Anti-leakage cylinder piston and manufacturing method thereof

Abstract

The application discloses an oil leakage prevention cylinder piston and a manufacturing method thereof. The oil leakage prevention cylinder piston comprises a piston body which is a hollow cylinder structure with one end closed and the other end open. The open end of the piston body is connected with a sealing cover. An annular groove is arranged on the outer wall of the piston body. An oil injection hole is arranged on the side wall of the piston body at one side of the annular groove. An inner rod body is arranged through the sealing cover. The outer wall of the inner rod body is sealed with a middle through hole of the sealing cover through an inner rod body sealing ring. A piston disc at the end of the inner rod body is located in the inner cavity of the piston body. A piston disc sealing ring is arranged on the outer wall of the piston disc. An inner wall limiting protrusion which can prevent the piston disc from moving to the oil injection hole is arranged in the inner cavity of the piston body. The piston body is pushed in two directions by oil pressure and the sealing cover to correspondingly move the piston rod, so that the piston rod is one-way pushed and reset. The piston rod and the piston body do not need to adopt a threaded connection structure.

Description

Technical Field

[0001] This invention relates to the field of hydraulic cylinder manufacturing technology, and more particularly to a leak-proof hydraulic cylinder piston and its manufacturing method. Background Technology

[0002] Hydraulic cylinder pistons are typically designed with a piston body that passes through a piston rod. The piston body has a threaded hole in the middle that is screwed to the piston rod for fixation. Regardless of whether one end of the piston rod extends out of the side wall of the piston body, the sealing effect in the middle of the piston with this structure is not ideal. Therefore, the structure of this piston needs further improvement. Summary of the Invention

[0003] The first technical problem to be solved by the present invention is to provide a leak-proof oil cylinder piston with the piston rod and piston body integrally set and good sealing effect in the middle of the piston, in view of the above-mentioned existing technology.

[0004] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: This anti-leakage cylinder piston includes a piston body that can be disposed in the inner cavity of the cylinder. The piston body is characterized by being a hollow cylindrical structure with one end closed and the other end open. The open end of the piston body is connected to a sealing cap. An annular groove for connecting a piston body sealing ring is provided on the outer wall of the piston body. An oil injection hole communicating with the inner cavity of the piston body and the inner cavity of the cylinder is provided on the side wall of the piston body on one side of the annular groove. The inner rod passes through the sealing cap. The outer wall of the inner rod is sealed to the central through hole of the sealing cap through the inner rod sealing ring. The piston disc at the end of the inner rod is located in the inner cavity of the piston body. A piston disc sealing ring is provided on the outer wall of the piston disc. An inner wall limiting protrusion that prevents the piston disc from moving to the oil injection hole is provided in the inner cavity of the piston body.

[0005] As an improvement, the opening of the oil injection hole can preferably be slit-shaped, and the axial cross-section of the oil injection hole is L-shaped.

[0006] In a further improvement, there are preferably two oil injection holes, which are symmetrically arranged on the outer wall of the piston body.

[0007] As a further improvement, a flange may preferably be provided on the outer ring of the sealing cover, and a connection hole that can be fixed to the flange is provided on the end face of the piston body opening.

[0008] As an improvement, an outer wall protrusion may preferably be provided on the outer wall of the piston body, and the annular groove is provided on the outer wall protrusion. There are two sets of annular grooves, and the two sets of annular grooves are spaced apart along the axial direction of the piston body.

[0009] In a further improvement, the bottom corners of the annular groove can preferably be right angles that can fill the sealing ring, and a side wall groove can be provided on the side wall of the annular groove to reduce the difficulty of removing the sealing ring.

[0010] As a further improvement, an annular relief groove can preferably be provided at the connection between the outer wall protrusion and the outer wall of the piston body.

[0011] As an improvement, the apex angle of the closed end of the piston body can preferably be rounded, and the end face of the closed end of the piston body is a plane with positioning holes distributed on the plane. The plane can preferably be connected to an outer rod that can be inserted into the oil cylinder.

[0012] The second technical problem to be solved by the present invention is to provide a method for manufacturing a leak-proof oil cylinder piston with the piston rod and piston body integrally set and good sealing effect in the middle of the piston, in view of the above-mentioned existing technology.

