JP2011183479A - Bolt fastening machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bolt fastening machine for reducing the size, by reducing maintenance work. <P>SOLUTION: A shear wrench 1 includes a motor housing 2B, a brushless motor 3 stored in the motor housing 2B and having an output shaft 31A extending in one direction, a gear case 2C connected to the motor housing 2B, an inner socket 61 rotatingly driven by the brushless motor 3 around a rotary shaft in the orthogonal direction to the one direction, an outer socket 63 rotatingly driven in the inverse direction of the inner socket 61 by the brushless motor 3 around the rotary shaft, a rotational driving transmission part 4 stored in the gear case 2C and transmitting the rotational driving of the brushless motor 3 to the inner socket 61 and the outer socket 63 and a handle part 2A extending in parallel to the one direction from the gear case 2C. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a bolt fastening machine, and more particularly, to a bolt fastening machine for fastening a high tension bolt.

  2. Description of the Related Art Conventionally, in construction of bridges, steel buildings, etc., there is a construction method by friction joining using high tension bolts as a method for joining structural materials. As a tool for fastening the high tension bolt, a bolt fastening machine described in Patent Document 1 is exemplified.

  In the conventional shear wrench 101 shown in FIG. 5, the commutator motor 103 in the motor housing 102B rotates when the power cord 125 is connected to a power source (not shown) and the trigger 121A is pressed. This rotational force is transmitted to the inner socket 161 and the outer socket 163 by the rotational drive transmission mechanism 104, engages with a tip and a nut of a high tension bolt (not shown), and reversely rotates with each other to thereby rotate a high tension bolt (not shown). Conclude.

JP 2004-001233 A

  The shear wrench 101 described above uses a commutator motor 103 as a motor. For this reason, it has been necessary to replace the brush every time the brush in the commutator motor 103 is worn due to long-term use. Moreover, since it is often used in work at high places as described above, there is a need for downsizing the shear wrench 101.

  Therefore, an object of the present invention is to provide a bolt fastening machine that reduces maintenance work and has a reduced size.

  In order to solve the above problems, the present invention intersects a motor housing, a brushless motor having an output shaft housed in the motor housing and extending in one direction, a gear case connected to the motor housing, and the one direction. An inner socket that is driven to rotate by the brushless motor about a rotating shaft extending in the direction, an outer socket that is driven to rotate in a direction opposite to the inner socket by the brushless motor about the rotating shaft, and a gear case A bolt tightening comprising: a rotational drive transmitting portion that is housed and transmits rotational drive of the brushless motor to the inner socket and the outer socket; and a handle portion extending in a direction from the gear case toward the one direction. Provide an attached machine.

  According to the bolt tightening machine having such a configuration, by using a brushless motor as the motor, it is not necessary to replace the brush of the motor, so that the maintenance work load can be reduced. Furthermore, since the brushless motor is more efficient and smaller than the conventional commutator motor, the size of the bolt fastening machine can be reduced.

  The bolt tightening machine configured as described above further includes a circuit board provided with a switching element for controlling energization to the brushless motor, the brushless motor including a coil positioned radially outward of the output shaft, A permanent magnet provided coaxially with the output shaft and facing the coil; the switching element controls energization to the coil; and the inner socket and the outer socket are positioned on the output shaft side of the brushless motor. The circuit board is preferably located on the side opposite to the output shaft side across the brushless motor.

  According to the bolt tightening machine having such a configuration, a brushless motor can be used as the motor while maintaining the conventional structure. Furthermore, since the circuit board is located in the vicinity of the brushless motor, wiring between them can be easily performed.

  Furthermore, it is preferable that the handle portion is formed by a split handle housing, and the circuit board is sandwiched by the split handle housing.

  According to the bolt tightening machine having such a configuration, the circuit board can be pinched with a small number of parts with high accuracy by holding the circuit board with the split handle housing.

  Furthermore, it is preferable that the split handle housing and the motor housing are integrally formed.

  According to the bolt tightening machine having such a configuration, the number of parts can be reduced by integrating the split handle housing and the motor housing. Furthermore, the number of assembly steps can be reduced.

