A special fixture for machining eccentric holes of crankshaft

Abstract

The present invention discloses a special clamp for machining eccentric holes of crank shafts, comprising a chuck body, a telescopic positioning pin, a female claw and a male claw. The center of the chuck body is laterally provided with a chuck body center hole which can cooperate with the telescopic positioning pin. The telescopic positioning pin is laterally arranged in the center hole of the chuck body. Female claws are arranged on both upper and lower sides of the front end of the chuck body. The female claws are slidably connected to the chuck body, and the female claws are arranged toward the center of the chuck body. Compared with the existing process, the present invention reduces the processing equipment, shortens the processing time, improves the processing accuracy, improves the qualified rate of products, reduces the probability of scrap, and makes the production of crank shafts more stable and reliable. When customers process crank shafts of various different models, the same clamp can be slightly modified to achieve the change of model, thus saving costs. In addition, the present invention has a simple structure, is easy to install and maintain, has a low production cost, and has low requirements for installation machine tools.

Description

[Technical field]

[0001] The invention relates to the technical field of clamps, in particular to the technical field of a special clamp for machining an eccentric hole of a crank shaft. [Background technology]

[0002] The crankshaft is a key component of a motorcycle engine and is the main component of the engine's transmission torque. The most important dimension is the eccentricity of the eccentric hole on the crankshaft, and its manufacturing accuracy directly affects the performance of the engine. With the continuous development of the automobile manufacturing industry, the manufacturing accuracy requirements for the eccentric hole distance of the crankshaft are getting higher and higher. At present, the eccentric hole processing method of the crankshaft is still using the traditional multi-process, multi-machine tool method, and the machine tool fixture used for processing is manually adjusted. The processing time is long and the processing size is unstable, which greatly affects the processing efficiency. At the same time, there are many unqualified parts processed, and the production waste is relatively serious. Therefore, there is an urgent need for a fixture that can improve processing efficiency, increase processing efficiency, reduce costs, and reduce waste. [Summary of the invention]

[0003] The purpose of the present invention is to solve the problems in the prior art and to propose a special fixture for processing the eccentric hole of a crank shaft. The fixture can be specifically used for processing the eccentric hole of the crank shaft. High-precision products can be processed with simple operations, thereby improving the manufacturing level, reducing processing equipment, shortening processing time, improving processing accuracy, improving the product qualification rate, and reducing the chance of scrap.

[0004] To achieve the above-mentioned purpose, the present invention proposes a special fixture for processing eccentric holes in crank shafts, comprising a chuck body, a telescopic positioning pin, a mother claw and a child claw. The center of the chuck body is laterally provided with a chuck body center hole that can cooperate with the telescopic positioning pin. The telescopic positioning pin is laterally arranged in the center hole of the chuck body. Mother claws are arranged on the upper and lower sides of the front end of the chuck body. The mother claws are slidably connected to the chuck body. The mother claws are arranged toward the center of the chuck body. Child claws are arranged on the upper ends of the mother claws, and the child claws are arranged toward the center of the chuck body.

[0005] Preferably, a positioning base block that can cooperate with the telescopic positioning pin is provided at one end of the center hole of the chuck body near the front end of the chuck body, the telescopic positioning pin is slidably connected to the positioning base block, a pull rod is provided at one end of the telescopic positioning pin away from the positioning base block, the pull rod is fixedly connected to the telescopic positioning pin, the pull rod outer sleeve is provided with a pull rod adapter, and the pull rod adapter is fixedly connected to the chuck body

[0006] Preferably, the telescopic positioning pin is provided with a telescopic positioning pin limiting slide groove, and the positioning base block is provided with a limiting pin that can cooperate with the telescopic positioning pin limiting slide groove.

[0007] Preferably, a return spring that can cooperate with the pull rod is provided in the pull rod adapter.

[0008] Preferably, the sub-claws include short sub-claws and long sub-claws, the length of the long sub-claws is longer than that of the short sub-claws, and the short sub-claws and the long sub-claws are respectively arranged on two mother claws.

[0009] Preferably, the front end of the chuck body is provided with a plurality of positioning blocks which can cooperate with the crank shaft, and the positioning blocks are all arranged around the center between the short claw and the long claw.

