JP2003021206A - Toroidal type continuously variable transmission - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To improve the durability of a flange portion of an input shaft while avoiding an increase in the size and weight of a transmission, and to improve poor engagement of an output gear formed on the flange portion and irregularities. Provided is a toroidal-type continuously variable transmission that can suppress generation of noise and the like. SOLUTION: An input disk 14 of a flange 6a of an input shaft 6 is provided.
On the side, a taper portion 30 is formed such that the thickness gradually increases as the distance from the power roller 18 increases, and the input disk 14 having the inner peripheral surface 14a tapered is fitted into the taper portion 30. ing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a toroidal type continuously variable transmission used as, for example, a transmission for an automobile.

[0002]

2. Description of the Related Art A power circulation type continuously variable transmission that uses a toroidal type variator and a planetary gear device in combination to differentially utilize output gears, for example, a gear neutral type disclosed in Japanese Patent Laid-Open No. 9-89071. And Japanese Patent Laid-Open No. 10-19675
There is a toroidal type continuously variable transmission such as the power split type described in Japanese Patent No.

In these toroidal type continuously variable transmissions, the power from the power source must be divided into a path that passes through the variator and a path that does not. Various layouts have been developed to realize this, and one of them is the technology of the double-cavity toroidal type continuously variable transmission described in Japanese Patent Publication No. 6-502476. ing.

The technique disclosed in Japanese Patent Publication No. 6-502476 will be described with reference to FIG. In FIG. 3, reference numerals 2 and 4 are first and second variators. The first variator 2 is arranged coaxially with the input shaft 6, and is input to the input disc 8 that is ball-spline-coupled to the input shaft 6 and rotates together with the input shaft 6. An output disc 10 rotatably supported by an input shaft 6
And a power roller 12 rollingly contacting these input / output disks 8 and 10. The second variator 4 is arranged coaxially with the input shaft 6, and is spline-coupled to the input shaft 6 and rotates with the input shaft 6. The output disc 1 rotatably supported by the input shaft 6
6 and a power roller 18 rollingly contacting the input / output disks 14 and 16.

The input / output disks 8, 10, 14, 16 are
Each of them is formed to have a traction surface having an arcuate cross section, and these traction surfaces are provided in a state of facing each other. A plurality of power rollers 12, 18 are provided between the input / output disks 8, 10, 14, 16.
The power rollers 12 and 18 are tiltably supported by a pivot serving as the center of curvature of the traction surface, and are in contact with the traction surface.

A first output gear 20 is provided on the rear surface side of the input disc 14 of the second variator 4, and between the output disc 10 of the first variator 2 and the output disc 16 of the second variator 4. A second output gear 22 is provided. The first output gear 20 meshes with the gear of the planetary gear mechanism. Then, the rotational speeds of the output disks 10 and 16 of the first and second variators 2 and 4 change according to the tilt angles of the power rollers 12 and 18, and the transmission force to the output shaft (not shown) changes.

Therefore, the first output gear 20 is an output gear that transmits the power from the power source to the output shaft without passing through the first and second variators 2 and 4, and the second output gear 2
2 is the first and second variators 2, 4 for supplying the power from the power source.
Is an output gear that passes through and is transmitted to the output shaft.

FIG. 4 is a diagram showing the vicinity of the second variator 4. A flange portion 6 a is formed at an end portion of the input shaft 6 on the input disk 14 side, and a side surface of the flange portion 6 a is in contact with a back surface of the input disk 14. A first output gear 20 is formed integrally with the collar 6a at the center of the outer periphery of the collar 6a. The first output gear 20 and the collar portion 6a of the input shaft 6 may be integrally formed, or may be a separate gear 20.
May be integrated with the collar 6a. A corner portion 24 is formed at a joint portion between the flange portion 6a of the input shaft 6 and the fitting portion 6b of the input shaft 6 fitted to the inner peripheral surface of the input disk 14.

