JPH0735827U - Elastic shaft coupling - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a lightweight, small-sized elastic shaft coupling with a long life. [Structure] The cylindrical member 30 is made of carbon fiber reinforced plastic, glass fiber reinforced plastic, or a composite material of carbon fiber reinforced plastic and glass fiber reinforced plastic, and has elasticity in a twisting direction. Spline shaft 23 fixed to the first cross joint 21
Is fitted and inserted into the spline tube 27, and the spline tube 27 is connected to the first fixing portion 26 of the second cross joint 24 by the cylindrical member 30.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an elastic shaft coupling that connects a drive shaft and a driven shaft to transmit a rotational force and has a degree of freedom in a twisting direction and a bending direction.

[0002]

[Prior art]

 The elastic shaft coupling that connects the drive shaft and the driven shaft is configured to be elastically deformable in the torsional direction between the shafts. This allows the vibration damping property to block the vibration between the shafts and the variation of the torsional moment. There is a shock absorber that absorbs a shock and is swingable at two points so that the drive shaft and the driven shaft can be tilted depending on the application.

FIG. 7 is a side sectional view showing an example of a conventional elastic shaft coupling, and FIG. 8 is a perspective view of the elastic member shown in FIG.

Reference numeral 1 is a cross joint, 2 is a first flange, and 3 is a spline tube having a spline hole 3a. The first flange 2 is fixed to one swing end of the cross joint 1, and one end surface of the spline tube 3 is fixed to the other swing end.

Reference numeral 4 is a first elastic member fixing flange, and 5 is a spline shaft vertically provided on one end surface of the first elastic member fixing flange 4. The spline shaft 5 is fitted into the spline hole 3a of the spline tube 3 and fixed to the spline tube 3 in the rotating direction. Reference numeral 6 is a seal ring that prevents dust and the like from entering between the spline shaft 5 and the spline hole 3a.

Reference numeral 7 is a second flange, 8 is a second elastic member fixing flange, and 9 is an intermediate shaft for fixing the second flange 7 and the second elastic member fixing flange 8.

Reference numeral 10 is an elastic member formed of rubber, 11 is a sliding projection protruding from the end face of the first elastic member fixing flange 4, and 12 is protruding from the end face of the second elastic member fixing flange 8. The sliding convex portion 11 is a sliding concave portion 11 that is slidably fitted into a sliding concave portion 12 in which a part of the outer surface is formed into a convex spherical surface and a part of the inner surface is formed into a concave spherical surface. There is.

The elastic member 10 is a ring-shaped member as shown in FIG. 8, and has six bolt holes 10a and 10b formed at equal intervals in the circumferential direction. The second elastic member fixing flange 8 is provided with three bolt holes 8a at positions facing the bolt holes 10a of the elastic member 10, respectively. The elastic member 10 is inserted into the bolt hole 10a and fixed to the second elastic member fixing flange 8 by a bolt 13 inserted into the bolt hole 8a and a nut 14 screwed to the bolt 13. Further, the first elastic member fixing flange 4 is provided with three bolt holes 4a at positions facing the bolt hole 10b of the elastic member 10, and is fixed to the second elastic member fixing flange 8. Further, the elastic member 10 is further inserted into the bolt hole 10b, and is fixed to the first elastic member fixing flange 4 by a bolt 13 inserted into the bolt hole 4a and a nut 14 screwed to the bolt 13.

The elastic shaft joint shown in FIG. 7 connects the first rotating shaft 51 and the second rotating shaft 52, and one of the rotating shafts 51 and 52 applies a rotational force to the shaft joint. The drive shaft is transmitted, and the other is a driven shaft to which the rotational force is transmitted from the shaft coupling. A flange 53 is fixed to the end surface of the first rotating shaft 51, and the flange 53 is fixed to the first flange 2 by a bolt 15 and a nut 16. A flange 54 is fixed to the end surface of the second rotary shaft 52, and the flange 54 is fixed to the second flange 7 by the bolt 15 and the nut 16.

