KR101667537B1 - spherical bush of varibale capacity hydraulic piston motor - Google Patents

spherical bush of varibale capacity hydraulic piston motor Download PDF

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Publication number
KR101667537B1
KR101667537B1 KR1020150095920A KR20150095920A KR101667537B1 KR 101667537 B1 KR101667537 B1 KR 101667537B1 KR 1020150095920 A KR1020150095920 A KR 1020150095920A KR 20150095920 A KR20150095920 A KR 20150095920A KR 101667537 B1 KR101667537 B1 KR 101667537B1
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KR
South Korea
Prior art keywords
swash plate
bush
hydraulic motor
angle
spherical
Prior art date
Application number
KR1020150095920A
Other languages
Korean (ko)
Inventor
김동혁
이동훈
박원호
Original Assignee
훌루테크 주식회사
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Priority to KR1020150095920A priority Critical patent/KR101667537B1/en
Application granted granted Critical
Publication of KR101667537B1 publication Critical patent/KR101667537B1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03C—POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
    • F03C1/00—Reciprocating-piston liquid engines
    • F03C1/02—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders
    • F03C1/06—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinder axes generally coaxial with, or parallel or inclined to, main shaft axis
    • F03C1/0636—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinder axes generally coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block
    • F03C1/0644—Component parts
    • F03C1/0668—Swash or actuated plate
    • F03C1/0671—Swash or actuated plate bearing means or driven axis bearing means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F04B1/20—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block
    • F04B1/2014—Details or component parts
    • F04B1/2078—Swash plates
    • F04B1/2085—Bearings for swash plates or driving axles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C11/00—Pivots; Pivotal connections
    • F16C11/04—Pivotal connections
    • F16C11/06—Ball-joints; Other joints having more than one degree of angular freedom, i.e. universal joints
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C17/00—Sliding-contact bearings for exclusively rotary movement
    • F16C17/10—Sliding-contact bearings for exclusively rotary movement for both radial and axial load
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2360/00—Engines or pumps

Abstract

The present invention relates to a spherical bush for supporting a sieve plate of a variable capacity piston hydraulic motor. The variable capacity piston hydraulic motor includes: the sieve plate; and the bush installed in order for a tilting angle of the sieve plate to be changed. The bush comprises: a hub unit, wherein a rotation shaft penetrates the inner side of the hub unit and the outer side has a spherical shape to support the tilting of the sieve plate; and an inclined block integrally formed at a rear end of the hub unit, wherein a front surface has a side with two or more angles. Therefore, the spherical bush for supporting the sieve plate of the variable capacity piston hydraulic motor prevents over-tilting when an inclination angle of the sieve plate is changed and enables the inclination angle to be accurately changed.

Description

Technical Field [0001] The present invention relates to a spherical bush of a variable capacity piston hydraulic motor,

The present invention relates to a piston hydraulic motor, and more particularly, to a piston hydraulic motor which improves the structure of a spherical bush for supporting a swash plate constituting a hydraulic motor, so that when the inclination angle of the swash plate is changed, the inclination angle can be accurately changed To a spherical bush for supporting a swash plate of a variable displacement piston hydraulic motor according to a shape.

In general, a swash plate type piston hydraulic motor is used so that a large load can be provided for a traveling motor used in various industrial fields such as heavy equipment.

Particularly, in the case of the swash plate type hydraulic motor used for the above heavy equipment, the swash plate angle of the swash plate is changed so that the rotating speed can be changed to low speed and high speed according to the use purpose.

Regarding the variable displacement piston hydraulic motor having such a variable swash plate, it is as disclosed in, for example, JP-A Nos. 1984-002221, 10-0413948, and 10-1293455.

That is, as shown in the related art, the conventional variable displacement piston hydraulic motor is configured such that the pumping capacity of the pressure fluid can be changed by adjusting the angle of inclination of the swash plate mounted on the motor shaft.

However, in the case of such prior arts, there is a phenomenon that the swing of the swash plate is changed beyond the designed swash angle when the swash plate is changed from low speed to high speed, and it is difficult to keep the operating speed of the hydraulic motor constant there was.

