JP2631266B2 - Telescopic shaft coupling - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shaft coupling for connecting a rotating shaft on a driving side and a rotating shaft on a driven side, and more particularly, to a telescopic shaft joint whose overall length changes in accordance with a change in the distance between the shafts.

[0002]

2. Description of the Related Art FIG. 5 is a side sectional view showing an example of a conventional expansion joint. 1 is a first cross joint in which a coupling 2 is fixed to one swing end, 3 is a spline shaft fixed to the other swing end of the first cross joint, 4 is a flange 5 at one swing end. The fixed second cross joint 6 is a spline sleeve fixed to the other swinging end of the second cross joint 4.

The spline shaft 3 is slidably fitted in a spline hole 6a of the spline sleeve 6, and is fixed to the spline sleeve 6 in the rotation direction. Also,
An insertion hole 3a is opened in the tip end surface of the spline shaft 3, and a metal coil spring 8 and a guide rod 7 which is vertically installed on the bottom surface of the spline hole 6a and inserted through the coil spring 8 are inserted into the insertion hole 3a. ing.

[0004] An oval hole (not shown) is opened at the end face of the coupling 2, and an end of a driven shaft (not shown) of a rolling roll having an oval cross section is inserted into the oval hole. Thus, the driven shaft is fixed to the coupling 2 in the rotation direction. Further, a flange 10 of a drive shaft 9 is fastened and fixed to the flange 5 by a bolt, a nut or the like.

When the rolling roll is replaced, the driven shaft is usually pulled out of the coupling 2 with the flange 5 and the flange 10 fixed. Next, the coil spring 8 is compressed in advance and the driven shaft of a new rolling roll is inserted into the coupling 2, or the driven shaft is inserted into the coupling 2 to compress the coil spring 8. Here, in a state where the rolling roll is set at a predetermined position, the coil spring 8 is held in a state where the coil spring 8 is compressed by the driven shaft inserted into the coupling 2.
And the initial position of the spline shaft 3 are adjusted in advance.

Since the coil spring 8 is compressed when the driven shaft of the rolling roll is connected to the drive shaft 9, a thrust force in the direction of arrow A always acts on the spline shaft 3 due to the repulsive force of the coil spring 8. In the expansion joint, the distance between the coupling 2 and the flange 5 is equal to the distance between the driven shaft and the drive shaft 9, and the coupling 2 elastically contacts the driven shaft. Also, the expansion joint has an arrow B in which the position of the driven shaft of the rolling roll is substantially perpendicular to the arrow A direction.
Even if the first cross joint 1 and the second cross joint 4 are displaced in the direction, the rotational force can be transmitted because the first cross joint 1 and the second cross joint 4 swing.

Further, when transmitting the rotational force, the coupling 2
Is always in elastic contact with the driven shaft, so that the driven shaft can be prevented from dropping off from the coupling 2 even if the rolling roll is displaced by vibration or the like.

[0008]

However, in the above-described expansion joint, a coil spring 8 having a relatively long free length must be used in order to generate a sufficient thrust force. For this reason, the coil spring 8 itself becomes considerably heavy.

Furthermore, in order to smoothly expand and contract the coil spring 8, the coil spring 8 and the guide rod 7
Play is required between the coil spring 8 and the inner circumferential surface of the insertion hole 3a.
For this reason, the diameter of the guide rod 7 is designed to be slightly smaller than the inner diameter of the coil spring 8, and the inner diameter of the insertion hole 3 a is designed to be slightly larger than the outer diameter of the coil spring 8. With this design, the coil spring 8 can be smoothly expanded and contracted. However, since there is a gap between the guide rod 7 and the insertion hole 3a, the coil spring 8 can be expanded and contracted in a compressed state. It may bend with respect to the direction.

The heavy metal coil spring 8 is inserted into the insertion hole 3.
By curving in a, the weight distribution of the expansion joint becomes unbalanced with respect to the center of rotation. For this reason,
The expansion joint using the coil spring 8 as the elastic material is liable to generate flexural vibration during rotation, and the heavy coil spring 8 is arranged at the rotating portion, so that it is difficult to increase the dangerous rotation speed.

Further, since the above-mentioned expansion joint has a structure in which a deep insertion hole 3a is formed in the spline shaft 3 and the guide rod 7 is fixed in the spline hole 6a, processing is difficult and cost is reduced. There is also the problem of becoming expensive.

SUMMARY OF THE INVENTION An object of the present invention is to provide an expansion joint capable of generating a sufficient thrust force while achieving a high-precision balance of the weight distribution with respect to the center of rotation in order to solve the above problems. .

