JP2500962Y2 - Push rod - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a push rod used in a vehicle height adjusting mechanism of 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.

In addition, a jack cylinder is provided above the upper spring seat, the plunger is slidably fitted in the jack cylinder, and hydraulic oil is supplied to the hydraulic chamber in the jack cylinder to move the upper spring seat up and down. There is one that allows you to adjust the vehicle height.

(Problems to be Solved by the Invention) In any of the above-mentioned shock absorbers, the under spring seat or the upper spring seat is moved to move the spring seat by hydraulic pressure or the like to adjust the vehicle height. Since the cylinder is incorporated, it is dimensionally restricted to reduce the vehicle height adjustment range. In the latter case, when the vehicle height is increased, the damper stroke is reduced.

Therefore, it is conceivable to use a push rod that expands and contracts by hydraulic pressure as the push rod of the suspension. In this case, both ends of the push rod are attached to the vehicle body side and the wheel side. Is difficult.

(Means for Solving the Problems) In order to solve the above problems, the present invention is configured such that a rod, which is slidably fitted to an inner peripheral surface of a cylinder of a push rod, is screwed so that the rod can advance and retreat, and further, both surfaces of the piston are attached. A thrust bearing was mounted, and a bearing receiving portion that abuts the thrust bearing was provided inside the cylinder and at the end of the rod guide.

(Operation) Since the rod is screwed so that it can move forward and backward with respect to the piston, it is possible to rotate the piston with the push rod attached and adjust the entire length of the push rod. Since it comes into contact with the bearing receiving portion inside the cylinder and at the end portion of the rod guide, the piston can be easily rotated even if axial pressure due to hydraulic pressure is applied.

(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 equipped with a push rod according to the present invention, FIG. 2 is a sectional view of the push rod, and FIG. 3 is an enlarged sectional view of a main part of the push rod.

Upper arms 3, 3 and lower arms 4, 4 are interposed between the knuckle 2 attached to the wheel 1 and the vehicle body side (not shown),
A crank 6 is swingably supported by a shaft 5 on the vehicle body side, and a shock absorber 7 with a suspension spring is provided between the crank 6 and the wheel side. Further, the crank 6 and the knuckle 2 are connected. A push rod 8 that expands and contracts by hydraulic pressure is interposed between them.

The push rod 8 has a piston 12 inside a cylinder 11.
Is slidably fitted to define oil chambers S1 and S2, a piston rod 13 is screwed to the piston 12, and an end 13a of the piston rod 13 is formed to have a width across flats. .

A rod end 14 is screwed to the piston rod 13, fixed with a cap nut 15 and a lock nut 16, and the lock nut 16 is loosened to allow the rod 14 to advance and retract with respect to the piston rod 13, that is, the piston 12. .

A rod guide 17 is slidably contacted with the outer peripheral surface of the piston rod 13 on the inner peripheral surface of the opening end of the cylinder 11, and further between the outer peripheral surface of the opening end of the cylinder 11 and the tip of the piston rod 13. A bellows-shaped dust cover 18 is attached.

A thrust bearing 22 having a surface coated with Teflon 21 is attached to the tip of the piston 12 with a washer 23 and a stopper ring 24, and a thrust bearing 26 similar to the thrust bearing 22 is attached to the rear end of the piston 12.
Is mounted by means of a washer 27 and a stopper ring 28, and a protrusion that abuts the thrust bearing 22 is formed in the cylinder 11 to form a bearing receiving portion 31. The bearing receiving portion 32 is formed smaller than the outer diameter of the bearing. Further, plugs 33, 34 and tubes 35, 36 are attached to the side portions of the cylinder 11 in order to guide the hydraulic oil to the oil chambers S1, S2.

The end of the cylinder 11 of the push rod 8 is attached to the crank 6, and the end of the rod 14 is attached to the knuckle 2.

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

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 of arrow A in FIG. 2, so the piston rod 13 and the rod end 14 also move in the same direction. As a result, the push rod 8 extends and the entire length increases. Therefore, the crank 6 swings in the direction of the arrow in FIG. 1 to increase the vehicle height.

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 moves to the second
Since it moves in the direction of arrow B in the figure, the piston rod 13 and the rod end 14 also move in the same direction, and the push rod 8
Shrinks and shortens the overall length. Therefore, the crank 6 swings in the direction opposite to the direction shown by the arrow in FIG. 1 to lower the vehicle height.

In this case, since the vehicle height is adjusted by the push rod, the vehicle height adjustment amount can be made large and the vehicle height can be instantaneously changed by the hydraulic pressure. Further, by setting the lever ratio change so that a predetermined spring constant can be obtained with respect to the change in the entire length of the push rod 8, the lever ratio changes due to the change in the entire length of the push rod 8,
The spring constant changes automatically as the vehicle height changes, and the ride comfort and steering stability according to the vehicle height can be obtained.

Here, in order to finely adjust the entire length of the push rod 8,
Loosen the lock nut 16, apply hydraulic pressure to the oil chamber S2, and
The thrust bearing 22 of 12 is brought into contact with the bearing receiving portion 31, or the thrust bearing 26 of the piston 12 is brought into contact with the bearing receiving portion 32 by applying hydraulic pressure to the oil chamber S1. Since the end portions of the cylinder 11 and the rod end 14 are fixed by rotating the piston 12 together with the piston rod 13 by applying a spanner or the like to the end portion 13a of the rod end 14, the rod end 14 is opposed to the piston rod 13. The push rod 8 changes its overall length.

At this time, the thrust bearing 22 or 26 of the piston 12
Is in contact with the bearing receiving part 31 or 32.
The piston rod 13 can be easily rotated even if the hydraulic pressure is applied to S1 or S2 and the axial force is applied to the piston 12.

(Effect of the Invention) As described above, according to the present invention, since the rod is screwed to the piston that is slidably fitted on the inner peripheral surface of the cylinder of the push rod so that the rod can be moved forward and backward, the piston can be mounted with the push rod attached. The total length of the push rod can be adjusted by rotating the rod.At this time, thrust bearings are mounted on both sides of the piston, and the bearing receiving portion that contacts the thrust bearing is provided inside the cylinder and at the end of the rod guide. The piston can be easily rotated even if axial pressure by hydraulic pressure is applied, and the total length can be easily fine-tuned with the piston rod attached.

[Brief description of drawings]

FIG. 1 is a schematic view around a suspension equipped with a push rod according to the present invention, FIG. 2 is a sectional view of the push rod, and FIG. 3 is an enlarged sectional view of a main part of the push rod. In the drawings, 1 is a wheel, 2 is a knuckle, 6 is a crank,
8 is push rod, 11 is cylinder, 12 is piston, 13
Is a piston rod, 14 is a rod end, 16 is a lock nut, 17 is a rod guide, 22 and 26 are thrust bearings, 3
1,32 are bearing receiving parts.

Claims (1)

(57) [Scope of utility model registration request] Claim: What is claimed is: 1. A push rod which is provided between a crank on the vehicle body side and a knuckle on the wheel side to expand and contract by hydraulic pressure. In this push rod, a piston is slidably fitted in a cylinder to form an oil chamber. And a rod guide for guiding the rod is fitted to the inner end of the cylinder, and thrust bearings are mounted on both sides of the piston. A push rod characterized in that a bearing receiving portion that abuts on the thrust bearing is provided inside and on an end portion of the rod guide.