Improved oil cylinder piston

Abstract

The utility model discloses an improved oil cylinder piston, relates to the technical field of pistons, and solves the technical problem of oil leakage of an oil cylinder caused by small contact area between an existing piston rod and the piston. The piston comprises a piston body and a guide sleeve, the guide sleeve is arranged at one end of the piston body, an annular groove and a first installation groove used for installing a sealing ring are formed in the guide sleeve, a second installation groove used for installing a dustproof ring is formed in the piston body, and a piston rod penetrates through the guide sleeve in a penetrating mode and is connected into the piston body in an inserted mode. According to the utility model, the stability and the sealing performance of the piston during movement are enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of pistons, and more specifically, it relates to an improved oil cylinder piston. Background Art

[0002] A hydraulic cylinder is an actuator in a hydraulic transmission system. It is an energy conversion device that converts hydraulic energy into mechanical energy. In machine tools, the application of oil cylinders is relatively common. For existing oil cylinder pistons, such as the patent document with the application number CN201921124678.5, it discloses an oil cylinder piston with good sealing performance, including a piston rod, and a piston assembly is provided at one end of the piston rod; the piston assembly includes a piston body, a piston rod groove is opened on one side of the piston body, one end of the piston rod is arranged inside the piston rod groove, a plurality of sealing ring grooves are opened on the piston body, a first groove and a second groove are opened on the piston body, fixing rings are fixedly arranged inside both the first groove and the second groove, and a connecting ring is fixedly arranged on one side of the fixing ring. In the oil cylinder piston in this document, the oil pressure inside the oil storage groove increases, thereby squeezing the first rubber ring to expand and expand outward, so that the inclined surface sealing sleeve is squeezed and pressed against the inner side of the hydraulic cylinder barrel, indirectly increasing the sealing performance between the piston body and the inner side of the hydraulic cylinder barrel, and achieving a very good sealing effect between the outer side of the piston body and the inner side of the hydraulic cylinder barrel.

[0003] Another example is the document with the application number CN202221881318.1, which discloses a single-acting oil cylinder piston, relating to the technical field of oil cylinders. It includes a piston body, and a unloading hole for installing a drain valve rod is opened on the piston body. The unloading hole includes a small-diameter section and a large-diameter section. The drain valve rod is slidably matched with the small-diameter section. A sealing ring groove for sleeving a sealing ring is opened on the outer periphery of the piston body. The unloading hole further includes an enlarged hole section, and the aperture of the enlarged hole section is larger than that of the small-diameter section. The small-diameter section is located between the enlarged hole section and the large-diameter section; a first conical chamfer is provided at the outer end of the enlarged hole section, and the taper of the first conical chamfer is the same as that of the plug conical surface of the drain valve rod. When the plug conical surface is pressed against the first conical chamfer, the unloading hole is blocked. This single-acting oil cylinder piston solves the problem that the unloading hole of the existing single-acting oil cylinder piston is prone to impact deformation, resulting in jamming of the drain valve rod and causing the oil cylinder to fail.

[0004] The pistons in the above two documents have a cylindrical structure, and the piston rod is directly inserted and fixed inside the piston. However, the contact area between the piston rod and the piston is small, and the working environment of the machine tool oil cylinder is poor, which easily causes the oil cylinder piston rod to be worn, resulting in poor sealing performance and serious oil leakage of the oil cylinder. Therefore, the sealing parts need to be frequently replaced, ultimately leading to high maintenance costs. Content of the Utility Model

[0005] The technical problem to be solved by the utility model is to provide an improved oil cylinder piston aiming at the deficiencies of the prior art, and solve the technical problem of oil leakage of the oil cylinder caused by the small contact area between the existing piston rod and the piston.

[0006] An improved oil cylinder piston of the present utility model includes a piston body and a guide sleeve. One end of the piston body is provided with a guide sleeve. An annular groove and a first installation groove for installing a sealing ring are provided in the guide sleeve. A second installation groove for installing a dust ring is provided in the piston body. A piston rod penetrates through the guide sleeve and is inserted into the piston body.

[0007] For further improvement, the piston body and the guide sleeve are of an integral structure.

[0008] Furthermore, the thickness of the second installation groove is 4 - 6 mm.

[0009] Even further, third installation grooves are provided on both sides of the piston body.

[0010] Even further, the length of the guide sleeve is 15 - 25 mm.

[0011] Even further, the diameter of the guide sleeve is smaller than the diameter of the piston body.

[0012] Even further, a limiting protrusion is provided in the piston body on the side of the second installation groove away from the guide sleeve.

[0013] Even further, a horn-shaped guiding port is installed at the opening of the end of the guide sleeve away from the piston body.

[0014] Beneficial effects

[0015] The advantages of the present utility model are as follows:

[0016] Based on the original piston body, the present utility model adds a guide sleeve. An annular groove and a first installation groove for installing a sealing ring are provided in the guide sleeve, and a second installation groove for installing a dust ring is provided in the piston body, increasing the length of the piston body and enhancing the stability and sealing performance during piston movement. Description of the drawings

[0017] Figure 1 It is a schematic diagram of the overall structure of the oil cylinder piston of the present utility model;

[0018] Figure 2 It is a schematic diagram of the installation of the piston rod of the present utility model on the oil cylinder piston.

