WO2018074868A1

WO2018074868A1 - Hydraulic motor

Info

Publication number: WO2018074868A1
Application number: PCT/KR2017/011612
Authority: WO
Inventors: 박영선
Original assignee: 박영선
Priority date: 2016-10-20
Filing date: 2017-10-19
Publication date: 2018-04-26
Also published as: CN109891088B; KR101811422B1; CN109891088A

Abstract

The present invention relates to a hydraulic motor that operates by means of a fluid such as a gas, air, or oil for example. The hydraulic motor according to the present invention includes: a first housing part and a second housing part, in which are formed a fluid inflow hole through which a fluid is introduced from the outside, and a fluid outflow hole through which an introduced fluid is discharged to the outside; a cylinder block rotatably disposed between the first housing part and the second housing part; and a plurality of pistons, which are disposed in the cylinder block and reciprocate radially. A compression spring is provided behind the piston. A guide roller is mounted to a radial outer surface of the piston, and an eccentric path part in which a groove is formed as a path along which the guide roller moves is provided on the exterior of the cylinder block to which the guide roller corresponds. The cylinder block is rotated by the radial movement of the pistons caused by a sequential pressure supply of the fluid introduced through the fluid inflow hole. The hydraulic motor according to the present invention has an advantage in that the hydraulic motor continuously rotates depending on the supply of fluid, and the piston is driven stably in the cylinder block. Also, according to the present invention, there is an advantage in which, even when the operation of an output shaft is impaired by an external force, the fluid may be directly supplied to a space behind the piston to maintain smoother operation without loss of the fluid.

Description

Fluid motor

The present invention relates to a fluid motor operated by a fluid such as, for example, gas, air, oil.

Most of the motors in the industry are powered by electricity. As such, the motors driven by electricity are provided with gears as necessary in front of the rotation drive shaft thereof. Such gears allow power to be directly transmitted to various mechanical devices, or to power by mediating means such as belts.

Besides motors driven by electricity, there are tools driven by air, such as air grinders, in the industry. Air-operated tools such as air grinders adopt a structure that is operated by the force of air supplied by an air supply means such as an air compressor.

However, it is used only for a specific purpose by the pressure of a fluid such as air and is not used as a general purpose motor.

Patents related to the present invention may be referred to the Republic of Korea Patent Publication No. 10-1996-0034758 (published October 24, 1996, the name of the invention "fluid force motor").

SUMMARY OF THE INVENTION The present invention has been made to solve the problems of the prior art, and a first object of the present invention is to provide a fluid motor that is driven in a selective direction by a fluid.

A second object of the present invention is to provide a fluid motor that can be stably driven in a miniaturized state.

It is a third object of the present invention to provide a fluid motor capable of driving at high speed even in a miniaturized state through stable movement of a piston sliding radially in a cylinder block.

It is a fourth object of the present invention to provide a fluid motor having a structure which does not affect or hardly affect the supply of fluid to the rear of the piston even if there is an obstacle in the driving of the drive shaft.

In order to achieve the above and other objects, the present invention,

A first housing part and a second housing part having a fluid inlet through which fluid from the outside flows in and a fluid outlet through which the inflowed fluid is discharged outwardly;

And a cylinder block rotatably disposed between the first housing portion and the second housing portion and a plurality of pistons disposed within the cylinder block and reciprocating radially.

The rear of the piston is provided with a compression spring,

A guide roller is mounted on the radially outer surface of the piston, and an eccentric track portion is provided on the outer side of the cylinder block corresponding to the guide roller, and a groove is formed as a track for moving the guide roller.

The cylinder block is rotated by the radial movement of the piston by the sequential pressure supply of the fluid introduced through the fluid inlet port provides a fluid motor.

In the present invention, between the first housing portion and the cylinder block, on the one hand the fluid introduced through the fluid inlet is supplied to the rear space of the piston through the cylinder block, and on the other hand the piston It is characterized in that the switching valve unit is configured to discharge the fluid filled in the rear space of the through the fluid outlet.

In the present invention, the switching valve unit is provided to be rotatable with respect to the first housing portion, the fluid inlet is formed in the axial direction, the end of the portion in which the fluid inlet is formed is provided in the cylinder block It is formed to be fluidly connected only to the rear of the portion of the piston, the rear of the remaining portion of the piston is characterized in that it is configured to be in fluid communication with the fluid outlet by the open groove.

In the present invention, a part of the switching valve unit is configured to directly supply fluid to a part of the piston disposed in the cylinder block, and another part of the switch valve unit is configured to supply fluid from a part of the piston disposed in the cylinder block. It is characterized in that it is configured to be discharged directly.

In the present invention, the rotation direction of the cylinder block is switched by the rotation operation of the switching valve unit.

The fluid motor according to the present invention rotates continuously depending on the supply of fluid, and has the advantage that the piston is stably driven in the cylinder block.

In addition, according to the present invention, even when the output shaft is disturbed in operation due to external force, the fluid is directly supplied to the rear space of the piston without loss of the fluid, there is an advantage that can maintain a smooth operation.

1 is a perspective view schematically showing a fluid motor according to one preferred embodiment of the present invention.

