JPH04105631U - Fixed structure of rotating member to rotating shaft - Google Patents

Abstract

(57) [Summary] [Purpose] Highly reliable fixing of rotating members and rotating shafts.
Furthermore, the present invention provides a structure for fixing a rotating member to a rotating shaft, which enables low cost. [Structure] A press-fitting fitting 2 is press-fitted into the mounting shaft portion 1a and fixed, a press-fitting claw piece 2c is integrally extended to the press-fitting fitting 2, and a press-fitting hole 3c into which the press-fitting claw piece 2c is press-fitted is formed in the rotating member 3. death,
A gap 3d is provided between the press-fitting claw piece 2c and the press-fitting hole 3c in the radial direction of the rotating member 3, and the rotating member 3 is press-fitted in the circumferential direction, and the rotating member 3 is press-fitted into the press-fitting metal fitting 2 through the press-fitting claw piece 2c.
The rotating member 3 and the rotating shaft 1 are fixed in the circumferential direction, and the centering is ensured by the fitting of the rotating member 3 and the rotating shaft 1. When aligning the center, there is a gap 3d between the press-fitting claw piece 2c and the press-fitting hole 3c, so that the press-fitting is not possible. Errors in the claw piece 2c can be absorbed.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a structure for fixing a rotating member to a rotating shaft, and in particular, it is made by molding. The present invention relates to a structure for fixing a rotating member to a rotating shaft using a rotating member such as a gear.

0002

[Conventional technology]

Generally, various devices such as magnetic recording and reproducing devices have various power transmission mechanisms. It is a device that connects rotating parts such as gears, cams, levers, etc. to the rotating round shaft of a motor, etc. It was configured in a fixed manner. In addition, due to the desire for greater weight and lower costs, rotating parts are being modeled. It was molded using cold molding.

0003 Connecting a rotary member (for example, a molded gear) and a round shaft by molding In the case of joining and fixing, the following various methods have been used.

0004 (1) Press fit the molded gear onto the round shaft and secure it. (2) After inserting the molded gear into the round shaft, glue and fix it. (3) A part of the outer periphery of the round shaft is cut off and processed into a non-circular cross section to create a molded gear. The fitting hole for the round shaft is also molded to the same shape and press-fitted. Or glue it after press fitting. (4) Make the outer circumference of the round shaft uneven by knurling, etc., and press-fit the molded gear. Ru. (5) Simultaneously mold a metal pipe into the round shaft fitting hole of the molded gear (insert mold) and press fit into the round shaft.

[0005]

[Problem that the idea aims to solve]

However, each of the above-mentioned conventional techniques has the following problems. First, (1) In the method, it is fixed by press-fitting, but since one gear is a molded gear, strong pressure is required. Since the press-fit part could not be inserted, there was a risk that the press-fit part would come loose, resulting in low reliability. Also, (2 ) method, the adhesive strength decreases when oil adheres to the round shaft, making it unreliable as in (1). This results in lower reliability and requires management work for the oil in the round shaft. Also, (3 ) and (4) require a cutting process, resulting in high costs. Also,( Method 5) requires an insert molding process, resulting in high costs. In this way, each of the methods described above offers a trade-off between reliability and low cost. Nakatsuta.

[0006] The present invention was devised in view of the problems of the prior art described above, and was designed to solve the problems. The purpose is to fix rotating members to rotating shafts with high reliability and low cost. It's about providing structure.

[0007]

[Means to solve the problem]

In order to achieve the above object, the present invention provides molding or other methods to the mounting shaft of the rotating shaft. Rotation of the rotating member to the rotating shaft of the rotating member to be integrated by fitting the mounting shaft fitting hole of the rotating member consisting of the In the rotational structure, a press-fit fitting is press-fitted into the mounting shaft member and fixed, and the press-fit fitting has a A press-fitting claw piece is integrally extended, and a press-fitting hole into which the press-fitting claw piece is press-fitted is formed in the rotating member. , the press-fit claw piece and the press-fit hole are provided with a gap in the radial direction of the rotating member, and The rotating member is configured to be press-fitted in the circumferential direction.

[0008]

[Effect]

By applying pressure to the press-fit fitting against the rotation shaft by the above means, the rotation shaft and the press-fit fitting are separated. can be strongly integrated. Then, surround the rotating member with the press-fit claw piece against this press-fit fitting. It is fixed in the direction and the center is guaranteed by the fitting of the rotating member and the rotating shaft. When centering, there is a gap between the press-fit claw piece and the press-fit hole, so the center will be automatically aligned. You can adjust the position.

[0009]

【Example】

Hereinafter, one embodiment of the present invention will be described based on the drawings. Figure 1 is a cross-sectional view of the main parts showing the fixing structure of the rotating member to the rotating shaft according to the present invention, and Figure 2 is FIG. 3 is an exploded perspective view of the fixing structure, and is a sectional view taken along the line A-A in FIG. 1.

