframe by suppressing the deformation of the subframe generated by the input received by the link member from the road surface, thereby reducing the road noise in the vehicle interior. It becomes possible.

Hereinafter, the best mode for carrying out the present invention (hereinafter referred to as “embodiment”) will be described with reference to the drawings.
(First embodiment)
(Constitution)
First, a basic configuration of the suspension device 1 will be described with reference to FIGS. 1 to 3.
FIG. 1 is a top view showing a suspension device 1 of the present embodiment. FIG. 2 is a view taken along the line II in FIG. 1 and is a bottom view of the suspension device 1. FIG. 3 is a side view taken along the line III in FIG. 1 and is a side view of the suspension device 1.
As shown in FIGS. 1 to 3, the suspension device 1 includes a subframe 2.

The subframe 2 is formed from a main body portion 2a formed in a substantially rectangular parallelepiped shape and four leg portions 2b.
The main body 2a is formed in a substantially rectangular parallelepiped.
Each of the four leg portions 2b extends in the vehicle front-rear direction from four corner portions of the main body portion 2a. Specifically, of the four leg portions 2b, the two leg portions 2b in front of the main body portion 2a in the vehicle front-rear direction extend forward in the vehicle front-rear direction with respect to the main body portion 2a. Of the four leg portions 2b, the two leg portions 2b at the rear in the vehicle front-rear direction with respect to the main body portion 2a extend rearward in the vehicle front-rear direction with respect to the main body portion 2a. Thereby, the shape of the sub-frame 2 is substantially X-shaped when viewed from above.

Further, the subframe 2 includes an upper frame member 4 formed in a plate shape and a lower frame member 6 formed in a U-shaped cross section.
The upper frame member 4 and the lower frame member 6 are coupled to each other in the vehicle vertical direction by a fixing means such as welding to constitute the subframe 2. As a result, a gap is formed between the upper frame member 4 and the lower frame member 6. That is, the subframe 2 has a hollow structure.

The upper frame member 4 has an upper link member attachment portion 10 to which the upper link 8 is attached. In addition, the description regarding the upper link 8 is mentioned later.
The upper link member mounting portion 10 includes a pair of left upper link member mounting portions 10L and right upper link member mounting portions 10R.
The left upper link member mounting portion 10L is disposed on the left side (the right side in FIG. 1 and the left side in FIG. 2) of the center of the subframe 2 in the vehicle width direction. Further, the right upper link member mounting portion 10R is arranged on the right side (the left side in FIG. 1 and the right side in FIG. 2) of the subframe 2 in the vehicle width direction center. That is, the left upper link member mounting portion 10L and the right upper link member mounting portion 10R are arranged on the left and right sides of the center of the subframe 2 in the vehicle width direction.

The lower frame member 6 includes two lower link member attachment portions 14 to which the two lower links 12 are attached, and four vehicle body side member attachment portions 18 to be attached to the vehicle body side member 16. In addition, the description regarding the two lower links 12 is mentioned later. In the present embodiment, as an example, the vehicle body side member 16 is a side member.
Each of the two lower link member attachment portions 14 has a link member attachment point P to which the lower link 12 is attached. In the drawings and the following description, in order to distinguish the two link member attachment points P, among the link member attachment points P of the lower link member attachment portions 14, the link member attachments arranged forward in the vehicle longitudinal direction. The point P is described as the front link member attachment point PF. Similarly, the link member attachment point P disposed rearward in the vehicle front-rear direction is referred to as a rear link member attachment point PR.

  The front link member attachment point PF and the rear link member attachment point PR are arranged so as to be offset from each other in the vehicle longitudinal direction. Further, both the front side link member attachment point PF and the rear side link member attachment point PR are disposed below the center position C of the width of the subframe 2 in the vehicle vertical direction. That is, the two lower link member attachment portions 14 are both disposed below the center position C of the width of the subframe 2 in the vehicle vertical direction. In the drawings and the following description, in order to distinguish between the two lower link member mounting portions 14, the lower link member mounting portion 14 disposed forward in the vehicle front-rear direction among the lower link member mounting portions 14 is the front side. It is described as a lower link member mounting portion 14F. Similarly, the lower link member mounting portion 14 disposed rearward in the vehicle front-rear direction is referred to as a rear lower link member mounting portion 14R.

The front lower link member attachment portion 14F includes a pair of left front lower link member attachment portions 14FL and a right front lower link member attachment portion 14FR.
The left front lower link member mounting portion 14FL is disposed on the left side (left side in FIG. 2) of the center of the subframe 2 in the vehicle width direction. Further, the right front lower link member attachment portion 14FR is disposed on the right side (right side in FIG. 2) of the subframe 2 in the vehicle width direction center. That is, the left front lower link member mounting portion 14FL and the right front lower link member mounting portion 14FR are arranged on the left and right sides of the center in the vehicle width direction of the subframe 2.

The rear lower link member attaching portion 14R includes a pair of left rear lower link member attaching portions 14RL and a right rear lower link member attaching portion 14RR.
The left rear lower link member attachment portion 14RL is disposed on the left side (left side in FIG. 2) of the subframe 2 in the vehicle width direction center. Further, the right rear lower link member mounting portion 14RR is arranged on the right side (right side in FIG. 2) of the center of the subframe 2 in the vehicle width direction. That is, the left rear side lower link member attachment portion 14RL and the right rear side lower link member attachment portion 14RR are arranged on the left and right sides of the center in the vehicle width direction of the subframe 2.

The four vehicle body side member attaching portions 18 are formed at the tips of the four leg portions 2b. Thereby, the four vehicle body side member attaching parts 18 are respectively arranged in the vehicle front-rear direction front and the vehicle front-rear direction rear rather than the rigidity reinforcing member described later.
Each vehicle body side member mounting portion 18 is formed in a cylindrical shape whose axis is directed in the vehicle vertical direction. The subframe 2 may be attached to the vehicle body side member 16 in a directly attached state, or a bush may be disposed inside each vehicle body side member attachment portion 18 and attached via this bush. . As a result, the subframe 2 is attached to the vehicle body side member 16 via the vehicle body side member attachment portions 18.

As described above, the sub frame 2 is connected to the vehicle body side member 16 via the two vehicle body side member mounting portions 18 separated in the vehicle front-rear direction on the left and right sides with respect to the center in the vehicle width direction.
The subframe 2 also includes two link member attachment portions 14 to which two link members (lower links 12) are attached, respectively, between two vehicle body side member attachment portions 18 that are separated in the vehicle front-rear direction.
The upper link 8 connects the upper region of a wheel support member (axle) (not shown) and the subframe 2. In addition, the description regarding a wheel support member is mentioned later. 2 and 3, the illustration of the upper link 8 is omitted for the sake of explanation.

