JP2017159415A - Torque driver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technology for efficiently conducting screw fastening work that needs fastening at specified torque.SOLUTION: A torque driver 20 has a clutch mechanism for fastening a screw component at set torque. The torque driver 20 includes: a tool attachment part 23 for attaching a tip tool 24 at a tip side; and a connection part 30 for coaxially connecting with an output shaft of an electric rotary tool at a rear end side. The connection part 30 is provided behind a holding part 22. The connection part 30 is formed as a protruding part which is attached to the tool attachment part provided at the electric rotary tool.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a torque driver having a clutch mechanism.

  An electric rotary tool such as a drill driver attaches a tip tool such as a bit or a socket to an output shaft, and rotates the output shaft by a motor, thereby tightening screw parts such as screws, bolts, and nuts. The electric rotary tool has a clutch mechanism that cuts off power transmission to the output shaft when the tightening torque reaches a preset torque. In the electric rotary tool, the tightening torque of the screw component is adjusted by the clutch mechanism.

  The clutch mechanism is attached to, for example, a ring gear of a planetary gear mechanism, and includes a locking body that comes into contact with the ring gear and a locking projection that protrudes toward the locking body in the ring gear. The locking body is biased by a spring and engages with the locking projection. The load torque of the ring gear increases due to the rotation of the output shaft, and when the engagement between the locking body and the locking projection is released, the ring gear idles and power transmission to the output shaft is interrupted. It has become.

  Such an electric rotary tool includes a lock mechanism that locks the output shaft in a state where the operation switch is not operated (see, for example, Patent Document 1). This locking mechanism realizes a so-called “hand tightening” function, and an operator can use the electric rotary tool as a hand-driven driver. This hand tightening function is used when an operator manually tightens screws after screw tightening by motor rotation.

  Further, as a manual tool different from the electric rotary tool, a torque driver having a clutch mechanism that cuts off power transmission to an output shaft when a tightening torque reaches a preset torque is known. Torque drivers are widely used to tighten screw parts with a specified torque accurately. For example, Patent Document 2 discloses a torque fixed driver provided with a shaft coupling recess for detachably coupling an output shaft of an electric motor.

JP2015-113944A JP-A-11-285985

  The clutch mechanism of the electric rotary tool preferably cuts off the power transmission to the output shaft with a set torque. However, an external force accompanying the rotation of the component acts on the clutch mechanism while the motor is rotating. Therefore, power transmission may be interrupted before the actual tightening torque reaches or exceeds the set torque, making it difficult to use for screw tightening work that requires strict torque accuracy. .

  On the other hand, it is known that the torque accuracy of the torque driver is very high. Therefore, in screw tightening work that requires tightening with a specified torque, an operator uses a torque driver instead of an electric rotary tool. However, if the screw part is long, it will take much time, resulting in inefficient work.

  Therefore, in order to increase the work efficiency, a work form in which a screw part is temporarily tightened using an electric rotary tool and then the screw part is manually tightened manually using a torque driver has become widespread. According to this working mode, even a long screw part is fastened with an electric rotary tool, so that the working time can be shortened compared with working with a torque driver alone. However, the operator must change the tool to be used on the way, and it can not be denied that the operator feels troublesome.

  This invention is made | formed in view of such a condition, The objective is to provide the technique for performing efficiently the screw fastening operation | work which requires the tightening by a prescription | regulation torque.

  In order to solve the above-described problem, an aspect of the present invention relates to a torque driver having a clutch mechanism for tightening a tightening object with a set torque. This torque driver includes a tool mounting portion for mounting a tip tool on the front end side, and a connecting portion for coaxially connecting to the output shaft of the electric rotary tool on the rear end side.

  ADVANTAGE OF THE INVENTION According to this invention, the technique for performing efficiently the screw fastening operation | work which requires the clamping | tightening with a prescription | regulation torque can be provided.

