JP2003214456A - Flexible coupling - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable to manufacture a flexible coupling 4 using loop-shaped connecting bolts 20 and 30 at low cost. <P>SOLUTION: A driving side bobbin 10A and a driven side bobbin 10B adjacent in the circumferential direction are connected by the first and second connecting belts 20 and 30 wound in a loop shape. The bobbins 10A and 10B and the connecting belts 20 and 30 are embedded in an annular elastic body 40. The driving side bobbin 10A and the driven side bobbin 10B are composed of a cylindrical connector 11, a synthetic resin first connecting belt collar 12 fixed to a shaft directional intermediate part of an outer peripheral surface, and having a collar part 12b on the shaft directional both ends, and a pair of steel plate second connecting belt collars 13 fixed by being positioned on the shaft directional both sides of the first connecting belt collar 12 on an outer peripheral surface of the cylindrical connector 11, and having a collar part 13b in an end part on the opposite side of the first connecting belt collar 12. <P>COPYRIGHT: (C)2003,JPO

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elastic coupling between shaft ends of a driving-side rotating shaft and a driven-side rotating shaft to transmit rotational torque and to rotate both shafts. A flexible coupling that absorbs axial vibration and bending between the bobbin, which is attached to the drive-side rotary shaft side and the driven-side rotary shaft side, in particular, are connected via a loop-shaped connection band. And a structure having a structure. FIG. 4 is a cross-sectional view showing a typical prior art of this type of flexible coupling 100 cut along a plane perpendicular to its axis, and FIG. 5 is a sectional view taken along line VV 'in FIG.
It is an expanded sectional view cut and shown by a line. That is, in the flexible coupling 100 shown in FIGS. 4 and 5, a plurality of and the same number of cylindrical drive-side connectors 101 and driven-side connectors 102 are alternately arranged in the circumferential direction, and the drive sides adjacent to each other in the circumferential direction are arranged. The connector 101 and the driven-side connector 102 are connected by first and second connection bands 105 and 106 wound around in a loop over the drive-side bobbin 103 and the driven-side bobbin 104 respectively mounted on the outer periphery thereof. Bobbin 1
03 and 104 and connecting bands 105 and 106 are embedded and integrated in an annular elastic body 107 made of rubber or the like. The first and second connecting bands 105 and 106 are formed by winding cords of polyester or the like having appropriate tensile elasticity in multiple layers. [0005] As shown in FIG. 5, a driving-side bobbin 103 and a driven-side bobbin 103 are respectively connected to a driving-side connector 101.
Alternatively, a steel sleeve 108 is press-fitted into the outer periphery of the driven-side connector 102, and a pair of steel collars 109 are press-fitted and fixed to the outer peripheral surface thereof at predetermined axial intervals. The collars 109, 109 are press-formed in a substantially U-shaped cross section having annular flanges on both axial sides. [0004] The first connecting band 105 includes a driving bobbin 103.
Collars 109 and 10 on the outer peripheral surface of the sleeve 108 of FIG.
9 and the sleeve 108 of the driven bobbin 104
Is wound around the portion between the collars 109, 109 on the outer peripheral surface of the second connecting band 106 adjacent to the collar 109 in the circumferential direction.
Are wound around the collars 109, 109 of the driving bobbin 103 and the collars 109, 109 of the driven bobbin 104, respectively. In other words, each drive-side connector 101 and each driven-side connector 102 that are alternately arranged at equal intervals in the circumferential direction are formed by one bundle of the first connection band 105 and two bundles of the second connection bands 106, 106. They are alternately connected in the circumferential direction. [0005] This flexible coupling 100
The drive-side connector 101 on the inner periphery of the drive-side connector 103 is attached to the yoke at the shaft end of the drive-side rotary shaft via bolts and nuts (not shown) arranged at regular intervals in the circumferential direction, while the driven side is connected. The driven bobbin 102 on the inner periphery of the bobbin 104 is attached to the yoke at the shaft end of the driven rotating shaft via bolts and nuts (not shown) arranged at regular intervals in the circumferential direction. Thereby, while transmitting the rotation torque of the drive side rotation shaft to the driven side rotation shaft, the first and second connection bands 1
05, 106 and the deformation characteristics of the annular elastic body 107,
Rotational transmission in the connection state (twisted state) where the directions of the axes of the drive side rotation axis and the driven side rotation axis are different, the relative displacement of both rotation axes in the axial direction, and the transmission vibration between both rotation axes It absorbs. According to the conventional flexible coupling 100, the drive bobbin 103 and the driven bobbin 104 are formed by drawing a steel pipe and chamfering the inner peripheral portions of both end surfaces by cutting. It is manufactured by press-fitting a pair of collars 109 formed by pressing a steel plate into the outer peripheral surface of the sleeve 108. The chamfer of the sleeve 108 is formed so that the sleeve 108 can be easily pressed into the outer periphery of the driving-side connector 101 or the driven-side connector 102. However, the bobbins 103 and 104 manufactured as described above require a steel pipe drawing process and a chamfering process by cutting the inner peripheral portions of both end surfaces of the bobbin 103 when manufacturing the sleeve 108. 10
9 also has a problem in that the process of press-forming a flat steel plate into a shape having flanges 109a at both ends in the axial direction is complicated, and the production cost is increased. A collar 109 press-formed from a flat steel plate into a shape having flanges 109a at both ends in the axial direction.
