Blade type hydraulic motor capable of avoiding eccentric wear

Abstract

The invention discloses a vane type hydraulic motor capable of avoiding eccentric wear. The vane type hydraulic motor comprises a shell, a stator, a rotor shaft, a front side cover, a rear side cover, a front flange and a rear flange, a first shell hole penetrating through the shell in the radial direction is communicated with a first stator hole penetrating through the stator in the radial direction, and is communicated with a front annular groove of the front flange after being communicated with a front radial small hole and a front axial small hole of the front side cover through a front annular containing cavity. A radially-through second shell hole of the shell is communicated with a radially-through second stator hole of the stator, and is communicated with a rear annular groove of the rear flange after being communicated with a rear radial small hole and a rear axial small hole of the rear side cover through a rear annular accommodating cavity; a front fit clearance is arranged between the front flange and the end face of the front side cover, a rear fit clearance is arranged between the rear flange and the end face of the rear side cover, the front fit clearance is communicated with the front motor oil drainage hole, and the rear fit clearance is communicated with the rear motor oil drainage hole. Therefore, eccentric wear between the side cover and the flange caused by external force can be avoided.

Description

Technical Field

[0001] The invention relates to a hydraulic motor, belonging to the technical field of hydraulic components, and in particular to a vane type hydraulic motor capable of avoiding eccentric wear. Background Art

[0002] Vane hydraulic motors have the advantages of large output torque, large power-to-volume ratio, compact structure, and stable output, so they are widely used in ship deck machinery. When the vane hydraulic motor is working, the oil will leak through the fitting clearance between the side cover and the flange. In order to improve the power performance and working efficiency of the motor, the fitting clearance between the rotor, side cover, and flange will be reduced to improve the volumetric efficiency and reduce leakage; when the rotor is fixedly connected to the side cover, the volumetric efficiency is improved by reducing the fitting clearance between the side cover and the flange, which will make the fitting clearance between the side cover and the flange smaller, thereby increasing the friction and wear between the side cover and the flange; when the motor is working, under the action of external forces and other factors, the side cover is tightly attached to the flange on one side, resulting in eccentric wear between the side cover and the flange on that side, thereby affecting the working performance and life of the motor.

[0003] The Chinese patent application with application number 201620315012.8 and application date April 15, 2016 discloses a hydraulic motor, including a middle body composed of a stator and a rotor arranged on the inner ring of the stator, and an upper cover plate and a lower cover plate for oil seal, and a rotating shaft is arranged to pass through the upper cover plate, the rotor and the lower cover plate in sequence, wherein at least one path is arranged between the inner ring of the stator and the outer ring of the rotor as a hydraulic oil path for oil inlet and oil drain; a plurality of radial opening grooves are opened radially on the rotor, and blades that are connected and retracted by springs and perform sliding rotation are arranged in the radial opening grooves; each hydraulic oil path is divided into an oil pressure area and an oil drain area by the oil inlet and oil drain ports on the hydraulic oil path in combination with the sliding and rotating blades, and the alternating movement of oil pressure and oil drain drives the rotating shaft to rotate continuously. Although the patent can achieve the purpose of generating huge torque, it still has the following defects: This design cannot avoid eccentric wear between the side cover and the flange due to external force.

[0004] The information disclosed in this background technology section is only intended to increase the understanding of the overall background of this patent application, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to ordinary technicians in this field. Summary of the invention

[0005] The purpose of the present invention is to overcome the defects and problems existing in the prior art that the eccentric wear between the side cover and the flange caused by external force cannot be avoided, and to provide a vane hydraulic motor that can avoid the eccentric wear between the side cover and the flange caused by external force.

[0006] To achieve the above objectives, the technical solution of the present invention is: a vane hydraulic motor for avoiding eccentric wear, the vane hydraulic motor comprising a housing, a stator, a rotor shaft, a front side cover, a rear side cover, a front flange, and a rear flange; The shell is provided with a first shell hole and a second shell hole which are radially connected, and a first damper and a second damper are respectively provided at the inlet ends of the first shell hole and the second shell hole; The two side end surfaces of the stator are respectively provided with a first stator inner hole and a second stator inner hole, and the center of the stator is provided with a stator through hole; the circumference of the first stator inner hole and the second stator inner hole is respectively provided with a first stator hole and a second stator hole which penetrate radially; The front side cover comprises a first front end face and a second front end face, a front central through hole is arranged at the center of the front side cover, a front radial small hole is arranged on the outer circle of the front side cover, and a front axial small hole is arranged in the axial direction of the front side cover which is interpenetrating with the front radial small hole; The rear side cover comprises a first rear end face and a second rear end face, a rear central through hole is arranged at the center of the rear side cover, a rear radial small hole is arranged on the outer circle of the rear side cover, and a rear axial small hole is arranged in the axial direction of the rear side cover and is mutually interpenetrating with the rear radial small hole; A front annular groove is provided on one end surface of the front flange, a front flange center hole is provided in the middle of the front flange, and a front motor oil drain hole is provided in the radial direction of the front flange; A rear annular groove is provided on one end surface of the rear flange, a rear flange center hole is provided in the middle of the rear flange, and a rear motor oil drain hole is provided in the radial direction of the rear flange; The stator is installed in the shell, and the rotor shaft is installed in the stator through hole; the front side cover and the rear side cover are respectively located in the first stator inner hole and the second stator inner hole and are fixedly connected to the rotor shaft, and the front flange and the rear flange are respectively fixedly connected to the two ends of the shell; a front annular cavity is provided between the front side cover, the stator and the front flange, and a rear annular cavity is provided between the rear side cover, the stator and the rear flange; the first shell hole is connected to the first stator hole, the front axial small hole is located in the front annular groove, and the front annular cavity is divided into The rear axial small hole is located in the rear annular groove, and the rear annular cavity is respectively connected with the second stator hole and the rear radial small hole; the front flange center hole is connected with the front center through hole and then connected with the front motor oil drain hole, and the rear flange center hole is connected with the rear motor oil drain hole after being connected with the rear center through hole; a front fitting clearance is provided between the front flange and the end face of the front side cover, and a rear fitting clearance is provided between the rear flange and the end face of the rear side cover.

[0007] The front side cover and the rear side cover have the same structure and size; One end of the front side cover close to the front flange is a second front end face, the other end of the front side cover is a first front end face, and the front axial small hole is arranged on the circumference of the second front end face; One end of the rear side cover close to the rear flange is the second rear end face, the other end of the rear side cover is the first rear end face, and the rear axial small hole is arranged on the circumference of the second rear end face.

