Piston anti-loosening structure and hydraulic cylinder

Abstract

The utility model discloses a piston anti-loosing structure and a hydraulic cylinder in the field of oil cylinders, and aims to solve the problem of loosing prevention of a piston and a piston rod in the prior art, the piston anti-loosing structure comprises a retainer, the retainer is used for loosing prevention of connection of the piston rod and the piston, the retainer comprises an annular part and a supporting rod part, the supporting rod part and the annular part are of an integrated structure, and the annular part is provided with a through hole. The annular part is arranged in an end face opening hole of the piston rod, one part of the supporting rod part is arranged in an inner opening hole of the piston rod, and the other part of the supporting rod part extends into an inner wall opening hole of the piston. The retainer is installed on the piston and the piston rod to achieve looseness prevention, the annular portion of the retainer is arranged in the opening in the end face of the piston rod, the supporting rod portion extends out of the opening in the end face and then extends into the opening in the inner wall of the piston, relative rotation of the piston and the piston rod is limited, and therefore the looseness prevention effect is achieved.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic cylinders, and in particular to a piston anti-loosening structure and a hydraulic cylinder. Background Technology

[0002] The piston and piston rod are the most basic components of a hydraulic cylinder. The hydraulic cylinder uses the reciprocating motion of the piston to achieve the pushing and pulling action of the piston rod. Therefore, loosening often occurs at the threaded connection between the piston and piston rod. Piston loosening not only affects work efficiency but can also lead to serious safety accidents. Therefore, to prevent connection failure between the piston and piston rod and ensure the smooth operation of the hydraulic cylinder, the piston's anti-loosening structure must be optimized. Utility Model Content

[0003] The purpose of this utility model is to provide a piston anti-loosening structure, which provides a stop between the piston and the piston rod to enhance the anti-loosening effect.

[0004] To solve the above technical problems, the following technical solution is adopted:

[0005] In a first aspect, this utility model provides a piston anti-loosening structure, including a stop member, which is used to prevent loosening of the connection between the piston rod and the piston;

[0006] The stop member includes an annular portion and a support rod portion. The support rod portion and the annular portion are integrally formed. The annular portion is disposed in the end face opening of the piston rod. A portion of the support rod portion is disposed in the internal opening of the piston rod, and a portion extends into the internal wall opening of the piston.

[0007] Optionally, the annular portion includes an open annulus.

[0008] Optionally, the support rod is a straight rod with a certain angle of inclination relative to the plane of the annular portion.

[0009] Optionally, the end face opening is a circular slot with a certain depth provided on the end face of the piston rod, and the center of the circular slot is on the center line of the piston rod.

[0010] Optionally, an annular groove is provided on the inner wall of the end face opening near the bottom, and the annular portion is disposed in the annular groove.

[0011] Optionally, the internal opening is a through hole that extends from the inner wall of the end face opening to the outer wall of the piston rod. One end of the internal opening is connected to the annular groove on the inner wall of the end face opening, and the internal opening is inclined away from the end face of the piston rod.

[0012] Optionally, the inner wall opening is a hole that opens on the inner wall surface of the piston and extends into the piston, and the inclination angle of the inner wall opening is the same as the inclination angle of the inner opening.

[0013] Optionally, the stop is made of spring steel.

[0014] Secondly, this utility model provides a hydraulic cylinder, including a piston and a piston rod, wherein the piston and piston rod are provided with the piston anti-loosening structure described in any one of the first aspects, and the piston and piston rod are threadedly connected.

[0015] Optionally, the connection between the piston and the piston rod is coated with thread-locking adhesive.

[0016] Compared with the prior art, the beneficial effects achieved by this utility model are as follows:

[0017] 1. This utility model achieves anti-loosening by installing a stopper on the piston and piston rod. The annular part of the stopper is set in the end face opening of the piston rod, and the support rod part extends out from the inner opening of the end face opening and then extends into the inner wall opening of the piston, restricting the relative rotation of the piston and piston rod, thereby achieving the anti-loosening effect.

