JP2014221498A - Semiautomatic torque wrench - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a semiautomatic torque wrench capable of improving accuracy of fastening torque and capable of being used easily.SOLUTION: A drive source 21 and a power transmission part 22 are disposed in a cylindrical part. An output shaft 26 of the power transmission part 22 is disposed on a tip end of the cylindrical part. A power drive part 3 having a tail end part of the cylindrical part as a grip part 11, a head part 51 and a lever part 52 are also disposed. The head part 51 sets fastening force outputted from the output shaft 26 as a first input part, and fastening force outputted from the lever part 52 as a second input part, and applies the fastening force to a fastening body. A torque wrench body part 5 in which a torque limiter 54 operates when the fastening body is fastened with a predetermined torque value by the fastening force outputted from the lever part 52 and a torque wrench support part 13 for holding the tail end part of the torque wrench body part 5, and transmitting the fastening force by manual force to the lever part 52 via the cylindrical part, are also provided.

Description

  The present invention relates to a semi-automatic torque wrench that temporarily tightens a fastening body such as a bolt by electric drive and then tightens the fastening body to a target torque value by manual operation.

  The semi-automatic torque wrench is equipped with an automatic drive mechanism that uses an electric motor as a drive source in addition to a manual torque wrench. For example, when a fastening body such as a bolt is seated on a body to be fastened and reaches a temporary fastening torque value, the electric motor Stops energization and ends automatic driving. Thereafter, the torque wrench is manually operated to tighten the fastening body with a target torque value (Patent Document 1).

  By the way, the semi-automatic torque wrench is suspended in a production line such as a factory, and it is generally performed to move the semi-automatic torque wrench to the fastening position of the fastening body and perform the tightening work.

  In consideration of such usage, a semi-automatic torque wrench that is easier to use, such as good operability and low fatigue even during long-time work, is desired. It is also desired to further improve the accuracy of the tightening torque.

JP 2009-95961 A

  An object of the present invention is to provide a semi-automatic torque wrench that has good operability, is easy to use such as less fatigue even during long-time work, and can further improve the accuracy of tightening torque.

  A configuration of a semi-automatic torque wrench that solves the problems of the present invention includes a drive source and a power transmission unit arranged in a linear cylindrical part, and an output shaft of the power transmission part at a tip of the cylindrical part, A power drive unit having a grip portion at the tail end of the tube unit, a head unit and a lever unit, wherein the head unit uses a tightening force from the output shaft as a first input unit, and a tightening force from the lever unit; And a torque wrench main body for operating a torque limiter when a fastening force is applied to the fastening body as a second input portion and the fastening body is tightened with a predetermined torque value by the tightening force from the lever portion, and the torque wrench main body And a torque wrench support portion that transmits a tightening force by hand force to the lever portion via the cylindrical portion.

  According to the first aspect of the present invention, it is possible to provide a torque wrench having a good balance of the torque wrench and less fatigue even during long-time work when the torque wrench is used while being suspended. In addition, after the fastening body is temporarily tightened while the grip portion of the power drive unit is being gripped, the main tightening can be performed by a manually operated torque wrench main body portion, and good operability can be obtained.

  According to the invention which concerns on Claim 2, since a start lever part can be operated in the natural state which grasped the grip part, operativity improves. In particular, in a configuration in which the start lever portion is arranged before the manual power line and the index finger is operated by placing the index finger on the start lever portion, an operation such as re-gripping the grip portion is required during the final tightening by manual force. On the other hand, in the present invention, it is possible to perform operations from temporary tightening to final tightening without changing the state of gripping the grip portion.

  According to the third and fourth aspects of the invention, the switch portion can be reduced in size, resistant to dust and oil, and further durable, and high reliability and long life can be obtained.

  According to the invention which concerns on Claim 5, it is durable compared with a brush motor, and a long life is obtained by maintenance-free. Further, it is less expensive than an expensive servo motor, and the control circuit can be downsized.

