JP3228314B2 - Air spring suspension - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air spring type suspension mainly mounted on a large vehicle.

[0002]

2. Description of the Related Art In a rear-wheel air-spring suspension system for a heavy vehicle loaded with heavy objects, several links or rods are provided in order to restrict vertical movement of an axle case and movement other than right-and-left tilt (roll). Provided. As shown in FIGS. 4 and 5, in the conventional air spring type suspension system, a pair of front and rear transverse members 3 and 12 are connected to a vehicle frame 2 extending in the front and rear direction, and each of the horizontal members 3 protruding laterally from the vehicle frame 2. The upper ends of the air springs 13 and 15 are connected to the lower surfaces of the side ends of the axle beams 10.
Are connected by a known U bolt (not shown), and the lower ends of the air springs 13 and 15 are connected to the upper surfaces of the front and rear ends of the axle beam 10.

In order to suppress the longitudinal movement and the lateral movement of the axle case 8, a tray in the longitudinal direction is provided between a pair of left and right support plates 4 projecting downward from the horizontal member 3 and the inner wall of each axle beam 10. The ring rods 5 are connected to each other, and a pair of radius rods 6 extending diagonally forward and outward from the central portion of the axle case 8, that is, the upper wall of the final reduction gear 7, toward the vehicle frame 2 are connected.

In the above-mentioned conventional air spring type suspension system,
The longitudinal movement of the axle case 8 and the tilting (pitching) of the axle beam 10 are regulated by a pair of left and right trailing rods 5 and a pair of right and left radius slots 6, and the left and right movement of the axle case 8 is controlled by a pair of right and left radius slots. 6, the rotation of the axle case 8 in the horizontal plane (yaw movement)
Is regulated by a pair of right and left trailing rods 5.
Since the front and rear ends of the axle beam 10 are curved to the outside of the vehicle frame 2, the lateral spacing between the two pairs of front and rear air springs 13 and 15 is widened. The yaw moment of case 8 increases. In particular, left and right 1
Since the lateral interval between the pair of trailing rods 5 is narrow, the yaw momentum (rotation amount) between the axle case 8 and the pair of axle beams 10 increases.

In order to solve the above-mentioned problem, the lateral spacing between the pair of trailing rods 5 for restricting the yaw movement is increased to prevent the air springs 13 and 15 from reacting to the yaw moment caused by the lateral buckling. Increase the force moment or
It is necessary to increase the spring constant of the elastic bush such as rubber at the front and rear ends of the pair of trailing rods 5. But,
Increasing the lateral distance between the pair of left and right trailing rods 5 is not possible because the axle beam 10 and the rear wheel 14 become obstacles. In addition, when the spring constant of the elastic bush is increased, the ability to absorb high-frequency vibrations, which is particularly called "hashiness", is reduced.
The ride quality of the vehicle is impaired.

[0006]

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide an air spring type suspension apparatus capable of effectively suppressing the yaw motion of an axle beam without lowering the ability to absorb high frequency vibration. It is in.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention comprises a pair of front and rear cross members connected to a vehicle frame and front and rear of an arcuate axle beam supporting each end of an axle case. A pair of front and rear air springs are interposed between the ends, and an arc-shaped axle frame surrounding the upper half of the rear wheel is connected to the front and rear ends of the axle beam. A front-rear trailing rod is connected between the upper part of the side end of the member, a front-rear radius rod is connected between the center part of the axle case and the lower center part of the front cross member, and the axle case and the vehicle frame are connected. And lateral lateral rods connected between them.

[0008]

An arc-shaped or U-shaped axle frame surrounding the upper half of the rear wheel is connected to the upper side of the left and right axle beams, and a top end of each axle frame and a pair of lateral members protruding outward from the axle frame. Between,
A trailing rod that extends substantially horizontally in the front-rear direction is connected. Since each axle frame is located outside the axle frame, the lateral spacing between the pair of left and right trailing rods is widened, and the axle case and the axle beam have a large suppressing force against yaw motion.

[0009]

1 is a plan view of an air spring type suspension system according to the present invention, and FIG. 2 is a side sectional view of the same. The air spring type suspension system applied to a large bus in which the engine is mounted on the rear of the vehicle body is
A pair of front and rear transverse members 3 and 12 are connected to the vehicle frame 2 extending in the front and rear direction, and the upper ends of the air springs 13 and 15 are connected to the lower surface of the side end of each of the horizontal members 3 and 12 projecting sideways from the vehicle frame 2. On the other hand, both ends of the axle case 8 have a bow shape 1
A pair of axle beams 10 are connected by a known U-bolt, and lower ends of air springs 13 and 15 are connected to upper surfaces of front and rear ends of the axle beams 10.

According to the present invention, a pair of left and right axle beams 1 is provided.
An arc-shaped or inverted V-shaped axle frame 34 surrounding the upper half of the rear wheel 14 is connected to the front and rear portions. Specifically, axle frame 3
4 are welded to the upper surfaces of the front and rear ends of the axle beam 10. A trailing rod 32 extending substantially horizontally in the front-rear direction is connected between a front-rear central portion, that is, a top end of each axle frame 34, and a side end of the lateral member 3 protruding outward from the vehicle frame 2. More specifically, the front end of the trailing rod 32 is connected to a support plate 41 projecting upward from a side end of the horizontal member 3 by a lateral pin 42 by an elastic bush made of rubber or the like fitted to an eyeball. Similarly, at the rear end of the rod 32, the elastic bush fitted to the eyeball is connected to the top end of the axle frame 34 by a lateral pin 43.

