JP2001330054A - Method of manufacturing flexible coupling - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flexible coupling having excellent durability and capable of satisfying both the buffering property and the vibration absorbing property and the torque transmitting force in the case where a torsion displacement is small. SOLUTION: An even number of connector link 30 are arranged in the circumferential direction with the predetermined space, and the adjacent connector links 30 and 30 in the circumferential direction are connected to each other in the circumferential direction by a first and a second connecting belts 40 and 50 wrapped in a loop, and set in a primary molding 3, and the first and the second connecting belts 40 and 50 are coated with an elastic inner layer part so as to form a primary mold 1A. In the primary mold 1A, a pitch 1 of the connector links 30 and 30 is set smaller than a pitch of the connector links 30 and 30 in the primary molding, and the primary mold 1A is set in a secondary molding 5 in the condition that looseness is given to the first and the second connecting belts between each connector link 30 and 30 by projecting parts 64 and 65, and the periphery of the primary mold 1A is formed with an elastic outer layer at the predetermined thickness.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a flexible coupling for resiliently connecting the shaft ends of a driving side rotating shaft and a driven side rotating shaft.

In this type of flexible coupling, a plurality of drive-side connection rings and driven-side connection rings are arranged alternately in the circumferential direction, and the drive-side connection ring and the driven-side connection ring adjacent to each other in the circumferential direction are formed to some extent. There is a structure in which fibers are connected by a connecting band in which fibers are wound in a loop in a loose state, and the connecting ring and the connecting band are embedded in rubber. A typical prior art is disclosed in, for example,
-292924 or Patent Publication No. 277334
No. 8.

In the above-mentioned flexible coupling, each drive-side connecting ring is attached to the shaft end of the drive-side rotating shaft at equal intervals in the circumferential direction, while each driven-side connecting ring is attached to the shaft end of the driven-side rotating shaft by a circle. It is attached at equal intervals in the circumferential direction and transmits power from the drive side to the driven side.
Until the slack of the connecting band is eliminated between the driving-side connecting ring and the driven-side connecting ring, the torsional rigidity is maintained small so that an excellent vibration absorbing effect is exhibited, and when the connecting band is stretched linearly, It has two-stage characteristics, such as high torsional rigidity and high torque transmission.

[0004]

However, if the connecting band is slackened between the adjacent driving-side connecting ring and the driven-side connecting ring in order to make the torsional characteristics two-stage characteristics, when the rubber is molded, the metal band becomes loose. The filling of the molding material into the mold tends to cause the fiber density of the connection band to vary, or to cause a difference in the amount of slack. For this reason, each connecting band cannot share the input torque uniformly, that is, the input torque becomes excessive in some connecting bands, and the durability may be reduced.

Further, according to the above-mentioned prior art, since an insertion member for giving a slack to the connecting band is required, not only the number of parts is increased, but also the insertion member is in contact with the connecting band. As a result, the friction of the connecting band is accelerated, which may lead to early damage. In addition, when the torsion angle increases due to the input of torque, it is pointed out that the insertion member is likely to be detached from the connection band, and that the rubber may be cracked around the insertion member.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and its main technical problems are to improve both the vibration absorption and cushioning at the initial input of torque and the torque transmission force. An object of the present invention is to provide a flexible coupling which is satisfactory and has excellent durability.

[0007]

In order to effectively solve the above-mentioned technical problems, a method of manufacturing a flexible coupling according to the present invention comprises the steps of: disposing an even number of connecting rings at predetermined intervals in a circumferential direction; The connecting rings adjacent in the direction are connected alternately in the circumferential direction by first and second connecting bands wound in a loop, and set in a primary molding die, and the first and second connecting bands are set. To form a primary molded body covered with an elastic body layer,
In a state where the first and second connection bands are slackened between the connection rings via the elastic body layer portion, the primary molded body is set in a secondary molding die, and the primary The outer layer of the elastic body having a required thickness is formed on the outer periphery of the formed body.

[0008]

1 to 3 show a preferred embodiment of a method for manufacturing a flexible coupling according to the present invention. In the following description, the “circumferential direction” refers to a circumferential direction around the axis of the flexible coupling.