The two lower links 12 are arranged so as to be separated from each other in the vehicle front-rear direction. In FIG. 1 and the following description, in order to distinguish between the two lower links 12, the lower link 12 that is disposed forward in the vehicle front-rear direction among the lower links 12 is referred to as a front lower link 12F. Similarly, the lower link 12 disposed rearward in the vehicle front-rear direction is referred to as a rear lower link 12R. 2 and 3, the illustration of each lower link 12 is omitted for the sake of explanation.
Both the front lower link 12F and the rear lower link 12R connect the lower region of the wheel support member and the subframe 2.

Next, detailed configurations of the upper link 8, the front lower link 12F, and the rear lower link 12R will be described with reference to FIG.
4 is a top view of the upper link 8, the front lower link 12F, and the rear lower link 12R.
As shown in FIG. 4, the upper link 8, the front lower link 12 </ b> F, and the rear lower link 12 </ b> R form a link member that connects the wheel support member 22 that rotatably supports the wheel 20 and the subframe 2. .
The end of the upper link 8 on the side of the wheel support member 22 is attached to the wheel support member 22 via a bush 24 so as to be swingable in the vehicle vertical direction. The end of the upper link 8 on the subframe 2 side is attached to the subframe 2 via a bush 26 so as to be swingable in the vehicle vertical direction.

The bush 24 and the bush 26 are configured by interposing an elastic body formed using a rubber body between an outer cylinder and an inner cylinder arranged in a nested manner. In the present embodiment, a case where the outer cylinder is fixed to the end portion of the upper link 8 and the inner cylinder is attached to the wheel support member 22 or the subframe 2 via a bolt will be described.
An end portion of the front lower link 12F on the wheel support member 22 side is attached to the wheel support member 22 via a bush 28 in a state that can swing in the vehicle vertical direction. The end portion of the front lower link 12F on the subframe 2 side is attached to the subframe 2, specifically, the front lower link member mounting portion 14F via the bush 30 so as to be swingable in the vehicle vertical direction. .

The bush 28 and the bush 30 are configured by interposing an elastic body between the outer cylinder and the inner cylinder. In the present embodiment, a case will be described in which the outer cylinder is fixed to the end portion of the front lower link 12F, and the inner cylinder is attached to the wheel support member 22 or the subframe 2 via a bolt.
Here, the axis of the front lower link 12F, that is, the straight line connecting the bush 28 and the bush 30 is inclined with respect to the vehicle width direction.

The rear lower link 12 </ b> R includes an overhang portion 32.
An end portion of the rear lower link 12R on the wheel support member 22 side is attached to the wheel support member 22 via a bush 34 in a state that can swing in the vehicle vertical direction. The end portion on the subframe 2 side of the rear lower link 12R is attached to the subframe 2 via a bush 36 in a state that can swing in the vehicle vertical direction. That is, the rear lower link 12R is attached to the wheel support member 22 and the subframe 2 via the bush 34 and the bush 36 so as to be swingable in the vehicle vertical direction.

The bush 34 is configured by interposing an elastic body between the outer cylinder and the inner cylinder in the same manner as the bush 24 described above. This embodiment demonstrates the case where an outer cylinder is fixed to the wheel support member 22, and an inner cylinder is attached to the edge part of the rear side lower link 12R via a volt | bolt.
The bush 36 is configured by interposing an elastic body between the outer cylinder and the inner cylinder in the same manner as the bush 24 described above. In the present embodiment, a case will be described in which the outer cylinder is fixed to the end portion of the rear lower link 12R and the inner cylinder is attached to the vehicle body side member 16 via a bolt.

Moreover, the elastic body with which the bush 36 is provided uses an elastic body with higher rigidity than the elastic body with which the bush 30 is provided. Thereby, the rigidity of the bush 36 is made higher than the rigidity of the bush 30.
Here, the axis of the rear lower link 12R, that is, the straight line connecting the bush 34 and the bush 36 is substantially parallel to the vehicle width direction.
The projecting portion 32 is formed in a shape projecting forward in the vehicle front-rear direction toward the front lower link 12F. As a result, the shape of the rear lower link 12R is substantially trapezoidal when viewed from above.
Further, the overhanging portion 32 projects toward the front lower link 12F, thereby forming a proximity portion where the front lower link 12F and the rear lower link 12R are close to each other.

  The adjacent portion formed by the overhanging portion 32, that is, the portion of the rear lower link 12R that faces the front lower link 12F in the vehicle front-rear direction has two connecting bushes 38, 40 that are arranged offset in the vehicle width direction. To the front lower link 12F. That is, the front lower link 12F and the rear lower link 12R are elastically connected to each other via the connection bushes 38 and 40. Therefore, the connection bushes 38 and 40 are disposed in close proximity and form an elastic member that elastically connects the front lower link 12F and the rear lower link 12R.

  In the present embodiment, the connecting bushes 38, 40 are arranged with the shaft substantially in the vehicle front-rear direction in a top view, the outer cylinder is fixed to the front lower link 12F, and the inner cylinder is attached to the mounting bolt. It fixes to the overhang | projection part 32 via. As a result, the front lower link 12F and the rear lower link 12R are connected to the three-dimensionally swingable state by the connecting bushes 38 and 40, and the swing amount is restricted to a constant amount.

  The connecting bushes 38 and 40 have anisotropy that has relatively high vertical rigidity and low vehicle width rigidity. For example, this configuration is implemented by adjusting the upper and lower rigidity of the elastic bodies included in the connecting bushes 38 and 40 by inserting intermediate plates harder than the elastic bodies above and below the inner cylinder. To do. In addition, a currant (cavity) is formed on both side portions of the inner cylinder, and the adjustment is performed so that the rigidity in the vehicle width direction is lowered.

Next, a detailed configuration of the subframe 2, specifically, the lower frame member 6, will be described with reference to FIGS. 1 to 4 and FIGS. 5 to 7.
FIG. 5 is a view in which the upper frame member 4 is removed from the subframe 2 shown in FIG. 1 and is a top view showing the configuration of the lower frame member 6.
As shown in FIG. 5, a rigid reinforcing member relay portion 42 and a rigid reinforcing member 44 are provided for the lower frame member 6.
The stiffness reinforcing member relay portion 42 includes a pair of left side stiffness reinforcing member relay portions 42L and a right side stiffness reinforcing member relay portion 42R.

