Preparing method of gear for fuel delivery pump

A technology for oil delivery pumps and gears, which is applied in the field of gear preparation for oil delivery pumps, can solve problems such as not being suitable for the use of oil delivery pumps, and achieve the effects of low noise, strong bearing capacity, and stable transmission

Active Publication Date: 2013-03-06
FULAIYIN AUTOMOBILE PARTS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The quality of the gear of the gear oil pump directly affects the performance of the oil pump. At present, the manufacturing process of this kind of gear is not suitable for the use requirements of the oil pump.

Method used

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  • Preparing method of gear for fuel delivery pump

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Embodiment Construction

[0019] Referring to the accompanying drawings, a method for preparing a gear for an oil delivery pump includes the following steps:

[0020] 1) Casting and molding gear blanks, the weight percentages of the chemical components of each component are: C: 2.85-3.25%, Si: 1.2-1.5%, Mn: 0.8-1.2%, P: 0.6-0.8%, S: 0.05-0.07% , Cr 0.24-0.35%, Cu 0.7-0.9%, the temperature of the poured gear blank is reduced to 300°C, then heated to 650-760°C, kept for 3-5 hours, cooled to 300°C, kept for 4 hours, and then heated Heat to 650-760°C, keep warm for 17 hours, cool to 450°C at 50°C / hour, then cool to 140°C at 20°C / hour; repeat heat treatment twice;

[0021] 2) Choose a CNC lathe, choose a carbide tool for the tool, and carry out the finishing turning of the large end a of the gear to 18.6±0.2mm, the small end b to 6.1±0.05mm, the outer diameter e to φ74.1±0.1mm and chamfering, Inner hole c to φ38.5±0.1 mm;

[0022] 3) Choose a CNC lathe, choose a carbide tool for the tool, and perform fini...

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Abstract

The invention discloses a preparing method of a gear for a fuel delivery pump, which comprises the following steps that a gear blank is molded by casting, and the gear blank comprises the following chemical components by weight percent: 2.85 to 3.25% of C, 1.2 to 1.5% of Si, 0.8 to 1.2% of Mn, 0.6 to 0.8% of P, 0.05 to 0.07 of S, 0.24 to 0.35% of Cr and 0.7 to 0.9% of Cu; the temperature of the gear blank which is molded by casting is lowered to 300 DEG C, then the gear blank is heated to 650 to 760 DEG C, and the temperature is kept for 3 to 5 hours; furnace cooling is performed, so that the temperature of the gear blank is lowered to 300 DEG C, and the temperature is kept for 4 hours; then the gear blank is heated to 650 to 760 DEG C, and the temperature is kept for 17 hours; and finally, the gear blank is cooled to 450 DEG C at a cooling rate of 50 DEG C/hour and then cooled to 140 DEG C at a cooling rate of 20 DEG C/hour. The preparing method has the advantages of no axial component in the process of engagement, large overlap coefficient, good use performance, low noise, strong bearing capacity, smooth transmission, high efficiency and large bending resistant strength.

Description

technical field [0001] The invention relates to the field of oil pumps, in particular to a method for preparing gears for oil delivery pumps. Background technique [0002] The role of the fuel delivery pump is to ensure that the diesel oil circulates in the low-pressure oil circuit, and to supply a sufficient amount of fuel with a certain pressure to the fuel injection pump. The fuel delivery volume should be 3-4 times the maximum fuel injection volume under full load. Oil pumps are divided into gear oil pumps, diaphragm oil pumps, plunger oil pumps, pipeline oil pumps and so on. The quality of the gears of the gear oil pump directly affects the performance of the oil pump. At present, the manufacturing process of this kind of gear is not suitable for the use requirements of the oil pump. Contents of the invention [0003] The purpose of the present invention is to provide a gear preparation method for oil pumps, which has no axial component force in the meshing process, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/14C22C37/06C23F17/00
Inventor 姜国松
Owner FULAIYIN AUTOMOBILE PARTS
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