[0010] Preferably, the long sub-claw is provided with a sub-claw positioning pin extension hole which can cooperate with the telescopic positioning pin.

[0011] Preferably, a plurality of counterweight holes are evenly arranged on the outer ring of one end of the chuck body close to the mother claw and the son claw, and a plurality of counterweight blocks that can cooperate with the counterweight holes are detachably arranged on the counterweight holes.

[0012] The beneficial effects of the special clamp for processing the eccentric hole of the crank shaft of the present invention: compared with the existing process, the present invention reduces the processing equipment, shortens the processing time, improves the processing accuracy, improves the product qualification rate, reduces the probability of scrap generation, and makes the production of the crank shaft more stable and reliable; when the customer processes various types of crank shafts, the same clamp can be slightly modified to achieve the change of model, saving costs; and the present invention has a simple structure, easy installation and maintenance, low production cost, and low requirements for installation machine tools.

[0013] The features and advantages of the present invention will be described in detail through embodiments in conjunction with the accompanying drawings.

Brief Description of the Drawings

[0014] Figure 1 It is a schematic diagram of the structure of a special fixture for machining eccentric holes of a crank shaft according to the present invention, a front view and a cross-sectional view;

[0015] Figure 2 It is a side view of a structural schematic diagram of a special fixture for machining an eccentric hole of a crank shaft according to the present invention.

[0016] In the figure: 1-chuck body, 2-telescopic positioning pin, 3-positioning base block, 4-mother claw, 5-sub-claw, 6-positioning block, 7-pull rod adapter, 8-pull rod, 9-reset spring, 10-counterweight hole, 21-telescopic positioning pin limit slide, 31-limiting pin, 51-short sub-claw, 52-long sub-claw, 101-counterweight block. 521-sub-claw positioning pin extension hole. [Specific implementation method]

[0017] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below through the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the scope of the present invention. In addition, in the following description, the description of known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0018] See also Figure 1 , Figure 2 The present invention discloses a special fixture for machining an eccentric hole of a crankshaft, comprising a chuck body 1, a telescopic positioning pin 2, a female claw 4, and a child claw 5. The center of the chuck body 1 is laterally provided with a chuck body center hole 11 which can cooperate with the telescopic positioning pin 2. The telescopic positioning pin 2 is laterally arranged in the center hole 11 of the chuck body. The upper and lower sides of the front end of the chuck body 1 are provided with female claws 4. The female claw 4 is slidably connected with the chuck body 1. The female claw 4 is arranged toward the center of the chuck body 1. The upper ends of the female claws 4 are provided with child claws 5. The child claws 5 are arranged toward the center of the chuck body 1. A positioning base block 3 which can cooperate with the telescopic positioning pin 2 is provided at one end of the center hole 11 of the chuck body close to the front end of the chuck body 1. The telescopic positioning pin 2 is slidably connected with the positioning base block 3. A pull rod 8 is provided on the end of the telescopic positioning pin 2 away from the positioning base block 3. The pull rod 8 is fixedly connected to the telescopic positioning pin 2. A pull rod adapter 7 is provided on the outer sleeve of the pull rod 8. The pull rod adapter 7 is fixedly connected to the chuck body 1, the telescopic positioning pin 2 is provided with a telescopic positioning pin limiting slide 21, the positioning base block 3 is provided with a limiting pin 31 that can cooperate with the telescopic positioning pin limiting slide 21, the pull rod adapter 7 is provided with a reset spring 9 that can cooperate with the pull rod 8, the sub-claw 5 includes a short sub-claw 51 and a long sub-claw 52, ​​the length of the long sub-claw 52 is longer than the length of the short sub-claw 51, and the short sub-claw 51 and the long sub-claw 52 are respectively provided at two On the mother claw 4, the front end of the chuck body 1 is provided with a plurality of positioning blocks 6 that can cooperate with the crank shaft, and the positioning blocks 6 are all arranged around the center between the short son claw 51 and the long son claw 52, ​​and the long son claw 52 is provided with a son claw positioning pin extension hole 521 that can cooperate with the telescopic positioning pin 2, and the outer circle of one end of the chuck body 1 close to the mother claw 4 and the son claw 5 is evenly provided with a plurality of counterweight holes 10, and the counterweight holes 10 are detachably provided with a plurality of counterweight blocks 101 that can cooperate therewith.

