US 11,549,460 B2Granted

Water cooled engine

AssigneeKubota Corporation

InventorsSatoshi Sugimoto, Yusuke Komemushi, Naoki Wada

Life of this patent

Estimating the term…

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Abstract

There is provided a water cooled engine including a cylinder head with minimized thermal strain. A head water jacket includes an inter-exhaust-port-wall water channel between a first exhaust entrance port wall and a second exhaust entrance port wall. A cylinder head includes a cooling water injection passage provided at a bottom wall of the cylinder head. The cooling water injection passage is positioned on the exhaust end side, and includes a passage entrance provided on the exhaust end side, and a passage exit directed toward the inter-exhaust-port-wall water channel. An exhaust port wall includes a heat dissipation fin extending from a first exhaust entrance port wall toward an exhaust end. The space between the heat dissipation fin and a second exhaust entrance port wall forms a water channel entrance of the inter-exhaust-port-wall water channel.

Claims15

Dependent claims

A water cooled engine comprising a cylinder head, the cylinder head including an air intake port, an exhaust port, and a head water jacket that allows an engine cooling water to pass around the ports, wherein

when an extending direction of a crankshaft is a front-rear direction and a width direction of the cylinder head being perpendicular to the front-rear direction is a lateral direction, a laterally one end of the cylinder head is an exhaust end and a laterally other end of the cylinder head is an air intake end,
the cylinder head includes a cooling water injection passage provided at a bottom wall of the cylinder head, the cooling water injection passage being positioned on the exhaust end side, and is configured to inject the engine cooling water into the head water jacket,
the cylinder head includes an intake valve shaft insertion boss, a push rod chamber wall provided on the exhaust end side at a position opposing to the intake valve shaft insertion boss, and an extending heat dissipation fin extending from the push rod chamber wall to the intake valve shaft insertion boss.

Dependencies are inferred from the claim text.

Facts

Application: 16/859,554Filed 27 Apr 2020 · continuation
Priority: JP JP2017-12830230 Jun 2017
Published: US 2020/0256279 A113 Aug 2020
Granted: 10 Jan 2023
Term ends: Not estimatedThe source records don’t support an estimate.

Classification11 codes

F02F 1/40
For liquid cooling: cylinder heads with means for directing, guiding, or distributing liquid stream
F01P 3/02
Liquid cooling: arrangements for cooling cylinders or cylinder heads
F01P 3/14
Arrangements for cooling other engine or machine parts: for cooling intake or exhaust valves
F01P 3/16
Arrangements for cooling other engine or machine parts: for cooling fuel injectors or sparking-plugs

Family

Application15/987,980Parent of this continuation · filed 24 May 2018
US 2020/0256279 A1Pre-grant publication · published 13 Aug 2020
US 10,669,968 B2Parent of this continuation
US 2019/0003416 A1Published application
US 11,549,460 B2This patent

From the US filing history. Foreign family members aren’t listed.