JPH0733852B2 - Coupling - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a coupling used for a flexible joint of an automobile or the like, and more specifically, to a drive shaft and a driven shaft while allowing a slight inclination of the shaft center. The present invention relates to a coupling for transmitting rotational torque between the two, and for absorbing vibration and shock between the drive shaft and the driven shaft.

[Prior Art] As a conventional coupling, four or more even-numbered mounting brackets arranged in a circumferential direction so as to draw a circle and the outer peripheral surfaces of two adjacent mounting brackets do not intersect each other. It is known that the first and second loop cords are wound in a loop shape in multiple layers and a rubber elastic coating portion for embedding and fixing the first and second loop cords is used. .

This conventional coupling is used in flexible joints. For example, a coupling in which mounting brackets are alternately connected by bolts or the like between a main shaft of a transmission in an automobile and a propeller shaft connected to a differential is a coupling between the axis of the main shaft and the axis of the propeller shaft. Rotational torque is transmitted in the torsional direction while permitting a slight inclination of the shaft core, and vibrations and shocks are absorbed between the shafts.

[Problems to be Solved by the Invention] In the conventional coupling, the durability in the twisting direction is improved by adjusting the material and the number of windings of the cord, and the material and the coating amount of the elastic coating portion. That is, the durability of the coupling in the twisting direction can be improved by increasing the number of windings of the cord or the coating amount of the elastic coating portion, or by making the material of the cord or the elastic coating portion hard.

However, it is not preferable to perform these operations because the cost of the coupling becomes high.

The present invention has been made in view of the above-mentioned conventional problems, and provides a coupling excellent in durability in the twisting direction while keeping the same material and number of windings of cord and material and coating amount of an elastic coating portion. The purpose is to

[Means for Solving the Problems] The coupling of the present invention is an even number of four or more core parts arranged in a circumferential direction so as to draw a circle, and an outer peripheral surface of the core parts arranged in the axial direction. A mounting bracket having at least three partition walls divided into a first rack cord portion and a second rack cord portion, and each of the two neighboring brackets arranged along the circumferential direction. A first loop cord that is wound in a loop in multiple layers between the first rack cord parts, and each of the second rack cord parts of every two adjacent fittings that are not connected by the first loop cord. In a state in which the second loop cord wound in a loop in multiple layers between the first loop cord and the second loop cord are tensioned by urging the fittings in the centrifugal direction. A rubber elastic covering portion for embedding and fixing all the first loop cords and the second loop cords; , The first loop cord and the second loop cord each comprising:
Between the two cords adjacent to each other, the cords that are wound and positioned on the outer side are located inside the cords that are wound on the opposite sides of each of the first rack cord portion and the second rack cord portion that are wound. The cross-sections of the cords cut in the axial direction so as to be located are in a close-packed state, and the contact points of two adjacent cords of the layer inside the cross-section and the two layers of the layer immediately outside the cords are in contact with the cords. It is characterized in that the line connecting the contact points of the cord has an angle of 60 degrees or more with respect to the line parallel to each layer.

The coupling of the present invention comprises a mounting member, first and second loop cords, and an elastic covering portion.

The mounting bracket has a core and a partition. There are four or more mounting brackets, which are even numbers, and these are arranged in a circumferential direction so as to draw a circle. Each core part is provided with at least three partition walls, and the partition walls partition the outer peripheral surface into a first rack cord portion and a second rack cord portion in the axial direction.

The first loop cord is wound in a loop in multiple layers between the respective first rack cord portions of every two adjacent fittings arranged along the circumferential direction. As the cord forming the first loop cord, the polyester fiber similar to the conventional one can be used.

The second loop cord is wound in a loop in multiple layers between the second rack cord portions of every two adjacent fittings that are not connected by the first loop cord. For the cord forming the second loop cord, the polyester fiber similar to the conventional one can be used.

The most characteristic part of the present invention is a part of each of the first and second rack cords, around which the first and second loop cords are wound, facing each other (hereinafter, referred to as a back-facing portion).

That is, in the first and second loop cords, the cross-sections of the cords cut in the axial direction are in the close-packed state in the back-facing portions thereof. Here, the "closest packed state" refers to a state in which the cord that is wound and positioned on the outer side is inside and that is positioned between two cords that are adjacent to each other.

