Valve body, electronic control throttle body, motor-driven throttle body, and valve device

A valve device comprising:

• a passage member in which a fluid passage is formed;
• a shaft which is rotatably supported by a bearing fixed to the passage member;
• and
• a valve which is fixed to the shaft and controls a passage cross-sectional area of the fluid passage by rotation of the shaft, wherein
• the passage member is integrally formed with a refrigerant passage,
• the valve is a throttle valve, the fluid passage is an intake passage, and the cooling medium is an engine coolant,
• the shaft extends across the intake passage,
• the bearing rotatably supporting the shaft is formed of a pair of bearings facing each other with the intake passage sandwiched therebetween,
• the refrigerant passage surrounds an outer side of a wall surface forming the intake passage and is formed as an annular passage that is formed between the intake passage and an outer wall integrally formed with the passage member, and
• inlet and outlet portions of an engine coolant are formed in the refrigerant passage connecting the pair of bearings.

A motor-driven throttle body formed with an intake passage whose passage cross-sectional area is controlled by rotation of a throttle valve driven by a motor, the throttle body comprising:

• a pair of bearing fixing portions to which a pair of bearings axially supporting a throttle shaft to which the throttle valve is fixed;
• an accommodating portion in which functional parts, configured to drive the throttle valve including at least the motor and a spring that biases the throttle valve in a rotational direction, are accommodated so as to surround one bearing fixing portion between the pair of bearing fixing portions;
• and
• a cover attached to the throttle body so as to cover the functional parts, wherein
• an engine coolant passage, which guides an engine coolant, is formed integrally with the throttle body to be adjacent to walls of the bearing fixing portions,
• the bearing and the engine coolant are configured to be capable of transferring heat through the walls of the bearing fixing portions, and
• a cross-sectional area of the engine coolant passage close to the bearing fixing portion on a side opposite to the accommodating portion is configured to be larger than a cross-sectional area of the engine coolant passage close to the bearing fixing portion on a side of the accommodating portion.

A motor-driven throttle body, which is installed upstream of an intercooler and formed with an intake passage whose passage cross-sectional area is controlled by rotation of a throttle valve driven by a motor, the throttle body comprising:

• a pair of bearing fixing portions to which a pair of bearings axially supporting a throttle shaft to which the throttle valve is fixed;
• an accommodating portion in which functional parts, configured to drive the throttle valve including at least the motor and a spring that biases the throttle valve in a rotational direction, are accommodated so as to surround one bearing fixing portion between the pair of bearing fixing portions;
• and
• a cover attached to the throttle body so as to cover the functional parts,
• wherein an engine coolant passage, which guides an engine coolant, is formed integrally with the throttle body to be adjacent to walls of the bearing fixing portions,
• the bearing and the engine coolant are configured to be capable of transferring heat through the walls of the bearing fixing portions,
• the engine coolant passage is formed as an annular passage which surrounds an outer side of a wall surface forming the intake passage and is formed between an outer wall integrally formed with a passage member and the wall surface,
• an inlet pipe for guiding the engine coolant and an outlet pipe for discharging the engine coolant heated from a space are connected to the engine coolant passage, and
• the inlet pipe is provided on a side closer to the bearing fixing portion on a side of the accommodating portion and the outlet pipe is provided on a side closer to the bearing fixing portion on a side opposite to the accommodating portion.