Piston rod structure with buffering function
By incorporating a buffer component and a buffer chamber structure within the hydraulic cylinder, combined with springs and hydraulic oil damping, the problem of piston rod impacting the hydraulic cylinder is solved, achieving the buffering function of the piston rod and extending its service life.
Patent Information
- Application Number
- CN202423207236.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-25
- Publication Date
- 2026-01-06
- Estimated Expiration
- 2034-12-25
AI Technical Summary
The piston rod of the existing hydraulic cylinder is prone to impacting the open end and bottom end of the hydraulic cylinder body during operation, which can cause damage to the components and affect their service life.
First and second buffer components are installed inside the hydraulic cylinder. The buffer components consist of a buffer layer made of rubber and an internal buffer chamber. Combined with a spring structure, the buffer layer contacts the inclined surface of the hydraulic cylinder, and the hydraulic oil in the buffer chamber generates a damping effect, reducing the speed of the piston rod.
It effectively avoids direct impact between the piston rod and the hydraulic cylinder, extending the service life of the components. Through the combined action of the buffer layer and hydraulic oil, it reduces the movement speed and minimizes mechanical collisions.
Smart Images
Figure CN223767830U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of hydraulic cylinder technology, and in particular to a piston rod structure with a buffer function. Background Technology
[0002] Hydraulic cylinders use high-pressure fluid supplied by a hydraulic pump to drive a piston rod, thereby achieving linear motion or oscillation in machinery. Currently, hydraulic cylinders consist of a cylinder body containing a piston rod. However, existing piston rods exhibit the following main problems during operation:
[0003] When the piston rod is fully extended, it is prone to impacting the open end of the hydraulic cylinder; when the piston rod is fully retracted, it will impact the bottom end of the hydraulic cylinder. Therefore, the direct mechanical collision will cause damage to the components, thus affecting their service life. Utility Model Content
[0004] The purpose of this invention is to provide a piston rod structure with a buffer function that extends service life.
[0005] To achieve the above-mentioned objectives, the piston rod structure with buffer function of this utility model adopts the following technical solution:
[0006] A piston rod structure with a buffer function includes a piston rod disposed inside a hydraulic cylinder body. A piston is disposed at one end of the piston rod, and the other end of the piston rod extends out of the hydraulic cylinder body. The piston divides the interior of the hydraulic cylinder body into a first pressure chamber and a second pressure chamber. A first buffer element and a second buffer element are respectively disposed at both ends of the piston rod, with the first buffer element located in the first pressure chamber and the second buffer element located in the second pressure chamber. Both the first and second buffer elements have buffer layers. The buffer layer of the first buffer element contacts the open end of the hydraulic cylinder body, and the buffer layer of the second buffer element contacts the bottom end of the hydraulic cylinder body.
[0007] The buffer layer is made of rubber and has a buffer cavity inside. Both the first and second buffers have flow channels inside, and the buffer cavity has a flow port that connects to the flow channel. The first buffer has a first fluid inlet that connects to the flow channel inside the first buffer. The second buffer has a second fluid inlet that connects to the flow channel inside the second buffer.
[0008] Preferably, the first buffer member is provided with a first spring, which passes through the flow port into the buffer chamber. One end of the first spring is disposed on the first buffer member, and the other end of the first spring contacts the inner wall of the buffer chamber. By supporting the buffer chamber with the first spring, more hydraulic oil can be poured into the buffer chamber, improving the damping effect generated by the hydraulic oil in the buffer chamber. At the same time, combined with the buffering effect of the first spring itself, the movement speed of the piston rod is further reduced, avoiding impact when the piston rod is fully extended.
[0009] Preferably, the second buffer member is equipped with a second spring, which passes through the flow port into the buffer chamber. One end of the second spring is mounted on the second buffer member, and the other end contacts the inner wall of the buffer chamber. By supporting the buffer chamber with the second spring, more hydraulic oil can be pumped into the buffer chamber, improving the damping effect of the hydraulic oil in the buffer chamber. At the same time, combined with the buffering effect of the second spring itself, the movement speed of the piston rod is further reduced, avoiding impact when the piston rod is fully retracted.
