Oil cylinder and piston mechanism for oil cylinder
By installing a retaining ring on the piston rod and connecting the piston to the connector with a pressure cap, the problem of not being able to machine threads on the piston rod is solved, achieving a stable connection between the piston and the piston rod and simplifying the machining process.
Patent Information
- Application Number
- CN202520177896.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-05
- Publication Date
- 2025-12-09
- Estimated Expiration
- 2035-02-05
AI Technical Summary
When it is impossible to machine threads on the piston rod, existing technologies cannot effectively connect the piston and piston rod.
A pressure cap and a piston are positioned on both sides of the retaining ring, and the pressure cap is connected to the piston through a connector, so that the piston is fastened to the retaining ring, replacing the traditional threaded connection method.
It achieves a stable connection between the piston and piston rod, eliminating the need for threads on the piston rod, simplifying thread processing, and providing a connection without threads on the piston rod. It solves the problem of threaded connections in existing technologies, provides a connection for the piston rod, provides a threadless connection, provides a connection without the need for mating between the piston and piston rod, and provides a connection method that eliminates the need for threads on the piston rod.
Smart Images
Figure CN223648197U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the general hydraulic technology field, specifically relating to a straight cylinder type fluid pressure actuator, and more particularly to a hydraulic cylinder and a piston mechanism for the hydraulic cylinder. Background Technology
[0002] In conventional hydraulic cylinders, the piston and piston rod are usually connected by threads.
[0003] However, in some scenarios where it is impossible to machine threads on the piston rod, the above structure cannot be used.
[0004] Therefore, how to solve the technical problem of connecting the piston and piston rod when it is impossible to machine threads on the piston rod is a problem that urgently needs to be solved by those skilled in the art.
[0005] It should be noted that the information disclosed in this background section is only for understanding the background technology of the present application concept, and therefore, the above description is not considered to constitute prior art information. Utility Model Content
[0006] This disclosure provides at least one hydraulic cylinder and a piston mechanism for the hydraulic cylinder.
[0007] In a first aspect, embodiments of this disclosure provide a hydraulic cylinder, comprising: a cylinder barrel; a piston rod on which at least one retaining ring is sleeved; a piston sleeved on the piston rod and located inside the cylinder barrel; and a pressure cap sleeved on the piston rod and connected to the piston via a connector to secure the piston to the retaining ring.
[0008] In one optional embodiment, the piston includes: a sliding ring portion and a limiting ring portion; the limiting ring portion is located inside the sliding ring portion; the retaining ring is located between the limiting ring portion and the pressure cap; wherein the pressure cap is connected to the sliding ring portion via a connector so that the limiting ring portion of the piston abuts against the retaining ring.
[0009] In one alternative embodiment, at least one first annular groove is formed on the side wall of the piston rod; the retaining ring is disposed in the first annular groove for limiting the movement.
[0010] In one optional embodiment, two retaining rings are used; two first annular grooves are formed on the side wall of the piston rod; the retaining rings are disposed in the corresponding first annular grooves for limiting; wherein, the two first annular grooves are adjusted by changing the spacing to accommodate pistons of different widths.
[0011] In one alternative embodiment, the width L of the empty area inside the sliding ring is smaller than the width H of the area occupied by the two retaining rings.
[0012] In one optional embodiment, the sliding ring portion slides in conjunction with the cylinder barrel, and a first sealing ring is fitted on it to seal the gap between the sliding ring portion and the cylinder barrel; the limiting ring portion has a second annular groove on the side facing the piston rod; a second sealing ring is provided in the second annular groove to seal the gap between the limiting ring portion and the piston rod.
[0013] In one alternative embodiment, a pair of retaining rings are provided in the second annular groove; the two retaining rings are respectively located on both sides of the second sealing ring.
[0014] Secondly, this disclosure also provides a piston mechanism for a hydraulic cylinder, comprising: a piston rod on which a pair of retaining rings are sleeved; a piston sleeved on the piston rod; and a pressure cap sleeved on the piston rod and connected to the piston via a connector to secure the piston to the piston rod.
[0015] In one optional embodiment, the piston includes: a sliding ring portion and a limiting ring portion; the limiting ring portion is located inside the sliding ring portion; the limiting ring portion is located outside a retaining ring, and the pressure cap is located outside another retaining ring; wherein the pressure cap is connected to the sliding ring portion via a connector so that the limiting ring portion abuts against the retaining ring.
[0016] In one optional embodiment, the sidewall of the piston rod has two first annular grooves; the two retaining rings are respectively disposed in the corresponding first annular grooves for limiting; wherein, the two first annular grooves are adapted to pistons of different widths by changing the spacing between them.
[0017] The beneficial effect of this utility model is that the oil cylinder and the piston mechanism of the oil cylinder are achieved by setting the pressure plate and the piston on both sides of the retaining ring and connecting the pressure plate and the piston with a connector, so that the piston is fastened on the retaining ring, thus realizing the mating connection between the piston and the piston rod without the need to open the thread on the piston rod.
[0018] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objectives and other advantages of this invention are realized and obtained through the structures particularly pointed out in the description and the accompanying drawings.
[0019] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings. Attached Figure Description
[0020] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0021] Figure 1 A cross-sectional view of a hydraulic cylinder provided in an embodiment of this disclosure;
[0022] Figure 2 This is a schematic diagram of a structure using two retaining rings provided in an embodiment of the present disclosure;
[0023] Figure 3 This is a schematic diagram of a structure using a retaining ring, provided by an embodiment of the present disclosure;
[0024] Figure 4 This is a schematic diagram of a piston provided in an embodiment of the present disclosure.
[0025] In the picture:
[0026] Cylinder 1;
[0027] Piston rod 2, retaining ring 21, first annular groove 22;
[0028] Piston 3, sliding ring 31, empty area 310, first sealing ring 311, limiting ring 32, second annular groove 321, second sealing ring 322, retaining ring 323;
[0029] 4. Pressure cap; 41. Connector. Detailed Implementation
[0030] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0031] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the figures, the thickness of parts may be exaggerated or reduced for the purpose of effectively depicting the technical content.
[0032] The following detailed description, with reference to the accompanying drawings, describes some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.
[0033] like Figure 1 As shown, at least one embodiment provides a hydraulic cylinder, including: a cylinder barrel 1, a piston rod 2 and a piston 3. The piston 3 is located inside the cylinder barrel 1, the piston rod 2 is connected to the piston 3, and the piston rod 2 is connected to a drive source. The drive source drives the piston rod 2 to move, causing the piston 3 to move accordingly.
[0034] like Figure 2 As shown, in one application scenario, in some implementations, two first annular grooves 22 are formed on the side wall of the piston rod 2, and a retaining ring 21 is provided in each of the two first annular grooves 22. The retaining ring 21 is limited within the first annular groove 22. In order to adapt to pistons 3 of different widths, the distance between the two first annular grooves 22 can be changed.
[0035] like Figure 2 As shown, in some embodiments, the piston 3 is sleeved on the piston rod 2. The piston 3 includes a sliding ring portion 31 and a limiting ring portion 32. In order to fix the piston 3, a pressure cap 4 is sleeved on the piston rod 2, and two retaining rings 21 are positioned between the pressure cap 4 and the limiting ring portion 32. Then, the pressure cap 4 is connected to the sliding ring portion 31 through a connector 41, so that the pressure cap 4 and the limiting ring portion 32 are both pressed against the retaining rings 21, that is, the piston 3 is fixed on the piston rod 2.
[0036] In this embodiment, the pressure cap 4 and piston 3 are connected and fastened together, replacing the threaded connection method in the prior art, so that there is no need to open threads on the piston rod 2.
[0037] In some embodiments, the connector 41 may be, but is not limited to, using screws.
[0038] like Figure 4 As shown, in some embodiments, the width L of the empty area 310 inside the sliding ring 31 is smaller than the width H of the area occupied by the two retaining rings 21.
[0039] In this embodiment, the width L of the empty area 310 is smaller than the width H of the area occupied by the two retaining rings 21, so that when the pressure cap 4 is connected to the sliding ring 31, both the pressure cap 4 and the limiting ring 32 can abut against the retaining ring 21, thereby achieving a fastening effect.
[0040] like Figure 4 As shown, in some embodiments, after the piston 3 is connected to the piston rod 2, the sliding ring portion 31 of the piston 3 slides with the cylinder 1, and a first sealing ring 311 is sleeved on the sliding ring portion 31 to seal the gap between the sliding ring portion 31 and the cylinder 1; wherein, the first sealing ring 311 is disposed in the corresponding mounting groove.
[0041] like Figure 4 As shown, in some embodiments, the limiting ring 32 has a second annular groove 321 on the side facing the piston rod 2, and a second sealing ring 322 is provided in the second annular groove 321 to seal the gap between the limiting ring 32 and the piston rod 2.
[0042] like Figure 4 As shown, in some embodiments, a pair of retaining rings 323 are provided in the second annular groove 321; the two retaining rings 323 are respectively located on both sides of the second sealing ring 322.
