JPH0589157U - Vehicle cross member mounting structure - Google Patents

Abstract

(57) [Summary] [Purpose] To increase the collision energy absorption effect at the front of the vehicle body during a frontal collision with a simple structure. A bracket member 22 is provided at left and right ends of the cross member main body 18 so as to project upward, and an arm member 21 having a substantially U-shaped cross section that is open forward and extends obliquely upward and forward is provided. Upper wall 22e of 22
To the second mounting bracket 15 with a pair of left and right bolt members 31.
First attachment via a positioning pin 23 and a bolt member 30 that are firmly connected to the lower wall portion 15a of the arm member 21 and that extend upwardly of the upper wall portion 21a of the arm member 21 and that are provided on the front and rear portions thereof. It was connected to the lower wall portion 14a of the bracket 14.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a cross member mounting structure for a vehicle, and more particularly to a cross member mounting structure for connecting and supporting left and right suspension devices to a vehicle body.

[0002]

[Prior Art]

 Generally, in a vehicle equipped with a strut type or a double wishbone type suspension device, a vehicle in which the left and right suspension devices are connected in order to improve the assemblability of the suspension device to the vehicle body and the strength and rigidity against lateral load. A suspension cross member oriented in the width direction is provided (see Japanese Utility Model Laid-Open No. 62-202402). For example, in a suspension cross member for a strut type or double wishbone type suspension device having an A-shaped arm, arms extending rearward are provided at both ends of the suspension cross member, and both ends of the suspension cross member are provided. Is connected to the inner end of the front arm of the A-shaped arm in the vehicle width direction, and is connected to the rear end of the arm to the inner end of the rear arm that extends in a curved shape rearward of the A-shaped arm. The suspension cross member is fixed to the vehicle body through mounting portions provided at both ends of the suspension cross member and the rear end portion of the arm portion. Further, since the suspension device is assembled to the vehicle body in a state where it is sub-assembled to the suspension cross member, a positioning pin for positioning the vehicle body is provided in the vicinity of the rear mounting portion.

In addition, for example, in a suspension cross member for a four-wheel drive vehicle, the arm portion should be extended rearward from both ends of the suspension cross member due to the requirements of the differential device and the steering rack unit in terms of layout. However, it is difficult to fix the suspension cross member to the vehicle body by extending the arm part forward and fixing it to the vehicle body. On the other hand, in order to further improve the occupant's safety by absorbing the collision energy at the time of a frontal collision, a collision energy absorbing structure is provided in the front part of the vehicle body to absorb the collision energy by the collision energy absorbing action due to the deformation. There is.

[0004]

[Problems to be solved by the device]

 By the way, when the arm portion is extended forward and fixed to the vehicle body as described above, the deformation of the vehicle body portion corresponding to the arm portion at the time of a frontal collision is hindered, and the collision energy absorbing action of the front portion of the vehicle body is reduced accordingly. There's a problem. SUMMARY OF THE INVENTION An object of the present invention is to provide a cross member mounting structure for a vehicle, which has a simple structure and can increase the collision energy absorbing action at the front part of the vehicle body in the case of a frontal collision.

[0005]

[Means for Solving the Problems]

 The cross member mounting structure for a vehicle according to claim 1 is a cross member for supporting the inner ends of the suspension arms of the left and right front suspension devices to the vehicle body, and the left and right ends are fixed to the vehicle body. In the structure for mounting the cross member, a mounting portion for the vehicle body is provided at each of both end portions of the cross member at a predetermined distance in the front-rear direction of the vehicle body, and a front portion of the mounting portion of the foremost portion of the plurality of mounting portions is The rear part is connected to the vehicle body through vertical positioning pins and vertical fixing bolt members. A vehicle crossmember mounting structure according to a second aspect is the mounting structure according to the first aspect, wherein curved arm portions extending diagonally forward and upward are formed at both ends of the crossmember, and a front end portion of the arm portion is formed. The frontmost mounting portion is provided. According to a third aspect of the present invention, there is provided a cross member attachment structure for a vehicle according to the second aspect, wherein the arm portion is formed in a substantially U-shaped cross section that opens downward and forward.

