In-line type fuel feed pump of high-pressure common rail system

Abstract

The invention discloses a double-cylinder in-line type fuel feed pump which has a simple structure and is easy to manufacture. The fuel feed pump comprises a double-cylinder in-line type fuel feed pump, wherein a cam shaft of a double-cylinder in-line type fuel feed pump body is provided with a fuel path group with two groups of mutually independent cam mechanisms; the fuel path group communicates the two groups of cam mechanisms; the two groups of cam mechanisms are fixed on the cam shaft of the pump body through an eccentric wheel; the eccentric circle of the two groups of cam mechanisms is formed in a direction opposite to the radial direction of an eccentric circle on the cam shaft; and a valve seat which is shared by a fuel inlet ball valve and a fuel outlet ball valve is also arranged above a cam structure. The fuel feed pump has the characteristics that: one valve seat is shared by the two valves; a fuel outlet valve conical surface is machined at the upper end of the valve seat; a fuel inlet valve conical surface is machined at the lower end of the valve seat; and the fuel outlet valve conical surface is connected with the fuel inlet valve conical surface through fuel holes in the middle respectively. High-pressure fuel is not concentrated in the pump body, but the fuel is fed to a high-pressure common rail pipe of a diesel engine by directly using two high-pressure fuel pipes, so that the structure of a high-pressure common rail pump is greatly simplified, the manufacturing cost is reduced, and a high-pressure common rail fuel system can be conveniently applied to a light automobile diesel engine.

Description

technical field [0001] The invention relates to a fuel supply pump for a diesel engine fuel system, in particular to an in-line fuel supply pump for a high-pressure common rail fuel system. It belongs to the field of diesel engine fuel system. technical background [0002] As my country's emission regulations become increasingly strict, Euro 4 emission standards will be implemented, and the high-pressure common rail fuel system has been accepted by many diesel engine factories. At present, in the 4-cylinder diesel engines of small light vehicles in China, most of the high-pressure fuel supply pumps are rotor-type common rail pumps from foreign companies such as BOSCH and DENSO. The typical structure is the three-cylinder fuel supply pump of Bosch Company. [M] People's Communication Press 2008), its three plunger couples are evenly distributed along the radial direction of the eccentric circle. Provide high pressure fuel. The high-pressure fuel generated by each plunger is...

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Problems solved by technology

Then sent to the common rail pipe, the structure is compact, but the high pressure sealing is complicated, the processing is difficult, and the manufacturing cost is high

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