Piston rod anti-rotation structure and hydraulic cylinder with same

Abstract

The utility model belongs to the technical field of hydraulic pressure, and particularly relates to a piston rod anti-rotation structure and a hydraulic cylinder with the piston rod anti-rotation structure. The piston rod is arranged in the cylinder body; the end cover is connected with the cylinder body, a mounting through hole is formed in the end cover in the axial direction, and a flat key notch is formed in the inner wall of the mounting through hole; the rod head is arranged in the mounting through hole in a sliding mode and connected with the piston rod, and a kidney-shaped groove is formed in the side wall of the rod head; according to the hydraulic cylinder with the piston rod anti-rotation structure, the rod head is limited, so that the piston rod does not rotate, specifically, the flat key is installed in the kidney-shaped groove of the rod head, the piston rod is prevented from rotating, and the piston rod is prevented from rotating. And the flat key protruding out of the kidney-shaped groove is matched with the flat key notch of the mounting through hole, so that the flat key can only move along the flat key notch in the process of reciprocating along with the rod head.

Description

Technical Field

[0001] This utility model belongs to the field of hydraulic technology, specifically relating to a piston rod anti-rotation structure and a hydraulic cylinder having the same. Background Technology

[0002] Hydraulic cylinders, as hydraulic actuators, are widely used in various industries. During normal operation, the piston rod of a hydraulic cylinder will rotate to some extent due to external forces or the cylinder itself. However, in some applications, piston rod rotation is unacceptable because it will cause the equipment frame to rotate, leading to equipment malfunction.

[0003] To solve the problem of piston rod rotation, related technologies generally employ an "external anti-rotation linkage." This involves designing a linkage on the piston rod, with one end fixed to the piston rod and the other end connected to the "client frame" or "external structural components of the hydraulic cylinder" for limiting movement, thereby achieving the anti-rotation effect.

[0004] However, the above structure requires a lot of external space, and the piston rod is generally directly connected to the "client frame", so the piston rod itself does not have much space to be fixed to the "external anti-rotation linkage".

[0005] Therefore, how to avoid the technical problems that the existing "external anti-rotation linkage" not only occupies the external space of the hydraulic cylinder, but also affects the external connection structure of the piston rod is a problem that urgently needs to be solved by those skilled in the art.

[0006] 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

[0007] This disclosure provides at least one piston rod anti-rotation structure and a hydraulic cylinder having the same.

[0008] In a first aspect, embodiments of this disclosure provide a hydraulic cylinder with a piston rod anti-rotation structure, comprising: a cylinder body; a piston rod disposed within the cylinder body; an end cap connected to the cylinder body, the end cap having an axially formed mounting through hole, the inner wall of the mounting through hole having a keyway; a rod head slidably disposed within the mounting through hole and connected to the piston rod, the side wall of the rod head having a waist-shaped groove; and a key disposed within the waist-shaped groove, protruding from the waist-shaped groove and extending into the keyway to restrict rotation of the rod head.

[0009] In one alternative embodiment, at least two cylindrical pins extending into the outer wall of the cylinder are inserted into the end cap.

[0010] In one optional embodiment, the two ends of the flat keyway pass through the corresponding end faces of the end cap.

[0011] In one alternative embodiment, one end of the waist-shaped groove facing outward from the clubhead is closed between the outer end face of the clubhead and the other end is open between the inner end face of the clubhead.

[0012] In one optional embodiment, a guide sleeve is provided inside the cylinder; a mounting platform is provided on the inner wall of the cylinder, and the guide sleeve is mounted on the mounting platform; wherein the end cap is connected to the cylinder to press the guide sleeve.

[0013] In one optional embodiment, a guide hole is provided at the axis of the guide sleeve; the rod body of the piston rod is adapted to pass through the guide hole.

[0014] In one alternative embodiment, the rod head has a threaded hole on the side facing the piston rod; the connecting end of the piston rod is adapted to pass through the guide hole and connect to the threaded hole.

[0015] In one optional embodiment, the distance between the end face of the flat key facing the piston rod and the outer end face of the end cap is [distance missing]. L 1; The maximum stroke of the piston rod is the distance... L 2; the distance L The length of 1 is greater than the distance. L The length of 2, and the ratio between the two ranges from 1.2 / 1 to 1.6 / 1.

[0016] Secondly, this disclosure also provides a piston rod anti-rotation structure for a hydraulic cylinder, comprising: an end cap for connecting to a cylinder body, the end cap having an axially oriented mounting through hole, the inner wall of the mounting through hole having a keyway; a rod head slidably disposed within the mounting through hole for connecting to a piston rod within the cylinder body, the side wall of the rod head having a waist-shaped groove; and a key disposed within the waist-shaped groove; wherein the key is adapted to protrude from the waist-shaped groove and extend into the keyway.

[0017] In one alternative embodiment, the rod head has a threaded hole for connecting the piston rod on the side facing the piston rod.

[0018] The beneficial effect of this utility model is that the hydraulic cylinder with piston rod anti-rotation structure limits the piston rod head, thereby preventing the piston rod from rotating. Specifically, a flat key is installed in the waist-shaped groove of the rod head, and the flat key protruding from the waist-shaped groove is matched with the flat key slot of the mounting through hole, so that the flat key can only move along the flat key slot during the reciprocating movement of the rod head, thereby restricting the rotation of the rod head.

[0019] 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, claims, and drawings.

[0020] 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

[0021] 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.

[0022] Figure 1 This is a schematic diagram of the structure of a hydraulic cylinder with a piston rod anti-rotation structure provided in an embodiment of the present disclosure;

[0023] Figure 2 This is a schematic diagram of the structure of an end cap provided in an embodiment of the present disclosure;

[0024] Figure 3 This is a schematic diagram of the structure of a rod head provided in an embodiment of the present disclosure;

[0025] Figure 4 This is a schematic diagram of the structure of a guide sleeve provided in an embodiment of the present disclosure;

[0026] Figure 5 This is a schematic diagram of the movement path of a piston rod provided in an embodiment of the present disclosure.

[0027] In the picture:

[0028] Cylinder block 1;

[0029] Piston rod 2, rod body 21, connecting end 22;

[0030] End cap 3, mounting through hole 31, flat keyway 32, pin hole 33, cylindrical pin 34;

[0031] Rod head 4, waist-shaped groove 41, threaded hole 42;

[0032] Flat key 5;

[0033] Guide sleeve 6, guide hole 61. Detailed Implementation

[0034] 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.

[0035] Research has revealed that, in order to solve the piston rod rotation problem, related technologies generally employ an external anti-rotation linkage. This involves designing a linkage on the piston rod, with one end fixed to the piston rod and the other end limited by a structural component on the customer machine frame or outside the hydraulic cylinder, thereby achieving the anti-rotation effect. However, this structure requires a large amount of external space, and the piston rod is generally directly connected to the customer machine frame, leaving little space for the hydraulic cylinder piston rod itself to be fixed with the anti-rotation linkage.

[0036] The shortcomings of the above solutions are the result of the utility model inventor's practice and careful research. Therefore, the discovery process of the above problems and the solutions proposed in this disclosure should be considered as contributions made by the utility model inventor to this disclosure.

[0037] 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.

[0038] 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.

[0039] like Figures 1 to 3 As shown, at least one embodiment provides a hydraulic cylinder with a piston rod anti-rotation structure, comprising: a cylinder body 1; a piston rod 2 disposed within the cylinder body 1; an end cap 3 connected to the cylinder body 1, the end cap 3 having an axially formed mounting through hole 31, the inner wall of the mounting through hole 31 having a flat keyway 32; a rod head 4 slidably disposed within the mounting through hole 31 and connected to the piston rod 2, the side wall of the rod head 4 having a waist-shaped groove 41; and a flat key 5 disposed within the waist-shaped groove 41, protruding from the waist-shaped groove 41 and extending into the flat keyway 32 to restrict the rotation of the rod head 4.

[0040] In this embodiment, the outer end of the rod head 4 is directly or indirectly connected to a drive source. After being subjected to force, it reciprocates along the mounting through hole 31 to drive the piston rod 2 to perform piston movement. In order to prevent the piston rod 2 from rotating during the reciprocating motion, the hydraulic cylinder limits the rod head 4 so that the piston rod 2 does not rotate. Specifically, the flat key 5 is installed in the waist-shaped groove 41 of the rod head 4, and the flat key 5 protruding from the waist-shaped groove 41 is engaged with the flat keyway 32 of the mounting through hole 31, so that the flat key 5 can only move along the flat keyway 32 during the reciprocating motion with the rod head 4, thereby restricting the rotation of the rod head 4.

