Pressure switch
A pressure switch is equipped with a pressure sensor, a housing that houses the pressure sensor, an annular seal member arranged in a hole of the housing and which is interposed between the pressure sensor and the housing, and a pressing member that is fixed to the housing. The pressing member includes a base section that faces the seal member, and engagement arms that extend from the base section, are elastically deformable, and engage with the housing.
1. A pressure switch comprising:
a pressure sensor;
a housing configured to include a hole in which a portion of the pressure sensor is inserted, and to house the pressure sensor;
an annular seal member arranged in the hole and being interposed between the pressure sensor and the housing; and
a pressing member including a base section configured to face the seal member, and an elastically deformable engagement arm extending from the base section, and configured to engage with the housing,
wherein:
a first engagement member is disposed on the engagement arm;
the housing includes a tubular wall configured to surround the hole;
a second engagement member is disposed on an outer circumference of the tubular wall, and configured to engage with the first engagement member;
the housing includes a bottom portion;
the tubular wall projects from the bottom portion toward the pressure sensor along an axis of the hole;
the engagement arm extends from the base section toward the bottom portion of the housing and engages with the outer circumference of the tubular wall;
the pressure sensor includes a base member; and
the base section of the pressing member is arranged between the seal member and the base member of the pressure sensor.
2. The pressure switch according to claim 1 , wherein:
one of the first engagement member and the second engagement member is in form of a hole or a groove; and
another of the first engagement member and the second engagement member is in form of a projection that is inserted into the hole or the groove.
3. The pressure switch according to claim 1 , wherein:
the hole includes in one end thereof a first opening into which the portion of the pressure sensor is inserted, and includes a second opening in another end thereof on an opposite side from the one end;
a projection is disposed on the outer circumference of the tubular wall; and
on the projection, a tapered guide is formed, which is inclined so as to move away from the axis of the hole, from a side of the first opening toward a side of the second opening.
4. The pressure switch according to claim 1 , wherein:
a through hole in which the portion of the pressure sensor is inserted is provided in the base section; and
a pair of engagement arms is provided on both sides of the base section.