[0019] Working process of the present invention:

[0020] The special clamp for machining an eccentric hole of a crankshaft of the present invention is provided. During operation, in the initial state of the clamp, the mother claw 4 drives the short son claw 51 and the long son claw 52 to open, and the telescopic pin 2 extends. When clamping the crankshaft, its axial position is limited by the positioning block 6, and its angular position is limited by the telescopic pin 2; then the mother claw 4 drives the short son claw 51 and the long son claw 52 to clamp; finally, the telescopic pin 2 is retracted into the clamp, the machine tool is started, and the eccentric hole is processed. The counterweight block (101) is installed through the counterweight hole 10 arranged on the periphery of the chuck body 1, so as to have good dynamic balance when rotating at high speed.

[0021] The above embodiments are intended to illustrate the present invention, not to limit the present invention. Any solution that is a simple transformation of the present invention belongs to the protection scope of the present invention.

Claims

1. A special fixture for machining eccentric holes of crankshafts, characterized in that: The invention comprises a chuck body (1), a telescopic positioning pin (2), a female claw (4), and a sub-claw (5); the center of the chuck body (1) is laterally provided with a chuck body center hole (11) which can cooperate with the telescopic positioning pin (2); the telescopic positioning pin (2) is laterally arranged in the chuck body center hole (11); the front end of the chuck body (1) is provided with female claws (4) on both upper and lower sides; the female claws (4) are slidably connected to the chuck body (1); the female claws (4) are arranged toward the center of the chuck body (1); the upper ends of the female claws (4) are provided with sub-claws (5); the sub-claws (5) are arranged toward the center of the chuck body (1); the center hole (11) of the chuck body is close to the chuck body; (1) A positioning base block (3) capable of cooperating with a telescopic positioning pin (2) is provided at one end of the front end, the telescopic positioning pin (2) is slidably connected to the positioning base block (3), a pull rod (8) is provided at the end of the telescopic positioning pin (2) away from the positioning base block (3), the pull rod (8) is fixedly connected to the telescopic positioning pin (2), a pull rod adapter (7) is provided on the outer sleeve of the pull rod (8), and the pull rod adapter (7) is fixedly connected to the chuck body (1); a plurality of counterweight holes (10) are evenly arranged on the outer ring of one end of the chuck body (1) close to the female claw (4) and the male claw (5), and a plurality of counterweight blocks (101) capable of cooperating with the counterweight holes (10) are detachably provided on the counterweight holes (10).

2. A special fixture for machining eccentric holes of crankshafts as claimed in claim 1, characterized in that: The telescopic positioning pin (2) is provided with a telescopic positioning pin limiting sliding groove (21), and the positioning base block (3) is provided with a limiting pin (31) that can cooperate with the telescopic positioning pin limiting sliding groove (21).

3. A special fixture for machining eccentric holes of crankshafts as claimed in claim 1, characterized in that: The pull rod adapter (7) is provided with a return spring (9) that can cooperate with the pull rod (8).

4. A special fixture for machining eccentric holes of crankshafts as claimed in claim 1, characterized in that: The sub-claw (5) comprises a short sub-claw (51) and a long sub-claw (52), the length of the long sub-claw (52) being longer than the length of the short sub-claw (51), and the short sub-claw (51) and the long sub-claw (52) being respectively arranged on two mother claws (4).

5. A special fixture for machining eccentric holes of crankshafts as claimed in claim 1, characterized in that: The front end of the chuck body (1) is provided with a plurality of positioning blocks (6) that can cooperate with the crank shaft, and the positioning blocks (6) are all arranged around the center between the short claw (51) and the long claw (52).

6. A special fixture for machining eccentric holes of crankshafts as claimed in claim 4, characterized in that: The long sub-claw (52) is provided with a sub-claw positioning pin extension hole (521) that can cooperate with the telescopic positioning pin (2).

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