Hydraulic cylinder

Abstract

The utility model belongs to the technical field of fluid pressure executing mechanisms, and provides a hydraulic cylinder. The hydraulic cylinder comprises a cylinder barrel which is provided with an opening and a piston cavity; the piston has a limiting part; the spring structure is assembled on the inner circumferential wall of the piston cavity in a clearance fit mode. The spring structure is formed by stacking belleville spring piece groups; the sealing cover is connected to the piston cavity; due to the fact that the piston in the hydraulic cylinder is in clearance fit with the peripheral wall of the inner side of the cylinder barrel, and the cylinder barrel is detachably connected to the opening of the cylinder barrel, obviously, a spring structure which is located in a piston cavity of the piston and located between the piston and the end, away from the opening, of the cylinder barrel is detachable. Therefore, the output force of the spring structure can be adjusted to the required output force by increasing or decreasing the number of any one or more of the folding combined type belleville spring piece groups, the overlapping combined type belleville spring piece groups and the composite combined type belleville spring piece groups, pressure springs do not need to be specially customized, and time and labor are saved.

Description

Technical Field

[0001] This utility model belongs to the technical field of fluid pressure actuators, specifically, it relates to a hydraulic cylinder. Background Technology

[0002] Hydraulic cylinders, as the core actuators in hydraulic systems, are widely used in fields such as engineering machinery, aerospace, shipbuilding, and metallurgical equipment.

[0003] Reference application number "CN20211266322.2" and patent name "A Compression Spring Assembly for Hydraulic Equipment" discloses that the hydraulic cylinder can obtain different hydraulic cylinder clamping forces under the same oil pressure by adjusting the rectangular spring mechanism. However, the compression spring (or spring mechanism) in the existing hydraulic cylinder usually needs to be specially customized according to the required output force, which is not only time-consuming and laborious, but also has high manufacturing costs.

[0004] Therefore, there is an urgent need to invent a hydraulic cylinder to solve the aforementioned technical problems. Summary of the Invention

[0005] The technical problem to be solved by this utility model is how to design a spring structure suitable for hydraulic cylinders and whose output force can be adjusted. In view of the above problem, a hydraulic cylinder is provided.

[0006] The technical solution of this utility model to solve the above-mentioned technical problems is to provide a hydraulic cylinder, which includes:

[0007] A cylinder having a piston chamber, wherein the piston chamber has an opening at one end of the cylinder;

[0008] A piston is located within the piston chamber and is slidably sealed to the inner peripheral wall of the piston chamber; the piston has a limiting portion;

[0009] A spring structure is located between the end of the cylinder away from the opening and the piston, and is fitted with the inner peripheral wall of the piston cavity with a clearance fit; the spring structure is at least partially sleeved on the limiting part and is clearance-fitted with the limiting part; the spring structure is formed by stacking multiple sets of disc spring plates along the axial direction; each set of disc spring plates includes any one or more of the following combinations: the mating combination disc spring plate group, the overlapping combination disc spring plate group, or the composite combination disc spring plate group;

[0010] A sealing cap is detachably attached to the inner peripheral wall of the piston chamber and seals the opening.

[0011] In one specific embodiment, both the paired combined disc spring sheet group and the stacked combined disc spring sheet group include two single disc spring sheets; the composite combined disc spring sheet group is composed of two groups of the stacked combined disc spring sheet groups arranged opposite to each other;

[0012] The paired combination disc spring group is composed of two opposing disc spring pieces; the stacked combination disc spring group is composed of two stacked disc spring pieces.

[0013] In one specific embodiment, the spring structure is formed by stacking multiple sets of the mating combined disc spring sheets together.

[0014] In one specific embodiment, the disc spring has a first surface and a second surface opposite to the first surface on both sides;

[0015] In the combination of disc spring sheets, the first surface of one disc spring sheet is attached to the first surface of the other disc spring sheet.

[0016] In one specific embodiment, a piston rod is also included;

[0017] The sealing cap has a through hole, and the piston rod passes through the through hole and is threaded onto the piston; a wear-resistant element is provided between the hole wall of the through hole and the peripheral side wall of the piston rod.

[0018] In one specific embodiment, the centerline of the spring structure, the axis of the piston, and the axis of the piston rod coincide with each other.

[0019] In one specific embodiment, the limiting part is provided with a mounting hole, and the hydraulic cylinder is assembled onto the engineering vehicle by means of a threaded rod passing through the cylinder barrel through the spring structure and then being inserted into the mounting hole.

[0020] Preferably, a second wear-resistant element is further provided between the outer peripheral sidewall of the piston and the inner peripheral sidewall of the piston cavity.

[0021] Preferably, a sealing element is provided between the outer peripheral sidewall of the piston and the inner peripheral sidewall of the piston cavity.

[0022] The beneficial effects are as follows: Since the piston clearance fits onto the inner circumferential wall of the cylinder, and the sealing cap can be detachably connected to the cylinder opening, the spring structure located within the piston chamber of the cylinder and between the piston and the cylinder end furthest from the opening is clearly detachable relative to the cylinder. Therefore, by increasing or decreasing the number of any one or more disc spring groups among the paired, stacked, and composite disc spring groups, the output force of the spring structure can be adjusted to the required output force without the need for custom-made compression springs, saving time and effort. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of a hydraulic cylinder in one embodiment of the present invention;

[0024] Figure 2 This is a diagram showing the state changes of a hydraulic cylinder in one embodiment of this utility model;

[0025] Figure 3 This is a schematic diagram of the structure of the combined disc spring sheet grouping in one embodiment of the present invention;

[0026] Figure 4 This is a schematic diagram of the structure of the stacked and combined disc spring sheet grouping in one embodiment of this utility model;

[0027] Figure 5 This is a schematic diagram of the structure of the combined disc spring sheet grouping in one embodiment of the present invention;

[0028] Figure 6 This is a schematic diagram of the structure of a single disc spring in one embodiment of this utility model.

[0029] Reference numerals: 1. Hydraulic cylinder; 10. Cylinder barrel; 100. Piston chamber; 101. Opening; 11. Piston; 110. Limiting part; 1100. Mounting hole;

[0030] 12. Spring structure; 120. Disc spring assembly; 1200. Adjoint disc spring group; 1201. Stacked disc spring group; 1202. Composite disc spring group; 1203. Single disc spring; 1203a. First surface; 1203b. Second surface;

[0031] 13. Sealing cap; 130. Through hole; 14. Piston rod; 15. First wear-resistant element; 16. Second wear-resistant element; 17. Sealing element. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0033] refer to Figure 1 and Figure 2 This utility model provides a hydraulic cylinder 1 as one of the actuators in the brake of an engineering vehicle.

[0034] The hydraulic cylinder 1 includes a cylinder barrel 10 with an opening 101, a piston 11 and a spring structure 12 assembled inside the cylinder barrel 10, and a sealing cap 13 covering the opening 101 of the cylinder barrel 10. Hydraulic oil entering the cylinder barrel 10 through the oil inlet pushes the piston 11 to compress the spring structure 12. The spring structure 12 is compressed and accumulates elastic force until the end face of the piston 11 presses against the cavity wall of the end of the cylinder barrel 10 away from the opening 101. At this time, the spring structure 12 is in a compressed state. Subsequently, during the return process of the spring structure 12, the piston 11 moves linearly under the push of the elastic force of the spring structure 1 and outputs force, thereby converting hydraulic energy into mechanical energy in the hydraulic cylinder 1.

[0035] The cylinder 10 has an opening 101 at one end and is sealed at the other end. A piston chamber 100 is formed inside the cylinder 10 (it should be noted that the piston chamber 100 has an opening 101 at one end of the cylinder 10). The piston 11 is located inside the piston chamber 100 and is slidably sealed to the inner peripheral wall of the piston chamber 100. Specifically, the piston 11 has a limiting part 110. When the piston 11 compresses the spring structure 12 or the spring structure 12 pushes the piston 11 under the action of elastic force, the limiting part 110 restricts the inner edge of the spring structure 12 (see below for details).

[0036] The spring structure 12 is located between the end of the cylinder 10 away from the opening 101 and the piston 11, and is fitted with a clearance fit on the inner peripheral wall of the piston cavity 100 to limit the outer edge of the spring structure 12. The spring structure 12 is at least partially sleeved on the limiting portion 110, and the inner edge of the spring structure 12 is in clearance fit with the outer peripheral side of the limiting portion 110. When the piston 11 is pushed by hydraulic oil to compress the spring structure 12, or when the elastic force accumulated in the spring structure 12 pushes the piston 11 in the opposite direction, the limiting portion 110 reciprocates linearly within the central hole of the spring structure 12. It can be understood that when the spring structure 12 is compressed by the piston 11, the outer diameter or radius of the spring structure 12 increases, while the radius or diameter within the coil of the spring structure 12 decreases. Therefore, the dimension (e.g., diameter or radius) within the coil of the spring structure 12 is slightly larger than the dimension (e.g., diameter or radius) of the limiting portion 110.

[0037] refer to Figures 3-6The spring structure 12 is formed by stacking multiple disc spring groups 120 along the axial direction; wherein, the disc spring group 120 includes a mating combination disc spring group 1200, a stacked combination disc spring group 1120 and a composite combination disc spring group 1202; each disc spring group 120 includes any one or more of the following combinations: mating combination disc spring group 1200, stacked combination disc spring group 1120 or composite combination disc spring group 1202. For example, the spring structure 12 can be at least one set of paired combined disc springs, or at least one set of stacked combined disc springs, or at least one set of composite combined disc springs, or at least one set of paired combined disc springs combined with at least one set of stacked combined disc springs, or at least one set of paired combined disc springs combined with at least one set of composite combined disc springs, or at least one set of stacked combined disc springs combined with at least one set of composite combined disc springs, or at least one set of paired combined disc springs, at least one set of stacked combined disc springs combined with at least one set of composite combined disc springs combined with each other.

[0038] The sealing cover 13 is detachably connected to the inner peripheral wall of the piston chamber 100 and seals the opening 101. In summary, both the sealing cover 13 and the piston 11 in the hydraulic cylinder 1 can be detached from the cylinder barrel 10. Therefore, by increasing or decreasing the number of any one or more disc spring groups 120 among the paired combined disc spring groups 1200, the stacked combined disc spring groups 1120, and the composite combined disc spring groups 1202, the output force of the spring structure 12 can be adjusted to the required output force. For example, the spring structure 12 can be designed according to the required output force using the formula in the following link: (http: / / dev.inkcad.com / WebCalculate / ZhuanYeJiSuan / DieXingTanHuang.aspx). The hydraulic cylinder 1 using the aforementioned spring structure 12 is not only compact but also allows for adjustment of the output force of the spring structure 12 to the required output force by changing the number and / or type of disc spring groups 120, eliminating the need for custom-made compression springs and saving time and effort.

[0039] In one specific embodiment, both the mating combined disc spring group 1200 and the stacked combined disc spring group 1120 include two individual disc spring pieces 1203; the composite combined disc spring group 1202 is composed of two stacked combined disc spring groups 1120 arranged opposite each other. Specifically, the mating combined disc spring group 1200 is composed of two individual disc spring pieces 1203 arranged opposite each other; the stacked combined disc spring group 1120 is composed of two individual disc spring pieces 1203 stacked together. It should be noted that, preferably, when the two stacked combined disc spring groups 1120 of the composite combined disc spring group 1202 are arranged opposite each other, the first surface 1203a of one stacked combined disc spring group 1120 is in contact with the first surface 1203a of the other stacked combined disc spring group 1120.

[0040] In this specific embodiment, the spring structure 12 can be formed by stacking multiple sets of mating, combined disc spring groups 1200. Of course, referring to the above, in other specific embodiments, the spring structure 12 can also be formed by stacking one or more of the above-described combinations of disc spring groups 120.

[0041] In this specific embodiment, preferably, the disc spring single piece 1203 has a first surface 1203a and a second surface 1203b opposite to the first surface 1203a on both sides, and the first surface 1203a of one disc spring single piece 1203 in the combined disc spring single piece group 1200 is in contact with the first surface 1203a of the other disc spring single piece 1203.

[0042] In one specific embodiment, a piston rod 14 is also included; the sealing cap 13 has a through hole 130 extending axially, and the piston rod 14 passes through the through hole 130 and is threaded onto the piston 11. A first wear-resistant element 15 is provided between the wall of the through hole 130 and the peripheral sidewall of the piston rod 14 to ensure that the piston rod 14 runs smoothly following the piston 11. Specifically, the first wear-resistant element 15 can be a wear ring.

[0043] In one specific embodiment, referring to the foregoing, in order to prevent the centerline of the spring structure 12 from deviating about the axis of the piston 11, when the piston 11 squeezes the spring structure 12 or the spring structure 12 pushes the piston 11 under the action of elastic force, the limiting part 110 restricts the inner edge of the spring structure 12, while the peripheral sidewall of the cylinder 10 restricts the outer edge of the spring structure 12. Therefore, the centerline of the spring structure 12, the axis of the piston 11, and the axis of the piston rod 14 coincide with each other.

