JP2006205274A - Multi-axis temporary fastening tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive multi-axis temporary fastening tool, easy in operation with lightness, and easy in replacing a part in maintenance. <P>SOLUTION: This multi-axis temporary fastening tool A temporarily fastens a plurality of bolts or nuts by using motive power of a driving means. The multi-axis temporary fastening tool A has a driving gear 3 rotating by the driving means, a plurality of driven gears 5, a toothed belt 4 wound on the driving gear 3 and the plurality of driven gears 5 and transmitting rotation of the driving gear 3 to the plurality of driven gears 5, and a socket 7 connected to the plurality of driven gears 5 and engaging with the bolts or the nuts. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a multi-axis temporary fastening tool for temporarily fastening a plurality of bolts or nuts simultaneously.

Conventionally, when attaching a tire wheel (hereinafter simply referred to as “wheel”) to an axle hub in an automobile assembly line or the like, first, a plurality of hub bolts (hereinafter simply referred to as “bolts”) installed in the hub are attached to the wheel. A bolt hole is penetrated, and each hub nut (hereinafter simply referred to as “nut”) is temporarily tightened to the bolt, and then the nut is finally tightened.
When the nuts are temporarily tightened, for example, a hand-held multi-axis temporary tightening tool as shown in Patent Document 1 or Patent Document 2 is used to temporarily tighten all of the plurality of nuts to each bolt at once.

  In the multi-axis temporary tightening tool of Patent Document 1, the rotational driving force to the socket for temporarily tightening each nut is transferred from the sprocket disposed on the rotational shaft to the sprocket disposed on the driven shaft of each socket. Is communicating through.

  Further, in the multi-axis temporary tightening tool of Patent Document 2, the rotational driving force to the socket for temporarily tightening each nut is coupled to the output gear of each socket from the input gear disposed on the rotary shaft. It is transmitted to the gear through an intermediate gear.

In multi-axis temporary tightening tools that temporarily tighten bolts or nuts with a motor as in Patent Documents 1 and 2, when tightening bolts or nuts, temporary tightening is performed with a tightening force less than a predetermined value. A torque limit mechanism (shutoff circuit) for stopping the motor when the value exceeds the value is always used (see, for example, Patent Document 3).
JP-A-8-187629 (paragraphs 0013 to 0019, FIGS. 1 to 3) JP-A-8-197440 (paragraphs 0013 to 0022, FIGS. 3 and 4) JP-A-6-39739 (paragraphs 0005 to 0006, FIG. 6)

  However, since the torque limit mechanism is indispensable in the multi-axis temporary fastening tools such as Patent Documents 1 and 2, the tightening torque is determined from the hydraulic impact device that constitutes the torque limit mechanism or the hydraulic pressure in the impact device. A detection switch or the like is required to detect. Along with this, the number of parts increases, and the structure and maintenance of the multi-axis temporary fastening tool become complicated and the whole size increases. As a result, the weight of the multi-axis temporary tightening tool is increased, and it is difficult for the operator to perform the temporary tightening operation by holding it in his / her hand, which makes it easy to get tired.

Furthermore, in the multi-axis temporary tightening tools of Patent Documents 1 and 2, it is necessary to replace gears, sprockets, endless chains, and the like due to wear and the like when used for a long time. When exchanging them, parts such as gears and sprockets have to be disassembled, and there is a problem that it takes time to exchange the parts.
In addition, parts such as gears, sprockets, and endless chains to be replaced at this time are relatively expensive, and there is a problem that replacement of parts is expensive.
In addition, since the multi-axis temporary fastening tool of patent document 2 uses the chain transmission means, there existed a problem that an operator was tired when performing temporary fastening work.

On the other hand, in the multi-axis temporary tightening tool of Patent Document 3, when attaching a tire assembly having an aluminum wheel to a hub of a vehicle body, the phases of nuts and bolts attached to the multi-axis temporary tightening tool may be shifted. is there. In this case, since the nut mounting hole of the aluminum wheel is designed to have a small diameter, the socket (attachment) of the multi-axis temporary tightening tool interferes with the periphery of the nut mounting hole of the aluminum wheel and bites into the motor. Is applied, the torque limit mechanism is activated, and the motor automatically stops. Then, it is necessary to suspend the temporary tightening work and perform the temporary tightening work again by accurately adjusting the phases of the nuts and bolts mounted on the multi-axis temporary tightening tool again. was there.
Note that “phase is shifted” means that the center line of the nut and the center line of the bolt are inconsistent and are in an inclined state.

