JPS6126622Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in delivery valve assemblies for fuel injection pumps for internal combustion engines.

FIG. 1 shows a conventional delivery valve assembly 2 incorporated into a pump body 1. At the end of a plunger barrel 4 into which a plunger 3 is fitted, there is a delivery valve assembly press-fixed to a valve seat retainer 5. A delivery valve 7 is fitted into the circular hole 6a of the valve seat body 6 in an oil-tight and slidable manner, and the head of the delivery valve 7 is fitted with a spring 8 that is in contact with the valve seat retainer 5. is being pressed by.

Further, a sleeve 9 suspends the plunger barrel 4 and is fixed to the pump body.

However, in the delivery valve assembly 2 incorporated in the above-mentioned fuel injection pump, particularly in the spring 8 that presses the delivery valve 7 fitted in the circular hole 6a of the valve seat body 6, the spring 8 is placed above the delivery valve 7. spring 8
There is a risk that the valve seat retainer 5 may fall off when the valve seat retainer 5 is attached, and the assembly must be done carefully and is very complicated.

Furthermore, since the plunger can be removed from the upper part of the pump body to facilitate repair, the structure surrounding the delivery valve has become complicated.

In view of the above-mentioned reasons, the present invention is intended to facilitate the assembly and removal of the delivery valve 7 and the valve seat body 6. Examples of the present invention will be described below with reference to the drawings.

A delivery valve assembly 12 is shown in FIG. 2, and a valve holder 15 of the delivery valve assembly 12 has a conical valve seat 15a and is assembled into the pump body 1 via a gasket 16. Inside the holder 15, there is a chamber 1.
5b is formed, and a delivery valve 17 is inserted into the inner bottom of the chamber 15b. The lower end of the delivery valve 17 has a conical shape and is configured to sit on the valve seat 15a of the valve holder.

One end of the delivery valve 17 is provided with a concave portion, and a spring 18 that abuts the holder is inserted into the concave portion. The upper end of the holder has a hole having a diameter into which the delivery valve 17 can be inserted, and the end of the hole is machined into a conical surface. An intermediate piece 20 that contacts the injection chamber 19 is in contact with the conical surface.

Four grooves 15c are formed upward from the upper end of the conical portion of the valve seat portion 15a of the holder 15, leaving a distance s for suction back.
(Fig. 3) is formed.

A nut 21 is screwed into the upper part of the holder 15 to engage the injection pipe 19.

As mentioned above, the present invention has a configuration in which the upper part of the plunger functions as a delivery valve by integrating the valve seat body 6 and the valve seat holder 1 without impairing the release function, and furthermore, the spring contact part of the delivery valve 7 is configured to function as a delivery valve. The concave shape not only prevents the spring 8 from coming off during assembly, but also allows the delivery valve assembly to be assembled into the pump body 1 as one unit, which has the excellent effect of significantly improving assembly work efficiency. It is something.

[Brief explanation of the drawing]

FIG. 1 shows a conventional embodiment, and FIG. 2 shows an embodiment of the present invention. FIG. 3 is a sectional view taken along the line AA in FIG. 2. 1: Pump body, 12: Delivery valve assembly, 15:
Valve holder, 16: Gasket, 17: Delivery valve, 1
8: Spring, 20: Intermediate piece.

Claims (1)

[Scope of utility model registration request] A delivery valve that is located in a passage for fuel to be pumped by a plunger and opens by the pressure of the fuel, a spring for pressing the delivery valve against a valve seat of a valve seat body, and a spring for holding the delivery valve against a valve seat of a valve seat body. In a fuel injection pump delivery valve assembly consisting of a valve seat holder that supports the A delivery valve assembly for a fuel injection pump, characterized in that a delivery valve having a spring receiving side formed in a concave shape is inserted together with a spring, and an intermediate piece is disposed at the upper end to come into contact with an injection pipe.