Piston pin with high sealing performance

Abstract

The utility model provides a high sealing piston pin which comprises a piston pin body, the piston pin body is fixedly connected in a pin hole formed in the piston pin body through a sealing layer, the end faces of the two ends of the piston pin body are symmetrically connected with extension plates, the outer side faces of the extension plates are fixedly connected with positioning rings, and the end face of the piston pin body is fixedly connected with a main fastening ring. The end face of the extension plate is movably connected with a limiting plate, the outer side face of the limiting plate is fixedly connected with a fixing plate, and the fixing plate is fixedly connected with the surface of the piston body through bolts. Through cooperation of the extension plate, the sealing layer, the fixing plate and the limiting plate, the sealing performance of the joint between the piston pin body and the piston body can be effectively enhanced.

Description

Technical Field

[0001] This utility model relates to the field of piston pin technology, specifically to a high-sealing piston pin. Background Technology

[0002] A piston pin is a cylindrical pin installed on the piston skirt. Its center passes through the connecting rod small end hole to connect the piston and connecting rod. Its function is to transmit the gas force on the piston to the connecting rod, or to make the connecting rod small end drive the piston to move together. In order to reduce weight, piston pins are generally made of high-quality alloy steel and are hollow. However, the structure of common piston pins on the market is relatively simple. Its body is a cylindrical pin tube, which has low sealing strength, resulting in gaps at the connection when used, making the piston pin unsuitable for use. Utility Model Content

[0003] To overcome the shortcomings of the existing technology, a high-sealing piston pin is provided to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, a high-sealing piston pin is provided, comprising: a piston pin body, wherein the piston pin body is fixedly connected to a pin hole opened in the piston body through a sealing layer, and the end faces of both ends of the piston pin body are symmetrically connected to extension plates, and the outer side of the extension plates is fixedly connected to a positioning ring, the end face of the piston pin body is fixedly connected to a main fastening ring, and the end face of the extension plates is movably connected to a limiting plate, the outer side of the limiting plate is fixedly connected to a fixing plate, and the fixing plate is fixedly connected to the surface of the piston body by bolts.

[0005] Preferably, the two sets of extension plates fixedly connected to the inner sides of the two end faces of the piston pin body are both cylindrical structures, and the inner diameter of the extension plate is matched with the inner diameter of the piston pin body, while the outer diameter of the extension plate is smaller than the outer diameter of the piston pin body.

[0006] Preferably, a set of main fastening rings is fixedly connected to the outer side of each end face of the piston pin body. Both sets of main fastening rings are circular ring structures, and the cross-section of the main fastening rings is semi-circular.

[0007] Preferably, a positioning ring is fixedly connected to the middle of the outer arc surface of the extension plate. The positioning ring has a circular structure and a semi-circular cross-section. The width of the positioning ring is smaller than the width of the main fastening ring.

[0008] Preferably, the sealing layer has a cylindrical structure, an L-shaped axial section, and an outer arc surface at the embedded end of the sealing layer with a frustum-shaped structure. A positioning groove is provided on the inner side of the tail end of the sealing layer relative to the positioning ring. The dimensions of the positioning groove and the positioning ring are compatible, and the dimensions of the inner side of the tail end of the sealing layer are compatible with the dimensions of the outer side of the extension plate.

[0009] Preferably, the limiting plate has a circular ring structure, the axial section of the limiting plate has an L-shaped structure, and the fixing plate fixedly connected to the outer arc surface of the limiting plate has a circular ring structure. The axial section formed by the combination of the limiting plate and the fixing plate has a Z-shaped structure, and the size of the inner cavity of the limiting plate is adapted to the size of the outer side of the extension plate.

[0010] Preferably, four sets of fixing holes are equally spaced around the surface of the fixing plate in the circumferential direction. The axial section of the four sets of fixing holes has a convex shape. Screw holes are opened on the surface of the piston body relative to the fixing holes. A sealing gasket is fixedly connected to the side of the fixing plate surface close to the piston body. The sealing gasket has a circular structure. At the same time, the size of the opening at both ends of the pin hole is adapted to the size of the assembly formed by the sealing layer and the fixing plate.

[0011] Compared with the prior art, the beneficial effects of this utility model are: through the cooperation of the extension plate, main fastening ring, positioning ring, sealing layer, limiting plate, fixing plate and sealing gasket, the two ends of the piston pin body can have multiple sealing structures, thereby effectively enhancing the sealing performance of the connection between the piston pin body and the piston body, and enhancing the performance of the piston pin body. Attached Figure Description

[0012] Figure 1 This is a front view schematic diagram of an embodiment of the present utility model.

[0013] Figure 2 This is a partial disassembled schematic diagram of the piston pin body according to an embodiment of the present utility model.

[0014] Figure 3 This is a front view of the limiting plate and fixing plate according to an embodiment of the present utility model.

[0015] Figure 4 This is an embodiment of the present utility model. Figure 1 Enlarged diagram of point A.

