JPH0130242Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an automobile suspension system using a flexible member such as a wire.

[Prior Art] Japanese Patent Laid-Open No. 51-31414 discloses a suspension system for an automobile that has a relatively simple and lightweight structure and uses a flexible member such as a wire.

As shown in FIG. 4, in this prior art, a pulley 62 and an arm 63 are supported by a common shaft in the chassis, an axle 65 and a pulley 64 are supported at the tip of the arm 63, and the lower side of the pulley 62 and the pulley 64 are supported. The flexible member 6 is stretched over the upper side of 64 in a zigzag manner.
Both ends of 6 are connected to the chassis via springs 61.

When the flexible member 66 is tensed, for example, when the wheels supported by the axle simultaneously run over a step on the road surface, the spring 61 is expanded to apply a force greater than a predetermined amount to the flexible member 66. This prevents scratches.

[Problems to be solved by the invention] However, with only the spring 61, the movement of the flexible member accompanying the movement of the axle becomes large, and vibrations are not damped, so the flexible member may come off the pulley or the loaded object may There is a risk of damage.

Further, a problem arises in the durability of the spring support parts 60, 60a. In particular, since the tension angle α of one spring support portion 60a changes as the axle 65 moves up and down, a special mounting structure is required. in this case,
It is preferable that the spring 61 be a compression spring that is safe against breakage, but if a shock absorber that can accommodate changes in the tension angle α is also provided, the structure of the spring support portion 60a will become even more complicated.

An object of the present invention is to provide an automobile which can effectively absorb shocks acting on a flexible member, suppress sudden and excessive movement of the flexible member, and which has a simple structure in which the movement of the spring is smooth. The purpose of the present invention is to provide a suspension system.

[Means for Solving the Problems] The configuration of the present invention for achieving the above object includes a plurality of first pulleys supported by an axle, disposed above the first pulleys, between the pulleys, and at the front and rearmost portions of the pulleys. A rod connected to an end of the flexible member hanging on the lower side of the second pulley is slidably inserted and supported by a support member having a cylindrical body fixed to the chassis in accordance with the tension angle of the flexible member, and A fixing member having a cylindrical body corresponding to the cylindrical body is fixed to the tip of the rod, a coil spring is interposed between the cylindrical bodies, and a direct acting shock absorber is installed between the fixing member and the support member in parallel with the spring. It is a concatenation of

[Operation] When the flexible member 14 is subjected to an impact force as described above, the coil spring 35 and the direct acting type are connected between the cylindrical bodies 36 and 37 via the fixed member 30 attached to the end of the flexible member By compressing the shock absorber 44, the impact force is effectively absorbed and the tension in the flexible member 14 is maintained substantially constant.

In addition, in this case, the second pulley 15 on the chassis side is arranged between the axles and at the front and rear parts, so the tension angle of both ends of the flexible member 14 is always kept constant, so that the coil spring Only a force parallel to the axial direction of the flexible member 14 acts on the shock absorber 35 and the shock absorber 44, which stabilizes the operation and simplifies the mounting structure to the chassis.

[Example of the invention] The structure of the invention will be explained based on an example.
As shown in Fig. 1, 2 is a palm, and a frame 4
are connected by a horizontal member 5 in the form of a ladder.

Reference numeral 12 denotes a suspension system, in which a plurality of first pulleys 16 are installed directly above the axles 10 and 11, respectively, and are disposed outside the frame 4 and inside the rear wheels 7 and 8. A plurality of second
A flexible member 14 such as a wire or chain is provided in a zigzag pattern, passing above the first pulley 16 and below the second pulley 15, and connecting both ends to a damper device. 13 and is supported on the frame 4.

As shown in FIG. 2, the first pulley 16 is
The second pulley 15 is rotatably supported by brackets 17 fixed directly above the axles 10 and 11 with shafts 26 parallel to the axles, and the second pulley 15 is supported by brackets 18 and 19 fixed to the side surfaces of the frame 4.
It is rotatably supported with a shaft 25.

