Fastening tool

Abstract

The present invention provides a fastening tool. The fastening tool (1) has a tool body (10), an anvil (62), a pin holding part (65), a motor (21), a nut (41), a screw (45), a driven gear (411), and a receiving member (54). The pin holding part is movable relative to the anvil along a driving axis (A1). The nut is supported by the tool body so as to be rotatable about the driving axis and is driven to rotate by the power of the motor. The screw is connected to the pin holding part and moves along the driving axis by the rotation drive of the nut. The driven gear protrudes in a flange shape radially outward from the outer peripheral surface of the nut. The receiving member is disposed behind the driven gear and receives a reaction force acting rearwardly on the nut when the pin holding part moves forward by the rear surface of the driven gear. Accordingly, a technique for improving the arrangement of the reaction force receiving part in a fastening tool for fastening an object to be fastened by a fastener is provided.

Description

Technical Field

[0001] The present invention relates to a fastening tool configured to fasten a work object (workpiece) with a fastener. Background Art

[0002] There is known a fastening tool configured to use a ball screw mechanism to deform a fastener by strongly pulling a pin in the axial direction by moving a pin holding portion of a pin that holds the fastener relative to an anvil that can engage with a cylindrical portion of the fastener, thereby fastening a work object. The ball screw mechanism includes a nut and a screw. The nut is rotatably supported by a housing, and the screw moves linearly in the front-rear direction as the nut rotates and moves the pin holding portion. When the pin holding portion is moved while holding the pin, a reaction force acts on the nut. Therefore, a fastening tool having a structure for receiving the reaction force on the nut has been proposed (for example, refer to Patent Document 1).

[0003] [Prior Art Documents]

[0004] [Patent Documents]

[0005] Patent Document 1: Japanese Patent Application Laid-Open Publication No. 2018-89643 Summary of the Invention

[0006] [Technical Problems to be Solved by the Invention]

[0007] In the above-described fastening tool, the reaction force acting on the nut toward the rear is received by the inner housing via a thrust bearing disposed on the rear side of the rear end face of the nut. Therefore, the length of the fastening tool in the front-rear direction tends to be long.

[0008] An object of the present invention is to provide an improvement related to the arrangement of a reaction force receiving portion in a fastening tool that fastens a work object with a fastener.

[0009] [Technical Solutions for Solving the Technical Problems]

[0010] According to one aspect of the present invention, there is provided a fastening tool configured to fasten a work object with a fastener having a pin and a cylindrical portion. The fastening tool includes a tool body, an anvil, a pin holding portion, a motor, a rotating member, a moving member, a gear portion, and a receiving member.

[0011] The anvil is configured to engage with the cylindrical portion of the fastener. In addition, the anvil is connected to the tool body so as to extend along the drive axis. The drive axis defines the front-rear direction of the fastening tool. The pin holding portion is configured to hold the pin. In addition, the pin holding portion is configured to be movable relative to the anvil along the drive axis. The motor is housed in the tool body. The rotating member is cylindrical and is configured to be supported by the tool body so as to be rotatable about the drive axis. The rotating member is configured to be driven to rotate by the power of the motor. The moving member is connected to the pin holding portion. The moving member is configured to engage with the rotating member and move along the drive axis by the rotational drive of the rotating member. The gear portion projects outward in the radial direction from the outer peripheral surface of the rotating member. The gear portion has gear teeth on its outer periphery. The receiving member is disposed behind the gear portion, and the rear surface of the gear portion receives the reaction force acting rearward on the rotating member when the pin holding portion moves forward.

[0012] According to this technical solution, the receiving member is disposed behind the gear portion protruding from the outer peripheral surface of the nut, and is configured to receive the reaction force acting rearward through the rear surface of the gear portion. Therefore, compared with the case where the receiving member disposed behind the rear end surface of the nut receives the reaction force acting rearward, it is easy to suppress the enlargement of the fastening tool in the front-rear direction.

[0013] In one technical solution of the present invention, the receiving member may be formed of iron or an alloy mainly composed of iron. According to this technical solution, the strength of the receiving member capable of receiving a relatively large reaction force can be ensured.

[0014] In one technical solution of the present invention, the fastening tool may further include a thrust bearing disposed between the rear surface of the gear portion and the receiving member. According to this technical solution, the thrust bearing can allow the smooth rotation of the rotating member and can transmit the reaction force to the receiving member.

[0015] In one technical solution of the present invention, the thrust bearing may be configured such that when no reaction force acts on the rotating member, the thrust bearing is separated from the receiving member in the front-rear direction, and when a reaction force acts on the rotating member, the thrust bearing contacts the receiving member. According to this technical solution, since the dimensional accuracy required when assembling the receiving member and the thrust bearing in the contact state is not required, the manufacturing and assembly of the receiving member and the thrust bearing become easier.

[0016] In one technical solution of the present invention, the fastening tool may further include an elastic member interposed between the receiving member and the thrust bearing in the front-rear direction. According to this technical solution, it is possible to easily achieve the following structure: maintaining the separated state between the receiving member and the thrust bearing when no reaction force acts on the rotating member, and allowing the contact between the receiving member and the thrust bearing when a reaction force acts on the rotating member.

[0017] In one technical solution of the present invention, the tool body may at least include a first part and a second part that are connected to each other in the front-rear direction. Moreover, a bearing member is connected to the first part, and the first part is the part disposed on the front side among the first part and the second part. According to this technical solution, when the bearing member receives a reaction force toward the rear, loosening of the connection between the first part and the second part can be suppressed.

[0018] In one technical solution of the present invention, the bearing member may be disposed on the rear side of the second part and connected to the first part together with the second part. According to this technical solution, when the bearing member bears a reaction force toward the rear, while suppressing loosening of the connection between the first part and the second part, the connection between the bearing member and the first part and the assembly of the first part and the second part can be efficiently performed.

[0019] In one technical solution of the present invention, the tool body may further include a third part for holding a radial bearing, wherein the radial bearing supports a rotating member in a rotatable manner. Moreover, the third part is disposed on the rear side of the bearing member and connected to the first part together with the bearing member and the second part. According to this technical solution, the radial bearing can be easily disposed on the rear side of the bearing member. In addition, when the bearing member receives a reaction force toward the rear, while suppressing loosening of the connection between the first part and the second part and the connection between the first part and the third part, the connection between the bearing member and the first part and the assembly of the first part, the second part, and the third part can be efficiently performed. Description of the Drawings

[0020] Figure 1 is a cross-sectional view of a fastening tool.

[0021] Figure 2 is a perspective view of a fastening tool with an auxiliary handle installed.

[0022] Figure 3 is a cross-sectional view of the auxiliary handle.

[0023] Figure 4 is Figure 1 a partial enlarged view of...

[0024] Figure 5 is an explanatory diagram of a hook after changing the installation position.

[0025] Figure 6 is a rear view of the fastening tool.

[0026] Figure 7 is Figure 1 a partial enlarged view of...

[0027] Figure 8Perspective view of the fastening tool with the outer housing removed.

[0028] Figure 9 is Figure 1 partial enlarged view of.

[0029] Figure 10 is Figure 6 X-X cross-sectional view of.

[0030] Figure 11 Perspective view of the fastening tool with the battery holder and elastic member disassembled.

[0031] Figure 12 is Figure 1 XII-XII cross-sectional view of.

[0032] Figure 13 Explanation diagram of the fastening process.

[0033] Figure 14 Explanation diagram of the fastening process.

[0034] Figure 15 Explanation diagram of the fastening process.

[0035] Figure 16 is Figure 15 partial enlarged view of.

[0036] Figure 17 Explanation diagram of the fastening process.

