JPH06106484A - Extraction of gear and picking out apparatus thereof - Google Patents

Abstract

PURPOSE:To pick out a gear smoothly without operating a picking out bolt by means of a tap causing distortion even if clearance does not exist between a wall surface and a wall side end surface of the gear. CONSTITUTION:When a gear 1 having a groove 7 on the outer peripheral wall of the gear and a claw 11 bent in an outside diameter direction are fitted to each other in the groove 7 in an end direction of bowl shape picking out metal 9 and a bolt 13 of a screw hole 8 is rotated, the gear 1 is moved in a picking out metal 9 direction, and it can be picked out.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and a tool for extracting a fitted gear.

[0002]

2. Description of the Related Art Conventionally, as a method for pulling out a gear that has been fitted, for example, when a gear is fitted at the tip of a shaft fitted in a transmission case and there is no gap between the box wall surface and the box side end face of the gear. , The end face of the gear was tapped in advance and it was pulled out by applying bolts and levers.

[0003]

There are various extraction methods of the conventional gear according to the structural mode of the gear to be extracted. For example, when the pulley is extracted from the shaft as a publicly known method, the pulley is attached to the end face of the pulley on the motor side. Hook the claw bent in the axial direction of the removal, press the tip of the bolt against the center of the motor shaft and rotate the bolt to move the pulley forward, but this is just between the end surface of the motor cover and the end surface of the pulley. In addition, there is a problem that the nails can be inserted because there is a large space, and the nails cannot be extracted without the nails if there is no space.

As described above, as a method of extracting a gear under the condition that there is no catch, an arbitrary tap screw is applied to the end surface of the gear, and a pushing screw is applied to the center of the lever,
I made bolt holes at both ends, tightened the gear and lever, and then pulled out the bolt at the center while screwing it in. This method has a problem that it requires a process of machining a screw hole on the end face of the gear, and it also takes time to set the extraction device, resulting in a high cost.

The above-mentioned extraction method has a problem in that an arbitrary prepared hole on the end face of the gear and the work in the tapping process are accompanied by distortion due to the plastic motion of the material, which affects the tooth profile accuracy of the gear after heat treatment. .

The present invention aims to eliminate tap screw holes and improve the accuracy of the tooth mold as described above. Further, the setting method at the time of withdrawing is easy, and the cost is improved according to the improvement of the accuracy of the tooth mold. The object of the present invention is to provide a method for extracting a gear and a device for extracting the gear, in order to achieve time reduction and cost reduction.

[0007]

In order to achieve the above object, in the method for extracting a gear and the device for extracting the same according to the present invention, a groove is formed on the inner and outer peripheral walls of the end surface of the gear and a claw is inserted into the groove. In addition, the claw is bent in the outer diameter direction or the axial center direction in the edge direction of the bowl shape.

A gear having an inner peripheral wall provided with a polygonal dent and a boss having another gear provided with a flat surface on the outer peripheral wall thereof, on the contrary.

The inner peripheral wall of the gear and the outer peripheral wall of the boss of the gear different from the inner peripheral wall are provided with grooves.

This is a bowl-shaped pusher having a screw hole at the center of the shaft, and a polygonal flattening surface is provided in the outer peripheral axial direction. The claws bent in the outer diameter direction are provided near the corners.

The nail of the withdrawal metal is bent in the axial direction in the opposite direction.

An appropriate number of rotation stopping rods are provided at the base of the bowl-shaped withdrawal metal.

A screw hole is provided at the center of the shaft of a bowl-shaped withdrawal die, and a gear withdrawing method and an extracting tool for the same are constructed by screwing a bolt having a pointed end into this screw hole.

[0014]

With the above-described structure, the end face of the gear is provided with grooves on the inner peripheral wall or outer peripheral wall, and the gear withdrawal metal is bent in the outer diameter direction or bent in the axial center direction. The nail is fitted into this groove.

A pointed bolt is screwed into the screw hole at the center of the shaft of the bowl-shaped withdrawal die, and the pointed belt is brought into contact with the center of the shaft protruding from the gear center shaft. turn. At this time, while continuing to rotate while supporting the detent bar with one hand, the gear works to pull in the direction of the withdrawal metal.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment will be described with reference to the drawings. FIG. 1 is a cross-sectional view of a preferred embodiment showing a groove 7 of a gear 1 of the present invention, a bowl-shaped withdrawal metal 9 and a claw 11 in an edge direction. is there. The embodiment of FIG. 1 has four flattened surfaces 1
0 is provided. Although not shown, the gear 1 is fitted into the involute shaft 14 projecting from the wall surface of the mission case and is in close contact with the wall surface. End face inner peripheral wall 2 of gear 1
The groove 7 is provided in the gear, and the shape of the gear 1 is as shown in FIGS. 3 (a) and 3 (b). The claw 11 of the withdrawal gold 9 is fitted to the groove 7. With the pawl 11 fitted, while supporting the anti-rotation rod 12 by hand and turning the bolt 13 inserted in the screw hole 18 with one hand, hit the center hole 15 of the involute shaft 14 and turn it further to rotate the gear. 1
Is pulled out in the direction of the withdrawal metal 9 according to the principle of movement of the screw. In addition, although the embodiment of the whirl-stop rod 12 is divided into four equal parts, it may be divided into three equal parts or two equal parts.

