JPS59212547A - Shock absorber - Google Patents

Abstract

PURPOSE:To form a machine device in a small size, by absorbing a shock of inertia force of a reciprocating machine element in a position of its both left and right waving end points. CONSTITUTION:If a moving structure, to which an external cylinder 10 is secured, approaches one end point of the movement, the end part of a piston rod 18 collides against a stopper to stop, and a piston 28, while releasing damping oil 16 in an internal cylinder 24 with prescribed small resistance from a clearance 32 between the internal cylinder and the piston, moves in the internal cylinder 24 till the piston collides against an internal wall face to stop. Successively pressing the internal cylinder 24 by the piston 28, the internal cylinder 24, while releasing damping oil 16 in the external cylinder 10 with prescribed resistance from a clearance 26, moves in the external cylinder 10. While if the moving structure approaches a position of the other final end of its movement, the other end part of the piston rod 18 collides to be adapted to a stopper, performing the action similar to the above.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a shock absorber, and more particularly, to a shock absorber.
The present invention relates to a shock absorber that can smoothly and effortlessly relieve the impact at both road point positions of a reciprocating element.

Generally, in a mechanical device, an element that moves along a predetermined trajectory is
If you want to temporarily stop the element at the end of its movement path, especially if the element is heavy or has a high inertia, it is necessary to install a stopper at the end of the movement path and absorb the kinetic energy of the element. A shock absorber is provided to soften the shock of the element hitting the stopper.

However, conventional shock absorbers can only relieve the inertial force in one direction of the element.
For elements that move back and forth, it is necessary to install separate solenoid absorbers at both points of the movement path, which takes up space, prevents downsizing of mechanical equipment, and increases costs. There is.

In addition, conventional shock absorbers absorb the kinetic energy of the element by applying equal kinetic resistance to the element from the time the element contacts the shock absorber until it hits the stopper. When the element comes into contact with the shock absorber, it receives a considerable impact force, reducing the value of the shock absorber by half.

The present invention has been made in view of the above-mentioned problems, and its purpose is not only to determine the end point position of one of the reciprocating elements, but also to
In addition to being able to relieve the inertial force at both road point positions, the element contacts the shock absorber, giving a gentle motion resistance to the element at first, and gradually increasing the motion resistance as it comes into contact with the shock absorber. The piston rond is slidably provided at both ends of the outer cylinder by penetrating it along the axial direction of the outer cylinder, which is filled with buffer oil to minimize the impact force applied to the elements. Each inner cylinder has a single or multiple structure inner cylinder, in which the inner cylinder is independently sealed with buffer oil. The buffer oil contained in the outer cylinder or the inner cylinder is provided so that it can be moved back and forth in the axial direction of the outer cylinder while releasing it in the opposite direction to the traveling direction with a predetermined resistance force, and the inside of each inner cylinder is communicated with the inner cylinder. The piston rod of the outer cylinder is slidably inserted in the axial direction of the inner cylinder, and the buffer oil stored in the inner cylinder is inserted into the piston rod of the innermost cylinder, which is different from the above inner cylinder. To provide a shock absorber characterized in that a piston is fitted which reciprocates in the axial direction of an innermost cylinder while releasing the force in a direction opposite to the traveling direction with a predetermined resistance force.

Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a shock absorber of the present invention, with 10
is, for example, a cylindrical external cylinder, and the external cylinder 10
Both ends of the camp 14a are connected via O-rings 12 respectively.
and 14b, and the inside of the external cylinder 10 is filled with buffer oil 16. A long piston rod 18 extends along the central axis of this external cylinder 10.
is slidably inserted through the outer cylinder 10, and its both ends protrude outward from the outer cylinder 10.

