Piston rod piston detector, autotensioner and belt tension adjuster

A belt tension adjusting device comprising an inner member supported so as to be pivotable about a fixing bolt passing through an eccentric hole formed in said inner member, a tension pulley rotatably mounted on said inner member, a tension adjusting spring and a hydraulic damper for pivoting said inner member and thus said tension pulley to adjust tension of a belt, and a magnetic sensor for detecting the position of said tension pulley,

• wherein said tension adjusting spring is accommodated in said inner member, wherein a magnet is mounted inside said tension adjusting spring so as to move as said tension adjusting spring shrinks and expands, said magnetic sensor being fixed to said inner member to detect the position of said tension pulley.

A belt tension adjusting device comprising an inner member supported so as to be pivotable about a fixing bolt passing through an eccentric hole formed in said inner member, a tension pulley rotatably mounted on said inner member, a tension adjusting spring and a hydraulic damper for pivoting said inner member and thus said tension pulley to adjust tension of a belt, and a magnetic sensor for detecting the position of said tension pulley,

• wherein said tension adjusting spring is accommodated in said inner member, wherein two magnets having different polarities are mounted inside said tension adjusting spring so as to move as said tension adjusting spring shrinks and expands, said magnetic sensor being fixed to said inner member to detect the position of said tension pulley.

A belt tension adjusting device comprising an inner member supported so as to be pivotable about a fixing bolt passing through an eccentric hole formed in said inner member, a tension pulley rotatably mounted on said inner member, a tension adjusting spring and a hydraulic damper for pivoting said inner member and thus said tension pulley to adjust tension of a belt, and a magnetic sensor for detecting the position of said tension pulley,

• wherein said tension adjusting spring is accommodated in said inner member, wherein a magnet is mounted on a pin supporting said tension adjusting spring, and wherein said magnetic sensor is fixed to said inner member so as to move relative to said magnet as said inner member pivots, to thereby detect the position of said inner member.

A belt tension adjusting device comprising an inner member supported so as to be pivotable about a fixing bolt passing through an eccentric hole formed in said inner member, a tension pulley rotatably mounted on said inner member, a tension adjusting spring and a hydraulic damper for pivoting said inner member and thus said tension pulley to adjust tension of a belt, and a magnetic sensor for detecting the position of said tension pulley,

• wherein said tension adjusting spring is accommodated in said inner member, wherein a magnet is mounted on a pin provided on said inner member so as to support a rod which protrudes from said hydraulic damper, wherein said magnetic sensor is fixed to said hydraulic damper to detect the position of said tension pulley.

A belt tension adjusting device comprising an inner member supported so as to be pivotable about a fixing bolt passing through an eccentric hole formed in said inner member, a tension pulley rotatably mounted on said inner member, a tension adjusting spring and a hydraulic damper for pivoting said inner member and thus said tension pulley to adjust tension of a belt, and a magnetic sensor for detecting the position of said tension pulley,

• wherein said tension adjusting spring is accommodated in said inner member, wherein two magnets having different polarities are mounted on said inner member, and wherein said magnetic sensor is fixed to said hydraulic damper to detect the position of said tension pulley.

A belt tension adjusting device comprising an inner member supported so as to be pivotable about a fixing bolt passing through an eccentric hole formed in said inner member, a tension pulley rotatably mounted on said inner member, a tension adjusting spring and a hydraulic damper for pivoting said inner member and thus said tension pulley to adjust tension of a belt, and a magnetic sensor for detecting the position of said tension pulley,

• wherein said tension adjusting spring is accommodated in said inner member, wherein a tapered magnet is mounted on said inner member, and wherein said magnetic sensor is fixed to said hydraulic damper to detect the position of the tension pulley.

A belt tension adjusting device comprising an inner member supported so as to be pivotable about a fixing bolt passing through an eccentric hole formed in said inner member, a tension pulley rotatably mounted on said inner member, a tension adjusting spring and a hydraulic damper for pivoting said inner member and thus said tension pulley to adjust tension of a belt, and a magnetic sensor for detecting the position of said tension pulley,

• wherein an output signal of said magnetic sensor is sent to a control circuit and a temperature sensor is provided parallel to said magnetic sensor, an output of said temperature sensor being sent to said control circuit for temperature compensation of the output signal of said magnetic sensor.

A belt tension adjusting device comprising an inner member supported so as to be pivotable about a fixing bolt passing through an eccentric hole formed in said inner member, a tension pulley rotatably mounted on said inner member, a tension adjusting spring and a hydraulic damper for pivoting said inner member and thus said tension pulley to adjust tension of a belt, and a magnetic sensor for detecting the position of said tension pulley,

• wherein a magnet is provided so as to move along a straight line that passes said magnetic sensor, a straight line parallel thereto, or a rotation locus relative to said magnetic sensor, and mounted such that a gap between said magnet and said magnetic sensor changes as the belt stretches.

A belt tension adjusting device comprising an inner member supported so as to be pivotable about a fixing bolt passing through an eccentric hole formed in said inner member, a tension pulley rotatably mounted on said inner member, a tension adjusting spring and a hydraulic damper for pivoting said inner member and thus said tension pulley to adjust tension of a belt, and a magnetic sensor for detecting the position of said tension pulley,

• wherein an output signal of said magnetic sensor is sent to a control circuit and a temperature sensor is provided parallel to said magnetic sensor, an output of said temperature sensor being sent to said control circuit for temperature compensation of the output signal of said magnetic sensor.