Both the left side rigid reinforcing member relay part 42L and the right side rigid reinforcing member relay part 42R are formed in a plate shape whose width direction extends in the vehicle vertical direction. Further, the left side rigidity reinforcing member relay part 42L and the right side rigidity reinforcing member relay part 42R are both arranged closer to the center in the vehicle width direction than the lower link member attaching part 14.
The left-side rigid reinforcing member relay portion 42L is disposed on the left side (right side in FIG. 5) of the center of the subframe 2 in the vehicle width direction.
Further, the left side rigid reinforcing member relay portion 42L is fixed to a surface of the lower frame member 6 facing the upper frame member 4 by fixing means such as welding. Note that the left-side rigid reinforcing member relay portion 42 </ b> L may be fixed to a surface facing the lower frame member 6 of the upper frame member 4.

The right-side rigidity reinforcing member relay portion 42R is disposed on the right side (left side in FIG. 5) of the center of the subframe 2 in the vehicle width direction. That is, the left side rigid reinforcing member relay part 42L and the right side rigid reinforcing member relay part 42R are arranged on the left and right sides of the center of the subframe 2 in the vehicle width direction.
Further, the right-side rigidity reinforcing member relay portion 42R is fixed to the surface of the lower frame member 6 facing the upper frame member 4 by fixing means such as welding, like the left-side rigidity reinforcing member relay portion 42L. Note that the right-side rigid reinforcing member relay portion 42R may be fixed to a surface facing the lower frame member 6 of the upper frame member 4 in the same manner as the left-side rigid reinforcing member relay portion 42L.

The rigidity reinforcing member 44 is formed in a plate shape whose width direction extends in the vehicle vertical direction using a material having rigidity such as a steel material. As a result, the configuration of the rigidity reinforcing member 44 is configured to have rigidity in the vehicle vertical direction.
Further, the rigidity reinforcing member 44 has a left side rigidity reinforcing member 44L disposed on the outer side in the vehicle width direction (right side in FIG. 5) than the left side rigidity reinforcing member relay part 42L, and a vehicle width wider than the right side rigidity reinforcing member relay part 42R. And a right-side rigidity reinforcing member 44R disposed outward in the direction (left side in FIG. 5).

The left side stiffness reinforcing member 44L includes a left front side stiffness reinforcing member 44FL and a left rear side stiffness reinforcing member 44RL.
Both the left front rigidity reinforcing member 44FL and the left rear rigidity reinforcing member 44RL are formed in a shape extending from the outside in the vehicle width direction toward the center in the vehicle width direction of the lower frame member 6 when viewed from above. Thereby, both the left front side rigidity reinforcing member 44FL and the left rear side rigidity reinforcing member 44RL are extended from the outside in the vehicle width direction toward the center in the vehicle width direction of the subframe 2 in a top view.

The left front side rigidity reinforcing member 44FL is arranged at a position facing the left front side lower link member mounting portion 14FL and the lower frame member 6 therebetween.
The surface facing the lower frame member 6 of the left front side rigidity reinforcing member 44FL is fixed to the surface of the lower frame member 6 facing the upper frame member 4 by using fixing means such as welding. Note that the surface of the left front stiffness reinforcing member 44FL facing the upper frame member 4 may be fixed to the surface facing the lower frame member 6 of the upper frame member 4.

The surface of the left front side rigidity reinforcing member 44FL facing the vehicle body side member mounting portion 18 is fixed to the outer peripheral surface of the vehicle body side member mounting portion 18 by using fixing means such as welding. As a result, the left front side rigid reinforcing member 44FL is fixed to the vehicle body side member attaching portion 18.
The surface facing the left-side rigidity reinforcing member relay portion 42L of the left front-side rigidity reinforcing member 44FL is entirely formed on the surface on the outer side in the vehicle width direction of the left-side rigidity reinforcing member relay portion 42L using fixing means such as welding. Fix it. Thereby, the left front side rigidity reinforcing member 44FL continues the vehicle body side member mounting portion 18 and the left side rigidity reinforcing member relay portion 42L along the length direction.

The left rear side rigidity reinforcing member 44RL is disposed at a position facing the left rear side lower link member mounting portion 14RL with the lower frame member 6 therebetween.
The surface facing the lower frame member 6 of the left rear side rigidity reinforcing member 44RL is fixed to the surface of the lower frame member 6 facing the upper frame member 4 using fixing means such as welding. Note that the surface of the left rear side rigidity reinforcing member 44RL facing the upper frame member 4 may be fixed to the surface facing the lower frame member 6 of the upper frame member 4.

Therefore, the left side rigidity reinforcing member 44L connects the left front lower link member mounting portion 14FL and the left rear lower link member mounting portion 14RL.
The surface of the left rear side rigidity reinforcing member 44RL facing the vehicle body side member mounting portion 18 is fixed to the outer peripheral surface of the vehicle body side member mounting portion 18 using fixing means such as welding. As a result, the left front side rigid reinforcing member 44FL is fixed to the vehicle body side member attaching portion 18.

The surface facing the left-side rigidity reinforcing member relay portion 42L of the left rear-side rigidity reinforcing member 44RL is entirely the surface on the outer side in the vehicle width direction of the left-side rigidity reinforcing member relay portion 42L using fixing means such as welding. Secure to. Thereby, the left rear side rigidity reinforcing member 44RL continues the vehicle body side member attaching portion 18 and the left side rigidity reinforcing member relay portion 42L along the length direction.
As described above, a part of the left side rigid reinforcing member 44L that is continuously extending from the left front side lower link member attaching part 14FL to the left rear side lower link member attaching part 14RL is fixed to the left side rigid reinforcing member relay part 42L. To do.

The right rigidity reinforcing member 44R includes a right front rigidity reinforcing member 44FR and a right rear rigidity reinforcing member 44RR.
Both the right front side rigid reinforcing member 44FR and the right rear side rigid reinforcing member 44RR are formed in a shape extending from the outside in the vehicle width direction toward the center in the vehicle width direction of the lower frame member 6 in a top view. Thereby, both the right front side rigid reinforcing member 44FR and the right rear side rigid reinforcing member 44RR are extended from the outside in the vehicle width direction toward the center in the vehicle width direction of the subframe 2 in a top view.

The right front side rigidity reinforcing member 44FR is arranged at a position facing the right front side lower link member mounting portion 14FR and the lower frame member 6 therebetween.
The surface facing the lower frame member 6 of the right front side rigid reinforcing member 44FR is fixed to the surface facing the upper frame member 4 of the lower frame member 6 by using fixing means such as welding throughout. Note that the surface of the right front side rigidity reinforcing member 44FR facing the upper frame member 4 may be fixed to the surface of the upper front frame member 4 facing the lower frame member 6.

