JP2012081892A - Rear suspension for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rear suspension for vehicles, in which trailing arms and a rear axle bracket are simply and accurately positioned, and both are easily assembled with sufficient workability.SOLUTION: The rear suspension 1 for vehicles is configured so that two points of front and back of the respective rear end of right and left trailing arms 3 are respectively attached to the rear axle bracket 6 through mount bushings 5. In the rear suspension 1 for vehicles, a contact section 6d is formed in the rear axle bracket 6 in a state that any one of the respective rear end of the trailing arm 3 is temporarily locked to the rear axle bracket 6 by a bolt 26 inserted into an inner cylinder of one mount bushing 5, wherein the contact section 6d is configured so that when the trailing arms 3 and the rear axle bracket 6 are relatively rotated with the bolt 26 as the center, by being made to come into contact with an inner cylinder 5a of the other mount bushing 5, a bolt insertion hole of the inner cylinder 5a and the bolt insertion hole of the rear axle bracket 6 are matched each other and thereby both of them are positioned.

Description

  The present invention relates to a trailing arm type vehicle rear suspension.

  Such a trailing arm type vehicle rear suspension has two front and rear rear ends of a pair of left and right trailing arms whose front ends are supported so as to be pivotable up and down. Each of the rear axle brackets is configured to be attached via a mount bush (for example, Patent Document 1). Here, the mount bush is constituted by an inner cylinder, an outer cylinder, and an elastic body provided therebetween, and is press-fitted into a circular hole formed in the trailing arm.

  Thus, two circular holes are formed in the front and rear of the rear end of each pair of left and right trailing arms. The front and rear mounting bushes are press-fitted into these circular holes, respectively, and the inner cylinder bolt of each mounting bush Two bolts that are inserted into the insertion holes and the bolt insertion holes formed in the rear axle brackets and nuts that are screwed to the bolts are attached to the rear axle brackets at the front and rear ends of the trailing arms via the mounting bushes.

JP 2009-096320 A

  By the way, the rear end portions of the pair of left and right trailing arms are attached to the rear axle bracket by bolts that are inserted into the inner cylinder of the mounting bush at two places on the left and right, respectively. It is difficult to simultaneously position the bolt insertion hole of the inner cylinder of the mount bush and the bolt insertion hole of the rear axle bracket. For example, even if the trailing arm and the rear axle bracket are temporarily fixed by passing a bolt through one of the two front and rear positions of the trailing end of each trailing arm, the trailing arm rotates around the bolt. For this reason, the hole position cannot be adjusted for the other one place only by this temporary fixing, and the work for adjusting the hole position for the other one place is required. For this reason, there existed a problem that assembly | working workability | operativity was bad and the assembly | attachment took much time and effort.

  SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and the object of the present invention is to provide a vehicle rear suspension capable of easily and accurately positioning a trailing arm and a rear axle bracket and assembling them with good workability. Is to provide.

  In order to achieve the above object, the invention according to claim 1 is characterized in that the front and rear ends of each of the pair of left and right trailing arms that are supported so as to be pivotable up and down are divided into an inner cylinder and an outer cylinder. A rear suspension for a vehicle that is attached to a rear axle bracket that is attached to both left and right ends of a rear axle via a mount bush constituted by an elastic body provided between the rear end portions of the trailing arm. When one of these trailing arms and the rear axle bracket are rotated relative to each other with the bolts inserted into the inner cylinder of one mount bush being temporarily fixed to the rear axle bracket, The bolt insertion hole of the inner cylinder and the bolt insertion hole of the rear axle bracket. Itasa was characterized by an abutment formed on the rear axle bracket for positioning them together.

  According to a second aspect of the present invention, in the first aspect of the invention, a small diameter portion having a thin coating of an elastic member is formed on an outer periphery of an axial end portion of the inner cylinder of the other mount bush, and the rear axle is formed on the small diameter portion A contact portion formed on the bracket is brought into contact.

