JP3758149B2 - Toroidal continuously variable transmission - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a toroidal-type continuously variable transmission that can be used in a transmission for an automobile or the like.
[0002]
[Prior art]
For example, as a continuously variable transmission used in a vehicle such as an automobile, a double cavity type high torque toroidal continuously variable transmission disclosed in Japanese Patent Application Laid-Open No. 11-303961 and Japanese Patent Application Laid-Open No. 2000-18351 is known. It has been. As shown in FIG. 5, the toroidal continuously variable transmissions disclosed in these publications have two input disks 2, 2 and two output disks 3, 3 attached to the outer periphery of the input shaft 1. . An output gear 4 is rotatably supported on the outer periphery of the intermediate portion of the input shaft 1. Output disks 3 and 3 are connected to cylindrical flange portions 4a and 4a provided at the center of the output gear 4 by spline coupling.
[0003]
The input shaft 1 is rotationally driven by a drive shaft 22 via a loading cam type pressing device 12 provided between an input disk 2 and a cam plate 7 located on the left side in the drawing. Further, the output gear 4 is supported in the housing 14 via a partition wall 13 formed by coupling two members, whereby the output gear 4 can be rotated around the axis O, while the displacement in the axis O direction is reduced. It is blocked.
[0004]
The output disks 3 and 3 are rotatably supported around an axis O of the input shaft 1 by rolling bearings 5 and 5 interposed between the output disks 1 and 3. As the rolling bearings 5 and 5, for example, cage and rollers 5 and 5 disclosed in Japanese Patent Application Laid-Open No. 2000-74071 are used. The cage and roller 5 disclosed in this publication is composed of a roller 5a and a cage (cage) 5b that positions and holds the roller 5a on a predetermined pitch circle.
[0005]
Further, the left input disk 2 in the figure is supported by the input shaft 1 via a ball spline 6, and the right input disk 2 in the figure is spline-coupled to the input shaft 1, and these input disks 2 are input shafts. It rotates with 1. A power roller 11 is rotatably held between the inner surfaces (concave surfaces) 2a and 2a of the input disks 2 and 2 and the inner surfaces (concave surfaces) 3a and 3a of the output disks 3 and 3.
[0006]
A step 2b is provided on the inner peripheral surface 2c of the input disk 2 located on the right side in FIG. 5, and the step 1b provided on the outer peripheral surface 1a of the input shaft 1 is abutted against the step 2b. The back surface of the input disk 1 (the right surface in FIG. 5) is abutted against the loading nut 9. Thereby, the displacement of the input disk 2 in the axial direction (left-right direction in FIG. 5) with respect to the input shaft 1 is substantially prevented. Further, a disc spring 8 is provided between the input disc 2 located on the left side in FIG. 5 and the cam plate 7, and this disc spring 8 has a concave surface 2 a of each disc 2, 2, 3, 3, A pressing force is applied to the abutting portions between 2a, 3a, 3a and the peripheral surfaces 11a, 11a of the power rollers 11, 11.
[0007]
Therefore, in the continuously variable transmission configured as described above, when a rotational force is input from the drive shaft 22 to the input shaft 1, the input disks 2, 2 rotate integrally with the input shaft 1, and the rotation of the input disks 2, 11 Is transmitted to the output disks 3 and 3 at a constant gear ratio. The rotation of the output disks 3 and 3 is transmitted from the output gear 4 to an output shaft (not shown) via a transmission gear (not shown).
[0008]
To assemble the toroidal-type continuously variable transmission shown in FIG. 5, cage and rollers 5 and 5 are attached to the inner peripheral surfaces 3c and 3c of the output disks 3 and 3, the left input disk 2, the left output disk 3, The input shaft 1 is inserted in the order of the flange portion 4a of the output gear 4, the right output disk 3, and the right input disk 2. Then, the stepped portion 1b of the input shaft 1 is abutted against the stepped portion 2b of the right input disk 2 to regulate the position of the input disk 2 in the axis O direction, and then the loading nut 9 is attached to the rear surface of the right input disk 2. Tighten from the side.
[0009]
[Problems to be solved by the invention]
However, in such a conventional toroidal type continuously variable transmission, when the input shaft 1 is inserted into the output disks 3 and 3, the cage and rollers attached to the inner peripheral surfaces 3c and 3c of the output disks 3 and 3 are used. Since the rollers 5a and 5a of 5 and 5 are lowered by gravity, the stepped portion 1b of the input shaft 1 and the roller 5a interfere with each other, so that the input shaft 1 is inserted into the output disks 3 and 3. It was difficult and assembly work was difficult.