The surface facing the vehicle body side member mounting portion 18 of the right front side rigidity reinforcing member 44FR is fixed to the outer peripheral surface of the vehicle body side member mounting portion 18 using fixing means such as welding. As a result, the right front side rigidity reinforcing member 44FR is fixed to the vehicle body side member mounting portion 18.
The surface facing the right-side rigidity reinforcing member relay portion 42R of the right front side rigidity reinforcing member 44FR is entirely formed on the surface on the outer side in the vehicle width direction of the right-side rigidity reinforcing member relay portion 42R by using fixing means such as welding. Fix it. Thereby, the right front side rigid reinforcement member 44FR continues the vehicle body side member attachment part 18 and the right side rigidity reinforcement member relay part 42R along the length direction.

The right rear rigidity reinforcing member 44RR is disposed at a position facing the right rear lower link member mounting portion 14RR with the lower frame member 6 therebetween.
The surface facing the lower frame member 6 of the right rear side rigidity reinforcing member 44RR is fixed to the surface of the lower frame member 6 facing the upper frame member 4 by using fixing means such as welding. Note that the surface of the right rear side rigid reinforcing member 44RR that faces the upper frame member 4 may be fixed to the surface of the upper frame member 4 that faces the lower frame member 6.

Therefore, the right-side rigidity reinforcing member 44R connects the right front lower link member mounting portion 14FR and the right rear lower link member mounting portion 14RR.
The surface facing the vehicle body side member mounting portion 18 of the right rear side rigidity reinforcing member 44RR is fixed to the outer peripheral surface of the vehicle body side member mounting portion 18 using fixing means such as welding. As a result, the right front side rigidity reinforcing member 44FR is fixed to the vehicle body side member mounting portion 18.

The surface opposite to the right-side rigidity reinforcing member relay portion 42R of the right rear-side rigidity reinforcing member 44RR is a surface on the outer side in the vehicle width direction of the right-side rigidity reinforcing member relay portion 42R by using fixing means such as welding. Secure to. Thereby, the right rear side rigidity reinforcing member 44RR continues the vehicle body side member attaching portion 18 and the right side rigidity reinforcing member relay portion 42R along the length direction.
As described above, a portion of the right side rigid reinforcing member 44R that is continuously extending from the right front side lower link member mounting portion 14FR to the right rear side lower link member mounting portion 14RR is fixed to the right side rigid reinforcing member relay portion 42R. To do.

FIG. 6 is an enlarged view of the area surrounded by an ellipse V in FIG. 5 and its surroundings, and is an enlarged top view of a part of the lower frame member 6.
As shown in FIG. 6, a rigidity increasing member 46 is provided for the lower frame member 6, that is, the subframe 2.
The rigidity increasing member 46 includes a pair of left side rigidity increasing member 46L and right side rigidity increasing member 46R.
The left-side rigidity increasing member 46L is disposed on the left side (left side in FIG. 6) of the subframe 2 in the vehicle width direction center. Further, the right rigidity increasing member 46R is disposed on the right side (right side in FIG. 6) of the center of the subframe 2 in the vehicle width direction. That is, the left side rigidity increasing member 46L and the right side rigidity increasing member 46R are arranged on the left and right sides of the center of the subframe 2 in the vehicle width direction.

The left side rigidity increasing member 46L is formed in a plate shape having a larger area than the left rear side lower link member attaching portion 14RL in a top view.
Further, the left side rigidity increasing member 46L is disposed to face the left rear side lower link member mounting portion 14RL in the vehicle vertical direction. That is, the left side rigidity increasing member 46L faces the subframe 2 in the vehicle vertical direction.
The surface facing the lower frame member 6 of the left-side rigidity increasing member 46L is fixed to the surface facing the upper frame member 4 of the lower frame member 6 using fixing means such as welding throughout. As a result, a portion of the left rigidity increasing member 46L that faces the left rear lower link member mounting portion 14RL across the subframe 2 is fixed to the subframe 2 in a surface contact state.

The right rigidity increasing member 46R is formed in a plate shape having a larger area than the right rear lower link member mounting portion 14RR when viewed from above.
Further, the right rigidity increasing member 46R is disposed to face the right rear lower link member mounting portion 14RR in the vehicle vertical direction. That is, the right rigidity increasing member 46R faces the subframe 2 in the vehicle vertical direction, like the left rigidity increasing member 46L.
The surface facing the lower frame member 6 of the right rigidity increasing member 46R is fixed to the surface of the lower frame member 6 facing the upper frame member 4 by using fixing means such as welding. As a result, a portion of the right rigidity increasing member 46R that faces the right rear lower link member mounting portion 14RR across the subframe 2 is fixed to the subframe 2 in a surface contact state.

FIG. 7 is a view taken along line VI in FIG.
As shown in FIG. 7, the left rear side lower link member attaching portion 14RL and the right rear side lower link member attaching portion 14RR are connected by a link member attaching portion connecting member 48. That is, the suspension device 1 includes a link member attachment portion connecting member 48 that connects the left rear side lower link member attachment portion 14RL and the right rear side lower link member attachment portion 14RR.
The link member attachment portion connecting member 48 is formed in a rod shape whose shaft extends in the vehicle width direction using a material having rigidity such as steel. Thereby, the structure of the link member attaching part connection member 48 is made into the structure which has the rigidity of a vehicle width direction.

(Operation)
Next, the operation of the suspension device 1 will be described with reference to FIGS. 1 to 7 and FIG.
When the vehicle equipped with the suspension device 1 travels, for example, when the wheel 20 is in contact with the unevenness on the road surface, the wheel support member 22 is driven in the vehicle width direction, the vehicle vertical direction, Receives input in the front-rear direction.
The input received by the wheel support member 22 is transmitted to the subframe 2 via the upper link 8, the front lower link 12F, and the rear lower link 12R. The input transmitted to the subframe 2 is an input that causes the subframe 2 to be deformed.

Here, in the suspension device 1 of the present embodiment, the rigidity of the bush 36 is made higher than the rigidity of the bush 30. Further, the axis of the rear lower link 12R, that is, the straight line connecting the bush 34 and the bush 36 is substantially parallel to the vehicle width direction (see FIG. 4).
Thereby, most of the input in the vehicle front-rear direction received by the wheel support member 22 during traveling of the vehicle is transmitted to the subframe 2 via the rear lower link 12R.

