Piston assembly, differential mechanism and operation machine

Abstract

The utility model relates to the technical field of mechanical transmission, and discloses a piston assembly, a differential mechanism and an operation machine, the piston assembly is suitable for abutting against a spring and is in sliding fit with a cylinder sleeve, and the piston assembly comprises a piston body and a sealing ring. The piston body is suitable for sliding in the axial direction of the cylinder sleeve. The piston body is sleeved with the sealing ring, a first sealing part and a second sealing part are arranged on the outer side wall of the sealing ring, the peripheral face of the first sealing part and the peripheral face of the second sealing part are suitable for being attached to the inner side wall of a cylinder sleeve, the first sealing part and the second sealing part are suitable for being in sliding contact with the inner wall of the cylinder sleeve, and the first sealing part and the second sealing part are arranged in a spaced mode. The sealing performance can be improved, oil stains on the inner wall of the cylinder sleeve can be cleaned, and lubricating oil is prevented from entering the air cylinder.

Description

Technical Field

[0001] This application relates to the technical field of mechanical transmission, and specifically relates to a piston assembly, a differential, and a working machine. Background Art

[0002] As an important control element, pneumatic actuators are widely used in the drive and control of various valves, switches, actuators, and differentials. Among them, the currently widely used pneumatic actuators mostly rely on single-direction sealing rings to isolate the internal and external environments of the cylinder. This design can effectively prevent external media (such as oil products) from infiltrating into the cylinder interior in the initial stage. However, as the usage time prolongs, due to the reciprocating movement of the piston, it is inevitable to bring the oil products in the outer cavity of the cylinder into the cylinder interior. These oil products entering the cylinder will not only affect the working environment inside the cylinder, causing pollution and blockage of key components such as sensors and air pipes, but may also lead to oil leakage, further exacerbating equipment damage and failure rate. Summary of the Invention

[0003] In view of this, this application provides a piston assembly, a differential, and a working machine to solve the problem that oil products in the outer cavity of the cylinder are brought into the cylinder interior, exacerbating equipment damage and failure rate.

[0004] In a first aspect, this application provides a piston assembly, which is adapted to abut against a spring and is slidably fitted with a cylinder liner, and includes a piston body and a sealing ring.

[0005] The piston body is adapted to slide axially along the cylinder liner. The sealing ring is sleeved on the piston body. A first sealing portion and a second sealing portion are provided on the outer sidewall of the sealing ring. The outer peripheral surfaces of the first sealing portion and the second sealing portion are adapted to fit with the inner sidewall of the cylinder liner. The first sealing portion and the second sealing portion are adapted to make sliding contact with the inner wall of the cylinder liner. The first sealing portion and the second sealing portion are spaced apart.

[0006] Beneficial Effects: By designing a bi-directional sealing ring with a first sealing portion and a second sealing portion, not only the sealing performance of the piston during forward movement is ensured, but also the sealing requirements during the backward movement of the piston are taken into account, achieving full-stroke sealing protection and effectively preventing the mutual leakage of lubricating oil and gas. The bi-directional sealing design reduces problems such as oil leakage and air leakage caused by lubricating oil entering the cylinder interior, thereby avoiding damage to components such as sensors and air pipes caused by these problems, and improving stability and reliability.

[0007] In an alternative embodiment, the first sealing portion is close to the first end of the piston body, the second sealing portion is close to the second end of the piston body, the direction from the first end to the second end of the piston body is adapted to coincide with the axial direction of the cylinder liner, the outer peripheral edge of the first sealing portion inclines towards the first end of the piston body, and the outer peripheral edge of the second sealing portion inclines towards the second end of the piston body.

[0008] Beneficial effects: The inclined design of the first sealing portion and the second sealing portion enables the sealing ring to fit more closely to the inner wall of the cylinder liner during the movement of the piston, forming a more effective sealing barrier. This design not only enhances the sealing effect but also reduces the energy loss caused by poor sealing. The inclined sealing portion design helps to reduce the direct contact area between the sealing ring and the cylinder liner, thereby reducing friction and wear and extending the service life of the sealing ring and the cylinder liner.

