A new type of fixing structure of a plunger cylinder piston

Abstract

The utility model discloses a hydraulic cylinder technical field's a kind of novel fixed structure of plunger cylinder piston, including cylinder body, the piston of being arranged in cylinder body and the piston rod being connected with piston;Card key slot is equipped on the piston rod, and card key is installed in card key slot, and one end of card key is provided with card key cap, and the recess surface of card key cap is attached with card key;Card joint groove for installing shaft baffle is also provided on the piston rod, and shaft baffle cooperates with card key cap to limit the axial direction of card key and card key cap, so that the piston is fixed on the piston rod, and the threaded connection structure is not set between the piston and the piston rod;The utility model replaces traditional thread fixing mode by the cooperation of card key, card key cap and shaft baffle, and the structure is simple, and it is convenient to assemble, can effectively prevent loosening, improve assembly efficiency and use reliability.

Description

Technical Field

[0001] This utility model relates to a novel fixing structure for a plunger cylinder piston, belonging to the field of hydraulic cylinder technology. Background Technology

[0002] In existing plunger cylinder structures, the piston is usually connected and fixed to the piston rod by a threaded nut. Although this fixing method is widely used, it has obvious shortcomings in actual processing and assembly.

[0003] On the one hand, the piston rod end needs to be machined with external threads, which requires high precision, involves complex processing procedures, and takes a long time, increasing production costs. On the other hand, during the long-term operation of the piston cylinder, the piston is subjected to reciprocating pressure impact and vibration, which can easily cause the threaded connection to loosen, affecting the reliability of the connection between the piston and the piston rod, and even leading to seal failure and equipment malfunction.

[0004] Furthermore, in some compact and space-constrained piston cylinders, the threaded structure further increases the axial dimension, which is not conducive to the miniaturization and compact design of the whole machine. Utility Model Content

[0005] The purpose of this invention is to solve the problems of complex processing procedures, high processing costs, low assembly efficiency, and low connection reliability in existing plunger cylinders where the piston and piston rod are fixed by threaded nuts.

[0006] To solve the above-mentioned technical problems, this utility model is implemented using the following technical solution: A novel fixing structure for a plunger cylinder piston is provided, comprising: a cylinder body, a piston disposed within the cylinder body, and a piston rod connected to the piston; The piston rod is provided with a locking key, and a locking key cap is provided at one end of the locking key; The concave surface of the keycap fits against the key. The keycap and key are axially limited by a retaining ring.

[0007] Furthermore, one end of the piston rod is provided with a retaining groove for a retaining ring for engaging the shaft.

[0008] Furthermore, the piston rod is provided with a key slot for placing the key.

[0009] Furthermore, the key is configured as two identical semi-circular structures placed inside the key slot.

[0010] Furthermore, the keycap is fitted over the outside of the key and contacts the piston end face to achieve axial limiting of the piston.

[0011] Furthermore, the retaining ring is a shaft retaining ring, which is set on the piston rod and cooperates with the keycap to limit and fix the keycap.

[0012] Furthermore, both the keycap and the key are located on the same side of the shaft retaining ring.

[0013] Furthermore, the keycap, key, and retaining ring are arranged coaxially.

[0014] Compared with the prior art, the beneficial effects achieved by this utility model are as follows: This invention replaces the traditional threaded nut connection by setting a keyway on the piston rod, installing a key, and then using the keyway cap and shaft retaining ring to axially limit and fix the piston. This allows the piston to be stably and reliably fixed on the piston rod, reducing processing steps, processing difficulty and production costs. At the same time, it can effectively prevent loosening under reciprocating motion, pressure impact and vibration conditions, and improve the stability of the piston and piston rod connection. Attached Figure Description

[0015] Figure 1 This is a cross-sectional view of the novel fixing structure of the plunger cylinder piston proposed in this utility model; Figure 2 This is a cross-sectional view of the key cap of the novel fixing structure for the piston of the plunger cylinder proposed in this utility model; Figure 3 This is a diagram of the locking structure of the novel fixing structure for the piston of the plunger cylinder proposed in this utility model.

[0016] Figure label: 1. Shaft retaining ring; 2. Keycap; 3. Key; 4. Piston; 5. Cylinder; 6. Piston rod. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0018] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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.