, The thickness of one flange portion 109a tends to vary. Therefore, it becomes difficult to densely wind the cord in the second connecting band 106, which causes variations in torsional spring characteristics and durability. In addition, the collar 109 has the flanges 109a at both ends in the axial direction, so that the length in the axial direction is increased, which also causes the thickness of one of the flanges 109a to vary widely. Further, the sleeve 108 is press-fitted into the cylindrical drive-side connector 101 or driven-side connector 102.
Since the area of the press contact surface was large and the sleeve 108 was made of steel, the resistance at the time of press fitting was large. SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and a technical problem thereof is to make it possible to manufacture a flexible coupling using a loop-shaped connecting band at low cost. [0010] As a means for effectively solving the above-mentioned technical problems, the flexible coupling according to the first aspect of the present invention comprises a plurality of drives arranged alternately in the circumferential direction. Side bobbin and driven side bobbin, the first and second connecting bands arranged in a circumferentially alternately wound around the driven side bobbin in a loop over the driven side bobbin circumferentially adjacent to the driving side bobbin, The bobbin and the first, the second connecting band is embedded and molded in a circumferentially continuous annular elastic body, and each bobbin is provided with a tubular connector and an axially intermediate portion of an outer peripheral surface thereof. The first connection band collar made of a synthetic resin fixed and having flanges at both ends in the axial direction, and fixed to the outer peripheral surface of the tubular connector on both axial sides of the first connection band collar. Has a collar at the end opposite to the collar for the first connection band It consists of a pair of collars for the second connecting band. FIG. 1 shows a state in which a drive side rotating shaft 1 and a driven side rotating shaft 2 in a propeller shaft or the like of an automobile are connected via a flexible coupling 4 according to the present invention. FIG. 2 is a cross-sectional view cut along a plane passing through FIG.
Is a cross-sectional view of the flexible coupling 4 of the present invention cut along a plane orthogonal to the axis thereof, and FIG. 3 is an enlarged cross-sectional view cut along the line III-III ′ in FIG. In the following description, the “circumferential direction” refers to a circumferential direction around the axis of the flexible coupling. First, in FIG. 1, reference numeral 1 denotes a drive side rotating shaft, 2 denotes a driven side rotating shaft, and 3 denotes a centering bush for holding the centering of the driven side rotating shaft 1 and the driven side rotating shaft 2 to each other. . The opposing shaft ends of the drive side rotation shaft 1 and the driven side rotation shaft 2 are connected via a flexible coupling 4 according to the present invention. As shown in FIG. 2, the flexible coupling 4 includes three cylindrical drive bobbins 10A arranged at intervals of 120 ° in the circumferential direction, and the drive bobbin 10A.
A, 10A, each intermediate position, that is, the drive side bobbin 10
A is provided with three cylindrical driven bobbins 10B arranged at a phase different from that of A by 60 ° and at intervals of 120 ° in the circumferential direction. These drive side bobbin 10A and driven side bobbin 10B
Indicates that each of the shaft centers is the flexible coupling 4
Are arranged so as to be parallel to the axis. As shown in FIG. 1, the driving bobbin 10
A is attached to the yoke 1a at the shaft end of the drive-side rotary shaft 1 at intervals of 120 ° in the circumferential direction by bolts 5A inserted therein and nuts 6A screwed thereto, and the driven-side bobbins 10B are respectively Is attached to the yoke 2a at the shaft end of the driven-side rotary shaft 2 at intervals of 120 ° in the circumferential direction by a bolt 5B inserted into the shaft 5 and a nut 6B screwed to the bolt 5B. The driving bobbin 10A and the driven bobbin 10B circumferentially adjacent to each other are connected to the first and second connecting bands 20 and 30.