[0010]
In particular, as disclosed in Japanese Patent Laid-Open No. 11-303961, a plurality of cage and rollers are attached to the inner peripheral surfaces 3c and 3c of the output disks 3 and 3, and the output disks 3 and 3 are connected to the input shaft 1 when assembled. If the input shaft 1 is not fixed in the radial direction, the input shaft 1 must be inserted while aligning the axial centers of the input shaft 1 and the output shaft, which makes the assembly work more difficult.
[0011]
The right input disk 2 is restricted from moving in the direction of the axis O by the contact between the stepped portion 2b and the stepped portion 1b formed on the outer peripheral surface of the input shaft 1. Since the contact area between the stepped portion 1b of the shaft 1 and the stepped portion 2b of the input disk 2 is small, the pressure (surface pressure) applied to the contacted portion increases, so that the durability of the input disk 2 and the input shaft 1 is increased. As a result, the life of the toroidal continuously variable transmission is reduced.
[0012]
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a toroidal continuously variable transmission that can easily perform assembling work and can prevent a reduction in life.
[0013]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 is directed to an input shaft to which a rotational force is input, and a nut member that is in contact with the nut member from the back side to prevent movement to the back side. A toroidal continuously variable transmission comprising: an input disk that rotates integrally with a shaft; and an output disk that is supported by the input shaft via a rolling bearing and that transmits the rotational force of the input disk via a power roller. A taper portion is formed on the outer peripheral surface of the input shaft such that the thickness gradually decreases in the insertion direction of the input shaft, and the taper portion is formed on the inner peripheral surface of the input disk. The input shaft is splined to the input disk, and a clearance groove is formed between the spline groove of the input shaft and the minimum diameter portion of the tapered portion of the input shaft. that you are And butterflies.
[0014]
In the first aspect of the present invention, the roller provided on the inner peripheral surface side of the output disk is formed by forming a tapered portion on the outer peripheral surface of the input shaft so that the thickness gradually decreases in the insertion direction. Even when the roller (roller) and needle of the bearing are lowered by gravity, the tapered portion of the input shaft pushes up the roller and needle of the rolling bearing, so that the input shaft can be smoothly inserted into the output disk.
[0015]
For this reason, it is not necessary to insert the input shaft into the output disc while pushing up the rollers and needles of the rolling bearings using a jig such as a screwdriver. Can be shortened and the assembly cost can be reduced. Further, since it is not necessary to reduce the diameter of the input shaft in order to avoid interference with the rollers and needles of the rolling bearing, it is possible to prevent a decrease in the strength of the input shaft.
[0016]
Furthermore, the tapered portion of the outer peripheral surface of the input shaft and the tapered portion of the input disc are fitted together, and the nut member is brought into contact with the input disc from the back side, and the input disc is sandwiched between the tapered portion of the input shaft and the nut member. It is possible to prevent rattling of the input disk and to accurately regulate the position of the input disk on the input shaft. In addition, the pressure applied to the contact surface is reduced by increasing the contact area between the outer peripheral surface of the input shaft and the inner peripheral surface of the input disk as compared to the conventional fitting by the stepped portion. The durability of the input shaft is improved and the life of the toroidal continuously variable transmission can be prevented from being reduced.
[0018]
In addition , since the taper portion of the input shaft and the clearance groove are smoothly connected by the continuous minimum diameter portion of the taper portion and the clearance groove of the input shaft, concentrated stress is unlikely to occur at this connection portion. The durability of the input shaft is further improved.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. The feature of the present invention is that the fitting portion of the input shaft and the input disk is improved, and other configurations and operations are the same as the conventional configurations and operations described above. Only the characteristic parts will be referred to, and the other parts will be denoted by the same reference numerals as those in FIG. 5 and detailed description thereof will be omitted.
[0020]
1 to 3 show an embodiment of the present invention. As shown in the figure, the wall thickness gradually decreases in the insertion direction (arrow A direction) of the input shaft 1 on the outer peripheral surface 1a of the input shaft 1 constituting the toroidal-type continuously variable transmission according to the present embodiment. Such a tapered portion 1c is formed. In addition, on the outer peripheral surface 1a of the input shaft 1, a minimum diameter portion 1d of the tapered portion 1c and a clearance groove 1e formed in the circumferential direction of the input shaft 1 are continuously formed, and the clearance groove 1e A spline groove (key groove) 1 f is formed continuously. As described above, since the minimum diameter portion 1d of the tapered portion 1c of the input shaft 1 and the relief groove 1e are continuously formed, the taper portion 1c and the relief groove 1e are smoothly connected. Stress becomes difficult to concentrate on the portion, and the durability of the input shaft 1 is improved.
[0021]
A taper portion 2 e formed on the insertion side of the inner peripheral surface 2 of the input disk 2 is fitted to the taper portion 1 c of the input shaft 1. Further, a spline groove (key groove) 2d is formed on the inner peripheral surface 2c of the input disk 2 on the loading nut (nut member) 9 side. The spline groove 2d and the spline groove 1f of the input shaft 1 are used for input. The disk 2 and the input shaft 1 are splined.
