JP2011162094A - Lateral rod mounting structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lateral rod mounting structure improving ease of mounting operation. <P>SOLUTION: The lateral rod 4 is disposed in a vehicle width direction of the vehicle and constitutes a part of a suspension. One end of the lateral rod 4 is attached to a vehicle body through a bush, and the other end is attached to an axle pipe (axle component) 2 through a bush 17. The lateral rod 4 is mounted to the axle pipe 2 as follows. That is, a nut 19, which has at the front end thereof a guide part 19c fitted in an inner circumference of one end in the axial direction of an inner tube 17a of the bush 17 attached to the end portion of the lateral rod 4, is attached to the axle pipe 2. The one end in the axial direction of the inner tube 17a of the bush 17 is fitted in the guide part 19c of the nut 19. A bolt 21 inserted into the inner tube 17a of the bush 17 is fastened against a female screw part 19a formed in the nut 19. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a structure for mounting a lateral rod, which is arranged in the vehicle width direction of a vehicle and forms a part of a suspension, to an axle part.

  A suspension for suspending a vehicle wheel with respect to a vehicle body is provided with a lateral rod for receiving a lateral force generated at a tire contact point when the vehicle is turning and positioning the tire in the lateral direction. This lateral rod is a long part arranged along the vehicle width direction, one end of which is attached to the vehicle body side via a bush and the other end is attached to an axle part such as an axle pipe via a bush. It has been.

  Here, a conventional example of a structure for attaching a lateral rod to an axle pipe shaft will be described with reference to FIGS.

  8 is a partial perspective view showing a conventional lateral rod mounting structure, and FIG. 9 is a cross-sectional view of FIG. 8. A round bar-shaped pin 119 is provided on the left end side of the axle pipe 102 arranged in the vehicle width direction. A male screw portion 119a is formed at the tip of the pin 119 that is bound and extends rearward of the vehicle.

  On the other hand, a bush 117 is attached to both ends of the lateral rod 104. When the lateral rod 104 is attached to the vehicle, first, one end of the lateral rod 104 is first attached to the vehicle body via one end side bush 117 (not shown). After that, the inner cylinder 117a of the other end side bush 117 is passed through the pin 119 from the rear of the vehicle, and the nut 121 is screwed into the male thread portion 119a of the pin 119 protruding from the inner cylinder 117a through the washer 120, thereby lateral rod 104. Is attached to the axle pipe 102 via a pin 119.

  In addition, regarding the mounting structure of the lateral rod, Patent Document 1 discloses that the lateral pin for mounting the lateral rod is mounted using an existing spring seat, thereby increasing the mounting rigidity of the lateral pin and reducing the number of parts. Thus, a configuration has been proposed in which cost reduction and space saving are achieved.

Japanese Patent No. 3741301

  However, in the conventional lateral rod mounting structure shown in FIGS. 8 and 9, it is not easy to attach the other end of the lateral rod 104 whose one end on the vehicle body side is first attached to the vehicle body to the axle pipe 102. This is because it is difficult to position the lateral rod 104 on the axle pipe 102 of the suspension whose position is movable with respect to the vehicle body, and the long pin 119 must be inserted into the inner cylinder 117a of the bush 117.

  The lateral rod 104 can be positioned with respect to the axle pipe 102 to some extent by adjusting the suspension state with a jig or the like. However, in order to insert the long pin 119 into the inner cylinder 117a of the bush 117, the rubber of the bush 117 is used. The elastic body 117c must be deformed, and this operation is not easy. That is, since one end of the lateral rod 104 is already fixed to the vehicle body, the lateral rod 104 swings around the attachment point to the vehicle body (the deformation of the rubber-like elastic body 117c of the bush 117 (not shown) on the vehicle body side). Can only swing). Since the pin 119 extends in a substantially tangential direction with respect to this swinging, the position and inclination of the pin 119 and the inner cylinder 117a of the bush 117 are shifted at the initial stage of insertion, and therefore a bush 117 (not shown) on the vehicle body side is moved. In addition to being elastically deformed, the bush 117 on the axle pipe 102 side must also be elastically deformed to insert the pin 119 into the inner cylinder 117a of the bush 117, which makes the insertion work difficult and the workability deteriorated.

  The present invention has been made in view of the above problems, and an object thereof is to provide a lateral rod mounting structure capable of improving the assembly workability.

  In order to achieve the above object, the invention according to claim 1 is arranged in the vehicle width direction of the vehicle to constitute a part of the suspension, one end is attached to the vehicle body side via a bush, and the other end is interposed via the bush. As a structure for attaching the lateral rod attached to the axle part to the axle part, a guide part is formed at the tip to be fitted to the inner circumference of one end in the axial direction of the inner cylinder of the bush attached to the end part of the lateral rod. A female screw formed on the nut, and a bolt inserted into the inner cylinder of the bush is fitted to the guide part of the nut. A configuration is adopted in which the lateral rod is attached to the axle part by being screwed into a portion.