  According to the invention which concerns on Claim 6, the operator can know the operating state of a torque wrench by the display color of LED lamp, lighting, and blinking.

  According to the invention which concerns on Claim 7, compared with the case where the control circuit part is arrange | positioned outside, the number of cores of a cable wire can be reduced, the outside diameter of a cable can be made small, and the miniaturization of a connector is possible. Further, since the outer diameter of the cable is reduced, the weight of the cable and the tightening workability are improved.

  According to the invention which concerns on Claim 8, the cable line with the exterior is unnecessary and operativity improves.

  According to the invention which concerns on Claim 9, 10, a torque limiter can be operated without trouble.

  According to the eleventh aspect of the present invention, automatic driving and manual tightening can be performed with a simple configuration.

  According to the twelfth aspect of the present invention, it is possible to provide a semi-automatic torque wrench that is compact, has a good balance, and has good operability.

It is a figure which shows 1st Embodiment of the semiautomatic type torque wrench by this invention, (a) is a top view, (b) is a front view. (A) is AA arrow sectional drawing of FIG.1 (b), (b) is BB arrow expanded sectional view of FIG.1 (b), (c) is an expanded sectional view of a rotatable mechanism. It is a figure which shows 2nd Embodiment of the semiautomatic type torque wrench by this invention, (a) is a front view, (b) is CC arrow directional view of (a).

  Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

First Embodiment FIG. 1 is a diagram showing a semi-automatic torque wrench showing a first embodiment, where (a) is a top view, (b) is a front view, and FIG. 2 (a) is an AA arrow in FIG. 1 (b). FIG. 2B is an enlarged cross-sectional view of the rotatable mechanism, and FIG. 1B is an enlarged cross-sectional view of the rotatable mechanism.

  1 and 2, the semi-automatic torque wrench 1 of the present embodiment includes an electric drive unit 3 and a torque wrench main body 5. Further, the semi-automatic torque wrench 1 of the present embodiment is a battery-mounted semi-automatic torque wrench in which the battery 7 is detachably (replaceable).

  The electric drive unit 5 includes a cylindrical casing 10, a cylindrical grip portion 11 connected to the rear end portion of the casing 10, and a cylindrical tip bent into an L shape connected to the front end portion of the casing 10. A cylindrical portion 12 is provided. The grip portion 11 is formed with a fitting portion 13 having a cylindrical tapered hole into which the cylindrical rear end portion of the torque wrench main body portion 5 is fitted.

  In this embodiment, the casing 10 and the grip part 11, and the casing 10 and the front-end | tip cylinder part 12 are screw-coupled respectively. Further, the battery 7 is detachably attached to the rear end portion of the grip portion 11.

  In the casing 10, an electric motor 21 that is a drive source and a power transmission unit 22 configured by a speed reduction mechanism at the front portion of the electric motor 21 are arranged in series. The electric motor 21 uses a brushless motor. The motor shaft of the electric motor 21 is connected to the input unit of the power transmission unit 22. The power transmission part 22 can illustrate the structure which connected the reduction gear comprised by a planetary gear mechanism, for example in multiple stages in series, and has arrange | positioned the motor shaft, the input part, and the output part of the electric motor 21 on the same axis line. . The power transmission unit 22 can be configured to mechanically switch the reduction ratio by providing a speed change clutch (not shown).

  In the distal end cylindrical portion 12, a pair of bevel gears 23 and 24 meshing with each other, an input shaft portion 25 provided with one bevel gear 23 at the distal end, and an output shaft portion 26 provided with the other bevel gear 24 at the distal end Is placed. The input shaft portion 25 is connected to the output portion of the power transmission portion 22 and transmits the rotation input from the power transmission portion 22 to the output shaft portion 26 whose axis intersects at right angles via a pair of bevel gears 23 and 24. To do.

