WO2013157837A1

WO2013157837A1 - Hydrostatic piston bearing of single rod cylinder

Info

Publication number: WO2013157837A1
Application number: PCT/KR2013/003228
Authority: WO
Inventors: 서호덕
Original assignee: Seo Ho-Deuk
Priority date: 2012-04-18
Filing date: 2013-04-17
Publication date: 2013-10-24
Also published as: KR101176924B1

Abstract

Disclosed is a hydrostatic piston bearing of a single rod cylinder which comprises: a housing including a chamber and a rod guide; a piston housed in the housing and partitioning the chamber into a front chamber and a rear chamber by means of a head formed on the rear end of the rod; an inlet tube passing through one side of the housing in order for the outside of the housing to be in communication with the rear chamber; and an outlet tube passing through the other side of the housing in order for the outside of the housing to be in communication with the front chamber. The hydrostatic piston bearing of a single rod cylinder comprises: a plurality of first pockets formed on the outer periphery in the circumferential direction of the head; a plurality of second pockets formed on the inner periphery in the circumferential direction of the rod guide; a first supply tube defining a conduit line in the head and in communication with the rear chamber with the first pockets; and a second supply tube defining a conduit line in the housing and in communication with the inlet tube with the second pockets, wherein a hydrostatic bearing is formed in the first pockets and the second pockets by means of a fluid supplied through the first supply tube and the second supply tube, and there is no need to install a separate fluid supply and discharge line at the outside of the cylinder to form a hydrostatic bearing.

Description

Piston Hydrostatic Bearings for Single Rod Cylinders

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piston static pressure bearing of a single rod cylinder, and more particularly to a piston static pressure bearing of a single rod cylinder, which does not need to install a separate fluid supply and discharge line for forming the static pressure bearing outside of the cylinder.

A cylinder of a general machine tool is composed of a housing and a piston accommodated in the housing, and has a structure in which the piston moves forward and backward linearly by the pressure of the fluid supplied and discharged into and out of the housing.

As such, the cylinder forms a hydrostatic bearing on the friction surface of the piston and the housing to prevent mechanical friction between the housing and the piston.

Such a static pressure bearing acts as a bearing by supplying a fluid between the moving bodies generating relative friction by sliding relative movement with each other to maintain a fine gap between the moving bodies by hydraulic pressure and providing an oil film to the fine gap.

As shown in FIGS. 1-a and 2-a, the head static pressure is spaced apart at regular intervals along the circumferential direction from the friction surface of the housing 10 of the cylinder and the head 21 and the rod 22 of the piston 20. A bearing 31 and a rod hydrostatic bearing 32 are formed.

In addition, a rod hydrostatic bearing 32 is formed between the rod 22 and the housing 10 so that the rod 22 is always floating in the oil, and the head 21 is also in the oil. It will float.

On the other hand, when the piston 20 acts on the unloading load (F) to the piston as shown in Figure 1-b, the gap between the lower rod static pressure bearing 32 and the rod 22 is narrowed, Leakage of the fluid forming the lower portion of the rod static pressure bearing 32 is reduced, so that the pressure of the lower portion of the rod static pressure bearing 32 is increased, as shown in FIG. 1 reaction force R1 is formed.

Similar to the process in which the first reaction force R1 is formed, a second reaction force R2 is formed on the head static pressure bearing 31, so that the piston 20 is formed inside the housing 10 as shown in FIG. 1-c. It is to be centered to prevent the eccentric driving of the piston (20).

The gist of the prior art for forming such a static pressure bearing will be described with reference to FIG. 3 as follows.

As shown in FIG. 3, the cylinder is operated by the first supply discharge pipe line 40, and the head and rod static pressure bearing 31 is driven by the second supply discharge pipe line 50 and the third supply discharge pipe line 60. 32) is formed.

* As described above, the related art has to install a hydraulic hose outside the housing 10 to supply and discharge fluid to the second supply discharge pipe line 50 and the third supply discharge pipe line 60, and the hydraulic hose In the straight forward and backward reciprocating motion of the piston 20, there is an inconvenience to be installed in conjunction with the piston 20.

In addition, when the cylinder is operated at a high speed, the hydraulic hose expands to play a role as a spring, which makes it difficult to precisely control the cylinder.