Hereinafter, of the inputs in the vehicle front-rear direction received by the wheel support member 22, the inputs transmitted to the subframe 2 via the rear lower link 12R will be described.
The deformation that occurs in the subframe 2 due to the input received by the rear lower link 12R is such that the subframe 2 bends as shown in FIG. FIG. 8 is a diagram illustrating an example of a modification that occurs in the subframe 2.

  This is because the front lower link member mounting portion 14F and the rear lower link member mounting portion 14R are arranged so as to be offset from each other in the vehicle front-rear direction, and the vehicle is positioned above and below the center position C of the width of the subframe 2 in the vehicle vertical direction. It is for arranging in the lower direction. Accordingly, the position of the rear lower link member mounting portion 14R and the position of the center position C of the width of the subframe 2 in the vehicle vertical direction are greatly different in the vehicle vertical direction. For this reason, the input received by the rear lower link 12R is transmitted to the rear lower link member mounting portion 14R, and a large moment is applied to the center position C of the width of the subframe 2 in the vehicle vertical direction. The frame 2 is deformed.

On the other hand, in the suspension device 1 of the present embodiment, the rigidity in the vehicle vertical direction is provided at a position facing the front lower link member mounting portion 14F and the rear lower link member mounting portion 14R with the lower frame member 6 therebetween. The rigid reinforcing member 44 having the above is disposed (see FIG. 5).
In addition, the surface facing the lower frame member 6 of the rigid reinforcing member 44 is fixed to the lower frame member 6 (see FIG. 5). Thereby, the rigidity reinforcement member 44 which connects the front side lower link member attachment part 14F and the rear side lower link member attachment part 14R with respect to the sub-frame 2 is provided (refer FIG. 5).

For this reason, it becomes possible to increase the rigidity of the portion of the lower frame member 6 that faces the front lower link member mounting portion 14F and the rear lower link member mounting portion 14R.
Therefore, it is possible to suppress deformation in the vehicle front-rear direction that occurs in the subframe 2 due to the input in the vehicle front-rear direction received by the rear lower link 12R from the road surface.

(Effects of the first embodiment)
(1) When a vehicle provided with the suspension device of the present embodiment travels, when the wheels come into contact with unevenness on the road surface, the input received from the road surface is transmitted to the lower frame member via the rear lower link. Since the rear lower link is mounted below the vehicle vertical direction center position of the lower frame member in the vehicle vertical direction, the input received from the road surface transmitted to the rear lower link is applied to the lower frame member. On the other hand, the axial force of the rear lower link is applied. In addition to this, a force that bends the lower frame member in the vehicle vertical direction due to the difference in the vehicle vertical direction position between the rear lower link and the lower frame member acts, and the deformation of the lower frame is caused. growing.

On the other hand, in the suspension device of the present embodiment, by providing a rigid reinforcing member that connects the two vehicle body side member mounting portions to the entire subframe including the lower frame, the subframe in the vehicle vertical direction is provided. The rigidity against deformation is improved.
As a result, the vibration level generated in the lower frame member can be reduced, and road noise in the passenger compartment can be reduced, so that comfort during vehicle travel can be improved.
Here, the rear lower link corresponds to one of the two link members described in claim 1, and the lower frame member corresponds to the subframe described in claim 1.

(2) Further, in the suspension device of the present embodiment, the sub-frame is attached to the vehicle body side member via the vehicle body side member attachment portion arranged in the vehicle front-rear direction front and the vehicle front-rear direction rear of the rigidity reinforcing member.
In addition to this, the rigid reinforcing member is fixed to the vehicle body side member mounting portion of the lower frame member.
For this reason, it becomes possible to increase the cross-sectional secondary moment of the rigid reinforcing member as compared with the case where the rigid reinforcing member is not fixed to the vehicle body side member attaching portion. Further, it is possible to increase the rigidity against torsion of the rigidity reinforcing member as compared with the case where the rigidity reinforcing member is not fixed to the vehicle body side member attaching portion.

As a result, the rigidity in the vehicle vertical direction of the lower frame member included in the portion between the front lower link member mounting portion and the rear lower link member mounting portion and the vehicle body side member mounting portion is increased by the rigidity reinforcing member. It becomes possible to make it. Further, it is possible to reduce the occurrence of stress concentration between the lower frame member and the rigid reinforcing member.
As a result, it becomes possible to increase the rigidity of the entire lower frame member, so that it is possible to further suppress the deformation that occurs in the lower frame member, and further reduce the vibration level generated in the lower frame member. It becomes possible to make it.

(3) In the suspension device of the present embodiment, the rigid reinforcing member is formed in a plate shape whose width direction extends in the vehicle vertical direction.
For this reason, it becomes possible to make the structure of a rigidity reinforcement member into the structure which has the rigidity to an up-down direction by forming a rigidity reinforcement member in a simple shape.
As a result, the manufacturing cost of the rigid reinforcing member can be reduced.

(4) Further, in the suspension device of the present embodiment, the sub-frame is provided with a rigid reinforcing member relay portion that is located on the center side in the vehicle width direction relative to the rigid reinforcing member and is fixed to the sub frame.
In addition, the rigid reinforcing member relay portion is formed in a plate shape whose width direction extends in the vehicle vertical direction. Furthermore, a part of the rigid reinforcing member that is continuously extending from the front link member attaching part to the rear link member attaching part is fixed to the rigid reinforcing member relay part.
For this reason, compared with the case where a rigid reinforcement member is not fixed to a rigid reinforcement member relay part, it becomes possible to increase the cross-sectional secondary moment of a rigid reinforcement member. In addition, it is possible to increase the rigidity against torsion of the rigidity reinforcing member as compared with the case where the rigidity reinforcing member is not fixed to the rigidity reinforcing member relay portion.

Thereby, the rigidity of the vehicle vertical direction which the part of a vehicle width direction center side has rather than a front side lower link member attachment part and a rear side lower link member attachment part among lower frame members increases with a rigidity reinforcement member. Is possible. Further, it is possible to reduce the occurrence of stress concentration between the lower frame member and the rigid reinforcing member.
As a result, it becomes possible to increase the rigidity of the entire lower frame member, so that it is possible to further suppress the deformation that occurs in the lower frame member, and further reduce the vibration level generated in the lower frame member. It becomes possible to make it.

(5) Further, in the suspension device of the present embodiment, the left rear lower link member mounting portion and the right rear lower link member mounting portion are connected by a connecting stiffening member extending in the vehicle width direction.
For this reason, it becomes possible to suppress the deformation | transformation of the vehicle width direction which arises between a left rear side lower link member attaching part and a right rear side lower link member attaching part.
As a result, the rigidity in the vehicle width direction of the entire lower frame member can be increased, so that deformation in the vehicle width direction that occurs in the lower frame member can be suppressed, which occurs in the lower frame member. The vibration level can be further reduced.

