JP2002089581A - Shaft-equipped rotor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the wear of a shaft by facilitating phase matching between a key and a key groove, and eliminating clearance between the shaft and a roller, in a mounting structure used when one end of the shaft is keyed to the roller. SOLUTION: The range within which the shaft 2 fits into the roller 1 is divided into an axially outer portion (a) biased to an axial end and an axially inner portion b inward of the outer portion, and the fitting portions of the key 4 and the key groove 5 are provided in the axially outer portion (a). Also, a clearance fit is used to fit the shaft 2 into the roller 1 in the axially outer portion (a) and an interference fit is used to fit the shaft 2 into the roller 1 in the axially inner portion b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a roller, a pulley,
TECHNICAL FIELD The present invention relates to a rotating body with a shaft in which a rotating body such as a gear is mounted on a shaft, and particularly to a key fitting structure between the shaft and the rotating body.

[0002]

2. Description of the Related Art FIGS. 2 (a) and 2 (b) show a rotating device with a shaft using a roller 1 as a rotating body, and the roller 1 is inserted through one end of a shaft 2. The shaft 2 is provided with an axial mounting recess 3 in which a key 4 is embedded. An axial key groove 5 is provided on the inner diameter surface of the roller 1, and the key 4 is fitted into a substantially central portion of the key groove 5, whereby the rotation of the roller 1 is prevented.

The roller 1 is positioned by a stopper 6 attached to the shaft 2, and a washer 7 having a size reaching the end surface of the roller 1 is applied to an end surface of the shaft 2, and a screw 8 is screwed to the shaft 2. By fixing the roller 1, the roller 1 is fixed to the end of the shaft 2.

In order to facilitate the alignment between the key 4 and the key groove 5 when assembling the roller 1 to the shaft 2, the outer diameter surface of the shaft 2 and the inner diameter surface of the roller 1 are fitted with a clearance. It is assumed that there is a gap. If this is an interference fit, the key 4 and the keyway 5
It is difficult to perform positioning when the phase is shifted.

[0005] The bearing device for supporting the shaft 2 is shown in FIG.
As shown in (a), a pair of rolling bearings 10 and 10 housed in a housing 9, and retaining rings 11 and 1 mounted on the inner surfaces of both ends of the housing 9 outside the respective bearings 10.
1, is constituted by one retaining ring 11 and a wave spring 12 interposed between one bearing 10, and is mounted on the shaft 2 through a collar 13 between the stopper 6 and the stopper 6.

[0006]

The fitting portion between the key 4 and the key groove 5 has a gap (play) in consideration of the ease of the fitting. , The minute reciprocating motion is repeated between the mating surfaces,
Friction due to creep or the like occurs between the roller 1 and the shaft 2, which increases the abrasion of the shaft 2 and causes damage to the shaft. In order to prevent the occurrence of creep and the like, there is a method in which a margin is provided between the shaft 2 and the roller 1. However, it is difficult to align the phase of the key 4 and the key groove 5 at the time of press-fitting, and the assemblability is impaired. is there.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a rotating body with a shaft which has an interference between a shaft and a roller and does not impair assembly.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, according to the present invention, a key is fixed to one end of a shaft, a rotating body having a key groove is inserted through the shaft, and the key is attached to the shaft. In a rotating body with a shaft fitted into the keyway and fixing the rotating body to one end of the shaft, a fitting range of the shaft and the rotating body is shifted toward the shaft end side, and an outer portion of the shaft and an inner portion thereof. And a fitting portion between the key and the key groove is provided at the outer portion of the shaft, and a fitting between the shaft and the rotating body at the outer portion of the shaft is a clearance fit. A configuration was adopted in which the fitting of the shaft and the rotating body in the one side portion was an interference fit.

[0009] According to the above configuration, since there is a clearance fit in the first half of the process of assembling the one end of the shaft and the rotating body, the phase of the key and the key groove can be easily adjusted. Also,
In the latter half of the assembling process, an interference fit is provided, so that abrasion due to creep or the like between the shaft and the rotating body is prevented.