[0009] In addition, as shown in FIG. 3, the second output gear
22 has an output disc on each side of the collar 22a.
It is in contact with the back surface of the wheels 10, 16. Also, the second output
Both ends of the force gear 22 have output disks 10, 16 respectively.
Inserted inside the
Cylindrical fitting part 22 that is connected by line connection
b and 22b are fitted to the inner peripheral surfaces of the output discs 10 and 16.
As a result, the second output gear 22 is
While rotating with the discs 10 and 16,
Is relatively rotatable. Tsuba of the second output gear 22
The corner portion is formed at the joint portion between the portion 22a and the fitting portions 22b and 22b.
26 is formed.

A hydraulic pressing device 28 is provided at the end of the input shaft 6 on the back side of the input disk 8 to press the input disk 8 from the back side toward the output disk 10 and 6 is pulled in a direction opposite to the pressing direction of the input disk 8 (leftward in FIG. 3). Therefore, a pressure is applied between the input / output disks 8 and 10 and the power roller 12 and between the input / output disks 14 and 16 and the power roller 18 by the loading force of the pressing device 28.

[0011]

By the way, the pressing device 2
Loading force (axial force) generated by hydraulic pressure of 8
Is very large (for example, about 6 for passenger cars)
In order to make the collar portion 6a of the input shaft 6 which receives the reaction force of the loading force on the opposite side of the pressing device 28 have sufficient durability, it is necessary to increase the thickness of the collar portion 6a. . In particular, as shown in FIG. 4, when the power roller 18 contacts near the outer peripheral portion of the input disc 14, the power roller 18 pushes the outer peripheral side of the input disc 14 (the arrow A in FIG. 4) to cause the input shaft to move. A large pushing force acts on the collar portion 6a of 6 in the direction along the input shaft 6 (the direction of the arrow B in FIG. 4). Due to this force, bending stress is concentratedly applied to the corner portion 24 of the input shaft 6. When a large bending stress is applied to the corner portion 24 in this way, the first output gear 20 formed on the outer peripheral portion of the collar portion 6a is greatly deformed, and thus there is a possibility that defective meshing, abnormal noise, or the like may occur. Therefore, it is conceivable to increase the wall thickness of the collar portion 6a as shown by the dimension t in FIG. 4, but if the wall thickness of the collar portion 6a is increased in this way,
The length of the transmission in the axial direction becomes long and the transmission becomes large, and the weight also increases.

Further, in the case of the single-cavity toroidal type continuously variable transmission, the loading force of the pressing device also acts on the output gear, so that the power roller outputs the same as in the case of the collar portion 6a of the input shaft 6. When the bending stress concentrates on the corners of the output gear due to the force pushing the outer peripheral side of the disk, the output gear is greatly deformed, which may result in defective meshing or abnormal noise. If the wall thickness of the flange portion of the output gear is increased in order to prevent this, the axial length of the transmission becomes longer, which causes a problem of upsizing and weight increase.

In the case of a toroidal type continuously variable transmission of the type in which the first output gear 20 is not formed on the collar portion 6a of the input shaft 6 and only the collar portion 6a is formed and power is not circulated. Also, a large bending stress acts on the corner portion 24 of the collar portion 6a. Therefore, also in the case of this type of toroidal type continuously variable transmission, if the wall thickness of the collar portion 6a is increased in order to cope with this, the axial length of the transmission becomes longer, resulting in an increase in size and an increase in weight. Has the problem of inviting

The present invention has been made in view of the above circumstances, and is a toroidal type continuously variable transmission capable of improving the durability of the collar portion of the input shaft while avoiding an increase in the size and weight of the transmission. The purpose is to provide. Further, the present invention can improve the durability of the collar portion of the input shaft while avoiding the increase in size and weight of the transmission, and at the same time, prevent the meshing of the output gear formed in the collar portion, abnormal noise, etc. An object of the present invention is to provide a toroidal type continuously variable transmission that can suppress the occurrence. In addition, the present invention can improve the durability of the flange portion of the output gear while avoiding the increase in size and weight of the transmission, and can suppress the occurrence of improper meshing of the output gear and abnormal noise. An object of the present invention is to provide a toroidal type continuously variable transmission that can be used.