[0006]

[Action]

 In the cross member mounting structure for a vehicle according to claim 1, a plurality of mounting portions for the vehicle body are provided at respective left and right end portions of the cross member with a predetermined distance in the vehicle front-rear direction, and among the plurality of mounting portions. Since the front part and the rear part of the frontmost mounting part are connected to the vehicle body via the positioning pin in the upright position and the fixing bolt member in the upright position, respectively, the strength and rigidity of the front part of the cross member can be lowered through the positioning pin. It can be set, and the tension of the cross member at the time of a frontal collision can be reduced to increase the collision energy absorption effect due to the deformation of the vehicle body member corresponding to the cross member.

In the vehicle crossmember mounting structure according to the second aspect, curved arm portions extending diagonally forward and upward are formed at both ends of the crossmember, and the frontmost mounting portion is provided at the front end portion of the arm portion. Therefore, while ensuring sufficient mounting strength of the cross member to the vehicle body, the strength and rigidity of the vicinity of the front end of the arm part are set low to absorb the collision energy of the car body member corresponding to the arm part during a frontal collision. The action can be increased. In the cross member mounting structure for a vehicle according to claim 3, since the arm portion is formed in a substantially U-shaped cross section that opens downward and forward, the strength and rigidity of the arm portion are set to be low. It is possible to prevent the crushed residue of the vehicle body member corresponding to the arm portion at the time of a frontal collision, and to further increase the collision energy absorbing action of the vehicle body front portion.

[0008]

[Effect of the device]

 As described in the section of the action, the following effects can be obtained. According to the cross member mounting structure for a vehicle according to claim 1, the front part and the rear part of the frontmost mounting part of the plurality of mounting parts provided on the cross member are respectively positioned upright and vertically. Since it is connected to the vehicle body via a fixing bolt member, the strength and rigidity of the front of the cross member can be set low through the position pin, and the amount of cross member slamming during a frontal collision can be reduced accordingly. It is possible to increase the collision energy absorbing action due to the deformation of the vehicle body member corresponding to.

According to the vehicle crossmember mounting structure of the second aspect, curved arm portions extending obliquely forward and upward are formed at both end portions of the crossmember, and the frontmost mounting portion is provided at the front end portion of the arm portion. Is provided, the strength and rigidity of the vicinity of the front end of the arm portion can be set to be low, and the deformation of the vehicle body member corresponding to the arm portion at the time of a frontal collision can be promoted. In the vehicle cross-member mounting structure according to claim 3, since the arm portion is formed in a substantially U-shaped cross section that opens downward and forward, the strength of the arm portion against the load in the front-rear direction is By setting the rigidity to a relatively low level, it is possible to prevent uncrushed parts of the vehicle body member corresponding to the arm portion at the time of a frontal collision, and to further increase the collision energy absorbing action at the front part of the vehicle body.

[0010]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. The present embodiment is a case where the present invention is applied to a cross member mounting structure of a vehicle equipped with a strut type front suspension device, and description will be made by defining front, rear, left and right with reference to front, rear, left and right of the vehicle. As shown in FIG. 1, the automobile 1 is a four-wheel drive vehicle, and the output of the engine 2 is changed through a manual transmission 3 and then distributed through a transfer device 4 to front and rear differential devices 5 and 6. , Are transmitted from the differential devices 5 and 6 to the front and rear wheels 7 and 8, respectively. Since the configuration of the transmission 3, the transfer device 4, and the front and rear differential devices 5 and 6 are general, detailed description thereof will be omitted.

In order to support the left and right front suspension devices 10 of the vehicle 1, a suspension cross member 17 is provided at the front of the vehicle 1. The suspension cross member 17 has the following structure. It is fixed to the vehicle through the mounting structure. The cross member mounting structure will be described. As shown in FIGS. 2 to 4, a pair of left and right front side frames 13 extending in the front-rear direction is provided at the front part of the vehicle body of the automobile 1, and the left and right front side frames 13 are provided. First to third vehicle body side mounting brackets 14 to 16 are provided in the middle of the vehicle in order from the front side at appropriate intervals, and these three mounting brackets 14 to 16 are configured in a substantially similar shape to form a front side frame. It is provided so as to project downward from 13 and is set so that the mounting bracket 16 closer to the vehicle compartment and the rear mounting bracket 16 are larger and have higher strength and rigidity. It is fixed to the left and right front side frames 13 in the vehicle width direction via the first and second mounting brackets 14 and 15.

