Large-torque hydraulic motor

Abstract

The invention relates to the field of hydraulic motors, in particular to a large-torque hydraulic motor. The shell and the cylinder block form a plunger cylinder, a reciprocating plunger is arranged in each plunger cylinder, a circular ball head is arranged in each plunger, and the connecting rod is connected with the eccentric shaft sleeve; three inner notches are formed in the ring face of the plunger, and the plunger sealing ring A, the plunger sealing ring B and the plunger sealing ring C are arranged in the inner notches respectively. An oil channel is arranged in the shell, two transverse grooves are formed in two sides of the surface of the oil distribution shaft and communicated with an oil inlet and outlet pipe through drilling holes in the shaft respectively, and the oil distribution shaft and a motor spindle rotate synchronously, so that the oil inlet transverse groove and the oil outlet transverse groove are always located on two sides of a center connecting line of an eccentric wheel on the shaft and an eccentric shaft sleeve respectively and are aligned with oil distribution holes of a part of oil cylinders respectively. Oil is fed into one part of the oil cylinders, and oil is discharged from the other part of the oil cylinders. Meanwhile, the output torque of the hydraulic motor is improved, the structure is simple, and the torque is large.

Description

Technical Field

[0001] The invention relates to the field of hydraulic motors, and in particular to a high-torque hydraulic motor. Background Art

[0002] With the rapid development of modern industry, efficient and reliable power transmission technology has become particularly important. As a common power transmission device, hydraulic motors have attracted much attention due to their wide application in various mechanical transmissions. However, existing hydraulic motors still have performance problems in some aspects. For example, traditional designs still have limitations such as insufficient torque output, low efficiency, and high noise, which may not meet the needs of modern large-scale mechanical applications.

[0003] The existing connecting rod type radial hydraulic motor adopts the design of connecting rod and plunger to realize the rotation of eccentric shaft. However, in actual situation, there is friction between eccentric shaft, plunger and inner housing of hydraulic motor, which will cause wear of plunger and housing, thus causing internal leakage of oil, causing oil to leak onto eccentric shaft between plunger and housing. Over time, it will cause the oil pressure of high pressure oil to decrease, resulting in insufficient output torque, and also shortening the service life of hydraulic motor.

[0004] Therefore, how to achieve higher efficiency and lower energy consumption in the linkage design is a problem worthy of in-depth study. By improving the structural design and control algorithm of the hydraulic motor, its performance can be effectively improved to meet the demand of modern industry for efficient power. This improvement can not only improve the efficiency of power transmission, but also optimize the overall performance of the system, providing support for the application of industrial automation and large-scale mechanical equipment. Summary of the invention

[0005] The present application provides a high torque hydraulic motor, which adopts the following technical solution: A large torque hydraulic motor, the hydraulic motor includes a shell, an oil passer is arranged on the shell, a connecting plate is fixedly connected between the oil passer and the shell, a cylinder block is arranged on the shell, the shell and the cylinder block are fixedly installed through a cover, and an O-ring is arranged on the inner ring of the cover; the shell and the cylinder block form a plunger cylinder, a reciprocating plunger is arranged in each plunger cylinder, a circular ball head is arranged in the plunger, a connecting rod is arranged on the ball head, and the connecting rod is connected to an eccentric shaft sleeve; a sealing structure is arranged on the outer side of the plunger, and the sealing structure is a multiple design, an inner notch is arranged on the annular surface of the plunger, and the inner notch is arranged with three lines, and the inner notch is respectively provided with a plunger sealing ring A, a plunger sealing ring B and a plunger sealing ring C; a retaining ring is arranged on the contact surface between the plunger and the ball head, and a clamping ring is also arranged on the retaining ring Ring; an eccentric sleeve is arranged inside the hydraulic motor, roller bearings are arranged on both sides of the eccentric sleeve, a main shaft is arranged on the side of the eccentric sleeve, the main shaft is connected to the central shaft in the eccentric sleeve, a variable piston A is arranged in the eccentric sleeve, a spring is arranged between the variable piston A and the main shaft of the eccentric sleeve, and a variable piston B is arranged on the other side of the main shaft of the eccentric sleeve; an oil channel is arranged inside the shell, one end of the oil channel terminal is arranged at the upper end of the plunger, and the other end is connected to the oil distribution shaft, two transverse grooves are opened on both sides of the surface of the oil distribution shaft, which are connected to the oil discharge pipe through the drilled holes in the shaft respectively, and the oil distribution shaft and the motor main shaft rotate synchronously, so that the oil inlet transverse groove and the oil discharge transverse groove are always separated on both sides of the center line of the eccentric wheel on the shaft and the eccentric sleeve, and are respectively aligned with the oil distribution holes of a part of the oil cylinder, so that oil is supplied to a part of the oil cylinder and oil is discharged from another part of the oil cylinder.

