Abrasion-resistant bearing of motor type fuel pump

Abstract

A wear-resistant bearing of a motor-type fuel pump, characterized in that it is composed of Cu-Ni based sintered alloy, and the sintered alloy has graphite: 1-5% and P content: 5-10% in mass % Cu-P alloy: 2 to 9%, Cu-Ni alloy containing 21 to 26% Ni: the remaining part is composed of a sintered body of a compacted powder body, and is formed on a Cu-Ni alloy matrix , the pores are dispersedly distributed at a ratio of porosity: 8 to 18%, and have a structure in which P component is distributed at the grain boundary between the Cu-Ni alloy grains and free graphite is distributed in the pores.

Description

technical field [0001] The present invention relates to a bearing which is made of a high-strength Cu-Ni sintered alloy which has excellent wear resistance and corrosion resistance, and is therefore particularly suitable for miniaturization and weight reduction of motor-type fuel pumps. And when applicable, it can exert excellent wear resistance for a long time. Background technique [0002] Conventional engines that use liquid fuels such as gasoline or light oil as fuel generally have motor-type fuel pumps. For example, as motor-type fuel pumps for gasoline engines, there are such figure 2 The structure shown in the simplified cross-section diagram is familiar to everyone. [0003] That is, as shown in the figure, the above-mentioned motor-type fuel pump operates as follows: in the casing, the rotating shaft fixedly arranged at both ends of the motor is supported by bearings, an impeller is inserted into one end of the rotating shaft, and It has a structure in which a gas...

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Problems solved by technology

However, in order to achieve miniaturization while ensuring the discharge performance of the motor-type fuel pump with the above-mentioned structure, a high driving force, that is, an increase in the number of rotations is necessary. In this way, the liquid fuel such as gasoline introduced into the fuel pump will At high pressure and high speed, the flow passage through the gap becomes narrower. Under this condition, especially for the bearing as a structural component of the motor fuel pump, it is required to be miniaturized and ultra-thin, and have a higher Strength and wear resistance, but in the Cu-based sintered alloy bearings used in the motor fuel pump of the above structure, although any of them have high strength, they do not have sufficient wear resistance, so wear progresses quickly. Moreover, this wear, when the above-mentioned liquid fuel contains impurities such as sulfur or its compounds, the wear will be further accelerated, and as a result, the service life will be reached in a relatively short time, which is the current situation.

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