JP2574991Y2 - Gear holding jig - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gear holding jig for holding a ring-shaped gear and performing, for example, finishing and inspection.

[0002]

2. Description of the Related Art FIG. 2 shows a conventional gear holding jig. That is, concentrically with shank 1,
A gear holding plate 2 on which the gear A is mounted is formed, and a regulating plate 3 having an outer shape corresponding to the inner peripheral shape of the gear A is formed on the gear holding plate 2. Inserting the inner periphery of the gear A and placing the gear A on the gear holding plate 2,
A washer 4 is placed over the gear A, and a nut 5 is fastened to a screw formed at an end of the shank 1.
The gear A is integrated with the gear holding plate 2.

The gear holding jig in which the gear A is integrally held as described above is used, for example, as shown in FIG. That is, both ends of the shank 1 are rotatably held by the two center members 6 and 7, and the gear A is rotated while rotating the gear holding jig.
The toothbrush is measured with a dial gauge provided on the side of the camera.

[0004]

However, in the conventional gear holding jig, the inner periphery of the gear A is inserted into the regulating plate 3 and the gear A is placed on the gear holding plate 2. Since the gear A is integrated with the gear holding plate 2 by tightening the nut 5 on the threaded portion formed at the end of the shank 1 with the washer 4 from above, it takes time and effort to hold the gear. There is.

In the conventional gear holding jig, the regulating plate 3 is inserted into the inner periphery of the gear A so that the gear A is placed on the gear holding plate 2. In order to facilitate the insertion of the gear A, a slight gap S is formed between the regulating plate 3 and the gear A as shown in FIG. Therefore, the gear A may be mounted eccentrically with respect to the gear holding jig by the amount of the gap, and there is a problem that, for example, an error occurs in the measurement of the runout of the gear.

The present invention has been made in view of the above circumstances, and is capable of holding a gear in a short time and easily, holding the gear without eccentricity, and performing subsequent processing such as inspection. An object of the present invention is to provide a gear holding jig that can prevent an error from occurring.

[0007]

A gear holding jig according to the present invention comprises: a plate-shaped gear holding plate on which a ring-shaped gear is placed;
A collet mounting member projecting from substantially the center of the gear holding plate and having a threaded portion formed at least at an end portion, and a plurality of claw members which are concentrically inserted into the collet mounting member and are elastically deformed on the periphery are formed along the circumferential direction. And a nut screwed into a screw portion of the collet mounting member to press and move the collet in the axial direction, and a claw member of the collet at a position inside the gear on the gear holding plate. When the collet is pressed and moved by the nut to the facing position, the plurality of claw members of the collet abut, and the claw member elastically deforms toward the inner circumference of the gear to abut on the inner circumference. A tapered projection to be formed is formed.

[0008]

According to the gear holding jig of the present invention, the nut is loosened, the collet is slightly retracted, and the contact between the claw member and the tapered projection is released. Next, the gear is placed on the gear holding plate, and the nut is tightened again. As a result, the collet is pressed and moved toward the gear. At this time, the claw member of the collet is brought into contact with the tapered projection and is elastically deformed toward the inner periphery of the gear so as to evenly contact the inner periphery of the gear, so that the gear passes through the collet. It is held concentrically with the gear holding jig.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A gear holding jig according to an embodiment of the present invention will be described below with reference to the drawings.

The gear holding jig 10 of the present embodiment has a plate-shaped gear holding plate 11 on which a ring-shaped gear A is placed, a screw protruding from the center of the gear holding plate 11 to one side, and a screw at least at one end. A collet mounting member 13 in which a portion 12 is formed, a cylindrical collet 15 in which a plurality of claw members 14 which are inserted concentrically into the collet mounting member 13 and are elastically deformed on the periphery are formed along the circumferential direction; A nut 16 is screwed into the threaded portion 12 of the collet mounting member 13 to press and move the collet 15 in the axial direction, and a rod-shaped gripping member 17 protruding to the other side of the gear holding plate 11 is provided.