[0006] Optionally, bolt holes are provided on the blind cover, and the blind cover is fixed to the housing and the cylinder block by connection with bolts.

[0007] Optionally, a circular notch is provided in the middle of the plunger, and the surface of the plunger is hard chrome plated.

[0008] Optionally, the connecting rod is made of chrome-molybdenum steel material.

[0009] Optionally, an oil distribution shaft ring is provided on the outer surface of the oil distribution shaft, and the oil distribution shaft has a hollow structure.

[0010] Optionally, the high-pressure oil inlet pressure is 16-35MPa, and the low-pressure oil discharge pressure is 0.3-1.5MPa.

[0011] Optionally, the high pressure oil flow rate is 8-15 m / s and the low pressure oil flow rate is 2-5 m / s.

[0012] Compared with the prior art, the beneficial effect of the present invention is that the sealing between the plunger and the housing is achieved by arranging a multiple sealing assembly structure between the plunger wall and the housing, and the multiple sealing assemblies can reduce the friction between the plunger and the housing during the reciprocating movement of the plunger, thereby avoiding the friction loss of the plunger. The device also ensures that the output torque of the hydraulic motor is improved through the sealing assembly, and the structure is relatively simple and the torque is large. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be discussed below. Obviously, the technical solutions described in conjunction with the drawings are only some embodiments of the present invention. For ordinary technicians in this field, other embodiments and their drawings can be obtained based on the embodiments shown in these drawings without paying creative work.

[0014] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0015] Figure 2 It is a cross-sectional view of the present invention.

[0016] Figure 3 It is an enlarged cross-sectional view of the present invention.

[0017] Figure 4 It is an enlarged view of the mounting plate of the present invention.

[0018] Figure 5 It is an enlarged view of the connection between the distribution shaft and the housing of the present invention.

[0019] Figure 6 It is an enlarged view of the connection between the spring and the variable piston A of the present invention.

[0020] In the figure: 1. distribution shaft cover; 2. distribution shaft ring; 3. distribution shaft; 4. oiler; 5. oil channel; 6. connecting plate; 7. housing; 8. cover; 9. plunger; 10. cylinder block; 11. ball head; 12. connecting rod; 13. variable piston A; 14. spring; 15. roller bearing; 16. main shaft; 17. skeleton oil seal; 18. eccentric bushing; 19. variable piston B; 20. oil filling hole; 21. oil drain hole; 22. screw plug; 40. retaining ring; 41. elastic retaining ring; 42. snap ring; 43. O-ring; 44. plunger sealing ring A; 45. plunger sealing ring B; 46. plunger sealing ring C; 47. mounting plate. DETAILED DESCRIPTION

[0021] The following will clearly and completely describe the technical solutions of various embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0023] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] An embodiment of the present invention provides a high-torque hydraulic motor.

[0025] Embodiment: A high torque motor, such as Figure 1-6As shown, the hydraulic motor includes a housing 7, an oil duct 4 is provided on the housing 7, a connecting plate 6 is fixedly connected between the oil duct 4 and the housing 7, the oil duct 4 and the housing 7 are fixedly set as one, a cylinder block 10 is also provided on the housing 7, a cover 8 is fixedly installed between the housing 7 and the cylinder block 10, a bolt hole is provided on the cover 8, and it is fixed to the housing 7 and the cylinder block 10 by connection with bolts, an O-ring 43 is provided on the inner ring of the cover 8, and the O-ring 43 is provided between the housing 7 and the cylinder block 10 to play a sealing role to prevent oil leakage in the plunger cylinder; the housing 7 and the cylinder block 10 form a plunger cylinder, and the device is a 7-cylinder design, and a reciprocating plunger 9 is provided in each plunger cylinder, the middle of the plunger 9 is a circular notch, the surface of the plunger 9 is hard chrome-plated, and a circular ball head 11 is provided in the plunger 9, and the ball head 11 is provided in the circular notch in the plunger 9. 1 is provided with a connecting rod 12, the connecting rod 12 is made of chrome-molybdenum steel, and the connecting rod 12 is connected to the eccentric sleeve 18. A sealing structure is provided on the outer side of the plunger 9, and the sealing structure has multiple designs. An inner notch is provided on the annular surface of the plunger 9, and three inner notches are provided. The inner notches are provided with plunger sealing rings A44, plunger sealing rings B45 and plunger sealing rings C46, ​​respectively. The contact between the three sealing rings and the housing 7 on the two sides and the cylinder block 10 can reduce the friction between the plunger 9 and the two side shells. At the same time, the sealing structure can also prevent the high-pressure oil on the plunger 9 from flowing from the wall of the plunger 9 to the eccentric sleeve 18, thereby causing leakage of the oil circuit; a retaining ring 40 is provided on the contact surface between the plunger 9 and the ball head 11, and a retaining ring 42 is also provided on the retaining ring 40. The setting of the retaining ring 42 allows the ball head 11 to rotate on the plunger 9, and the retaining ring 42 can also prevent the ball head 11 from escaping from the plunger 9. A mounting plate 47 is provided around the main shaft 16 .

[0026] An oil distribution shaft 3 is arranged in the housing 7, and an oil distribution shaft ring 2 is arranged on the outer surface of the oil distribution shaft 3. The shaft type of the oil distribution shaft 3 is a hollow structure, and an annular oil groove is built in. It rotates synchronously with the crankshaft through a coupling. The device is set to have seven axial distribution holes, which are high-pressure oil chambers and low-pressure oil chambers, so as to realize the circulation of high-pressure oil and low-pressure oil. An oil channel 5 is arranged inside the housing 7, and one end of the oil channel 5 is arranged at the upper end of the plunger 9, and the other end is connected to the oil distribution shaft 3. With the rotation of the oil distribution shaft, the high-pressure oil and the low-pressure oil in the hydraulic motor are switched. Two transverse grooves are opened on both sides of the surface of the oil distribution shaft 3, and are connected to the oil discharge pipe through the drilled holes in the shaft. The oil distribution shaft 3 and the motor main shaft rotate synchronously, so that the oil inlet transverse groove and the oil discharge transverse groove are always separated on both sides of the connecting line of the eccentric wheel on the shaft and the eccentric sleeve 18, and are respectively aligned with the oil distribution holes of a part of the oil cylinder, so that oil is fed into a part of the oil cylinder and discharged from another part of the oil cylinder. In each oil inlet cylinder on one side of the centerline between the shaft and the eccentric wheel, the component of the oil pressure thrust received by the piston along the connecting rod direction passes through the center of the eccentric wheel, generating torque in the same direction on the motor shaft, driving the motor to rotate continuously.

[0027] An eccentric sleeve 18 is arranged at the center of the hydraulic motor, and roller bearings 15 are arranged on both sides of the eccentric sleeve 18. The roller bearings 15 play an auxiliary role when the eccentric sleeve 18 rotates. A main shaft 16 is arranged on the side of the eccentric sleeve 18, and power is output outward through the main shaft 16. The main shaft 16 is connected to the central shaft in the eccentric sleeve 18. A variable piston A is arranged in the eccentric sleeve 18. There is a spring 14 between the variable piston A and the main shaft of the eccentric sleeve 18. A variable piston B19 is arranged on the other side of the main shaft of the eccentric sleeve 19. When the eccentric sleeve 19 moves and rotates, the variable piston A compresses the spring 14, and the variable piston B19 deviates to the other side. A skeleton oil seal 17 is arranged at the connection between the cylinder block 10 and the main shaft to play a sealing role.

[0028] An oil filling hole 20 and an oil drain hole 21 are provided on the outer side of the housing 7. The oil filling hole 20 and the oil drain hole 21 are connected to an external oil circuit. The oil filling hole 20 fills oil into the hydraulic motor, and the oil drain hole 21 discharges low-pressure oil.

[0029] Working principle: high-pressure oil is injected into the hydraulic motor through the oil filling hole 20, and the high-pressure oil enters the corresponding plunger 9 through the high-pressure oil chamber in the oil distribution shaft 3, pushing the plunger 9 to move. The movement of the plunger 9 drives the connecting rod 12 connected to the plunger 9 to push the eccentric sleeve 18 to rotate. As the eccentric sleeve 18 rotates, the other connecting rods 12 are driven to move. As the other connecting rods 12 move, the remaining plungers 9 also start to move. The component of the oil pressure thrust on the piston along the connecting rod direction passes through the center of the eccentric wheel, generating a torque in the same direction on the motor shaft, driving the motor to rotate continuously.

[0030] The high-pressure oil inlet pressure is 16-35MPa, and the low-pressure oil discharge pressure is 0.3-1.5MPa; the high-pressure oil flow rate is 8-15 m / s, and the low-pressure oil flow rate is 2-5 m / s.

[0031] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive from any point of view. The scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0032] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A high torque hydraulic motor, characterized in that: The hydraulic motor comprises a housing (7), an oil vent (4) is arranged on the housing (7), a connecting plate (6) is fixedly connected between the oil vent (4) and the housing (7), a cylinder block (10) is arranged on the housing (7), the housing (7) and the cylinder block (10) are fixedly installed via a cover (8), and an O-ring (43) is arranged on the inner ring of the cover (8); the housing (7) and the cylinder block (10) form a plunger cylinder, a reciprocating plunger (9) is arranged in each plunger cylinder, a circular ball head (11) is arranged in the plunger (9), a connecting rod (12) is arranged on the ball head (11), and the connecting rod (12) is connected to an eccentric shaft sleeve (18); A sealing structure is provided on the outer side of the plunger (9), and the sealing structure is a multi-design structure. An inner notch is provided on the annular surface of the plunger (9), and three inner notches are provided. The inner notches are provided with plunger sealing rings A (44), plunger sealing rings B (45) and plunger sealing rings C (46), respectively. A retaining ring (40) is provided on the contact surface between the plunger (9) and the ball head (11), and a retaining ring (42) is also provided on the retaining ring (40). An eccentric shaft sleeve (18) is arranged inside the hydraulic motor, roller bearings (15) are arranged on both sides of the eccentric shaft sleeve (18), a main shaft (16) is arranged on the side of the eccentric shaft sleeve (18), the main shaft (16) is connected to the central shaft in the eccentric shaft sleeve (18), a variable piston A (13) is arranged in the eccentric shaft sleeve (18), a spring (14) is arranged between the variable piston A (13) and the main shaft of the eccentric shaft sleeve (18), and a variable piston B (19) is arranged on the other side of the main shaft of the eccentric shaft sleeve (19); An oil passage (5) is provided inside the housing (7). One end of the oil passage (5) is provided at the upper end of the plunger (9), and the other end is connected to the oil distribution shaft (3). Two transverse grooves are provided on both sides of the surface of the oil distribution shaft (3), and are connected to the oil inlet and outlet pipes through the drilled holes in the shaft respectively. The oil distribution shaft (3) and the motor main shaft rotate synchronously, so that the oil inlet transverse groove and the oil outlet transverse groove are always separated on both sides of the connecting line of the eccentric wheel on the shaft and the eccentric shaft sleeve (18), and are respectively aligned with the oil distribution holes of a part of the oil cylinder, so that oil is supplied to a part of the oil cylinder and oil is discharged from another part of the oil cylinder.

2. A high torque hydraulic motor according to claim 1, characterized in that: The cover (8) is provided with bolt holes and is fixed to the housing (7) and the cylinder block (10) by connection with bolts.

3. A high torque hydraulic motor according to claim 1, characterized in that: The middle of the plunger (9) is a circular notch, and the surface of the plunger (9) is hard chrome plated.

4. A high torque hydraulic motor according to claim 1, characterized in that: The connecting rod (12) is made of chrome-molybdenum steel.

5. A high torque hydraulic motor according to claim 1, characterized in that: An oil distribution shaft ring (2) is arranged on the outer surface of the oil distribution shaft (3), and the oil distribution shaft (3) has a hollow structure.

6. A high torque hydraulic motor according to claim 1, characterized in that: The high-pressure oil inlet pressure is 16-35MPa, and the low-pressure oil discharge pressure is 0.3-1.5MPa.

7. A high torque hydraulic motor according to claim 1, characterized in that: The high-pressure oil flow rate is 8-15 m / s, and the low-pressure oil flow rate is 2-5 m / s.

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