JPS59190557A - Friction ball type stepless transmission - Google Patents

Abstract

PURPOSE:To make mechanism efficiency ever so better, by supporting a friction ball rolling element with a rolling friction mechanism, while pressing the friction rolling element to a friction surface being locked to both input and output shafts under pressure. CONSTITUTION:Each of friction ball rolling elements 8a and 8b is supported by a thrust bearing 5 and a bearing 10 in combination, while these rolling elements 8a and 8b are pressed against each of friction surfaces 16 and 14 being locked to both input and output shafts 1 and 17 by means of a pressure spring 30 and a plate spring 6 under pressure. With this constitution, since these friction ball rolling elements 8a and 8b are eventually pressed coherent to these friction surfaces 14 and 16 through a technique of rolling friction by the bearing 10 and the thrust bearing 5, any loss due to friction is as little as negligible and, what is more, there is no loss by force, thus mechanical efficiency comes yet better as a whole.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mechanical continuously variable transmission, and more particularly to a friction type continuously variable transmission that operates with low vibration and low noise. Friction systems include a planetary wheel friction system that uses planetary wheels, a spherical transmission friction system, etc. The spherical transmission system includes a sloped sphere transmission system, and the present invention is a sloped sphere transmission system. This is a variation of

By changing the rotation axis angle of this friction method, the contact position with the two input and output friction surfaces is changed, and the input and output gear ratio is changed.

The Masukkyu Denden transmission has a simple structure and produces less vibration noise.
Although it has the advantage of being resistant to destruction even under excessive loads, the present invention uses a transmission mechanism (bearing) to press the rotating body against the friction surface fixed to the input and output.
is compressed by the force of a spring, etc., and due to the friction caused by the rolling mechanism (bearing) that contacts the friction ball rolling body, there is little loss of force.
Furthermore, the contact area between the rolling mechanism (bearing) and the friction ball rolling body, and the contact area between the input and output friction surfaces and the friction ball rolling body are approximately on a line passing through the center of the friction ball rolling body, and this Since the line is approximately perpendicular to the input and output friction surfaces, it is effective with little loss of force, and therefore there is no extra load between the friction ball rolling body and its rotating shaft, resulting in less damage due to wear. It has features.

The present invention can provide a spherical friction type continuously variable transmission that is simpler in structure, easier to manufacture, and more reliable than conventional spherical friction type continuously variable transmissions.

The present invention will be explained below with reference to the drawings.

FIG. 1 is an example of a cross-sectional view showing the functions of the present invention, and FIG. 4 is a plan view of the output shaft with the case lid 3 removed. be.

As shown in FIG. 1, the input shaft 1 and the output shaft 17 are coaxially ascending, the input shaft 111 passes through the leaf spring 6 and the thrust bearing 5, and the manual friction cylinder 16 is fixed. An output friction disk 14 is integrally fixed to the output shaft 17, and there is a slat 7 bearing between it and the case lid 3, so that it rotates smoothly.
9d rotates between the rough bearing 5 and the output friction disk 14, which is pressed parallel to the input shaft by the leaf spring 6 and attached to the bearing 10, as shown in FIGS. 9 and 10. The crimp ring 30 or 31 illustrated in
The mechanism is such that the input friction cylinder 16 is pressed against the input friction cylinder 16.

The rotating shafts 9a and 9d of the friction ball rolling bodies 8a and 8d are fixed to rotating shaft holding arms 19a and 119d, as shown in FIG. Gear 20.2 via ratio knob 23 and small gear 22
1, the input and output shafts are structured so that the angle P can be changed in opposite directions.

The transmission mechanism of the present invention will be explained with reference to FIGS. 2 and 3.

The input shaft 1 and the output shaft 17 are aligned on the same axis, and the thrust plate 5 and the output friction plate 14 are parallel to each other.
Since it is a ball, the contact part between the thrust plate 5 and the friction method 8,
A line X connecting the contact portion of the output friction plate X4 and the friction method 8 is parallel to the input axis and the output axis. Therefore, the rotating ball 8 is pressed by the thrust plate 5 with a force parallel to the output friction plate 14 by the force of the spring 60.