A flexible coupling to be manufactured in this manufacturing method has a structure as shown in FIG. That is, this flexible coupling 1
Are three driving-side connectors 10 arranged at 120 ° intervals in the circumferential direction, and three driven-side connections arranged at 120 ° intervals in the circumferential direction with a phase different from the driving connector 10 by 60 °. Connector 20, a connecting ring 30 mounted on the outer periphery of each of the connectors 10, 20, and a drive-side connector 10 which is adjacent in the circumferential direction.
The first and second connecting bands 40 and 50 are wound around the connecting ring 30 on the outer periphery of the first connecting member 30 and the connecting ring 30 on the outer periphery of the driven side connector 20 alternately in the circumferential direction. And an elastic body 60 made of an elastomer that is vulcanized and formed so as to cover the connecting bands 40 and 50.

Driving connector 10 and driven connector 20
Is made of a cylindrical metal member, and is arranged such that its axis is parallel to the axis of the flexible coupling 1. As shown in FIG. 2, the connecting ring 30 is fixed to the metal sleeve 31 to which the driving-side connector 10 or the driven-side connector 20 is press-fitted, and to the outer peripheral surfaces of both ends in the axial direction. It consists of a pair of metal collars 32 and 33 having a substantially U-shaped cross section.

As shown in FIG. 2, the first and second connecting bands 40 and 50 are formed by winding wires 41 and 51 made of a polymer material having a required tensile elasticity, such as polyester, in a multilayer shape. Things. And the first connecting band 4
Reference numeral 0 denotes a portion between the collars 32 and 33 on the outer periphery of the sleeve 31 of the connecting ring 30 mounted on the drive-side connector 10 and a driven-side connector 20 circumferentially adjacent to the drive-side connector 10. The connecting ring 30 is looped around a portion between the collars 32 and 33 on the outer periphery of the sleeve 31 of the attached connecting ring 30. In addition, the second connecting band 50
The collars 32 and 33 of the connecting ring 30 mounted on the driven connector 20 and the collars 32 of the connecting ring 30 mounted on the driving connector 10 circumferentially adjacent to the driven connector 20. , 33 are wound around in a loop.

That is, the drive-side connectors 10 and the driven-side connectors 20 are alternately arranged at intervals of 60 ° from each other.
A first connecting band 40 wound around the middle of the connecting rings 30, 30, ... in the axial direction and a second connecting band 50 wound around both ends of the connecting rings 30, 30, ... in the axial direction. They are alternately connected in the circumferential direction.

The elastic body 60 is formed so as to wrap around the connecting rings 30, 30,... And around the first and second connecting bands 40, 50 extending therebetween. Specifically, six bases 61 surrounding the outer peripheral side of each connecting ring 30;
An outer circumference and an inner circumference communication portion 62, 63 extending linearly between the base portions 61, 61 adjacent in the circumferential direction and surrounding the first connection band 40 or the second connection band 50; A window 60a is provided between these.

The first and second connecting bands 40 and 50 are
Outer peripheral connecting portion 62 and inner peripheral connecting portion 63 of elastic body 60
, It extends in a slack shape so as to be unevenly distributed toward the window 60a side. That is, the distance L1 between the intermediate portion of the first connecting band 40 passing through the outer peripheral connecting portion 62 and the intermediate portion of the first connecting band 40 passing through the inner peripheral connecting portion 63 is the first distance of the sleeve 31 of the connecting ring 30. The intermediate portion of the second connecting band 50, which is smaller than the connecting band winding diameter d1 (see FIG. 2) and similarly passes through the outer peripheral connecting portion 62, and the intermediate portion of the second connecting band 50 passing through the inner peripheral connecting portion 63, Is smaller than the second connection band winding diameter d2 (see FIG. 2) of the collars 32, 33 in the connection ring 30.

