JPH0732987B2 - Bolt / nut tightening machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a so-called constant torque bolt (a bolt having a tip end portion that is sheared when a constant torque is applied) and a nut screwed to the bolt. Regarding nut tightening machine.

[0002]

PRIOR ART AND PROBLEMS Applicants have previously proposed the bolt and nut tightening machine of US Pat. No. 4,403,529 for tightening constant torque bolts. Although this tightening machine is excellent in work efficiency, it has a disadvantage that it cannot be used in a place where there is not enough working space at the tightening place. Although a tightening machine using compressed air as a power source is also used, it has the same inconvenience as the above electric type.

Further, as shown in FIG. 6, the power-type tightening machine has one
Two output shafts (17) (1) (1) that are coaxially arranged and rotate in opposite directions from the input shaft (16a) through the differential reduction mechanism (16)
8), one output shaft (18) is fitted with an inner socket that should be fitted to the bolt tip, and the other output shaft (18)
(17) is equipped with an outer socket to be fitted with a nut screwed with the bolt.

The differential reduction mechanism 16 is generally constructed by combining planetary gear mechanisms in multiple stages, has a large number of parts, and has a complicated structure. Further, the size reduction of the differential speed reduction mechanism is greatly restricted from the viewpoint of processing and strength of parts, and thus there is a limit to the size reduction of the case accommodating the differential speed reduction mechanism. Further, as shown in FIGS. 6 and 7, the groove of the channel member (8) is
When performing the tightening work by inserting the head part (19) of the power type tightening machine (1) into the (81), the head part (19) is too large and the tightening machine is inserted into the groove (8) of the channel member (8). 81) can not be inserted,
Sometimes tightening work could not be done.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned inconvenience by a small bolt / nut tightening machine. That is, a bolt / nut tightening machine composed of the minimum required elements for fastening a constant torque bolt and a nut can be connected to a conventional power type bolt / nut tightening machine. The tightening machine of the present invention may be configured integrally with the conventional power type tightening machine, or may be detachably attached to the conventional power type tightening machine only when necessary.

[0006]

The tightening machine of the present invention is provided with a first output gear for an inner socket, which is rotatably provided in a housing, and is rotatably provided, coaxially with the first output gear. A second output gear for the outer socket and a first output socket for the inner socket that is rotatably arranged on an axis parallel to the axes of the first and second output gears and meshes with the first output gear. Of the input gear and a second input gear for the outer socket which is rotatably arranged coaxially with the first input gear and meshes with the second output gear for the outer socket. A shaft portion is concentrically projected on the second output gear to form a socket fitting portion at the tip of the shaft portion, and a shaft portion is concentrically projected on the first and second input gears. Then, at the tip of the shaft part, form an engaging part to be connected to the output shaft of the power tightening machine. It is.

[0007]

The operation of tightening the constant torque bolt by the tightening machine (2) of the present invention will be described. As shown in FIGS. 2 and 3, one end of the horizontal rod formed of the channel material (8) is closed by an end plate (82), and the end plate is brought into contact with the vertical rod (84) to attach the vertical rod and the end plate. To tighten the penetrated constant torque bolt (9) in the groove (81) of the horizontal rod, use the conventional power bolt and nut tightening machine (1) for the tightening machine (2) of the present invention. The case of performing will be described.

The power type bolt / nut tightening machine (1) has a case (11) containing a differential reduction mechanism (16) constructed by combining planetary gears in multiple stages, and a motor ( 10) are arranged in parallel, and both are connected by a handle (12) and an auxiliary handle (13).

A motor shaft (14) is connected to an input shaft (16a) of the planetary gear mechanism (16) via a bevel gear train (15), and one of two output shafts of the planetary gear mechanism (16) is connected. The output shaft (17) is connected to an outer socket, and the other output shaft (18) is connected to an inner socket that is concentrically arranged with the outer socket.

When using the power tightening machine (1) alone,
Bolt tip (91) in the inner socket and nut in the outer socket
Fit (92).

In the tightening machine (2) according to the present invention, the cylinder shaft (5
1) and the shaft body (61) are engaged with the outer socket and the inner socket attached to the known power tightening machine (1), respectively, and the power tightening machine
Connect (1) and tightening machine (2). Next, the nut (92) is fitted to the outer socket (40) of the tightening machine (2), and the bolt tip (91) is fitted to the inner socket (30).