[0037] [Explanation of reference numerals]

[0038] 1: Fastening tool; 10: Tool body; 101: Receiving portion; 103: Extension portion; 104: Front wall; 105: Rear wall; 106: Battery holding portion; 107: Bottom wall; 108: Protrusion; 109: Flange portion; 11: Front housing; 111: Mounting portion; 12: Central housing; 121: Rear wall; 13: Rear housing; 131: Guide member; 133: Flange portion; 14: Outer housing; 141: Upper wall; 143: Plate; 144: Threaded hole; 145: Hook; 146: Through hole; 147: Screw; 148: Opening portion; 149: Cover; 15: Battery holder; 150: Elastic member; 151: Upper wall; 153: Peripheral wall; 155: Guide rail; 157: Terminal block; 16: Nose; 17: Handle; 171: Trigger; 172: Switch; 19: Screw; 20: Controller; 21: Motor; 211: Motor body; 213: Motor shaft; 23: Operation display portion; 231: Operation portion; 233: Display portion; 27: Position sensor; 271: Magnet; 3: Drive mechanism; 31: Planetary reducer; 32: First intermediate shaft; 321: Drive gear; 33: Second intermediate shaft; 331: Idler gear; 4: Ball screw mechanism; 41: Nut; 411: Driven gear; 412: Gear teeth; 421: Bearing; 422: Bearing; 45: Screw; 450: Drive shaft; 451: Extension shaft; 455: Bearing; 51: Front side receiving portion; 511: Thrust bearing; 53: Rear side receiving portion; 54: Receiving member; 541: Main body; 543: Connecting portion; 55: Thrust bearing; 56: Elastic member; 62: Anvil; 621: Hole; 63: Connecting sleeve; 65: Pin holding portion; 651: Base portion; 653: Holding claw; 654: Front end portion; 66: Connecting member; 8: Fastener; 81: Pin; 811: Shaft portion; 815: Head; 85: Collar; 851: Flange; 91: Auxiliary handle; 911: Holding portion; 913: Contact portion; 915: Belt; 916: Bolt; 93: Battery; 931: Engaging groove; 933: Terminal portion; 935: Hook; A1: Drive axis; A2: Rotation axis; W: Work object. Detailed implementation

[0039] Next, the fastening tool 1 according to the embodiment will be described with reference to the drawings. The fastening tool 1 is an electric fastening tool that can fasten a work object using a fastener.

[0040] In addition, the fastening tool 1 can selectively use a variety of fasteners. However, in the following description, the fastener 8 shown in the example is Figure 1 illustrated. The fastener 8 is an example of a known fastener called a multi-piece swage type fastener. The fastener 8 is composed of a pin 81 and a collar 85.

[0041] The pin 81 includes a shaft portion 811 and a head portion 815 integrally formed at one end of the shaft portion 811. The collar 85 is a cylindrical member through which the shaft portion 811 can be inserted. A flange 851 is provided at one end of the collar 85. The pin 81 and the collar 85 are originally formed separately from each other. By pulling the pin 81 axially relative to the collar 85 with the fastening tool 1, the collar 85 is deformed, and the fastening target W is fastened by the head portion 815 of the pin 81 and the collar 85 riveted to the shaft portion 811 of the pin 81.

[0042] In addition, in a multi-component riveting fastener, there are a type in which a part of the shaft portion of the pin (also referred to as a pin tail or a mandrel) breaks and is pulled off (hereinafter, also simply referred to as a break type) and a type in which the shaft portion of the pin does not break and remains as it is (hereinafter, also simply referred to as a non-break type). The fastener 8 is of the non-break type.

[0043] Next, the schematic structure of the fastening tool 1 will be described.

[0044] As Figure 1 and Figure 2 shown, the outer contour of the fastening tool 1 is mainly formed by a tool body 10, a handle 17, and a nose 16. The tool body 10 houses a motor 21, a drive mechanism 3, etc. A battery 93 can be mounted on the tool body 10, and the fastening tool 1 operates by the power supplied from the battery 93. The handle 17 is a long cylindrical body for the user to hold. Both ends of the handle 17 are connected to the tool body 10, and the tool body 10 and the handle 17 form a substantially D-shaped annular portion (ring) as a whole. The nose 16 is connected to the tool body 10 so as to extend along a predetermined drive axis A1. The handle 17 is disposed on the side opposite to the nose 16 in the extending direction of the drive axis A1 and extends in a direction intersecting the drive axis A1 (specifically, a substantially orthogonal direction), and the handle 17 has a trigger 171 for the user to perform a trigger operation (pressing operation).

[0045] When the user engages the fastener 8 with the tip of the nose 16 and performs a trigger operation on the trigger 171, the motor 21 is driven. The drive mechanism 3 pulls the pin 81 rearward with force relative to the collar 85 by the power of the motor 21 to deform the fastener 8, thereby fastening the work object W.

[0046] Next, regarding the direction of the fastening tool 1, for the sake of convenience in description, the extending direction of the driving axis A1 is defined as the front-rear direction of the fastening tool 1. In the front-rear direction, the side where the tool head 16 is disposed is defined as the front side, and the opposite side (the side where the handle 17 is disposed) is defined as the rear side. In addition, the direction orthogonal to the driving axis A1 and corresponding to the longitudinal axis direction of the handle 17 is defined as the up-down direction. In the up-down direction, the end side of the handle 17 close to the driving axis A1 is defined as the upper side, and the opposite side (the end side far from the driving axis A1) is defined as the lower side. In addition, the direction orthogonal to the front-rear direction and the up-down direction is defined as the left-right direction.

[0047] Next, the detailed structure of the fastening tool 1 will be described.

[0048] First, the structures of the tool body 10 and the handle 17 will be described.

[0049] As Figure 1 and Figure 2 shown, the tool body 10 is formed by connecting the front housing 11, the central housing 12, the rear housing 13, and the outer housing 14.

[0050] The front housing 11 is a hollow body including a cylindrical front portion and a rectangular box-shaped rear portion that opens rearward. The central housing 12 is a substantially rectangular support body corresponding to the rear portion of the front housing 11 and is disposed behind the front housing 11. The rear housing 13 is a cylindrical body extending in the front-rear direction and has a rectangular flange portion 133 that protrudes radially outward from the front end portion. The rear housing 13 is disposed behind the upper side portion of the central housing 12. The front housing 11, the central housing 12, and the rear housing 13 are connected and integrated in the front-rear direction and mainly function as a support portion for rotatably supporting a nut 41 described later. The front housing 11, the central housing 12, and the rear housing 13 are made of metal (more specifically, made of aluminum alloy). In addition, the detailed connection structure of the front housing 11, the central housing 12, and the rear housing 13 will be described later.

[0051] On the other hand, the outer housing 14 is formed by connecting two split bodies separated in the left-right direction. More specifically, the two split bodies are connected by a plurality of screws (not shown) in a state where the upper side portions of the front housing 11 and the central housing 12 are exposed to the outside and the lower side portions of the front housing 11 and the central housing 12 and the rear housing 13 are clamped. Accordingly, the outer housing 14 is integrated with the front housing 11, the intermediate housing 12, and the rear housing 13. Thus, in the present embodiment, the tool body 10, which is an integrated housing, is constituted by the front housing 11, the central housing 12, the rear housing 13, and the outer housing 14. In addition, the outer housing 14 is made of synthetic resin.

[0052] In addition, the tool main body 10 includes a housing portion 101, an extension portion 103, and a battery holding portion 106.

[0053] The housing portion 101 is a part of the tool main body 10 for housing the motor 21 and the drive mechanism 3. The upper side portion of the housing portion 101 extends along the drive axis A1. The length of the upper side portion of the housing portion 101 in the front-rear direction is longer than the length of the lower side portion in the front-rear direction, and the rear end portion of the upper side portion of the housing portion 101 protrudes rearward more than the rear end of the lower side portion. The housing portion 101 is constituted by a part of the above-described front housing 11, central housing 12, rear housing 13, and outer housing 14.

[0054] The front end portion of the upper side portion of the housing portion 101 (the cylindrical portion of the front housing 11 exposed to the outside from the outer housing 14) is a portion where a connection sleeve 63 described later is screwed, and is configured as an internal thread portion. In addition, this portion is configured as an installation portion 111 capable of installing an auxiliary handle 91 (refer to Figure 2 ).

