JP2015093584A - Vehicle power source support structure - Google Patents

Abstract

[PROBLEMS] To improve steering stability during both turns. An elastic center GD of a front mount portion 50, a rear mount portion 60, a right mount portion 30, and a left mount portion 32 is set so as to be located on the rear side in the vehicle longitudinal direction with respect to the center of gravity GP of an engine 12. As a result, a moment due to the centrifugal force applied to the engine 12 when the vehicle 10 is turning works in a direction to follow the movement of the vehicle 10, so that a sense of unity is obtained, and steering stability when the vehicle 10 turns is improved. [Selection] Figure 1

Description

  The present invention relates to a power source support structure for a vehicle.

  Patent Document 1 discloses a vehicle power source support structure used for supporting a vehicle power source to a vehicle body through a plurality of elastic mounting members. In this prior art, at least one of the plurality of mount members is attached to a subframe elastically supported by the vehicle body at a position lower than the height of the center of gravity of the power source (see Patent Document 1).

  Patent Document 2 discloses an engine support device that includes an engine mounting frame that is supported in a vibration-proof manner on a vehicle body, and an engine mount that has a stopper that restricts the roll of the engine. In this prior art, the noise in the vehicle interior is suppressed by setting the roll stopper clearance of the front engine mount and the shortest distance from the engine roll center to the center of the front engine mount to predetermined conditions in a stationary state. Thus, the comfort in the indoor space is improved (see Patent Document 2).

  Here, if the power source swings left and right due to centrifugal force when the vehicle turns, steering stability may be impaired. Therefore, there was room for improvement in this respect.

JP 2007-137421 A Japanese Patent Laid-Open No. 9-226386

  In view of the above, an object of the present invention is to provide a power source support structure for a vehicle that can improve steering stability during vehicle turning.

  According to the first aspect of the present invention, the elastic centers of the plurality of mount portions that support the power source of the vehicle in a plan view are set to be located on the rear side in the vehicle front-rear direction with respect to the center of gravity of the power source.

  According to the first aspect of the present invention, since the elastic centers of the plurality of mount portions are set to be positioned on the rear side in the vehicle front-rear direction with respect to the center of gravity of the power source in plan view, the centrifugal force applied to the power source when the vehicle turns The direction of the moment due to the force acts in the direction of following the movement of the vehicle. Therefore, the steering stability when the vehicle turns is improved.

  According to a second aspect of the present invention, in the structure according to the first aspect, the plurality of mount portions are provided at two locations on the front side and the rear side in the vehicle front-rear direction in the storage chamber in which the power source is stored. The elastic coefficients of the rear mount portion and the front mount portion are set so that the elastic center of the mount portion is located on the rear side in the vehicle longitudinal direction from the center of gravity of the power source.

  In the invention according to claim 2, the elastic coefficients of the rear mount portion and the front mount portion are set so that the elastic centers of the plurality of mount portions are located on the rear side in the vehicle front-rear direction with respect to the center of gravity of the power source. This improves the handling stability when the vehicle turns.

  According to a third aspect of the present invention, in the structure according to the first or second aspect, the plurality of mount portions are provided in at least two places on the right side and the left side in the vehicle width direction in the storage chamber in which the power source is stored. The support position at which the right mount part and the left mount part support the power source is set on the rear side in the vehicle front-rear direction with respect to the center of gravity of the power source.

  In the third aspect of the present invention, the elastic center of the plurality of mount portions is set to the power source by setting the support position of the right mount portion and the left mount portion to the rear side in the vehicle longitudinal direction from the center of gravity of the power source. The steering stability is improved when the vehicle turns, because the vehicle is located on the rear side in the vehicle longitudinal direction with respect to the center of gravity.

  According to a fourth aspect of the present invention, in the structure according to any one of the first to third aspects, the plurality of mount portions are provided on a right side and a left side in a vehicle width direction in a storage chamber in which the power source is stored. Provided at least in two places, the support position at which the right mount portion and the left mount portion support the power source is set above the center of gravity of the power source.

  In the invention according to claim 4, by setting the support position of the right mount portion and the left mount portion to the upper side of the vehicle than the center of gravity of the power source, the movement of the power source in the vehicle width direction when the vehicle turns is made. The steering stability is improved when the vehicle turns.

  According to the first aspect of the present invention, it is possible to improve the steering stability when turning the vehicle.

  According to the second aspect of the present invention, the steering stability during turning of the vehicle can be easily improved by adjusting the elastic coefficients of the rear mounting portion and the front mounting portion.