  Further, it is preferable that one end of the handle portion is connected to the gear case, and a power cord is connected to the other end, and the power cord is connected to the circuit board in the split handle housing.

  According to the bolt tightening machine having such a configuration, the circuit board is located in the vicinity of the power cord, and the wiring length in the split handle housing can be minimized.

  Further, the switching element is provided on the brushless motor side of the circuit board, and a vent hole is formed in a side surface portion of the split handle housing in the vicinity of the split handle housing in which the switching element is accommodated. Is preferably formed.

  According to the bolt tightening machine having such a configuration, since the ventilation hole is formed in the vicinity where the switching element is provided, the switching element on the circuit board can be efficiently cooled.

  The present invention also includes a housing, a brushless motor having an output shaft housed in the housing and extending in one direction, an output portion driven by the brushless motor and extending in a direction perpendicular to the one direction, and the housing. It has a gear case to be connected, a driving force transmission portion that is housed in the gear case and transmits the driving force of the brushless motor to the output portion, and a handle portion that extends from the gear case in parallel with the one direction. An electric tool is further provided.

  Further, the present invention is connected to the brushless motor having a rotating shaft extending vertically, a housing that houses the brushless motor, an output portion that extends in the front-rear direction and that transmits the driving force of the brushless motor, and the housing. And a handle portion extending in the up-down direction.

  According to the electric tool having such a configuration, by using a brushless motor as the motor, it is not necessary to replace the brush of the motor, so that the maintenance work burden can be reduced. Furthermore, since the brushless motor is more efficient and smaller than the conventional commutator motor, the size of the electric tool can be reduced.

  Further, a brushless motor is disposed below the output unit, a circuit board provided with a switching element is disposed below the brushless motor, and a power cord protrudes from below the handle unit. Is preferred.

  According to the bolt fastening machine of the present invention, it is possible to provide a bolt fastening machine with reduced maintenance work and reduced size.

Sectional drawing of the bolt fastening machine which concerns on the 1st Embodiment of this invention. FIG. 3 is a partial cross-sectional view in the vicinity of a socket portion that is a bolt fastening machine according to the first embodiment of the present invention and is fitted with a high-tensile bolt. FIG. 3 is a partial cross-sectional view of the vicinity of a socket portion in a state where a high tension bolt is tightened in the bolt tightening machine according to the embodiment of the present invention. Sectional drawing of the bolt fastening machine which concerns on the 2nd Embodiment of this invention. Sectional drawing of the bolt fastening machine which concerns on a prior art example.

  A power tool according to a first embodiment of the present invention will be described with reference to FIGS. Hereinafter, an example of the electric tool will be described based on a bolt fastening machine. A shear wrench 1 serving as a bolt tightening machine includes a housing 2, a brushless motor 3, a rotational drive transmission mechanism 4, a bolt chip discharge mechanism 5, and a socket portion 6.

  The housing 2 forms an outline of the shear wrench 1 and mainly includes a handle portion 2A, a motor housing 2B (shaded portion in FIG. 1), and a gear case 2C. The handle portion 2A is configured to extend from the gear case 2C in a direction substantially orthogonal to the longitudinal direction of the gear case 2C (the direction in which a rod 51 described later moves and the rotational axis of the inner socket 61 and outer socket 63 described later). Has been. Hereinafter, the direction in which the handle portion 2A extends from the gear case 2C is defined as a downward direction, and the opposite side is defined as an upward direction. The longitudinal direction of the gear case 2C and the direction in which the socket portion 6 is provided with respect to the gear case 2C is defined as the front direction, and the opposite side is defined as the rear direction. The vertical direction and the direction orthogonal to the front-rear direction (direction orthogonal to the paper surface of FIG. 1) are defined as the left-right direction.

