JP2567405Y2 - Shaft coupling shaft fastening structure - Google Patents

Description

[Detailed description of the invention]

[0001]

[Industrial applications] This invention is applied to machine tools, robots,
Applied to precision equipment for high-precision control such as OA equipment are required to function in the axial fastening structure of beneficial shaft coupling, in particular, a pair of C
Shaft joint consisting of a shaft and a connector support
The present invention relates to a shaft fastening structure in which the accuracy of a connecting member support portion is improved.

[0002]

2. Description of the Related Art Conventionally, this type of shaft fastening structure includes, for example,
For example, Japanese Patent Application Laid-Open No. Hei 5-71550 (hereinafter simply referred to as Conventional Example 1)
Or Japanese Utility Model Application Laid-Open No. 61-47121.
As shown in FIG.
In addition, the radial slide from the outer circumference to the inner circumference of the coupling
The slit is provided and the slit
Tighten the coupling in the circumferential direction on the insertion side of the spindle
After inserting the rotating shaft into the coupling,
The rotating shaft can be connected via a coupling by tightening
Structures are commonly used. Also, even if
For example, Japanese Unexamined Patent Application Publication No. 3-134076 (hereinafter simply referred to as Conventional Example 3)
As shown in the figure).
And the clamp groove is cut off symmetrically in the diameter direction.
And symmetrically (there are actually two split structures)
At right position, tighten the cable from right angle to
There is also a structure to wear.

[0003]

Put to the above prior art The present invention is to provide a
Conventional Examples 1 and 2 reach the inner circumference from the outer circumference of the coupling.
Radial slits are separated from the inner and outer ends.
Also have a structure in which the coupling is tightened on one side only.
As a result, the tightening force is biased,
Twist in the axial direction, resulting twisting, varying <br/> type between to be connected axially, twist, accurate rotation transmission occurs such twisted can
And wear and tear caused by deformation due to shaft fastening are remarkable.
Shaft metal wear is also severe , metal fatigue increases ,
This is true for precision instruments that cannot tolerate errors of several microns.
It was impossible to use a simple shaft fastening structure. In addition,
In the third case, clamping is performed on both sides, but the clamp groove is cut off.
Especially when tightening, twisting and axial direction
The displacement and deformation are remarkable.
In precision instruments where errors of several microns are not allowed
It was impossible to use such a shaft fastening structure.

[0004] The shaft fastening structure of the shaft coupling of invention resolves such a problem, in the shaft coupling comprising a pair of hubs with the coupling member support portion for fixing the shaft, even the shaft that accurate on the hub
As well as between the hub and the connector support.
High-precision shaft connection eliminates deformation, twisting, etc.
An object of the present invention is to provide a shaft coupling structure for a shaft coupling that can be performed .

[0005]

Means for Solving the Problems] on opposite surfaces of the shaft fastening structure of the shaft coupling of invention is' a pair of hubs 2,2 inserting fixing the 'axis 1,1 to be connected, the hub 2, 2' Ream of approximately the same diameter as
In the shaft coupling with integrally sintered body supporting portions 3 and 3 ', the upper
The pair of hubs 2, 2 'are inserted into the shaft insertion holes 4, 4' from the inner periphery thereof.
Diametral slits 5 near the outer circumference of the
5 'provided symmetrically, the slitting 5,5' the predetermined predetermined thickness of the elastic thin portion 6, 6 'to the outer-side end portion is formed linearly in the axial direction of, and left and right Slot 5 in the slot,
The fastening means 8, 8 'for fastening 5' from a right angle direction is provided.
Characterized in that it is provided with clamping mechanisms 7, 7 ' .

[0006]

According to the structure of the present invention, the hubs 2 and 2 ' are axially inserted.
The shafts 1 and 1 'are inserted into the insertion holes 4 and 4' , and the clamp mechanism 7,
Slitting 5 of the hub 2, 2 'with' concluded means 8, 8 '7,
When tightening 5 ', the linear elastic thin portions at both outer ends
6, 6 'bulges slightly outward when the slit approaches,
Due to the bending stress, the slits 5 and 5
Uniform stress distribution without twisting, twisting, etc.
And shake the end faces of the shaft insertion holes 4, 4 'at all.
Shaft insertion hole with reduced diameter while maintaining unprecedented accuracy
4 and 4 'to the shafts 1 and 1'
To maintain the accuracy of shaft fastening and
Axial displacement, deformation, etc. of the connected body support parts 3, 3 '
Changes in the axial direction due to the rigidity of the linear elastic thin portions 6, 6 '
So that there is no
Hold the degree. As a result, high accuracy with no error
Can be fastened to the shaft due to deformation caused by the shaft fastening.
Accurate rotation transmission is possible without causing wear and twist .

If the shaft is fastened as described above, for example,
The rotation of the shaft 1 is smoothly and reliably transmitted from the hub 2 → the connecting member support portion 3 → the connecting member 10 → the connecting member supporting portion 3 ′ → the hub 2 ′ → the shaft 1 ′.

