Oil seepage prevention piston
By using a split piston structure and a labyrinthine oil circuit design, the problem of poor lubricant sealing is solved, achieving efficient sealing and low-cost production, and improving the piston's performance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-07
- Publication Date
- 2026-04-03
AI Technical Summary
The existing piston has poor lubricant sealing, resulting in rapid lubricant consumption, frequent refills, and easy splashing, which affects its performance.
It adopts a split piston structure, which uses the nested cooperation of sealing convex strips and sealing grooves, combined with a labyrinth oil circuit design and staggered stop block setting to form a three-dimensional structure, which enhances the oil sealing performance. The positioning block and guide cone ensure precise positioning and the fit of the sealing plate.
It significantly improves the sealing performance of lubricating oil, reduces manufacturing costs and friction loss, extends service life, simplifies the processing, and reduces maintenance costs.
Smart Images
Figure CN224079226U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a piston inside a pump body, and more specifically, to an oil-proof piston. Background Technology
[0002] A piston is a component commonly used in the cylinder bore of various types of engines. It abuts against the inner wall of the cylinder and can reciprocate along the inner wall of the cylinder when subjected to pressure on one side. The shape of the piston is configured to match the inner wall of the cylinder, and a lubrication layer is provided in the middle of the piston to provide lubrication during the piston's movement. Therefore, lubricating oil is usually added inside the piston to reduce friction during the piston's movement in the cylinder.
[0003] Currently, pistons on the market have poor sealing performance for lubricating oil, resulting in rapid consumption of lubricating oil during piston use, causing oil waste and shortening the piston's service life. This necessitates frequent addition of lubricating oil during operation, and excessive lubricating oil can cause splashing during piston movement, leading to poor performance. Utility Model Content
[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide an oil-proof piston with better oil sealing performance and convenient production and processing.
[0005] To achieve the above objectives, the present invention provides the following technical solution: an oil-proof piston, comprising a first mounting body and a second mounting body, wherein the first mounting body has: a first outer support frame, a first inner support frame and a first support member disposed between the first outer support frame and the first inner support frame, wherein the first support member and the first outer support frame are provided with sealing protrusions, and the first outer support frame and the first inner support frame are provided with a plurality of first oil chambers through the first support member;
[0006] The second mounting body has: a second outer support frame, a second inner support frame, and a second support member disposed between the second outer support frame and the second inner support frame. The second support member and the second outer support frame are provided with sealing grooves that match the sealing protrusions of the first support member. The second outer support frame and the second inner support frame are provided with a plurality of second oil chambers through the second support member.
[0007] The present invention is further configured such that: the first outer support frame is provided with a plurality of first outer blocks in the first oil cavity along its circumferential direction, and the first inner support frame is provided with a plurality of first inner blocks in the first oil cavity along its circumferential direction, and the first outer blocks and the first inner blocks are staggered in the first oil cavity.
[0008] Preferably, the second outer support frame is provided with a plurality of second outer blocks in the first oil cavity along its circumferential direction, and the second inner support frame is provided with a plurality of second inner blocks in the second oil cavity along its circumferential direction, and the second outer blocks and the second inner blocks are staggered in the second oil cavity.
[0009] The present invention is further configured such that: the first mounting body is provided with a connecting protrusion, the connecting protrusion is provided with a positioning block, the second mounting body is provided with a mounting hole that matches the connecting protrusion, the mounting hole is provided with a positioning groove that matches the positioning block, and after the connecting protrusion is inserted into the mounting hole, the sealing protrusion and the sealing groove fit together.
[0010] Preferably, the blocks in the first mounting body and the second mounting body are arranged alternately.
[0011] The present invention is further configured such that: sealing plates are provided at both ends of the piston, and the sealing plates are installed as follows: the sealing plates are placed on the surface of the first mounting body or the second mounting body, and the sealing plates are pressed tightly against the upper / lower surface of the piston.
[0012] The present invention is further configured such that: after the first mounting body and the second mounting body are assembled to form a piston, a lubrication groove is provided in the middle of the piston.