In the flexible coupling 1 having the above structure, each drive-side connector 10 is attached to the yoke at the shaft end of the drive-side rotary shaft at intervals of 120 ° in the circumferential direction by bolts (not shown) inserted through the respective connectors. On the other hand, each driven-side connector 20 is spaced apart from the yoke at the shaft end of the driven-side rotary shaft facing the shaft end of the driven-side rotary shaft by a bolt (not shown) inserted in the circumferential direction at intervals of 120 ° in the circumferential direction. Installed with. Thus, the rotation of the drive side rotation shaft is transmitted to the driven side rotation shaft via the first connection band 40 or the second connection band 50, and the first and second connection bands 40, 50 are transmitted.
Due to the deformation characteristics of the elastic body 60 and the elastic body 60, rotation transmission in a state where the axes of the drive side rotation shaft and the driven side rotation shaft are different from each other is allowed, and vibration is absorbed between the two shafts.

More specifically, when the driving-side rotating shaft and the driven-side rotating shaft are relatively torsionally displaced by the input of the torque, at the portion where the driving-side connector 10 and the driven-side connector 20 are relatively separated from each other, The one connecting band 40 or the second connecting band 50 is stretched from the slack shape between the connecting rings 30. Then, in the process until the first connecting band 40 or the second connecting band 50 is linearly stretched, the outer peripheral connecting portion 62 of the elastic body 60 integrated with the first connecting band 40 or the inner connecting portion 63 is Because it will be elastically deformed in the inner diameter direction,
It exhibits an appropriate torsional spring property, and thereby has an effective cushioning function and vibration absorbing function.

Further, when the amount of torsional displacement between the drive-side rotary shaft and the driven-side rotary shaft becomes larger than a predetermined value, the drive-side connector 10 and the driven-side connector 20 are relatively separated from each other. When the looseness of the one connecting band 40 or the second connecting band 50 is eliminated and it is in a state of being completely stretched linearly, the torsional spring constant is obtained from this point by the tensile elasticity of the first connecting band 40 or the second connecting band 50. Increase. For this reason, excessive torsional displacement between the drive-side connector 10 and the driven-side connector 20 is suppressed, and reliable torque transmission is performed.

FIG. 6 shows a characteristic diagram obtained by measuring the torsion spring characteristics of the flexible coupling 1 shown in FIG. As is clear from this figure, until the first connection band 40 or the second connection band 50 is stretched linearly, the torsional spring constant becomes a low vibration absorption region α, and in the region where the torsional angle is larger than that, the torsional spring The torque transmission region β has a high constant. In contrast, connecting band 4
As shown in FIG. 7, the flexible coupling having no slack at 0,50 has a high torsional spring constant from the beginning of torsion and does not have a remarkable vibration absorption region α. The vibration absorption area α can be expressed by the following equation.

(Equation 1) Here, φ1; connecting ring 3 in flexible coupling 1
.. (See FIG. 5) φ2; connecting rings 30, 30,
… Pitch (see Fig. 1)

Further, since the flexible coupling 1 does not have an insertion member for giving a slack to the first and second connecting bands 40 and 50, the number of parts does not increase.
First and second connecting bands 40, 50 due to friction with the member
Of the elastic body 60 due to the insertion member when the torsion angle increases, and the like.

The flexible coupling 1 having the above structure
Can be manufactured by the method described below.

First, as shown in FIG.
Fixed shafts 2, 2, arranged at a phase interval of 60 ° on the circumference of
Are respectively extrapolated and fixed, and the first connecting band 40 and the second connecting band 50 are alternately wound around the connecting rings 30, 30,. The pitch φ2 of the fixed shafts 2, 2,... Corresponds to the connecting rings 30, 30,... (The driving side connector 10 and the driven side connector 2) in the flexible coupling 1 as a product shown in FIG.
0) is set slightly larger than the pitch φ1. Further, as shown in FIG.
0 is wound around the portion between the collars 32 and 33 in the connecting ring 30, and the second connecting band 50 is
Wound around 2,33.

Next, in the above state, the connecting rings 30, 30,
... and the bundle of the first and second connecting bands 40 and 50 are incorporated into the molding space of the primary molding die 3, and then filled with an elastomer molding material and vulcanized. At this time, the first connecting band 40 and the second connecting band 50 are connected to the adjacent connecting rings 30 and 3.
Since the wire is wound with a predetermined tension applied during the interval of 0, the fibers of the connecting bands 40 and 50 do not fluctuate or slack due to the filling of the molding space with the elastomer molding material.