  According to a third aspect of the present invention, in the first or second aspect of the invention, the abutment portion is formed by pressing a part of the outer surface of the mounting portion of the rear axle bracket from the outside to raise a portion of the inner surface of the mounting portion. Is formed.

  The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein the rear axle bracket is configured by a channel member having an opening at the bottom, and the inner surfaces of the left and right vertical wall-shaped mounting portions are opposed to each other. The abutting portion is formed at a place to be performed.

  According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, bolt insertion holes are formed at two positions before and after the insertion hole through which the rear axle of the rear axle bracket is inserted, The contact portion is formed above the bolt insertion hole.

  According to the invention of claim 1, in a state where any one of the rear end portions of the trailing arm is temporarily fixed to the rear axle bracket by a bolt inserted into the inner cylinder of the mount bush and the bolt insertion hole of the rear axle bracket, When the trailing arm and the rear axle bracket are rotated relative to each other about the bolt, the contact portion formed on the rear axle bracket contacts the inner cylinder of the other mounting bush, and the bolt insertion hole of the inner cylinder and the bolt of the rear axle bracket Since both are accurately positioned by matching with the insertion holes, the bolts can be easily passed through these bolt insertion holes and workability can be achieved on the rear axle bracket via the mount bushing at the two rear ends of the trailing arm. Good and easy to install.

  According to the second aspect of the present invention, when the trailing arm and the rear axle bracket are temporarily fixed around the bolt, the contact portion formed on the rear axle bracket becomes the axial end of the inner cylinder of the mount bush. Since the covering of the elastic member on the outer periphery of the part abuts on the small diameter part, the trailing arm and the rear axle bracket are positioned accurately.

  According to the third aspect of the present invention, it is possible to easily form the abutting portion with high productivity by pressing a part of the outer surface of the mounting portion of the rear axle bracket from the outside to raise a portion of the inner surface of the mounting portion. In addition, high positional accuracy can be ensured between the corresponding contact portion and the hole position (the position of the bolt insertion hole of the inner cylinder of the mount bush and the bolt insertion hole of the rear axle bracket).

  According to the fourth aspect of the present invention, the rear axle bracket is composed of a channel member that opens downward, and the contact portions are formed at two opposing positions on the inner surfaces of the left and right vertical wall-shaped mounting portions. Since the bolt insertion hole of the inner cylinder and the bolt insertion hole of the rear axle bracket are positioned with high precision and they match, the bolt can be easily passed through these bolt insertion holes to improve the workability of the trailing arm and the rear axle bracket. Can be assembled easily.

  According to the invention of claim 5, the bolt insertion holes are formed at two positions before and after the insertion hole through which the rear axle of the rear axle bracket is inserted, and the contact portion is formed above one bolt insertion hole. When the trailing arm and the rear axle bracket are temporarily fixed by passing the bolt through the other bolt insertion hole, and the rear axle bracket is rotated using its own weight around this bolt, the contact portion formed on the rear axle bracket is mounted. The trailing arm and the rear axle bracket are easily positioned and assembled in contact with the inner cylinder of the bush with good workability.

It is a partially broken rear view showing the configuration of the vehicle rear suspension according to the present invention. 1 is a perspective view of a main part of a vehicle rear suspension according to the present invention. It is a figure of the arrow A direction of FIG. FIG. 4 is a sectional view taken along line BB in FIG. 3. It is a principal part perspective view which shows the assembly | attachment point of the rear suspension for vehicles which concerns on this invention. (A) is a top view of a trailing arm, (b) is a side view of the trailing arm. It is a top view of a rear axle bracket. It is a side view of a rear axle bracket. It is CC sectional view taken on the line of FIG.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 is a partially broken rear view showing a configuration of a vehicle rear suspension according to the present invention, FIG. 2 is a perspective view of a main part of the vehicle rear suspension, FIG. 3 is a view in the direction of arrow A in FIG. 3 is a cross-sectional view taken along line B-B of FIG. 3, FIG. 5 is a perspective view of the main part showing the assembly procedure of the vehicle rear suspension according to the present invention, FIG. 6 (a) is a plan view of the trailing arm, and FIG. 7 is a side view of the trailing arm, FIG. 7 is a plan view of the rear axle bracket, FIG. 8 is a side view of the rear axle bracket, and FIG. 9 is a sectional view taken along the line CC of FIG.