Each axle 10, 11 is connected by a connecting member 20 of a bracket 18 disposed between them, and a torque rod 29 extending from this in the front-rear direction, and the driving force of each axle 10, 11 is transferred to the torque rod 29. The signal is transmitted to the chassis 2 via the .

In the present invention, as shown in FIG. 3, rods 34 are connected to both ends of the flexible member 14, and the rods 34 are inserted through and supported by a support member 31 having a cylindrical body 36 fixed to the side wall of the frame 4. A coil spring 35 is interposed between the cylindrical body 36 and a fixing member 30 having a cylindrical body 37 coupled to the end of the rod 34, and a direct acting shock absorber is interposed between the fixing member 30 and the support member 31. 44 are connected.

The support member 31 is approximately box-shaped, and is fixed to the side wall surface of the frame 4 with an appropriate fixing means such as a bolt, so as to be inclined in accordance with the tension angle of the flexible member 14. A spring seat 32 is provided at the end of the support member 31 and has a hole 51 through which the rod 34 is inserted.
A cylindrical body 36 for guiding a coil spring 35 described later is connected thereto. On the other hand, Rod 3
A screw shaft 34a is formed at the tip of the screw shaft 34a, into which nuts 39 and 38 are screwed, a hole 52 is bored inside the nut 38, and a fixing member 30 including a spring seat 33 to which a cylindrical body 37 is connected is installed. engaged.
A coil spring 37 is disposed between the cylindrical bodies 36 and 37 so as to surround the rod 34. In addition, 4
0 is volt.

50 is an arm, which is attached to the rod 34 together with the fixing member 30;
The rod 34 is fixed to the rod 34 with nuts 39 and 38, and protrudes to the side of the rod 34. Further, a rod 41 that protrudes laterally is coupled to the side wall of the support member 31, and a direct acting shock absorber 44 is connected between the rod 41 and the arm 50 in parallel with the coil 35.
are connected.

The above-mentioned shock absorber 44 is a widely used direct-acting type, which includes three concentric tubes and a piston.
Consisting of valves, gaskets, etc., the lower ends of the two inner pipes are covered by the outermost dust-proof cylinder, and the lower ends are connected with a relief valve, and the upper ends are sealed. By placing a piston in the cylinder and communicating it with the outermost cylinder, the upper and lower tubes compress and expand, causing energy loss as the oil moves through the relief valve, thereby causing the oil to move through the relief valve. movement of the flexible member can be damped. That is, the mounting member 42 provided at the outer end of the shock absorber 44 is fitted over the rod 41 and tightens and supports the nut 43, while the rod 49 extending from the other end is fitted between the pair of seat plates 45. Elastic member 4
6 is inserted, and one seat plate 45 is abutted against the end wall of the shock absorber 44, and the other seat plate 45 is abutted against the double nut 48 screwed onto the rod 49. It is supported by Then, the engaging member 47 surrounding the outer periphery of the elastic member 46 is coupled to the arm 50 described above.

Next, we will explain the operation of the device of the present invention.
As shown in FIG.
It is alternately spanned between the lower side of the second pulley 15 of the brackets 18, 19 fixed to the axles 10, 11 and the upper side of the first pulley 16 of the bracket 17 fixed to the axles 10, 11, and both ends are attached to the frame 4 as a damper. Since the vehicle body is supported by the device 13, the load of the vehicle body acts to push down the flexible member 14 through the pulley 15, and further acts to push down the bracket 17 through the first pulley 16, so that the axle 10 and 11.

When one of the rear wheels 7, 8, for example, the rear wheel 7 runs onto a bump in the road surface, the axle 10, the bracket 17, and the first pulley 16 are pushed up against the frame 4, thereby reducing the tension angle of the flexible member 14. As θ changes, the bracket 17 and axle 11 are pushed down together with the pulley 16. In this way, both the rear wheels 7 and 8 are maintained in a grounded state, and the load of the vehicle body is applied evenly to the rear wheels 7 and 8.