It is an external appearance block diagram of an electric rotary tool. It is an external appearance block diagram of the torque driver of embodiment. It is a figure which shows the state which fixed the connection part of the torque driver to the tool mounting part of an electric rotary tool. (A), (b) is an external appearance block diagram of the torque driver of another embodiment. It is an external appearance block diagram of an electric rotary tool. It is an external appearance block diagram of the torque driver of another embodiment. It is a figure which shows the state which fixed the connection part of the torque driver to the tool mounting part of an electric rotary tool.

  FIG. 1 shows an external configuration of the electric rotary tool 1. The electric rotary tool 1 is a hand-held tool that an operator can hold with one hand. The electric rotary tool 1 may be a drill driver having a clutch mechanism that interrupts power transmission to the output shaft 6 when the tightening torque becomes a preset torque, but is another type of electric tool having a clutch mechanism. May be. The electric rotary tool 1 may be an electric tool having a shut-off function that stops the motor when the tightening torque reaches a preset torque.

  The housing constituting the exterior of the electric rotary tool 1 includes a bottomed cylindrical body 2 and a gripping part 3 extending downward from the body 2. The grip part 3 forms a grip to be gripped by an operator, and a battery pack 5 formed of a box-shaped storage case is attached to the lower end of the grip part 3. An operation switch 4 operated by an operator is formed on the front surface of the grip portion 3.

  The body 2 is provided with a motor that is a drive unit, a speed reduction mechanism that reduces the rotation of the motor, and an output shaft 6 that rotates at the reduced speed. A tool mounting portion 7 such as a chuck for mounting a tip tool 10 such as a driver bit is provided at the end of the output shaft 6. The clutch mechanism is attached to, for example, a ring gear of a planetary gear mechanism in a speed reduction mechanism, and includes a locking body that abuts the end surface of the ring gear in the axial direction, a locking projection that protrudes toward the locking body in the ring gear, And a clutch spring that biases the body against the ring gear. In the clutch mechanism, the load torque of the ring gear increases due to the rotation of the output shaft 6, and when the engagement between the locking body and the locking projection is released, the ring gear idles, Power transmission is cut off.

  The operator can set a torque value for interrupting power transmission. The load torque for releasing the engagement between the locking body and the locking projection in the clutch mechanism depends on the force with which the clutch spring biases the locking body. The operator can set a desired tightening torque by rotating a torque adjusting handle (not shown) to change the urging force of the clutch spring.

  Between the speed reduction mechanism and the output shaft 6, there is provided a lock mechanism for automatically locking the output shaft 6 during hand tightening work. The lock mechanism has a function of locking the output shaft 6 in a state where the operation switch 4 is not operated, and the operator can use the electric rotary tool 1 as a screwdriver by this lock function.

  Thus, the electric rotary tool 1 has a “clutch function” that interrupts power transmission to the output shaft 6 when the tightening torque reaches the set torque, and a “lock function that locks the output shaft 6 when the operation switch 4 is not operated. ”. When the lock function is activated, the clutch function is not activated. The clutch function and the lock function are substantially provided as standard in commercially available drill drivers.

  If the power transmission can be accurately interrupted with the set torque by the clutch function of the electric rotary tool 1, the operator's screw tightening operation becomes very easy. However, in the body portion 2 of the electric rotary tool 1, vibrations caused by various components rotating at high speed and vibrations from the output shaft 6 are transmitted to the clutch mechanism, so that the clutch mechanism has a torque set by the operator. The value may not work correctly. Therefore, in screw tightening that requires strict tightening torque accuracy, the operator cannot finish the work only by using the electric rotary tool 1, but temporarily tightens the screw parts using the electric rotary tool 1, and then It is changed to a torque driver and the screw parts are finally tightened manually. Thus, the operator must change the tool to be used, and it is difficult to say that the current screw tightening operation can be efficiently performed.

  Therefore, in the embodiment, a structure for attaching a torque driver having a highly accurate clutch function to the electric rotary tool 1 and rotating it coaxially with the output shaft 6 of the electric rotary tool 1 is provided.