Recently, as disclosed in Japanese Patent Laid-Open Nos. 10-2010-0049143 and 10-1058418, various structures for preventing over-travel of a swash plate constituting a hydraulic motor have been proposed.

However, the above-described conventional techniques are complicated and difficult to manufacture due to the request for changing the shape of the motor case or the cylinder block, and the assembling work is difficult due to the occurrence of interference during assembly of other accessories. There is a need for a new technology capable of solving the problem.

SUMMARY OF THE INVENTION It is an object of the present invention to improve the structure of a spherical bush for supporting a swash plate of a hydraulic motor, The present invention provides a spherical bush for supporting a swash plate of a variable displacement piston hydraulic motor in accordance with a new form in which the inclination angle can be accurately changed.

In order to accomplish the above object, the present invention provides a variable displacement piston hydraulic motor including a swash plate and a bush installed on the swash plate so as to change the angle of inclination of the swash plate, the variable displacement piston hydraulic motor comprising: The bush has a hub portion formed so as to penetrate the inside of the rotary shaft and an outer surface formed to be spherical in order to support the swash plate when the swash plate is flexed, and a front portion integrally formed at a rear end of the hub portion, And an inclined block formed of a plurality of planes.

The front surface of the inclined block forming the bush includes a first inclined surface inclined at an angle equal to the inclined angle for high-speed rotation of the swash plate, and a first inclined surface inclined from the end of the first inclined surface, And a second inclined surface inclined to have the same angle as that of the first inclined surface.

In addition, a connecting portion between the first inclined surface and the second inclined surface may be rounded in a front surface of the inclined block constituting the bush.

As described above, the spherical bush for supporting the swash plate of the variable displacement piston hydraulic motor according to the present invention allows the swash plate to accurately maintain the angular position of the swash plate when changing the inclination angle of the swash plate for low speed or high speed, Thus, the operation speed of the hydraulic motor can be kept constant.

Further, according to the present invention, since the structure for preventing the excessive warping of the swash plate is formed in the spherical bush for supporting the swash plate, it is possible to easily manufacture the swash plate for providing the anti-rolling prevention structure, Effect.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view of a variable capacity piston hydraulic motor according to an embodiment of the present invention,
FIG. 2 is a perspective view illustrating a portion where a swash plate is installed in an internal structure of a variable capacity piston hydraulic motor according to an embodiment of the present invention. FIG.
3 is a side view illustrating a portion where the swash plate is installed in the internal structure of the variable capacity piston hydraulic motor according to the embodiment of the present invention
4 is a sectional view for explaining the internal structure of a portion where the swash plate is installed in the internal structure of the variable capacity piston hydraulic motor according to the embodiment of the present invention
5 is a side view illustrating the operation of the spherical bush for swash plate of the variable displacement piston hydraulic motor according to the embodiment of the present invention at the time of high-
6 is a side sectional view for explaining the operation of the spherical bush for swash plate support of the variable displacement piston hydraulic motor according to the embodiment of the present invention at the time of high-
7 is a side view for explaining the operation of the spherical bush for swash plate of the variable displacement piston hydraulic motor according to the embodiment of the present invention at low speed operation
8 is a side sectional view for explaining the operation of the spherical bush for swash plate support of the variable displacement piston hydraulic motor according to the embodiment of the present invention at low speed operation

Hereinafter, preferred embodiments of the variable displacement piston hydraulic motor of the present invention will be described with reference to FIGS. 1 to 8 attached hereto.

1 is an exploded perspective view illustrating a portion where a swash plate is installed in an internal structure of a variable capacity piston hydraulic motor according to an embodiment of the present invention. FIG. 2 is a perspective view of a variable capacity piston according to an embodiment of the present invention. FIG. 3 is a perspective view illustrating a portion where a swash plate is installed in an internal structure of a variable capacity piston hydraulic motor according to an embodiment of the present invention. FIG. And FIG. 4 is a cross-sectional view illustrating an internal structure of a portion where a swash plate is installed in an internal structure of a variable capacity piston hydraulic motor according to an embodiment of the present invention.

As shown in these drawings, the variable displacement piston hydraulic motor according to the embodiment of the present invention includes a cylinder block 100, a swash plate 200, and a bush 300.