  The invention according to claim 2 is characterized in that, in the invention according to claim 1, the length of the guide portion of the nut is set to be half or less of the length of the inner cylinder of the bush.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, a fitting portion that is fitted to the inner periphery of the other end in the axial direction of the inner cylinder of the bush is formed in a lower neck portion of the bolt. And

  According to the first aspect of the present invention, the axial inner end of the inner cylinder of the bush attached to the end of the lateral rod is fitted to the guide portion formed at the tip of the nut so that the end of the lateral rod ( The end of the lateral rod is attached to the axle part by inserting the bolt into the inner cylinder of the bush and screwing it into the female thread of the nut. As a result, the amount of swinging of the lateral rod centered on the vehicle body side fixed point can be kept small, and the mounting of the lateral rod to the axle part can be facilitated to improve the assembly workability. .

  According to the second aspect of the present invention, since the length of the guide portion of the nut is set to be less than or equal to half the length of the inner tube of the bush, the insertion length of the guide portion into the inner tube of the bush is shortened. Assembling workability to the axle part of the rod is improved.

  According to the third aspect of the present invention, since the inner cylinder of the bush is held by the guide portion of the nut and the fitting portion of the bolt that are fitted to the bush, the vibration of the bolt caused by the disturbance during the traveling of the vehicle is suppressed. , Loosening of the bolt is prevented. In addition, since the fitting part of the bolt can be fitted to the inner cylinder of the bush to transmit the load, even if the length of the guide part of the nut is shortened in consideration of assembly, the load transmission path Is ensured and the lateral rod can be securely and stably attached to the axle part.

It is a partial rear view of a rear suspension provided with a lateral rod mounting structure according to the present invention. It is a perspective view of a rear suspension provided with the lateral rod attachment structure concerning the present invention. FIG. 3 is an enlarged detail view of part A in FIG. 2. FIG. 4 is a cross-sectional view of FIG. 3. FIG. 4 is an exploded perspective view of FIG. 3. FIG. 5 is an exploded perspective view of FIG. 4. (A)-(c) is sectional drawing which shows the attachment procedure of a lateral rod. It is a fragmentary perspective view which shows the conventional attachment structure of a lateral rod. It is sectional drawing of FIG.

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

  1 is a partial rear view of a rear suspension provided with a lateral rod mounting structure according to the present invention, FIG. 2 is a perspective view of the rear suspension, FIG. 3 is an enlarged detail view of part A in FIG. 2, and FIG. 4 is a sectional view of FIG. 5 is an exploded perspective view of FIG. 3, FIG. 6 is an exploded perspective view of FIG. 4, and FIGS. 7A to 7C are cross-sectional views showing a lateral rod mounting procedure.

  The rear suspension 1 shown in FIGS. 1 and 2 is of a trailing arm type (three-link type), and extends in the vehicle front-rear direction through an axle pipe 2 arranged in the vehicle width direction (left-right direction in FIG. 1). A pair of left and right trailing arms 3 (see FIG. 2) and a lateral rod 4 arranged in the vehicle width direction are supported on the rear vehicle body 5, and a pair of left and right coil springs 6 and a shock absorber 7 (only one is shown in FIG. 1). Thus, the axle pipe 2 is suspended from the rear vehicle body 5.

  As shown in FIG. 1 (only one end is shown in FIG. 1), a rear wheel 8 is rotatably supported by bearings 9 and 10 at both left and right ends of the axle pipe 2, and the coil spring 6 is connected to the axle pipe. A spring seat (only one is shown in FIG. 1) 11 bound to the left and right of the pipe 2 and a spring seat 12 bound to the lower surface of the rear vehicle body 5 above the spring seat 12 are interposed. The spring seat 12 on the rear vehicle body 5 side is attached with a rubber bump stopper 13 that abuts the axle pipe 2 and restricts the upward swing of the rear wheel 8.

  By the way, the lateral rod 4 arranged in the vehicle width direction is a component for receiving lateral force generated at the tire ground contact point of the rear wheel 8 when turning the vehicle and positioning the rear wheel 8 in the lateral direction. One end (right end) of the rear vehicle body 5 is connected to a bracket 14 (see FIG. 1) that hangs down from the right bottom of the rear vehicle body 5 via a bush 15. The other end (left end) of the lateral rod 4 is attached to the inside of the rear wheel 8 of the left end portion of the axle pipe 2 by an attachment structure described below.

