JP2675524B2 - Gear mounting structure - 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 mounting structure.

[0002]

2. Description of the Related Art A conventional gear mounting structure will be described with reference to FIG. 50 is a mounting member. The mounting member 50 has a mounting hole (not shown) for mounting a shaft described later.
Are drilled. 52 is a shaft, and one end (the left end in FIG. 2) is fixed to the mounting member 50. More specifically, the shaft 52 is composed of a main body portion 54 having a constant diameter, and a caulking portion 56 extending from one end of the main body portion 54 along the axial direction of the main body portion 54 . The caulking portion 56 is formed to have a diameter that can be inserted into the mounting hole of the mounting member 50, and the main body portion 54 is formed to have a larger diameter than the caulking portion 56, and restricts movement of a gear described later on the shaft 52. E-ring mounting grooves (not shown) are provided on the outer peripheral surface so as to be separated from each other by at least the thickness of the gear. With the configuration described above, the caulked portion 56 of the shaft 52 is attached to the mounting member 5.
It is fixed to the mounting member 50 by being inserted into the No. 0 mounting hole and caulking the tip of the caulking portion 56 protruding from the mounting hole. Reference numeral 58 denotes a gear, which is formed as a circular gear as an example. Further, a through hole (not shown) through which the main body portion 54 of the shaft 52 can pass is formed in the central portion of the gear 58. The gear 58 is fitted into the through hole of the shaft 52.
After the main body portion 54 is inserted and positioned between the E-ring mounting grooves, the E-ring 60 is mounted in the E-ring mounting groove, so that the movement between the E-ring mounting grooves is restricted. Mounted on shaft 52.

[0003]

However, the above-described conventional gear mounting structure has the following problems. To restrict the movement of the gear 58 on the shaft 52, E
Since it is necessary to attach two rings 60 to the main body portion 54 of the shaft 52, and the number of parts is large, there is a problem that the time required for attachment increases and the manufacturing cost rises. Therefore, the present invention has been made to solve the above problems,
It is an object of the invention to provide a gear mounting structure that can be mounted in a short time by reducing the number of parts.

[0004]

The present invention has the following constitution in order to achieve the above object. That is, one end portion can be fixed to the attachment member, and has a specific portion extending from the one end portion to the other end side, and a main body portion extending from the specific portion end portion to the other end side. The main body portion is formed in a tubular shape with both ends open and a shaft formed with a diameter larger than that of the specific portion, and is provided coaxially with a gear to be attached to the shaft and is formed on one end surface of the first portion. Is a cylinder formed such that one end of the shaft and the specific portion can pass through and the main body portion cannot pass through, and a second opening formed on the other end surface also allows the main body portion to pass through. A body is provided, and the shaft is inserted from one end side through the second opening of the cylindrical body provided coaxially with the gear,
One end of the shaft protruding from the first opening of the tubular body is fixed to the mounting member, and movement of the tubular body and the gear on the shaft is restricted within a length range of the specific portion. It is characterized by

[0005]

When the shaft is inserted from one end side through the second opening of the cylindrical body in which the gears are coaxially provided and one end of the shaft protruding from the first opening of the cylindrical body is fixed to the mounting member, Since the first opening of the tubular body is formed so that one end of the shaft and the specific portion can pass through and the main body portion cannot pass through, the tubular body and the gear can move on the shaft within the length range of the specific portion. Regulated.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. First, the structure of each component will be described with reference to FIG. The same components as those of the conventional example are designated by the same reference numerals, and the description thereof will be omitted. Mounting member 50
There are two mounting holes 10 for attaching the shaft, which will be described later.
One has been drilled. Reference numeral 12 denotes a shaft, which extends from one end (the left end in FIG. 1) to the other end (the right end in FIG. 1).
And a main body portion 16 extending from the right end of the specific portion 14 to the other end side, and the main body portion 16 is formed to have a larger diameter than the specific portion 14. Although one end of the shaft 12 can be fixed to the mounting member 50, in this embodiment, as an example, a caulking portion 56 is extended from the left end surface of the specific portion 14, and the caulking portion 56 is attached to the mounting hole 10 of the mounting member 50. The structure is such that after it is inserted into, it is crimped and fixed. 18 is the shaft 12
It is a grease groove provided in the. Instead of extending the crimp portion 56, a screw hole may be formed in the left end surface of the specific portion 14 and one end of the shaft 12 may be fixed to the mounting member 50 with a screw, or the shaft may be press-fitted. 1
You may make it fix the one end part of 2 in the attachment hole 10. Further, when the shaft 12 is structured to be fixed to the mounting member 50 so as to be rotatable about the axis, the first
Body portion 16 and specific portion 14 that form the shaft 12 of
The shape of may be replaced by a cylindrical shape and may be a polygonal shape.

