JPH051027U - Shaft coupling - Google Patents

Abstract

(57) [Summary] [Structure] The shaft coupling 1 is provided with a round hole 2 corresponding to the motor shaft diameter and a flat surface portion 4 that comes into contact with the flat surface processed portion of the motor shaft. [Effect] By providing the flat portion 4 on the shaft coupling 1, the shaft coupling 1 can be correctly attached to the motor shaft at the flat portion 4. As a result, the installation work becomes extremely easy,
The burden on the worker can be reduced and the work time can be shortened.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a shaft coupling that can be accurately positioned on a motor shaft.

[0002]

[Prior Art]

 FIG. 5 is an exploded perspective view of a conventional shaft coupling and a motor shaft. For example, in a magnetic tape device, a reel hub 100 relating to a magnetic tape is attached to a motor shaft 103 of a reel motor 102 via a cylindrical shaft coupling 101.

The motor shaft 103 is formed with two plane processing portions 104 which are orthogonal to each other by cutting, and the shaft coupling 101 is fitted therein and fixed by setscrews 105, 105. The shaft coupling 101 has a reel hub. The reel hub 100 is fixed by mounting 100 and screwing screws 107 and 107 into the taps 106 and 106 of the shaft coupling 101.

FIG. 6 is a mounting view of a conventional shaft coupling, in which the set screws 105, 105 firmly press the flattened portions 104, 104 of the motor shaft to firmly fix the shaft coupling 101 to the motor shaft 103. To be done.

FIG. 7 is a view of another type of conventional shaft coupling. This shaft coupling 101 has a slit portion 111 formed by cutting, and by tightening a bolt 112, the gap of the slit portion 111 is narrowed. The shaft coupling 110 is fixed to the motor shaft 113. The shaft joint 110 does not require special machining (planar machining, key groove, etc.) on the motor shaft 113, and is therefore preferably used for small-diameter motor shafts.

Since the motor shafts 103 and 113 of the reel motor are generally small in diameter, key groove processing is not suitable and is not often adopted.

[0007]

In the case of the shaft coupling 101 of FIG. 6, it is necessary to make the set screws 105, 105 perpendicular to the flattened portions 104, 104 while rotating and adjusting the shaft coupling 101 with respect to the motor shaft 103. There is. If the set screws 105, 105 are set in an incorrect state, the shaft joint 101 will rattle during use.

However, since the above-mentioned mounting work is visually performed, the accuracy is not high, and human-made work mistakes easily occur.

On the other hand, the shaft coupling 110 shown in FIG. 7 is easy to mount, but has an unbalanced shape, and therefore has a drawback that the surface runout of the reel hub 100 (FIG. 5) becomes large.

[0010]

[Means for Solving the Problems]

 In order to eliminate these inconveniences, the present invention is characterized in that the shaft coupling is provided with a round hole corresponding to the motor shaft diameter and a flat surface portion corresponding to the flat surface processed portion of the motor shaft.

[0011]

[Action]

 The shaft joint can be correctly set on the motor shaft by applying the flat surface part of the shaft joint to the flat part of the motor shaft.

[0012]

【Example】

 Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 is a plan view of a shaft coupling according to the present invention, and FIG. 2 is a sectional view taken along line 2-2 of FIG.

As shown in FIG. 2, the shaft coupling 1 has a circular hole 2 corresponding to the motor shaft diameter, which is reamed to a height of about 4/5 from the bottom (A in the figure) as shown in FIG. A rectangular hole 3 is formed up to about 1/4 height (B in the figure), and this rectangular hole 3 is eccentric to the right side of FIG. 1 as shown in FIG.

As a result, one side of the long side of the rectangular hole 3 partially overlaps the round hole 2. This one side is referred to as the flat portion 4 of the shaft coupling. The shaft joint 1 is additionally provided with setscrew taps 5 and 5 and reel hub taps 6 and 6.

The operation of the shaft coupling having the above structure will be described. FIG. 3 is a diagram showing the mounting of the shaft coupling according to the present invention. As in the prior art, the motor shaft 11 of the reel motor 10 is provided with two plane processing parts 12, 12 orthogonal to each other. The shaft coupling 1 of the present invention may be fitted to this, and the set screws 13 and 13 may be tightened.

FIGS. 4 (a) and 4 (b) are views of the shaft joint mounting of the present invention, in which the shaft joint 1 is fitted to the motor shaft 11 as indicated by an arrow. At this time, if the flat surface portion 4 is not aligned with the flat surface processed portion 12, the fitting is not completed. The fitting is completed only when the flat surface portion 4 follows the flat surface processed portion 12 as shown in FIG. 4A, and the set screws 13 and 13 may be tightened in FIG. 4B.

Since the set screws 13 and 13 are oriented vertically to the flat surface processed portions 12 and 12, the tightening effect is sufficient.

In the present embodiment, the above-mentioned flat surface portion 4 is provided in one step at the uppermost portion, but the formation position and the number are arbitrary, and the point is that the structure cannot be fitted unless the mounting angles match. ..

The shaft coupling 1 of the present invention is suitable for a reel motor of a magnetic tape device, but may be applied to other motors.

[0020]

[Effect of the device]

 As described above, according to the present invention, since the shaft joint is provided with the flat portion, the shaft joint can be correctly attached to the motor shaft at the flat portion. As a result, the installation work becomes extremely easy, the burden on the worker is reduced, and the work time can be shortened.

[Brief description of drawings]

FIG. 1 is a plan view of a shaft coupling according to the present invention.

FIG. 2 is a sectional view taken along line 2-2 of FIG.

FIG. 3 is a diagram showing a mounting procedure of a shaft coupling according to the present invention.

[Fig. 4] Mounting diagram of the shaft joint of the present invention

FIG. 5 is an exploded perspective view of a conventional shaft coupling and a motor shaft.

[Figure 6] Conventional shaft coupling installation diagram

FIG. 7 is a diagram of another conventional shaft coupling of another type.

[Explanation of symbols]

1 ... Shaft coupling, 2 ... Round hole, 4 ... Plane part, 11 ... Motor shaft,
12 ... Plane processing part.

Claims (1)

[Claims for utility model registration] Claims: 1. A shaft coupling fitted to a motor shaft having a flattened portion engraved, the shaft joint being provided on the flattened portion together with a round hole corresponding to the motor shaft diameter. A shaft coupling, which is provided with a flat surface portion that abuts.