JPH0747614Y2 - Spline shaft coupling - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a spline shaft coupling.

[Conventional technology]

For example, in Japanese Utility Model Publication No. 54-38419 and Japanese Utility Model Application Publication No. 57-24324, a first shaft and a second shaft, each of which has spline teeth at the ends, are coaxially connected with the ends facing each other. There is disclosed a spline shaft coupling. Further, in Japanese Utility Model Publication No. 54-38419, further, a seal ring-shaped elastic member is interposed in a radial gap between the spline shaft joint and the first shaft and the second shaft. It is described that the rattling between the second shaft and the spline shaft coupling is mitigated. Further, in Japanese Utility Model Laid-Open No. 57-24324, springs are arranged between both ends of the spline shaft coupling and the outer portions of the first shaft and the second shaft, and similarly, the first shaft and the second shaft are provided. It is described that the rattling between the shaft and the spline shaft coupling is reduced.

[Problems to be solved by the device]

The spline shaft coupling transmits rotation between the first shaft and the second shaft while allowing relative movement in the axial direction.
For this reason, spline teeth extending in the axial direction are provided respectively, and there is a backlash in meshing the spline teeth. However, since the backlash of spline shaft couplings is quite large, noise during rotation operation is large,
There is a problem that the tooth surface is easily worn. Since the techniques described in both of the above publications do not regulate the relative movement in the circumferential direction between the spline shaft coupling and the first shaft and the second shaft, noise due to collision of tooth surfaces is reduced. Can not do it. Further, if the backlash is reduced, the noise due to the collision of the tooth surfaces can be reduced, but the degree of freedom of relative movement between the spline shaft coupling and the first shaft and the second shaft becomes small, and high. Machining accuracy is required.

An object of the present invention is to provide a spline shaft coupling that can reduce noise and wear.

[Means for Solving the Problems]

A spline shaft coupling according to the present invention is a spline shaft coupling that coaxially connects a first shaft and a second shaft, each of which has spline teeth at the ends, with the ends facing each other, and has a spline inner surface. A cylindrical central block provided with teeth and cylindrical end blocks provided on both sides of the central block and provided with spline teeth on an inner surface thereof, and the ends of the first shaft and the second shaft are formed. A portion extending from the end block into the central block, the spline teeth of the first axis and the second axis arranged to engage the spline teeth of the end block and the central block, respectively. Further, an elastic means for urging the central block and the end block relatively in the circumferential direction is provided.

[Action]

In the above structure, the spline teeth of the first shaft and the second shaft are engaged with the spline teeth of the end block and the center block, respectively, and the center block and the end block are relatively circumferentially arranged by the elastic means. Being biased, the spline teeth of these central and end blocks circumferentially sandwich the spline teeth of each of the first and second shafts, resulting in substantially zero backlash during operation. It can reduce noise and wear.

〔Example〕

 Hereinafter, description will be given with reference to the drawings.

Referring to FIG. 1, the spline shaft coupling is formed from a cylindrical central block 10 and similarly cylindrical end blocks 12 and 14 located on opposite sides of the central block 10. The central block 10 and the end blocks 12 and 14 are provided with involute spline teeth T having the same specifications on their inner surfaces. Drive shaft
An involute spline tooth t is provided at an end 16a of the shaft 16. The end 18a of the driven shaft 18 is also provided with similar involute spline teeth t. This spline shaft coupling connects the drive shaft 16 and the driven shaft 18 coaxially with their ends 16a, 18a facing each other. In the exemplary embodiment, drive shaft 16 is supported by bearings 20 and is provided with lock nuts 22. The driven shaft 18 is supported by a bearing 24.

Referring to FIG. 1 to FIG. 3, the central block 10 and the end blocks 12 and 14 are loosely fitted to each other. Therefore, both ends of the central block 10 have outer surfaces removed. The outer surface small-diameter fitting portion 26 is formed, and the end portions of the respective end blocks 12 and 14 have the inner surface large-diameter fitting portion 28 with the inner surface removed.
Has become. The outer surface of the central block 10 has a small diameter fitting part.
26 is formed at the outermost end, and the inner portion thereof is an annular groove portion 30 in which the outer surface is further deleted to form an annular groove. The combined length of the outer surface small diameter fitting portion 26 and the annular groove portion 30 is substantially equal to the length of the inner surface large diameter fitting portion 28 of each end block 12, 14.
An annular space is formed between the inner surface of the inner surface large diameter fitting portion 28 and the outer surface of the annular groove portion 30.