The present invention has been made to solve the above problems, the fluid inlet line of the cylinder and the pipeline for supplying fluid to the pocket in which the positive pressure bearing is formed to communicate with each other, a separate fluid supply line for forming a positive pressure bearing It is an object to provide a piston static pressure bearing of a single rod cylinder that does not need to be formed outside the cylinder.

In addition, the discharge pipe of the fluid leaking from the pocket and the fluid discharge pipe of the cylinder to communicate with each other, it is not necessary to form a separate fluid discharge line for the discharge of the fluid leaking from the pocket of the single rod cylinder Another object is to provide a piston hydrostatic bearing.

The piston static pressure bearing of the single rod cylinder of the present invention for achieving the above object is the front chamber and the rear side of the chamber by a housing including a chamber and a rod guide, and a head received in the housing and formed at the rear end of the rod. A piston partitioning into a chamber, an inlet pipe passing through one side of the housing to communicate the outside of the housing with the rear chamber, and a discharge pipe passing through the other side of the housing to communicate the outside of the housing with the front chamber; A single rod cylinder comprising: a first pocket formed in plural on an outer circumferential surface in a circumferential direction of the head, and a second pocket formed in plural on an inner circumferential surface in a circumferential direction of the rod guide; A first supply pipe communicating with the rear chamber and the first pocket to form a pipe, and a pipe inside the housing to form a pipe. And a second feed pipe communicating the inlet pipe and the second pocket, characterized in that by fluid supplied through the first supply line and the second supply pipe are hydrostatic bearing formed in the first pocket to the second pocket.

In addition, an orifice is provided at the inlet of the first pocket and the second pocket.

In addition, the first labyrinth seal portion is formed on the front and rear sides of the first pocket, characterized in that the first discharge pipe for communicating the first labyrinth seal portion and the front chamber.

As described above, a second labyrinth seal part is formed at the front and rear sides of the second pocket, and a second discharge pipe communicating with the second labyrinth seal part and the front chamber is provided.

On the other hand, a housing including a chamber and a rod guide, a piston which is partitioned into the front chamber and the rear chamber by a head accommodated in the housing formed on the rear end of the rod, and through the one side of the housing through the housing A one-rod cylinder including an inflow pipe for communicating the outside of the housing and the rear chamber, and a discharge pipe for communicating the outside of the housing and the front chamber through the other side of the housing, the outer circumferential surface of the head along the circumferential direction A plurality of first pockets formed in the plurality of first pockets, a plurality of second pockets formed in an inner circumferential surface along the circumferential direction of the rod guide, a through tube communicating with the front and rear chambers through one side of the head, and the through tube A first supply pipe communicating the first pocket with the first pocket, and installed in a pipe line of the through pipe in a pipe line where the through pipe and the first supply pipe intersect. The first supply pipe includes a shuttle valve, a second supply pipe forming a conduit inside the housing to communicate the inflow pipe and the second pocket, and a third supply pipe communicating the discharge pipe and the second pocket. A hydrostatic bearing is formed in the first pocket and the second pocket by the fluid supplied through the second supply pipe and the third supply pipe.

In addition, the first supply check valve and the second supply check valve is characterized in that installed on the pipeline of the second supply pipe and the third supply pipe.

As described above, a first labyrinth seal part is formed on the front and rear sides of the first pocket, and a first discharge pipe communicating with the first labyrinth seal part and the front and rear chambers is provided, and a first discharge pipe is disposed on a pipe line of the first discharge pipe. Characterized in that the discharge check valve is installed.

In addition, a second labyrinth seal part is formed at the front and rear sides of the second pocket, and a second discharge pipe communicating with the second labyrinth seal part and the second supply pipe is provided, and a second discharge pipe is disposed on the pipeline of the second discharge pipe. It is characterized in that the check valve is installed.

In addition, a third discharge pipe for communicating the second labyrinth seal portion and the discharge pipe is provided, characterized in that the third discharge check valve is installed on the pipeline of the third discharge pipe.