[0008]

EXAMPLE shown in FIG. 1 to FIG. 6, using the click <br/> loss joint pin 10 to the connecting member, the connecting member support portion a shaft coupling in which a bearing arm 3, 3 ', 1, 1 'connect
The rotation axis to be arranged, and are arranged on the same axis. 2, 2 '
Is a pair of metal hubs for inserting and fixing the rotating shafts 1 and 1 ' .
The hubs 2, 2 'have shaft insertion holes 4, 4' at their centers.
The bearing arms 3, 3, 3 ',
With 'the hub 2, 2' 3 and formed in the same diameter integral with, and,
From the inner circumference of the shaft insertion holes 4, 4 'to the outer circumference of the hubs 2, 2'
The slits 5 and 5 'in the diametric direction are provided symmetrically to each other , and a predetermined predetermined slit is provided at the outer end of the slits 5 and 5'.
The thick elastic thin portions 6, 6 'are formed linearly in the axial direction ,
And a tightening bolt for tightening the slits 5, 5 'from a right angle.
The clamping mechanism 7, 7 ' provided with the
There Ru.

Formed on the outer side end portion of the [0009] upper SL slitting 5,5 '
The thickness of the elastic thin portions 6, 6 'linear in the axial direction is , for example,
If, good to the thickness capable rigidity other than torsional rigidity maximally low, and slitting 5,5 'inner end of the outer end portion of the elastic thin portion 6, 6 at the time of tightening in an arc shape' To disperse the stress applied thereto. Incidentally, slightly larger in diameter than the dimension of the gap 'split 5,5 sliding the inner end of the' slitting 5,5
Circular portion and Then elastic thin portion 6, 6 'in such a stress partial <br/> dispersion of can more effectively performed.

[0010] The above Symbol slitting 5 of the clamping mechanism 7, 7 ',
5 'the shaft insertion hole 4, 4' 'provided, slitting 5,5' tightening <br/> bolts 8, 8 symmetrically positioned on the inner circumferential side of the right angle way the
So that tightening from the other side. In the embodiment, the slit 5,
5 'provided at right angles to, the fastening holes 9, 9''on both sides the inner peripheral side of the symmetrical clamping from opposite directions to the location holes 9, 9' of sliding split 5,5 slitting the outer peripheral Steps 5 and 5 ' are defined as stepped insertion holes a, slots 5 and 5' are defined as screw holes b, and fastening bolts 8 and 8 'are inserted through the insertion holes a and screwed into the screw holes b. It has been tightened way.

Reference numeral 10 denotes a cross joint pin as a connecting body, which is provided with a cross-direction support pin 12 on a central cylindrical body 11 and has bearing arms 3, 3 ' as connecting body supporting portions.
Support holes 13, 13 'for inserting and supporting the support pins 12.
And bearings 14 and 14 ′ such as oilless bearings are provided in the support holes 13 and 13 ′, and the cross joint pin 10 is connected to the bearings 14 and 1 of the bearing arms 3, 3, 3 ′ and 3 ′.
4 'is slidably and freely rotatably supported on the 4' to absorb the eccentricity and declination generated between the rotating shafts 1 and 1 ' so as to transmit between the shafts.
I have .

Namely, the rotary shaft 1, 1 'eccentric movement of the cross joint pin 10 bearing 14, 14' is absorbed by sliding in a radial direction through the deflection angle movement cross the joint pin 10 is bearing 14 , 14 ′ , the eccentricity of the rotating shafts 1, 1 ′,
Declination bearings 14, 14 of the cross joint pin 'is absorbed by the sliding and rotational movement via the hub 2, 2'
Smooth rotation is transmitted while following the movement of.

[0013] In the configuration that was noted above, as shown in FIG. 4, shown is in Figure 6
As shown in the figure , the rotary shafts 1 and 1 'to be connected to the shaft insertion holes 4 and 4' of the hubs 2 and 2 ' are inserted into the insertion holes a and screw holes b on both sides of the hubs 2 and 2'. be reciprocal tightening bolt 8, 8 '
Screwed and inserted from the direction that, 'slitting 5,5 by Rukoto is evenly tightened closely on both sides of' slitting 5,5
Straight elastic thin portions 6, 6 ' extending in the axial direction at the outer end of the
It is slightly bulging deformation to the outside, sliding split 5 in its bending stress,
Uniform stress without kinking or twisting of 5 '
End faces of shaft insertion holes 4, 4 '
The shaft under the condition that the diameter is reduced while maintaining the precision with no runout
Each rub 'the rotary shaft 1, 1' insertion holes 4, 4 on the outer diameter surface of the
Part is equally close contact with The rewritable hold the accuracy of the shaft engagement,
Axial displacement of bearing arms 3, 3 'due to the shaft fastening
The deformation and the like are constant rigidity of the linear elastic meat portions 6, 6 '.
Hub 2
Bearing arms 3 and 3 'connected to 2' are substantially the same as hubs 2 and 2 '.
Along with the same diameter, even stress is applied in the axial direction
Without kinking and twisting, and
The accuracy of the arms 3 and 3 'can be reliably maintained.
Consists of a loss joint pin 10 and bearing arms 3, 3 '
Abrasion and kink caused by deformation due to shaft fastening
Nothing happens.