[0008] The rotor shaft passes through the rear flange center hole, the rear center through hole, the stator through hole, the front center through hole, and the front flange center hole; The side of the rotor shaft close to the first front end face is the rotor shaft front end face, and the side of the rotor shaft close to the first rear end face is the rotor shaft rear end face; The first front end face is fitted with the front end face of the rotor shaft and fixedly connected with the rotor shaft by bolts; The first rear end face is fitted with the rear end face of the rotor shaft and is fixedly connected to the rotor shaft by bolts.

[0009] The front flange comprises a first front flange end face, a second front flange end face, and a front stop circle, the front annular groove is located on the second front flange end face, and the front stop circle is fitted with the inner hole of the first stator; The rear flange comprises a first rear flange end face, a second rear flange end face, and a rear stop circle, the rear annular groove is located on the second rear flange end face, and the rear stop circle is fitted with the inner hole of the second stator; The first front flange end surface and the first rear flange end surface are respectively fitted to the two side end surfaces of the shell and fixedly connected by bolts.

[0010] The depth of the first stator inner hole is greater than the sum of the height of the front stop circle and the thickness of the front side cover; The depth of the second stator inner hole is greater than the sum of the height of the rear stop circle and the thickness of the rear side cover.

[0011] The second front end face is fitted with the second front flange end face in a small clearance, and the front fitting clearance is located between the second front flange end face and the second front end face; The second rear end face is matched with the second rear flange end face with a small gap, and the rear matching gap is located between the second rear flange end face and the second rear end face.

[0012] The inner side of the first stator inner hole is the first stator end face, and the inner side of the second stator inner hole is the second stator end face; The outer diameter of the front side cover is 1-3 mm smaller than the diameter of the inner hole of the first stator, and the front annular cavity is located between the outer cylindrical surface of the front side cover and the cylindrical surface of the inner hole of the first stator, the end surface of the first stator and the end surface of the second front flange; The outer diameter of the rear cover is 1-3 mm smaller than the diameter of the second stator inner hole, and the rear annular cavity is located between the outer cylindrical surface of the rear cover and the cylindrical surface of the second stator inner hole, the second stator end surface and the second rear flange end surface.

[0013] The front flange center hole is connected to the front motor oil drain hole through the front oil drain channel; The rear flange center hole is communicated with the rear motor oil drain hole through the rear oil drain channel.

[0014] The outer circle of the stator is interference-fitted with the inner hole of the shell.

[0015] The stator through hole is in a closed loop and has six large arc surfaces and six small arc surfaces distributed in sequence and at intervals, and the large arc surfaces and the small arc surfaces are connected by a transition section.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. A vane-type hydraulic motor for avoiding eccentric wear, wherein the front side cover and the rear side cover are respectively fixedly connected to the rotor shaft, the first housing hole is connected to the first stator hole, the front axial small hole is located in the front annular groove, the front annular cavity is respectively connected to the first stator hole and the front radial small hole, the second housing hole is connected to the second stator hole, the rear axial small hole is located in the rear annular groove, the rear annular cavity is respectively connected to the second stator hole and the rear radial small hole, the front flange center hole and the rear flange center hole are connected to the front center through hole and the rear center through hole and are connected to the front motor The oil drain hole and the rear motor oil drain hole are connected, a front fitting clearance is set between the front flange and the end face of the front side cover, and a rear fitting clearance is set between the rear flange and the end face of the rear side cover; when used, the high-pressure oil passes through the first shell hole, the first stator hole, the front annular cavity, the front radial small hole, the front axial small hole in sequence and then enters the front annular groove, and then the high-pressure oil enters the front motor oil drain hole through the front fitting clearance, and at the same time, the high-pressure oil passes through the second shell hole, the second stator hole, the rear annular cavity, the rear radial small hole, the rear axial small hole in sequence and then enters the rear annular groove , then the high-pressure oil enters the rear motor oil drain hole through the rear fitting clearance. When the rotor shaft is in the middle position, the pressure in the front annular groove and the front fitting clearance is the same as the pressure in the rear annular groove and the rear fitting clearance. The axial forces acting on the rotor shaft are equal in magnitude and opposite in direction, and the rotor shaft is in a balanced state. When the rotor shaft deviates to one side under the action of external force, the fitting clearance on that side becomes smaller and the fitting clearance on the opposite side becomes larger, thereby reducing the pressure loss of the high-pressure oil flow on that side and increasing the pressure loss on the opposite side, thereby reducing the pressure in the annular groove and the fitting clearance on the opposite side, and increasing the pressure in the annular groove and the fitting clearance on that side, pushing the rotor shaft to move to the opposite side, reducing the fitting clearance on the opposite side and increasing the fitting clearance on that side, until the axial forces acting on the rotor shaft are equal in magnitude and opposite in direction, the rotor shaft reaches a new balance, and the rotor shaft is in the middle position. At this time, the front side cover and the rear side cover fixedly connected to the two ends of the rotor shaft are also in the middle position, avoiding direct contact between the front side cover and the front flange and the rear side cover and the rear flange, thereby avoiding eccentric wear between the side cover and the flange. Therefore, the present invention can not only avoid eccentric wear between the side cover and the flange caused by external force, but also can automatically adjust.

[0017] 2. In a vane hydraulic motor that avoids eccentric wear, the first front end face is fitted with the front end face of the rotor shaft and fixedly connected to the rotor shaft by bolts, and the first rear end face is fitted with the rear end face of the rotor shaft and fixedly connected to the rotor shaft by bolts; when used, the two side end faces of the rotor shaft are respectively fitted with the end faces of the front side cover and the rear side cover and then fixedly connected, so that the rotor shaft is fixed to the front side cover and the rear side cover respectively, which helps to ensure the stability and precise alignment of the rotor shaft, reduce the friction and energy loss caused by the relative movement between the rotor shaft and the side cover, and thus improve the efficiency and load capacity of the motor. Therefore, the present invention can not only avoid eccentric wear between the side cover and the flange caused by external force, but also improve the efficiency and load capacity of the motor.

