Optimized Design of Low Pressure Oil Circuit Diesel Filter System

Abstract

The invention discloses a diesel filter system with a design-optimized low-pressure oil way. The system comprises a filter, a filter base, a filter screen, a starting pump and a one-way valve assembly, wherein the filter base is provided with a cavity; the starting pump is sleeved in the filter screen which is sleeved in the cavity of the filter base; the one-way valve assembly is arranged on thefilter base; and when the starting pump is activated or stops working, the one-way valve assembly controls the on state of an oil way between the filter and the filter base. The system realizes formation of a device having a function of automatically emptying the low pressure oil way by mounting the starting pump, the filter screen and the like in the filter base, so that the structure of the traditional filter base with a hand oil pump is replaced; therefore, the same mounting dimension during the design of a diesel engine and the interchangeability with the traditional diesel filter are ensured. Besides, fuel oil is prevented from forming an internal loop in the startup state of the system, and a fuel oil system is guaranteed to obtain predetermined fuel oil pressure and emptying efficiency. Moreover, the diesel filter system meets the mounting requirements of different engines, and is good in universality.

Description

technical field [0001] The invention relates to an optimally designed low-pressure oil circuit diesel oil filter system. Background technique [0002] Since the country implemented the National III emission regulations in 2008, the high-pressure common rail system has been generally installed on diesel engines, and it is very likely to completely replace other fuel injection methods according to the current development trend. [0003] However, while the high-pressure common rail system increases the fuel injection pressure, the low-pressure oil circuit often cannot be automatically emptied when the engine is started at low speed, causing the engine to start unstable, difficult to start, or suddenly shut down, reducing the comfort of the vehicle drivers and passengers. sex. Therefore need a device with automatic emptying function under engine low-speed starting state. [0004] At present, domestic and foreign emptying devices are mainly to install a hand oil pump on the die...

AI Technical Summary

Problems solved by technology

From the comparison of the two structures: the design of the hand oil pump is simple, but it must be operated by opening the cover and manually pressing the hand oil pump to exhaust. This exhaust method is very time-consuming and laborious for medium and heavy passenger cars and trucks.

For some drivers who do not know that there is a hand oil pump, they may use continuous ignition to start the engine, resulting in overheating damage to the starter motor or abnormal wear of the carbon brush of the starter motor and reducing the working life. Therefore, the current domestic diesel engine manufacturers , most of them can only choose starter motors of foreign brands, thus increasing the manufacturing cost of the engine and even the whole vehicle

Adding a starting pump between the high-pressure common rail system and the coarse filter is the choice of most diesel engine manufacturers at present, but the structure is relatively complicated, and the starting pump needs a mounting bracket to be fixed on the engine cylinder wall, occupying car engine installation space

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