JPH04289035A - multi nutrunner - Google Patents

Abstract

PURPOSE:To provide a multi-nut runner with which the number of tightening drive shafts arranged on the same circumference and pitches between respective tightening drive shafts can be changed respectively independently and efficiently, and bolts, nuts, and the like having a plurality of kinds of pitch circle radius and the number can be tightened. CONSTITUTION:It is provided with a plurality of tightening drive shafts 5 arranged at equal intervals in the circumferential direction around a center shaft C on a base table 1, and a specified tightening drive shaft 6 capable of advancing and retreating in the radial direction provided so as to face to the position between a set of tightening drive shafts 5a, 5a among the tightening drive shafts 5. The shafts 5 are movably provided in the circumferential direction and in the radial direction, and moved in the circumferential direction cooperating with advancing and retreating movement of the shaft 6 between the position on which the shafts 5 only are arranged on the pitch circle X at equal intervals and the position on which they are arranged together with the shaft 6 on the pitch circle X. The shafts 5 are mutually engaged through cam plates 9R, 9L, 39 so as to cooperatively move in the radial direction independently from the movement in the circumferential direction.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention comprises a plurality of tightening drive shafts arranged at intervals in the circumferential direction, and the number of tightening drive shafts involved in the tightening operation and the This invention relates to a multi-nut runner with variable pitch between attached drive shafts.

0002

2. Description of the Related Art Conventionally, this type of multi-nut runner is known, for example, as disclosed in Japanese Patent Publication No. 63-27131.

This multi-nut runner is for tightening a plurality of hub nuts of an automobile, and has, for example, five tightening drive shafts arranged circumferentially at equal intervals along a circumference of a predetermined radius. At the same time, the four tightening drive shafts excluding one of the tightening drive shafts can each revolve around a revolving axis provided outside and parallel to each tightening drive shaft. By rotating the four tightening drive shafts at a predetermined angle around each revolution axis, the four tightening drive shafts can be rotated along a circumference with a radius different from the radius of the circumference. They are arranged at equal intervals in the circumferential direction.

[0004] In this multi-nut runner, with five tightening drive shafts arranged on the same circumference, five hub nuts each having a pitch circle radius corresponding to the radius of the circumference are arranged. The four hub nuts are tightened simultaneously by the tightening drive shafts, and with the four tightening drive shafts arranged on the same circumference, four hub nuts having a pitch circle radius corresponding to the radius of the circumference are attached. Each tightening drive shaft is used to simultaneously tighten the hub nut, thereby making the number of tightening drive shafts involved in tightening the hub nut variable and the radius of the pitch circle variable.

On the other hand, in automobiles, even if the car models are different, the pitch circle radius of the hub nuts may be the same and the number of hub nuts may be different, or the number of hub nuts may be the same and the pitch circle radius may be different. It may be different.

However, in the multi-nut runner described above, when the number of tightening drive shafts is changed, the pitch circle radius is also changed at the same time, so there is an inconvenience that the above-mentioned case cannot be handled. Ta.

[0007]

Problem to be Solved by the Invention The present invention solves this inconvenience by independently controlling the number of a plurality of tightening drive shafts arranged on the same circumference and the pitch between each tightening drive shaft. Another object of the present invention is to provide a multi-nut runner that can be changed efficiently and that can tighten nuts, bolts, etc. having a plurality of pitch radiuses and a plurality of numbers.

[0008]

[Means for Solving the Problems] In order to achieve the above object, the present invention is arranged on a base at intervals in the circumferential direction and is movable in the circumferential direction, and A plurality of tightening drive shafts provided to be movable in the radial direction toward the center of the circumference, and a position between a pair of tightening drive shafts adjacent to each other in the circumferential direction among the tightening drive shafts. and a specific tightening drive shaft provided so as to be able to move forward and backward in the radial direction,
The tightening drive shaft is configured such that when the specific tightening drive shaft is advanced to a position between the set of tightening drive shafts, the plurality of tightening drive shafts and the specific tightening drive shaft move in the circumferential direction. a first arrangement position arranged at a predetermined interval according to the number of these;
When the specific tightening drive shaft is retracted from the position between the set of tightening drive shafts, only the plurality of tightening drive shafts are arranged in the circumferential direction at a predetermined interval corresponding to the number of the tightening drive shafts. The second array position is provided so as to be movable in the circumferential direction in cooperation with the forward and backward movement of the specific tightening drive shaft, and further movable in the radial direction in cooperation with the second arrangement position. It is characterized by being engaged.