[0019] This embodiment relates to a novel fixing structure for a plunger cylinder piston, such as... Figures 1 to 3As shown, it includes a cylinder body 5, a piston 4 disposed inside the cylinder body 5, and a piston rod 6 connected to the piston 4; the piston rod 6 is used to perform reciprocating linear motion inside the cylinder body 5, thereby realizing the extension and retraction function of the plunger cylinder.

[0020] In this embodiment, as Figure 2 and Figure 3 As shown, one end of the piston rod 6 is provided with a keyway, and a key 3 is placed in the keyway; the key 3 is preferably set as two identical semi-circular structures, which facilitates assembly into the keyway in the radial direction during installation.

[0021] One end of the key 3 is provided with a keycap 2. The concave surface of the keycap 2 fits against the outer surface of the key 3, so that the keycap 2 is fitted on the outside of the key 3, thereby fixing the key 3.

[0022] The retaining cap 2 contacts the end face of the piston 4, providing axial support and limiting the piston 4, thereby ensuring the piston 4 is stably fixed to the piston rod 6. To prevent the retaining cap 2 from axially dislodging, a retaining groove for engaging the shaft retaining ring 1 is provided at the end of the piston rod 6 near the retaining key 3. The shaft retaining ring 1 is fitted inside the retaining groove. The shaft retaining ring 1 cooperates with the retaining cap 2 to axially limit the retaining cap 2 and the retaining key 3, thereby reliably fixing the piston 4 to the piston rod 6.

[0023] Specifically, the shaft retaining ring 1 is engaged in the engagement groove at the end of the piston rod 6. During the assembly process, the shaft retaining ring 1 needs to be opened so that it is engaged in the engagement groove.

[0024] In this embodiment, the keycap 2 and the key 3 are both located on the same side of the shaft retaining ring 1, and the keycap 2, the key 3 and the shaft retaining ring 1 are arranged coaxially. The shaft retaining ring 1 is located outside the keycap 2, forming an axial locking structure, which restricts the keycap 2 between the piston 4 and the shaft retaining ring 1, thereby preventing loosening or displacement due to vibration or pressure changes during operation.

[0025] It should be noted that in this embodiment, the piston 4 and piston rod 6 are not connected by a threaded structure. Instead, the piston 4 is fixed by the cooperation of the retaining key 3, the retaining key cap 2, and the shaft retaining ring 1. Compared with the traditional threaded nut connection method, this structure reduces the thread processing steps, makes assembly more convenient and faster, and avoids the problem of loose threads.

[0026] 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 novel fixing structure for a plunger cylinder piston, comprising: The cylinder body (5), the piston (4) disposed within the cylinder body (5), and the piston rod (6) connected to the piston (4) are characterized in that: The piston rod (6) is provided with a locking key (3), and a locking key cap (2) is provided at one end of the locking key (3). The recessed surface of the keycap (2) is in contact with the key (3); The keycap (2) and key (3) are axially limited by the shaft retaining ring (1).

2. The novel fixing structure for a plunger cylinder piston according to claim 1, characterized in that, One end of the piston rod (6) is provided with a retaining groove for a retaining ring (1) for engaging the shaft.

3. The novel fixing structure for a plunger cylinder piston according to claim 1, characterized in that, The piston rod (6) is provided with a key slot for placing the key (3).

4. The novel fixing structure for a plunger cylinder piston according to claim 3, characterized in that, The key (3) is configured as two identical semi-circular structures placed in the key slot.

5. The novel fixing structure for a plunger cylinder piston according to claim 1, characterized in that, The keycap (2) is sleeved on the outside of the keycap (3) and contacts the end face of the piston (4) to achieve axial positioning of the piston (4).

6. The novel fixing structure for a plunger cylinder piston according to claim 1, characterized in that, The retaining ring is a shaft retaining ring (1), which is set on the piston rod (6) and cooperates with the keycap (2) to limit and fix the keycap (2).

7. The novel fixing structure for a plunger cylinder piston according to claim 1, characterized in that, The keycap (2) and key (3) are both located on the same side of the shaft retaining ring (1).

8. The novel fixing structure for a plunger cylinder piston according to claim 1, characterized in that, The keycap (2), key (3) and shaft retaining ring (1) are arranged coaxially.

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