JPH0413102B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a nut runner used for tightening bolts and nuts.

[Conventional technology]

For example, as shown in FIG. 4, a disc wheel 2 of a wheel 1 of an automobile is fixed by a plurality of hub nuts 3 screwed at equidistant positions on the circumference. Since this differs depending on the vehicle model, nut runners that can tighten two types of hub nuts with different outer diameters are used in mixed vehicle production lines.

FIG. 5 shows a conventional nut runner of this type. In the drawing, 4 is a cylindrical housing 5
Nut runner main body 6 has a drive source such as an air motor built therein, and reference numeral 6 indicates a plurality of first nut runners supported rotatably by the drive source of nut runner main body 4 at equidistant positions on the circumference of front wall portion 7 of housing 5. This first socket 6 has a nut fitting part 8 at its tip. A plurality of second sockets 9 are detachably attached to the first socket 6, and each of the second sockets 9 has a nut having an inner diameter different from the nut fitting portion 8 of the first socket 6 at its tip. It has a fitting part 10, and a connecting shaft part 11 which fits into the nut fitting part 8 of the first socket 6 at the rear end.

Then, when tightening a hub nut with a large outer diameter, the first socket 6 is used to tighten the hub nut. In addition, when tightening a hub nut with a small outer diameter, attach the connecting shaft portion 1 of the second socket 9 to the nut fitting portion 8 of each first socket 6.
The second socket 9 is removably attached to the first socket 6 by manually fitting the sockets 1 and 1 individually by an operator, and a hub nut having a small outer diameter is tightened in the second socket 9. .

Other conventional nut runners include the one described in Japanese Utility Model Application Publication No. 188159/1988, which was proposed by the present applicant. This will be explained below with reference to FIGS. 6 and 7. In the drawing, 1
2 is a nut runner main body in which a drive source 14 such as an air motor is built in a housing 13 having double walls 13a and 13b; a drive shaft 14a of the drive source 14 is connected to the housing 13;
The drive gear 15 is rotatably supported on the outer wall 13a of the motor via a bearing 14, and a drive gear 15 is rotatably supported. 1
6 and 17 are double walls 13a and 13b of the housing 13
freely rotatable through bearings 18a and 18b,
In addition, both sockets 16, 16, 16, 16, 16, 16, 12, 14, 23, 22, 32, 32, 32, 42, 42, 44, 44, 34, 33, 44, 33, 4, 4, 3, 3, 3, 3, 3, 3, 4, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, , 4, , and 7 ins embodiments, with both sockets 16,
17 are alternately arranged at equal positions on the circumference. The fixed socket 16 and the movable socket 17 have nut fitting portions 19 and 20 having different inner diameters at their tips.
It also has driven gears 21 and 22 at its rear end, respectively. The movable socket 17 is configured to be extendable by slidably spline-fitting a cylindrical portion 24 having a flange 24a approximately in the center to the rotating shaft portion 23, and the movable socket 17 is extendable from the reference working position a of the fixed socket 16. It is possible to protrude and retract by a predetermined distance. The driven gears 21 and 22 of both the sockets 16 and 17 are respectively fitted to the drive gears 14a of the drive source 14 of the nut runner main body 12, and the drive source 14 simultaneously rotates the plurality of pairs of fixed sockets 16 and movable sockets 19. Power is given. 25 is the movable socket 17
This driving means 25 extends and contracts the brackets 26 on the inner wall 13b of the housing 13 at the center of each socket at equidistant positions on the circumference.
A hydraulic cylinder 27 for moving the socket is attached and fixed via the rod 27 of the hydraulic cylinder 27.
A push rod 28 spline-fitted with the outer wall 13a is attached to the tip of the push rod 28, and a
A disk 29 having gripping claws 29a is mounted at equidistant positions on the circumference. Then, the gripping claws 29a of the disk 29 are fitted into the flange portions 24a of each movable socket 17, and the rod 27 of the fluid pressure cylinder 27 is inserted.
The movable sockets 17 are extended and contracted all at once by the protruding and retracting movements of a.

When tightening the hub nut using the fixed socket 16, the fluid pressure cylinder 25 is operated to retract the rod 27a, and the movable socket 1
The nut fitting portion 20 of No. 7 is retracted rearward from the standard working position a of the fixed socket 16 and held at the retracted end position b. In this state, the fixed socket 16 is brought close to the hub nut, the nut fitting part 19 is fitted, and the drive source 14 of the nut runner body 12 is activated to rotate the fixed socket 16 in a predetermined direction and tighten the hub nut.