  The vehicle rear suspension 1 according to the present embodiment is a trailing arm type, and as shown in FIG. 2, a pair of left and right front ends supported on a vehicle body (not shown) via a mount bush 2 so as to be rotatable up and down. The trailing arm 3 is attached to the left and right rear axle brackets 6 via the mounting bushes 4 and 5 at the front and rear portions of each rear end. Here, the left and right rear axle brackets 6 are attached to both left and right ends of a cylindrical rear axle 7 arranged in the vehicle width direction.

  As shown in FIG. 1, knuckle spindles 8 are respectively attached to left and right end portions (only the left end portion is shown in FIG. 1) of the rear axle 7, and a rear wheel 9 is attached to each knuckle spindle 8 with a wheel. A bearing 10 is rotatably supported. Specifically, a hub 13 attached by a plurality of bolts 12 to the center portion of the wheel 11 of the rear wheel 9 is passed through the knuckle spindle 8 together with the wheel bearing 10 fitted to the inner periphery thereof, and the knuckle spindle As described above, the rear wheel 9 is rotatably supported on the knuckle spindle 8 via the wheel bearing 10 by tightening the nut 14 that is screwed into the end of 8. The left and right rear wheels 9 are suspended on the vehicle body frame 15 by a shock absorber 16 and a coil spring 17 that are interposed between the left and right of the rear axle 7 and the vehicle body frame 15. Specifically, the bolt 18 inserted into the rear mounting bush 5 that supports the rear end portion of the trailing arm 3 passes through the rear axle bracket 6 in the lateral direction and protrudes from the rear axle bracket 6 to the inside of the vehicle. The lower end portion of the shock absorber 16 is fixed to the protruding portion by a nut 19, and the upper end portion of the shock absorber 16 is attached to the vehicle body frame 15 by a bolt 20. The coil spring 17 is mounted between a spring receiver 21 provided on the left and right sides of the rear axle 7 and a spring seat 22 provided on the vehicle body frame 15 side, and the spring seat 22 has a rubber bump. A stopper 23 is attached.

  One end of a lateral rod 24 arranged in the lateral direction is bound to the left side portion of the rear axle 7 by a nut 25, and the other end of the lateral rod 24 is attached to a vehicle body (not shown).

  Next, main components of the vehicle rear suspension 1 according to the present invention will be described.

  Each of the trailing arms 3 arranged on the left and right in the longitudinal direction of the vehicle body is a press-formed product of a sheet metal, and as shown in FIG. It is formed in a frame shape. As shown in FIG. 6A, a rib (flange) 3a bent in the width direction is formed on the outer peripheral edge of each trailing arm 3, and the rigidity of the trailing arm 3 is increased by the rib 3a. Has been enhanced.

  As shown in FIG. 6B, a circular hole 3A is formed at the front end of each trailing arm 3, and the mount bush 2 is press-fitted into the circular hole 3A. The trailing end of each trailing arm 3 is formed in a bifurcated shape by forming a semicircular cutout 3b, and a front circular hole 3B is formed above the rear end. A rear circular hole 3C is formed obliquely below and below the circular hole 3B. The mount bushes 4 and 5 are press-fitted into the circular holes 3B and 3C, respectively.

  Here, FIG. 4 shows the configuration of the mount bush 5 press-fitted into the rear circular hole 3C formed at the rear end of the trailing arm 3. This mount bush 5 is made of metal concentrically arranged. The inner cylinder 5a, the outer cylinder 5b, and the elastic body 5c provided therebetween are formed. Here, on the outer periphery of the axial end portion of the inner cylinder 5 a of the mount bush 5, a small diameter portion 5 a 1 with a thin coating of the elastic member 5 c is formed. Although not shown, the other two mounting bushes 2 and 4 are configured in the same manner as the mounting bush 5.

