Claims:We Claim:
1. A fuel injection pump 100 comprising at least:
a cylinder head 102 accommodating a plunger 104; characterized in that
an inlet connector 105 fitted to said pump cylinder head 102 in an axial direction of said plunger 104, and
a suction valve 108 located within said cylinder head 102 coaxial to said inlet connector 105,
said suction valve 108 in flow communication with said inlet connector 105.

2. The fuel injection pump 100 of claim 1, wherein said inlet connector 105 is mounted on said cylinder head 102 by at least one of a snap ring, press-fit and a screw connection.

3. The fuel injection pump 100 of claim 1, wherein a screw ring 106 is located between said suction valve 108 and said pump cylinder head 102.

4. The fuel injection pump 100 of claim 1, wherein a zero-delivery throttle 114 is in flow communication with said suction valve 108.
, Description:Field of the invention
[0001] This invention relates to the field of a fuel injection pump.

Background of the invention
[0002] A fuel injection pump is used in a diesel fuel injection system, to pressurize the fuel before sending the same to a common rail/ fuel distributor block/ injector. In the current CP4 generation pump, cylinder head has a suction valve arrangement axially aligned with the piston axis and a high pressure valve in radial direction at 90°. Fuel from the fuel tank through the fuel tank is sucked into the fuel injection pump through the suction valve. The orientation of the suction valve with respect to the piston axis makes it difficult to arrange both inlet and outlet connector on the cylinder head of the fuel injection pump. Hence there is a need for a fuel injection pump that provides a simpler flow path for flow of fuel within and out of the fuel injection pump.

Brief description of the accompanying drawing
[0003] Different modes of the invention are disclosed in detail in the description and illustrated in the accompanying drawing:
[0004] FIG. 1 illustrates a fuel injection pump; and
[0005] FIG. 2 illustrates a cylinder head in the fuel injection pump

Detailed description of the embodiments
[0006] FIG. 1 illustrates a fuel injection pump 100. The fuel injection pump 100 comprises a cylinder head 102 accommodating a plunger 104. An inlet connector 105 is fitted to the pump cylinder head 102 in an axial direction of the plunger 104, and a suction valve 108 is located within the cylinder head 102 and is co-axial to the inlet connector 105, the suction valve 108 is in flow communication with the inlet connector cap 105. The inlet connector 105 is assembled on top to the cylinder head 102 by snap ring, press-fit or screw connection. The function of the inlet connector 105 is to provide the inlet fuel flow passage and seal suction valve chamber. The inlet connector 105 may be made out of plastic material.

[0007] The fuel injection pump 100 comprises a cylinder head 102 accommodating a plunger 104. The plunger 104 is capable of reciprocating within the cylinder head 102 with the help of a roller tappet driven by the cam. The pump cam move the plunger 104 in the delivery direction (upwards) and the plunger 104 spring ensures the plunger 104 returns to the starting position by the end of each cycle. At the bottom end of the plunger 104 guidance bore a plunger sealing ring 110 is located to avoid fuel leakage towards engine oil and vice versa. The leakage passing through the clearance gap between plunger 104 and cylinder head 102 is drained by the leakage bore 112 to the fuel backflow bore 116. The fuel will be drawn into the plunger 104 room through suction valve 108. The fuel quantity is either electronically controlled by the metering unit or by fuel pressure control. The suction valve 108 is fixated on the cylinder head 102 by a ring screw 106. The function of the ring screw 106 is to hold the suction valve 108, transmit the required axial force for the sealing of suction chamber towards the high pressure chamber and to allow fuel flow towards suction valve 108 through some passage chambers.
[0008] The inlet connector 105 is fitted to the pump cylinder head 102 in an axial direction with respect to the cylinder head 102. The fuel within the cylinder head 102 will be pressurized during upward stroke and delivered to the rail and injector through the outlet valve 120. The radial configuration of the outlet valve 120 towards the backflow connector can be opposite 180° or 90° rotated. To allow zero delivery function in case of leakage coming from the low pressure circuit (metering unit) the suction valve chamber is connected by a zero delivery throttle bore 114 to the backflow bore 116. In case of small leakage the pressure won't be enough to lift the suction valve 108 piston and the fuel quantity will drain through the small throttle bore 114. In case of higher pressure, the throttling effect will be increased and the quantity passing through the backflow bore 114 can be neglected.
[0009] FIG. 2 illustrates a cylinder head 102 in the fuel injection pump 100. The inlet connector (105) is fitted to the cylinder head 102 in an axial direction. The inlet connector 105 is mounted on the cylinder head 102 by at least one of a snap ring, press-fit and a screw connection. Since the inlet connector is aligned in an axial direction with respect to the cylinder head 102, the fuel flows with least resistance into the fuel injection pump 100 where it is pressurized.
[0010] It should be understood that embodiments explained in the description above are only illustrative and do not limit the scope of this invention in terms of type of supercharger. 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.