Hydraulic oil cylinder

Abstract

The utility model discloses a hydraulic oil cylinder in the technical field of hydraulic pressure. The hydraulic oil cylinder comprises a cylinder body. The cylinder body is of a hollow round pipe structure, a front end cover and a rear end cover are pressed at the left end and the right end of the cylinder body respectively, and a second steel cable baffle ring and a first steel cable baffle ring are clamped between the front end cover and the inner wall of the cylinder body and between the rear end cover and the inner wall of the cylinder body respectively. A disc spring guide rod is installed in the middle of the rear end cover, and a disc spring is arranged on the disc spring guide rod. A mounting hole is formed in the center of the front end cover, a piston is mounted in the mounting hole, and a movable rod is mounted in the middle of the piston. A first sealing structure is arranged between the piston and the front end cover mounting hole, and a second sealing structure is arranged between the piston and the inner wall of the cylinder body. An oil injection hole is formed in one side of the cylinder body and communicated with a cavity between the front end cover and the piston. The connecting mode of the cylinder body of the hollow round pipe structure and the steel cable baffle ring is adopted, the manufacturing difficulty and cost are reduced, and the sealing performance is improved.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic technology, and in particular to a hydraulic cylinder. Background Technology

[0002] Hydraulic cylinders are key components in industrial brakes. Currently, existing hydraulic cylinders used in brakes suffer from unreasonable structural design. For example, the cylinder body is usually a one-piece structure, which makes the manufacturing process complex and difficult, significantly increasing the production and operating costs of the brake, thus raising the product price and making it less competitive in the market. Utility Model Content

[0003] The main objective of this invention is to provide a hydraulic cylinder to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] A hydraulic cylinder includes a cylinder body. The cylinder body is a hollow cylindrical tube structure. A front end cover and a rear end cover are press-fitted to the left and right ends of the cylinder body, respectively. A second wire retaining ring and a first wire retaining ring are respectively clamped between the front end cover and the inner wall of the cylinder body. A disc spring guide rod is centrally mounted on the rear end cover, and a disc spring is mounted on the disc spring guide rod. A mounting hole is opened in the center of the front end cover, and a piston is installed in the mounting hole. A movable rod is installed in the middle of the piston. A first sealing structure is provided between the piston and the mounting hole of the front end cover, and a second sealing structure is provided between the piston and the inner wall of the cylinder body. An oil injection hole is opened on one side of the cylinder body, and the oil injection hole communicates with the cavity between the front end cover and the piston.

[0006] Furthermore, the first sealing structure includes a dustproof ring, a first U-shaped seal, a first guide belt, and a first step seal installed at intervals from left to right, and an annular groove that mates with each sealing element of the first sealing structure is provided on the inner side of the front cover.

[0007] Furthermore, the second sealing structure includes a second step seal, a second guide band, and a second U-shaped seal installed at intervals from left to right, and an annular groove is provided on the inner wall of the cylinder to cooperate with each sealing element of the second sealing structure.

[0008] Furthermore, mounting grooves are provided on the sides of both the front and rear covers, and slots that mate with the mounting grooves are provided on the cylinder opening. A second wire retaining ring and a first wire retaining ring are installed in the mounting groove and slot on the same side, respectively.

[0009] Furthermore, a rear connector is installed on the right side of the rear end cover, and a connection hole is opened in the rear connector, in which a self-lubricating bushing is installed.

[0010] Furthermore, a screw plug is installed in the oil filling hole, and a combined sealing gasket is provided below the screw plug. An O-ring is installed between the side of the front cover and the inner wall of the cylinder.

[0011] This invention also includes other components that enable the hydraulic cylinder to function properly, and these devices or components all employ conventional techniques in the art. Furthermore, devices and components not limited in this invention all employ conventional techniques in the art, such as the disc spring mentioned in this application. In specific implementation, appropriate equipment or component models can be selected according to the specific working scenario.

