CN-122014597-A - High-pressure oil pump actuating mechanism and high-pressure oil pump

Abstract

The invention provides a high-pressure oil pump actuating mechanism and a high-pressure oil pump, which belong to the technical field of oil pumps and comprise a pump body, a pump cover and a rotor assembly, wherein the pump body is provided with a first high-pressure cavity, the pump cover is connected with the pump body, the pump cover is provided with a second high-pressure cavity, the rotor assembly is positioned between the pump body and the pump cover and separates the first high-pressure cavity from the second high-pressure cavity, the rotor assembly comprises an inner rotor and an outer rotor, the inner rotor and the outer rotor are both rotatably connected with the pump body and eccentric, the inner rotor is provided with a first balance hole, and the first high-pressure cavity and the second high-pressure cavity are communicated through the first balance hole when the inner rotor rotates to a designated position. The invention effectively reduces the pressure difference between the pump body and the high-pressure area of the pump cover, obviously reduces the axial unbalanced force acting on the rotor assembly, relieves the dry friction between the gear and the pump cover/the pump body, greatly reduces the abrasion and prolongs the service life.

Inventors

• ZHU JINSHUN
• HUANG HUI
• LIU TIANCHENG

Assignees

• 威晟汽车科技(宁波)有限公司

Dates

Publication Date

20260512

Application Date

20251224

Claims (10)

1. 1. A high pressure oil pump actuator, comprising: the pump body is provided with a first high-pressure cavity; the pump cover is connected with the pump body and is provided with a second high-pressure cavity; The rotor assembly is positioned between the pump body and the pump cover and separates the first high-pressure cavity from the second high-pressure cavity, the rotor assembly comprises an inner rotor and an outer rotor, the inner rotor and the outer rotor are both rotatably connected with the pump body and eccentric to each other, the inner rotor is provided with a first balance hole, and the first high-pressure cavity and the second high-pressure cavity are communicated through the first balance hole when the inner rotor rotates to a designated position.
2. 2. The actuator of a high pressure oil pump as set forth in claim 1, wherein a first high pressure groove is provided on a side portion of the first high pressure chamber, a second high pressure groove is provided on a side portion of the second high pressure chamber, and the first high pressure groove and the second high pressure groove are communicated with each other through the first balance hole when the inner rotor rotates to a specified position.
3. 3. A high pressure oil pump actuator as set forth in claim 2 wherein said pump cover is further provided with balancing grooves, said balancing grooves being annular grooves and distributed around the circumference of said inner rotor.
4. 4. A high pressure oil pump actuator as set forth in claim 3 wherein said pump body is further provided with a first rotor chamber and a low pressure groove, at least a portion of said inner rotor being located in said first rotor chamber, said low pressure groove being in communication with said first rotor chamber, said inner rotor being further provided with a second balance hole through which said balance groove is in communication with said low pressure groove when said inner rotor is rotated to a designated position.
5. 5. A high pressure oil pump actuator as set forth in claim 4, wherein said pump cover is further provided with a second rotor chamber, at least a portion of said inner rotor being located in said second rotor chamber, said inner rotor separating said first rotor chamber from said second rotor chamber.
6. 6. A high pressure oil pump actuator as set forth in claim 5, wherein said inner rotor is further provided with a third balance hole, and both ends of said third balance hole are respectively communicated with said first rotor chamber and said second rotor chamber.
7. 7. A high pressure oil pump actuator as set forth in claim 5, wherein said inner rotor is provided with axial passages distributed in an axial direction of said inner rotor, and both ends of said axial passages are respectively communicated with said first rotor chamber and said second rotor chamber.
8. 8. A high pressure oil pump actuator as set forth in claim 1 wherein said pump body is further provided with a first low pressure chamber, said pump cover is further provided with a second low pressure chamber, and said rotor assembly separates said first low pressure chamber from said second low pressure chamber.
9. 9. A high-pressure oil pump actuator as set forth in claim 8, wherein said pump body is further provided with a first communication passage, said pump cover is further provided with a second communication passage, said first communication passage communicates with said first low-pressure chamber, said second communication passage communicates with said second low-pressure chamber, and said first communication passage communicates with said second communication passage.
10. 10. A high-pressure oil pump as claimed in claim 1 to 9, characterized in that it comprises a high-pressure oil pump actuator.