[0043] like Figure 3 As shown, in another application scenario, in some implementations, a first annular groove 22 is provided on the side wall of the piston rod 2, and a retaining ring 21 is provided in the first annular groove 22. The retaining ring 21 is limited within the first annular groove 22. In order to adapt to pistons 3 of different widths, retaining rings 21 of different widths can be replaced, and the first annular groove 22 can be opened to a width that matches the retaining ring 21.
[0044] In some embodiments, the piston 3 is sleeved on the piston rod 2. The piston 3 includes a sliding ring portion 31 and a limiting ring portion 32. In order to fix the piston 3, a pressure cap 4 is sleeved on the piston rod 2, so that the pressure cap 4 and the limiting ring portion 32 are respectively located on both sides of the retaining ring 21. Then, the pressure cap 4 is connected to the sliding ring portion 31 through the connector 41, so that the pressure cap 4 and the limiting ring portion 32 are both pressed against the retaining ring 21, that is, the piston 3 is fixed on the piston rod 2.
[0045] At least one embodiment also provides a piston mechanism for a hydraulic cylinder, comprising: a piston rod 2 on which a pair of retaining rings 21 are sleeved; a piston 3 on which the piston rod 2 is sleeved; and a pressure cap 4 on which the piston rod 2 is sleeved and connected to the piston 3 via a connector 41, so that the piston 3 is fastened to the piston rod 2.
[0046] In some embodiments, the piston 3 includes a sliding ring portion 31 and a limiting ring portion 32; the limiting ring portion 32 is located inside the sliding ring portion 31; the limiting ring portion 32 is located outside a retaining ring 21, and the pressure cap 4 is located outside another retaining ring 21; wherein the pressure cap 4 is connected to the sliding ring portion 31 through a connector 41 so that the limiting ring portion 32 abuts against the retaining ring 21.
[0047] In some embodiments, the sidewall of the piston rod 2 has two first annular grooves 22; two retaining rings 21 are respectively disposed in the corresponding first annular grooves 22 for limiting; wherein, the two first annular grooves 22 are adapted to pistons 3 of different widths by changing the spacing between them.
[0048] In summary, this hydraulic cylinder and its piston mechanism achieve the mating connection between the piston 3 and the piston rod 2 by placing the pressure cap 4 and the piston 3 on both sides of the retaining ring 21 and connecting the pressure cap 4 and the piston 3 with the connecting piece 41, thus securing the piston 3 to the retaining ring 21 without the need to open threads on the piston rod 2.
[0049] In this document, when it is said that the first component is located on the second component, this can mean that the first component can be directly formed on the second component, or that the third component can be inserted between the first component and the second component.
[0050] In this document, when an element or layer is referred to as “located,” “joined to,” “connected to,” “attached to,” or “coupled to” another element or layer, it may be directly located, joined, connected, attached to, or coupled to the other element or layer, or there may be intermediate elements or layers present. Conversely, when an element is referred to as “directly on another element or layer,” “directly joined to,” “directly connected to,” “directly attached to,” or “directly coupled to” another element or layer, there may be no intermediate elements or layers present. Other terms used to describe relationships between elements should be interpreted in a similar manner (e.g., “between” versus “directly between,” “adjacent” versus “directly adjacent,” etc.). As used herein, the term “and / or” includes any and all combinations of one or more of the related listed items.
[0051] In this document, exemplary embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. As used herein, expressions such as “at least one of…” modify the entire list of elements when following a list of elements, rather than individual elements in the list. For example, the expression “at least one of a, b, and c” should be understood to include only a, only b, only c, both a and b, both a and c, both b and c, or all of a, b, and c.
[0052] The terminology used herein is for the purpose of describing specific exemplary configurations only and is not intended to be limiting. As used herein, the singular articles “a,” “an,” and “the” may also be intended to include plural forms unless otherwise clearly stated herein. The terms “comprising,” “including,” and “having” are inclusive and thus specify the presence of features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein should not be construed as requiring them to be performed in the specific order discussed or shown, unless specifically identified as such. Additional or alternative steps may be employed.
[0053] As used herein, the phrases “in one embodiment,” “according to one embodiment,” “in some embodiments,” etc., generally refer to the fact that a particular feature, structure, or characteristic following the phrase can be included in at least one embodiment of this disclosure. Therefore, a particular feature, structure, or characteristic can be included in more than one embodiment of this disclosure, such that these phrases do not necessarily refer to the same embodiment. As used herein, the terms “example,” “exemplary,” etc., are used to “serve as an example, instance, or illustration.” Any implementation, aspect, or design described herein as “example” or “exemplary” is not necessarily to be construed as preferred or superior to other implementations, aspects, or designs. Rather, the use of the terms “example,” “exemplary,” etc., is intended to present concepts in a specific manner.
[0054] In the description of the embodiments of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0055] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence unless expressly indicated herein. Therefore, without departing from the teachings of the exemplary embodiments, the first element, component, region, layer, or segment discussed above may be referred to as the second element, component, region, layer, or segment.
[0056] Spatially relative terms, such as “inside,” “outside,” “below,” “below,” “down,” “above,” “up,” etc., may be used herein to describe the relationship between one element or feature illustrated in the figures and another element or feature. In addition to the orientations depicted in the figures, spatially relative terms may be intended to cover different orientations of the device in use or operation. For example, if the device in the figure is flipped, an element described as “below” or “below” other elements or features would be oriented as “above” other elements or features. Thus, the example term “below” can cover both above and below orientations. The device may be oriented in other ways (rotated 90 degrees or in other orientations), and the spatially relative descriptors used herein are interpreted accordingly.
[0057] In the above discussion, unless otherwise stated, when used to describe numerical values, the terms “about,” “approximately,” “basically,” etc., indicate a change of + / - 10% in that value.
[0058] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.
Claims
1. A hydraulic cylinder, characterized in that, include: Cylinder (1); The piston rod (2) is fitted with at least one retaining ring (21). The piston (3) is fitted onto the piston rod (2) and located inside the cylinder (1); The pressure cap (4) is fitted onto the piston rod (2) and connected to the piston (3) via the connector (41) so that the piston (3) is fastened to the retaining ring (21).
2. The hydraulic cylinder as described in claim 1, characterized in that, The piston (3) includes: a sliding ring (31) and a limiting ring (32). The limiting ring (32) is located inside the sliding ring (31); The retaining ring (21) is located between the limiting ring (32) and the pressure cap (4); The pressure cap (4) is connected to the sliding ring (31) via a connector (41) so that the limiting ring (32) of the piston (3) abuts against the retaining ring (21).
3. The hydraulic cylinder as described in claim 2, characterized in that, At least one first annular groove (22) is provided on the side wall of the piston rod (2); The retaining ring (21) is disposed in the first annular groove (22) for limiting.
4. The hydraulic cylinder as described in claim 2, characterized in that, The number of the retaining rings (21) is two; Two first annular grooves (22) are provided on the side wall of the piston rod (2); The retaining ring (21) is disposed in the corresponding first annular groove (22) for limiting the position; The first annular grooves (22) are adapted to pistons (3) of different widths by changing their spacing.
5. The hydraulic cylinder as described in claim 4, characterized in that, The width L of the empty area (310) inside the sliding ring (31) is smaller than the width H of the area occupied by the two retaining rings (21).
6. The hydraulic cylinder as described in claim 2, characterized in that, The sliding ring (31) is slidably engaged with the cylinder (1), and a first sealing ring (311) is fitted on it to seal the gap between the sliding ring (31) and the cylinder (1); The limiting ring (32) has a second annular groove (321) on the side facing the piston rod (2). A second sealing ring (322) is provided in the second annular groove (321) to seal the gap between the limiting ring (32) and the piston rod (2).
7. The hydraulic cylinder as described in claim 6, characterized in that, A pair of retaining rings (323) are provided in the second annular groove (321); The two retaining rings (323) are located on both sides of the second sealing ring (322).
8. A piston mechanism for a hydraulic cylinder, characterized in that, include: Piston rod (2), on which a pair of retaining rings (21) are fitted; Piston (3) is fitted onto piston rod (2); The pressure cap (4) is fitted onto the piston rod (2) and connected to the piston (3) via the connector (41) so that the piston (3) is fastened to the piston rod (2).
9. The piston mechanism for a hydraulic cylinder as described in claim 8, characterized in that, The piston (3) includes: a sliding ring (31) and a limiting ring (32). The limiting ring (32) is located inside the sliding ring (31); The limiting ring (32) is located outside one retaining ring (21), and the pressure cap (4) is located outside the other retaining ring (21); The pressure cap (4) is connected to the sliding ring (31) via a connector (41) so that the limiting ring (32) abuts against the retaining ring (21).
10. The piston mechanism for a hydraulic cylinder as described in claim 9, characterized in that, The piston rod (2) has two first annular grooves (22) on its side wall; The two retaining rings (21) are respectively disposed in the corresponding first annular grooves (22) for limiting their position; The first annular grooves (22) are adapted to pistons (3) of different widths by changing their spacing.