When tightening a hub nut using the movable socket 17, the hydraulic cylinder 27 is operated to expand and contract the rod 27a and push out the push rod 28. Then, the movable socket 17 expands and contracts all at once, and its nut fitting portion 20 projects forward from the standard working position a of the fixed socket 16 to the forward end position c.
is maintained. Thereafter, the nut fitting part 20 of the movable socket 17 is fitted close to the hub nut, and the drive source 14 of the nut runner body 12 is activated to rotate the movable socket 17 and tighten the hub nut.

[Problem to be solved by the invention]

According to the first conventional example of the nut runner, when tightening hub nuts having different outer diameters, the second socket 9 must be individually attached to the first socket 6 by an operator, There was a problem that the work was complicated and the workability was extremely poor.

Furthermore, according to the second conventional example of Natsutranna,
A fluid pressure cylinder 25 is required to move the movable socket 17, which increases the size, complicates the structure, and increases costs.

SUMMARY OF THE INVENTION An object of the present invention is to provide a nut runner that is capable of tightening two types of nuts, has good workability, and has a simple structure.

[Means to solve the problem]

The present invention has been proposed in order to achieve the above object, and includes a nut runner main body that has a drive source built into the casing, and a rearward biasing force that is constantly applied to the wall of the casing of the nut runner main body. a mounting shaft that is rotatably supported through the shaft so as to be movable back and forth in the axial direction, and has a plurality of mounting pieces extending radially in a circumferentially equidistant direction at its tip; and a wall of the casing of the nut runner main body, and , a plurality of fixed sockets that are rotatably supported by the drive source of the nut runner body at equidistant positions on the circumference of the mounting shaft and have nut fitting portions at their tips, and are fixed to the tips of the mounting pieces of the mounting shaft. Rotatably penetratingly supported in correspondence with the socket, having a nut fitting part at the tip having an inner diameter different from that of the nut fitting part of the fixed socket, and fitting with the nut fitting part of the fixed socket at the rear end. a plurality of movable sockets each having a connecting shaft portion, the movable sockets being retracted and held between the fixed sockets at a position rearward from the working position of the fixed socket by a biasing force acting on the mounting shaft. It is.

[Effect]

When a fixed socket is used, the movable socket is retracted and held between the fixed sockets and behind the working position of the fixed socket by the urging force acting on the mounting shaft. In addition, when using a movable socket, the movable socket is made to protrude forward from the fixed socket against the urging force acting on the mounting shaft, and then rotated around the mounting shaft to face the fixed socket. . Thereafter, the connecting shaft portion of the movable socket is fitted and fixed to the nut fitting portion of the fixed socket.

〔Example〕

The following is a first embodiment of the nut runner according to the present invention.
The explanation will be as follows with reference to FIGS. 3 to 3. In the drawing, 31 is a cylindrical housing 32
Nut runner body 33 has a built-in driving source such as an air motor, and 33 is a housing 32 of the nut runner body 31.
The mounting shaft 33 is rotatably supported through the front wall 32a of the casing 32 so as to be movable forward and backward in the axial direction.
A plurality of mounting pieces 34 extend radially in equidistant directions around the circumference.
While mounting and fixing the mounting board 34 having a,
A disc-shaped stop plate 35 is attached and fixed to the rear end held inside the housing 32. 36 is inserted into the mounting shaft 33 and is connected to the stop plate 35 and the housing 32.
A pressing spring 36 is compressed between the inner wall 32a of the mounting shaft 3 and the mounting shaft 3.
3 to constantly apply a backward biasing force. Reference numeral 37 designates a plurality of fixing sockets having a nut fitting part 40 formed at the tip of the shaft part 38 with a recess 39 into which a nut or the like is fitted. It is rotatably supported on the wall portion 32a by a built-in drive source,
Further, they are arranged at equidistant positions on the circumference around the mounting shaft 33. 41 is each mounting piece 34 of the above-mentioned mounting board 43
This movable socket 41 has a plurality of movable sockets rotatably penetrated and supported in correspondence with the fixed socket 37 at the distal end of the movable socket 41.
A connecting shaft part 44 which has a nut fitting part 43 formed with a recess 42 having an inner diameter different from the recess 39 of the fixing socket 37 at its rear end and which fits into the recess 39 of the fixed socket 37.
have. Then, the movable socket 41
is attached to the front surface of the fixed socket 37 by fitting and fixing the connecting shaft part 44 into the recess 39 of the nut fitting part 40 of the fixed socket 37 when in use, and when not in use from the working position of the fixed socket 37. At the rear,
Moreover, it is retracted and held between the fixed sockets 37.