[0022]
Since the tapered portion 1c is formed on the input shaft 1, the cage provided on the inner peripheral surface 3c side of the output disk 3 when the input shaft 1 is inserted into the output disk 3, as shown in FIGS. Even if the roller 5a of the AND roller (rolling bearing) 5 is lowered due to gravity, the tapered portion 1c of the input shaft 1 causes the roller 5a to move outwardly in the radial direction of the output disk 3 (in the direction of arrow B in FIG. 3). ).
[0023]
Therefore, since the roller 5a does not hinder the insertion of the input shaft 1 and the input shaft 1 can be smoothly inserted into the output disk 3, the input shaft 1 can be pushed up while pushing up the roller 5a using a jig such as a screwdriver. Need not be inserted into the output disk 3. As a result, an easy and efficient assembling work can be performed, and the assembling time can be shortened and the assembling cost can be reduced. Further, since it is not necessary to reduce the diameter of the input shaft 1 in order to avoid interference between the cage and roller 5 and the roller 5a, it is possible to prevent a decrease in strength of the input shaft 1.
[0024]
On the other hand, the taper portion 1c of the input shaft 1 and the taper portion 2e of the inner peripheral surface 2c of the input disk 2 are fitted, and the loading nut 9 is abutted from the back side of the input disk 2 to thereby taper the input shaft 1 Since the input disk 2 is sandwiched between 1 c and the loading nut 9, rattling of the input disk 2 can be prevented, and the position of the input disk 2 on the input shaft 1 can be regulated with high accuracy. In addition, since the contact area between the taper portion 1c of the input shaft 1 and the inner peripheral surface 2c of the input disk 2 is increased as compared with the conventional stepped portion, the pressure applied to the contact surface is reduced. 2 and the durability of the input shaft 1 are improved, and the life of the toroidal-type continuously variable transmission can be prevented from being reduced.
[0025]
In addition, this invention is not limited to the said embodiment, A various deformation | transformation is possible in the range which does not deviate from the summary. For example, as shown in FIG. 4, the taper portion 1c of the input shaft 1 may be formed by chamfering the corner portion between the outer peripheral surface 1a of the input shaft 1 and the escape groove 1e. Even in this case, since the tapered portion 1c pushes up the roller 5a of the cage and roller 5, the input shaft 1 can be smoothly inserted into the output disk 3.
[0026]
In the above embodiment, the half-toroidal continuously variable transmission has been described. However, the present invention is not limited to this and can be applied to a full toroidal continuously variable transmission. Further, in the above embodiment, the cage and roller 5 is used as the rolling bearing for supporting the output disk 3 on the input shaft 1, but the present invention is not limited to this, and a needle bearing or a roller bearing is used as the rolling bearing. Also good.
[0027]
【The invention's effect】
As described above, according to the first aspect of the present invention, an easy and efficient assembling operation can be performed, and the assembling time can be shortened and the assembling cost can be reduced. Further, the durability of the input disk and the input shaft is improved, and the life of the toroidal continuously variable transmission can be prevented from being reduced.
[0028]
In addition , since the taper portion of the input shaft and the relief groove are smoothly connected, it is difficult for stress to concentrate on this connection portion, and the durability of the input shaft is further improved.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a state where an input disk is attached to an input shaft according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view showing a state where an input shaft is inserted into an output disk.
FIG. 3 is a cross-sectional view showing a state where a tapered portion of an input shaft pushes up a roller.
FIG. 4 is a cross-sectional view showing a state where a tapered portion of an input shaft according to a modification pushes up a roller.
FIG. 5 is a cross-sectional view showing a conventional toroidal-type continuously variable transmission.
[Explanation of symbols]
1 Input shaft 1a Input shaft outer peripheral surface 1c Input shaft taper portion 1f Input shaft spline groove 2 Input disk 2c Input disk inner peripheral surface 2e Input disk taper portion 3 Output disk 5 Cage and roller (rolling bearing)
9 Loading nut (nut member)
11 Power Roller

Claims (1)

An input shaft to which rotational force is input, an input disk that is brought into contact with the nut member from the back side to be prevented from moving to the back side, rotates together with the input shaft, and the input via a rolling bearing In a toroidal continuously variable transmission that is supported by a shaft and includes an output disk to which the rotational force of the input disk is transmitted via a power roller,
A tapered portion is formed on the outer peripheral surface of the input shaft so that the thickness gradually decreases in the insertion direction of the input shaft, and a tapered portion formed on the inner peripheral surface of the input disk is formed on the tapered portion. Mated ,
The input shaft is splined to the input disk, and a clearance groove is formed between the spline groove of the input shaft and the minimum diameter portion of the tapered portion of the input shaft. Toroidal continuously variable transmission.

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