On the other hand, a housing including a chamber and a rod guide, a piston which is partitioned into the front chamber and the rear chamber by a head accommodated in the housing formed on the rear end of the rod, and through the one side of the housing through the housing A one-rod cylinder including an inflow pipe for communicating the outside of the housing and the rear chamber, and a discharge pipe for communicating the outside of the housing and the front chamber through the other side of the housing, the outer circumferential surface of the head along the circumferential direction A plurality of first pockets formed in the plurality of first pockets, a plurality of second pockets formed in an inner circumferential surface along the circumferential direction of the rod guide, a through tube communicating with the front and rear chambers through one side of the head, and the through tube A first supply pipe communicating the first pocket with the first pocket, and installed in a pipe line of the through pipe in a pipe line where the through pipe and the first supply pipe intersect. The first pocket by the fluid supplied through the first supply pipe and the second supply pipe, including a shuttle valve and a second supply pipe forming a conduit inside the housing to communicate the second pocket and the outside of the housing; And a positive pressure bearing is formed in the second pocket.

In addition, a first labyrinth seal portion is formed on the front and rear sides of the first pocket, a first discharge pipe communicating with the first labyrinth seal portion and the front and rear chambers is provided, and a first discharge pipe is disposed on the pipeline of the first discharge pipe. It is characterized in that the check valve is installed.

As described above, a second labyrinth seal part is formed on the front and rear sides of the second pocket, and a second discharge pipe is provided to communicate the outside of the housing with the second labyrinth seal part.

As described above, according to the present invention, the following effects can be expected.

The hydrostatic bearing can be formed by a single fluid source, and in addition to having a single discharge path, there is an advantage that the fluid supply and discharge structure outside the cylinder can be simplified.

In addition, there is no hydraulic hose that is interlocked with the piston during the high speed operation of the cylinder there is an advantage that can facilitate the precise control of the cylinder.

1 is a view showing a state of a cylinder in which a static pressure bearing is formed at a normal load and a single load.

FIG. 2 is a diagram illustrating a cross section of Z-Z of FIG. 1.

3 is a view showing the gist of the prior art.

4 is a view showing a first preferred embodiment of a piston hydrostatic bearing of a single rod cylinder according to the present invention.

5 is a cross-sectional view of A-A and B-B shown in FIG. 4.

6 is a cross-sectional view of C-C and D-D shown in FIG. 4.

FIG. 7 is an enlarged view of E shown in FIG. 4.

8 is a view showing a second preferred embodiment of a piston hydrostatic bearing of a single rod cylinder according to the present invention.

9 is a cross-sectional view of A-A and B-B shown in FIG. 8.

FIG. 10 is a cross-sectional view of C-C and D-D shown in FIG. 8.

11 is a view showing a third preferred embodiment of the piston hydrostatic bearing of the single rod cylinder according to the present invention.

Hereinafter, a first embodiment, a second embodiment, and a third embodiment of a piston static pressure bearing of a single rod cylinder according to the present invention will be described in detail with reference to the accompanying drawings.

Figure 4 is a side view showing the configuration of a first preferred embodiment of a piston hydrostatic bearing of a single rod cylinder according to the present invention, Figure 5 is a cross-sectional view of AA and BB shown in Figure 4, Figure 6 is a CC shown in Figure 4 And DD are cross-sectional views, and FIG. 7 is an enlarged view of E shown in FIG.

First, the configuration of the first embodiment of the piston static pressure bearing of the single rod cylinder according to the present invention will be described with reference to the drawings.

The chamber 110 is formed by a housing 100 including a chamber 110 and a rod guide 130, and a head 210 accommodated in the housing 100 and formed at an end of the rod 230. Piston 200 partitioned into a 111 and the rear chamber 111 ', and an inlet pipe for communicating the outside of the housing 100 and the rear chamber 111' through one side of the housing 100 ( 310 and a discharge pipe 330 penetrating the other side of the housing 100 to communicate the outside of the housing 100 with the front chamber 111, and is supplied through the inlet pipe 310. When the fluid is filled in the rear chamber 111 ', the piston 200 is advanced, and when the pressure of the fluid filled in the rear chamber 111' is lowered, an external force acting on the rod 230 or Single rod seal for the piston 200 is moved backwards and forwards back and forth by the elastic body accommodated in the front chamber More specifically, in the single-acting single rod cylinder, the first pocket 510 and the second pocket 530, the first supply pipe 410 and the first pocket in order to provide a piston hydrostatic bearing of the single rod cylinder according to the present invention. It is configured to include two supply pipes (430).