  According to the third aspect of the present invention, by setting the support position of the right mount portion and the left mount portion on the rear side in the vehicle front-rear direction with respect to the center of gravity of the power source, the steering stability when turning the vehicle can be easily performed. Can be improved.

  According to the fourth aspect of the present invention, the steering stability can be further improved by setting the support positions of the right mount portion and the left mount portion above the center of gravity of the power source.

1 is a perspective view of a front portion of a vehicle to which a power source support structure according to an embodiment of the present invention is applied. It is a top view of the front part of the vehicle shown in FIG. It is a front view of the front part of the vehicle shown in FIG. It is sectional drawing which shows typically the cross section along the vehicle front-back direction of the rear side mount part. It is a front view which shows a back side mounting part typically. It is sectional drawing which shows typically the cross section along the vehicle width direction of the front side mount part. FIG. 2 is a plan view for explaining a moment direction of an engine and a direction of a force acting on the vehicle when the vehicle shown in FIG. 1 turns right. It is a front view for demonstrating the magnitude | size of the shake of the engine width direction of the engine at the time of the vehicle shown in FIG. 1 turning. It is a graph which shows the relationship between the rigid body resonant frequency of the vehicle width direction of an engine at the time of turning, and inertance.

  A vehicle power source support structure according to an embodiment of the present invention will be described with reference to FIGS. Note that the front side in the vehicle front-rear direction is indicated by arrow FR, the outer side in the vehicle width direction is indicated by arrow OUT, and the upper side in the vehicle vertical direction is indicated by arrow UP. Further, the right direction (right side) and the left direction (left side) in the vehicle width direction are the left and right directions when facing the vehicle front side (forward side), the right direction (right side) is indicated by an arrow RH, and the left direction ( (Left side) is indicated by an arrow LH.

  As shown in FIG. 1, an engine as an example of a storage chamber in which an engine (power unit) 12 as an example of a power source is accommodated in a front portion of a vehicle 10 to which the power source support structure of the present embodiment is applied. A room 14 is provided (see also FIG. 7). The engine 12 has a transmission (not shown) coupled to one end of a crankshaft provided along the vehicle width direction (not shown).

  Front side members 18 extending in the vehicle front-rear direction are provided on both sides of the front portion of the vehicle 10 in the vehicle width direction. Further, an apron upper member 20 is disposed on the outer side in the vehicle width direction of the front side member 18 and on the upper side of the vehicle. The rear end portion of the apron upper member 20 is joined to a front pillar (not shown).

  As shown in FIGS. 1 to 3, a suspension tower 22 that supports an upper end portion of a suspension (not shown) is bridged between the apron upper member 20 and the front side member 18. The suspension tower 22 is joined to the front side member 18 and the apron upper member 20.

  An anti-vibration subframe 24 having a substantially ladder shape (see FIG. 1) in a plan view is provided below the front side member 18. The anti-vibration subframe 24 is bridged and joined between the left and right front side members 18.

  The anti-vibration sub-frame 24 extends in the vehicle front-rear direction and supports a pair of left and right arm support portions 26 that support a suspension arm (not shown), and a front frame portion that connects the front end portions of the pair of arm support portions 26 in the vehicle width direction. 28 and a rear frame portion 33 (see FIGS. 1 and 2) for connecting the rear end sides of the pair of arm support portions 26 in the vehicle width direction. Further, the front end side of the arm support portion 26 is joined to the front end side of the front side member 18, and the rear end side of the arm support portion 26 is joined to the rear end side of the front side member 18.

  A front mount portion 50 is provided at a substantially central portion in the vehicle width direction of the front frame portion 28 constituting the vibration isolation subframe 24, and a rear mount portion 60 ( 1 and 2). Further, the right side mount portion 30 is provided on the front side member 18 disposed on the right side in the vehicle width direction, and the left side mount portion 32 is provided on the front side member 18 disposed on the left side in the vehicle width direction.

  Thus, the front mount portion 50 is provided on the front side in the vehicle front-rear direction in the engine room 14, the rear mount portion 60 is provided on the rear side in the vehicle front-rear direction, and the right mount portion 30 is provided on the right side in the vehicle width direction. The left mount portion 32 is provided on the left side in the vehicle width direction (see also FIG. 7). The engine 12 (FIG. 1) is attached to the front mount portion 50, the rear mount portion 60 (see FIGS. 1 and 2), the right mount portion 30, and the left mount portion 32 provided on the front, rear, left and right sides of the engine room 14. Supported (see also FIG. 7).