[0009] In an alternative embodiment, the sealing ring further includes a connecting portion, a sunk groove is provided on the outer peripheral surface of the piston body, the sunk groove is arranged along the circumferential direction of the piston body, the connecting portion is located in the sunk groove, and the connecting portion and the sunk groove are adapted in shape.

[0010] Beneficial effects: By providing a sunk groove on the piston body and embedding the connecting portion of the sealing ring therein, a firm connection between the sealing ring and the piston body is achieved. This connection method not only enhances the anti-detachment ability of the sealing ring but also improves the sealing performance of the sealing ring. The design of the sunk groove simplifies the installation process of the sealing ring, making the installation more convenient and fast, and reducing the installation cost and time.

[0011] In an alternative embodiment, the connecting portion is provided with a bent end, the bent end faces the first end of the piston body, and the bent end bends towards the outer peripheral surface of the piston body.

[0012] Beneficial effects: The connecting portion is designed with a bent end and bends towards the first end of the piston body. This design helps to guide the lubricating oil to the outside of the cylinder liner during the movement of the piston, reducing the risk of the lubricating oil entering the cylinder interior. The design of the bent end also enhances the sealing effect between the sealing ring and the sunk groove, further preventing the mutual leakage of the lubricating oil and gas.

[0013] In an alternative embodiment, the two opposite inner side walls of the sunk groove are respectively a first side wall and a second side wall, the first side wall is close to the first end of the piston body, the second side wall is close to the second end of the piston body, the outer diameter of the first side wall is smaller than the outer diameter of the second side wall, and the bent end abuts against the first side wall.

[0014] Beneficial effects: The design with different outer diameters on both side walls of the sunken groove enables the bent end to abut more closely against the first side wall, thereby enhancing the connection strength between the sealing ring and the piston body. At the same time, it also facilitates the sleeving of the sealing ring on the piston body. This design helps prevent the sealing ring from falling off or shifting under high pressure or high-speed movement. The enhanced connection strength further improves the sealing performance of the sealing ring, ensuring the stable operation of the pneumatic actuator.

[0015] In an alternative embodiment, a groove is provided at the second end of the piston body, and the groove is adapted to receive the spring.

[0016] Beneficial effects: By providing a groove at the second end of the piston body for the spring to be embedded, this design enables the spring to be better positioned and apply a return force to the piston. The function of the return force helps prevent the piston from skewing during movement, thereby reducing the friction and wear between the piston and the cylinder liner. Preventing the piston from skewing not only reduces frictional losses but also improves the transmission efficiency of the system, enabling the pneumatic actuator to work more efficiently.

[0017] In an alternative embodiment, the shape of the bottom of the groove is adapted to match the end of the spring.

[0018] Beneficial effects: The shape of the bottom of the groove is adapted to the end of the spring. This design ensures that the spring can be stably positioned after being embedded in the groove. The stable positioning of the spring helps maintain a constant return force of the spring, thereby improving the stability and reliability of the system. The stable positioning of the spring reduces the phenomenon of the spring loosening or falling off during operation, and thus extends the service life of the spring and the piston.

[0019] In an alternative embodiment, the connecting portion, the first sealing portion, and the second sealing portion are configured as an integral structure.

[0020] Beneficial effects: Configuring the connecting portion, the first sealing portion, and the second sealing portion as an integral structure simplifies the manufacturing process of the sealing ring. This integrated design not only improves production efficiency but also reduces manufacturing costs. The integrated design helps ensure the consistency of the connection strength and sealing performance between components, thereby improving the overall performance of the entire piston assembly.

[0021] In a second aspect, the present application further provides a differential, including a spring, a cylinder liner, and the piston assembly. The piston body of the piston assembly is in sliding contact with the inner side wall of the cylinder liner, and the piston body abuts against the spring.

[0022] In a third aspect, the present application further provides a working machine, including: the differential.

[0023] Since the work machine includes a differential and has the same effect as the differential, it will not be elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0025] Figure 1 Structural schematic diagram of a piston assembly according to an embodiment of the present application;

[0026] Figure 2 Structural schematic diagram of the sealing ring in the embodiment of the present application;

[0027] Figure 3 Structural schematic diagram of a differential according to an embodiment of the present application.

