Shaft tail sealing structure of axial plunger hydraulic motor

Abstract

The invention relates to the field of motor shaft tail sealing, in particular to an axial plunger hydraulic motor shaft tail sealing structure which comprises a shell, a sealing cover is placed in the shell, threaded grooves are formed in the sealing cover and the shell, fixing bolts are inserted into the threaded grooves in a threaded mode, a transmission shaft is rotationally arranged in the shell, and a movable ring is rotationally arranged between the transmission shaft and the sealing cover jointly. The outer side of the movable ring extends to form an extension section which is in contact with the inner wall of the movable ring, the inner wall of the movable ring is provided with a matching groove, the outer side of the transmission shaft is provided with an inclined surface matched with the matching groove, and a plurality of sealing rings are combined with a spring force compensation mechanism, so that the high-reliability sealing effect is realized; according to the sealing device, the sealing reliability and redundancy are improved, the sealing device can adapt to high-pressure and high-speed working conditions, meanwhile, through the design of the adjusting gasket and the spring force, accurate control over the contact pressure of the sealing end face is achieved, and abrasion of a sealing assembly is dynamically compensated.

Description

Technical Field

[0001] The present invention relates to the field of motor shaft tail seals, and in particular to a shaft tail seal structure for an axial piston hydraulic motor. Background Art

[0002] The shaft tail seal of the axial piston hydraulic motor usually adopts a combination of mechanical seal and static seal to ensure that the hydraulic oil in the housing cavity does not leak; at present, the shaft tail end face seal of the axial piston hydraulic motor adopts the output shaft end face (dynamic ring) and the static ring assembly to form a mechanical seal, so the shaft tail seal assembly is axially long, occupies a large space volume, and the static ring assembly is not easy to assemble.

[0003] In the prior art, for example, the patent with announcement number CN222526449U discloses an axial piston pump / motor shaft tail structure, including a housing, a drive shaft, a bearing, a bearing outer ring, a retaining ring, a front cover, a sealing ring, an oil seal, a pressure plate and a tightening screw. The inner ring of the bearing and the drive shaft have an interference fit to ensure that the two rotate synchronously. During assembly, the inner ring of the bearing is heated with the help of a bearing heater to facilitate installation; the outer ring of the bearing and the housing adopt a clearance fit, and the front cover is used to limit it, reducing the chance of damage to the bearing or housing due to improper interference fit; the sealing ring between the front cover and the housing prevents oil leakage and impurities from intruding, the oil seal between the front cover and the drive shaft is further sealed, the pressure plate and the tightening screw strengthen the oil seal support, improve the pressure resistance, and reduce oil leakage at the shaft tail.

[0004] However, although this technology has improved some of the original problems, there are still areas that need further optimization:

[0005] 1. The reliability of the above-mentioned sealing structure still has room for improvement. Although sealing rings and oil seals are used, under complex working conditions, such as high temperature, high pressure and vibration, the O-rings are prone to aging and deformation, and the oil seals may also wear out due to long-term extrusion and friction, resulting in a decrease in sealing effect, making it difficult to maintain good sealing performance and increasing the risk of leakage.

[0006] 2. When it is necessary to replace or maintain components such as bearings and oil seals, it is necessary to disassemble multiple components such as the pressure plate, tightening screws, and front cover in sequence. The operation is cumbersome, time-consuming, and labor-intensive, which is not conducive to improving the maintenance efficiency of the equipment and affects the normal operation time of the equipment.

[0007] Therefore, based on the above-stated viewpoint, there is still room for improvement in the existing motor shaft tail sealing structure. Summary of the Invention

[0008] In order to solve the above problems, the present invention provides an axial piston hydraulic motor shaft tail sealing structure, including a housing, a sealing cover placed in the housing, and threaded grooves are opened on the sealing cover and the housing, and a fixing bolt is threadedly inserted in the threaded groove.

[0009] A drive shaft rotates inside the housing, and a dynamic seal ring rotates together with the drive shaft between the seal cover and the drive shaft.

[0010] A section of extension extends outwards from the outer side of the dynamic seal ring and contacts the inner wall of the dynamic seal ring. A mating groove is provided on the inner wall of the dynamic seal ring, and an inclined surface that mates with the mating groove is provided on the outer side of the drive shaft.