FIG. 2 is a sectional view showing a conventional extracting means. Although not shown, a gear d that is in close contact with the wall surface of the mission case, a bolt c at the center of the lever a, and bolt screws b at both ends of the lever a are respectively inserted into the threaded portion of the gear d, and the bolt c is rotated. And the gear d comes off. In this embodiment, at least two intermediate prepared holes are formed on the end surface of the gear d, and there is a tap step. After the heat treatment, the result of the tooth profile inspection affects the tooth profile accuracy of the gear d. Strain due to plasticity of the material occurs due to the prepared hole, tap, and heat treatment.

FIG. 3 is a shape view of the gear 1 of the present invention.
In the example, the dent 3 is a square. The depth from the end face of the dent 3 is 4.1 mm. As shown in FIG. 3B, a 2 mm wide groove 7 is inserted at a position 2 mm from the end face. The groove 7 has a diameter of 56 mm, and the outer diameter of the withdrawal jaw 11 is 55.8 mm. The width of the nail 11 is 1.9 mm. It should be noted that the width of the dent 3 at the top, bottom, left and right is 5
2 mm, the width of the flat surface 10 of the withdrawal gold 9 is 51
It is millimeter. When the square dent 3 of the gear 1 and the square flattening surface 10 of the bowl-shaped withdrawal piece 9 are aligned and pushed by hand and turned, the groove 7 and the claw 11 are fitted firmly. 5 is a perspective view of the withdrawal die 9 of this embodiment.
In this embodiment, the tooth profile accuracy is not affected even after the heat treatment in which the groove 7 is placed, and no distortion due to the conventional tapping process is observed.

FIG. 4 is a shape diagram having a structure opposite to that of FIG. 3 of the present invention. The example has a square boss shape and is provided with a flattened surface 6. 2 from the end of boss 4
Place 2 mm wide groove 7 at the place where it enters the millimeter. φ2
It is a 6 mm groove. FIG. 7 is a perspective view in which the direction of the claw 11 as shown in FIG. 6 is opposite to that of the claw 11 of FIG. 5. Claw 1 with a width of 1.9 mm where it enters 2 mm from the end surface with an inner diameter of 28 mm
1 projects in the axial direction. The inner diameter of the claw 11 is φ26.
It is 3 mm. When the claw 11 is located in the middle of the flat surface 6 and pushed in, the claw 11 comes into contact with the end surface of the boss 4 and the claw 11 having a width of 1.9 mm. When the withdrawal gold 9 is turned, (a ') in FIG.
The claw 11 fits into the groove 7 shown in (b '). This example
Similarly to FIGS. 3 and 5, even if the groove 7 has the shape of the boss 4, it does not affect the accuracy of the tooth profile after the heat treatment, and no distortion due to the conventional tapping process is observed.

[0020]

Since the present invention is constructed as described above, it has the following effects.

By eliminating the tap as a gear extracting means, it is possible to supply a gear having stable tooth profile accuracy without causing distortion even after heat treatment.

By providing a groove on the inner and outer peripheral walls of the gear as a catching means and fitting a claw of a withdrawal metal to this groove, it can be easily withdrawn only by pulling with a screw, and a complicated withdrawal time is required. It can be greatly shortened and the cost can be reduced.

The structure of the bowl-shaped withdrawal metal makes it compact and can be comfortably withdrawn even in a narrow space.

[Brief description of drawings]

FIG. 1 is a sectional view showing a preferred embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a conventional gear extracting means.

FIG. 3 is a dent shape diagram of a gear according to a preferred embodiment.

FIG. 4 is a boss shape diagram of a gear according to a preferred embodiment.

FIG. 5 is a perspective view of a withdrawal metal having a claw bent outward in a radial direction.

FIG. 6 is a perspective view of a withdrawal metal having a claw bent in the axial direction.

[Explanation of symbols]

 1 gear 2 inner peripheral wall 3 dent 4 boss 5 outer peripheral wall 6 flat surface 7 groove 8 screw hole 9 withdrawal metal 10 flat surface 11 claw 12 non-rotating rod 13 bolt 14 involute shaft 15 center hole a lever b bolt screw c bolt d gear

Claims (5)

[Claims] 1. A method for extracting a gear, wherein a polygonal recess (3) is provided on an inner peripheral wall (2) of the gear (1). 2. Outer peripheral wall (5) of the boss (4) of the gear (1)
A method for extracting a gear in which a polygonal flattened surface (6) is provided on the. 3. The method of extracting a gear according to claim 1, wherein the inner peripheral wall (2) and the outer peripheral wall (5) of the gear (1) are provided with grooves (7). 4. A bowl-shaped withdrawal metal (9) having a screw hole (8) at the center of the shaft, wherein a polygonal flattening surface (10) is formed in the outer peripheral axial direction. A claw (11) bent in the outer diameter direction is provided in the vicinity of the apex angle in the edge direction between the surface (10) and the flattened surface (10), and a detent bar (9) is provided at the base of the bowl-shaped withdrawal metal (9). 12) An appropriate number of gear extraction tools for screwing bolts (13) into screw holes (8). 5. A hook (1) of a bowl-shaped withdrawal die (9)
The gear extracting device according to claim 4, wherein 1) is bent in the axial direction.