In order to prevent the buffer oil 16 in the external cylinder from leaking out from the sliding surfaces of the camps 14a and 14b at both ends of the external cylinder through which the piston rod 18 is penetrated, a cap metal 20a is provided around the piston rod on the outside end surface of the camps. and 20b are sealed with a gasket 22 pressed. Inside the external cylinder IO, for example, there is an internal cylinder 2 with a single-layer structure, in which both ends are sealed, and a buffer oil 16 is also sealed inside the external cylinder, independently of the external cylinder.
4 moves the buffer oil 16 in the outer cylinder 10 outside the inner cylinder in the traveling direction with a predetermined resistance force, for example, from a small gap 26 between the outer circumferential surface of the inner cylinder 24 and the inner circumferential surface of the outer cylinder 10. It is housed so as to be able to reciprocate in the axial direction of the outer HUIX cylinder 10 while escaping into the outer cylinder in the opposite direction, and the above-mentioned screw rod 18 is slidably inserted onto the central axis of the inner cylinder 24. ing.

Furthermore, the piston rod 1 inside the internal cylinder 24 described above
For example, a disc-shaped screw I/N 28 is attached to the retaining pin 30 at 8.
and is fitted into position via the inner cylinder 24
From the gap 32 between the inner circumferential surface of the inner cylinder and the outer circumferential surface of the piston, the buffer oil 16 is introduced into the inner cylinder in the direction opposite to the traveling direction from the inner cylinder 24 with a predetermined weak resistance force. It is housed so that it can reciprocate in the axial direction within the internal cylinder 24 while releasing the air.

The shock absorber having the above configuration is used, for example, at the end points of the left and right paths of a mechanism in which the iron 40 shown in FIG. When used to soften the impact force, for example, it can be moved parallel to the movable body 42 along a fixed guide block 46, which has elastic bodies 44a and 44b such as rubber fixed to both end faces that slidably sandwich the outer surface of the movable body 42. The external cylinder 1o of the shock absorber is fixed to the outer cylinder 1o of the shock absorber, and a piston rod 18 protrudes outward from the external cylinder 1o of the shock absorber at both left and right movement end points of the moving body 42.
Stoppers 48a and 48b are fixedly provided to abut and stop the ends of. When the movable body 42 moves forward and approaches one end of its movement, the end of the piston rod 18 of the shock absorber first hits the stopper 48b, and the piston 28 in the shock absorber moves toward the inner cylinder 24.
It moves inside the internal cylinder 24 while releasing the buffering oil 16 inside into the internal cylinder in the opposite direction to the traveling direction with a predetermined weak resistance through the gap 32 between the internal peripheral surface of the internal cylinder and the external peripheral surface of the piston. As the piston rod 18 hits the stopper 14b, it retreats inward to the outer cylinder 10 while being subjected to a weak resistance, and hits one inner wall surface of the inner cylinder 24. Then, the inner cylinder 24 is subsequently pushed by the piston 28, and the buffer oil 16 in the outer cylinder lo is advanced through a small gap 26 between the inner circumferential surface of the outer cylinder and the outer circumferential surface of the inner cylinder with a predetermined resistance. The stopper 14b moves inside the external cylinder 10 while escaping into the external cylinder in the opposite direction.
The piston rod 18 on the side that struck the cylinder further retreats inward of the external cylinder 10 while receiving a predetermined resistance, and eventually the elastic body 44b on the end surface of the guide block fixed to the stopper 48b
comes to a stop, and the moving body 42 stops.

In addition, the moving body 42 moves backward and approaches the other end of movement,
When the moving body 42 hits the stopper 48a and stops, the piston rod 18 of the shock absorber hits the stopper 48a and the movable body 42 initially receives stumbling resistance from the shock absorber. The kinetic energy of the movable body 42 is absorbed by the shock absorber while being subjected to resistance, and the elastic body 44a on the end face of the fixed guide block hits the stopper 48a, and the movable body 42 stops.