[0013] By adopting the above technical solution, the following beneficial effects are achieved: 1. This application, through the interlocking setting of the split piston structure, enables the piston structure to be quickly positioned after production. The first mounting body and the second mounting body form a barrier against oil through the nested cooperation of the sealing protrusion and the sealing groove. At the same time, by staggering multiple baffles in both the first mounting body and the second mounting body to form a labyrinthine oil path, the oil leakage resistance is significantly improved. By setting the first mounting body and the second mounting body as a mutually separate structure, the difficulty of processing a single workpiece is simplified, allowing the workpiece to be formed by casting or stamping, reducing manufacturing costs. Meanwhile, the guide cone positions the sealing plate, thereby ensuring the sealing plate fits against the piston end face during stamping, preventing leakage during processing. At the same time, after the first mounting body and the second mounting body are assembled, a lubrication groove smaller than the inner wall of the cylinder can be formed in the middle of the piston, reducing friction loss. The overall structure has good sealing performance, is simple to process, and can be automatically and continuously produced.
[0014] 2. Furthermore, the lubricating oil is sealed using a three-dimensional structure. Specifically, in the radial direction of the piston, a seal is formed by the interference fit between the sealing protrusion and the groove. In the axial direction of the piston, end face sealing is achieved by stamping sealing plates on the upper and lower surfaces of the piston. At the same time, a labyrinthine oil passage is formed inside the piston by staggered baffles, which prolongs the meandering path of the oil. The staggered arrangement of the baffles, for example, the first outer baffle is circumferentially offset from the first inner baffle and the second outer baffle, further cutting the oil cavity inside the piston and forming a pressure equalization area, thus avoiding seal failure due to local oil accumulation.
[0015] 3. Simultaneously, during the assembly of the first and second mounting bodies, positioning blocks and slots are used to ensure precise positioning of each protrusion and groove during installation, eliminating assembly errors and preventing insufficient sealing. Furthermore, the first and second mounting bodies can be mass-produced using molds, resulting in high processing efficiency. During installation, connecting protrusions are inserted into mounting holes, and positioning blocks automatically lock to prevent misalignment, improving overall pressure resistance. Moreover, the mounting bodies can be replaced independently, reducing maintenance costs throughout their lifespan.
[0016] 4. Furthermore, during the piston machining process, the positioning technology of the guide cone ensures precise matching between the guide cone and the piston end face during installation. This guarantees that the sealing plate, after being positioned by the guide cone, is located in the center of the piston end face, preventing eccentricity during stamping. Specifically, the sealing plate is annularly arranged. When the sealing plate is installed on the guide cone, it can move along the height direction of the guide cone until the diameter of the guide cone at its current position is greater than the inner diameter of the sealing plate. At this point, the sealing plate remains stationary and horizontal on the guide cone, ensuring the accuracy of the sealing plate during the stamping process and resulting in good stamping performance. Attached Figure Description
[0017] Figure 1 This is a cross-sectional view of a specific structure of an embodiment of the oil-proof piston of this utility model;
[0018] Figure 2 This is a schematic diagram of the specific structure of the first support body in an embodiment of an oil-proof piston according to the present invention;
[0019] Figure 3 This is a schematic diagram of the specific structure of the second support body in an embodiment of the oil-proof piston of this utility model;
[0020] The reference numerals in the figure are as follows: 1. First mounting body; 11. First outer support frame; 12. First inner support frame; 13. First support member; 14. Sealing protrusion; 15. First oil cavity; 16. First outer stop block; 17. First inner stop block; 2. Second mounting body; 21. Second outer support frame; 22. Second inner support frame; 23. Second support member; 24. Sealing groove; 25. Second oil cavity; 26. Second outer stop block; 27. Second inner stop block; 3. Connecting protrusion; 4. Positioning block; 5. Mounting hole; 6. Positioning slot; 7. Lubrication groove. Detailed Implementation
[0021] Reference Figures 1 to 3 The following is a further description of an embodiment of the oil-proof piston of this utility model.
[0022] For ease of explanation, spatial relative terms such as “up,” “down,” “left,” and “right” are used in the embodiments to describe the relationship of one element or feature shown in the figures relative to another element or feature. It should be understood that, in addition to the orientations shown in the figures, spatial terms are intended to include different orientations of the device in use or operation. For example, if the device in the figures is inverted, an element described as being “down” of other elements or features would be positioned “up” of those other elements or features. Therefore, the exemplary term “down” can encompass both up and down orientations. The device may be positioned in other ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.
