JPH0132365B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fluid cylinder device capable of fixedly holding an operating shaft that is moved forward and backward by pressure fluid.

Conventionally, in this type of fluid cylinder device, a cylinder body from which an operating shaft protrudes from one end of the piston is integrally provided with a fixing and holding means for the operating shaft, and the fixing and holding means is attached to the outer circumferential surface of the protruding operating shaft. A plurality of friction members are pressed into contact with the drive shaft, and the operating shaft is tightened and held fixed by the friction members. However, the outer circumferential surface of the actuating shaft is easily damaged by pressure contact with the friction member, and the actuating shaft must be provided with an unsuitable strength regardless of the load or application. Even when fixedly held near the end, it is necessary to improve the strength of the entire operating shaft, which has disadvantages such as troublesome manufacturing.

The present invention eliminates these drawbacks and provides a fluid cylinder device capable of reliably fixing and holding an operating shaft without changing the strength of the operating shaft.

Therefore, in the present invention, a piston is slidably fitted into a cylinder body to form a divided working chamber, and an operating shaft is provided to protrude from one end of the piston to the outside of the cylinder body, and is actuated by pressurized fluid. a fluid cylinder to be operated; a rod protruding from the end of the piston facing the operating axis of the fluid cylinder so as to prevent fluid leakage from the cylinder body near the sliding end of the piston in one direction and protrude tightly; A tube connected to the cylinder body, which is formed so that it fits externally onto the rod protruding from the cylinder body and tightly fits the rod by its own elastic force, and expands in the radial direction by pressure fluid acting on the inner surface to loosen the tightness of the rod. A cylindrical member having a shape, and a fluid control means for introducing pressure fluid into the cylindrical member and discharging the fluid within the cylindrical member, the fluid control means sliding the piston near the sliding end in one direction. When the rod protrudes tightly from the cylinder body, the pressure of the fluid within the cylindrical member is increased, causing the cylindrical member to expand in the radial direction, and the rod is fitted into the cylindrical member so that the fluid within the cylindrical member can be sealed.

In this configuration of the present invention, when the rod protruding from the end of the piston facing the operating shaft tightly protrudes from the cylinder body, the fluid inside the cylindrical member is sealed by the fluid control means, so the pressure is increased and the rod is pressed against the cylindrical member. The rod expands in the radial direction and fits into the cylindrical member, and by operating the fluid control means to discharge the fluid in the cylindrical member, the cylindrical member contracts due to its own elastic force and tightly fits the rod. As a result, the operating shaft is held fixed. Therefore, since the actuating shaft is not pressed against the actuating shaft as in the conventional case, the actuating shaft can be reliably fixed and held without changing the strength of the actuating shaft.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

In FIG. 1, reference numeral 1 denotes a fluid cylinder, and lid members 3 and 4 are integrally installed at both ends of a cylinder tube 2 to seal and close the opening, thereby forming a cylinder body. The piston 5 is slidably fitted into the interior of the piston 5 to define working chambers 6 and 7.
An operating shaft 8 is provided to protrude from one end of the lid member 3. 9 is a rod protruding from the end of the piston 5 facing the operating shaft 8 of the fluid cylinder 1 to securely hold the operating shaft. It is provided so as to protrude from the lid member 4 of the cylinder body. 1
0 is a cylindrical member with a protruding rod 9 that can be tightly fitted into it, and holding members 11 and 12 are provided at both ends.
The cylindrical member 10 is integrally connected to the cover member 4 of the cylinder body by a plurality of tie rods 13, and the cylindrical member 10 is moved in the radial direction by introducing pressure fluid into the gap 14 formed by the external fitting with the rod 9. It is provided so that it expands and loosens the tightness of the rod 9. Further, the holding member 12 is provided with a flow path 15 for introducing pressure fluid into the gap 14. 16,1
Numerals 7, 18, 19, 20, and 21 are sealing members for preventing fluid leakage, and 22 is a four-port, three-position directional control valve for operating the fluid cylinder 1, which is connected to each working chamber via pipes 23 and 24. 6 and 7 on the pressure source side 2
5 and low pressure side 26. Reference numeral 27 denotes a three-port, three-position directional switching valve as a fluid control means for expanding and contracting the cylindrical member 10, which connects the flow path 15 of the holding member 12 to a pressure source side 25 and a low pressure side 26 via a pipe line 28. Switching control is performed, and in the neutral position, pipe line 2
I am trying to block out 8. A safety valve 29 is provided in the conduit 28 and regulates the maximum pressure of the pressure fluid acting on the cylindrical member 10.

Next, the operation of this configuration will be explained.

In FIG. 1, the piston 5 of the fluid cylinder 1 is located at the right sliding end, the cylindrical member 10 tightly fits the rod 9, and the operating shaft 8 of the fluid cylinder 1 is caused by the contact friction between the rod 9 and the cylindrical member 10. It is held fixed by force. In order to operate the actuating shaft 8 from this state, the directional control valve 27 is set to the right switching position and pressure fluid is introduced into the gap 14 through the conduit 28 and the flow path 15, and the cylindrical member 10 is pressed against the inner circumferential surface. The rod 9 is expanded in the radial direction by the acting force of the working pressure fluid, and the rod 9 is loosened, and the directional control valve 22 is set to the left switching position, introducing pressure fluid into the working chamber 7 of the fluid cylinder 1, and simultaneously controlling the fluid in the working chamber 6. By discharging the
The rod 9 is removed from the cylindrical member 10 by sliding the piston 5 to the left. After returning the directional switching valve 27 to the neutral switching position and blocking the pipeline 28, the operating shaft 8 is smoothly moved forward and backward by repeatedly operating the directional switching valve 22.