[0044] In one specific embodiment, for example, the limiting part 110 is provided with a mounting hole 1100, and the hydraulic cylinder 1 is assembled onto the engineering vehicle by means of a threaded rod passing through the cylinder barrel 10 and the spring structure 12 and then being inserted into the mounting hole 1100. It should be noted that the aforementioned application scenario is only one of the application scenarios of the hydraulic cylinder 1 and is not intended to limit the application scenarios of the hydraulic cylinder 1.

[0045] Preferably, in order to ensure that the piston 11 runs smoothly in the piston cavity 100, a second wear-resistant element 16 is provided between the outer peripheral sidewall of the piston 11 and the inner peripheral sidewall of the piston cavity 100. Obviously, the second wear-resistant element 16 can also be a wear-resistant ring.

[0046] Preferably, in order to create a high-pressure environment for the hydraulic oil in the piston chamber 100, a sealing element 17 is provided between the outer peripheral sidewall of the piston 11 and the inner peripheral sidewall of the piston chamber 100.

[0047] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the scope of protection of this utility model. Therefore, the scope of protection of this utility model should be determined by the scope of the claims.

Claims

1. A hydraulic cylinder, characterized in that, include: The cylinder (10) has a piston chamber (100), and the piston chamber (100) has an opening (101) at one end of the cylinder (10). A piston (11) is located inside the piston chamber (100) and is slidably sealed on the inner peripheral wall of the piston chamber (100); the piston (11) has a limiting portion (110). A spring structure (12) is located between the end of the cylinder (10) away from the opening (101) and the piston (11), and is fitted with the inner peripheral wall of the piston cavity (100) with a clearance; the spring structure (12) is at least partially sleeved on the limiting part (110) and is in clearance fit with the limiting part (110); the spring structure (12) is formed by stacking multiple sets of disc spring plates (120) along the axial direction; each set of disc spring plates (120) includes any one or more of the following combinations: mating combination disc spring plate group (1200), overlapping combination disc spring plate group (1201), or composite combination disc spring plate group (1202); A sealing cap (13) is detachably connected to the inner peripheral wall of the piston chamber (100) and blocks the opening (101).

2. The hydraulic cylinder as described in claim 1, characterized in that, Both the combined disc spring group (1200) and the stacked disc spring group (1201) include two individual disc springs (1203). The paired combination disc spring group (1200) is composed of two disc spring pieces (1203) arranged opposite to each other; the stacked combination disc spring group (1201) is composed of two disc spring pieces (1203) stacked together. The composite combined disc spring sheet group (1202) is composed of two sets of overlapping combined disc spring sheet groups (1201) arranged opposite to each other.

3. The hydraulic cylinder as described in claim 2, characterized in that, The spring structure (12) is formed by stacking multiple sets of the combined disc spring groups (1200).

4. The hydraulic cylinder as described in claim 3, characterized in that, The disc spring single piece (1203) has a first surface and a second surface (1203b) opposite to the first surface (1203a) on both sides. In the combined disc spring sheet group (1200), the first surface (1203a) of one disc spring sheet (1203) is attached to the first surface (1203a) of the other disc spring sheet (1203).

5. The hydraulic cylinder as described in claim 4, characterized in that, It also includes the piston rod (14); The sealing cap (13) has a through hole (130), and the piston rod (14) passes through the through hole (130) and is threaded to the piston (11); a wear-resistant element is provided between the hole wall of the through hole (130) and the peripheral side wall of the piston rod (11).

6. The hydraulic cylinder as described in claim 5, characterized in that, A second wear-resistant element (16) is provided between the outer peripheral sidewall of the piston (11) and the inner peripheral sidewall of the piston cavity (100).

7. The hydraulic cylinder as described in claim 6, characterized in that, A sealing element (17) is also provided between the outer peripheral sidewall of the piston (11) and the inner peripheral sidewall of the piston cavity (100).

8. The hydraulic cylinder according to any one of claims 1-7, characterized in that, The centerline of the spring structure (12), the axis of the piston (11), and the axis of the piston rod (11) coincide with each other.

9. The hydraulic cylinder according to any one of claims 1-7, characterized in that, The limiting part (110) is provided with a mounting hole (1100), and the hydraulic cylinder (1) is assembled onto the engineering vehicle by means of a threaded rod passing through the cylinder barrel (10) through the spring structure (12) and being inserted into the mounting hole (1100).

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