  An object of the present invention is to provide an inexpensive multi-axis temporary fastening tool that is lightweight, easy to perform temporary fastening work, easily exchange parts during maintenance, and inexpensive.

  In order to solve the above-mentioned problem, the multi-axis temporary tightening tool according to claim 1 is a multi-axis temporary tightening tool for temporarily tightening a plurality of bolts or nuts using the power of the driving means, and the driving means A drive gear rotated by the plurality of driven gears, a toothed belt wound around the drive gear and the plurality of driven gears to transmit rotation of the drive gear to the plurality of driven gears; A socket connected to the plurality of driven gears and engaged with the bolt or the nut.

  According to the first aspect of the present invention, when the driving means rotates, the driving gear rotates accordingly, and the driving force is transmitted to the plurality of driven gears via the toothed belt. Then, the socket on which the bolt or nut is mounted rotates and the bolt or nut is temporarily tightened. The multi-axis temporary tightening tool does not have a torque limit mechanism, and has a simple structure including a driving means, a driving gear, a driven gear, a toothed belt, and a socket, so that maintenance is easy, and Compared with a conventional multi-axis temporary fastening tool including a chain mechanism and a gear transmission mechanism, maintenance can be performed at a low cost. Furthermore, the multi-axis temporary tightening tool achieves the same function as the torque limit mechanism by skipping teeth due to the loosening of the tension of the toothed belt. Therefore, the number of parts, weight and size are reduced, and the weight is reduced. This makes it easy to carry out the temporary tightening work and eliminates fatigue even if the temporary tightening work is performed for a long time.

  The multi-axis temporary tightening tool according to claim 2 is the multi-axis temporary tightening tool according to claim 1, wherein the drive gear engraves a tooth profile on a drive shaft interlocked with an output shaft of the drive means. It is characterized by.

  According to the second aspect of the present invention, since the drive gear is formed by directly engraving the tooth profile on the drive shaft, it is not necessary to assemble the drive gear on the drive shaft during assembly. The number of points, assembly man-hours, and assembly time can be reduced, the configuration of the multi-axis temporary fastening tool can be simplified, and parts can be easily replaced during maintenance.

  The multi-axis temporary tightening tool according to claim 3 is the multi-axis temporary tightening tool according to claim 1 or 2, wherein at least a tooth-shaped portion of the toothed belt is made of an elastic material. And

  According to the third aspect of the present invention, since at least the tooth profile portion (uneven portion) of the toothed belt is made of an elastic material, the toothed belt meshes with a driven gear coaxial with the socket when a load exceeding a predetermined value is applied to the socket. The toothed portion of the toothed belt is deformed and detached, and the toothed belt is idled by the rotational force of the driving means. Since the toothed belt is made of an elastic material and absorbs sound, it is possible to reduce the sound when skipping teeth.

  The multi-axis temporary tightening tool according to claim 4 is the multi-axis temporary tightening tool according to any one of claims 1 to 3, wherein the plurality of driven gears are arranged around the drive gear. The toothed belt is formed with uneven portions on the inner surface side and the outer surface side, the engagement portion of the drive gear is engaged with the uneven portion on the outer surface side, and the plurality of followers are formed on the uneven portion on the inner surface side. It is characterized by being wound so that the meshing portion of the gear is meshed.

  According to the fourth aspect of the present invention, the winding angle of the toothed belt around the driving gear can be made larger than the winding angle of the driven gear, so that the driving force of the driving gear can be efficiently applied to each driven gear. Can communicate.

  The multi-axis temporary tightening tool according to claim 5 is the multi-axis temporary tightening tool according to any one of claims 1 to 4, wherein the drive gear, the toothed belt, and the plurality of followers. The gear is characterized by being covered by a case made of polycarbonate.

  According to the fifth aspect of the present invention, the drive gear, the toothed belt, and the driven gear are covered with the case formed of polycarbonate, so that the weight of the multi-axis temporary fastening tool can be reduced.

  According to the multi-axis temporary tightening tool of the present invention, the drive gear, the driven gear, and the toothed belt have a torque limit function, thereby simplifying the structure of the multi-axis temporary tightening tool and facilitating replacement of parts during maintenance. And an inexpensive multi-axis temporary fastening tool can be provided. The multi-axis temporary tightening tool has a simplified structure, which reduces the number of parts and the overall weight of the tool, making it compact, reducing costs and weight, and allows the operator to hold it temporarily by hand. However, it is easy to work, and it is possible to make it hard to get tired even if working for a long time.