The molding space of the primary molding die 3 extends between a circular base molding space 101 surrounding each connecting ring 30 and the base molding spaces 101 adjacent to each other in the circumferential direction to form a first coupling space. It comprises an outer peripheral connecting portion forming space 102 and an inner peripheral connecting portion forming space 103 surrounding the band 40 or the second connecting band 50. Further, a concave portion 102a which is recessed toward the outer peripheral side is formed at an intermediate position in the extension direction in the outer peripheral connecting portion forming space 102, and a concave portion 102a is formed at the intermediate position in the extending direction in the inner peripheral connecting portion forming space 103. Recessed recess 103a
Are formed.

FIG. 3 shows a primary molded body 1A molded by the primary molding die 3 described above. The primary molded body 1A includes the connecting rings 30 and the first and second connecting bands 4.
0, 50 is covered with an elastic inner layer portion 60A having a shape corresponding to the molding space of the primary molding die 3, and the elastic inner layer portion 60A surrounds the outer peripheral side of each connecting ring 30. 62A extending between the six bases 61A and the bases 61A, 61A adjacent in the circumferential direction and surrounding the first connection band 40 or the second connection band 50. , 63A, and each outer peripheral connecting portion 62A has
Corresponding to the concave portion 102a in the primary molding die 3, a convex portion 64 protruding to the outer peripheral side is provided at each inner peripheral connecting portion 63A.
Are formed with convex portions 65 protruding toward the inner peripheral side corresponding to the concave portions 103a in the primary molding die 3, respectively.

Next, as shown in FIG. 4, the same pitch as the connecting rings 30, 30,... (The drive side connector 10 and the driven side connector 20) in the flexible coupling 1 as the product shown in FIG. The connecting rings 30, 30,... of the above-mentioned primary molded body 1A are extrapolated and fixed to the fixed shafts 4, 4,... arranged at a phase interval of 60 ° on the circumference of φ1. The primary molded body 1A is incorporated into the molding space of the secondary molding die 5.

The molding space of the secondary molding die 5 is formed of a circular base molding space 201 surrounding each base 61A of the elastic body layer portion 60A of the primary molded body 1A, and the base molding space 201 adjacent in the circumferential direction. The outer and inner connecting portions 62 of the primary molded body 1A extend linearly between
A, 63A are surrounded by an outer peripheral connecting portion forming space 202 and an inner peripheral connecting portion forming space 203. The gap G between the inner surface of the base molding space 201 and the base 61A in the molding space is smaller than the radial height of the convex portions 64, 65 formed in the outer and inner peripheral connecting portions 62A, 63a. Has become.

As described above, the pitch φ of the fixed shafts 4, 4,...
Reference numeral 1 denotes connecting rings 30, 3 at the time of molding by the primary molding die 3.
The fixed shafts 4, 4,.
The distance between the connecting rings 30, 30,.
The outer peripheral connecting portion 62A and the inner peripheral connecting portion 63A extending therebetween.
Can be given a predetermined slack. On the other hand, the height of the convex portions 64 and 65 formed in the elastic body layer portion 60A of the primary molded body 1A is different from the inner surface of the base molding space 201 in the molding space of the secondary molding die 5 and the primary molded body. 1A
Is larger than the gap G with the base 61A, the convex portions 64 abut on the inner surface of the outer peripheral connecting portion forming space 202, and the intermediate portion of the outer peripheral connecting portion 62A is moved toward the inner peripheral side of the outer peripheral connecting portion forming space 202. It is pushed so as to be unevenly distributed, and each of the convex portions 65 abuts on the inner surface of the inner peripheral communication portion forming space 203, and the intermediate portion of the inner peripheral communication portion 63 </ b> A is unevenly distributed toward the outer periphery of the inner peripheral communication portion forming space 203. Press to make it work.

For this reason, an intermediate portion between the first connecting band 40 or the second connecting band 50 passing through the outer peripheral connecting portion forming space 202 of the forming space and the first connecting band 40 or the second connecting band passing through the inner circumferential connecting portion forming space 203. The outer peripheral connecting portion 62A of the elastic inner layer portion 60A so that the second connecting bands 50 approach each other in the radial direction.
And it loosens together with the inner peripheral connecting portion 63A.