FIG. 2 is an exploded perspective view of the fluid motor shown in FIG. 1.

3 is an exploded view illustrating the cylinder block and the piston and the eccentric track portion which are radially slidably disposed inside the cylinder block shown in FIG. 2.

4 is an exploded perspective view of the switching valve unit as a component of the fluid motor shown in FIG. 1.

5 shows a fluid inlet and outlet path of a fluid motor according to one preferred embodiment of the present invention.

6 is a view showing the operating principle of the fluid motor according to one preferred embodiment of the present invention.

Description of the main parts of the drawing

100: housing

100A: first housing part

100B: 2nd housing part

300: cylinder block

302: cylinder block side fluid passage

350: output shaft

400: piston

410: guide roller

420: compression spring

500: switching valve unit

501: direction change operation bar

502: fluid valve path of the switching valve unit side

504: fluid flow path

506: fluid supply passage

510: pneumatic input chamber

520 Pneumatic discharge chamber

522: longitudinal groove

524: fluid drain groove

Hereinafter, the present invention will be described in more detail with reference to the accompanying exemplary drawings. In the description of the present invention, descriptions of already known functions or configurations will be omitted to clarify the gist of the present invention. Also, like reference numerals denote like elements throughout the specification.

1-6 show a fluid motor according to one preferred embodiment of the present invention.

First, referring to FIG. 1, a fluid motor according to one preferred embodiment of the present invention includes a first housing portion 100A and a second housing portion 100B as a housing 100. The first housing portion 100A is formed with a fluid inlet 102 serving as a passage through which the fluid flows in and a fluid outlet 104 serving as a passage through which the fluid inside is discharged.

In addition, a shaft 350 as an output end is rotatably provided at the center of the second housing portion 100B.

2, a cylinder block 300 is rotatably disposed with respect to the first housing portion 100A and the second housing portion 100B between the first housing portion 100A and the second housing portion 100B. It is.

The cylinder block 300 is divided into a first cylinder block portion 300A and a second cylinder block portion 300B to facilitate assembly of the piston 400 disposed therein and its components. An eccentric track part 600 is disposed outside the cylinder block, and the eccentric track part 600 is rotated with respect to the first housing part 100A or the second housing part 100B by elastic fixing means made of rubber. It is firmly fixed without.

In the present invention, the bearing is provided in the rotation part for smoother rotation of the cylinder block 300. The switching valve unit 500 is provided at the front end of the rotating shaft of the cylinder block 300. Detailed description thereof will be provided later.

Referring to FIG. 3, a plurality of pistons 400 are slidably disposed radially inside the cylinder block 300. These pistons 400 are radially expanded and contracted in response to the pressure supply of the fluid flowing through the fluid inlet 102 formed in the first housing portion 100A and the pressure release of the fluid discharged through the fluid outlet 104. It is composed.

A guide roller 410 is mounted in front of each piston 400. The eccentric track portion 600 corresponding to the piston side guide roller 410 is formed with a groove 602 as an eccentric track moving by the guide roller 410 is constrained. The structure of the eccentric track 602 of this groove structure is better shown in FIG. In the present invention, the expansion and contraction distance of the piston 400 is adjusted with the help of the eccentric orbit 602 so that the cylinder block 300 rotates.

In addition, compression springs 420 are disposed at the rear of each piston 400. The compression spring 420 allows the piston 400 to expand radially even when there is no supply of compressed air so that the guide roller 410 mounted at the front of the piston 400 has an eccentric track (600). 602).

5 and 6 together with FIG. 3, the fluid inlet 102 of the first housing portion 100A is located at the inner center of the cylinder block 300, in particular at the inner center of the first cylinder block portion 300A. And a fluid passageway 302 configured to be in fluid communication with the fluid outlet 104. These fluid passages 302 are in particular configured to be in fluid communication with the rear space of the piston 400 individually as shown in FIGS. 6 and 7.

Referring to FIG. 4, in one preferred embodiment of the present invention, fluid introduced through the fluid inlet 102 between the first housing portion 100A and the cylinder block 300, on the one hand, is It is configured to be supplied to the rear space of the piston 400 through the cylinder block 300, and on the other hand the fluid filled in the rear space of the piston 400 is discharged through the fluid outlet 104 A switching valve unit 500 is provided.

5 and 6 together with FIG. 4, the switching valve unit 500 is formed with a fluid access path 502 fluidly connected to the fluid inlet 102 formed in the first housing part 100A. The switch valve unit 500 is formed of a hollow fluid movement path 504 fluidly connected to the fluid access path 502. A fluid supply path 506 for discharging fluid toward the outer circumferential surface is provided at the end of the fluid movement path 504, and the fluid supply path 506 is provided such that fluid is supplied to the rear of the at least one piston 400. A pneumatic input chamber 510 is provided, and a pneumatic discharge chamber 520 through which the introduced fluid is discharged is provided on the outer circumferential surface opposite to the pneumatic input chamber 510. The pneumatic discharge chamber 520 has a circumferential lengthwise groove 522 and a circumference at the end of the groove 522 so that the introduced fluid can be discharged through the fluid outlet 104 of the first housing portion 100A. The discharge groove 524 is formed in the direction. The discharge groove 524 serves to discharge the fluid through the fluid discharge port 104 formed in the first housing portion 100A as shown in FIG. Further, preferably, at least two fluid passages 302 of the cylinder block side fluid passage 302 are momentarily blocked between the pneumatic input chamber 510 and the pneumatic discharge chamber 520 as shown in FIG. It has a width.