(6) Further, in the suspension device of the present embodiment, the area of the sub frame is larger than that of the rear lower link member mounting portion in a top view, and faces the rear lower link member mounting portion in the vehicle vertical direction. A plate-like rigidity increasing member is provided.
For this reason, in addition to the rigidity of the portion of the lower frame member facing the rear lower link member mounting portion, it is possible to increase the rigidity of the portion wider than the rear lower link member mounting portion in top view. .
As a result, since the deformation of the lower frame member can be further suppressed by the rigidity increasing member, the vibration level generated in the lower frame member can be further reduced by the rigidity increasing member. .

(7) Further, in the suspension device of the present embodiment, the rear lower link includes an overhang portion that projects toward the front lower link. Further, the overhang portion forms a proximity portion where the front lower link and the rear lower link are close to each other.
In addition to this, the front lower link and the rear lower link are elastically connected to each other through an elastic member disposed in the proximity portion.
For this reason, it becomes possible to increase the rigidity with respect to the load in the vehicle width direction by connecting the front lower link and the rear lower link.
As a result, the rigidity of the vehicle support member in the vehicle front-rear direction can be set low to improve riding comfort, and the degree of freedom in designing the rear lower link can be improved. As a result, it is possible to achieve both the ride comfort of the vehicle and the handling stability, and to improve the durability and design freedom of the suspension device.

(Application examples)
(1) In the suspension device 1 of the present embodiment, the sub-frame 2 is configured to include the upper frame member 4 and the lower frame member 6, but is not limited thereto. That is, the configuration of the subframe 2 may be configured to include only the lower frame member 6. In this case, the configuration of the lower frame member 6 is a configuration having the upper link member mounting portion 10.

(2) Further, in the suspension device 1 of the present embodiment, the configuration of the rigidity reinforcing member 44 is configured to have rigidity in the vehicle vertical direction, but is not limited thereto, in addition to the rigidity in the vehicle vertical direction, It is good also as a structure which has the rigidity of a vehicle width direction, and the rigidity of a vehicle front-back direction. In short, the configuration of the rigidity reinforcing member 44 may be a configuration having at least rigidity in the vehicle vertical direction.

(3) Further, in the suspension device 1 of the present embodiment, the rigid reinforcing member 44 is disposed at a position facing the front lower link member mounting portion 14F and the rear lower link member mounting portion 14R with the lower frame member 6 therebetween. However, the present invention is not limited to this. That is, the rigidity reinforcing member 44 may be disposed in the vicinity of a position facing the front lower link member mounting portion 14F and the rear lower link member mounting portion 14R with the lower frame member 6 interposed therebetween.

(4) Further, in the suspension device 1 of the present embodiment, the portion facing the lower frame member 6 of the rigid reinforcing member 44 is fixed to the lower frame member 6 throughout, but the present invention is not limited to this. Absent. That is, among the portions facing the lower frame member 6 of the rigid reinforcing member 44, only the portions facing the front lower link member mounting portion 14F and the rear lower link member mounting portion 14R with the lower frame member 6 therebetween, It may be fixed to the lower frame member 6. Of the portion facing the lower frame member 6 of the rigid reinforcement member 44, only the vicinity of the position facing the lower frame member 6 with the front lower link member mounting portion 14F and the rear lower link member mounting portion 14R interposed therebetween. May be fixed to the lower frame member 6.

(5) Further, in the suspension device 1 of the present embodiment, the rigid reinforcing member 44 is fixed to the vehicle body side member attaching portion 18, but the present invention is not limited to this, and the rigid reinforcing member 44 is attached to the vehicle body side member attaching portion 18. It is good also as a structure which is not fixed. However, as in the present embodiment, it is preferable to fix the rigidity reinforcing member 44 to the vehicle body side member mounting portion 18 because the rigidity of the entire lower frame member 6 can be increased.

(6) In the suspension device 1 of the present embodiment, the rigid reinforcing member 44 is fixed to the rigid reinforcing member relay portion 42, but the present invention is not limited to this. That is, the rigid reinforcing member 44 may not be fixed to the rigid reinforcing member relay portion 42. However, as in the present embodiment, it is preferable to fix the rigidity reinforcing member 44 to the rigidity reinforcing member relay portion 42 because the rigidity of the entire lower frame member 6 can be increased.

(7) In addition, the suspension device 1 of the present embodiment includes a link member attachment portion connecting member 48 that connects the left rear lower link member attachment portion 14RL and the right rear lower link member attachment portion 14RR. However, the present invention is not limited to this. That is, the configuration may be such that the link member attachment portion connecting member 48 is not provided, and the left rear lower link member attachment portion 14RL and the right rear lower link member attachment portion 14RR are not connected. However, as in the present embodiment, the configuration including the link member attachment portion connecting member 48 is preferable because the rigidity of the entire lower frame member 6 in the vehicle width direction can be increased.

(8) Further, in the suspension device 1 of the present embodiment, the rigidity increasing member 46 is provided for the subframe 2. However, the present invention is not limited to this, and the rigidity increasing member 46 is provided for the subframe 2. It is good also as a structure which does not provide. However, it is possible to further suppress the deformation of the lower frame member by the rigidity increasing member 46 by providing the rigidity increasing member 46 to the subframe 2 as in the present embodiment. Therefore, it is preferable.

(9) In the suspension device 1 of the present embodiment, the rigidity increasing member 46 is disposed only at a position facing the left rear lower link member mounting portion 14RL and the right rear lower link member mounting portion 14RR in the vehicle vertical direction. However, the present invention is not limited to this. That is, the rigidity increasing member 46 may be disposed at a position facing the left front lower link member mounting portion 14FL and the right front lower link member mounting portion 14FR in the vehicle vertical direction.

(10) In the suspension device 1 of the present embodiment, the rigidity reinforcing member 44 is formed in a plate shape whose width direction extends in the vehicle vertical direction. However, the present invention is not limited to this. For example, the rigidity reinforcing member 44 may be formed in a columnar shape or a rod shape. In short, the configuration of the rigidity reinforcing member 44 may be a configuration having rigidity in the vehicle vertical direction.
(11) Further, in the suspension device 1 of the present embodiment, the surface facing the lower frame member 6 of the rigidity increasing member 46 is fixed to the lower frame member 6 throughout, but the present invention is not limited to this. Absent. That is, of the surface facing the lower frame member 6 of the rigidity increasing member, only the portion facing the front lower link member mounting portion 14F and the rear lower link member mounting portion 14R is fixed to the lower frame member 6. Also good.