Furthermore, in order to hold the operating shaft 8 fixed, the directional control valve 22 is set to the right switching position and the piston 5 is slid near the right sliding end, so that the rod 9 is sealed near the right sliding end of the piston 5. The cylindrical member 10 is joined to the member 20 to seal the inside of the cylindrical member 10, and as shown in FIG. The rod 9 is smoothly inserted into the cylindrical member 10. When the rod 9 is inserted, the directional switching valve 27 is set to the right switching position and the cylindrical member 10
When the pressurized fluid inside is discharged to the low pressure side 26, the cylindrical member 10 contracts by its own elastic force and tightly fits the rod 9, and the operating shaft 8 is fixedly held near the operating end. Then, in order to move the operating shaft 8 back and forth again, the directional control valves 22 and 27 are operated as described above.

With this operation, the piston 5 facing the operating shaft 8
When the rod 9 protruding from the end tightly protrudes from the lid member 4 constituting the cylinder body, the fluid inside the cylindrical member 10 is pressurized because the directional control valve 27 blocks the pipe line 28 and seals it. The rod 9 is inserted into the cylindrical member 10 by expanding the cylindrical member 10 in the radial direction, and the directional control valve 27 is operated to open the pipe line 2.
8 to the low pressure side 26 to discharge the fluid in the cylindrical member 10, the cylindrical member 10 contracts due to its own elastic force and tightly fits the rod 9, so that the actuating shaft 8 is held fixed. Therefore, since the actuating shaft 8 is not pressed against the conventional
The actuating shaft 8 can be reliably fixed and held without changing the strength of the actuating shaft 8. In addition, by discharging the fluid inside the cylindrical member 10, the cylindrical member 10 contracts due to its own elastic force and tightly fits the rod 9, thereby holding the actuating shaft 8 fixed. This can be continued without using special means, and the configuration can be simplified. moreover,
By sliding the piston 5 near the sliding end in one direction, the rod 9 closely protrudes from the lid member 4 constituting the cylinder body and acts to increase the pressure of the fluid in the cylindrical member 10. The pressure-increasing fluid inside can provide a buffering effect for the piston 5, and the operating shaft 8 can be gently stopped and held fixed. Furthermore, the rod 9 has a relatively short shaft length that securely holds the operating end of the operating shaft 8, and is easy to manufacture, so that a compact fluid cylinder device suitable for the use of the fluid cylinder 1 can be obtained.

In this way, the present invention has a piston slidably fitted into a cylinder body to form a divided working chamber, and an actuating shaft protruding from one end of the piston extending outside the cylinder body so that the piston is slidably fitted into the cylinder body. A fluid cylinder to be operated; and a rod protruding from the end of the piston facing the operating axis of the fluid cylinder so as to prevent fluid from leaking from the cylinder body near the sliding end of the piston in one direction. The rod is connected to the cylinder body and is fitted onto the outside of the rod protruding from the cylinder body so that the rod is tightly fitted by its own elastic force, and expands in the radial direction by pressure fluid acting on the inner surface to loosen the tightness of the rod. Fluid control means for introducing pressure fluid into the cylindrical member and discharging fluid within the cylindrical member,
The fluid control means slides the piston near the sliding end in one direction so that the rod protrudes tightly from the cylinder body, thereby increasing the pressure of the fluid in the cylindrical member, expanding the cylindrical member in the radial direction, and causing the rod to fit. Since the fluid in the cylindrical member is inserted so as to be sealed, the actuating shaft is not pressed against the actuating shaft as in the conventional case, so the actuating shaft can be reliably fixed and held without changing the strength of the actuating shaft.

In addition, by discharging the fluid inside the cylindrical member, the cylindrical member contracts due to its own elastic force and tightly fits the rod, thereby fixing and holding the actuating shaft. This can be done without using special means, and the configuration can be simplified. Furthermore, by sliding the piston near the sliding end in one direction, the rod protrudes tightly from the cylinder body and acts to increase the pressure of the fluid in the cylindrical member, so the pressure increasing fluid in the cylindrical member causes the piston to A buffering effect can be obtained, and the operating shaft can be gently stopped and held fixed. Furthermore, it is easy to manufacture and has the effect of providing an optimal small-sized fluid cylinder device depending on the application.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a fluid cylinder device showing one embodiment of the present invention, and FIG. 2 is a diagram showing an operating state. 1...Fluid cylinder, 5...Piston, 8...
Operating shaft, 9... Rod, 10... Cylindrical member, 14
……gap.

Claims (1)

[Claims] 1 A fluid cylinder in which a piston is slidably fitted into a cylinder body to form a divided working chamber, and an operating shaft is provided at one end of the piston and projects outside the cylinder body, and is actuated by pressurized fluid. , a rod protruding from the end of the piston facing the operating axis of the fluid cylinder so as to prevent fluid leakage from the cylinder body near the sliding end of the piston in one direction, and a rod protruding from the cylinder body; A cylindrical member connected to the cylinder body, which is fitted onto the outside of the rod and tightly fits the rod by its own elastic force, and expands in the radial direction by pressure fluid acting on the inner surface to loosen the tightening of the rod. , a fluid control means for introducing pressure fluid into the cylindrical member and discharging the fluid within the cylindrical member, and the fluid control means slides the piston near the sliding end in one direction so that the rod moves toward the cylinder body. A fluid cylinder device configured to be able to seal the fluid in a cylindrical member by tightly protruding from the cylindrical member so that the pressure of the fluid in the cylindrical member is increased and the cylindrical member expands in the radial direction so that a rod can be inserted into the cylindrical member.