JPS6024994Y2 - Strength adjustment mechanism of twin torsion rubber spring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mechanism for adjusting the strength of a spring system of a shock absorber or vibration isolator equipped with so-called "Neidhardt" type torsion rubber springs.

Various shock absorbers are used in the driver's seats of heavy trucks or construction machines operated on uneven terrain, and coil springs are mainly used in these shock absorbers.

On the other hand, driver fatigue can be reduced by changing the strength of the spring depending on the driver's weight or the unevenness of the uneven terrain.

Therefore, it is desirable for this type of shock absorber to be able to easily adjust the strength of the spring, and although some adjustment machines are used when using the above-mentioned coil springs, the vibration-proofing effect can be achieved with conventional coil springs. In order to obtain this, a separate device is required to absorb and attenuate vibration energy at the same time, and coil springs, whose coil diameter changes greatly during use, are not suitable for absorbing torsional energy.

The "Neidhardt" type torsion rubber spring has a simple structure and is suitable for absorbing torsional energy, but conventional shock absorbers using this type of spring lack an appropriate device to adjust the strength of the spring. Ta.

The present invention meets the above requirements and provides a machine that can easily adjust the strength of a twin Neidhardt type torsion rubber spring device.

Neidhardt type torsion rubber spring devices generally have a hollow prismatic member as an outer frame, a rectangular mandrel is placed around the center of the frame with a 45° rotation, and round rubber rods made of special rubber are press-fitted into the spaces at the four corners. It is formed by

A link arm is fixed to this outer frame, and when the link arm is rotated with respect to the mandrel, the cross-sectional shape of the rubber rod deforms, thereby generating rotational torque.

The present invention will be explained below with reference to the accompanying drawings.

FIG. 1 is a schematic side view showing a state in which the mechanism of the present invention is applied to a shock absorber below the driver's seat.

As shown in the partially sectional front view of FIG. 2, the mechanism of the present invention is applied to a shock absorbing device in which three Neidhardt type torsion rubber spring devices are connected in series.

In the illustrated embodiment, the shock absorbing device is configured as a coupled spring system consisting of a first spring device 1 as a central rubber spring device and second spring devices 2 and 3 as rubber spring devices on both sides. A common shaft 4 is used in the device.

The common shaft 4 usually has a square mandrel 5 as shown in FIG.
The shaft 4 is inserted and fixed into the center hole 5a of the shaft 4, and relative rotation with the core metal 5 is prevented.

The common shaft 4 has ends 4a, 4b of generally circular cross section, which are rotatably supported on side walls 16 of the frame 15.

Each end portion 4a, 4b passes through a hole formed in the side wall 16, and an E IJ song 1a, 21b is attached to the outside of the hole to prevent the shaft 4 from falling off.

The rod-shaped rubber 6 is press-fitted into the four corner spaces between the outer frame 7 and the mandrel 5.

Link arms 8 forming part of the shock absorbing device are fixed to the outer frames of the second spring devices 2 and 3 on both sides.

When this arm receives an external force in the direction P in FIG. 3, this external force is absorbed as a change in the cross-sectional shape of the rubber bar 6, and the buffering function of the spring device is exerted.

As shown in FIGS. 2 and 3, a protrusion plate 9 is fixed horizontally to the center of the front surface of the outer frame 7 of the first spring device 1, and a spherical receiving portion 18 is formed.

A driving member 13, which is a wedge-shaped block, is slidably arranged in the center of the bottom wall of the frame 15, and this block has an inclined surface 11, and this screw hole 12 is formed parallel to the common axis 4. includes a threaded adjusting rod 17 having a knob 10;
is screwed in, and this rotation moves the drive member 13 left and right in FIG.

A hard ball 14 is arranged between the inclined surface 11 of the drive member 13 and the protruding plate 9, and a part of the upper part of this ball is fitted into a receiving part 18 of a spherical recess formed on the bottom surface of the protruding plate 9. Since the rotation of the knob 10 causes the drive member 13 to move.

