A fixture for turning a crankshaft of an automobile air conditioner compressor

Abstract

The utility model discloses a kind of fixture for turning automobile air conditioner compressor crankshaft, including fixture body, positioning groove and positioning hole are equipped on fixture body, clamping groove is equipped on one side of positioning groove on fixture body, the fixture for turning automobile air conditioner compressor crankshaft of the utility model, shorten processing time, improve processing efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of automotive parts processing. Specifically, this utility model relates to a fixture for turning the crankshaft of an automotive air conditioning compressor. Background Technology

[0002] The crankshaft of the existing air conditioning compressor requires machining of through holes and the upper end face. The through holes and the reference shaft have requirements for eccentricity and parallelism, and the upper end face has requirements for perpendicularity to the reference shaft. However, the existing general-purpose fixtures cannot directly clamp and machine it, resulting in long machining time and low machining efficiency.

[0003] Patent CN118905259A, published on November 8, 2024, discloses a method and machine tool for machining crankshafts of air conditioner compressors. The method involves first clamping a long shaft in a first workpiece chuck; turning a short shaft of the crankshaft using a first forward turning tool; machining the center hole at the end of the short shaft using a first center drill; turning a portion of the long shaft relatively close to the eccentric portion using a first reverse turning tool; turning a portion of the long shaft relatively close to the first workpiece chuck using a first forward turning tool; translating the crankshaft on the first turning device to the corresponding position of a second workpiece chuck, and having the second workpiece chuck clamp the portion of the long shaft relatively close to the eccentric portion; clamping the long shaft of the next crankshaft in the first workpiece chuck of the first turning device; turning a portion of the long shaft relatively far from the eccentric portion using a second forward turning tool; and machining the center hole at the end of the long shaft using a second center drill. However, this method for machining crankshafts of air conditioner compressors does not solve the aforementioned technical problems. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a fixture for turning the crankshaft of an automotive air conditioning compressor that shortens processing time and improves processing efficiency.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: The fixture for turning the crankshaft of an automotive air conditioning compressor includes a fixture body, on which a positioning groove and a positioning hole are provided, and a clamping groove is provided on one side of the positioning groove.

[0006] The positioning hole is a stepped hole, which includes a circular hole I and a circular hole II, wherein the diameter of the circular hole II is larger than the diameter of the circular hole I; the positioning groove is a fan-shaped structure, which includes a fan-shaped plane, and the fan-shaped plane is on the same plane as the bottom surface of the circular hole II.

[0007] The fixture body is also provided with a threaded hole, which connects the clamping groove and the positioning groove, and the axis of the threaded hole is perpendicular to one side of the positioning groove.

[0008] The positioning groove extends to the edge of the fixture body.

[0009] The clamp body has a cylindrical structure.

[0010] The clamping groove has an L-shaped structure.

[0011] The top of the circular hole I is chamfered.

[0012] The technical advantages of this utility model are as follows: The crankshaft turning fixture of this utility model for automotive air conditioning compressors ensures stable clamping of the crankshaft through the positioning groove and positioning hole and the locking action of the bolts, meeting the machining requirements of the crankshaft through hole and upper end face. It solves the problem that existing general fixtures cannot directly clamp and process the crankshaft, reduces machining time, and improves machining efficiency. The fixture has a simple overall structure, low manufacturing cost, and can be easily used on ordinary lathes. Attached Figure Description

[0013] This manual includes the following figures, which illustrate the following: Figure 1 This is a schematic diagram of the structure of the fixture for turning the crankshaft of an automotive air conditioning compressor according to this utility model; Figure 2 This is a structural diagram of the crankshaft of an automotive air conditioning compressor.

[0014] The markings in the figure are as follows: 1. Fixture body; 2. Positioning hole; 21. Circular hole I; 22. Circular hole II; 23. Chamfer; 3. Positioning groove; 31. Fan-shaped plane; 32. Side; 4. Clamping groove; 5. Threaded hole; 6. Crankshaft; 61. Through hole; 62. Upper end face; 63. Reference shaft. Detailed Implementation

[0015] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings, in order to help those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of this invention, and to facilitate its implementation.

[0016] like Figure 1 and Figure 2 As shown, the fixture for turning the crankshaft of an automotive air conditioning compressor includes a fixture body 1, which has a positioning groove 3 and a positioning hole 2. A clamping groove 4 is located on one side of the positioning groove 3. After the fixture is fixed to a universal fixture for the lathe spindle and calibrated, the center of the through hole 61 of the crankshaft 6 coincides with the lathe's rotation axis. The crank is placed inside the fixture, and the crank support surface contacts the fan-shaped plane 31. The eccentric distance (X-direction) between the through hole 61 of the crankshaft 6 and the reference shaft 63 is limited by the positioning hole 2. The distance (Y-direction) between the center of the through hole 61 of the crankshaft 6 and the center of the reference shaft 63 is limited by the contact between the crank side 32 and the side 32 of the positioning groove 3, thus meeting the design reference requirements and solving the shortcomings of high cost and low processing efficiency of existing machining methods.