[0009]

[Operation] According to the present invention, if the specific tightening drive shaft is retracted from the position between the set of tightening drive shafts, only the plurality of tightening drive shafts are arranged on the same circumference. Arranged at the second arrangement position, it becomes possible to arrange the same number of nuts, bolts, etc. on the same circumference and tighten them via the respective tightening drive shafts. In this state, if each tightening drive shaft is moved in the radial direction of the circumference in cooperation, the pitch circle radius of each tightening drive shaft is changed, and the same number of nuts as the tightening drive shaft are moved. It becomes possible to tighten bolts, bolts, etc. with multiple types of pitch circle radii.

Further, when the specific tightening drive shaft is advanced to a position between the pair of tightening drive shafts, the tightening drive shaft cooperates with the advancement of the specific tightening drive shaft to The tightening drive shaft and the specific tightening drive shaft are finally arranged on the same circumference by moving in the circumferential direction to the first arrangement position, and the specific tightening drive shaft is added to the tightening drive shaft. It becomes possible to arrange the same number of nuts, bolts, etc. on the same circumference and tighten them via each tightening drive shaft. In this state, if each tightening drive shaft and the specific tightening drive shaft are moved in the radial direction, the pitch circle radius of each tightening drive shaft is changed.

[0011]

[Example] Fig. 1 shows an example of the multi-nut runner of the present invention.
This will be explained with reference to FIGS.

FIG. 1 is a front view of the multi-nut runner;
FIG. 2 is a sectional view taken along the line II--II in FIG. 1, and FIGS. 3 to 5 are explanatory diagrams of its operation.

In FIGS. 1 and 2, 1 is an annular base fixed to the tip of the case-shaped main body 2 of the multi-nut runner, and 3 is supported on the annular base 1 so as to be movable in the circumferential direction thereof. A plurality of circumferentially moving parts 4 are provided in each circumferentially moving part 3 so as to be movable in the radial direction toward the central axis C of the annular base 1, and 5 is each radially moving part. Center axis C in part 4
A tightening drive shaft 6 is supported in a position parallel to the tightening drive shaft 5, and is moved toward a position between a pair of tightening drive shafts 5a, 5a adjacent to each other in the circumferential direction of the annular base 1. A specific tightening drive shaft provided to be able to move forward and backward in the radial direction of the annular base 1 from the outside of the annular base 1; 7 is an advancing/retracting means for moving the specific tightening drive shaft 6 forward and backward; 8 is a specific tightening drive shaft Circumferential moving means 9 moves each circumferential moving part 3 in the circumferential direction of the annular base 1 by cooperating with the forward and backward movement of 6, and 9 moves each radial moving part 4 in cooperation with the annular base 1 It is a radial direction moving means for moving in the radial direction.

In this case, as shown in FIG. 1, for example, four circumferential moving parts 3, four radial moving parts 4, and four tightening drive shafts 5 are provided. are arranged at equal intervals. Each tightening drive shaft 5 is located inside the annular base 1 at a position where the distance from the central axis C is the same distance R, that is, the radius R (hereinafter referred to as pitch) centered on the central axis C. Pitch circumference X of circle radius R)
is placed on top.

As shown in FIGS. 1 and 2, each circumferentially moving section 3 is engaged with the inner and outer peripheral edges of the annular base 1 via a pair of guide rollers 10, 10, respectively. By rolling the guide rollers 10 on the inner and outer peripheral edges of the annular base 1, it is possible to move freely on the annular base 1 in the circumferential direction. A guide rail 11 extending in the radial direction toward the central axis C is laid on each circumferentially moving part 3, and each of the radially moving parts 4 is placed on this guide rail 11. It is supported so that it can move freely along the line. With this configuration, each radial moving section 4 can freely move in the radial direction on the circumferential moving section 3 toward the central axis C, and can also move in the circumferential direction integrally with the circumferential moving section 3. It is said that

Each tightening drive shaft 5 is rotatably supported via a bearing 12 at the tip of each circumferentially moving section 3 near the center axis C, and with this configuration, the radially moving section 3 4, and is also movable in the circumferential direction together with the radial moving section 4 and the circumferential moving section 3.

In this case, as shown in FIG. 2, each tightening drive shaft 5 passes from the tip of the main body 2 to the center axis C toward the front of the main body 2 through the inside of the annular base 1. A tightening socket 13 is concentrically attached to the distal end thereof. The rear end of each tightening drive shaft 5 is
A constant velocity joint 14 and a rotation transmission shaft 1 are installed inside the main body 2.
It is connected to a drive motor (not shown) via 5 etc.
The tightening socket 13 is transmitted by transmitting rotational driving force from the drive motor via the rotation transmission shaft 15 and the constant velocity joint 14.
It is rotated with.