Next, the best mode for carrying out the invention (hereinafter referred to as “embodiment”) will be described with reference to FIGS.
Hereinafter, as an example of an embodiment of the present invention, a case where five nuts (hub nuts) installed on a wheel of an automobile are temporarily tightened to bolts (hub bolts) will be described as an example.
FIG. 1 is a side view having a partial cross section showing a use state of a multi-axis temporary fastening tool according to an embodiment of the present invention.

≪Car wheels≫
As shown in FIG. 1, a vehicle wheel W includes a tire W <b> 1 and a wheel W <b> 2, and the wheel W <b> 2 is fixed to a hub H of an axle by five bolts B and five nuts N. The nut N is finally fastened to the hub H with a constant torque by using a nut runner, but as a pre-process, a work of temporarily fastening the nut N to the tip of the bolt B is performed. The 5-axis multi-axis temporary fastening tool A of this embodiment is used for the temporary fastening operation.
The nut N is generally a cap nut for the wheel W2 of the automobile, but may be a normal hex nut.

≪Multi-axis temporary fastening tool≫
FIG. 2 is an enlarged schematic side view of a main part showing a multi-axis temporary fastening tool according to an embodiment of the present invention.
A multi-axis temporary fastening tool A shown in FIG. 2 is an electric fastening tool for temporarily fastening a plurality of nuts N to a hub H (see FIG. 1) using the power of a motor M, and is a battery type torque limit mechanism. A toothed belt 4 serving as a substitute is provided. The multi-axis temporary fastening tool A includes a housing 1, a motor M, a speed reduction mechanism 2, a drive gear 3, a toothed belt 4, a driven gear 5 (see FIG. 3), a driven shaft 6, The socket 7 is mainly provided.

≪Housing≫
The housing 1 is a member that covers the motor M, the speed reduction mechanism 2, the drive gear 3, the toothed belt 4, and the driven gear 5. The housing 1 includes a motor case 11 that covers the motor M, gear cases 12 and 13 that cover the speed reduction mechanism 2, a support member 17 that is installed in the gear case 13 and supports the bearing member 25, the toothed belt 4 and the driven gear. 5, and a front cover 15 installed on the front surface of the belt case 14. In addition, the housing 1 is formed with a grip (not shown) for an operator to hold by hand.

≪Motor≫
The motor M is a power source for rotating the nut N, and includes an output shaft Ma. The rotation of the output shaft Ma is transmitted to the drive gear 3 via the speed reduction mechanism 2. The motor M is covered with a motor case 11 made of metal or synthetic resin.
The motor M corresponds to “driving means” recited in the claims. The driving means is not limited to the motor M, and may be a means for rotating the output shaft Ma by means such as air pressure or hydraulic pressure.

≪Deceleration mechanism≫
As shown in FIG. 2, the speed reduction mechanism 2 is a speed reduction gear device for reducing the rotation of the motor M, and includes, for example, a planetary gear mechanism and is interposed between the motor M and the drive gear 3. . The speed reduction mechanism 2 includes a sun gear 21, a planetary gear 22, a carrier 23, bearing members 24 and 25, a ring gear 26, a main shaft member 27, and the gear cases 12 and 13.

The sun gear 21 is a gear that is connected to the distal end portion of the output shaft Ma and rotates integrally, and a plurality of planetary gears 22 are meshed with the peripheral portion. A carrier 23 for supporting the planetary gear 22 is disposed on the socket 7 side of the sun gear 21.
The planetary gear 22 is composed of a plurality of gears that rotate around the sun gear 21 and decelerate and rotate within the ring gear 26, and is supported on the carrier 23 by a shaft support pin.

  The carrier 23 is a member for fixing the shaft support pin, and the motor M side of the carrier 23 is rotatably disposed in the gear case 12 via the bearing member 24, and the socket 7 side is integrated with the carrier 23. The main shaft member 27 is rotatably disposed on the support member 17 in the gear case 13 via the bearing member 25.

  The bearing members 24 and 25 are, for example, ball bearings. The outer periphery of the bearing member 24 is inserted into the gear case 12 on the motor M side, and the inner periphery is fitted into the carrier 23. The bearing member 25 has an outer peripheral portion inserted into the support member 17 and an inner peripheral portion fitted into a main shaft member 27 formed integrally with the carrier 23.

