JP2525779Y2 - Height adjustment mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention relates to a vehicle height adjusting mechanism used for a vehicle or the like.

(Prior Art) Conventional vehicles and the like are provided with a shock absorber having a vehicle height adjusting mechanism between a vehicle body and wheels, for example, so that the vehicle height can be adjusted. As such a shock absorber, for example, a piston rod is inserted into the outer tube from above, and a piston that is in sliding contact with the inner peripheral surface of the cylinder is attached to the distal end of the piston rod. A cylinder is integrally formed, and a plunger is slidably fitted between the outer peripheral surface of the outer tube and the inner peripheral surface of the cylinder, and an under spring seat is mounted on the plunger. Is equipped with an upper spring seat, a suspension spring is interposed between the under spring seat and the upper spring seat, and a stopper rubber is attached to the upper end of the piston rod to supply hydraulic oil to the hydraulic chamber. As a result, the underspring moves upward, increasing the vehicle height and discharging hydraulic oil from the hydraulic chamber. Under spring seat by that there is that as the vehicle height is lowered by downward.

A jack cylinder is provided on the upper side of the upper spring seat. A plunger is slidably fitted in the jack cylinder, and hydraulic oil is supplied to the hydraulic chamber in the jack cylinder, so that the upper spring seat moves up and down. There is one that can adjust the vehicle height.

(Problems to be Solved by the Invention) In the shock absorbers described above, the vehicle height is adjusted by moving the under spring seat or the upper spring seat and moving the spring seat by hydraulic pressure or the like. Since the cylinder is incorporated, the dimension is restricted and the vehicle height adjustment width is reduced. In the case of the latter shock absorber, when the vehicle height is increased, the damper stroke is reduced.

(Means for Solving the Problems) In order to solve the above problems, the present invention provides an L-shaped crank that is swingably mounted on a vehicle body, and an upper end of a shock absorber is mounted on one arm of the L-shaped crank. The lower end of the push rod is attached to the vehicle body, the other end of the L-shaped crank is attached to one end of a push rod that expands and contracts by hydraulic pressure, and the other end of the push rod is attached to the knuckle on the wheel side. And were arranged in an approximately figure eight via an L-shaped crank.

(Operation) By providing a crank on the upper part of the shock absorber and enabling the crank to swing, the direction of the force applied to the shock absorber and the push rod is changed, so that the upper arm between the vehicle body side and the wheel side,
The push rod can be provided in the dead space surrounded by the lower arm, the overall length of the push rod can be increased, the stroke amount of the push rod can be increased, the vehicle height adjustment amount can be increased, and the shock absorber can be provided. Can be maintained.

(Embodiment) An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a schematic view around a suspension having a vehicle height adjusting mechanism according to the present invention, FIG. 2 is a cross-sectional view of a push rod of the suspension, and FIG. 3 is an operation diagram of the vehicle height adjusting mechanism according to the present invention. is there.

An upper arm 3 and a lower arm 4 are interposed between a knuckle 2 attached to the wheel 1 and a vehicle body (not shown),
A crank 6 is pivotally supported on a shaft 5 attached to the vehicle body, and an upper portion of a piston rod 7a of a shock absorber 7 with a suspension spring is pivotably mounted on a shaft 6b at an end of an arm 6a formed on the crank 6. Then, the lower portion of the cylinder 7b of the shock absorber 7 is swingably attached to the vehicle body. Further, the cylinder 11 end 11a of the push rod 8 is swingably mounted on the shaft 6d of the arm 6c formed on the crank 6, and the rod end 14 end 14 of the push rod 8 is mounted on the lower arm 4 mounting portion 2a of the knuckle 2.
a is swingably mounted.

The push rod 8 expands and contracts by hydraulic pressure, and slidably fits a piston 12 in a cylinder 11 to define oil chambers S1 and S2. A rod 13 is screwed onto the piston 12. A rod end 14 is screwed onto the rod 13, and a rod guide 15 that is in sliding contact with the outer peripheral surface of the rod 13 is fitted on the inner peripheral surface of the open end of the cylinder 11. A bellows-shaped dust cover 16 is mounted between the tip end of the dust cover 13 and the tip end of the dust cover 13.

Further, plugs 17 and 18 and tubes 19 and 20 are attached to the side of the cylinder 11 to guide hydraulic oil to the oil chambers S1 and S2.

Next, the operation of the above-described vehicle height adjusting device will be described.