[0028] Description of reference numerals:

[0029] 1. Spring; 2. Cylinder liner; 3. Piston body; 4. Sealing ring; 5. First sealing portion; 6. Second sealing portion; 7. Connecting portion; 8. Bent end; 9. Sunk groove; 10. Groove. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] In order to make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present application.

[0031] The following will describe the embodiments of the present application in conjunction with Figures 1 to 3 , describing the embodiments of the present application.

[0032] According to an embodiment of the present application, on the one hand, a piston assembly is provided, which is adapted to abut against the spring 1 and is slidably engaged with the cylinder liner 2, and includes a piston body 3 and a sealing ring 4.

[0033] The piston body 3 is adapted to slide axially along the cylinder liner 2, and the piston body 3 can move bidirectionally along the axis of the cylinder liner 2. The sealing ring 4 is sleeved on the piston body 3. The first sealing portion 5 and the second sealing portion 6 are provided on the outer side wall of the sealing ring 4. The outer peripheral surfaces of the first sealing portion 5 and the second sealing portion 6 are adapted to fit against the inner side wall of the cylinder liner 2, and the shapes of the first sealing portion 5 and the second sealing portion 6 are adapted to the inner wall of the cylinder liner 2, so as to avoid gaps. The first sealing portion 5 and the second sealing portion 6 are adapted to make sliding contact with the inner wall of the cylinder liner 2. While the first sealing portion 5 and the second sealing portion 6 move bidirectionally following the piston body 3, they can not only achieve a sealing effect, but also scrape off the oil traces on the inner side wall of the cylinder liner 2. The first sealing portion 5 and the second sealing portion 6 are arranged at intervals.

[0034] In this embodiment, by designing the bidirectional sealing ring 4 with the first sealing portion 5 and the second sealing portion 6, not only the sealing performance of the piston during forward movement is ensured, but also the sealing requirements during backward movement of the piston are taken into account, realizing full-stroke sealing protection and effectively preventing the mutual leakage of lubricating oil and gas. The design of bidirectional sealing reduces the problems of oil leakage and air leakage caused by the entry of lubricating oil into the cylinder interior, thereby avoiding the damage to components such as sensors and air pipes caused by these problems and improving stability and reliability.

[0035] In some embodiments, multiple additional sealing portions can be provided, and the multiple sealing portions are arranged on the outer peripheral surface of the sealing ring 4 and are arranged in parallel with the first sealing portion 5 and the second sealing portion 6, which can enhance the sealing and oil trace removal effects.

[0036] In some embodiments, the first sealing portion 5 is close to the first end of the piston body 3, the second sealing portion 6 is close to the second end of the piston body 3, the direction from the first end to the second end of the piston body 3 is adapted to coincide with the axis of the cylinder liner 2, the outer peripheral edge of the first sealing portion 5 inclines towards the first end of the piston body 3, and the outer peripheral edge of the second sealing portion 6 inclines towards the second end of the piston body 3.

[0037] Optionally, an included angle can be formed between the first sealing portion 5 and the second sealing portion 6.

[0038] In this embodiment, the inclined design of the first sealing portion 5 and the second sealing portion 6 enables the sealing ring 4 to fit more closely against the inner wall of the cylinder liner 2 during piston movement, forming a more effective sealing barrier. This design not only enhances the sealing effect, but also reduces the energy loss caused by poor sealing. The inclined sealing portion design helps to reduce the direct contact area between the sealing ring 4 and the cylinder liner 2, thereby reducing friction and wear and extending the service lives of the sealing ring 4 and the cylinder liner 2.

[0039] In some embodiments, the sealing ring 4 further includes a connecting portion 7. A sunk groove 9 is provided on the outer peripheral surface of the piston body 3. The sunk groove 9 is arranged along the circumferential direction of the piston body 3. The connecting portion 7 is located within the sunk groove 9, and the shapes of the connecting portion 7 and the sunk groove 9 are adapted to each other.

[0040] Optionally, the sunk groove 9 is arranged as an annular structure, and a plurality of annular protrusions are provided on the bottom of the sunk groove 9. A plurality of annular grooves adapted thereto are provided on the connecting portion 7 of the sealing ring 4, thereby ensuring the stability and sealing performance of the sealing ring 4.