[0018] 3. In a vane hydraulic motor for avoiding eccentric wear, a second front end face is matched with a second front flange end face with a small clearance, a front matching clearance is located between the second front flange end face and the second front end face, a second rear end face is matched with a second rear flange end face with a small clearance, and a rear matching clearance is located between the second rear flange end face and the second rear end face; when used, when the rotor shaft deflects toward the second rear flange end face under the action of an external force, the rear matching clearance is reduced and the front matching clearance is increased, thereby increasing the flow rate through the front matching clearance and the pressure loss, thereby reducing the pressure in the front annular groove and the front matching clearance, and reducing the axial force acting on the rotor shaft on this side. At the same time, the flow rate through the rear matching clearance is reduced and the pressure loss is reduced, thereby increasing the pressure in the rear annular groove and the rear matching clearance, and increasing the axial force acting on the rotor shaft on this side. The rotor shaft moves toward the second front flange end face under the action of the combined force, reducing the front matching clearance and increasing the rear matching clearance until a new balance is reached. When the rotor shaft deflects toward the second rear flange end face under the action of an external force, the same applies, thereby avoiding eccentric wear between the side cover and the flange, and improving the reliability and life of the motor. Therefore, the present invention can not only improve the efficiency and load capacity of the motor, but also improve the reliability and service life of the motor.

[0019] 4. In a vane hydraulic motor that avoids eccentric wear, the front annular groove is located on the second front flange end face, and the rear annular groove is located on the second rear flange end face; when in use, high-pressure oil enters the front annular groove and the rear annular groove and generates pressure on the front annular groove and the rear annular groove. When the rotor shaft deviates to one side, the axial force acting on the rotor shaft is adjusted by automatically and dynamically adjusting the high-pressure oil pressure in the front annular groove and the rear annular groove, so that the rotor shaft is in a neutral position and wear is reduced. At the same time, the front annular groove and the rear annular groove help to form a uniform pressure distribution on both sides of the rotor shaft, which can offset the axial force, thereby improving the axial load-bearing capacity of the motor. Therefore, the present invention can not only improve the reliability and service life of the motor, but also improve the axial load-bearing capacity of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the cross-sectional structure of the present invention.

[0021] Figure 2 The present invention Figure 1 Detailed drawing of point I in the middle.

[0022] Figure 3 The present invention Figure 1 Detailed drawing of location II in the middle.

[0023] Figure 4 It is a structural schematic diagram of the front flange in the present invention.

[0024] Figure 5 It is a structural schematic diagram of the rear flange in the present invention.

[0025] Figure 6 It is a structural schematic diagram of the stator in the present invention.

[0026] Figure 7 It is a right side view of the stator in the present invention.

[0027] In the figure: housing 1, first housing hole 11, second housing hole 12, front annular cavity 13, rear annular cavity 14, stator 2, first stator hole 21, second stator hole 22, first stator inner hole 23, second stator inner hole 24, first stator end face 25, second stator end face 26, stator through hole 27, large arc surface 271, small arc surface 272, transition section 273, rotor shaft 3, rotor shaft front end face 31, rotor shaft rear end face 32, rotor 33, motor shaft 34, blade 35, front side cover 4, front radial small hole 41, front axial small hole 42, first front end face 43, second front end face 44, front center through hole 46, rear side cover 5, rear radial small hole 51, rear axial small Hole 52, first rear end face 53, second rear end face 54, rear center through hole 56, front flange 6, front annular groove 61, front motor oil drain hole 62, first front flange end face 64, second front flange end face 65, front stop circle 66, front flange center hole 68, front oil drain channel 69, rear flange 7, rear annular groove 71, rear motor oil drain hole 72, first rear flange end face 74, second rear flange end face 75, rear stop circle 76, rear flange center hole 78, rear oil drain channel 79, first damper 8, front bearing 81, front shaft seal bushing 82, front shaft seal 83, second damper 9, rear bearing 91, rear shaft seal bushing 92, rear shaft seal 93, front fitting clearance h1, rear fitting clearance h2. DETAILED DESCRIPTION

[0028] The present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0029] See also Figure 1 — Figure 7 A vane hydraulic motor for avoiding eccentric wear, the vane hydraulic motor comprising a housing 1, a stator 2, a rotor shaft 3, a front side cover 4, a rear side cover 5, a front flange 6, and a rear flange 7; The housing 1 is provided with a first housing hole 11 and a second housing hole 12 which are radially connected, and a first damper 8 and a second damper 9 are respectively provided at the inlet ends of the first housing hole 11 and the second housing hole 12; The two side end surfaces of the stator 2 are respectively provided with a first stator inner hole 23 and a second stator inner hole 24, and the center of the stator 2 is provided with a stator through hole 27; the first stator inner hole 23 and the second stator inner hole 24 are respectively provided with a first stator hole 21 and a second stator hole 22 which penetrate radially on the circumference thereof; The front side cover 4 comprises a first front end face 43 and a second front end face 44. A front central through hole 46 is provided at the center of the front side cover 4. A front radial small hole 41 is provided on the outer circle of the front side cover 4. A front axial small hole 42 which is interpenetrating with the front radial small hole 41 is provided in the axial direction of the front side cover 4. The rear cover 5 comprises a first rear end face 53 and a second rear end face 54. A rear central through hole 56 is provided at the center of the rear cover 5. A rear radial small hole 51 is provided on the outer circle of the rear cover 5. A rear axial small hole 52 is provided in the axial direction of the rear cover 5 and is interpenetrating with the rear radial small hole 51. A front annular groove 61 is formed on one end surface of the front flange 6, a front flange center hole 68 is formed in the middle of the front flange 6, and a front motor oil drain hole 62 is formed in the radial direction of the front flange 6; A rear annular groove 71 is formed on one end surface of the rear flange 7, a rear flange center hole 78 is formed in the middle of the rear flange 7, and a rear motor oil drain hole 72 is formed in the radial direction of the rear flange 7; The stator 2 is installed in the housing 1, and the rotor shaft 3 is installed in the stator through hole 27; the front side cover 4 and the rear side cover 5 are respectively located in the first stator inner hole 23 and the second stator inner hole 24 and are fixedly connected to the rotor shaft 3, and the front flange 6 and the rear flange 7 are respectively fixedly connected to the two ends of the housing 1; a front annular cavity 13 is provided between the front side cover 4, the stator 2 and the front flange 6, and a rear annular cavity 14 is provided between the rear side cover 5, the stator 2 and the rear flange 7; the first housing hole 11 is connected to the first stator hole 21, the front axial small hole 42 is located in the front annular groove 61, and the front annular cavity 13 is respectively It is connected with the first stator hole 21 and the front radial hole 41; the second shell hole 12 is connected with the second stator hole 22, the rear axial hole 52 is located in the rear annular groove 71, and the rear annular cavity 14 is respectively connected with the second stator hole 22 and the rear radial hole 51; the front flange center hole 68 is connected with the front center through hole 46 and then connected with the front motor oil drain hole 62, and the rear flange center hole 78 is connected with the rear center through hole 56 and then connected with the rear motor oil drain hole 72; a front fitting clearance h1 is set between the front flange 6 and the end face of the front side cover 4, and a rear fitting clearance h2 is set between the rear flange 7 and the end face of the rear side cover 5.