The first pocket 510 is formed in a plurality of recesses on the outer peripheral surface in the circumferential direction of the head 210, the second pocket 530 is recessed in a plurality on the inner peripheral surface along the circumferential direction of the rod guide 130 By being formed, it is possible to receive a fluid for providing a hydrostatic bearing.

Meanwhile, the first supply pipe 410 forms a conduit inside the head 210 to communicate the rear chamber 111 'and the first pocket 510 to fill the rear chamber 111'. To be supplied to the first pocket 510.

In addition, the second supply pipe 430 forms a conduit in the housing 100 to communicate the inflow pipe 310 and the second pocket 530 to supply the fluid supplied through the inflow pipe 310. To be supplied to the second pocket 530.

This is because the inlet pipe 310 and the pipes for supplying the fluid to the first pocket 510 and the second pocket 530, which is a feature of the present invention communicate with each other, a separate fluid outside the housing 100 There is no need to install a supply line.

In addition, an orifice 800 is installed at the inlet through which the fluid of the first pocket 510 and the second pocket 530 is supplied to the first pocket 510 and the second supply pipe 430. The pressure and flow rate of the fluid supplied to the first pocket 510 and the second pocket 530 can be adjusted.

The fluid supply structure for forming the static pressure bearing of the first preferred embodiment of the piston static pressure bearing of the single rod cylinder according to the present invention has been described above, and the discharge structure of the fluid will be described next.

The discharge structure of the fluid of the first preferred embodiment of the piston static pressure bearing of the single rod cylinder according to the present invention includes a first labyrinth seal 610 and a second labyrinth seal 630, a first discharge pipe 710 and It consists of a second discharge pipe (730).

First, a first labyrinth seal part 610 is formed on the front and rear sides of the first pocket 510, and as shown in FIG. 7, the first labyrinth seal part 610 is an oil groove 611. And a plurality of gaps 613.

The oil groove 611 recovers the fluid leaking from the first pocket 510, and the gap 613 increases the lubrication effect by using the leaking fluid.

As such, the first discharge pipe 710 is provided to communicate the first labyrinth seal part 610 and the front chamber 111, and the fluid leaking from the first pocket 510 is the first labyrinth seal part ( It recovers from the 610 to be discharged to the front chamber 111.

In addition, a second labyrinth seal part 630 is formed on the front and rear sides of the second pocket 530, and a second discharge pipe 730 is provided to communicate the second labyrinth seal part 630 and the front chamber 111. The liquid leaking from the second pocket 530 is recovered from the second labyrinth seal 630 and discharged to the front chamber 111.

Here, when the fluid discharged by the first discharge pipe 710 and the second discharge pipe 730 is filled in the front chamber 111, when the piston 200 is advanced, the housing through the discharge pipe 330 100 is discharged to the outside.

This is because the first labyrinth seal portion 610 and the second labyrinth seal portion 630 and the discharge pipe 330 is in communication with each other, a separate fluid discharge line outside the housing 100 There is no need to install it.

Hereinafter, a second preferred embodiment of a piston hydrostatic bearing of a single rod cylinder according to the present invention will be described in detail with reference to FIGS. 8 to 10.

FIG. 8 is a side view showing the construction of a second preferred embodiment of a piston hydrostatic bearing of a single rod cylinder according to the present invention, FIG. 9 is a sectional view of AA and BB shown in FIG. 8, and FIG. 10 is a CC shown in FIG. 8. And DD cross section.

First, a configuration of a second embodiment of a piston static pressure bearing of a single rod cylinder according to the present invention will be described with reference to the drawings.

Here, the description overlapping with the first preferred embodiment of the piston hydrostatic bearing of the single-rod cylinder according to the present invention described above will be omitted.

As shown in FIG. 8, the piston 200 moves forward and backward by supplying and discharging fluid to the front chamber 111 and the rear chamber 111 ′ through the inflow pipe 310 and the discharge pipe 330. In a single rod cylinder to be linearly reciprocated, more specifically a double acting single rod cylinder, the first pocket 510 and the second pocket 530, the pipe for providing a piston static pressure bearing of the single rod cylinder according to the present invention The clearance 420, the first supply pipe 440, the shuttle valve 421, the second supply pipe 460 and the third supply pipe 480 is composed of.

