JPH0532013U - Air spring mounting structure for suspension - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention has good durability even when using a kick-up frame in which the rear end side of the side member is raised, and even when a pair of air springs is arranged in the front-rear direction of the side member. An object of the present invention is to provide an air suspension device that can be set to a constant height with the same member. The present invention comprises a side member 13 having a side wall surface which is vertically raised from a bottom surface and constituting a chassis frame, and a bracket 40 attached to an upper surface side of an air spring 11, and a bottom surface of the side member 13. The bracket 40 is fixed to the side member 13 side wall surface in a non-contact state. The bracket does not necessarily have to be formed of one member, but may be formed of a pair of members arranged on both front and back sides of the side member side wall surface.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a rigid axle suspension (axle suspension system) that is widely used for front and rear axles of buses and trucks and rear axles of passenger cars. In particular, the axle and chassis are supported by a pair of air springs arranged on both sides of the axle. It relates to a mounting structure for an air spring used for suspension that suspends between frames.

[0002]

[Prior Art]

 The axle type suspension device is inexpensive and easy to maintain because of its simple structure. It is relatively advantageous in terms of strength, and there is little change in the alignment due to the vertical movement of the wheels, and little tire wear. Because of its advantages, it has been widely used in the front and rear axles of buses and trucks and the rear axles of passenger cars. As a typical suspension device of this type, there is a suspension device using a so-called parallel leaf spring, in which an axle connecting the left and right wheels is connected to a leaf spring arranged in the front-rear direction to position the axle.

On the other hand, in a bus or the like, a suspension device using an air spring in place of the leaf spring has been proposed in order to ensure riding comfort and steering stability. Such a suspension device is provided on both sides of an axle. It is configured by suspending between the axle and the chassis frame via an air spring, and the space between the air spring and the side members constituting the chassis frame is fixed on the upper surface of the air spring 11 as shown in FIG. 5 (A). The bracket 101 having a U-shaped cross section is used to fix the side member 102 on both upper and lower surfaces by screwing, or the bracket 103 having an inverted T-shaped cross section is used as shown in FIG. The bottom surface of the member 102 and the vertical wall surface are secured by screw fastening. Reference numeral 100 in the figure denotes a support beam that integrally supports the air spring with the axle.

[0004]

[Problems to be Solved by the Invention] For a general truck, a so-called kick-up frame is used in which the lower (bottom) surface of the rear end of the side member is tilted upward to be rounded up for weight balance and other reasons. Therefore, if the mounting structure shown in FIG. 5 is adopted in the rear wheel suspension device, all of these mounting structures make the bottom surface of the side member and the top surface of the air spring contact through the fastening plate of the bracket. Therefore, as a result, the air spring 11 is forcedly fixed to the inclined surface 102a as shown in (C), so that the durability of the rubber member forming the air spring 11 is deteriorated. Further, as described above, when a pair of air springs are arranged in the front and rear direction of the side members on both sides of the axle, the mounting heights of the air springs are set constant in order to set the same spring pressure. However, if the bottom surface of the side member is inclined in the front-back direction as described above, it is necessary to use a plurality of brackets having different mounting heights, and as a result, the mounting height can be adjusted as the number of parts increases. It becomes complicated.

In the above-mentioned prior art, the side member constituting the frame is formed with a hole in the bottom surface or the upper surface of the side member. In this way, the upper and lower flange surfaces of the side member are drilled. Alternatively, when riveting is performed, cracks or the like are likely to occur on the perforated surface, and particularly in a structure where a large load is applied from the loading platform side such as a truck, the strength of that portion is reduced, and a safety problem is likely to occur.

In view of the drawbacks of the prior art, the present invention provides a pair of air springs in the front-rear direction of the side member with good durability even when a kick-up frame in which the rear end side of the side member is cut up is used. It is an object of the present invention to provide an air suspension device that can be set to a constant height with the same member even in the case of doing so. Another object of the present invention is to provide an air suspension device in which an air spring can be attached without making a hole in a flange surface of either the bottom surface or the top surface of the side member.

[0007]

[Means for solving the problem]

 As shown in FIG. 1, the present invention includes a side member 13 having a side wall surface which is vertically raised from a bottom surface and constituting a chassis frame, and a bracket 40 attached to an upper surface side of an air spring 11, The bracket 40 is fixed on the side wall surface of the side member 13 without contacting the bottom surface of the side member 13. The bracket does not necessarily have to be formed of one member, but may be formed of a pair of members arranged on both front and back sides of the side member 13 side wall surface.

[0008]

[Action]

 Since the side wall surface of the side member 40 is formed as a vertical wall surface up to the end of the member 40, even when the air spring 11 is attached to a so-called kick-up frame, the bracket does not contact the bottom surface of the frame. By fixing 40 to the side wall surface of the frame, the air spring 11 can be attached at any position irrespective of the inclined surface of the bottom surface of the side member 13, and as a result, a pair of air springs are provided in the front and rear direction of the side members 13 on both sides of the axle. Even when the spring 11 is arranged, it is possible to fix the same bracket 40 at a fixed mounting height, which reduces the number of parts and facilitates the mounting height adjustment. Further, since the bottom surface of the side member 13 and the upper surface of the air spring 11 are arranged in a non-contact state, the air spring 11 is not forcibly deformed along the inclined surface as a result, and the rubber forming the air spring 11 is not. The durability of the member does not deteriorate. Further, the bracket 40 is fixed to the side wall surface of the side member 13 having a wide area, and the fixing is not limited to one side, but may be supported by a pair of members from both front and back sides as shown in an embodiment described later. It is possible, and by doing so, it becomes a substantially triangular standing structure, and a strong bracket structure can be achieved.

Further, in the present technical means, since neither the bottom surface nor the upper surface of the side member 13 is drilled, only the side wall having a large area is drilled or riveted. In addition, cracks and the like do not occur on the perforated surface, and even in a structure in which a heavy load is applied from the loading platform side such as a truck, the strength is not deteriorated and the safety is improved. Therefore, the present invention is preferable because it makes it possible to comply with the so-called superframe design policy.

[0010]

【Example】

 Hereinafter, embodiments of the present invention will be illustratively described in detail with reference to the drawings. However, unless otherwise specified, the dimensions, materials, shapes, relative positions, etc. of the constituent parts described in this embodiment are not intended to limit the scope of the present invention to them, but are simple. It's just an example. 2, 3 and 4 show a rear wheel steering device incorporating an air suspension according to an embodiment of the present invention. The chassis frame 1 of a vehicle such as a truck includes a pair of left and right side members 13 extending parallel to the front-rear direction of the vehicle body, and a plurality of cross members 15 extending in the vehicle width direction and having both ends fixed between the side members 13. It consists of The rear axle housing 2 is made of a rigid tubular body supporting double tires 18 at both ends in the vehicle width direction, and the housing 2 is fixed by a fastener at a substantially central position on an upper surface of a support beam 17 extending substantially horizontally. After that, the housing 2 is sandwiched between the left and right side members 13 via a pair of air springs 11 mounted on both sides of the beam 17.

Next, the mounting structure of the side member 13 and the air spring 11 will be described in detail with reference to FIGS. The side member 13 has a U-shaped cross-section that opens toward the center of the vehicle width, and increases the height of the side wall surface to widen the area of the wall surface, and the bottom surface side is directed upward toward the end side. Take a kick-up frame configuration tilted to. The air spring 11 is an air spring composed of a sleeve type diaphragm, and an air supply port 111 is provided on the upper surface thereof. The bracket 40 is provided on almost the entire upper surface of the air spring 11 excluding the air supply port, and is integrally fixed to the upper surface of the side member 13 to support plate 401 and the support plate 401 on the opposite side of the air supply port 111. It is composed of an outer bracket 402 that is vertically installed from one side and has a U-shaped cross section that opens toward the outside of the vehicle width, and an inner bracket 403 that is an inclined plate with the upper end vertically bent and the lower end horizontally bent. ..

The outer bracket 402 is welded to the support plate 401 so as to stand vertically. On the other hand, the inner bracket 403 is arranged at a position opposed to the outer racket 402 via the side member 13, and the lower end side Using the horizontal portion of the above, the screw 404 is fixed to the upper surface of the support plate 401, and the vertical portion on the upper end side is brought into contact with the vertical surface of the outer bracket 402 through the side member 13 to form a trinity. The screw 405 is tightened or riveted. At this time, as the bottom surface of the side member 13 is separated from the upper surface of the support plate 401, the member 13 is fixed in a floating state. The screw 405 fastening portion of the side member 13 is preferably formed in the shape of an elongated hole extending vertically so that the mounting height between the air spring 11 and the side member 13 can be adjusted.

As shown in FIG. 3, the pair of air springs 11 arranged on both sides of the housing 2 with the housing 2 sandwiched therebetween adjust the gap between the bottom surface of the side member 13 and the top surface of the support plate 401 to adjust the air spring 11 top surface. The screws 405 are tightened so that the mounting height of the is constant. According to this structure, the bottom surface and the top surface of the side member 13 are not threaded, and the mounting height of the upper surface of the air spring 11 can be made constant regardless of the inclined surface of the kick-up frame. The operation of the present invention can be achieved smoothly.

