Fuel injection valve
AssigneeDenso Corporation
InventorsHiroki Tanada, Naofumi Adachi, Masayuki Suzuki, Toshiaki Hijima, Motoya Kambara
Life of this patent
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Abstract
A fuel injection valve includes a needle valve that controls communication between a high pressure chamber and an injection hole, a follower valve provided inside a control chamber controlled by fuel pressure inside an intermediate chamber, and an open-close valve that controls communication between a first passage and a low pressure passage and communication between a second passage and the low pressure passage. The fuel injection valve is configured to control the gradient of the fuel injection rate from the injection hole with an improved configuration.
Claims14
A fuel injection valve capable of controlling a gradient of a fuel injection rate, comprising:
- a main body including
- a high pressure chamber supplied with high pressure fuel,
- an injection hole configured to inject the fuel from the high pressure chamber,
- a high pressure passage supplied with the high pressure fuel,
- a control chamber connected to the high pressure passage,
- a low pressure passage that discharges low pressure fuel,
- a first passage connected to the low pressure passage,
- an intermediate chamber that connects the control chamber to the first passage, and
- a second passage that connects the control chamber to the low pressure passage;
- a needle valve configured to, based on a fuel pressure in the control chamber, allow or block communication between the high pressure chamber and the injection hole;
- a follower valve provided inside the control chamber, a lift amount of the follower valve being controlled based on a fuel pressure inside the intermediate chamber;
- and
- an open-close valve configured to
- allow or block communication between the first passage and the low pressure passage, and
- allow or block communication between the second passage and the low pressure passage;
- wherein
- the follower valve is provided with a third passage that extends through the follower valve, a first throttle that restricts fuel flow rate being provided in the third passage,
- the follower valve is configured to
- block communication between the high pressure passage and the control chamber when the control chamber is in communication with the intermediate chamber through the third passage, and
- allow communication between the high pressure passage and the control chamber when the control chamber is in communication with the intermediate chamber without passing through the third passage, and
- the second passage is in communication with the control chamber without passing through the follow valve, a second throttle that restricts fuel flow rate being provided in the second passage.
Dependencies are inferred from the claim text.