[0055] The auxiliary handle 91 is a well-known handle that is installed on the working tool by the user as needed and can be used in addition to the handle 17 as the main handle. Briefly, as shown in Figure 2 and Figure 3 , the auxiliary handle 91 includes a grip portion 911, an abutting portion 913, and a band 915. The grip portion 911 is an elongated portion for the user to grip. The protruding end portion of the abutting portion 913 has a semi-circular cross-section. The band 915 is formed in a ring shape and is connected to the grip portion 911 via a bolt 916. The user inserts the installation portion 111 into the ring-shaped space formed by the protruding end portion of the abutting portion 913 and the band 915, and rotates the grip portion 911 relative to the abutting portion 913 around its long axis, whereby the band 915 can be tightened, and thus the auxiliary handle 91 is installed on the working tool. Therefore, the diameter of the installation portion 111 is set such that the outer periphery of the installation portion 111 follows the protruding end portion of the abutting portion 913. In addition, the length of the installation portion 111 in the front-rear direction is set corresponding to the width of the band 915.

[0056] In addition, a hook 145 is installed on the upper wall 141 (the upper wall of the outer housing 14) of the housing portion 101 so that the fastening tool 1 can be used in a suspended manner. The hook 145 is a plate-like member bent in a U shape and is installed on the upper wall 141 by a screw 147. In the present embodiment, the housing portion 101 is configured such that the installation position of the hook 145 can be changed.

[0057] Specifically, as shown in Figure 4As shown, a metal plate 143 is fixed to the lower side of the upper wall 141. The plate 143 has five threaded holes 144 provided at equal intervals along the center line in the left - right direction. Five through - holes are provided on the upper wall 141, and these five through - holes are located at positions aligned with the threaded holes 144. On the other hand, through - holes 146 are provided at both end portions of the hook 145. The interval between the through - holes 146 of the hook 145 is equal to the interval between the two end threaded holes among the adjacent three threaded holes 144. Therefore, there are three installable positions for the hook 145. The user removes the hook 145 by removing the screw 147. For example, as Figure 5 shown, by aligning the through - holes 146 of the hook 145 with other threaded holes 144 at the same position and tightening the screw 147, the installation position of the hook 145 can be easily changed.

[0058] As Figure 1 and Figure 2 shown, the extension part 103 is a hollow part in the tool body 10 that protrudes from the lower end part of the housing part 101 and extends in a direction crossing the drive axis A1. More specifically, as a whole, the extension part 103 extends obliquely backward and downward from directly below the lower rear end part (the housing area of the motor 21) of the housing part 101. The extension part 103 is constituted by a part of the outer housing 14 and includes a pair of left - right side walls, a front wall 104, and a rear wall 105.

[0059] The battery holding part 106 is a part in the tool body 10 that extends rearward from the lower end part of the extension part 103. The battery holding part 106 is constituted by a part of the outer housing 14. The battery holding part 106 is configured to hold the battery 93 in a manner that the battery 93 can be removed. In the present embodiment, a battery holder 15 is elastically connected to the battery holding part 106, and the battery 93 is held in the battery holding part 106 via the battery holder 15. The battery holder 15 will be described in detail later.

[0060] As described above, the handle 17 is a long cylindrical body. As Figure 1 , Figure 2 and Figure 6 shown, the upper end of the handle 17 is connected to the rear end part of the upper side part in the housing part 101 (that is, the part that protrudes more rearward than the rear end of the lower side part of the housing part 101). The lower end of the handle 17 is connected to the rear end part of the battery holding part 106. Therefore, the handle 17 extends rearward from the lower side part of the housing part 101 and the extension part 103 and extends in the vertical direction. In addition, in the present embodiment, the handle 17 is made of synthetic resin and is formed by connecting the left - and - right split bodies to each other with screws. The left - and - right split bodies of the handle 17 are integrally formed with the left - and - right split bodies of the outer housing 14 respectively.

[0061] According to the above structure, the housing portion 101 extending in the front-rear direction, the extending portion 103 extending obliquely rearward and downward from the lower end portion of the housing portion 101, the battery holding portion 106 extending rearward from the lower end portion of the extending portion 103, and the handle 17 form an annular portion (ring), wherein both ends of the handle 17 are connected to the upper rear end portion of the housing portion 101 and the rear end portion of the battery holding portion 106.

[0062] Next, the internal structure of the tool body 10 (the housing portion 101, the battery holding portion 106, and the extending portion 103) will be described in sequence.

[0063] First, the internal structure of the housing portion 101 will be described.

[0064] As Figure 7 shown, a motor 21 and a drive mechanism 3 are housed in the housing portion 101. The motor 21 is housed in the rear end portion of the lower side portion of the housing portion 101. In the present embodiment, the motor 21 is a brushless DC motor. The motor 21 includes a motor main body 211 and a motor shaft 213. The motor main body 211 includes a stator and a rotor. The motor shaft 213 extends from the rotor and rotates integrally with the rotor. The rotation axis A2 of the motor shaft 213 extends parallel to the drive axis A1 (i.e., in the front-rear direction) on the lower side of the drive axis A1.

[0065] The drive mechanism 3 is a mechanism configured to move the pin 81 of the fastener 8 relative to the collar 85 in the front-rear direction by the power of the motor 21. More specifically, the drive mechanism 3 is configured to move the pin holding portion 65 relative to the anvil 62 connected to the tool body 10 along the drive axis A1, and the pin holding portion 65 is configured to hold the pin 81. The drive mechanism 3 of the present embodiment includes a planetary speed reducer 31, a drive gear 321 provided on a first intermediate shaft 32, an idler gear 331 provided on a second intermediate shaft 33, and a ball screw mechanism 4.

[0066] The planetary speed reducer 31 is disposed in the front side of the motor 21 in a coaxial manner with the motor 21 in the lower side portion of the housing portion 101. The planetary speed reducer 31 is a speed reducer using a planetary gear mechanism and is configured to increase the torque input from the motor shaft 213 and output the increased torque to the first intermediate shaft 32. In the present embodiment, the planetary speed reducer 31 is configured as a three-stage planetary speed reducer including three sets of planetary gear mechanisms. In addition, since the structure of the planetary gear mechanism itself is well known, a detailed description thereof is omitted here.

[0067] The first intermediate shaft 32 extends forward along the rotation axis A2 within the tool body 10 from the planetary speed reducer 31. The first intermediate shaft 32 is rotatably supported by two bearings respectively held on the front housing 11 and the central housing 12. The first intermediate shaft 32 is connected to the planet carrier of the third-stage planetary gear mechanism of the planetary speed reducer 31 and rotates integrally with the planet carrier about the rotation axis A2. The drive gear 321 is integrally provided on the outer peripheral portion of the first intermediate shaft 32.

[0068] The second intermediate shaft 33 extends parallel to the first intermediate shaft 32 on the upper side of the first intermediate shaft 32. The front end portion and the rear end portion of the second intermediate shaft 33 are respectively fitted and supported in the support holes formed in the front housing 11 and the central housing 12. The idler gear 331 is supported by a bearing on the second intermediate shaft 33 and can rotate relative to the second intermediate shaft 33. The idler gear 331 meshes with the drive gear 321 and the driven gear 411 of the nut 41 described later, but does not affect the speed ratio (gear ratio) between the two.

[0069] The ball screw mechanism 4 is mainly composed of a nut 41 and a screw 45. In the present embodiment, the ball screw mechanism 4 is configured to convert the rotational motion of the nut 41 into the linear motion of the screw 45, so that the pin holding portion 65 described later moves linearly.

[0070] The nut 41 is a long cylindrical member and is supported by the tool body 10 in a state where its movement in the front-rear direction is restricted and it can rotate about the drive axis A1. More specifically, the front end portion and the rear end portion of the nut 41 are respectively rotatably supported by a bearing 421 and a bearing 422, where the bearing 421 is held by the front housing 11 and the bearing 422 is held by the rear housing 13. Both the bearing 421 and the bearing 422 are radial bearings.

[0071] In addition, a driven gear 411 is provided on the nut 41. The driven gear 411 is a flange-shaped portion protruding radially outward from the outer peripheral surface of the nut 41, and has gear teeth 412 on its outer periphery. The driven gear 411 is integrally formed with the nut 41. The driven gear 411 is disposed between the bearing 421 and the bearing 422. More specifically, the driven gear 411 is disposed at a position closer to the front side than the center position of the nut 41 in the axial direction (front-rear direction). Therefore, the portion of the nut 41 on the rear side of the driven gear 411 is longer, and in the front-rear direction, the space between the rear bearing 422 and the driven gear 411 is larger than the space between the front bearing 421 and the driven gear 411.

