JPH058025Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a pitch variable device for a multi-shaft nut runner.

[Conventional technology and its problems]

The pitch between individual nut runners is made variable so that the same nut runner can perform the fastening work even in multi-shaft nut runners with different tightening axle spacings. Various pitch variable methods have been proposed. For example, there are cam type and ring type, but both have the drawback of being complicated and bulky.

[Means for solving problems]

A pitch variable cylinder adjacent to the nut runner in parallel, and a pin that moves forward and backward when operated by this cylinder are fitted into a spiral groove, and the tip of the nut runner is rotatable with respect to the main body frame. It consists of a supported variable pitch cylinder and a casing equipped with a tightening shaft installed at the tip of the variable pitch cylinder and arranged with a difference between the axes of a single drive shaft. Power can be transmitted using gears, which allows the pitch to be easily and reliably changed simply by operating the cylinder.

〔Example〕

The pitch varying device for a multi-shaft nut runner of the present invention will now be described with reference to the illustrated embodiment.

In the figure, reference numeral 1 denotes a main body frame in which a plurality of nut runners 2 are arranged and fixed at predetermined intervals. 4 is suspended from a trolley 5 (or a fixed base) via a spring balancer 6 and a lifting cylinder 7, and the main frame 1 is attached to the main body frame 1 by the spring balancer 6.
The body frame is balanced so that manual lifting and lowering operations can be easily performed, and the lifting cylinder 7 automatically lifts and lowers the predetermined lifting process between the socket at the lower end of the nut runner and the tightening seat surface. Eggplant.

A plurality of nut runners 2 are arranged and fixed on the main body frame 1, but since the structure of the nut runners 2 is conventionally used, a detailed explanation of its structure, operation, etc. is not provided. Omitted. Further, in the illustrated embodiment, two nut runner units 2, 2 are provided, and the pitch variable device P is fixed below them, but the number of nut runners installed can be arbitrarily selected.

Next, the pitch variable device P attached to the lower part of the nut runner will be explained.

A pitch variable cylinder 8 is provided protruding from the main body frame 1 parallel to the main body 2 of the single nut runner,
In addition, a slide shaft 9 is provided on the frame parallel to the cylinder 8 and protrudes at least in the advancing and retracting direction of the rod 8a of the cylinder 8, and a slide bush 10 is slidably inserted into the slide shaft 9. 10 to the rod 8a
Fix it to the tip of the

Further, a pin 11 is provided protruding from this slide bush 10.

On the tip side of the nut runner unit 2, a variable pitch cylinder 13 is rotatably supported with respect to the main body frame 1 via bearings 12, 12, and a drive driven by the nut runner unit is installed inside the cylinder. A shaft 14 is provided, and this drive shaft 14 is supported within the variable pitch cylinder 13 by a bearing 15 so as to freely rotate within the cylinder 13. A spiral pitch variable groove 13H is formed in the longitudinal direction of the variable pitch cylinder 13, and the pin 11 is fitted into the groove 13H.

Further, a casing 16 of a pitch variable device is fixed to the tip of the variable pitch cylinder 13, and this casing 1
The distal end portion of the drive shaft 14 is inserted into the drive shaft 6, and the tightening shaft 17 is rotatably supported parallel to the drive shaft and its extension line. Then, the gear 18 provided on the tightening shaft 17 and the gear 19 at the tip of the drive shaft are meshed with each other to rotate the tightening shaft 17. A slide shaft 20 is provided at the tip of this tightening shaft 17 to be slidable in the longitudinal direction of the shaft center by spline fitting etc. and rotated together, and a desired socket S is provided at the tip of this slide shaft 20 in a detachable and replaceable manner. .

Although the casing 16 can be integrally formed into the desired shape, it can be divided into two or three or more parts so that the tightening shaft 17 and its bearing can be easily assembled by inserting and assembling the casing 16 inside. They can also be combined together.

The range that can be varied around the axial center of the drive shaft 14 is twice the distance L between the axial center of the drive shaft 14 and the axial center of the tightening shaft 17 .

In the variable pitch device constructed as described above, the cylinder 8 is operated to change the pitch between the nut runners, specifically between the sockets S and S. This causes the slide bush 10 to move along the slide shaft 9. At this time, the pin 11 protruding from the slide bush is inserted into the groove 13H of the variable pitch cylinder 13.
Since the pitch variable cylinder 13 is fitted in the main frame, the variable pitch cylinder 13 rotates with respect to the main body frame in accordance with the amount of movement of the pin 11.

Since the casing 16 is fixed to the variable pitch tube, the casing 16 also rotates around the center of the variable pitch tube.
At this time, the variable pitch cylinder and the casing rotate about the drive shaft 14, and the tightening shaft 17 provided with the socket rotates around the drive shaft 14 at a distance L as a radius. This allows the distance between the sockets of adjacent nut runners to be varied. Even when the pitch is variable, the driving shaft and the tightening shaft are meshed with each other through gears, so power can be transmitted smoothly.

[Effect of idea]

The pitch variable device of the present invention has a pitch variable cylinder adjacent to the nut runner in parallel, a pin that moves forward and backward by the operation of this cylinder, which fits into a spiral groove, and a body frame attached to the tip of the nut runner. It consists of a variable-pitch cylinder supported rotatably by the variable-pitch cylinder, and a casing equipped with a tightening shaft installed at the tip of the variable-pitch cylinder and arranged with a difference between the axes of a single drive shaft. Since the power can be transmitted between the tightening shafts using gears, the pitch can be changed reliably with a simple operation.Moreover, since the tightening shaft rotates using the distance between the two shafts as a radius, the amount of pitch change can be made even between the two shafts. It has the advantage of being twice the distance between the two.

[Brief explanation of the drawing]

FIG. 1 is a front view showing a main part in section, and FIG. 2 is an embodiment of the multi-shaft nut runner showing the entire shape. 1 is the main body frame, 2 is the Natsu runner alone,
8 is a cylinder, 11 is a pin, 13 is a variable pitch cylinder, 13H is a groove, 14 is a drive shaft, 16 is a casing, 17 is a tightening shaft, 18 and 19 are gears, and S is a socket.

Claims (1)

[Scope of utility model registration request] A pitch variable cylinder adjacent to the nut runner in parallel, and a pin that moves forward and backward when operated by this cylinder are fitted into a spiral groove, and the tip of the nut runner is rotatable with respect to the main body frame. It consists of a supported variable pitch cylinder and a casing equipped with a tightening shaft installed at the tip of the variable pitch cylinder and arranged with a difference between the axes of a single drive shaft. A variable pitch device for a multi-shaft nut runner that can transmit power using gears.