Special piston pin center hole machining structure

Abstract

The utility model relates to the technical field of machining, and discloses a special piston pin center hole machining structure which comprises a base, a pressing block is arranged at the top of the base, a pressing plate is arranged on the outer wall of the pressing block, a pressing screw is in threaded connection with the middle of the pressing plate, and a limiting column is arranged at the bottom of the outer wall of the rear side of the base. The outer wall of the limiting column is sleeved with a flat gasket, an angle positioning pin is arranged at the top of the outer wall of the base, a piston pin is arranged in the middle of the base, a shaft check ring is arranged on the outer wall of the pressing plate, and the shaft check ring mainly plays a role in limiting axial displacement of the pressing plate and prevents the pressing plate from axially moving due to vibration or other external force factors in the machining process. The tool is simple in structure and operation, high in repeated positioning accuracy, capable of effectively guaranteeing form and location tolerance and surface quality of all positions of an outer circle, an inner hole and an end face of the piston pin, capable of reducing working procedures and avoiding tool vibration, accurate in clamping, capable of improving efficiency and accuracy and capable of guaranteeing product machining quality.

Description

Technical Field

[0001] This utility model relates to the field of processing technology, and in particular to a special piston pin center hole processing structure. Background Technology

[0002] A piston pin is a cylindrical pin installed on the piston skirt. Its center passes through the connecting rod small end bore to connect the piston and connecting rod, transmitting the gas force on the piston to the connecting rod. It is generally made of high-quality alloy steel and is hollow.

[0003] The piston pin is a key component connecting the piston skirt, and its machining quality directly impacts the engine's lifespan and safety. Therefore, strict control over the internal and external quality, as well as dimensional and positional tolerances, is crucial during piston pin machining. Traditional machining methods involve machining the outer diameter first, followed by the piston pin's center hole, often machined by turning. However, since most center holes are small in diameter and the workpiece is relatively long, vibrations during machining can easily occur, making it difficult to guarantee surface quality and dimensional and positional tolerances. This method involves numerous steps, multiple clamping operations, and inaccurate positioning, leading to prolonged machining time. Furthermore, the entire quality control relies on the operator's alignment, increasing the risk of quality problems due to human error. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides a special piston pin center hole machining structure, which aims to improve the problems of multiple clamping operations, inaccurate positioning, and long machining time in the prior art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a special piston pin center hole machining structure, including a base, a pressure block is provided on the top of the base, a pressure plate is provided on the outer wall of the pressure block, a clamping screw is threadedly connected to the middle of the pressure plate, a limit post is provided at the bottom of the rear outer wall of the base, a flat washer is sleeved on the outer wall of the limit post, an angle positioning pin is provided on the top of the outer wall of the base, and a piston pin is provided in the middle of the base.

[0006] As a further description of the above technical solution:

[0007] The outer wall of the pressure plate is provided with a shaft retaining ring.

[0008] As a further description of the above technical solution:

[0009] The installed pressure plate, the clamping screw, the shaft retaining ring, and the pressure block are fixedly connected to the base by internal hexagonal screws.

[0010] As a further description of the above technical solution:

[0011] Both the flat pad and the limiting post are fixedly connected to the base by nuts.

[0012] As a further description of the above technical solution:

[0013] The angular locating pin is used to prevent the piston pin from rotating.

[0014] As a further description of the above technical solution:

[0015] The limiting post is used for positioning the end face of the piston pin.

[0016] As a further description of the above technical solution:

[0017] The clamping screw is used to secure the piston pin.

[0018] This utility model has the following beneficial effects:

[0019] 1. In this utility model, the structure and operation are simple, the repeatability and positioning accuracy are high, and it can effectively ensure the form and position tolerances and surface quality of the outer circle, inner hole and end face of the piston pin. It reduces the number of processes, avoids vibration, and ensures precise clamping, thereby improving efficiency and accuracy and ensuring product processing quality. Attached Figure Description

[0020] Figure 1 This is a front view of a special piston pin center hole machining structure proposed in this utility model;

[0021] Figure 2 This is a side view of a special piston pin center hole machining structure proposed in this utility model.

