Automobile piston convenient for mounting snap spring

Abstract

The utility model discloses an automobile piston convenient to install a snap spring, and relates to the technical field of automobile pistons, the automobile piston comprises a piston body, the inner wall of the piston body is provided with a reinforcing part, the surface of the piston body is provided with a pin shaft insertion hole penetrating through the reinforcing part, the inner wall of the pin shaft insertion hole is provided with a snap spring groove, and the snap spring groove is provided with a snap spring. Chamfering grooves are formed in the two ends of the pin shaft inserting hole and located in the surface of the piston body. Due to the arrangement of the preassembling groove, in the piston production process, the clamping spring is preassembled into the retention groove at the upper end of the preassembling groove, during formal installation, the clamping spring only needs to be pushed out of the retention groove, the clamping spring can slide into the clamping spring groove along the guide groove in the stretching process under the action of the elasticity of the clamping spring, and the clamping spring can slide into the clamping spring groove along the guide groove under the action of the elasticity of the clamping spring. The clamping spring is fixed into the clamping spring groove to limit the piston pin shaft, axial movement of the piston pin shaft is avoided, in the installation process, the clamping spring is not prone to popping out, meanwhile, installation can be completed only by pushing the clamping spring out of the retention groove, installation is more convenient, and use is more convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of automotive pistons, and particularly relates to an automotive piston facilitating the installation of a snap ring. Background Technique

[0002] An automotive piston is a key component in an automotive engine. Its main body shape is usually cylindrical, and its top is generally concave or designed with a special shape to adapt to the shape of the combustion chamber, facilitating the compression and combustion of the air-fuel mixture. The side is relatively smooth and closely fits with the cylinder wall, moving up and down within the cylinder. The diameter of the piston is slightly smaller than the inner diameter of the cylinder to ensure an appropriate gap during operation while also ensuring good sealing performance. It is generally made of high-strength materials such as aluminum alloy. Aluminum alloy has the advantages of light weight, high strength, and good thermal conductivity, and can withstand the high temperature, high pressure, and huge impact forces generated during engine operation. The automotive piston is one of the key components that converts the thermal energy generated by fuel combustion into mechanical energy. In the working cycle of the engine, the piston moves up and down within the cylinder, transmits force to the connecting rod through the piston pin, and then drives the crankshaft to rotate. The movement of the piston converts the gas pressure in the combustion chamber into the rotational power of the crankshaft, driving the vehicle to move forward.

[0003] Currently, when installing an automotive piston, the piston pin needs to be inserted into the pin hole of the piston to ensure that the connecting parts of the piston pin, piston, and connecting rod are aligned. Then, the snap ring is placed into a special installation tool, such as a snap ring pliers. The snap ring pliers can open the snap ring to increase its inner diameter and install it on the piston. Next, the opened snap ring is aligned with the snap ring grooves at both ends of the piston pin hole, and the snap ring pliers are slowly released, allowing the snap ring to contract under its own elasticity and snap into the snap ring groove. However, this installation method requires holding a specific snap ring pliers for installation, and the snap ring has a large self-elasticity. During installation, it is easy for the snap ring to pop out due to improper operation, resulting in certain inconvenience in use. Summary of the Utility Model

[0004] The utility model provides an automotive piston facilitating the installation of a snap ring to solve the problems raised in the above background technique.

[0005] To solve the above technical problems, the technical solution adopted by the utility model is:

[0006] An automotive piston facilitating the installation of a snap ring includes a piston body. A reinforcing portion is provided on the inner wall of the piston body. A pin shaft insertion hole penetrating the reinforcing portion is provided on the surface of the piston body. A snap ring groove is provided on the inner wall of the pin shaft insertion hole. Chamfered grooves are provided at both ends of the pin shaft insertion hole and on the surface of the piston body. A guiding groove is provided at the bottom of the inner cavity of the snap ring groove. A pre-installation groove is provided at the bottom of the inner cavity of the guiding groove. A snap ring is lapped on the upper end of the inner wall of the pre-installation groove.

[0007] A further improvement of the technical solution of the present utility model lies in that: the upper opening of the guiding groove is larger than the lower opening, a retention groove is provided at the upper end of the pre-installation groove, the inner diameter of the upper retention groove of the pre-installation groove is slightly larger than the inner diameter of the lower end of the pre-installation groove, the inner diameter opening of the lower end of the guiding groove is smaller than the inner diameter of the retention groove, and the inner diameter of the upper end of the guiding groove is smaller than the inner diameter of the snap ring groove.

[0008] A further improvement of the technical solution of the present utility model lies in that: the lower end of the pre-installation groove is communicated with the outside of the piston body, and the width of the snap ring is greater than the depth of the inner cavity of the snap ring groove.

[0009] A further improvement of the technical solution of the present utility model lies in that: a piston pin is inserted into the pin insertion hole, a connecting sleeve is sleeved on the surface of the piston pin, and a support rod is fixedly connected to the surface of the connecting sleeve.

[0010] A further improvement of the technical solution of the present utility model lies in that: an installation groove is provided at the upper end of the surface of the piston body, and a piston ring is sleeved on the inner wall of the installation groove.