A lateral lateral rod 37 is provided between the central portion of the axle case 8 (the upper wall of the final reduction gear 7) and the vehicle frame 2.
Center part of axle case 8 (lower wall of final reduction gear 7) and cross member 3
A radius slot 36 is connected between the center plate 1 and a support plate 44 projecting downward in the same manner as the trailing rod 32. The final reduction gear 7 has a propulsion shaft 7a projecting backward connected to a crankshaft of the engine via a transmission mounted on the rear of the vehicle body.

According to the structure of the present invention, the forward and backward movement and the forward and backward tilting of the axle case 8 and the axle beam 10 are regulated by the pair of trailing rods 32 and radius rods 36.
The lateral movement of the axle case 8 and the axle beam 10 is regulated by a lateral rod 37. The yaw movement of the axle case 8 and the axle beam 10 is regulated by a pair of left and right trailing rods 32.

By connecting the arc-shaped axle frame 34 to the upper side of the axle beam 10, the lateral spacing between the pair of right and left trailing rods 32 is increased, and the reaction force moment against the yaw motion of the axle case 8 can be increased. .

The connection point of the trailing rod 32 to the axle beam 10 (the top of the axle frame 34) is
, The vertical distance between the pair of trailing rods 32 and the radius slots 36 is increased, the reaction force moment against the forward and backward tilting of the axle beam 10 is increased, and the trailing rods are compared with the conventional example. There is no problem even if the spring constant of the elastic bush at the end of each of the radius rod 32, the radial rod 36, and the lateral rod 37 is reduced, and the ride comfort of the vehicle against high-frequency vibration can be improved. By arranging the trailing rod 32 and the radius rod 36 in an equal length and in parallel, it is possible to more effectively prevent the axle beam 10 from tilting back and forth.

In the above embodiment, a pair of diagonal lateral rods 6 as shown in FIG. 4 may be connected between the final reduction gear 7 and the left and right vehicle frames 2 instead of the lateral rods 37. Good.

In the embodiment shown in FIG. 3, an inverted U-shaped axle frame 34A straddling the axle frame 2 is connected to both ends of the axle case 8 instead of an arc-shaped axle frame surrounding the upper half circumference of the rear wheel. Frame 34A
A trailing rod 32 in the front-rear direction is connected between a protruding piece 34b protruding outward from the upper wall (upward of the rear wheel 14) and a support plate 41 of the horizontal member 3 connected to the vehicle frame 2. Things. Although not shown, a pair of lateral rods are diagonally connected between the final reduction gear 7 and the left and right vehicle frames 2 (see FIG. 4).

[0017]

As described above, according to the present invention, an arc-shaped or inverted V-shaped axle frame surrounding the upper half of the rear wheel is connected to the upper side of the left and right axle beams forming an arcuate shape. A trailing rod in the front-rear direction is connected between the vehicle and a lateral member protruding outward from the vehicle frame. Since each axle frame is disposed outside the vehicle frame, a pair of right and left trailing rods is provided. Of the axle case, a great restraining force acts on the yaw motion of the axle case, and very stable running can be obtained.

Since the connecting point of the trailing rod to the axle beam is above the rear wheel, the vertical distance between the pair of trailing rod and the radius rod is widened, and the restraining force against the forward and backward tilting of the axle beam is increased. Even if the spring constant of the elastic bush at each end of the trailing rod, radius rod, and lateral rod is reduced, there is no problem.
It has an excellent ability to absorb high-frequency vibrations and can improve the riding comfort of vehicles.

[Brief description of the drawings]

FIG. 1 is a plan view of an air spring suspension according to the present invention.

FIG. 2 is a side cross-sectional view of the air spring suspension according to line 2A-2A in FIG. 1;

FIG. 3 is a front sectional view of an air spring suspension according to a second embodiment of the present invention.

FIG. 4 is a plan view of a conventional air spring suspension.

FIG. 5 is a side sectional view of the air-spring suspension device.

[Explanation of symbols]

2: Car frame 3, 12: Horizontal member 8: Axle case 10:
Axle beam 13, 15: Air spring 14: Rear wheel 3
2: Trailing rod 34: Axle frame 36: Radius rod 37: Lateral rod

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B60G 9/00-9/04 B60G 11/26-11/28

Claims (2)

(57) [Claims] A pair of front and rear air springs are interposed and supported between both ends of a pair of front and rear transverse members coupled to a vehicle frame and front and rear ends of an arcuate axle beam supporting each end of an axle case. An arc-shaped axle frame surrounding the upper half of the rear wheel is connected to the front and rear ends of the axle beam, and a trailing rod in the front-rear direction is provided between the top end of the axle frame and the upper side end of the front cross member. Concatenate,
An air spring type suspension device comprising a front-rear radius rod connected between a central portion of an axle case and a lower central portion of a front cross member, and a lateral lateral rod connected between an axle case and an axle frame. . 2. A pair of front and rear air springs are interposed and supported between both ends of a pair of front and rear transverse members coupled to a vehicle frame and front and rear ends of an arcuate axle beam supporting each end of an axle case. Then, connect the inverted U-shaped axle frame that straddles the axle beam to the axle beam,
A front-rear trailing rod is connected between the top end of the axle frame and the upper side end of the front cross member, and a front-rear radius rod is connected between the center of the axle case and the lower center of the front cross member. And a pair of lateral rods extending diagonally forward and outward from a central portion of the axle case to a vehicle frame.