As shown in FIG. 1, among the tightening drive shafts 5,
In the figure, a cutting portion 1a is formed in the annular base 1 at a location between the upper left and right pair of tightening drive shafts 5a, 5a, the radial moving portions 4a, 4a, and the circumferential moving portions 3a, 3a. As shown in FIG. 2, at the cut point 1a, a guide rail 16 is installed at the tip of the main body 2 and extends radially toward the central axis c.
6, a first movable base 17 is supported so as to be movable in the radial direction toward the central axis C.

A guide rail 18 extending radially toward the center axis C is installed on the first movable base 17 at the front part near the center axis C. A second movable base 19 is supported on the top so as to be movable in the radial direction toward the central axis C.

The specific tightening drive shaft 6 is rotatably supported at the tip of the second movable base 19 via a bearing 19a outside the pitch circumference X, and with this configuration, The first movable base 17 and the second movable base 19 are integrally movable in the radial direction toward the position between the tightening drive shafts 5a, 5a, and the second movable base 19 is integrally movable. It is said that it can freely advance and retreat in the radial direction toward the central axis C.

In this case, as shown in FIG. 2, the specific tightening drive shaft 6 extends parallel to each of the tightening drive shafts 5, and has a groove at its tip, similar to the tightening drive shaft 5. , tightening socket 13
are mounted concentrically. Then, the specific tightening drive shaft 6
Like the tightening drive shaft 5, it is rotated together with the tightening socket 13 by transmitting rotational driving force from a drive motor (not shown) via the rotation transmission shaft 15 and the constant velocity joint 14. There is.

As shown in FIGS. 1 and 2, the advancing/retracting means 7 includes a first advancing/retracting cylinder 20 fixed to the rear of the first movable base 17 and a second movable base 19 fixed to the rear of the first movable base 17. A second forward and backward movement cylinder 21 is provided, and these cylinders are arranged facing outward in the radial direction.

The first forward/backward moving cylinder 20 has its piston rod 20a moved from the main body 2 to the first movable base 17.
is coupled to a coupling portion 22 extending toward the rear end of the
By expanding and contracting the piston rod 20a, the first
The moving base 17 is connected to the second moving base 19 and the specific tightening drive shaft 6.
At the same time, it is moved forward and backward in the radial direction along the guide rail 16.

[0024] Further, the second forward-retracting cylinder 21 has its piston rod 21a connected to a connecting portion 23 extending from the first moving base 17 toward the rear end of the second moving base 19. By expanding and contracting the piston rod 21a, the second movable base 19 is moved forward and backward in the radial direction along the guide rail 18 together with the specific tightening drive shaft 6.

In this case, in the state shown by the solid line in FIG.
are both in a shortened state, and when the piston rod 20a of the first advance/retreat cylinder 20 is extended from this state, the first movement base is moved to a position where the specific tightening drive shaft 6 reaches the pitch circumference X. The base 17 is advanced together with the second movable base 19 and the specific tightening drive shaft 6, and from this advanced state, the piston rod 21a of the second forward/backward movement cylinder 21 is moved forward.
When is extended, the second movable base 19 is advanced together with the specific tightening drive shaft 6 to a position where the specific tightening drive shaft 6 approaches the center axis C from above the pitch circumference X, as will be described later. .

The specific tightening drive shaft 6 is formed to be extendable and retractable at its intermediate portion, and a cylinder 24 for expanding and contracting the specific tightening drive shaft 6 is attached to the side of the second advancing/retracting cylinder 21. It is fixed in a position parallel to 6. This cylinder 24 has its piston rod 2 as shown in FIG.
4a is coupled to the specific tightening drive shaft 6 via the coupling portion 25, and by expanding and contracting the piston rod 24a, the specific tightening drive shaft 6 is expanded and contracted.

As shown in FIG. 1, the circumferential moving means 8 moves the first movable base 17, the circumferential moving section 3a on the upper right in the drawing, and the circumferential moving section 3b on the lower right in the drawing from each other. Concatenated to
The engaging link group 8R, the first movable base 17, the upper left circumferential moving part 3a in the figure, and the lower left circumferential moving part 3 in the figure
These link groups 8R and 8L are arranged on both sides of the first movable base 17 and the specific tightening drive shaft 6, etc., and are symmetrical and identical. It is said to be composed of

That is, as shown in FIG. 3, for example, the right link group 8R includes an arm piece 26 extending laterally from the right side of the first movable base 17, and an arm piece 26 extending in the circumferential direction at the upper right. A swinging piece 27 swingably extends from the side of the portion 3a on the first movable base 17 side, and a swinging piece 27 is bent into a substantially dogleg shape connecting the arm piece 26 and the swinging piece 27. It includes a first link piece 28 and a second link piece 29 that connects the circumferentially moving part 3a and the lower right circumferentially moving part 3b.