[0018] 2. The annular part of the stop of this utility model is set in the annular groove with an opening on the end face, which restricts its movement along the center line of the piston rod. The annular part is a circular ring structure with an opening, which makes it easier to install and disassemble. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the piston anti-loosening structure installed in the piston and piston rod in an embodiment of this utility model;

[0020] Figure 2 This is an enlarged structural schematic diagram of the piston anti-loosening structure of this utility model.

[0021] Figure 3 This is one of the schematic diagrams of the stop component structure of this utility model;

[0022] Figure 4 This is the second schematic diagram of the stop structure of this utility model;

[0023] Figure 5 This is a schematic diagram of the opening and annular groove structure on the upper end face of the piston rod of this utility model.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1. Stop; 101. Annular part; 102. Support rod part; 2. Piston; 201. Inner wall opening; 3. Piston rod; 301. End face opening; 302. Internal opening; 303. Annular groove; 4. Guide sleeve. Detailed Implementation

[0026] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use.

[0027] Example 1

[0028] This embodiment provides a piston anti-loosening structure, including a stop 1. The stop 1 is partially disposed inside the piston 2 and partially disposed inside the piston rod 3, thereby preventing loosening of the connection between the piston 2 and the piston rod 3.

[0029] like Figure 1-Figure 2 As shown, the stop 1 is installed inside the end face of the piston rod 3. A part of the stop 1 extends into the interior of the piston 2. The stop 1 is connected to the piston rod 3 through a part of the stop 1, and the other part extends into the interior of the piston 2 to realize the relative rotation of the piston 2 and the piston rod 3.

[0030] like Figure 3 As shown, the stop 1 includes an arc-shaped annular portion 101 and a support rod portion 102 on the annular portion. The support rod portion 102 has a certain inclination angle relative to the plane of the annular portion 101, and the inclination support rod portion 102 extends into the piston 2 to ensure the stability of the connection.

[0031] An annular portion 101 is installed in the end face opening 301 of the piston rod 3. A support rod portion 102 extends through the inner wall opening 302 of the end face opening 301, passing through the piston rod 3 and reaching the inner wall opening 201 of the piston 2. One end of the support rod portion 102 is positioned within the inner wall opening 201 of the piston 2 to achieve an anti-loosening effect. When the piston 2 and piston rod 3 vibrate and the connection begins to loosen, the annular portion 101 within the piston rod 3 and the end of the support rod portion 102 within the piston 2 restrict the relative movement of the piston 2 and piston rod 3, thereby preventing loosening.

[0032] Example 2

[0033] like Figure 1-Figure 5As shown, this embodiment is based on the piston anti-loosening structure provided in Embodiment 1, with the difference being that: the end face opening 301 is a circular slot with a certain depth on the end face of the piston rod 3, and the center of the circular slot is on the central axis of the piston rod 3. An annular groove 303 is provided on the inner wall of the end face opening 301, and the annular groove 303 is close to the bottom of the end face opening 301. The annular groove 303 is used to place the annular portion 101 of the stop member 1. An opening is formed in the annular groove 303, extending through to the outer wall of the piston rod 3 to form an internal opening 302. The internal opening 302 is inclined away from the end face of the piston rod 3, and the inclination and size of the internal opening 302 are adapted to the inclination and size of the support rod portion 102.

[0034] The annular portion 101 on the stop 1 is a circular arc with an opening angle of less than 90 degrees, which is better for installing the stop. The diameter of the end face opening 301 is slightly smaller than the diameter of the annular portion 101. The annular portion 101 is placed in the annular groove 303 of the end face opening 301, and the movement of the annular portion 101 along the central axis of the piston rod 3 is restricted by the annular groove 303.

[0035] The support rod portion 102 on the stop member 1 is inclined at a certain angle relative to the annular portion 101. The support rod portion 102 is a straight rod and is set in the internal opening 302 of the piston rod 3. Its end extends into the inner wall opening 201 of the inner wall of the piston 2. The inclination angle of the inner wall opening 201 is the same as that of the internal opening 302 and the support rod portion 102.

[0036] The stop 1 can be made of spring steel or other high-strength materials. During installation, the included angle between the support rod 102 and the annular part 101 is slightly deformed, which does not affect the stopping effect. After installation, the annular part 101 is compressed in the annular groove 303.

