JPH0523103U - Rim holding device for tire testing machine - Google Patents

Abstract

(57) [Summary] [Object] To provide a rim holding device capable of holding a rim by surely aligning the rotation center of the tire with the rotation center of the spindle when mounting the tire on the spindle of the tire testing machine. [Structure] Main body 2 fixed to rotary shaft 1 of spindle
Is a mounting shaft 21 having a threaded portion 22 for screwing a nut 5 for fixing a tightening portion and a conical portion 23 at a base portion.
And a collet 6 fitted to the outer periphery of the conical portion 23, and a ring-shaped rim mounting surface 24. The tightening portion 3 mounted on the main body portion 2 includes a coil spring 32 that presses the collet 6, and a holding shaft 33 that is provided with a ball 34 that fits into a bolt hole 42 of the rim 4 and that is movable in the surface direction of the rim 4. Is equipped with.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a rim holding device for a tire testing machine, and more specifically, when mounting a tire on a spindle of the tire testing machine, it is necessary to ensure that the rotation center of the tire and the rotation center of the spindle are aligned to hold the rim. Rim holding device.

[0002]

[Prior Art]

 When mounting a tire on a tire testing machine, accurate test data cannot be obtained unless the axis of the spindle on which the tire is mounted and the center of rotation of the tire are aligned. Therefore, when mounting the rim on the spindle, the center of the rim must be surely aligned with the center of the spindle.

[0003]

[Problems to be solved by the device]

 Usually, when attaching a rim, a bolt protruding from the spindle is inserted into a plurality of bolt holes formed in the rim, and a nut having a tapered surface at the tip is screwed into the bolt. The bolt hole and the center of the bolt are aligned.

However, when the positions of the bolt holes formed in the rim are not accurately provided with respect to the rim center, the rim center, that is, the tire center and the spindle center can be aligned. There wasn't.

On the other hand, the center hole provided at the center of the rim is formed accurately in accordance with the center of the rim. Therefore, if the center hole is aligned with the center of the spindle, the axes of the two will be aligned exactly. Can be made

Therefore, the present invention provides a tire testing machine capable of surely aligning the position of the center hole with the center of the spindle and securely holding the rim even if the position of the bolt hole is deviated. An object is to provide a rim holding device.

[0007]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, a rim holding device for a tire testing machine of the present invention comprises a main body fixed to a rotating shaft of a spindle and a tightening portion attached to the main body. The main body has a threaded portion at its center so as to pass through the center hole of the rim and the center hole of the tightening portion, and has a threaded portion for screwing a nut for fixing the tightening portion at the tip, and at the base, A mounting shaft provided with a conical portion having a large diameter on the base side, a collet fitted to the outer periphery of the conical portion, and a ring-shaped rim mounting surface provided at a predetermined distance from the outer peripheral surface of the collet. The tightening portion has a coil spring that is provided in a central portion of the fastening portion so as to surround the mounting shaft and presses the collet toward the base side, and is provided corresponding to a bolt hole of a rim, and is provided at a tip thereof. Use a ball with a diameter larger than the bolt hole in the surface direction of the rim. It is characterized in that a holding shaft provided movably.

[0008]

[Work]

 According to the above structure, when the center hole of the rim and the center hole of the tightening part are inserted into the mounting shaft and the tightening part is tightened with the nut for fixing the tightening part, first, the coil spring causes the collet to move the collet to the cone of the mounting shaft. To the center of the rim to align the center of rotation of the mounting shaft with the center of the rim, and then the ball at the tip of the holding shaft fits into the bolt hole to crimp the rim onto the rim mounting surface. ..

That is, with the center of the rim accurately aligned with the collet, the rim is held by being held between the ball at the tip of the holding shaft and the rim mounting surface. At this time, even if the position of the bolt hole is displaced, the ball at the tip of the holding shaft can move in the surface direction of the rim, so that the ball is fitted into the bolt hole accurately.

[0010]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

The rim holding device is composed of a main body portion 2 fixed to the rotary shaft 1 of the spindle, and a tightening portion 3 mounted on the main body portion 2.

A mounting shaft 21 is formed at the center of the main body 2 so as to penetrate through the center hole 41 of the rim 4 and the center hole 31 of the tightening portion 3. A screw portion 22 for screwing a nut 5 for fixing the tightening portion 3 is provided at the tip of the mounting shaft 21. Further, the base of the mounting shaft 21 is provided with a conical portion 23 having a large diameter on the base side, and the collet 6 is fitted on the outer circumference of the conical portion 23. Further, on the front surface of the main body portion 2, there is provided a ring-shaped rim mounting surface 24 provided at a predetermined distance from the outer peripheral surface of the collet 6.