[0012] The working principle of this utility model is as follows: The cylinder body of the hydraulic cylinder adopts a simple hollow circular tube structure. Its left and right ends are fitted with mounting grooves and retaining grooves, and the front and rear covers are press-fitted onto both ends of the cylinder body using a first and a second wire retaining ring, effectively reducing manufacturing difficulty. When hydraulic oil is injected through the oil injection hole, the piston moves the movable rod under hydraulic pressure, achieving the braking function. Simultaneously, the first sealing structure (including a dust seal, a first U-shaped seal, a first guide band, and a first step seal) and the second sealing structure (including a second step seal, a second guide band, and a second U-shaped seal) cooperate to ensure good sealing of the hydraulic cylinder during operation, preventing hydraulic oil leakage and ensuring the normal operation of the braking system.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. Reduce manufacturing difficulty: The cylinder body with a hollow round tube structure and the connection method of the steel wire retaining ring simplify the processing technology and reduce the production technical requirements.

[0015] 2. Reduce costs: Optimize the structure to reduce the production and use costs of brakes and enhance market competitiveness.

[0016] 3. Improved sealing performance: The multi-layer sealing structure design enhances the sealing effect, prevents hydraulic oil leakage, and ensures stable operation of the braking system. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the external structure of this utility model.

[0018] Figure 2 For along Figure 1 Sectional view of AA.

[0019] Figure 3 for Figure 2 Enlarged view of section B in the middle.

[0020] In the diagram: 1. Rear connector; 2. Self-lubricating bushing; 3. Rear end cover; 31. Mounting groove; 4. Disc spring guide rod; 5. First wire retaining ring; 6. Cylinder body; 61. Slot; 7. Disc spring; 8. Piston; 9. Combined sealing gasket; 10. Plug; 11. Front end cover; 12. Second wire retaining ring; 13. Movable rod; 14. Dustproof ring; 15. First U-shaped seal; 16. O-ring; 17. First guide belt; 18. First step seal; 19. Second step seal; 20. Second guide belt; 21. Second U-shaped seal. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0022] Example:

[0023] like Figures 1-3 As shown, a hydraulic cylinder includes a cylinder body 6. The cylinder body 6 is a hollow cylindrical tube structure. A front end cover 11 and a rear end cover 3 are press-fitted to the left and right ends of the cylinder body 6, respectively. A second wire retaining ring 12 and a first wire retaining ring 5 are respectively clamped between the front end cover 11 and the rear end cover 3 and the inner wall of the cylinder body 6. A disc spring guide rod 4 is centrally mounted on the rear end cover 3, and a disc spring 7 is mounted on the disc spring guide rod 4. A mounting hole is opened in the center of the front end cover 11, and a piston 8 is installed in the mounting hole. A movable rod 13 is installed in the middle of the piston 8. A first sealing structure is provided between the piston 8 and the mounting hole of the front end cover 11, and a second sealing structure is provided between the piston 8 and the inner wall of the cylinder body 6. An oil injection hole is opened on one side of the cylinder body 6, and the oil injection hole communicates with the cavity between the front end cover 11 and the piston 8.

[0024] Specifically, the first sealing structure includes a dustproof ring 14, a first U-shaped seal 15, a first guide band 17, and a first step seal 18, installed at intervals from left to right. An annular groove is provided on the inner side of the front cover 11 to mate with each sealing element of the first sealing structure. The second sealing structure includes a second step seal 19, a second guide band 20, and a second U-shaped seal 21, installed at intervals from left to right. An annular groove is provided on the inner wall of the cylinder body 6 to mate with each sealing element of the second sealing structure.

