JP2017178244A - Reinforcement structure for vehicular suspension bracket - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reinforcement structure for a vehicular suspension bracket, which can acquire a higher reinforcement effect while retaining a collision safety.SOLUTION: Provided is a reinforcement structure for a pair of vehicular suspension brackets 1 which are individually mounted on side frames 4 and support the tips 51 of a trailing arm 5 rotatably. Each suspension bracket 1 comprises: a pair of side plates 11 fixed on the side frames 4; a connecting plate 12 connecting the pair of side plates 11 to each other; a pair of stiffener side parts 21 fixed on the pair of side plates 11; and a stiffener 2 having a stiffener connection part 22 containing a portion positioned at a vehicular upper portion UP than the tip 51 of the railing arm 5, and connecting the pair of stiffener side parts 21 to each other. Each suspension bracket 1 is arranged in a vehicular width direction CW, and the two ends are individually connected to each other by a connecting brace 3 fastened together with the connecting plate 12 and the stiffener connection part 22 by a fastening member 32.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a bracket reinforcing structure that supports a vehicle rear suspension.

  The trailing arm (or lower control arm) connected to the rear suspension of the vehicle has a side frame (rear side member) that has a closed cross-section structure and high rigidity, with a tip portion located in front of the vehicle being a part of the vehicle body. ) Is supported by a suspension bracket fixed to Since the trailing arm supported by the suspension bracket receives a driving / braking / torque reaction force in the vehicle front-rear direction transmitted from the rear suspension, these reaction forces act on the suspension bracket.

  Here, in the side frame to which the suspension bracket is fixed, the height of the member positioned in the rear of the vehicle is set higher than the height of the member positioned in the front of the vehicle due to the influence of the arrangement of the rear tire. The portion of the side frame where the suspension bracket is fixed is located near the portion where the height of the side frame member changes. The conventional side frame has a shape in which the suspension bracket is fixed to a member positioned in front of the vehicle, the side frame bends at a position behind the vehicle from the position where the suspension bracket is fixed, and the height of the member changes suddenly. there were. In the section where the side frame bends, there is a concern that the collision safety is reduced because the impact force due to the vehicle collision is concentrated.

  Therefore, in order to ensure the collision safety, a side frame in which the height of the member is gradually changed has been adopted instead of the curved section being a smooth curved section. In this case, due to restrictions on the arrangement of the trailing arm, the suspension bracket is fixed to the curved section, and the suspension bracket hangs downward longer than the conventional vehicle. For this reason, the distance from the lower end of the highly rigid side frame to the center of rotation of the trailing arm becomes longer, and if the distance becomes longer, the rigidity of the suspension bracket, especially in the vehicle width direction, decreases, which affects driving stability. Is concerned.

  Therefore, as a conventional technique of a reinforcing structure that improves the rigidity of the suspension bracket, for example, a reinforcing structure of a vehicle suspension bracket as disclosed in Patent Document 1 can be cited. The reinforcing structure includes a first support rod for connecting the connection plate and the side frame to each other in the vehicle width direction after the suspension bracket is integrated by a connection plate for connecting the pair of side plates constituting the suspension bracket to each other. And a second support rod that connects the side plate located to the cross member connected to the side frame. While the rigidity of the suspension bracket is improved by the connecting plate, the reaction force acting on the suspension bracket is dispersed in the vehicle body by the first support rod and the second support rod. However, in this reinforcing structure, since the distance from the lower end of the side frame to the center of rotation of the trailing arm does not change, it cannot be said that the rigidity of the suspension bracket is sufficiently improved. In this structure, since the balance of reaction forces acting on the side frames located on the left and right sides in the vehicle width direction from each suspension bracket is biased, this is a concern as an obstacle to running stability.

JP 2000-313361 A

  In view of the above circumstances, an object of the present invention is to provide a reinforcing structure for a vehicle suspension bracket capable of obtaining a higher reinforcing effect while ensuring collision safety.