Description

High-pressure oil pump actuating mechanism and high-pressure oil pump Technical Field The invention belongs to the technical field of oil pumps, and relates to a high-pressure oil pump actuating mechanism and a high-pressure oil pump. Background In the existing high-pressure oil pump, a pump body and a pump cover are generally matched to form a closed working cavity, an inner rotor and an outer rotor are eccentrically arranged in the working cavity to realize the suction and discharge of oil, when the oil pump is in a high-pressure working condition, obvious pressure difference often exists between high-pressure areas on the pump body side and the pump cover side, and because the pump body and the pump cover are in a split structure, the high-pressure cavities between the pump body and the pump cover are isolated from each other, the pressure difference can directly act on two axial ends of a rotor assembly to generate larger net axial force. The axial force forces the rotor end face to be continuously compressed on the matching end face of the pump cover or the pump body, under the condition of lacking an effective pressure balancing mechanism, the partial stress of the sealing face is too high, the rotor and the end face are difficult to maintain in a stable lubrication state, under long-term operation, the end face abrasion is aggravated, the gap is increased, and further the internal leakage is increased, the volumetric efficiency is reduced, even the clamping stagnation or the failure is caused when the internal leakage is serious, and the service life of the oil pump is obviously shortened. At present, common solutions depend on an external pressure release valve or a fixed orifice, but such structures cannot dynamically respond to pressure changes along with rotation of a rotor, so that accurate and timely axial force balance is difficult to realize, and a large improvement space is provided. Disclosure of Invention The invention aims to solve the problems in the prior art and provides a high-pressure oil pump actuating mechanism and a high-pressure oil pump. The invention aims at realizing the following technical scheme that the high-pressure oil pump actuating mechanism comprises: the pump body is provided with a first high-pressure cavity; the pump cover is connected with the pump body and is provided with a second high-pressure cavity; The rotor assembly is positioned between the pump body and the pump cover and separates the first high-pressure cavity from the second high-pressure cavity, the rotor assembly comprises an inner rotor and an outer rotor, the inner rotor and the outer rotor are both rotatably connected with the pump body and eccentric to each other, the inner rotor is provided with a first balance hole, and the first high-pressure cavity and the second high-pressure cavity are communicated through the first balance hole when the inner rotor rotates to a designated position. In the high-pressure oil pump executing mechanism, a first high-pressure groove is formed in the side portion of the first high-pressure cavity, a second high-pressure groove is formed in the side portion of the second high-pressure cavity, and the first high-pressure groove is communicated with the second high-pressure groove through the first balance hole when the inner rotor rotates to a specified position. In the high-pressure oil pump actuating mechanism, the pump cover is further provided with balancing grooves, and the balancing grooves are annular grooves and distributed around the circumference of the inner rotor. In the high-pressure oil pump actuating mechanism, the pump body is further provided with a first rotor cavity and a low-pressure groove, at least a part of the inner rotor is located in the first rotor cavity, the low-pressure groove is communicated with the first rotor cavity, the inner rotor is further provided with a second balance hole, and the balance groove is communicated with the low-pressure groove through the second balance hole when the inner rotor rotates to a specified position. In the high-pressure oil pump actuating mechanism, the pump cover is further provided with a second rotor cavity, at least a part of the inner rotor is located in the second rotor cavity, and the inner rotor separates the first rotor cavity from the second rotor cavity. In the high-pressure oil pump actuating mechanism, the inner rotor is further provided with a third balance hole, and two ends of the third balance hole are respectively communicated with the first rotor cavity and the second rotor cavity. In the high-pressure oil pump actuating mechanism, the inner rotor is provided with axial channels, the axial channels are distributed along the axial direction of the inner rotor, and two ends of the axial channels are respectively communicated with the first rotor cavity and the second rotor cavity. In the high-pressure oil pump actuating mechanism, the pump body is further provided with a first low-pre