Referring to FIG. 3, in the annular space, axially extending protrusions 32 and 34 are provided on the inner surface of the inner surface large diameter fitting portion 28 and the outer surface of the annular groove portion 30, respectively, and the elastic tension ring 36 is formed. It is inserted concentrically. The tension ring 36 has an open end, which is the end block 12,14.
32 and the protrusions formed on the central block 10
By engaging with 34, the projection 32 and the projection 34 (the central block 10 and the end blocks 12 and 14) are relatively biased in the circumferential direction as indicated by the arrows. In addition, the outer surface small-diameter fitting portion 26 at the outermost end of the central block 10 has the outer surface small-diameter fitting portion 26 when assembled.
Each end block when inserting 26 into inner diameter large diameter fitting part 28
Slits 38 (first for passing the projections 32 of 12, 14)
FIG. 2, FIG. 2) are provided. On the contrary, the protrusion 32
The end blocks 12 and 14 cannot be separated from the central block 10 unless the slits 38 and the slits 38 are aligned.

Further, as shown in FIG. 1, coil springs 40 and 42 are arranged between the end block 12 and the driven shaft 18, and between the end block 14 and the drive shaft 16, respectively. By axially pressing the blocks 12, 14 from both sides onto the central block 10, the axial integration of these three,
Also, the displacement of the spline shaft joint with respect to the drive shaft 16 and the driven shaft 18 is prevented. Coil spring 4
Other elastic means such as bellows may be used instead of 0,42 as well. In the embodiment, the coil spring 40 is provided so as to engage with the inner race of the bearing 24 which rotates integrally with the driven shaft 18, and the coil spring 42 is provided so as to engage with the lock nut 22.

Referring to FIG. 1, the spline teeth T of the central block 10
Is formed up to the inner surface of the outer surface small diameter fitting portion 26 at the outermost end, and extends substantially continuously with the spline teeth T of the end blocks 12 and 14. The end 16a of the drive shaft and the end 18a of the driven shaft extend from the end blocks 12,14 into the central block 10, respectively, and the spline teeth t of the drive shaft 16 and the driven shaft 18 respectively end blocks 12,14. And the central block 10 are arranged to engage together with the spline teeth T.

Therefore, the spline teeth T of each of the end blocks 12 and 14 and the central block 10 are urged in the circumferential direction by the tension ring 36, and as shown in FIG. 4, the drive shaft 16 and the driven shaft 16 are driven.
The 18 spline teeth t are sandwiched from both sides in the circumferential direction. Therefore, the backlash between each spline tooth of the spline shaft coupling and each spline tooth of the drive shaft 16 and the driven shaft 18 becomes substantially zero, and noise and wear can be reduced. Therefore, it is not necessary to make the processing accuracy of the spline shaft joint unnecessarily strict, and if the biasing force of the tension ring 36 is excluded, there will be a loose meshing relationship with backlash, and the axes of the drive shaft 16 and driven shaft 18 will shift Even if it is, it can be connected without bending the shaft,
It is extremely effective in preventing damage to the bearings in high-speed rotating bodies such as gas turbines without increasing shaft vibration.

[Effect of device]

As described above, the spline shaft coupling according to the present invention is formed of the central block and the end blocks arranged on both sides thereof, and the ends of the first shaft and the second shaft to be connected are respectively connected to the ends. Extending from the partial block into the central block and the spline teeth of the first axis and the second axis are arranged to engage together with the spline teeth of the end block and the central block, respectively Since the elastic means for urging the end block relative to each other in the circumferential direction is provided, the central block and the end block are urged relative to each other in the circumferential direction by the elastic means so that the first shaft and the second block The effect of being able to reduce noise and wear by sandwiching each spline tooth of the shaft in the circumferential direction and making the backlash substantially zero.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing the construction of a spline tooth shaft coupling according to the present invention, FIG. 2 is a partially enlarged view of FIG. 1, and FIG.
FIG. 4 is a cross-sectional view taken along line III-III in the drawing, and FIG. 4 is an explanatory view for explaining meshing of spline teeth. 10 …… Center block, 12,14 …… End block, 16,18…
… Shaft, 26 …… Outer surface small diameter fitting section, 28 …… Inner surface large diameter fitting section,
30 …… annular groove, 32,34 …… projection, 36 …… tension ring, 40,42 …… coil spring.

Claims (1)

[Scope of utility model registration request] 1. A first device having spline teeth at each end thereof.
Is a spline shaft coupling that coaxially connects the shaft and the second shaft with their ends facing each other, and is a cylindrical central block having spline teeth on its inner surface, and is arranged on both sides of the central block. A cylindrical end block having spline teeth on its inner surface, wherein the ends of the first and second shafts extend from the end block into the central block, respectively. And second axis spline teeth are arranged to engage with the spline teeth of the end block and the center block, respectively, and further urge the center block and the end block relatively in the circumferential direction. Spline shaft coupling provided with elastic means.