  The vehicle suspension bracket reinforcement structure provided by the present invention is provided on the left and right side frames in the vehicle width direction, and a pair of suspension bracket reinforcement structures that rotatably support the leading end of the trailing arm. Each of the suspension brackets is a pair of side plates that hang downward from the vehicle and is fixed to the side frame, a connecting plate that connects the pair of side plates to each other, and a pair that is fixed to the pair of side plates. And a stiffener connecting portion for connecting the pair of stiffener side portions to each other, and a side portion of the stiffener side of the trailing arm. A stiffener disposed between a pair of side plates, each suspension bracket is disposed in the vehicle width direction, and each of both ends It is characterized by being connected to each other by the connecting plates and connecting brace to be fastened by the fastening member together with the stiffener connection.

  Each suspension bracket, which is an object of a vehicle suspension bracket reinforcement structure according to the present invention, includes a pair of side plates, a connecting plate, and a stiffener. The stiffener has a pair of stiffener side portions fixed to the pair of side plates and a stiffener connecting portion that connects the pair of stiffener side portions to each other. A part of the stiffener connecting portion is located above the tip of the trailing arm. By adopting such a configuration, a highly rigid region having a closed cross-sectional structure is formed in each suspension bracket by the connecting plate, the stiffener connecting portion, and the side frame. As a result, the distance from the lower end of the high-rigidity region to the center of rotation of the trailing arm is shorter than that of the conventional technology, so the rigidity of each suspension bracket fixed to the side frame that ensures collision safety is further increased than that of the conventional technology. Can be improved.

  Moreover, each suspension bracket is arrange | positioned in the vehicle width direction, and each of both ends are mutually connected by the connection brace fastened by a fastening member with a connection board and a stiffener connection part. By adopting such a configuration, the reaction force acting on each suspension bracket is shared with each other via the connecting brace, so the bias of the reaction force acting on each side frame from the suspension bracket is reduced, and the running stability is reduced. Will improve. As described above, according to the reinforcing structure for a suspension bracket for a vehicle according to the present invention, it is possible to obtain a higher reinforcing effect of the suspension bracket while ensuring collision safety.

  Other features and advantages of the present invention will become more apparent from the detailed description given below with reference to the accompanying drawings.

It is a top view of the reinforcement structure of the suspension bracket for vehicles concerning the present invention. It is a side view of the reinforcement structure of the suspension bracket for vehicles shown in FIG. It is sectional drawing which follows the III-III line of FIG. It is sectional drawing which follows the IV-IV line of FIG. It is a rear view of the reinforcement structure of the suspension bracket for vehicles shown in FIG.

  A mode for carrying out the present invention (hereinafter referred to as “embodiment”) will be described with reference to the accompanying drawings.

  Based on FIGS. 1-5, embodiment of the reinforcement structure of the suspension bracket for vehicles concerning this invention is described. The present reinforcing structure is a steel member that constitutes a part of the vehicle body, and a pair of suspension brackets 1 that are provided on the side frames 4 that are located on both the left and right sides in the vehicle width direction CW are intended for reinforcement.

  FIG. 1 is a plan view of a reinforcing structure of a vehicle suspension bracket according to the present invention. 2 is a side view of the reinforcing structure of the vehicle suspension bracket shown in FIG. 1, and is a view when viewed from the inside to the outside of the vehicle body. 3 is a cross-sectional view taken along line III-III in FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. FIG. 5 is a rear view of the reinforcing structure of the vehicle suspension bracket shown in FIG. 1 to 5, FR indicates the front of the vehicle, RE indicates the rear of the vehicle, UP indicates the upper side of the vehicle, DW indicates the lower side of the vehicle, and CW indicates the vehicle width direction.