As shown in FIG. 2, the gear cases 12 and 13 and the support member 17 are members for covering and holding the components of the speed reduction mechanism 2 and the drive shaft 3 a, and are light alloys such as an aluminum alloy, or polycarbonate. Is formed by engineering plastics and so on.
The gear case 12 is a member that covers the motor M side of the speed reduction mechanism 2 and holds the ring gear 26 and the bearing member 25, and is interposed between the motor case 11 and the gear case 13.
The gear case 13 is a member that covers the socket 7 side of the speed reduction mechanism 2 and holds the ring gear 26, the bearing member 25, and the drive shaft 3 a, and is interposed between the gear case 12 and the belt case 14. At the end of the gear case 13 on the socket 7 side, a bearing tube portion 13a for rotatably supporting the drive shaft 3a and screwing the cylindrical portion 14a of the belt case 14 is formed.
The support member 17 is a member that is fitted into the opening of the gear case 13 on the motor M side and fixes the bearing member 25.

The ring gear 26 is a ring-shaped internal gear that meshes with each planetary gear 22, is installed on the outer periphery of the planetary gear 22, and is fixed in the gear cases 12 and 13.
The main shaft member 27 is a shaft bar that is rotatably installed on the bearing member 25, the motor M side is integrally fixed to the carrier 23 by welding or the like, and the socket 7 side is a means such as a spline to the connecting portion 3b of the drive shaft 3a. It is fixed by.

≪Drive gear≫
As shown in FIG. 2, the drive gear 3 is a toothed belt pulley that rotates using the motor M as a power source, and transmits the rotational force from the motor M decelerated and rotated by the speed reduction mechanism 2 to the toothed belt 4. belongs to. The drive gear 3 includes a shaft-bar-like drive shaft 3a, a connecting portion 3b formed at the base end portion of the drive shaft 3a on the motor M side, a meshing portion 3d formed at the tip end portion on the socket 7 side, Is a member mainly comprising The drive gear 3 is formed by directly cutting a meshing portion 3d that meshes with the concavo-convex portion 4a of the toothed belt 4 on a drive shaft 3a that is linked to an output shaft Ma disposed in the motor M by cutting. The drive gear 3 is rotatably installed in a cylindrical metal made of a light metal such as an aluminum alloy, for example, in a connecting portion 3b for fixing to the main shaft member 27 and a cylindrical bearing tube portion 13a of the gear case 13. The flange portion 3c and the meshing portion 3d that forms a tooth shape meshing with the concavo-convex portion 4b of the toothed belt 4 are integrally formed by cutting or the like.

  The drive shaft 3a is assembled so that a connecting portion 3b formed on the motor M side is connected to a main shaft member 27 integrated with the carrier 23 so as to rotate integrally, and a central portion thereof is attached to the bearing tube portion 13a of the gear case 13. A meshing portion 3 d that is inserted into the shaft and provided at the tip on the socket 7 side is disposed in the center of the belt case 14.

FIG. 3 is an enlarged perspective view of a main part showing shapes of a drive gear, a driven gear, and a toothed belt of the multi-axis temporary fastening tool according to the embodiment of the present invention. 4 is a cross-sectional view taken along line XX in FIG.
As shown in FIGS. 3 and 4, the meshing portion 3 d of the drive gear 3 has a tooth groove having a curved surface shape such as an arc shape or a semicircular shape.

≪Toothed belt≫
As shown in FIG. 3, the toothed belt 4 is an endless belt that transmits the rotation of the drive gear 3 to the driven gear 5, and has flexibility such as synthetic rubber or synthetic resin in which reinforcing fibers are provided. Molded from an elastic material. The toothed belt 4 is formed such that at least the concavo-convex portions (tooth shape portions) 4a and 4b are formed of the elastic material and deformed when an excessive load of a predetermined value or more is applied to the toothed belt 4. Yes. The toothed belt 4 has concave and convex portions 4a and 4b continuously formed on the inner surface side and the outer surface side, the meshing portion 3d of the drive gear 3 is meshed with the concave and convex portion 4a on the outer surface side, and the concave and convex portions 4b on the inner surface side. The meshing portions 5a of the driven gear 5 are wound around so as to mesh with each other.

  As shown in FIG. 4, the concave and convex portion 4 b on the inner surface side of the toothed belt 4 is wound around five driven gears 5 (51 to 55) arranged around the drive gear 3. The drive gear 3 disposed at the center portion of the belt case 14 is wound around the concavo-convex portion 4 a on the outer surface side of the belt case 14.

