A piston rod assembly

Abstract

This utility model discloses a piston rod assembly, relating to the technical field of piston rods. It includes a rod body with a first threaded portion and a second threaded portion at one end; a first limiting seat threadedly engaged with the first threaded portion, coaxially arranged with the rod body, and a first limiting ring protruding radially from the first limiting seat; a second limiting seat threadedly engaged with the second threaded portion, coaxially arranged with the rod body, and abutting against the side of the first limiting seat opposite to the rod body, and a second limiting ring protruding radially from the second limiting seat; and a piston, which is annular in shape, coaxially sleeved around both the first and second limiting seats, with the first and second limiting rings abutting against opposite sides of the piston. This utility model facilitates the connection and disassembly of the piston and rod body, while simultaneously improving the overall structural strength of the piston rod assembly, adapting to high-load operating conditions.

Description

Technical Field

[0001] This utility model relates to the technical field of piston rods, and in particular to a piston rod assembly. Background Technology

[0002] Piston rods are used in pressure-driven actuators such as cylinders and hydraulic cylinders, or in buffer components such as gas springs and shock absorbers. Specifically, one end of the piston rod is connected to a piston, which is sealed and slidably disposed within the cylinder body; the end of the piston rod away from the piston extends out of the cylinder body as the driving end.

[0003] In existing technology, the piston is fixedly connected to one end of the piston rod body, specifically through connecting parts such as screws and pins. Chinese utility model patent CN219299671U discloses a cylinder piston rod assembly in which the piston is coaxially fixed to the rod body by a single axially aligned fastening bolt. While this method facilitates the connection and disassembly of the piston and rod body, the connection structure between them relies solely on a single fastening bolt, limiting the overall structural strength of the piston rod assembly and making it unsuitable for some high-load applications. Utility Model Content

[0004] The purpose of this invention is to provide a piston rod assembly that facilitates the connection and disassembly of the piston and rod, while improving the overall structural strength of the piston rod assembly and adapting to high-load working conditions.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution: This utility model provides a piston rod assembly, the piston rod assembly comprising: A rod body, one end of which is provided with a first threaded portion and a second threaded portion; The first limiting seat is threadedly fitted to the first threaded portion, and the first limiting seat is coaxially arranged with the rod body. The first limiting seat has a first limiting ring protruding radially. The second limiting seat is threadedly fitted to the second threaded portion. The second limiting seat is coaxially arranged with the rod body, and the second limiting seat abuts against the side of the first limiting seat away from the rod body. The second limiting seat has a second limiting ring protruding radially. The piston is annular in shape and is coaxially sleeved outside the first limiting seat and the second limiting seat. The first limiting ring and the second limiting ring abut against the opposite sides of the piston.

[0006] Furthermore, the end of the rod body is provided with a first protruding post along the axial direction, the first threaded portion includes an external thread provided on the outer periphery of the first protruding post, and the first limiting seat is provided with a first threaded hole along the axial direction that mates with the external thread of the first protruding post.

[0007] Furthermore, the first protrusion is coaxially arranged with the rod body, the diameter of the first protrusion is smaller than the diameter of the end of the rod body, and the first limiting ring abuts against the end of the rod body.

[0008] Furthermore, the first protrusion is provided with a second protrusion along the axial direction, the second threaded portion includes an external thread disposed on the outer periphery of the second protrusion, and the second limiting seat is provided with a second threaded hole along the axial direction that mates with the external thread of the second protrusion.

[0009] Furthermore, the second protrusion is coaxially arranged with the first protrusion, the diameter of the second protrusion is smaller than the diameter of the first protrusion, and the side of the first limiting seat facing the second limiting seat abuts against the end of the first protrusion.

[0010] Furthermore, a first chamfer is provided on the side edge of the first threaded hole facing the rod body.

[0011] Furthermore, the second threaded hole has a second chamfer on the side edge facing the first protrusion.

[0012] Furthermore, the first protrusion has a connecting hole along the axial direction, and the second threaded portion includes an internal thread disposed on the inner wall of the connecting hole, and the connecting hole is coaxially disposed with the first protrusion; the second limiting seat has a third protrusion protruding along the axial direction, and the third protrusion is provided with an external thread that mates with the internal thread of the connecting hole.

[0013] Furthermore, the first limiting ring and the first limiting seat are integrally formed, and the first threaded hole passes through the first limiting ring.

[0014] Furthermore, the second limiting ring and the second limiting seat are integrally formed, and the side of the second threaded hole opposite to the first limiting seat is closed.

