JPS59230813A - Suspension system of vehicle - Google Patents

Abstract

PURPOSE:To make it easy to control the attenuation property, by feeding the oil pressure generated from an actuator in accordance with the operation of a manual operation lever to clamp mechanisms arranged on opposite sides of a laminated spring so as to allow the friction between the leaf springs to be suitably increased. CONSTITUTION:In case when a vehicle travels on a rough road and the friction between the leaf springs of the laminated spring 4 is to be increased, an operation lever 30 is rotated about its axis clockwise, then a power transmitting member 25 is pulled and an oil pressure is generated in an actuator 23. Then the oil pressure is fed to oil pressure chambers 20 of cylinder bodies 10 at clamp mechanisms 7 positioned at opposite sides of the laminated spring 4, so that pistons 15 are pushed down to clamp the leaf springs 15... via a liner 16 to increase the friction between the leaf springs. Therefore the equivalent attenuation factor can be set higher, and the attenuation can be increased. On the other hand, when the vehicle travels on a good road, and a stop mechanism 41 is released, a handle 30 is rotated counterclockwise to release the pressing force of the pistons 15 so that the friction between the leaf springs is lowered.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vehicle suspension system used in a vehicle such as an automobile.

2. Description of the Related Art Vehicle suspension systems are devices that are interposed between a vehicle body and an axle to support the vehicle body, and systems that use stacked leaf springs are conventionally known. In general, the ride comfort and steering stability of stacked leaf springs are affected by the spring constant and the friction between the plates, and the ride comfort while driving on a good road such as a paved road is better when the friction between the plates is small. However, if there is little friction between the plates, the dynamic spring constant will be small, resulting in a problem of poor stability when turning or turning the wheel.

Therefore, for example, as filed in Japanese Patent Application No. 12341/1984, a clamping mechanism is provided on a single-layer leaf spring, and this clamping mechanism is tightened or released (by means of fluid pressure) to change the friction between the plates. was developed by the present inventors. That is, as shown in FIG. 1, a cylinder a for driving the clamp mechanism.

When a pressure fluid supply source such as a hydraulic pump is used, it is composed of a valve device C that switches the hydraulic pressure, a detection section d that detects road conditions, course changes, etc., an operation section e for manual operation, a control section f, etc. It is something that A control signal g corresponding to road surface conditions, vehicle conditions, etc. is then sent to the valve device C.
Fluid pressure is developed in cylinder a, causing the clamping mechanism to operate.

Therefore, the above structure requires a hydraulic pump, valve device, various piping, etc. to drive the cylinder, and also requires a complicated electrical structure such as a sensor and control circuit to output the flange signal, which reduces the cost. However, something with a simple structure was desired.

The present invention has been made based on the above circumstances, and an object of the present invention is to provide a vehicle suspension system that can change the friction between the plates and has a simple structure.

That is, the present invention includes a stacked leaf spring, a clamping mechanism that is provided to tighten the spring plates of the stacked leaf spring to each other in the thickness direction, and a clamping force generated in the clamping mechanism by fluid pressure from an oil man or the like. For example, it is characterized by comprising an actuator such as a cylinder mechanism, an operating lever that manually drives the actuator to generate fluid pressure, and a stop mechanism that can fix the operating lever at a desired operating position. This is a suspension system for a vehicle.

A first embodiment of the present invention will be described below with reference to FIGS. 2 to 5. In FIG. 2, reference numeral 1 indicates a vehicle body, and both ends of a stacked leaf spring 4 are supported on the vehicle body 1 by support members 2 and 3. The stacked leaf spring 4 is made up of a plurality of spring plates 5 stacked one on top of the other in the thickness direction, and its central portion is restrained to an axle-side member 6 via a fastener such as a U-port.

Clamp mechanisms 7, 7 are provided near both ends of the stacked leaf spring 4, respectively.
Since they have the same structure, one will be explained as a representative. As shown in FIG. 3, the cylinder body 10 and the grate 1
Each spring plate 5... is interposed between the spring plate 1 and the spring plate 1. These cylinder body 10 and plate 11 are spaced at 12°1.
Through 2? It is connected by the bolts 13, 13 and the nut 14°14.

