Abstract: A bolt includes a body and a detecting portion. The body includes a shank and a head provided at one end of the shank. The detecting portion is configured to detect a strain in accordance with an axial force of the shank. The detecting portion includes a memory, a measuring portion, and a transmitting portion. The measuring portion is configured to operate by receiving a first wireless power feed, convert the strain into measurement data, and write the measurement data to the memory. The transmitting portion is configured to operate by receiving a second wireless power feed after the first wireless power feed, read the measurement data stored in the memory, and transmit the read measurement data.

Abstract: A bolt includes a head, and a shank connected to the head and having a screw portion and a leading end portion. The leading end portion of the shank includes a wall portion that defines a hole. The wall portion includes: a deformation portion configured to be plastically deformed by a torque from a fastening tool to be inserted in the hole; and a space forming portion configured to form a space between the space forming portion and the fastening tool. The blot is configured such that a maximum torque applied to the deformation portion in a process, in which a part of the deformation portion is plastically deformed by the torque from the fastening tool and is accommodated in the space and the fastening tool is placed in an idle rotation state, is configured to be set to be within a predetermined range.

Abstract: A bolt includes a head, and a shank connected to the head and having a screw portion and a leading end portion. The leading end portion of the shank includes a wall portion that defines a hole. The wall portion includes: a deformation portion configured to be plastically deformed by a torque from a fastening tool to be inserted in the hole; and a space forming portion configured to form a space between the space forming portion and the fastening tool. The blot is configured such that a maximum torque applied to the deformation portion in a process, in which a part of the deformation portion is plastically deformed by the torque from the fastening tool and is accommodated in the space and the fastening tool is placed in an idle rotation state, is configured to be set to be within a predetermined range.

Abstract: A bolt includes a body and a detecting portion. The body includes a shank and a head provided at one end of the shank. The detecting portion is configured to detect a strain in accordance with an axial force of the shank. The detecting portion includes a memory, a measuring portion, and a transmitting portion. The measuring portion is configured to operate by receiving a first wireless power feed, convert the strain into measurement data, and write the measurement data to the memory. The transmitting portion is configured to operate by receiving a second wireless power feed after the first wireless power feed, read the measurement data stored in the memory, and transmit the read measurement data.

Abstract: A head of a bolt includes a deformed portion that has a smaller thickness in an axial direction of a shank or a smaller value of Young's modulus than other portion of the head, and that is configured to be deformed more than the other portion by axial force of the shank. A detection unit of the bolt is configured to detect strain on the deformed portion depending on the axial force of the shank. The deformed portion includes a thin portion that has a thickness smaller than a largest thickness of the head in the axial direction of the shank. The head includes a recessed portion having a bottom plate serving as the thin portion. The bottom plate is positioned on an axis of the shank. The detection unit is positioned on the axis of the shank and is configured to detect strain on the bottom plate.

Abstract: A bolt is configured to be engaged by an axial-force-detective fastening tool which fastens a nut to the bolt, and at the same time, detects and axial force acting on the bolt. The bolt includes a sensor engaging surface which is engaged by the ultrasonic sensor and is recessed in a tapered opening in an end of the bolt. The tool has a socket body rotatably supported with a tool body and having a nut receiver. The socket body turns a nut received in the nut receiver around an axis of the socket body, to fasten the nut to a bolt. An ultrasonic sensor is supported with the tool body, is movable along an axis of the socket body, and is brought into contact with a sensor engaging of a front end of the bolt in the nut receiver. The ultrasonic sensor emits and receives ultrasonic waves to detect an axial force acting on the bolt. A sensor spring pushes the ultrasonic sensor to the front end of the bolt.

Abstract: An axial-force-detective fastening tool fastens a nut to a bolt, and at the same time, detects and axial force acting on the bolt. The tool has a socket body rotatably supported with a tool body and having a nut receiver. The socket body turns a nut received in the nut receiver around an axis of the socket body, to fasten the nut to a bolt. An ultrasonic sensor is supported with the tool body, is movable along an axis of the socket body, and is brought into contact with a front end of the bolt in the nut receiver. The ultrasonic sensor emits and receives ultrasonic waves to detect an axial force acting on the bolt. A sensor spring pushes the ultrasonic sensor to the front end of the bolt. The bolt includes a reference surface which is engaged by the ultrasonic sensor and is recessed in a tapered opening in an end of the bolt.

Abstract: An axial-force-detective fastening tool fastens a nut to a bolt, and at the same time, detects and axial force acting on the bolt. This tool has improved durability and workability. The tool has a socket body rotatably supported with a tool body and having a nut receiver. The socket body turns a nut received in the nut receiver around an axis of the socket body, to fasten the nut to a bolt. A driver is installed in the tool body, to rotate the socket body. An ultrasonic sensor is supported with the tool body, is movable along the axis of the socket body, and is brought into contact with a front end of the bolt in the nut receiver. The ultrasonic sensor emits and receives ultrasonic waves to detect an axial force acting on the bolt. A sensor spring pushes the ultrasonic sensor to the front end of the bolt.

Abstract: In an automotive vehicle installed with a V-6 engine, engine revolution speed and engine load are detected and a selector valve provided in a silencer is normally closed but it is opened when the engine revolution speed exceeds a predetermined engine revolution speed value when the 3rd order component of exhaust sound coincides with a longitudinal resonance frequency within a vehicle cabin when the vehicle is at acceleration. The selector valve which is normally closed is opened when the engine revolution speed exceeds a second predetermined engine revolution speed value when the 1.5th order component of the exhaust sound coincides with the longitudinal resonance frequency.

Abstract: A pair of upstanding connecting rods connected to the free ends of a U-shaped stabilizer bar are axially movably supported on respective vehicle body brackets or suspension members. A locking mechanism is provided to prevent axial movement of the connecting rods relative to the vehicle body brackets or suspension members when to make the stabilizer bar effective. A selection mechanism is mechanically connected to the locking mechanism to actuate the same to selectively prevent and allow the above mentioned axial movement of the connecting rods.