[0015] In summary, this utility model has the following beneficial effects: 1. In the piston rod assembly of this utility model, the first limiting seat and the second limiting seat are respectively threaded onto the first threaded portion and the second threaded portion of the rod body, realizing the connection between the first limiting seat, the second limiting seat and the rod body. The piston is sleeved on the outside of the first limiting seat and the second limiting seat, and the piston is axially limited on both sides by the radially protruding first limiting ring and the second limiting ring. When installing the piston on the rod body, the first limiting seat is first threaded onto the rod body, then the piston is sleeved on the outside of the first limiting seat, and then the second limiting seat is threaded onto the second threaded portion of the rod body. The second limiting seat passes through the inner ring of the piston. During the process of screwing the second limiting seat, the first limiting ring and the second limiting ring clamp the piston, making the piston assembly tight. This facilitates the connection and assembly of the piston and the rod. At the same time, the first and second limiting seats are firmly connected to the rod. The piston is radially limited by the circumferential side of the first and second limiting seats, and axially limited by the end faces of the first and second limiting rings. This increases the contact area when the piston and the rod are connected, enhances the overall structural strength of the piston rod assembly, and makes the piston rod assembly suitable for high-load working conditions.

[0016] 2. In some embodiments, the first threaded portion includes an external thread disposed on the outer periphery of the first protrusion, and the second threaded portion includes an external thread disposed on the outer periphery of the second protrusion. This arrangement of external threads facilitates the one-time milling and turning of the first threaded portion and the second threaded portion at the end of the rod, which helps to ensure the coaxiality of the first threaded portion and the second threaded portion, thereby ensuring the coaxiality of the first limiting seat, the second limiting seat and the rod after connection.

[0017] 3. The first protrusion is coaxially arranged with the rod body, and the diameter of the first protrusion is smaller than the diameter of the end of the rod body, so that a step is formed at the connection between the first protrusion and the end of the rod body; when the first limiting seat is connected to the rod body, the first limiting part is engaged at the step and the first limiting ring abuts against the end of the rod body, so that the axial stress of the piston, the first limiting seat, the first limiting ring and the rod body is not only borne by the thread, reducing the probability of thread failure of the first threaded part and the first threaded hole.

[0018] 4. The second protrusion is coaxially arranged with the first protrusion, and the diameter of the second protrusion is smaller than that of the first protrusion, so that a step is formed at the connection between the second protrusion and the first protrusion; when the second limiting seat is threadedly engaged with the second protrusion, the second limiting seat is engaged at this step, and the end of the second limiting seat abuts against the first protrusion. Thus, the first protrusion axially limits the second limiting seat, so that the axial stress of the piston, the second limiting seat, the second limiting ring and the first protrusion is not only borne by the thread, reducing the probability of thread failure of the second threaded part and the second threaded hole.

[0019] 5. A first chamfer is provided on the edge of the first threaded hole to guide the first protrusion when it is inserted into the first threaded hole, and to prevent stress concentration and breakage at the edge of the first threaded hole.

[0020] 6. A second chamfer is provided on the edge of the second threaded hole to guide the second protrusion when it is inserted into the second threaded hole, and to prevent stress concentration and breakage at the edge of the second threaded hole.

[0021] 7. In some embodiments, the second threaded portion is the internal thread of the connecting hole. This configuration eliminates the need for a second protruding post, reducing the overall length of the rod.

[0022] 8. The first limiting ring and the first limiting seat are integrally formed, as are the second limiting ring and the second limiting seat, thereby improving the connection strength between the first limiting seat and the first limiting ring, and the second limiting seat and the second limiting ring. The first threaded hole penetrates the first limiting ring to facilitate the insertion of the first protrusion into the first threaded hole; the side of the second threaded hole away from the first limiting seat is closed to prevent foreign objects from entering the second threaded hole, while the second protrusion can abut against the bottom wall of the second threaded hole, further enhancing the structural strength of the piston rod assembly. Attached Figure Description

[0023] Figure 1 This is a three-dimensional structural schematic diagram of the piston rod assembly of Embodiment 1 of this utility model.

[0024] Figure 2 This is an exploded structural diagram of the piston rod assembly of Embodiment 1 of this utility model.

[0025] Figure 3 This is a vertical cross-sectional structural diagram of the piston rod assembly of Embodiment 1 of this utility model.

[0026] Figure 4 This is a three-dimensional structural diagram of the first limiting seat and the first limiting ring of Embodiment 1 of this utility model.

[0027] Figure 5 This is a three-dimensional structural diagram of the second limiting seat and the second limiting ring of Embodiment 1 of this utility model.