[0013] The technical solution adopted by this invention to solve the above-mentioned technical problem is: a method for manufacturing the piston of this anti-leakage cylinder, characterized by including the following steps:

[0014] 1. Make a piston body, so that the piston body is a hollow cylindrical structure with one end closed and the other end open. A connecting hole is provided on the end face of the piston body opening. An annular groove for connecting the piston body sealing ring is provided on the outer wall of the piston body. An oil injection hole is provided on the side wall of the piston body near the annular groove on the side of the closed end. An inner wall limiting protrusion is made in the inner cavity of the piston body on the other side of the annular groove.

[0015] 2. Refine the inner wall of the piston body from the inner wall limiting protrusion to the piston body opening to make the inner wall of the piston body flat and smooth.

[0016] 3. Fabricate the inner rod body and the outer rod body, and set a piston disc at one end of the inner rod body, and set a piston disc sealing ring on the outer ring of the piston disc;

[0017] 4. Insert the piston disc of the inner rod into the inner cavity of the piston body, and position the piston disc closer to the opening of the piston body than the oil injection hole;

[0018] 5. Secure the sealing cap to the opening of the piston body to complete the manufacturing of the anti-leakage piston.

[0019] As an improvement, in step one, an outer wall protrusion can preferably be made on the outer wall of the piston body. The annular groove is set on the outer wall protrusion. There are two sets of annular grooves, which are spaced apart along the axial direction of the piston body. The bottom angles of the annular grooves are all right angles that can fill the sealing ring. A side wall groove is provided on the side wall of the annular groove to reduce the difficulty of removing the sealing ring. An annular relief groove is provided at the connection between the outer wall protrusion and the outer wall of the piston body.

[0020] Compared with the prior art, the advantages of this invention are as follows: the piston body pushes the piston rod to move in two corresponding directions through hydraulic pressure and the sealing cover, realizing unidirectional pushing and resetting of the piston rod. No threaded connection structure is required between the piston rod and the piston body, thus preventing hydraulic oil from flowing between the two chambers of the cylinder through the threaded connection, preventing hydraulic oil leakage from the threaded connection, maintaining good piston rod pushing effect, and extending the service life of the cylinder. Because the piston body pushes the piston to move through hydraulic oil, the piston can be designed as a unidirectional pushing and resetting structure. For applications requiring only unidirectional pushing and resetting, it can be directly applied, reducing space occupation. The hydraulic oil entering the piston body through the oil injection hole provides initial power to the piston rod, improving the response speed of large-diameter piston rods and resulting in better performance. Attached Figure Description

[0021] Figure 1 This is a perspective view of an embodiment of the present invention;

[0022] Figure 2 for Figure 1 Exploded structural diagram;

[0023] Figure 3 This is a perspective view of the embodiment of the invention after it has been installed in the inner cavity of the oil cylinder;

[0024] Figure 4 yes Figure 2 A three-dimensional view of the piston body;

[0025] Figure 5 yes Figure 4 A three-dimensional view from another angle;

[0026] Figure 6 yes Figure 4 Top view;

[0027] Figure 7 yes Figure 6 Cross-sectional view along line AA;

[0028] Figure 8 yes Figure 4 Enlarged view of section I;

[0029] Figure 9 yes Figure 7 Enlarged view of Part II;

[0030] Figure 10 yes Figure 7 Enlarged view of Part III;

[0031] Figure 11 This is a perspective view of the second embodiment of the present invention. Detailed Implementation

[0032] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0033] like Figures 1 to 10 As shown, the anti-leakage cylinder piston of this embodiment includes a piston body 1 that can be disposed in the inner cavity of the cylinder. The piston body 1 is a hollow cylindrical structure with one end closed and the other end open. The open end of the piston body 1 is connected to the sealing cap 4. An annular groove 12 for connecting the piston body sealing ring is provided on the outer wall of the piston body 1. An oil injection hole 13 communicating with the inner cavity of the piston body and the inner cavity of the cylinder 3 is provided on the side wall of the piston body on one side of the annular groove 12. The inner rod 2 passes through the sealing cap 4. The outer wall of the inner rod 2 is sealed to the middle through hole of the sealing cap 4 through the inner rod sealing ring. The piston disc 21 at the end of the inner rod is located in the inner cavity of the piston body 1. A piston disc sealing ring is provided on the outer wall of the piston disc 21. An inner wall limiting protrusion 11 that can prevent the piston disc 21 from moving to the oil injection hole 13 is provided in the inner cavity of the piston body 1. The opening of the oil injection hole 13 is slit-shaped, and the axial cross section of the oil injection hole 13 is L-shaped. There are two oil filling holes 13, which are symmetrically arranged on the outer wall of the piston body 1. A flange is provided on the outer ring of the sealing cover 4, and a connection hole 17 is provided on the end face of the piston body opening to be fixed to the flange.