[0022] Legend:

[0023] 1. Base; 2. Pressure plate; 3. Clamping screw; 4. Shaft retaining ring; 5. Pressure block; 6. Piston pin; 7. Flat washer; 8. Limiting post; 9. Nut; 10. Angle positioning pin; 11. Socket head screw. Detailed Implementation

[0024] 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.

[0025] Reference Figure 1 and Figure 2This utility model provides an embodiment of a dedicated piston pin center hole machining structure, including a base 1. The base 1 serves as the basic load-bearing component of the entire machining structure, providing a stable mounting platform and support foundation for all components on it. A pressure block 5 is provided on the top of the base 1. The pressure block 5 plays an important auxiliary positioning and clamping role during machining, directly contacting the piston pin 6 and maintaining it in a suitable position through a certain pressure, which is beneficial for the accurate subsequent center hole machining operation. A pressure plate 2 is provided on the outer wall of the pressure block 5. The pressure plate 2 and the pressure block 5 cooperate to form a stable clamping system for the piston pin 6. A clamping screw 3 is threadedly connected to the middle of the pressure plate 2. By rotating the clamping screw 3, the clamping force of the pressure plate 2 on the pressure block 5 and the piston pin 6 can be adjusted. This threaded connection method makes the adjustment of the clamping force more precise and convenient, and can adapt to piston pins 6 of different sizes or machining requirements, ensuring that the piston pin 6 will not shift or shake during machining, thereby ensuring the accuracy of the center hole machining. A limit post 8 is provided at the bottom of the rear outer wall of the base 1, which limits the piston pin. Pin 6 plays a crucial role in end-face positioning. It can accurately determine the position of piston pin 6 in the axial direction, providing an accurate starting point and machining depth reference for the center hole machining. This avoids deviation in the center hole machining position due to inaccurate axial position of piston pin 6. A flat washer 7 is fitted on the outer wall of the limiting post 8. The flat washer 7 can evenly distribute the clamping force of nut 9 on limiting post 8 and base 1, preventing damage to the component surface or affecting connection stability due to excessive local pressure. An angle positioning pin 10 is provided on the top of the outer wall of base 1. The angle positioning pin 10 is used to prevent piston pin 6 from rotating. It is extremely important to ensure that the angle of piston pin 6 remains fixed during the center hole machining process. The cooperation between angle positioning pin 10 and specific parts of piston pin 6 can effectively limit its circumferential rotation, so that the machining tool can perform center hole machining on piston pin 6 according to the predetermined angle and trajectory, ensuring that the angle accuracy of the machined center hole meets the requirements. Piston pin 6 is provided in the middle of base 1. As the machining object, piston pin 6 is in the core position of the entire machining structure. Through the synergistic effect of various components, high-precision machining of its center hole is achieved.

[0026] Reference Figure 1 and Figure 2 The outer wall of the pressure plate 2 is provided with a shaft retaining ring 4. The shaft retaining ring 4 mainly serves to limit the axial displacement of the pressure plate 2, preventing the pressure plate 2 from moving axially due to vibration or other external forces during the processing, thereby maintaining the stability of the entire clamping structure, ensuring that the clamping force on the piston pin 6 is continuously effective, and ensuring the smooth processing of the center hole and the stable and reliable processing quality.

[0027] Reference Figure 1 and Figure 2The installed pressure plate 2, clamping screw 3, shaft retaining ring 4 and pressure block 5 are fixedly connected to the base 1 by internal hex screws 11, which can stably fix the clamping assembly composed of pressure plate 2, clamping screw 3, shaft retaining ring 4 and pressure block 5 to the base 1, forming an integral and reliable piston pin 6 clamping and positioning system.