[0025] In addition, mounting grooves 31 are provided on the sides of both the front cover 11 and the rear cover 3. The cylinder 6 port is provided with slots 61 that mate with the mounting grooves 31. A second wire retaining ring 12 and a first wire retaining ring 5 are respectively installed in the mounting groove 31 and slot 61 on the same side. A screw plug 10 is installed in the oil filling hole, and a combined sealing gasket 9 is located below the screw plug 10. An O-ring 16 is installed between the side of the front cover 11 and the inner wall of the cylinder 6. A rear connector 1 is installed on the right side of the rear cover 3. A connection hole is provided in the rear connector 1, and a self-lubricating bushing 2 is installed in the connection hole.

[0026] The working principle of this hydraulic cylinder is as follows: The cylinder body 6 adopts a simple hollow circular tube structure. Its left and right ends are fitted with mounting grooves 31 and locking grooves 61, and the front end cover 11 and rear end cover 3 are press-fitted onto both ends of the cylinder body 6 with the help of the first wire retaining ring 5 and the second wire retaining ring 12, effectively reducing manufacturing difficulty. When hydraulic oil is injected through the oil injection hole, the piston 8 moves the movable rod 13 under hydraulic pressure, realizing the braking function. Simultaneously, the first sealing structure (including a dust seal 14, a first U-shaped seal 15, a first guide band 17, and a first step seal 18) and the second sealing structure (including a second step seal 19, a second guide band 20, and a second U-shaped seal 21) cooperate to ensure good sealing of the hydraulic cylinder during operation, preventing hydraulic oil leakage and ensuring the normal operation of the braking system.

[0027] The above embodiments are merely descriptions of preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope of the present utility model.

Claims

1. A hydraulic cylinder, comprising a cylinder body (6), characterized in that: The cylinder body (6) is a hollow cylindrical tube structure. A front end cap (11) and a rear end cap (3) are press-fitted onto the left and right ends of the cylinder body (6), respectively. A second wire retaining ring (12) and a first wire retaining ring (5) are respectively clamped between the front end cap (11) and the rear end cap (3) and the inner wall of the cylinder body (6). A disc spring guide rod (4) is installed in the center of the rear end cap (3), and a disc spring (7) is provided on the disc spring guide rod (4). An installation hole is opened in the center of the front end cap (11), and a piston (8) is installed in the installation hole. A movable rod (13) is installed in the middle of the piston (8). A first sealing structure is provided between the piston (8) and the installation hole of the front end cap (11), and a second sealing structure is provided between the piston (8) and the inner wall of the cylinder body (6). An oil injection hole is opened on one side of the cylinder body (6), and the oil injection hole is connected to the cavity between the front end cap (11) and the piston (8).

2. The hydraulic cylinder according to claim 1, characterized in that: The first sealing structure includes a dustproof ring (14), a first U-shaped seal (15), a first guide strip (17), and a first step seal (18) installed at intervals from left to right. The inner side of the front cover (11) is provided with an annular groove that cooperates with each sealing element of the first sealing structure.

3. The hydraulic cylinder according to claim 1, characterized in that: The second sealing structure includes a second step seal (19), a second guide band (20), and a second U-shaped seal (21) installed at intervals from left to right. The inner wall of the cylinder (6) is provided with an annular groove that mates with each sealing element of the second sealing structure.

4. The hydraulic cylinder according to claim 1, characterized in that: The front end cover (11) and the rear end cover (3) are provided with mounting grooves (31) on their sides. The cylinder body (6) opening is provided with slots (61) that cooperate with the mounting grooves (31). The second wire retaining ring (12) and the first wire retaining ring (5) are installed in the mounting groove (31) and the slot (61) on the same side, respectively.

5. The hydraulic cylinder according to claim 1, characterized in that: A rear connector (1) is installed on the right side of the rear end cover (3). A connection hole is provided in the rear connector (1), and a self-lubricating bushing (2) is installed in the connection hole.

6. The hydraulic cylinder according to claim 1, characterized in that: A screw plug (10) is installed in the oil injection hole, and a combined sealing gasket (9) is provided below the screw plug (10); an O-ring (16) is installed between the side of the front cover (11) and the inner wall of the cylinder (6).

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