Komatsu Corporation

Makoto Nobayashi

Makoto Watanabe

Yasuhiro Kamoshida

Kazuya Matsumoto

Sohei Iwamoto

An engine cooling device includes: a flow path switching unit provided between an engine and an EGR cooler and the radiator and between the engine and the EGR cooler and a pump. The flow path switching unit includes a first valve that allows a cooling water to flow through a first bypass flow path extending toward the pump when a temperature of the cooling water is lower than a first temperature and that allows the cooling water to flow through a radiator connection flow path, a second valve that allows the cooling water to flow through the first bypass flow path when the temperature of the cooling water is less than a second temperature that is higher than the first temperature, and allows the cooling water to flow through the radiator connection flow path when the temperature of the cooling water is equal to or higher than the second temperature.

Engine cooling device and engine system

Provided is an engine cooling device in which a flow passage switching part, which is provided between an outlet (EFb) of a cooling flow passage (EF) and a radiator and between the outlet (EFb) of the cooling flow passage (EF) and a pump, has valves that perform switching to a radiator connection flow passage or a bypass flow passage according to a temperature of a coolant (W), and a sleeve that is connected in parallel to the valves and is configured to circulate the coolant (W) to both the bypass flow passage and the radiator connection flow passage.

Growing community of inventors

Tokyo, Japan

Makoto Nobayashi