Piston rod assembly for hydraulic cylinder

Abstract

The utility model provides a piston rod assembly for a hydraulic cylinder, which relates to the technical field of piston rods, and comprises a piston rod main body and a piston head, the piston head is arranged at a position close to the bottom end of the piston rod main body, and an extension rod is arranged in the middle of the piston rod main body. The piston rod body is slidably connected to the extension rod, and a buffering device is arranged on the face, close to the hydraulic cylinder, of the bottom end of the piston rod body. A self-lubricating bearing sleeve is arranged on the outer wall of the piston head; the buffering device is arranged on the side, close to the hydraulic cylinder, of the bottom end of the piston rod body, the working stability of the hydraulic cylinder is improved through the design of the buffering device, the service life of equipment is prolonged, meanwhile, noise generated during high-frequency working is reduced, and the working environment is improved.

Description

Technical Field

[0001] This utility model relates to the field of piston rod technology, and in particular to a piston rod assembly for a hydraulic cylinder. Background Technology

[0002] A hydraulic cylinder is an actuator that converts hydraulic energy into mechanical energy, and it is widely used in engineering machinery, metallurgical equipment, shipbuilding, aerospace and other fields. The piston rod assembly is one of the core components of a hydraulic cylinder, mainly composed of a piston rod, piston head, seals and connecting parts. Its working principle is that the pressure of hydraulic oil drives the piston rod to reciprocate, thereby driving an external load.

[0003] Traditional hydraulic cylinders lack effective buffering devices at the end of their stroke, resulting in direct collision between the piston head and the cylinder body, causing impact and vibration that affects equipment stability and lifespan. Furthermore, insufficient buffering design leads to significant noise during high-frequency operation. Additionally, the high sliding friction between the piston rod and cylinder body results in increased energy loss and wear. Moreover, traditional lubrication methods (such as external oiling) have limited effectiveness and cannot meet the demands of long-term, high-intensity operation. Therefore, we propose a piston rod assembly for hydraulic cylinders. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies. Traditional hydraulic cylinders lack effective buffering devices at the end of their stroke, causing direct collisions between the piston head and the cylinder body, resulting in impacts and vibrations that affect equipment stability and lifespan. Furthermore, due to insufficient buffering structure design, the hydraulic cylinder generates significant noise during high-frequency operation. On the other hand, the sliding friction between the piston rod and the cylinder body is substantial, leading to increased energy loss and wear. Moreover, traditional lubrication methods (such as external oiling) have limited effectiveness and are insufficient to meet the demands of long-term, high-intensity operation.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A piston rod assembly for a hydraulic cylinder includes a piston rod body and a piston head. The piston head is mounted on the piston rod body near the bottom end. An extension rod is provided in the middle of the piston rod body. The piston rod body is slidably connected to the extension rod. A buffer device is provided on the bottom end of the piston rod body near the hydraulic cylinder.

[0007] A self-lubricating bearing sleeve is provided on the outer wall of the piston head.

[0008] Furthermore, a first groove is provided on the outer wall of the extension rod, and a plurality of second grooves are provided on one side of the first groove, the second grooves being "L" shaped.

[0009] Furthermore, a snap-fit ​​hole is provided at the end of the second groove away from the first groove, and a snap-fit ​​block is provided on the inner wall of one end of the piston rod body connecting to the extension rod. The snap-fit ​​block is cylindrical and is slidably connected in the first groove and the second groove. The snap-fit ​​block and the snap-fit ​​hole fit together.

[0010] Furthermore, the maximum tensile length of the piston rod body is the same as the length of the first groove.

[0011] Furthermore, the outer wall of the piston head is provided with a number of recessed patterns, and the inner wall of the self-lubricating bearing sleeve is provided with a number of raised strips, the raised strips and the recessed patterns matching each other.

[0012] Furthermore, the self-lubricating bearing sleeve is made of composite material, and a solid lubricant is provided inside the self-lubricating bearing sleeve.

[0013] Furthermore, the buffer device is equipped with several springs, and each spring contains a telescopic sleeve.

[0014] Furthermore, a groove is formed at the bottom of the piston rod body, and a thread is provided in the groove. A buffer pad is provided on the side of the bottom of the piston rod body near the buffer device, and the piston rod body is threadedly connected to the buffer device.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. A buffer device is installed on the bottom end of the piston rod body near the hydraulic cylinder. The design of the buffer device improves the working stability of the hydraulic cylinder, extends the service life of the equipment, and reduces noise during high-frequency operation, thus improving the working environment.