The cross joint 1 is configured to be swingable in two directions orthogonal to the axis, and can transmit a rotational force in a state where the first rotary shaft 51 is inclined with respect to the spline shaft 5. . Further, the elastic members 10 fixed to the first elastic member fixing flange 4 and the second elastic member fixing flange 8 respectively have elasticity, and the sliding projection 11 is slidably fitted in the sliding recess 12. Due to the fitting, the elastic member 10 elastically deforms corresponding to the inclination of the second rotating shaft 52 with respect to the spline shaft 5. The elastic member 10 elastically deforms in response to the inclination of the second rotating shaft 52, so that the elastic member fixing flanges 4 and 8 can rotate even when the second rotating shaft 52 is inclined with respect to the spline shaft 5. Rolling force can be transmitted. Furthermore, the elastic member 10 can suppress the transmission of vibrations between the elastic member fixing flanges 4 and 8, and the elastic member 10 elastically deforms in the torsional direction in response to the fluctuation of the torsional moment, so that the fluctuation of the torsional moment is caused. It is possible to reduce the shock generated by.

[0011]

[Problems to be solved by the device]

 However, in the above elastic shaft coupling, since the elastic member 10 is made of rubber, there arises a problem that the service life of the elastic member 10 is shortened depending on usage conditions. For example, when the bending angle of the elastic member 10 is large, or when the rotating shafts 51 and 52 are frequently started and stopped, the life of the elastic member 10 becomes particularly short. Further, in such an elastic shaft coupling, the elastic member 10 is formed in a ring shape so that the outer diameter becomes large, and the problem that the power loss during rotation becomes large because the elastic member 10 is heavy. There is also.

An object of the present invention is to provide a lightweight, small-sized elastic shaft coupling having a long life.

[0013]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the first means of the present invention comprises a first cross joint having a first flange fixed to one swing end and a second flange fixed to one swing end. And a second fiber-reinforced plastic or carbon fiber-reinforced plastic or a composite material of glass fiber-reinforced plastic and carbon fiber-reinforced plastic, and one end of the first cross-joint is A cylindrical member fixed to the second cross joint in the rotational direction is provided near the other end, respectively.

A second means is a first cross joint having a first flange fixed to one swing end, a second flange, and a glass fiber reinforced plastic or carbon fiber reinforced plastic or glass. A cylindrical member which is formed of a composite material of fiber reinforced plastic and carbon fiber reinforced plastic, and has one end portion near the cross joint and the other end portion near the second flange in a rotational direction. Is characterized by.

The third means is formed by a first flange, a second flange and a composite material of glass fiber reinforced plastic or carbon fiber reinforced plastic or glass fiber reinforced plastic and carbon fiber reinforced plastic, A cylindrical member fixed to the first flange near one end and to the second flange near the other end, respectively.

[0016] Further, the fourth means is a spline shaft protruding from the other swing end of the first cross joint, and the spline shaft is fitted and inserted, and the cylindrical member is externally fitted and fixed to the outer peripheral surface. And a spline tube in which a portion is formed.

Further, a fifth means is characterized in that the cylindrical member is bent in different directions alternately at a constant pitch in the length direction to form a bellows shape.

In a sixth means, a first flange is fixed to one swing end and a spline shaft is fixed to the other swing end, and a first cross joint is fixed to one swing end. The second flange is fixed, the second cross joint in which the first fixing portion projects from the other swing end, and the spline shaft are fitted and inserted, and the second fixing portion is formed on the outer peripheral surface. An outer side formed by a spline tube and a composite material of glass fiber reinforced plastic or carbon fiber reinforced plastic or glass fiber reinforced plastic and carbon fiber reinforced plastic, and the one end vicinity is externally fitted and fixed to the first fixing portion. Composite material of cylindrical member and glass fiber reinforced plastic or carbon fiber reinforced plastic or glass fiber reinforced plastic and carbon fiber reinforced plastic An inner cylindrical member that is formed of a material, has a spline shaft inserted therein, and one end portion of the outer cylindrical member is externally fitted and fixed to the second fixing portion. The feature is that the end portion and the other end portion of the outer cylindrical member are connected and fixed.