[0010] Preferably, both the first and second buffer components are configured as frustum structures, each including a top surface, a bottom surface, and a side surface. The area of the top surface is smaller than the area of the bottom surface. The side of the frustum structure connected to the piston is the bottom surface. The buffer layer is disposed on the side surface of the frustum. The inner wall of the open end of the hydraulic cylinder has a first inclined surface that contacts the buffer layer of the first buffer component. The inner wall of the bottom end of the hydraulic cylinder has a second inclined surface that contacts the buffer layer of the second buffer component. When the piston rod extends, the buffer layer of the first buffer component contacts the first inclined surface first, reducing impact under the buffering effect of the buffer layer. Similarly, when the piston rod retracts, the buffer layer of the second buffer component contacts the second inclined surface first, reducing impact under the buffering effect of the buffer layer.
[0011] Preferably, the piston moves to the connection point between the first inclined surface and the side of the hydraulic cylinder when the piston rod is fully extended. When the piston rod is fully extended, the piston moves to the connection point between the first inclined surface and the side of the hydraulic cylinder. At this point, the piston cannot continue to move. This invention uses the first inclined surface to limit movement in the extended state.
[0012] Preferably, the piston moves to the connection point between the second inclined surface and the side of the hydraulic cylinder when the piston rod is fully retracted. When the piston rod is fully retracted, the piston moves to the connection point between the second inclined surface and the side of the hydraulic cylinder. At this point, the piston cannot continue to move. This invention uses the second inclined surface to limit movement during the retracted state.
[0013] Preferably, one first fluid inlet and one second fluid inlet are provided. The presence of both prevents the hydraulic oil in the buffer chamber from being rapidly discharged, thus achieving a damping effect.
[0014] Preferably, the hydraulic cylinder body is provided with a first oil port and a second oil port. The first oil port is located at the open end of the hydraulic cylinder body, and the second oil port is located at the bottom end of the hydraulic cylinder body. The inner port of the first oil port connects to the first fluid inlet when the piston rod is fully extended, and the inner port of the second oil port connects to the second fluid inlet when the piston rod is fully retracted. When oil enters through the first oil port, the hydraulic oil can quickly pass through the first fluid inlet and enter the buffer chamber through the flow channel; when oil enters through the second oil port, the hydraulic oil can quickly pass through the second fluid inlet and enter the buffer chamber through the flow channel.
[0015] Preferably, the piston is provided with a sealing ring on its outer periphery, and the sealing ring is in contact with the inner wall of the hydraulic cylinder.
[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0017] 1. This utility model incorporates a first buffer and a second buffer. The first buffer is located within a first pressure chamber, and the second buffer is located within a second pressure chamber. When the piston rod extends until the buffer layer of the first buffer contacts the open end of the hydraulic cylinder, the buffer layer reduces the piston rod's movement speed, preventing impact between the first buffer and the open end of the hydraulic cylinder. Similarly, when the piston rod retracts, there is no impact between the second buffer and the bottom end of the hydraulic cylinder. Therefore, this design reduces component damage, extends service life, and is practical.
[0018] 2. The buffer layer of this utility model is equipped with a buffer bladder, which is filled with hydraulic oil. When it comes into contact with the opening end or the bottom end of the hydraulic cylinder, the buffer layer, made of rubber, plays a buffering role. At the same time, the hydraulic oil in the buffer bladder also plays a damping role, further improving the buffering effect and reducing the movement speed of the piston rod, so as not to hit the inner wall of the hydraulic cylinder. The overall structure is reasonable and the design is ingenious. Attached Figure Description
[0019] Figure 1 This is a schematic diagram of the fully contracted state of this utility model;
[0020] Figure 2 for Figure 1 Enlarged view of part A;
[0021] Figure 3 This is a schematic diagram of the fully extended state of this utility model;
[0022] Figure 4 for Figure 3 Enlarged view of part B.
[0023] The components include: 1 hydraulic cylinder body, 101 first pressure chamber, 102 second pressure chamber, 2 piston rod, 3 first inclined surface, 4 first oil port, 5 first buffer, 6 piston, 7 second buffer, 8 second oil port, 9 second inclined surface, 10 flow channel, 11 flow port, 12 first spring, 13 buffer bladder, 14 buffer layer, 15 first fluid inlet, 16 second fluid inlet, 17 second spring, and 18 sealing ring. Detailed Implementation
[0024] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are only for illustrating the present invention and not for limiting the scope of the present invention. After reading the present invention, any modifications of the present invention in various equivalent forms by those skilled in the art will fall within the scope defined by the appended claims.