[0016] In the diagram: 1. Piston body; 2. Piston pin body; 3. Extension plate; 4. Limiting plate; 5. Sealing layer; 6. Main fastening ring; 7. Sealing gasket; 8. Positioning ring; 9. Fixing plate; 10. Pin hole. Detailed Implementation

[0017] The technical solutions of the present utility model 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 utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Reference Figures 1 to 4As shown, this utility model provides a high-sealing piston pin, including: a piston pin body 2, the piston pin body 2 is fixedly connected to the pin hole 10 opened in the piston body 1 through a sealing layer 5, and the end faces of both ends of the piston pin body 2 are symmetrically connected to an extension plate 3, while the outer side of the extension plate 3 is fixedly connected to a positioning ring 8, the end face of the piston pin body 2 is fixedly connected to a main fastening ring 6, and the end face of the extension plate 3 is movably connected to a limiting plate 4, the outer side of the limiting plate 4 is fixedly connected to a fixing plate 9, and the fixing plate 9 is fixedly connected to the surface of the piston body 1 by bolts.

[0019] In this embodiment, the piston pin body 2 is first embedded into the pin hole 10 opened in the piston body 1. Then, two sets of sealing layers 5 are sleeved on both ends of the piston pin body 2, and the embedded end of the sealing layer 5 will be simultaneously embedded into the pin hole 10, thereby helping to enhance the sealing performance of the connection between the piston body 1 and the piston pin body 2. The positioning ring 8 provided on the outer side of the extension plate 3 can be embedded into the positioning groove opened at the tail end of the sealing layer 5, thereby realizing the fixed connection between the piston pin body 2, the extension plate 3 and the sealing layer 5. Then, two sets of limiting plates 4 are respectively sleeved on the extension plates 3 at both ends of the piston pin body 2, and the fixing plate 9 is fixedly connected to the piston body 1 by bolts. Then, the fixing plate 9 can squeeze the sealing gasket 7 and the sealing layer 5, and the main fastening ring 6 will also simultaneously squeeze the inner side of the sealing layer 5, thereby further enhancing the sealing performance and the stability of the fixed connection between the piston pin body 2 and the piston body 1.

[0020] In a preferred embodiment, the two sets of extension plates 3 fixedly connected to the inner sides of the two end faces of the piston pin body 2 are both cylindrical structures, and the inner diameter of the extension plate 3 is matched with the inner diameter of the piston pin body 2, while the outer diameter of the extension plate 3 is smaller than the outer diameter of the piston pin body 2.

[0021] In this embodiment, as Figure 1 , Figure 2 and Figure 4 The size of the extension plate 3 helps to reduce the overall weight of the piston pin and facilitates the subsequent connection and fixation of the sealing layer 5 and the limiting plate 4. Both the piston pin body 2 and the extension plate 3 are made of high-grade alloy steel.

[0022] In a preferred embodiment, a set of main fastening rings 6 are fixedly connected to the outer side of both end faces of the piston pin body 2. Both sets of main fastening rings 6 are annular structures, and the cross-section of the main fastening rings 6 is semi-circular.

[0023] In this embodiment, as Figure 1 , Figure 2 and Figure 4 The main fastening ring 6 can enhance the sealing performance of the contact surface between the piston pin body 2 end face and the sealing layer 5 when the sealing layer 5 is sleeved, thereby enhancing the overall sealing performance of the piston pin.

[0024] In a preferred embodiment, a positioning ring 8 is fixedly connected to the middle of the outer arc surface of the extension plate 3. The positioning ring 8 has a circular structure and a semi-circular cross-section. The ring width of the positioning ring 8 is smaller than the ring width of the main fastening ring 6.

[0025] In this embodiment, as Figure 1 , Figure 2 and Figure 4 The positioning ring 8 and the positioning groove at the tail end of the sealing layer 5 are matched in size, so that when the sealing layer 5 is sleeved, the sealing layer 5 and the extension plate 3 can be fixedly connected, ensuring that the sealing layer 5 can be stably sleeved on both ends of the piston pin body 2, and also helping to enhance the sealing performance at the connection between the sealing layer 5 and the extension plate 3.

[0026] In a preferred embodiment, the sealing layer 5 has a cylindrical structure, the axial section of the sealing layer 5 has an L-shaped structure, and the outer arc surface of the embedded end of the sealing layer 5 has a frustum-shaped structure. The inner side of the tail end of the sealing layer 5 is provided with a positioning groove corresponding to the position of the positioning ring 8. The dimensions of the positioning groove and the positioning ring 8 are compatible, and the dimensions of the inner side of the tail end of the sealing layer 5 are compatible with the dimensions of the outer side of the extension plate 3.

[0027] In this embodiment, as Figure 1 , Figure 2 and Figure 4 The inclined structure on the outer side of the embedded end of the sealing layer 5 can not only help reduce the difficulty of embedding the pin hole 10, but also help enhance the sealing performance after the sealing layer 5 is embedded. At the same time, the size of the inner cavity of the embedded end of the sealing layer 5 is larger than the size of the inner cavity of the tail end of the sealing layer 5. Therefore, the sealing layer 5 can be sleeved on the piston pin body 2 and the extension plate 3 respectively, enhancing the sealing performance at the contact surface of the three.