For example, when the toothed belt 4 is wound around the drive gear 3 and the driven gear 5, first, the outer surface of the right driven gear 52 from the upper side of the meshing portion 5a of the upper driven gear 51 shown in FIG. The outer side surface of the driven gear 53 and the upper side surface of the meshing portion 3d of the drive gear 3 are wound around, and the lower left driven gear 54 and the outer surface of the meshing portion 5a of the left driven gear 55 are wound in this order. The
Since the toothed belt 4 wound in this way can make the winding angle θ1 of the toothed belt 4 around the driving gear 3 larger than the winding angle θ2 of the driven gears 51, 52, 55, the driving gear 3 can be efficiently transmitted to each driven gear 5.

<Uneven portion>
The concave and convex portions 4a and 4b are formed between arc-shaped convex portions continuously formed at the same pitch so as to mesh with the meshing portions 3d and 5a of the driving gear 3 and the driven gear 5, and the bottom surface is formed between the convex portions. It consists of a flat recess.
The concave and convex portions 4a and 4b are not limited to the circular arc shape as shown in FIGS. 3 and 4, and are, for example, a semicircular shape, a curved surface, a tooth profile shape such as a Nobikov gear tooth profile and an involute tooth profile. Also good.

5 is a cross-sectional view taken along line YY of FIG.
≪Driving gear≫
As shown in FIG. 4, the driven gear 5 is a toothed belt pulley that is rotated by the toothed belt 4 and rotates the driven shaft 6 (see FIG. 5). The five driven gears 51, 52, 53, 54, 55 are arranged so as to draw a regular pentagon. The driven gear 5 is integrally formed with an outer peripheral portion of a meshing portion 5a with which the concavo-convex portion 4b of the toothed belt 4 is meshed, and a shaft hole in the central portion is fitted to the driven shaft 6 to rotate together. The meshing portion 5 a of the driven gear 5 is formed by a tooth groove having a curved shape that meshes with the concavo-convex portion 4 b of the toothed belt 4. The meshing part 5a may be formed integrally with the driven shaft 6 (see FIG. 5).

≪Follow shaft≫
As shown in FIG. 5, the driven shaft 6 is a shaft rod for fixing the driven gear 5 and transmitting the rotation of the driven gear 5 to the socket 7, and is made of a light metal such as an aluminum alloy, for example. . The driven shaft 6 is fitted with the driven gear 5 in a substantially central portion, and a bearing member 14c for pivotally supporting the driven shaft 6 on the belt case 14 and the front cover 15 at both sides of the driven gear 5. 15a and a holding member 61 for fixing the bearing members 14c and 15a to the driven shaft 6 are fitted. The driven shaft 6 has a connecting portion 6a for connecting the driven shaft 6 to a first attachment 71 described later, and a screw hole 6b into which a screw for fixing the first attachment 71 is screwed to the connecting portion 6a. Is formed.

The connecting portion 6a has a quadrangular prism shape that is fitted into the rectangular through hole of the first attachment 71 (see FIG. 6), and is integrally formed at the end of the driven shaft 6 on the second attachment 73 side. . The connecting portion 6 a is disposed so as to protrude outward from the bearing member 15 a fitted to the front cover 15.
The screw hole 6b is formed on the end surface of the connecting portion 6a on the second attachment 73 side.
The holding member 61 includes, for example, a spacer that holds the driven gear 5 and the bearing members 14c and 15a installed on the driven shaft 6 at predetermined intervals, a retaining ring that prevents them from moving in the axial direction, The key includes a key for preventing the movement of the motor in the rotation direction.

<Belt case, front cover>
The belt case 14 and the front cover 15 are case bodies for covering the driven gear 5, the toothed belt 4, and the drive gear 3, and are formed of, for example, engineering plastic such as polycarbonate or light metal such as aluminum alloy. Yes. For this reason, the belt case 14 and the front cover 15 are lightweight and excellent in impact resistance, dimensional stability, heat resistance, and the like.

The belt case 14 is a member for pivotally supporting the driven shaft 6 that rotates integrally with the driven gear 5 via a bearing member 14c at a predetermined position (a position where the center line of the bolt B of the wheel W2 coincides). . The belt case 14 includes a cylindrical portion 14a, a screw hole 14b, a bearing member 14c, and a screw hole 14d.
The belt case 14 and the front cover 15 correspond to a “case” described in the claims.

The cylindrical portion 14 a is formed in a cylindrical shape so as to fit the belt case 14 to the bearing tube portion 13 a (see FIG. 2) of the gear case 13, and is integrally formed at the center of the belt case 14.
The screw hole 14b is a hole into which a set screw 18 for fixing the belt case 14 to the bearing tube portion 13a is screwed, and is formed at a plurality of locations on the cylindrical portion 14a.
The bearing member 14c is a bearing for rotatably supporting the driven shaft 6, and includes a pair of bearings. The bearing members 14c are respectively disposed on the front and back of shaft holes formed at five locations so as to draw a regular pentagon on the belt case 14.
The screw holes 14d are holes into which bolts 16 for fixing the front cover 15 to the belt case 14 are screwed, and are formed at a plurality of locations on the end surface of the belt case 14 on the socket 7 side.