  Each of the pair of left and right rear axle brackets 6 is constituted by a channel member that opens downward as shown in FIGS. 7 to 9, and the rear axle is located in the middle in the front-rear direction of the left and right vertical wall-shaped attachment portions 6A. A circular hole insertion hole 6a is formed through which the circular hole 7 is inserted, and a circular bolt insertion hole 6b and a long bolt insertion hole 6c are provided at two positions before and after the insertion hole 6a. Is formed. The axial end of the rear axle 7 is inserted into the large-diameter insertion hole 6a of each rear axle bracket 6, and the rear axle bracket 6 is connected to the left and right ends of the rear axle 7 by welding the peripheral edge of the insertion hole 6a. It is worn.

  Thus, in this embodiment, the inner surfaces of the left and right vertical wall-shaped mounting portions 6A of the rear axle bracket 6 are opposed to each other and above the rear bolt insertion hole 6c. Each contact portion 6d is formed. These contact portions 6d are formed by pressurizing a part of the outer surface of the attachment portion 6A from the outside to raise a part of the inner surface of the attachment portion 6A. Specifically, the abutting portion 6d is formed in a substantially square shape on the surface of the mounting portion 6A, and a straight line that connects the side of the substantially rectangular bolt insertion hole 6c side to the bolt insertion hole 6b and the elongated bolt insertion hole 6c. Are arranged substantially in parallel. Further, as shown in FIG. 4, this bolt insertion hole 6c side portion has a shape that protrudes (protrudes) into a wall surface perpendicular to the surface of the mounting portion 6A, and the axial direction of the inner cylinder 5a of the mount bush 5 The contact with the end portion (small diameter portion 5a1) is stable, and the bolt insertion hole 6c and the bolt insertion hole of the inner cylinder 5a can be accurately positioned.

  Next, a procedure for attaching the two rear end portions of the left and right trailing arms 3 to the left and right rear axle brackets 6 via the mount bushes 4 and 5 will be described.

  To attach the two rear end portions of the left and right trailing arms 3 to the left and right rear axle brackets 6 via the mount bushes 4 and 5, as shown in FIG. The left and right rear axle brackets 6 are covered so as to cover the mount bushes 4 press-fitted into the front circular holes 3B of the left and right trailing arms 1 from above, and bolt insertion holes (not shown) of the inner cylinder of the mount bushes 4 The bolt insertion hole 6b on the front side of the rear axle bracket 6 is aligned, and the trailing arm 3 and the rear arm bracket 6 are temporarily fixed through these bolts 26.

  Then, the left and right rear axle brackets 6 are rotated together with the rear axle 7 in the direction of the arrow in FIG. Then, the contact portion 6d formed above the bolt insertion hole 6c of the left and right mounting portions 6A of the left and right rear axle brackets 6 contacts the small diameter portion 5a1 of the inner cylinder 5a of the mount bush 5, and the rear axle bracket 6 is moved to the tray. It is positioned accurately with respect to the ring arm 3, and the bolt insertion hole 6 c of the rear axle bracket 6 matches the bolt insertion hole of the inner cylinder 5 a of the mount bush 5. For this reason, the bolt 18 can be easily passed through the bolt insertion hole 6c of the inner cylinder 5a of the mount bush 5 and the bolt insertion hole 6c of the rear axle bracket 6 with good workability, and the nuts 27, screwed into the bolts 18, 26, respectively. By tightening 28, the two rear end portions of the left and right trailing arms 3 are securely attached to the rear axle bracket 6 via the mount bushes 4 and 5, and the trailing arm 3 and the rear axle bracket 6 can be easily and accurately attached. The two can be easily assembled with good workability.