[0013]

In order to solve the above-mentioned problems, an expansion joint according to claim 1 of the present invention comprises a spline sleeve connected to a first rotating shaft and a spline sleeve connected to a second rotating shaft. A spline shaft slidably fitted into the spline sleeve, a partition plate fixed in the spline sleeve at a position facing a tip end surface of the spline shaft, and connected to the spline shaft with the partition plate interposed therebetween. A first holding plate fixed to the holding plate moving with the spline shaft in the spline sleeve and the front end surface of the partition plate and the spline shaft, and elastically deformable between the separation plate and the front end surface of the spline shaft. An elastic rubber, a second elastic rubber fixed to the partition plate and the holding plate, respectively, and elastically deformable between the partition plate and the holding plate. Wherein the first number of the elastic rubber and the second elastic rubber, shape and expansion joint, characterized in that the elastic modulus were equal to each other.

Further, the expansion joint according to the second aspect is provided with a first expansion joint.
A spline sleeve connected to the first rotating shaft via a cross joint, and a spline shaft connected to the second rotating shaft via a second cross joint and slidably fitted into the spline sleeve. A partition plate fixed in the spline sleeve at a position facing the tip end surface of the spline shaft, a holding plate connected to the spline shaft across the partition plate, and moving together with the spline shaft in the spline sleeve; A first elastic rubber fixed to the partition plate and the tip end surface of the spline shaft and elastically deformable between the partition plate and the tip end surface of the spline shaft; and fixed to the partition plate and the holding plate, respectively. A second elastic rubber elastically deformable between the partition plate and the holding plate;
The number, shape and elastic modulus of the elastic rubber and the second elastic rubber are made equal to each other.

[0015]

According to the expansion joint of the first aspect, the spline shaft moves in the direction of extension or contraction in the sliding direction with respect to the spline sleeve, and one of the first elastic rubber and the second elastic rubber expands. Direction, the other elastically deforms in the contraction direction, one of the first elastic rubber and the second elastic rubber acts on the spline shaft in the extension direction, and the other acts on the spline shaft in the contraction direction. Further, even when the spline shaft moves in any of the extension direction and the contraction direction, the elastic force according to the amount of movement acting on the spline shaft becomes equal.

Further, according to the expansion joint according to the second aspect, the spline shaft moves in the direction of extension or contraction in the sliding direction with respect to the spline sleeve, and one of the first elastic rubber and the second elastic rubber. Are elastically deformed in the extension direction and the other is elastically deformed in the contraction direction, and one of the first elastic rubber and the second elastic rubber exerts an elastic force in the extending direction on the spline shaft, and the other elastic force in the contracting direction on the spline shaft. When the spline shaft moves in any of the extension direction and the contraction direction, the elastic force according to the amount of movement acting on the spline shaft becomes equal, and the first cross joint and the second cross joint The joint allows the rotation shaft to swing in a direction orthogonal to the sliding direction of the spline shaft.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side sectional view showing one embodiment of an expansion joint of the present invention, and FIG. 2 is a cross-sectional view showing a main part of the expansion joint of this embodiment, and corresponds to the members described with reference to FIG. The same reference numerals are given to the members, and the description is omitted. 1
1 is a partition plate fixed in the spline hole 6a, 12 is a connection bolt screwed into the tip end surface of the spline shaft 33 and inserted through the through hole 11a at the center of the partition plate 11, and 13 is the partition plate 11 sandwiched by the connection bolt 12. The holding plates 20 and 21 connected to the spline shaft 33 are a first rubber mounting member and a second rubber mounting member respectively constituted by a substantially cylindrical elastic rubber 22 and a pair of mounting plates 23.

As the elastic rubber 22, for example, commercially available products such as Evermount EA and EB (trade name) manufactured by Bridgestone Corporation can be used. Further, the pair of mounting plates 23 are fixed to both end surfaces of the elastic rubber 22, respectively, and screws 23a are implanted on the surface opposite to the fixed side surface as shown in the perspective view of FIG. Here, the first rubber mount member 20 and the second rubber mount member 21 use an elastic rubber 22 having the same shape and elastic coefficient.

The first rubber mount member 20 has one of the mounting plates 23 at a position sandwiched between the tip end surface of the spline shaft 33 and the partition plate 11.
3 and the other mounting plate 23 is fixed to the partition plate 11. In the second rubber mount member 21, one mount plate 23 is fixed to the partition plate 11 at a position where the second rubber mount member 21 is sandwiched by the partition plate 11 and the clamp plate 13, and the other mount plate 23 is fixed to the clamp plate 13. .

In the expansion joint of the present embodiment, similarly to the conventional expansion joint, the first rubber mount member is driven by the driven shaft inserted into the coupling 2 with the rolling roll set at a predetermined position. The thickness of the rubber mount members 20 and 21 and the spline shaft 33 are maintained so that the second rubber mount member 20 and the second rubber mount member 21 are maintained in an elastically deformed state.
Is adjusted in advance.