[0041] like Figure 1 , Figure 2 As shown, in some embodiments, the end cap 3 is connected to the cylinder body 1 by a number of screws, and at least two pin holes 33 are provided on the end cap 3, and a cylindrical pin 34 is inserted into the pin hole 33, so that the cylindrical pin 34 extends into the corresponding pin hole on the outer wall of the cylinder body 1, thereby allowing the cylindrical pin 34 to bear the torque brought by the rotation of the piston rod 2, preventing the torque from acting directly on the screw and improving the service life of the screw.

[0042] like Figure 2 As shown, in some embodiments, the two ends of the flat keyway 32 penetrate the corresponding end faces of the end cap 3, thereby forming a moving channel for the flat key 5.

[0043] Specifically, the flat key 5 inside the waist-shaped groove 41 will move along the flat keyway opening 32, and will extend out of the flat keyway opening 32 during the movement, that is, part of the flat key 5 will extend out of the end cap 3.

[0044] like Figure 3 As shown, in some embodiments, one end of the waist-shaped groove 41 facing the outside of the rod head 4 is closed between the outer end face of the rod head 4, and the other end is open between the inner end face of the rod head 4.

[0045] In this embodiment, one end of the waist-shaped groove 41 is closed to prevent the flat key 5 from falling out of the waist-shaped groove 41 during movement, while the other end is open because the flat key 5 will be blocked by the piston rod 2; the open design at the other end of the waist-shaped groove 41 is to reduce the length of the rod head 4 without the flat key 5 falling out.

[0046] In some embodiments, the shape of the flat key 5 is adapted to the cavity formed between the waist-shaped groove 41 and the flat key groove 32, that is, while ensuring the smooth sliding of the flat key 5, the shaking of the flat key 5 is minimized as much as possible.

[0047] like Figure 1 As shown, in some embodiments, the inner wall of the cylinder 1 is provided with a mounting platform 11, and the guide sleeve 6 is mounted on the mounting platform 11 through an annular protrusion on the side wall, and is then pressed and limited by the end cover 3.

[0048] like Figure 1 , Figure 4 As shown, in some embodiments, a guide hole 61 is provided at the axis of the guide sleeve 6; the rod body 21 of the piston rod 2 passes through the guide hole 61 to guide the movement direction of the piston rod 2.

[0049] like Figure 1 , Figure 3 As shown, in some embodiments, the rod head 4 has a threaded hole 42 on the side facing the piston rod 2; the connecting end 22 of the piston rod 2 is adapted to pass through the guide hole 61 and connect to the threaded hole 42.

[0050] like Figure 5 As shown, in some embodiments, the distance between the end face of the flat key 5 facing the piston rod 2 and the outer end face of the end cap 3 is [distance missing]. L 1. This distance is to prevent the flat key 5 from dislodging from its mounting position; the maximum stroke of the piston rod 2 is the distance. L 2. The maximum stroke is the distance traveled by the piston rod 2 when it retracts to a point where it contacts the guide sleeve 6.

[0051] In some embodiments, distance L The length of 1 is greater than the distance. L The length of 2, and the ratio between the two ranges from 1.2 / 1 to 1.6 / 1.

[0052] At least one embodiment also provides a piston rod anti-rotation structure for a hydraulic cylinder, comprising: an end cap 3 for connecting to a cylinder body 1, the end cap 3 having an axially oriented mounting through hole 31, the inner wall of the mounting through hole 31 having a keyway 32; a rod head 4 slidably disposed within the mounting through hole 31 for connecting to a piston rod 2 within the cylinder body 1, and the side wall of the rod head 4 having a waist-shaped groove 41; and a key 5 disposed within the waist-shaped groove 41; wherein the key 5 is adapted to protrude from the waist-shaped groove 41 and extend into the keyway 32.

[0053] In some embodiments, the rod head 4 has a threaded hole 41 for connecting the piston rod 2 on the side facing the piston rod 2.