[0034] An outer wall protrusion 10 is provided on the outer wall of the piston body 1, and an annular groove 12 is provided on the outer wall protrusion 10. There are two sets of annular grooves 12, which are spaced apart along the axial direction of the piston body 1. The bottom angles of the annular grooves 12 are all right angles that can fill the sealing ring. Side wall grooves 14 are provided on the side walls of the annular grooves to reduce the difficulty of removing the sealing ring. An annular relief groove 15 is provided at the connection between the outer wall protrusion 10 and the outer wall of the piston body.

[0035] The manufacturing method of the aforementioned anti-leakage cylinder piston includes the following steps:

[0036] 1. Make piston body 1, so that piston body 1 is a hollow cylindrical structure with one end closed and the other end open. A connecting hole 17 is provided on the end face of the piston body opening. An annular groove 12 for connecting piston body sealing ring is provided on the outer wall of piston body 1. An oil injection hole 13 is provided on the side wall of piston body near the closed end of the annular groove 12. An inner wall limiting protrusion 11 is made in the inner cavity of piston body 1 on the other side of the annular groove 12.

[0037] 2. Fine-tune the inner wall of the piston body 1 from the inner wall limiting protrusion 11 to the piston body opening, so that the inner wall of the piston body is flat and smooth.

[0038] 3. Make inner rod 2 and outer rod 20, set piston disc 21 at one end of inner rod, and set piston disc sealing ring on the outer ring of piston disc 21;

[0039] Fourth, insert the piston disc 21 of the inner rod 2 into the inner cavity of the piston body 1, and the position of the piston disc 21 is closer to the opening of the piston body 1 than the oil injection hole 13.

[0040] 5. Fix the sealing cap 4 to the opening of the piston body 1 to complete the production of the anti-leakage piston.

[0041] In step one, an outer wall protrusion 10 is made on the outer wall of piston body 1, and an annular groove 12 is set on the outer wall protrusion 10. There are two sets of annular grooves 12, and the two sets of annular grooves 12 are spaced apart along the axial direction of piston body 1. The bottom corners of the annular grooves 12 are all right angles that can fill the sealing ring. A side wall groove 14 is set on the side wall of the annular groove to reduce the difficulty of removing the sealing ring. An annular relief groove 15 is set at the connection between the outer wall protrusion 10 and the outer wall of piston body 1.

[0042] The piston body 1 is housed within the cylinder 3, dividing the cylinder into a front chamber and a rear chamber. When oil enters the front chamber and exits the rear chamber, the hydraulic oil pushes the piston body 1 towards the rear chamber, thereby pushing the inner rod 2 (piston rod) out of the cylinder 3. When oil enters the rear chamber and exits the front chamber, the hydraulic oil pushes the piston body 1 in the opposite direction, resetting the piston rod. Alternatively, the outer rod 20 can be fixed at the closed end of the piston body 1 to achieve bidirectional pushing functionality. The piston body 1 has an oil injection hole 13 on its surface. When the piston rod extends out of the cylinder 3, hydraulic oil first enters the inner chamber of the piston body 1 to provide initial power to the piston disc 21, improving the response speed of the large-diameter piston and making the entire cylinder assembly more responsive.