[0072] The screw 45 engages with the nut 41 in a state where its rotation about the drive axis A1 is restricted and it can move in the front - rear direction along the drive axis A1. More specifically, the screw 45 is configured as an elongated body and is inserted through the nut 41 so as to extend along the drive axis A1. Although detailed illustrations are omitted, spiral tracks are defined by grooves formed on the inner peripheral surface of the nut 41 and the outer peripheral surface of the screw 45, respectively. A plurality of balls are arranged in the tracks so as to be rollable. The screw 45 engages with the nut 41 via these balls.

[0073] As Figure 8 shown, a pair of arms extending leftward and rightward from the screw 45 are provided at the rear end portion of the screw 45. Bearings 455 are mounted at the tip portions of the respective arms. On the other hand, a pair of left - right guide members 131 are fixed to the tool body 10 (specifically, the rear housing 13). The bearings 455 are arranged in the guide grooves of the guide members 131. With such a structure, when the nut 41 rotates about the drive axis A1, the screw 45 moves linearly in the front - rear direction relative to the nut 41 and the tool body 10.

[0074] In addition, as Figure 7 shown, an extension shaft 451 is coaxially connected and fixed to the rear end portion of the screw 45 and is integrated with the screw 45. Hereinafter, the integrated screw 45 and extension shaft 451 are also collectively referred to as the drive shaft 450.

[0075] Although detailed descriptions are omitted, the fastening tool 1 of the present embodiment can not only fasten the above - mentioned non - rupture type fasteners 8, but also fasten work objects using rupture type fasteners by replacing the anvil 62 and the pin gripping portion 65 described later (refer to Figure 1 ). Therefore, as Figure 1 shown, the drive shaft 450 has a through - hole penetrating the drive shaft 450 along the drive axis A1, which serves as a passage for recovering the pin tails separated from the rupture type fasteners. An opening 148 having a circular cross - section is formed in the rear wall of the upper side portion of the housing portion 101. In the case of using the non - rupture type fasteners 8, an end cap 149 covering the opening 148 is detachably mounted on the rear wall of the upper side portion of the housing portion 101. On the other hand, although detailed descriptions and illustrations are omitted, in the case of using rupture type fasteners, a container capable of accommodating the pin tails can be mounted instead of the end cap 149.

[0076] In the fastening process, when the screw 45 moves in the front - rear direction relative to the nut 41, a strong axial force (also referred to as a thrust load) as a reaction force acts on the nut 41 in the extending direction (front - rear direction) of the drive axis A1. Therefore, as Figure 7As shown, a front-side bearing portion 51 is provided on the front side of the nut 41 in the front-rear direction, and the front-side bearing portion 51 is used to bear the forward reaction force acting on the nut 41. In addition, a rear-side bearing portion 53 is provided in the space between the rear-side bearing 422 and the driven gear 411, and the rear-side bearing portion 53 is used to bear the rearward reaction force acting on the nut 41.

[0077] The front-side bearing portion 51 is constituted by a thrust bearing 511, and the thrust bearing 511 is arranged in the front-rear direction between the rear end face of the connection sleeve 63 connected to the tool body 10 and the front end face of the nut 41. More specifically, the thrust bearing 511 includes two raceways and a plurality of rolling elements arranged between the raceways, and the two raceways are respectively arranged in contact with the rear end face of the connection sleeve 63 and the front end face of the nut 41. With such an arrangement, the thrust bearing 511 allows the nut 41 to rotate smoothly during the tightening process, bears the forward reaction force from the nut 41 generated by the rearward movement of the screw 45, and transmits the reaction force to the connection sleeve 63.

[0078] On the other hand, as Figure 9 shown, the rear-side bearing portion 53 is arranged on the rear side of the rear end face of the driven gear 411 in the front-rear direction. In the present embodiment, the rear-side bearing portion 53 includes a bearing member 54, a thrust bearing 55, and an elastic member 56, wherein the thrust bearing 55 is arranged between the driven gear 411 and the bearing member 54, and the elastic member 56 is clamped between the thrust bearing 55 and the bearing member 54.

[0079] The bearing member 54 is a member for bearing the rearward reaction force from the nut 41 via the rear end face of the driven gear 411 during the tightening process, and this reaction force is generated as the screw 45 moves forward, and the bearing member 54 is arranged on the rear side of the rear end face of the driven gear 411. In addition, the rear end of the bearing member 54 is located at a position closer to the front side than the rear end of the nut 41 (more specifically, closer to the front side than the bearing 422). The bearing member 54 is made of metal. In the present embodiment, in order to ensure sufficient strength, the bearing member 54 is formed of iron (or an alloy mainly composed of iron).

[0080] As Figures 8 - 10 shown, the bearing member 54 is fixed to the front housing 11 in the tool body 10 by a plurality of screws 19. More specifically, the bearing member 54 includes a cylindrical main body 541 and a rectangular plate-shaped connecting portion 543 protruding radially outward from the main body 541.

[0081] As described above, the front housing 11, the central housing 12, and the rear housing 13 are connected to each other in the front-rear direction. The connecting portion 543 of the receiving member 54 is clamped from the front and rear by the rear wall 121 of the central housing 12 and the flange portion 133 of the rear housing 13. The front end portion and the rear end portion of the main body 541 of the receiving member 54 are configured to project into the central housing 12 and the rear housing 13, respectively. Further, a screw 19 is inserted through the through holes formed in the flange portion 133 of the rear housing 13, the connecting portion 543 of the receiving member 54, and the rear wall 121 of the central housing 12 from the rear side of the flange portion 133 of the rear housing 13, and is fastened to the threaded hole formed in the front housing 11. That is, the receiving member 54, together with the central housing 12 and the rear housing 13, is fixed to the front housing 11 from the rear side by the screw 19. With this structure, the assembly of the receiving member 54 to the tool main body 10 and the assembly of the front housing 11, the central housing 12, and the rear housing 13 can be performed efficiently.

[0082] As Figure 9 shown, in the present embodiment, in order to ensure smooth rotation of the nut 41, the receiving member 54 is configured to receive a reaction force (axial force) from the nut 41 via a thrust bearing 55. Therefore, the thrust bearing 55 is arranged between the driven gear 411 and the receiving member 54 in the front-rear direction. Further, in the present embodiment, cylindrical rollers are used as rolling elements in the thrust bearing 511 of the front receiving portion 51 (see Figure 7 ). On the other hand, needle rollers are used as rolling elements in the thrust bearing 55 of the rear receiving portion 53. This is because it is considered that, in the tightening process, while the screw 45 moves rearward and strongly pulls the pin 81, the reaction force acting on the nut 41 toward the rear is smaller when the screw 45 returns forward compared to this, and thus axial space is saved in the rear receiving portion 53.

[0083] The elastic member 56 is a rubber annular member (so-called O-ring), and is arranged between the thrust bearing 55 and the connecting portion 543 of the receiving member 54 in the front-rear direction. More specifically, the elastic member 56 is arranged in a slightly compressed state between the thrust bearing 55 and the rear wall 121, and the rear wall 121 is fixed to the front side of the connecting portion 543. When no reaction force acting on the nut 41 toward the rear is applied, the thrust bearing 55 is held at a position where the front-side race contacts the rear end surface of the driven gear 411 (more specifically, the rear end surface of the root portion of the driven gear 411 that is radially inward (on the drive axis A1 side) of the gear teeth 412) by the biasing force of the elastic member 56. At this time, the thrust bearing 55 (specifically, the rear-side race) and the receiving member 54 (specifically, the main body 541) are slightly separated from each other in the front-rear direction. That is, when no reaction force acting on the nut 41 toward the rear is applied, there is a small gap between the thrust bearing 55 and the receiving member 54.

[0084] When a reaction force acting rearward is applied to the nut 41, the elastic member 56 allows the nut 41 and the thrust bearing 55 to move rearward to a position where the thrust bearing 55 (specifically, the rear end face of the rear side race) abuts against the receiving member 54 (specifically, the front end face of the main body 541) (see Figure 16 ), and the details will be described later.