Here, the cylinder block 100 is formed as a circular block, and a through hole 110 through which a rotating shaft (not shown) passes is formed at the center. In addition, a through hole 110 is formed in the center of the through- And a piston chamber 120 through which fluid is introduced and discharged.

The swash plate 200 is a portion where a plurality of pistons 210 linearly reciprocating in the respective piston chambers 120 are fixedly installed. The swash plate 200 is inclined with respect to the front surface of the cylinder block 100, A plurality of coupling holes 240 to which the piston 210 is coupled along the perimeter of the opening hole 220 are formed and an opening hole 220 coupled to the hub 310 of the bush 300 to be described later is formed. . At this time, the swash plate 200 is configured so that its angle can be adjusted by a separate, not shown,

Reference numeral 230 denotes a head portion 230 for coupling one end of the piston 210 to the swash plate 200.

Particularly, in the embodiment of the present invention, the bush 300 supports the swash plate 200 in a manner that the bush 300 supports the swash plate 200, So that the swash plate 200 can always be maintained at an accurate inclination angle.

Hereinafter, the structure of the bush 300 will be described in more detail.

First, a bushing 300 according to an embodiment of the present invention includes a hub 310 and an inclined block 320.

Here, the hub 310 is provided as a mounting portion of the swash plate 210 to support the tilting of the swash plate 200, and a rotating shaft is installed to pass through the hub.

Particularly, the hub portion 310 is provided inside the hub portion 310 so as to penetrate the rotary shaft. In addition, the outer surface of the hub portion 310 is formed to be spherical in order to support the swash plate 200 when the swash plate 200 is flexed.

In addition, the inclined block 320 is a portion for preventing the swash plate 200 from being excessively warped when the swash plate 200 is flexed.

The inclined block 320 is integrally formed at the rear end of the hub 310, and the front surface of the inclined block 320 has a surface having two or more angles.

That is, the front surface of the inclined block 320 having the plurality of angles of two or more is inclined to form an angle equal to the inclined angle for high-speed rotation of the swash plate 200, And a second inclined surface 322 extending from an end of the swash plate 321 and inclined at an angle equal to the angle of inclination for low-speed rotation of the swash plate 200.

Such a structure prevents the back surface of the swash plate 200 from being supported by the first inclined surface 321 when the swash plate 200 is rotated at a high speed, The rear surface of the swash plate 200 can be supported by the second inclined surface 322 when the swash plate 200 is rotated at a low speed.

The inclined block 320 is formed as a block having a structure in which the inclined block 320 is extended outward from all the peripheral portions of the hub portion 310. However, the present invention is not limited thereto. That is, although not shown, the inclined block 320 having the first inclined plane 321 and the second inclined plane 322 may be formed only on both sides of the hub unit 310.

Meanwhile, in the embodiment of the present invention, the connection portion 323 between the first inclined surface 321 and the second inclined surface 322 is rounded in the front surface of the inclined block 320.

This is because when the inclination angle of the swash plate 200 is changed by the warping means in a state where the back surface of the swash plate 200 is supported by the first inclined surface 321, the swash plate 200 is not sharply inclined, So that the swash plate 200 can be smoothly tilted by the inclined swash plate 200 so that the swash plate 200 can be inclined to the second inclined surface 322 naturally along the swash plate 323.

As described above, in the embodiment of the present invention, the structure for preventing the oversheath of the swash plate 200 is formed in the motor case (not shown) or the cylinder block 100, 300 can prevent the design of the motor case or other components due to the change of the shape of the cylinder block 100 and the occurrence of interference in operation, .

Next, the operation of the bush 300 according to the embodiment of the present invention will be described with reference to FIGS. 5 to 8. FIG.

First, when the operation control for the high-speed rotation of the hydraulic motor is performed, the swash plate 200 is tilted at a small angle as compared with the case of low-speed rotation by the operation of the warping means.

In this case, the swash plate 200 is guided along the outer surface of the hub 310 of the bush 300 having a spherical surface. Thus, when the swash plate 200 is inclined along the outer surface of the hub 310, The lower surface of the rear surface of the bush 300 is brought into close contact with the first inclined surface 321 of the inclined block 320 of the bush 300. [

Therefore, the inclined block 320 of the bushing 300 can prevent the swaging of the swash plate 200, as shown in FIGS. 5 and 6.