Are connected alternately. The bobbins 10A and 10B and the connecting bands 20 and 30 are integrally embedded in an annular elastic body 40 formed of an elastomer material such as rubber. That is, the annular elastic body 40 is set in a mold in a state where the bobbins 10A and 10B are connected via the connection bands 20 and 30, and the mold is filled with a molding elastomer material and vulcanized. Thus, the bobbin 10A, 10B and the connecting band 20, 30 are integrally formed. That is, the flexible coupling 4
Transmits the rotational torque of the drive-side rotary shaft 1 to the driven-side rotary shaft 2 via the first and second connecting bands 20 and 30,
Depending on the deformation characteristics of the first and second connecting bands 20 and 30 and the annular elastic body 40, rotation transmission in a twisting state in which the directions of the axes of the drive side rotation shaft 1 and the driven side rotation shaft 2 are different, , 2 are allowed and the transmitted vibration between the two rotating shafts 1, 2 is absorbed. The driving bobbin 10A and the driven bobbin 10B
Are the same, and as shown most clearly in FIG. 3, a cylindrical connector 11 made by cutting out a steel pipe or the like of carbon steel and a second connector fixed to an axially intermediate portion of the outer peripheral surface thereof. A collar 12 for one connecting band and a pair of collars 13 for a second connecting band fixed to the outer peripheral surface of the tubular connector 11 on both sides in the axial direction of the collar 12 for the first connecting band. The first connecting band collar 12 has a cylindrical portion 12a.
And a second connecting band collar 1 on both sides in the axial direction.
Reference numerals 3 and 13 each have a substantially L-shaped cross section including a cylindrical portion 13a and a flange portion 13b extending from one end thereof. The collars 13b of the second connecting band 13 have a flange 13b facing the side opposite to the collar 12 for the first connecting band, and the end of the cylindrical portion 12a facing the side of the collar 12 for the first connecting band. , Is in contact with or close to the end of the first connecting band collar 12.
The distance between the flanges 12a of the first connecting band collar 12 is longer than the distance between the flange 12a of the first connecting band collar 12 and the flange 13b of the second connecting band collar 13. It has become. The first connecting band 20 and the second connecting band 30 are formed by winding a cord made of a polymer material having a required tensile elasticity such as polyester, for example, in a multilayer shape, and are alternately arranged in the circumferential direction. Are located. More specifically, the first connecting band 20 is disposed in a bundle at three positions in the circumferential direction at a phase interval of 120 °, and includes a cylindrical portion 12a of the first connecting band collar 12 on the driven side bobbin 10B; The first connecting band collar 1 on the driving bobbin 10A circumferentially adjacent to the driven bobbin 10B.
It is wound around in a loop over the second cylindrical portion 12a. The second connecting band 30 is 60 ° with the first connecting band 20.
Each two bundles are arranged at three places in the circumferential direction on different phases,
Each of the cylindrical portions 13a of the pair of second connecting band collars 13 in the drive side bobbin 10A and the drive side bobbin 1
It is looped around the cylindrical portion 13a of the pair of second connecting band collars 13 in the driven side bobbin 10B circumferentially adjacent to 0A. That is, each drive side bobbin 10A and each driven side bobbin 10B are
Are arranged alternately in the circumferential direction at a phase interval of °, and the first connecting band 20 of one bundle and the second connecting bands 30, 30 of two bundles
They are alternately connected in the circumferential direction. The ring-shaped elastic body 40 is made of a rubber-like elastic material such as NR and the like.
First and second connecting bands 2 extending around and between the first and second OBs
It is molded so as to wrap around 0,30. The cylindrical connector 11 of each of the bobbins 10A and 10B has both ends in the axial direction projecting from the inner periphery of the second connecting band collar 13 to the outside, and an annular elastic body 40 is provided on the outer peripheral surface of the projecting portion 11a. Are integrally baked and adhered. Thus, the load of the first connecting band collar 12 and the second connecting band collar 13 coming off is compensated. Each of the driving bobbins 10 is attached to the annular elastic body 40.
A hole 41 is formed at an intermediate position between A and each driven-side bobbin 10B, and is opened on one side in the axial direction. This hole 41
Is to prevent a crack caused by compression in the annular elastic body 40 therebetween due to a relative displacement between the driving bobbin 10A and the driven bobbin 10B due to a torsional input to the flexible coupling 4. According to the flexible coupling 4 of the present embodiment configured as described above, the first connecting band collar 12
Since is made of a synthetic resin material, it can be manufactured at low cost using a resin molding die. The second connecting band collar 13 is made of a steel plate such as SPCC and has a flange 12a at only one end in the axial direction. Therefore, the conventional flexible cup shown in FIG. Unlike the collar 109 of the ring 100, which has flanges 109a on both sides in the axial direction,
It can be easily manufactured at low cost by a punching press or the like. In addition, the first connecting band collar 12 and the second connecting band collar 13 are press-fitted to the outer periphery of the cylindrical connector 11 so that the conventional sleeve 10 can be used.