  That is, as shown in FIGS. 3 to 6, a cylindrical sleeve 16 is bound to the left end portion of the lateral rod 4, and a bush 17 is press-fitted into the sleeve 16. Here, the bush 17 is configured by filling a rubber-like elastic body 17c by vulcanization bonding or the like between a metallic inner cylinder 17a and an outer cylinder 17b arranged concentrically.

  On the other hand, a bracket 18 made of sheet metal is attached to the left end portion of the axle pipe 2, and a round bar-like nut 19 is welded to the end portion of the bracket 18. The nut 19 extends toward the rear of the vehicle, and a circular hole-shaped female screw portion 19a that opens toward the rear is formed at the center of the shaft inside thereof. Further, a hook-shaped stopper 19b is integrally formed on the outer periphery of the nut 19, and a guide portion 19c is formed at the front end portion behind the stopper 19b. The outer diameter of the guide portion 19c is set slightly smaller than the inner diameter of the inner cylinder 17a of the bush 17, and the length thereof is set to be half or less of the length of the inner cylinder 17a of the bush 17.

  Thus, when the lateral rod 4 is assembled, first, one end (right end) of the lateral rod 4 is fixed to the bracket 14 shown in FIG. 1 via the bush 15 (see FIG. 2). The other end (left end) of the lateral rod 4 is attached to the axle pipe 2 via the nut 19 and the bracket 18 in the manner shown in FIGS.

  That is, in a state where the right end portion of the lateral rod 4 is first attached to the vehicle body side, the sleeve 16 attached to the left end portion of the lateral rod 4 and the bush 17 press-fitted thereto are shown in FIGS. 7 (a), it is located behind the nut 19. From this state, the lateral rod 4 is swung in the direction of the arrow shown with the attachment point at the right end as the center of rotation, as shown in FIG. 7 (b). One end of the inner cylinder 17a of the bush 17 held at the left end of the lateral rod 4 is fitted to the guide part 19c formed at the tip of the nut 19, and the end face of the nut 19 is connected to the axial end surface of the inner cylinder 17a. It abuts on a stopper 19b formed on the outer periphery. That is, the guide portion 19c is inserted into the inner cylinder 17a until the stopper 19b comes into contact with the axial end surface of the inner cylinder 17a. The swinging of the lateral rod 4 at this time is allowed by the elastic deformation of the rubber-like elastic body of the bush 15 held at the right end of the lateral rod 4, but the guide portion 19c of the nut 19 is the inner cylinder 17a of the bush 17. Since the length is set to half or less of the length of the guide portion 19c of the nut 19 as described above, the swinging amount of the lateral rod 4 can be kept small. Further, the elastic deformation amount of the rubber-like elastic body of the bush 15 held at the right end portion of the lateral rod 4 can be suppressed to be small.

  7B, when the axial end of the inner cylinder 17a of the bush 17 is partially fitted to the guide portion 19c of the nut 19, the right end portion (bush 17) of the lateral rod 4 is fitted. Is temporarily held by the nut 19. Then, from this state, as shown in FIGS. 3, 4 and 7C, the bolt 21 passed through the washer 20 is passed through the inner cylinder 17a of the bush 17 from the rear of the vehicle, and the male threaded portion 21a at the tip thereof. Is screwed into the female threaded portion 19 a of the nut 19, the inner cylinder 17 a is sandwiched between the stopper 19 b and the washer 20, and the bush 17 is fixed to the nut 19, and the left end portion of the lateral rod 4 is interposed via the bush 17 and the nut 19. It is attached to the axle pipe 2.

  Here, a stepped fitting portion 21b whose outer diameter is slightly smaller than the inner diameter of the inner cylinder 17a of the bush 17 is formed in the lower portion of the neck of the bolt 21, and the male screw portion 21a of the bolt 21 is shown in FIG. 4 and 7 (c), in the state of being screwed onto the female screw portion 19a of the nut 19, the fitting portion 21b of the bolt 21 is the inner circumference of the other end in the axial direction of the inner cylinder 17a of the bush 17. To fit. Therefore, in the state where the left end portion of the lateral rod 4 is attached, the inner cylinder 17a of the bush 17 is held by both the guide portion 19c of the nut 19 and the fitting portion 21b of the bolt 21 which are fitted to the inner cylinder 17a. The swing of the bolt 21 caused by disturbance during traveling is suppressed, and the bolt 21 is prevented from loosening. Further, since the fitting portion 21b of the bolt 21 can be fitted to the inner cylinder 17a of the bush 17 to transmit the load, the length of the guide portion 19c of the nut 19 is set as described above in consideration of the assembling property. Even if it is shortened, the load transmission path is secured and the lateral rod 4 can be securely and stably attached to the axle pipe 2.

