Pressure sensor
A pressure sensor includes a connection portion provided with a screw portion configured to fix the pressure sensor to a combustion chamber of a vehicle engine; a hollow liquid-enclosing container fixed to one end of the connection portion; a pressure transmission fluid enclosed inside the liquid-enclosing container; a diaphragm fixed to one end of the liquid-enclosing container and elastically deformed when receiving pressure to transmit the pressure to the pressure transmission fluid; a pressure detection element fixed to the other end of the liquid-enclosing container and detecting the pressure transmitted to the pressure transmission fluid and converts the detected pressure into an electric signal; and a heat-dissipating rod provided inside the liquid-enclosing container. The connection portion and the liquid-enclosing container, and the connection portion and the diaphragm are mechanically connected to each other by welding or the like.
1. A pressure sensor comprising:
a hollow liquid-enclosing container;
a pressure transmission fluid that is enclosed inside the liquid-enclosing container;
a diaphragm that is attached to the liquid-enclosing container and is elastically deformed when receiving pressure to transmit the pressure to the pressure transmission fluid;
a pressure detection element that is attached to the liquid-enclosing container, and detects the pressure transmitted to the pressure transmission fluid and converts the detected pressure into an electric signal; and
a heat dissipation member that is attached inside the liquid-enclosing container so as to be in contact with each of a part of an inner wall of the liquid-enclosing container and the pressure transmission fluid.
2. The pressure sensor according to claim 1 , wherein
a surface of the heat dissipation member is formed as an uneven surface.
3. The pressure sensor according to claim 2 , wherein
a plurality of grooves is provided on the surface of the heat dissipation member.
4. The pressure sensor according to claim 1 , further comprising
a first heat-dissipating structural body that surrounds the heat dissipation member and is in contact with each of the part of the inner wall of the liquid-enclosing container and the pressure transmission fluid.
5. The pressure sensor according to claim 4 , wherein
the first heat-dissipating structural body consists of a mesh-shaped or fibrous thin plate.
6. The pressure sensor according to claim 1 , further comprising
a connection member that is connected to the liquid-enclosing container and has a screw portion configured to fix the liquid-enclosing container to a combustion chamber of an engine.
7. A pressure sensor comprising:
a hollow liquid-enclosing container;
a pressure transmission fluid that is enclosed inside the liquid-enclosing container;
a diaphragm that is attached to the liquid-enclosing container and is elastically deformed when receiving pressure to transmit the pressure to the pressure transmission fluid; and
a pressure detection element that is attached to the liquid-enclosing container, and detects the pressure transmitted to the pressure transmission fluid and converts the detected pressure into an electric signal,
wherein an inner wall of the liquid-enclosing container is formed as an uneven surface, the inner wall being in contact with the pressure transmission fluid, or
the pressure sensor further comprises a second heat-dissipating structural body that surrounds a part of the inner wall of the liquid-enclosing container and is in contact with a part of the inner wall.
8. The pressure sensor according to claim 7 , wherein
a plurality of grooves is provided on the inner wall of the liquid-enclosing container.
9. The pressure sensor according to claim 7 , wherein
the second heat-dissipating structural body consists of a mesh-shaped or fibrous thin plate.
10. The pressure sensor according to claim 7 , further comprising
a connection member that is connected to the liquid-enclosing container and has a screw portion configured to fix the liquid-enclosing container to a combustion chamber of an engine.