CN209724568U - A kind of hydraulic motor keeping off oily flashboard with stator contraction type - Google Patents

Abstract

The utility model relates to hydraulic system fields, relate generally to hydraulic motor, and in particular to a kind of hydraulic motor that oily flashboard is kept off with stator contraction type.Original state, the oily flashboard of left gear and the oily flashboard of right gear are respectively in Zuo Cang and right storehouse, when oil liquid passes through in the right storehouse that unidirectional fuel feed hole sequentially enters each annular oil cavity respectively from the right oil inlet main line in oil inlet pipe, oil liquid pushes the oily flashboard of right gear open, the oily flashboard of right gear separates annular oil cavity, to can only one-way flow clockwise after so that oil liquid is entered annular oil cavity, avoid counterclockwise flow, oil liquid pushes the pushing block in annular oil cavity to circle round along annular oil cavity and slides, to drive rotor clockwise to rotate, each outage inflow oil-drain pipe is passed sequentially through after one circle of oil liquid convolution to be back to outside motor；When needing rotor to rotate counterclockwise, oil liquid enters left oil inlet main line and achieves that.

Description

A kind of hydraulic motor keeping off oily flashboard with stator contraction type

Technical field

The utility model relates to hydraulic system fields, relate generally to hydraulic motor, and in particular to a kind of band stator contraction type Keep off the hydraulic motor of oily flashboard.

Background technique

Hydraulic motor is a kind of executive component of hydraulic system, and the liquid pressure energy that it provides hydraulic pump is changed into drive The mechanical energy (torque and revolving speed) of output shaft rotation.Liquid is the medium of transmission force and movement, and hydraulic motor is mainly used in note Molding machine tool, ship, hoist engine, engineering machinery, building machinery, coal mine machinery, mining machinery, metallurgical machinery, ship machinery, petroleum Chemical industry, harbour machinery etc..

Present hydraulic motor mainly includes sliding-vane motor and plunger hydraulic motor etc., and wherein sliding-vane motor feature is, Forced area of the vane stress area greatly with rear blade in front of oil inlet, force unbalance make rotor generate torque.Vane type Pressure difference between the output torque of hydraulic motor and the discharge capacity of hydraulic motor and hydraulic motor oil inlet and outlet is related, the disadvantage is that right Oil inlet rear blade generates pressure backward；Plunger hydraulic motor feature is that hydraulic oil acts on the end of piston or plunger On face, piston or plunger is made to do straight reciprocating motion, then by movement conversion mechanism (swash plate, cam, crank etc.), by piston or The convert reciprocating motion of plunger is the circular motion of output shaft, the disadvantage is that structure is complicated.Sliding-vane motor and plunger hydraulic motor Each have their own advantage and disadvantage, motor liquid pressure energy conversioning mechanical energy low efficiency.

Utility model content

Problem to be solved in the utility model is to provide that a kind of structure is simple, be applicable in various equipment, energy conversion efficiency is high The hydraulic motor that oily flashboard is kept off with stator contraction type.

The utility model is achieved through the following technical solutions:

A kind of hydraulic motor keeping off oily flashboard with stator contraction type, including stator, rotor, oil inlet pipe and drain line, The stator and the rotor coaxial heart are coupled, and the stator is circumferentially square on the circumferential side wall that it cooperates the rotor To equipped with n annular oil groove, the annular of n >=2, n sealing of circumferential side wall formation of the n annular oil groove and the rotor is oily Chamber；

At least provided with a flashboard storehouse, the flashboard storehouse is divided into Zuo Cang and You Cang, the left storehouse for each annular oil groove bottom Unidirectional fuel feed hole is equipped with right storehouse inner wall, and correspondence is equipped with the left gear oil lock that can block annular oil cavity in the Zuo Cang and right storehouse Plate and the oily flashboard of right gear；When right storehouse enters oil liquid, the oily flashboard of right gear is pressed into annular oil cavity by oil liquid, and the oily flashboard of left gear keeps closing Closed state, oil liquid unidirectional clockwise flow in annular oil cavity, when left storehouse enters oil liquid, the oily flashboard of left gear is pressed into ring by oil liquid Shape oil pocket, the oily flashboard of right gear are closed, oil liquid unidirectional counterclockwise flow in annular oil cavity；Each annular oil groove side wall is equipped with row Oilhole；

The side wall of the rotor is equipped with several pushing blocks that convolution can be cooperated to slide in each annular oil cavity.

