Electric motor for construction machinery, and cooling circuit for electric motor
AssigneeKomatsu Ltd.
InventorsYasuhiko Matsuki, Masanori Minagawa
Life of this patent
Estimating the term…
Abstract
A cooling circuit for an electric motor for a construction machine includes a circulation line that includes a shaft-side line disposed in a rotor shaft of the electric motor, a pump that supplies cooling fluid to the circulation line, a first filter disposed between the pump and the shaft-side line in the circulation line, a first bypass line that bypasses the first filter so as to connect an upstream side and a downstream side of the first filter, and a first relief valve disposed in the first bypass line.
Claims10
A cooling circuit for an electric motor for a construction machine, the cooling circuit comprising:
- a circulation line that includes a shaft-side line disposed in a rotor shaft of the electric motor;
- a pump that supplies cooling fluid to the circulation line;
- a first filter disposed between the pump and the shaft-side line in the circulation line;
- a first bypass line that bypasses the first filter so as to connect an upstream side and a downstream side of the first filter;
- and
- a first relief valve disposed in the first bypass line.
An electric motor that rotates an upper rotary body of a construction machine, comprising:
- a rotor shaft that is supported at opposite ends thereof by bearings, the electric motor being mounted on the construction machine such that the rotor shaft vertically extends;
- and
- a cooling circuit for cooling the electric motor, the cooling circuit comprising:
- a cooling fluid inlet port through which the cooling fluid is introduced;
- a port communication line that communicates with the cooling fluid inlet port;
- a filter line that accommodates a filter and communicates with the port communication line, the filter being configured to filter the cooling fluid;
- a shaft-side line disposed in the rotor shaft;
- a connection line that is disposed directly above the rotor shaft and extends in an axial direction of the rotor shaft so as to connect the filter line to the shaft-side line;
- a bypass line that bypasses the filter so as to connect an upstream side and a downstream side of the filter;
- and
- a relief valve disposed in the bypass line, and
- wherein the cooling fluid inlet port, the port communication line, the filter line, the filter, the bypass line, and the relief valve are disposed within the electric motor.
An electric motor that rotates an upper rotary body of a construction machine, comprising:
- a rotor shaft that is supported at opposite ends thereof by bearings, the electric motor being mounted on the construction machine such that the rotor shaft vertically extends;
- and
- a cooling circuit for cooling the electric motor, the cooling circuit comprising:
- a cooling fluid inlet port through which the cooling fluid is introduced;
- a port communication line that communicates with the cooling fluid inlet port;
- a filter line that accommodates a filter and communicates with the port communication line, the filter being configured to filter the cooling fluid;
- a shaft-side line disposed in the rotor shaft;
- a connection line that is disposed directly above the rotor shaft and extends in an axial direction of the rotor shaft so as to connect the filter line to the shaft-side line;
- a bypass line that bypasses the filter so as to connect an upstream side and a downstream side of the filter;
- and
- a relief valve disposed in the bypass line, and
- wherein the cooling fluid inlet port, the port communication line, the filter line, the filter, the bypass line, and the relief valve are disposed in a same plane in the electric motor.
Dependencies are inferred from the claim text.