JPH0687662U - Air bleeder for fuel injection pump of diesel engine - Google Patents

Abstract

(57) [Abstract] [Purpose] The fuel return port 24 can be directly connected to the fuel return oil passage 22 formed of a steel pipe, a copper pipe, or the like that is not deteriorated by heat. [Structure] An air bleeding cock 15 is provided in communication with the oil escape reservoir 2 of the fuel injection pump 1. Air bleeding cock 1
5 is an air vent passage 17 along the axis of the cock body 16.
The communication chamber 18 and the valve insertion hole 19 are opened in series, and the needle valve 20 is inserted into the valve insertion hole 19.
The operation handle 25 is fixed to the base end portion of the needle valve 20, and the tip end portion of the needle valve 20 is connected to the communication chamber 1.
The air vent passage 17 is configured to be openable and closable so as to face the air vent passage 17 from 8. An eye pipe joint 23 is fitted onto the cock body 16, and the communication chamber 18 is connected to the fuel return oil passage 2 through a fuel return port 24 formed in the eye pipe joint 23.
Connect to 2.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an air bleeder for a fuel injection pump of a diesel engine.

[0002]

[Prior art]

 As this type of air bleeding device, one disclosed in Japanese Patent Application Laid-Open No. 4-321726 proposed by the present applicant has been known. As shown in FIG. 2, it is provided with an air vent cock 15 in communication with the oil escape reservoir 2 of the fuel injection pump 1. The air vent cock 15 is provided with an air vent passage along the axis of the cock body 16. 17, a communication chamber 18 and a valve insertion hole 19 are opened in series, a needle valve 20 is inserted into the valve insertion hole 19, and an operation handle 25 is fixed to the proximal end portion of the needle valve 20. The tip of the needle valve 20 faces the air vent passage 17 from the communication chamber 18 so that the air vent passage 17 can be opened and closed, and the fuel return port 24 is formed integrally with the cock body 16 to prevent the fuel from leaking. The communication chamber 18 is configured to communicate with the fuel return oil passage 22 via the return port 24.

[0003]

[Problems to be solved by the device]

 The fuel return oil passage 22 is connected to the fuel return port 24 of the air bleeding cock 15. However, in the above-mentioned conventional technique, the fuel return port 24 is formed integrally with the cock body 16, so this cock When the main body 16 is screwed into the cock attachment port 14 of the fuel supply plug 10 and assembled, the direction of the fuel return port 24 is not fixed, and the direction of the fuel return port 24 cannot be freely set. Therefore, conventionally, the fuel return port 24 has been connected to the fuel return oil passage 22 via an elastically deformable vinyl tube or the like.

However, if a vinyl tube or the like is interposed in the fuel return oil passage 22, there is a disadvantage that the vinyl tube is deteriorated early due to heat generation of the engine. The present invention has been made in view of the above circumstances, and the fuel return port 24 can be directly connected to the fuel return oil passage 22 formed of a steel pipe, a copper pipe, or the like that is not deteriorated by heat. The technical problem is to eliminate such inconvenience.

[0005]

[Means for Solving the Problems]

 As a solution to the above problems, the present invention is configured as follows. That is, an air bleeding cock 15 is provided in communication with the oil escape reservoir 2 of the fuel injection pump 1. The air bleeding cock 15 has an air bleeding passage 17, a communication chamber 18, and a valve insertion hole 19 that are opened in series along the axis of the cock body 16, and the needle valve 20 is inserted into the valve insertion hole 19. The operation handle 25 is fixed to the base end portion of the needle valve 20, and the tip end portion of the needle valve 20 is exposed from the communication chamber 18 to the air vent passage 17 so that the air vent passage 17 can be opened and closed. . The eye pipe joint 23 is externally fitted to the cock body 16, and the communication chamber 18 is communicated with the fuel return oil passage 22 through the fuel return port 24 formed in the eye pipe joint 23.

[0006]

[Work]

 In the present invention, an eye pipe joint 23 is fitted onto the cock body 16, and the communication chamber 18 is connected to the fuel return oil passage 22 through a fuel return port 24 formed in the eye pipe joint 23. Therefore, when the cock body 16 is screwed into the cock attachment port 14 of the fuel injection pump 1 to be assembled, the direction of the fuel return port 24 can be freely set. As a result, the fuel return port 23 can be adapted and directly connected to the fuel return passage 22 formed of a steel pipe, a copper pipe or the like.