As such, since the fluid is directly supplied to the rear space of the piston 400 via the switching valve unit 500, the supply of fluid is directly performed even when the output shaft 350 is disturbed by external factors. It is possible to generate even stronger output.

The front end of the switching valve unit 500 is equipped with a direction switching operation unit 501 formed to protrude to the outside so that the rotational direction of the fluid motor according to the present invention is switched according to the rotation operation thereof.

5 and 6, when a fluid, such as air, flows through the fluid inlet 102 formed in the first housing portion 100A, as shown by the A and arrows shown in FIG. 5, the switching valve unit 500. Flows into the pneumatic input chamber 510 through the fluid entry path 502, the fluid movement path 504, and the fluid supply path 506.

The fluid introduced into the pneumatic input chamber 510 is then supplied to the rear of the piston 400 through the cylinder block side fluid passage 302 which is continuously fluidly connected with the pneumatic input chamber 510. At this time, the guide roller denoted by reference numeral 410 of FIG. 6 is constrained by the eccentric track 602 of the eccentric track portion 600 which is fixed to the first housing part 100A or the second housing part 100B. The amount and force of the fluid are different so that the cylinder block 300 rotates in the selected direction.

On the contrary, the fluid filled in the rear of the piston 400 fluidly connected to the pneumatic discharge chamber 520 is discharged to the pneumatic discharge chamber 520, as shown by B and arrows shown in Figure 5, the pneumatic discharge The fluid discharged to the chamber 520 is discharged through the groove 522 formed in the longitudinal direction and the fluid discharge groove 524 formed successively as shown in FIG. This process is carried out continuously. The continuous fluid flow causes the cylinder block 300 to rotate in the set rotational direction of the user, and the rotation is transmitted through an output shaft 350 connected to the central axis of the cylinder block 300.

Although the above has been described with reference to preferred embodiments of the present invention, those skilled in the art will be able to variously modify and change the present invention without departing from the spirit and scope of the invention as set forth in the claims below. It will be appreciated.

Claims

A first housing part 100A and a second housing part 100B having a fluid inlet 102 through which fluid from the outside flows in and a fluid outlet 104 through which the inflowed fluid is discharged outwardly; And a cylinder block 300 rotatably disposed between the first housing portion 100A and the second housing portion 100B and a plurality of pistons 400 disposed in the cylinder block 300 and reciprocating radially. );

A compression spring 410 is provided behind the piston 400, and a guide roller 410 is mounted on a radially outer surface of the piston 400, and the cylinder block corresponding to the guide roller 410 is provided. The outer side of the 300 is provided with an eccentric track portion 600 is formed with a groove 602 as a track for moving the guide roller 410, the sequential of the fluid introduced through the fluid inlet (102) As a fluid motor that the cylinder block 300 is rotated by the radial movement of the piston 400 by the pressure supply,

Between the first housing portion 100A and the cylinder block 300, fluid introduced through the fluid inlet 102, on the other hand, passes through the cylinder block 300 to the rear space of the piston 400. On the other hand, there is provided a switching valve unit 500 configured to discharge the fluid filled in the rear space of the piston 400 through the fluid outlet 104,

The switching valve unit 500,

Is provided rotatably with respect to the first housing portion (100A), the fluid inlet 502 is formed in the axial direction, the end of the portion where the fluid inlet 502 is formed in the cylinder block 300 It is formed to be fluidly connected only to the rear of a portion of the provided piston 400, the rear of the remaining portion of the piston 400 is configured to be in fluid communication with the fluid outlet 104 by an open groove And

The switching valve unit 500 is formed in a hollow fluid movement path 504 fluidly connected to the fluid passageway 502, and at the end of the fluid movement path 504 is a fluid toward the outer circumferential surface side. Is provided with a fluid supply path 506 through which the fluid supply path 506 is provided, and a pneumatic input chamber 510 for supplying fluid to the rear of the at least one piston 400 is provided. The outer peripheral surface of the pneumatic input chamber 510 is provided with a pneumatic discharge chamber 520 through which the introduced fluid is discharged, and the fluid introduced into the pneumatic discharge chamber 520 has a fluid outlet (1) of the first housing part 100A. Elongated groove 522 in the longitudinal direction and discharge groove 524 in the circumferential direction is formed at the end of the groove 522 to the side to be discharged through 104, the pneumatic input chamber 510 and pneumatic discharge chamber 520 between the cylinder block side oil Passage 302 at least two fluid passages 302, the fluid motor, characterized in that is configured to have a width to be instantaneously shut off of.
The fluid motor according to claim 1, wherein the rotation direction of the cylinder block (300) is switched by a rotation operation of the switching valve unit (500).