[0017] 2. A self-lubricating bearing sleeve is installed on the outer wall of the piston head. During the reciprocating motion of the piston rod, the self-lubricating bearing sleeve continuously releases lubricant, forming a low-friction interface, which significantly reduces the sliding friction between the piston rod and the cylinder. This design not only reduces energy loss but also reduces wear and extends the service life of the piston rod and the cylinder, making it particularly suitable for long-term, high-intensity working scenarios.

[0018] 3. The piston rod body and the extension rod are connected by a snap-fit ​​block and a groove, which makes the piston rod length adjustable. Users can adjust the extension length of the piston rod according to actual needs, thus improving the versatility and adaptability of the hydraulic cylinder. Attached Figure Description

[0019] Figure 1 A schematic diagram of the overall structure of a piston rod assembly for a hydraulic cylinder provided by this utility model;

[0020] Figure 2A schematic diagram of a buffer device structure for a piston rod assembly of a hydraulic cylinder provided by this utility model;

[0021] Figure 3 A schematic diagram of a spring structure for a piston rod assembly in a hydraulic cylinder provided by this utility model;

[0022] Figure 4 A schematic diagram of an extension rod structure for a piston rod assembly in a hydraulic cylinder provided by this utility model;

[0023] Figure 5 This is a partial structural diagram of point A of a piston rod assembly for a hydraulic cylinder provided by this utility model.

[0024] Legend: 1. Piston rod body; 2. Piston head; 101. Extension rod; 102. Buffer device; 103. First groove; 104. Second groove; 105. Snap-fit ​​hole; 106. Snap-fit ​​block; 107. Spring; 108. Telescopic sleeve; 109. Buffer pad; 201. Self-lubricating bearing sleeve; 202. Recessed pattern; 203. Raised strip. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0026] To facilitate understanding of this utility model, a more comprehensive description of this utility model will be provided below with reference to relevant embodiments, and several embodiments of this utility model will be given. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of this utility model more thorough and complete.

[0027] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0029] Example 1

[0030] like Figure 1-5 As shown, this utility model provides a technical solution: a piston rod assembly for a hydraulic cylinder, including a piston rod body 1 and a piston head 2. The piston head 2 is installed near the bottom end of the piston rod body 1. An extension rod 101 is provided in the middle of the piston rod body 1, and the piston rod body 1 is slidably connected to the extension rod 101. The user can adjust the length of the piston rod body 1 according to actual needs through the extension rod 101. A buffer device 102 is provided on the bottom end of the piston rod body 1 near the hydraulic cylinder. When the piston rod body 1 approaches the end of its stroke, the buffer device 102 starts to work, absorbing impact energy and reducing vibration and noise. This design improves the working stability and service life of the hydraulic cylinder. A self-lubricating bearing sleeve 201 is provided on the outer wall of the piston head 2. The self-lubricating bearing sleeve 201 is used to reduce friction and wear.

[0031] Example 2

[0032] like Figure 1-5 As shown, a first groove 103 is formed on the outer wall of the extension rod 101. Several second grooves 104 are formed on one side of the first groove 103. The second grooves 104 are L-shaped. A snap-fit ​​hole 105 is formed at the end of the second groove 104 away from the first groove 103. A snap-fit ​​block 106 is provided on the inner wall of the piston rod body 1 at the end connected to the extension rod 101. The snap-fit ​​block 106 is cylindrical and slidably connected within the first groove 103 and the second grooves 104. The snap-fit ​​block 106 and the snap-fit ​​hole 105 are mutually engaged. This engagement design ensures a stable connection and avoids stress concentration problems that may occur with traditional threaded connections or welding methods. The maximum extension length of the piston rod body 1 is the same as the length of the first groove 103. Users can adjust the extension length of the piston rod body 1 according to actual needs, improving the versatility and adaptability of the hydraulic cylinder.

[0033] The outer wall of the piston head 2 is provided with several recessed patterns 202, and the inner wall of the self-lubricating bearing sleeve 201 is provided with several raised strips 203. The raised strips 203 and the recessed patterns 202 fit together. The self-lubricating bearing sleeve 201 is made of composite material and contains solid lubricant. The raised strips 203 on the inner wall of the self-lubricating bearing sleeve 201 and the recessed patterns 202 on the outer wall of the piston head 2 fit together, which not only enhances the sealing performance, but also further optimizes the lubrication effect. This integrated design reduces the risk of hydraulic oil leakage, while reducing the maintenance frequency and cost.