In this case, one end of the first link piece 28 is pivotally supported on a support shaft 26a provided at the tip of the arm piece 26 through a long hole 28a, and the other end is supported on the swing piece 27.
, and is further rotatably supported on the main body 2 via a support shaft 30 at a bending point in the middle thereof.

The second link piece 29 extends in the circumferential direction of the annular base 1 between the circumferentially moving parts 3a and 3b, and is formed in a semicircular arc shape, and one end thereof extends in the circumferential direction. Moving part 3
a, and the other end is pivotally supported on a support shaft 31 provided on the side of the circumferentially moving portion 3b via a long hole 29a extending in the circumferential direction.

Similarly to the right link group 8R, the left link group 8L also has an arm piece 26, a swing piece 27,
It includes a first link piece 28 and a second link piece 29, which interconnect and engage the first movable base 17, the upper left circumferential moving part 3a, and the lower left circumferential moving part 3b.

Although the details of these link groups 8R and 8L will be described later, the first movable base 17 is advanced toward the center axis C until the specific tightening drive shaft 6 reaches the pitch circumference X. When the arm piece 26, the first link piece 28, and the swing piece 27 are used, the right circumferentially moving part 3a and the left circumferentially moving part 3a are moved clockwise and counterclockwise by a predetermined amount in the figure, respectively. , in the circumferential direction, and further move the right circumferential moving part 3b and the left circumferential moving part 3b in the circumferential direction by a predetermined amount clockwise and counterclockwise in the figure, respectively, via the second link piece 29. As a result, when the specific tightening drive shaft 6 reaches the pitch circumference X, each tightening drive shaft 5
are moved together with the specific tightening drive shaft 6 to positions arranged at equal intervals on the pitch circumference X.

Note that the lower right and lower left circumferential moving parts 3b, 3
The circumferentially moving portions 3b are provided on both sides of b.
A pair of stoppers 32a, 32b for regulating the movement position in the circumferential direction are fixedly installed on the annular base 1. It is said that it can be moved freely. In this case, in a state where the four tightening drive shafts 5 are arranged at equal intervals on the pitch circumference
When the tightening drive shaft 5 and the specific tightening drive shaft 6 are arranged at equal intervals on the pitch circumference X, they come into contact with the other stopper 32b.

As shown in FIG. 1, the radial moving means 9 has an arcuate shape extending along the annular base 1 from above the upper right radial moving part 4a to above the lower right radial moving part 4b. A cam plate 9R, and a radial moving part 4 from the upper left radial moving part 4a to the lower left symmetrically with the cam plate 9R.
an arc-shaped cam plate 9L extending over the annular base 1 and a mounting portion extending from the main body 1 at a position facing the specific tightening drive shaft 6 on the outside of the annular base 1; 3
Pitch change cylinder 3 fixedly installed at 3 toward central axis C
4.

Each of the cam plates 9R, 9L has a plurality of guide rollers 35 in contact with and engaged with its inner and outer peripheral edges, and is guided by these guide rollers 35 and is movable in the circumferential direction. There is.

In this case, these guide rollers 35
is rotatably attached to a bracket (not shown) provided on the main body 2 or the annular base 1, and each cam plate 9R, 9L is attached to the main body 2 or the annular base 1 via the guide roller 35. 1 is supported.

As shown in FIG. 4, each cam plate 9R,
9L includes right and left radial moving parts 4a,
Cam grooves 36a and 36b are formed in curved shapes extending in the substantially circumferential direction at locations corresponding to the radial moving portions 4a and 4b, respectively.
, 4b are fitted with protruding pins 37, 37.

These cam grooves 36a, 36b move the respective radially moving parts 4a, 4b toward the central axis C together with the tightening drive shafts 5a, 5b when the respective cam plates 9R, 9L are moved in the circumferential direction. pins 37,3 to move radially
For example, in FIG. 1, each cam plate 9R, 9
When L is moved counterclockwise and clockwise, respectively, tighten the respective radial moving parts 4a, 4b and tighten the drive shafts 5a, 5b.
It is also formed to move the same amount in the radial direction toward the central axis C.

