Piston cooling device
AssigneeToyota Jidosha Kabushiki Kaisha
InventorAkira Yamashita
Life of this patent
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Abstract
A cooling cavity is provided inside a piston of an internal combustion engine. Inlet/outlet holes of the cooling cavity are provided in a bottom surface of the piston. A first oil jet that sprays oil toward the inlet/outlet hole, a second oil jet that sprays oil toward a part different from the inlet/outlet hole are included. The first oil jet is caused to spray oil in preference to the second oil jet.
Claims18
A piston cooling device that is installed in an internal combustion engine, the piston cooling device comprising:
- a cooling cavity that is provided inside a piston, and includes an inlet/outlet hole that opens on a bottom surface of the piston;
- a first oil jet that sprays oil toward the inlet/outlet hole;
- a second oil jet that sprays oil toward a part different from the inlet/outlet hole;
- a valve or a pump that supplies the oil that is sprayed from the second oil jet;
- and
- an electronic control unit configured to control the valve or the pump such that the first oil jet sprays oil in preference to the second oil jet, wherein the first oil jet sprays oil to the inlet/outlet hole and thereafter the second oil jet sprays oil to the part different from the inlet/outlet hole.
A piston cooling device that is installed in an internal combustion engine, the piston cooling device comprising:
- a cooling cavity that is provided inside a piston, and includes an inlet/outlet hole that opens on a bottom surface of the piston;
- a first oil jet that sprays oil toward the inlet/outlet hole;
- and
- a second oil jet that sprays oil toward a part different from the inlet/outlet hole, wherein
- the first oil jet comprises a first check valve configured to open at a first valve opening pressure, and
- the second oil jet comprises a second check valve configured to open at a second valve opening pressure that is higher than the first valve opening pressure such that the first oil jet sprays oil in preference to the second oil jet, wherein the first oil jet sprays oil to the inlet/outlet hole and thereafter the second oil jet sprays oil to the part different from the inlet/outlet hole.
Dependencies are inferred from the claim text.