Next, the handling procedure of the nut runner according to the present invention will be explained as follows. In addition, before using the nut runner, the movable socket 41
is attached to the front surface of the fixed socket 37 by fitting and fixing the connecting shaft part 44 into the recess 39 of the nut fitting part 40 of the fixed socket 37.

First, when tightening the hub nut using the fixed socket 37, press the mounting shaft 33 with the pressing spring 36.
After moving the movable socket 41 forward against the spring force and removing the connecting shaft 44 of the movable socket 41 from the recess 39 of the nut fitting part 40 of the fixed socket 37, The movable socket 41 is rotated around the center and held between the fixed sockets 37, and then the mounting shaft 33 is moved rearward, and the movable socket 41 is brought into contact with the outer surface of the front wall 32a of the housing 32 by the spring force of the pressing spring 36. in contact with and behind the working position of the fixed socket 37, and the fixed socket 37
Keep it in a safe place in between. In this state, the fixed socket 37 is brought close to the hub nut, the recess 39 of the nut fitting part 40 is fitted into the hub nut, and the drive source of the nut runner body 31 is activated to rotate the fixed socket 37 in a predetermined direction, and the hub nut is tightened. Tighten.

When tightening a hub nut using the movable socket 41, the mounting shaft 33, which has been retracted into the housing 32, is moved forward against the spring force of the pressing spring 36, and the movable socket 41 is used to tighten the fixed socket 37. After being held forward from the position, the movable socket 41 is rotated about the mounting shaft 33 to face the fixed socket 33. After that, move the mounting shaft 33 backward and attach each fixed socket 3.
The connecting shaft portion 44 of the movable socket 41 is inserted into the recess 39 of the nut fitting portion 40 of No. 7, and the fixed socket 3 is fixed.
A movable socket 41 is attached to the front surface of 7. At this time, the movable socket 41 is pressed against the pressing spring 36.
Since it is biased rearward by the spring force, it is securely fitted into the fixed socket 37. In this state, the movable socket 41 is brought close to the hub nut, and the recess 42 of the nut fitting portion 43 is inserted into the hub nut.
The drive source of the nut runner body 31 is activated to rotate the movable socket 41 in a predetermined direction, and the hub nut is tightened.

In the above embodiment, a four-shaft nut runner has been described, but the present invention is not limited thereto, and can be widely applied to multi-shaft nut runners.

[Effects of the Invention] According to the present invention, two types of nuts having different outer diameters can be tightened with one nut runner. Moreover, the movable socket can be easily and quickly and reliably attached to and detached from the fixed socket, greatly improving work efficiency, and the structure is simple, making it easy to manufacture.
Cost reduction can be achieved.

[Brief explanation of drawings]

Fig. 1 is a perspective explanatory view of the main part showing an embodiment of the nut runner according to the present invention, Fig. 2 is a perspective view of the main part showing the usage state of the fixed socket, and Fig. 3 is the main part showing the usage state of the movable socket. It is a perspective explanatory view. FIG. 4 is an explanatory diagram showing how to fix a disc wheel of an automobile wheel using a hub nut, FIG. 5 is a perspective explanatory diagram showing a first conventional example of a nut runner, and FIG.
7 and 7 show a second conventional example of a nut runner, FIG. 6 is an explanatory diagram showing the arrangement of a fixed socket and a movable socket, and FIG. 7 is an illustration of A of FIG. 6.
-A cross-sectional view. 31... Natsutranna main body, 32... Housing, 3
2a...Wall part, 33...Mounting shaft, 34a...Mounting piece, 37...Fixed socket, 40, 43...Nut fitting part, 41...Movable socket, 44...Connection shaft part.

Claims (1)

[Claims] 1. A nut runner main body having a built-in drive source in the casing, and a wall of the casing of the nut runner main body that can be rotated by constantly applying a backward biasing force, and
A mounting shaft is penetratingly supported so that it can move forward and backward in the axial direction, and has a plurality of mounting pieces extending radially in the circumferentially equidistant direction at the tip, and a wall of the casing of the nut runner main body, and the surrounding area at the time of installation. A plurality of fixing sockets are supported rotatably by the drive source of the nut runner body at equidistant positions on the circumference and have a nut fitting part at the tip, and a fixing socket is rotated in correspondence with the tip of the mounting piece of the mounting shaft. The nut-fitting portion has a nut-fitting portion having an inner diameter different from that of the nut-fitting portion of the fixed socket at the tip, and has a connecting shaft portion that fits with the nut-fitting portion of the fixed socket at the rear end. A nut runner comprising a plurality of movable sockets, the movable sockets being retracted and held behind the working position of the fixed sockets and between the fixed sockets by a biasing force acting on a mounting shaft.