  The handle portion 2A is constituted by a split housing that is divided into two from the center in the left-right direction. The handle portion 2A has a substantially L-shaped cross section and is provided so as to extend downward from the gear case 2C. A switch mechanism 21 for switching the power supply of the brushless motor 3 and a first circuit board 22 for controlling the brushless motor 3 are provided inside the handle portion 2A. A power cord 25 connected to an external power source (not shown) is connected to the switch mechanism 21, and a trigger 21 </ b> A that can be pulled while the operator holds the handle portion 2 </ b> A is provided. The first circuit board 22 is supported by a plurality of ribs (not shown) provided inside the handle portion 2A. The first circuit board 22 is connected to a power cord 25, and a plurality of switching elements 22A and a microcomputer 22B are provided on the brushless motor 3 side (upper surface). The first circuit board 22 is electrically connected to a second circuit board 33, which will be described later, via two cables 22C and a connector 22D. In addition, vent holes 2a are formed in the rear side and the left and right side surfaces of the handle portion 2A near the switching element 22A. The switching element 22A and the microcomputer 22B are cooled by the air taken in from the vent hole 2a.

  A lever 23 for operating the bolt tip discharge mechanism 5 is provided at the base portion of the handle portion 2A from the gear case 2C. The lever 23 is configured to rotate upward when pulled by an operator.

  The motor housing 2B is configured by a cylindrical resin member extending in the vertical direction. This cylindrical member has a hole formed in the upper part, and the brushless motor 3 can be inserted from above. The motor housing 2B is provided to extend downward from the gear case 2C at a front side position of the handle portion 2A, and a brushless motor 3 is incorporated therein. The motor housing 2B is formed of a split housing that is divided into two from the center in the left-right direction, like the handle portion 2A. However, the motor housing 2B and the handle portion 2A are separate bodies, and the lower end portion of the motor housing 2B is connected to the handle portion 2A. The brushless motor 3 is mainly composed of a rotary shaft 31 that extends in the vertical direction, a cooling fan 32, a rotor 35, and a stator 36. The rotor 35 is coaxially fixed to the rotating shaft 31 and is composed of a plurality of permanent magnets. An output shaft 31A extending upward is provided at the tip of the rotating shaft 31, and a pinion gear 31B is formed on the output shaft 31A. The stator 36 is provided at a position facing the rotor 35 in the brushless motor 3 and includes a plurality of coils. The rotating shaft 31 is rotatably supported by the motor bearing 34. The lower motor bearing 34 is supported by the motor housing 2B. A through hole 2b is formed in the lower surface of the motor housing 2b, and the cable 22C passes through the through hole 2b. The cooling fan 32 is coaxially fixed on the rotating shaft 31. An exhaust hole 2c is formed in the vicinity of the cooling fan 32 of the motor housing 2B. When the cooling fan 32 rotates, the air sucked from the vent hole 2a cools the switching element 22A and the microcomputer 22B, passes through the through hole 2b, cools the inside of the brushless motor 3, and is exhausted from the exhaust hole 2c. .

  A second circuit board 33 is provided between the brushless motor 3 and the lower surface of the motor housing 2B. On the second circuit board 33, a Hall element 33A is provided. The position of the rotor 35 is detected by the hall element 33A, and the rotation of the rotor 35 is controlled by the microcomputer 22B and the switching element 22A.

  The gear case 2C includes a rotation drive transmission mechanism 4, a bolt chip discharge mechanism 5, and the like. The rotational drive transmission mechanism 4 includes a gear mechanism 7 and a planetary gear mechanism 8. A rod cover 24 is fixedly disposed at the rear end position in the gear case 2C. In the rod cover 24, an insertion hole 24a into which a rear end portion of a rod 51 described later is inserted is formed with the drilling direction as the front-rear direction. The insertion hole 24a is formed so that its inner diameter is slightly larger than the outer diameter of the rod 51 described later.

