Claims:We claim:
1. A delivery valve assembly (100) in a fuel injection pump (112), said delivery valve assembly (100) comprises:
a valve body (110), comprising
a first end (122);
a second end (124), and
a first bore (126) between said first end (122) and said second end (124), and
a valve holder (104), comprising
a chamber (114) to accommodate said valve body (110), and
a second bore (116) extending from a shoulder (118) of said chamber (114) to a delivery port (102), said first bore (126) and said second bore (116) are aligned and assembled along a central axis (132), characterized in that,
said valve body (110) provided with a flange (120), said flange (120) integrally formed with said valve body (110).

2. The delivery valve assembly (100) as claimed in claim 1, wherein said flange (120) is formed on said second end (124) and interfaces with shoulder (118).

3. The delivery valve assembly (100) as claimed in claim 1, wherein said flange (120) functions as a sealing member, eliminating a need of a dedicated sealing member.

4. The delivery valve assembly (100) as claimed in claim 1, wherein said flange (120) is any one selected from a group comprising a washer, a gasket, and a shim.

5. A valve body (110) for a delivery valve assembly (100) in a fuel injection pump (112), comprises:
a first end (122);
a second end (124), and
a hollow bore (126) between said first end (122) and said second end (124), characterized in that,
a flange (120) provided on said valve body (110), said flange (120) integrally formed with said valve body (110).

6. The valve body (110) as claimed in claim 5, wherein said flange (120) functions as a sealing member when assembled inside a valve holder (104) of said fuel injection pump (112).

7. The valve body (110) as claimed in claim 5, wherein said flange (120) is any one selected from a group comprising a washer, a gasket, and a shim.
, Description:Complete Specification:
The following specification describes and ascertains the nature of this invention and the manner in which it is to be performed:

Field of the invention:
[0001] The present invention relates to a delivery valve assembly in a fuel injection pump and valve body for the same.

Background of the invention:
[0002] In an assembly process of delivery valve holder, there are high chances that copper washer is missed which in turn leads to drop in fuel pressure and delivery variation. In addition to the above problem, it also leads to high pressure fuel leakage within pump leading to drop in pump efficiency. As the complete sub-assembly of delivery valve holder happens in one station which is manually done, and installation of poka-yoke is not possible. The delivery valve assembly consists of valve body, copper washer and valve holder. The problem arises when the copper washer missed during assembly, which in turn results in over-tightening of valve holder resulting in rotation of the barrel in turn drop in fuel pressure and delivery variation. These issues persist even after necessary awareness.

[0003] A patent literature US5921760 discloses a high-pressure fuel-feed pump having a slit on the upper wall of the compression cylinder. A high-pressure fuel-feed pump comprising: a pump body a locking member screwed to the pump body, a cylinder arranged between the locking member and the pump body, the cylinder including a fixing portion for receiving a compression force in a longitudinal direction when the locking member is screwed to the pump body, and a sliding portion continuous with the fixing portion and extending in the longitudinal direction; a plunger reciprocapable in the sliding portion of. the cylinder, and a driving member for driving the plunger; wherein the fixing portion of the cylinder has a slit formed therein.

Brief description of the accompanying drawings:
[0004] An embodiment of the disclosure is described with reference to the following accompanying drawing,
[0005] Fig. 1 illustrates a delivery valve assembly in a fuel injection pump and a valve body, according to an embodiment of the present invention.

Detailed description of the embodiments:
[0006] Fig. 1 illustrates a delivery valve assembly in a fuel injection pump and a valve body, according to an embodiment of the present invention. The delivery valve assembly 100 comprises a valve body 110, comprising a first end 122, a second end 124, and a first bore 126 (also referred to as hollow bore) between the first end 122 and the second end 124. The delivery valve assembly 100 also comprises a valve holder 104, comprising a chamber 114 to accommodate the valve body 110 and a second bore 116 extending from a shoulder 118 of the chamber 114 to a delivery port 102. The first bore 126 and the second bore 116 are assembled and aligned along a central axis 132, characterized in that, the valve body 110 provided with a flange 120. The flange 120 is integrally formed with the valve body 110. Specifically, the flange 120 is formed on the second end 124 and interfaces with the shoulder 118.

[0007] According to the present invention, the chamber 114 comprises a first opening for insertion of the valve body 110, and a second opening as outlet. The second opening is of smaller dimension than the first opening and is defined by a shoulder 118 extending inward from a side surface/wall of the chamber 114. A fuel inlet port 106 is shown for the fuel injection pump 112. A barrel and plunger arrangement 108 is also shown below the valve body 110. The fuel injection pump 112 is not described as being state of the art, and so as the internal components of the delivery valve assembly 100. The delivery port 102 is in fluid communication with a fuel injector. The present invention describes only the necessary components to focus on the improvement and thus in no manner is limited by the same.

[0008] According to the present invention, the flange 120 functions as a sealing member, thus eliminating a need of a dedicated sealing member as used in the conventional design. The integrated flange 120 is any one selected from a group comprising a washer, a gasket, and a shim. The integrally formed flange 120 corresponds to provision of the sealing member in the valve body 110 as a single component instead of two separate components.

[0009] In accordance to an embodiment of the present invention, the valve body 110 for the delivery valve assembly 100 in the fuel injection pump 112 is provided. The valve body 110 comprises the first end 122, the second end 124, and the hollow bore 126 (same as first bore as described above) between the first end 122 and the second end 124, characterized in that, the flange 120 provided on the valve body 110. The flange 120 is integrally formed with the valve body 110. Specifically, the flange 120 is formed on the second end 124 of the valve body 110. The side view 128 and a cut-section view 130 shows the design of the valve body 110 in detail. The hollow bore 126 holds a pin (not referenced).

[0010] According to the present invention, the flange 120 functions as the sealing member when assembled inside the valve holder 104. The integrally formed flange 120 is any one selected from a group comprising the washer, the gasket, and the shim.

[0011] In order to better understand the present invention, consider a side view 128 of the valve body 110. According to the existing or convention design, the valve body 110 is provided without the flange 120, i.e. till the second end 124 alone. When assembled with the valve holder 104, a gap between the valve body 110 and the shoulder 118 of the valve holder 104 is filled by a separate sealing member. Now, according to the present invention, the need for the separate sealing member is eliminated by incorporating the features of the sealing member in the valve body 110 itself. A peripheral rim surface, i.e. the second end 124 of the valve body 110 is integrally formed with the sealing member in the shape of the flange 120. Thus, the assembly process of the entire fuel injection pump 112 is simplified. The possibility of missing the sealing member is also removed. The cost of the overall fuel injection pump 112 is also reduced.

[0012] According to the present invention, a new design for valve body 110 for the delivery valve assembly 100 in a conventional fuel injection pump 112 is provided. The valve body 110 comprises flange (or washer) 120 like design on the top (or second end 124) so that the flange 120 deforms and provides necessary sealing between the valve body 110 and the valve holder 104. The design results in no pressure drop, no high pressure fuel leak and no delivery drop. The design also eliminates the dedicated washer or the sealing member. Further, the flange 120 is made of the same material (such as but not limited to a metal) as that of the valve body 110 or of different material as per the requirement of sealing.

[0013] It should be understood that embodiments explained in the description above are only illustrative and do not limit the scope of this invention. Many such embodiments and other modifications and changes in the embodiment explained in the description are envisaged. The scope of the invention is only limited by the scope of the claims.