(12) In the suspension device 1 of the present embodiment, the rigid reinforcing member relay portion 42 and the rigid reinforcing member 44 are provided for the sub-frame 2, but the present invention is not limited to this. That is, it is good also as a structure which does not provide the rigid reinforcement member relay part 42 with respect to the sub-frame 2. FIG. In this case, for example, the left rigid reinforcing member 44L may be configured such that the left front rigid reinforcing member 44FL and the left rear rigid reinforcing member 44RL are formed of a single plate-like member. Similarly, the right-side rigidity reinforcing member 44R may be configured such that the right front-side rigidity reinforcing member 44FR and the right rear-side rigidity reinforcing member 44RR are formed by a single plate-like member.

(13) Further, in the suspension device 1 of the present embodiment, the front lower link 12F and the rear lower link 12R are elastically connected to each other via the connection bushes 38 and 40 disposed in the adjacent portions. It is not limited to. That is, for example, the front lower link 12F and the rear lower link 12R are not connected to each other, and the front lower link 12F and the rear lower link 12R each independently connect the wheel support member 22 to the subframe 2. Also good.

(14) In the suspension device 1 of the present embodiment, the link member (upper link 8, lower link 12) and the wheel support member 22 or the subframe 2 are connected via the bushes, but the present invention is limited to this. It is not a thing. That is, instead of the bush, for example, the link member and the wheel support member 22 or the subframe 2 may be connected via a pillow ball.

(15) In the suspension device 1 of the present embodiment, the shape of the rear lower link 12R is substantially trapezoidal when viewed from above, but the shape of the rear lower link 12R is not limited to this. . That is, for example, the shape of the rear lower link 12R may be a rod shape in a top view. Similarly, the shape of the front lower link 12F may be substantially trapezoidal when viewed from above.

(Second embodiment)
Next, a second embodiment of the present invention will be described.
(Constitution)
First, with reference to FIG. 9, the structure of the suspension apparatus of this embodiment is demonstrated.
FIG. 9 is a diagram showing the configuration of the suspension device 1 of the present embodiment, and is a bottom view of the subframe 2. In addition, in FIG. 9, illustration of a lower frame member and a link member is abbreviate | omitted for description.
As shown in FIG. 9, the configuration of the suspension device 1 of the present embodiment is the same as that of the first embodiment described above, except for the configurations of the rear lower link member mounting portion 14 </ b> R and the rigidity reinforcing member 44. In addition, since it is set as the structure similar to 1st embodiment mentioned above except the back side lower link member attaching part 14R and the rigid reinforcement member 44, detailed description is abbreviate | omitted.

The rear lower link member attachment portion 14 </ b> R includes a link holding portion 50 and a through portion 52.
The link holding unit 50 is formed in a U-shaped cross section with the opening facing outward in the vehicle width direction, and a bush (not shown) is disposed between two surfaces facing each other. This bush is used when the rear lower link is attached to the rear lower link member attachment portion 14R.

The penetrating portion 52 is formed in a cylindrical shape having a square cross section, and penetrates the lower frame member in the vehicle vertical direction. Moreover, the penetration part 52 arrange | positions an axis | shaft toward the vehicle up-down direction in the space | gap part formed between the upper side frame member 4 and the lower side frame member.
A portion of the penetrating portion 52 that faces the upper frame member 4 and the lower frame member is fixed to the upper frame member 4 and the lower frame member by fixing means such as welding. Thus, the rear lower link member mounting portion 14R is fixed to the upper frame member 4 and the lower frame member.

The part of the penetrating part 52 that faces the link holding part 50 is coupled to the link holding part 50 by fixing means such as welding. The through portion 52 and the link holding portion 50 may be integrally formed to form the rear lower link member attaching portion 14R.
The rigidity reinforcing member 44 includes a front side rigidity reinforcing member 44F and a rear side rigidity reinforcing member 44R.

The front rigidity reinforcing member 44F is disposed at a position facing the front lower link member mounting portion (not shown) and the lower frame member 6 therebetween. Further, the surface facing the lower frame member of the front side rigidity reinforcing member (not shown) is fixed to the surface facing the upper frame member 4 of the lower frame member using fixing means such as welding throughout. To do.
The rear rigidity reinforcing member 44R is disposed in the vicinity of a position facing the rear lower link member mounting portion (not shown) and the lower frame member. Specifically, it arrange | positions rather than the position which opposes on both sides of a rear lower link member attaching part and a lower frame member, and arrange | positions in the vehicle front-back direction front side.

The surface of the rear side rigidity reinforcing member 44 </ b> R facing the penetrating portion 52 is brought close to or in contact with the penetrating portion 52. In the present embodiment, the surface facing the penetrating portion 52 of the rear side rigid reinforcing member 44R is brought into contact with the penetrating portion 52, and the rear side rigid reinforcing member 44R and the penetrating portion 52 are coupled using a fixing means such as welding. To do.
The surface facing the lower frame member of the rear side rigidity reinforcing member 44R is fixed to the surface of the lower frame member facing the upper frame member 4 by using fixing means such as welding.
Other configurations are the same as those of the first embodiment described above.

(Operation)
Next, the operation of the suspension device 1 will be described with reference to FIGS. 4 and 8 and FIG. In the following description, since the configuration other than the rear lower link member attachment portion 14R and the rigidity reinforcing member 44 is the same as that of the first embodiment described above, the description will focus on the operation of different parts.
When the vehicle equipped with the suspension device 1 travels, most of the input in the vehicle front-rear direction received by the wheel support member 22 due to the wheels 20 coming into contact with the unevenness on the road surface or the like is via the rear lower link 12R. Are transmitted to subframe 2 (see FIG. 4).
The deformation that occurs in the subframe 2 due to the input received by the rear lower link 12R is such that the subframe 2 is bent (see FIG. 8).

On the other hand, in the suspension device 1 of the present embodiment, the rear lower link member attaching portion 14R is fixed to the upper frame member 4 and the lower frame member. In addition to this, the rear side rigid reinforcement member 44R is disposed in the vicinity of the position facing the rear lower link member attachment portion and the lower frame member, and the rear side rigidity reinforcement member 44R and the through portion 52 are coupled. To do.
For this reason, it is possible to increase the rigidity of the portion of the lower frame member that faces the rear lower link member mounting portion 14R by the rear lower link member mounting portion 14R and the rear side rigidity reinforcing member 44R.
Therefore, it is possible to suppress deformation in the vehicle front-rear direction that occurs in the subframe 2 due to input in the vehicle front-rear direction received by the rear lower link from the road surface.