The rubber mount members 20 and 21 are elastically deformed when the driven shaft of the rolling roll and the drive shaft 9 are connected, so that the spline shaft 33 always has a thrust in the direction of arrow A due to the repulsive force of the rubber mount members 20 and 21. Since a force is applied, in the expansion joint, the distance between the coupling 2 and the flange 5 becomes equal to the distance between the driven shaft and the drive shaft 9, and the coupling 2 elastically contacts the driven shaft.

In the expansion joint, the first cross joint 1 and the second cross joint 4 swing even if the position of the driven shaft of the rolling roll is displaced in the direction of arrow B substantially perpendicular to the direction of arrow A. , Rotational force can be transmitted. Further, since the coupling 2 is always in elastic contact with the driven shaft at the time of transmitting the rotational force, the driven shaft can be prevented from falling off from the coupling 2 even if the rolling roll is displaced by vibration or the like. At this time, the rubber mount members 20 and 21
Since it is possible to increase the elastic coefficient per weight as compared with a coil spring formed of metal or the like, a large thrust force can be applied to the spline shaft 33 even with a slight deformation in the axial direction.

Also, regardless of whether the spline shaft 33 slides in the extending direction or the contracting direction, the first rubber mount member 20 and the second rubber mount member 21 are symmetrical, that is, one side. Are elastically deformed in the elongation direction and the other is in the contraction direction, so that the elastic rubber 22 alone is not affected by the properties of the elastic rubber 22 alone.
The elastic force according to the amount of movement acting on the spline shaft 33 becomes equal even in the contraction direction.

Next, a method for assembling the expansion joint according to the present embodiment will be described with reference to FIGS. The spline sleeve 6, the second cross joint 4, and the connecting portion are formed with a flange 6b and a flange 4a, respectively, and the spline sleeve 6 and the second cross joint 4 are fastened by the bolt 15 between the flange 6b and the flange 4a. Are assembled together.

First, one screw 23a of the first rubber mount member 20 is screwed into a screw hole opened on the tip end surface of the spline shaft 33, and the first rubber mount member 20 is fixed to the spline shaft 33. The spline shaft 33 is inserted into the spline sleeve 6. At this time, the spline sleeve 6 and the second cross joint 4 are disassembled and the bottom of the spline sleeve 6 is kept open.

The portion near the bottom of the spline sleeve 6 has a larger diameter than the portion where the inner spline is formed, and a step is formed at the boundary between the vicinity of the bottom and the portion where the inner spline is formed.

The other screw 2 of the first rubber mount member 20 is inserted by inserting the partition plate 11 into the spline sleeve 6 at a fixed position in contact with the step shape through the opening at the bottom.
3 a is inserted through a through hole formed in the partition plate 11, and the first rubber mount member 20 is held between the tip end surface of the spline shaft 33 and the partition plate 11. And the partition plate 1
The first rubber mount member 20 is fixed to the partition plate 11 by screwing the nut 16 to the screw 23a protruding from the first.

Next, one end of the connection bolt 12 having a thread formed near both ends is inserted through a through hole 11 a penetrating the center of the partition plate 11 to form a screw hole opened at the center of the tip end surface of the spline shaft 33. Screw it. A nut 1 for positioning the holding plate 13 is provided at the other end of the connecting bolt 12.
4, and one screw 23 a of the second rubber mount member 21 is screwed into a screw hole formed in the partition plate 11. At this time, the end surface of the nut 14 for positioning is aligned with the bottom surface of the second rubber mount member 21.

Then, the holding plate 13 having a through hole formed at the center and at a position facing the screw 23a is fitted at a position where it comes into contact with a positioning nut 14 screwed to the connection bolt 12, and the holding plate 13 is fixed. And fixed by a nut 14 for use. The second rubber mount member 21 is fixed to the holding plate 13 by screwing the nut 16 to a screw 23 a protruding from the holding plate 13.

Finally, the partition plate 11 is inserted into the spline hole 6a.
Is inserted, and the second cross joint 4 is fixed to the spline sleeve 6 to complete the assembly. At this time, the end surface of the sleeve 17 on the insertion side contacts the partition plate 11, and the other end surface contacts the inner surface of the second cross joint 4, and is fixed by the second cross joint 4.

Here, the thickness of the elastic rubber 22 and the partition plate 1
By changing the fixed position 1 and adjusting the distance L from the tip of the spline shaft 33 to the holding plate 13 shown in FIG. 2, the initial position of the spline shaft 33 in the axial direction can be arbitrarily set.

FIG. 4 is an axial front view of the partition plate and the rubber mount member of this embodiment. The six first rubber mount members 20 are arranged at equal distances and at equal intervals (60 ° intervals) with respect to the rotation center C of the joint.
Further, the six second rubber mount members 21 are arranged at positions that are 30 ° out of phase with the first rubber mount member 20. Here, the rubber mount members 20 and 21
May be arranged so as to be equidistant and equidistant from the rotation center C of the joint, and the number of used splines is increased or decreased according to the diameter of the spline shaft 33 and the required elastic coefficient.