[0011] Due to the adoption of the above technical solution, the technical progress achieved by the present utility model compared with the prior art is:

[0012] The present utility model provides an automobile piston facilitating the installation of a snap ring. Through the setting of the pre-installation groove, during the production of the piston, the snap ring is pre-installed into the retention groove at the upper end of the pre-installation groove. During the formal installation, only the snap ring needs to be pushed out of the retention groove, and then under the action of its own elastic force, during the stretching process, it slides into the snap ring groove along the guiding groove and is fixed in the snap ring groove under its own elastic force to limit the piston pin and prevent the piston pin from generating axial movement. During the installation process, the snap ring is not likely to pop out, and only by pushing the snap ring out of the retention groove, the installation can be completed, making the installation more convenient and thus making it more convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is the front view structural schematic diagram of the present utility model;

[0014] Figure 2 is the front sectional view structural schematic diagram of the present utility model;

[0015] Figure 3 is the sectional view structural schematic diagram of the pre-installation groove of the present utility model;

[0016] Figure 4 is the exploded structural schematic diagram of the present utility model.

[0017] In the figure: 1, piston body; 2, installation groove; 3, piston ring; 4, strengthening part; 5, pin insertion hole; 6, chamfer groove; 7, snap ring groove; 8, guiding groove; 9, pre-installation groove; 10, snap ring; 11, piston pin; 12, connecting sleeve; 13, support rod. Specific embodiments

[0018] The following further describes the present utility model in detail with reference to embodiments:

[0019] Embodiment 1

[0020] As Figure 1-4 shown, the present utility model provides an automotive piston facilitating the installation of a snap ring, including a piston body 1. A reinforcing portion 4 is provided on the inner wall of the piston body 1. A pin hole 5 penetrating the reinforcing portion 4 is provided on the surface of the piston body 1. A snap ring groove 7 is provided on the inner wall of the pin hole 5. Chamfered grooves 6 are provided at both ends of the pin hole 5 and on the surface of the piston body 1. A guiding groove 8 is provided at the bottom of the inner cavity of the snap ring groove 7. A pre-installation groove 9 is provided at the bottom of the inner cavity of the guiding groove 8. A snap ring 10 is lapped at the upper end of the inner wall of the pre-installation groove 9.

[0021] In this embodiment, by pushing the snap ring 10 into the piston body 1 along the opening at the lower end of the inner cavity of the pre-installation groove 9, the snap ring 10 is contracted and enters the guiding groove 8. Under the action of its own elasticity, the snap ring 10 enters the snap ring groove 7 along the guiding groove 8 and expands in the snap ring groove 7 to limit the piston pin 11 and prevent its axial movement. Compared with the conventional installation method, the snap ring 10 is not likely to pop out during installation. At the same time, only by pushing the snap ring 10 out of the retention groove, the installation can be completed, and the installation of the snap ring is more convenient.

[0022] Embodiment 2

[0023] As Figure 1-4 shown, on the basis of Embodiment 1, the present utility model provides a technical solution: Preferably, it includes a piston body 1. A reinforcing portion 4 is provided on the inner wall of the piston body 1. A pin hole 5 penetrating the reinforcing portion 4 is provided on the surface of the piston body 1. A snap ring groove 7 is provided on the inner wall of the pin hole 5. Chamfered grooves 6 are provided at both ends of the pin hole 5 and on the surface of the piston body 1. A guiding groove 8 is provided at the bottom of the inner cavity of the snap ring groove 7. A pre-installation groove 9 is provided at the bottom of the inner cavity of the guiding groove 8. A snap ring 10 is lapped at the upper end of the inner wall of the pre-installation groove 9. The upper opening of the guiding groove 8 is larger than the lower opening. A retention groove is provided at the upper end of the pre-installation groove 9. The inner diameter of the upper retention groove of the pre-installation groove 9 is slightly larger than the inner diameter of the lower end of the pre-installation groove 9. The inner diameter opening at the lower end of the guiding groove 8 is smaller than the inner diameter of the retention groove. The inner diameter at the upper end of the guiding groove 8 is smaller than the inner diameter of the snap ring groove 7. The lower end of the pre-installation groove 9 communicates with the outside of the piston body 1. The width of the snap ring 10 is greater than the depth of the inner cavity of the snap ring groove 7.

[0024] In this embodiment, through the provision of the reinforcing portion 4, the contact area between the piston pin 11 and the piston body 1 can be increased, making their connection stronger. Through the provision of the chamfered groove 6, the sizes at both ends of the pin hole 5 can be enlarged, making it easier to insert the piston pin 11 into the pin hole 5 and making it more convenient to use.