[0019]

[Action]

 According to the first means described above, the first cross joint having the first flange fixed to one swing end and the second cross joint having the second flange fixed to one swing end. It is formed by a joint and a glass fiber reinforced plastic or carbon fiber reinforced plastic or a composite material of glass fiber reinforced plastic and carbon fiber reinforced plastic. One end portion is near the first cross joint and the other end portion is near the above. The cylindrical member that is fixed in the rotation direction to the second cross joint reduces the weight and size of the cylindrical member that elastically deforms in the torsional direction in response to the transmitted torque, and the first cross joint and the second cross joint. The joints respectively permit tilting of the first flange and the second flange with respect to the cylindrical member.

According to the second means, the first cross joint in which the first flange is fixed to one swing end, the second flange, the glass fiber reinforced plastic or the carbon fiber reinforced plastic. Alternatively, a cylindrical member which is formed of a composite material of glass fiber reinforced plastic and carbon fiber reinforced plastic, is fixed to the cross joint at one end and to the second flange at the other end in the rotational direction. The cylindrical member that elastically deforms in the torsional direction according to the transmission torque is reduced in size and weight, and the first cross joint allows the inclination of the first flange with respect to the cylindrical member.

According to the third means, the first flange, the second flange, the glass fiber reinforced plastic or the carbon fiber reinforced plastic, or the composite material of the glass fiber reinforced plastic and the carbon fiber reinforced plastic. And a cylindrical member having one end portion fixed to the first flange and the other end portion fixed to the second flange, a cylindrical member elastically deformed in a torsional direction in response to a transmission torque. Lightweight and miniaturized.

Further, according to the fourth means, the spline shaft protruding from the other swing end of the first cross joint and the spline shaft are fitted and inserted, and the cylindrical member is externally fitted and fixed to the outer peripheral surface. The spline tube having the fixed portion allows the spline tube to slide with respect to the spline shaft to adjust the distance from the first flange to the second flange.

Further, according to the fifth means, the cylindrical member is bent in the length direction alternately at different pitches in different directions to form a bellows shape, so that the cylindrical member bends in accordance with the inclination of the flange. Elastically deforms in any direction.

According to the sixth means, the first flange is fixed to one of the swing ends and the spline shaft is fixed to the other swing end, and the first cross joint. The second flange is fixed to the end, the second cross joint in which the first fixing portion projects from the other swinging end, the spline shaft is fitted and inserted, and the second fixing portion is formed on the outer peripheral surface. Spline tube and a glass fiber reinforced plastic or carbon fiber reinforced plastic or a composite material of glass fiber reinforced plastic and carbon fiber reinforced plastic, and one end part is externally fitted and fixed to the first fixing part. The outer cylindrical member and the glass fiber reinforced plastic or carbon fiber reinforced plastic or glass fiber reinforced plastic and carbon fiber reinforced plastic An inner cylindrical member formed of a composite material, having a spline shaft inserted therein, and one end portion of the outer cylindrical member being externally fitted and fixed to the second fixing portion. By connecting and fixing the other end of the outer cylindrical member to the other end of the outer cylindrical member, the cylindrical member that elastically deforms in the torsional direction in response to the transmission torque can be made lighter and smaller, and the distance between the flanges can be increased. Without, it becomes possible to lower the spring constant in the torsion direction.

[0025]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a side sectional view showing a first embodiment of the elastic shaft coupling of the present invention.

Reference numeral 21 denotes a first cross joint, 22 denotes a first flange fixed to one swing end of the first cross joint 21, and 23 denotes another swing end of the first cross joint 21. Spline shaft, 24 is a second cross joint, 25 is a second flange fixed to one swing end of the second cross joint 24, and 26 is the other swing of the second cross joint 24. A cylindrical first fixed portion projecting from the end, 27 is a spline tube in which the spline shaft 23 is fitted and fixed to the spline shaft 23 in a rotational direction, and 28 is an end portion of the spline tube 27. The second fixing portion having the same outer diameter as the first fixing portion 26, 29 is a radial bearing arranged between the spline tube 27 and the spline shaft 23, and 30 is the first fixing portion near one end. To 26 It is a cylindrical member that is fitted over and fixed with an adhesive, rivets, etc., and the vicinity of the other end is fitted over the second fixing portion 28 and fixed with an adhesive, rivets, etc.