The pitch changing cylinder 34 has a piston rod 34a that is freely expandable and retractable in the radial direction toward the central axis C between both cam plates 9R and 9L.
The cam plate 3 has a pair of cam grooves 38, 38 at the tip end of the pitch changing cylinder 34, which are inclined so as to gradually approach each other from the main body side of the pitch changing cylinder 34 toward the central axis C.
9 is fixed so as to be movable in the radial direction as the piston rod 34a expands and contracts. And the cam grooves 38, 38
Pins 40, 40 protruding from the ends of the cam plates 9R, 9L on the pitch changing cylinder 34 side are fitted into the cam plates 9R, 9L, respectively.

The cam plate 39 moves both cam plates 9R and 9L in the circumferential direction by moving in the radial direction under the operation of the pitch changing cylinder 34. For example, in FIG. When the pitch changing cylinder 34 moves the pins 40, 40 of the cam plates 9R, 9L toward each other guided by the cam grooves 38, 38, the cam plates 9R, 9L approach each other guided by the cam grooves 38, 38. , 9L are moved clockwise and counterclockwise in the figure, respectively.

Next, the operation when changing the number of tightening drive shafts 5, 6 involved in tightening bolts and nuts (not shown) in such a multi-nut runner will be explained with reference to FIGS. 1 to 3.

First, in FIG. 1, for example, when tightening four bolts or nuts (not shown) at equal intervals in the circumferential direction along the pitch circumference X (with the pitch circle radius R), As shown in the figure, only the four tightening drive shafts 5 are arranged on the pitch circumference X, and the specific tightening drive shaft 6 is retracted to the outside of the pitch circumference The drive shaft 5 is driven to rotate, and each bolt or nut is simultaneously tightened via the tightening socket 13 (see FIG. 2).

In this case, the specific tightening drive shaft 6 is shortened toward the main body 2 by the cylinder 24 so as not to get in the way during this tightening.

For example, when tightening five bolts or nuts (not shown) at equal intervals in the circumferential direction along the pitch circumference X (with the pitch circle radius R), the method shown in FIG. As shown, the specific tightening drive shaft 6 is the tightening drive shaft 5a, 5a.
The specific tightening drive shaft 6 and each tightening drive shaft 5 are arranged at equal intervals on the pitch circumference X.

More specifically, in this case, the piston rod 21a of the second advancing/retracting cylinder 21 of the advancing/retracting means 7
In the shortened state, the piston rod 20a of the first advance/retreat cylinder 20 is extended, and thereby the specific tightening drive shaft 6 moves toward the central axis C together with the first moving base 17 and the second moving base 19. and move forward.

At this time, both link groups 8R and 8L of the circumferential moving means 8 are moved to the first moving base 1 as described below.
It operates in cooperation with the forward movement of 7.

That is, for example, in the right link group 8R, the arm piece 26 moves forward together with the first movable base 17, and at this time, the first link piece 28 is engaged with its elongated hole 28a. The first link piece 28 is rotated counterclockwise in the figure around the support shaft 30 via the support shaft 26a of the arm piece 26, and the end of the first link piece 28 on the swinging piece 27 side is rotated. Approach the upper right circumferential moving part 3a. When the end of the first link piece 28 approaches the circumferentially moving part 3a in this way, the circumferentially moving part 3a moves toward the lower right circumferentially moving part 3b via the swinging piece 27. As a result, the upper right tightening drive shaft 5a moves clockwise on the pitch circumference move around.

At this time, the second link piece 29 of the link group 8R moves clockwise together with the circumferentially moving portion 3b,
During the movement, the elongated hole 29a of the second link piece 29
By engaging with the support shaft 31 of the lower right circumferential moving part 3b,
Until the end of the elongated hole 29a on the side of the circumferentially moving part 3a comes into contact with the support shaft 31, the circumferentially moving part 3b is moved clockwise without being moved. After the support shaft 31 comes into contact with the end of the elongated hole 29a, the second link piece 29 moves the circumferentially moving part 3b clockwise as the circumferentially moving part 3a moves.

Also, in the left link group 8L, by the same operation as the right link group 8R, as the first moving base 17 moves forward, the upper left circumferential moving part 3a and the lower left circumferential moving part 3a move in the circumferential direction. The portions 3b are sequentially moved counterclockwise.

[0050] In such an operation, finally,
When the specific tightening drive shaft 6 is advanced to a position on the pitch circumference
b, 3b are moved in the circumferential direction to the positions where they abut against the stoppers 32b, 32b, respectively, and at this time, each tightening drive shaft 5, together with the specific tightening drive shaft 6, is moved as shown by the imaginary line in the figure. They are arranged at equal intervals in the circumferential direction on the pitch circumference X.