[0034] The buffer device 102 has several springs 107 installed inside, and telescopic sleeves 108 are installed inside the springs 107. A groove is opened at the bottom of the piston rod body 1, and the groove is threaded. A buffer pad 109 is provided on the bottom of the piston rod body 1 near the buffer device 102. The piston rod body 1 is threadedly connected to the buffer device 102. When the piston rod body 1 approaches the end of its stroke, the buffer device 102 absorbs the impact energy through the elastic deformation of the springs 107, which significantly reduces the direct collision between the piston head 2 and the cylinder, and reduces the impact and vibration.

[0035] The working process of this utility model is as follows: When using a piston rod assembly for a hydraulic cylinder, the length of the piston rod is first adjusted according to the user's actual needs by sliding the position of the piston rod body 1 on the extension rod 101. The locking block 106 slides within the first groove 103 and the second groove 104, and finally engages with the locking hole 105 to ensure a stable connection.

[0036] When the piston rod body 1 approaches the end of its stroke, the buffer device 102 begins to function. The spring 107 and the telescopic sleeve 108 absorb impact energy through elastic deformation, reducing direct collision between the piston head 2 and the cylinder body, thus reducing impact and vibration. The solid lubricant in the self-lubricating bearing sleeve 201 is continuously released during the reciprocating motion of the piston rod, forming a low-friction interface and reducing friction and wear. The matching design of the raised strip 203 and the recessed pattern 202 enhances the sealing performance and reduces hydraulic oil leakage. Through the synergistic effect of the buffer device 102 and the self-lubricating bearing sleeve 201, the hydraulic cylinder operates more smoothly at high frequencies, with lower noise, less energy loss, and extended service life of the equipment.

[0037] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A piston rod assembly for a hydraulic cylinder comprising a piston rod body (1) and a piston head (2), which is mounted on the piston rod body (1) in the region of the bottom end, characterized in that: The middle of the piston rod body (1) is provided with an extension rod (101), the piston rod body (1) is slidingly connected on the extension rod (101), and the bottom end of the piston rod body (1) is provided with a buffer device (102) on the side close to the hydraulic cylinder. The outer wall of the piston head (2) is provided with a self-lubricating bearing sleeve (201).

2. A piston rod assembly for a hydraulic cylinder according to claim 1, characterized in that: The outer wall of the extension rod (101) is provided with a first groove (103), a plurality of second grooves (104) are formed on one side of the first groove (103), and the second grooves (104) are in the shape of "L".

3. A piston rod assembly for a hydraulic cylinder according to claim 2, characterized in that: The end of the second groove (104) away from the first groove (103) is provided with a clamping hole (105), the inner wall of one end of the extension rod (101) connected with the piston rod body (1) is provided with a clamping block (106), the clamping block (106) is in the shape of a cylinder, the clamping block (106) is slidingly connected in the first groove (103) and the second groove (104), and the clamping block (106) and the clamping hole (105) are matched with each other.

4. A piston rod assembly for a hydraulic cylinder according to claim 2, characterized in that: The maximum stretching length of the piston rod body (1) is the same as the length of the first groove (103).

5. A piston rod assembly for a hydraulic cylinder according to claim 1, characterized in that: The outer wall of the piston head (2) is provided with a plurality of recessed patterns (202), the inner wall of the self-lubricating bearing sleeve (201) is provided with a plurality of convex strips (203), and the convex strips (203) and the recessed patterns (202) are matched with each other.

6. A piston rod assembly for a hydraulic cylinder according to claim 1, characterized in that: The self-lubricating bearing sleeve (201) is made of composite material, and the self-lubricating bearing sleeve (201) is provided with a solid lubricant.

7. A piston rod assembly for a hydraulic cylinder according to claim 1, characterized in that: The buffer device (102) is internally provided with a plurality of springs (107), and the spring (107) is internally provided with a telescopic sleeve (108).

8. A piston rod assembly for a hydraulic cylinder according to claim 1, characterized in that: The bottom of the piston rod body (1) is provided with a groove, and the groove is provided with a thread, the side of the bottom of the piston rod body (1) close to the buffer device (102) is provided with a buffer pad (109), and the piston rod body (1) and the buffer device (102) are screw-connected.

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