A piston 15 is provided in the cylinder body 10. This piston 15 reciprocates in the direction toward and away from the spring plate 5 and in the vertical direction of the tab, and a liner 16 is attached to the lower surface of the piston for temporary protection of the spring. 17 is a dust seal, and 18 is an O-ring.

Further, a hydraulic chamber 20 is formed between the giston 15 and the cylinder body 10, and an oil passage 21 communicates with this hydraulic chamber 20. Therefore, when the piston 15 is pushed down by the hydraulic pressure transmitted through the oil passage 21, the spring plates 5 are tightened together via the liner 16, increasing the friction between the plates, and conversely eliminating the hydraulic pressure. The restraint on each spring plate 5 is released, and the friction between the plates is reduced.

As shown in FIG. 2, an actuator 23 is connected to the oil passage 21. The actuator 23 is generally a cylinder-piston type as shown in Figure 1, but any other mechanism such as a manual hydraulic pump may be used as long as it can generate fluid pressure. good.

Further, an operating lever 30 is connected to the drive section 24 of the actuator 23 via a power transmission member 25 such as a wire cable or rod. This control lever 3
0 is rotatably provided around the shaft 31, has a glyph f32 on one end thereof, and is connected to the power transmission member 25 on the other end. 25a is a guide member.

Further, a support member 34 is fixed by the shaft 31 and the pin 33, and a ratchet receiver 35 is attached to the support member 34.
is formed. The distal end of a ratchet 36 is detachably engaged with the ratchet receiver 35.

This ratchet 36 is rotatable around a pin 37.

The ratchet 36 can be rotated by a drive member 38. An operator 39 is attached to the other end of the drive member 38 so as to be movable in the protruding and retracting direction, as illustrated in FIG. Further, the operating element 39 is always urged in a protruding direction by a return spring 40. These operating elements 39 and drive unit'#a
s, ratchet 36. A strike and f mechanism 4 for fixing the operating lever 30 at a desired position by a support member 34 etc.
It constitutes the no.

In the device of this embodiment configured as described above, when it is desired to increase the friction between the plates of the stacked leaf springs 4, for example when driving on a rough road or changing course, the operating lever 30 is rotated to generate power. The transmission member 25 is pulled to cause the actuator 23 to generate hydraulic pressure.

By doing this, the spring plate 5...
・Since the plates are tightened together, the friction between the plates can be increased. Therefore, the equivalent damping coefficient based on the friction between the plates is set high, and the damping performance is increased, making it suitable for driving on rough roads, making curves, and changing lanes.

On the other hand, if you want to reduce the friction between the plates, such as when driving on a good road, hold the grip 32 and press the operator 39 with your fingers, and release the ratchet 36 and the ratchet holder 35 from each other on the operating handle. 30 counterclockwise as shown in the figure. If the power transmission member 25 is relaxed by this operation, the hydraulic pressure of the actuator 23 is reduced or eliminated, the tightening force by the piston 15 is released, and the friction between the plates can be reduced.

Therefore, the dynamic spring constant is small, and the riding comfort on good roads is improved.

As described above, according to the above-described suspension system, the friction between the plates can be freely changed according to the road surface condition, the vehicle condition, the user's preference, etc., and good riding comfort and excellent steering stability can be ensured.

Moreover, since the actuator 23 is driven by the manual operation lever 30 to generate the tightening force, there is no need for complicated electric circuits, piping structures, signal processing circuits, etc., as shown in Fig. 5. The drive system of the flange mechanism can be greatly simplified. In addition, the ratchet receiver 35
By arbitrarily selecting the locking position of the ratchet 36, any clamping force can be set (4), and the operation is extremely simple.

6 and 7 show a second embodiment of the present invention, in which a friction lock mechanism 4 is used as the stop mechanism 41.
5 is used. The friction lock mechanism 45 includes a cylinder 46 fixed to the vehicle body, a rod 47 extending and contractingly inserted into the cylinder 46, and a rod 47 and a cylinder 46.
A torsion coil spring 48 as a friction body wound between
By twisting the coil spring 48 in the unwinding direction with the operator 49, the diameter of the coil spring 48 expands and the frictional engagement with the rod 47 is released. When the operator 49 is released, the coil spring 4
The rod 47 is frictionally engaged by the tightening force of 8- and can be fixed at any axial position.