  The front mount portion 50 and the rear mount portion 60 are main weight sharing mounts that play a role of mainly sharing the weight of the engine 12 (see FIG. 1). Therefore, the right mount portion 30 and the left mount portion 32 are non-weight sharing mounts. Moreover, the right side mount part 30 and the front side mount part 50 are comprised with the liquid injection type mount.

  As shown in FIGS. 1 and 2, a rear mount bracket 70 is provided on the rear mount portion 60, and a rear end portion of the engine 12 (see FIG. 1) is attached to the rear mount bracket 70. Yes. The rear mounting bracket 70 has a substantially rectangular fixing portion 72 in a front view, a pair of substantially rectangular side walls 74 extending from both ends of the fixing portion 72 in the vehicle width direction toward the rear side in the vehicle front-rear direction, (See also FIG. 5).

  As shown in FIGS. 2 and 4, the rear mount portion 60 includes an annular portion 62 formed in an annular shape with the vehicle width direction as an axial direction when viewed from the side of the vehicle, and a flange portion provided integrally with the annular portion 62. 64. As shown in FIG. 4, a rear elastic member 68 made of an elastic body such as rubber is provided inside the annular portion 62. As shown in FIGS. 2 and 5, the annular portion 62 is disposed between the side wall portions 74 of the rear mount bracket 70.

  As shown in FIGS. 4 and 5, the rear mount bracket 70 is attached to the rear mount portion 60 via a shaft 66 provided at the axial center portion of the annular portion 62. Further, as shown in FIG. 5, a side stopper 76 made of an elastic body such as rubber is provided between the side wall portion 74 of the rear mount bracket 70 and the rear mount portion 60. The side stopper 76 may be configured as a separate member from the rear mount portion 60, or may be formed integrally with the rear elastic member 68 of the rear mount portion 60.

  As shown in FIG. 6, the first mounting member 52 attached to the engine 12 (see FIG. 1) side and the vibration-proof subframe 24 side (see FIG. 1) are installed inside the upper end portion of the front mount portion 50. And a front elastic member 56 that connects the second mounting member 54 to be connected. Further, the front elastic member 56 has a structure in which a lower portion 58 is spread obliquely downward.

  As described above, the engine 12 is supported by the front mounting part 50, the rear mounting part 60, the right mounting part 30, and the left mounting part 32. As shown in FIGS. 1 and 2, the elastic center GD of the front mount portion 50, the rear mount portion 60, the right mount portion 30, and the left mount portion 32 is larger than the center of gravity GP of the engine 12 in plan view. It is set to be located on the rear side in the vehicle front-rear direction (see also FIG. 7).

  The position of the elastic center GD can be positioned behind the center of gravity GP by adjusting (setting) the elastic coefficients of the front mounting part 50 and the rear mounting part 60. In the present embodiment, the elastic coefficient of the rear mount portion 60 is adjusted (set) to be positioned on the rear side in the vehicle front-rear direction with respect to the center of gravity GP of the engine 12. Specifically, the elastic coefficient in the vehicle width direction is increased by increasing the width (thickness) in the vehicle width direction of the rear elastic member 68 of the rear mount portion 60 shown in FIG. In some cases, the elastic force in the vehicle width direction exerted by the rear mount portion 60 is increased), and the elastic center GD is moved rearward in the vehicle longitudinal direction from the center of gravity GP.

  As shown in FIGS. 1 and 2, the elastic center GD is set to be positioned above the center of gravity GP of the engine 12 in the vehicle vertical direction when viewed from the front.

  As shown in FIGS. 3 and 8, the support position where the right mount portion 30 and the left mount portion 32 support both ends of the engine 12 in the vehicle width direction is above the center of gravity GP of the engine 12 in the vehicle vertical direction. Is set.

<Action and effect>
Next, functions and effects of the present embodiment will be described.

  First, the case where the vehicle 10 turns rightward (vehicle width direction right side, traveling direction right side) will be described as an example. As shown in FIG. 7, when the steering (handle) 42 is operated in the right direction indicated by the arrow K1, the front wheel 40 is directed rightward, and the vehicle 10 turns right as indicated by the arrow K2.