[0085] Thus, in the present embodiment, the receiving member 54 receives a reaction force acting rearward on the nut 41 via the driven gear 411 at the rear side of the driven gear 411. In particular, in the present embodiment, the rear end of the receiving member 54 is disposed at a position closer to the front side than the rear end of the nut 41. Therefore, compared with the structure that receives the reaction force at the rear side of the rear end face of the nut 41, the fastening tool 1 can be prevented from becoming longer in the front-rear direction.

[0086] In addition, when attempting to assemble the receiving member 54 and the thrust bearing 55 in a contact state, the receiving member 54 and the thrust bearing 55 need to have high dimensional accuracy. Further, in the present embodiment, since the receiving member 54 is connected to the front housing 11 with the central housing 12 interposed therebetween, errors may also occur during assembly. In contrast, in the present embodiment, the receiving member 54 and the thrust bearing 55 are arranged with the elastic member 56 interposed therebetween such that when no reaction force acting rearward is applied to the nut 41, the two are separated from each other in the front-rear direction, and when a reaction force is applied to the nut 41, the two come into contact with each other. Therefore, the receiving member 54 and the thrust bearing 55 do not need to have such high dimensional accuracy. Thus, manufacturing and assembly become easy.

[0087] Next, the internal structure of the battery holding portion 106 will be described.

[0088] As described above, the battery holder 15 is elastically connected to the battery holding portion 106. As shown in Figure 8 、 Figure 11 and Figure 12 , the battery holder 15 is separately arranged from the battery holding portion 106 (outer housing 14) and is held by the battery holding portion 106 via the elastic member 150.

[0089] More specifically, the battery holding portion 106 includes a pair of left and right side walls, an upper wall, a bottom wall 107, and a rectangular parallelepiped-shaped protruding portion 108 that protrudes downward from the central portion of the bottom wall 107. The lower end portion of the protruding portion 108 has a rectangular flange portion 109 that protrudes outward. The elastic member 150 is formed in a rectangular ring shape, is mounted on the outer periphery of the protruding portion 108, and is held between the bottom wall 107 and the flange portion 109. A groove that covers the entire circumference is formed in the outer peripheral portion of the elastic member 150. The battery holder 15 has a rectangular frame-shaped upper wall 151 and a peripheral wall 153 that protrudes downward from the upper wall 151. The battery holder 15 is held on the protruding portion 108 by the elastic member 150 in a state where the peripheral edge portion inside the upper wall 151 is fitted into the groove of the elastic member 150. With such an elastic connection structure, the battery holder 15 can move relative to the battery holding portion 106 in all directions including the front-rear direction, left-right direction, and up-down direction.

[0090] The battery holder 15 has a structure for detachably holding the battery 93. The battery 93 is a rechargeable battery (also referred to as a battery pack) having a known structure, and has a pair of engaging grooves 931 provided on the side surface and a terminal portion 933 provided on the upper end portion. Correspondingly, the battery holder 15 has: a pair of guide rails 155 that can engage with the pair of engaging grooves 931; and a terminal block 157 that has a terminal portion that can be electrically connected to the terminal portion 933.

[0091] The pair of guide rails 155 extend in the front-rear direction inside the lower end portions of the left and right side walls of the peripheral wall 153 of the battery holder 15 and can slidably engage with the pair of engaging grooves 931. The terminal block 157 is held at the central portion of the lower end portion of the battery holder 15. In a state where the engaging groove 931 is engaged with the rail 155, when the battery 93 slides forward from the rear side relative to the battery holder 15 and is disposed at a predetermined position, the terminal portion 933 of the battery 93 is electrically connected to the terminal portion of the terminal block 157. In addition, a hook 935 that can move in the up-down direction is provided at the upper end portion of the battery 93. When the battery 93 is disposed at a predetermined position, the hook 935 engages with a locking recess (not shown) of the battery holder 15 to prevent the battery 93 from falling off the battery holder 15.

[0092] In addition, in the present embodiment, both the elastic member 150 and the battery holder 15 are composed of split bodies that are split left and right. When assembling the battery holder 15 to the tool main body 10, first, the left and right split bodies of the elastic member 150 are inserted into the space between the bottom wall 107 and the flange portion 109 from the left and right of the protruding portion 108. And, the left and right split bodies of the battery holder 15 are connected to each other by screws in a state where the terminal block 157 is clamped and the upper wall 151 is fitted into the groove of the elastic member 150 from the left and right sides. In this way, the battery holder 15 is elastically connected to the tool main body 10 (battery holding portion 106).

[0093] In a state where the battery 93 is mounted on the battery holder 15, for example, when the battery 93 is impacted due to dropping, the battery holder 15 elastically deforms the elastic member 150 and moves relative to the tool body 10 together with the battery 93. Accordingly, the impact on the battery 93 is alleviated, and the possibility of battery damage is reduced.

[0094] Next, the internal structure of the extension portion 103 will be described.

[0095] As Figure 1 shown, a controller 20 for controlling the operation of the fastening tool 1 is housed in the extension portion 103. The internal space of the extension portion 103 communicates with the internal space of the housing portion 101 that houses the motor 21 and the drive mechanism 3, and the internal space of the battery holding portion 106 where the battery 93 is mounted. Therefore, it is possible to facilitate the wiring of the controller 20 to the motor 21 and the terminal portion of the battery holder 15, etc. In addition, although detailed illustrations are omitted, the controller 20 includes a housing, a circuit board housed in the housing, and a control circuit mounted on the circuit board. In addition, in the present embodiment, the control circuit is configured as a microcomputer including a CPU, a ROM, a RAM, a timer, etc., and controls the operation of the fastening tool 1 including the drive of the motor 21.

[0096] The controller 20 is integrally formed in a substantially rectangular parallelepiped shape having a length, a width, and a thickness. The controller 20 is disposed adjacent to the front wall 104 within the extension portion 103. In addition, among the length, width, and thickness of the controller 20, the length is the largest and the thickness is the smallest. The controller 20 is disposed such that its length direction is inclined with respect to the drive axis A1. In the present embodiment, the controller 20 is disposed such that its length direction coincides with the extending direction of the extension portion 103. In addition, the width direction and the thickness direction of the controller 20 coincide with the left-right direction of the extension portion 103 and the facing direction of the front wall 104 and the rear wall 105, respectively. Since the extension portion 103 extends obliquely with respect to the drive axis A1, it is easiest to ensure the length in the extending direction. Therefore, by setting the orientation of the controller 20 in this way, the controller 20 can be reasonably disposed within the extension portion 103 while suppressing the width in the left-right direction or the thickness in the front-rear direction of the extension portion 103.

[0097] In addition, as Figure 11 and Figure 12 shown, an operation display unit 23 is provided on the extension portion 103. The operation display unit 23 includes an operation unit 231 capable of inputting various information in response to an external operation of the user and a display unit 233 capable of displaying various information. The operation display unit 23 is disposed on the rear wall 105 of the extension portion 103 (i.e., the surface facing the handle 17) so as to be operable and visually confirmable from the rear side.

[0098] In the present embodiment, the operation unit 231 includes a plurality of push-button switches. For example, a user can input control conditions of the motor 21 (e.g., a target value of the drive current of the motor 21 corresponding to the type of fastener used) by operating the operation unit 231. The operation unit 231 is connected to the controller 20 via a wire (not shown) and outputs a signal corresponding to the input information to the controller 20. In addition, the display unit 233 includes a plurality of 7-segment LEDs. The display unit 233 is connected to the controller 20 via a wire (not shown) and displays various information (e.g., information related to the set control conditions of the motor 21) according to a control signal from the controller 20.

[0099] Next, the detailed configuration and internal structure of the handle 17 will be described.

[0100] As Figure 1 shown, a trigger 171 is provided on the front surface side of the upper end portion of the handle 17. In addition, as described above, the upper end of the handle 17 is connected to the rear end portion of the upper side portion of the housing portion 101. Therefore, the upper end portion of the handle 17 is disposed in the lower side portion of the housing portion 101, that is, in the rear region of the motor 21 (motor main body 211). In addition, the rear region of the motor main body 211 can also be said to be a region where the motor main body 211 is projected rearward. Therefore, as Figure 6 shown, when viewed from the rear side, the upper end portion of the handle 17 overlaps with a region inside the outer periphery of the motor main body 211 (a region inside the outer periphery of the stator). In addition, as Figure 1 shown, the trigger 171 is disposed on the rotation axis A2 of the motor shaft 213. The central portion and the lower end portion of the handle 17 are disposed in the rear region of the extension portion 103.

[0101] In addition, the handle 17 is thin to facilitate gripping by the user. In addition, the distance between the handle 17 and the tool main body 10 (the lower side portion of the housing portion 101 and the extension portion 103) is set such that when the user holds the handle 17, there is a certain degree of space between the user's hand and the tool main body 10. On the other hand, as Figure 6 shown, the width of the extension portion 103 in the left-right direction is wider than the width of the handle 17. In addition, the operation display unit 23 is disposed on the rear wall 105 of the extension portion 103 in a manner facing the lower end portion of the handle 17 and in a direction that can be operated from the rear side. Therefore, even when the user holds the handle 17, the user can easily visually confirm the operation unit 231 and thus can easily perform the operation.

[0102] As Figure 1As shown, inside the handle 17, adjacent to the rear side of the trigger 171, a switch 172 is housed. The switch 172 is normally kept in an off state and becomes an on state according to the pulling operation of the trigger 171. The switch 172 is electrically connected to the controller 20 (control circuit) through a wire (not shown). When the switch 172 becomes an on state, it outputs an on signal to the controller 20.

[0103] The detailed structure of the head 16 will be described below. As Figure 1 and Figure 10 shown, the head 16 mainly consists of an anvil 62, a connecting sleeve 63, a pin gripping part 65, and a connecting member 66.

[0104] The anvil 62 is a long cylindrical body configured to be engageable with the collar 85 of the fastener 8. The anvil 62 has a hole 621 extending along the axial direction. In addition, the diameter of the hole 621 is substantially uniform in the front part of the anvil 62, but only the diameter of the front end portion increases towards the front end. That is, the inner peripheral surface of the front end portion of the anvil 62 is configured as a tapered surface. On the other hand, in the rear part of the anvil 62, the diameter of the hole 621 gradually increases towards the rear to a specified position and becomes uniform on the rear side of the specified position. In addition, in the present embodiment, the front part and the rear part of the anvil 62 are formed by connecting separate members that connect to each other, but the whole of the anvil 62 may also be formed of a single member.

[0105] The anvil 62 is connected to the tool body 10 via the connecting sleeve 63 and extends along the driving axis A1. The connecting sleeve 63 is a long cylindrical body. The rear end portion of the connecting sleeve 63 is screwed into the inner peripheral portion of the mounting portion 111 (the cylindrical portion of the front housing 11 that protrudes from the outer housing 14 to the outside) of the tool body 10. The front end portion of the connecting sleeve 63 is screwed into the inner peripheral portion of the rear end portion of the anvil 62.

[0106] The pin gripping part 65 is configured to be able to grip the pin 81 of the fastener 8 and is held so as to be able to move relative to the anvil 62 in the front-rear direction along the driving axis A1. The pin gripping part 65 includes a base portion 651 and a plurality of gripping claws 653. In addition, the base portion 651 and the plurality of gripping claws 653 are integrally formed.

[0107] The base portion 651 is a cylindrical portion that can slide inside the rear part of the anvil 62. The base portion 651 is connected to the screw 45 via the connecting member 66. The connecting member 66 is a cylindrical member that can slide inside the connecting sleeve 63. The rear end portion of the connecting sleeve 63 is screwed into the front end portion of the screw 45. The front end portion of the connecting member 66 is screwed into the inner peripheral portion of the base portion 651 of the pin gripping part 65.

[0108] A plurality of gripping claws 653 extend forward from the front end of the base portion 651 and are disposed within the front side portion of the anvil 62. The plurality of gripping claws 653 are arranged in a virtual circumferential shape at equal intervals centered on the drive axis A1. When the pin gripping portion 65 is located at Figure 1 the initial position shown, the front end portion 654 of the gripping claw 653 protrudes forward from the front end of the hole 621. The radial thickness of the front end portion 654 is set to be slightly larger than that of other portions. The rear end of the front end portion 654 is configured as a tapered portion whose outer diameter decreases as it approaches the rear. With this structure, as the pin gripping portion 65 moves rearward from the initial position and the front end portion 654 enters the hole 621 of the anvil 62, the gripping claw 653 is pushed radially inward, and the gripping force of the gripping claw 653 on the pin 81 increases. In addition, due to the tapered portion formed on the front end portion 654 and the tapered surface formed on the front end portion of the anvil 62, the front end portion 654 can smoothly enter the hole 621.

[0109] In addition, as described above, the fastening tool 1 can also perform the fastening of a work object using a rupture type fastener by replacing the anvil 62 and the pin gripping portion 65. Although detailed description and illustration are omitted, the anvil and the pin gripping portion for the rupture type fastener have substantially the same functions as the above-described anvil 62 and pin gripping portion 65, although their shapes are different.

[0110] As described above, in the fastening tool 1 of the present embodiment, within the tool body 10, the motor 21 and the ball screw mechanism 4 are arranged such that the rotation axis A2 of the motor shaft is parallel to the drive axis A1. Moreover, a part (upper end portion) of the handle 17 is disposed within the rear region of the motor body 211.

[0111] Therefore, compared with the case where the motor 21 is arranged such that the rotation axis A2 and the drive axis A1 extend in directions intersecting each other, it is easier to arrange the motor 21 and the ball screw mechanism 4 in close proximity. In addition, the first intermediate shaft 32 and the second intermediate shaft 33 for transmitting power from the motor 21 to the ball screw mechanism 4 can also be arranged parallel to the rotation axis A2 and the drive axis A1. With such a structure, efficient power transmission with reduced energy loss can be performed from the motor 21 to the ball screw mechanism 4. In addition, the overall drive mechanism 3 can be made compact.

[0112] Moreover, since a part of the handle 17 is disposed in the rear region of the motor body 211, the user can hold the handle 17 at a position relatively close to the drive axis A1 (which is also relatively close to the heavy object), thereby improving the operability. In particular, in the present embodiment, the trigger 171 is disposed on the rotation axis A2 of the motor shaft 213. Therefore, by reliably guiding the user's hand to the part (upper end part) of the handle 17 disposed in the rear region of the motor body 211, it is possible to contribute to improving the operability. In addition, since the tool body 10 and the handle 17 are connected in a manner to form an annular part, compared with the case where the handle 17 is connected in a cantilever shape, the strength of the handle 17 can be improved and the possibility of breakage can be reduced.

[0113] The fastening process of the work object W using the fastener 8 will be described below.

[0114] First, the user appropriately inputs the control conditions of the motor 21 (for example, the target value of the drive current) via the operation unit 231. In addition, the user pre-fixes the fastener 8 to the work object W. In addition, pre-fixing means that, as Figure 1 shown, the shaft part 811 of the pin 81 is inserted through the through hole formed in the work object W in such a manner that the head 815 of the fastener 8 abuts against one surface of the work object W, and the collar 85 is loosely fitted and engaged with the shaft part 811 from the opposite surface side of the work object W.

[0115] As Figure 1 shown, in the initial state where the trigger 171 is not pulled, the screw 45 and the pin holding part 65 are disposed at the initial position (the most forward position). The user inserts the tip of the shaft part 811 of the pin 81 into the gap at the center of the front ends 654 of the plurality of holding claws 653 (the part protruding forward from the hole 621). At this time, the holding force of the holding claws 653 is such that the shaft part 811 can be held loosely. When the user pulls the trigger 171 to turn on the switch 172, the controller 20 (control circuit) starts the forward rotation drive of the motor 21 according to the set control conditions. The increased torque transmitted via the planetary reducer 31, the drive gear 321, and the driven gear 411 is transmitted to the nut 41.

