JP2014069792A - Vehicle suspension device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the deformation of a vehicle body by suppressing the transmission of the collision load to the vehicle body by early releasing the connection between the lower arm and the vehicle body when a collision load is applied to the wheel from the front. I will provide a.
A lower arm coupled to a vehicle body and supporting a wheel is provided, a wheel support portion of the lower arm supports a wheel, and a vehicle body front connection portion of the lower arm extends forward of the vehicle body and is connected to the vehicle body. In the vehicle suspension system in which the rear vehicle body connection portion 12 of the lower arm extends rearward of the vehicle body and is connected to the vehicle body by the bracket 14, the vehicle rear connection portion 12 has a vehicle front-rear direction that is more forward than the bracket 14. Further, a plate-like protrusion 19 facing the bracket 14 is formed, and when a collision load is applied to the wheel from the front, the collision load is transmitted from the protrusion 19 to the bracket 14. Yes.
[Selection] Figure 1

Description

  The present invention relates to a vehicle suspension device including a lower arm that is connected to a vehicle body and supports wheels.

  When a collision load is applied to the front wheel due to an offset collision or a minute lap collision while the vehicle is traveling, the collision load is transmitted from the front wheel to the vehicle body via the lower arm, and the vehicle body is greatly deformed. Examples of measures for suppressing the deformation of the vehicle body are described in Patent Document 1 and Patent Document 2.

  The vehicle body front structure described in Patent Document 1 will be briefly described. When the front wheel support lower arm receives a collision load from the front wheel side and moves rearward, the front wheel support lower arm moves to the left or right side of the suspension member. The rear end of the frame side is pressed backward inward in the vehicle width direction, so that the rear end of the left or right frame side rotates around the rear connection part between the suspension member and the side member, while The rear frame side part is bent by moving to the rear side, and the rear side frame side part bends to promote the rotation of the rear end part of the left side or right side frame part. Bend to protrude inward. This vehicle body front structure reduces the amount of deformation of the side member in the vehicle front-rear direction by deforming both the side member and the suspension member when a collision load is applied to the front wheels, and the rear of the suspension member. It is said that movement to can be suppressed.

  The vehicle suspension device described in Patent Document 2 will be briefly described. The lower arm extends in the front-rear direction of the vehicle body, and is an arm that is elastically supported on the vehicle body by the front pivot support and the rear pivot support. A base, and an arm body that extends integrally from the arm base toward the outside of the vehicle body and supports a wheel at its extended end, and a longitudinal direction between the rear pivot support and the base of the arm body As the deformation promotion part is formed in a part of the arm base between the two, and the part of the arm base is buckled and deformed by an impact force in the width direction in a plan view of the vehicle, the deformation promotion part is moved toward the front of the vehicle body. It is formed to extend toward the inside of the vehicle body. In this suspension device, even if a large impact force is applied to the wheel at the time of a frontal collision of the vehicle, the deformation promoting portion is urged to be deformed and the vehicle body is not greatly deformed.

JP 2009-220754 A JP 2012-158200 A

  In the structure described in Patent Document 1, when the front wheel receives a collision load from the front and moves rearward, the left or right side frame side portion of the suspension member to which the front wheel support lower arm is connected projects inward in the vehicle width direction. Turn like so. Therefore, the front wheel connected to the front wheel support lower arm moves inward in the vehicle width direction while rotating around the rear side connecting portion. When the front wheel that has moved inward in the vehicle width direction receives a collision load from the front, the lower arm and the vehicle body are connected, so there are wheels that have moved through the lower arm or inward in the vehicle width direction. The collision load is transmitted by the direct collision, and the vehicle body may be deformed.

  In the structure described in Patent Document 2, when the front wheel receives a collision load from the front, the deformation promoting portion of the lower arm buckles, and the front wheel connected to the lower arm moves backward. However, since the lower arm and the vehicle body are connected, when a collision load is further applied to the front wheels from the front, the collision load is transmitted to the vehicle body via the lower arm or by the front wheel directly colliding with the vehicle body. There is a risk of deformation.

  The present invention has been made paying attention to the above technical problem, and when a collision load is applied to the wheel from the front, the collision load is transmitted to the vehicle body by quickly releasing the connection between the lower arm and the vehicle body. An object of the present invention is to provide a vehicle suspension device that suppresses the deformation of the vehicle body and reduces deformation of the vehicle body.

  In order to achieve the above object, the invention of claim 1 includes a lower arm connected to a vehicle body and supporting a wheel, and a wheel support portion of the lower arm rotatably supports the wheel. The front vehicle body connecting portion extends forward of the vehicle body and is connected to the vehicle body so as to be swingable up and down, and the vehicle rear connection portion of the lower arm extends rearward of the vehicle body and is connected to the vehicle body by a bracket so as to be swingable up and down. In the vehicle suspension apparatus, the rear connection portion of the vehicle body is formed with a plate-like protrusion in front of the bracket in the vehicle front-rear direction and facing the bracket, and a collision load is applied to the wheel from the front. When the is added, the collision load is transmitted from the projection to the bracket.