[0030] The front cover 4 and the rear cover 5 have the same structure and size; One end of the front side cover 4 close to the front flange 6 is a second front end face 44, the other end of the front side cover 4 is a first front end face 43, and the front axial small hole 42 is arranged on the circumference of the second front end face 44; One end of the rear side cover 5 close to the rear flange 7 is a second rear end face 54 , the other end of the rear side cover 5 is a first rear end face 53 , and the rear axial small hole 52 is arranged on the circumference of the second rear end face 54 .

[0031] The rotor shaft 3 passes through the rear flange center hole 78, the rear center through hole 56, the stator through hole 27, the front center through hole 46, and the front flange center hole 68; The side of the rotor shaft 3 close to the first front end face 43 is the rotor shaft front end face 31, and the side of the rotor shaft 3 close to the first rear end face 53 is the rotor shaft rear end face 32; The first front end face 43 is fitted with the front end face 31 of the rotor shaft and is fixedly connected to the rotor shaft 3 by bolts; The first rear end face 53 is fitted with the rotor shaft rear end face 32 and fixedly connected to the rotor shaft 3 by bolts.

[0032] The front flange 6 includes a first front flange end face 64, a second front flange end face 65, and a front stop circle 66. The front annular groove 61 is located on the second front flange end face 65. The front stop circle 66 is fitted with the first stator inner hole 23. The rear flange 7 includes a first rear flange end face 74, a second rear flange end face 75, and a rear stop circle 76. The rear annular groove 71 is located on the second rear flange end face 75. The rear stop circle 76 is fitted with the second stator inner hole 24. The first front flange end face 64 and the first rear flange end face 74 are respectively fitted to the two side end faces of the housing 1 and fixedly connected by bolts.

[0033] The depth of the first stator inner hole 23 is greater than the sum of the height of the front stop circle 66 and the thickness of the front side cover 4; The depth of the second stator inner hole 24 is greater than the sum of the height of the rear stop circle 76 and the thickness of the rear side cover 5 .

[0034] The second front end face 44 is fitted with the second front flange end face 65 with a small clearance, and the front fitting clearance h1 is located between the second front flange end face 65 and the second front end face 44; The second rear end face 54 is fitted with the second rear flange end face 75 with a small clearance, and the rear fitting clearance h2 is located between the second rear flange end face 75 and the second rear end face 54 .

[0035] The inner side of the first stator inner hole 23 is a first stator end surface 25, and the inner side of the second stator inner hole 24 is a second stator end surface 26; The outer diameter of the front side cover 4 is 1-3 mm smaller than the diameter of the first stator inner hole 23, and the front annular cavity 13 is located between the outer cylindrical surface of the front side cover 4 and the cylindrical surface of the first stator inner hole 23, the first stator end surface 25 and the second front flange end surface 65; The outer diameter of the rear cover 5 is 1-3 mm smaller than the diameter of the second stator inner hole 24 , and the rear annular cavity 14 is located between the outer cylindrical surface of the rear cover 5 and the cylindrical surface of the second stator inner hole 24 , the second stator end face 26 and the second rear flange end face 75 .

[0036] The front flange center hole 68 is connected to the front motor oil drain hole 62 through the front oil drain channel 69; The rear flange center hole 78 is connected to the rear motor oil drain hole 72 through the rear oil drain channel 79 .

[0037] The outer circle of the stator 2 is interference-fitted with the inner hole of the housing 1 .

[0038] The stator through hole 27 is in a closed loop and has six large arc surfaces 271 and six small arc surfaces 272 spaced apart in sequence. The large arc surfaces and the small arc surfaces are connected by a transition section 273 .

[0039] The supplementary description of the present invention is as follows: In the present invention, the stator 2 is preferably a cylinder with a hollow interior.

[0040] In the present invention, the outer circle of the stator 2 is preferably interference-fitted with the inner hole of the housing 1, and the stator 2 is installed by cold-sleeving.

[0041] In the present invention, the rotor shaft 3 is preferably designed as an integral structure, including a rotor 33 and a motor shaft 34 .

[0042] The preferred rotor 33 of the present invention is installed in the stator through hole 27, and the motor shaft 34 on one side passes through the rear flange center hole 78 and the rear center through hole 56, and the motor shaft 34 on the other side passes through the front center through hole 46 and the front flange center hole 68.

[0043] In the present invention, the front cover 4 and the rear cover 5 are preferably both hollow cylinders.

[0044] In the present invention, the number of the first shell hole 11 and the second shell hole 12 are preferably both one, and they are arranged on the upper side of the shell 1 .

[0045] In the present invention, preferably, the number of the first stator hole 21 and the second stator hole 22 are both one, and they are arranged on the upper side of the stator 2 .

[0046] In the present invention, preferably, the number of the front radial small hole 41, the front axial small hole 42, the rear radial small hole 51, and the rear axial small hole 52 are all one.

[0047] In the present invention, the diameter of the front radial hole 41 is preferably larger than the diameter of the first damper 8 , and the diameter of the rear radial hole 51 is preferably larger than the diameter of the second damper 9 .

[0048] In the present invention, the first front end face 43 is preferably fitted with the front end face 31 of the rotor shaft, and is fixedly connected to the rotor part of the rotor shaft 3 by bolts.

[0049] In the present invention, the first rear end face 53 is preferably fitted with the rear end face 32 of the rotor shaft, and fixedly connected with the rotor part of the rotor shaft 3 by bolts.

[0050] In the present invention, the front flange center hole 68 is preferably connected to the front center through hole 46 and connected to the front motor oil drain hole 62 , and the rear flange center hole 78 is preferably connected to the rear center through hole 56 and connected to the rear motor oil drain hole 72 .

[0051] In the present invention, the sizes of the front annular groove 61 and the rear annular groove 71 are preferably designed comprehensively based on the leakage amount, the static pressure support stiffness and other properties.

