JPH03144105A - Cylinder device - Google Patents

Abstract

PURPOSE:To stop a piston rod at an optimal position by forming a communication hole which introduces liquid to an action chamber in a through-hole by means of a position adjusting member, and providing an abutting stepped part which abuts against a stepped face formed on the thorugh-hole. CONSTITUTION:A piston 13 is slidably fitted to a cylinder hole 9 formed on a cylinder main body 2. A piston rod 14 is projectingly formed on one end of the piston 13, while a through-hole 18 opened to the piston rod side is formed on the other end of the piston 13. When force due to liquid is applied to the piston 13, a position adjusting member in the through-hole 18 is relatively moved, and a stepped face 17A formed on the thorugh-hole 18 of the piston 13 abuts against the a stepped abutting part 23A of the position adjusting member 19 to control the movint rate of the piston 13. The piston rod is thus stopped at an optimal position.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a cylinder device in which a piston that is movable by the pressure of a liquid is inserted.

[Conventional technology]

Conventionally, this type of cylinder device was disclosed in Utility Application No. 63-33424.
It is equipped with a hydraulic pressurized processing machine as shown in the publication, and is used for press fitting, caulking, +J hole drilling, etc., but the piston rod protruding from one end surface of the piston is used when not being processed. Low-pressure rapid traverse is performed during processing, and high-pressure transport is performed during machining.

[Problem that the invention seeks to solve]

However, in the cylinder device of Utility Model Application No. 63-33424, when the piston is press-fitted into the workpiece by the piston rod to an arbitrary press-fitting position, a protrusion formed on the outer periphery of the piston rod is attached to prevent the piston from moving to the end of the stroke. It is necessary to provide a specially provided positioning device to stop the device by contacting the device, which increases the size of the device itself.

The present invention solves these problems and provides a cylinder device that allows the piston rod to be stopped at any position without increasing the size of the device itself.

[Means for solving problems]

Therefore, in the present invention, a piston is provided which is slidably inserted into a cylinder hole formed in a cylinder body, a piston rod is provided to protrude from one end surface of the piston, and the other end surface of the piston extends toward the piston rod. iii) A through hole is provided with an opening, and a position adjustment member is slidably inserted into the insertion hole and screwed onto the cylinder body to form working chambers on both ends of the piston and within the insertion hole to adjust the position. The member is provided with a communication hole through which liquid is led out to the working chamber within the insertion hole, and is also provided with an abutment step portion that comes into contact with a stepped surface formed in the insertion hole.

[For production]

In such a configuration of the present invention, when an acting force of the liquid acts on the piston, the position adjustment member in the insertion hole moves relatively, and the stepped surface formed in the insertion hole of the piston comes into contact with the contact stepped portion of the position adjustment member. The amount of movement of the piston is regulated by contacting the piston.

Therefore, by rotating the position adjustment member screwed onto the cylinder body and changing the position of the abutment step of the position adjustment member in the insertion hole, the piston rod can be moved freely without the need for a special positioning device. can be stopped.

〔Example〕

An embodiment of the present invention will be described below based on the drawings.

FIG. 1 shows a hydraulic pressure processing machine equipped with a cylinder device according to the present invention, in which numeral 1 denotes a C-shaped frame, on which a cylinder body 2 is attached at an upper position. Reference numeral 3 denotes a constant displacement hydraulic pump installed within the frame 1. 5 is a liquid storage tank, which is attached to the frame 1. A workpiece 6 is fixed to a mounting table IA of the frame 1, and has a button 6A at an upper position for press-fitting. Reference numeral 7 denotes a valve device installed on the liquid storage tank 5, and is configured with an electromagnetically operated switching valve 8 at the top.

FIG. 2 shows a cylinder device of the present invention, in which cover members 11 and 12 are integrally attached to both ends of a cylinder body 10 having a cylinder hole 9 to close the opening of the cylinder hole 9, and a cylinder body 2 is provided. A piston 13 is slidably inserted into the cylinder hole 9. A threaded portion 15 of a piston rod 14 that penetrates through the lid member 11 and projects to the outside of one end surface of the piston 13 is threadedly fixed into a threaded hole 16 formed in the piston 13. Further, a small-diameter insertion hole 17 having a smaller diameter than the screw hole 16 opens on the other end surface of the piston 13 and is connected to the screw hole 16 .