  The tip cylinder part 12 has a first cylinder part 27 that rotatably supports the input shaft part 25 and a second cylinder part 28 that rotatably supports the output shaft part 26. A screw portion 29 is formed on the rear end side outer peripheral portion of the first tube portion 27 and is screwed into a screw portion 30 formed on the front end side inner peripheral portion of the casing 10. Further, a lock nut portion 31a is screwed into the screw portion 29, and the distal end cylindrical portion 12 is positioned and fixed with respect to the casing 10 by tightening the lock nut portion 31a.

  An output shaft portion 26 is held by a retaining member 32 in the second tube portion 28 of the distal end tube portion 12, and the second tube portion 28 and the head portion 51 of the torque wrench main body portion 5 are rotatable as described later. The mechanism 90 is rotatably connected.

  The grip portion 11 has a switch lever 35 of the start switch 34 disposed behind the hand force line 33 that indicates a place where the operator grips with a hand. The switch lever 35 is disposed in a cutout portion 36 cut out on the outer peripheral surface of the grip portion 11. The switch lever 35 is pivotally attached to the rear end portion with the pivot pin 37 as a fulcrum, and a first spring portion 38 configured by a coil spring so that the front end portion protrudes outward from the outer peripheral surface of the grip portion 11. It is energized. The switch lever portion 35 is biased in the switch-on and switch-off directions by a second spring portion 39 that forms a toggle spring with two leaf springs.

  In the present embodiment, the start switch 34 is configured by a non-contact type switch circuit in which a Hall IC and a magnet are combined. The magnet 40 is fixed to the inside of the switch lever portion 35, and the Hall IC 41 is gripped at a position facing the magnet 40 with a slight gap while the switch lever portion 35 is pushed in until it comes into contact with a stopper (not shown). It is arranged in the part 11.

  In the present embodiment, when the operator grips the grip portion 11 with his / her hand, the center of the palm is aligned with the hand force line 33, so that the switch lever portion 35 is gripped by the ring finger and the little finger. For this reason, when a force is applied to the hand gripping the grip portion 11, the switch lever portion 35 is naturally pushed in and the switch is turned on. Further, when the hand holding the grip portion 11 is loosened, the switch lever portion 35 is pushed back and the switch is turned off.

  In addition, the screw part formed in the inner peripheral surface of the front-end | tip part of the grip part 11 is screwed into the rear-end screw part formed in the outer peripheral surface of the rear-end part of the casing 10, and the lock | rock engaged with this rear-end screw part By tightening the nut portion 31b, the grip portion 11 can be fixed at an arbitrary rotational position with respect to the casing 10.

  When the switch detection circuit of the circuit unit 80 detects that the switch is turned on, the motor control circuit of the circuit unit 80 starts the rotation of the electric motor 21 and the LED lighting circuit of the circuit unit 80 lights up the operation lamp composed of LEDs. . A circuit board constituting the circuit unit 80 extends rearward from the rear end of the casing 10, for example. The operation lamp is attached to the rear side from the rear end of the circuit board. Four openings are formed on the outer peripheral surface of the grip portion 11 at equal intervals along the circumferential direction. Each opening is formed at a position facing the operation lamp, and a light diffusing plate 42 is attached to each opening, and the light of the operation lamp is guided to the light diffusing plate 42 so that the operation lamp can be viewed from any direction. The operator can check the lighting, blinking, and lighting color. In addition, you may arrange | position the LED operation lamp to each light diffusing plate 42, respectively.

  Next, the configuration of the torque wrench body 5 will be described.

  The torque wrench main body 5 includes a head portion 51, a hollow lever portion 52, a torque value setting portion 53, and a toggle mechanism 54 that is a torque limiter. The head portion 51 has a head rear end portion 51b extending rearward from the main body portion 51a. The head rear end portion 51b is inserted into the lever portion 52 from the front end opening portion of the lever portion 52, and the lever is interposed via the support shaft 51c. The part 52 is rotatably supported by the shaft.

