KR101667539B1 - The automatic velocity switching device for hydraulic motor - Google Patents

The automatic velocity switching device for hydraulic motor Download PDF

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Publication number
KR101667539B1
KR101667539B1 KR1020150053135A KR20150053135A KR101667539B1 KR 101667539 B1 KR101667539 B1 KR 101667539B1 KR 1020150053135 A KR1020150053135 A KR 1020150053135A KR 20150053135 A KR20150053135 A KR 20150053135A KR 101667539 B1 KR101667539 B1 KR 101667539B1
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KR
South Korea
Prior art keywords
passage
plug
spool
guide
valve housing
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KR1020150053135A
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Korean (ko)
Inventor
이동훈
Original Assignee
훌루테크 주식회사
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Priority to KR1020150053135A priority Critical patent/KR101667539B1/en
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Publication of KR101667539B1 publication Critical patent/KR101667539B1/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
    • F03C1/003—Reciprocating-piston liquid engines controlling
    • F03C1/004—Reciprocating-piston liquid engines controlling speed-control
    • 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
    • F03C1/0678—Control
    • F03C1/0686—Control by changing the inclination of the swash plate
    • 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
    • F03C1/08—Distributing valve-gear peculiar thereto
    • F03C1/16—Speed controlling, equalising or cushioning

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Multiple-Way Valves (AREA)

Abstract

The present invention relates to an automatic speed change device for a hydraulic motor in which a speed change of a hydraulic motor is automatically performed and a user can easily control the speed change from outside the motor.
The automatic speed change device for a hydraulic motor according to the present invention comprises: a valve housing (100) having a through passage (110) formed therein; A spool 200 installed on the inner side of the through passage 110 so as to be slidable and having a plurality of recesses and protrusions formed on the outer surface thereof; A plug 300 and a fixing tab 400 fastened to one side and the other side of the through passage 110; An elastic member 500 disposed between the spool 200 and the plug 300 to allow the spool 200 and the plug 300 to be separated from each other by elasticity; A supply passage 600 formed in the valve housing 100 so that one end thereof communicates with the through passage 110 and guiding the main pressure to be supplied to the through passage 110; An air passage 610 formed inside the valve housing 100 and serving as a passage for the main pressure fluid, a guide passage 620, and the like. According to the present invention as described above, automatic speed change and speed change setting can be performed.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an automatic speed change device for a hydraulic motor,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic speed changing device for a hydraulic motor, and more particularly, to an automatic speed changing device for a hydraulic motor in which a speed change of a hydraulic motor is automatically performed, .

Generally, a hydraulic driving apparatus such as an excavator is used to generate a speed by classifying the hydraulic driving apparatus into a high speed (second speed) and a low speed (first speed).

The conventional hydraulic motor is limited by the flow rate discharged from the pump, and the maximum rotation speed is determined by the maximum flow rate supplied to the hydraulic motor, and the speed switching is performed manually.

For example, manually adjust the speed by turning on or off the mode button of the first (turtle) or second (rabbit) in the excavator. That is, when the 2nd speed button is turned on, the spool is pushed to the left side with the pilot pressure supply (50kg / cm2) to connect the flow path to the 2nd speed and when the hydraulic oil flows, the 2nd speed piston pushes the swash plate to maintain the minimum inclination And speeds up the rotation.

In recent years, a variable mechanism of a swash plate type hydraulic motor has been proposed in which a swash plate switching piston and a control valve are used to change the swash plate to a low speed state and a high speed state even during operation of a hydraulic motor. However, It is difficult to arbitrarily set the automatic speed changeover.

Patent No. 10-1058418

SUMMARY OF THE INVENTION It is therefore an object of the present invention to solve the above-mentioned problems of the prior art and to provide an automatic hydraulic motor in which the speed change of the first speed and the second speed is automatically performed in accordance with the change of the main pressure load when the steep- Speed switching device.

It is another object of the present invention to provide an automatic speed switching device for a hydraulic motor in which the user can arbitrarily adjust the speed change on the outside of the motor.