[0041] In this embodiment, by providing the sunk groove 9 on the piston body 3 and embedding the connecting portion 7 of the sealing ring 4 therein, a firm connection between the sealing ring 4 and the piston body 3 is achieved. This connection method not only enhances the anti-detachment ability of the sealing ring 4 but also improves the sealing performance of the sealing ring 4. The design of the sunk groove 9 simplifies the installation process of the sealing ring 4, making the installation more convenient and fast, and reducing the installation cost and time.

[0042] In some embodiments, the connecting portion 7 is provided with a bent end 8. The bent end 8 faces the first end of the piston body 3, and the bent end 8 bends towards the outer peripheral surface of the piston body 3.

[0043] In this embodiment, the connecting portion 7 is designed with a bent end 8 and bends towards the first end of the piston body 3. This design helps to guide the lubricating oil to the outside of the cylinder liner 2 when the piston moves, reducing the risk of the lubricating oil entering the cylinder interior. The design of the bent end 8 also enhances the sealing effect between the sealing ring 4 and the sunk groove 9, further preventing the mutual leakage of the lubricating oil and gas.

[0044] In some embodiments, the two opposite inner side walls of the sunk groove 9 are respectively a first side wall and a second side wall. The first side wall is close to the first end of the piston body 3, and the second side wall is close to the second end of the piston body 3. The outer diameter of the first side wall is smaller than that of the second side wall, and the bent end 8 abuts against the first side wall. When installing the sealing ring 4, it can be sleeved in from the first end.

[0045] Optionally, the outer diameter of the first side wall can also be larger than that of the second side wall. When installing the sealing ring 4, it can be sleeved in from the second end.

[0046] In this embodiment, the design of the different outer diameters of the two side walls of the sunk groove 9 enables the bent end 8 to abut more closely against the first side wall, thereby enhancing the connection strength between the sealing ring 4 and the piston body 3. At the same time, it also facilitates sleeving the sealing ring 4 on the piston body 3. This design helps to prevent the sealing ring 4 from falling off or shifting under high pressure or high-speed movement. The enhanced connection strength further improves the sealing performance of the sealing ring 4, ensuring the stable operation of the pneumatic actuator.

[0047] In some embodiments, a groove 10 is provided at the second end of the piston body 3, and the groove 10 is adapted to receive the spring 1 therein.

[0048] In this embodiment, by providing the groove 10 at the second end of the piston body 3 for receiving the spring 1, this design enables the spring 1 to be better positioned and apply a return force to the piston. The function of the return force helps to prevent the piston from deflecting during movement, thereby reducing the friction and wear between the piston and the cylinder liner 2. Preventing piston deflection not only reduces friction losses but also improves the transmission efficiency of the system, enabling the pneumatic actuator to work more efficiently.

[0049] In some embodiments, the shape of the bottom of the groove 10 is adapted to match the end of the spring 1.

[0050] In this embodiment, the shape of the bottom of the groove 10 matches the end of the spring 1, and this design ensures that the spring 1 can be stably positioned after being inserted into the groove 10. The stable positioning of the spring 1 helps to keep the return force of the spring 1 constant, thereby improving the stability and reliability of the system. The stable positioning of the spring 1 reduces the phenomenon of the spring 1 loosening or falling off during operation, and thus extends the service life of the spring 1 and the piston.

[0051] In some embodiments, the connecting portion 7, the first sealing portion 5, and the second sealing portion 6 are configured as an integral structure.

[0052] In this embodiment, by configuring the connecting portion 7, the first sealing portion 5, and the second sealing portion 6 as an integral structure, the manufacturing process of the sealing ring 4 is simplified. This integrated design not only improves production efficiency but also reduces manufacturing costs. The integrated design helps to ensure the consistency of the connection strength and sealing performance between components, thereby improving the overall performance of the entire piston assembly.

[0053] According to an embodiment of the present application, on the other hand, a differential is further provided, including a spring 1, a cylinder liner 2, and a piston assembly. The piston body 3 of the piston assembly is in sliding contact with the inner side wall of the cylinder liner 2, and the piston body 3 abuts against the spring 1.