  As described above, the elastic centers GD of the front mount portion 50, the rear mount portion 60, the right mount portion 30, and the left mount portion 32 are set so as to be located on the rear side in the vehicle longitudinal direction with respect to the center of gravity GP of the engine 12. (See also FIGS. 1 and 2). Therefore, the direction of the moment due to the centrifugal force applied to the engine 12 when the vehicle 10 turns right is leftward as indicated by the arrow K3. That is, the moment direction (arrow K3) of the engine 12 works in the direction opposite to the right direction (the operation direction of the steering wheel (arrow K1)) which is the turning direction (arrow K2).

  On the other hand, the vehicle 10 is subjected to a force that stays there, and therefore turns right (arrow K2) with a delay from the operation of the steering wheel (arrow K1). Therefore, a force in the left direction in the vehicle width direction indicated by the arrow K4 acts on the vehicle 10. That is, the force acting on the engine 12 works in the direction opposite to the right direction (the operation direction of the steering wheel 42 (arrow K1)) which is the turning direction (arrow K2).

  Therefore, when the vehicle 10 turns right, the moment direction of the engine 12 (arrow K3) and the direction of the force applied to the vehicle 10 (arrow K4) are the same leftward direction. Similarly, when the vehicle 10 turns left, the moment direction of the engine 12 and the direction of the force applied to the vehicle 10 are the same right direction. That is, the moment direction (arrow K3) of the engine 12 when the vehicle 10 turns is the same as the direction of the force applied to the vehicle 10 (arrow K4).

  As described above, the elastic center GD of the front mount portion 50, the rear mount portion 60, the right mount portion 30, and the left mount portion 32 is set so as to be located on the rear side in the vehicle longitudinal direction from the center of gravity GP of the engine 12. Thus, since the moment due to the centrifugal force applied to the engine 12 during the turning of the vehicle 10 works in a direction to follow the movement of the vehicle 10, a sense of unity can be obtained in the behavior of the vehicle 10 and the engine 12, and the steering stability when the vehicle 10 turns. Improves.

  Further, the position of the elastic center GD can be easily positioned on the rear side in the vehicle front-rear direction with respect to the center of gravity GP by adjusting (setting) the elastic coefficients of the front mount portion 50 and the rear mount portion 60. In the present embodiment, the elastic coefficient in the vehicle width direction is increased by increasing the width in the vehicle width direction of the rear elastic member 68 of the rear mount portion 60, and the elastic center GD is set to the front and rear of the vehicle more than the center of gravity GP. It is moved backward in the direction.

  Further, as shown in FIG. 8, the support positions of the right mount portion 30 and the left mount portion 32 are set on the vehicle upper side with respect to the center of gravity GP of the engine 12 (see also FIGS. 1 and 3). Therefore, the movement M1 of the engine 12 in the vehicle width direction when the vehicle 10 turns is lower than the center of gravity GP as shown in the support positions of the right mount portion 130 and the left mount portion 132 indicated by an imaginary line (two-dot broken line). Compared to the movement M2 of the comparative example set to, it becomes smaller. Therefore, the support rigidity of the engine 12 in the vehicle width direction is increased, and the steering stability is improved.

  More specifically, as shown in FIG. 9, when the support rigidity increases, the rigid resonance S1 in the vehicle width direction of the engine 12 (see FIGS. 1 and 7) moves to the high frequency side, and the normal frequency range (steering) 42 (see FIG. 7) The input frequency from the operation) is away from the high frequency side S2 of S3. Therefore, the influence of the rigid body resonance S1 in the vehicle width direction of the engine 12 is reduced, that is, the influence of the inertial force in the vehicle width direction of the engine 12 due to the resonance is reduced, and the steering stability is improved.

  Further, the front-side mount portion 50 and the rear-side mount portion 60 that are main weight-sharing mounts that play a role of mainly sharing the weight of the engine 12 (see FIG. 1) are supported by the vibration-proof subframe 24, thereby allowing the engine 12. The vibration in the vertical direction of the vehicle is attenuated and passenger comfort is improved.

  Furthermore, the ride comfort of the occupant is further improved by using the liquid injection mount having high damping performance for the right mount portion 30 and the front mount portion 50.

<Other methods for adjusting the position of the elastic center GD>
In the present embodiment, the elastic coefficient in the vehicle width direction is increased by increasing the width in the vehicle width direction of the rear elastic member 68 of the rear mount portion 60, and the elastic center GD is rearward in the vehicle front-rear direction with respect to the center of gravity GP. However, the present invention is not limited to this.

  By increasing the width in the vehicle width direction of the side stopper 76 formed of an elastic body such as rubber of the rear mount portion 60 shown in FIG. 5, the elastic coefficient in the vehicle width direction is increased, and the elastic center GD is set to the center of gravity GP. Alternatively, the vehicle may be moved (positioned) rearward in the vehicle front-rear direction.