Further, the first and second loop cords have contact points between two adjacent cords of a layer inside the cross section (hereinafter referred to as an inner layer) and a layer immediately outside the cords in contact with the cords at the back portion. The line connecting the contact points of the two cords (hereinafter referred to as the outer layer) has an angle of 60 degrees or more with respect to the line parallel to each layer. In the winding of the cords, it is more preferable that all the cords are accurately placed in the closest packing state, but practically, 50% or more of the cords may be placed in the closest packing state. Further, the angle between the line connecting the two contact points and the line parallel to each layer may be 60 degrees or more in average.

The elastic covering portion urges each mounting bracket in the centrifugal direction to move each first
And all the first loops with tension applied to the second loop cord.
And the second loop cord is embedded and fixed. This elastic covering portion can be formed of rubber as in the conventional case.

The coupling of the present invention can be manufactured by the following method. First, an even number of metal fittings, which are four or more equipped with at least three partition walls, are arranged in the circumferential direction.
Then, the cords are wound in a loop state between the first or second rack cord portions of the adjacent fittings by a predetermined number of windings to form the first and second loop cords. Next, the partition walls are caulked toward each other to reduce the width of the first and second rack cords. That is, the first and second loop cords are brought closer to each other. Next, each fitting is biased in the centrifugal direction to apply tension to the cord. This keeps the cords in the closest packing state, and the line connecting the contact points of two adjacent cords in the inner layer and the contact points of two cords in the outer layer is 60 degrees with respect to the line parallel to each layer. Make the angle above. This state is set in a mold, and vulcanization molding is performed to mold the elastic coating portion. In this way, the first and second loop cords are fixed.

In the above manufacturing method, the mounting metal may be vulcanized while being biased in the centrifugal direction so that tension is applied to the first and second loop cords. You may urge to. The urging in the centrifugal direction after the vulcanization molding can be performed by connecting the mounting member and the bolt at the stage of mounting the coupling of the present invention as a flexible joint.

Further, in the above manufacturing method, the step of caulking the partition wall and the step of biasing the attachment fitting in the centrifugal direction to apply tension to the cord can be reversed.

Further, in the above manufacturing method, when the partition wall portion is to be caulked after vulcanization molding, the partition wall portion can be caulked by connecting the mounting member and the bolt or the like at the stage of mounting the coupling.

In this way, the coupling of the present invention can be obtained.

[Operation] Since the cords of the first and second loop cords are compressed in the radial direction and the width direction in the back portion, the cord density (the number of cords per unit area) is higher. It is in. For this reason, the first and second loop cords in the back portion can be subjected to tension and torsional strain acting on the cord more integrally.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the coupling of this embodiment has a point O
Six mounting brackets 1 arranged in a circumferential direction so as to draw a circle centering around, the first and second loop cords 2 and 3 wound around the outer peripheral surface of each mounting bracket 1, and each first And an elastic covering portion 4 for embedding and fixing the second loop cords 2 and 3.

As shown in FIG. 3, each mounting bracket 1 has one core 11
And a cylindrical sleeve fitted in the center of the outer periphery of the core 11.
It is composed of 120 and three partition walls 12. The core portion 11 and the sleeve 120 are made of metal and formed into a tubular shape. Partition wall 12
Are each made of metal, and have first and second washers 121 and 122 spread like flanges that are fitted to both ends of the sleeve 120 with the same thickness as the sleeve 120, and the first and second washers 121 and 122 that are fitted to the outer peripheral center of the sleeve 120. The second washer 121, 122 is formed of a central washer 123 that extends in a flange shape at the same height. Each core portion 11 has the first and second washers 121, 122.
In addition, a central washer 123 divides the outer peripheral surface thereof into a first rack cord portion 11a and a second rack cord portion 11b in the axial direction.