The key may be a parallel key, and the key groove may be formed over the entire width of the rotating body.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings. A roller with a shaft is shown as an example of the rotating body with a shaft of the embodiment shown in FIG. In this structure, the roller 1 is inserted through one end of the shaft 2 as in the conventional case. The fitting range of the shaft 2 and the roller 2 is divided into an outer shaft portion a offset to the shaft end side and an outer shaft portion b inside the outer shaft portion b. In the outer portion a of the shaft, the diameter A of the shaft 2 is formed smaller than the inner diameter of the roller 1 so as to form a clearance fit. Further, in the shaft inner portion b, the shaft 2 is formed so as to have a diameter B that is large enough to allow an interference fit.

A mounting recess 3 is provided on the shaft 2 at the outer portion a of the shaft, and a key 4 is mounted in the mounting recess 3. The key 4 is a so-called parallel key. A keyway 5 similar to the conventional one is provided in the inner diameter of the roller 1.
A bolt 8 is screwed onto the end surface of the shaft 2 via a washer 7, and the roller 1 is fixed.

In this case, a stopper 6 is attached to the shaft 2.
(See FIG. 2A) is omitted. This is because the interference of the shaft inner portion b prevents the roller 1 from moving in the shaft direction.

When the roller 1 is mounted on the shaft 2 with the key 4, the one end of the roller 1 is fitted to the end of the outer shaft portion a (FIG. 1 (a)). Dashed line). At this time, it is necessary to match the phases of the key 4 and the key groove 5, but it is recognized that the fitting of the shaft 2 and the roller 1 is a clearance fit, and that the key 4 is located near the shaft end, so that the position is recognized. This facilitates phase matching.

When the roller 1 is pushed in after the key 4 is fitted into the key groove 5, it reaches the shaft inner portion b and receives a large resistance. Here, when a required pressure input is applied to the roller 1, the roller 1 is tightly fitted to the shaft inner portion b. Due to this interference fit, no gap is created between the shaft 2 and the roller 1. After the press-fitting is completed, the bolt 8 is screwed to the end face of the shaft 2 via the washer 7 to prevent the roller 1 from being removed.

The bearing device is of the above-described conventional case (FIG. 2).
(See (a)).

In the above embodiment, the combination structure of the roller 1 and the shaft 1 has been described, but a rotating body such as a pulley or a gear can be used instead of the roller 1.

[0018]

As described above, according to the present invention, in a key coupling structure of a shaft and a rotating body in a rotating body with a shaft, a fitting portion between a key and a key groove is provided at an outer portion of the shaft, and the outer portion of the shaft is provided. Since the fitting of the shaft and the rotating body is made with a clearance fit, the phase matching between the key and the key groove at the time of assembling the shaft and the rotating body becomes easy. Further, since the fitting between the shaft and the rotating body in the inner portion of the shaft is performed by interference fit, there is no gap in the fitting surface between the shaft and the rotating body, and the problem of shaft wear can be solved.

[Brief description of the drawings]

FIG. 1A is a sectional view of an embodiment.

FIG. 1 (b) is a cross-sectional view taken along line bb in FIG. 1 (a).

FIG. 1 (c) is a cross-sectional view taken along line cc in FIG. 1 (a).

FIG. 2A is a sectional view of a conventional example.

FIG. 2B is a cross-sectional view taken along the line bb in FIG.

[Explanation of symbols]

 Reference Signs List 1 roller 2 shaft 3 mounting recess 4 key 5 key groove 6 stopper 7 washer 8 bolt 9 housing 10 rolling bearing 11 retaining ring 12 wave spring

Claims (2)

[Claims] 1. A key is fixed to one end of a shaft, a rotating body having a key groove is inserted through the shaft, the key is fitted into the key groove, and the rotating body is connected to one end of the shaft. In the rotating body with the shaft fixed to the shaft, the fitting range of the shaft and the rotating body is divided into an outer portion of the shaft deviated to the shaft end side and an inner portion of the shaft inward thereof, and the fitting of the key and the key groove is performed. The part is provided in the outer part of the shaft, the fitting of the shaft and the rotating body in the outer part of the shaft is a clearance fit, and the fitting of the shaft and the rotating body in the inner part of the shaft is an interference fit. A rotating body with a shaft. 2. The rotating body with shaft according to claim 1, wherein the key is a parallel key, and the key groove is formed over the entire width of the rotating body.