  As shown in FIG. 1, the pair of suspension brackets 1 are steel members provided on the side frames 4 located on the left and right sides in the vehicle width direction CW. As shown in FIGS. 2 to 4, each suspension bracket 1 supports a front end portion 51 of a trailing arm 5 connected to a rear suspension (not shown) so as to be rotatable in a vertical plane. The front end portion 51 is an annular portion formed in the vehicle front FR of the trailing arm 5. The suspension bracket 1 includes a pair of side plates 11, a connecting plate 12, and a stiffener 2.

  As shown in FIGS. 2 to 4, the pair of side plates 11 hang down the vehicle lower side DW and are arranged on both sides of the side frame 4 in the vehicle width direction CW, and are welded to the side frame 4 by welding in the vehicle upper direction UP. It is a fixed part. The side frame 4 is sandwiched between the pair of side plates 11. 2 and 4, a support hole 111 is formed in the vehicle rear RE of the side plate 11, and a support shaft 52 such as a steel rod communicates with the pair of support holes 111 along the vehicle width direction CW. Yes. Further, as shown in FIGS. 3 and 4, the connecting plate 12 is a portion that connects the pair of side plates 11 to each other in the vehicle lower side DW. In the connecting plate 12, the connecting plate front end 121 located at the vehicle front FR is fixed to the side frame 4 by welding. A bracket insertion hole 122 is formed in the connecting plate 12.

  As shown in FIGS. 2 to 4, the stiffener 2 is a steel member disposed between the pair of side plates 11 and fixed to the pair of side plates 11. The stiffener 2 is a reinforcing member for the suspension bracket 1. The stiffener 2 has a pair of stiffener side portions 21 and a stiffener connecting portion 22. As shown in FIG. 4, the cross-sectional shape of the stiffener 2 along the vehicle width direction CW is U-shaped.

  As shown in FIGS. 2 to 4, the pair of stiffener side portions 21 are disposed between the pair of side plates 11 similarly to the side frame 4, and are fixed to the side plates 11 by welding. This is the part. In the stiffener side portion 21, the side rear end 212 located at the vehicle rear RE is fixed to the side frame 4 by welding. As shown in FIGS. 3 and 4, the stiffener connecting portion 22 is a portion that connects the pair of stiffener side portions 21 to each other in the vehicle lower side DW. The stiffener connecting portion 22 includes a portion located on the vehicle upper side with respect to the front end portion 51 of the trailing arm 5. In the stiffener connecting portion 22, the connecting portion front end 221 located at the vehicle front FR is located above the connecting plate 12 and in contact with the connecting plate 12. A stiffener insertion hole 221a is formed at the front end 221 of the connecting portion. The center and diameter of the stiffener insertion hole 221a are the same as the bracket insertion hole 122. In the stiffener connecting portion 22, the connecting portion rear end 222 located at the vehicle rear RE is fixed to the side frame 4 by welding similarly to the connecting plate front end 121 of the connecting plate 12.

  As shown in FIGS. 1 to 3 and 5, the connecting brace 3 is disposed along the vehicle width direction CW, and each of the connecting portions 31 at both ends is connected to the connecting plate 12 and the stiffener connecting portion 22. The steel member is fastened by the fastening member 32. The suspension brackets 1 are connected to each other by a connection brace 3. The connection brace 3 according to the present embodiment is made of a steel pipe, and a flat connection part 31 is formed by crushing both ends thereof. As shown in FIG. 3, a brace insertion hole 311 is formed in the connecting portion 31, and the center and diameter of the brace insertion hole 311 are the same as the bracket insertion hole 122 and the stiffener insertion hole 221a. Further, as shown in FIG. 3, the connecting portion 31 is in contact with the connecting plate 12 from the vehicle lower side DW so that the center C of the brace insertion hole 311 is the same as the center C of the stiffener insertion hole 221a. . In this state, the fastening member 32 such as a bolt and nut communicates with the stiffener insertion hole 221a, the bracket insertion hole 122, and the brace insertion hole 311. It is fastened by the fastening member 32 together with the rigid material connecting portion 22.

