JPH0866874A - Bolt fastener - Google Patents

Abstract

PURPOSE: To facilitate the fastening of a bolt by connecting the epicyclic gear side of an epicyclic reduction gear mechanism to the flexible spline side of a harmonic drive reduction gear mechanism, and connecting the external sun gear side of the epicyclic reduction gear mechanism to the circular spline side of the harmonic drive reduction gear mechanism. CONSTITUTION: A circular spline 4 of a harmonic drive reduction gear mechanism rotates in the same direction as an input shaft 10 and rotates the external sun gear 3 of an epicyclic reduction gear mechanism via an output flange 12. This torque is transmitted to the internal sun gear 13 of the epicyclic reduction gear mechanism via the epicyclic gear 1 of the epicyclic reduction gear mechanism. At this point, the epicyclic gear 1 of the epicyclic reduction gear mechanism does not revolve around another gear, so the internal sun gear 13 of the epicyclic reduction gear mechanism rotates in the direction opposite to the external sun gear 3 of the epicyclic reduction gear mechanism and rotates an outer socket 17, thereby fastening a clamping bolt 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a torcia-type high-tensile bolt tightening machine for use in joints of steel frame structures.

[0002]

2. Description of the Related Art FIG. 3 and FIG. 4 show a conventional torcia type high-tension bolt tightening machine which is widely used mainly for tightening bolts of steel structure joints. In FIG. 3, the first-stage reduction gear 2 is installed in the casing 21 by using the electric motor 20.
3 and the second stage reduction gear 24, the first stage planetary gear reduction mechanism 25 and the second stage planetary gear reduction mechanism 26, and the third stage planetary gear reduction mechanism 27 in the casing 22 to provide a predetermined output. In the mechanism for obtaining the above, the weight of the first-stage planetary gear reduction mechanism 25 and the second-stage planetary gear reduction mechanism 26 becomes particularly heavy, and the weight of the torcia type high-tension bolt tightening machine body becomes considerably heavy.

FIG. 3 (Japanese Patent Laid-Open No. 58-10466) and FIG. 4 show the electric motor 3 in the casing 30 and the casing 31.
2, a first stage reduction gear 33 and a second stage reduction gear 34 are provided, and an input shaft 36 is connected to a harmonic drive reduction mechanism inside a casing 35. Further, the circular spline 37 of the harmonic drive speed reduction mechanism is connected to the planetary gear 3 of the planetary gear speed reduction mechanism via the casing 35.
9 and the flexspline 40 of the harmonic drive speed reduction mechanism is connected to the sun external gear 41 of the planetary gear speed reduction mechanism. In the mechanism for transmitting a predetermined output by the harmonic drive speed reduction mechanism and the planetary gear speed reduction mechanism, in particular, a mechanism that connects the circular spline 37 of the harmonic drive speed reduction mechanism to the planetary gear 39 of the planetary gear speed reduction mechanism via the casing 35. The strength of the casing 35 itself is required, and the weight is heavy, and the length of the body of the tightening machine for the torcia type high tension bolt is long, and the weight of the tightening machine body for the torcia type high tension bolt is considerably heavy.

Therefore, the tightening machine for the high-strength torcia type high-strength bolts and the M2, which have higher strength for the recent weight reduction of structures, have been developed.
The main body of the tightening machine for 7 types or more of large-diameter torcia type high-tensile bolts weighs 16 kg or more, and it is difficult to operate by hand. Especially in bolt tightening work in narrow spaces and high places, the heavy weight of the Torsia type high tension bolt tightening machine reduces workability and increases the risk of work, and the Torsia type high tension bolt tightening machine is lightened. There are enormous needs.

[0005]

DISCLOSURE OF THE INVENTION The present invention provides a compact, lightweight and highly manipulable torusia-type height for easily and manually tightening a torusia-type high-tensile bolt having a large diameter and high strength. A tightening machine for a tension bolt is provided.

[0006]

SUMMARY OF THE INVENTION The gist of the present invention is a bolt tightening machine having a planetary gear reduction mechanism and a harmonic drive reduction mechanism, and a planetary gear 1 side of the planetary gear reduction mechanism and a flexspline 2 side of the harmonic drive reduction mechanism. And the sun external gear 3 of the planetary gear speed reduction mechanism.
And a circular spline 4 side of the harmonic drive reduction mechanism are connected to each other.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to an embodiment shown in FIGS. An input shaft 10 connected by a first stage reduction gear 8 and a second stage reduction gear 9 provided in a casing 5 and a casing 6 on the output shaft side of the electric motor 7 is connected to a wave generator hub 11 of a harmonic drive reduction mechanism. Next, the circular spline 4 of the harmonic drive reduction mechanism is connected to the sun external gear 3 of the planetary gear reduction mechanism via the output flange 12, and the flexspline 2 of the harmonic drive reduction mechanism is connected to the companion flange 14, the casing 6 and the insert flange. It connects with the planetary gear 1 of the planetary gear reduction mechanism via 15. Further, the inner sun gear 13 of the planetary gear reduction mechanism is connected to the outer socket 17, and the planetary gear 1 of the planetary gear reduction mechanism is connected to the inner socket 19.