  The gear mechanism 7 is interposed between the planetary gear mechanism 8 and the brushless motor 3, and includes a first gear 71 that meshes with the pinion gear 31B, a second gear portion 72 that meshes with the first gear 71, and a second gear. It is mainly composed of a third gear portion 73 that meshes with the portion 72. The first gear 71 is a flat gear, and is rotatably supported on the housing 2 via a bearing with a rotation shaft parallel to the rotation shaft of the rotation shaft 31. The second gear portion 72 is a flat gear, and has a second gear 72A that meshes with the first gear 71 and a first bevel gear 72B that rotates coaxially with the second gear 72A. The rotation shaft of the second gear portion 72 is parallel to the first gear 71 and is rotatably supported by the housing 2 via a bearing. Further, the second gear portion 72 has a hole through which a later-described plate rod 55 is inserted vertically. The third gear portion 73 is a bevel gear and is engaged with the first bevel gear 72B, the second bevel gear 73A, and the second bevel gear 73A and the second bevel gear 73A. And a first sun gear 73B located on the front side. The rotation shaft of the third gear portion 73 extends in the front-rear direction perpendicular to the second gear portion 72, and is rotatably supported in front of the rod cover 24 via a bearing. The third gear portion 73 is formed with a through hole at the center of the rotation axis that opens at the front end of the first sun gear 73B and opens at a position where the rear end faces the insertion hole 24a.

  The planetary gear mechanism 8 includes a first planetary gear 81, a second planetary gear 82, a third planetary gear 83, and an outer peripheral portion 8A that is a ring gear of the first to third planetary gears 81 to 83 (shaded portion in FIG. 1). It consists of and. The first planetary gear 81 is disposed in front of the third gear portion 73, revolves with the first sun gear 73B as a sun gear and the outer peripheral portion 8A as a ring gear, and decelerates the rotation of the first sun gear 73B and outputs it. A second sun gear 81A. The second planetary gear 82 is disposed in front of the first planetary gear 81, revolves with the second sun gear 81A as a sun gear and the outer peripheral portion 8A as a ring gear, and decelerates and outputs the rotation of the second sun gear 81A. A third sun gear 82A. The third planetary gear 83 is disposed in front of the second planetary gear 82 and revolves with the third sun gear 82A as a sun gear and the outer peripheral portion 8A as a ring gear. The rotation of the third sun gear 82A is reduced and output. Output part 83A.

  The output portion 83A is open at the front end, and has a socket accommodating space 83a in which an inner socket 61 described later can be accommodated and a weight 52 described later is accommodated. On the inner periphery of the socket housing space 83a, a spline receiving portion 83B configured by a groove and a convex portion extending in the front-rear direction is provided. In the inner periphery, a series of recesses 83b are formed in the front end portion in the circumferential direction. The recess 83b is formed such that the inner diameter of the socket housing space 83a at the bottom surface of the recess 83b is larger than the inner diameter of the socket housing space 83a at the inner surface of the spline receiving portion 83B. The first to third planetary gears 81 to 83 are formed with through holes whose front ends open into the socket housing space 83a and whose rear ends open to the front end of the first sun gear 73B. The three gear portions 73 communicate with the through holes.

  The outer peripheral portion 8A has gears that mesh with the first to third planetary gears 81 to 83, is attached to the first to third planetary gears 81 to 83, and is connected to the third planetary gear 83 via a bearing. It is supported. Therefore, the outer peripheral portion 8A can rotate with respect to the housing 2 and cannot move back and forth.

  The bolt tip discharge mechanism 5 mainly includes a rod 51, a weight 52, a weight biasing spring 53 that biases the weight 52 forward, a spring 54, a plate rod 55, and a plate 56. The rod 51 has a rod shape whose outer diameter is substantially smaller than that of the insertion hole 24 a, and the tip is fixed to the rear end of the weight 52. A recess 51 a is formed on the rear end side of the rod 51, and a rear end including the recess 51 a is a through hole formed in the first to third planetary gears 51 to 53 from the socket accommodating space 83 a and the third gear portion 43. Is disposed in the insertion hole 24a, penetrating through the through-hole formed in the insertion hole 24a. The weight 52 includes a seat portion 52A that receives the weight biasing spring 53, and a biasing portion 52B that is positioned at the front end of the seat portion 52A and that becomes the tip of the rod portion and can protrude into a chip holding space 61a described later. It is arranged in the socket accommodating space 83a. The weight urging spring 53 is disposed in the socket accommodating space 83a, and the front end contacts the seat 52A and the rear end contacts the rear end surface of the socket accommodating space 83a to urge the weight 52 forward. .