[0043] like Figure 11 As shown, the second embodiment of the anti-leakage cylinder piston includes a piston body 1 that can be disposed in the inner cavity of the cylinder. The piston body 1 is a hollow cylindrical structure with one end closed and the other end open. The open end of the piston body 1 is connected to the sealing cap 4. An annular groove 12 for connecting the piston body sealing ring is provided on the outer wall of the piston body 1. An oil injection hole 13 communicating with the inner cavity of the piston body and the inner cavity of the cylinder 3 is provided on the side wall of the piston body on one side of the annular groove 12. The inner rod 2 passes through the sealing cap 4. The outer wall of the inner rod 2 is sealed to the middle through hole of the sealing cap 4 through the inner rod sealing ring. The piston disc 21 at the end of the inner rod is located in the inner cavity of the piston body 1. A piston disc sealing ring is provided on the outer wall of the piston disc 21. An inner wall limiting protrusion 11 that can prevent the piston disc 21 from moving to the oil injection hole 13 is provided in the inner cavity of the piston body 1. The opening of the oil injection hole 13 is slit-shaped, and the axial cross section of the oil injection hole 13 is L-shaped. There are two oil injection holes 13, which are symmetrically arranged on the outer wall of the piston body 1. A flange is provided on the outer ring of the sealing cover 4, and a connection hole 17 is provided on the end face of the piston body opening to be fixed to the flange. The apex corner of the closed end of the piston body 1 is rounded, and the end face of the closed end of the piston body 1 is flat. Positioning holes 16 are distributed on the flat surface, and the flat surface is connected to the outer rod 20 that can be inserted into the oil cylinder 3.

[0044] An outer wall protrusion 10 is provided on the outer wall of the piston body 1, and an annular groove 12 is provided on the outer wall protrusion 10. There are two sets of annular grooves 12, which are spaced apart along the axial direction of the piston body 1. The bottom angles of the annular grooves 12 are all right angles that can fill the sealing ring. Side wall grooves 14 are provided on the side walls of the annular grooves to reduce the difficulty of removing the sealing ring. An annular relief groove 15 is provided at the connection between the outer wall protrusion 10 and the outer wall of the piston body.

[0045] The manufacturing method of the aforementioned anti-leakage cylinder piston includes the following steps:

[0046] 1. Make piston body 1, so that piston body 1 is a hollow cylindrical structure with one end closed and the other end open. A connecting hole 17 is provided on the end face of the piston body opening. An annular groove 12 for connecting piston body sealing ring is provided on the outer wall of piston body 1. An oil injection hole 13 is provided on the side wall of piston body near the annular groove 12 on the side of the closed end. An inner wall limiting protrusion 11 is made in the inner cavity of piston body 1 on the other side of the annular groove 12. The top corner of the closed end of piston body 1 is rounded. The end face of the closed end of piston body 1 is flat. Evenly distributed positioning holes 16 are made on the flat surface.

[0047] 2. Fine-tune the inner wall of the piston body 1 from the inner wall limiting protrusion 11 to the piston body opening, so that the inner wall of the piston body is flat and smooth.

[0048] 3. Make inner rod 2 and outer rod 20, set piston disc 21 at one end of inner rod, and set piston disc sealing ring on the outer ring of piston disc 21;

[0049] Fourth, insert the piston disc 21 of the inner rod 2 into the inner cavity of the piston body 1, and the position of the piston disc 21 is closer to the opening of the piston body 1 than the oil injection hole 13.

[0050] 5. Secure the sealing cap 4 to the opening of the piston body 1;

[0051] 6. Fix the outer rod 20 to the end face of the closed end of the piston body 1 to complete the manufacturing of the anti-leakage piston.

[0052] In step one, an outer wall protrusion 10 is made on the outer wall of piston body 1, and an annular groove 12 is set on the outer wall protrusion 10. There are two sets of annular grooves 12, and the two sets of annular grooves 12 are spaced apart along the axial direction of piston body 1. The bottom corners of the annular grooves 12 are all right angles that can fill the sealing ring. A side wall groove 14 is set on the side wall of the annular groove to reduce the difficulty of removing the sealing ring. An annular relief groove 15 is set at the connection between the outer wall protrusion 10 and the outer wall of piston body 1.