As shown in FIGS. 2 to 8, the suspension cross member 17 includes a cross member main body 18 having a closed cross-section extending in the vehicle width direction, and a projection upward from both ends of the cross member main body 18. A pair of left and right bracket members 22 that extend and are fixed to the second mounting bracket 15; and a pair of left and right arm members 21 that extend from the bracket member 22 forward and obliquely upward and are fixed to the first mounting bracket 14. The straight member of the cross member main body 18 is disposed in a substantially horizontal direction by passing through the front side of the lower part of the differential device 5 on the front side. A curved curved portion 18a is formed, and the left and right ends of the cross member main body 18 are configured so that their lower surfaces are open and arranged below the second mounting bracket 15. A pair of front and rear slanted wall portions 18b are formed at the upper left and right upper ends of the left and right ends of the cross member main body 18 so as to expand downward.

The left and right bracket members 22 are a pair of front and rear reinforcing portions 22a fixed to the front wall portion and the upper wall portion of the cross member main body 18, and are inclined upward from the upper ends of the front and rear reinforcing portions 22a. A pair of front and rear inclined portions 22b extending and fixed to the front and rear inclined wall portions 18b, a flange portion 22c fixed to the upper wall portion of the cross member body 18, and upper and lower portions of the front and rear inclined portion 22b. 22c is integrally formed with a fixed portion 22d having a U-shaped cross section, which extends upward from the outer end portion of 22c and is fixed to the lower wall portion 15a of the second mounting bracket 15, and the upper wall portion of the fixed portion 22d. 22e is formed with a pair of left and right bolt holes 27 that are elongated in the front-rear direction, and a nut member 28 is formed on the lower wall portion 15a of the second mounting bracket 15 so as to correspond to the rear end portion of the bolt hole 27. Fixed and fixed part 2 The outer end of 2d is opened, and a working space 29 for bolt fastening is formed in the fixed portion 22d.

The left and right arm members 21 are formed in a generally U-shaped cross section that opens forward and downward, and the base end of the arm member 21 is fixed to the front reinforcement portion 22 a, and the front end of the arm member 21 is fixed. An upper wall portion 21a fixed to the first mounting bracket 14 is formed in the portion, and a positioning pin 23 is provided in a front portion of the upper wall portion 21a so as to project upward, and a positioning pin 23 is provided in a rear portion of the upper wall portion 21a. Is formed with a bolt insertion hole 24, and a positioning hole 25 through which the positioning pin 23 is inserted is provided in the front portion of the lower wall portion 14a of the first mounting bracket 14 and corresponds to the bolt insertion hole 24 of the lower wall portion 14a. A nut member 26 is fixed at the position, the suspension cross member 17 is positioned on the vehicle body through a positioning pin 23, and is fastened to the nut member 26 of the first mounting bracket 14 from below. The bolt members 30 and the left and right nut members 28 of the second mounting bracket 15 are fixed to the left and right front side frames 13 via a pair of bolt members 31 that are fastened from below.

As shown in FIGS. 2 to 4, the left and right front suspension devices 10 of the automobile 1 have a general structure including a shock absorber 35, a coil spring (not shown), and an A-type arm 36. This strut type suspension device is connected to and supported by the vehicle body as follows. The outer end of the A-arm 36 of the suspension device 10 is swingably connected to the wheel support 34 via a ball joint 37, and the front arm 36a of the front of the A-arm 36 extends in the vehicle width direction. The inner end portions are inserted into both end portions of the cross member main body 18, and the front and rear wall portions of the cross member main body 18 and the shaft member 38 pivotally supported by the reinforcing portion 22a and the rubber bush 39 are provided between the cross member main body 18. A shaft portion 40, which is rotatably connected to the main body 18 and extends rearward, is formed at an inner end portion of a rear arm portion 36b of a rear side of the A-shaped arm 36, and the rear arm portion 36b is externally attached to the shaft portion 40. It is rotatably connected to and supported by the third mounting bracket 16 via the fitted rubber bush (not shown), the outer cylinder 41, and the fixing member 42, and the upper end of the shock absorber 35 is not shown. Is fixed to the upper wall portion of the suspension tower, the third attachment bracket 16 is disposed on the lower side of the vertical wall portion of the dash panel 43.