When the rear wheels 7, 8 suddenly run onto a bump in the road surface, an impact load is applied to the end of the flexible member 14, but the rod 34 connected to the end of the flexible member 14 resists the force of the coil spring 35. The flexible member 14 is temporarily expanded by moving diagonally downward, and the shock absorber 44 absorbs the impact.

When the wheels bounce significantly when driving on a rough road, the rod 34 connected to the flexible member 14 is suddenly pushed up.
The spring seat 33 of the fixing member 30 coupled to the coil spring 35 may separate from the upper end of the coil spring 35, causing hopping of the coil spring 35.

However, in the present invention, the shock absorber 44 is connected between the arm 50 fixed on the spring seat 33 side of the rod 34 and the rod 41 supported on the support member 31 side, so the rod 34 is pushed up as described above. At this time, the sudden and excessive movement of the rod 34 is suppressed by the damping action of the shock absorber 44, and hopping of the spring 35 can be prevented.

[Effects of the invention] As described above, the present invention can be hung on the upper side of a plurality of first pulleys supported by an axle, between those pulleys, and on the lower side of a second pulley disposed at the front and rearmost positions of the plurality of first pulleys. A rod connected to an end of the flexible member is slidably inserted into and supported by a support member having a cylindrical body fixed to the chassis in accordance with the tension angle of the flexible member, and a cylindrical member corresponding to the cylindrical body is attached to the tip of the rod. A fixed member having a body is fixed, a coil spring is interposed between the cylindrical body, and a direct acting shock absorber is connected between the fixed member and the support member in parallel with the spring, so that the flexible member Even when an impact force is applied to the flexible member, since the coil spring and the shock absorber are installed in parallel, the impact force is effectively absorbed, and the tension of the flexible member can be kept almost constant. It is also possible to prevent the member from coming off the pulley.

In addition, in this case, by arranging the second pulley on the chassis side between the first pulley on the axle side and on the frontmost and rearmost sides of the axle, the tension angle or inclination angle of both ends of the flexible member is can be kept constant. Therefore, the rods at both ends of the flexible member only need to be supported so as to be able to slide in the axial direction by fixed members arranged in accordance with the tension angle, and the structure and installation are simple and the operation is smooth. becomes. Further, since the coil spring is disposed between the cylindrical bodies, there is an effect that the coil spring can be smoothly expanded/contracted or moved. Furthermore, since the coil spring and the shock absorber can be installed between the support member and the fixed member, the overall structure can be made compact.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a chassis equipped with a vehicle suspension system according to the present invention, FIG. 2 is a side view of the same device, and FIG.
The figure is a sectional side view of a damper device that supports an end of a flexible member on a frame, and FIG. 4 is a schematic side view of a conventional vehicle suspension system. 2: Chassis, 3: Front wheel, 4: Frame, 5: Lateral member, 7, 8: Rear wheel, 10, 11: Axle, 1
2: Suspension device, 13: Damper device, 14: Flexible member, 15: Second pulley, 16: First pulley,
17-19: Bracket, 25, 26: Axis, 2
9: Torque rod, 30: Fixing member, 31: Supporting member, 32, 33: Spring seat, 34: Rod, 3
5: Coil spring, 38, 39: Nut, 41: Rod, 44: Direct acting shock absorber, 50:
arm.

Claims (1)

[Scope of utility model registration request] A rod connected to an end of the flexible member that hangs between the upper sides of a plurality of first pulleys supported by the axle and the lower side of a second pulley disposed at the front and rearmost portions of the plurality of first pulleys is connected to the flexible member. A supporting member having a cylindrical body fixed to the chassis according to the tension angle is slidably inserted and supported, and a fixing member having a cylindrical body corresponding to the cylindrical body is fixed to the tip of the rod,
A coil spring is interposed between the cylindrical bodies, and
A suspension system for an automobile comprising a direct acting shock absorber connected in parallel with the spring between the fixed member and the support member.