[0011] Preferably, a static seal ring assembly is provided between the seal cover, the housing, and the drive shaft. The static seal ring assembly includes an adjusting gasket provided on an extension section that extends from the bottom of the seal cover towards the axis of the dynamic seal ring. A static seal ring with a U-shaped cross-section is placed on the adjusting gasket. The U-shaped opening of the static seal ring faces the inner wall of the seal cover. A first seal ring is provided at the U-shaped inner wall of the static seal ring and contacts the inner wall of the seal cover.

[0012] Preferably, a first annular groove is provided on the inner wall of the dynamic seal ring facing the axis of the drive shaft, and a second seal ring is provided in the first annular groove. The outer side of the second seal ring contacts the first annular groove and the outer side of the drive shaft.

[0013] Preferably, a drive groove is provided at the bottom of the drive shaft, and a spline ring is installed in the drive groove.

[0014] Preferably, a second annular groove is provided on the outer side of the seal cover, and a third seal ring that contacts the inner side of the housing is provided in the second annular groove.

[0015] Preferably, a conical ring extends outwards from the outer side of the drive shaft, and the area between the conical ring and the extension section of the seal cover is a sealing cavity. A fastening component is provided in the sealing cavity.

[0016] Preferably, the fastening component includes a bearing provided at the top of the seal ring and the bottom of the conical ring, and a spring is provided between the extension section of the seal cover and the bearing.

[0017] Preferably, a spring seat is provided between the spring and the bearing.

[0018] Preferably, the fixing bolt is removed from the threaded groove, and a clamping component is installed in the threaded groove. The clamping component includes a main cylinder that slides in the threaded groove. A plurality of sliding grooves are provided in the main cylinder along its axis. One side of the sliding groove penetrates through to the outer side of the main cylinder. A plurality of clamping grooves are provided on the inner diameter of the threaded groove in the housing, and the clamping grooves correspond to the sliding grooves one by one. A clamping block slides in the sliding groove.

[0019] One side of the clamping block extends into the corresponding clamping groove. A structure groove is provided at the bottom of the clamping block. The inner side wall corresponding to the sliding groove extends into the structure groove. A pulling spring is provided between the structure groove and the sliding groove. One side of the main cylinder extends to the bottom of the seal cover and is sleeved with an annular plate whose bottom is tightly attached to the seal cover on the outside.

[0020] Preferably, a main shaft slides in the main cylinder, a plurality of triangular grooves are provided on the outside of the main shaft, and a contact plate in contact with the outside of the main shaft is further provided on the side of the clamping block facing the main shaft.

[0021] An annular groove is provided on the upper end of the main shaft, a return spring is provided between the inner bottom wall of the annular groove and the inner top wall of the thread groove, and a pulling plate is sleeved on the outer side of the main shaft located on the thread groove.

[0022] In summary, this application includes at least one of the following beneficial technical effects:

[0023] 1. The present invention achieves a highly reliable sealing effect by combining multiple sealing rings with a spring force compensation mechanism: the use of multiple sealing rings to form a composite sealing structure effectively improves the reliability and redundancy of the seal, and can adapt to high-pressure and high-speed working conditions. At the same time, by adjusting the gasket and spring force design, precise control of the contact pressure of the sealing end face is achieved, and dynamic compensation for the wear of the sealing component is achieved to ensure long-lasting and stable sealing performance.

[0024] 2. The present invention improves the maintainability and work efficiency of the equipment through a convenient disassembly and assembly design: a clip-on part is used instead of a traditional fixing bolt to achieve rapid disassembly and assembly of the sealing cover, which simplifies the maintenance process, reduces maintenance time, reduces maintenance costs, and improves the maintainability and work efficiency of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be further described below with reference to the accompanying drawings and examples.

[0026] Figure 1 It is a schematic diagram of the main structure of the present invention.

[0027] Figure 2 It is a schematic diagram of the cooperation between the transmission shaft and the dynamic ring of the present invention.

[0028] Figure 3 It is a cross-sectional view of the main body of the present invention.

[0029] Figure 4 It is an exploded view of the present invention.

[0030] Figure 5 It is a planar cross-sectional view of the present invention.

[0031] Figure 6 It is a structural schematic diagram of the fastening assembly of the present invention.

[0032] Figure 7 It is a structural schematic diagram of the clamping member of the present invention.

[0033] Figure 8 It is a cross-sectional view of the clamping member of the present invention.

[0034] Figure 9 This invention Figure 8A magnified view of part of the structure at point A.

[0035] In the figure, 1. housing; 10. sealing cover; 11. fixing bolt; 12. transmission shaft; 13. dynamic ring; 14. matching groove; 15. inclined surface; 2. stationary ring assembly; 20. adjusting gasket; 21. stationary ring; 22. sealing ring 1; 23. annular groove 1; 24. sealing ring 2; 3. driving groove; 30. spline ring; 4. annular groove 2; 40. sealing ring 3; 5. tapered ring; 50. sealing chamber; 51. fastening assembly; 510. bearing; 511. spring; 512. spring seat; 6. clamping part; 60. main cylinder; 61. clamping block; 62. structural groove; 63. pull spring; 64. annular plate; 65. main shaft; 66. triangular groove; 67. contact plate; 68. annular groove; 69. return spring; 610. pull plate. DETAILED DESCRIPTION

[0036] The following combination Figures 1 to 9 The embodiments of the present invention are described in detail.

[0037] The present invention discloses an axial piston hydraulic motor shaft tail seal structure, primarily used in the seal of a hydraulic motor shaft tail. This invention effectively prevents lubricating oil leakage and the intrusion of external contaminants, ensuring the reliable operation of the hydraulic motor under harsh operating conditions and improving the operating efficiency and lifespan of the equipment. Furthermore, this invention utilizes multiple sealing rings and a dynamic force compensation mechanism to achieve dynamic adjustment of sealing performance and wear compensation, extending the service life of the sealing assembly. Furthermore, through convenient assembly and disassembly design, such as the use of snap-on fittings, this design simplifies maintenance processes, reduces maintenance costs, and improves the maintainability and reliability of the equipment.

[0038] Example 1: Reference Figure 1 、 Figure 2 and Figure 3 As shown, it includes a shell 1, a sealing cover 10, a fixing bolt 11, a transmission shaft 12, a dynamic ring 13, a matching groove 14 and a slope 15. The sealing cover 10 is placed in the shell 1, and a threaded groove is opened on the sealing cover 10 and the shell 1, and a fixing bolt 11 is threadedly inserted in the threaded groove.

[0039] The housing 1 is used to be installed at the installation position of the motor shaft tail, and the sealing cover 10 can be installed in the housing 1 by plugging. In the initial state, the sealing cover 10 is movably connected to the housing 1. When the sealing cover 10 is installed, several fixing bolts 11 are inserted into the corresponding threaded grooves to fix the sealing cover 10 in the housing 1, thereby completing the fixation of the sealing cover 10.

[0040] A transmission shaft 12 rotates inside the housing 1 , and a dynamic ring 13 rotates between the transmission shaft 12 and the sealing cover 10 . The dynamic ring 13 can rotate inside the sealing cover 10 to achieve a rotary sealing function.

[0041] An extension section extends from the outer side of the moving ring 13 and contacts the inner wall of the moving ring 13. A mating groove 14 is provided on the inner wall of the moving ring 13, and an inclined surface 15 that mates with the mating groove 14 is provided on the outer side of the transmission shaft 12.

[0042] The transmission shaft 12 can rotate within the housing 1 to transmit power. During the rotation process, the inclined surface 15 on its outer side and the mating groove 14 on the inner wall of the moving ring 13 can drive the moving ring 13 to rotate within the sealing cover 10 to achieve synchronous rotation. One side of the transmission shaft 12 extends into the motor and is used to connect with the drive shaft in the motor as a power input interface. When the drive shaft in the motor rotates, it can drive the transmission shaft 12 to rotate under the support and limit of the bearing 510 to ensure the rotation stability.

[0043] Refer to Figure 3 、 Figure 4 and Figure 5 As shown in

[0044] a static ring assembly 2 is provided between the sealing cover 10, the housing 1, and the transmission shaft 12. Specifically, the static ring assembly 2 includes an adjusting gasket 20, a static ring 21, a first sealing ring 22, a first annular groove 23, and a second sealing ring 24. The adjusting gasket 20 is arranged on the extension section extending from the bottom of the sealing cover 10 towards the axis of the moving ring 13. A static ring 21 with a U-shaped cross-section is placed on the adjusting gasket 20, and the U-shaped opening of the static ring 21 faces the inner wall of the sealing cover 10 to form a sealing cavity 50. A first sealing ring 22 is provided at the U-shaped inner wall of the static ring 21, and the first sealing ring 22 contacts the inner wall of the sealing cover 10 to achieve the static seal between the static ring 21 and the sealing cover 10, and the first sealing ring 22 contacting the inner wall of the sealing cover 10 forms the first line of defense.

[0045] Refer to Figure 3 、 Figure 4 and Figure 5 As shown in

[0046] Reference Figure 3 、 Figure 4 and Figure 5 As shown, it includes an annular groove 2 4 and a sealing ring 3 40. An annular groove 2 4 is provided on the outside of the sealing cover 10. A sealing ring 3 40 is provided in the annular groove 2 4 and contacts the inner side of the shell 1. The annular groove 2 4 is used to install the sealing ring 3 40, and the sealing ring 3 40 is used to achieve static sealing between the shell 1 and the sealing cover 10.

[0047] Reference Figure 6 As shown, a conical tapered ring 5 extends from the outside of the transmission shaft 12, and the area between the tapered ring 5 and the extended section of the sealing cover 10 is a sealing cavity 50, in which a fastening assembly 51 is provided; specifically, the fastening assembly 51 includes a tapered ring 5, a sealing cavity 50, a bearing 510, a spring 511 and a spring seat 512, and the bearing 510 is arranged at the top of the sealing cover 10 and the bottom of the tapered ring 5. The bearing 510 can provide rotational support for the transmission shaft 12 through the tapered ring 5, so that the transmission shaft 12 can rotate smoothly under the support of the bearing 510.

[0048] A spring 511 is provided between the extension section of the sealing cover 10 and the bearing 510 . The spring 511 is used to generate an axial preload force. A spring seat 512 is provided between the spring 511 and the bearing 510 . The spring seat 512 is used to evenly transmit the force of the spring 511 to the bearing 510 .

[0049] This sealing structure achieves a rigid connection between the rotating ring 13 and the transmission shaft 12 through regular polygonal contact, ensuring synchronized power transmission. Spring 511 maintains contact between the end faces of the rotating and static rings 21 to compensate for wear. Adjustable gasket 20 optimizes contact pressure to ensure sealing reliability. Multiple sealing rings create a composite sealing structure that enhances sealing redundancy and achieves reliable sealing between rotating and stationary components, adapting to high-pressure and high-speed operating conditions.

[0050] During assembly, the bearing 510 is pre-installed on the transmission shaft 12 to ensure coaxiality, and the spring seat 512 and the spring 511 are inserted to form a pressure compensation assembly. The dynamic ring 13 is then matched with the transmission shaft 12 through a regular polygonal surface to achieve circumferential positioning; the static ring 21, the sealing ring and the adjustment gasket 20 are installed in the sealing cover 10 in sequence to form the static ring assembly 2, and the transmission shaft 12 assembly is installed into the sealing cover 10 to complete the assembly of the dynamic ring 13, and fixed to the housing 1 by tightening bolts to form an integral structure. Finally, the compression of the spring 511 is adjusted to the design requirements by adjusting the thickness of the gasket 20 to ensure the sealing performance.

[0051] Reference Figure 7 、 Figure 8 and Figure 9As shown, during daily use, since the housing 1 is often removed from the motor, the fixing bolt 11 is then rotated out of the threaded groove, so that the housing 1 and the sealing cover 10 can be separated from each other, which is convenient for maintenance personnel to disassemble or repair internal components. Due to the frequent disassembly, it is easy to cause the fixing bolt 11 and the threaded groove to wear more severely, resulting in insufficient tightening force and a more complicated disassembly process. Therefore, the fixing bolt 11 is replaced and a clamping member 6 is installed in the threaded groove; specifically, the clamping member 6 includes a main cylinder 60, a clamping block 61, a structural groove 62, a pulling spring 63, an annular plate 64, a main shaft 65, a triangular groove 66, a contact plate 67, an annular groove 68, a return spring 69 and a pulling plate 610.