In the expansion joint of the present embodiment, the rubber mount member 2 can be mounted without changing the diameter of the elastic rubber 22.
By increasing or decreasing the number of 0 and 21, the elastic coefficient corresponding to the thrust force acting on the spline shaft 33 can be easily adjusted. Since the weight distribution with respect to the center of rotation can be prevented from being unbalanced by the rubber mount members 20 and 21 by arranging the weight distribution so as to be symmetrical, the expansion and contraction of the expansion joint during rotation can be prevented. Can be suppressed. In addition, since the elastic rubber 22 generally has a large elastic coefficient with respect to weight as compared with a metal coil spring, it is possible to reduce the weight of the expansion / contraction shaft joint, and as compared with a shaft joint using a metal coil spring. The dangerous rotation speed can be increased.

[0034]

As described above, according to the first aspect of the present invention,
According to the expansion joint of claim 2, the spline shaft moves in the direction of extension or contraction in the sliding direction with respect to the spline sleeve, and one of the first elastic rubber and the second elastic rubber moves in the direction of extension. The other is elastically deformed in the contraction direction, and one of the first elastic rubber and the second elastic rubber acts on the spline shaft in the extension direction, and the other acts on the spline shaft in the contraction direction. Since the first elastic rubber and the second elastic rubber are lighter than the case where a metal coil spring is used, and there is no change in weight balance due to bending deformation, the weight of the expansion joint can be reduced. Therefore, it is possible to increase the critical rotation speed of the rotating shaft, and even when the spline shaft moves in any of the extending direction and the contracting direction. By making the elastic force according to the movement amount acting on the spline shaft equal, the thrust force acting on the spline shaft can be made equal in both the extending direction and the contracting direction without being affected by the characteristics of the elastic rubber alone. .

[Brief description of the drawings]

FIG. 1 is a side sectional view showing an embodiment of an expansion joint according to the present invention.

FIG. 2 is a cross-sectional view illustrating a main part of the expansion joint according to the present embodiment.

FIG. 3 is a perspective view of a rubber mount member in the expansion joint according to the embodiment.

FIG. 4 is an axial front view of a partition plate and a rubber mount member in the expansion joint of the present embodiment.

FIG. 5 is a side sectional view showing an example of a conventional expansion joint.

[Explanation of symbols]

1 ... first cross joint, 2 ... coupling, 4
... Second cross joint, 5,10 ... Flange, 6
... Spline sleeve, 6a ... Spline hole, 11 ...
Partition plate, 12: connecting bolt, 13: clamping plate, 20
... first rubber mount member, 21 ... second rubber mount member, 22 ... elastic rubber, 33 ... spline shaft.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takashi Oyama 3-10-10 Tsukiji, Chuo-ku, Tokyo Stock Company Nakamura Jikoku Co., Ltd. (72) Inventor Muroyama 3-10-10 Tsukiji, Chuo-ku, Tokyo Stock (56) References JP-A-4-15317 (JP, A) JP-A-4-81389 (JP, A) JP-A-4-153599 (JP, A)

Claims (2)

(57) [Claims] 1. A spline connected to a first rotating shaft.
And a spline sleeve coupled to the spline sleeve.
A spline shaft movably fitted therein, and a spline shaft within the spline sleeve.
A partition plate fixed at a position facing the distal end surface, and a spline shaft connected to the partition plate with the partition plate
Move with the spline shaft inside the ply sleeve
To the end face of the partition plate and the spline shaft.
Each is fixed, the end face of the partition plate and the spline shaft
A first elastic rubber elastically deformable between the first and second elastic plates, and the partition plate and the holding plate, respectively;
Second elastic rubber elastically deformable between the partition plate and the holding plate
And the number and shape of the first elastic rubber and the second elastic rubber.
An expansion joint having the same shape and elastic modulus . 2. The first cross joint via a first cross joint
A spline sleeve connected to the rotating shaft, and a spline sleeve connected to the second rotating shaft via a second cross joint.
The spline sleeve is slidably inserted into the spline sleeve.
A line shaft and the spline shaft within the spline sleeve.
A partition plate fixed at a position facing the distal end surface, and a spline shaft connected with the partition plate
Move with the spline shaft inside the ply sleeve
To the end face of the partition plate and the spline shaft.
Each is fixed, the end face of the partition plate and the spline shaft
A first elastic rubber elastically deformable between the first and second elastic plates, and the partition plate and the holding plate, respectively;
Second elastic rubber elastically deformable between the partition plate and the holding plate
And the number and shape of the first elastic rubber and the second elastic rubber.
Telescopic shaft joint Jo and elastic modulus, characterized in that equal to each other.