  FIG. 2 shows an external configuration of the torque driver 20 of the embodiment. The torque driver 20 includes a driver main body 21, and the driver main body 21 has a gripping portion 22 for an operator to grip, and a tool mounting portion 23 for mounting a tip tool 24 such as a driver bit. The tool mounting portion 23 is provided on the tip side of the torque driver 20 and has a mounting hole into which the tip tool 24 is inserted.

  The torque driver 20 includes a clutch mechanism for tightening a screw component, which is a tightening target, with a set torque. The clutch mechanism includes, for example, a friction plate that connects the driver main body 21 and the tip tool 24, and a clutch spring that biases the friction plate in the meshing direction. In the clutch mechanism, when a torque of a predetermined value or more is applied to the tip tool 24 during tightening of the screw parts, the friction plate slips and the tip tool 24 and the driver main body 21 are idled.

  The torque value when the tip tool 24 and the driver main body 21 run idle can be changed by adjusting a torque value variable section provided in the driver main body 21. For example, the torque value variable portion is composed of a ring-shaped member that is rotatably provided on the outer periphery of the driver main body 21, and adjusts the spring force of the clutch spring that biases the friction plate by rotating the ring-shaped member. The torque value can be changed. Note that the torque driver 20 of the embodiment may not have the torque value variable function.

  According to the torque driver 20 of the embodiment, when the tightening torque by the tip tool 24 reaches a specified torque, the friction plate slips and the connecting portion between the tip tool 24 and the driver main body 21 idles, and the screw part is tightened. Stops. As a result, it is possible to accurately tighten the screw with the specified torque.

  The torque driver 20 according to the embodiment includes a connecting portion 30 for connecting coaxially to the output shaft 6 of the electric rotary tool 1 on the rear end side. The connecting portion 30 is provided behind the grip portion 22 and includes a protrusion that extends rearward from the rear end of the driver main body 21 coaxially with the rotation axis of the tip tool 24. The electric rotary tool 1 shown in FIG. 1 includes a tool mounting portion 7 for mounting a driver bit. The connecting portion 30 provided at the rear end of the torque driver 20 may have the same shape as the mounted shape of the tip tool 10 mounted on the tool mounting portion 7 of the electric rotary tool 1. For example, the cross section of the connection part 30 is formed in a polygon. By making the connecting portion 30 into a shape that can be attached to the tool mounting portion 7 of the electric rotary tool 1, the connecting portion 30 can be fixed to the tool mounting portion 7 of the electric rotary tool 1.

  FIG. 3 shows a state in which the connecting portion 30 of the torque driver 20 is fixed to the tool mounting portion 7 of the electric rotary tool 1. By fixing the connection part 30 to the tool mounting part 7, the output shaft 6 and the driver main body 21 of the electric rotary tool 1 can be rotated together. A state in which the torque driver 20 is connected to the electric rotary tool 1 is referred to as a “connected tool”. Hereinafter, a method of using the connecting tool will be described assuming that the specified tightening torque of the screw component is L (N · m).

  The torque driver 20 uses a dedicated tool having a tightening torque of L. When the torque driver 20 has a torque value variable function, the torque value variable unit is adjusted to set the tightening torque to the torque value L. On the other hand, the tightening torque of the electric rotary tool 1 is set to a torque value M (<L) lower than L. The torque value M is set in consideration of the maximum torque error of the clutch mechanism of the electric rotary tool 1. For example, if the maximum torque error of the clutch mechanism of the electric rotary tool 1 is 0.3 N · m, the torque value M is preferably set to a value slightly lower than (L−0.3) N · m. .