[0116] As Figure 13 shown, as the nut 41 rotates, the screw 45 moves rearward, and the pin holding part 65 connected to the screw 45 also moves rearward. As the front ends 654 of the holding claws 653 enter the hole 621, the shaft part 811 of the pin 81 is firmly held by the holding claws 653 and is pulled rearward along the drive axis A1. Accordingly, as Figure 14As shown, the collar 85 also enters into the hole 621, and the flange 851 abuts against the front end face of the anvil 62. The collar 85 is deformed by being strongly pressed forward and radially inward by the anvil 62, and is firmly clamped between the head 815 of the pin 81 and the work object W, and is riveted to the shaft portion 811. In addition, a relatively strong load is required to rivet the collar 85 to the shaft portion 811. This load acts as a reaction force in the forward direction on the nut 41 via the pin holding portion 65, the connecting member 66, and the screw 45.

[0117] In contrast, in the present embodiment, the front receiving portion 51 (thrust bearing 511) allows the rotation of the nut 41 while receiving the reaction force in the forward direction from the nut 41, and transmits it to the connecting sleeve 63. On the other hand, the anvil 62 is pressed against the work object W via the collar 85 and receives a force in the backward direction. Therefore, the anvil 62 and the connecting sleeve 63 are integrally subjected to a force in the compressive direction from both ends in the axial direction (front-back direction).

[0118] When the collar 85 is riveted to the shaft portion 811 of the pin 81, the fastening of the work object W is completed. The controller 20 (control circuit) stops the forward rotation drive of the motor 21 at the moment when the riveting is completed, and stops the backward movement of the screw 45. In addition, the determination of the completion of riveting (that is, the stop control of the backward movement of the screw 45) can be performed by any known method. The controller 20 can determine the completion of riveting based on the driving state of the motor 21 (for example, the driving current of the motor 21, the rotational speed of the motor 21), for example. After stopping the forward rotation drive of the motor 21, the controller 20 reversely drives the motor 21 to move the screw 45 forward, thereby returning the screw 45 and the pin holding portion 65 to the initial positions.

[0119] As described above, since a relatively strong load is applied when the collar 85 is riveted to the pin 81, at the moment when the riveting is completed, the collar 85 is firmly crimped to the front end portion of the hole 621 of the anvil 62. Therefore, as Figure 15 shown, in order to move the pin holding portion 65 in the state of holding the shaft portion 811 forward and separate the collar 85 from the anvil 62, a relatively strong load is required. This load acts as a reaction force in the backward direction on the nut 41 via the pin holding portion 65, the connecting member 66, and the screw 45.

[0120] In the present embodiment, the rear receiving portion 53 disposed behind the driven gear 411 receives the reaction force in the backward direction acting on the nut 41 via the driven gear 411. More specifically, as Figure 16As shown, the rear end surface of the tooth root portion of the gear 411 presses against the thrust bearing 55 by a reaction force directed rearward. The thrust bearing 55 moves slightly rearward while compressing the elastic member 56 and abuts against the receiving member 54 (the front end surface of the main body 541). The receiving member 54 receives the reaction force transmitted via the rear end surface of the driven gear 411 and the thrust bearing 55. During this period, the thrust bearing 55 allows the nut 41 to rotate smoothly.

[0121] As described above, the receiving member 54 is connected to the front housing 11 together with the central housing 12 and the rear housing 13 by the screw 19 directly fastened to the front housing 11. Therefore, compared with the case where the receiving member 54 is connected to the central housing 12 or the rear housing 13 instead of the front housing 11, even when the receiving member 54 is subjected to a reaction force, the possibility that the connection between the front housing 11, the central housing 12, and the rear housing 13 becomes loose can be reduced.

[0122] During the process of the screw 45 and the pin holding portion 65 returning to the initial position, as the front end portion 654 of the holding claw 653 moves in and out of the hole 621 forward, the holding claw 653 moves radially outward. As Figure 17 shown, when the pin holding portion 65 returns to the initial position, the fastener 8 in the state where the collar 85 is riveted to the pin 81 can be disengaged from the holding claw 653.

[0123] When the screw 45 returns to the initial position, the controller 20 stops the reverse drive of the motor 21. In addition, the determination of whether it has returned to the initial position (i.e., the stop control of the forward movement of the screw 45) can be performed by any known method. Although the detailed description is omitted, the controller 20 determines whether the screw 45 has returned to the initial position based on the detection result of the position sensor 27 capable of detecting the position of the screw 45, for example, and can thus stop the reverse drive of the motor 21. For example, a Hall sensor capable of detecting the magnet 271 mounted on the screw 45 can be used as the position sensor 27.

[0124] In addition, although the detailed illustration is omitted, the user can, for example, hang the fastening tool 1 using a wire with one end fixed at the work site and having a mounting member at the other end, thereby being able to reduce the burden of continuously holding the fastening tool 1 in the same posture. On the other hand, depending on the configuration of the work object, the use posture of the fastening tool 1 changes. Therefore, the user can appropriately change the mounting position of the hook 145 as described above according to the actual use posture.

[0125] In addition, as needed, the user, as described above, by using the auxiliary handle 91 (refer to Figure 2)It is installed in the installation part 111. Thus, while holding the handle 17 with one hand and the auxiliary handle 91 with the other hand, it is possible to perform the fastening operation while firmly holding the fastening tool 1. Since the handle 17 and the auxiliary handle 91 are respectively arranged at the rear side and the front side of heavy objects such as the motor 21 and the drive mechanism 3, the user can stably operate the fastening tool 1.

[0126] The corresponding relationships between the structural elements of the above-described embodiment and the structural elements of the present invention are shown below. However, the structural elements of the embodiment are merely examples and do not limit the structural elements of the present invention. The fastening tool 1 is an example of a "fastening tool". The fastener 8, the pin 81, and the collar 85 are examples of a "fastener", a "pin", and a "tubular part", respectively. The tool body 10 is an example of a "tool body". The anvil 62 is an example of an "anvil". The drive axis A1 is an example of a "drive axis". The pin holding part 65 is an example of a "pin holding part". The motor 21 is an example of a "motor". The nut 41 is an example of a "rotating part". The screw 45 is an example of a "moving part". The driven gear 411 and the gear teeth 412 are examples of a "gear part" and "gear teeth", respectively. The receiving part 54 is an example of a "receiving part".

[0127] The thrust bearing 55 is an example of a "thrust bearing". The elastic member 56 is an example of an "elastic member". The front housing 11, the central housing 12, and the rear housing 13 are examples of a "first part", a "second part", and a "third part", respectively. The bearing 422 is an example of a "radial bearing".

[0128] In addition, the above-described embodiment is merely illustrative, and the fastening tool according to the present invention is not limited to the structure of the illustrated fastening tool 1. For example, the following changes can be made. In addition, only one or more of these changes can be used in combination with the fastening tool 1 shown in the embodiment or the inventions described in each technical solution.

[0129] For example, the fastening tool 1 can correspond to either a non-breaking type or a breaking type of multi-component riveted fastener by replacing the anvil 62 and the pin holding part 65 as described above. In addition, the fastening tool 1 can also correspond to known fasteners called blind rivets (or rivets) by replacing the anvil 62 and the pin holding part 65. A blind rivet is composed of a pin and a tubular part (also called a sleeve or a rivet body) formed integrally. Similar to the breaking type of multi-component riveted fastener, in the fastening process, the pin tail is broken off.

[0130] In addition, the fastening tool 1 may also be, for example, a dedicated device corresponding to only any one type of non-breaking multi-component riveted fasteners, breaking multi-component riveted fasteners, and blind rivets. In addition, compared with breaking multi-component riveted fasteners and blind rivets, when using non-breaking multi-component riveted fasteners, especially when the screw 45 moves forward, the backward reaction force acting on the nut 41 is relatively large. Therefore, the present invention is particularly applicable to fastening tools for fastening work objects by non-breaking multi-component riveted fasteners.

[0131] The shape, structural elements, and their connection methods of the tool body 10 can be appropriately changed. For example, the central housing 12 and the rear housing 13 can be changed into a single housing. For example, the entire outer housing 14 may not be formed by split bodies on the left and right, but a plurality of separately formed receiving bodies (such as box-shaped bodies and cylindrical bodies) are connected to each other by fixing members (such as screws).