[0015]

In order to achieve the above object, a toroidal type continuously variable transmission according to a first aspect of the present invention has an input shaft which is rotationally driven by a power source and a power based on the rotation of the input shaft. An output shaft for taking out and a variator arranged between the input shaft and the output shaft are provided, and the variator has a traction surface having an arcuate cross section and abuts on a flange portion of the input shaft from a rear side. Input disc that is prevented from moving to the rear side and rotates together with the input shaft, an output disc that is disposed coaxially with the input disc and that has a traction surface having an arcuate cross section, the input disc and the output disc In a toroidal type continuously variable transmission that is tiltably provided between the input shaft and the power roller and is in contact with the traction surface. A tapered portion as the thickness increases gradually formed with distance from the tapered portion, and wherein the fitted input disk to the inner peripheral surface has a tapered surface shape.

According to the first aspect of the present invention, since the taper portion is formed on the flange portion and the taper portion is fitted to the inner peripheral surface of the input disk having the taper surface shape, the axial direction of the variator is reduced. The wall thickness of the root portion of the collar portion can be secured without increasing the length. Therefore, the durability of the collar portion of the input shaft can be improved without increasing the axial length of the transmission and without increasing the weight. Further, even if the power roller comes into contact with the outer peripheral portion of the input disc, the force acting on the tapered surface of the taper portion of the collar portion along the input shaft due to the force of the power roller pushing the outer peripheral side of the input disc. Since it does not act in the direction but in the direction intersecting the input shaft, the bending stress acting on the flange becomes small, and in this respect also, the durability of the flange of the input shaft can be enhanced. Further, since the taper portion of the collar portion of the input shaft is fitted to the inner peripheral surface of the tapered surface shape of the input disc, the input shaft and the rotation shaft of the input disc can be made more coincident with each other.

A toroidal continuously variable transmission according to a second aspect of the present invention includes an input shaft that is rotationally driven by a power source, an output shaft that extracts power based on the rotation of the input shaft, the input shaft and the output shaft. And a variator that is disposed between the input shaft and the variator, the variator having a traction surface having an arcuate cross-section, being abutted against the flange portion of the input shaft from the rear side, and being prevented from moving to the rear side. An input disc that rotates together with the input disc; an output disc that is arranged coaxially with the input disc and that has a traction surface with an arcuate cross section; and a traction surface that is tiltably provided between the input disc and the output disc. Troy having a power roller for rolling contact with the output shaft, and an output gear for transmitting power from a power source to the output shaft without passing through the variator at the collar portion of the input shaft. In the le-type continuously variable transmission, a taper portion is formed in the flange portion of the input shaft so that the wall thickness gradually increases as the distance from the power roller increases, and the inner peripheral surface of the taper portion has a tapered surface shape. It is characterized in that the input disk is fitted.

According to the second aspect of the present invention, since the taper portion is formed on the flange portion and the taper portion is fitted to the inner peripheral surface of the taper surface shape of the input disk, the axial direction of the variator is reduced. The wall thickness of the root portion of the collar portion can be secured without increasing the length. Therefore, the durability of the collar portion of the input shaft can be improved without increasing the axial length of the transmission and without increasing the weight. Further, even if the power roller comes into contact with the outer peripheral portion of the input disc, the force acting on the tapered surface of the taper portion of the collar portion along the input shaft due to the force of the power roller pushing the outer peripheral side of the input disc. Since it does not act in the direction but in the direction intersecting the input shaft, the bending stress acting on the flange becomes small, and in this respect also, the durability of the flange of the input shaft can be enhanced. Further, as described above, since the flange portion of the input shaft is less likely to be bent and deformed, the deformation of the output gear formed in this flange portion is also suppressed, so that the occurrence of improper meshing or abnormal noise of the output gear is suppressed. be able to. Further, since the taper portion of the collar portion of the input shaft is fitted to the inner peripheral surface of the tapered surface shape of the input disc, the input shaft and the rotation shaft of the input disc can be made more coincident with each other.

A toroidal continuously variable transmission according to a third aspect of the present invention includes an input shaft that is rotationally driven by a power source, an output shaft that extracts power based on the rotation of the input shaft, the input shaft and the output shaft. A variator disposed between the input disc and the input disc rotating with the input shaft, the variator having a traction surface having an arcuate cross section, and a traction surface having an arcuate cross section arranged coaxially with the input disc. And a power roller tiltably provided between the input disk and the output disk and rollingly contacting the traction surface, the output disk having a flange on the back side of the output disk. Part abuts to prevent movement of the output disc to the back side,
In a toroidal type continuously variable transmission provided with an output gear that rotates together with an output disc and transmits power to the output shaft, the collar portion of the output gear has a wall thickness that gradually increases with distance from the power roller. It is characterized in that a tapered portion is formed and an output disk having an inner peripheral surface having a tapered surface shape is fitted into the tapered portion.

According to the third aspect of the present invention, since the taper portion of the flange portion of the output gear is fitted to the inner peripheral surface of the tapered surface of the output disc, the rotation shafts of the output gear and the output disc are made to coincide with each other. be able to.

Further, in the single cavity type toroidal type continuously variable transmission, a taper portion is formed on the flange portion of the output gear, and the taper portion is fitted to the inner peripheral surface of the taper surface shape of the output disk. Therefore, the wall thickness of the root portion of the flange portion of the output gear can be secured without increasing the axial length of the variator. Therefore, the durability of the collar portion of the output gear can be improved without increasing the axial length of the transmission and without increasing the weight. Even if the power roller comes into contact with the outer peripheral portion of the output disc, the force exerted on the tapered surface of the flange portion of the output gear by the force of the power roller pushing the outer peripheral side of the output disc is Since it does not act in the direction along the rotation axis of the disc but in the direction intersecting with the rotation axis of the output disc, the bending stress acting on the collar portion of the output gear becomes small. The durability of the collar part can be improved. Further, as described above, since the collar portion of the output gear is less likely to be bent and deformed, the deformation of the output gear is suppressed, so that it is possible to suppress the occurrence of improper meshing of the output gear and abnormal noise.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are views showing a double-cavity toroidal type continuously variable transmission according to the present embodiment. 1 and 2, the same components as those shown in Figs. 3 and 4 are designated by the same reference numerals, and the description thereof will be omitted. In the present embodiment, the power roller 1 is provided on the input disk 14 side of the collar portion 6a of the input shaft 6.
A tapered portion 30 is formed so that the wall thickness gradually increases as the distance from 8 increases, and a first output gear (output gear) 20 is formed on the outer peripheral portion of the flange portion 6a opposite to the input disk 14. Has been formed. On the input shaft 6, a spline portion is formed continuously from the smallest diameter portion of the taper portion 30 of the collar portion 6a. The input disk 14 having the tapered inner surface 14a is fitted in the tapered portion 30 of the collar 6a. Here, the back surface of the input disk 14 is not in contact with the second output gear 20. Further, a spline portion is formed on the inner peripheral surface of the input disc 14 on the output disc 16 side, and this spline portion is spline-coupled to the spline portion of the input shaft 6.

Further, on the side of the output discs 10 and 16 of the flange portion 22a of the second output gear (output gear) 22, respectively,
The tapered portions 40, 40 are formed so that the wall thickness gradually increases as the distance from the power rollers 12, 18 increases. Further, the second output gear 22 is formed with spline portions which are continuous from the smallest diameter portions of the respective taper portions 40, 40 of the collar portion 22a. Then, the output disks 10 and 16 having the inner peripheral surfaces 10a and 16a having a tapered surface shape are fitted to the respective tapered portions 40 and 40 of the flange portion 22a. Further, the spline portion of the second output gear 22 is
The output discs 10 and 16 are spline-coupled to the spline portions formed continuously on the inner peripheral surfaces 10a and 16a.

