CN-122014469-A - High-flow electronic control unit pump tappet sleeve

CN122014469ACN 122014469 ACN122014469 ACN 122014469ACN-122014469-A

Abstract

The application relates to a high-flow electric control single pump tappet sleeve which comprises a sleeve main body, an oil inlet ring groove, symmetrical oil inlet holes, an oil drain groove and a drain groove, wherein the sleeve main body is a thin-wall cylinder with an upper opening and a lower opening, the oil inlet ring groove is arranged around the outer circle of the sleeve main body, the oil inlet ring groove is positioned at one end of the sleeve main body, at which the tappet roller end is arranged, and is used for receiving pressure oil from a lubricating oil inlet of a pump box, the symmetrical oil inlet holes are two radial holes formed in the sleeve main body, one ends of the radial holes are communicated with the oil inlet ring groove, the other ends of the radial holes are communicated with an annular gap formed between the sleeve main body and a tappet body, and the drain groove is formed below the radial holes and along the axial direction of the sleeve main body and is used for communicating the annular gap with a camshaft cavity at the lower part of the sleeve main body. According to the tappet sleeve, the lubricating mode and the lubricating structure of the tappet body component of the electric control unit pump are improved, and the effect of improving the reliability of the electric control unit pump is achieved.

Inventors

WANG FANG
WU QI
WEI QI
REN XIAOFENG
YE LAN

Assignees

山西柴油机工业有限责任公司

Dates

Publication Date: 20260512
Application Date: 20260126

Claims (9)

1. A high flow rate electronically controlled monoblock pump jack sleeve, comprising: The sleeve main body is a thin-wall cylinder with an upper opening and a lower opening; The oil inlet ring groove is arranged around the outer circle of the sleeve main body, is positioned at one end of the sleeve main body, provided with the end part of the tappet body roller, and is used for receiving pressure oil from the lubricating oil inlet of the pump box; The symmetrical oil inlet holes are two radial holes formed in the sleeve main body, one end of each radial hole is communicated with the oil inlet ring groove, and the other end of each radial hole is communicated with an annular gap formed between the sleeve main body and the tappet body; the oil drain groove is arranged below the radial hole and is formed along the axial direction of the sleeve main body, and the oil drain groove is used for communicating the annular gap with a cam shaft cavity at the lower part of the sleeve main body; The pressure lubricating oil of the pump box firstly enters an oil inlet ring groove on the outer circle of the sleeve main body, oil in the oil inlet ring groove is directly sprayed into an annular gap between the tappet body and the sleeve main body through two symmetrical radial holes, part of the oil entering the annular gap flows downwards under the driving of gravity and tappet body movement, is guided to a contact area of a roller at the bottom of the tappet body and a cam shaft through an oil drain groove at the lower part of the sleeve main body, and finally is collected into the cam shaft cavity after lubrication, and flows back to a lubricating oil system through an oil return channel of the pump box, so that recycling is realized.
2. The high-flow electronic control unit pump tappet sleeve according to claim 1, wherein a cylindrical surface which is precisely matched with the outer circumference of the tappet body is further arranged on the sleeve main body and used as an inner hole guide surface for providing a flow gap for lubricating oil.
3. The high flow electrically controlled monoblock pump tappet sleeve of claim 1 wherein said tappet body is mounted within said sleeve body and said tappet body moves axially within said sleeve body.
4. The high flow rate electronically controlled monoblock pump jack of claim 1 wherein said oil drain groove is an axial groove.
5. The high-flow electronic control unit pump tappet sleeve according to claim 1, wherein the roller is installed at one end of the tappet body, the roller is installed at the lower end of the tappet body through a tappet pin, and the outer contour of the roller does not exceed the surface of the tappet body.
6. The high flow rate electronically controlled monoblock pump jack of claim 1 wherein the outer circumferential surface of said roller is in linear contact with the cam working surface to form a roller-cam kinematic pair.
7. The high-flow electronic control unit pump tappet sleeve of claim 1, wherein the tappet sleeve is arranged in the pump box, and a lubricating oil inlet of the pump box is communicated with the oil inlet ring groove.
8. The high-flow electronic control unit pump tappet sleeve according to claim 1, wherein oil enters a fit clearance between the tappet body and the sleeve body through two radial oil inlet holes of the sleeve body, and a 360-degree oil film is formed on the periphery of the tappet body.
9. The high-flow electric control single pump tappet sleeve according to claim 1, wherein the tappet sleeve is formed by carburizing and quenching 18CrNiMo7-6 materials, and the surface coating is DLC and TiN.