When adjusting the strength of the torsion rubber spring system, the horizontal movement of the drive member 13 causes the vertical movement of the projection plate 9 via the ball 14, and therefore the outer frame of the first spring device 1 shown in FIG. 7 small angle rotational motion.

The deformation of the rubber rod 6 caused by this rotation is not limited to only the first spring device, but also the rubber rods 6 of the second spring devices 2 and 3 on both sides.
This stress also occurs in the two second spring devices 2,
Since the impact force is generated dispersedly in the rubber 6 of No. 3, the spring strength of the entire spring system can be varied within a wide impact force absorption range.

A stopper 19 fixed to the outer frame 7 of the second spring device 2, 3
comes into contact with the end of the L-shaped member 20 of the frame 15, so
Preliminary deformation is given to each rubber spring by adjusting the knob 10, and this deformation is held by the stopper 19, so that the strength of the entire spring system can be changed to an optimum value according to the weight of the driver.

Further, since the driving member 13 can be moved while the inclined surface 11 and the ball 14 are in contact with each other, adjustment can be made very easily by applying a small rotational force to the knob 10.

The series-connected rubber system using the first and second spring devices 1.2.3 has the advantage that the spring constant can be reduced.

As described above, the present invention provides a novel mechanism for a twin Neidhardt rubber spring device that is extremely easy to operate and allows precise adjustment.

[Brief explanation of the drawing]

Fig. 1 is a schematic side view of a shock absorber equipped with a twin Neidhardt rubber spring device equipped with the mechanism of the present invention; Fig. 2 is a partially sectional front view of the shock absorber; 2 is a side view taken in the direction of the arrow along line A-A in FIG. 2; FIG. 4 is a perspective view of the shaft. 1, 2.3... Spring device, 4... Common shaft, 5... Mandrel, 6... Rod-shaped rubber, 7
...Outer frame, tail ...Link arm, 9...
...Protrusion plate, 10...Knob, 11...
... Inclined surface, 13 ... Drive member, 14 ...
...Hard ball, 15...Frame, 16...
...Side wall, 17...Threaded rod, 18...
... Ukebe.

Claims (1)

[Claims for Utility Model Registration] (1) The first spring device and the second spring device 2, 3 are connected to a common shaft 4
supported on the first and second spring devices 1.2, 3,
Each has a rubber 6 that contacts a rectangular mandrel 5 provided on a common shaft 4, and an outer frame 7 surrounding the rubber 6, and the common shaft has an end portion 4a rotatably supported by a frame 15;
4b, a link arm 8 is fixed to the outer frame 7 of the second spring devices 2 and 3, and a link arm 8 is fixed to the outer frame 7 of the first spring device 1.
is provided with a receiving part 18, and the receiving part 18 is moved in accordance with the movement of the driving member 13 of the adjustment device, and the driving member 13 has an inclined surface 11 and extends in the longitudinal direction of the inclined surface 11. Strength adjustment of a multi-plate rubber spring device, characterized in that it is movably supported by a frame 15, and a stopper 19 that contacts the frame 15 is provided on the outer frame 7 of the second spring device 2, 3. mechanism. (2) The receiving portion 18 is connected to the drive member 13 via the hard ball 14. Utility model registration claim No. (1)
Strength adjustment mechanism of the twin torsion rubber spring device described in Section 1. (3) The strength adjustment mechanism for a coupled torsion rubber spring device according to claim (1), wherein the second spring devices 2 and 3 are arranged on both sides of the first spring device 1. (4) No. 1 and No. 2 above. The spring devices 1.2.3 each have four rubbers 6 in contact with the rectangular mandrel 5. The strength adjustment mechanism of the continuous plate rubber spring device according to claim (1) of the registered utility model. (5) The driving member 13 of the adjustment device is screwed to a threaded rod 17 fixed to the knob 10, and the threaded rod 17 is
A strength adjustment mechanism for a multi-plate rubber spring device as set forth in claim (1) or (2) of the utility model registration claim, which is rotatably supported by a frame 15.