Claims

1. A leak-proof hydraulic cylinder piston, comprising a piston body (1) that can be disposed within the inner cavity of the hydraulic cylinder, characterized in that: The piston body (1) is a hollow cylindrical structure with one end closed and the other end open. The open end of the piston body (1) is connected to the sealing cap (4). An annular groove (12) for connecting the piston body sealing ring is provided on the outer wall of the piston body (1). An oil injection hole (13) for connecting the inner cavity of the piston body and the inner cavity of the oil cylinder (3) is provided on the side wall of the piston body on one side of the annular groove (12). The inner rod (2) passes through the sealing cap (4). The outer wall of the inner rod (2) is sealed with the middle through hole of the sealing cap (4) through the inner rod sealing ring. The piston disc (21) at the end of the inner rod is located in the inner cavity of the piston body (1). A piston disc sealing ring is provided on the outer wall of the piston disc (21). An inner wall limiting protrusion (11) that can prevent the piston disc (21) from moving to the oil injection hole (13) is provided in the inner cavity of the piston body (1).

2. The anti-leakage cylinder piston according to claim 1, characterized in that: The opening of the oil injection hole (13) is slit-shaped, and the axial cross section of the oil injection hole (13) is L-shaped.

3. The anti-leakage cylinder piston according to claim 2, characterized in that: There are two oil injection holes (13), which are symmetrically arranged on the outer wall of the piston body (1).

4. The anti-leakage cylinder piston according to claim 3, characterized in that: A flange is provided on the outer ring of the sealing cover (4), and a connection hole (17) is provided on the end face of the piston body opening to be fixed with the flange.

5. The anti-leakage cylinder piston according to any one of claims 1 to 4, characterized in that: An outer wall protrusion (10) is provided on the outer wall of the piston body (1), and an annular groove (12) is provided on the outer wall protrusion (10). There are two sets of annular grooves (12), and the two sets of annular grooves (12) are spaced apart along the axial direction of the piston body (1).

6. The anti-leakage cylinder piston according to claim 5, characterized in that: The bottom corners of the annular groove (12) are all right angles that can fill the sealing ring, and a side wall groove (14) is provided on the side wall of the annular groove to reduce the difficulty of removing the sealing ring.

7. The anti-leakage cylinder piston according to claim 5, characterized in that: An annular relief groove (15) is provided at the connection between the outer wall protrusion (10) and the outer wall of the piston body.

8. The anti-leakage cylinder piston according to any one of claims 1 to 4, characterized in that: The top corner of the closed end of the piston body (1) is rounded, and the end face of the closed end of the piston body (1) is a plane. Positioning holes (16) are distributed on the plane, and the plane is connected to the outer rod body (20) that can be inserted into the oil cylinder (3).

9. A method for manufacturing a leak-proof hydraulic cylinder piston according to any one of claims 1 to 4, characterized in that: Includes the following steps, 1. Make a piston body (1) so that the piston body (1) is a hollow cylindrical structure with one end closed and the other end open. A connecting hole (17) is provided on the end face of the piston body opening. An annular groove (12) for connecting the piston body sealing ring is provided on the outer wall of the piston body (1). An oil injection hole (13) is provided on the side wall of the piston body near the annular groove (12) on the side of the closed end. An inner wall limiting protrusion (11) is made in the inner cavity of the piston body (1) on the other side of the annular groove (12).

2. Fine-tune the inner wall of the piston body (1) from the inner wall limiting protrusion (11) to the piston body opening, so that the inner wall of the piston body is flat and smooth.

3. Make an inner rod (2) and an outer rod (20), and set a piston disc (21) at one end of the inner rod, and set a piston disc sealing ring on the outer ring of the piston disc (21); 4. Insert the piston disc (21) of the inner rod (2) into the inner cavity of the piston body (1), and the position of the piston disc (21) is closer to the opening of the piston body (1) than the oil injection hole (13); 5. Fix the sealing cap (4) to the opening of the piston body (1) to complete the production of the anti-leakage piston.

10. The manufacturing method according to claim 9, characterized in that: In step one, an outer wall protrusion (10) is made on the outer wall of the piston body (1). The annular groove (12) is set on the outer wall protrusion (10). There are two sets of annular grooves (12). The two sets of annular grooves (12) are spaced apart along the axial direction of the piston body (1). The bottom corners of the annular grooves (12) are all right angles that can fill the sealing ring. A side wall groove (14) is set on the side wall of the annular groove to reduce the difficulty of removing the sealing ring. An annular relief groove (15) is set at the connection between the outer wall protrusion (10) and the outer wall of the piston body.

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