  The torque value setting portion 53 is disposed at the rear portion of the lever portion 52, and when a screw shaft (not shown) is rotated from the rear end side of the lever portion 52, a nut portion (not shown) screwed to the screw shaft is screwed and torque is increased. The spring force of a spring member (not shown) for setting the value is changed. The spring force of the spring member is transmitted to a thruster (not shown) that constitutes a toggle mechanism 54 that can move in the lever portion 52 in the axial direction.

  Further, the rear end of the head rear end 51b and the front end of the thruster face each other with a gap, and a plate-shaped toggle (for example) is provided between the rear end of the head rear end 51b and the front end of the thruster. (Not shown) is arranged. Both end portions of the toggle are rotatably connected to a rear end portion of the head rear end portion 51b and a front end portion of the thruster by a toggle pin (not shown). Further, the toggle is disposed in an inclined state with respect to the axial axis when the axial center of the head rear end 51b coincides with the axial axis of the thruster.

  When a tightening force is applied to the lever portion 52 of the torque wrench main body 5 to tighten the screw, a component force generated in the axial direction through the tilted toggle is applied to the thruster and reaches a set torque value. Then, the thruster moves axially rearward against the spring force of the spring member for setting the torque value, the lever portion 52 rotates with respect to the head portion 51, and the operation of the toggle mechanism 54 is confirmed. The In the present embodiment, a toggle operation detection switch 55 that electrically detects that the toggle mechanism 54 has been operated is provided. The configuration of the toggle operation detection switch 55 will be described later.

  In the torque wrench main body 5 and the electric drive unit 3, the output shaft 26 is engaged with the inner shaft 61 of the head main body 51a, and the rear end portion of the lever portion 52 of the torque wrench main body 5 is integrated with the grip portion 11. Are integrally connected by being fitted to a fitting portion 13 that forms a torque wrench support portion provided on the rim. The fitting portion 13 is formed in a tapered hole shape. The fitting portion 13 is formed to have a larger diameter than the inner diameter of the central portion 13b in the inner diameter axial direction of the both end openings 13a, and the rear end portion of the lever portion 52 is in line contact with the inner diameter surface of the central portion 13b in the circumferential direction. It is fitted and held in a state.

  In the present embodiment, the fitting portion 13 has a tapered hole shape in which the inner diameter gradually increases from the axial central portion 13b toward the front and rear in the axial direction, so the lever portion 52 is centered on the shaft center. The direction can be changed in any direction, and it is movable along the axial direction.

  As shown in FIG. 2, the head part 51 has a first hole part 62 and a second hole part 63 connected to the head body part 51a. An outer shaft portion 64 is rotatably disposed in the first hole portion 62. The outer shaft portion 64 is integrally formed along the axial direction with a cylindrical shaft body portion 65 and an angular shaft portion 66 having a connecting shaft connected to the fastening body. Projecting outward from the other surface side of the head body 51a. For example, a socket (not shown) is engaged with the square shaft portion 66, and a bolt or a nut is engaged with the socket.

  The shaft main body portion 65 of the outer shaft portion 64 has an outer ratchet tooth portion 67 formed on the outer peripheral portion and an inner ratchet tooth portion 69 formed on the inner diameter hole portion 68. An inner shaft 61 is rotatably disposed in the inner diameter hole portion 68.

  A second ratchet pawl 70 is engaged with the outer ratchet teeth 67 by a second push spring 71 in the second hole 63 to constitute a one-way clutch. In FIG. 2B, when the direction indicated by the arrow is the tightening direction and the head main body 51a rotates in the tightening direction, the second ratchet pawl 70 is engaged with the outer ratchet tooth portion 67, and the outer shaft portion 64 and the tightening direction. And tighten the screws. When the head portion 51 rotates in the direction opposite to the tightening direction, the engagement between the second ratchet pawl 70 and the outer ratchet tooth portion 67 is released, and only the head portion 51 rotates.