As shown in FIG. 2, the collet 6 is a cylindrical body having an inner surface having a conical surface 61 corresponding to the tapered surface of the conical portion 23 and provided with a plurality of split grooves 62. When the collet 6 is pressed toward the large diameter portion of the conical portion 23, the split groove 62 is opened and the outer peripheral surface is spread uniformly.

On the other hand, the tightening portion 3 has a coil spring 32 which is provided in the center of the tightening portion 3 so as to surround the mounting shaft 21 and presses the collet 6 toward the base side of the mounting shaft 21, and the rim 4 and the rim 4. And a holding shaft 33 that presses and holds the mounting surface 24. A plurality of holding shafts 33 are provided on the outer peripheral portion of the tightening portion 3 corresponding to the bolt holes 42 of the rim 4, and a ball 34 having a diameter larger than that of the bolt holes 42 is flexible at the tip thereof. It is held by the sex tube 35. Further, the holding shaft 33 is formed shorter than the coil spring 32 so that the coil spring 32 can sufficiently press the collet 6 at the time of mounting.

To mount the rim 4, first, the nut 5 is removed, the tightening portion 3, the coil spring 32 and the sleeve 36 for guiding the coil spring 32 are removed from the mounting shaft 21, and the tire 43 is mounted. The mounting shaft 21 is inserted through the rim 4 and the collet 6 is positioned in the center hole 41. In this state, the outer peripheral surface of the collet 6 is slightly apart from the inner edge of the center hole 41, so that the rim 4 and the collet 6 can be easily attached.

Next, the sleeve 36 and the coil spring 32 are attached to the mounting shaft 21, the tip of the mounting shaft 21 is inserted into the center hole 31 of the tightening portion 3, and the nut 5 is tightened. In the initial stage of tightening the nut 5, the coil spring 32 presses the collet 6, the cone portion 23 is expanded by the action of the conical portion 23, and the center hole 41 of the rim 4 is positioned.

When the nut 5 is further tightened, the ball 34 at the tip of the holding shaft 33 fits into the bolt hole 42 of the rim 4, and the rim 4 is crimped to the rim mounting surface 24. At this time, since the ball 34 is movably held by the holding shaft 33 via the flexible tube 35, even if the position of the bolt hole 42 is deviated, the ball 34 moves and is securely held in the bolt hole 42. Fit together.

As described above, since the rim 4 is mounted on the rotary shaft 1 of the spindle with the center of the rim 4 being positioned by the collet 6, the center of the rim 4, that is, the rotation center of the tire 43 and the rotary shaft of the spindle. It is possible to match the rotation center of 1. Further, since the ball 34 is fitted in the bolt hole 42, the rotational force can be surely transmitted.

The shape and combination of each component can be appropriately set according to the size of the tire to be mounted, etc., and is not limited to the above embodiment.

[0020]

[Effect of the device]

 As described above, in the rim holding device of the tire testing machine of the present invention, since the center of rotation of the rim, that is, the tire can be reliably matched with the center of rotation of the spindle, accurate test data can be obtained. .. In addition, the rim can be attached / detached only by attaching / detaching one nut, which improves the efficiency of rim replacement work.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a rim holding device of the present invention.

FIG. 2 is a front view of a collet.

[Explanation of symbols]

1 ... Spindle rotating shaft 2 ... Main body 21 ... Mounting shaft 22 ... Screw part 23 ...
Conical part 24 ... Rim mounting surface 3 ... Tightening part 31 ... Center hole 32 ... Coil spring 33 ... Holding shaft 34 ... Ball 35 ... Flexible tube 4 ... Rim 41 ... Center hole 42 ... Bolt hole 5 ... Nut 6 ... Collet

Claims (1)

[Scope of utility model registration request] 1. A rim holding device for holding a rim on which a tire is mounted on a spindle of a tire testing machine, wherein the rim holding device includes a body portion fixed to a rotation shaft of the spindle.
And a tightening portion mounted on the main body portion. The main body portion is provided at its center so as to pass through the center hole of the rim and the center hole of the tightening portion, and the nut for fixing the tightening portion to the tip end portion. While having a screw part for screwing on,
A mounting shaft provided with a conical portion having a large diameter on the base side, a collet fitted to the outer periphery of the conical portion, and a ring-shaped rim mounting surface provided at a predetermined distance from the outer peripheral surface of the collet. The tightening portion has a coil spring that is provided in the center of the mounting portion so as to surround the mounting shaft and presses the collet toward the base side, and the tightening portion is provided corresponding to the bolt hole of the rim, and the tip thereof is provided. A rim holding device for a tire testing machine, comprising: a holding shaft provided with a ball having a diameter larger than that of a bolt hole so as to be movable in a surface direction of the rim.