As shown in FIG. 1, FIG. 2 and FIG. 3, the first loop cord 2 is provided between the first rack cord portions 11a of every two adjacent fittings 1 arranged along the circumferential direction. It is looped in layers. The second loop code 3 is
As shown in FIG. 1 and FIG. 3, each second of the two fittings 1 that are not connected by the first loop cord 2 and are adjacent to each other.
A number of loops are wound between the rack cord portions 11b. The cord 5 forming the first and second loop cords 2 and 3 is made of polyester fiber. First and second
The loop cords 2 and 3 have the back portion H shown in FIG.
The cross section of the cord 5 cut in the axial direction is the closest packed state.
That is, as schematically shown in FIG. 4, the cord 51 which is wound and positioned on the outer side is positioned between two cords 52 which are on the inner side and are adjacent to each other. Further, the first and second loop cords 2 and 3 are
The contact point between two adjacent cords 52 on the inner layer and the two on the outer layer
The line connecting the contact points of the individual cords 51 has an angle of α degrees with respect to the line parallel to each layer. In this example, α = 60.

As shown in FIG. 2 and FIG. 3, the elastic cover portion 4 urges each mounting member 1 in the centrifugal direction to apply tension to each of the first and second loop cords 2 and 3, and all The first and second loop cords 2 and 3 are embedded and fixed. The elastic covering portion 4 is made of rubber. It should be noted that, as shown in FIG.
41 is formed, and four injection protrusions 42 are partially formed.

The coupling of this example is manufactured by the following method. First, as shown in FIG. 1, the sleeve 12
0, first and second washers 121, 122 and central washer 1
Six mounting brackets 1 equipped with 23 were arranged in the circumferential direction around the point O. Then, as shown in FIG. 5, the cord 5 is looped between the first or second rack cord portions 11a and 11b of the adjacent mounting brackets 1 in a predetermined number of loops to form the first and second loop cords. A few formed. As schematically shown in FIG. 6, the cord 5 at this stage has, like the conventional coupling, a cross section in the axial direction that is an elliptical shape that is long in the axial direction, and is wound separately from each other. It is in a state.
Further, the contact point between the cord 52 of the inner layer and the cord 51 of the outer layer was α = about 40 with respect to the line parallel to each layer. At this time, the first and second loop cords 2 and 3 have a width W in the width direction.
= 13.5 mm and radial thickness T = 6.0 mm. Next, in the back portion H, as shown by an arrow P in FIG.
The washer 121 and the second washer 122 are caulked in the direction of approaching each other to reduce the width W of the first and second rack cord portions 11a and 11b. That is, the first and second loop cords 2 and 3 were brought closer to each other. Next, each fitting 1 was biased in the centrifugal direction to apply tension to the cord 5. As a result, the cord 5 was in the closest packing state, and as shown in FIG. 4, the cord 5 was set to α = 60. At this time, the first and second
The loop cords 2 and 3 have a width W = 12.7 mm and a thickness T = 6.5 mm
Met. This state was set in a mold (not shown) and vulcanized and molded to form the elastic coating portion 4. Thus
The coupling of this example was obtained.

This coupling is used in flexible joints in automobiles, as shown in FIG. This equipment can be done as follows. That is, the bolts 81 are alternately passed from the three flanges of the sleeve yoke 61 provided on the main shaft 6 of the transmission to the core portion 11 of the mounting member 1 and tightened with nuts 82 from the back, and the sleeve provided on the propeller shaft 7 is provided. York 71
Alternately from the three flanges of the
Through the table, tighten the nut 82 etc. At this time, as in the conventional case, the centering device 9 is interposed between the sleeve yoke 61 of the main shaft 6 and the sleeve yoke 71 of the propeller shaft 7, and the convex spherical surface and the concave spherical surface are slidably engaged to each other to form a joint angle. Secure.