Next, the mounting structure of the steering rack unit 45 arranged in the left-right direction above and slightly forward of the suspension cross member 17 will be described with reference to FIGS. 2 to 6, 8 and 9. As described above, the portions near both ends of the steering rack unit 45 are fixed to the suspension cross member 17 via the pair of left and right mount brackets 46 and the fixing brackets 44, and the curved portion 18a is attached to the outer mounting portion of the mount bracket 46. A reinforced portion 46a having a substantially U-shaped cross section extending upward is formed, and a tie rod 47 extending from the steering rack unit 45 to the left and right sides is connected to the wheel support 34 through the front side of the second mounting bracket 15. 2 The front end surface of the mounting bracket 15 is formed with an inclined surface 15b that recedes toward the lower end side. The surface 15b is located higher than the tie rod 47 and rearward, and is arranged so as to wrap a predetermined distance up and down. The steering force of the steering handle 50 (see FIG. 1) is generated by the steering shaft 51, the intermediate shaft 52, and the universal joint 53. It is transmitted to the input shaft 54 provided in the steering rack unit 45 via the above.

Next, the mounting structure of the differential device 5 will be described. As shown in FIGS. 2 to 5, the differential device 5 is disposed on the rear side of the right portion of the suspension cross member 17 and is located on the right and left sides of the differential device 5. The side gear shaft 55 extending to both sides is connected to the front wheel 7 via a universal joint 55a, an axle 55b, a universal joint 55c, an axle hub 55d, etc., and the universal joint 55a is arranged on the front side of the bracket member 22 and has an axial center of the axle 55b. Is disposed slightly forward of the center of the A-shaped arm 36 in the front-rear direction, and a diff cross member 56 extending in the vehicle width direction is provided at a position corresponding to the third mounting bracket 16, and the diff cross member 56 is 3 It is fixed over the mounting bracket 16 and the lower wall of the front side frame 13. The right portion of the differential cross member 56 is formed in a curved shape so as to pass below the input shaft tube 57 of the differential device 5, and the right curved portion 18a of the suspension cross member 17 is formed at the front end portion of the casing 5a of the differential device 5. A support member 58 extending upward is provided. The support member 58 is elastically supported by the suspension cross member 17 via a mounting device 59 provided on the curved portion 18a, and the left end of an axle tube 60 extending to the left side of the differential device 5. A support member 61 extending forward is provided in the vicinity of the support member 61. The support member 61 is elastically supported by the suspension cross member 17 via a mount device 62 provided on the left curved portion 18a, and at the rear portion of the casing 5a. A support member 61 extending rearward is provided, and a rear end portion of the support member 61 has a diff cross member. It is elastically supported on Defukurosumen bar 56 through the mounting device 64 provided on over 56.