Therefore, the bearing arms 3, 3 ' and the hub 2,
Since the torsional rigidity 2 ' is maintained as it is, the cross joint pin 10 and the bearing arms 3, 3' are not twisted against a load change, and the rotation of one of the rotary shafts 1 is changed from the hub 2 to the bearing arm 3 to the bearing 14. Cross joint pin 10 → bearing 1
4 '→ bearing arm 3' → circle <br/> slip into the hub 2 '→ the rotary shaft 1', can be reliably transmitted.

In the embodiment, the shaft coupling structure in which the cross joint pin 10 is supported by the integral bearing arms 3 and 3 ' having the same diameter as the hubs 2 and 2' is shown, but the invention is not limited to this. No, the above structure is a universal joint,
It can also be used for shaft fastening structures such as Oldham couplings, hook shaft couplings, and leaf spring type shaft couplings. In the embodiment, a pair
Slits 5 and 5 'of the hubs 2 and 2' are provided in an intersecting manner.
However, they may be provided in the same direction. And hubs 2 and 2 '
The bearing arms 3, 3 'have an integral structure of the same diameter or less than the same diameter.
You.

[0016]

[Effect of the invention] According to the axial fastening structure of the shaft coupling of this invention, the shaft insertion hole of the pair of hubs to be inserted securing the shaft to be connected
Diametral slits from the inner circumference to near the outer circumference of the hub
Are provided symmetrically on the outer end of the slit.
The elastic thin part with the predetermined thickness was formed linearly in the axial direction.
When the shaft is fastened, the linear elastic thin part slightly swells and deforms outward.
The bending stress causes kinking, twisting, etc.
Approach and flex under uniform stress distribution
To reduce the diameter of the shaft insertion hole while maintaining accuracy without any runout.
The shaft insertion hole into the shaft outer diameter surface
The shaft insertion hole without any errors
Performed with high precision.

[0017] Further , a connecting member support portion accompanying the shaft fastening is provided.
Displacement or deformation in the axial direction is caused by the linear elastic thin part
The rigidity keeps it from changing in the axial direction.
And the stress applied to the supporting body
Maintaining accuracy, supporting torsion, eliminating runout,
Combined with the high precision of the shaft fastening, rotation transmission between shafts is
Perform smoothly and reliably.

Therefore, deformation due to shaft fastening is caused.
No wear or kinks, tolerance of several microns
Can be used effectively as a shaft coupling in precision equipment
Can, moreover, wear, since there is no deformation or the like, a long period of time with high accuracy
Can be maintained, and for opening and closing the clamp mechanism when the shaft is fastened.
The straight line at the outer end of the slit at the both sides symmetric position
Bolts, etc., due to the bending stress, rigidity, etc. of the elastic thin part
Tighten the right and left fastening means equally up to a certain tightening limit
The above high-precision shaft fastening can be performed any number of times under the same conditions.
Can be performed.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing an embodiment of the shaft coupling of the present invention .

FIG. 2 is a side view of the same.

FIG. 3 is a front view of the same.

FIG. 4 is a longitudinal sectional view of the same.

FIG. 5 is a sectional view taken along line XX of FIG. 3;

6 is a sectional view taken along line YY in FIG. 3;

[Explanation of symbols]

Reference Signs List 1 shaft 1 'shaft 2 hub 2' hub 3 bearing arm 3 'bearing arm 4 shaft insertion hole 4' shaft insertion hole 5 slot 5 'slot 6 linear elastic thin section 6' linear elastic thin section 7 clamp mechanism 7 'Clamp mechanism 8 Tightening bolt 8' Tightening bolt 9 Tightening hole 9 'Tightening hole 10 Cross joint pin

Claims (1)

(57) [Scope of request for utility model registration] A pair of hubs (2) and (2 ') for inserting and fixing shafts (1) and (1') to be connected are provided on opposite surfaces of the hubs.
(2), a connecting member supporting portion (3) having substantially the same diameter as (2 ′),
In a shaft coupling integrally provided with (3 ') , a pair of hubs (2) and (2') have shaft insertion holes (4),
From the inner circumference of (4 ') to the outer circumference of hubs (2) and (2')
Diameter direction of slitting leading up to (5), (5 ') provided in symmetrical, the slitting (5), (5' previously determined at the outer end of)
The elastic thin portions (6) and (6 ') with the predetermined thickness
To the right and left and right slits.
(5) fastening means for fastening (5 ') from a right angle direction
(8), a clamp mechanism (7) provided with (8 '),
(7 ') A shaft coupling structure for a shaft coupling, comprising: