JPH0354853Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a rotary tightening tool equipped with a mechanism for preventing reaction force due to tightening torque generated when tightening a screw.

(Prior art and its problems) In a tightening tool such as an electric screwdriver that tightens screws such as bolts and nuts, when the tightening torque reaches a predetermined value, a reaction force is transmitted to the tool body and grips the body. This causes moderate fatigue to workers, making it difficult to work for long periods of time, and significantly reducing work efficiency. Furthermore, if the machine body is supported by an arm of a robot or the like, the arm may deform or interfere with the work.

For this reason, as described in Japanese Utility Model Publication No. 56-6296, for example, claws have been provided on the outer periphery of the tip of the fuselage in a horizontal direction, and these claws are used to secure adjacent bolts, nuts, etc. A tightening tool has been developed that is configured to come into contact with an object and receive a reaction force.

However, with a tightening tool having such a structure, since the claw pieces protrude from the machine body, there is a risk that it will get in the way when handling the tool, such as when working or carrying it around, making it impossible to perform smooth tightening work. Not only
If there is no fixed object that the claw touches, it will not be able to receive the reaction force, and when the claw touches a fixed object, a bending moment will be applied to the aircraft body using the point of contact as a fulcrum. This caused problems such as difficulty in tightening with high precision.

(Purpose of the invention) The present invention was created in view of the above problems, and it allows for smooth tightening work and eliminates the reaction force and rotational force within the machine body without causing the reaction force to be received by other objects. To provide a rotary tightening tool that cancels each other out and allows highly accurate tightening work to be performed over a long period of time.

(Structure of the device) In order to achieve the above object, the rotary tightening tool of the present invention, as shown in the drawings corresponding to the embodiments, is capable of starting from the tip of the device 1 by rotating a motor 2 disposed inside the device 1. In a rotary tightening tool that tightens a screw by rotating a protruding output shaft 3, a rotary shaft 4 that rotates concentrically with the output shaft 3 is protruded from the motor 2, and the rotary shaft 4 rotates. The rotation is transmitted through a suitable meshing gear mechanism 8 to a flywheel 6 disposed on the base end side of the machine body 1, and the flywheel 6 is configured to rotate in the opposite direction to the output shaft 3. .

(Function) When the output shaft 3 is rotated and the screw is tightened, the rotation of the rotary shaft 4 coaxial with the output shaft 3 is transmitted as rotation in the opposite direction to the flywheel 6 via the meshing gear mechanism 8. This counteracts the reaction force of the tightening torque that acts on the output shaft 3 due to the rotation of the output shaft 3.

(Explanation of Embodiments) The embodiments of the present invention will be explained with reference to the drawings.
is a cylindrical driver body, and a motor 2 is disposed and fixed in its hollow interior. The rotary shaft 4 is made to protrude downward from the body 1, and the rotating shaft 4 is made to protrude toward the base end side of the body 1.

Reference numeral 5 denotes a screw-fitting end formed at the tip of the output shaft 3.

Reference numeral 6 denotes a flywheel disposed inside the base end of the machine body 1, whose center shaft 7 is rotatably supported by the machine body 1, and a meshing gear mechanism 8 is connected between the lower end of the center shaft 7 and the upper end of the motor rotation shaft 4. They are connected by.

This meshing gear mechanism 8 is formed by meshing bevel gears 8a and 8b fixed to the rotating shaft 4 and the central shaft 7 with a bevel gear 8c rotatably supported on the inner circumferential wall of the body 1. Rotation in the opposite direction to the rotational direction of the rotating shaft 4 is transmitted to the flywheel 6.

Note that the meshing gear mechanism 8 may be configured by a combination of appropriate gears, without using such a bevel gear train.

With this configuration, when screwing the screw D into the screw hole C drilled in members A and B, the tip fitting part 5 of the output shaft 3 of the fuselage 1 is engaged with the groove of the screw head. When the motor 2 is driven with the
When the screws D are screwed together, the tightening torque for the members A and B increases, and when the screws D are completely screwed, a reaction force in the reverse direction acts on the output shaft 3 of the motor 2.

On the other hand, due to the rotation of the rotary shaft 4 coaxial with the output shaft 3, the flywheel 6
rotates in the opposite direction to the output shaft 3, and when the tightening torque increases, acts to apply a rotational force in the same direction to the output shaft 3, thereby canceling out the reaction force acting on the output shaft 3.

(Effects of the invention) As described above, according to the rotary tightening tool of the invention,
An output shaft 3 and a rotating shaft 4 which are coaxial by the motor 2
The flywheel 6 is connected to the rotary shaft 4 via a meshing gear mechanism 8, and the flywheel 6 is rotated in the opposite direction to the output shaft 3. As there are no protruding claws or the like on the outside of the machine body to receive the reaction force, work can be done smoothly and there is no need for a fixed object to receive the reaction force. Since the reaction force applied to the output shaft 3 can be canceled out, tightening work can be performed even in areas where there is no fixed object.Furthermore, the output shaft 3 and the rotating shaft 4 can be coaxially disposed to eliminate the reaction force. Since the counteracting action is performed, accurate tightening can be reliably performed without applying a bending moment or the like to the machine body 1 and without giving excessive fatigue to the worker.

[Brief explanation of the drawing]

The drawing is a partially longitudinal front view showing an embodiment of the present invention. 1... Aircraft, 2... Motor, 3... Output shaft, 4
...rotating shaft, 6... flywheel, 8... meshing gear mechanism.

Claims (1)

[Scope of utility model registration request] In a rotary tightening tool that tightens a screw by rotating an output shaft 3 protruding from the tip of the body 1 by the rotation of a motor 2 disposed inside the body 1, the motor 2 is provided with a motor 2 concentrically with the output shaft 3. A rotating shaft 4 that rotates integrally with the fuselage body 1 is provided protrudingly, and the rotation of the rotating shaft 4 is transmitted via an appropriate meshing gear machine 8 to a flywheel 6 disposed on the proximal end side of the body 1. A rotary tightening tool characterized in that it is configured to rotate in a direction opposite to the output shaft 3.