[0028] In a preferred embodiment, the limiting plate 4 has a circular ring structure, the axial section of the limiting plate 4 has an L-shaped structure, and the fixing plate 9 fixedly connected to the outer arc surface of the limiting plate 4 has a circular ring structure. The axial section formed by the combination of the limiting plate 4 and the fixing plate 9 has a Z-shaped structure. At the same time, the size of the inner cavity of the limiting plate 4 is adapted to the size of the outer side of the extension plate 3.

[0029] In this embodiment, as Figure 1 , Figure 2 and Figure 4 The dimensions of the inner cavity of the limiting plate 4 are matched with the dimensions of the outer side of the extension plate 3, which helps to enhance the sealing between the two after the limiting plate 4 is sleeved on the end face of the extension plate 3. It can also effectively limit the movement range of the piston pin body 2 through the cooperation of the fixing plate 9, and enhance the stability of the connection between the piston pin body 2 and the piston body 1.

[0030] In a preferred embodiment, four sets of fixing holes are equally spaced around the surface of the fixing plate 9. The axial section of the four sets of fixing holes has a convex shape. Screw holes are opened on the surface of the piston body 1 corresponding to the fixing holes. A sealing gasket 7 is fixedly connected to the side of the fixing plate 9 closest to the piston body 1. The sealing gasket 7 has a circular structure. At the same time, the size of the openings at both ends of the pin hole 10 is adapted to the size of the assembly formed by the sealing layer 5 and the fixing plate 9.

[0031] In this embodiment, as Figure 2 , Figure 3 and Figure 4 Both the fixing plate 9 and the limiting plate 4 are made of high-grade alloy steel. The sealing gasket 7 set on the fixing plate 9 can simultaneously enhance the sealing performance of the connection between the fixing plate 9 and the piston body 1 when the fixing plate 9 is fixedly connected to the surface of the piston body 1. Thus, through the multiple sealing structure, the overall sealing performance of the piston pin is effectively enhanced.

[0032] 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 high-sealability piston pin comprising: The piston pin body (2) is characterized in that: the piston pin body (2) is fixedly connected to the pin hole (10) opened in the piston body (1) through the sealing layer (5), and the end faces of both ends of the piston pin body (2) are symmetrically connected to the extension plate (3), and the outer side of the extension plate (3) is fixedly connected to the positioning ring (8), the end face of the piston pin body (2) is fixedly connected to the main fastening ring (6), and the end face of the extension plate (3) is movably connected to the limiting plate (4), the outer side of the limiting plate (4) is fixedly connected to the fixing plate (9), and the fixing plate (9) is fixedly connected to the surface of the piston body (1) by bolts.

2. A high sealing piston pin according to claim 1, characterized in that The two sets of extension plates (3) fixedly connected to the inner sides of the two end faces of the piston pin body (2) are both cylindrical structures, and the inner diameter of the extension plate (3) is matched with the inner diameter of the piston pin body (2), while the outer diameter of the extension plate (3) is smaller than the outer diameter of the piston pin body (2).

3. A high sealing piston pin according to claim 1, characterized in that A set of main fastening rings (6) are fixedly connected to the outer side of both ends of the piston pin body (2). Both sets of main fastening rings (6) are circular ring structures, and the cross section of the main fastening rings (6) is semi-circular.

4. A high sealing piston pin according to claim 1, characterized in that The positioning ring (8) is fixedly connected to the middle of the outer arc surface of the extension plate (3). The positioning ring (8) has a circular structure and a semi-circular cross-section. The ring width of the positioning ring (8) is smaller than the ring width of the main fastening ring (6).

5. A high sealing piston pin according to claim 1, characterized in that The sealing layer (5) has a cylindrical structure, the axial section of the sealing layer (5) has an L-shaped structure, and the outer arc surface of the embedded end of the sealing layer (5) has a frustum-shaped structure. The inner side of the tail end of the sealing layer (5) is provided with a positioning groove corresponding to the position of the positioning ring (8). The dimensions of the positioning groove and the positioning ring (8) are compatible. At the same time, the dimensions of the inner side of the tail end of the sealing layer (5) are compatible with the dimensions of the outer side of the extension plate (3).

6. A high sealing piston pin according to claim 1, characterized in that The limiting plate (4) has a circular ring structure, the axial section of the limiting plate (4) has an L-shaped structure, and the fixing plate (9) fixedly connected to the outer arc surface of the limiting plate (4) has a circular ring structure. The axial section formed by the combination of the limiting plate (4) and the fixing plate (9) has a Z-shaped structure. At the same time, the size of the inner cavity of the limiting plate (4) is compatible with the size of the outer side of the extension plate (3).

7. A high sealing piston pin according to claim 1, characterized in that The surface of the fixing plate (9) has four sets of fixing holes at equal intervals around the circumference. The axial section of the four sets of fixing holes is convex. The surface of the piston body (1) has screw holes corresponding to the positions of the fixing holes. The sealing gasket (7) is fixedly connected to the side of the fixing plate (9) close to the piston body (1). The sealing gasket (7) is annular. At the same time, the size of the openings at both ends of the pin hole (10) is compatible with the size of the assembly formed by the sealing layer (5) and the fixing plate (9).

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