FIG. 6 is a perspective view of an example of the cylindrical member according to the present invention, taken along a direction orthogonal to the axis.

The cylindrical member 30 has three layers in the radial direction, the inner first layer 31 is made of GFRP (carbon fiber reinforced plastic) and the middle second layer 32 is made of CFRP (glass fiber reinforced plastic). The outer third layer 33 is formed of GFRP.

The first layer 31 and the third layer 33 are woven so that the carbon fibers are wound in the circumferential direction, and as a result, they have high strength in the twisting direction. The second layer 32 is woven so that the glass fibers extend in two directions that are inclined with respect to the axial direction, and the fibers in one direction intersect with the fibers in the other direction. It has high strength in the pulling direction. Further, epoxy resin is impregnated into GFRP or CFRP in the first layer 31, the second layer 32 and the third layer 33. The cylindrical member 30 thus configured has high strength and light weight, and the spring constant in the twisting direction can be easily set to a desired value by adjusting the length.

The elastic shaft coupling shown in FIG. 1 is small and lightweight because it is configured to transmit the rotational force by the cylindrical member 30, and the fiber direction is appropriately set according to the usage conditions. Sufficient strength can be imparted, resulting in a long life.

FIG. 2 is a side sectional view showing a second embodiment of the elastic shaft coupling of the present invention. Members corresponding to the members described with reference to FIG. 1 are designated by the same reference numerals and the description thereof will be omitted.

Reference numeral 34 denotes a first fixing portion formed in a cylindrical shape projecting from the end surface of the second flange 25, and reference numeral 40 denotes one end portion of the first fixing portion 34 which is externally fitted to the first fixing portion 34 so as to have an adhesive or rivet It is a cylindrical member that is fixed by the second fixing portion 28 and is fixed to the second fixing portion 28 by an adhesive agent or a rivet.

The cylindrical member 40 has the same three-layer structure as the cylindrical member 30 described with reference to FIG. 6, and is formed into a bellows shape by being alternately bent at different intervals in the axial direction during machining. Has been done. The cylindrical member 40 configured in this manner has high strength and is lightweight, and the spring constant in the twisting direction can be easily set to a desired value by adjusting the length, and further, even in the bending direction. Since a sufficient amount of elastic deformation is secured, the rotational force can be transmitted even when the second flange 25 is inclined with respect to the spline shaft 23.

Since the elastic shaft coupling shown in FIG. 2 is configured to transmit the rotational force by the cylindrical member 40, the second cross joint 24 can be omitted as compared with the first embodiment. It is small and lightweight.

FIG. 3 is a side cross-sectional view showing a third embodiment of the elastic shaft coupling of the present invention. Members corresponding to those described with reference to FIGS. 1 and 2 are designated by the same reference numerals and their description is omitted. To do.

Reference numeral 35 denotes a second fixing portion formed in a cylindrical shape so as to project from the end surface of the first flange 22. Since the cylindrical member 40 is elastically deformable in the bending direction, it can transmit the rotational force even when the second flange 25 is inclined with respect to the first flange 22 and can be expanded and contracted. The distance between the flanges 22 and 25 can be easily adjusted according to the positions of 51 and 52.

In the elastic shaft coupling shown in FIG. 3, the first cross joint 21 can be omitted as compared with the second embodiment, so that the structure is simplified and the weight and cost are reduced.

FIG. 4 is a side sectional view showing a fourth embodiment of the elastic shaft coupling of the present invention. Members corresponding to the members described with reference to FIGS. 1 to 3 are designated by the same reference numerals and the description thereof will be omitted. To do.