In the tightening operation of the torcia type high tension bolt, the tightening nut 16 is fitted in the outer socket 17, and the pin tail portion (cutting portion) 18 is fitted in the inner socket 19. Therefore, the rotational force of the electric motor 7 is interlocked with the tightening nut 16 via the harmonic drive speed reducing mechanism and the planetary gear speed reducing mechanism, whereby the tightening nut 16 is rotated. This tightening operation will be described in detail below.

The rotational force of the electric motor 7 is transmitted from the input shaft 10 to the harmonic drive reduction mechanism via the first reduction gear 8 and the second reduction gear 9. At this time, the harmonic drive reduction mechanism is stationary, the circular spline 4 of the harmonic drive reduction mechanism rotates in the same direction as the input shaft 10 (2 is in a stationary state (fixed)), and passes through the output flange 12. The sun external gear 3 of the planetary gear reduction mechanism is rotated. The rotational force of the sun external gear 3 of the planetary gear reduction mechanism is transmitted to the sun internal gear 13 of the planetary gear reduction mechanism via the planetary gear 1 of the planetary gear reduction mechanism. Since the planetary gear 1 of the planetary gear reduction mechanism does not revolve at this point, the sun inner gear 13 of the planetary gear reduction mechanism rotates in the opposite direction (clockwise) to the sun outer gear 3 of the planetary gear reduction mechanism, and the outer socket Rotate 17 (FIG. 2A) and tighten the tightening nut 16.

When a certain amount of tightening torque is obtained, the tightening nut 16 comes to rest. When the tightening nut 16 comes to rest, the sun internal gear 13 of the planetary gear reduction mechanism connected to the tightening nut 16 also comes to rest, so that the planetary gear 1 of the planetary gear reduction mechanism that has been stationary until now rotates while rotating. The sun outer gear 3 of the mechanism is revolved in the same direction (counterclockwise) as the sun outer gear 3 of the planetary gear reduction mechanism, and the inner socket 19 connected to the planetary gear 1 of the planetary gear reduction mechanism rotates (FIG. 2). (B)). Tightening nut 16
Since the pin tail part (cutting part) 18 fitted to the inner socket 19 rotates counterclockwise while the screw is stationary, the tightening nut 16 and the pin tail part (cutting part) 18 are further tightened to reach the specified tightening torque. Then, the pin tail portion (cutting portion) 18 is broken, and the work of tightening the high tension bolt is completed.

In the present invention, the circular spline 4 of the harmonic drive reduction mechanism rotates in the same direction as the input shaft 10 and rotates the sun external gear 3 via the output flange 12, but the strength of the output flange 12 is compensated. As a result, the casing 6 can be made thin, and thus the overall weight can be reduced.

For example, the weight of the M27 type F10T torcia type high-tension bolt tightening machine is 16 kg or more, whereas the weight of the machine of the present invention is 12 kg, which is 4 kg or more. Was achieved. Therefore, M24 type F1 which has been widely popular due to its lightness
Single unit weight of 0T torcia type high tension bolt tightening machine 1
We were able to achieve a size and weight reduction equivalent to 2 kg. In addition, although higher strength bolts are being developed to reduce the weight of structures, the M24 type F15T torcia type high tension bolt tightening machine is a high torque tightening machine with sufficient tightening torque. We were able to achieve a unit weight of 12kg, which is the same level as conventional products. The application of the present invention is not limited to the tightening machine for torcia-type high-tensile bolts, but by applying it to a conventional product, it is possible to achieve further reduction in size and weight of the conventional product.

[0013]

According to the present invention, since the casing is made thin by compensating the output flange of the harmonic drive mechanism, the size of the casing can be reduced, and bolts can be tightened that are small in size and lightweight and have high operability. This tendency is made possible from the viewpoint of tightening work, and it makes a great contribution to the technological progress of the building industry.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention.

2A and 2B are explanatory views of the operation of the present invention.

FIG. 3 is a sectional view of a conventional example.

FIG. 4 is a sectional view of another conventional example.

[Explanation of symbols]

 1 Planetary Gear 2 Flex Spline 3 Sun External Gear 4 Circular Spline 5 Casing 6 Casing 7 Electric Motor 8 First Stage Reduction Gear 9 Second Stage Reduction Gear 10 Input Shaft 11 Wave Generator Hub 12 Output Flange 13 Sun Internal Gear 14 Companion Flange 15 Insert Flange 16 Tightening nut 17 Outer socket 18 Pin tail part (cutting part) 19 Inner socket 20 Electric motor 21 Casing 22 Casing 23 First stage reduction gear 24 Second stage reduction gear 25 First stage planetary gear mechanism 26 Second stage planetary gear mechanism 27 Third stage planetary gear mechanism 30 Casing 31 Casing 32 Electric motor 33 First stage reduction gear 34 Second stage reduction gear 35 Casing 36 Input shaft 37 Circular spline 38 Casing 39 Planetary gear 40 Flex Line 41 sun outer gear

Claims (1)

[Claims] 1. A bolt tightening machine having a planetary gear reduction mechanism and a harmonic drive reduction mechanism, wherein the planetary gear 1 side of the planetary gear reduction mechanism and the flexspline 2 side of the harmonic drive reduction mechanism are connected to each other, and the sun of the planetary gear reduction mechanism is connected. A bolt tightening machine characterized in that the external gear 3 side and the circular spline 4 side of the harmonic drive reduction mechanism are connected.