  On the other hand, two first ratchet claws 72 are arranged on the outer peripheral portion of the inner shaft 61 at a rotationally symmetric position about the axis so as to be tiltable with one end as a fulcrum. It is pushed by 73 and engages with the inner ratchet teeth 69 of the outer shaft part 64. The first push spring 73 is disposed in a shaft hole 74 formed in the radial direction. When the inner shaft 61 rotates in the tightening direction indicated by the arrow, the first ratchet pawl 72 engages with the inner ratchet tooth portion 69 and rotates the outer shaft portion 64 in the tightening direction. When the outer shaft portion 64 rotates in the tightening direction, the second ratchet pawl 70 is disengaged from the outer ratchet tooth portion 67, so that a fastening body such as a bolt can be tightened by power.

  The inner shaft 61 has a single-letter-shaped engagement groove portion 75 formed at one end thereof, and a rectangular shaft end portion 26 a formed at the distal end portion of the output shaft 26 engages with the engagement groove portion 75.

  In the present embodiment, the head main body 51a and the second cylinder 28 are rotatably held by a rotatable mechanism 90 described later.

  Here, in order to temporarily tighten a bolt or the like by the power of the electric drive unit 3, a socket is engaged with the bolt, and the switch lever portion 35 of the start switch 34 is gripped to turn on the switch. The electric motor 21 is driven when the start switch 34 is turned on, and the output shaft 26 is rotated in the tightening direction by the driving force decelerated by the power transmission unit 22.

  When the tightening torque of the fastening body such as a bolt reaches the temporary tightening torque by the electric drive, the motor drive circuit cuts off the energization in the tightening direction to the electric motor 21, stops the motor, and temporarily stops the electric motor 21. Energize in the reverse rotation direction and reverse the motor for a moment. By this reverse rotation, the force remaining in the power transmission system from the electric motor 21 to the output shaft 26 can be released.

  Here, it will be described below that a fastening body such as a temporarily tightened bolt does not loosen even if the electric motor 21 is rotated in the reverse direction.

  First, when the inner shaft 61 rotates in the reverse direction, the first ratchet pawl 72 is disengaged from the inner ratchet tooth portion 69, and only the inner shaft 61 rotates idly, and no reverse rotational force is transmitted to the outer shaft portion 64. .

  If a mechanism such as an automatic transmission is provided in the power transmission system, the clutch of the automatic transmission mechanism is operated by reverse rotation, and high reverse torque is not transmitted.

  Even if a mechanism such as an automatic transmission is not provided, even if the rotation of the inner shaft is transmitted to the outer shaft portion 64 via the first ratchet pawl 72 and the inner ratchet tooth portion 69, the second ratchet pawl 70 is Engaging with the outer ratchet teeth portion 67, the reverse rotation of the outer shaft portion 64 is prevented. If the electric motor 21 is reversely rotated with a weak torque, the electric motor 21 is stalled first and high reverse torque is not transmitted.

  Subsequently, when the operator pulls the grip portion 11 in the tightening direction while holding the switch lever portion 35, a manual pulling force by manual operation is transmitted to the torque wrench main body portion 5 through the fitting portion 13. .

  When a force in the tightening direction is applied to the lever 52 of the torque wrench main body 5, the tightening force is transmitted to the head main body 51a via the support shaft 51c, and the second ratchet pawl 70 and the outer ratchet tooth 67 are engaged. Since the outer shaft portion 64 is rotated in the tightening direction, the fastening body such as a bolt is further tightened from the temporary tightening torque. When the set torque value is reached, the toggle mechanism 54 operates, the head portion 51 and the lever portion 52 are relatively bent with the support shaft 51c as a fulcrum, and the head rear end portion 51b collides with the inside of the lever portion 52. The relative rotation stops. At this time, the lever portion 52 can move in the axial direction with respect to the fitting portion 13 and can change the direction in an arbitrary direction around the axis, so that the lever portion 52 moves forward while smoothly tilting. Further, since the head portion 51 is rotatably held by the second cylinder portion 28 via the rotatable mechanism 90, the head portion 51 rotates smoothly with the support shaft 51c as a fulcrum when the toggle mechanism 54 is operated. At that time, the toggle operation detection switch 55 detects the start of the toggle operation and outputs to the toggle detection circuit of the circuit unit 80 that the set torque value has been reached.