Next, after each tightening drive shaft 5 and specific tightening drive shaft 6 are arranged on the pitch circumference X,
These tightening drive shafts 5 and 6 are rotationally driven, and each bolt or nut is tightened all at once along a pitch circumference X having a pitch circle radius R via the tightening socket 13 (see FIG. 2).

In this case, the specific tightening drive shaft 6 is located at a position where its tightening socket 13 is at the same height from the main body 2 as the tightening socket 13 of each tightening drive shaft 5 during this tightening. Then, the cylinder 24 extends the cylinder 24 .

Furthermore, the tightening drive shaft 5 and the specific tightening drive shaft 6
When the specific tightening drive shaft 6 is moved backward from the state in which the links are arranged on the pitch circumference
By the operation of 8L opposite to the above, only the tightening drive shaft 5 is arranged on the pitch circumference X again.

Next, the operation of changing the pitch circle radius of the tightening drive shafts 5 and 6 in this multi-nut runner will be explained with reference to FIGS. 4 and 5.

In FIG. 4, for example, when only four tightening drive shafts 5 are arranged on the pitch circumference X of the pitch circle radius R (the state shown in FIG. 1), When these tightening drive shafts 5 are arranged on a pitch circle Y with a small pitch circle radius r, that is, when the pitch circle radius of the tightening drive shaft 5 is reduced, the pitch of the radial moving means 9 is The change cylinder 34 allows the cam plate 39 to
are retreated in the radial direction away from the central axis C, and at this time, as described above, the two cam plates 9R, 9L are moved so that the ends of the two cam plates 9R, 9L on the pitch changing cylinder 34 side approach each other. 9L is moved circumferentially/clockwise and circumferentially/counterclockwise, respectively.

In this case, the movement of both cam plates 9R, 9L is performed by the pins 37, 37 of the upper radial moving parts 4a, 4a.
are moved to the positions where they abut the ends of the cam grooves 36a, 36a on the specific tightening drive shaft 6 side, respectively, and at this time, the cam plate 39 is moved to the position where the pins 40, 4 of both cam plates 9R, 9L are in contact with the ends of the specific tightening drive shaft 6 side.
0 reaches approximately the center position of the cam grooves 38, 38 of the cam plate 39 and is stopped.

When both cam plates 9R and 9L are moved in this manner, each radial moving portion 4 has its pin 37 aligned with the cam groove 36a of each cam plate 9R and 9L, as described above.
36a and move forward together with each tightening drive shaft 5 in the radial direction toward the central axis C, and when the movement of both cam plates 9R, 9L is finally stopped, each tightening drive shaft 5
is the pitch circumference Y of the pitch circle radius r as shown by the imaginary line in the same figure.
They are arranged on the top at equal intervals in the circumferential direction.

After each tightening drive shaft 5 is arranged on the pitch circumference Y in this way, as in the previous case,
It becomes possible to tighten four bolts or nuts (not shown) along the pitch circumference Y with a pitch circle radius r.

In addition, from this state, if the cam plate 39 is advanced toward the center axis C by the pitch changing cylinder 34 in the opposite direction to the above, each tightening is performed by the opposite operation of both cam plates 9R, 9L, etc. The attached drive shafts 5 are arranged on the pitch circumference X again.

Next, in FIG. 4, for example, in a state where the tightening drive shaft 5 and the specific tightening drive shaft 6 are arranged on the pitch circumference X of the pitch circle radius R (as shown by the imaginary line in FIG. 3) , when arranging these tightening drive shafts 5 on the pitch circumference Y with the pitch circle radius r, both cam plates 9R,
9L are moved circumferentially/clockwise and circumferentially/counterclockwise, thereby moving each radial moving portion 4, together with each tightening drive shaft 5, radially forward toward the central axis C.

In this case, since the radial moving parts 4 are arranged on the pitch circumference X together with the specific tightening drive shaft 6, they move in the circumferential direction so as to approach each other toward the pitch changing cylinder 34 side. Therefore, each radial moving part 4
The pin 37 has also been moved toward the pitch changing cylinder 34 within each cam plate 9R, 9L. In this case, the movement of both cam plates 9R, 9L in the circumferential direction is such that the pins 40, 40 of both cam plates 9R, 9L contact the ends of the cam grooves 38, 38 of the cam plate 39 on the center axis C side. At this time, each radial moving part 4 is moved until its pin 3
7 is the cam groove 36a, 36a of each cam plate 9R, 9L
are guided by the respective tightening drive shafts 5 in the radial direction toward the central axis C. Finally, when the movement of both cam plates 9R, 9L and the cam plate 39 is stopped, each tightening drive shaft 5 is positioned on the pitch circumference Y of the pitch circle radius r, as shown by the imaginary line in the figure. reach

Meanwhile, in parallel with this, the advance/retreat movement means 7
The piston rod 21a of the second advance/retreat cylinder 21 is extended, and thereby the specific tightening drive shaft 6 is advanced toward the central axis C together with the second moving base 19, and finally,
It reaches the pitch circumference Y. At this time, the first moving base 1
7 is not moved, both the link groups 8R and 8L (see FIG. 1) are not operated, and the circumferential moving section 5 (see FIG. 1) is not moved.
It also does not move in the circumferential direction.

In this way, when each tightening drive shaft 5 and the specific tightening drive shaft 6 are advanced to a position on the pitch circumference Y, these tightening drive shafts 5 and 6 As in the case described above, five bolts or nuts (not shown) can be tightened along the pitch circumference Y of the pitch circle radius r.

Further, from this state, if the cam plate 39 is moved backward by the pitch changing cylinder 34 and the specific tightening drive shaft 6 is moved backward by the second forward/backward movement cylinder 21, the reverse of the above will be achieved. By operation, each tightening drive shaft 5
And the specific tightening drive shaft 6 is arranged on the pitch circumference X again.

[0065] According to this multi-nut runner, the number of tightening drive shafts 5, 6 involved in tightening bolts or nuts and the pitch circle radius thereof can be changed independently. Therefore, bolts or nuts can be tightened with different numbers and pitch radii.

Next, another example of the multi-nut runner of the present invention will be explained with reference to FIGS. 6 and 7.

In FIGS. 6 and 7, this multi-nut runner has the same basic structure as the multi-nut runner of the above-mentioned embodiment, and has four nuts arranged around the central axis C at the tip of the main body 2. four circumferentially movable parts 3 disposed around the central axis C so as to be movable in the circumferential direction so that each tightening drive shaft 5 is movable in the circumferential direction; Of the radial moving part 4 and the tightening drive shaft 5, which are provided in each circumferential moving part 3 so as to be movable in the radial direction, the upper tightening shaft 5 in FIG. A specific tightening drive shaft 6 that can move forward and backward in the radial direction toward a position between the attached drive shafts 5a and 5b.
and a forward/backward movement means 7 having first and second forward/backward movement cylinders 20, 21 for advancing and retracting the specific tightening drive shaft 6,
A circumferential moving means 8 having a link group 8R, 8L that moves each circumferential moving means 3 in the circumferential direction together with each tightening drive shaft 5 in cooperation with the forward and backward movement of the specific tightening drive shaft 6, and a tightening Cam plates 9R, 9L, 39 that move each radial moving part 4 in the radial direction to change the pitch circle radius of the drive shaft 5
and a radial moving means 9 having a pitch changing cylinder 34 and the like, which are provided on a base 41 formed at the distal end of the main body 2 so as to substantially close the inside thereof.

In this case, each tightening drive shaft 5 has its rear end inserted through a through hole 42 bored in the base 41 so as to be movable in the circumferential direction and the radial direction. Similarly, a constant velocity joint 14 and a rotation transmission shaft 15 (shown in FIG. 7) are connected to a motor (not shown).

The specific tightening drive shaft 6 is also inserted so that its rear end can move in the radial direction through a through hole 43 bored in the base 41, and similarly to the tightening drive shaft 5, it moves at a constant speed. The joint 14 and the rotation transmission shaft 15 (shown in FIG. 7) are connected to a motor (not shown).

On the other hand, as will be explained below, this multi-nut runner is different from the multi-nut runner described above in that the circumferentially movable portion 3 is movable in the circumferential direction.

That is, on the base 41, a support shaft 44 whose axis is the center axis C is provided to protrude, and each circumferentially moving part 3
As shown in FIG. 7, the support shaft 4
4, and is rotatably supported by the shaft 4, and is movable in the circumferential direction by the rotation.

Each radial moving section 4 is provided in each circumferential moving section 3 in the same configuration as the multi-nut runner described above, and is movable in the radial direction toward the central axis C. 5 is supported by each radially moving portion 4 in the same configuration as the multi-nut runner described above, whereby each tightening drive shaft 5 is movable in the circumferential direction and the radial direction.

[0073] Furthermore, the forward/backward moving means 7, the circumferential direction moving means 8, and the radial direction moving means 9 have the same construction as that of the multi-nut runner.

[0074] In such a multi-nut runner,
Obviously, the operation is basically the same as the multi-nutrunner described above.