Since the production and press-fitting step of 8 are not required, this also greatly contributes to the reduction of the production cost. Since the first connecting band collar 12 is made of a synthetic resin material, it can be easily pressed into the outer peripheral surface of the cylindrical connector 11 with a small press-in resistance. The second connecting band collars 13 on both sides in the axial direction have a flange portion 13b only on one side in the axial direction. Therefore, the axial width can be shortened by that much, and the press-fitting resistance to the cylindrical connector 11 can be reduced. Is also smaller. Then, as described above, the cylindrical connector 1
Since the one protruding portion 11a and the annular elastic body 40 are integrally baked and adhered, the pull-out load of the first connecting band collar 12 and the second connecting band collar 13 is compensated. The first connecting band collar 12 is made of synthetic resin, whereas the second connecting band collar 13 is made of steel, so that the required strength against the axial load is maintained. In addition, since the thickness of the collar portion 13b does not vary in the forming process of the second connecting band collar 13, the cord of the second connecting band 30 can be precisely wound, and the variation in torsional spring characteristics and durability is reduced. can do. According to the flexible coupling according to the first aspect of the present invention, the driving bobbin and the driven bobbin are
A cylindrical connector, a synthetic resin first connecting band collar fixed to an axially intermediate portion of the outer peripheral surface and having flanges at both axial ends, and a first connecting band collar on the outer peripheral surface of the cylindrical connector. The first connecting band collar comprises a pair of second connecting band collars which are fixedly positioned on both axial sides of the connecting band collar and have a flange at the end opposite to the first connecting band collar. The collar for the band can be manufactured at low cost by resin molding, and the collar for the second connecting band can be manufactured at a low cost by a punching press and the like, and the press-in resistance is reduced, so that the manufacturing is facilitated. , Can be provided at low cost. In addition, since there is no variation in the thickness of the collar portion of the collar for the second connection band, the second connection band can be wrapped densely to reduce variations in torsional spring characteristics and durability. The driving bobbin and the driven bobbin are
Since it is manufactured integrally with the cylindrical connector, there is no need to manufacture the bobbin as a separate part from the connector by assembling the sleeve and the collar as in the past, and the sleeve is not required, which also reduces the manufacturing cost. Will be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view showing a state in which a drive side rotating shaft 1 and a driven side rotating shaft 2 in a propeller shaft or the like of an automobile are connected via a flexible coupling 4 according to the present invention, FIG. FIG. 2 is a cross-sectional view showing a preferred embodiment of the flexible coupling 4 according to the present invention, cut along a plane perpendicular to the axis thereof. FIG. 3 is an enlarged sectional view taken along line III-III ′ in FIG. 2; FIG. 4 shows a flexible coupling 1 according to the prior art.
FIG. 2 is a cross-sectional view showing a section taken along a plane perpendicular to the axis of the axis. FIG. 5 is an enlarged sectional view cut along a line VV ′ in FIG. 4; [Description of Signs] 1 drive side rotating shaft 2 driven side rotating shaft 3 centering bush 4 flexible coupling 5A, 5B bolt 6A, 6B nut 10A drive side bobbin 10B driven side bobbin 11 cylindrical connector 11a projecting portion 12 first connection Band collars 12a, 13a Cylindrical portions 12b, 13b Collar portion 13 Second connecting band collar 20 First connecting band 30 Second connecting band 40 Annular elastic body 41 Hole

Claims (1)

Claims 1. A plurality of driving bobbins (10A) and driven bobbins (10B) which are alternately arranged in a circumferential direction, and are circumferentially adjacent to the driving bobbins (10A). First and second connecting bands (20, 3) which are wound in a loop over the driven bobbin (10B) and are arranged alternately in the circumferential direction.
0), and the bobbin (10A, 10B) and the annular elastic body (40) which is formed by burying the first and second connecting bands (20, 30) and which is continuous in the circumferential direction. (10A, 10B) are fixed to the cylindrical connector (11) and an axially intermediate portion of the outer peripheral surface thereof, and flange portions (1) are provided at both axial ends.
2b) The first connecting band collar (1) made of synthetic resin having
2) and an outer peripheral surface of the tubular connector (11), which is fixed on both sides in the axial direction of the first connecting band collar (12) and is fixed on the opposite side to the first connecting band collar (12). A pair of second connecting band collars (13) each having a flange (13b) at an end.
A flexible coupling comprising: