JP4004427B2 - Vehicle suspension system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a suspension device suitable for supporting a vehicle, particularly a front part of a truck.
[0002]
[Prior art]
Conventionally, as a suspension device of this type, a thin leaf spring has lateral rigidity, an air spring is attached to a substantially central portion of the leaf spring, and a suspension mechanism for a vehicle in which a link mechanism is configured by the leaf spring and a stabilizer. Is known (see, for example, Patent Document 1). In this suspension device, the upper end of the air spring is fixed to the frame, the lower end of the air spring is fixed to the pedestal, and the upper pad, the pedestal, the lower pad, the leaf spring, the spacer, and the front axle are fastened together by a U bolt. In addition, a first arm for holding the torsion bar of the stabilizer and a second arm for attaching the lower end of the shock absorber are extended to the spacer.
In the vehicle suspension apparatus configured as described above, the leaf spring, the torsion bar of the stabilizer, and the shock absorber are integrally attached, so that the parts can be omitted and the weight can be reduced.
[0003]
[Patent Document 1]
JP-A-57-90205 [0004]
[Problems to be solved by the invention]
However, in the vehicle suspension system disclosed in Patent Document 1, many parts, that is, the upper pad, the pedestal, the lower pad, the leaf spring, the spacer, and the front axle are fastened together with the U bolts. There was a problem that a relatively long time was required for positioning.
Further, in the vehicle suspension device disclosed in Patent Document 1, since a torque rod is not installed between the frame and the front axle, if the leaf spring is constituted by a single leaf spring, a windup phenomenon occurs during braking. May occur.
[0005]
An object of the present invention is to provide a vehicle suspension device that can simplify the structure by reducing the number of parts and the number of assembly steps.
Another object of the present invention is to provide a vehicle suspension device that can prevent a wind-up phenomenon from occurring during braking even when the leaf spring is constituted by a single leaf spring.
[0006]
[Means for Solving the Problems]
As shown in FIGS. 1 and 2, the invention according to claim 1 includes a pair of side members 12a extending in the traveling direction of the vehicle and supporting the vehicle body, and in the vehicle width direction below the pair of side members 12a. An axle 13 extended and provided with wheels attached to both ends, a pair of air springs 14 interposed between the pair of side members 12a and the axle 13, and both ends provided extending in the vehicle traveling direction. A pair of leaf springs 16 that are pivotally attached to the pair of side members 12a and whose center is respectively attached to the axle 13, and a front end of the pair of side members 12a that can be pivoted to the pair of side members 12a. A pair of torque rods 23 that are respectively attached and whose rear ends are rotatably attached to the axle 13, and both ends thereof are rotatably attached to the axle 13. A suspension device for a vehicle having a U-shaped stabilizer 24 that is rotatably held by a pair of side members 12a at the center, and a pair of couplings between an axle 13 and a pair of air springs 14. Brackets 19 are respectively interposed, and the connecting bracket 19 is formed on the upper surface of the center to hold the center of the leaf spring 16 and the rear end of the torque rod 23 that protrudes from the upper front end. The vehicle suspension system includes an upper mounting portion 19b for mounting and a lower mounting portion 19c that protrudes from a lower portion of the front end and rotatably mounts an end portion of the stabilizer 24.
[0007]
In the vehicle suspension device according to claim 1, the center of the leaf spring 16 is held by the concave groove 19 a formed on the center upper surface of the connection bracket 19, and the upper mounting is provided so as to protrude from the upper front end of the connection bracket 19. The rear end of the torque rod 23 is rotatably attached to the portion 19b, and the end of the stabilizer 24 is rotatably attached to the lower attachment portion 19c projecting from the lower front end of the connection bracket 19. Thereby, the number of parts for assembling the suspension device 11 can be reduced, and the number of assembling steps of the suspension device 11 can be reduced.
Further, each of the pair of leaf springs 16 may be constituted by a single leaf spring.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 and 2, the suspension device 11 that supports the front portion of the truck includes a pair of side members 12a that extend in the traveling direction of the truck, and a vehicle width direction below these side members 12a. An extended front axle 13, a pair of air springs 14 interposed between the pair of side members 12a and the front axle 13, and a pair of leaf springs 16 extended in the traveling direction of the track. With. The pair of side members 12a are connected by a plurality of cross members (not shown) at predetermined intervals, and the chassis frame 12 is configured by these side members 12a and the cross members. The side member 12a supports a cab (not shown), and a pair of wheels (not shown) are rotatably attached to both ends of the front axle 13.
[0009]
The leaf spring 16 is composed of a single leaf spring. The front end of the leaf spring 16 is rotatably attached to the side member 12a via the front bracket 17, and the rear end of the leaf spring 16 is rotatably attached to the side member 12a via the rear bracket 18 (FIG. 1). . The center of the leaf spring 16 is attached to the front axle 13 via a connecting bracket 19 (FIGS. 1 and 2). The connecting bracket 19 has a concave groove 19a formed in the center upper surface so as to extend in the track traveling direction, an upper mounting portion 19b projecting from the upper front end, and a lower mounting portion 19c projecting from the lower front end. Have. Reference numeral 20 in FIG. 2 is a center bolt for attaching the leaf spring 16 to the connecting bracket 19, and reference numeral 21 is a U bolt for attaching the leaf spring 16 to the front axle 13 via the connecting bracket 19. 2 is a substantially hat-shaped spring pad interposed between the upper surface of the leaf spring 16 and the U bolt 21.
[0010]
On the other hand, a pair of torque rods 23 and a single stabilizer 24 are attached between the pair of side members 12a and the front axle 13 (FIGS. 1 and 2). The torque rod 23 is provided so as to extend in the traveling direction of the track, and the front end of the torque rod 23 is rotatably attached to the side member 12a via the front bracket 17 (FIG. 1). The rear end of the torque rod 23 is rotatably attached to the front axle 13 via the connecting bracket 19 (FIGS. 1 and 2). Specifically, the rear end of the torque rod 23 is rotatably attached to the upper attachment portion 19 b of the connection bracket 19.
[0011]
Further, the stabilizer 24 is formed in a U-shape, and a torsion bar 24a (FIG. 1) provided below the side member 12a and extending in the vehicle width direction, and is connected to both ends of the torsion bar 24a in the traveling direction of the track. A pair of arms 24b (FIGS. 1 and 2) extending. The center of the stabilizer 24, that is, the torsion bar 24a is rotatably held by the pair of side members 12a via the pair of torsion brackets 26 and the front bracket 17 (FIG. 1). Further, both ends of the stabilizer 24, that is, the rear ends of the pair of arms 24b are rotatably attached to the front axle 13 via the connecting bracket 19 (FIGS. 1 and 2). Specifically, the rear ends of the pair of arms 24b are rotatably attached to the lower attachment portion 19c of the connection bracket 19. A pair of shock absorbers (not shown) that absorb vibration from the road surface are provided between the side member 12a and the front axle 13 so as to extend in a substantially vertical direction.
[0012]
A procedure for assembling the truck suspension device 11 configured as described above will be described.
The center of the leaf spring 16 is inserted into the groove 19a of the connecting bracket 19 in advance, the center bolt 20 is inserted through the leaf spring 16 and the connecting bracket 19, and a nut (not shown) is screwed onto the tip of the center bolt 20. Thus, the connecting bracket 19 and the leaf spring 16 are integrated. A front bracket 17 and a rear bracket 18 are fixed to the side member 12a of the chassis frame 12, and an air spring 14 is further attached.
[0013]
First, the chassis frame 12 is turned over, the front end of the leaf spring 16 is attached to the front bracket 17 fixed to the side member 12a of the chassis frame 12, and the leaf spring 16 is fixed to the rear bracket 18 fixed to the side member 12a. Install the rear end. Next, the front end of the stabilizer 24 is attached to the side member 12 a via the torsion bracket 26 and the front bracket 17, and the rear end of the stabilizer 24 is attached to the lower attachment portion 19 c of the connection bracket 19.
[0014]
Next, the front axle 13 is placed upside down on the upper surface (back surface) of the connection bracket 19, and the U bolt 21 is attached to the leaf spring 16 and the front axle with the spring pad 22 in contact with the lower surface (front surface) of the leaf spring 16. The front axle 13 is attached to the connection bracket 19 by being inserted through the screw 13 and screwing a nut (not shown) to the upper end of the U-bolt 21. A hole (not shown) that can be fitted into the front end of the center bolt 20 and the nut is formed in the front axle 13 that faces the front end of the center bolt 20 and the nut. Further, the air spring 14 attached to the side member 12 a is attached to the connection bracket 19.
[0015]
Since the suspension device 11 can be assembled by such a relatively simple operation, the number of assembling steps for the suspension device 11 can be reduced. Further, since each of the pair of leaf springs 16 is constituted by a single leaf spring, the number of parts of the suspension device 11 can be reduced and the weight can be reduced. Here, if the leaf spring 16 is constituted by a single leaf spring, the spring constant of the leaf spring 16 is reduced and a windup phenomenon is likely to occur. However, the windup phenomenon can be prevented by the torque rod 23.
[0016]
In this embodiment, a truck is used as the vehicle. However, a bus or other vehicle may be used.
In this embodiment, the center of the leaf spring is inserted into the concave groove of the connection bracket, but the center of the leaf spring is attached to the lower surface of the connection bracket, and the spring pad and the U bolt are accommodated in the concave groove of the connection bracket. May be.
[0017]
【The invention's effect】
As described above, according to the present invention, a pair of air springs are interposed between the pair of side members and the axle, and a pair of connection brackets are interposed between the axle and the pair of air springs. A concave groove is formed on the central upper surface of the connecting bracket, and an upper mounting portion projects from the upper front end of the coupling bracket, and a lower mounting portion projects from the lower front end of the coupling bracket. The number of parts for assembling the suspension system by holding the center, pivoting the rear end of the torque rod to the upper mounting part, and pivoting the stabilizer end to the lower mounting part of the connecting bracket As well as the number of assembly steps of the suspension device. As a result, the structure of the suspension device can be simplified.
Further, if each of the pair of leaf springs is constituted by a single leaf spring, the number of parts of the suspension device can be further reduced without causing a wind-up phenomenon when the vehicle is braked.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing a main part of a suspension device according to an embodiment of the present invention.
FIG. 2 is a perspective view of a main part of a suspension device including a connection bracket.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 Suspension apparatus 12a Side member 13 Front axle 14 Air spring 16 Leaf spring 19 Connection bracket 19a Groove 19b Upper attachment part 19c Lower attachment part 23 Torque rod 24 Stabilizer

Claims (2)

A pair of side members (12a) that extend in the traveling direction of the vehicle and support the vehicle body;
An axle (13) provided extending in the vehicle width direction below the pair of side members (12a) and having wheels attached to both ends;
A pair of air springs (14) respectively interposed between the pair of side members (12a) and the axle (13);
A pair of leaf springs (16) provided extending in the traveling direction of the vehicle and having both ends rotatably attached to the pair of side members (12a) and the center attached to the axle (13), respectively;
A pair of torque rods extending in the traveling direction of the vehicle and having front ends rotatably attached to the pair of side members (12a) and rear ends respectively attached to the axle (13) so as to be rotatable. 23) and
A suspension system for a vehicle, comprising U-shaped stabilizers (24) each having both ends rotatably attached to the axle (13) and a center rotatably supported by the pair of side members (12a). There,
A pair of connection brackets (19) are interposed between the axle (13) and the pair of air springs (14), respectively.
The connection bracket (19) is formed on the upper surface of the center and has a concave groove (19a) for holding the center of the leaf spring (16), and a rear end of the torque rod (23) that protrudes from the upper front end. An upper mounting portion (19b) for movably mounting and a lower mounting portion (19c) projecting at the lower part of the front end and rotatably mounting the end portion of the stabilizer (24) Vehicle suspension system. 2. The vehicle suspension system according to claim 1, wherein each of the pair of leaf springs (16) is constituted by a single leaf spring.

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