[0025] like Figure 1-4As shown, a piston rod structure with a buffer function includes a piston rod 2 disposed inside a hydraulic cylinder 1. A piston 6 is disposed at one end of the piston rod 2, and the other end of the piston rod 2 extends out of the hydraulic cylinder 1. A sealing ring 18 is provided on the outer periphery of the piston 6, and the sealing ring 18 contacts the inner wall of the hydraulic cylinder 1. The piston 6 divides the interior of the hydraulic cylinder 1 into a first pressure chamber 101 and a second pressure chamber 102. A first buffer 5 and a second buffer 7 are respectively disposed at both ends of the piston rod 2 and the piston 6. The first buffer 5 is located in the first pressure chamber 101, and the second buffer 7 is located in the second pressure chamber 102. Both the first buffer 5 and the second buffer 7 are provided with a buffer layer 14. The buffer layer 14 of the first buffer 5 contacts the open end of the hydraulic cylinder 1. The buffer layer 14 of the second buffer member 7 is in contact with the bottom end of the hydraulic cylinder body 1; both the first buffer member 5 and the second buffer member 7 are configured as frustum structures, which include a top surface, a bottom surface, and a side surface. The area of the top surface is smaller than the area of the bottom surface. The side of the frustum structure that connects to the piston 6 is the bottom surface. The buffer layer 14 is disposed on the side surface of the frustum. The inner wall of the open end of the hydraulic cylinder body 1 is provided with a first inclined surface 3, which is in contact with the buffer layer 14 of the first buffer member 5; the inner wall of the bottom end of the hydraulic cylinder body 1 is provided with a second inclined surface 9, which is in contact with the buffer layer 14 of the second buffer member 7; the piston 6 moves to the connection point between the first inclined surface 3 and the side surface of the hydraulic cylinder body when the piston rod 2 is fully extended; the piston 6 moves to the connection point between the first inclined surface 3 and the side surface of the hydraulic cylinder body when the piston rod 2 is fully retracted. The buffer layer 14 is made of rubber and has a buffer cavity 13 inside. Both the first buffer member 5 and the second buffer member 7 have flow channels 10 inside. The buffer cavity 13 has a flow port 11 connecting to the flow channel 10. The first buffer member 5 has a first fluid inlet 15, which is connected to the flow channel 10 inside the first buffer member 5. The second buffer member 7 has a second fluid inlet 16, which is connected to the flow channel 10 inside the second buffer member 7. The first buffer member 5 has a first spring 12, which passes through the flow port 11. 1. Entering the buffer chamber 13, one end of the first spring 12 is set on the first buffer member 5, and the other end of the first spring 12 contacts the inner wall of the buffer chamber 13; the second buffer member 7 is provided with a second spring 17, which passes through the flow port 11 and enters the buffer chamber 13, one end of the second spring 17 is set on the second buffer member 7, and the other end of the second spring 17 contacts the inner wall of the buffer chamber 13; the hydraulic cylinder body 1 is provided with a first oil port 4 and a second oil port 8, the first oil port 4 is set at the open end of the hydraulic cylinder body 1, and the second oil port 8 is set at the bottom end of the hydraulic cylinder body 1; the inner port of the first oil port 4 connects to the first fluid inlet 15 when the piston rod 2 is fully extended, and the inner port of the second oil port 8 connects to the second fluid inlet 16 when the piston rod 2 is fully retracted.
[0026] The specific working process and principle of this utility model are as follows: When the piston rod 2 extends, the buffer layer 14 of the first buffer member 5 first contacts the first inclined surface 3. At this time, the buffer layer 14 is made of rubber material and, combined with the elastic effect of the first spring 12, plays a buffering role. At the same time, the hydraulic oil in the buffer chamber 13 also plays a damping role, thereby reducing the movement speed of the piston rod 2, so that there will be no impact between the top surface of the frustum of the first buffer member 5 and the opening end of the hydraulic cylinder body 1. Similarly, when the piston rod 2 retracts, there will be no impact between the top surface of the frustum of the second buffer member 7 and the bottom end of the hydraulic cylinder. Therefore, the damage to the components is reduced and the service life is extended.