The mounting structure of the mounting devices 59 and 62 provided on the left and right curved portions 18a will be described. Since the mounting structures of the mounting devices 59 and 62 are substantially bilaterally symmetrical, the mounting structure of the left mounting device 59 will be described with reference to FIG. As shown in FIG. 7, a vertically oriented tubular portion 65 extending downward is integrally formed on the upper wall portion of the curved portion 18a, and an opening 66 is provided on the upper wall portion of the reinforcing portion 46a corresponding to the tubular portion 65. An outer cylinder 67 having a substantially circular cylindrical shape is fixed to the inside of the cylindrical portion 65 and the opening 66 so as to be fitted therein, and a flange portion 67a for preventing slipping is formed at an upper end portion of the outer cylinder 67. A substantially cylindrical inner cylinder 68 is provided in the cylinder 67 concentrically with the outer cylinder 67 via a rubber bush 69, and a buffer portion 69a extending above the flange portion 67a is formed at the upper end of the rubber bush 69. The inner cylinder 6 on both the upper and lower sides of the inner cylinder 68. There are provided substantially circular disc-shaped regulating plates 70 and 71 for regulating the vertical movement of 8 and the front end portion of the supporting member 63 is disposed on the regulating plate 70 and the upper and lower portions of the supporting member 61 are regulated. The plates 70 and 71 are fixed to the inner cylinder 68 via vertical bolt members 72 that pass through the inner cylinder 68, and a reinforcing member 73 having a substantially L-shaped cross section is provided at the lower end of the inner cylinder 68. The reinforcing member 73, the tubular portion 68, and the upper wall portion of the bending portion 18a form a reinforcing structure 74 having a closed cross-sectional shape. Since the mounting structure of the mounting device 64 is the same as the mounting structure of the mounting device 59 except for the reinforcing portion 46a, detailed description thereof will be omitted.

Next, the operation of the cross member mounting structure will be described. When the vehicle 1 has a frontal collision, the front side frame 13 and the vehicle body side members in the vicinity thereof are crushed in order from the front side to absorb the collision energy. Therefore, in order to efficiently absorb the collision energy at the time of the frontal collision, -It is desirable to prevent the suspension cross member 17 and the A-shaped arm 36, which have high rigidity, from being stretched to prevent uncrushed parts of the vehicle body side member.

The arm member 21 of the suspension cross member 17 is formed in a U-shaped cross section that opens forward and downward, and is set to have relatively low strength / rigidity against a rearward load. It is possible to prevent uncrushed parts of the vehicle body side member corresponding to the arm member 21 due to the arm member 21 being stretched during a frontal collision. A positioning pin 23 is provided near the front end of the arm member 21, and the arm member 21 is fixed to the first mounting bracket 14 via a bolt member 30 provided behind the positioning pin 23. It is possible to set the coupling strength of the portion near the front end of 21 to the first mounting bracket 14 low, and to reduce the amount of tension of the arm member 21 at the time of a frontal collision.

Since the bracket member 22 of the suspension cross member 17 is fixed to the second mounting bracket 15 via the bolt member 31 which is inserted through the elongated hole hole 27, a large rear load is applied. When acting on the suspension cross member 17, the bolt member 31 fastened to the nut member 28 of the second bracket 15 relatively moves forward along the bolt hole 27, and the bolt member 31 moves at the front end portion of the bolt hole 27. The impact load when locked causes the breakage of the front end of the bolt member 31 or the bolt hole 27 to be promoted. Therefore, when a large rearward load acts on the suspension cross member 17 during a frontal collision, the bracket member 22 is separated from the second mounting bracket 15 together with the front arm portion 36a of the A-type arm 36, and the A-type arm is released. The uncrushed portion of the vehicle body side member corresponding to the A-shaped arm 36 due to the stretching of 36 is prevented.

The bracket member 22 is firmly coupled to the second mounting bracket 15 via the two bolt members 31, and the bracket member 22 is directed downward of the cross member body 18 via the inclined portion 22b. Since it is fixed to the pair of front and rear inclined wall portions 18b that expands, the attachment strength of the sustain cross member 17 against the vertical load acting on the front arm portion 36 can be sufficiently secured. Further, since the front and rear reinforcing portions 22a of the bracket member 22 are fixed to the front and rear walls of the cross member body 18, the mounting strength of the bracket member 22 to the cross member body 18 can be improved and the front of the suspension device can be improved. It is possible to improve the attachment strength of the inner end of the arm portion to the cross member body 18. The mounting brackets 14 to 16 are set to have higher strength and rigidity toward the rear side, and the dash panel 43 is arranged above the third mounting bracket 16 having the highest strength and rigidity. It is possible to effectively prevent the dash panel 43 from being deformed toward the passenger compartment.

