Technical realization elements of fuel inlet and outlet valve components for fuel injection pumps

Technical realization elements:

6. In view of the problems in the prior art, the present invention provides an oil inlet and outlet valve assembly for a fuel injection pump that solves the leakage caused by excessive oil valve sealing surfaces, reduces the space required for arranging the valve assembly, and improves the volumetric efficiency.

7. The present invention is realized in this way. An oil inlet and outlet valve assembly for a fuel injection pump includes a plunger sleeve, a plunger, an oil inlet valve assembly and an oil outlet valve assembly; wherein the oil inlet valve assembly is installed in the plunger in the plunger sleeve In the upper part of the cavity, an oil inlet valve tight seat is screwed on the plunger sleeve on the upper part of the oil inlet valve assembly. The plunger sleeve is also provided with an oil drain line communicating with the plunger cavity, and an oil outlet valve assembly is installed on the oil outlet line in the plunger sleeve; the oil inlet valve assembly adopts a flat-sealed valve assembly, including an oil inlet valve plate and Inlet valve spring; the inlet valve plate and the lower end surface of the inlet valve seat are sealed and fitted, the lower part of the inlet valve plate presses the inlet valve spring, and the lower end of the inlet valve spring abuts against the upper part of the plunger cavity On the shoulder; the delivery valve assembly adopts a ball valve assembly, including an delivery valve ball fitted with a spherical groove on the delivery oil path, the delivery valve ball abuts on the hollow delivery valve stem, and the delivery valve The side wall of the oil valve stem is provided with an oil inlet, the oil outlet valve stem is provided with an oil outlet valve spring positioning table, and the oil outlet valve spring is installed in the oil outlet valve stem, and the oil outlet valve spring and the oil outlet The valve spring positioning table abuts, and a hollow outlet valve spring seat is sleeved on the outlet valve spring in the oil outlet path; a valve stem and an outlet valve spring seat are arranged between the outlet valve stem and the outlet valve spring seat. The oil valve spring moves the space.

8. Preferably, an oil drain hole is provided in the plunger sleeve, a sealing member is installed in the oil drain hole, the upper end surface of the sealing member and the upper top of the oil drain hole form an oil return space, the oil return space The oil return oil passage connected with the oil inlet oil passage of the plunger cavity.

9. Advantages and technical effects of the present invention: The fuel intake valve assembly of the present invention adopts a flat-sealed fuel intake valve plate inverted in the center hole of the plunger sleeve, which reduces a sealing surface for pressing the fuel intake valve seat, thereby reducing one The leakage source reduces the layout space of the oil inlet valve and improves the volumetric efficiency. The oil outlet valve assembly adopts a steel ball and valve stem combined structure, which reduces the cost of grinding the valve core sealing surface while maintaining a certain guiding effect when the valve core moves. In summary, the present invention reasonably arranges the oil inlet and outlet valves in a limited space, maximizes the utilization of the internal space of the plunger sleeve, avoids ineffective volumes as much as possible, and reduces the processing difficulty.

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