  In the present embodiment, the length of the fitting portion 21b of the bolt 21 is set to be equal to or less than half the length of the inner cylinder 17a of the bush 17 in the same manner as the length of the guide portion 19c of the nut 19. An increase in tightening torque due to friction with the inner cylinder 17a of the bush 17 when the bolt 21 is tightened is suppressed. Further, the fitting portion 21b of the bolt 21 is prevented from being inserted into the inner cylinder 17a of the bush 17 before the male screw portion 21a at the tip of the bolt 21 is screwed into the female screw portion 19a of the nut 19. Since the male threaded portion 21a of the bolt 21 can be screwed into the female threaded portion 19a of the nut 19 without being affected by the posture of the inner cylinder 17a, the bolt 21 is tightened. It becomes easy.

  The washer 20 passed through the bolt 21 is a part for restricting the movement of the bush 17 in the axial direction, and the outer diameter thereof is set larger than the outer diameter of the outer cylinder 17b of the bush 17. . For this reason, when the rubber-like elastic body 17c of the bush 17 is greatly deformed, the edge of the outer cylinder 17b comes into contact with the washer 20, and the further movement of the outer cylinder 17b is restricted by the washer 20. Further, since the outer diameter of the washer 20 is set to be larger than the outer diameter of the sleeve 16, even if the lateral rod 4 is detached from the bush 17, the washer 20 is reliably prevented from coming off. A bolt insertion hole 20a (see FIG. 7) through which the bolt 21 is inserted is formed at the center of the washer 20. The bolt 21 inserted through the bolt insertion hole 20a and the inner cylinder 17a of the bush 17 is the nut 19. The washer 20 is clamped between the end surface of the inner cylinder 17a of the bush 17 and the head portion 21c of the bolt 21.

  As described above, according to the mounting structure of the lateral rod 4 according to the present invention, the axial direction of the inner cylinder 17a of the bush 17 attached to the end portion of the lateral rod 4 to the guide portion 19c formed at the tip of the nut 19 is achieved. The end of the lateral rod 4 (bush 17) is temporarily held by the nut 19 by fitting the inner periphery of one end, and the bolt 21 is inserted into the inner cylinder 17a of the bush 17 from this state, and this is inserted into the female screw of the nut 19 Since the left end portion of the lateral rod 4 is attached to the axle pipe 2 by screwing into the portion 19a, the length of the guide portion 19c of the nut 19 can be shortened. As a result, the lateral rod 4 is fixed at the vehicle body side fixing point. The amount of swinging can be kept small, and the effect that the lateral rod 4 can be easily attached to the axle pipe 2 and the assembly workability is improved can be obtained.

  Moreover, since there is no pin-like long projection in the mounting portion of the lateral rod 4, the mounting portion does not obstruct the transfer, and the mounting portion collides with other parts during the transfer. Other parts are not damaged. Furthermore, in the attachment part of the lateral rod 4, since the female thread part 19a of the nut 19 and the male thread part 21a of the bolt 21 are not exposed to the outside, these damages are prevented.

1 Rear suspension 2 Axle pipe (Axle parts)
3 Trailing arm 4 Lateral rod 5 Rear body 6 Coil spring 7 Shock absorber 8 Rear wheel 9, 10 Bearing 11, 12 Spring seat 13 Bump stopper 14 Bracket 15 Bush 16 Sleeve 17 Bush 17a Bush inner cylinder 17b Bush outer cylinder 17c Rubber elastic body of bush 18 Bracket 19 Nut 19a Nut female thread 19b Nut stopper 19c Nut guide 20 Washer 20a Washer bolt insertion hole 21 Bolt 21a Bolt male thread 21b Bolt fitting 21c Bolt fitting head

Claims (3)

A lateral rod that is arranged in the vehicle width direction of the vehicle and forms a part of the suspension. One end is attached to the vehicle body side via a bush and the other end is attached to the axle part via the bush. Structure,
A nut formed at the tip of a guide portion fitted to the inner periphery of one end in the axial direction of the inner cylinder of the bush attached to the end portion of the lateral rod is attached to the axle part, and the bush is attached to the guide portion of the nut. The lateral rod is attached to the axle part by fitting one end in the axial direction of the inner cylinder and screwing a bolt inserted into the inner cylinder of the bush into a female thread portion formed on the nut. Lateral rod mounting structure.   2. The lateral rod mounting structure according to claim 1, wherein the length of the guide portion of the nut is set to be equal to or less than half of the length of the inner cylinder of the bush. The lateral rod mounting structure according to claim 1, wherein a fitting portion is formed on a lower neck portion of the bolt so as to be fitted to an inner periphery of the other end in the axial direction of the inner cylinder of the bush.

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