  Further, the elastic coefficient of the rear mount portion 60 may be increased by another method, and the elastic center GD may be moved (positioned) rearward in the vehicle front-rear direction with respect to the center of gravity GP.

  Alternatively, the elastic coefficient of the front mounting portion 50 may be reduced, and the elastic center GD may be moved (positioned) to the rear side in the vehicle front-rear direction with respect to the center of gravity GP. For example, by reducing the thickness of the lower portion 58 of the front elastic member 56 shown in FIG. 6, the elastic coefficient of the front mount portion 50 is reduced, and the elastic center GD is moved rearward in the vehicle longitudinal direction from the center of gravity GP (position). ).

  In addition, at least one of the front mount portion 50 and the rear mount portion 60 is a control mount whose elastic coefficient can be electrically controlled (for example, a mount using a magnetic fluid whose viscosity changes according to a magnetic field), and an elastic center. You may control so that GD may be located in the vehicle front-back direction back side rather than the gravity center GP.

  In short, the elastic coefficient of the front mounting part 50 and the elastic coefficient of the rear mounting part 60 may be adjusted so that the elastic center GD is positioned behind the center of gravity GP in the vehicle front-rear direction.

  Alternatively, the front center 50 and the rear mount 60 are inclined toward the vehicle rear side of the center of gravity GP in a side view of the vehicle, so that the elastic center GD is positioned (moved) behind the center of gravity GP in the vehicle front-rear direction. You may let them.

  Alternatively, as in the right mount portion 30A and the left mount portion 32A indicated by imaginary lines (two-dot broken lines) in FIG. 7, the support position for supporting the engine 12 is positioned rearward in the vehicle longitudinal direction from the center of gravity GP of the engine 12. By setting so as to do, the elastic center GD may be moved (positioned) rearward in the vehicle front-rear direction from the center of gravity GP.

Further, a plurality of methods for adjusting the position of the elastic center GD may be appropriately combined.
In short, the elastic center GD of the front mounting part 50, the rear mounting part 60, the right mounting part 30, and the left mounting part 32 only needs to be positioned behind the center of gravity GP of the engine 12 in the vehicle longitudinal direction.

<Others>
The present invention is not limited to the above embodiment.

  In the above embodiment, the right mount portion 30 is provided on the right side in the vehicle width direction at the front portion of the vehicle 10, the left mount portion 32 is provided on the left side in the vehicle width direction, the front mount portion 50 is provided on the front side in the vehicle front-rear direction, The rear mount portion 60 is provided on the rear side, that is, the mount portions for supporting the engine are provided at the front, rear, left and right four locations in the front portion of the vehicle 10, but the present invention is not limited to this. You may provide the mount part which supports an engine besides these four places.

  Furthermore, it cannot be overemphasized that it can implement with a various aspect in the range which does not deviate from the summary of this invention.

10 Vehicle 12 Engine (an example of a power source)
14 Engine room (an example of a containment room)
30 Right mount (right mount)
30A Right mount (right mount)
32 Left mount (left mount)
32A Left mount (left mount)
50 Front mounting part (front mounting part)
60 Front mount (rear mount)
GD Elastic center GP Center of gravity

Claims (4)

  A power source support structure for a vehicle, wherein the center of elasticity of a plurality of mount portions that support the power source of the vehicle in a plan view is set to be located on the rear side in the vehicle front-rear direction with respect to the center of gravity of the power source. The plurality of mount portions are provided in at least two locations on the front side and the rear side in the vehicle front-rear direction in the storage chamber in which the power source is stored,
The elastic coefficient of the rear mount part and the front mount part is set so that the elastic centers of the plurality of mount parts are located on the rear side in the vehicle front-rear direction with respect to the center of gravity of the power source. Vehicle power source support structure. The plurality of mount portions are provided in at least two places on the right side and the left side in the vehicle width direction in the storage chamber in which the power source is stored,
The vehicle according to claim 1 or 2, wherein a support position at which the right mount portion and the left mount portion support the power source is set on the rear side in the vehicle front-rear direction with respect to the center of gravity of the power source. Power source support structure. The plurality of mount portions are provided in at least two places on the right side and the left side in the vehicle width direction in the storage chamber in which the power source is stored,
The support position where the right mount part and the left mount part support the power source is set on the vehicle upper side with respect to the center of gravity of the power source. The vehicle power source support structure as described.

Images