In the toroidal type continuously variable transmission configured as described above, the flange portion 6a of the input shaft 6 has the taper portion 30.
And the tapered portion 30 is fitted to the tapered inner peripheral surface 14a of the input disk 14,
The wall thickness of the root portion of the collar portion 6a can be secured without increasing the axial length of the second variator 4.
Therefore, the collar portion 6 of the input shaft 6 is not increased without increasing the axial length of the transmission and without increasing the weight.
The durability of a can be improved. Further, as shown in FIG. 2, even if the power roller 18 contacts near the outer peripheral portion of the input disk 14, the power roller pushes the outer peripheral side of the input disk (arrow C in FIG. 2) to the flange portion. 6a
The force acting on the tapered surface of the tapered portion 30 does not act in the direction along the input shaft, but in the direction intersecting the input shaft 6 (the direction of the arrow D in FIG. 2). Since the bending stress acting on the portion 6a is reduced, the durability of the collar portion 6a of the input shaft 6 can be improved also in this respect. Further, as described above, since the collar portion 6a of the input shaft 6 is less likely to be bent and deformed, the deformation of the first output gear 20 formed on the collar portion 6a is also suppressed, and thus the first output gear 2
It is possible to suppress the occurrence of meshing failure of 0, abnormal noise, and the like. Further, since the taper portion 30 of the flange portion 6a of the input shaft 6 is fitted to the tapered inner peripheral surface 14a of the input disk 14, the rotation axes of the input shaft 6 and the input disk 14 can be made more coincident with each other.

Further, in this toroidal type continuously variable transmission, the taper portion 4 of the collar portion 22a of the second output gear 22 is used.
Since 0 and 40 are fitted to the tapered inner peripheral surfaces 10a and 16a of the output discs 10 and 16, the rotation axes of the second output gear 22 and the output discs 10 and 16 can be made more coincident with each other.

Further, in the case of a single-cavity toroidal type continuously variable transmission, a taper portion is formed on the flange portion of the output gear, and this taper portion is fitted to the inner peripheral surface of the taper surface shape of the output disk. In this case, the wall thickness of the root portion of the collar portion of the output gear can be secured without increasing the axial length of the variator. Therefore, the durability of the collar portion of the output gear can be improved without increasing the axial length of the transmission and without increasing the weight. Even if the power roller comes into contact with the outer peripheral portion of the output disc, the force exerted on the tapered surface of the flange portion of the output gear by the force of the power roller pushing the outer peripheral side of the output disc is Since it does not act in the direction along the rotation axis of the disc but in the direction intersecting with the rotation axis of the output disc, the bending stress acting on the collar portion of the output gear becomes small. The durability of the collar part can be improved. Further, as described above, since the collar portion of the output gear is less likely to be bent and deformed, the deformation of the output gear is suppressed, so that it is possible to suppress the occurrence of improper meshing of the output gear and abnormal noise.

Although the half toroidal type continuously variable transmission has been described in the above embodiment, the present invention is not limited to this and can be applied to a full toroidal type continuously variable transmission. Further, in the above-described embodiment, the power circulation type continuously variable transmission has been described, but the present invention is not limited to this, and the first output gear 20 is not formed in the collar portion 6a of the input shaft 6, The present invention can be applied to the case of a toroidal type continuously variable transmission in which only the collar portion 6a is formed and power is not circulated.

[0028]

As described above, according to the toroidal type continuously variable transmission of the first aspect, the durability of the collar portion of the input shaft is improved while avoiding an increase in the size and weight of the transmission. be able to. Further, the input shaft and the rotation shaft of the input disk can be made more coincident with each other.