(Effect of the second embodiment)
(1) When a vehicle provided with the suspension device of the present embodiment travels, when the wheels come into contact with unevenness on the road surface, the input received from the road surface is transmitted to the lower frame member via the rear lower link. Then, the input received from the road surface transmitted to the rear lower link causes the axial force of the rear lower link to act on the lower frame member. In addition to this, a force that bends the lower frame member in the vertical direction of the vehicle acts, and deformation of the lower frame increases.

On the other hand, in the suspension device of the present embodiment, the rigidity of the subframe against deformation in the vehicle vertical direction is improved by fixing the rear lower link member mounting portion to the upper frame member and the lower frame member.
Specifically, the rear lower link member mounting portion can increase the rigidity of the portion of the lower frame member that faces the rear lower link member mounting portion. Thereby, it becomes possible to suppress the deformation | transformation which arises in a lower frame member by the input which a rear side lower link receives from a road surface.

As a result, the vibration level generated in the lower frame member can be reduced, and road noise in the passenger compartment can be reduced, so that comfort during vehicle travel can be improved.
Further, since the rear lower link member mounting portion has a function of increasing the rigidity of the subframe, the rear lower link member mounting portion functions as a rigidity increasing member of the subframe. As a result, an increase in the mass of the suspension device can be suppressed, and the rigidity of the subframe can be increased, so that the mass efficiency can be improved.

(Application examples)
(1) In the suspension device 1 of the present embodiment, the rear rigidity reinforcing member 44R is disposed on the front side in the vehicle front-rear direction with respect to the position facing the rear lower link member mounting portion 14R and the lower frame member. However, the present invention is not limited to this. That is, the rear-side rigidity reinforcing member 44R may be disposed at a position facing the rear-side lower link member mounting portion 14R and the lower-side frame member. In this case, for example, a slit having a shape into which the rear rigidity reinforcing member 44R can be inserted is formed in the penetrating portion 52, and the rear rigidity reinforcing member 44R is inserted into the slit so that the rear rigidity is inserted into the through portion 52. A reinforcing member 44R is disposed.

(2) In the suspension device 1 of the present embodiment, the rear side rigid reinforcing member 44RL and the through portion 52 are coupled, but the present invention is not limited to this, and the rear side rigid reinforcing member 44RL and the through portion 52 are connected to each other. It is not necessary to combine them. However, as in the present embodiment, it is preferable to couple the rear side rigidity reinforcing member 44RL and the penetrating portion 52 because the rigidity of the entire subframe 2 can be increased.

It is a top view which shows the suspension apparatus 1 of 1st embodiment of this invention. FIG. 2 is a view taken along line II in FIG. 1. FIG. 3 is a view taken along line III in FIG. 1. FIG. 4 is a view taken along line IV in FIG. 1. 4 is a top view showing a configuration of a lower frame member 6. FIG. FIG. 6 is an enlarged view of a range surrounded by an ellipse VI in FIG. 5 and its surroundings. It is a VII line arrow directional view of FIG. It is a figure which shows an example of the deformation | transformation which arises in the sub-frame 2. It is a figure which shows the suspension apparatus 1 of 2nd embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Suspension apparatus 2 Sub frame 4 Upper frame member 6 Lower frame member 8 Upper link 10 Upper link member attaching part 12F, 12R Lower link (two link members)
14F, 14R Lower link member mounting part (two link member mounting parts)
16 Vehicle body side member 18 Vehicle body side member mounting portion 20 Wheel 22 Wheel support member 24, 26, 28, 30 Bush 32 Overhang portion 34, 36 Bush 38, 40 Connection bush 42 Rigid reinforcement member relay portion 44 Rigid reinforcement member 46 Rigidity increase member Member 48 link member attachment portion connecting member 50 link holding portion 52 penetrating portion P link member attachment point C center position of width of subframe 2 in the vehicle vertical direction

Claims (7)

A sub-frame connected to the vehicle body side member via two vehicle body side member mounting portions spaced in the vehicle longitudinal direction on the left and right sides with respect to the center in the vehicle width direction,
Two link members that connect a wheel support member that rotatably supports a wheel to the subframe are arranged apart from each other in the vehicle longitudinal direction,
The sub-frame has two link member attachment portions for attaching the two link members, respectively, between two vehicle body side member attachment portions that are separated in the vehicle longitudinal direction.
The suspension device that disposes the two link member attachment portions below the center position of the width of the subframe in the vehicle vertical direction,
The suspension device according to claim 1, wherein the sub-frame includes a rigidity reinforcing member that connects the two vehicle body side member attaching portions.   The suspension device according to claim 1, wherein the rigidity reinforcing member is formed in a plate shape whose width direction extends in a vehicle vertical direction. The subframe is provided with a rigidity reinforcing member relay portion that is positioned closer to the center in the vehicle width direction than the rigidity reinforcing member and is fixed to the subframe.
The rigid reinforcing member relay portion is formed in a plate shape whose width direction extends in the vehicle vertical direction,
Among the rigid reinforcing members, a portion of the intermediate portion extending continuously from one of the link member mounting portions or a position in the vicinity thereof to the other link member mounting portion or a position in the vicinity thereof is used as the rigid reinforcing member relay portion. The suspension device according to claim 2, wherein the suspension device is fixed. Each of the two link member attachment portions includes a pair of left link member attachment portions and right link member attachment portions arranged on the left and right sides of the vehicle width direction center of the subframe,
The left link member mounting portion and the right link member mounting portion included in at least one of the two link member mounting portions are connected by a connecting stiffening member extending in the vehicle width direction. The suspension device according to any one of 1 to 3.   The sub-frame is provided with a plate-like rigidity increasing member that has a larger area than the link member mounting portion in a top view and faces the position of the link member mounting portion or its vicinity in the vehicle vertical direction. The suspension device according to any one of claims 1 to 4. The sub-frame includes an upper frame member and a lower frame member that are opposed to each other in the vehicle up-down direction.
6. The suspension device according to claim 1, wherein at least one of the two link member attachment portions is fixed to the upper frame member and the lower frame member. One link member of the two link members includes an overhanging portion that projects toward the other link member,
The overhang portion forms a proximity portion where the two link members are close to each other,
The suspension device according to any one of claims 1 to 6, wherein the two link members are elastically connected to each other via an elastic member disposed at the adjacent portion.

Images