Pulse damper using composite spring

Abstract

The present invention relates to a pulse damper using a composite spring device for eliminating pulse waves in a plunger pump for supplying fuel so as to maintain the fuel pressure at a constant level without energy loss and to cover a wide range of pressure, which comprises a spring body (31), and a body (21) for receiving an O-ring spacer (23) supported by an internal O-ring cap (25), wherein a low pressure coil spring (51) and a high pressure disk spring (41) are arranged in a line inside the spring body (31) so that the low pressure coil spring (51) primarily works and then stops by making a low pressure spring cover (52) and a low spring pad (53) contact a low pressure spring stopper (34), and secondarily the high pressure disk spring (41) works and then stops by making a high pressure spring pad (14) mounted on one end of a spring guide shaft (12) connected to a piston (11); contact a high pressure spring stopper (33).

Description

technical field [0001] The present invention relates to a kind of pulsation damper suitable for gasoline direct injection engine, more specifically, relates to a kind of pulsation damper utilizing composite spring, the pulsation damper utilizing composite spring is attached to gasoline direct injection The main body of the pulsation damper of the fuel rail of the engine can perform linear reciprocating motion. The piston uses the composite spring to repeatedly convert the pulsation wave in the fuel into compression energy (Energy) and store and release it, eliminating the need for a plunger pump (plunger pump) for fuel supply. The pulsation waves generated by the pump) make the fuel maintain a certain pressure state without pulsation waves, so that it can be used without engine pump loss. Background technique [0002] In general, an engine of a vehicle is configured such that fuel stored in a fuel tank is supplied at high pressure by a fuel pump to an injector that injects t...

AI Technical Summary

Problems solved by technology

However, the existing pulsation damping device using an orifice is a method of rapidly reducing the cross-sectional area of ​​the fuel pipe to generate flow and pressure resistance to attenuate the pulsation wave.

The existing orifice method utilizes the flow rate and pressure resistance, so it is a structure with a large loss of pump energy.

[0011] In addition, there is also a pulsation damper that uses a single coil spring as described in the past, such as patent application No. 10-2007-0070249, but the above technology uses a single coil spring, so it is difficult to control Disadvantages of pulsation over a wide pressure range

[0012] Moreover, once all springs exceed the elastic limit, they will be plastically deformed and lose spring recovery force and spring performance. Therefore, in order to prevent plastic deformation, a stop device that stops the action with a load above the elastic region is required, and the structure of the above-mentioned patent technology is not A construction without said stop, which makes it difficult to cope with the plastic deformation of the spring

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