Further, the piston rod 14 is provided with a large diameter insertion hole 18 extending in the axial direction and having a larger diameter than the small diameter insertion hole 17 of the piston 13 . Reference numeral 19 denotes a rod-shaped position adjustment member that penetrates through the lid member 12 and is slidably inserted into the small-diameter insertion hole 17 of the piston 13, and is attached integrally with the lid member 12 through a screw hole 20 formed in the portion 12A. The tip of the position adjustment member 19, into which the threaded part 21 is screwed, moves within the large diameter insertion hole 18 by rotating the position adjustment member 19 into the hexagonal hole 22 provided at the outer end using a tool. is formed by a large diameter portion 23 having a larger diameter than the small diameter insertion hole of the piston 13, and the small diameter insertion hole 17 and the large diameter insertion hole 18
The contact stepped portion 23 of the large diameter portion 23 that comes into contact with the stepped surface 17A
It is a lock nut with A. Thereby, in order to change the position of the position adjustment member 19, the position adjustment member 19 is rotated, and the position is changed by moving it up and down according to the thread pitch of the threaded part 21 with which it is screwed.

Also, a first working chamber 25 is provided in the large diameter insertion hole 18, a second working chamber 26 is provided in the cylinder hole 9 on the outer periphery of the piston rod 14 on one end side of the piston 13, and a position adjustment member is provided on the other end side of the piston 13. A third action chamber 27 is provided on the outer periphery of the third action chamber 19 in a divided manner. The lid member 12 has a first passage 29 connected to the first working chamber 25 through a communication hole 28 provided in the position adjustment member 19 and opened to the large diameter insertion hole 18 side, and a first passage 29 connected to the third working chamber 27. A third flow path 30 is provided in the lid member 11 , and a second flow path 31 is provided in the lid member 11 to connect to the second working chamber 26 . Reference numeral 32 denotes a mounting flange fixed to the lid member 11, and the mounting flange 31 is mounted to the frame 1 with mounting bolts 33, and the piston rod 14 is directed toward the mounting table IA of the frame 1 on which the workpiece 6 is mounted. 34.35
The hydraulic pump 3 and the liquid storage tank 5 are connected to the valve device 7, respectively.

Furthermore, it has a passage 36 connected to the first load passage A of the switching valve 8 and a passage 37 connected to the second load passage B.
A sequence valve 38 with a check valve (hereinafter referred to as a sequence valve) is provided in the passage 37, and a counterbalance valve 39 with a check valve (hereinafter referred to as a counterbalance valve) is provided in the passage 37.

The first flow path 29 is connected to the first load flow path A by connecting to the passage 36.1. The third flow path 30 is connected to the passage 36, thereby being connected to the first load flow path A via a sequence valve 38, and also connected to the liquid storage tank 5 via a check valve 40. Furthermore, the second flow path 31 is connected to the passage 37 and thereby connected to the second load flow path B via the counterbalance valve 39 .

Note that the switching valve 8 is in the neutral position when the first and second load passages A,
B is shut off, the supply flow path P is connected to the discharge flow path R, and when switched to the right position, the supply flow path P, the first load flow path A, and the discharge flow path R are connected.
and the second load flow path B, and when switched to the left position, the supply flow path P and the second load flow path B, and the discharge flow path R and the first load flow path A are connected. Further, the sequence valve 38
A controlled flow is made to flow from the load passage A to the first passage 29 when the pressure in the first load passage A reaches a set pressure, and a free flow is made in the opposite direction, and the check valve 40 is It is installed so that the flow to the liquid storage tank 5 is blocked and the flow from the liquid storage tank 5 is allowed to flow freely.

The counterbalance valve 39 is provided to provide a free flow from the second load flow path B to the second flow path 31 and a controlled flow in the opposite direction to suppress the downward movement of the piston 14 due to its own weight. .

Next, the operation of this configuration will be explained.