[0052] In the present invention, the positions of the front axial small hole 42 and the rear axial small hole 52 are preferably determined according to the design of the front annular groove 61 and the rear annular groove 71 .

[0053] The preferred functions of the front annular groove 61 and the rear annular groove 71 of the present invention are to evenly distribute the pressure of the front fit clearance h1 and the rear fit clearance h2 along the circumferential direction, so that the force acting on the rotor shaft 3 is reasonably along the center line direction of the rotor shaft 3.

[0054] In the present invention, the first damping 8 and the second damping 9 are preferably used to control the speed and reduce vibration and impact.

[0055] Embodiment 1: See also Figure 1 — Figure 7A vane hydraulic motor for avoiding eccentric wear, the vane hydraulic motor comprising a housing 1, a stator 2, a rotor shaft 3, a front side cover 4, a rear side cover 5, a front flange 6, and a rear flange 7; the housing 1 is provided with a first housing hole 11 and a second housing hole 12 which are radially penetrated, and a first damper 8 and a second damper 9 are respectively arranged at the inlet ends of the first housing hole 11 and the second housing hole 12; the end faces of both sides of the stator 2 are respectively provided with a first stator inner hole 23 and a second stator inner hole 24, and a stator through hole 27 is arranged at the center of the stator 2; the circumferences of the first stator inner hole 23 and the second stator inner hole 24 are respectively provided with a first stator hole 21 and a second stator hole 22 which are radially penetrated; the front side cover 4 comprises a first front end face 43, The second front end face 44, the center of the front side cover 4 is provided with a front center through hole 46, the outer circle of the front side cover 4 is provided with a front radial small hole 41, and the axial direction of the front side cover 4 is provided with a front axial small hole 42 which is mutually interpenetrating with the front radial small hole 41; the rear side cover 5 includes a first rear end face 53 and a second rear end face 54, the center of the rear side cover 5 is provided with a rear center through hole 56, the outer circle of the rear side cover 5 is provided with a rear radial small hole 51, and the axial direction of the rear side cover 5 is provided with a rear axial small hole 52 which is mutually interpenetrating with the rear radial small hole 51; a front annular groove 61 is provided on one side end face of the front flange 6, a front flange center hole 68 is provided in the middle of the front flange 6, and a front motor oil drain hole 62 is provided in the radial direction of the front flange 6; the rear A rear annular groove 71 is provided on one end surface of the flange 7, a rear flange center hole 78 is provided in the middle of the rear flange 7, and a rear motor oil drain hole 72 is provided in the radial direction of the rear flange 7; the stator 2 is installed in the housing 1, and the rotor shaft 3 is installed in the stator through hole 27; the front side cover 4 and the rear side cover 5 are respectively located in the first stator inner hole 23 and the second stator inner hole 24 and are fixedly connected to the rotor shaft 3, and the front flange 6 and the rear flange 7 are respectively fixedly connected to the two ends of the housing 1; a front annular cavity 13 is provided between the front side cover 4, the stator 2 and the front flange 6, and a rear annular cavity 14 is provided between the rear side cover 5, the stator 2 and the rear flange 7; the first housing hole 11 is connected to the first stator hole 21, The front axial small hole 42 is located in the front annular groove 61, and the front annular cavity 13 is respectively connected with the first stator hole 21 and the front radial small hole 41; the second shell hole 12 is connected with the second stator hole 22, the rear axial small hole 52 is located in the rear annular groove 71, and the rear annular cavity 14 is respectively connected with the second stator hole 22 and the rear radial small hole 51; the front flange center hole 68 is connected with the front center through hole 46 and then connected with the front motor oil drain hole 62, and the rear flange center hole 78 is connected with the rear center through hole 56 and then connected with the rear motor oil drain hole 72; a front fitting clearance h1 is set between the front flange 6 and the end face of the front side cover 4, and a rear fitting clearance h2 is set between the rear flange 7 and the end face of the rear side cover 5.

[0056] When in use, the high-pressure oil enters the first housing hole 11 through the first damper 8 at the inlet of the first housing hole 11, and then enters the front annular cavity 13 through the first stator hole 21, and then enters the front annular groove 61 through the front radial small hole 41 and the front axial small hole 42 and generates pressure on the front annular groove 61, and then the high-pressure oil enters the front motor oil drain hole 62 through the front matching clearance h1 and generates pressure on the front matching clearance h1; at the same time, the high-pressure oil enters the second housing hole 12 through the second damper 9 at the inlet of the second housing hole 12, and then enters the rear annular cavity 14 through the second stator hole 22, and then After passing through the rear radial small hole 51 and the rear axial small hole 52, the oil enters the rear annular groove 71 and generates pressure on the rear annular groove 71. Then, the high-pressure oil enters the rear motor oil drain hole 72 through the rear fitting clearance h2 and generates pressure on the rear fitting clearance h2. When the rotor shaft 3 is in the middle position, the front fitting clearance h1 is equal to the rear fitting clearance h2, and the leakage through the front fitting clearance h1 and the rear fitting clearance h2 is the same. The pressure in the front annular groove 61 and the front fitting clearance h1 is the same as the pressure in the rear annular groove 71 and the rear fitting clearance h2. The axial forces acting on the rotor shaft 3 are equal in magnitude and opposite in direction. On the contrary, the rotor shaft 3 is in a balanced state; when the rotor shaft 3 deviates to one side under the action of external force, such as the rear flange 7, the front fitting clearance h1 increases and the rear fitting clearance h2 decreases, so that the high-pressure oil flow through the front fitting clearance h1 increases, thereby increasing the pressure loss through the first damping 8, causing the pressure in the front annular groove 61 and the front fitting clearance h1 to decrease, and the axial force acting on the rotor shaft 3 on this side decreases. At the same time, the high-pressure oil flow through the rear fitting clearance h2 decreases, thereby reducing the pressure loss through the second damping 9, and the pressure in the rear annular groove 71 and the rear fitting clearance h2 increases, which acts The axial force on the rotor shaft 3 on this side increases, so the rotor shaft 3 moves toward the front flange 6 under the action of the combined force, reducing the front fit clearance h1 and increasing the rear fit clearance h2 until a new balance is reached and the rotor shaft is in the middle position again; when the rotor shaft 3 deviates from the front flange 6 under the action of external force, the same applies; since the two sides of the rotor shaft 3 are fixedly connected to the front side cover 4 and the rear side cover 5 respectively, when the rotor shaft 3 is in the middle position, the eccentric wear caused by the direct contact between the front side cover 4 and the front flange 6, and the rear side cover 5 and the rear flange 7 under the action of external force is avoided, thereby improving the reliability and life of the motor.