Since the second mounting bracket 15 is located higher than the tie rod 47 and rearward and wraps the tie rod 47 up and down by a predetermined distance, the suspension cross member separated from the first mounting bracket 15 is provided. The downward movement of the steering wheel 17 is promoted, and the steering rack unit 45 is released downward at the time of a frontal collision, so that the steering wheel 50 is retracted without complicating the steering force transmission system from the steering wheel 50 to the steering rack unit 45. Prevent movement. Further, since the front end surface of the second mounting bracket 15 is formed with the inclined surface 15b that recedes toward the lower end, the downward movement of the suspension cross member 17 separated from the second mounting bracket 15 is further promoted. The backward movement of the steering wheel 50 can be prevented more reliably. Further, since the cross member main body 18 is fixed to the first mounting bracket 14 via the arm member 21 inclined forward and upward, the cross member main body 18 is subjected to the rearward load acting on the arm member 21 at the time of a frontal collision, so that the cross member is closed. Since the main body 18 is rotated in the direction shown by the arrow in FIG. 6, the downward movement of the steering rack unit 45 is promoted, and the backward movement of the steering handle 50 can be prevented more effectively.

Since the reinforcing portion 46a of the mount bracket 46 is extended above the bending portion 18a, the strength and rigidity of the bending portion 18a can be increased without increasing the number of parts. Moreover, since the mounting devices 59 and 62 of the differential device 5 are provided in the portion reinforced by the reinforcing portion 46a, the mounting strength of the mounting devices 59 and 62 can be improved.

Instead of the elongated bolt hole 27, as shown in FIG. 10, a notch having one end open in the front-rear direction of the vehicle body is formed in the upper wall portion 22e of the left and right bracket members 22A. One pair of left and right bolt holes 27A may be provided respectively. Note that, as shown in FIG. 11, the rear end portion of the arm member 21B may be detachably fixed to the cross member main body 18 and the bracket member 22 with a plurality of bolts 80. In this case, the steering rack unit 45 can be removed without removing the entire suspension cross member 17, and the serviceability of the steering rack unit 45 can be improved. Although the present invention is applied to a four-wheel drive vehicle in the present embodiment, the present invention can be similarly applied to a vehicle of a rear drive system or a front drive system. Further, although the present invention is applied to the vehicle having the strut suspension device 10, the present invention can be similarly applied to the vehicle having the double wishbone suspension device.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a drive system of an automobile.

FIG. 2 is a plan view of a front portion of a vehicle body.

FIG. 3 is a front view of a front portion of a vehicle body.

4 is a sectional view taken along line 4-4 of FIG.

FIG. 5 is a plan view of a suspension cross member.

6 is a sectional view taken along line 6-6 of FIG.

7 is a sectional view taken along line 7-7 of FIG.

8 is a sectional view taken along line 8-8 of FIG.

9 is a sectional view taken along line 9-9 of FIG.

10 is a view corresponding to FIG. 7 of an arm member and a bracket member according to a modified example.

11 is a view corresponding to FIG. 7 of an arm member and a bracket member according to a modified example.

[Explanation of symbols]

 10 Suspension Device 14 First Mounting Bracket 15 Second Mounting Bracket 17 Suspension Cross Member 21 Arm Member 21a Upper Wall Part 23 Positioning Pin 30 Bolt Member 36 A-type Arm

Claims (3)

[Scope of utility model registration request] 1. A cross member for supporting the inner ends of suspension arms of left and right front suspension devices on a vehicle body, wherein the left and right ends of the cross member are fixed to the vehicle body. A plurality of mounting parts for the vehicle body are provided at each of the both end portions with a predetermined distance in the vehicle front-rear direction. A cross member mounting structure for a vehicle, characterized in that it is connected to a vehicle body through a fixing bolt member. 2. A curved arm portion extending diagonally upward and forward is formed at both ends of the cross member, and a frontmost attachment portion is provided at a front end portion of the arm portion. Vehicle cross member mounting structure. 3. The cross member mounting structure for a vehicle according to claim 2, wherein the arm portion is formed in a substantially U-shaped cross section that opens downward and forward.