As described above, the through pipe 420 passes through one side of the head 210 to communicate the front chamber 111 and the rear chamber 111 ′ through the inflow pipe 310 and the discharge pipe 330. The fluid filled in the front chamber 111 and the rear chamber 111 ′ is supplied to the first supply pipe 440 to be described later.

In addition, the first supply pipe 440 communicates the through pipe 420 and the first pocket 510 to supply the fluid supplied through the through pipe 420 to the first pocket 510.

Here, the shuttle valve 421 is installed along the through pipe 420 in the pipeline where the through pipe 420 and the first supply pipe 440 intersect, and the shuttle valve 421 is the piston 200. When the back and forth of the fluid to be filled in the rear chamber 111 'and the front chamber 111 is prevented from communicating with each other through the through-pipe 420.

That is, the shuttle valve 421 allows the fluid filled in the rear chamber 111 'to be supplied to the first supply pipe 440 through the through pipe 420 when the piston 200 moves forward, and at the same time, the front side of the piston 200. It blocks the flow into the chamber 111.

On the contrary, when the piston 200 moves backward, the fluid filled in the front chamber 111 'is supplied to the first supply pipe 440 through the through pipe 420 and at the same time flows into the rear chamber 111. Block it from becoming

On the other hand, the second supply pipe 460 forms a conduit inside the housing 100 to communicate the inflow pipe 310 and the second pocket 530 to the fluid supplied through the inflow pipe 310 To be supplied to the second pocket 530.

In addition, the third supply pipe 480 communicates the second pocket 530 and the discharge pipe 330 to supply the fluid supplied to the discharge pipe 330 to the second pocket 530.

As shown in B-B of FIG. 9, the inlet pipe 310 and the discharge pipe 330 communicate with each other through the second supply pipe 460 and the third supply pipe 480.

Here, the first supply check valve 461 and the second supply check valve 481 are installed on the pipes of the second supply pipe 460 and the third supply pipe 480 to move the piston 200 forward and backward. The fluid flowing through the 310 and the discharge pipe 330 is supplied in one direction.

That is, when the piston 200 moves forward, the fluid flowing into the inlet pipe 310 is supplied with the second pocket 530 through the second supply pipe 460 by opening the first supply check valve 461. In addition, the second supply check valve 481 is blocked to prevent the fluid of the second supply pipe 460 from flowing into the discharge pipe 330 through the third supply pipe 480.

On the contrary, when the piston 200 moves backward, the fluid flowing into the discharge pipe 330 opens the second supply check valve 481 to supply the second pocket 530 through the third supply pipe 480. In addition, the first supply check valve 461 is blocked to prevent the fluid of the third supply pipe 480 from flowing into the inlet pipe 310 through the second supply pipe 460.

This is because the inlet pipe 310 and the discharge pipe 330 which is a feature of the present invention and the pipes for supplying fluid to the first pocket 510 and the second pocket 530 communicate with each other, the housing 100 There is no need to install a separate fluid supply line outside of).

The fluid supply structure for forming the static pressure bearing of the second embodiment of the piston static pressure bearing of the single rod cylinder according to the present invention has been described above, and the fluid discharge structure will be described next.

The fluid discharge structure of the second embodiment of the piston hydrostatic bearing of the single rod cylinder according to the present invention is the first labyrinth seal portion 610 and the second labyrinth seal portion 630, the first discharge pipe 720, the second discharge pipe 740 ) And a third discharge pipe 760.

As such, the first discharge pipe 720 communicates with the first labyrinth seal part 610, the front chamber 111, and the rear chamber 111 ′ when the piston 200 moves forward and backward, and the first pocket. The fluid leaking from the 510 is recovered from the first labyrinth seal 610 and discharged to the front chamber 111 and the rear chamber 111 ′ through the first discharge pipe 720.

Here, a first discharge check valve 721 including a front first discharge check valve 721a and a rear first discharge check valve 721b is installed on the pipeline of the first discharge pipe 720, and the piston 200 is provided. ) Back and forth, the fluid recovered in the first labyrinth seal portion 610 is discharged in one direction through the first discharge pipe (720).

