Throttle on a valve needle of a fuel injection valve for internal combustion engines

Throttle on a valve needle of a fuel injection valve for internal combustion engines

  • CN 101,743,394 B
  • Filed: 06/13/2008
  • Issued: 06/24/2015
  • Est. Priority Date: 07/13/2007
  • Status: Active Grant
First Claim
Patent Images

1. for the Fuelinjection nozzle of internal-combustion engine, there is a valve body (1), a pressure chamber (5) is configured with in this valve body (1), one needle (3) is arranged in this pressure chamber (5) with longitudinal movement, this needle (3) is configured in sealing surface (11) on this needle (3) and a valve seat (7) mating reaction with one, this valve seat (7) forms the border of this pressure chamber (5), wherein, the flow in fuel of at least one spray-hole (8) can be realized or interrupt by described needle (3) and the mating reaction of described valve seat (7), wherein, this flow in fuel flows to described spray-hole (8) through described needle (3) and the wall of described pressure chamber (5), it is characterized in that, the gap throttle valve (15) of a sharp edge is configured with between described needle (3) and the wall of described pressure chamber (5), it is characterized in that, described needle (3) is configured with a flange (17), this flange (17) has a sharp keen seamed edge (20) on its outward edge, thus between described flange (17) and the wall of described pressure chamber (5), construct the gap throttle valve (15) of described sharp edge, the gap throttle valve (15) of described sharp edge satisfies condition L/DHyd <

  • 5, wherein, L is the length in described gap throttle valve (15), and DHyd is hydraulic diameter (DHyd).

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