[0028] Reference Figure 1 and Figure 2 The flat washer 7 and the limiting post 8 are both fixedly connected to the base 1 by the nut 9. The nut 9 and the limiting post 8 are threaded together, so that the axial position of the limiting post 8 on the base 1 can be precisely adjusted according to parameters such as the length of the piston pin 6. After the position is determined, the limiting post 8 is firmly fixed to the base 1 by tightening the nut 9, so as to provide an accurate end face positioning reference for the piston pin 6.

[0029] Reference Figure 1 and Figure 2 The angular positioning pin 10 is used to prevent the piston pin 6 from rotating. When the piston pin 6 is placed on the base 1 and contacts the angular positioning pin 10, the angular positioning pin 10 can effectively restrict the rotational freedom of the piston pin 6 in the circumferential direction, ensuring that the angle of the piston pin 6 remains constant when machining the center hole.

[0030] Reference Figure 1 and Figure 2 The limiting post 8 is used for positioning the end face of the piston pin 6. During the machining of the center hole, the depth of cut of the machining tool and the determination of the axial position of the center hole in the piston pin 6 both depend on this starting point. The height of the limiting post 8 can be adjusted according to the specific size requirements of the piston pin 6. After adjustment, it is fixed by the nut 9, thereby providing an accurate and consistent end face positioning reference for piston pins 6 of different specifications.

[0031] Reference Figure 1 and Figure 2 The clamping screw 3 is used to fix the piston pin 6. Before processing, the piston pin 6 is placed in the predetermined position on the base 1. By tightening the clamping screw 3, the pressure plate 2 and the pressure block 5 gradually approach and press the piston pin 6 until the piston pin 6 is firmly fixed on the base 1 and will not be displaced.

[0032] Working principle: When machining the center hole of the piston pin, the direction of the piston pin 6 is first determined by the angular locating pin 10. This ensures that the angular position of the piston pin 6 remains stable throughout the entire machining process.

[0033] The piston pin 6 is placed in the base 1 for positioning, so that when the piston pin 6 is placed on the base 1, its axis can coincide as much as possible with the ideal axis required for subsequent machining of the center hole, thereby ensuring the coaxiality requirement between the piston pin 6 and the center hole.

[0034] When the piston pin 6 is placed in the tooling, the limiting post 8 contacts the end face of the piston pin 6, precisely determining a specific position of the piston pin 6 in the axial direction. This ensures the axial positioning accuracy of the piston pin 6.

[0035] Finally, the piston pin 6 is secured by the clamping screw 3. Rotating the clamping screw 3 causes the pressure plate 2 and the pressure block 5 to engage with each other, gradually applying clamping force to the piston pin 6 until the piston pin 6 is firmly fixed to the base 1.

[0036] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A special piston pin center hole machining structure, comprising a base (1), characterized in that: The base (1) is provided with a pressure block (5) on the top, and a pressure plate (2) is provided on the outer wall of the pressure block (5). A clamping screw (3) is threadedly connected in the middle of the pressure plate (2). A limit post (8) is provided at the bottom of the rear outer wall of the base (1). A flat washer (7) is sleeved on the outer wall of the limit post (8). An angle positioning pin (10) is provided at the top of the outer wall of the base (1). A piston pin (6) is provided in the middle of the base (1).

2. The special piston pin center hole machining structure according to claim 1, characterized in that: The outer wall of the pressure plate (2) is provided with a shaft retaining ring (4).

3. The special piston pin center hole machining structure according to claim 2, characterized in that: The installed pressure plate (2), the clamping screw (3), the shaft retaining ring (4) and the pressure block (5) are fixedly connected to the base (1) by internal hex screws (11).

4. The special piston pin center hole machining structure according to claim 1, characterized in that: The flat pad (7) and the limiting post (8) are both fixedly connected to the base (1) by nuts (9).

5. The special piston pin center hole machining structure according to claim 1, characterized in that: The angular positioning pin (10) is used to prevent the piston pin (6) from rotating.

6. The special piston pin center hole machining structure according to claim 1, characterized in that: The limiting post (8) is used for positioning the end face of the piston pin (6).

7. The special piston pin center hole machining structure according to claim 1, characterized in that: The clamping screw (3) is used to fix the piston pin (6).

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