[0057] Embodiment 2: The basic content is the same as Example 1, except that: according to the pressure difference flow formula:; wherein, is the flow rate, is the flow coefficient, is the opening area, is the pressure difference, and is the fluid density; the flow through the front fitting gap h1 increases, that is, the flow through the first damper 8 in the first shell hole 11 increases, and the local pressure loss of the first damper 8 increases; at the same time, the flow through the rear fitting gap h2 decreases, that is, the flow through the second damper 9 in the second shell hole 12 decreases, and the local pressure loss of the second damper 9 decreases.

[0058] Embodiment 3: The basic content is the same as that of Embodiment 1, except that: the structures and sizes of the front side cover 4 and the rear side cover 5 are the same; one end of the front side cover 4 close to the front flange 6 is a second front end face 44, the other end of the front side cover 4 is a first front end face 43, and the front axial small hole 42 is arranged on the circumference of the second front end face 44; one end of the rear side cover 5 close to the rear flange 7 is a second rear end face 54, the other end of the rear side cover 5 is a first rear end face 53, and the rear axial small hole 52 is arranged on the circumference of the second rear end face 54; the rotor shaft 3 passes through Through the rear flange center hole 78, the rear center through hole 56, the stator through hole 27, the front center through hole 46, and the front flange center hole 68; the side of the rotor shaft 3 close to the first front end face 43 is the rotor shaft front end face 31, and the side of the rotor shaft 3 close to the first rear end face 53 is the rotor shaft rear end face 32; the first front end face 43 is fitted with the rotor shaft front end face 31 and is fixedly connected to the rotor shaft 3 by bolts; the first rear end face 53 is fitted with the rotor shaft rear end face 32 and is fixedly connected to the rotor shaft 3 by bolts.

[0059] When in use, after the first front end face 43 of the front side cover 4 is tightly fitted with the front end face 31 of the rotor shaft, it is fixedly connected to the rotor shaft 3 by bolts. After the first rear end face 53 of the rear side cover 5 is tightly fitted with the rear end face 32 of the rotor shaft, it is fixedly connected to the rotor shaft 3 by bolts, so that the front side cover 4 and the rear side cover 5 are fixed to the rotor shaft 3. The bolt connection is relatively firm and has good stability, and is convenient for disassembly and maintenance when necessary. At the same time, the design of fixing the rotor shaft 3 to the front side cover 4 and the rear side cover 5 respectively helps to reduce the friction and energy loss caused by the relative movement between the rotor shaft 3 and the front side cover 4 and the rear side cover 5 respectively, thereby improving the efficiency and load capacity of the motor.

[0060] Embodiment 4: The basic content is the same as that of Example 1, except that: the front flange 6 includes a first front flange end face 64, a second front flange end face 65, and a front stop circle 66, the front annular groove 61 is located on the second front flange end face 65, and the front stop circle 66 is fitted with the first stator inner hole 23; the rear flange 7 includes a first rear flange end face 74, a second rear flange end face 75, and a rear stop circle 76, the rear annular groove 71 is located on the second rear flange end face 75, and the rear stop circle 76 is fitted with the second stator inner hole 24; the first front flange end face 64 and the first rear flange end face 74 are respectively fitted with the two side end faces of the shell 1 and fixedly connected by bolts.

[0061] When in use, after the front stop circle 66 is fitted with the first stator inner hole 23 and the first front flange end face 64 is tightly fitted with one side end face of the shell 1, the front flange 6 is fixedly connected to the shell 1 by bolts; after the rear stop circle 76 is fitted with the second stator inner hole 24 and the first rear flange end face 74 is tightly fitted with the other side end face of the shell 1, the rear flange 7 is fixedly connected to the shell 1 by bolts; the front stop circle 66 and the rear stop circle 76 are respectively used for the installation and positioning of the front flange 6 and the rear flange 7 to ensure the coaxiality of the front flange 6 and the rear flange 7 after installation, thereby ensuring the correct positioning of the rotor shaft 3; at the same time, by automatically and dynamically adjusting the high-pressure oil pressure in the front annular groove 61 and the rear annular groove 71, the axial force acting on the rotor shaft 3 is adjusted, so that the rotor shaft 3 is in a balanced state and the eccentric wear is reduced; the front annular groove 61 and the rear annular groove 71 help to form a uniform pressure distribution on both sides of the rotor shaft 3, which can offset the axial force, thereby improving the axial bearing capacity of the motor.

[0062] Embodiment 5: The basic content is the same as that of Example 1, except that: the depth of the first stator inner hole 23 is greater than the sum of the height of the front stop circle 66 and the thickness of the front side cover 4; the depth of the second stator inner hole 24 is greater than the sum of the height of the rear stop circle 76 and the thickness of the rear side cover 5.

[0063] When in use, the first stator inner hole 23 and the second stator inner hole 24 cooperate with the front stop circle 66 and the rear stop circle 76 respectively to accommodate the front side cover 4 and the rear side cover 5 in the first stator inner hole 23 and the second stator inner hole 24; since the depth of the first stator inner hole 23 is greater than the sum of the height of the front stop circle 66 and the thickness of the front side cover 4, and the depth of the second stator inner hole 24 is greater than the sum of the height of the rear stop circle 76 and the thickness of the rear side cover 5, the outer circle of the first stator inner hole 23 and the front side cover 4 forms a front annular cavity 13, and the outer circle of the second stator inner hole 24 and the rear side cover 5 forms a rear annular cavity 14.

[0064] Embodiment 6: The basic content is the same as that of Example 1, except that: the second front end face 44 is fitted with a small clearance with the second front flange end face 65, and the front fitting clearance h1 is located between the second front flange end face 65 and the second front end face 44; the second rear end face 54 is fitted with a small clearance with the second rear flange end face 75, and the rear fitting clearance h2 is located between the second rear flange end face 75 and the second rear end face 54.