That is, as shown in FIG. 6, the pitch radius R
With the tightening drive shafts 5 arranged at equal intervals on the pitch circumference As a result, both link groups 8R and 8L of the circumferential moving means 8 operate as described above, and each tightening drive shaft 5 and specific tightening drive shaft 6 are arranged at equal intervals on the pitch circumference X. . Then, from this arrayed state, if the specific tightening drive shafts 6 are reversely moved back by the first advance/retreat cylinder 20, only the tightening drive shafts 5 are arranged on the pitch circumference X again.

Further, with the tightening drive shafts 5 arranged at equal intervals on the pitch circumference X with the pitch radius R, the cam plate 39 is
When the cam plates 9R and 9L are moved backward, the radial moving part 4 and the tightening drive shaft 5 are moved forward toward the central axis C, and the tightening drive shaft 5 is moved forward as shown in the phantom line in FIG. The shafts 5 are arranged on a pitch circumference Y having a pitch circle radius r.

Further, with the tightening drive shaft 5 and the specific tightening drive shaft 6 arranged at equal intervals on the pitch circumference X with the pitch radius R, the pitch changing cylinder 34 of the radial moving means 9
When the cam plate 39 is moved backward and the specific tightening drive shaft 6 is advanced by the second movement cylinder 21 of the movement means 7, the tightening drive shaft 5 and The specific tightening drive shafts 6 are arranged on a pitch circumference Y with a pitch circle radius r.

Therefore, in this multi-nut runner as well, the number of tightening drive shafts 5 and 6 involved in tightening bolts or nuts and the pitch circle radius thereof are changed independently. Alternatively, the nuts can be tightened with different numbers and pitch radii.

In the embodiment described above, the number of tightening drive shafts 5 is four, but the number is not limited to this, and the number of tightening drive shafts 5 may be varied. Of course it is possible.

[0080]

As is clear from the above description, according to the present invention, a plurality of tightening drive shafts are disposed on the base at intervals in the circumferential direction, and The specific tightening drive shaft is provided so as to be movable in the radial direction, and the specific tightening drive shaft is provided so as to be movable in the radial direction toward the position between a pair of circumferentially adjacent tightening drive shafts. By moving the tightening drive shaft in the circumferential direction in cooperation with the forward and backward movement of the attachment drive shaft, only the tightening drive shaft or the tightening drive shaft and the specific tightening drive shaft are arranged at predetermined intervals in the circumferential direction, In addition, by engaging the tightening drive shafts so that they cooperate with each other to move in the radial direction, the number of tightening drive shafts arranged on the same circumference and the pitch between each tightening drive shaft can be reduced. can be changed independently and efficiently, and a plurality of nuts, bolts, etc. can be tightened with a plurality of pitch radiuses and a plurality of numbers.

[Brief explanation of the drawing]

[Fig. 1] Front view of an example of a multi-nut runner of the present invention.

[
Figure 2: Cross-sectional view taken along line II-II in Figure 1

[Figure 3] Diagram for explaining the operation of the multi-nut runner

[Figure 4]
Operation explanatory diagram of the multi-nut runner

[Fig. 5] Operation explanatory diagram of the multi-nut runner

FIG. 6 is a front view of another example of the multi-nut runner of the present invention.

[Figure 7] VI-VI in Figure 6
Line cross section

[Explanation of symbols]

1,41...base
5... Tightening drive shaft 6... Specific tightening drive shaft

Claims (1)

[Claims] Claim 1: Disposed on a base at intervals in the circumferential direction, movable in the circumferential direction, and movable in the radial direction toward the center of the circumference. a plurality of tightening drive shafts, and a specific tightening shaft provided so as to be movable in the radial direction toward a position between a pair of circumferentially adjacent tightening drive shafts among the tightening drive shafts. and a tightening drive shaft, the tightening drive shaft is configured to move the plurality of tightening drive shafts and the specific tightening drive shaft when the specific tightening drive shaft is advanced to a position between the set of tightening drive shafts. a first array position where the drive shafts are arranged at predetermined intervals according to the number of drive shafts in the circumferential direction; and a position where the specific tightening drive shaft is retreated from a position between the set of tightening drive shafts. A second structure in which only the plurality of tightening drive shafts are arranged in the circumferential direction at predetermined intervals corresponding to the number of tightening drive shafts when the
are provided so as to be movable in the circumferential direction in cooperation with the forward and backward movements of the specific tightening drive shaft between the arranged positions of the drive shafts, and are further engaged with each other so as to be movable in cooperation with the radial direction. A multi-nut runner characterized by: