JPS6128121Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of a power roller used in a toroidal transmission.

Toroidal transmissions are disclosed, for example, in U.S. Pat. No. 3,163,051.
As shown in the specification, a toroidal cavity is formed by the opposing toroidal surfaces of an input disk and an output disk provided on an input shaft and an output shaft, respectively, arranged on the same axis, and several power rollers supported by thrust bearings are arranged within the cavity.
More specifically, an inner ring fixed to the roller shaft;
Rolling elements are arranged on the raceway surface of the inner ring, and an outer ring which rolls freely at high speed around the inner ring via the rolling elements forms the thrust bearing. The outer peripheral surface of the outer ring is partially spherical and forms the power roller, and the partially spherical outer peripheral surface of this power roller engages with the toroidal opposing surfaces of the input disk and output disk, respectively.

In a toroidal transmission with such a structure, by adjusting the contact angle of the power roller with the input/output disk, the radius of each engagement circle with the input/output disk changes in relation to each other, and the input shaft and output The speed ratio between the shafts can be adjusted steplessly.

Since this transmission has the above-mentioned structure, the power roller always transmits the torque at the engagement point (one point each for the input and output disks, two points in total) in order to transmit the torque between the input and output shafts. a large thrust in the axial direction of the roller shaft supporting the roller;
The power roller, which rotates around the roller axis, will be subjected to a large load due to the combination of the radial load caused by the traction force and the moment load generated by the above-mentioned combined load, and the power roller will tend to tilt with respect to the roller axis. At the same time, the power roller is deformed into an elliptical shape due to a concentrated large load applied to the engagement point of the power roller, and the problem is that the life of the thrust bearing is significantly shortened, and problems such as rotational failure or seizure are likely to occur. Therefore, improving the rigidity of the power roller and supporting parts has become an important issue.

This idea solves the above-mentioned problems with conventional products, and improves the rigidity of the power roller, thus preventing the life of the bearings that support the power roller from decreasing and improving the performance of the transmission. It provides rollers.

Next, embodiments of this invention will be described in detail with reference to the drawings.

FIG. 1 shows the main parts of a toroidal transmission incorporating a power roller according to a first embodiment of the present invention, and an input shaft 6a and an output shaft 7a arranged on the same axis each have an input disk 61a. and an output disk 71a are fixedly installed, and a toroidal cavity is formed between the toroidal opposing surfaces of these input and output disks as shown.

The cavity has an inner raceway surface for a tapered roller bearing as a support bearing, and has a partially spherical outer circumferential surface that can freely roll at high speed and rotate around an inner ring 2a mounted on a roller shaft 3a via rolling elements 4a. Several power rollers 1a are arranged, and the outer peripheral surface of the power roller 1a is engaged with the opposing surfaces of the input disk 61a and the output disk 71a, and the contact angle of the power roller 1a is adjusted. The structure is such that the speed ratio of the input shaft 6a and the output shaft 7a can be adjusted steplessly by adjusting the radius of each engagement circle with the input/output disk.

A cylindrical reinforcing portion 11a extends from the large end side of the power roller 1a. This reinforcing portion 11a can effectively prevent the power roller from being deformed into an elliptical shape as described in the conventional example.

The one shown in FIG. 2 has the small end surface side of the power roller 1 extended in the axial direction by h as shown in the figure, and a reinforcing section 11 similar to that shown in FIG. 1 provided on the outer periphery of the large end surface side. In addition to improving the rigidity of the roller itself, a needle roller bearing 5 is attached to the h portion to support the radial load caused by the traction force. Reference numeral 4 is a mounting hole for the above-mentioned needle roller bearing 5, reference numeral 3 is a roller shaft, 2 is an inner ring of the tapered roller bearing, and 61 and 71 are an inlet and a hole, respectively.
Shows output disk.

In the embodiment of FIG. 2 having such a structure, the power roller 1 has one support part in addition to the support bearing part using the conventional thrust bearing, so that the power roller 1 secures the correct center of rotation. Therefore, it is clear that no moment load acts on the thrust bearing, and the load capacity is significantly increased. Furthermore, as described above, the large diameter side of the raceway surface has a cylindrical reinforcing portion 11 extending in the axial direction, and since the thickness of the power roller 1 is increased, the rigidity against the elliptical deformation is further strengthened. This makes it difficult to deform due to the concentrated large load. As a result, problems such as shortened lifespan due to peeling, poor rotation, and seizure, which often occur in the past, are reduced, and vibrations of the power roller 1 caused by traction force during speed change in the toroidal cavity are reduced. Power roller 1 for less wear and tear
The service life of the toroidal transmission will be extended, the problems of the conventional one will be solved, and the performance of the toroidal transmission will be greatly improved.

FIG. 3 shows a third embodiment of this invention, which differs from the second embodiment in that the reinforcing portion 11 provided on the large end surface of the power roller 1 has an annular shape, and The protrusion protrudes from the surface side, and the protrusion is formed to serve as a lubricating oil reservoir to mainly lubricate the large diameter side of the rolling element, and because it always holds lubricating oil, it is more effective than the second embodiment. Accidents such as poor rotation and seizure are less likely to occur, and the rigidity is improved, resulting in a longer life.

Although needle roller bearings are used as rolling bearings in the second and third embodiments, the invention is not limited to this; similar effects can be obtained with other types of rolling bearings, and sliding bearings may also be used. It is also possible. Furthermore, if the inner ring 2 and the roller shaft 3 are formed integrally, the rigidity can be further improved and the cost can also be reduced.

Further, in each of the above embodiments, a tapered roller bearing was used as the thrust bearing, but the present invention can be applied to other types of rolling bearings such as ball bearings, or even to those using fluid bearings. be able to.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part of a toroidal transmission incorporating a power roller according to a first embodiment of the present invention, and FIGS. 2 and 3 are main parts of other embodiments of the power roller according to this invention, respectively. FIG. In the figure, 1 is a power roller, 11 is a reinforcing part, 2
3 is an inner ring of a tapered roller bearing, 3 is a roller shaft, 4 is a mounting hole, and 5 is a needle roller bearing.

Claims (1)

[Claims for Utility Model Registration] (1) A power roller having an inner raceway surface for a thrust bearing is provided in a toroidal cavity formed by an input disk of an input shaft and an output disk of an output shaft that face each other. The power roller is arranged so that it can freely rotate at high speed around the inner ring of the thrust bearing arranged on the roller shaft, and its outer peripheral surface is engaged with the input/output disk, so that the power roller is generated at the engagement portion. 1. A power roller for a toroidal transmission that transmits torque by traction force, characterized in that a reinforcing portion is formed on a large-diameter end surface side of an end surface of the power roller. (2) Utility Model Registration The power roller according to claim 1, wherein the reinforcing portion is formed in a cylindrical shape in the axial direction. (3) In the power roller according to claim 1 of the utility model registration claim, the raceway surface of the power roller is a tapered raceway surface for a tapered roller bearing, and the reinforcing portion is located above the large diameter end of the raceway surface. A power roller for a toroidal transmission is a circular ring that protrudes like an eave and is formed to also serve as an oil reservoir for lubricating the large diameter side of the rolling element. (4) Scope of Utility Model Registration Claims 1, 2, and 3, in which the power roller is further formed with a radial load bearing raceway surface on the same axis as the thrust bearing raceway surface, for use in a toroidal transmission. power roller. (5) A power roller for a toroidal transmission, wherein the radial load bearing is a needle roller bearing in the power roller according to claim 4 of the utility model registration claim. (6) Utility Model Registration A power roller for a toroidal transmission according to any one of claims 1 to 5, wherein the roller shaft of the power roller is integrally formed with the inner ring of a thrust bearing.