Next, the operation of the coupling of this embodiment will be described. When an engine (not shown) is driven in a state where the coupling of the present embodiment is assembled to the main shaft 6 and the propeller shaft 7, the main shaft 6 rotates in the twisting direction (arrow Q in FIG. 7). Then, the mounting bracket 1 also tries to rotate in the torsional direction, and is pressed by the mounting bracket 1 to be elastically covered.
At the same time, the first and second loop cords 2 and 3 try to rotate in the twisting direction, and a torsional strain is applied to them. Further, tension due to a slight inclination of the shaft center is applied to the cord 5.
In the coupling of this embodiment, since the cords 5 are compressed in the radial direction and the width direction at the back portion H, the density of the cords 5 is higher. Therefore, the first and second loop cords 2 and 3 in the back portion H integrally receive the tension and the torsional strain acting on the cord 5. Therefore, the durability in the twisting direction is improved while the material and the number of windings of the cord 5 and the material and the coating amount of the elastic coating portion are kept the same. In this way, the coupling rotates, and similarly the rotation is transmitted to the propeller shaft 7 via the coupling, and the propeller shaft 7 rotates in the twisting direction (arrow R in FIG. 7) while allowing a slight inclination of the shaft center. To do. When the rotation is transmitted to the propeller shaft 7,
The rear wheels of the vehicle are driven via a differential (not shown). At this time, vibrations and the like on the side of the main shaft 6 are damped by the vibration and shock absorbing action of the elastic coating portion 4.

The durability of the coupling of this example and the conventional coupling which was not caulked in the width direction was evaluated by repeatedly applying a torque load in a high temperature atmosphere. As a result, the conventional coupling fatigue-cuts at 2.5 × 10 ⁴ times, whereas the coupling of this example does not fatigue-cut up to 5 × 10 ⁴ times. From these results, it can be seen that the coupling of this example has twice the durability as the conventional coupling.

In the coupling of this embodiment, α = 60 as shown in FIG. 4, but the present invention is not limited to this. For example, as shown in FIG.
By performing the crimping more strongly, α> 60 can be obtained in which the cross section of the cord 5 is elliptical in the thickness direction. Thus, in the coupling of the present invention, 60 ≦ α
Up to <90, the action and effect of the present invention can be obtained.

[Effect of the Invention] As described above, in the coupling of the present invention, since the first and second loop cords are compressed in the radial direction and the width direction in the back portion, the cord material, the number of windings, and the elasticity. It is possible to improve the durability in the twisting direction while maintaining the same material and amount of the coating portion. Therefore, the durability of the coupling can be improved without increasing the cost.

[Brief description of drawings]

1 to 7 relate to an embodiment of the present invention. FIG. 1 is a front view of a coupling, FIGS. 2 and 3 are sectional views taken along the line AA of FIG. 1, and FIG. 4 is a cord. FIG. 5 is a side sectional view of the coupling before the elastic covering is formed, FIG. 6 is an explanatory view schematically showing the state of the cord before caulking, and FIG. 7 is a cup. It is an exploded perspective view showing equipment of a ring. FIG. 8 is an explanatory view schematically showing the state of the cord in another embodiment. 1 ... Mounting bracket, 11 ... Core part 11a ... First frame cord part 11b ... Second frame cord part 12 ... Partition wall part, 121 ... First washer 122 ... Second washer, 123 ... Center Washer 2 …… First loop cord, 3 …… Second loop cord 4 …… Elastic sheath 5,51,52 …… Cord

Claims (1)

[Claims] 1. An even number of four or more core portions arranged in a circumferential direction so as to draw a circle, and a first frame cord portion and an outer peripheral surface of the core portion arranged axially in rows. A mounting bracket having at least three partition walls divided into rack cords, and a plurality of loops between each of the first rack cords of two adjacent mounting brackets arranged along the circumferential direction. In a loop shape between the first loop cords wound in a circular shape and the second rack cord portions of every two adjacent fittings that are not connected by the first loop cords. A second loop cord, and all the first loop cords and the second loop cords in a state in which each of the first loop cords and each of the second loop cords is tensioned by urging each of the fittings in the centrifugal direction. A coupling comprising a rubber elastic covering portion for embedding and fixing a loop cord, wherein 1 loop code and the second loop code,
Between the two cords adjacent to each other, the cords that are wound and positioned on the outer side are located inside the cords that are wound on the opposite sides of each of the first rack cord portion and the second rack cord portion that are wound. The cross-sections of the cords cut in the axial direction so as to be positioned are in a close-packed state, and the contact points of two adjacent cords of the layer inside the cross-section and two layers of the layers immediately outside the cords are in contact with the cords. Coupling characterized in that the line connecting the contact points of the cord has an angle of 60 degrees or more with respect to the line parallel to each layer.