  The spring 54 located behind the gear case 2C is supported by the rod cover 24. The plate rod 55 is formed in a rod shape, and is disposed in the hole formed in the second gear portion 72 with the longitudinal direction being the vertical direction. The upper end can be in contact with one end of a plate 56 described later, and the lower end Is disposed at a position where it can come into contact with the lever 23.

  The plate 56 is provided between the spring 54 and the plate rod 55 and is urged downward by the spring 54. A through hole 56a slightly larger than the insertion hole 24a is formed in the plate 56, and the rod 51 can be inserted therethrough. In the state shown in FIG. 1 (the lever 23 is not rotated), the center of the through hole 56a is off the center of the insertion hole 24a, and a part of the plate 56 closes a part of the insertion hole 24a. In this state, the lever 23 is pulled and rotated upward, whereby the plate rod 55 is pushed by the lever 23 and moves upward, and the plate 56 moves upward against the spring 54. As the plate 56 moves upward, the center of the through hole 56a coincides with the center of the insertion hole 24a.

  The socket portion 6 mainly includes an inner socket 61, a socket biasing spring 62, and an outer socket 63 (shaded portion in FIG. 1). The inner socket 61 includes a spline portion 61A, a chip urging portion 61B, and a pressing ball 61C, and is configured to be accommodated in the socket accommodating space 83a. A chip holding space 61 a is formed in front of the inner socket 61. A step portion that comes into contact with an inner socket restricting member 63A described later is provided at a substantially central position in the front-rear direction on the outer peripheral surface of the inner socket 61.

  As shown in FIG. 2, the tip holding space 61a is configured to open at the front end of the inner socket 61 to receive and hold the bolt tip 11A (bolt tip) of the high tension bolt 11, and the bolt tip 11A on the inner peripheral surface. A spline groove that fits with the spline shape is formed. Therefore, the inner socket 61 and the bolt tip 11A can rotate together. In the inner socket 61, an opening 61b through which the urging portion 52B of the weight 52 penetrates and protrudes into the chip holding space 61a is formed at the bottom surface of the chip holding space 61a. In the inner socket 61, a seat portion receiving space 61c capable of receiving the seat portion 52A of the weight 52 is formed behind the opening 61b.

  61 A of spline parts are provided in the rear-end side of the outer periphery of the inner socket 61, and it is comprised so that engagement with the spline receiving part 83B in the socket accommodation space 83a is possible. When the spline portion 61A and the spline receiving portion 83B are engaged, the inner socket 61 can move back and forth with respect to the output portion 83A and cannot rotate, and the inner socket 61 rotates integrally with the output portion 83A.

  The chip urging portion 61B is composed of a ball disposed in a hole opened in the inner peripheral surface of the chip holding space 61a of the inner socket 61 and a spring that urges the ball. When the ball is biased by a spring and protrudes into the chip holding space 61a, the bolt chip 11A can be held in contact with the bolt chip 11A housed in the chip holding space 61a.

  The holding ball 61C is movably disposed in a hole penetrating the outer peripheral surface of the inner socket 61 and the inner peripheral surface of the seat accommodating space 61c. By disposing in this hole, the pressing ball 61C contacts the outer periphery of the seat 52A and protrudes from the outer peripheral surface of the inner socket 61 in a state where the seat 52A is received in the seat receiving space 61c. ing. Therefore, when the seat 52A is positioned in the seat accommodating space 61c with the inner socket 61 positioned in front of the output portion 83A, a part of the holding ball 61C protrudes from the outer peripheral surface of the inner socket 61 and is inserted into the recess 83b. Is done. Even if the inner socket 61 is tried to be inserted into the socket housing space 83a in this state, the rearward movement of the inner socket 61 is restricted because a part of the holding ball 61C inserted into the recess 83b is caught by the spline receiving portion 83B. The By retracting the seat 52A from the seat accommodating space 61c, the holding ball 61C can protrude into the seat accommodating space 61c and can be retracted from the recess 83b, so that the inner socket 61 can be moved rearward. Become.