  Further, in the present embodiment, when both are relatively rotated around the bolt 26 that temporarily fixes the trailing arm 3 and the rear axle bracket 6, the abutting portion 6 d formed on the rear axle bracket 6 becomes the inner cylinder of the mount bush 5. Since the covering of the elastic member 5c on the outer periphery of the axial end of 5a contacts the small diameter portion 5a1, the trailing arm 3 and the rear axle bracket 6 are accurately positioned.

  Furthermore, in the present embodiment, a part of the outer surface of the attachment portion 6A of the rear axle bracket 6 is pressurized from the outside to raise the portion of the inner surface of the attachment portion 6A, thereby making the contact portion 6d easy with high productivity. It can be formed, and high positional accuracy can be ensured between the corresponding contact portion 6d and the hole position (the position of the bolt insertion hole 6c of the inner cylinder 5a of the mount bush 5 and the bolt insertion hole 6c of the rear axle bracket 6). .

  In the present embodiment, the rear axle bracket 6 is constituted by a channel member that opens downward, and the contact portions 6d are formed at two opposing positions on the inner surfaces of the left and right vertical wall-shaped mounting portions 6A. Since the bolt insertion hole of the inner cylinder 5a of the bush 5 and the bolt insertion hole 6c of the rear axle bracket 6 are positioned with high accuracy and match each other, the bolt 18 can be easily inserted into the trailing arm 3 and the rear axle bracket. 6 can be easily assembled with good workability.

  In the above embodiment, one front part of each rear end portion of the left and right trailing arms 3 is temporarily fixed to the rear axle bracket 6 by the bolt 26, but one rear part is fixed by the bolt 18. The rear axle bracket 6 may be temporarily rotated with respect to the trailing arm 3 around the bolt 18.

DESCRIPTION OF SYMBOLS 1 Vehicle rear suspension 2 Mount bush 3 Trailing arm 4,5 Mount bush 5a Inner cylinder of mount bush 5b Outer cylinder of mount bush 5c Elastic body of mount bush 6 Rear axle bracket 6A Rear axle bracket mounting part 6a Rear axle bracket insertion hole 6b, 6c Rear axle bracket bolt insertion hole 6d Rear axle bracket contact portion 7 Rear axle 18, 26 Bolt 27, 28 Nut

Claims (5)

Two front and rear positions of each rear end of a pair of left and right trailing arms, whose front ends are supported so as to be pivotable up and down, are mounted via a mount bush composed of an inner cylinder, an outer cylinder, and an elastic body provided therebetween. In the vehicle rear suspension, which is attached to the rear axle brackets respectively attached to the left and right ends of the rear axle.
With any one of the trailing end portions of the trailing arm temporarily fixed to the rear axle bracket by a bolt inserted into the inner cylinder of one mount bush, the trailing arm and the rear axle bracket are centered on the bolt. When the relative rotation is performed, the rear axle bracket is formed with a contact portion that contacts the inner cylinder of the other mounting bush and aligns the bolt insertion hole of the inner cylinder with the bolt insertion hole of the rear axle bracket to position the two. A featured vehicle rear suspension.   A thin-diameter portion with a thin coating of an elastic member is formed on the outer periphery of the axial end portion of the inner cylinder of the other mount bush, and a contact portion formed on the rear axle bracket is brought into contact with the small-diameter portion. The vehicle rear suspension according to claim 1.   3. The vehicle rear according to claim 1, wherein the abutting portion is formed by pressing a part of the outer surface of the mounting portion of the rear axle bracket from the outside to raise a portion of the inner surface of the mounting portion. suspension.   4. The rear axle bracket is constituted by a channel member having an opening at the bottom, and the abutting portions are formed at opposite positions on the inner surfaces of the left and right vertical wall-shaped mounting portions. The vehicle rear suspension according to claim 1. 2. A bolt insertion hole is formed at two positions before and after the insertion hole through which the rear axle of the rear axle bracket is inserted, and the contact portion is formed below one bolt insertion hole. The vehicle rear suspension according to any one of?

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