The power transmission member 25, such as one end of a push-sol cable, is connected to the port P47 via a connecting member 50. Further, the connecting member 50 is connected to a connecting rod 51.
In conjunction with this, the connecting rod 51 can be pushed or pulled by an operating lever 30 that rotates around the bin 52. Further, a lock release lever 55 is pivotally attached to the operation lever 30. One end of a release cable 56 is connected to the lock release lever 55, and the other end of the release cable 56 is connected to the operator 49 of the friction lock mechanism 45 described above.

In the second embodiment with the above configuration, when the lock release lever 55 is gripped and the operating lever 30 is rotated clockwise in FIG. Towed. Therefore, similar to the one in FIG. 2, hydraulic pressure is generated in the actuator 23 and the flang mechanism 7.7 can tighten the stacked leaf spring 4.

The same effects as in the first embodiment can be obtained.

Then, when the lock release lever 55 is released, the rod 47
is fixed, the power transmission member 25 can be locked.

8 and 9 show a third embodiment of the present invention, in which the actuator 23 and the stop mechanism 4) are integrally constructed using a common cylinder. That is,
Rod 2 connected to piston 23a of actuator 23
3b is wound with a coil spring 48 for friction engagement similar to the friction lock mechanism of the second embodiment shown in FIG.
By operating the operator 49, the mouth and door 23b can be fixed at desired axial positions. The operator 49 is operated by a lock release lever 55 via a release cable 56.

In the third embodiment with the above configuration, the user grasps the lock release lever 55, pulls the release cable 56, operates the operator 49, and rotates the operation lever 30 in the unlocked state. Then, the rod 23 is connected via the connecting rod 51 and the connecting member 50.
b is driven and the piston 23m moves together to generate hydraulic pressure, which is transmitted to the clamp mechanisms 7, 7 through the oil passage 21, and can tighten the stacked leaf springs 4. Furthermore, by operating the operating lever 30 in the opposite direction to the above, the tightening force on the stacked leaf spring 4 can be loosened.

Note that in the third embodiment above, the first embodiment or the second embodiment
For parts common to the embodiments, the same number of books will be given and the explanation will be omitted.

Note that the number of clamp mechanisms is not limited to two, and may be provided at one or three or more locations. Furthermore, in carrying out the present invention, the structure and shape of the operating lever, stop mechanism, clamp mechanism, stacked plate storage actuator, etc. may be modified in various ways without departing from the spirit of the present invention. Needless to say, it can be implemented.

Further, the present invention can also be used in a suspension mechanism for supporting the driver's cab in a vehicle having a cab tilt type driver's cab.

As described above, the present invention uses a manual operating lever and a stop mechanism to generate fluid pressure in the actuator, and this fluid pressure is grooved so that a tightening force is generated in the Franz mechanism. The desired friction between the plates can be obtained according to the user's judgment, and the structure is simple and the flanging operation can be easily performed, so that it has great practical effects.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing a drive system of a conventional clamp mechanism, Figs. 2 to 5 show a first embodiment of the present invention, Fig. 2 is a side view, and Fig. 3 is a block diagram showing the drive system of a conventional clamp mechanism. ◎ Figure 6 shows the second embodiment of the present invention. FIG. 7 is a plan view taken from the direction of the line ■-■ in FIG. 6, FIG. 8 is a side view showing the third embodiment of the present invention, and FIG. 9 is a side view of the stop mechanism shown in FIG. It is a plan view seen from the IX-■ line direction inside. 4... Layered leaf spring, 5... Spring plate, 7... Clamp mechanism, 23... Actuator, 3θ... Operation lever %41... Strike, Zo mechanism. Applicant's Representative Patent Attorney Takehiko Suzue Figure 1 Figure 3 Figure 4 Figure 2 Figure 5

Claims (1)

[Claims] A stacked leaf spring, a clamping mechanism that can tighten the spring plates of the stacked leaf spring to each other in the thickness direction, an actuator that generates a clamping force on the clamping mechanism using fluid pressure, and a manual drive of the actuator. 1. A suspension system for a vehicle, comprising: an operating lever for generating surface pressure; and a stop mechanism capable of fixing the operating lever at a desired operating position.