  In this way, the torque wrench main body 5 is in a state where the torque wrench main body 5 can be freely operated by the rotatable mechanism 90, and substantially the same state as the situation where the torque wrench main body 5 is operated as a single unit can be obtained.

  That is, even if the torque wrench body 5 is rotatable by the rotatable mechanism 90, a friction torque is generated. This friction torque (Tf) is obtained by the following formula 1. T is the tightening torque, L is the effective length, L1 is the distance between the connection point between the electric motor 21 and the torque wrench body 5 from the hand force point 33, and L2 is the distance between the electric motor 21 and the torque wrench body 5 from the center of the fastening body. A distance between the connection points, R is a radius around the axis X of the connection point between the torque wrench main body 5 and the fitting portion 13, and μ is a friction coefficient.

Tf = (T / L) × (L1 / L2) × R × μ (1)
Here, the friction torque Tf is extremely small as compared with the tightening torque T and can be ignored. When the torque wrench body 5 is actuated to tilt the head 5 by a small angle α (the head 5 rotates in the direction opposite to the tightening direction), the electric motor 21 is rotated through the bevel gears 23 and 24. Torque is generated. However, the rotation angle caused by the inclination of the angle α is infinitely smaller than the backlash angle (β) of the transmission mechanism inside the electric motor 21.

  For this reason, if the electric motor 21 rotates in the reverse direction after the temporary tightening and the backlash occurs in the transmission mechanism, it is not necessary to add the torque for turning the electric motor 21 when the torque wrench body 5 is operated. .

  The toggle operation detection switch 55 is configured by a non-contact type switch circuit in which a Hall IC and a magnet are combined. In the present embodiment, a support pin 55a penetrating a partially cutout portion 52a provided in the lever portion 52 is provided at the head rear end portion 51b of the head portion 5, and a magnet 55b is provided at the tip of the support pin 55a. In addition, a Hall IC 55c that is turned on when the magnet 55b approaches the outer periphery of the casing 10 and turned off when the magnet 55b leaves is provided. In a state where the toggle mechanism 54 is not operated, the Hall IC 55c is arranged at a position away from the magnet 55b, and the toggle mechanism 54 is operated to rotate the head unit 5 with respect to the casing 10 to the stop position using the support shaft 51c as a fulcrum. When it does, it arrange | positions in the position close | similar to the magnet 55b. In the present embodiment, whether or not the torque wrench main body 5 has been operated is determined by detecting the movement of the head of the toggle mechanism 54, but can be determined by detecting the movement of the thruster and the like. Then, when an ON signal is output from the Hall IC 55, the circuit unit 80 lights, for example, an LED in blue to indicate completion of tightening.

  A configuration of the rotatable mechanism 90 that rotatably holds the head main body 51a and the second cylinder 28 will be described with reference to FIG.

  The rotatable mechanism 90 includes, for example, two engagement protrusions 91 provided at symmetrical positions around the axis X expended from the other end surface side of the head main body 51a, and a nut 92 with a retaining collar. In the nut 92 with a retaining collar, a retaining collar 92b is formed at one end of the nut main body 92a, and two engaging protrusions 91 are inserted in advance. The engaging projection 91 is prevented from coming off the engaging projection 91 because the outward engaging claw 91 a formed at the tip is engaged with the retaining collar 92 b.

  In the present embodiment, the nut 92 with a retaining collar is disposed on the head main body 51 a of the head 51 via two engaging protrusions 91. On the other hand, a threaded portion into which the nut main body 92a of the nut 92 with a retaining collar is screwed is formed on the outer peripheral portion of the distal end of the second cylindrical portion 28. The shaft end portion 26 a of the output shaft 26 is engaged with the engagement groove portion 75 of the inner shaft 61, and the nut main body 92 a of the nut 92 with a retaining collar is screwed into one end outer peripheral portion of the second cylindrical portion 28. At this time, the tightening of the nut 92 with the retaining collar is finished to such an extent that the engagement claw 91a and the retaining collar 92b of the engagement projection 91 are not tightened. In addition, the nut 92 with a flange can be prevented from being loosened by a loosening prevention means.

  The semi-automatic torque wrench 1 of the present embodiment is provided with a hanging ring portion 2 in a casing 10, and the lower end of a hanging wire of a hanging reel disposed in a factory, for example, is attached to the hanging ring portion 2. The torque wrench main body can be turned on by simply turning on the start switch 34 by simply grasping the grip 11 provided at the rear end of the electric drive section 3 extending in a straight line, and after temporarily tightening, pulling the grip 11 forward. Since the final tightening by the portion 5 can be performed with a predetermined torque value, operability is good.

  Moreover, although the battery 7 is mounted on the rear end of the electric drive unit 3, the whole is well balanced, so that the operator can perform work with less fatigue.

Second Embodiment FIGS. 3A and 3B are views showing a second embodiment of the semi-automatic torque wrench according to the present invention, in which FIG. 3A is a front view and FIG.

  The semi-automatic torque wrench 100 of the present embodiment has the same configuration as the semi-automatic torque wrench 1 of the first embodiment shown in FIG. 1 except that the electric motor 21 is driven by feeding from a commercial power source. The same members are denoted by the same reference numerals, and the description thereof is omitted. An example in which LED operation lamps are arranged at four light diffusion plates 42 will be described.

  In the present embodiment, the circuit unit 80 disposed in the electric drive unit 3 is provided with a motor control circuit, a switch detection circuit, and an LED lighting circuit. The power supply line 101 for driving the circuit unit 80 requires a total of four lines, two for the high voltage power source for the motor control circuit and two for the low voltage power source for the switch detection circuit and the LED lighting circuit. When the circuit unit 80 is arranged in an external control box or the like, the motor control circuit using an inverter of a brushless motor that is the electric motor 21 has three motor wires for supplying power to the three phases and three in three phases. Three Hall element IC lines for one Hall element IC, two lines for the start switch 34, and two lines for the toggle operation detection switch 55 are required, for a total of 16 lines.

  That is, in the present embodiment, by incorporating the circuit unit 80 in the power supply driving unit 3, it is possible to significantly reduce the number of cable wires as compared with the case where a circuit unit is provided outside. For this reason, the outer diameter of the cable can be reduced, and the connector can be miniaturized. Further, since the outer diameter of the cable is reduced, the weight of the cable and the workability of tightening are improved.

  In the first and second embodiments described above, a torque sensor such as a strain gauge that can detect the tightening torque value can be incorporated. Thus, by providing the torque sensor, the measured torque data can be output by wire or wirelessly, and it is possible to construct an advanced management system for tightening data.

  In each embodiment described above, an electric motor is used as a drive source, but an air motor or a hydraulic motor may be used as a drive source.

DESCRIPTION OF SYMBOLS 1,100 Semiautomatic torque wrench 3 Electric drive part 5 Torque wrench main body part 7 Battery 10 Casing 11 Grip part 12 Tip cylinder part 13 Fitting part 13a Opening part 13b Central part 21 Electric motor 22 Power transmission part 23, 24 Bevel gear 25 Input shaft portion 26 Output shaft portion 26a Shaft end portion 27 First tube portion 28 Second tube portion 31a, 31b Lock nut portion 33 Force line 34 Start switch 35 Switch lever 37 Pivot pin 40, 55b Magnet 41, 55c Hall IC
42 Light diffusing plate 51 Head portion 51a Main body portion 51b Rear end portion 51c Support shaft 52 Lever portion 53 Torque value setting portion 54 Toggle mechanism 55 Toggle operation detection switch 61 Inner shaft 64 Outer shaft portion 65 Shaft body portion 66 Angular shaft portion 67 Outer ratchet tooth portion 68 Inner diameter hole portion 69 Inner ratchet tooth portion 70 Second ratchet pawl 71 Second push spring 72 First ratchet pawl 73 First push spring 74 Shaft hole portion 80 Circuit portion 90 Rotating mechanism

Claims (12)

A power source having a drive source and a power transmission unit disposed in a linear cylindrical part, having an output shaft of the power transmission part at a tip part of the cylindrical part, and having a tail end part of the cylindrical part as a grip part; ,
A head portion and a lever portion, wherein the head portion uses a tightening force from the output shaft as a first input portion, and a tightening force from the lever portion as a second input portion to apply a tightening force to the fastening body, A torque wrench main body for operating a torque limiter when the fastening body is tightened at a predetermined torque value by a tightening force from a lever portion;
A torque wrench support that holds the tail end of the torque wrench body and transmits a tightening force by hand to the lever through the cylinder;
A semi-automatic torque wrench characterized by comprising   The start lever part of the start switch of the drive source is arranged on the tail end side of the hand force line provided on the outer periphery of the grip part, and the start lever part is pushed inward from the outer peripheral surface of the grip part. The semi-automatic torque wrench according to claim 1, wherein the torque wrench is structured.   The semi-automatic torque wrench according to claim 2, wherein the start switch is a non-contact type.   The semi-automatic torque wrench according to any one of claims 1 to 3, wherein the power drive unit includes a non-contact detection switch that electrically detects the operation of the torque limiter.   The said power drive part has a brushless motor as a drive source, The circuit part of the electric equipment arrange | positioned at the said power drive part was arrange | positioned in the said cylinder part, The Claim 1 characterized by the above-mentioned. Semi-automatic torque wrench.   The semi-automatic torque wrench according to claim 5, further comprising an LED lamp that informs an operating state as the electric device.   The semi-automatic torque wrench according to claim 5 or 6, wherein a power line fed from an external power source and a communication line communicating with the outside are connected to the circuit unit arranged in the power drive unit.   The semi-automatic torque wrench according to claim 5 or 6, wherein a battery is detachably attached to a tail end portion of the cylindrical portion. The torque wrench main body is configured such that the head portion and the lever portion are coupled to each other via a support shaft so as to be relatively rotatable, and the head portion and the lever portion are relatively rotated by the operation of the torque limiter,
Holding means for rotatably holding the head part at the tip of the cylinder part;
9. The torque wrench support portion supports the tail end portion of the lever portion so as to be movable in the axial direction of the lever portion with respect to the cylindrical portion and tiltable about an axis. A semi-automatic torque wrench according to any one of the above.   The torque wrench support portion is formed in a tapered hole shape having a larger inner diameter of the opening portion in the axial direction than the inner diameter of the axial central portion, and the rear end portion of the lever portion is formed in the axial central portion. The semi-automatic torque wrench according to claim 9, wherein the semi-automatic torque wrench is supported in a line contact state.   The first input portion includes an inner shaft that engages with the output shaft, an outer shaft portion that includes the inner shaft coaxially and includes a connecting shaft that is coupled to the fastening body, and a tightening direction of the output shaft. And a first one-way clutch means for transmitting the rotation of the motor to the outer shaft portion via the inner shaft, and the second input portion from the lever portion to the head body portion. The semi-automatic torque wrench according to any one of claims 1 to 10, characterized by comprising a second one-way clutch means for transmitting the tightening force transmitted to the outer shaft portion.   The semi-automatic torque wrench according to any one of claims 1 to 11, wherein the power drive unit and the torque wrench main body are arranged so as to overlap each other.