[0028] Figure 6 This is an exploded view of the piston rod assembly of Embodiment 2 of this utility model.

[0029] Figure 7 This is a vertical cross-sectional structural diagram of the piston rod assembly of Embodiment 2 of this utility model.

[0030] Figure 8 This is a three-dimensional structural diagram of the rod and the first protruding post in Embodiment 2 of this utility model.

[0031] In the picture: 1000, Piston rod assembly; 100, Rod body; 110, First threaded portion; 120, Second threaded portion; 130, First protrusion; 140, Second protrusion; 150, Connecting hole; 200, First limiting seat; 210, First threaded hole; 211, First chamfer; 300, Second limiting seat; 310, Second threaded hole; 311, Second chamfer; 320, Third protrusion; 400, Piston; 500, First limiting ring; 600, Second limiting ring. Detailed Implementation

[0032] The present invention will be further described below with reference to the accompanying drawings.

[0033] Example 1 This embodiment discloses a piston rod assembly 1000, with reference to... Figure 1 and Figure 2 The piston rod assembly 1000 includes a rod body 100, a first limiting seat 200, a second limiting seat 300, and a piston 400. The first limiting seat 200 and the second limiting seat 300 are fixedly connected to the rod body 100, and the piston 400 is sleeved outside the first limiting seat 200 and the second limiting seat 300.

[0034] Reference Figures 1 to 3 The rod 100 is a cylindrical component. One end of the rod 100 is disposed inside the cylinder of a pneumatic or hydraulic cylinder and connected to the piston 400. The other end of the rod 100 extends out of the cylinder and is connected to the mechanism to be driven. The end of the rod 100 disposed inside the cylinder is provided with a first threaded portion 110 and a second threaded portion 120. A first limiting seat 200 is threadedly engaged with the first threaded portion 110, and a second limiting seat 300 is threadedly engaged with the second threaded portion 120.

[0035] In this embodiment, the first limiting seat 200 is cylindrical in shape and is coaxially arranged with the rod 100. A first limiting ring 500 is radially protruding from one end of the first limiting seat 200 facing the rod 100. The second limiting seat 300 is cylindrical and coaxially arranged with the rod 100. The second limiting seat 300 abuts against the side of the first limiting seat 200 away from the rod 100. A second limiting ring 600 is radially protruding from one end of the second limiting seat 300 facing the first limiting seat 200.

[0036] In this embodiment, the piston 400 is annular and is coaxially sleeved outside the first limiting seat 200 and the second limiting seat 300. The first limiting ring 500 and the second limiting ring 600 abut against the opposite sides of the piston 400. The first limiting ring 500 and the second limiting ring 600, which are radially protruding, axially limit the piston 400 on both sides.

[0037] When installing the piston 400 on the rod 100, firstly, the first limiting seat 200 is threaded to the rod 100, then the piston 400 is sleeved on the outside of the first limiting seat 200, and then the second limiting seat 300 is threaded into the second threaded part 120 of the rod 100. The second limiting seat 300 is inserted into the inner ring of the piston 400. During the process of screwing the second limiting part, the first limiting ring 500 and the second limiting ring 600 clamp the piston 400, so that the piston 400 is tightly assembled. This facilitates the connection and assembly of the piston 400 and the rod 100. At the same time, the first limiting seat 200 and the second limiting seat 300 are firmly connected to the rod 100. The piston 400 is radially limited by the first limiting seat 200 and the second limiting seat 300, and axially limited by the end faces of the first limiting ring 500 and the second limiting ring 600. This increases the contact area when the piston 400 is connected to the rod 100, enhances the overall structural strength of the piston rod assembly 1000, and makes the piston rod assembly 1000 suitable for high-load working conditions.

[0038] Reference Figure 2 and Figure 3 In this embodiment, a first protruding post 130 is provided axially at the end of the rod 100. The first protruding post 130 is cylindrical, and the first threaded portion 110 includes an external thread provided on the outer periphery of the first protruding post 130. Correspondingly, a first limiting seat 200 is provided axially with a first threaded hole 210, which penetrates the first limiting seat 200 and engages with the external thread of the first protruding post 130.

[0039] In this embodiment, the first protrusion 130 is provided with a second protrusion 140 along the axial direction. The second protrusion 140 is cylindrical, and the second threaded portion 120 includes an external thread provided on the outer periphery of the second protrusion 140. The second limiting seat 300 is provided with a second threaded hole 310 along the axial direction that mates with the external thread of the second protrusion 140.