36 is a spline tube into which the spline shaft 23 is inserted, 37 is a second fixed portion having a diameter smaller than that of the first fixed portion 26, formed on the outer peripheral surface of the spline inch tube 36, and 50 is attached to the spline shaft 23. A ring-shaped connecting member that is rotatably fitted through a radial bearing 29, 51 and 52 are a third fixing portion and a fourth fixing portion formed on the outer peripheral surface of the connecting member 50, and 53 is one end portion. An outer cylindrical member, the vicinity of which is externally fitted and fixed to the first fixing portion 26, and the vicinity of the other end is externally fitted and fixed to the third fixing portion 51, and 54 is the outer cylindrical member described above. Inside 53 is an inner cylindrical member whose one end portion is externally fitted and fixed to the second fixing portion 37, and the other end portion is externally fitted and fixed to the fourth fixing portion 52.

The outer cylindrical member 53 and the inner cylindrical member 54 have a three-layer structure similar to that of the cylindrical member 30 described with reference to FIG. By elastically deforming in the twisting direction, it is possible to reduce the spring constant in the twisting direction without increasing the distance between the flanges 22 and 25.

The elastic shaft coupling shown in FIG. 4 is configured so that the rotational force is transmitted by the two cylindrical members 53 and 54, so that the distance between the flanges 22 and 25 is not increased and compared with the first embodiment. Then, the spring constant can be set in a wide range.

FIG. 5 is a side sectional view showing another example of the main part of the fourth embodiment.

The other ends of the outer cylindrical member 61 and the inner cylindrical member 62 are connected and fixed by a connecting portion 63. The connecting portion 63 is integrally molded together with the outer cylindrical member 61 and the inner cylindrical member 62, or is bonded to the outer cylindrical member 61 and the inner cylindrical member 62 so that the outer cylindrical member 61 and the inner cylindrical member 62 are joined together. Connect and fix the other end of each. As a result, the connecting member 50 shown in FIG. 4 can be eliminated, and the weight of the joint can be reduced.

Further, in the first to fourth embodiments, the cylindrical members 30, 40, 53, 54, 61 and 62 are made of the composite material of CFRP and GFRP. Of course, all three layers are made of CFRP. Alternatively, all three layers can be formed by GFRP.

[0046]

[Effect of device]

 According to the first means of the present invention described above, the cylindrical member elastically deformed in the torsional direction in response to the transmission torque is reduced in size and weight, and the first cross joint and the second cross joint are respectively cylindrical members. By allowing the inclination of the first flange and the second flange with respect to, the elastic shaft coupling can be made compact and lightweight, and the cylindrical member has a long life, so that the frequency of parts replacement can be reduced, and The tilt of the rotating shafts respectively connected to the first flange and the second flange is allowed.

Further, according to the second means, the cylindrical member elastically deformed in the torsional direction in response to the transmission torque is reduced in size and weight, and the first cross joint makes the inclination of the first flange with respect to the cylindrical member. Allow the elastic shaft coupling to be smaller and lighter, and because the cylindrical member has a long life, the frequency of parts replacement can be reduced and the inclination of the rotating shaft connected to the first flange can be reduced. Permissible.

According to the third means, the cylindrical member that elastically deforms in the torsional direction in response to the transmission torque is reduced in size and weight, so that the elastic shaft coupling can be reduced in size and weight. Since the cylindrical member has a long life, the frequency of parts replacement can be reduced.

Further, according to the fourth means, since the spline tube slides on the spline shaft and the distance between the flanges can be adjusted, the distance between the flanges can be adjusted depending on the position of the rotating shaft. You can easily adjust the distance.

Further, according to the fifth means, the cylindrical member elastically deforms in the bending direction corresponding to the inclination of the second flange, so that at least 1 in the shaft coupling that allows the inclination of the rotating shaft. Since two cross joints can be eliminated, the number of parts can be reduced and the elastic shaft joint can be made lighter.

According to the sixth means, the cylindrical member elastically deformed in the torsional direction in response to the transmission torque is reduced in size and weight, and the spring in the torsional direction can be obtained without increasing the distance between the flanges. By making it possible to reduce the constant, it is possible to reduce the size and weight of the elastic shaft joint, and since the cylindrical member has a long service life, it is possible to reduce the frequency of parts replacement, and to reduce the elastic shaft joint in the axial direction. It is possible to widen the setting range of the spring constant in the torsion direction without extending in the axial direction.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a first embodiment of an elastic shaft coupling of the present invention.

