Fuel injection pump
AssigneeDenso Corporation
InventorNaoya Tamai
Life of this patent
Estimating the term…
Abstract
A fuel injection pump pressurizes and injects fuel. A cam rotates about a rotational axis of the cam. A housing includes a cam chamber that houses the cam and a sliding chamber communicated to the cam chamber. A roller rotates while being in contact with a surface of the cam. A shoe reciprocates in the sliding chamber by rotation of the cam and is in contact with and slides on a surface of the roller. A plunger reciprocates with the shoe. A cylinder houses the plunger and includes a pump chamber to pressurize and feed the fuel by reciprocation of the plunger. A deformed section is a groove or a protrusion which extends in a direction of a rotational axis of the cam, on a part of a surface of the cam, and has a shape different from a cam profile of the cam.
Claims13
A fuel injection pump to pressurize and inject fuel, the fuel injection pump comprising:
- a cam configured to rotate about a rotational axis of the cam and that includes a cam ridge;
- a housing configured to be supplied with lubricating oil and that includes a cam chamber that houses the cam and a sliding chamber communicated to the cam chamber;
- a roller configured to be in contact with and rotate on a surface of the cam;
- a shoe that is configured to be in contact with and slide on a surface of the roller on a side opposite to the cam and configured to reciprocate in the sliding chamber by rotation of the cam;
- a plunger configured to reciprocate with the shoe;
- a cylinder that houses the plunger and includes a pump chamber to pressurize and feed the fuel by reciprocation of the plunger;
- and
- a deformed section that is a groove or a protrusion formed on a part of the surface of the cam and extending in a direction of the rotational axis of the cam, the deformed section having a shape different from a cam profile of the cam which contributes to pressurizing and feeding of the fuel, wherein
- the deformed section includes a plurality of deformed sections formed in an area of the surface of the cam, the area contributing to a suction stroke.
A fuel injection pump to pressurize and inject fuel, the fuel injection pump comprising:
- a cam configured to rotate about a rotational axis of the cam and that includes a cam ridge;
- a housing configured to be supplied with lubricating oil and that includes a cam chamber that houses the cam and a sliding chamber communicated to the cam chamber;
- a roller configured to be in contact with and rotate on a surface of the cam;
- a shoe that is configured to reciprocate in the sliding chamber by rotation of the cam, the shoe configured:
- to be in contact with and slide on a surface of the roller on a side opposite to the cam, and
- to be separate from the surface of the roller;
- a plunger configured to reciprocate with the shoe;
- a cylinder that houses the plunger and includes a pump chamber to pressurize and feed the fuel by reciprocation of the plunger;
- and
- a deformed section that is a groove or a protrusion formed on a part of the surface of the cam and extending in a direction of a rotational axis of the cam, the deformed section having a shape different from a cam profile of the cam which contributes to pressurizing and feeding of the fuel, wherein
- the deformed section includes a plurality of deformed sections formed in an area of the surface of the cam, the area contributing to a suction stroke.
Dependencies are inferred from the claim text.