Further, the claw member 1 of the collet 15 is located at a position inside the gear A on the gear holding plate 11.
When the collet 15 is pressed and moved by the nut 16 to the position where the 4 faces, the plurality of claw members 14 of the collet 15 come into contact with each other, and the claw members 14 are elastically deformed toward the inner periphery of the gear A. A tapered projection 18 is formed to be brought into contact with the inner periphery.

The claw member 14 of the collet 15
A plurality of slits are formed in the cylindrical collet 15 at predetermined intervals in the circumferential direction, and a space between these slits is configured as the claw member 14. In this embodiment, six pawl members 14 are provided uniformly over the entire circumference.

Next, the method of use and operation of the gear holding jig 10 of this embodiment will be described.

First, the nut 16 is loosened, the collet 15 is slightly retracted, and the contact between the claw member 14 and the tapered projection 18 is released. Next, the gear A is placed on the gear holding plate 11 and the nut 16 is tightened again. Thereby, the collet 15 is pressed and moved toward the gear A. At this time, the claw member 14 of the collet 15 abuts on the tapered projection 18 and is elastically deformed toward the inner periphery of the gear A, so as to evenly contact the inner periphery of the gear A. Are concentrically held on the gear holding jig 10 via the collet 15.

As described above, the gear holding jig 10 of this embodiment is
According to the above, the nut A is loosened and the gear A is moved to the gear holding plate 11.
The gear A can be held or released by a simple operation such as placing the gear A on the base and tightening the nut 16 again. Therefore, the workability of attachment or detachment can be remarkably improved as compared with the conventional gear holding jig described above.

Further, according to the gear holding jig 10 of the present embodiment, the plurality of claw members 14 provided in the circumferential direction on the peripheral edge of the collet 15 are pressed against the inner circumference of the gear A to make contact therewith. Therefore, the gear A is mounted to be aligned with the collet 15. Therefore, when processing such as inspection and processing is performed on the gear A held by the gear holding jig 10, the accuracy of these processing can be improved.

[0017]

As described above, according to the gear holding jig of the present invention, a plate-shaped gear holding plate on which a ring-shaped gear is mounted, and at least one end protruding from substantially the center of the gear holding plate. A collet mounting member having a threaded portion formed therein, a collet in which a plurality of claw members which are concentrically inserted into the collet mounting member and are elastically deformed on the periphery are formed along the circumferential direction, and a screw of the collet mounting member A nut that is screwed into the part and presses and moves the collet in the axial direction.The collet is moved by the nut at a position inside the gear on the gear holding plate and at a position facing the claw member of the collet. Since the plurality of claw members of the collet come into contact with each other when the collet is pressed and moved, the claw members are elastically deformed toward the inner periphery of the gear, and a tapered projection is formed to abut on the inner periphery. It is possible to hold the short period of time and easily gear, it is possible to prevent the arising of errors in the processing of a subsequent inspection can hold without eccentric gear.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a gear holding jig according to an embodiment of the present invention.

FIG. 2 is a sectional view showing a conventional gear holding jig.

FIG. 3 is a diagram illustrating a method of using a conventional gear holding jig.

FIG. 4 is a sectional view showing a defect of a conventional gear holding jig.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Gear holding jig 11 Gear holding plate 12 Screw part 13 Collet mounting member 14 Claw member 15 Collet 16 Nut 18 Tapered projection

Claims (1)

(57) [Scope of request for utility model registration] 1. A plate-shaped gear holding plate on which a ring-shaped gear is mounted, a collet mounting member projecting from substantially the center of the gear holding plate and having a threaded portion formed at least at one end, and the collet mounting member A collet formed of a plurality of claw members which are inserted concentrically and are elastically deformed on the periphery along a circumferential direction, and a nut which is screwed into a screw portion of the collet mounting member and presses and moves the collet in the axial direction. The plurality of claw members of the collet abut when the collet is pressed and moved by the nut at a position inward of the gear and a position where the claw member of the collet faces the gear holding plate. A gear holding jig, characterized in that a tapered projection for elastically deforming the claw member toward the inner periphery of the gear and making contact with the inner periphery is formed.