Further, the Zuo Cang and right storehouse bilateral symmetry are distributed, and the oily flashboard of left gear and the oily flashboard of right gear pass through one Root pin shaft is rotatably installed on the Zuo Cang and right storehouse median line, is equipped with and is divided between the pin shaft and flashboard storehouse rear wall Every the demarcation plate of Zuo Cang and right storehouse；It is equipped between the oily flashboard of right gear and right storehouse between the oily flashboard of left gear and left storehouse Tension spring；The outage is located at the position being located in front of the pin shaft in flashboard storehouse.

Further, the quantity of the annular oil groove is 3-6, and the annular oil groove is equal along axis stator direction interval Even distribution, each annular oil groove bottom are equipped with a flashboard storehouse, and the flashboard storehouse in all annular oil grooves is along axis stator Direction aligned fashion；Several described pushing blocks are uniformly distributed along rotor axis direction spiral trend.

Further, the rotor is external, built in stator, and the oil inlet pipe includes being arranged along axis direction described The left oil inlet main line and right oil inlet main line of stator interior, the left oil inlet main line side wall are connected to unidirectional in all left storehouses Fuel feed hole, the right oil inlet main line side wall are connected to the unidirectional fuel feed hole in all right storehouses, the oil inlet position of the oil inlet pipe In the right side of the stator；The drain line is located at the right end of the stator, and the drain line connection is in stator most The oil outlet of the outage of right end, the drain line is located on the right side of the stator.

Further, the rotor is built-in, stator is external, and the oil inlet pipe includes being arranged along axis direction described The left oil inlet main line and right oil inlet main line of stator interior, the left oil inlet main line side wall are connected to unidirectional in all left storehouses Fuel feed hole, the right oil inlet main line side wall are connected to the unidirectional fuel feed hole in all right storehouses, the oil inlet position of the oil inlet pipe In in the side wall surface of the stator；The drain line is located at the left end of the stator, and the drain line connection is in stator The oil outlet of the outage of left end, the drain line is located in the side wall surface of the stator.

The utility model is acquired compared with prior art to be had the beneficial effect that:

1, original state, the oily flashboard of left gear and right gear oil flashboard are respectively in Zuo Cang and right storehouse, when oil liquid is from oil inlet pipe Right oil inlet main line passes through unidirectional fuel feed hole respectively and sequentially enters in the right storehouse of each annular oil cavity in road, and oil liquid pushes right gear oil open Flashboard, the oily flashboard of right gear separate annular oil cavity, thus after so that oil liquid is entered annular oil cavity can only one-way flow clockwise, avoid Counterclockwise flow, oil liquid pushes the pushing block in annular oil cavity to circle round along annular oil cavity and slides, so that rotor clockwise be driven to turn It is dynamic, each outage inflow oil-drain pipe is passed sequentially through after one circle of oil liquid convolution to be back to outside motor；When needing rotor inverse When hour hands rotate, oil liquid enters left oil inlet main line and achieves that；

2, the utility model guarantees oil liquid one-way flow in each annular oil cavity, is not in reverse flow state, mentions significantly High energy conversion efficiency, the utility model structure is simple, long service life；

3, the utility model can infinitely increase hydraulic motor length, and the unlimited annular oil cavity that increases obtains infinitely great turn Square；

4, the construction of the utility model hydraulic motor is special, may be produced that logical mandrel hydraulic motor；

5, the flashboard storehouse aligned fashion of stator and several pushing blocks are uniformly distributed along rotor axis direction spiral trend, when Insufficient by oil liquid thrust when one of pushing block is run at flashboard storehouse, other pushing blocks can be pushed normally, to guarantee rotor just Often rotation；

6, the utility model can built in rotor can also rotor it is external, application and popularizations range is big, wide market.

Detailed description of the invention

Fig. 1 keeps off the hydraulic motor of oily flashboard using outside rotor with stator contraction type to be described in the utility model in embodiment 1

Set the schematic diagram of internal structure of formula；

Fig. 2 is stator schematic perspective view described in the utility model in embodiment 1；

Fig. 3 is rotor schematic perspective view described in the utility model in embodiment 1；

Fig. 4 is the annular oil groove schematic perspective view of stator described in the utility model in embodiment 1；

Fig. 5 is annular oil cavity internal state schematic diagram described in the utility model in embodiment 1；

Fig. 6 is the portion A enlarged diagram in Fig. 5；

Fig. 7 is in the hydraulic motor rotor described in the utility model in embodiment 2 for keeping off oily flashboard with stator contraction type

