JPH08135748A - Automatic continuously variable transmitter - Google Patents

Abstract

PURPOSE: To eliminate additional sensors and actuators for speed change by detecting the amount of load by a transmission itself and varying transmission gear ratio automatically in a traction drive continuously variable transmission. CONSTITUTION: An automatic continuously variable transmission is provided with many spheres 1 as transmitting rotating bodies arranged on a circle, a retainer for spheres 2, and three races 3, 4, and 5 made in contact with the spheres, and the retainer is connected to two of the three races 3, 4, and 5 through a frictional or resistance means so as to form an assembly element. Also one of the assembly element and other two elements are connected to a fixed shaft 9, one of the other two is connected to the input shaft 9, and the remaining one is connected to an output shaft 10.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a traction drive transmission.

[0002]

2. Description of the Prior Art Rotating bodies are pressed against each other to produce EHL
A so-called traction drive continuously variable transmission that transmits torque by a tangential force in a rolling direction generated at an (elastohydrodynamic lubrication) contact point is a mechanical or electrical sensor that detects a load amount when performing automatic gear shifting, An actuator that moves the contact point between the rotating bodies by the output of the sensor was required.

[0003]

SUMMARY OF THE INVENTION The present invention is a traction drive automatic continuously variable transmission that detects the load amount by the transmission itself and automatically changes the gear ratio as needed, without the need for a separate sensor or actuator. To do.

[0004]

DISCLOSURE OF THE INVENTION The present invention has a large number of balls arranged on a circle, a retainer for the balls, and three bearing rings that contact the balls, and the retainer and the three retainers. Of the four elements of the bearing ring are connected to each other through friction or resistance means to form a set element, and one of the set element and the other two elements is connected to the fixed shaft, and An automatic continuously variable transmission in which one is connected to the input shaft and the other one is connected to the output shaft. In the continuously variable transmission, the virtual rotation axis of the ball moves automatically according to the friction resistance. It is done.

[0005]

By taking the above means, the two elements, which are connected to each other through friction or resistance means and constitute the assembled element, rotate relative to each other according to the load, and the virtual rotation of the sphere which is the transmission rotating body. Since the shaft changes its inclination according to the load, the gear ratio automatically changes. The operating principle of the present invention will be described with reference to FIG. In this example, the retainer and the outer race are combined elements, the retainer being connected directly to the fixed shaft, that is, the outer race by a friction surface to the fixed shaft, that is, the case. The ball (1), which is a transmission rotating body, is held by the cage (2), and at the same time, three bearing rings (3).
Pressed against (4) and (5), each bearing ring is EHL
Are in contact with each other. The bearing ring (5) is fixed to the case (7) via a mechanical friction surface (6) which is a friction or resistance means. The bearing ring (3) is connected to the input shaft (9) and the bearing ring (4) is connected to the output shaft (10). When the input bearing ring (3) rotates, the cage (2) is fixed to the case (7) by the column (8), so that the output bearing ring (4) rotates in the opposite direction to the input bearing ring (3). However, when there is no load and when the load is small, the frictional force of the friction surface (6) is larger than the force acting between the cage (2) and the bearing ring (5), and the bearing ring (5) Does not rotate, the virtual rotation axis (a) of the sphere (1) is formed perpendicularly to the line joining the contact points of the bearing rings (3) and (4) with the sphere (1), and the output bearing ring (4)
Rotates in the opposite direction at the same speed as the input raceway (3). When the load increases, the force acting between the cage (2) and the bearing ring (5) overcomes the frictional resistance of the friction surface (6), and the bearing ring (5) opposes the rotation of the input bearing ring (2). It rotates in the direction, and its rotational force is stable at the point where it balances the frictional resistance of the friction surface (6). Thus, in this case, the virtual rotation axis changes as shown in (b), the output bearing ring (4) rotates slower than the input bearing ring (3) in the opposite direction, and the torque thereof is equal to that of the input bearing ring (3). Greater than torque. When the load is further increased, the inclination of the virtual rotary shaft is further increased, the reduction ratio is further increased, and the torque ratio is also increased. Therefore, the automatic continuously variable transmission according to the present invention automatically adjusts the drive torque and the load torque. The gear ratio correspondingly changes.

[0006]

FIG. 2 is an upper half of a longitudinal section of an essential part of a continuously variable transmission according to an embodiment of the present invention. In this embodiment, a ball retainer (2) is fixed to an output shaft (10) and a track is formed. The wheel (11) is fixed to the case (7). The bearing ring (5) is also connected to the case (7) via a friction band (6), so that in this example the bearing ring (5) and the bearing ring (11) are the assembly elements. The friction band (6) is similar to the brake band often used in automatic transmissions of automobiles, but when the bearing ring (5) rotates, the friction band (5) and the friction band (6) are An oil film is formed between them to prevent wear, as in the case of a sliding bearing. In the case of this embodiment, the friction band (6) and the bearing ring (5) are adjusted by adjusting the tightening of the friction band (6) on the bearing ring (5).
The friction between and can be controlled, and thereby the operating characteristics of the transmission can be significantly changed or controlled.

[0007]

The traction drive continuously variable transmission according to the present invention has a simple structure because the load itself is detected by the transmission and the gear ratio is automatically changed if necessary, and the structure is so-called ball bearing. It is similar to the above, and since it is possible to use the manufacturing technology and equipment for ball bearings, mass production can be facilitated.

[Brief description of drawings]

FIG. 1 is a schematic diagram illustrating the principle of the present invention.

FIG. 2 shows an upper half of a longitudinal cross section of a main part of a continuously variable transmission according to the present invention.

[Explanation of symbols] (1) Sphere which is a transmission rotating body (2) Ball retainer (3) Input bearing ring (4) Output bearing ring (5) Bearing ring (6) Friction surface or friction band (7) Case ( 8) Support post (9) Input shaft (10) Output shaft (11) Bearing ring (12) Disc spring (13) Thrust bearing (a) Virtual rotating shaft (b) Virtual rotating shaft

Claims (1)

[Claims] 1. A multitude of spheres arranged on a circle, a retainer for the sphere, and three bearing rings contacting the sphere, the retainer and the three bearing rings being four elements. Two of them are connected to each other through friction or resistance means to form a set element, one of the set element and the other two elements is connected to a fixed shaft, and one is connected to an input shaft. , An automatic continuously variable transmission in which the other one is connected to the output shaft.