That is, the fluid recovered from the first labyrinth seal portion 610 when the piston 200 is advanced is the front first discharge check valve 721a is opened through the first discharge pipe 720, the front chamber ( 111, and the rear first discharge check valve 721b is blocked to prevent the rear discharge chamber 720 from being discharged to the rear chamber 111 ′ through the first discharge pipe 720.

On the contrary, when the piston 200 is retracted, the fluid recovered from the first labyrinth seal 610 is opened through the first discharge pipe 720 and the rear first discharge check valve 721b is opened. Discharged into the chamber 111, and in addition, the front first discharge check valve 721a is blocked to prevent the discharge to the front chamber 111 through the first discharge pipe (720).

On the other hand, the second discharge pipe 740 communicates the second labyrinth seal portion 630 and the second supply pipe 460 to the fluid leaked from the second pocket 530 when the piston 200 is reversed The second labyrinth seal 630 is recovered and discharged to the second supply pipe 460 through the second discharge pipe 740.

Here, a second discharge check valve 741 is installed on the pipeline of the second discharge pipe 740, and the fluid recovered from the second labyrinth seal part 630 when the piston 200 is retracted is transferred to the second discharge pipe 740. Discharge in one direction through the discharge pipe (740).

That is, the fluid recovered from the second labyrinth seal part 630 when the piston 200 retracts is opened by the second discharge check valve 741 through the second discharge pipe 740 to allow the second supply pipe ( 460 is discharged to the discharge pipe 330 through the third supply pipe 760 is blocked by the third discharge check valve 761, which will be described later.

On the contrary, the third discharge pipe 760 communicates with the second labyrinth seal part 630 and the discharge pipe 330 so that the fluid leaking from the second pocket 530 when the piston 200 is advanced. The second labyrinth seal 630 is recovered and discharged to the discharge pipe 330 through the third discharge pipe 760.

As shown in D-D of FIG. 9, the inlet pipe 310 and the discharge pipe 330 communicate with each other through the second supply pipe 460 and the third supply pipe 480.

Here, a third discharge check valve 761 is installed on the pipeline of the third discharge pipe 760, and the fluid recovered from the second labyrinth seal part 630 when the piston 200 is moved forward is transferred to the third discharge pipe 760. Discharge in one direction through the discharge pipe (760).

That is, the fluid recovered from the second labyrinth seal part 630 when the piston 200 is advanced is opened through the third discharge pipe 760 so that the third discharge check valve 761 is opened to discharge the discharge pipe 330. ) And the second discharge check valve 741 is blocked to prevent the second discharge pipe 740 from being discharged to the second supply pipe 460.

This is because the first labyrinth seal portion 610 and the second labyrinth seal portion 630 and the inlet pipe 330 and the discharge pipe 330 which is a feature of the present invention to communicate with each other, the outside of the housing 100 There is no need to install a separate fluid discharge line.

Hereinafter, referring to FIG. 11, a third preferred embodiment of the piston hydrostatic bearing of the single rod cylinder according to the present invention will be described in detail.

Fig. 11 is a side view showing the construction of a third preferred embodiment of a piston hydrostatic bearing of a single rod cylinder according to the present invention.

First, referring to FIG. 11, a configuration of a third preferred embodiment of a piston hydrostatic bearing of a single rod cylinder according to the present invention will be described.

Here, the description overlapping with the first preferred embodiment or the second preferred embodiment of the piston hydrostatic bearing of the single rod cylinder according to the present invention will be omitted.

As illustrated in FIG. 11, the piston 200 moves forward and backward by supplying and discharging fluid to the front chamber 111 and the rear chamber 111 ′ through the inflow pipe 310 and the discharge pipe 330. In a single rod cylinder to be linearly reciprocated, more specifically a double acting single rod cylinder, the first pocket 510 and the second pocket 530, the pipe for providing a piston static pressure bearing of the single rod cylinder according to the present invention The clearance 420, the first supply pipe 440, the shuttle valve 421 and the second supply pipe 490 is composed of.

The second supply pipe 490 forms a conduit inside the housing 100 to communicate the second pocket 530 with the outside of the housing 100, and by the fluid supplied through the second supply pipe 490. The positive pressure bearing is formed in the second pocket 530.

The second supply pipe 490 may operate independently of the operation of the cylinder to supply fluid to the second pocket 530.