In FIG. 1, for example, when the wheel 1 climbs over a convex portion of the road surface during traveling, the impact from the road surface is transmitted to the wheel 1, the knuckle 2, the push rod 8, and the crank 6, and the arrow in FIG. As shown in the figure, the crank 6 swings around the shaft 5, the total length L1 of the shock absorber 7 with the suspension spring is reduced, and the shock is absorbed.

First, by supplying hydraulic oil to the oil chamber S1 in the cylinder 11 of the push rod 8, the piston 12 moves in the direction indicated by the arrow A in FIG. 2, so that the rod 13 also moves in the same direction.
The push rod 8 extends to increase the overall length. In FIG. 3, the overall length L2 of the push rod 8 increases, and accordingly, the lower arm 4 (and the upper arm 3) swings around the axis 4a (and the axis 3a) as shown by the arrow, and the knuckle 2 and the wheel Since the vehicle 1 also descends, the vehicle body rises and the vehicle height increases.

On the other hand, the oil chamber in the cylinder 11 of the push rod 8
By supplying hydraulic oil to S2, the piston 12
Since the rod 13 moves in the direction indicated by the arrow B in the drawing, the rod 13 also moves in the same direction, and the push rod 8 contracts to shorten the overall length. Therefore, contrary to the above, the upper arm 3 and the lower arm 4 swing upward, and the vehicle height decreases. In this case, since the push rod 8 is provided in a space surrounded by the upper arm 3 and the lower arm 4 between the vehicle body side and the wheel 1 side, the entire length of the push rod 8 can be increased,
Since the stroke amount of the push rod 8 can be increased, the vehicle height adjustment amount can be increased, and the vehicle height can be instantaneously changed by hydraulic pressure. Further, by setting a lever ratio change such that a predetermined spring constant is obtained with respect to a change in the overall length of the push rod 8, the lever ratio changes due to a change in the overall length of the push rod 8, and the vehicle height is changed. The spring constant changes automatically at the same time as the change, so that ride comfort and steering stability according to the vehicle height can be obtained.

The push rod 8 applies, for example, hydraulic pressure to the oil chamber S1 of the push rod 8 described above, but does not supply the hydraulic oil to the oil chamber S2, but drains the hydraulic oil in the oil chamber S1 and operates the hydraulic oil depending on the vehicle weight. May be returned to the reservoir tank. At the same time, the spring constant of the suspension can be varied.

(Effects of the Invention) As described above, according to the present invention, the L-shaped crank is swingably mounted on the vehicle body, the upper end of the shock absorber is mounted on one arm of the L-shaped crank, and the lower end of the shock absorber is mounted on the arm. By attaching one end of a push rod which expands and contracts hydraulically to the other arm of the L-shaped crank on the other side of the L-shaped crank, and attaching the other end of this push rod to the knuckle on the wheel side, the shock absorber and the push rod are connected to each other. Since it is arranged in a figure of eight through a figure crank, it is possible to provide a push rod in the dead space surrounded by the upper arm and the lower arm between the vehicle body side and the wheel side, increasing the overall length of the push rod And the push rod stroke can be increased, and the vehicle height adjustment amount can be increased.
Since the space occupying the upper portion of the shock absorber 7 can be reduced for the vehicle height adjusting mechanism, the overall length of the shock absorber 7 can be increased, and the effective stroke amount of the shock absorber can be maintained.

[Brief description of the drawings]

FIG. 1 is a schematic view around a suspension provided with a vehicle height adjusting mechanism according to the present invention, and FIG. 2 is a sectional view of a push rod of the suspension. FIG. 3 is a diagram for explaining the operation of the vehicle height adjusting mechanism according to the present invention. In the drawings, 1 is a wheel, 2 is a knuckle, 3 is an upper arm, 4 is a lower arm, 6 is a crank, 6a is one arm (arm), 6c is the other arm (arm), and 7 is a shock absorber (suspension). 7a is upper end (piston rod), 7b is lower end (cylinder), 8 is push rod, 11 is cylinder, 11a is one end (end), 12 is piston, 13 is rod, and 14 is rod end , 14a is the other end (end), 15 is a rod guide, and S1 and S2 are oil chambers.

Claims (1)

(57) [Scope of request for utility model registration] 1. An L-shaped crank is swingably mounted on a vehicle body,
The upper end of the shock absorber is attached to one arm of the L-shaped crank, the lower end of the shock absorber is attached to the vehicle body side, and one end of a hydraulically extensible push rod is attached to the other arm of the L-shaped crank. A vehicle height adjusting mechanism, wherein the other end of the push rod is attached to a knuckle on the wheel side, so that the shock absorber and the push rod are arranged in an approximately figure eight shape via an L-shaped crank.