According to the toroidal type continuously variable transmission of the second aspect, the durability of the flange portion of the input shaft can be improved while avoiding an increase in the size and weight of the transmission.
In addition, it is possible to suppress the occurrence of improper meshing of the output gear formed in the collar portion, abnormal noise, and the like. Further, the input shaft and the rotation shaft of the input disk can be made more coincident with each other.

According to the toroidal type continuously variable transmission of the third aspect, the rotation shafts of the output gear and the output disk can be made more coincident with each other. Further, particularly in the single cavity type, the durability of the collar portion of the output gear can be improved while avoiding an increase in size and weight of the transmission. In addition, it is possible to suppress the occurrence of improper meshing of the output gear and abnormal noise.

[Brief description of drawings]

FIG. 1 is a diagram showing a double-cavity toroidal type continuously variable transmission according to an embodiment of the present invention.

FIG. 2 is a diagram showing a structure of a second variator.

FIG. 3 is a diagram showing a conventional double-cavity toroidal continuously variable transmission.

FIG. 4 is a diagram showing a structure of a second variator.

[Explanation of symbols]

2 First variator 4 second variator 6 input shaft 6a collar part 10, 16 output disc 10a, 16a inner peripheral surface 12, 18 Power roller 14 Input disc 14a inner peripheral surface 20 First output gear (output gear) 22 Second output gear (output gear) 22a collar part 30 taper 40 taper

Claims (3)

[Claims] 1. An input shaft rotationally driven by a power source,
An output shaft that extracts power based on the rotation of the input shaft, and a variator that is arranged between the input shaft and the output shaft, the variator having a traction surface having an arcuate cross-section, and An input disk, which comes into contact with the collar portion from the back side and is prevented from moving to the back side, and rotates together with the input shaft, and an output disk having a traction surface coaxially arranged with the input disk and having an arc-shaped cross section. And a power roller tiltably provided between the input disc and the output disc and rollingly contacting the traction surface, the toroidal type continuously variable transmission comprising: The taper part is formed so that the wall thickness gradually increases with increasing distance from the A characteristic toroidal type continuously variable transmission. 2. An input shaft rotatably driven by a power source,
An output shaft that extracts power based on the rotation of the input shaft, and a variator that is arranged between the input shaft and the output shaft, the variator having a traction surface having an arcuate cross-section, and An input disk, which comes into contact with the collar portion from the back side and is prevented from moving to the back side, and rotates together with the input shaft, and an output disk having a traction surface coaxially arranged with the input disk and having an arc-shaped cross section. And a power roller tiltably provided between the input disk and the output disk and rollingly contacting the traction surface, and the flange portion of the input shaft allows the power from the power source to pass through the variator. In a toroidal type continuously variable transmission in which an output gear that transmits to the output shaft is formed without a change, the flange portion of the input shaft has a wall thickness that gradually increases with distance from the power roller. A toroidal-type continuously variable transmission characterized in that an increasing number of tapered portions are formed, and an input disk having an inner peripheral surface having a tapered surface shape is fitted into the tapered portions. 3. An input shaft rotatably driven by a power source,
An output shaft that extracts power based on the rotation of the input shaft, and a variator that is disposed between the input shaft and the output shaft, the variator having a traction surface having an arcuate cross-section and together with the input shaft. A rotating input disc, an output disc coaxially arranged with the input disc and provided with a traction surface having an arcuate cross section, a tiltingly provided between the input disc and the output disc, and on the traction face. A power roller for rolling contact with the output disc, and a flange portion of the output disc abuts against the output disc to prevent the output disc from moving to the back side, and the power is output by rotating together with the output disc. In a toroidal type continuously variable transmission provided with an output gear that transmits to a shaft, a collar portion of the output gear is separated from the power roller. A toroidal continuously variable transmission characterized in that a tapered portion whose thickness gradually increases is fitted to an output disk having an inner peripheral surface having a tapered surface shape.