  The socket urging spring 62 is accommodated in the socket accommodating space 83a in a state where the weight 52 and the weight urging spring 53 are accommodated therein. The socket biasing spring 62 is configured such that the front end abuts on the inner socket 61 and the rear end abuts on the rear end surface of the socket accommodating space 83a. The inner socket 61 is biased forward by the socket biasing spring 62.

  The outer socket 63 is attached to the front end portion of the outer peripheral portion 8A, rotates integrally with the outer peripheral portion 8A, forms a nut holding space 63a, and includes an inner socket restricting member 63A. The nut holding space 63a is configured to open at the front end of the outer socket 63 and engage with the nut 12 (FIG. 2). Therefore, the outer socket 63 and the nut 12 can rotate together. The inner socket restricting member 63A is defined at the position of the rear end surface of the nut holding space 63a, and has an opening 63b through which only the front end portion of the inner socket 61 can be inserted. In a state where the front end portion of the inner socket 61 passes through the opening 63b, the stepped portion of the inner socket 61 contacts the inner socket restricting member 63A. Therefore, the inner socket 61 is attached to the socket biasing spring 62 by the inner socket restricting member 63A. This prevents the nut from falling into the nut holding space 63a.

  When the high tension bolt 11 and the nut 12 (FIG. 2) are not inserted into the chip holding space 61a and the nut holding space 63a, the inner socket 61 is moved forward by the socket biasing spring 62 as shown in FIG. The front end portion of the inner socket 61 protrudes into the nut holding space 63a. Further, the weight 52 and the rod 51 are urged forward by the weight urging spring 53 so that the seat 52A is accommodated in the seat accommodating space 61c and the urging portion 52B protrudes into the chip holding space 61a. Adopted. In this state, a part of the pressing ball 61C is inserted into the recess 83b and hooked on the spline receiving portion 83B, so that the inner socket 61 is prevented from moving backward.

  Next, the operation of tightening the high tension bolt 11 of the shear wrench 1 will be described. As shown in FIG. 2, with the high tension bolt 11 and the nut 12 temporarily fixed to the steel sheet S, the bolt tip 11A is inserted into the tip holding space 61a and the nut 12 is inserted into the nut holding space 63a. . By accommodating the bolt tip 11 </ b> A in the tip holding space 61 a, the bolt tip 11 </ b> A comes into contact with the urging portion 52 </ b> B, and the rod 51 and the weight 52 are moved backward with respect to the inner socket 61. As the weight 52 moves rearward, the seat 52A moves out of the seat accommodating space 61c, so that the inner socket 61 can move rearward with respect to the outer socket 63. Therefore, when the nut 12 is inserted into the nut holding space 63 a, the nut 12 comes into contact with the inner socket 61, and the inner socket 61, the weight 52, and the rod 51 move backward with respect to the outer socket 63. Along with this movement, the recess 51a located at the rear end portion of the rod 51 is caught in the through hole 56a of the plate 56, and the forward movement of the weight 52 and the rod 51 is restricted.

  In this state, the trigger 21A is pulled to drive the brushless motor 3 to rotate the inner socket 61 relative to the outer socket 63, tighten the nut 12 to the high tension bolt 11, and further drive the brushless motor 3. As shown in FIG. 3, the bolt tip 11 </ b> A is sheared so as to be threaded from the high tension bolt 11. By this shearing, the nut 12 can be fastened to the high tension bolt 11 with a predetermined torque.

  When the shear wrench 1 is removed from the high tension bolt 11 after the nut 12 is fastened to the high tension bolt 11, the inner socket 61 is biased forward by the socket biasing spring 62, but the weight 52 is the recess of the rod 51. Since the forward movement is restricted by 51a being caught in the through-hole 56a, it stops at the same position as the position where the nut 12 is tightened. Therefore, as shown in FIG. 3, a gap is generated between the inner socket 61 and the weight 52. Moreover, since the bolt tip 11A accommodated in the tip holding space 61a is biased by the tip biasing portion 61B, the bolt tip 11A is prevented from falling out of the tip holding space 61a.

  In this state, the lever 23 is pulled and the plate 56 is moved upward against the urging force of the spring 54, so that the catch between the through hole 56a and the recess 56a is released. The weight 52 momentarily advances by the biasing force of the weight biasing spring 53, the biasing portion 52B contacts the bolt tip 11A in the tip holding space 61a, and the bolt tip 11A is knocked out from the tip holding space 61a. Can be prepared for tightening.

  According to the shear wrench 1 described above, by using the brushless motor 3 as the motor, it is not necessary to replace the brush of the motor, so the maintenance work burden can be reduced. Furthermore, since the brushless motor 3 is more efficient and smaller than the conventional commutator motor 103, the size of the shear wrench 1 can be reduced. That is, in the conventional shear wrench 101 (FIG. 5), the motor housing 2B of the present invention has a shorter vertical height (stacked thickness) than the motor housing 102B. Even if the first circuit board 22 and the second circuit board 33 necessary for the brushless motor 3 are incorporated in the space of this difference, the height (stack thickness) in the vertical direction is shortened compared to the conventional shear wrench 101. Can do.

  Furthermore, according to the shear wrench 1 described above, since the first circuit board 22 is located in the vicinity of the brushless motor 3, wiring between them can be easily performed.

  Furthermore, according to the shear wrench 1 described above, the handle portion 2A is formed of a split housing, and the first circuit board 22 is held by the split housing, so that the first circuit board 22 can be pinched with a small number of parts with high accuracy. can do.

  Further, according to the shear wrench 1 described above, the first circuit board 22 is positioned in the vicinity of the power cord 25, and the wiring length in the handle portion 2A can be minimized.

  Furthermore, according to the shear wrench 1 described above, since the air hole 2a is formed in the vicinity where the switching element 22A is provided, the switching element 22A on the first circuit board 22 can be efficiently cooled. .

  Next, a second embodiment of the present invention will be described with reference to FIG. The same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  A shear wrench 201 according to the second embodiment includes a housing 202, a brushless motor 3, a rotational drive transmission mechanism 4, a bolt tip discharge mechanism 5, and a socket portion 6.

  The housing 202 forms an outline of the shear wrench 201 and mainly includes a handle portion 202A, a motor housing 202B, and a gear case 2C. The handle portion 202A and the motor housing 202B are integrally configured by a split housing that is divided into two at the center in the left-right direction (shaded portion in FIG. 5).

  According to the shear wrench 1 having such a configuration, the handle portion 202 </ b> A and the motor housing 202 </ b> B are formed as an integral two-part housing, so that the number of parts of the shear wrench 201 can be reduced. Furthermore, the number of man-hours for assembling the shear wrench 201 can be reduced.

  The shear wrench according to the present invention is not limited to the embodiment described above, and various modifications are possible within the scope of the gist of the invention described in the claims.

  For example, a cooling metal plate may be provided on the switching element 22 </ b> A disposed on the first circuit board 22. Thereby, the switching element 22A can be cooled more efficiently.

  In the present invention, the brushless motor 3 is used for the shear wrench 1, 201, but the output portion extends in the front-rear direction like an electric tool other than the shear wrench, such as a hammer drill or a hammer, and the motor is oriented in a direction intersecting with the output portion. You may apply to an electric tool with which a rotating shaft extends. In the case of a hammer or hammer drill, the planetary gear mechanism 8 becomes a cylinder and a piston. A drill bit (tip tool) is detachably fixed to the tip of the cylinder.

  In addition, the power supply to the brushless motor is performed by the power cord, but the power supply may be performed by a rechargeable battery (battery) that can be repeatedly charged. The storage battery may be disposed below the first circuit board 22 or below the handle portion 2A.

1 .. Shear wrench 2.. Housing 2 A.. Handle part 2 B... Motor housing 2 C.. Gear case 3.. Brushless motor 4 .. Rotation drive transmission mechanism 5. Gear mechanism 8 ·· Planetary gear mechanism 8A ·· Outer peripheral portion 11 ·· High tensile bolt 11A ·· Bolt tip 12 ·· Nut 21 ·· Switch mechanism 21A ·· Trigger 22 ·· First circuit board 22A ·· Switching element 22B · · Microcomputer 22C · · Cable 22D · · Connector 23 · · Lever 24 · · Rod cover 25 · · Power cord
31..Rotary shaft 31B.Pinion gear 32.Cooling fan 33.Second circuit board 34.Motor bearing 35.Rotor 36.Stator
51 ·· Rod 51a · · · Recess 52 · · Weight 52A · · Seat 52B · · Energizing portion 53 · · Weight biasing spring 54 · · · Spring 55 · · Plate rod 56 · · · Plate 61 · · · Inner socket 61A · · Spline portion 61B · · Tip biasing portion 61C · · Holding ball 61a · · Tip holding space 61b · · Opening hole 61c · · Seat receiving space 62 · · Socket biasing spring 63 · · Outer socket 63A · · Inner socket Restricting member 63a ... Nut holding space 63b ... Open hole 71 ... First gear 72 ... Second gear part 72A ... Second gear 72B ... First bevel gear 73 ... Third gear part 73A ... Second bevel gear 73B ··· First sun gear 81 · · First planetary gear 81A · · Second sun gear 82 · · Second planetary gear 82A · · Third sun gear 83a · · So Tsu door accommodating space 83 ... the third planetary gear 83A ·· output section 83B ·· spline receiving portion 83a ·· socket housing space 83b ·· recess

Claims (9)

A motor housing;
A brushless motor having an output shaft housed in the motor housing and extending in one direction;
A gear case coupled to the motor housing;
An inner socket that is rotationally driven by the brushless motor around a rotation axis extending in a direction intersecting the one direction;
An outer socket that is driven to rotate in a direction opposite to the inner socket by the brushless motor around the rotation axis;
A rotational drive transmission unit that is housed in the gear case and transmits rotational drive of the brushless motor to the inner socket and the outer socket;
A bolt fastening machine comprising: a handle portion extending in a direction toward the one direction from the gear case. A circuit board provided with a switching element for controlling energization of the brushless motor;
The brushless motor has a coil located radially outward of the output shaft, and a permanent magnet provided coaxially with the output shaft and facing the coil, and the switching element controls energization to the coil. The inner socket and the outer socket are located on the output shaft side of the brushless motor, and the circuit board is located on the opposite side of the brushless motor from the output shaft side. Item 2. A bolt tightening machine according to item 1.   The bolt tightening machine according to claim 2, wherein the handle portion is formed by a split handle housing, and the circuit board is sandwiched by the split handle housing.   4. The bolt tightening machine according to claim 3, wherein the split handle housing and the motor housing are integrally formed.   One end of the handle portion is connected to the gear case, and a power cord is connected to the other end, and the power cord is connected to the circuit board in the split handle housing. Item 5. The bolt tightening machine according to any one of items 3 and 4.   The switching element is provided on the brushless motor side of the circuit board, and a vent hole is formed in a side surface portion of the split handle housing in the vicinity of the split handle housing in which the switching element is accommodated. The bolt fastening machine according to any one of claims 3 to 5, wherein the bolt fastening machine is provided. A housing;
A brushless motor having an output shaft housed in the housing and extending in one direction;
An output unit driven by the brushless motor and extending in a direction crossing the one direction;
A gear case coupled to the housing;
A driving force transmission unit that is housed in the gear case and transmits the driving force of the brushless motor to the output unit;
A power tool comprising a handle portion extending in a direction from the gear case toward the one direction. A brushless motor having a rotating shaft extending vertically;
A housing for housing the brushless motor;
An output part extending in the front-rear direction and transmitting the driving force of the brushless motor;
A power tool comprising: a handle portion connected to the housing and extending in a vertical direction.   The brushless motor is disposed below the output unit, a circuit board provided with a switching element is disposed below the brushless motor, and the power cord protrudes from below the handle unit. The power tool according to claim 8, wherein

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