0010 In these figures, 1 is a rotating shaft, and this rotating shaft 1 drives a motor (not shown). It consists of an axis. A mounting shaft portion 1a with a small diameter is provided at the tip of the rotating shaft 1. , a press-fit fitting 2 and a molded gear 3, which is a rotating member, are fitted to this mounting shaft portion 1a. ing.

[0011] The press-fit fitting 2 is formed by punching a plate material, and the mounting shaft portion 1a is press-fitted into the center of the press-fit fitting 2. An annular portion 2b constituting a hole 2a is formed, and a pair of press-fit claw pieces 2c are formed on the outer periphery. , 2c are bent at right angles. The width direction of this press-fit claw piece 2c is the molded gear. 3, and undercuts are formed on both side edges of the press-fit claw piece 2c. Engaging portions 2d, 2d are provided in a protruding manner.

0012 The molded gear 3 is formed by molding, and has teeth on its outer peripheral surface. A circular mounting shaft fitting hole 3b is provided in the center of the portion 3a. In addition, near the center of the flesh part of the molded gear 3, a pair of press-fit holes 3c, 3c are formed along the circumferential direction. It is perforated in an arc shape. The length of the press-fit hole 3c in the circumferential direction is the length of the press-fit claw piece 2. The width is set shorter than the width of c, and both engaging parts 2d, 2d of press-fitting claw piece 2c are in the press-fitting hole. The press-fitting claw piece 2c is inserted into the press-fitting hole 3c while elastically deforming the side surface of 3c. (See Figure 3). On the other hand, the centering of the molded gear 3 with respect to the rotating shaft 1 is The rotation of the press-fit claw piece 2c is determined by the fit between the shaft portion 1a and the mounting shaft fitting hole 3b. Even if there is an error in the distance from the center of the shaft 1, it is absorbed by the gap 3d. 3e is This is an escape recess of the annular portion 2b.

[0013] Next, the fixing method of the above embodiment will be explained. First, the annular part 2b of the press-fit fitting 2 is press-fitted into the mounting shaft part 1a of the rotating shaft 1 and fixed. . Next, attach the molded gear 3 to the tip of the mounting shaft portion 1a that passes through the press-fit fitting 2. The attached shaft fitting hole 3b is fitted into the molded gear 3 relative to the rotating shaft 1. Centering is performed. Also, due to this fitting, the press-fit claw pieces 2c, 2c of the press-fit fitting 2 are press-fitted into the press-fit holes 3c, 3c of the molded gear 3, respectively, and each engaging portion 2d... The molded gear 3 and the press-fit fitting 2 are thereby prevented from coming off and integrated. like this The molded gear 3 is fixed to the rotating shaft 1 via the press-fit fitting 2.

[0014] In the above embodiment configured in this way, the annular portion 2b of the press-fit fitting 2 is attached. It is press-fitted into the shaft portion 1a and integrated by press-fitting the press-fitting claw piece 2c into the press-fitting hole 3c. Therefore, even if there is oil on the shaft part 1a, it can be firmly press-fitted and fixed, increasing reliability. can. In addition, since the mounting shaft portion 1a can be left as a round shaft, the shaft portion 1a can be modified as usual. It requires no engineering work, has a simple overall configuration, can be made smaller, and can be manufactured in large quantities. Production is possible and costs can be reduced. Furthermore, if the direction of the press-fit fitting 2 is determined with respect to the mounting shaft portion 1a, the direction can also be restricted. It is possible. In the above embodiment, a molded gear was used as the rotating member, but the present invention For example, cams, levers, etc. made by molding are not limited to this. may also be applied.

[0015]

[Effect of the idea]

As explained above, according to the present invention, the reliability of fixing the rotating member and the rotating shaft is improved. High and low cost is possible.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a main part showing a structure for fixing a rotating member to a rotating shaft according to the present invention.

FIG. 2 is an exploded perspective view of the fixing structure of FIG. 1;

FIG. 3 is a sectional view taken along line AA in FIG. 1;

[Explanation of symbols]

1 Rotating axis 2 Press-fit fittings 2a hole 2b Annular part 2c Press-fit claw piece 3 Molded gear 3b Mounting shaft fitting hole 3c Press-fit hole 3d gap

Claims (1)

[Scope of utility model registration request] 1. In a structure for fixing a rotating member to a rotating shaft in which a mounting shaft fitting hole of a rotating member formed by molding is fitted into the mounting shaft of the rotating shaft to integrate the rotating member, the mounting shaft is A press-fitting fitting is press-fitted and fixed, a press-fitting claw piece is integrally extended to the press-fitting fitting, a press-fitting hole into which the press-fitting claw piece is press-fitted is formed in the rotary member, and the press-fitting claw piece and the press-fitting hole are different from each other. A structure for fixing a rotating member to a rotating shaft, characterized in that a gap is provided in the radial direction of the rotating member, and the rotating member is press-fitted in the circumferential direction.