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A kind of preparation method of crankshaft timing gear

A technology for timing gears and crankshafts, which is applied in the field of preparation of crankshaft timing gears, can solve the problems of crankshaft small end strength damage, affecting the overall strength of spur gears, and crankshaft small end fractures, etc., to achieve large overlap coefficient, low noise, and high performance Good results

Active Publication Date: 2016-09-28
FULAIYIN AUTOMOBILE PARTS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are some defects in this structure, that is, processing a keyway on the relatively small crankshaft head will inevitably cause serious damage to the strength of the crankshaft head, so that the crankshaft head breaks and so on.
The fracture phenomenon of crankshaft spur gear is mainly due to defects in the manufacturing process, which affects the overall strength of the spur gear

Method used

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  • A kind of preparation method of crankshaft timing gear
  • A kind of preparation method of crankshaft timing gear
  • A kind of preparation method of crankshaft timing gear

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Embodiment Construction

[0021] Referring to accompanying drawing, a kind of crankshaft timing gear preparation method comprises the following steps:

[0022] 1) Select a forging made of 20CrMnTi, put the forging in a normalizing furnace, control the temperature at 900°C-930°C, and heat for 3 hours;

[0023] 2) Choose a CNC lathe, choose a carbide cutter for the tool, and carry out fine turning of the large end a to 42±0.2mm and the small end of the gear Outside diameter c to Groove d, inner hole e to

[0024] 3) Choose a CNC lathe, choose a carbide cutter for the tool, and carry out finishing turning on the other big end of the gear from f to little endian to Outer diameter h to Groove j, inner hole e to

[0025] 4) Use the gear hobbing machine to hob the gear, and then shave the gear after the gear hobbing, and the shaving precision reaches level 6 precision;

[0026] 5) After shaving the gear on the machining center, drill four φ30mm heavy holes i, six φ10.5mm through holes j, pin ...

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Abstract

The invention discloses a crankshaft timing gear manufacturing method. The crankshaft timing gear manufacturing method comprises the following steps: (1) selecting a forge piece made from 20 CrMnTi, placing the forge piece into a normalizing furnace, controlling the temperature in a range of 900-930 DEG C and controlling heating time to be 3h; (2) selecting a numerically controlled lathe and a cemented carbide cutter; (3) using the numerically controlled lathe and the cemented carbide cutter to perform gear finish turning, wherein the other large end f is turned to be 40+0.050mm, the small end 8 is turned to be 19.7+0.030mm, the outer diameter h is turned phi 175.60-0.02mm, and a groove j and an inner hole e are turned to be phi 24.8+0.020mm. The crankshaft timing gear manufacturing method is free of axial component force in the meshing process, large in overlap coefficient, good in using performance, small in noise, strong in bearing capacity, stable in transmission, high in efficiency and large in bending resistance.

Description

technical field [0001] The invention relates to a machining process for gears, in particular to a preparation method for crankshaft timing gears. Background technique [0002] The assembly requirement between the crankshaft small end and the crankshaft timing gear of the earlier diesel engine is a transition fit, relying on the keyway on the crankshaft small end and the keyway on the crankshaft timing gear to transmit torque through the key. However, there are some defects in this structure, that is, processing a keyway on the relatively small crankshaft head will inevitably cause serious damage to the strength of the crankshaft head, so that the crankshaft head breaks and the like. The fracture phenomenon of crankshaft spur gear is mainly due to defects in the manufacturing process, which affects the overall strength of the spur gear. Contents of the invention [0003] The purpose of the present invention is to provide a preparation method of crankshaft timing gear, whic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P15/14
Inventor 姜国松
Owner FULAIYIN AUTOMOBILE PARTS
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