Set formula schematic diagram of internal structure；

Fig. 8 is stator schematic perspective view described in the utility model in embodiment 2；

Fig. 9 is rotor schematic perspective view described in the utility model in embodiment 2；

Figure 10 is annular oil cavity internal state schematic diagram described in the utility model in embodiment 2；

In figure: 1, stator, 2, rotor, 21, pushing block, 3, oil inlet pipe, 4, drain line, 5, annular oil cavity, 51, Zuo Cang, 52, the oily flashboard of left gear, 53, You Cang, 54, the oily flashboard of right gear, 55, unidirectional fuel feed hole, 56, outage, 57, pin shaft, 58, separation Plate, 59, tension spring, 6, ball, 7, oil sealing, 8, left end cap, 9, right end cap.

Specific embodiment

With reference to the accompanying drawing to the further details of explanation of the utility model.Described embodiment is only the application one Section Example, instead of all the embodiments.Based on embodiments herein, those of ordinary skill in the art are not being made Every other embodiment obtained, shall fall in the protection scope of this application under the premise of creative work.

In the description of the present invention, it should be understood that term " on ", "lower", "left", "right", etc. instructions Orientation or positional relationship is to be based on the orientation or positional relationship shown in the drawings, and is merely for convenience of description the utility model and simplification Description, the utility model describes that the principle that press-down type keeps off oily flashboard is arranged on stator, rather than indication or suggestion is signified Device or element must have a particular orientation, be constructed and operated in a specific orientation, the specific shape for keeping off oily flashboard, ruler It is very little, push mode and be subject to final products, therefore should not be understood as limiting the present invention.

Embodiment 1

A kind of hydraulic motor that oily flashboard is kept off with stator contraction type as shown in figures 1 to 6, including stator 1, rotor 2, oil inlet Pipeline 3, drain line 4, left end cap 8 and right end cap 9, the rotor 2 is external, built in stator 1, and the stator 1 and rotor 2 are coaxial The heart is coupled.The stator 1 is circumferentially machined with 4 annular oil grooves on the circumferential side wall outside it, specifically Process is circumferentially to be cut into the annular oil groove of spill in cylindrical body lateral wall.4 annular oil grooves and institute 5,4 annular oil cavities of annular oil cavity for stating inside circumference wall 4 sealings of formation of rotor 2 are uniform along axis stator direction interval Distribution.Each annular oil groove bottom is at least provided with a flashboard storehouse, in the present embodiment, is arranged one, if setting is multiple It is best to be uniformly distributed effect.The flashboard storehouse is divided into left storehouse 51 and right storehouse 53, and the left storehouse 51 and right storehouse 53 are symmetrically divided Cloth, the left storehouse 51 and 53 inner wall of right storehouse are equipped with unidirectional fuel feed hole 55, and correspondence is equipped with energy in the left storehouse 51 and right storehouse 53 The left gear oil flashboard 52 and the oily flashboard 54 of right gear of annular oil cavity 5 are blocked, the flashboard storehouse in all annular oil grooves is along 1 axis of stator Direction aligned fashion.Specifically, the oily flashboard 52 of left gear and the oily flashboard 54 of right gear are rotatably installed in institute by a pin shaft 57 It states on 53 median line of left storehouse 51 and right storehouse, is equipped between the pin shaft 57 and flashboard storehouse rear wall and separates left storehouse 51 and the right side The demarcation plate 58 in storehouse 53, prevents the oil in left storehouse to be directly entered in right storehouse.It is between the left gear oil flashboard 52 and left storehouse 51 and described It is equipped with tension spring 59 between the oily flashboard 54 of right gear and right storehouse 53, not in the case of by oil liquid pressure, the oily flashboard of left gear and the oily lock of right gear Plate is respectively in Zuo Cang and right storehouse.Each annular oil groove side wall is equipped with outage 56, and the outage 56 is located at flashboard storehouse Adjacent annular oil cavity can be connected to by the interior position positioned at 57 front of pin shaft, outage 56.When right storehouse 53 enters oil liquid, The oily flashboard 54 of right gear overcomes the pulling force of tension spring to open, and is against on the side wall of rotor, and annular oil cavity is separated, at this time left gear oil Flashboard 52 is in close state, oil liquid unidirectional clockwise flow in annular oil cavity 5, passes through outage stream after one circle of oil liquid flowing Out；When left storehouse 51 enters oil liquid, the oily flashboard 52 of left gear is opened, and the oily flashboard 54 of right gear is closed, and oil liquid is unidirectional in annular oil cavity 5 Counterclockwise flow controls oil liquid one-way flow in this way, prevents oil liquid adverse current in annular oil cavity.The rotor 2 Inner sidewall is equipped with 4 pushing blocks 21 that convolution can be cooperated to slide in each annular oil cavity 5.The cross-sectional area and annular oil cavity of pushing block Cross-sectional area it is identical.4 pushing blocks 21 are uniformly distributed along 2 axis direction spiral of rotor trend.Oil liquid is in annular oil cavity in this way Pushing block rotation is inside push, so that rotor be made to rotate.

It advanced optimizes, the oil inlet pipe 3 includes the left oil inlet being arranged in inside the stator 1 along axis direction Main line and right oil inlet main line, the left oil inlet main line side wall is connected to the unidirectional fuel feed hole 55 in all left storehouses 51, described Right oil inlet main line side wall is connected to the unidirectional fuel feed hole 55 in all right storehouses 53, and the oil inlet of the oil inlet pipe 3 is located at described The right side of stator 1 is recycled in this way when needing to rotate forward by the nozzle oil inlet of right oil inlet main line, when needing to invert, is led to Cross the nozzle oil inlet circulation of left oil inlet main line.The drain line 4 is located at the right end of the stator 1, and the drain line 4 connects The logical outage 56 in 1 right end of stator, the oil outlet of the drain line 4 are located on the right side of the stator 1.

The left and right ends of rotor have been bolted to connection left end cap 8 and right end cap 9, and left and right two end cap and stator are left Right both ends pass through two convolution sealings of oil sealing 7 respectively and are cooperatively connected.The left and right ends and rotor left and right ends of stator pass through ball 6 Cooperation rolls connection, can make rotor, stator cooperation stable in this way.

The hydraulic motor specific work process described in the utility model for keeping off oily flashboard with stator contraction type is as follows:

The hydraulic motor is mounted in the equipment of needs, inner stator, when needing outer rotor to rotate forward, oil liquid is fixedly mounted Enter from right oil inlet main line, is sequentially entered in the right storehouse of each annular oil cavity by unidirectional fuel feed hole respectively, oil liquid pushes the right side open Oily flashboard is kept off, the oily flashboard of right gear is against on rotor inner sidewall, annular oil cavity is separated, thus after making oil liquid enter annular oil cavity only Energy one-way flow clockwise avoids counterclockwise flow, and oil liquid pushes the pushing block in annular oil cavity to circle round along annular oil cavity and slides, To driving rotor clockwise to rotate, each outage from left to right successively row of flowing into is passed sequentially through after one circle of oil liquid convolution Oil-piping is back to outside motor.During being somebody's turn to do, when one of pushing block is moved to the position in flashboard storehouse, the oily flashboard of right gear It is forced to close, so that the pushing block be made to run out of steam.But remaining pushing block is normally pushed by oil liquid, so that the pushing block be made to continue Convolution movement.When needing rotor to rotate counterclockwise, achieved that as long as oil liquid is entered left oil inlet main line.

