JPS6214418Y2 - - Google Patents

Description

[Detailed explanation of the idea]

This invention relates to a coupling that is fitted and fixed to an end of a shaft by shrink fitting or the like and engaged with a mating member to enable transmission of torque. In various mechanical devices such as reducers and rolling mills, in order to transmit torque between the drive shaft and driven shaft,
In many cases, a coupling ring is fitted and fixed to one or both shaft ends by shrink fitting or the like. In this case, as shown in FIG.
It is assumed that d-Δd has . For this reason, the axially outer end surface 2 of the shrink-fitted coupling ring 1 is distorted by the amount of deformation δ as shown in FIG. When it comes into contact with the axially outer end surface of (1), a gap corresponding to the amount of deformation δ is generated, the mounting accuracy is reduced, and the torque transmission function is reduced. This deformed shape differs somewhat depending on the shape of the coupling 1, but generally it is a concave conical surface with its apex located on the axis as shown in FIG. 2, or a sloped surface with an inclined end surface in the axial direction (not shown). The same result as described above occurs also when the mating surface between the shaft end and the coupling ring is a tapered surface as shown by imaginary lines 1a and 2a in FIG. This amount of deformation δ increases proportionally as the interference margin Δd increases, resulting in poor precision of the axial outer end surface that comes into contact with the mating member. In order to ensure this precision, after shrink fitting, There is an inconvenience that the end face must be manually corrected, and this work requires a lot of effort. The purpose of this invention is to eliminate the need for modifying the axially outer end surface of the coupler that is fitted and fixed to the shaft end by shrink fitting, etc. in the above-mentioned coupling. It is characterized in that it is formed into a shape that predicts the occurrence of strain deformation, and after shrink fitting, the end face becomes a highly accurate plane in the direction perpendicular to the axis due to the strain deformation. Next, this invention will be described in detail with reference to the embodiment shown in FIGS. 3 and 4. The hole diameter d- is set so as to have an appropriate interference distance Δd for shrink fitting etc. with respect to the diameter d of the shaft end of the shaft 10.
In the coupling ring 11 where Δd is set, an axial outer end surface 12 is in contact with an axial outer end surface of a mating member (not shown) that engages to enable torque transmission.
A conical surface or an inclined surface protruding in the axial direction with an apex located on the axis having an appropriate inclination angle α such that the strain deformation after shrink fitting is predicted, It is designed to be fitted and fixed to the end of the shaft. The inclination angle α is set by predicting the amount of deformation δ due to shrink fitting, but there is a proportional relationship between the offset Δd and the amount of deformation δ as shown in the table below and FIG. 5. I found out.

[Table] From the table and Fig. 5, calculate the offset Δd of the shaft diameter d.
When it is set to 0.1 to 0.2%, the inclination angle α becomes 1' to 6' as shown in FIG. In addition, samples A~ shown in the table above
The dimensions of the coupling E are: outer diameter D = 600
mm, shaft diameter d = 370 mm, joint length 130 mm,
Although the shape of the hole that fits with the shaft end is cylindrical, the same configuration can be achieved even if the hole is a tapered hole. In addition, samples F to H shown in the table have tapered holes with the ratio Δd/d of the shaft diameter d and the offset Δd constant and other dimensions of the couplings changed, which are similar to the cylindrical hole couplings. , when the offset Δd is 0.1 to 0.2% of the shaft diameter d, the inclination angle α is 1' to 6'. However, since the value of α changes even though Δd/d is constant, there is no proportional relationship between Δd/d and α between couplings with different dimensions. I understand. This idea is based on the above experimental results, predicts the amount of deformation of the axial outer end surface after shrink fitting, and transforms the axial outer end surface into a conical or sloped surface that becomes a plane perpendicular to the axis due to the deformation. The outer end surface in the axial direction is processed before the shrink fitting is performed. Therefore, there is no need to modify the outer end surface in the axial direction of the coupling after shrink fitting, and the relationship with the mating member is improved. In this case, the attachment accuracy of the contact surface portion to the axially outer end surface can be maintained with high accuracy, and a functional deterioration of the torque transmission mechanism can be prevented. In addition, with normal couplings, the interference for shrink fitting is 0.1%<Δd/d<0.2% relative to the shaft diameter.
Since the angle of inclination is 1′<α<6′,
The angle of inclination α can be set at an appropriate angle between 1' and 6' depending on the angle of interference, making it extremely easy to take dimensions during processing. In particular, in the case of cylindrical hole couplings (samples A to E in the table) having the dimensions as described above, the normal interference margin is 0.14%<Δd/d<0.19%.
Therefore, the inclination angle is narrowed down to the range 4'<α<5.5', and there is a proportional relationship as shown in Figure 6, so
It has the feature of making it easier to set dimensions during processing.

[Brief explanation of the drawing]

Figures 1 and 2 are longitudinal cross-sectional views showing conventional examples, and Figure 3 is a longitudinal sectional view showing a conventional example.
4 is a vertical sectional view showing an embodiment of this invention,
FIG. 5 is a diagram showing the relationship between the offset and the shaft diameter, and FIG. 6 is a diagram showing the relationship between the ratio of the offset and the shaft diameter and the inclination angle. 10...shaft, 11...coupling, 12...
Axial outer end surface.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In a coupler that is fitted and fixed to the shaft end with a suitable degree of interference by shrink fitting, etc., the coupling is applied to the axially outer end surface of the mating member that engages to enable transmission of torque. The outer end surface in the axial direction that is in contact with the shaft end is formed into a conical surface or sloped surface with an appropriate inclination angle that becomes a plane in the direction perpendicular to the axis due to the strain deformation caused by being fitted and fixed to the shaft end. A cup ring. (2) The coupling according to claim (1), wherein the inclination angle is in the range of 1' to 6' when the interference range is in the range of 0.1 to 0.2% of the shaft diameter.