[0019] Wherein: 1 - piston body, 2 - guide sleeve, 3 - annular groove, 4 - first installation groove, 5 - second installation groove, 6 - piston rod, 7 - third installation groove, 8 - limiting protrusion, 9 - guiding port. Specific embodiments

[0020] The following is a further description of the present utility model in conjunction with embodiments, but it does not constitute any limitation to the present utility model. Any person's limited modifications within the scope of the claims of the present utility model are still within the scope of the claims of the present utility model.

[0021] Referring to Figure 1 - Figure 2 , an improved oil cylinder piston of the present utility model includes a piston body 1 and a guide sleeve 2. One end of the piston body 1 is provided with a guide sleeve 2. An annular groove 3 and a first installation groove 4 for installing a sealing ring are provided in the guide sleeve 2. A second installation groove 5 for installing a dust ring is provided in the piston body 1. A piston rod 6 penetrates through the guide sleeve 2 and is inserted into the piston body 1.

[0022] The guide sleeve 2 is a product finely processed by mechanical cutting methods. Usually, it is made of polytetrafluoroethylene resin pressed into a blank, sintered and cooled, and then processed according to the geometric dimensions and tolerance ranges provided by customers. The guide sleeve has a wide range of applications and is more applied to occasions that require precise guidance to ensure the accuracy and stability of movement.

[0023] The piston body 1 and the guide sleeve 2 are of an integral structure to ensure the stability of the connection between the piston body 1 and the guide sleeve 2.

[0024] The annular groove 3 can prevent the axis deviation when the piston rod 6 moves and reduce the vibration and breakage of the piston rod 6.

[0025] The thickness of the second installation groove 5 is 5 mm. The diameter of the dust ring is 45 mm and the thickness of the dust ring is 5 mm. The installation groove of the dust ring is thickened, and a dust ring with a larger thickness can be installed, thereby improving the dust-proof effect.

[0026] Both sides of the piston body 1 are provided with third installation grooves 7. The third installation grooves 7 are used to install the piston body 1 into the oil cylinder.

[0027] A limit projection 8 is provided in the piston body 1 on the side of the second installation groove 5 away from the guide sleeve 2. The limit projection 8 is used to limit the sealing ring and fix the sealing ring to prevent the sealing ring from moving.

[0028] A trumpet-shaped guide port 9 is installed at the opening of the guide sleeve 2 away from the piston body 1. The guide port 9 facilitates the piston rod 6 to penetrate through the guide sleeve 2.

[0029] The length of the guide sleeve 2 is 20 mm. By means of the guide sleeve 2, the length of the piston is increased. The length of the piston is increased from the original 14 mm to 34 mm, increasing the contact area between the piston rod 6 and the piston and increasing the limit area of the piston rod 6, thereby reducing the wear of the piston rod 6 during vibration.

[0030] The diameter of the guide sleeve 2 is smaller than the diameter of the piston body 1. The guide sleeve 2 can better limit the piston rod 6, thereby reducing the wear when the piston rod 6 vibrates.

[0031] On the basis of the guide sleeve 2, a guide strip with a size of 35mm * 40mm * 6mm is installed, which can further increase the stability and sealing performance of the piston movement. The guide strip, also known as the guide ring, is mainly applicable to the guidance of pistons and piston rings in hydraulic cylinders and air cylinders, playing a role of support and guidance. Its main function is to guide the piston seal to perform a linear sealing movement, preventing the piston from shifting due to uneven external forces received, resulting in internal leakage and reducing the service life of hydraulic seals.

[0032] In the present utility model, a guide sleeve 2 is added on the basis of the original piston body. An annular groove 3 and a first installation groove 4 for installing a sealing ring are provided in the guide sleeve 2, and a second installation groove 5 for installing a dust ring is provided in the piston body 1, thereby increasing the length of the piston body 1 and enhancing the stability and sealing performance when the piston moves.

[0033] The above are only the preferred embodiments of the present utility model. It should be pointed out that for those skilled in the art, without departing from the structure of the present utility model, several deformations and improvements can still be made, and these will not affect the implementation effect of the present utility model and the practicality of the patent.

Claims

1. An improved oil cylinder piston, characterized in that, It includes a piston body (1) and a guide sleeve (2). One end of the piston body (1) is provided with the guide sleeve (2). An annular groove (3) and a first installation groove (4) for installing a sealing ring are formed in the guide sleeve (2). A second installation groove (5) for installing a dust ring is formed in the piston body (1). A piston rod (6) penetrates through the guide sleeve (2) and is inserted into the piston body (1).

2. An improved oil cylinder piston according to claim 1, characterized in that, The piston body (1) and the guide sleeve (2) are of an integral structure.

3. An improved oil cylinder piston according to claim 1, characterized in that, The thickness of the second installation groove (5) is 4 - 6 mm.

4. An improved oil cylinder piston according to claim 1, characterized in that, Third installation grooves (7) are formed on both sides of the piston body (1).

5. An improved oil cylinder piston according to claim 1, characterized in that, The length of the guide sleeve (2) is 15 - 25 mm.

6. An improved oil cylinder piston according to claim 1, characterized in that, The diameter of the guide sleeve (2) is smaller than the diameter of the piston body (1).

7. An improved oil cylinder piston according to claim 1, characterized in that, A limiting protrusion (8) is provided in the piston body (1) on the side of the second installation groove (5) away from the guide sleeve (2).

8. An improved oil cylinder piston according to claim 1, characterized in that, A horn-shaped guide port (9) is installed at the opening at one end of the guide sleeve (2) away from the piston body (1).

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