A torque control method and apparatus for bolt tightening within predetermined rounds are provided. The method includes the following steps: connecting a torque control apparatus between an air supply system and a torque tool; generating a plurality of flow sets by the torque control apparatus according to the maximum air consumption of the torque tool under loading; obtaining the highest and lowest working air pressures and the corresponding maximum and minimum torque values according to each flow set, thereby constructing a relation curve between a plurality of working air pressure values and torque values; and obtaining the maximum controlling range under a working air pressure condition that the torque tool can be normally operated according to a relation curve between a plurality of working air pressures and torque values.

A power tool includes a motor in a motor housing. A rotary shaft is rotatably driven by a motor rotor. A first bearing radially surrounds and rotatably supports a rotatable portion of an oil unit. An internal gear retaining part is disposed between the motor and the oil unit and contains planet gears that mesh with a pinion on the rotary shaft. Pins connect the planet gears to the oil unit for transmitting rotational movement to the rotatable portion of oil unit. The pins extend along axes that pass through an inner diameter of the first bearing. A case encloses the oil unit, which rotatably drives a tool holder. The oil unit is disposed axially between the motor and the tool holder. A fan is affixed to the rotary shaft on a side of the motor axially opposite of the oil unit and generates a cooling air flow.

A power tool includes a housing, a motor positioned within the housing, a controller electrically coupled to the motor, and a transmission coupled to the motor. The transmission includes a ring gear and a torque transducer coupled to the ring gear. The torque transducer is configured to transmit a torque value to the controller. The power tool further including an impulse assembly coupled to the transmission to receive torque therefrom. The controller is configured to receive a target output torque value and to determine an actual output torque based at least in part on the torque value from the torque transducer, and the controller is configured to stop operation of the motor in response to the actual output torque being within a predefined margin of the target output torque value.

A handle for a hydraulically driven tool reduces the amount of heat transmitted to the user of the tool as a result of the high temperature fluid flowing through the inner body of the handle. The inner body is formed of a heat transmissive material which has at least one channel through which the fluid flows. The handle has a number of properties which reduces heat transmission to the user, including standoffs, ribs and fastener receiving extensions.

An impact tool includes a housing, a rotating hammer arranged in the housing and rotatable by a motor, and a rotating anvil arranged in the housing and rotatable by the hammer by a series of impacts. An output shaft has a proximal end fixed to the anvil and a distal end protruding from the housing and ending with a fitting element for removable connection with an external mechanical adapter. A sensor unit includes a rotational torque sensor for detecting a torque of the shaft. The torque sensor includes at least one extensometric transducer fixed to an outer surface of a cylindrical portion of the distal end adjacent to the fitting element to detect a deformation signal that is proportional to a deformation of the outer surface when the shaft is rotated and indicative of the torque. The sensor unit further includes a rotating electronic module connected to the extensometric transducer and includes a microprocessor for conditioning the deformation signal, the rotating electronic module being shaped in such a manner to surround the cylindrical portion and mounted to rotate integrally with the rotating output shaft.

A pneumatic screw driving device includes a terminal element intended to cooperate with an element to be tightened/untightened and a body. The body houses: a pneumatic motor capable of rotationally driving the terminal element; an air intake into the motor; and a setting element for setting an intake section of the air intake into the motor. The setting element can take at least: a fixed state in which the intake section is fixed; and a setting state in which the intake section is adjustable between at least two values.

A one-way inertial rotational device includes: a rotary seat; an inertial member pivotally rotatably disposed on the circumference of the rotary seat via a pivot hole, a circumference of the rotary seat and a hole wall of the pivot hole of the inertial member being defined as a first circumferential face and a second circumferential face; and a one-way transmission mechanism having at least one one-way transmission tooth, at least one elastic member and multiple engagement teeth. The engagement teeth are annularly disposed on the second circumferential face. The transmission tooth is displaceably disposed on the first circumferential face. The elastic member keeps the transmission tooth engaged with the engagement teeth. Each engagement tooth has a tooth crest and a tooth height. The width of the tooth crest is larger than the tooth height so that the loss of the rotational energy is reduced to achieve greater rotational torque.

A drive system for an industrial tool (e.g., a hydraulic torque wrench) includes a cylinder, a first piston, a first rod, a second piston, and a second rod. The cylinder includes a first end, a second end, and a longitudinal axis extending therebetween. The first piston is disposed within the cylinder and movable along the longitudinal axis. The first rod is coupled to the first piston and extends toward the first end of the cylinder. The second piston is disposed within the cylinder and movable along the longitudinal axis. The second rod is coupled to the second piston and extends toward the first end of the cylinder.

An inertial rotational tightening device includes: a rotationally drivable main body, an annular engagement section being disposed on a circumference of the main body; an inertial member having an engagement hole axially formed through the inertial member, the engagement hole of the inertial member being detachably engaged with the engagement section of the main body, a retaining groove being formed on a circumference of the engagement section or a hole wall of the engagement hole, an insertion groove being formed on the hole wall of the engagement hole or the circumference of the engagement section; and an elastic retainer member inlaid and buckled in the retaining groove and the insertion groove. The inertial member is detachably connected with the main body. Different inertial members with different mass can be selectively mounted on the main body to change the moment of inertia and the rotational torque of the rotational tightening device.

Provided are: an impact fastening tool which prevents a torque detector from missing a signal and extends service life by adopting a fixed connector that prevents the trouble of being instantaneously separated (bounced) from a rotating electrode by intermittent impacts and has a shape allowing the progression of friction to be delayed structurally; and a torque tester. Both end portions of the fixed connector are fixed, and at least two protrusion portions are formed between the both end portions. The rotating electrode is disposed between one protrusion portion and the other protrusion portion such that the rotating electrode contacts the fixed connector at two or more points or in a line form. A signal required for the torque detecting means is transmitted through the contact between the rotating electrode and the fixed connector.