The outer socket for driving the power tightening machine (1), the output gear (4) (6) reduction ratio and the inner socket input, output gear (3) (5) reduction ratio are all 1 and
Moreover, if there is no loss in the transmission of force, the moment of the reaction force generated in the tightening machine (2) is the same as the moment of the reaction force of the tightening machine (1), and the rotation direction is opposite.

In this way, if the reaction force moment generated in the tightening machine (2) and the reaction force moment of the power type tightening machine (1) have the same strength and the rotating direction is opposite, the tightening is performed. Machine (2) grip
When supporting (22) and the handle (13) of the power tightening machine (1), both hands are not rotated in the same direction.
Can be stably supported.

The grip (2) of the tightening machine (2) is constructed by arranging part of the housing (21) of the tightening machine (2) against the case (11) of the power-type tightening machine (1). Even if the worker does not support 22), it is possible to prevent the entire tightening machine from rotating.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, the tightening machine (2) of the present invention is
Inner socket output gear (3) in housing (21)
And the output gear (4) for the outer socket is coaxially and rotatably arranged.

Axial center B parallel to the axial center A of both output gears (3) and (4)
The upper socket input gear (5) that meshes with the inner socket output gear (3) and the outer socket input gear (6) that meshes with the outer socket output gear (4) are rotatably arranged on the top. To do.

A cylindrical shaft portion (42) is projected on the output gear (4) for the outer socket, and the outer socket (40) is provided at the tip of the shaft portion.
Removably fit.

A shaft portion (31) is provided so as to protrude from the shaft center of the output gear (3) for the inner socket. The shaft portion (31) is rotatably passed through the outer socket output gear (4) and a through hole (41) formed in the shaft center of the shaft portion (42). At the tip of the shaft (31),
Project the inner socket holding tube (32).

The inner socket holding cylinder (32) is provided with an inner socket (30) slidable inside the cylinder and rotatable integrally with the cylinder by, for example, spline engagement.

The inner socket (30) is urged in the pop-out direction by the spring (33) housed in the holding cylinder (32) and hits the retaining step (43) formed in the outer socket (40) to pop out. It has been stopped.

The outer socket (40) has a nut engaging portion (4
4) and the inner socket (30) is provided with a bolt tip engaging portion (34).

An ejector pin (7) is provided slidably in the axial direction, passing through the inner socket output gear (3) and its shaft portion (31). The ejector pin has a striking head portion (71) at the tip and a finger hook portion (72) at the base end.

The ejector pin (7) is urged by the spring (73) in the pop-out direction, and the hitting head (71) at the tip is made to protrude into the inner socket (30), and the grip portion at the base end. (72)
The recess (35) opened in the output gear (3) for the inner socket
Housed in.

The ejector pin (7) is a constant torque bolt.
This is for forcibly discharging the broken tip (91) of the bolt remaining in the inner socket (30) after fastening (9). That is, after breaking the bolt tip (91), pull the hook (72) with a finger to retract the ejector pin (7), and release the finger to release the spring.
It projects forward due to the restoring force of (73). As a result, the head (71) hits the chip, and the broken chip is discharged from the inner socket (30).

As shown in FIG. 5, a through hole (79) is formed in the inner socket output gear (3) and the shaft center of the shaft portion (31) thereof, through which the fractured tip (91) after bolting can pass. The breaking tip (91) can be provided and flowed out from the rear end opening of the through hole (79) to the recovery chamber (95) formed in the rear part of the tightening machine to be collected.

In this embodiment, each time the chip is broken,
It is not necessary to perform tip discharge operation, and bolts can be tightened continuously, so safety can be improved when working in high places. The ejector pin and the spring that biases the pin in the pop-out direction can be omitted. The fractured chips are once stored in the collection chamber (95), and the lid (94) of the collection chamber (95) is opened to collect them.

The inner socket input gear (5) has a cylindrical shaft (51) protruding from its axis. At the tip of the cylinder shaft (51),
An engaging portion (53) engageable with an outer socket fitted to an output shaft (17) of a known tightening machine (1) is formed.

A shaft body (61) penetrating the cylinder shaft (51) freely rotatably is provided at the axial center of the outer socket input gear (6), and the shaft body (61) has a well-known front end portion. An engaging portion (62) capable of engaging with the inner socket fitted to the output shaft (18) of the power tightening machine (1) is formed.

The housing (21) has a grip in a plane including the axis A of the output gears (3) and (4) and the axis B of the input gears (5) and (6).
(22) is protruding.