[0052] The main cylinder 60 is slidably disposed in the thread groove. The main cylinder 60 can move up and down in the thread groove, so that the main cylinder 60 can be removed from the thread groove by maintenance personnel.

[0053] Several sliding grooves distributed along the axis are provided in the main cylinder 60, and one side of the sliding groove passes through to the outside of the main cylinder 60. Several clamping grooves are provided on the inner diameter of the threaded groove in the shell 1, and the clamping grooves correspond to the sliding grooves one by one. A clamping block 61 slides in the sliding groove, and the clamping block 61 can slide back and forth in the corresponding sliding groove and the clamping groove, and when one side of the clamping block 61 slides into the clamping groove, the clamping block 61 can limit the main cylinder 60 in the threaded groove through the cooperation of the sliding groove and the clamping groove.

[0054] The locking block 61 is provided with a structural groove 62 at the bottom thereof, and the inner side wall of the corresponding sliding groove extends into the structural groove 62, and the structural groove 62 and the sliding groove bracket are jointly provided with a pulling spring 63. In the initial situation, the pulling spring 63 can drive the locking block 61 to be retracted into the corresponding sliding groove through the cooperation between the sliding groove and the inner wall of the structural groove 62, and not be inserted into the locking groove; one side of the main cylinder 60 extends to the bottom of the sealing cover 10 and is provided with an annular plate 64 on the outside, the bottom of which is tightly attached to the sealing cover 10. When the locking block 61 is driven by external force to insert one side into the locking groove, the pulling spring 63 is in a stretched state at this time. In this process, the cooperation between the locking block 61 and the locking groove, and the contact between the annular plate 64 and the lower end of the sealing sleeve, can make the shell 1 and the sealing sleeve fit together through the main cylinder 60 itself, thereby achieving the limiting and fixing effect of the shell 1 and the sealing sleeve.

[0055] When the main shaft 65 is driven downward by an external force, the triangular groove 66 will correspond to the friction plate 67. At this time, the friction plate 67 is no longer affected by the external force of the main shaft 65, and the corresponding pulling spring 63 will drive the clamping block 61 to no longer be located in the clamping groove, and one side of the friction plate 67 will move into the triangular groove 66. Then, when the main shaft 65 is driven upward by an external force, the friction plate 67 will move out of the corresponding triangular groove 66, so that the clamping block 61 is reinserted into the corresponding clamping groove, limiting the housing 1 and the sealing sleeve.

[0056] An annular groove 68 is provided at the upper end of the main shaft 65, and a return spring 69 is provided between the inner bottom wall of the annular groove 68 and the inner top wall of the thread groove, and a pulling plate 610 is provided on the outer side of the thread groove of the main shaft 65. In the initial situation, the return spring 69 applies tension to the main shaft 65 through the annular groove 68, so that the outer side of the main shaft 65 can always be in contact with the end of the resistance plate 67. When the shell 1 and the sealing sleeve are to be disassembled, the main shaft 65 is pulled down by the pulling plate 610, driving the return spring 69 to stretch, so that the resistance plate 67 is located in the triangular groove 66, and then the clamping block 61 is no longer located in the clamping groove, and then the main cylinder 60 can be moved out of the thread groove, and the shell 1 and the sealing sleeve are no longer fixed.

[0057] While working:

[0058] Step 1: Initial state preparation: Before starting operation, first ensure that the hydraulic motor is in a completely stopped state and all related systems are powered off to ensure safe operation; at the same time, clean the area around the motor shaft tail to ensure that the working environment is clean and tidy, free of oil, impurities and other pollutants that affect the sealing effect.

[0059] The second step is to install the sealing cover 10: first align the sealing cover 10 with the installation position on the housing 1, ensuring that the thread groove on the sealing cover 10 is aligned with the thread groove on the housing 1; then, use the fixing bolts 11 to preliminarily fix the sealing cover 10 on the housing 1.