[0007]

[Effect of device]

 The present invention is configured as described above, and since the fuel return port 23 can be directly connected to the fuel return oil passage 22 formed of a steel pipe, a copper pipe or the like, it can be directly connected to the fuel return oil passage 22. The problem of deterioration can be solved.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view of a main part of a fuel injection pump according to an embodiment of the present invention. A fuel supply plug 10 is attached to the fuel injection pump 1 so as to communicate with the oil sump chamber 2, and a cock body 16 of an air bleeding cock 15 is screwed into a cock mounting opening 14 of the fuel supply plug 10. . Fuel flows from the fuel inlet 13 of the fuel supply plug 10 into the oil escape reservoir chamber 2 through an inlet port 11 formed in the pump bracket 9.

The air bleeding cock 15 includes a cock body 16, a needle valve 20, an operation handle 25 fixed to the proximal end of the needle valve 20, and an eye tube joint 23 fitted on the cock body 16. . An air vent passage 17, a communication chamber 18, and a valve insertion hole 19 are opened in series along the axis of the cock body 16, and a needle valve 20 is inserted into the valve insertion hole 19 to The tip end of the needle valve 20 faces the air vent passage 17 from the communication chamber 18, and the air vent passage 17 can be opened and closed by the operation handle 25. That is, by operating the needle valve 20 with the operation handle 25 to return the fuel from the fuel return oil passage 22 to the fuel tank through the air vent passage 17, the communication chamber 18, and the fuel return port 24 in this order, the fuel supply passage The air in the oil sump chamber 2 and the fuel supply plug 10 is released.

The eye pipe joint 23 is loosely fitted to the cock body 16 as described above, and after the direction of the fuel return port 24 is freely set, the eye pipe joint 23 is vented to the cock attachment port 14 of the fuel supply plug 10. The cock body 16 of the cock 15 can be screwed and assembled. As a result, the direction of the fuel return port 24 can be adapted to the fuel return oil passage 22 formed of a steel pipe, a copper pipe, or the like, and the fuel return port 24 can be directly connected. That is, as described above, the fuel return port 24 can be directly connected by adapting to the fuel return oil passage 22 formed of a steel pipe, a copper pipe, or the like that is not deteriorated by heat. It is possible to solve the problem of early deterioration due to.

In the above embodiment, the air vent cock 15 is described as being screwed into the cock attachment port 14 of the fuel supply plug 10 for assembly, but the present invention is not limited to this, and the air vent cock 15 is not limited thereto. It is not necessary to say that it can be implemented by making appropriate changes such as directly assembling the pump bracket 9 to the pump bracket 9 and communicating with the oil escape reservoir chamber 2.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a main part of a fuel injection pump according to an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view of a main part of a fuel injection pump according to a conventional example.

[Explanation of symbols]

1 ... Fuel injection pump, 2 ... Oil sump chamber, 15
... Air bleeding cock, 16 ... Cock body, 17 ... Air bleeding passageway, 18 ... Communication chamber, 19 ... Valve insertion hole,
20 ... Needle valve, 22 ... Fuel return oil passage, 2
3 ... Eye pipe joint, 24 ... Fuel return port, 25
… Operating handle.

Claims (1)

[Scope of utility model registration request] 1. An oil sump chamber (2) of a fuel injection pump (1)
An air bleeding cock (15) is provided in communication with the air bleeding cock (15), and the air bleeding cock (15) is provided along the axis of the cock body (16) with the air bleeding passageway (17), the communication chamber (18) and the valve insertion hole. (19) are opened in series, the needle valve (20) is inserted into the valve insertion hole (19), and the operation handle (25) is fixed to the proximal end of the needle valve (20). , This needle valve (2
The air vent passage (17) is configured to be openable and closable by exposing the distal end of (0) from the communication chamber (18) to the air vent passage (17), and the eye pipe joint (23) is attached to the cock body (16). The fuel return port (2) formed in the eye pipe joint (23)
An air bleeding device for a fuel injection pump of a diesel engine, characterized in that the communication chamber (18) is communicated with the fuel return oil passage (22) via 4).