According to an aspect of the present invention, there is provided an automatic speed switching apparatus for a hydraulic motor, including: a valve housing (10) coupled to a housing (10) 100); A spool 200 installed on the inner side of the through passage 110 so as to be slidable and having a plurality of recesses and protrusions formed on the outer surface thereof; A plug 300 coupled to one end of the through passage 110 to shield one side of the through passage 110; A fixing tab 400 fastened to the other end of the through-hole 110 and having a passage hole 410 penetrating the other end of the through-hole 110 in the longitudinal direction; An elastic member 500 disposed between the spool 200 and the plug 300 to allow the spool 200 and the plug 300 to be separated from each other by elasticity; A supply passage 600 formed in the valve housing 100 so that one end thereof communicates with the through passage 110 and guiding the main pressure to be supplied to the through passage 110; An air passage 610 formed inside the valve housing 100 and filled with a fluid having an atmospheric pressure; And a guide passage 620 formed inside the valve housing 100 and guiding the fluid supplied through the atmospheric passage 610 to be supplied to the second-speed piston passage 630.

The plug 300 is installed in the through passage 110 and supports one end of the elastic member 500; And the mounting position in the through-flow passage 110 is adjustable from the outside of the valve housing 100.

The plug 300 includes a guide 310 inserted into the through passage 110 and supporting one end of the elastic member 500; A cap 320 coupled to the valve housing 100 and coupled to one end of the guide 310; A guide seal 330 and a cap seal 340 which are respectively provided in the guide 310 and the cap 320 to block the fluid in the through flow path 110 from leaking to the outside; .

The spool (200) includes a central passage (210) having one end opened at the center and guiding the fluid in the through passage (110) to pass therethrough; A drain hole 212 and an orifice hole 214 for guiding the fluid passing through the center channel 210 to be discharged to the outer surface; A flow path groove 220 formed to be recessed inwardly from the outer circumferential surface to form a space filled with the fluid passing through the supply path 600; And a moving groove 230 formed to be recessed inwardly from the outer circumferential surface and guiding the fluid introduced through the atmospheric flow passage 610 to be moved to the guide passage 620.

A left end 222 and a right end 224 are formed on the left and right sides of the flow path groove 220 and the outer end sizes of the left end 222 and the right end 224 are different from each other.

The automatic speed changing device for a hydraulic motor according to the present invention has the following effects.

In the present invention, when the pilot pressure continues to be supplied, the main pressure increases due to the load and the pilot pressure is overcome due to the load, so that the speed is automatically switched to the first speed (low speed). When going to the ground, the main pressure decreases due to the decrease of the load, and the pilot pressure automatically switches to the second speed. As described above, the present invention has an advantage that the speed can be automatically changed.

Further, in the present invention, the plug is screwed to the valve housing so that the plug can be adjusted by a user outside the motor. Accordingly, there is an advantage that the conversion time of the first and second speeds can be adjusted according to the user's control.

1 is a sectional view showing a configuration of a hydraulic motor in which a preferred embodiment of an automatic speed switching device for a hydraulic motor according to the present invention is adopted;
2 is a sectional view showing a configuration of a plug constituting an embodiment of the present invention;
3 is a sectional view showing a configuration of a spool constituting an embodiment of the present invention.
FIG. 4 is a use state diagram showing a state in which a first speed change is automatically performed according to an embodiment of the present invention; FIG.
5 is a use state diagram showing a state in which a second speed change is automatically performed according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of an automatic speed change device for a hydraulic motor according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a cross-sectional view of a hydraulic motor incorporating an automatic speed change device for a hydraulic motor according to the present invention.

The housing 10 and the valve housing 100 form the overall appearance of the hydraulic motor. Various components including the swash plate 20 are provided in the housing 10.

In the present invention, a swash plate type hydraulic motor is taken as an example. Since the internal structure and function of the swash plate type hydraulic motor are already known, the basic structure and operation description of the swash plate type hydraulic motor are omitted here.

The automatic speed changing device for a hydraulic motor according to the present invention comprises a plurality of configurations including the valve housing 100. That is, the automatic speed switching device for a hydraulic motor according to the present invention comprises a valve housing 100 in which a through-flow passage 110 is formed right and left, and a valve housing 100 installed to be slidable inside the through- A spool 200 having a plurality of protrusions and recesses formed therein and a plug 300 connected to one end of the through passage 110 to shield one side of the through passage 110, A fixing tab 400 which is fastened to the other end of the spool 200 and which has a passage hole 410 penetrating the spool 200 in a longitudinal direction and a fixing tab 400 which is provided between the spool 200 and the plug 300, And the plug 300 is spaced apart from the main body 100. The main body 100 is formed in the valve housing 100 so that one end thereof communicates with the through passage 110 and a main pressure is supplied to the through passage 110 A supply passage 600 formed on the inner side of the valve housing 100, Speed piston 620 to be supplied to the second-speed piston channel 630. The second-stage piston 620 is provided with an atmospheric passage 610 in which a passage having an atmospheric pressure is filled, And a guide passage 620 for guiding the air.

The valve housing 100 is coupled with the housing 10 as shown in the figure, and a through passage 110 is formed in a long side of the valve housing 100. Therefore, the housing 10 and the valve housing 100 form a schematic appearance of the hydraulic motor.

A spool (200) is embedded in the through-flow passage (110).

As shown in the figure, the spool (200) is provided with a sliding flow in the left and right inside the through passage (110), and a plurality of concavities and convexities are formed on its outer surface. That is, a step is formed on the outer surface to have a concavo-convex shape.

The detailed structure of the spool 200 will be described below.

A plug 300 is fastened to the left end of the through-flow passage 110. That is, as shown in the drawing, the plug 300 is screwed to the left end of the through-flow passage 110 to shield the left side of the through-flow passage 110.

The plug 300 is installed in the through passage 110 to support one end of the elastic member 500 and allows the user to adjust the mounting position inside the through passage 110 from outside the valve housing 100 .

That is, as shown in the figure, the plug 300 is screwed to the upper end of the left side surface of the valve housing 100. Therefore, when the user rotates the left end of the plug 300 exposed to the outside of the left side of the valve housing 100, the mounting position of the plug 300 moves left and right in the through-flow passage 110 do.

The plug 300 supports the left end of the elastic member 500 as shown in FIG. Accordingly, when the plug 300 is moved to the right by tightening the plug 300, the compressive force of the elastic member 500 is increased. On the contrary, when the plug 300 is released and the plug 300 is moved to the left The compressive force of the elastic member 500 will decrease.

The plug 300 is screwed into the valve housing 100, and the detailed structure thereof will be described below.

The fixing tab 400 is fastened to the right end of the through-passage 110. The fixing tab 400 is coupled to the right upper end portion of the valve housing 100 as shown in the figure, and a passage hole 410 penetrating right and left is formed inside. The flow passage hole 410 is a passage through which a fluid having a pilot pressure supplied by a pilot pump (not shown) passes.

Between the spool 200 and the plug 300, an elastic member 500 is further provided. The elastic member 500 elastically separates the spool 200 and the plug 300 from each other. That is, the elastic member 500 is formed of a compression spring, and the spool 200 and the plug 300 are pushed to the left and right by the compression force of the spring.

On the other hand, a supply passage 600 is formed to communicate with the right side of the through passage 110.

As shown in the drawing, a main passage 640 through which fluid having a main pressure (system pressure) flows is formed in the valve housing 100, and a parking passage 650 is formed in the main passage 640, Is connected to the lower side.

The parking passage 650 is a passage through which a parking brake fluid (not shown) is supplied.

The supply passage 600 is formed above the parking passage 650. Therefore, the fluid having the main pressure (system pressure) flowing through the main flow channel 640 through the supply flow channel 600 is guided to flow into the through flow channel 110.

An air passage 610 is further formed inside the valve housing 100. That is, in the central portion of the valve housing 100, the air passage 610 is formed as an upper portion and a lower portion as shown in FIG. The lower side of the atmosphere flow path 610 is connected to a system flow path (not shown) having a main pressure. Therefore, the air flow path 610 is always kept filled with the fluid having the main pressure.

A guide passage 620 is formed on the left side of the atmospheric flow passage 610. That is, as shown in the drawing, the guide passage 620 is vertically formed on the inner side of the valve housing 100, the upper end is connected to the through passage 110, and the lower end is connected to the second-speed piston passage 630 And is installed to communicate.

Therefore, the guide passage 620 serves to guide the fluid supplied through the atmospheric passage 610 to be supplied to the second-speed piston passage 630. That is, the fluid having the main pressure filled in the atmospheric flow passage 610 flows through the through-flow passage 110 and then flows to the second-speed piston passage 630 through the guide passage 620.

2 is a cross-sectional view of the structure of the plug 300. As shown in FIG.

The plug 300 includes a guide 310 inserted into the through passage 110 and supporting one end of the elastic member 500 and a guide 310 coupled to the valve housing 100 A cap 320 which is coupled to and supported by one end of the guide 310 and a guide 320 which is provided in each of the guide 310 and the cap 320 to block the fluid in the through passage 110 from leaking to the outside, A seal 330, a cap seal 340, and the like.

The guide 310 is formed in a cylindrical shape having a predetermined diameter and the right portion of the guide 310 is formed to have a relatively small outer diameter so as to be accommodated in the receiving portion of the elastic member 500 312 are formed.

A supporting step 314 is formed at the left end of the receiving part 312.

The support jaw 314 is formed to have an outer diameter larger than the outer diameter of the accommodating portion 312 to support the left end of the elastic member 500, as shown in the figure.

It is preferable that the left side portion of the support jaw 314 has an outer diameter larger than the outer diameter of the receiving portion 312, and the guide groove 316 is recessed inward.

The guide groove 316 is a portion where the guide seal 330 is mounted.

The cap 320 is a portion where the left end of the guide 310 is fitted. The cap 320 is screwed to the valve housing 100. That is, the cap 320 is coupled to the left end of the through-flow passage 110.

Specifically, the cap 320 includes an exposed portion 322 exposed to the left side of the valve housing 100 and a fastening portion 324 integrally formed on the right side of the exposed portion 322 .

The fastening portion 324 is inserted into the through-passage 110, and a male thread is formed on an outer surface of the fastening portion 324. [ Thus, the fastening portion 324 is screwed to the left side of the through-flow passage 110 in which a female thread is formed.

An insertion hole 324 'is formed in the coupling part 324 and a left end of the guide 310 is inserted into the insertion hole 324'. That is, the left side of the support tab 314 of the guide 310 is inserted into the insertion hole 324 '.

The cap 320 may be a head screw. Accordingly, the exposed portion 322 of the cap 320 corresponds to the head portion of the screw, and the outer surface thereof is formed in a hexagonal shape so that the user can rotate the tool using the tool.

Also, a coupling hole 322 'penetrating right and left is formed on the inner side of the exposed portion 322 as well. A wrench head screw or the like which can be rotated by a user with a wrench or the like is screwed to the fastening hole 322 '.

The inner diameter of the fastening hole 322 'is smaller than the inner diameter of the insertion hole 324'. Therefore, the guide 310 inserted into the insertion hole 324 'is not exposed to the left side of the exposed portion 322.

At the left end of the fastening portion 324, a cap hole 326 recessed inward is formed. The cap hole 326 is a portion where the cap seal 340 is mounted.

The guide seal 330 and the cap seal 340 are oil seals. Therefore, the guide seal 330 is preferably made of an elastic material such as rubber, and the guide seal 330 is formed to have a smaller diameter than the cap seal 340.

3 is a cross-sectional view of the spool 200. As shown in FIG.

As shown, the spool 200 includes a central passage 210 formed at one end of the spool 200 and guiding the fluid in the through passage 110 to pass through the center passage 210, A drain hole 212 and an orifice hole 214 for guiding a fluid to be discharged to the outer surface, and a fluid passage formed to be recessed inwardly from the outer circumferential surface to form a space through which the fluid passing through the supply passage 600 flows, And a moving groove 230 formed to be recessed inwardly from the outer circumferential surface and guiding the fluid introduced through the atmospheric flow passage 610 to be moved to the guide passage 620.

As shown in the figure, the center channel 210 is formed so as to be open at the left side and shield at the right side. The center channel 210 is formed long in the center of the spool 200.

The drain hole 212 and the orifice hole 214 allow the fluid to move between the inside and the outside of the spool 200. The orifice hole 214 has a smaller hole size than the drain hole 212 So that it is difficult to move the fluid, so that it has a function of having a time delay effect when changing the second speed.

As shown in the drawing, the flow path groove 220 is formed to have a predetermined size on the right side of the spool 200, and a left end 222 and a right end 224 Respectively. That is, left and right ends 222 and 224 having outer diameters larger than the outer diameters of the flow grooves 220 are formed on the right and left sides of the flow grooves 220, respectively.

The outer diameter sizes of the left end 222 and the right end 224 are different from each other. More specifically, the right end 224 formed on the right side of the left end 222 formed on the left side of the flow path groove 220 has a larger outer diameter. For example, the outer diameter of the left end 222 has a diameter of 10.4 mm, and the outer diameter of the right end 224 has a diameter of 11 mm.

Therefore, the pressure of the fluid from the supply passage 600 acts on the right and left sides of the flow path groove 220 in the flow path groove 220. That is, the main pressure of the fluid flowing into the flow path groove 220 acts on the left end 222 and the right end 224, respectively. At this time, the direction of the right end 224 (right side) Lt; / RTI >

Since the outer diameter of the right end 224 is larger than the outer diameter of the left end 222, the fluid filled in the flow path groove 220 The area of the right and left side surfaces contacting with each other naturally becomes larger than the left side end 222 of the right end 224. Therefore, the force applied from the fluid filled in the flow path groove 220 becomes the right end 224 direction (rightward direction).

The moving groove 230 is formed in the left portion of the spool 200 and the main pressure fluid of the atmospheric flow passage 610 flows through the moving groove 230 into the guide passage 620 Movement (when the second speed is switched) becomes possible.

Hereinafter, the operation of the automatic speed changing device for a hydraulic motor according to the present invention will be described with reference to FIGS. 4 and 5. FIG.

First, Fig. 4 shows a state at first speed (low speed) operation. As shown in the drawing, a pilot pressure (for example, 50 kgf / cm 2) is applied from the right side of the fixing tab 400. That is, the pressure of the fluid discharged from the pump (not shown) (50 kgf / cm 2) is applied, and the right end of the spool 200 is pushed to the left (① direction).

A main pressure (for example, 233 kgf / cm 2) supplied through the supply passage 600 is applied to the flow path groove 220. Therefore, the force in the rightward direction (direction 2) and the force in the left direction (direction 3) are generated by the fluid in the flow path groove 220, respectively.

In addition, a force in the rightward direction (direction of?) Pushes the spool 200 to the right side by the elastic member 500.

In this first-speed operation, since the condition is the same as steep slope, a large load is generated, and the main pressure becomes as large as 233 kgf / cm 2. Therefore, since the force in the right direction (direction 2) acting by the fluid of the flow path groove 220 relatively is larger than the force in the left direction (direction 3), the spool 200 is moved to the right side And maintains one state. That is, at this time, since the force of (1 + 3) is smaller than the force of (2 + 4), the spool (200) moves to the right.

Therefore, at this time, since the atmospheric passage 610 and the guide passage 620 are not communicated with each other, the main pressure fluid of the atmospheric passage 610 is not transmitted to the second-speed piston passage 630.

Then, if you run down the slope, the load will decrease and the main pressure (system pressure) of the fluid will decrease (eg 119kgf / ㎠).

As a result, the spool 200 moves to the left as shown in FIG. That is, at this time, since the force of (1 + 3) is greater than the force of (2 + 4), the spool 200 moves to the left.

As shown in FIG. 5, when the spool 200 moves to the left, the atmospheric flow passage 610 and the guide passage 620 are communicated with each other by the moving groove 230. Therefore, the fluid of the main pressure filled in the atmospheric flow passage 610 is moved to the second-speed piston passage 630 through the guide passage 620, so that the second-speed (high-speed) operation is automatically performed.

In this state, when the load increases due to the ascent or the like, the automatic return to the state of FIG. 4 is automatically performed. The speed change is automatically performed due to the lateral flow of the spool 200.

Then, the user can adjust the time point of the speed change as described above. That is, it is possible to adjust the elastic force of the elastic member 500 or to adjust the outer diameter of the left end 222 and the right end 224 during manufacturing.