[0027] In the description of this utility model, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "other end", "upper", "side", "top", "inner", "front", "center", "both ends", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They 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. Therefore, they should not be construed as limitations on this utility model.
[0028] In this utility model, unless otherwise explicitly specified and limited, the terms "installation", "setting", "connection", "fixing", "screw connection", etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0029] The foregoing description illustrates and describes preferred embodiments of the present invention. As previously stated, it should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the inventive concept described herein through the foregoing teachings or related technical or knowledge. Any modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.
Claims
1. A piston rod structure with a buffer function, comprising a piston rod disposed inside a hydraulic cylinder body, a piston disposed at one end of the piston rod, and the other end of the piston rod extending out of the hydraulic cylinder body, wherein the piston divides the interior of the hydraulic cylinder body into a first pressure chamber and a second pressure chamber; characterized in that: The piston rod is provided with a first buffer and a second buffer at two ends of the piston respectively, the first buffer is located in the first pressure chamber, and the second buffer is located in the second pressure chamber; the first buffer and the second buffer are both provided with a buffer layer, the buffer layer of the first buffer is in contact with the open end of the hydraulic cylinder body, and the buffer layer of the second buffer is in contact with the bottom end of the hydraulic cylinder body. The buffer layer is made of rubber material, the buffer layer is internally provided with a buffer cavity, the first buffer and the second buffer are both internally provided with a flow channel, and the buffer cavity is provided with a flow port connected with the flow channel; the first buffer is provided with a first fluid inlet connected with the flow channel in the first buffer; and the second buffer is provided with a second fluid inlet connected with the flow channel in the second buffer.
2. Piston rod structure with a damping function according to claim 1, characterized in that The first buffer is provided with a first spring, the first spring passes through the flow port and enters the buffer cavity, one end of the first spring is arranged on the first buffer, and the other end of the first spring is in contact with the inner wall of the buffer cavity.
3. The piston rod structure with a buffering function according to claim 1, characterized in that: The second buffer is provided with a second spring, the second spring passes through the flow port and enters the buffer cavity, one end of the second spring is arranged on the second buffer, and the other end of the second spring is in contact with the inner wall of the buffer cavity.
4. The piston rod structure with a buffering function according to claim 1, characterized in that: The first buffer and the second buffer are both provided in a circular truncated cone structure, the circular truncated cone structure comprises a circular truncated cone top surface, a circular truncated cone bottom surface and a circular truncated cone side surface, the area of the circular truncated cone top surface is smaller than that of the circular truncated cone bottom surface, one side of the circular truncated cone structure connected with the piston is the circular truncated cone bottom surface, and the buffer layer is arranged on the circular truncated cone side surface; the inner wall of the open end of the hydraulic cylinder body is provided with a first inclined surface, the first inclined surface is in contact with the buffer layer of the first buffer; and the inner wall of the bottom end of the hydraulic cylinder body is provided with a second inclined surface, the second inclined surface is in contact with the buffer layer of the second buffer.
5. Piston rod structure with a damping function according to claim 4, characterized in that: The piston moves to the connection position of the first inclined surface and the side surface of the hydraulic cylinder body when the piston rod is fully extended.
6. The piston rod structure with a buffering function according to claim 4, characterized in that: The piston moves to the connection position of the second inclined surface and the side surface of the hydraulic cylinder body when the piston rod is fully retracted.
7. The piston rod structure with a buffering function according to claim 1, characterized in that: One first fluid inlet and one second fluid inlet are arranged.
8. Piston rod structure with a damping function according to claim 7, characterized in that The hydraulic cylinder body is provided with a first oil port and a second oil port, the first oil port is arranged at the open end of the hydraulic cylinder body, and the second oil port is arranged at the bottom end of the hydraulic cylinder body; the inner port of the first oil port is connected with the first fluid inlet when the piston rod is fully extended, and the inner port of the second oil port is connected with the second fluid inlet when the piston rod is fully retracted.
9. The piston rod structure with a buffering function according to claim 1, characterized in that: The outer periphery of the piston is provided with a sealing ring, and the sealing ring is in contact with the inner wall of the hydraulic cylinder body.