Reference numeral 20 denotes a first gear, which is, for example, a circular gear and is provided coaxially with the first cylindrical body 22. The first tubular body 22 is formed in a tubular shape with both ends open, and the first opening 24 formed on one end face (left end face) allows the caulking portion 56 and the specific portion 14 of the shaft 12 to pass therethrough. The body portion 16 is formed so as not to pass.
The second opening 26 formed on the other end surface (right end surface) is formed so that the main body portion 16 can also pass through. In the present embodiment, the inner diameter of the first tubular body 22 is formed to be slightly larger than the outer diameter of the shaft 12 over almost the entire body, and the main body portion 16 can be inserted therein. Only the inner wall is formed with a small diameter portion 28 extending in the axial direction and having an inner diameter larger than the caulking portion 56 and the specific portion 14 and smaller than the main body portion 16, and only the main body portion 16 has the first diameter. It cannot pass through the opening 24. Also, the small diameter portion 28
The axial length of is formed to be slightly shorter than the length of the specific portion 14. In the present embodiment, the small diameter portion 28 has the first
Although it is continuously provided around the inner peripheral surface of the first opening 24 of the cylindrical body 22 and formed in a ring shape, the shape may be formed by a plurality of protruding portions instead of the ring shape.

Reference numeral 30 denotes a second gear, which is, for example, formed into a two-stage circular gear and provided coaxially with the second cylindrical body 32. The second cylinder 32 has the same structure as the first cylinder 22. Also, the second gear 3
0 consists of a small diameter gear 30a and a large diameter gear 30b, and at least the tooth pitch of the small diameter gear 30a is formed to be the same as that of the first gear 20.

Next, the mounting method will be described. First, the shaft 12 is inserted into each of the first cylindrical body 22 and the second cylindrical body 32 from the second opening 26 from one end side where the specific portion 14 is formed. Next, the caulking portion 56 of each shaft 12 is inserted into the mounting hole 10 of the mounting member 50 and caulking is performed to fix one end of the shaft 12 to the mounting member 50. When mounting the shaft 12, the first
The gear 20 and the small diameter gear 30a of the second gear 30 are attached so as to mesh with each other.

As a result, the movement of the small diameter portion 28 formed in the first opening portion 24 of each of the cylinders 22, 32 is restricted by the wall surface of the mounting member 50 and the left end surface of the main body portion 16, and thus the cylinders. 22, 32 and the shaft 12 of each gear 20, 30
Since the above movement is restricted within the length range of the specific portion 14, the cylindrical bodies 22, 32 and the gears 2 are mounted on the shaft 12.
It is possible to attach 0 and 30 permanently. Further, the cylindrical body 22, of the gear provided coaxially with the cylindrical bodies 22, 32,
By changing the distance from the one end side of 32, the distance of the gears 20 and 30 from the mounting member 50 can be set arbitrarily.

Further, in the gear mechanism in which the gears 20 and 30 are attached to the two or more shafts 12 and the rotational force is transmitted from the one gear 20 to the other gear 30 as in the present embodiment, on each shaft 12, Since the first gear 20 and the second gear 30 are movable in the axial direction of the shaft 12 within the length range of the specific portion 14, depending on the length of the specific portion 14, the right side surface of the first gear 20. And the second
The left side surface of the large-diameter gear 30b of the gear 30 may contact. In addition, burrs may sometimes be left on the teeth of the first gear 20 and the large-diameter gear 30b during manufacturing, but the burrs may be caught on other gears during this contact, which hinders rotation. Sometimes. In order to solve this problem, a disk-shaped or ring-shaped protruding portion 34 may be provided on each contacting side surface as shown in FIG. 1, and the protruding portions 34 may contact each other. Further, with this structure, the contact area can be reduced and smooth rotation can be performed, as compared with the case where the side surfaces of the gears 20 and 30b directly contact each other.

Although various preferred embodiments of the present invention have been described above, the present invention is not limited to the above-mentioned embodiments, and many modifications can be made without departing from the spirit of the invention. Of course.

[0013]

By using the gear mounting structure according to the present invention, the cylindrical body and the gear can be positioned and mounted on the shaft without using an E-ring or the like, which shortens the mounting time and reduces the number of working steps. it can. Moreover, since the number of mounting parts can be reduced, the product cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view showing an embodiment of a gear mounting structure according to the present invention.

FIG. 2 is a front view showing an example of a conventional gear mounting structure.

[Explanation of symbols]

 12 shaft 14 specific portion 16 main body portion 20 first gear 22 first cylinder 24 first opening 26 second opening 30 second gear 32 second cylinder 50 mounting member

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Bibliography Sho 50-63603 (JP, U) Steady opening Sho 53-28449 (JP, U) Steady opening Sho 58-50225 (JP, U) Steady opening Sho 61- 79062 (JP, U) Actual opening Sho 63-96311 (JP, U) Actual opening Sho 63-162163 (JP, U)

Claims (1)

(57) [Claims] 1. A specific portion, one end of which can be fixed to a mounting member, extends from the one end to the other end, and a main body portion extends from the end of the specific portion to the other end. The main body portion is formed on a shaft having a diameter larger than that of the specific portion, is formed in a tubular shape with both ends open, and is provided coaxially with a gear to be attached to the shaft, and is formed on one end surface. The first opening is formed so that one end of the shaft and the specific portion can pass and the main body cannot pass, and the second opening formed on the other end can pass the main body. And a cylindrical body provided with the gear, the shaft is inserted from one end side through the second opening of the cylindrical body provided coaxially with the gear, and the shaft is projected from the first opening of the cylindrical body. Fixing one end of the shaft to the mounting member, Mounting structure of the gear, characterized in that the regulating body and the movement on the shaft of the gear to the length range of the particular portion.