CN211422813U

CN211422813U - Fuel injection device

Info

Publication number: CN211422813U
Application number: CN202020143050.6U
Authority: CN
Inventors: 钱炯
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 2020-01-22
Filing date: 2020-01-22
Publication date: 2020-09-04
Anticipated expiration: 2030-01-22

Abstract

The application provides a fuel injection device, including the sprayer body and oil feed connector, the sprayer body has body connecting portion, the cavity is acceptd in the internal formation of body connecting portion, body connecting portion part protrusion the sprayer body forms and connects the wall, it has the screw thread on the connection wall, the top surface of connecting the wall forms and connects the face, the oil feed connector includes lower connecting portion, coupling nut and last connecting portion, lower connecting portion at least part accept in accept the cavity, go up to have the screw thread on the connecting portion, coupling nut has the cover and arranges in go up the connecting hole of connecting portion, coupling nut with the screw fastening of connecting the wall, lower connecting portion have spacing face in order to restrict the coupling nut is followed the displacement of the downward connecting portion of oil feed connector axis direction. Through the structure of this application, can reduce the leakage of fuel.

Description

Fuel injection device

Technical Field

The present invention relates to a fuel injection device, and more particularly, to a fuel injection device that can effectively prevent leakage of oil.

Background

The fuel injection apparatus is an important component in the field of high-pressure fuel supply, and therefore, the fuel injection apparatus needs to be connected to a high-pressure supply line, and particularly, in a diesel common rail system, high-pressure fuel is supplied from a common rail to the fuel injection apparatus through a connector, and therefore, how to prevent leakage of the high-pressure fuel becomes a problem which is urgently needed.

Referring to FIG. 1, a fuel injection device according to the prior art is shown, wherein the fuel injection device body is only partially shown. The injector body 90 is partially recessed to form a connection chamber 91, and has an internal thread inside the connection chamber 91. The connector 80 is partially received in the connection cavity 91 and is provided with external threads, and the connection cavity 91 is provided with a gasket which is pressed by the connector 80 to prevent high-pressure fuel leakage. At the rear end of the connector 80, there is an abutment 82 having an external thread which can be coupled with an internal thread of the nut 71 of the oil pipe 70, thereby providing a tight connection between the oil pipe 70 and the connector 80.

When it is desired to remove oil tube 70, nut 71 is rotated to remove nut 71 from abutment 82 and the circumferential force generated by the rotation is transmitted along connector 80. The connection of the connector 80 to the connection chamber 91 is loosened by the transmitted circumferential force, and thus the fuel may be partially leaked.

SUMMERY OF THE UTILITY MODEL

The present application is directed to overcoming the deficiencies of the prior art and providing a fuel injection device that reduces fuel leakage.

For accomplishing above-mentioned application purpose, this application provides a fuel injection device, including the sprayer body and oil feed connector, its characterized in that, the sprayer body has body coupling portion, the cavity is acceptd in the internal formation of body coupling portion, body coupling portion part protrusion the sprayer body forms and connects the wall, connect the wall and go up the screw thread, the top surface of connecting the wall forms and connects the face, the oil feed connector includes lower connecting portion, connecting nut and last connecting portion, lower connecting portion part at least part accept in accept the cavity, go up to have the screw thread on the connecting portion, connecting nut has the cover and arranges in go up the connecting hole of connecting portion, connecting nut with the screw-thread tightening of connecting the wall, lower connecting portion have spacing face in order to restrict connect the nut edge the displacement of the downward connecting portion of oil feed connector axis direction.

The present application also has the following features: the limiting surface is formed by a limiting body which extends outwards from the lower connecting part.

The present application also has the following features: the screw thread on the connecting wall is an external screw thread, and the connecting nut is provided with an internal screw thread.

The present application also has the following features: the connecting wall forms from connecting the partial recess of face and blockking the chamber, be provided with the stopper on the connecting portion down, the stopper sets up in blockking the intracavity.

The present application also has the following features: the blocking body is a sphere and is arranged in a ball socket on the wall surface of the lower connecting part.

The present application also has the following features: the accommodating cavity is internally accommodated with a gasket, and the lower connecting part compresses the gasket.

The present application also has the following features: the upper connecting part is provided with an external thread.