Description

High-flow electronic control unit pump tappet sleeve Technical Field The application relates to the technical field of fuel injection systems of electric control unit pumps, in particular to a high-flow electric control unit pump tappet sleeve. Background With the continuous rising of the performance of the engine, higher requirements are put on the oil supply pressure, the oil injection rate and the highest rotating speed of the electric control unit pump, so that the load of each moving part of the electric control unit pump is increased. As a key moving part of the electric control unit pump, the tappet body assembly needs to bear larger working strength, and the lubrication mode of the tappet body assembly has direct influence on the working reliability of the electric control unit pump. The lubricating oil reaches the tappet body component through the annular gap between the tappet body and the tappet sleeve and the gap between the tappet sleeve and the pump box, and simultaneously lubricates the roller-cam kinematic pair and the outer round surface of the tappet body in the working process of the electric control unit pump. In the traditional in-line pump fuel injection system of the diesel engine, the tappet body component is generally lubricated by adopting integral infiltration pressure, the lubricating oil is filled in a cam shaft cavity, the tappet body component is soaked in the lubricating oil during working, and lubricating oil returns to an oil pan through a special pipeline. In view of the above, the application aims to develop a large-flow electric control unit pump tappet sleeve, by which the lubricating mode and the lubricating structure of an electric control unit pump tappet body component are improved, so as to achieve the aim of improving the reliability of the electric control unit pump. Disclosure of Invention The application aims to solve the technical problems that in the prior art, a certain type of electronic control unit pump tappet body component has the defects of insufficient lubricating oil quantity and unreasonable lubricating oil distribution. The application provides a high-flow electric control unit pump tappet sleeve which comprises a sleeve main body, an oil inlet ring groove, symmetrical oil inlet holes, an oil drain groove and a cam shaft cavity, wherein the sleeve main body is a thin-wall cylinder with an upper opening and a lower opening, the oil inlet ring groove is arranged around the outer circle of the sleeve main body, the oil inlet ring groove is positioned at one end of the sleeve main body, on which the tappet roller end is mounted, and is used for receiving pressure oil from a lubricating oil inlet of a pump box, the symmetrical oil inlet holes are formed in the sleeve main body, one end of each radial hole is communicated with the oil inlet ring groove, the other end of each radial hole is communicated with an annular gap formed between the sleeve main body and a tappet body, and the oil drain groove is formed below the radial holes and along the axial direction of the sleeve main body and is used for communicating the annular gap with the cam shaft cavity at the lower part of the sleeve main body. The pressure lubricating oil of the pump box firstly enters an oil inlet ring groove on the outer circle of the sleeve main body, oil in the oil inlet ring groove is directly sprayed into an annular gap between the tappet body and the sleeve main body through two symmetrical radial holes, part of the oil entering the annular gap flows downwards under the driving of gravity and tappet body movement, is guided to a contact area between a roller at the bottom of the tappet body and a cam shaft through an oil drain groove at the lower part of the sleeve main body, and finally is gathered into a cam shaft cavity after lubrication, and flows back to a lubricating oil system through an oil return channel of the pump box, so that cyclic utilization is realized. According to the embodiment of the application, the sleeve main body is also provided with a cylindrical surface which is precisely matched with the outer circle of the tappet body and is used as an inner hole guide surface to provide a flowing clearance for lubricating oil. According to an embodiment of the application, the tappet body is fitted in the sleeve body, the tappet body being axially movable in the sleeve body. According to the embodiment of the application, the oil drain groove is an axial groove. According to the embodiment of the application, the idler wheel is arranged at one end of the tappet body, the idler wheel is arranged at the lower end of the tappet body through the tappet pin, and the outer contour of the idler wheel does not exceed the surface of the tappet body. According to an embodiment of the present application, the outer circumferential surface of the roller is in linear contact with the cam working surface to form a roller-cam kinematic pair. According to the embodiment of the a