  According to a second aspect of the present invention, in the first aspect of the present invention, the protrusion is formed at a position where it collides with a portion having a low rigidity of the bracket when a collision load is applied to the wheel from the front. This is a vehicle suspension system.

  According to the present invention, the plate-like protrusion is formed in front of the bracket in the vehicle front-rear direction and opposed to the bracket, and when a collision load is applied to the wheel from the front, the protrusion extends from the protrusion to the bracket. The collision load is transmitted. When a collision load of a minute lap collision is applied to the wheel while the vehicle is traveling, the collision load is transmitted from the front of the vehicle body to the wheel support portion of the lower arm that supports the wheel. A collision load is transmitted to the vehicle body front connection portion and the vehicle body rear connection portion of the lower arm because they are integral with the wheel support portion. The vehicle body rear connection portion to which the collision load is transmitted moves to the bracket side behind the vehicle. The protrusion formed on the rear connection portion of the vehicle body collides with the bracket and transmits the load. And since the bracket which collided with the projection part is broken, the rear vehicle body connecting portion of the lower arm is separated from the vehicle body, so that the collision load can be prevented from being transmitted to the vehicle body. Therefore, when a collision load is applied to the wheel from the front, the bracket that connects the lower arm and the vehicle body can be quickly broken, and deformation of the vehicle body can be suppressed.

  Moreover, according to this invention, when the collision load is added to the wheel from the front, it is formed at a position where it collides with a portion where the rigidity of the bracket is low. Therefore, the bracket that connects the lower arm and the vehicle body can be easily broken, and deformation of the vehicle body can be suppressed.

1 is a plan view of the back of a vehicle schematically showing an example of a vehicle suspension device according to the present invention. It is an enlarged view of the II section in FIG. It is sectional drawing which follows the III-III line of the vehicle suspension apparatus in FIG.

  Next, a specific example of the vehicle suspension apparatus according to the present invention will be described. The vehicle suspension apparatus according to the present invention connects the lower arm and the vehicle body in order to prevent the collision load from being transmitted to the vehicle body via the lower arm and the vehicle body from being deformed when a collision load is applied to the wheels from the front. The bracket is configured to be broken, and the vehicle may be a front-wheel drive vehicle, a rear-wheel drive vehicle, a four-wheel drive vehicle, or the like that uses an internal combustion engine and a motor as a power source.

  As shown in FIG. 2, rectangular front side members 2 extending in the vehicle front-rear direction are disposed at the front portion of the vehicle body 1 at both ends in the vehicle width direction. A rectangular front cross member 3 extending in the vehicle width direction is disposed between the front side members 2 in the vehicle width direction, and the front cross member 3 is an end of the front side member 2 on the vehicle front side. They are connected to each other.

  Between the front side members 2 in the vehicle width direction, a front suspension member 4 formed in the shape of a square frame is disposed on the vehicle rear side of the front cross member 3, and the vehicle of the front suspension member 4 is arranged. The end portions in the width direction are fixed to the front side members 2 respectively.

  As shown in FIG. 3, the suspension device 5 is a double wishbone suspension, and includes an upper arm (not shown) and a lower arm 6, and an upper arm and a lower arm 6 that are attached to the vehicle body 1 so as to be swingable up and down. It includes a knuckle 8 that is vertically swingable and holds the wheel 7 rotatably, and a shock absorber 8 that is swingably attached to the vehicle body 1 and the lower arm 6. Further, the front wheel 7 is disposed outside the front side member 2 in the vehicle width direction, and is supported by the vehicle body 1 via the suspension device 5. The suspension device according to the present invention only needs to have a lower arm that supports the wheel rotatably and is connected to the vehicle, and may have a lower arm such as a strut type or a multi-link type.

  The lower arm 6 is formed in a substantially L shape as shown in FIG. The wheel support portion 10 of the lower arm 6 is one end portion that is substantially L-shaped, and is attached to the lower end portion of the knuckle 8 via a ball joint (not shown).

  The vehicle body front connection portion 11 of the lower arm 6 protrudes from the lower end portion of the knuckle 8 in the vehicle width direction toward the vehicle inner side, and is formed as a cylindrical tubular body 11a having the vehicle front-rear direction as an axial direction. Further, a bush provided with a support pipe (not shown) and an elastic member (not shown) disposed between the support pipe and the cylinder 11a inside the cylinder 11a of the vehicle body front connection portion 11. Is formed. The vehicle body front connection portion 11 is attached to an end portion 4a of the front side member 2 on the vehicle front side so as to be swingable up and down by a bolt 11b disposed on the swing axis.

