Powder metallurgy high-performance variable oil pump rotor and production process thereof

An oil pump rotor, powder metallurgy technology, applied in the direction of pumps, pump components, mechanical equipment, etc., can solve the problems of reduced groove width accuracy, high service time, inability to meet, etc., to improve wear resistance and fatigue strength, and save manufacturing. cost, avoid fine grinding effect

Inactive Publication Date: 2021-03-26
SUZHOU NETABHAPE COMPOSITE MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] As the core component of the variable displacement oil pump rotor, the rotor produced by powder metallurgy process is mainly finished after sintering. Although the precision and strength can meet the general use requirements, it cannot meet the higher wear resistance and longer service life. (i.e. higher fatigue strength) requirements
Or although the heat treatment process is used to improve the performance of the rotor, since the heat treatment reduces the accuracy of the groove width, the subsequent fine grinding of the groove width is required, which greatly increases the manufacturing cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A powder metallurgy high-performance variable displacement engine oil pump rotor is prepared from the following raw materials in mass percentage: C is 0.63%, Cu is 1.78%, Mo is 1.32%, and the balance is Fe.

[0034] The production process of the oil pump rotor includes the following steps:

[0035] (1) Forming

[0036] Directly press the raw material powder prepared according to the corresponding mass percentage under a pressure of 600-800MPa to a green body with a density of 7.2g / cc or more through ordinary pressing;

[0037] (2) Sinter hardening

[0038] Use a mesh belt sintering furnace with a maximum sintering temperature of 1121°C to sinter the molded green body into parts with a strength of 400-600MPa; at the same time, during the sintering and cooling process, speed up the internal circulation of the gas and carry out water cooling for the gas outside the furnace , so that the cooling rate of the parts reaches 1.5-2.5 ℃ / S, and the metallographic structure of ...

Embodiment 2

[0053] A powder metallurgy high-performance variable displacement engine oil pump rotor is prepared from the following raw materials in mass percentage: C is 0.65%, Cu is 1.83%, Mo is 1.42%, and the balance is Fe.

[0054] The production process of the oil pump rotor includes the following steps:

[0055] (1) Forming

[0056] Directly press the raw material powder prepared according to the corresponding mass percentage under a pressure of 600-800MPa to a green body with a density of 7.2g / cc or more through ordinary pressing;

[0057] (2) Sinter hardening

[0058] Use a mesh belt sintering furnace with a maximum sintering temperature of 1121°C to sinter the molded green body into parts with a strength of 400-600MPa; at the same time, during the sintering and cooling process, speed up the internal circulation of the gas and carry out water cooling for the gas outside the furnace , so that the cooling rate of the parts reaches 1.5-2.5 ℃ / S, and the metallographic structure of ...

Embodiment 3

[0073] A powder metallurgy high-performance variable displacement engine oil pump rotor is prepared from the following raw materials in mass percentage: C is 0.72%, Cu is 1.98%, Mo is 1.56%, and the balance is Fe.

[0074] The production process of the oil pump rotor includes the following steps:

[0075] (1) Forming

[0076] Directly press the raw material powder prepared according to the corresponding mass percentage under a pressure of 600-800MPa to a green body with a density of 7.2g / cc or more through ordinary pressing;

[0077] (2) Sinter hardening

[0078] Use a mesh belt sintering furnace with a maximum sintering temperature of 1121°C to sinter the molded green body into parts with a strength of 400-600MPa; at the same time, during the sintering and cooling process, speed up the internal circulation of the gas and carry out water cooling for the gas outside the furnace , so that the cooling rate of the parts reaches 1.5-2.5 ℃ / S, and the metallographic structure of ...

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Abstract

The invention discloses a powder metallurgy high-performance variable oil pump rotor and a production process thereof. The oil pump rotor comprises, by mass, 0.63%-0.76% of C, 1.78%-2.23% of Cu, 1.32%-1.65% of Mo and the balance Fe. The wear resistance and fatigue strength of the variable oil pump rotor produced by the production process are greatly improved. The tolerance of the groove width canguarantee 0.03 precision, subsequent accurate grinding of the rotor groove is avoided, and the manufacturing cost is greatly reduced. Therefore, the oil pump rotor prepared by the production process disclosed by the invention has relatively high performance.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy, and in particular relates to a powder metallurgy high-performance variable displacement engine oil pump rotor and a production process thereof. Background technique [0002] The rotor oil pump consists of a housing, an inner rotor, an outer rotor and a pump cover. The inner rotor is fixed on the rotor shaft with a key or a pin, and is directly or indirectly driven by the crankshaft gear. The eccentric distance between the center of the inner rotor and the outer rotor is e, and the inner rotor drives the outer rotor to rotate in the same direction. Generally, the inner rotor of the rotor type oil pump has 4 or more convex teeth, and the number of concave teeth of the outer rotor is one more than the number of convex teeth of the inner rotor, so that the inner and outer rotors rotate in the same direction and not synchronously. The profile shape curve of the rotor is a trochoid. [0003...

Claims

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Application Information

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IPC IPC(8): C22C38/16C22C38/12B22F5/00F04C2/10F04C15/00
CPCB22F5/00C22C38/12C22C38/16F04C2/10F04C15/00
Inventor 霍东成
Owner SUZHOU NETABHAPE COMPOSITE MATERIALS
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