[0054] In this embodiment, by applying the above piston assembly to the differential, the sealing performance and transmission efficiency of the differential can be significantly improved. This helps to reduce the energy loss and failure rate of the differential during operation, and improve the overall performance and reliability of the differential. As an important part of the working machinery, the improvement of the performance of the differential will directly drive the improvement of the performance of the entire working machinery. This will enable the working machinery to maintain stable operation and high-efficiency operation even in more severe working environments.

[0055] According to an embodiment of the present application, on the other hand, a working machinery is further provided, including: a differential.

[0056] In this embodiment, applying the differential including the above piston assembly to construction machinery such as excavators and loaders can significantly improve the performance and reliability of the pneumatic actuators of these machines. This will enable the machines to complete various tasks more efficiently during operation and improve the operation efficiency. Due to the improvement of the performance of the piston assembly and the differential, the failure rate and the number of repairs are reduced, thereby reducing the maintenance cost of the construction machinery.

[0057] Although the embodiments of the present application have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present application, and such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A piston assembly, characterized in that: It is suitable for abutting against the spring (1) and slidingly cooperating with the cylinder sleeve (2), and comprises: A piston body (3) adapted to slide along the axial direction of the cylinder sleeve (2); A sealing ring (4) is sleeved on the piston body (3), and a first sealing portion (5) and a second sealing portion (6) are provided on the outer wall of the sealing ring (4), and the outer peripheral surfaces of the first sealing portion (5) and the second sealing portion (6) are suitable for fitting with the inner wall of the cylinder sleeve (2), and the first sealing portion (5) and the second sealing portion (6) are suitable for sliding contact with the inner wall of the cylinder sleeve (2), and the first sealing portion (5) and the second sealing portion (6) are arranged at intervals.

2. The piston assembly according to claim 1, characterized in that: The first sealing portion (5) is close to the first end of the piston body (3), and the second sealing portion (6) is close to the second end of the piston body (3). The direction from the first end of the piston body (3) to the second end is suitable for axial overlap with the cylinder sleeve (2). The outer peripheral edge of the first sealing portion (5) is inclined toward the first end of the piston body (3), and the outer peripheral edge of the second sealing portion (6) is inclined toward the second end of the piston body (3).

3. The piston assembly according to claim 2, characterized in that The sealing ring (4) also includes: A connecting portion (7), a recessed groove (9) is arranged on the outer peripheral surface of the piston body (3), the recessed groove (9) is arranged along the circumference of the piston body (3), the connecting portion (7) is located in the recessed groove (9), and the connecting portion (7) and the recessed groove (9) are matched in shape.

4. The piston assembly according to claim 3, characterized in that: The connecting portion (7) is provided with a bent end (8), the bent end (8) faces the first end of the piston body (3), and the bent end (8) is bent toward the outer peripheral surface of the piston body (3).

5. The piston assembly according to claim 4, characterized in that: The two opposite inner side walls of the sink groove (9) are respectively a first side wall and a second side wall, the first side wall is close to the first end of the piston body (3), the second side wall is close to the second end of the piston body (3), the outer diameter of the first side wall is smaller than the outer diameter of the second side wall, and the bent end (8) abuts against the first side wall.

6. The piston assembly according to claim 4, characterized in that: The second end of the piston body (3) is provided with a groove (10), and the groove (10) is suitable for the spring (1) to be embedded.

7. The piston assembly according to claim 6, characterized in that: The groove bottom shape of the groove (10) is suitable for matching with the end of the spring (1).

8. The piston assembly according to claim 3, characterized in that: The connecting portion (7), the first sealing portion (5) and the second sealing portion (6) are constructed as an integrated structure.

9. A differential, characterized in that: include: Spring (1) and cylinder sleeve (2); The piston assembly according to any one of claims 1 to 8, wherein the piston body (3) of the piston assembly is in sliding contact with the inner wall of the cylinder sleeve (2), and the piston body (3) is in abutment with the spring (1).

10. A working machine, characterized in that: include: The differential as claimed in claim 9.

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