As described above, the fluid supply structure for forming the static pressure bearing of the third preferred embodiment of the piston static pressure bearing of the single rod cylinder according to the present invention has been described, and the fluid discharge structure will be described next.

The fluid discharge structure of the third preferred embodiment of the piston hydrostatic bearing of the single rod cylinder according to the present invention includes a first labyrinth seal part 610 and a second labyrinth seal part 630, a first discharge pipe 720 and a second discharge pipe ( 790).

The second discharge pipe 790 communicates the outside of the second labyrinth seal part 630 and the housing 100, thereby allowing fluid leaking from the second pocket 530 to the second labyrinth seal part 630. ) To be discharged to the outside of the housing 100 through the second discharge pipe 790.

The second discharge pipe 790 is operated independently of the operation of the cylinder to discharge the fluid recovered from the second labyrinth seal 630 to the outside of the housing 100.

The third preferred embodiment of the piston hydrostatic bearing of the single rod cylinder according to the present invention is modified in the second embodiment described above, and is supplied from the outside of the cylinder to the first pocket 510 and the second pocket 530. It is possible to form a separate fluid supply pipe and the discharge pipe of the fluid recovered from the first labyrinth seal 610 and the second labyrinth seal 630.

As described above, it can be seen that the basic idea is to provide a piston static pressure bearing of a single rod cylinder, which does not need to install a separate fluid supply and discharge line for forming a static pressure bearing outside the cylinder. Of course, many other variations are possible for a person of ordinary knowledge.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piston hydrostatic bearing of a single rod cylinder, and is applicable to the field of piston hydrostatic bearings of a single rod cylinder, which does not need to install a separate fluid supply and discharge line for forming the hydrostatic bearing outside the cylinder.

Claims

The chamber 110 is front-sided by a housing 100 including a chamber 110 and a rod guide 130 and a head 210 accommodated in the housing 100 and formed at a rear end of the rod 230. A piston 200 partitioned into a chamber 111 and a rear chamber 111 ', and an inlet pipe communicating with the outside of the housing 100 and the rear chamber 111' through one side of the housing 100. In the one-rod cylinder including a 310 and a discharge pipe 330 for passing through the other side of the housing 100 to communicate the outside of the housing 100 and the front chamber 111,

A plurality of first pockets 510 formed on the outer circumferential surface along the circumferential direction of the head 210, and a plurality of second pockets 530 formed on the inner circumferential surface along the circumferential direction of the rod guide 130;

A first supply pipe 410 forming a pipe in the head 210 to communicate the rear chamber 111 'and the first pocket 510; And,

And a second supply pipe 430 forming a pipe in the housing 100 to communicate the inflow pipe 310 with the second pocket 530.

The piston of the single rod cylinder, characterized in that the hydrostatic bearing is formed in the first pocket 510 and the second pocket 530 by the fluid supplied through the first supply pipe 410 and the second supply pipe 430. Hydrostatic bearings.
The method of claim 1,

An orifice (800) is provided at the inlet of the first pocket (510) and the second pocket (530) piston static pressure bearing of the single rod cylinder.
The method of claim 1,

A first labyrinth seal part 610 is formed on the front and rear sides of the first pocket 510, and a first discharge pipe 710 is provided to communicate the first labyrinth seal part 610 and the front chamber 111. A piston static pressure bearing of a single rod cylinder, characterized in that.
The method of claim 1,

A second labyrinth seal part 630 is formed on the front and rear sides of the second pocket 530, and a second discharge pipe 730 is provided to communicate the second labyrinth seal part 630 and the front chamber 111. A piston static pressure bearing of a single rod cylinder, characterized in that.
The chamber 110 is front-sided by a housing 100 including a chamber 110 and a rod guide 130 and a head 210 accommodated in the housing 100 and formed at a rear end of the rod 230. A piston 200 partitioned into a chamber 111 and a rear chamber 111 ', and an inlet pipe communicating with the outside of the housing 100 and the rear chamber 111' through one side of the housing 100. In the one-rod cylinder including a 310 and a discharge pipe 330 for passing through the other side of the housing 100 to communicate the outside of the housing 100 and the front chamber 111,

A plurality of first pockets 510 formed on the outer circumferential surface along the circumferential direction of the head 210, and a plurality of second pockets 530 formed on the inner circumferential surface along the circumferential direction of the rod guide 130;

A through tube 420 passing through one side of the head 210 to communicate the front and rear chambers 111 and 111 ';

A first supply pipe 440 communicating the through pipe 420 and the first pocket 510; and

A shuttle valve 421 installed on a passage of the through tube 420 in a passage where the through tube 420 and the first supply pipe 440 intersect;

A second supply pipe 460 forming a pipe in the housing 100 to communicate the inflow pipe 310 with the second pocket 530; And,

And a third supply pipe 480 for communicating the discharge pipe 330 and the second pocket 530.