[0132] Similarly, the handle 17 can also be separately formed from the tool body 10 and connected to the tool body 10 by a fixing member (such as a screw). In addition, the tool body 10 and the handle 17 do not need to integrally form a ring portion. For example, the handle 17 can be connected to the rear end portion of the tool body 10 extending in the front-rear direction in a cantilever shape. In this case, the lower end portion of the handle 17 can be configured to hold the battery 93 in a manner that allows the battery 93 to be removed. In addition, the arrangement of the handle 17 relative to the tool body 10 and the motor 21 is not limited to the examples of the above embodiments.

[0133] The structure and arrangement of the internal mechanism of the tool body 10 can be appropriately changed as follows, for example.

[0134] For example, the motor 21 can also be changed to a brushed motor, an AC motor, or an outer rotor type motor with a rotor arranged radially outside the stator. In addition, the motor 21 can also be arranged such that the rotation axis A2 of the motor shaft 213 intersects the drive axis A1.

[0135] In the drive mechanism 3, an feed screw mechanism having a nut and a screw directly engaged with the nut can be used instead of the ball screw mechanism 4. The types and arrangements of the bearings 421 and 422 supporting the nut 41 can also be appropriately changed.

[0136] The mechanism for transmitting power from the electric motor 21 to the ball screw mechanism 4 is not limited to the examples of the above-described embodiments. For example, the number of planetary gear mechanisms included in the planetary speed reducer 31 may be other than three. Instead of the planetary speed reducer 31, a gear speed reducer including a gear train other than the planetary gear mechanism may be disposed between the electric motor 21 and the ball screw mechanism 4. The idler gear 331 disposed between the driving gear 321 of the first intermediate shaft 32 and the driven gear 411 of the nut 41 may be omitted, and the driving gear 321 and the driven gear 411 may be directly meshed with each other.

[0137] The structural elements and arrangements of the front bearing portion 51 and the rear bearing portion 53 are not limited to the examples of the above-described embodiments.

[0138] For example, the thrust bearing 511 of the front bearing portion 51 may also have different types of rollers or balls as rolling elements. The same change may also be made to the thrust bearing 55 of the rear bearing portion 53.

[0139] As long as the bearing member 54 of the rear bearing portion 53 can receive the reaction force toward the rear through the rear surface of the driven gear 411, the shape, material, arrangement, connection method to the tool body 10, etc. can be appropriately changed. For example, the bearing member 54 may also be arranged to always contact the thrust bearing 55. In this case, the elastic member 56 may be omitted. In addition, a thrust washer may be used instead of the thrust bearing 55. The bearing member 54 may be formed of a metal other than iron. The bearing member 54 may be fixed to the front housing 11 independently of the central housing 12 and the rear housing 13. In addition, the bearing member 54 is preferably fixed to the front housing 11, but may also be fixed to the central housing 12 or the rear housing 13.

[0140] The shape, material, arrangement, etc. of the elastic member 56 can be appropriately changed as long as the elastic member 56 is sandwiched between the bearing member 54 and the thrust bearing 55 and can hold the bearing member 54 and the thrust bearing 55 in a state of being separated from each other in the front-rear direction in the initial state. For example, when the shape of the bearing member 54 is different from that of the above-described embodiment, the elastic member 56 may also be arranged between the bearing member 54 and the thrust bearing 55 so as to contact the bearing member 54 and the thrust bearing 55.

[0141] The battery holder 15 may also be disposed not on the battery holding portion 106 but on the front wall 104 side of the extension portion 103. Alternatively, the battery holder 15 may be omitted, and the tool body 10 (for example, the battery holding portion 106) has mounting portions for the battery 93 such as a guide rail 155 and a terminal block 157. That is, the battery 93 may be directly mounted on the tool body 10 without passing through the battery holder 15. In addition, the fastening tool 1 may be configured to operate using power supplied from an external AC power source instead of using the power supplied by the battery 93.

[0142] The controller 20 may also be disposed in the housing portion 101 or the battery holding portion 106 instead of being disposed in the extension portion 103. Similarly, the operation display unit 23 may not be provided on the rear wall 105 of the extension portion 103 but may be provided, for example, on the upper wall of the battery holding portion 106. In addition, the operation unit 231 may not be a push-button switch but may be a slide switch, a rotary dial, or a touch screen integrated with the display unit 233. Further, the operation display unit 23 may be omitted.

[0143] The structure and connection method of the head 16 may be appropriately changed. For example, the shape of the anvil 62 and the connection method of connecting to the tool body 10 via the connection sleeve 63 may also be changed. For example, the anvil 62 may be directly screwed to the tool body 10 (mounting portion 111) without passing through the connection sleeve 63. Similarly, the shape of the pin holding portion 65 and the connection method of connecting to the screw 45 via the connection member 66 may also be changed. For example, the pin holding portion 65 may be directly connected to the screw 45 without passing through the connection member 66. The pin holding portion 65 only needs to be configured to change the holding force of the plurality of holding claws 653 in association with the relative movement of the anvil 62 in the front-rear direction. For example, the shape, number, etc. of the holding claws 653 may be appropriately changed.

[0144] Moreover, in view of the gist of the present invention and the above-described embodiments, the following modes are constructed. At least one of the following modes can be used in combination with one or more of the above-described embodiments and their modified examples and the technical solutions described in each claim.

[0145] [Mode 1] The rear end of the reaction force receiving portion is located at a position closer to the front side than the rear end of the rotating member.

[0146] [Mode 2] The receiving member is connected to the first portion by a screw fastened to the first portion.

[0147] [Mode 3] The receiving member is disposed between the gear portion and the radial bearing in the front-rear direction.

[0148] [Mode 4] The first portion holds a radial bearing that rotatably supports the rotating member.

[0149] [Method 5] The fastening tool fastens a work object by using a non-breaking type fastener in which the pin does not break during fastening as the fastener.

Claims

1. A fastening tool configured to fasten a work object with a fastener having a pin and a cylindrical portion, characterized in that: it includes a tool body, an anvil, a pin gripping portion, a motor, a rotating member, a moving member, a gear portion, and a receiving member, wherein: the anvil is configured to engage with the cylindrical portion of the fastener and is connected to the tool body so as to extend along a driving axis in the front-rear direction of the fastening tool; the pin gripping portion is configured to grip the pin and is configured to move relative to the anvil along the driving axis; the motor is housed in the tool body; the rotating member is cylindrical and is supported by the tool body so as to be rotatable about the driving axis and is driven to rotate by the power of the motor; the moving member is configured to be connected to the pin gripping portion and is engaged with the rotating member, and moves along the driving axis by the rotational drive of the rotating member; the gear portion protrudes in a flange shape radially outward from the outer peripheral surface of the rotating member and has gear teeth on the outer periphery; the receiving member is disposed behind the gear portion, and the rear surface of the gear portion receives a rearward reaction force acting on the rotating member when the pin gripping portion moves forward.

2. The fastening tool according to claim 1, characterized in that: the receiving member is formed of iron or an alloy mainly composed of iron.

3. The fastening tool according to claim 2, characterized in that: it further has a thrust bearing disposed between the rear surface of the gear portion and the receiving member.

4. The fastening tool according to claim 3, characterized in that: the thrust bearing is disposed such that when no reaction force acts on the rotating member, the thrust bearing is separated from the receiving member in the front-rear direction, and when a reaction force acts on the rotating member, the thrust bearing contacts the receiving member.

5. The fastening tool according to claim 4, characterized in that: it further has an elastic member interposed between the receiving member and the thrust bearing in the front-rear direction.

6. The fastening tool according to any one of claims 1 to 5, characterized in that: the tool body includes at least a first portion and a second portion connected to each other in the front-rear direction, the receiving member is connected to the first portion, and the first portion is the portion disposed on the front side among the first portion and the second portion.

7. The fastening tool according to claim 6, characterized in that: the receiving member is disposed behind the second portion and is connected to the first portion together with the second portion.

8. The fastening tool according to claim 7, characterized in that: the tool body further includes a third portion for holding a radial bearing, wherein the radial bearing supports the rotating member so as to be rotatable, the third portion is disposed behind the receiving member and is connected to the first portion together with the receiving member and the second portion.

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