  The front cover 15 is a disk-shaped member that closes the opening of the substantially case-like belt case 14 that houses the driven gear 5 and the toothed belt 4 and supports the socket 7 side of the driven shaft 6. . The front cover 15 includes a bearing member 15 a made of a bearing that supports the driven shaft 6 and a through hole 15 b through which the bolt 16 is inserted.

≪Socket≫
Each socket 7 is a member to be engaged with an outer peripheral portion of a nut N temporarily tightened to a bolt B, and is provided on a driven shaft 6 coaxial with each driven gear 5 rotated by the toothed belt 4 so as to rotate integrally. The five nuts N are assembled so that they can be temporarily tightened at a time. The socket 7 is installed at the tip of the driven shaft 6 so as to draw a regular pentagon on a concentric circle centered on the drive shaft 3a. The socket 7 includes a first attachment 71, a fastening member 72, a second attachment 73, a magnet 74, and a set screw 75.

The first attachment 71 is a member that is fitted into a quadrangular prism-shaped connecting portion 6 a formed at the tip of the driven shaft 6, is fixed by a fastening member 72, and rotates integrally with the driven shaft 6. The first attachment 71 has a substantially cylindrical shape in which a hole in which the quadrangular prism-shaped connecting portion 6a is inserted and a hole in which the head of the fastening member 72 is disposed are connected. The first attachment 71 and the second attachment 73 described later are made of, for example, engineering plastic such as polycarbonate or light metal such as aluminum alloy.
The fastening member 72 is made of a bolt or a screw that is screwed into a screw hole 6 b for fixing the first attachment 71 to the driven shaft 6.

  The second attachment 73 is a cylindrical member into which the nut N is inserted, and is inserted into the outer peripheral end portion on the front surface side with respect to the first attachment 71 via the magnet 74 and is provided with a plurality of stoppers provided on the outer peripheral portion. It is fixed by a screw 75 or the like. The second attachment 73 has a cylindrical portion 73a, an engaging portion 73b, a stepped portion 73c, and a screw hole 73d.

  The cylindrical portion 73a is a cylindrical member into which the magnet 74 is inserted and the outer peripheral end portion of the first attachment 71 is inserted, and a set screw 75 for fixing the second attachment 73 to the first attachment 71 is screwed. A screw hole 73d is formed.

FIG. 6 is an enlarged front view of the socket of the multi-axis temporary fastening tool according to the embodiment of the present invention.
The engaging portion 73b is a cylindrical portion with which a nut N made of a hexagonal nut is engaged. As shown in FIG. 6, a concave portion 73f formed by continuously forming twelve arc-shaped convex portions 73e. Are formed so that the six corners of the nut N are engaged with each other.
The stepped portion 73c is formed between the cylindrical portion 73a and the engaging portion 73b, and serves as a stopper for the magnet 74 and the nut N inserted into the second attachment 73 (see FIG. 5).
As shown in FIG. 6, for example, the screw holes 73 d are formed at four locations on the upper, lower, left, and right sides of the outer periphery of the second attachment 73, and the second attachment 73 is attached to the first attachment 73 by screwing a set screw 75. While being fixed to the attachment 71, the magnet 74 is fixed in the first attachment 71.

  The magnet 74 is a member for attracting the nut N to the engaging portion 73b with a magnetic force, is formed in a disk shape, and is fitted with an iron protection ring (not shown). The magnet 74 is inserted between the first attachment 71 and the stepped portion 73c in the socket 7 by inserting the first attachment 71 into the cylindrical portion 73a and fixing the magnet 74 with a set screw 75. It is arranged in the state which was made.

≪Action≫
Next, the operation of the multi-axis temporary fastening tool A will be described with reference to the drawings.
First, as shown in FIG. 1, the five bolts B planted in the hub H of the axle are inserted into the bolt holes W2b of the wheel W2 of the wheel W, and the five sockets 7 of the multi-axis temporary fastening tool A are inserted. A nut N is attached to each.