[0065] When in use, the high-pressure oil passes through the front annular groove 61 and the rear annular groove 71 and generates pressure on the front annular groove 61 and the rear annular groove 71. The high-pressure oil enters the motor oil drain chamber through the front fit clearance h1 and the rear fit clearance h2 and generates pressure on the front fit clearance h1 and the rear fit clearance h2. The rotor shaft 3 is maintained in the middle position under the action of the oil pressure of the front annular groove 61, the rear annular groove 71 and the front fit clearance h1 and the rear fit clearance h2, so that the front fit clearance h1 and the rear fit clearance h2 are equal, avoiding eccentric wear, thereby improving the reliability and life of the motor.

[0066] Embodiment 7: The basic content is the same as that of Example 1, except that: the inner side of the first stator inner hole 23 is the first stator end face 25, and the inner side of the second stator inner hole 24 is the second stator end face 26; the outer diameter of the front side cover 4 is 1-3 mm smaller than the diameter of the first stator inner hole 23, and the front annular cavity 13 is located between the outer cylindrical surface of the front side cover 4 and the cylindrical surface of the first stator inner hole 23, and the first stator end face 25 and the second front flange end face 65; the outer diameter of the rear side cover 5 is 1-3 mm smaller than the diameter of the second stator inner hole 24, and the rear annular cavity 14 is located between the outer cylindrical surface of the rear side cover 5 and the cylindrical surface of the second stator inner hole 24, and the second stator end face 26 and the second rear flange end face 75.

[0067] When in use, the outer diameter of the front side cover 4 is 1-3mm smaller than the diameter of the first stator inner hole 23, so that an annular gap is formed between the outer circle of the front side cover 4 and the cylindrical surface of the first stator inner hole 23, and the annular gap, the first stator end face 25, and the second front flange end face 65 together form a front annular cavity 13; the outer diameter of the rear side cover 5 is 1-3mm smaller than the diameter of the second stator inner hole 24, so that an annular gap is formed between the outer circle of the rear side cover 5 and the cylindrical surface of the second stator inner hole 24, and the annular gap, the second stator end face 26, and the second rear flange end face 75 together form a rear annular cavity 14; during operation, the front annular cavity 13 and the rear annular cavity 14 respectively guide the high-pressure oil passing through the first stator hole 21 and the second stator hole 22 to the corresponding holes of the front side cover 4 and the rear side cover 5, thereby ensuring the correct flow direction of the high-pressure oil.

[0068] Embodiment 8: The basic contents are the same as those of Example 1, except that: the front flange center hole 68 is interconnected with the front motor oil drain hole 62 through the front oil drain channel 69; the rear flange center hole 78 is interconnected with the rear motor oil drain hole 72 through the rear oil drain channel 79.

[0069] When in use, the front flange center hole 68 is connected with the front motor oil drain hole 62 through the front oil drain channel 69, and the rear flange center hole 78 is connected with the rear motor oil drain hole 72 through the rear oil drain channel 79, which can effectively guide the oil leakage inside the motor and ensure that the oil can be smoothly discharged from the inside of the motor.

[0070] Embodiment 9: The basic content is the same as that of Example 1, except that: the outer circle of the stator 2 is interference fit with the inner hole of the housing 1; the stator through hole 27 is a closed loop with six large arc surfaces 271 and six small arc surfaces 272 distributed in sequence, and the large arc surfaces and the small arc surfaces are connected by a transition section 273.

[0071] When used, the stator through hole 27 is composed of six large arc surfaces, six small arc surfaces, and a transition section connecting the large arc surfaces and the small arc surfaces, so that the cylindrical shape of the stator through hole 27 is the inner curved surface of the motor, which can not only improve the volumetric efficiency and reduce flow leakage, but also improve durability and impact resistance.

[0072] Embodiment 10: The basic content is the same as that of Example 1, except that: the rotor shaft 3 includes a rotor 33 and a motor shaft 34; the rotor 33 is installed in the stator through hole 27, the motor shaft 34 on one side passes through the rear flange center hole 78 and the rear center through hole 56, and the motor shaft 34 on the other side passes through the front center through hole 46 and the front flange center hole 68; the vane hydraulic motor also includes a front bearing 81, a front shaft seal bushing 82, a front shaft seal 83, a rear bearing 91, a rear shaft seal bushing 92, and a rear shaft seal 93; the The front bearing 81 is installed between the outer side of the motor shaft 34 and the front flange center hole 68, the front shaft seal bushing 82 is installed on the outer side of the motor shaft 34, and the front shaft seal 83 is installed between the outer side of the front shaft seal bushing 82 and the front flange center hole 68; the rear bearing 91 is installed between the outer side of the motor shaft 34 and the rear flange center hole 78, the rear shaft seal bushing 92 is installed on the outer side of the motor shaft 34, and the rear shaft seal 93 is installed between the outer side of the rear shaft seal bushing 92 and the rear flange center hole 78.

[0073] When in use, the front bearing 81 and the rear bearing 91 support the rotor shaft 3 , and the front shaft seal bushing 82 cooperates with the front shaft seal 83 , and the rear shaft seal bushing 92 cooperates with the rear shaft seal 93 to prevent the high-pressure oil inside the housing 1 from leaking out.

[0074] The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiment. Any equivalent modifications or changes made by ordinary technicians in this field based on the contents disclosed by the present invention should be included in the protection scope recorded in the claims.