[0040] In this embodiment, a first protrusion 130 and a second protrusion 140 are provided, and external threads are provided on the outer periphery of the first protrusion 130 and the second protrusion 140 to connect the first limiting seat 200 and the second limiting seat 300. This method of providing external threads facilitates the one-time milling and turning of the first threaded portion 110 and the second threaded portion 120 at the end of the rod body 100, which helps to ensure the coaxiality of the first threaded portion 110 and the second threaded portion 120, thereby ensuring the coaxiality of the first limiting seat 200, the second limiting seat 300 and the rod body 100 after connection.

[0041] In this embodiment, the first protrusion 130 is coaxially arranged with the rod 100, and the diameter of the first protrusion 130 is smaller than the diameter of the end of the rod 100, thereby forming a step at the connection between the first protrusion 130 and the end of the rod 100. When the first limiting seat 200 is connected to the rod 100, the first limiting part cooperates at the step and the first limiting ring 500 abuts against the end of the rod 100, thereby ensuring that the axial stress of the piston 400, the first limiting seat 200, the first limiting ring 500 and the rod 100 is not only borne by the threads, reducing the probability of thread failure of the first threaded part 110 and the first threaded hole 210.

[0042] In this embodiment, the second protrusion 140 is coaxially arranged with the first protrusion 130, and the diameter of the second protrusion 140 is smaller than the diameter of the first protrusion 130, so that a step is formed at the connection between the second protrusion 140 and the first protrusion 130. When the second limiting seat 300 is threadedly engaged with the second protrusion 140, the second limiting seat 300 is engaged at the step, and the end of the second limiting seat 300 abuts against the end face of the first protrusion 130. Thus, the first protrusion 130 axially limits the second limiting seat 300, so that the axial stress of the piston 400, the second limiting seat 300, the second limiting ring 600 and the first protrusion 130 is not only borne by the thread, reducing the probability of thread failure of the second threaded part 120 and the second threaded hole 310.

[0043] In this embodiment, the first limiting ring 500 is integrally formed with the first limiting seat 200, and the second limiting ring 600 is integrally formed with the second limiting seat 300, thereby improving the connection strength between the first limiting seat 200 and the first limiting ring 500, the second limiting seat 300 and the second limiting ring 600. Furthermore, in other embodiments, the first limiting ring 500 and the second limiting ring 600 may also be welded to the first limiting seat 200 and the second limiting seat 300.

[0044] In this embodiment, the first threaded hole 210 passes through the first limiting ring 500 so that the first protrusion 130 can be inserted into the first threaded hole 210. The first threaded hole 210 passes through the side of the first limiting seat 200 facing the second limiting seat 300 so as to expose the second protrusion 140 and facilitate the connection between the second limiting seat 300 and the second protrusion 140.

[0045] In this embodiment, the side of the second threaded hole 310 opposite to the first limiting seat 200 is closed to prevent debris from entering the second threaded hole 310. Simultaneously, the second protrusion 140 can abut against the bottom wall of the second threaded hole 310, further enhancing the structural strength of the piston rod assembly 1000. Furthermore, in other embodiments, the second threaded hole 310 may also penetrate the side of the second limiting seat 300 opposite to the first limiting seat 200, forming an open opening.

[0046] In this embodiment, the outer diameters of the first limiting seat 200 and the second limiting seat 300 are the same, so that the outer peripheral surfaces of the first limiting seat 200 and the second limiting seat 300 are flush, so that the piston 400 can be stably sleeved on the first limiting seat 200 and the second limiting seat 300.

[0047] In this embodiment, two pistons 400 are provided. The two pistons 400 are the same size and are respectively fitted onto the first limiting seat 200 and the second limiting seat 300, which facilitates the assembly of the pistons 400. In addition, in other embodiments, the number of pistons 400 can also be set to other suitable numbers.

[0048] Reference Figures 2 to 5 In this embodiment, a first chamfer 211 is provided on the side edge of the first threaded hole 210 facing the rod body 100, so as to guide the first protrusion 130 when it is inserted into the first threaded hole 210, and at the same time to avoid stress concentration and breakage at the edge of the first threaded hole 210. A second chamfer 311 is provided on the side edge of the second threaded hole 310 facing the first protrusion 130, so as to guide the second protrusion 140 when it is inserted into the second threaded hole 310, and at the same time to avoid stress concentration and breakage at the edge of the second threaded hole 310. Preferably, the end edges of the first protrusion 130 and the second protrusion 140 are also provided with chamfers to avoid stress concentration and breakage during assembly.

