JPH06171331A - Rear wheel suspension for outotruck or the like - Google Patents

Abstract

PURPOSE:To improve travel stability during turning travel by connecting a laminated leaf-spring device to a rear axle housing through rubber pads, and disposing the pivotally fixing center point of a lateral rod to the rear axle housing in a higher position than the centers of pins for fixing the laminated leaf-spring device pivotally to an under carriage frame. CONSTITUTION:Rubber pad members 32 are disposed in the vicinity of both end parts in the vehicle width direction of a rear axle housing 16 so as to connect both end parts of the rear axle housing 16 to a laminated leaf-spring device 20 through the rubber pad members 32. One end of a lateral rod is pivotally fixed to the upper part of a differential casing 50 through a stud 52 and a ball joint device 54, and the center O of the ball joint device 54 is disposed in a sufficiently higher position than the centers of shackle pins 22, 26 for fixing the front end of the laminated leaf-spring device 20 pivotally to an under carriage frame 10. In the case of roll being generated to a body, the center O of the ball joint device 54 becomes the roll center, and overturning moment is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rear wheel suspension system for trucks and the like.

[0002]

2. Description of the Related Art In many trucks, rear axle housings supporting rear wheels at both end portions in the vehicle width direction are provided on both left and right sides of a chassis frame so as to extend in the vehicle front-rear direction and shackle the front and rear ends respectively. BACKGROUND ART A stacked leaf spring type rear wheel suspension device mounted on an intermediate portion of left and right stacked leaf spring devices pivotally supported by a chassis frame via a pin has been widely adopted.

When a truck or the like equipped with a rear wheel suspension device of this kind makes a turning motion, the rear axle housing is essentially rigidly connected to the leaf spring device by a tightening means such as a U-bolt. The roll center is at a low position near the center of the shackle pin that pivotally attaches the front and rear ends of the leaf spring device to the chassis frame. For this reason, when cargo is loaded on the platform and the center of gravity of the vehicle body is high, when the vehicle travels at a high speed, the overturning moment becomes extremely large, and there is a general tendency to roll over.

[0004]

SUMMARY OF THE INVENTION The present invention is directed to the running stability of a truck or the like having the above-mentioned leaf spring type rear wheel suspension system,
In particular, it is intended to improve running stability during turning.

[0005]

SUMMARY OF THE INVENTION The present invention was devised to achieve the above object, and includes a chassis frame, a rear axle housing supporting rear wheels at both ends in the vehicle width direction,
Left and right leaf spring devices that are interposed between the rear axle housing and the chassis frame and extend in the front-rear direction of the vehicle body, respectively, and one end of the leaf spring device that extends in the vehicle width direction and is located in the central portion of the rear axle housing. With a lateral rod pivotally attached to the upper part and the other end pivotally attached to the chassis frame, the stack leaf spring device is connected to the rear axle housing via a rubber pad that holds the rear axle housing from above and below, And the pivotal center point of the lateral rod with respect to the rear axle housing is
A rear wheel suspension device for a truck or the like is characterized in that an end portion in the vehicle body front-rear direction of the leaf spring device is arranged higher than a center of a pin pivotally attached to the chassis frame.

[0006]

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. In the drawings, reference numeral 10 denotes a chassis frame of a vehicle such as a truck, and a pair of left and right side rails 12 extending in the front-rear direction of the vehicle body, and a plurality of side rails extending in the vehicle width direction and having both ends fixed to the left and right side rails 12 described above. 1 cross member
4 and. Reference numeral 16 is a rear axle housing that supports a double tire type rear wheel 18 at both ends in the vehicle width direction, 20 is a front end portion of which is pivotally supported by a bracket 24 via a shackle pin 22, and a rear end portion of which is a shackle pin 26, 26 'and a leaf spring device pivotally supported by a bracket 30 via a shackle link 28. The brackets 24 and 30 are fixed to the side rails 12 of the chassis frame by a plurality of bolts or rivets, respectively.

Rubber pad members 32, which are well shown in the enlarged perspective view of FIG. 4, are provided on the upper and lower side surfaces of the rear axle housing 16 near both ends in the vehicle width direction. A U-shaped upper support member 34 having a shallow side surface is mounted on the upper rubber pad member 32, and the lower rubber pad member 32 also has a shallow side surface U.
It is mounted on a lower support member 36 having a character shape. Further, a tubular spacer 38 is interposed between the upper support member 34 and the lower support member 36, and a pair of front and rear U bolts 40 arranged at a substantially central portion in the front-rear direction of the leaf spring device 20. The upper and lower support members 34 and 3
6. By inserting the tubular spacer 38 into the tubular spacer 38 and tightening the nut 42, both end portions of the rear axle housing 16 are connected to the leaf spring device 20 via the rubber pad members 32, respectively.

As shown in the enlarged perspective view of FIG. 4, the rubber pad member 32 has a pair of U-shaped steel plate backings 44 and 46 each having a shallow cross section, and the backings 44 and 46. Shallow U sandwiched between and fixed by baking
It is composed of a rubber pad 48 having a character shape. Since the spacer 38 having a predetermined length is interposed between the upper and lower support members 34 and 36 when the U bolt 40 is tightened as described above, the rubber pad 48 has a preset compression force. Is working.