Embodiment 2

A kind of hydraulic motor that oily flashboard is kept off with stator contraction type as is seen in figs 7-10, including stator 1, rotor 2, oil inlet Pipeline 3, drain line 4, left end cap 8 and right end cap 9, the rotor 2 is built-in, stator 1 is external, and the stator 1 and rotor 2 are coaxial The heart is coupled.4 annular oil grooves are circumferentially machined on the circumferential side wall of the stator 1 inside it, specifically Process is circumferentially to be cut into the annular oil groove of spill in circle ring column inner sidewall.4 annular oil grooves with 5,4 annular oil cavities of annular oil cavity that the cylindrical outer side wall of the rotor 2 forms 4 sealings are equal along axis stator direction interval Even distribution.Each annular oil groove bottom is at least provided with a flashboard storehouse, in the present embodiment, is arranged one, if setting is more It is a that be uniformly distributed effect best.The flashboard storehouse is divided into left storehouse 51 and right storehouse 53,53 bilateral symmetry of the left storehouse 51 and right storehouse Distribution, the left storehouse 51 and 53 inner wall of right storehouse are equipped with unidirectional fuel feed hole 55, and correspondence is equipped in the left storehouse 51 and right storehouse 53 The left gear oil flashboard 52 and the oily flashboard 54 of right gear of annular oil cavity 5 can be blocked, the flashboard storehouse in all annular oil grooves is along 1 axis of stator Line direction aligned fashion.Specifically, the oily flashboard 52 of left gear and the oily flashboard 54 of right gear are rotatably installed in by a pin shaft 57 On 53 median line of the left storehouse 51 and right storehouse, it is equipped between the pin shaft 57 and flashboard storehouse rear wall and separates left 51 He of storehouse The demarcation plate 58 in right storehouse 53, prevents the oil in left storehouse to be directly entered in right storehouse.Between the oily flashboard 52 of the left gear and left storehouse 51 and institute It states and is equipped with tension spring 59 between the oily flashboard 54 of right gear and right storehouse 53, not in the case of by oil liquid pressure, the oily flashboard of left gear and right gear oil Flashboard is respectively in Zuo Cang and right storehouse.Each annular oil groove side wall is equipped with outage 56, and the outage 56 is located at flashboard It is located at the position in 57 front of pin shaft in storehouse, adjacent annular oil cavity can be connected to by outage 56.When right storehouse 53 enters oil liquid When, the oily flashboard 54 of right gear overcomes the pulling force of tension spring to open, and is against on the side wall of rotor, and annular oil cavity is separated, left at this time It keeps off oily flashboard 52 to be in close state, oil liquid unidirectional clockwise flow in annular oil cavity 5, passes through oil extraction after one circle of oil liquid flowing Hole outflow；When left storehouse 51 enters oil liquid, the oily flashboard 52 of left gear is opened, and the oily flashboard 54 of right gear is closed, and oil liquid is in annular oil cavity 5 Unidirectional counterclockwise flow controls oil liquid one-way flow in this way, prevents oil liquid adverse current in annular oil cavity.The rotor 2 lateral wall is equipped with 4 pushing blocks 21 that convolution can be cooperated to slide in each annular oil cavity 5.The cross-sectional area and annular of pushing block The cross-sectional area of oil pocket is identical.4 pushing blocks 21 are uniformly distributed along 2 axis direction spiral of rotor trend.Oil liquid is in annular in this way Pushing block rotation is push in oil pocket, so that rotor be made to rotate.

It advanced optimizes, the oil inlet pipe 3 includes the left oil inlet being arranged in inside the stator 1 along axis direction Main line and right oil inlet main line, the left oil inlet main line side wall is connected to the unidirectional fuel feed hole 55 in all left storehouses 51, described Right oil inlet main line side wall is connected to the unidirectional fuel feed hole 55 in all right storehouses 53, and the oil inlet of the oil inlet pipe 3 is located at described In the side wall surface of stator 1；The drain line 4 is located at the left end of the stator 1, and the connection of drain line 4 is in stator 1 most The oil outlet of the outage 56 of left end, the drain line 4 is located in the side wall surface of the stator 1.

The left and right ends of stator have been bolted to connection left end cap 8 and right end cap 9, and left and right two end cap and rotor are left Right both ends pass through two convolution sealings of oil sealing 7 respectively and are cooperatively connected.The left and right ends and rotor left and right ends of stator pass through ball 6 Cooperation rolls connection, can make rotor, stator cooperation stable in this way.

The hydraulic motor specific work process described in the utility model for keeping off oily flashboard with stator contraction type is as follows:

The hydraulic motor is mounted in the equipment of needs, external stator, when needing internal rotor to rotate forward, oil liquid is fixedly mounted Enter from right oil inlet main line, is sequentially entered in the right storehouse of each annular oil cavity by unidirectional fuel feed hole respectively, oil liquid pushes the right side open Oily flashboard is kept off, the oily flashboard of right gear is against on rotor lateral wall, annular oil cavity is separated, thus after making oil liquid enter annular oil cavity only Energy one-way flow clockwise avoids counterclockwise flow, and oil liquid pushes the pushing block in annular oil cavity to circle round along annular oil cavity and slides, To drive rotor clockwise to rotate, oil-drain pipe is flowed by each outage after one circle of oil liquid convolution and is back to horse Up to outside.During being somebody's turn to do, when one of pushing block is moved to the position in flashboard storehouse, the oily flashboard of right gear is forced to close, to make The pushing block runs out of steam.But remaining pushing block is normally pushed by oil liquid, so that the pushing block be made to continue convolution movement.Work as needs When rotor rotates counterclockwise, achieved that as long as oil liquid is entered left oil inlet main line.

Claims (5)

1. a kind of hydraulic motor for keeping off oily flashboard with stator contraction type, including stator (1), rotor (2), oil inlet pipe (3) and row Oil pipe line (4), the stator (1) and rotor (2) is concentric is coupled, which is characterized in that

The stator (1) is circumferentially equipped with n annular oil groove on the circumferential side wall that it cooperates the rotor (2), and n >= 2, the annular oil cavity (5) of the circumferential side wall n sealing of formation of the n annular oil groove and the rotor (2)；

At least provided with a flashboard storehouse, the flashboard storehouse is divided into left storehouse (51) He Youcang (53), described for each annular oil groove bottom Left storehouse (51) He Youcang (53) inner wall is equipped with unidirectional fuel feed hole (55), and correspondence is equipped in left storehouse (51) He Youcang (53) The left gear oil flashboard (52) and the oily flashboard (54) of right gear of annular oil cavity (5) can be blocked；When right storehouse (53) enter oil liquid, right gear oil Flashboard (54) is pressed into annular oil cavity (5) by oil liquid, and the oily flashboard (52) of left gear remains off, and oil liquid is in annular oil cavity (5) Unidirectional clockwise flow, when Dang Zuocang (51) enters oil liquid, the oily flashboard (52) of left gear is pressed into annular oil cavity (5) by oil liquid, right gear Oily flashboard (54) is closed, oil liquid unidirectional counterclockwise flow in annular oil cavity (5)；Each annular oil groove side wall is equipped with outage (56)；

The side wall of the rotor (2) is equipped with several can cooperate the pushing block (21) of convolution sliding in each annular oil cavity (5).

2. the hydraulic motor according to claim 1 for keeping off oily flashboard with stator contraction type, which is characterized in that the left storehouse (51) He Youcang (53) bilateral symmetry is distributed, and the oily flashboard (52) of left gear and the oily flashboard (54) of right gear pass through a pin shaft (57) It is rotatably installed on left storehouse (51) He Youcang (53) the median line, between the pin shaft (57) and flashboard storehouse rear wall Equipped with the demarcation plate (58) for separating left storehouse (51) He Youcang (53)；It is between the oily flashboard (52) and left storehouse (51) of left gear and described Tension spring (59) are equipped between the oily flashboard (54) and right storehouse (53) of right gear；The outage (56) is located in flashboard storehouse positioned at described Position in front of pin shaft (57).

3. the hydraulic motor according to claim 2 for keeping off oily flashboard with stator contraction type, which is characterized in that the annular oil The quantity of slot is 3-6, and the annular oil groove is uniformly distributed along stator (1) axis direction interval, each annular oil groove Bottom is equipped with a flashboard storehouse, and the flashboard storehouse in all annular oil grooves is along stator (1) axis direction aligned fashion；It is described several A pushing block (21) is uniformly distributed along rotor (2) axis direction spiral trend.

4. the hydraulic motor according to claim 3 for keeping off oily flashboard with stator contraction type, which is characterized in that the rotor (2) external, stator (1) is built-in, and the oil inlet pipe (3) includes a left side internal in the stator (1) along axis direction setting Oil inlet main line and right oil inlet main line, the left oil inlet main line side wall are connected to the unidirectional fuel feed hole in all left storehouses (51) (55), the right oil inlet main line side wall is connected to the unidirectional fuel feed hole (55) in all right storehouses (53), the oil inlet pipe (3) Oil inlet is located at the right side of the stator (1)；The drain line (4) is located at the right end of the stator (1), the oil exit pipe Road (4) connection is in the outage of stator (1) right end, and the oil outlet of the drain line (4) is located at the right side of the stator (1) On end face.

5. the hydraulic motor according to claim 3 for keeping off oily flashboard with stator contraction type, which is characterized in that the rotor (2) built-in, stator (1) is external, the oil inlet pipe (3) includes a left side internal in the stator (1) along axis direction setting Oil inlet main line and right oil inlet main line, the left oil inlet main line side wall are connected to the unidirectional fuel feed hole in all left storehouses (51) (55), the right oil inlet main line side wall is connected to the unidirectional fuel feed hole (55) in all right storehouses (53), the oil inlet pipe (3) Oil inlet is located in the side wall surface of the stator (1)；The drain line (4) is located at the left end of the stator (1), the oil extraction Pipeline (4) connection is in the outage of stator (1) left end, and the oil outlet of the drain line (4) is located at the stator (1) In side wall surface.