Pulsation dampening structure for fuel rail
The present disclosure relates to a pulsation dampening structure for a vehicle. The pulsation dampening structure includes a fuel rail, a rail plug disposed at an end portion of the fuel rail, and a pulsation dampening part disposed on the rail plug to dampen pulsation generated when fuel enters. A turbulent flow is caused by reflecting fuel which was entered, and a vortex is generated in the fuel, thereby dampening pulsation.
1. A pulsation dampening structure for a vehicle, comprising:
a fuel rail;
a rail plug disposed at an end portion of the fuel rail; and
a pulsation dampening part disposed on the rail plug to dampen pulsation generated when fuel enters the fuel rail,
wherein the rail plug includes a plug body inserted into and coupled to the end portion of the fuel rail, and
wherein the pulsation dampening part includes
a turbulent flow generating portion disposed in a direction in which the fuel flows, with respect to the rail plug; and
a coupling bridge connected to the turbulent flow generating portion for coupling the turbulent flow generating portion and the plug body with each other.
2. The pulsation dampening structure of claim 1 , wherein the rail plug comprises:
a fuel reflecting part disposed on the plug body in an inflow direction of the fuel and concavely formed in the inflow direction of the fuel such that the fuel that enters along the fuel rail is reflected and concentrated.
3. The pulsation dampening structure of claim 1 , wherein the turbulent flow generating portion is concavely formed in a direction of a fuel reflecting part to reflect the fuel, which is reflected on the fuel reflecting part, to form a vortex.
4. The pulsation dampening structure of claim 1 , wherein the coupling bridge comprises:
a first bending portion formed to protrude from the turbulent flow generating portion in a radial direction and bent in a direction toward the rail plug;
an extension portion formed to extend from the first bending portion in the direction toward the rail plug;
a second bending portion formed to bend radially outwardly at the extension portion; and
a coupling portion formed to extend from the second bending portion and configured to be coupled to the rail plug.
5. The pulsation dampening structure of claim 4 , wherein the extension portion is formed to have a length that is less than a focal distance of a curvature of a fuel reflecting part.
6. The pulsation dampening structure of claim 1 , wherein the plug body includes a plurality of coupling grooves along a circumferential direction to allow the coupling bridge to be inserted thereinto and coupled thereto.