The present application also has the following features: the upper connecting part is connected with a high-pressure oil pipe, and the high-pressure oil pipe is provided with an oil pipe nut connected with the external thread of the upper connecting part.

The present application also has the following features: the threads on the connecting wall and the threads on the upper connecting portion have the same handedness.

The present application also has the following features: the fuel injection device is a fuel injection device for a diesel common rail system.

Use the technical scheme that this application provided, the coupling nut not with connector fixed connection, so dismantle high pressure fuel pipe's circumference power can not transmit the coupling nut, consequently can effectively reduce the possibility of fuel leakage.

Drawings

Exemplary embodiments of the present application will be described in detail below with reference to the attached drawings, it being understood that the following description of the embodiments is only for the purpose of explanation and not limitation of the scope of the present application, and in the accompanying drawings:

FIG. 1 is a cross-sectional view of a prior art fuel injection device with the injector body only partially shown;

FIG. 2 is a cross-sectional view of an embodiment of the fuel injection apparatus of the present application, with portions of the high pressure oil rail shown for ease of illustration;

FIG. 3 is a partial view of the fuel injection apparatus of FIG. 2 to show the internal structure of the oil feed connector;

fig. 4 is a sectional view of the oil feed connector of the fuel injection device shown in fig. 3 taken along the direction a-a.

List of reference numerals:

injector body 10

Body connecting part 11

Accommodating cavity 111

Connecting wall 112

Connection surface 1121

Barrier chamber 1122

Oil inlet connector 20

Lower connecting part 21

Limiting body 211

Barrier 212

Coupling nut 22

Upper connecting part 23

Gasket 30

High pressure oil pipe 40

Oil pipe nut 41

Oil pipe 70

Nut 71

Connector 80

Butt joint part 82

Injector body 90

Connecting cavity 91

Detailed Description

It should be understood that the drawings are for purposes of illustration only and that the dimensions, proportions and number of parts are not to be construed as limiting the application.

Referring to fig. 2, a cross-sectional view of one embodiment of the fuel injection apparatus of the present application includes an injector body 10 and an oil feed connector 20.

Referring to fig. 3 and 4, the injector body 10 has a body connecting portion 11, the body connecting portion 11 has a receiving cavity 111 formed by recessing, and a gasket 30 is disposed at the bottom of the receiving cavity 111. The body connecting portion 11 partially protrudes from the injector body 10 to form a connecting wall 112, and an external thread is formed outside the connecting wall 112. A connection surface 1121 is formed at the top surface of the connection wall 112. The oil feed connector 20 includes a lower connection portion 21, a connection nut 22, and an upper connection portion 23. The upper portion of the lower connecting portion 21 extends outward to form a stopper body 211, and a portion of the stopper body 211 facing the coupling nut 22 forms a stopper surface. The upper connection portion 23 has an external thread for connection with an internal thread of a tubing nut 41 on the high pressure tubing 40. The lower connecting portion 21 is at least partially received in the receiving cavity 111, the connecting nut 22 has a connecting hole, the connecting nut 22 is sleeved on the upper connecting portion 23 and penetrates through the connecting hole, and the connecting nut 22 is not fixedly connected with the lower connecting portion 21 and the upper connecting portion 23 and can rotate in the circumferential direction. The coupling nut 22 has internal threads therein that are tightened against external threads of the coupling wall 112. The connecting wall 112 is partially recessed from the connecting surface 1121 to form a blocking cavity 1122, the surface of the lower connecting portion 21 is recessed inwardly to form a socket, a ball is disposed in the socket to form a blocking body 212, and the blocking body 212 is disposed in the blocking cavity 1122 to prevent the lower connecting portion 21 from rotating in the circumferential direction in the receiving cavity 111. The threads on the connecting wall 112 have the same handedness as the threads on the upper connecting portion 23.