The friction method 8 has a structure in which a bearing 10 having a large inner diameter and having the same rotation axis as the input shaft 1 is pressed against a friction cylinder 16 fixed to the input shaft 1 via a compression ring 30 or 31. There is. This pressing direction is configured such that the center of the friction method 8, the friction ball 8, and the pressure ring 30 or 31 are located on a line Y that is approximately perpendicular to the contact point between the friction cylinder 16 and the friction method 8. There is.

The pressure ring 30 or 31 is made of an elastic thin steel plate 31 or metal 30 with a slight slope on the inside of the bearing 10, as illustrated in FIGS. 9 and 10, and is shown by the solid arrow line. When pushed in the direction by the spring 18, a structure is created in which pressure is applied between the slope and the friction cylinder in the direction of the dotted arrow Q or Ql, that is, in the direction of the contact point ν between the friction cylinder 8 and the friction cylinder 16. ing. Therefore, the friction method 80 is pressed against the friction cylinder 16 while rotating about the rotation axis P.

As an alternative to the plate spring 6 and the coiled spring 18, it is also possible to utilize the spring effect of a pressurizing mechanism such as a piston or bellows that uses air or fluid.

The friction ball group rolling body is all rolled by the bearing 10 or the thrust plate 5, and the output friction plate 14 and the input friction cylinder 1.6r are pressed together by rolling friction, so there is little loss due to friction, little loss of force, and the overall efficiency is very high. It becomes a good transmission.

As shown in Figure 2 e, if the angle A of the friction method rotation axis P with respect to the line In this case, the gear ratio relative to the input is large, and the output shaft [7] rotates at high speed. That is, by varying the angle A, the speed can be changed steplessly.

As shown in FIG. 5, the input friction cylinder 16 can be replaced by a ring having a hemispherical cross section. Further, the output friction plate 14 can also be replaced by a circular plate having a hemispherical cross section.

A modification in which the input shaft 1 and the output shaft 17 are perpendicular to each other is also conceivable.

As illustrated in Figures 7 and 8, two small bearings 27 and 28 are used to press the friction method 8 in the directions of lines Z1 and Z2, so that the resultant force is at the Y line -'2. Instead of using a relatively large diameter bearing, it is possible to obtain the same effect using a smaller, cheaper bearing. In this case, a line X connecting the contact point between the friction method and the last plate 5 and the output friction plate 14
Then, by fixing the bearing shaft to the bearing mounting ring 29 so that the shaft center x1 of the small bearing forms an angle, input friction method 8 by pushing the bearing mounting ring 29 in the direction of the dotted arrow.Friction cylinder] It is possible to apply pressure to 6.

One, two, three, four, etc. friction method rotating bodies 1'i may be used, and if there are too many, the structure will become complicated and the friction loss will increase.

As mentioned above, the present invention employs the friction method using the spring force to press the input friction surface and the output friction surface at right angles to each other by rolling the pressure surface, so the loss of force is extremely small and the structure is simple. Therefore, it is possible to obtain a continuously variable transmission with low noise and high reliability, which has fewer failures from low output to relatively high output.

[Brief explanation of the drawing]

Fig. 1 is a sectional view for explaining the functions of the present invention, Figs. 2 and 3 are explanatory views of the gear ratio, Fig. 4 is a plan view with the case lid removed, and Figs. 5 and 6 are FIGS. 7 and 8 show examples of using a small bearing, and FIGS. 9 and 10 show a pressurizing ring. 1 Human powered shaft 2 Transmission case 3 Transmission case lid 5 Thrust bearing 6 Leaf spring 8 Friction method rotating body 9 Friction method rotating shaft 16 Human friction cylinder] 7 Output shaft 20.21.22 Gear 27.28 Small bearing 30.31 Caro Pressure Ring Patent Applicant

Claims (1)

[Claims] (]) 2 fixed to the input shaft and the output shaft and polished, respectively.
In a continuously variable transmission that changes the gear ratio steplessly by varying the angle of the rotation axis of the spherical friction rotor that is in contact with two friction surfaces, the pressure of the spring is controlled through a rolling friction mechanism. Continuously variable transmission characterized in that a spherical friction rotor is pressed against two friction surfaces fixed to an input shaft and an output shaft (2) Continuously variable transmission of the present invention having a plurality of spherical friction rotors