Returning to FIG. 2, the steering center fixing rod 3 has a planar V-shape, and the top portion thereof is vertically provided on the center of the upper surface of the central bulging portion 2 B of the rear axle housing 2 including the differential casing 21. The pivotal fulcrum 2A (pillar pin) is rotatably supported in a plane direction, and both legs of the rod 3 are extended symmetrically toward the front of the vehicle in a divergent shape, and the free end is provided on the first bracket. It is supported by an L-shaped wall formed between the side member 13 of the chassis frame 1 and the fastening portion of the cross member 15 via 41.

On the other hand, on the side wall surface of each side member 13 corresponding to the projecting position of the shaft end of the rear axle housing 2, a hydraulic cylinder 4 is directed forward of the vehicle through a web 23 in parallel with the side wall surface of the member 13. The piston shaft 25 is horizontally extended, and one end of a piston shaft 25 provided on the front side of the piston shaft 25 is pivotally supported on the upper end of the rotary lever 6. The rotating lever 6 is attached to the second bracket 27, which is fastened to the outer wall surface of the side member 13 facing the first bracket 41 via the side member 13, along a plane substantially perpendicular to the actuator 4. The shaft is pivotally supported by a predetermined angle, and the distance between the actuator 4 connecting part on the upper end side and the steering operation rod 5 connecting part on the lower end side is set to 1: 1 from the shaft supporting point 6A.

The steering operation rod 5 has a rod shape having connecting portions 5 a and 5 b at both ends, extends horizontally along a plane substantially vertical to the actuator 4, and has one end at the lower end of the rotation lever 6. Then, the other end is pivotally supported through a support beam 17 into a mounting hole 29a of a bracket 29 provided on the vertical center line of the housing 2 through a pin 33. Reference numeral 19 is a stabilizer attached to the rear end of the support beam 17.

To briefly explain the operation of the present embodiment, when the front wheels are steered while the vehicle is traveling at high speed, the control valve operates in response to a command from the controller, and as shown in FIG. When the rear wheel steering actuators 4 operate in opposite directions, the rotating levers 6 connected to the respective ends of the actuators 4 rotate in opposite directions along the vertical plane, and The right (left) side turning operation rod 5 connected to the other end of the moving lever 6 is driven to the front of the vehicle body, and the left (right) side turning operation rod 5 is driven to the rear side of the vehicle body in a substantially horizontal direction.

As a result, the shaft end of the rear axle housing 2 is pushed / pulled via the bracket 27 and the support beam 17, and the rear axle housing 2 rotates a predetermined angle around the rotation fulcrum 2A, and follows this. Then, the rear wheels 18 are steered.

[0019]

【effect】

 As described above, according to the present invention, even when a kick-up frame in which the rear end side of the side member is raised is used, the durability is good and the same is achieved even when a pair of air springs are arranged in the front-rear direction of the side member. The member can be set to a constant height. Further, according to the present invention, it is possible to obtain the air suspension device in which the air spring can be attached without making a hole in the flange surface of either the bottom surface or the upper surface of the side member. It has various remarkable effects.

[Brief description of drawings]

FIG. 1 is a side view (A) of a main part and a plan view (B) showing a fixing structure of an air spring and a side member used in FIG.

FIG. 2 is a perspective view showing a rear wheel steering device according to an embodiment of the present invention,

FIG. 3 is a front view of the main part of FIG.

FIG. 4 is a plan view of an essential part of FIG.

5 (A), (B) and (C) show a fixing structure of an air spring and a side member according to a conventional technique.

[Explanation of symbols]

2 Rear axle housing 3 Steering center fixing rod 5 Steering rod 4 Rear wheel steering actuator 13 Side member 11 Air spring 40 Bracket

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Komei Hayashida 5-3-8 Shiba, Minato-ku, Tokyo Inside Mitsubishi Motors Corporation (72) Shozo Kawazawa 5-33-8 Shiba, Minato-ku, Tokyo No. Mitsubishi Motors Corporation

Claims (1)

[Scope of utility model registration request] 1. A side wall surface vertically rising from a bottom surface,
A suspension air comprising a side member that constitutes a chassis frame and a bracket attached to the upper surface side of the air spring, wherein the bracket is fixed to the side member side wall surface in a state of not contacting the side member bottom surface. Spring mounting structure