[0049] Example 2 This embodiment discloses a piston rod assembly 1000, which is substantially the same as the piston rod assembly 1000 in Embodiment 1, except that: Reference Figures 6 to 8 In this embodiment, the first protrusion 130 has a connecting hole 150 along the axial direction, and the connecting hole 150 is coaxially arranged with the first protrusion 130. The second threaded portion 120 includes an internal thread provided on the inner wall of the connecting hole 150. Correspondingly, the second limiting seat 300 has a third protrusion 320 protruding along the axial direction, and the third protrusion 320 is coaxially connected with the second limiting seat 300. The third protrusion 320 is cylindrical and has an external thread that mates with the internal thread of the connecting hole 150. When assembling the piston rod assembly 1000, the first limiting seat 200 first mates with the first threaded portion 110, then the piston 400 is sleeved on the outside of the first limiting seat 200 and the second limiting seat 300, and the third protrusion 320 is inserted into the connecting hole 150 and threadedly engaged with the connecting hole 150. This embodiment eliminates the need for a second protrusion 140 at the end of the first protrusion 130, reducing the overall length of the rod 100 and thus reducing the cost of the rod 100.

[0050] The above description is only a preferred embodiment of the present utility model. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of the present utility model patent application are included in the scope of the present utility model patent application.

Claims

1. A piston rod assembly, characterized in that, The piston rod assembly (1000) includes: A rod body (100), one end of which is provided with a first threaded portion (110) and a second threaded portion (120); The first limiting seat (200) is threadedly fitted to the first threaded portion (110). The first limiting seat (200) is coaxially arranged with the rod body (100). The first limiting seat (200) is radially provided with a first limiting ring (500). The second limiting seat (300) is threadedly engaged with the second threaded portion (120). The second limiting seat (300) is coaxially arranged with the rod body (100), and the second limiting seat (300) abuts against the side of the first limiting seat (200) away from the rod body (100). The second limiting seat (300) is radially protruding with a second limiting ring (600). The piston (400) is annular and is coaxially sleeved on the outside of the first limiting seat (200) and the second limiting seat (300). The first limiting ring (500) and the second limiting ring (600) abut against the opposite sides of the piston (400).

2. The piston rod assembly as described in claim 1, characterized in that, The end of the rod (100) is provided with a first protruding post (130) along the axial direction. The first threaded part (110) includes an external thread provided on the outer periphery of the first protruding post (130). The first limiting seat (200) is provided with a first threaded hole (210) along the axial direction that mates with the external thread of the first protruding post (130).

3. A piston rod assembly as described in claim 2, characterized in that, The first protrusion (130) is coaxially arranged with the rod (100), the diameter of the first protrusion (130) is smaller than the diameter of the end of the rod (100), and the first limiting ring (500) abuts against the end of the rod (100).

4. A piston rod assembly as described in claim 2, characterized in that, The first protrusion (130) has a second protrusion (140) protruding along the axial direction. The second threaded portion (120) includes an external thread disposed on the outer periphery of the second protrusion (140). The second limiting seat (300) has a second threaded hole (310) that mates with the external thread of the second protrusion (140) along the axial direction.

5. A piston rod assembly as described in claim 4, characterized in that, The second protrusion (140) is coaxially arranged with the first protrusion (130), the diameter of the second protrusion (140) is smaller than the diameter of the first protrusion (130), and the side of the first limiting seat (200) facing the second limiting seat (300) abuts against the end of the first protrusion (130).

6. A piston rod assembly as described in claim 2, characterized in that, The first threaded hole (210) has a first chamfer (211) on the side edge facing the rod (100).

7. A piston rod assembly as described in claim 4, characterized in that, The second threaded hole (310) has a second chamfer (311) on the side edge facing the first protrusion (130).

8. A piston rod assembly as described in claim 2, characterized in that, The first protruding post (130) has a connecting hole (150) along the axial direction, and the second threaded part (120) includes an internal thread provided on the inner wall of the connecting hole (150). The connecting hole (150) is coaxially arranged with the first protruding post (130). The second limiting seat (300) has a third protruding post (320) protruding along the axial direction. The third protruding post (320) is provided with an external thread that mates with the internal thread of the connecting hole (150).

9. A piston rod assembly as described in claim 2, characterized in that, The first limiting ring (500) and the first limiting seat (200) are integrally formed, and the first threaded hole (210) passes through the first limiting ring (500).

10. A piston rod assembly as claimed in claim 4, characterized in that, The second limiting ring (600) and the second limiting seat (300) are integrally formed, and the second threaded hole (310) is closed on the side opposite to the first limiting seat (200).

Images