A differential casing 50 containing a differential gear device is arranged in a substantially central portion of the rear axle housing 16 in the vehicle width direction, and a stud 52 and a ball joint device 5 are provided on an upper portion of the casing 50.
4, one end of a lateral rod 56 is pivotally attached. The center O of the ball joint device 54 is located sufficiently higher than the centers of the shackle pins 22 and 26 that pivotally attach the front and rear ends of the leaf spring device 20 to the chassis frame 10. The other end of the lateral rod 56 is pivotally supported by the side rail 12 of the chassis frame via a similar ball joint device 58, and the ball joint device 58 is supported by a bracket 60 fixed to the side rail 12. .

An example of a concrete structure of the ball joint device 54 is well shown in FIG. As shown, a shaft portion 62 is formed on the upper end of the stud 52, and a spherical member 66 is attached to the coaxial portion 62 via a spacer 64. On the other hand, a spherical sheet member 70 fitted to the spherical member 66 is attached to an eye ring portion 68 at one end of the lateral rod 56 via a snap ring 72.

With this configuration, the lateral rod 56
Can freely rotate around the center line of the shaft portion 62 of the stud, and can freely rotate within a plane including the center line. The ball joint device 58 arranged at the other end of the lateral rod 56 also has substantially the same structure as the ball joint device 54.

Next, FIG. 6 shows the ball joint device 5 described above.
A rubber bushing joint device 74 is shown which can equally replace 4 and 58. As shown in the drawing, a spherical portion 78 is provided on a shaft portion 76 which is integrally formed with the stud 52 or is separately formed and attached to the stud 52 or the like, and the spherical portion 78 is concentric with the spherical portion 78 and the outside of the spherical portion. An annular rubber bush 82 is baked and fixed between the outer tube 80 and the outer tube 80. Further, the outer tube 80 is inserted into the fitting hole of the eye ring portion 68 formed at the end portion of the lateral rod 56 and is fixed in the axial direction by the snap ring 72, whereby the rubber bush type joint device 74 is provided.
Is assembled.

In the joint device 74, the outer tube 80 rotates around the center line of the shaft portion 76 in the fitting hole of the eye ring portion 68, so that the lateral rod 56 rotates around the shaft portion 76. In addition, the elastic deformation of the rubber bush 82 allows the lateral rod 56 to freely rotate within a preset angle range within a plane including the center line of the shaft portion 76.

According to the above construction, when a roll occurs on the vehicle body while the truck or the like is running, the rear axle housing 16 and the lap leaf spring device 20 on the vehicle body side are connected by the rubber pad member 32, and the rear axle housing 16 is connected.
Since the relative displacement between the shackle pin 22 and the leaf spring device 20, especially the relative displacement in the vehicle width direction, is allowed, the lateral rod 56 disposed at a position sufficiently higher than the center of the shackle pins 22 and 26 is disposed at the center of the rear axle housing 16. The center O of the ball joint device 54 pivotally attached to the portion serves as the roll center. For this reason, the overturning moment becomes smaller than in the conventional case, and it is possible to effectively improve the running stability especially during high-speed sharp turn running when the roll of the vehicle body is large.

[0015]

As described above, a rear wheel suspension system for a truck or the like according to the present invention includes a chassis frame, a rear axle housing supporting rear wheels at both ends in the vehicle width direction, the rear axle housing and the chassis frame. And left and right leaf spring devices, which are respectively interposed between the left and right, and extend in the vehicle width direction, and one end of which is pivotally attached to the upper central portion of the rear axle housing. An end portion is provided with a lateral rod pivotally attached to the chassis frame, and the leaf spring device is connected to the rear axle housing via a rubber pad that sandwiches the rear axle housing from above and below, and the lateral rod is attached to the rear axle housing. The pivot center point is the center of the pin that pivotally attaches the end of the leaf spring device in the vehicle front-rear direction to the chassis frame. Characterized in that it is arranged so high, the running stability during the rolling of the vehicle body, especially since it is possible to effectively improve driving stability during high-speed fast cornering is beneficial industrially.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of the present invention.

FIG. 2 is a plan view of the rear wheel suspension device shown in FIG.

3 is a sectional view taken along the line III-III in FIG. 2 and viewed in the direction of the arrow.

FIG. 4 is an enlarged perspective view of a rubber pad member 32 in FIG.

5 is an enlarged sectional view of the ball joint device 54 in FIG.

6 is a cross-sectional view of a rubber bush type joint device that replaces the ball joint device shown in FIG.

[Explanation of symbols]

 10 Chassis Frame 12 Side Rail 16 Rear Axle Housing 18 Rear Wheel 20 Lap Leaf Spring Device 32 Rubber Pad Member 54 and 58 Ball Joint Device 56 Lateral Rod

Claims (1)

[Claims] 1. A chassis frame, a rear axle housing that supports rear wheels at both ends in the vehicle width direction, and left and right leaf springs that are interposed between the rear axle housing and the chassis frame and extend in the vehicle front-rear direction, respectively. And a lateral rod having one end pivotally attached to the central upper portion of the rear axle housing and the other end pivotally attached to the chassis frame. The device is connected to the rear axle housing via rubber pads that sandwich the rear axle housing from above and below, and the pivotal center point of the lateral rod with respect to the rear axle housing is the end portion of the leaf spring device in the longitudinal direction of the vehicle body. The rear wheel suspension of a truck or the like characterized by being arranged at a higher position than the center of the pin pivotally attached to the chassis frame. Rack device.