Light vehicle straight injection pump of diesel engine

Abstract

The invention is an in-line fuel injection pump suitable for light vehicle diesel engines. Its main features are: a. The plunger sleeve adopts an integral flange structure, and the oil retaining ring for anti-cavitation is directly installed in the oil passage on the fuel injection pump body; b. The structural parameter cylinder center distance L = 27 ~ 30mm, the ratio of plunger diameter d to cylinder center distance L = 37% ~ 38%, the ratio of cam lift to cylinder center distance H / L = 37% ~ 40%. Moreover, the roller adopts the overall structure without roller bushing, and the ratio of roller width B to cylinder center distance L is greater than or equal to 48.2%; the plunger and plunger sleeve adopt the structure of double spiral groove and double oil return hole . The allowable pump end pressure of the PM type fuel injection pump provided by the present invention reaches above 100MPa, and the maximum fuel supply rate reaches 30mm3 / deg; it can meet the requirements of European No. 2 emission regulations, and has the advantages of simple structure, reliable operation, convenient maintenance and low advantages such as cost.

Description

Technical field: [0001] The invention belongs to an in-line fuel injection pump for diesel engines, in particular to an in-line fuel injection pump for diesel engines suitable for light vehicles. Background technique: [0002] Since the 1990s, countries around the world have paid more and more attention to environmental issues, especially the increasingly stringent emission requirements for diesel engines used as vehicle power. For example, EU countries have formulated Euro 1, Euro 2, and Euro 3 emission regulations, which gradually increase the requirements, and Euro 4 standards to be achieved in the future. my country's national standard GB17691-1999 requires that the emission limits equivalent to Euro 1 and Euro 2 be reached in 2001 and 2005 respectively. [0003] Table 1: Emission limits for type certification tests (GB17691—1999) [0004] [0005] A: Equivalent to European No. 1 [0006] B: Equivalent to Euro 2 [0007] In order to meet the European No. 2 emissio...

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Problems solved by technology

Compared with the in-line fuel injection pump, these new fuel injection technology products have the disadvantages of complex structure and high price, and they do not have a competitive advantage in the Chinese market

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