Next, it is possible to adjust by the operation of tightening or loosening the plug 300 by the user during use. That is, when the plug 300 is tightened, the plug 300 moves to the right side, so that the compressive force of the elastic member 500 increases and the pushing force of the spool 200 to the right increases. Conversely, 300 is loosened, the plug 300 moves to the left, so that the compressive force of the elastic member 500 is reduced, and the force pushing the spool 200 to the right is reduced.

With this adjustment, the force of '① + ③' and '② + ④' is changed, so that it is possible to set the speed automatic control.

The scope of the present invention is not limited to the above-described embodiments, and many other modifications based on the present invention will be possible to those skilled in the art within the scope of the present invention.

100. Valve housing 110. Through-
200. Spool 300. Plug
400. Fixing tab 410. Euro hole
500. Elastic member 600. Supply channel
610. Standby Euro 620. Guide Euro
630. Second-speed piston channel 640. Main channel
650. Parking channel

Claims (5)

A valve housing 100 coupled to the housing 10 and formed with a through passage 110 therein and a plurality of recesses and protrusions formed on an outer surface of the valve housing 100 so as to be slidable inside the through passage 110 A spool 200 and a plug 300 which is fastened to one end of the through hole 110 and shields one side of the through hole 110. The plug 300 is fastened to the other end of the through hole 110, And the plug 300 is provided between the spool 200 and the plug 300 so that the spool 200 and the plug 300 are separated from each other by elasticity A supply passage 600 which is formed in the valve housing 100 so that one end thereof communicates with the through passage 110 and guides the main pressure to be supplied to the through passage 110; And is formed inside the housing 100 and filled with a fluid having atmospheric pressure therein And a guide passage 620 formed at the inside of the valve housing 100 to guide the fluid supplied through the atmospheric passage 610 to be supplied to the second-speed piston passage 630 ≪ / RTI >
The plug (300)
Wherein the hydraulic motor is installed in the through passage to support one end of the elastic member and the mounting position in the through passage is adjustable from the outside of the valve housing. Automatic speed change device for. delete The connector according to claim 1, wherein the plug (300)
A guide 310 inserted into the through passage 110 and supporting one end of the elastic member 500;
A cap 320 coupled to the valve housing 100 and coupled to one end of the guide 310;
A guide seal 330 and a cap seal 340 which are respectively provided in the guide 310 and the cap 320 to block the fluid in the through flow path 110 from leaking to the outside; Includes automatic speed switching device for hydraulic motors. 4. The spool (200) according to claim 1 or 3, wherein the spool (200)
A central passage 210 formed at one end of the central portion and guiding the fluid in the through passage 110 to pass therethrough;
A drain hole 212 and an orifice hole 214 for guiding the fluid passing through the center channel 210 to be discharged to the outer surface;
A flow path groove 220 formed to be recessed inwardly from the outer circumferential surface to form a space filled with the fluid passing through the supply path 600;
And a moving groove (230) formed to be recessed inwardly from the outer circumferential surface and guiding the fluid introduced through the atmospheric flow passage (610) to be moved to the guide passage (620) Switching device. The left channel 222 and the right channel 224 are formed on the left and right sides of the channel groove 220 and the outer diameters of the left channel 222 and the right channel 224 are different from each other. And a speed change device for a hydraulic motor.
KR1020150053135A 2015-04-15 2015-04-15 The automatic velocity switching device for hydraulic motor KR101667539B1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002054552A (en) * 2000-08-11 2002-02-20 Kawasaki Heavy Ind Ltd Variable displacement hydraulic motor
JP2002138947A (en) * 2000-10-31 2002-05-17 Shimadzu Corp Variable piston pump or motor
KR101058418B1 (en) 2011-05-13 2011-08-24 한국기계연구원 Variable device of swash plate type hydraulic piston motor for track drive unit of the excavator

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002054552A (en) * 2000-08-11 2002-02-20 Kawasaki Heavy Ind Ltd Variable displacement hydraulic motor
JP2002138947A (en) * 2000-10-31 2002-05-17 Shimadzu Corp Variable piston pump or motor
KR101058418B1 (en) 2011-05-13 2011-08-24 한국기계연구원 Variable device of swash plate type hydraulic piston motor for track drive unit of the excavator

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