[0023] Moreover, relational terms such as “first” and “second” are used merely to distinguish one component from another that has the same name, without necessarily requiring or implying any such actual relationship or order between the components.
[0024] An oil-proof piston includes a first mounting body 1 and a second mounting body 2. The first mounting body 1 has: a first outer support frame 11, a first inner support frame 12, and a first support member 13 disposed between the first outer support frame 11 and the first inner support frame 12. The first support member 13 and the first outer support frame 11 are provided with sealing protrusions 14. The first outer support frame 11 and the first inner support frame 12 are connected by the first support member 13 to form a plurality of first oil chambers 15.
[0025] The second mounting body 2 has: a second outer support frame 21, a second inner support frame 22, and a second support member 23 disposed between the second outer support frame 21 and the second inner support frame 22. The second support member 23 and the second outer support frame 21 are provided with sealing grooves 24 that match the sealing protrusions 14 of the first support member 13. The second outer support frame 21 and the second inner support frame 22 are provided with a plurality of second oil chambers 25 through the second support member 23.
[0026] The first outer support frame 11 is provided with a plurality of first outer blocks 16 in the first oil cavity 15 along its circumferential direction, and the first inner support frame 12 is provided with a plurality of first inner blocks 17 in the first oil cavity 15 along its circumferential direction. The first outer blocks 16 and the first inner blocks 17 are staggered in the first oil cavity 15.
[0027] Preferably, the second outer support frame 21 is provided with a plurality of second outer blocks 26 in the first oil cavity 15 along its circumferential direction, and the second inner support frame 22 is provided with a plurality of second inner blocks 27 in the second oil cavity 25 along its circumferential direction, and the second outer blocks 26 and the second inner blocks 27 are staggered in the second oil cavity 25.
[0028] The first mounting body 1 is also provided with a connecting protrusion 3, and the connecting protrusion 3 is provided with a positioning block 4. The second mounting body 2 is provided with a mounting hole 5 that matches the connecting protrusion 3. The mounting hole 5 is provided with a positioning groove 6 that matches the positioning block 4. After the connecting protrusion 3 is inserted into the mounting hole 5, the sealing protrusion 14 and the sealing groove 24 fit together.
[0029] Preferably, the blocks in the first mounting body 1 and the second mounting body 2 are arranged alternately.
[0030] The piston is provided with sealing plates at both ends. The sealing plates are installed as follows: the sealing plates are placed on the surface of the first mounting body 1 or the second mounting body 2, and the sealing plates are pressed tightly against the upper / lower surface of the piston.
[0031] After the first mounting body 1 and the second mounting body 2 are assembled to form a piston, a lubrication groove 7 is provided in the middle of the piston.
[0032] This application utilizes an interlocking mechanism in a split piston structure, enabling rapid positioning of the piston structure after production. The first mounting body 1 and the second mounting body 2 are interlocked by a sealing protrusion 14 and a sealing groove 24 to block oil flow. Simultaneously, multiple staggered baffles within both the first and second mounting bodies 1 and 2 form a labyrinthine oil passage, significantly enhancing oil resistance. By separating the first and second mounting bodies 1 and 2, the processing of individual workpieces is simplified, allowing for casting or stamping, reducing manufacturing costs. Furthermore, the guide cone positions the sealing plate, ensuring its contact with the piston end face during stamping and preventing leakage during processing. Additionally, after the first and second mounting bodies 1 and 2 are assembled, a lubrication groove 7 smaller than the cylinder wall is formed in the center of the piston, reducing friction loss. The overall structure offers good sealing, is simple to process, and allows for automated continuous production.
[0033] Furthermore, the lubricating oil is sealed using a three-dimensional structure. Specifically, in the radial direction of the piston, a seal is formed by the interference fit between the sealing protrusion 14 and the groove. In the axial direction of the piston, end face sealing is achieved by stamping sealing plates on the upper and lower surfaces of the piston. At the same time, a labyrinthine oil passage is formed inside the piston by staggered baffles, which prolongs the meandering path of the oil. The staggered arrangement of the baffles, for example, the first outer baffle 16 is circumferentially offset from the first inner baffle 17 and the second outer baffle 26, further cuts the oil cavity inside the piston, forming a pressure equalization area and preventing seal failure due to local oil accumulation.