In the case of the tightening machine (2) of the present invention, as described above, the output gear (4) for the outer socket and the inner socket (30) are provided on the shaft center of the outer socket (40) and the inner socket (30). It has a simple shape with an output gear (3). Therefore, the pitch circle diameter can be reduced, and the required strength can be secured if the gear module is appropriate.
Therefore, the housing part that covers the output gears (3) and (4), that is,
Head (2) that covers the extension of the socket (30) (40) axis
1a) can be formed small.

FIG. 4 shows a tightening machine (2a) of another embodiment in which a plurality of idle gears (50) are provided between the output gear (3) for the inner socket and the input gear (5) for the inner socket. ),
It shows a state in which a plurality of idle gears (60) are respectively interposed between the outer socket output gear (4) and the outer socket input gear (6).

In this embodiment, as compared with the above-mentioned embodiments, the output shaft center A of the tightening machine (2a) is largely shifted in parallel with the output shaft of the power tightening machine (1) to transmit power. be able to. Therefore, even if the constant torque bolt to be tightened is located deep in the narrow space, the tightening work can be performed.

Although the tightening machine (2) is detachably attached to the power tightening machine (1) as needed, the power tightening machine (1) and the tightening machine (2) are combined. It can also be integrated as shown in FIG. In this case, one output shaft (17) of the power tightening machine (1) and the cylinder shaft (51) of the tightening machine (2) are integrated, and the other output shaft (18) and the shaft part (61) are combined. It should be integrated. Alternatively, power tightening machine
The case (11) of (1) and the housing (21) of the tightening machine (2) may be integrated.

That is, the drive unit and the output unit are housed in one housing, the drive unit includes the motor (10) and the differential reduction mechanism (16), and the output unit includes the output gear (3). Includes (4), input gears (5), (6), inner socket (30) and outer socket (40).

The present invention is not limited to the configuration of the above embodiment, and various modifications can be made within the scope of the claims.

[0036]

[Effects of the Invention] The housing (2) of the tightening machine (2) according to the present invention
1) is inner socket and outer socket (30) (40)
The output gears (3) and (4) for driving the motors are arranged coaxially, and the head portion (21a) accommodating the output gears (3) and (4) is formed smaller in accordance with the downsizing of the output gear. it can. Therefore, when the tightening machine is used alone as in the conventional case, it is possible to work in a narrow area where the extension of the socket of the tightening machine cannot be inserted.

[Brief description of drawings]

FIG. 1 is a sectional view of a tightening machine according to the present invention.

FIG. 2 is a front view showing a usage state of the tightening machine.

FIG. 3 is a right side view showing a usage state of the tightening machine.

FIG. 4 is a schematic view of another embodiment.

FIG. 5 is a sectional view of still another embodiment.

FIG. 6 is a front view of a conventional power tightening machine.

FIG. 7 is a side view of a conventional power tightening machine.

[Explanation of symbols]

 (1) Powered bolt and nut tightening machine (2) Bolt and nut tightening machine (3) Output gear for inner socket (4) Output gear for outer socket (5) Input gear for inner socket (6) For outer socket Input gear (17) Output shaft (18) Output shaft (21a) Head part (53) Engagement part (62) Engagement part

Claims (2)

[Claims] 1. A bolt / nut tightening machine for tightening a constant torque bolt having a nut screwed therein, comprising: a first output gear (3) for an inner socket rotatably arranged in a housing; The second output gear (4) for the outer socket, which is rotatably arranged coaxially with the first output gear (3), and the axis A of the first and second output gears (3) and (4) Parallel axis B
A first input gear (5) for the inner socket, which is rotatably arranged on the upper side and meshes with the first output gear, and rotatably arranged coaxially with the first input gear (5),
And a second input gear (6) for the outer socket that meshes with the second output gear (4) for the outer socket, wherein the first and second output gears (3) (4) are concentric circles, respectively. Shaft (3
1) (42) are projected, and the socket fitting part (34) (4
4) is formed, and the first and second input gears are concentrically provided with shaft portions (51) and (61), respectively, and the tip of the shaft portion should be connected to the output shaft of the power tightening machine. A bolt and nut tightening machine that forms the engaging parts (53) and (62). 2. A first output gear for an inner socket.
(3) and the shaft part (31) protruding from the output gear has a through hole (7
9. The bolt / nut tightening machine according to claim 1, wherein the broken tip generated by tightening the constant torque bolt is formed so as to be able to pass through the through hole and be discharged rearward.