[0025] Embodiment 3

[0026] As Figure 1-4 shown, on the basis of Embodiment 1, the present utility model provides a technical solution: Preferably, it includes a piston body 1. A reinforcing portion 4 is provided on the inner wall of the piston body 1. A pin shaft insertion hole 5 penetrating through the reinforcing portion 4 is provided on the surface of the piston body 1. A snap ring groove 7 is provided on the inner wall of the pin shaft insertion hole 5. Chamfered grooves 6 are provided at both ends of the pin shaft insertion hole 5 and on the surface of the piston body 1. A guiding groove 8 is provided at the bottom of the inner cavity of the snap ring groove 7. A preloading groove 9 is provided at the bottom of the inner cavity of the guiding groove 8. A snap ring 10 is lapped at the upper end of the inner wall of the preloading groove 9. A piston pin 11 is inserted into the pin shaft insertion hole 5. A connecting sleeve 12 is sleeved on the surface of the piston pin 11. A support rod 13 is fixedly connected to the surface of the connecting sleeve 12. An installation groove 2 is provided at the upper end of the surface of the piston body 1. A piston ring 3 is sleeved on the inner wall of the installation groove 2.

[0027] In this embodiment, during the production of the piston body 1, through the preloading of the robotic arm, the snap ring 10 is preloaded from the preloading groove 9 into the retention groove. When connecting the piston body 1 with the support rod 13, the support rod 13 is inserted into the piston body 1. After aligning the insertion hole of the connecting sleeve 12 with the pin shaft insertion hole 5, the piston pin 11 is inserted into the pin shaft insertion hole 5. After inserting it to the appropriate position, the snap ring 10 is installed.

[0028] Next, specifically describe the working principle of the automotive piston facilitating the installation of the snap ring.

[0029] As Figure 1-4 shown, during the production of the piston body 1, through the preloading of the robotic arm, the snap ring 10 is preloaded from the preloading groove 9 into the retention groove. When connecting the piston body 1 with the support rod 13, the support rod 13 is inserted into the piston body 1. After aligning the insertion hole of the connecting sleeve 12 with the pin shaft insertion hole 5, the piston pin 11 is inserted into the pin shaft insertion hole 5. After inserting it to the appropriate position, along the opening at the lower end of the inner cavity of the preloading groove 9, the snap ring 10 is pushed towards the inside of the piston body 1, causing the snap ring 10 to contract and enter the guiding groove 8. Under the action of its own elasticity, the snap ring 10 enters the snap ring groove 7 along the guiding groove 8 and expands in the snap ring groove 7 to limit the piston pin 11 to prevent its axial movement. Compared with the conventional installation method, the snap ring 10 is not likely to pop out during the installation process. At the same time, only by pushing the snap ring 10 out of the retention groove, the installation can be completed. The installation of the snap ring is more convenient. At the same time, the setting of the reinforcing portion 4 can also increase the contact area between the piston pin 11 and the piston body 1, making their connection stronger. The setting of the chamfered groove 6 can enlarge the sizes at both ends of the pin shaft insertion hole 5, making it easier to insert the piston pin 11 into the pin shaft insertion hole 5, making it more convenient to use.

[0030] The above has generally described the present utility model in detail. However, based on the present utility model, some modifications or improvements can be made thereto, which are obvious to those of ordinary skill in the art. Therefore, modifications or improvements that do not depart from the spirit and idea of the present utility model are all within the protection scope of the present utility model.

Claims

1. An automotive piston facilitating the installation of a circlip, comprising a piston body (1), characterized in that: The inner wall of the piston body (1) is provided with a strengthening portion (4). A pin shaft insertion hole (5) penetrating through the strengthening portion (4) is formed on the surface of the piston body (1). A snap ring groove (7) is formed on the inner wall of the pin shaft insertion hole (5). Chamfered grooves (6) are formed at both ends of the pin shaft insertion hole (5) and on the surface of the piston body (1). A guiding groove (8) is formed at the bottom of the inner cavity of the snap ring groove (7). A preloading groove (9) is formed at the bottom of the inner cavity of the guiding groove (8). A snap ring (10) is lapped on the upper end of the inner wall of the preloading groove (9).

2. The automotive piston facilitating snap ring installation according to claim 1, wherein: The upper opening of the guiding groove (8) is larger than the lower opening. A retention groove is provided at the upper end of the preloading groove (9). The inner diameter of the retention groove at the upper end of the preloading groove (9) is slightly larger than the inner diameter of the lower end of the preloading groove (9). The inner diameter opening of the lower end of the guiding groove (8) is smaller than the inner diameter of the retention groove. The inner diameter of the upper end of the guiding groove (8) is smaller than the inner diameter of the snap ring groove (7).

3. The automotive piston facilitating snap ring installation according to claim 1, wherein: The lower end of the preloading groove (9) communicates with the outside of the piston body (1). The width of the snap ring (10) is greater than the depth of the inner cavity of the snap ring groove (se) 4. The automotive piston facilitating the installation of a snap ring according to claim 1, characterized in that: A piston pin shaft (11) is inserted into the pin shaft insertion hole (5). A connecting sleeve (12) is sleeved on the surface of the piston pin shaft (11). A support rod (13) is fixedly connected to the surface of the connecting sleeve (12).

5. The automotive piston facilitating snap ring installation according to claim 1, characterized in that: An installation groove (2) is formed at the upper end of the surface of the piston body (1). A piston ring (3) is sleeved on the inner wall of the installation groove (2).

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