In the above-mentioned embodiment, the internal fringe 24 has a multilayer structure in which the buffer oil 16 is individually sealed, and each internal cylinder of this multilayer structure is independently housed in an external cylinder or an internal cylinder outside the internal cylinder. The buffer oil 16 is provided so that it can reciprocate in the axial direction of the outer cylinder while releasing it in the opposite direction to the traveling direction with a predetermined resistance that is slightly different in stages, and the inside of each inner cylinder is communicated with each other so that the inner cylinder's axis If the shock absorber of the present invention is constructed by slidably inserting the piston rod 18 in the direction, after the piston 28 moves in the innermost inner cylinder with weak resistance, the outer inner cylinders move in a stepwise manner. The piston rod 18 of the shock absorber moves with the piston 28 while increasing the resistance, and the piston rod 18 of the shock absorber, which has hit the strike collar etc., gradually retreats into the external cylinder 10 while facing strong resistance step by step. It is good that the kinetic energy at the end point of the moving body 42 can be smoothly absorbed.

Further, contrary to the embodiment, the piston 28 is connected to the inner cylinder 24.
Increase the resistance force when moving inside the internal cylinder 24
The resistance force when the shock absorber moves within the outer cylinder 10 may be weakened, and the impact force when the shock absorber first contacts a stopper or the like may be softened by moving the inner cylinder 24.

Furthermore, in the above-mentioned shock absorber, the buffer oil 16 escapes from the piston 28 or the outer peripheral surface of the internal cylinder 24 in the direction opposite to the direction of travel. The buffer oil 1 is extracted from the concave grooves etc. cut on the outer circular surface of the cylinder 24.
The shock absorber of the present invention may be configured such that 6 is released.

As described above, the shock absorber of the present invention can relieve the inertial force of the element at one end position of the reciprocating element (and at both the left and right road point positions), and can be used in mechanical equipment without taking up much space. It can be made smaller.

In addition, the shock absorber of the present invention absorbs the kinetic energy of the element with a weak resistance at first, and then gradually absorbs the kinetic energy from the element with a necessary predetermined resistance force, so that the element absorbs the resistance from the shock absorber. The receiver is not initially subjected to impact force, and has remarkable effects such as being able to absorb the kinetic energy of the element very smoothly and effortlessly.

Although the present invention has been variously explained above with reference to preferred embodiments, the present invention is not limited to these embodiments, and it goes without saying that many modifications can be made without departing from the spirit of the invention. It is.

[Brief explanation of the drawing]

FIG. 1 is a front sectional view of the shock absorber of the present invention, and FIG. 2 is an explanatory diagram showing an example of use of the shock absorber of FIG. 1. 10...External cylinder, 12...0 ring. 14a, 14b... Cap, 16... Buffer oil, 18... Piston rod. 20a, 20b...camp metal, 22...
Packing, 24...Inner cylinder. 26...Small clearance, 28...Piston. 30... Fixing pin, 32... Gap, 40...
Rod, 42...Moving object, j4a. 44b...Elastic body, 46...Fixed guide block, 48a, 48b...Stopper.

Claims (1)

[Claims] 1. A piston rod is slidably provided by penetrating the outer cylinder along the axial direction, and both ends of the screw protrude outward from the outer cylinder. Each inner cylinder is independently housed in an outer cylinder or an inner cylinder outside the outer cylinder, and each inner cylinder has a single or multiple structure in which buffer oil is also independently sealed inside the outer cylinder. It is provided so that it can reciprocate in the axial direction of the outer cylinder while releasing the buffer oil in the opposite direction to the traveling direction with a predetermined resistance force, and the inside of each inner cylinder is communicated so that the piston rond of the outer cylinder is moved in the axial direction of the inner cylinder. The buffer oil contained in the innermost cylinder is inserted into the piston rond in the innermost cylinder in a direction opposite to the traveling direction with a predetermined resistance force different from that of the inner cylinder. A shock absorber is characterized in that a piston is fitted that reciprocates in the axial direction of the innermost cylinder while providing relief.