[0037] In use, piston 2 and piston rod 3 are connected together. First, the support rod part 102 of the stop 1 is inserted into the interior of the end face opening 301. The support rod part 102 extends into the opening of the inner opening 302 of the inner wall of the end face opening 301. Then, the entire stop 1 is placed in the end face opening 301. When the annular part 101 of the stop 1 is located in the annular groove 303, the end of the support rod part 102 extends from the inner opening 302 to the outside of the piston rod 3 and continues to extend into the inner wall opening 201 of the piston 2, thus realizing the installation of the stop 1.

[0038] Example 3

[0039] This embodiment provides a hydraulic cylinder, including a piston 2 and a piston rod 3. A guide sleeve 4 is also provided at the end of the piston 2. One end of the piston rod 3 is threadedly connected to the piston 2, and thread-locking adhesive is applied at the connection. The piston rod 3 and the piston 2 are provided with the piston anti-loosening structure described in Embodiment 1 or Embodiment 2.

[0040] Specifically, an end face opening 301 is provided at the end where the piston rod 3 connects to the piston 2. An annular groove 303 is provided in the end face opening 301. An internal opening 302 is provided on the inner wall of the end face opening 303, opening towards the outer wall of the piston rod 3. The support rod part 102 of the stop member 1 is installed from the inner wall of the end face opening 301 into the internal opening 302. The support rod part 102 extends out of the piston rod 3, and a part of the part extending out of the piston rod 3 extends into the inner wall opening 201 on the inner wall of the piston 2. The annular part 102 is restricted by the annular groove 303, and the support rod part 102 is restricted from moving by the inner wall opening 201 on the piston 2 and the internal opening 302 on the piston rod 3, thereby realizing the relative rotation of the piston 2 and the piston rod 3. The anti-loosening effect is enhanced by the thread anti-loosening adhesive and the piston anti-loosening structure.

[0041] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A piston anti-loosening structure, characterized in that, Includes a stop (1), which is used to prevent loosening of the connection between the piston rod (3) and the piston (2); The stop member (1) includes an annular portion (101) and a support rod portion (102). The support rod portion (102) and the annular portion (101) are integrally formed. The annular portion (101) is disposed in the end face opening (301) of the piston rod (3). Part of the support rod portion (102) is disposed in the internal opening (302) of the piston rod (3), and part of it extends into the inner wall opening (201) of the piston (2).

2. The piston anti-loosening structure according to claim 1, characterized in that, The annular portion (101) includes an open annulus.

3. The piston anti-loosening structure according to claim 1, characterized in that, The support rod (102) is a straight rod with a certain angle of inclination relative to the plane of the annular part (101).

4. The piston anti-loosening structure according to claim 1, characterized in that, The end face opening (301) is a circular slot with a certain depth provided on the end face of the piston rod (3), and the center of the circular slot is on the center line of the piston rod (3).

5. The piston anti-loosening structure according to claim 1, characterized in that, The end face opening (301) has an annular groove (303) on its inner wall near the bottom, and the annular part (101) is disposed in the annular groove (303).

6. The piston anti-loosening structure according to claim 5, characterized in that, The internal opening (302) is a through hole that extends from the inner wall of the end face opening (301) to the outer wall of the piston rod (3). One end of the internal opening (302) is connected to the annular groove (303) on the inner wall of the end face opening (301). The internal opening (302) is inclined away from the end face of the piston rod (3).

7. The piston anti-loosening structure according to claim 6, characterized in that, The inner wall opening (201) is a hole that extends into the piston from the inner wall surface of the piston (2), and the inclination angle of the inner wall opening (201) is the same as the inclination angle of the inner opening (302).

8. The piston anti-loosening structure according to claim 1, characterized in that, The material of the stop (1) is spring steel.

9. A hydraulic cylinder, comprising a piston (2) and a piston rod (3), characterized in that, The piston (2) and piston rod (3) are provided with piston anti-loosening structures as described in any one of claims 1-8, and the piston (2) and piston rod (3) are threadedly connected.

10. The hydraulic cylinder according to claim 9, characterized in that, The connection between the piston and the piston rod is coated with thread-locking adhesive.

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