JPS6242347Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a test chucking device for a dynamic balance tester.

In a dynamic balance tester, when performing a dynamic balance test on a monolithic test piece, a plurality of claws are pressed in a radial direction at a certain axial position on the inner peripheral surface of the test piece,
This method is generally used to center and chuck the test specimen. However, depending on the specimen, it may be necessary to press a plurality of claws radially onto the inner peripheral surface of the specimen at two different axial positions. For example, for a test specimen in which two parts are assembled so as to be movable relative to each other in the axial direction, it is necessary to press a plurality of claws against the inner circumferential surface of each part at two different axial positions. Hitherto, there has been no suitable device for centering and chucking this type of specimen.

Therefore, this invention radially presses a plurality of claws at two different axial positions on the inner circumferential surface of a test specimen to be subjected to a dynamic balance test, thereby centering the test specimen, This was done to make it possible to track. In particular, this invention uses a push rod and a taper cone each having a tapered surface at the tip, the taper cone is fitted onto the outer circumferential surface of the push rod so that it can move relatively in the axial direction, and a disc spring or the like is installed between the push rod and the taper cone. An elastic means is interposed so as to be elastically deformable in the axial direction. and,
The push rod is pressed in the axial direction, and each pawl at one axial position is pressed against the inner peripheral surface of the test piece by the pressing force and the wedge action of the tapered surface of the push rod, and the elasticity of the elastic means and the wedge action of the tapered surface of the taper cone are Each claw at the other axial position is pressed against the inner circumferential surface of the test piece by a wedge action.

Hereinafter, embodiments of this invention will be described with reference to the drawings.

In the figure, a test specimen 1 is a combination of two parts 2 and 3 having different inner diameters so as to be relatively movable in the axial direction. After being centered and chucked by the chucking device, the test specimen 1 is rotated around the axis X and subjected to a dynamic balance test.

The push rod 4 has a tapered surface 5 at its tip and is arranged on the axis X. The tapered cone 6 has a tapered surface 7 at its tip, and is fitted to the outer peripheral surface of the push rod 4 so as to be slidable relative to it in the axial direction. In this embodiment, a disc spring 8 is used as the elastic means, and the disc spring 8 is installed between the taper cone 6 and the guide ring 9 so as to be elastically deformable in the axial direction. The guide ring 9 is fitted onto the outer peripheral surface of the push rod 4 so as to be slidable in the axial direction relative to the outer circumferential surface of the push rod 4, and is engaged with an adjustment nut 10 screwed onto the push rod 4. Therefore, when the adjusting nut 10 is rotated, the guide ring 9 is slid in the axial direction relative to the push rod 4, and the elasticity of the disc spring 8 can be adjusted. The taper cone 6 and the guide ring 9 are fitted and guided so as to be slidable in the axial direction on the guide surface 12 of the main body 11. Further, although not shown, a cylinder is provided for applying an external force to the push rod 4 to press it in the axial direction.

When the push rod 4 is pushed and moved in the axial direction, its tapered surface 5 comes into contact with the bellow ram 13. Verofram 13 is one part 2 of test specimen 1
It is fixed to the end surface of the main body 11 with bolts 15. The bellow frame 13 has a suitable spring constant and has a thin fulcrum 16 that is easily elastically deformable for displacing each pawl 14 in the radial direction, and the fulcrum 16 is located inward from the outer end of the pawl 14.

The tapered surface 7 of the tapered cone 6 contacts the three blades 17. Each blade 17 has three claws 18 for pressing against the inner circumferential surface of the other component 3 of the test specimen 1, and is fitted and guided by the guide surface 19 of the main body 11 so as to be slidable in the radial direction. .
Each blade 17 is elastically biased inward by an annular return spring 20 fitted into a groove at its outer end and the outer periphery of the main body 11 .

Each pawl 1 of the verofram 13 and blade 17
4 and 18 are arranged radially at two different axial positions A and B at equal angular intervals from each other as shown in FIGS.

In the chucking device of the dynamic balance tester constructed as described above, when an external force is applied to the push rod 4 by the cylinder and the push rod 4 is pressed and moved in the axial direction, the guide ring 9 moves against the guide surface of the main body 11. 12 in the axial direction and moves integrally with the push rod 4. The tapered cone 6 slides in the axial direction along the guide surface 12 until its tapered surface 7 contacts the blade 17, and moves integrally with the push rod 4.
The guide surface 12 guides the guide ring 9 and the tapered cone 6.

When the tapered surface 7 of the taper cone 6 contacts the blade 17, each blade 17 slides and is displaced in the radial direction along the guide surface 19 of the main body 11 due to the wedge action of the tapered surface 7. Therefore,
The claw 18 of each blade 17 contacts the inner circumferential surface of the component 3 of the test specimen 1 at the axial position B. Thereafter, the push rod 4 moves in the axial direction relative to the taper cone 6, and the taper cone 6 does not move. The disc spring 8 is elastically deformed in the axial direction and absorbs relative movement between the push rod 4 and the taper cone 6. Therefore, the claws 18 of each blade 7 are pressed radially against the inner peripheral surface of the component 3 by the elasticity of the disc spring 8 and the wedge action of the tapered surface 7 of the tapered cone 6. As a result, the part 3 of the test specimen 1 is centered and chucked.

When the push rod 4 moves further, its tapered surface 5 comes into contact with the bellow ram 13. Therefore, the fulcrum 16 of the bellow ram 13 is elastically deformed by the pressing force of the push rod 4 and the wedge action of the tapered surface 5, and the pawls 14 are displaced in the radial direction. Each pawl 14 is pressed radially against the inner circumferential surface of the component 2 of the specimen 1 at the axial position A. As a result, the part 2 is centered and chucked.

Therefore, two different axial positions A and B
The three claws 14 and 18 can be pressed against the inner circumferential surfaces of the parts 2 and 3, respectively, and the entire test specimen 1 can be centered and chucked. The relative movement between the push rod 4 and the taper cone 6 is absorbed by the elastic deformation of the disc spring 8, and the pawls 14 and 1 at each axial position A and B are
8 are not interfered with each other and are pressed independently against the inner circumferential surfaces of the parts 2 and 3, so there is no problem even if the inner diameters of the parts 2 and 3 are different. Axial position A
Each pawl 14 is accurately pressed against the inner peripheral surface of the component 2 by the pressing force of the push rod 4 and the wedge action of the tapered surface 5, and regardless of this, each pawl 18 at the axial position B is pressed against the elastic force of the disc spring 8. The tapered cone 6 is accurately pressed against the inner circumferential surface of the component 3 by the wedge action of the tapered surface 7.

Note that each pawl 14 of the bellophram 13 actually not only displaces in the radial direction but also rotates around the fulcrum 16. Therefore, the moment acts on part 2 of test specimen 1. The fulcrum 16 is the claw 1
Part 2 is located inward from the outer edge of Part 4.
is pressed in the axial direction toward the main body 11 by a component of the moment. This device therefore makes it possible to press the end face of the part 2 against the end face of the bellofram 13 in the axial direction, thereby making it possible to completely fix the entire test specimen 1.

To release the chuck, the push rod 4 can be moved in the opposite direction. pushyrod 4
When moved in the opposite direction, the tapered surface 5 separates from the bellofram 13, and the claws 14 of the bellofram 13 return to their original positions due to the elasticity of the fulcrum 16, and are separated from the inner peripheral surface of the part 2 of the test specimen 1. Leave. Thereafter, the tapered surface 7 of the tapered cone 6 separates from the blade 17, and each blade 17 is returned to its original position by the return spring 20. Therefore, the claws of the blade 17 separate from the inner peripheral surface of the component 3, and the test specimen 1 is released.

It should be noted that various modifications of this invention can be considered in addition to the above-mentioned embodiments. For example, it is not necessary to use the disc spring 8, and other elastic means such as a coil spring may be used. in short,
If a suitable elastic means is interposed between the push rod 4 and the taper cone 6 so that it can be elastically deformed in the axial direction, and the relative movement between the push rod and the taper cone can be absorbed by the elastic deformation of the elastic means, a similar result can be obtained. It is something that can produce effects. Further, it is not always necessary to combine the bellofram 13 and the blade 17, and various other combinations are possible.

As explained above, this device can press a plurality of claws in the radial direction at two different axial positions on the inner circumferential surface of the test specimen to be subjected to a dynamic balance test, thereby achieving the intended purpose. It is something that can be done. In addition, by simply pressing the push rod, the claws at two axial positions can be pressed against the inner circumferential surface of the specimen, centering and chucking the specimen, making the configuration and operation extremely simple. can.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of this invention, and FIG. 2 is an end view of FIG. 1. 1... Test specimen, 4... Push rod, 5...
Tapered surface of push rod, 6... Taper cone, 7... Tapered surface of taper cone, 8... Belleville spring, 14, 18... Pawl, A, B... Axial position.

Claims (1)

[Scope of utility model registration request] On the inner circumferential surface of the specimen to be tested for dynamic balance, two different
This is a device for centering and chucking a test specimen by pressing a plurality of claws in the radial direction at two axial positions, respectively, on the outer circumferential surface of a push rod having a tapered surface at the tip.
A tapered cone having a tapered surface at its tip is fitted so as to be relatively movable in the axial direction, and an elastic means such as a disc spring is interposed between the push rod and the taper cone so as to be elastically deformable in the axial direction, and the push rod is moved in the axial direction. The claws at one axial position are pressed against the inner circumferential surface of the test specimen by the pressing force and the wedge action of the tapered surface of the push rod, and the elastic force of the elastic means and the wedge action of the tapered surface of the tapered cone are 1. A test specimen chucking device for a dynamic balance testing machine, characterized in that each claw at the other axial position is pressed against the inner circumferential surface of the test specimen by action.