[0060] The second step is to install the clamping member 6: slide the main cylinder 60 into the threaded groove, ensuring that the sliding groove is aligned with the clamping groove on the housing 1. Then, insert the clamping block 61 into the sliding groove so that it can cooperate with the clamping groove to achieve the initial limit of the main cylinder 60.

[0061] The third step is to install the rotating ring 13 assembly: insert the rotating ring 13 into the transmission shaft 12 so that it accurately mates with the inclined surface 15 on the outside of the transmission shaft 12. Ensure that the rotating ring 13 can rotate synchronously with the transmission shaft 12, and that the matching groove 14 on the inner wall of the rotating ring 13 mates tightly with the inclined surface 15 to ensure the rotating sealing function of the rotating ring 13.

[0062] Step 4: Install the stationary ring assembly 2: Install the adjustment gasket 20 on the bottom of the sealing cover 10, extending toward the axis of the dynamic ring 13. Next, place the stationary ring 21, with its ⌚-shaped cross-section, on the adjustment gasket 20, ensuring that the ⌚-shaped opening of the stationary ring 21 faces the inner wall of the sealing cover 10, forming a sealed chamber 50. Finally, install the sealing ring 12 on the ⌚-shaped inner wall of the stationary ring 21, ensuring close contact with the inner wall of the sealing cover 10, forming the first line of defense.

[0063] Step 5. Install the dynamic ring 13 sealing assembly: Install the sealing ring 24 in the annular groove 1 23 on the inner wall of the dynamic ring 13 facing the axis of the transmission shaft 12, ensuring that its outer side is in close contact with the outer side of the transmission shaft 12 to form a dynamic sealing interface between the dynamic ring 13 and the transmission shaft 12.

[0064] Step 6: Install the sealing assembly of the sealing cover 10: Install the sealing ring 3 40 in the annular groove 2 4 on the outside of the sealing cover 10 to ensure that it is in close contact with the inner side of the housing 1 to achieve static sealing between the housing 1 and the sealing cover 10.

[0065] Step 7: Install the fastening assembly 51: Pre-install the bearing 510 onto the drive shaft 12, ensuring proper alignment. Next, insert the spring seat 512 and spring 511 onto the drive shaft 12 to form the pressure compensation assembly. Adjust the thickness of the gasket 20 and adjust the compression of the spring 511 to the design requirements to ensure proper sealing.

[0066] Step 8: Fix the sealing cover 10: Use the fixing bolts 11 to completely fix the sealing cover 10 and the housing 1 to form an integral structure.

[0067] Step 9: Install the clamping member 6: Insert the main shaft 65 into the main cylinder 60 and install the pull plate 610 on the outside of the main shaft 65. Install a return spring 69 in the annular groove 68 at the upper end of the main shaft 65 to ensure that the main shaft 65 is under tension. Then, the pull plate 610 pulls the main shaft 65 upward, allowing the clamping block 61 to enter the clamping groove. The annular plate 64 then fits against the bottom of the sealing cover 10, securing the housing 1 to the sealing cover 10.

[0068] Step 10: Complete the assembly: At this point, the sealing structure has been fully installed. Check that all parts are in place and ensure that nothing is missing or loose.

[0069] Step 11: Run Test: Start the hydraulic motor and observe whether the sealing structure has any leakage or other abnormalities. Check whether there is any oil leakage in each sealing part to ensure good sealing performance.

[0070] 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 characteristics of the present invention. Therefore, the embodiments should be considered in all respects as exemplary and non-restrictive.

[0071] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method 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 can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. An axial piston hydraulic motor shaft tail seal structure, comprising a housing (1), characterized in that: A sealing cover (10) is placed inside the housing (1), and threaded grooves are provided on the sealing cover (10) and the housing (1), and fixing bolts (11) are threadedly inserted into the threaded grooves; A transmission shaft (12) rotates inside the housing (1), and a moving ring (13) rotates jointly between the transmission shaft (12) and the sealing cover (10); A section of extension extends outwards from the outer side of the moving ring (13) and contacts the inner wall of the moving ring (13), and a mating groove (14) is provided on the inner wall of the moving ring (13), and an inclined surface (15) that mates with the mating groove (14) is provided on the outer side of the transmission shaft (12).

2. The axial piston hydraulic motor shaft tail seal structure according to claim 1, characterized in that: A static ring assembly (2) is provided between the sealing cover (10), the housing (1) and the transmission shaft (12). The static ring assembly (2) includes an adjusting gasket (20) provided on an extension section extending towards the axis of the moving ring (13) at the bottom of the sealing cover (10). A static ring (21) with a U-shaped cross-section is placed on the adjusting gasket (20), and the U-shaped opening of the static ring (21) faces the inner wall of the sealing cover (10). A first sealing ring (22) is provided at the U-shaped inner wall of the static ring (21), and the first sealing ring (22) contacts the inner wall of the sealing cover (10).

3. The shaft tail seal structure of an axial piston hydraulic motor according to claim 1, characterized in that: An annular groove one (23) is provided on the inner wall of the moving ring (13) facing the axis of the transmission shaft (12), and a second sealing ring (24) is provided in the annular groove one (23), and the outer side of the second sealing ring (24) contacts the annular groove one (23) and the outer side of the transmission shaft (12).

4. The axial piston hydraulic motor shaft tail seal structure according to claim 1, characterized in that: A driving groove (3) is provided at the bottom of the transmission shaft (12), and a spline ring (30) is installed in the driving groove (3).

5. The shaft tail seal structure of an axial piston hydraulic motor according to claim 1, characterized in that: An annular groove two (4) is provided on the outer side of the sealing cover (10), and a third sealing ring (40) that contacts the inner side of the housing (1) is provided in the annular groove two (4).

6. The shaft tail seal structure of an axial piston hydraulic motor according to claim 1, characterized in that: A conical ring (5) extends outwards from the outer side of the transmission shaft (12), and the area between the conical ring (5) and the extension section of the sealing cover (10) is a sealing cavity (50), and a fastening component (51) is provided in the sealing cavity (50).

7. The axial piston hydraulic motor shaft tail seal structure according to claim 6, characterized in that: The fastening component (51) includes a bearing (510) provided at the top of the sealing ring and the bottom of the conical ring (5), and a spring (511) is provided between the extension section of the sealing cover (10) and the bearing (510).

8. The shaft tail seal structure of an axial piston hydraulic motor according to claim 7, characterized in that: A spring seat (512) is provided between the spring (511) and the bearing (510).

9. The axial piston hydraulic motor shaft tail seal structure according to claim 1, characterized in that: Remove the fixing bolt (11) from the threaded groove, and a clamping component (6) is installed in the threaded groove. The clamping component (6) includes a main cylinder (60) slidably arranged in the threaded groove. A plurality of sliding grooves are provided in the main cylinder (60) along its axis, one side of the sliding groove penetrates to the outside of the main cylinder (60), and a plurality of clamping grooves are provided on the inner diameter of the threaded groove in the housing (1), and the clamping grooves correspond to the sliding grooves one by one. A clamping block (61) slides in the sliding groove; One side of the clamping block (61) extends into the corresponding clamping groove, a structural groove (62) is provided at the bottom of the clamping block (61), the inner side wall of the corresponding sliding groove extends into the structural groove (62), and the structural groove (62) and the sliding groove bracket are jointly provided with a pulling spring (63), one side of the main tube (60) extends to the bottom of the sealing cover (10) and is provided with an annular plate (64) on the outside, the bottom of which is tightly attached to the sealing cover (10).

10. The shaft tail seal structure of an axial piston hydraulic motor according to claim 9, characterized in that: A main shaft (65) slides in the main cylinder (60), and a plurality of triangular grooves (66) are provided on the outer side of the main shaft (65). A contact plate (67) in contact with the outer side of the main shaft (65) is also provided on the side of the clamping block (61) facing the main shaft (65). An annular groove (68) is provided at the upper end of the main shaft (65), a return spring (69) is provided between the inner bottom wall of the annular groove (68) and the inner top wall of the thread groove, and a pulling plate (610) is sleeved on the outer side of the thread groove of the main shaft (65).

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