JPH0717843Y2 - Fluid pressure cylinder with fluid supply mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a fluid pressure cylinder having a fluid supply mechanism.

[Prior Art] A known fluid pressure cylinder can drive a work machine, but cannot directly supply a pressure fluid to the work machine. For this reason, the pressurized fluid is supplied to the work machine by a tube or the like, but the tube may interfere with the operation of the work machine to lower workability or cause an unexpected accident.

In order to solve this problem, a piston cylinder penetrating the cylinder is proposed with a fluid pressure cylinder provided with an axial pressure fluid supply passage, but in order to connect a tube to the reciprocating piston rod, It is insufficient in terms of workability improvement and accident prevention.

[Problem to be Solved by the Invention] An object of the present invention is to provide a fluid pressure cylinder having a fluid supply mechanism.

[Means for Solving the Problems] In order to solve the above problems, a fluid pressure cylinder having a fluid supply mechanism of the present invention slides in a cylinder in which a cylinder hole and a fluid flow path are arranged in parallel with each other. A piston, a piston rod having an axial supply flow path, a slit that connects the cylinder hole and a fluid flow path, a flexible strip that closes the slit from the cylinder hole side, and a strip that passes through the slit. A slide block that moves integrally with the piston along the outside of the body, a passage that connects the fluid flow path and the supply flow path that are opened in the slide block and the piston, and communicates with a cylinder hole defined by the piston. It is characterized by including a pair of first ports and a second port communicating with the fluid flow path.

[Operation] When the pressure fluid is supplied to and discharged from the first port to the cylinder hole and the pressure fluid is supplied to the fluid passage from the second port,
The piston and the slide block that moves integrally with the piston reciprocate, and the pressure fluid in the fluid passage is supplied to the supply passage of the piston rod through the passage. Therefore, the working fluid can be supplied to the working equipment by the piston rod.

In this case, since the fluid flow path and the supply flow path are always in communication with each other by the slide block, the pressure fluid can be supplied to the piston rod while reciprocating the piston,
It can also be supplied at the end of the piston stroke.

[Embodiment] FIGS. 1 to 4 show an embodiment of the present invention. This fluid pressure cylinder comprises a cylinder body 2, a cylinder 1 having a head cover 3a for closing both ends thereof, and a rod cover 3b.
Cylinder hole 4 formed parallel to the axial direction of cylinder body 2
And fluid passages 5a, 5b, a piston 6 and a piston rod 7 that slide in the cylinder hole 4, and slide blocks 8a, 8b that slide along the fluid passages 5a, 5b.

The cylinder hole 4 and the fluid flow paths 5a, 5b are communicated with each other by radial slits 11a, 11b, and these slits are airtight by a flexible strip 12, which is wider than the slits. Sealed, and both ends of these strips are fixed to the covers 3a and 3b.

The slide blocks 8a and 8b are port guides 14a and 14b that slide between the strips 12 and so on through the slits 11a and 11b.
And the guide covers 15a, 1 that slide along the fluid flow paths 5a, 5b.
5b with port guides 14a, 14b on the piston 6
The guide covers 15a, 15b are hermetically sealed between the slits 11a, 11b and the strips 12, ...

The slide blocks 8a, 8b and the passages 17a, 17b opened in the piston 6 have one end open to the fluid passages 5a, 5b and the other end of the supply passages 18a, 18b formed in the axial direction of the piston rod 7. The other ends of the supply flow paths 18a and 18b communicate with one end and are open to the outside at the end of the piston rod 7.

The head cover 3a includes first ports 21a and 21b for supplying pressure fluid to the pressure chambers 20a and 20b defined by the piston 6,
Second ports 22a, 22b for supplying pressure fluid to the fluid flow paths 5a, 5b
Are opened, and the first port 21a and the pressure chamber 20b are communicated with each other by the communication passage 23 opened in the cylinder body 2 and the rod cover 3b.

Therefore, since the pressure fluid can be supplied from the head cover 3a to the fluid flow paths 5a, 5b and the pressure chambers 20a, 20b, the piping can be easily connected. Further, as shown by the dotted line in FIG. 3, some or all of these ports may be opened on the side surface of the head cover 3a.

In the above embodiment, the pressure fluid such as compressed air is supplied to and discharged from the first ports 21a and 21b to the pressure chambers 20a and 20b, and the second ports are provided.
When pressure fluid is supplied from 22a, 22b to the fluid flow paths 5a, 5b, the piston 6 and the slide block 8 that slides integrally with the piston 6
a and 8b reciprocate in the cylinder body 2, and at the same time, the fluid flow path 5
The pressure fluid of a, 5b is passed through the passages 17a, 1 of the slide blocks 8a, 8b.
It is supplied from 7b to the supply channels 18a and 18b of the piston rod 7.

Therefore, the pressure fluid can be directly supplied to the fluid device (not shown) attached to the piston rod 7,
Since it is not necessary to use a tube for supplying fluid, it is possible to completely prevent work troubles and accidents caused by the tube.

In this case, the fluid passages 5a, 5b and the supply passages 18a, 18b are the passages 17a,
Since they are always in communication with each other by 17b, the pressure fluid can be supplied to the supply passages 18a, 18b even if the piston 6 slides. Further, the slits 11a, 11b are sealed by the strip-shaped body 12, ..., Particularly, the strip-shaped body pressed against the slits 11a, 11b by the fluid pressure of the fluid flow paths 5a, 5b.
No pressurized fluid leaks from 11b.

[Advantages of the Invention] The fluid pressure cylinder having the fluid supply mechanism of the present invention can supply the pressure fluid to the piston rod from the fluid flow path provided in the cylinder, and therefore uses a tube for supplying the pressure fluid to the fluid device. Since it is not necessary, the tube does not interfere with the work, the work efficiency can be improved, and the accident due to the tube can be prevented.

Further, since the cylinder hole and the fluid flow path are provided side by side, it is not necessary to increase the stroke length of the piston, so that the installation space for the fluid pressure cylinder can be reduced.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, and FIG. 1 is an AA of FIG.
A sectional view, FIG. 2 is an enlarged vertical sectional view of a main part of FIG. 1, FIG. 3 is a right side view, and FIG. 4 is a left side view. 1 ... Cylinder, 4 ... Cylinder hole, 5a, 5b ... Fluid flow path, 6 ... Piston, 7 ... Piston rod, 8a, 8b ...
… Slide block, 11a, 11b …… Slit, 12 …… Band, 17a, 17b …… Passage, 18a, 18b …… Supply flow path, 21a, 21
b ... 1st port, 22a, 22b ... 2nd port.

Claims (1)

[Scope of utility model registration request] 1. A cylinder in which a cylinder hole and a fluid flow path are arranged in parallel, a piston sliding in the cylinder hole, a piston rod having an axial supply flow path, and the cylinder hole and the fluid flow path communicating with each other. Slits, a flexible strip that closes the slit from the cylinder hole side, a slide block that moves integrally with the piston along the outside of the strip passing through the slits, and the slide block and the piston are provided. A passage that connects the fluid passage and the supply passage, a pair of first ports that communicate with the cylinder hole defined by the piston, and a second port that communicates with the fluid passage. A fluid pressure cylinder having a characteristic fluid supply mechanism.