  In the screw tightening operation, when the operator grips the grip portion 3 and causes the tip tool 24 of the torque driver 20 to contact the screw component and operates the operation switch 4, the output shaft 6 and the torque driver 20 are integrated. Rotate. When the tightening is advanced and the load torque of the output shaft 6 reaches the torque value M, the clutch mechanism of the electric rotary tool 1 works and the power transmission to the output shaft 6 is interrupted. At this time, the tightening torque of the screw component may not be exactly the torque value M. At this time, the tightening torque has not reached the torque value L, and the screw tightening using the motor rotation of the electric rotary tool 1 is positioned as a temporary tightening operation of the screw component.

  Next, the operator removes his / her finger from the operation switch 4 and rotates the electric rotary tool 1 in the screw tightening direction. At this time, the output shaft 6 is fixed with respect to the electric rotary tool 1 by the lock function of the electric rotary tool 1, and therefore the connecting tool can be used as a hand driver having a clutch function by the torque driver 20. The operator rotates the connecting tool until the tip tool 24 and the driver main body 21 are idled. Manual screw tightening using a connecting tool constitutes the final tightening operation of the screw component. When the tip tool 24 and the driver main body 21 are idled, the tightening torque of the screw component is accurately the torque value L, and the operator finishes the screw tightening operation.

  Thus, according to the connecting tool, the operator can perform a temporary fastening operation and a final fastening operation of the screw parts. That is, the operator can efficiently perform the screw tightening operation using only the connecting tool without having to change the tool to be used. In the connecting tool, setting the set torque of the electric rotary tool 1 to be larger than the torque value L and ending the screw tightening operation when the clutch mechanism of the torque driver 20 is activated is also considered as an option of the work form. However, since it is assumed that the clutch accuracy of the torque driver 20 is lowered while the motor is rotated by the electric rotary tool 1, it is preferable to perform screw tightening in two stages of the temporary tightening operation and the final tightening operation as described above.

  FIG. 4A shows an external configuration of a torque driver 20a according to another embodiment. The torque driver 20 a includes a driver main body 21, and the driver main body 21 has a gripping portion 22 for an operator to grip and a tool mounting portion 23 for mounting a tip tool 24. The tool mounting portion 23 is provided on the tip side of the torque driver 20. The torque driver 20a includes a holding portion 31 for mounting the connecting portion 30a on the rear end side. The holding portion 31 has a mounting hole 32, and the mounting hole 32 may be formed coaxially with the rotation axis of the tip tool 24 and have the same internal structure as the tool mounting portion 7 of the electric rotary tool 1.

  FIG. 4B shows a state where the connecting portion 30 a is attached to the mounting hole 32 of the holding portion 31. The connecting portion 30a is a rod-like member that is coaxially connected to the output shaft 6 of the electric rotary tool 1, and is held by the holding portion 31 to form a protruding portion that extends rearward from the rear end of the driver main body 21. . The electric rotary tool 1 shown in FIG. 1 includes a tool mounting portion 7 for mounting a tip tool 10. The connecting portion 30 a attached to the rear end of the torque driver 20 may have the same shape as the attached shape of the tip tool 10 attached to the tool attaching portion 7. For example, the cross section of the connection part 30a is formed in a polygon. By attaching the connecting portion 30 a to the holding portion 31 of the torque driver 20, the connecting portion 30 a can be fixed to the tool mounting portion 7 of the electric rotary tool 1.

  In the torque driver 20a, the connecting portion 30a may be attached to the holding portion 31 only when the torque driver 20a is connected to the electric rotary tool 1 by making the rod-like connecting portion 30a detachable from the holding portion 31. Thus, when the torque driver 20a is used alone, the connecting portion 30a can be removed from the holding portion 31.

  FIG. 5 shows another example of the external configuration of the electric rotary tool 1a. The housing constituting the exterior of the electric rotary tool 1a includes a bottomed cylindrical body 2 and a gripping part 3 extending downward from the body 2. The grip part 3 forms a grip to be gripped by an operator, and a battery pack 5 formed of a box-shaped storage case is attached to the lower end of the grip part 3. An operation switch 4 operated by an operator is formed on the front surface of the grip portion 3.