[0034] Meanwhile, during the assembly of the first mounting body 1 and the second mounting body 2, positioning blocks 4 and slots are used to ensure precise positioning of each protrusion and groove during installation, eliminating assembly errors and preventing insufficient sealing. Furthermore, the first mounting body 1 and the second mounting body 2 can be mass-produced using molds, resulting in high processing efficiency. During installation, connecting protrusions 3 and mounting holes 5 are inserted, and the positioning blocks 4 automatically lock to prevent misalignment, improving the overall pressure resistance. In addition, the mounting bodies can be replaced independently, reducing maintenance costs throughout their life cycle.
[0035] Furthermore, during the piston machining process, the positioning technology of the guide cone ensures precise matching between the guide cone and the piston end face during installation. This guarantees that the sealing plate, after being positioned by the guide cone, is located in the center of the piston end face, preventing eccentricity during stamping. Specifically, the sealing plate is annularly arranged. When the sealing plate is installed on the guide cone, it can move along the height direction of the guide cone until the diameter of the guide cone at its current position is greater than the inner diameter of the sealing plate. At this point, the sealing plate remains stationary and horizontal on the guide cone, ensuring the accuracy of the sealing plate during the stamping process and resulting in good stamping performance.
[0036] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any ordinary changes and substitutions made by those skilled in the art within the scope of the technical solution of the present utility model should be included within the protection scope of the present utility model.
Claims
1. An oil-proof piston, comprising a first mounting body (1) and a second mounting body (2), characterized in that, The first mounting body (1) has: a first outer support frame (11), a first inner support frame (12) and a first support member (13) disposed between the first outer support frame (11) and the first inner support frame (12). The first support member (13) and the first outer support frame (11) are provided with sealing protrusions (14). The first outer support frame (11) and the first inner support frame (12) are connected by the first support member (13) to form a plurality of first oil chambers (15). The second mounting body (2) has: a second outer support frame (21), a second inner support frame (22) and a second support member (23) disposed between the second outer support frame (21) and the second inner support frame (22). The second support member (23) and the second outer support frame (21) are provided with sealing grooves (24) that match the sealing protrusions (14) of the first support member (13). The second outer support frame (21) and the second inner support frame (22) are connected by the second support member (23) to form a plurality of second oil chambers (25).
2. The oil-proof piston according to claim 1, characterized in that, The first outer support frame (11) is provided with a plurality of first outer blocks (16) in the first oil cavity (15) along its circumferential direction, and the first inner support frame (12) is provided with a plurality of first inner blocks (17) in the first oil cavity (15) along its circumferential direction. The first outer blocks (16) and the first inner blocks (17) are staggered in the first oil cavity (15).
3. The oil-proof piston according to claim 2, characterized in that, The second outer support frame (21) is provided with a plurality of second outer blocks (26) in the first oil cavity (15) along its circumferential direction, and the second inner support frame (22) is provided with a plurality of second inner blocks (27) in the second oil cavity (25) along its circumferential direction. The second outer blocks (26) and the second inner blocks (27) are staggered in the second oil cavity (25).
4. The oil-proof piston according to claim 1, characterized in that, The first mounting body (1) is also provided with a connecting protrusion (3), and the connecting protrusion (3) is provided with a positioning block (4). The second mounting body (2) is provided with a mounting hole (5) that matches the connecting protrusion (3), and the mounting hole (5) is provided with a positioning groove (6) that matches the positioning block (4). After the connecting protrusion (3) is inserted into the mounting hole (5), the sealing protrusion (14) and the sealing groove (24) fit together.
5. The oil-proof piston according to claim 3, characterized in that, The blocks in the first mounting body (1) and the second mounting body (2) are arranged alternately.
6. The oil-proof piston according to claim 1, characterized in that, The piston is provided with sealing plates at both ends. The sealing plates are installed as follows: the sealing plates are placed on the surface of the first mounting body (1) or the second mounting body (2), and the sealing plates are pressed tightly against the upper / lower surface of the piston.
7. The oil-proof piston according to claim 1, characterized in that, After the first mounting body (1) and the second mounting body (2) are assembled to form a piston, a lubrication groove (7) is provided in the middle of the piston.