Next, the molding space of the secondary molding die 5 in which the primary molded body 1A is set as described above is filled with an elastomer molding material, so that the outer periphery of the primary molded body 1A has a required thickness. The elastic outer layer (not shown) is integrally vulcanized. At this time, since the first connecting band 40 and the second connecting band 50 composed of the multilayer wires 41 and 51 are covered with the elastomer (the outer circumferential connecting portion 62A and the inner circumferential connecting portion 63A), the filling of the elastomer molding material is performed. As a result, the fiber density of the connection bands 40 and 50 does not vary, and the slack amount of the connection bands 40 and 50 is defined by the convex portions 64 and 65 in the primary molded body 1A.
There is no variation in the amount of slack.

After molding by the secondary molding die 5, the connecting rings 30, 30,...
0 are alternately fitted to form a flexible coupling 1 having the structure shown in FIG.

The present invention is not construed as being limited to the illustrated embodiment. For example, connecting ring 3
The arrangement intervals of 0, 30,... Do not necessarily have to be arranged at equal intervals in the circumferential direction as shown in the figure, but are determined according to the specifications of the shaft end yoke to be mounted.

[0032]

According to the method of manufacturing a flexible coupling according to the present invention, after forming the primary molded body covering the connection band, the connection band is provided with slack between the connection rings. Since the flexible body having the two-stage characteristic is manufactured by secondary molding of the elastic body, the elastic body is provided despite the loosening of the connecting band between the circumferentially adjacent connecting rings. During molding, the molding material is not filled into the mold, so that the fiber density and the amount of slack in the connecting band do not vary. It is possible to provide a flexible coupling having excellent properties. In addition, since a member for giving a looseness to the connection band is not required, the number of components is not increased, and a decrease in durability due to the member can be prevented.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a molding step of a primary molded body in a preferred embodiment of a method of manufacturing a flexible coupling according to the present invention.

FIG. 2 is a partial cross-sectional view showing a connection ring around which first and second connection bands are wound, together with a connector on an inner periphery thereof, taken along a plane passing through an axis in the manufacturing method.

FIG. 3 is an external view showing a partial cross section showing a primary molded body obtained by the manufacturing method of the embodiment.

FIG. 4 is an explanatory view showing a forming step of a secondary formed body in the manufacturing method.

FIG. 5 is an external view showing a partial cross section showing a flexible coupling manufactured by the above manufacturing method.

FIG. 6 is a characteristic diagram showing a torsion spring characteristic of the flexible coupling.

FIG. 7 is a characteristic diagram showing torsional spring characteristics of a flexible coupling as a comparative example having a structure in which a connecting band has no slack.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flexible coupling 1A Primary molded object 2, 4 Fixed shaft 3 Primary molding die 5 Secondary molding die 10 Drive side connector 20 Follower side connector 30 Connecting ring 31 Sleeve 32, 33 Collar 40 First connecting band 41, 51 Wire rod 50 Second connecting band 60 Elastic body 60A Elastic inner layer part 60a Window 61, 61A Base 62, 62A Outer connecting part 63, 63A Inner connecting part 64, 65 Convex part 101, 201 Base forming space 102, 202 outer peripheral connecting part forming space 102a, 103a recess 103, 203 inner peripheral connecting part forming space

Claims (1)

[Claims] An even number of connecting rings (30) are arranged at predetermined intervals in the circumferential direction, and the connecting rings (30, 30) adjacent in the circumferential direction are arranged.
30) are connected alternately in the circumferential direction by first and second connection bands (40, 50) wound around in a loop, and are set in a primary molding die (3). Two connecting belts (4
(0, 50) is coated with an elastic body layer (60A) to form a primary molded body (1A), and the first and second connection bands (40, 50) are formed via the elastic body layer (60A). With the slack given between the connecting rings (30, 30), the primary molded body (1A) is set in a secondary molding die (5), and the primary molded body (1A) A method for manufacturing a flexible coupling, comprising forming an elastic outer layer portion having a required thickness on an outer periphery.