[0054] In summary, this hydraulic cylinder with a piston rod anti-rotation structure limits the piston rod 2 by restricting the rod head 4. Specifically, a flat key 5 is installed in the waist-shaped groove 41 of the rod head 4, and the flat key 5 protruding from the waist-shaped groove 41 is engaged with the flat keyway 32 of the mounting through hole 31. This allows the flat key 5 to move only along the flat keyway 32 during the reciprocating movement of the rod head 4, thereby restricting the rotation of the rod head 4.

[0055] 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.

[0056] 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.

[0057] 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 column of elements when following a column of elements, rather than individual elements in the list. For example, the expression " a , b and c "at least one of" should be understood to include only a ,only b ,only c , a and b Both a and c Both b and c Both, or a , b and c All of them.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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 with a piston rod anti-rotation structure, characterized in that, include: Cylinder block (1); Piston rod (2) is disposed inside cylinder body (1); End cap (3) is connected to cylinder body (1). The end cap (3) has an axially oriented mounting through hole (31) and the inner wall of the mounting through hole (31) has a flat keyway (32). The rod head (4) is slidably disposed within the mounting through hole (31) and connected to the piston rod (2), and the side wall of the rod head (4) is provided with a waist-shaped groove (41); and A flat key (5) is set in the waist-shaped groove (41) and protrudes from the waist-shaped groove (41) and extends into the flat key groove (32) to restrict the rotation of the rod head (4).

2. The hydraulic cylinder with a piston rod anti-rotation structure as described in claim 1, characterized in that, At least two cylindrical pins (34) are inserted into the outer wall of the cylinder body (1) on the end cap (3).

3. The hydraulic cylinder with a piston rod anti-rotation structure as described in claim 1, characterized in that, The two ends of the flat keyway (32) pass through the corresponding end faces of the end cap (3).

4. The hydraulic cylinder with a piston rod anti-rotation structure as described in claim 1, characterized in that, The waist-shaped groove (41) is closed between one end facing the outside of the rod head (4) and the outer end face of the rod head (4), and the other end is open to the inner end face of the rod head (4).

5. The hydraulic cylinder with a piston rod anti-rotation structure as described in claim 1, characterized in that, A guide sleeve (6) is provided inside the cylinder body (1); The inner wall of the cylinder body (1) is provided with a mounting platform (11), and the guide sleeve (6) is mounted on the mounting platform (11); wherein The end cap (3) is connected to the cylinder body (1) to press the guide sleeve (6).

6. The hydraulic cylinder with a piston rod anti-rotation structure as described in claim 5, characterized in that, The guide sleeve (6) has a guide hole (61) at its axis. The rod body (21) of the piston rod (2) is adapted to pass through the guide hole (61).

7. The hydraulic cylinder with a piston rod anti-rotation structure as described in claim 6, characterized in that, The rod head (4) has a threaded hole (42) on the side facing the piston rod (2). The connecting end (22) of the piston rod (2) is adapted to pass through the guide hole (61) and connect to the threaded hole (42).

8. The hydraulic cylinder with a piston rod anti-rotation structure as described in claim 7, characterized in that, The distance between the end face of the flat key (5) facing the piston rod (2) and the outer end face of the end cap (3) is [distance]. L 1; The maximum stroke of the piston rod (2) is a distance L 2; The distance L The length of 1 is greater than the distance. L The length of 2, and the ratio between the two ranges from 1.2 / 1 to 1.6 / 1.

9. A piston rod anti-rotation structure for a hydraulic cylinder, characterized in that, include: End cap (3) is used to connect with cylinder body (1). The end cap (3) has an axially oriented mounting through hole (31) and the inner wall of the mounting through hole (31) has a flat keyway (32). The rod head (4) is slidably disposed in the mounting through hole (31) for connecting with the piston rod (2) in the cylinder body (1), and the side wall of the rod head (4) is provided with a waist-shaped groove (41). The flat key (5) is set in the waist-shaped groove (41); wherein The flat key (5) is adapted to protrude from the waist-shaped groove (41) and extend into the flat key groove (32).

10. The anti-rotation structure for the piston rod of a hydraulic cylinder as described in claim 9, characterized in that, The rod head (4) has a threaded hole (41) for connecting the piston rod (2) on the side facing the piston rod (2).

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