In FIG. 2, when the piston 14 is switched from the neutral position at the rising end to the right position of the switching valve 8, the supply flow path P is connected to the first load flow path A, and the discharge flow path R is connected to the second load flow path B. is,
Before starting machining, the entire amount of liquid discharged from the hydraulic pump 3 flows through the communication hole 28 of the position adjustment member 19 into the first working chamber 25.
The liquid in the second working chamber 26 opens the counterbalance 39, is returned to the liquid storage tank 5, and moves down the piston 13 at high speed. At this time, the third working chamber 2 whose volume increases
The liquid in the liquid storage tank 5 is sucked into the liquid storage tank 7 through the check valve 40. When the pin 6A on the workpiece 6 comes into contact with the pin 6A, the discharge hydraulic pressure increases and the third
The discharged liquid is supplied to the action chamber 27 to generate a large pressing force to cause slow feeding, and as shown in FIG.
The contact position is regulated and the pin 6A on the workpiece 6 is press-fitted to an arbitrary position.

After that, when the switching valve 8 is switched to the left position, the second working chamber 2
The discharge liquid is supplied to the sequence valve 3 through the check valve of the counterbalance valve 39, and the liquid in the third action chamber 27 is supplied to the sequence valve 3.
8 to the storage tank 5 along with the liquid in the first working chamber 25, and the piston 13 is quickly returned. When the piston 13 reaches its rising end, the switching valve 8 is brought to the neutral position.

With this operation, the step surface 17 between the small diameter insertion hole 17 and the large diameter insertion hole 18 is brought into contact with the contact stepped portion 23A of the large diameter portion 23 of the position adjustment member 19.
The amount of movement of the piston 13 is regulated by contacting A. Therefore, when installing the cylinder body 2, rotate the position adjustment member 19 screwed into the part 12A, and then
By changing 3A, the piston rod 14 can be stopped at any position without providing a separate positioning device that increases the size of the entire device. In addition, in order to change the stopping position of the piston rod 14, the position adjustment member 1
9 is rotated to directly change the amount of movement of the piston 13, and the stop position can be determined more accurately than with a separate positioning device that indirectly changes the amount of movement of the piston 13.

〔Effect of the invention〕

As a result, according to the present invention, a piston is provided that is slidably inserted into a cylinder hole formed in a cylinder body, a piston rod is provided to protrude from one end surface of the piston, and a piston rod is provided that extends toward the piston rod side from the other end surface of the piston. A through hole is opened and a position adjusting member is slidably inserted into the through hole and screwed onto the cylinder body to form working chambers on both ends of the piston and within the through hole to adjust the position. The member is provided with a communication hole that leads the liquid to the action chamber within the insertion hole, and the insertion hole is provided with a contact step that comes into contact with the stepped surface formed in the hole, which allows for position adjustment when screwed into the cylinder body. By rotating the member and changing the abutting stepped portion at its tip, the piston rod can be stopped at any position without the need for a separate positioning device that increases the size of the entire device.

In addition, to change the stop position of the piston rod, the position adjustment member is rotated to directly change the amount of piston movement, compared to a separate positioning device that changes the position indirectly. This has the advantage of being able to accurately determine the stopping position.

[Brief explanation of the drawing]

1 to 3 show an embodiment of the present invention, FIG. 1 is a side view of a hydraulic pressure processing machine equipped with a cylinder device of the present invention, and FIG. - Longitudinal cross-sectional view of the cylinder device, ' I - Figure 3 is a partial vertical cross-sectional view showing the operating state of the cylinder device. 2-m-cylinder body, 9-m-cylinder hole, 13-111 piston, 14-m-piston rod, 17.18
-11 push-through hole, 17A-m-step surface, 19-11 position adjustment member, 23A--1 contact step, 25.26.27--
- Working chamber, 28-m series of holes.

Claims (1)

[Claims] A piston is provided that is slidably inserted into a cylinder hole formed in a cylinder body, a piston rod is provided protruding from one end surface of the piston, and an insertion hole extending toward the piston rod is opened and provided on the other end surface of the piston, A position adjustment member slidably inserted into the insertion hole is screwed onto the cylinder body to define an action chamber on both ends of the piston and inside the insertion hole, and the position adjustment member has an action chamber inside the insertion hole. A cylinder device comprising a communication hole through which liquid is led out, and a contact stepped portion that comes into contact with a stepped surface formed in the insertion hole.