Fuel delivery pump with floated cycloid rotor

Abstract

The invention belongs to the technical field of auto parts, and relates to a fuel delivery pump with a floated cycloid rotor. The fuel delivery pump with the suspended cycloid rotor comprises a fuel delivery pump body, an outer rotor, an inner rotor and a universal joint. The fuel delivery pump body is in an integral structure. A transverse guide groove is reserved on the bottom surface of a pump inner cavity between the upper portion of a right wall of a low pressure oil cavity and the inner wall of the pump inner cavity. Seven axial through grooves on the outer wall of the outer rotor are distributed at central radial positions of inner wall tooth sections of the outer rotor. When the inner rotor and the outer rotor rotate, fuel flows along the transverse guide groove and the axial through grooves to positions to be lubricated. An oil film is formed between the outer wall of the outer rotor and the inner wall of the pump inner cavity, the outer rotor cannot be contacted with the fuel delivery pump directly under the action of liquid surface tension, the outer rotor is floated in the fuel delivery pump body, and accordingly friction between the outer rotor and the fuel delivery pump body is avoided, and the service life of the fuel delivery pump is prolonged. The fuel delivery pump with the suspended cycloid rotor is stable in operation, low in pulsating, low in noise and high in volume efficiency, and is applicable to automotive diesel engine fuel injection systems.

Description

technical field [0001] The invention belongs to the technical field of auto parts, in particular to a suspension type cycloidal rotor oil delivery pump. Background technique [0002] Automobile diesel engines generally have the problem of insufficient starting fuel supply at low temperature and low speed, which cannot meet the needs of high-pressure fuel systems. The fuel delivery pumps of the mechanical fuel injection system currently used, including vane pumps, gear pumps and plunger pumps, all have pressure and Large flow pulse, high noise, low volumetric efficiency, poor low-speed oil absorption and other defects lead to the emission of domestic automobile diesel engines not meeting the international requirements of Euro Ⅲ or even Euro Ⅳ and Euro Ⅴ standards. [0003] In the high-pressure common rail system of a diesel engine, in order to ensure that the fuel circulates in the low-pressure oil circuit system, and to deliver sufficient flow and a certain pressure of fuel ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of a cycloidal rotor oil delivery pump with simple structure, low noise, large volume ratio and long service life as described in the background technology, and provide a suspension type cycloidal rotor oil delivery pump, a suspension type cycloidal rotor oil delivery pump The oil delivery pump is composed of an oil delivery pump body 1, an outer rotor 2, an inner rotor 3 and a ten-byte 4. The outer rotor 2 is placed in the pump body cavity 101 of the oil delivery pump body 1, and the inner rotor 3 is in the outer rotor 2 and connected with the oil delivery pump body 1. The inner rotor shaft 102 is rotationally connected, and the ten-piece 4 is placed in the ten-piece installation groove 303 of the inner rotor 3. It is characterized in that the oil delivery pump body 1 has an integral structure, and in the circular pump body cavity 101, the inner rotor The shaft 102 is eccentric with the pump body cavity 101 and is vertically placed on the bottom surface of the pump body cavity 101, and the center of circle of the pump body cavity 101 bottom surface is O 1 , the center of the inner rotor shaft 102 on the bottom surface of the pump body cavity 101 is O 2 , through O 2 The radius of the bottom surface of the pump body cavity 101 is O 1 The length of A is r, O 2 deviated from O 1 The distance is d, and the radius O of the bottom surface of the inner cavity of the pump body 101 is 1 A is the axis of symmetry, two half-moon grooves are symmetrically placed on the bottom surface of the pump body cavity 101, with a radius of O 1 The groove on the left side of A is the high-pressure oil chamber 104, the groove on the right side is the low-pressure oil chamber 103, and the oil inlet hole 105 is built in the lower end of the bottom surface of the low-pressure oil chamber 103 in the low-pressure oil chamber 103, and the oil inlet hole 105 is a penetrating oil inlet. The round hole at the bottom of the oil pump body 1, the oil inlet joint part 110 is placed on the back of the oil delivery pump body 1, the bottom of the inner cavity of the oil inlet joint part 110 communicates with the oil inlet hole 105, and the inner cavity wall of the oil inlet joint part 110 is a threaded structure , the annular sealing groove 109 is placed on the front surface of the oil delivery pump body 1, and the three fixing holes 108 are distributed on the oil delivery pump body 1 at equal intervals according to rotational symmetry. There is an annular groove 106 on the inner wall of the surface, and between the upper part of the right side wall of the low-pressure oil chamber 103 and the cylindrical inner wall of the pump body cavity 101, there is a transverse diversion groove 107 on the bottom surface of the pump body cavity 101;

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