When the gasket 30 is installed, the spacer 30 is placed in the receiving cavity 111, and the lower connecting portion 21 is at least partially received in the receiving cavity 111, and at this time, the blocking body 212 is disposed in the blocking cavity 1122. The internal thread of the connection nut 22 is connected with the external thread of the connection wall 112, and the connection nut 22 further presses the lower connection portion 21 into the accommodation cavity 111 through the limiting surface of the limiting body 211, so that after the lower connection portion 21 presses the gasket 30, the lower connection portion 21 enters the limit position, and the connection nut 22 cannot be screwed down further. Likewise, the tube nut 41 of the high pressure oil tube 40 is coupled with the external thread of the upper coupling portion 23, thereby tightly coupling the high pressure oil tube 40 with the oil feed connector 20.

When it is desired to remove the high pressure oil pipe 40 from the oil feed connector 20, the oil pipe nut 41 is rotated, thereby releasing the oil pipe nut 41 from contact with the upper connection portion 23. When the oil pipe nut 41 is rotated, a circumferential force is inevitably applied to the upper connection portion 23, thereby causing a tendency for the oil-feeding connector 20 to rotate, however, due to the provision of the blocking body 212 and the blocking chamber 1122, the oil-feeding connector 20 cannot rotate, and thus the tight coupling between the oil-feeding connector 20 and the injector body 10 is not affected. In addition, since the fastening between the oil feed connector 20 and the injector body 10 is formed by the connection between the connection nut 22 and the connection wall 112 and the connection nut 22 and the lower connection portion 21 can rotate circumferentially, even if the lower connection portion 21 rotates, the tight coupling between the connection nut 22 and the injector body 10 cannot be affected.

The foregoing description is directed to one embodiment of the present application, and in other embodiments, other embodiments of the fuel injection apparatus of the present application are possible. In addition, the connecting nut can be provided with external threads, while internal threads are formed on the inner wall of the containing cavity, and the oil pipe nut can also adopt a similar structure; the blocking body may be formed integrally with the upper connection portion.

Claims

1. A fuel injection device comprises an injector body (10) and an oil inlet connector (20), and is characterized in that the injector body (10) is provided with a body connecting part (11), a containing cavity (111) is formed in the body connecting part (11), the part of the body connecting part (11) protrudes out of the injector body (10) to form a connecting wall (112), threads are arranged on the connecting wall (112), a connecting surface (1121) is formed on the top surface of the connecting wall (112), the oil inlet connector (20) comprises a lower connecting part (21), a connecting nut (22) and an upper connecting part (23), at least part of the lower connecting part (21) is contained in the containing cavity (111), threads are arranged on the upper connecting part (23), the connecting nut (22) is provided with a connecting hole sleeved on the upper connecting part (23), and the connecting nut (22) is fastened with the threads of the connecting wall (112), the lower connecting portion (21) is provided with a limiting surface to limit the displacement of the connecting nut (22) along the axial direction of the oil inlet connector (20) towards the lower connecting portion (21).

2. A fuel injection apparatus according to claim 1, wherein said stopper surface is formed by a stopper body (211) extending outwardly from said lower connecting portion (21).

3. The fuel injection apparatus of claim 1, wherein the threads on the connecting wall (112) are external threads and the connecting nut (22) is internally threaded.

4. The fuel injection apparatus as set forth in claim 1, wherein said connecting wall (112) is partially recessed from said connecting surface (1121) to form a dam chamber (1122), and said lower connecting portion (21) is provided with a stopper (212), said stopper (212) being disposed in said dam chamber (1122).

5. A fuel injection apparatus according to claim 4, characterized in that said blocking body (212) is a sphere, said blocking body (212) being arranged in a socket formed in the wall of the lower connection portion (21).

6. A fuel injection apparatus according to claim 1, wherein a gasket (30) is accommodated in said accommodating chamber (111), and said lower connecting portion (21) presses said gasket (30).

7. A fuel injection apparatus according to claim 1, characterized in that the upper connection portion (23) is externally threaded.

8. A fuel injection apparatus according to claim 7, characterized in that the upper connection portion (23) is connected to a high-pressure fuel pipe (40), the high-pressure fuel pipe (40) having a fuel pipe nut (41) connected to the external thread of the upper connection portion (23).

9. A fuel injection apparatus according to claim 7, characterized in that the screw thread on the connecting wall (112) has the same direction of rotation as the screw thread on the upper connecting portion (23).

10. The fuel injection apparatus according to any one of claims 1 to 9, characterized in that the fuel injection apparatus is a fuel injection apparatus for a diesel common rail system.