  The vehicle body rear connection portion 12 of the lower arm 6 is the other substantially L-shaped end portion and is formed to extend rearward from the vehicle body front connection portion 11 in the vehicle front-rear direction. The vehicle body rear connection portion 12 has a columnar shape, and a spin drill 13 having an axial direction in the vehicle front-rear direction is attached to an end portion thereof. The spin drill 13 is inserted into a bush 15 press-fitted into the bracket 14. The bush 15 includes a cylindrical metal member 15a, a support pipe 15b that supports the spin drill 13, and an elastic member 15c disposed between the support pipe 15b and the cylindrical body 15a. As shown in FIG. 1, the end of the spin drill 13 is fixed to the bush 15 by a nut 16 so as to swing up and down.

  As shown in FIG. 3, the bracket 14 has a cylindrical shape, and two rectangular fixing portions 14 b and 14 c are alternately formed in parallel on the outer peripheral portion of the cylindrical portion 14 a. The one fixing portion 14b and the front suspension member 4 are fixed by a bolt 17, and the other fixing portion 14c, the front suspension member 4 and the front side member 2 are fixed by another bolt 18. That is, the vehicle body rear connection portion 12 is fixed to the end portion 4b of the front side member 2 on the vehicle rear side by the bracket 14 so as to be swingable up and down. Further, the bracket 14 is configured to be broken when a load greater than an allowable load is transmitted.

  Further, the vehicle body rear connection portion 12 according to the present invention is formed with a plate-like projection 19 in front of the bracket 14 and opposed to the bracket 14, and a collision load is applied to the wheel 7 from the front. In addition, the collision load is transmitted from the protrusion 19 to the bracket 14. As shown in FIG. 3, the protrusion 19 collides with a range θ of a portion having low rigidity in the cylindrical portion 14a of the bracket 14 (in other words, an outer peripheral portion of the cylindrical portion 14a where the fixing portions 14b and 14c are not formed). As shown, the outer periphery of the vehicle body rear connecting portion 12 is formed. In addition, the length L in the vehicle front-rear direction of the protrusion 19 adjusts the time until the collision load is transmitted from the protrusion 19 to the bracket 14 when a collision load is applied to the wheel 7 from the front. The length is set in order to transmit the collision load from the protrusion 19 to the bracket 14 within a predetermined time. Note that there may or may not be a gap between the bracket and the end of the vehicle body rear connection portion in the vehicle front-rear direction.

  Next, the operation of the suspension device according to the present invention will be described. As shown in FIG. 1, when the collision body 20 collides with a portion located on the outer side in the vehicle width direction from the front side member 2 while the vehicle is traveling (a minute lap collision) and a collision load is applied to the front wheel 7, 7 and the wheel support portion 10 of the lower arm 6 that supports the front wheel 7 are moved to the rear of the vehicle when a collision load is transmitted from the front of the vehicle body. Moreover, since the vehicle body front connection part 11 and the vehicle body rear connection part 12 of the lower arm 6 are integral with the wheel support part 10, a collision load is transmitted. The vehicle body rear connection portion 12 to which the collision load is transmitted moves to the bracket 14 side on the rear side of the vehicle. Since the lower arm 6 bends downward in the vehicle body, the protrusion 19 formed in the vehicle body rear connection portion 12 collides with a portion of the bracket 14 on the vehicle lower side where the rigidity is low, and the load is transmitted. And the bracket 14 which the protrusion part 19 collided is fractured | ruptured when the transmitted collision load is more than the allowable load. When the bracket 14 is broken, the rear vehicle body connection portion 12 of the lower arm 6 is separated from the vehicle body 1, so that a collision load can be prevented from being transmitted to the vehicle body 1. Therefore, when a collision load is applied to the wheel from the front, the connecting portion between the lower arm and the vehicle body can be quickly broken, and deformation of the vehicle body can be suppressed.

  The vehicle suspension device according to the present invention has a configuration in which when a collision load is applied to the front wheels during traveling of the vehicle, the connection between the lower arm and the vehicle body is released early to prevent the collision load from being transmitted to the vehicle body. I just need it.

  DESCRIPTION OF SYMBOLS 1 ... Car body, 5 ... Vehicle suspension apparatus, 6 ... Lower arm, 7 ... Wheel, 10 ... Wheel support part, 11 ... Car body front connection part, 12 ... Car body rear connection part, 14 ... Bracket 19 ... Projection part.

Claims (2)

A lower arm connected to the vehicle body and supporting the wheel is provided, and the wheel support portion of the lower arm rotatably supports the wheel, and the vehicle body front connection portion of the lower arm extends forward of the vehicle body and can swing up and down on the vehicle body. A vehicle suspension device configured to be coupled to the vehicle body so that the rear arm of the lower arm extends rearward of the vehicle body and is pivotally coupled to the vehicle body by a bracket.
The vehicle body rear connection portion is formed with a plate-like protrusion that is forward of the bracket in the vehicle longitudinal direction and that faces the bracket, and when a collision load is applied to the wheel from the front, A vehicle suspension device configured to transmit the collision load from a protrusion to the bracket.   The vehicle suspension device according to claim 1, wherein the projection is formed at a position where the projection collides with a portion having low rigidity of the bracket when a collision load is applied to the wheel from the front.

Images