  The electric rotating tool 1a is different from the electric rotating tool 1 shown in FIG. 1 in that the electric rotating tool 1a is a tool mounting portion having a square cross section for mounting a socket body to be mounted on the head of a hexagon bolt or a hexagon nut as an output shaft. 7a. The tool mounting portion 7a is also an output shaft.

  FIG. 6 shows an external configuration of a torque driver 20b according to still another embodiment. The torque driver 20 b includes a driver main body 21, and the driver main body 21 has a gripping portion 22 for an operator to grip and a tool mounting portion 23 for mounting a tip tool 24. The tool mounting portion 23 is provided on the tip side of the torque driver 20. The torque driver 20b includes a connecting portion 30b on the rear end side for connecting coaxially to the output shaft of the electric rotary tool 1a.

  The connecting portion 30b is formed having a recess for receiving the tool mounting portion 7a provided in the electric rotary tool 1a. The recess may have the same shape as the attached shape of the socket body that is mounted on the tool mounting portion 7a of the electric rotary tool 1a.

  FIG. 7 shows a state in which the connecting portion 30b of the torque driver 20b is fixed to the tool mounting portion 7a of the electric rotary tool 1a. By fixing the connecting portion 30b to the tool mounting portion 7a, the output shaft of the electric rotary tool 1a and the driver main body 21 can rotate together.

  Thus, by providing the connection part coaxially connected to the output shaft of the electric rotary tool at the rear end of the torque driver, the torque driver can be used as a tip tool of the electric rotary tool. The operator can efficiently perform the screw tightening work by using a connecting tool in which a torque driver is connected to the electric rotary tool.

  The outline of one embodiment of the present invention is as follows.

  The torque driver (20, 20a, 20b) according to an aspect of the present invention has a clutch mechanism for tightening an object to be tightened with a set torque. The torque driver is coaxially connected to the tool mounting portion (23) for mounting the tip tool (24) on the front end side and the output shaft (6) of the electric rotary tool (1, 1a) on the rear end side. And connecting portions (30, 30a, 30b).

  The torque driver is preferably provided with a grip portion (22) for a user to grip, and a connecting portion (30, 30a, 30b) is preferably provided behind the grip portion.

  The connecting portion (30, 30a) may have a protrusion that is attached to a tool attachment portion (7) provided in the electric rotary tool (1), and the protrusion may be detachable.

  The connection part (30b) may have a recess for receiving the tool mounting part (7a) provided in the electric rotary tool (1a).

  The present invention has been described based on the embodiments. This embodiment is an exemplification, and it will be understood by those skilled in the art that various modifications can be made to each component or combination of each processing process, and such modifications are within the scope of the present invention. .

DESCRIPTION OF SYMBOLS 1, 1a ... Electric rotary tool, 2 ... Body part, 3 ... Grasping part, 4 ... Operation switch, 6 ... Output shaft, 7, 7a ... Tool mounting part, 10 * ..Tip tool, 20, 20a, 20b ... Torque driver, 21 ... Driver body, 22 ... Holding part, 23 ... Tool mounting part, 24 ... Tip tool, 30, 30a, 30b ... Connection part, 31 ... Holding part, 32 ... Mounting hole.

Claims (5)

A torque driver having a clutch mechanism for tightening a tightening object with a set torque,
A tool mounting part for mounting a tip tool on the tip side;
A connecting portion for coaxially connecting to the output shaft of the electric rotary tool on the rear end side;
A torque driver comprising: With a gripping part for gripping,
The connecting part is provided behind the grip part,
The torque driver according to claim 1. The connecting portion includes a protrusion that is mounted on a tool mounting portion provided in the electric rotary tool.
The torque driver according to claim 1 or 2, wherein The protrusion is removable.
The torque driver according to claim 3. The connecting portion includes a recess for receiving a tool mounting portion provided in the electric rotary tool.
The torque driver according to claim 1 or 2, wherein

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