[0017] like Figure 1 and Figure 2 As shown, positioning hole 2 is a stepped hole, including circular hole I 21 and circular hole II 22, with the diameter of circular hole II 22 being larger than that of circular hole I 21; positioning groove 3 is a fan-shaped structure, including a fan-shaped plane 31, which is on the same plane as the bottom surface of circular hole II 22. The stepped hole structure formed by circular hole I 21 and circular hole II 22 helps to ensure the stability of crankshaft 6. The sector-shaped part includes a sector-shaped plane 31 and two side surfaces 32 perpendicular to the sector-shaped plane 31. After the crank's machining support surface is placed on it, it will be supported by the sector-shaped plane 31 and limited by the two side surfaces 32, which can restrict the crank's three degrees of freedom. The crank's reference shaft 63 is placed in the circular hole I21 and plays a positioning role, which can restrict the crank's two degrees of freedom. One side surface 32 of the sector-shaped plane 31 is in contact with one side of the sector-shaped part of the crank, which restricts the crank's one degree of freedom. Then, the locking bolt is installed through the threaded hole 5 to clamp the crank and achieve stable positioning.

[0018] like Figure 1 As shown, the fixture body 1 is also provided with a threaded hole 5, which connects the clamping groove 4 and the positioning groove 3. The axis of the threaded hole 5 is perpendicular to one side of the positioning groove 3. The threaded hole 5 is used to install locking bolts. By tightening the locking bolts, the crankshaft 6 that has been positioned can be clamped. When the crankshaft 6 needs to be processed in batches, simply loosen the locking bolts, remove the crankshaft 6 after turning, replace it with the crankshaft 6 to be processed, and then tighten the locking bolts again. This method is highly convenient to operate, facilitates mass production, improves processing efficiency, and reduces processing costs.

[0019] like Figure 1 As shown, the positioning groove 3 extends to the edge of the fixture body 1. The above structure reduces the manufacturing difficulty of the positioning groove 3, while increasing the area of ​​the fan-shaped plane 31 of the positioning groove 3, so that the support surface of the crankshaft 6 fits stably with the fan-shaped plane 31.

[0020] like Figure 1 As shown, the fixture body 1 has a cylindrical structure. The overall cylindrical shape of the fixture facilitates its fixation on general lathe fixtures such as three-jaw chucks or instrument chucks, allowing for the turning of the upper end face 62 and the through hole 61 of the crankshaft 6, thus completing the crank machining. This dedicated crank machining fixture can be used on conventional lathes, CNC lathes, and other equipment, offering high repeatability, convenient clamping operations, and is particularly suitable for mass production, improving production efficiency and significantly reducing machining costs.

[0021] like Figure 1 As shown, the clamping groove 4 has an L-shaped structure. The clamping groove 4 is easy to manufacture and can also be made parallel to one side of the positioning groove 3, which facilitates the machining of the threaded hole 5.

[0022] like Figure 1As shown, the top of the circular hole II 22 is provided with a chamfer 23. The chamfer 23 can reduce the obstruction of the positioning process of the reference shaft 63 of the crankshaft 6.

[0023] This crankshaft turning fixture for automotive air conditioning compressors ensures stable clamping of the crankshaft 6 through the positioning groove 3 and positioning hole 2, as well as the locking action of bolts. It meets the machining requirements of the through hole 61 and upper end face 62 of the crankshaft 6, solves the problem that existing general-purpose fixtures cannot directly clamp and process it, reduces machining time, and improves machining efficiency. The fixture has a simple overall structure, low manufacturing cost, and can be easily used on ordinary lathes.

[0024] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of the present invention; or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A fixture for turning the crankshaft of an automotive air conditioning compressor, characterized in that: Includes a clamp body (1), the clamp body (1) is provided with a positioning groove (3) and a positioning hole (2), and the clamp body (1) is provided with a clamping groove (4) on one side of the positioning groove (3); The positioning hole (2) is a stepped hole, and the positioning hole (2) includes a circular hole I (21) and a circular hole II (22). The diameter of the circular hole II (22) is larger than the diameter of the circular hole I (21). The positioning groove (3) is a fan-shaped structure, and the positioning groove (3) includes a fan-shaped plane (31). The fan-shaped plane (31) and the bottom surface of the circular hole II (22) are on the same plane.

2. The jig for turning the crankshaft of an automotive air conditioning compressor according to claim 1, characterized in that: The fixture body (1) is also provided with a threaded hole (5), which connects the clamping groove (4) and the positioning groove (3). The axis of the threaded hole (5) is perpendicular to one side of the positioning groove (3).

3. The jig for turning the crankshaft of an automotive air conditioning compressor according to claim 2, characterized in that: The positioning groove (3) extends to the edge of the fixture body (1).

4. The jig for turning the crankshaft of an automotive air conditioning compressor according to any one of claims 1-3, characterized in that: The clamp body (1) has a cylindrical structure.

5. The jig for turning the crankshaft of an automotive air conditioning compressor according to claim 1, characterized in that: The clamping groove (4) has an L-shaped structure.

6. The jig for turning the crankshaft of an automotive air conditioning compressor according to claim 1, characterized in that: The top of the circular hole I (21) is chamfered (23).

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