Claims

1. A vane hydraulic motor for avoiding eccentric wear, characterized in that: The vane-type hydraulic motor comprises a housing (1), a stator (2), a rotor shaft (3), a front side cover (4), a rear side cover (5), a front flange (6), and a rear flange (7); The housing (1) is provided with a first housing hole (11) and a second housing hole (12) which are radially connected, and a first damper (8) and a second damper (9) are provided at the inlet ends of the first housing hole (11) and the second housing hole (12), respectively; The two side end surfaces of the stator (2) are respectively provided with a first stator inner hole (23) and a second stator inner hole (24); the center of the stator (2) is provided with a stator through hole (27); the circumferences of the first stator inner hole (23) and the second stator inner hole (24) are respectively provided with a first stator hole (21) and a second stator hole (22) which penetrate radially; The front side cover (4) comprises a first front end face (43) and a second front end face (44); a front central through hole (46) is provided at the center of the front side cover (4); a front radial small hole (41) is provided on the outer circle of the front side cover (4); and a front axial small hole (42) is provided in the axial direction of the front side cover (4) and is interpenetrating with the front radial small hole (41); The rear side cover (5) comprises a first rear end face (53) and a second rear end face (54); a rear central through hole (56) is provided at the center of the rear side cover (5); a rear radial small hole (51) is provided on the outer circle of the rear side cover (5); and a rear axial small hole (52) is provided in the axial direction of the rear side cover (5) and is interpenetrating with the rear radial small hole (51); A front annular groove (61) is formed on one end surface of the front flange (6), a front flange center hole (68) is formed in the middle of the front flange (6), and a front motor oil drain hole (62) is formed in the radial direction of the front flange (6); A rear annular groove (71) is formed on one end surface of the rear flange (7), a rear flange center hole (78) is formed in the middle of the rear flange (7), and a rear motor oil drain hole (72) is formed in the radial direction of the rear flange (7); The stator (2) is installed in the housing (1), and the rotor shaft (3) is installed in the stator through hole (27); the front side cover (4) and the rear side cover (5) are respectively located in the first stator inner hole (23) and the second stator inner hole (24) and are fixedly connected to the rotor shaft (3); the front flange (6) and the rear flange (7) are respectively fixedly connected to the two ends of the housing (1); a front annular cavity (13) is provided between the front side cover (4), the stator (2) and the front flange (6), and a rear annular cavity (14) is provided between the rear side cover (5), the stator (2) and the rear flange (7); the first housing hole (11) is connected to the first stator hole (21), the front axial small hole (42) is located in the front annular groove (61), and the front annular cavity (14) is provided between the front side cover (4), the stator (2) and the rear flange (6). 3) are respectively connected to the first stator hole (21) and the front radial small hole (41); the second housing hole (12) is connected to the second stator hole (22), the rear axial small hole (52) is located in the rear annular groove (71), and the rear annular cavity (14) is respectively connected to the second stator hole (22) and the rear radial small hole (51); the front flange center hole (68) is connected to the front center through hole (46) and then connected to the front motor oil drain hole (62), and the rear flange center hole (78) is connected to the rear center through hole (56) and then connected to the rear motor oil drain hole (72); a front fitting clearance (h1) is provided between the front flange (6) and the end surface of the front side cover (4), and a rear fitting clearance (h2) is provided between the rear flange (7) and the end surface of the rear side cover (5).

2. A vane hydraulic motor for avoiding eccentric wear according to claim 1, characterized in that: The front side cover (4) and the rear side cover (5) have the same structure and size; One end of the front side cover (4) close to the front flange (6) is a second front end surface (44), the other end of the front side cover (4) is a first front end surface (43), and the front axial small hole (42) is arranged on the circumference of the second front end surface (44); One end of the rear side cover (5) close to the rear flange (7) is a second rear end face (54), the other end of the rear side cover (5) is a first rear end face (53), and the rear axial small hole (52) is arranged on the circumference of the second rear end face (54).

3. A vane hydraulic motor for avoiding eccentric wear according to claim 2, characterized in that: The rotor shaft (3) passes through the rear flange center hole (78), the rear center through hole (56), the stator through hole (27), the front center through hole (46), and the front flange center hole (68); The side of the rotor shaft (3) close to the first front end face (43) is the rotor shaft front end face (31), and the side of the rotor shaft (3) close to the first rear end face (53) is the rotor shaft rear end face (32); The first front end surface (43) is fitted with the front end surface (31) of the rotor shaft and is fixedly connected to the rotor shaft (3) by means of bolts; The first rear end surface (53) is fitted with the rear end surface (32) of the rotor shaft and is fixedly connected to the rotor shaft (3) via bolts.

4. The vane hydraulic motor for avoiding eccentric wear according to claim 1, characterized in that: The front flange (6) comprises a first front flange end surface (64), a second front flange end surface (65), and a front stop circle (66); the front annular groove (61) is located on the second front flange end surface (65); and the front stop circle (66) is fitted with the first stator inner hole (23); The rear flange (7) comprises a first rear flange end surface (74), a second rear flange end surface (75), and a rear stop circle (76); the rear annular groove (71) is located on the second rear flange end surface (75); and the rear stop circle (76) is fitted with the second stator inner hole (24); The first front flange end surface (64) and the first rear flange end surface (74) are respectively fitted to the two side end surfaces of the shell (1) and fixedly connected by bolts.

5. The vane hydraulic motor for avoiding eccentric wear according to claim 4, characterized in that: The depth of the first stator inner hole (23) is greater than the sum of the height of the front stop circle (66) and the thickness of the front side cover (4); The depth of the second stator inner hole (24) is greater than the sum of the height of the rear stop circle (76) and the thickness of the rear side cover (5).

6. A vane hydraulic motor for avoiding eccentric wear according to claim 5, characterized in that: The second front end face (44) is fitted with the second front flange end face (65) with a small clearance, and the front fitting clearance (h1) is located between the second front flange end face (65) and the second front end face (44); The second rear end face (54) is fitted with the second rear flange end face (75) with a small clearance, and the rear fitting clearance (h2) is located between the second rear flange end face (75) and the second rear end face (54).

7. The vane hydraulic motor for avoiding eccentric wear according to claim 4, characterized in that: The inner side of the first stator inner hole (23) is a first stator end surface (25), and the inner side of the second stator inner hole (24) is a second stator end surface (26); The outer diameter of the front side cover (4) is 1-3 mm smaller than the diameter of the first stator inner hole (23); the front annular cavity (13) is located between the outer cylindrical surface of the front side cover (4) and the cylindrical surface of the first stator inner hole (23), the first stator end surface (25) and the second front flange end surface (65); The outer diameter of the rear cover (5) is 1-3 mm smaller than the diameter of the second stator inner hole (24), and the rear annular cavity (14) is located between the outer cylindrical surface of the rear cover (5) and the cylindrical surface of the second stator inner hole (24), the second stator end surface (26) and the second rear flange end surface (75).

8. The vane hydraulic motor for avoiding eccentric wear according to claim 1, characterized in that: The front flange center hole (68) is connected to the front motor oil drain hole (62) via the front oil drain channel (69); The rear flange center hole (78) is communicated with the rear motor oil drain hole (72) via a rear oil drain channel (79).

9. The vane hydraulic motor for avoiding eccentric wear according to claim 1, characterized in that: The outer circle of the stator (2) is interference-fitted with the inner hole of the housing (1).

10. The vane hydraulic motor for avoiding eccentric wear according to claim 1, characterized in that: The stator through hole (27) is provided with six large arc surfaces (271) and six small arc surfaces (272) distributed in sequence in a closed loop, and the large arc surfaces and the small arc surfaces are connected by a transition section (273).

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