Next, holding the multi-axis temporary tightening tool A by hand, the five nuts N are brought into contact with the tips of the five bolts B, and the motor M is rotated clockwise (the direction in which the nuts N are fastened). Rotate to Then, the motor M rotates to rotate the output shaft Ma shown in FIG. 2 integrally.
When the output shaft Ma rotates, the planetary gear 22 meshed with the outer periphery of the output shaft Ma revolves to the left, and the carrier 23, the main shaft member 27, the drive shaft 3a, and the drive gear 3 decelerate to the left. Rotate.

  When the drive gear 3 rotates in the left direction, as shown by an arrow in FIG. 4, the toothed belt 4 wound around the engagement portion 3 d of the drive gear 3 with the concavo-convex portion 4 a on the outer surface is wound on the inner surface. The outer periphery of each driven gear 5 meshed with the meshing portion 5a on the side is moved in the right direction, and each driven gear 5 is rotated in the right direction to circulate.

  When each driven gear 5 rotates in the right direction, each driven gear 5, first attachment 71, and second attachment 73 rotate in the right direction as shown in FIG. The nut N inserted into the second attachment 73 is rotated to the right together with them, and is screwed into the bolt B and temporarily tightened.

  In this way, after the nut N is temporarily tightened to the bolt B, the multi-axis temporary tightening tool A is removed, and each nut N is finally tightened with a predetermined torque by the nut runner to complete the wheel W mounting operation.

For example, as shown in FIG. 2, when the phase of the nut N and the bolt B inserted into the socket 7 is slightly shifted, the screw portion of the bolt B does not screw into the screw portion of the nut N, and the second attachment 73 is Even if it interferes with the nut mounting hole W2a of the wheel W2, since the load is relatively small and the multi-axis temporary fastening tool A is not provided with a torque limit mechanism, the motor M continues to rotate.
In this case, when the operator finely adjusts the inclination and position of the multi-axis temporary tightening tool A, the threaded portion of the bolt B comes into engagement with the threaded portion of the nut N, and the nut N is temporarily tightened. Will be able to.

Further, when the phase of the nut N and the bolt B inserted into the socket 7 is greatly shifted, the screw portion of the bolt B is not screwed into the screw portion of the nut N, and the nut N and the bolt B are pressed against each other and bite. Rotational torque greater than the transmission force of the toothed belt 4 is applied to the driven shaft 6 that rotates integrally with the socket 7. Then, the socket 7, the driven shaft 6, and the driven gear 5 are stopped, and the meshing portion 5 a comes into pressure contact with the uneven portion 4 b of the toothed belt 4. In this case, when a load is applied to the toothed belt 4, the toothed belt 4 is formed of an elastic material, and therefore the toothed belt 4 gets over the tooth crest of the meshing portion 5a of the driven gear 5 to which the load is applied. As a result, the drive gear 3 only slips over the tooth crests of the concavo-convex portions 4 a and 4 b of the toothed belt 4.
Then, since excessive rotational torque is not applied to the driven shaft 6 side such as the motor M, it is possible to prevent the engaging portion 73b of the second attachment 73, the fixing portion of the socket 7, the motor M, and the like from being damaged.
Then, when the operator finely adjusts the inclination and position of the multi-axis temporary tightening tool A, the threaded portion of the bolt B comes to be engaged with the threaded portion of the nut N, and the nut N can be temporarily tightened. become able to. Moreover, since the toothed belt 4 is made of an elastic material and absorbs sound, the sound during operation can be reduced.

<< Effects of this embodiment >>
The multi-axis temporary fastening tool A according to the embodiment of the present invention has the following effects by having the above configuration and operation.
(1) Since the toothed belt 4 is less expensive than chains and gears, the cost of the multi-axis temporary fastening tool A can be reduced.
(2) Since the toothed belt 4 is made of an elastic material having flexibility, the toothed belt 4 is deformed when pulled strongly.
(3) Since the toothed belt 4 is lighter than a chain or gear, it contributes to the weight reduction of the multi-axis temporary tightening tool A and temporarily holds the multi-axis temporary tightening tool A by hand. Can be made easier.
(4) The multi-axis temporary tightening tool A has a structure corresponding to the fact that the torque limit function is unnecessary because the torque limit function of the electric tightening tool is substituted by the concave and convex portions 4a and 4b of the toothed belt 4. In addition, the weight can be reduced and the cost can be reduced.
(5) Since the multi-axis temporary tightening tool A rotates the driven gear 5 by the toothed belt 4 without rotating the drive gear 3 rotated by the motor M without the intermediate gear, the gear or gear is pivoted. The number of supporting shafts can be reduced, the structure can be simplified, and the weight can be reduced.
(6) Since the multi-axis temporary tightening tool A has the magnet 74 in the socket 7 and the nut N is attracted to the socket 7 by magnetic force, the nut N does not fall off and is temporarily tightened. It is possible to facilitate the work.
(7) The gear meshed with the toothed belt 4 comprises only the drive gear 3 and the driven gear 5, so that the intermediate gear used in the conventional endless chain mechanism, the shaft that supports the intermediate gear, Since no bearing is required, the number of parts can be reduced, and the weight of the multi-axis temporary fastening tool can be reduced.