On the other hand, when the operation control for the low-speed rotation of the hydraulic motor is performed, the swash plate 200 is tilted at a larger angle than that at the time of high-speed rotation by the operation of the warping means.

In this case, the swash plate 200 is guided along the outer surface of the hub 310 of the bush 300 having a spherical surface. Thus, when the swash plate 200 is inclined along the outer surface of the hub 310, The rear surface (the upper side portion of the rear surface in the drawing) is brought into close contact with the second inclined surface 322 of the front surface of the inclined block 320 of the bush 300.

Therefore, the inclined block 320 of the bushing 300 can prevent the over-travel of the swash plate 200, as shown in FIGS. 7 and 8.

In particular, when the hydraulic motor is changed from a high-speed rotation state to a low-speed rotation state, or from a low-speed rotation state to a high-speed rotation state, the rear surface of the swash plate 200 is in close contact with the first inclined surface 321, The rear surface of the swash plate 200 is tilted so as to be closely contacted with the first inclined surface 322 or in close contact with the first inclined surface 321 in a state of being closely attached to the second inclined surface 322. In this process, The angle of inclination due to the continuous inclination is changed instead of the instantaneous inclination angle.

As a result, the swash plate-supporting spherical bush 300 of the variable capacity piston hydraulic motor according to the present invention allows the swash plate 200 to accurately maintain the angular position of each state when changing the inclination angle of the swash plate 200 for low speed or high speed Accordingly, it is possible to prevent the occurrence of the overcurrent phenomenon, thereby making it possible to keep the operating speed of the hydraulic motor constant.

In addition, according to the present invention, since the structure for preventing the excessive warping of the swash plate 200 is formed on the spherical bush 300 for swash plate, manufacturing can be easily performed to provide the anti-skew prevention structure, Improvement can be achieved.

100. Cylinder block 110. Through-hole
120. Piston chamber 200. Swash plate
210. Piston 220. Aperture Ball
230. Head part 240. Coupling ball
300. Bush 310. Hub section
320. Inclined block 321. First inclined surface
322. Second inclined surface

Claims (3)

A variable capacity piston hydraulic motor comprising a swash plate (200) and a bush (300) installed to allow the swash plate (200) to change the angle of inclination,
The bushes 300
A hub portion 310 formed to have a spherical surface for supporting the swash plate 200 when the swash plate 200 is flexed,
The front surface of the hub unit 310 is integrally formed with the rear end of the hub unit 310. The front surface of the hub unit 310 includes an inclined block 320 having two or more surfaces having a plurality of angles,
The front surface of the inclined block 320 constituting the bush 300
A first inclined surface 321 inclined at an angle equal to the angle of inclination for high-speed rotation of the swash plate 200,
And a second inclined surface (322) extending from an end of the first inclined surface (321) to be inclined at an angle equal to the inclined angle for low-speed rotation of the swash plate (200). Spherical bush for supporting swash plate. delete The method according to claim 1,
Wherein a connecting portion between the first inclined surface (321) and the second inclined surface (322) is rounded in a front surface of the inclined block (320) constituting the bush (300) Spherical Bush.
KR1020150095920A 2015-07-06 2015-07-06 spherical bush of varibale capacity hydraulic piston motor KR101667537B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020150095920A KR101667537B1 (en) 2015-07-06 2015-07-06 spherical bush of varibale capacity hydraulic piston motor

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Application Number Priority Date Filing Date Title
KR1020150095920A KR101667537B1 (en) 2015-07-06 2015-07-06 spherical bush of varibale capacity hydraulic piston motor

Publications (1)

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KR101667537B1 true KR101667537B1 (en) 2016-10-20

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010196612A (en) * 2009-02-26 2010-09-09 Nabtesco Corp Hydraulic motor
JP2010242649A (en) * 2009-04-07 2010-10-28 Hitachi Constr Mach Co Ltd Axial piston type hydraulic rotary machine

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010196612A (en) * 2009-02-26 2010-09-09 Nabtesco Corp Hydraulic motor
JP2010242649A (en) * 2009-04-07 2010-10-28 Hitachi Constr Mach Co Ltd Axial piston type hydraulic rotary machine

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