FIG. 2 is a side sectional view showing a second embodiment of the elastic shaft coupling of the present invention.

FIG. 3 is a side sectional view showing a third embodiment of the elastic shaft coupling of the present invention.

FIG. 4 is a side sectional view showing a fourth embodiment of the elastic shaft coupling of the present invention.

FIG. 5 is a side cross-sectional view of another example of the main part of the fourth embodiment of the present invention.

FIG. 6 is a perspective view of an example of a cylindrical member according to the present invention, taken along a direction orthogonal to an axis.

FIG. 7 is a side sectional view showing an example of a conventional elastic shaft coupling.

FIG. 8 is a perspective view of the elastic member shown in FIG.

[Explanation of symbols]

21 ... 1st cross joint, 22 ... 1st flange,
23 ... Spline shaft, 24 ... Second cross joint, 25 ... Second flange, 26,34 ... First fixed part, 27,36 ... Spline tube, 28,35,37 ... Second
Fixed part of 30, 30, 40 ... Cylindrical member, 50 ... Connecting member, 51
... third fixing portion, 52 ... fourth fixing portion, 53, 61 ... outer cylindrical member, 54, 62 ... inner cylindrical member, 63 ... connecting portion.

Claims (6)

[Scope of utility model registration request] 1. A first cross joint having a first flange fixed to one swing end, a second cross joint having a second flange fixed to one swing end, and glass fiber reinforced It is formed of a composite material of plastic or carbon fiber reinforced plastic or glass fiber reinforced plastic and carbon fiber reinforced plastic, and one end vicinity is in the first cross joint and the other end vicinity is in the second cross joint, respectively. An elastic shaft coupling comprising: a cylindrical member fixed by. 2. A first cross joint having a first flange fixed to one swing end, a second flange, glass fiber reinforced plastic or carbon fiber reinforced plastic, or glass fiber reinforced plastic and carbon fiber reinforced. An elastic shaft coupling formed of a plastic composite material, comprising: the cross joint near one end and a cylindrical member fixed near the other end to the second flange in the rotational direction. 3. A first flange, a second flange,
It is formed of glass fiber reinforced plastic, carbon fiber reinforced plastic, or a composite material of glass fiber reinforced plastic and carbon fiber reinforced plastic, and one end is fixed to the first flange and the other end is fixed to the second flange. And an elastic shaft coupling. 4. A spline shaft having a spline shaft projecting from the other swinging end of the first cross joint, and a fixing portion to which the spline shaft is fitted and which is externally fitted and fixed to the cylindrical member. The elastic shaft coupling according to claim 1 or 2, further comprising: 5. The elastic shaft coupling according to claim 2, wherein the cylindrical member is formed into a bellows shape by bending it in different directions alternately at a constant pitch in the length direction. 6. A first cross joint in which a first flange is fixed to one swing end and a spline shaft is fixed to the other swing end, and a second flange is fixed to one swing end. And a second cross joint in which the first fixing portion projects from the other swing end, the spline tube in which the spline shaft is fitted and the second fixing portion is formed on the outer peripheral surface, and glass fiber reinforced An outer cylindrical member formed of a composite material of plastic, carbon fiber reinforced plastic, glass fiber reinforced plastic and carbon fiber reinforced plastic, one end portion of which is externally fitted and fixed to the first fixing portion, and glass fiber reinforced plastic Or a composite material of carbon fiber reinforced plastic or glass fiber reinforced plastic and carbon fiber reinforced plastic, An inner shaft member inserted into the inner cylindrical member, the inner cylindrical member of which one end portion is externally fitted and fixed to the second fixing portion in the outer cylindrical member, and the other end portion of the inner cylindrical member and the outer cylindrical member. An elastic shaft coupling characterized by connecting and fixing the other end of the member.