≪Modification≫
The present invention is not limited to the above-described embodiment, and various modifications and changes can be made within the scope of the technical idea, and the present invention extends to these modifications and changes. Of course.

For example, the multi-axis temporary tightening tool A of the present invention has been described with reference to the case where the wheel W is attached to the hub H as shown in FIG. It can also be used for tightening, and can also be used for temporary tightening of the bolt B in addition to temporary tightening of the nut N.
The multi-axis temporary tightening tool A can be used even when a positive or negative screw is temporarily tightened by replacing the socket 7 provided on the driven shaft 6 with a screwdriver.

The number of sockets 7 and bolts B and nuts N is 5 as an example. However, the number is not limited to five, and the number may be appropriately increased or decreased depending on the installation location. Also good.
For example, it can also be used when a nut is temporarily fastened to a plurality of bolts arranged so as to draw a regular polygon or an irregular polygon on a flange or the like. In this case, the arrangement position of the socket 7 is arranged in accordance with the position of the bolt B, and the meshing portion 5a of each driven gear 5 arranged coaxially with the socket 7 is formed on the uneven portion 4b on the inner surface side of the toothed belt 4. Engage with each other.

Furthermore, the driven gear 5 shown in FIGS. 4 and 5 may be formed by integrally forming the driven shaft 6 made of a cylindrical metal member by cutting or the like.
The speed reduction mechanism 2 shown in FIG. 2 only needs to rotate the output shaft Ma at a reduced speed, and is not limited to the planetary gear mechanism. The speed reduction mechanism 2 may be, for example, a speed reduction gear mechanism or a belt mechanism that is configured to reduce and rotate with a worm wheel or a plurality of gears.

It is a side view which has a partial cross section which shows the use condition of the multi-axis temporary fastening tool which concerns on embodiment of this invention. It is a principal part expansion schematic side view which shows the multi-axis temporary fastening tool which concerns on embodiment of this invention. It is a principal part expansion perspective view which shows the shape of the drive gear of the multi-axis temporary fastening tool which concerns on embodiment of this invention, a driven gear, and a toothed belt. It is XX sectional drawing of FIG. It is YY sectional drawing of FIG. It is an enlarged front view of the socket of the multi-axis temporary fastening tool which concerns on embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Housing 3 Drive gear 3a Drive shaft 3d Engagement part (tooth shape)
4 Toothed belt 4a, 4b Concavity and convexity (tooth profile)
5 driven gear 5a meshing part 7 socket 14 belt case (case)
15 Front cover (case)
A Multi-axis temporary tightening tool B Bolt (nut)
M motor (drive means)
Ma output shaft

Claims (5)

A multi-axis temporary tightening tool for temporarily tightening a plurality of bolts or nuts using the power of the driving means,
A drive gear rotated by the drive means;
A plurality of driven gears;
A toothed belt wound around the drive gear and the plurality of driven gears for transmitting rotation of the drive gear to the plurality of driven gears;
A multi-axis temporary fastening tool comprising: a socket coupled to the plurality of driven gears and engaged with the bolt or the nut. The multi-axis temporary fastening tool according to claim 1,
The multi-axis temporary tightening tool, wherein the drive gear is formed by engraving a tooth shape on a drive shaft interlocked with an output shaft of the drive means. The multi-axis temporary tightening tool according to claim 1 or 2,
The toothed belt has at least a tooth profile portion made of an elastic material. The multi-axis temporary tightening tool according to any one of claims 1 to 3,
The plurality of driven gears are arranged around the drive gear,
The toothed belt has concavo-convex portions formed on the inner surface side and the outer surface side, the meshing portion of the drive gear meshes with the concavo-convex portion on the outer surface side, and meshes of the plurality of driven gears with the concavo-convex portions on the inner surface side. A multi-axis temporary tightening tool characterized in that the part is wound so as to be engaged. The multi-axis temporary fastening tool according to any one of claims 1 to 4,
The multi-axis temporary fastening tool, wherein the drive gear, the toothed belt, and the plurality of driven gears are covered with a case formed of polycarbonate.

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