A hydrostatic bearing is formed in the first pocket 510 and the second pocket 530 by the fluid supplied through the first supply pipe 440, the second supply pipe 460, and the third supply pipe 480. Piston bearing of single rod cylinder.
The method of claim 5,

An orifice (800) is provided at the inlet of the first pocket (510) and the second pocket (530), the piston static pressure bearing of the single rod cylinder.
The method of claim 5,

Piston static pressure bearing of a single-rod cylinder, characterized in that the first supply check valve 461 and the second supply check valve 481 is installed on the passage of the second supply pipe 460 and the third supply pipe 480.
The method of claim 5,

The first labyrinth seal part 610 is formed at the front and rear sides of the first pocket 510, and the first discharge pipe 720 communicates the first labyrinth seal part 610 and the front and rear chambers 111 and 111 ′. ) Is provided, wherein the first discharge check valve (721) is installed on the pipeline of the first discharge pipe (720).
The method of claim 5,

A second labyrinth seal part 630 is formed on the front and rear sides of the second pocket 530, and a second discharge pipe 740 is provided to communicate the second labyrinth seal part 630 with the second supply pipe 460. And a second discharge check valve 741 is installed on the pipeline of the second discharge pipe 740.
The method of claim 9,

A third discharge pipe 760 is provided to communicate the second labyrinth seal part 630 and the discharge pipe 330, and a third discharge check valve 761 is installed on the pipeline of the third discharge pipe 760. A piston static pressure bearing of a single rod cylinder, characterized in that the.
The chamber 110 is front-sided by a housing 100 including a chamber 110 and a rod guide 130 and a head 210 accommodated in the housing 100 and formed at a rear end of the rod 230. A piston 200 partitioned into a chamber 111 and a rear chamber 111 ', and an inlet pipe communicating with the outside of the housing 100 and the rear chamber 111' through one side of the housing 100. In the one-rod cylinder including a 310 and a discharge pipe 330 for passing through the other side of the housing 100 to communicate the outside of the housing 100 and the front chamber 111,

A plurality of first pockets 510 formed on the outer circumferential surface along the circumferential direction of the head 210, and a plurality of second pockets 530 formed on the inner circumferential surface along the circumferential direction of the rod guide 130;

A through tube 420 passing through one side of the head 210 to communicate the front and rear chambers 111 and 111 ';

A first supply pipe 440 communicating the through pipe 420 and the first pocket 510; and

A shuttle valve 421 installed on a pipe of the through pipe 420 in a pipe line where the through pipe 420 and the first supply pipe 440 cross each other; And,

And a second supply pipe 490 forming a conduit inside the housing 100 to communicate the second pocket 530 with the outside of the housing 100.

The piston of the single rod cylinder, characterized in that the static pressure bearing is formed in the first pocket 510 and the second pocket 530 by the fluid supplied through the first supply pipe 440 and the second supply pipe 490. Hydrostatic bearings.
The method of claim 11,

An orifice (800) is provided at the inlet of the first pocket (510) and the second pocket (530) piston static pressure bearing of the single rod cylinder.
The method of claim 11,

The first labyrinth seal part 610 is formed at the front and rear sides of the first pocket 510, and the first discharge pipe 720 communicates the first labyrinth seal part 610 and the front and rear chambers 111 and 111 ′. ) And a first discharge check valve (721) is installed on the pipe of the first discharge pipe.
The method of claim 11,

A second labyrinth seal part 630 is formed on the front and rear sides of the second pocket 530, and a second discharge pipe 790 is provided to communicate the outside of the housing 100 with the second labyrinth seal part 630. A piston static pressure bearing of a single rod cylinder, characterized in that the.