  The trailing arm 5 is supported by a pair of side plates 11 of the suspension bracket 1 as shown in FIGS. The trailing arm 5 is supported by the suspension bracket 1 so as to be rotatable in a vertical plane when the support shaft 52 is inserted through the center of the tip 51. A spacer 511 that covers the support shaft 52 and a bush 512 that covers the spacer 511 are interposed between the distal end portion 51 and the support shaft 52 in the circumferential direction. The bush 512 is made of synthetic rubber, for example. The bush 512 suppresses the vibration generated in the trailing arm 5 from being transmitted to the side frame 4.

  Next, the effect of the reinforcing structure for a vehicle suspension bracket according to the present invention will be described.

  Each suspension bracket 1, which is a target of a vehicle suspension bracket reinforcement structure according to the present invention, includes a pair of side plates 11, a connecting plate 12, and a stiffener 2. The stiffener 2 has a pair of stiffener side portions 21 fixed to the pair of side plates 11 and a stiffener connecting portion 22 that connects the pair of stiffener side portions 21 to each other. A part of the stiffener connecting portion 22 is positioned above the vehicle upper UP with respect to the front end portion 51 of the trailing arm 5. By adopting such a configuration, a highly rigid region having a closed cross-sectional structure is formed in each suspension bracket 1 by the connecting plate 12, the stiffener connecting portion 22, and the side frame 4. Therefore, as shown in FIG. 3, the distance from the lower end of the high-rigidity region to the rotation center of the trailing arm 5 is the distance D in the prior art, whereas the distance d is provided in the reinforcing structure according to the present invention. Shorter than. Therefore, the rigidity of each suspension bracket 1 fixed to the side frame 4 that ensures the collision safety can be further improved as compared with the prior art.

  Each suspension bracket 1 is arranged in the vehicle width direction CW, and each of the connecting portions 31 at both ends is connected to each other by a connecting brace 3 fastened by a fastening member 32 together with the connecting plate 12 and the stiffener connecting portion 22. It is connected to. By adopting such a configuration, reaction forces acting on the suspension brackets 1 are shared with each other via the connecting braces 3, so that the bias of reaction forces acting on the side frames 4 from the suspension brackets 1 is reduced. , Running stability is improved. As mentioned above, according to the reinforcement structure of the suspension bracket for vehicles concerning this invention, it becomes possible to acquire the reinforcement effect of each suspension bracket 1 higher, ensuring collision safety.

  The present invention is not limited to the embodiment described above. The specific configuration of each part of the present invention can be changed in various ways.

1: Suspension bracket 11: Side plate 111: Support hole 12: Connection plate 121: Connection plate front end 122: Bracket insertion hole 2: Stiffener 21: Stiffener side 212: Side rear end 22: Stiffener connection Portion 221: Connecting portion front end 221a: Stiffener insertion hole 222: Connecting portion rear end 3: Connection brace 31: Connection portion 311: Brace insertion hole 32: Fastening member 4: Side frame 5: Trailing arm 51: Tip portion 511: Spacer 512: Bush 52: Support shaft FR: Vehicle front RE: Vehicle rear UP: Vehicle upper DW: Vehicle lower CW: Vehicle width direction C: Center D, d: Distance

Claims (1)

A reinforcement structure for a pair of suspension brackets provided on the side frames located on the left and right sides in the vehicle width direction, respectively, for rotatably supporting the tip of the trailing arm,
Each suspension bracket is
A pair of side plates hanging below the vehicle and fixed to the side frame;
A connecting plate for connecting the pair of side plates to each other;
A stiffener that includes a pair of stiffener side portions fixed to the pair of side plates and a portion located above the leading end of the trailing arm and that connects the pair of stiffener side portions to each other. A stiffener having a material connecting portion and disposed between the pair of side plates,
The suspension brackets are arranged in the vehicle width direction, and both ends thereof are connected to each other by a connection brace that is fastened by a fastening member together with the connection plate and the stiffener connection part. , Reinforcement structure of suspension bracket for vehicles.

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