JPH03219157A - Frictional continuously variable transmission - Google Patents

Abstract

PURPOSE:To ease capacity limit by providing on a small diameter transmission gear, a ring body to be engaged with the conical face of a conical rotor in an operating region selected under the condition of the high rotating speed of an input shaft and the low rotating speed of an output shaft and to be disengaged from the conical face of the conical rotor in the remaining operating region. CONSTITUTION:On a small diameter transmission gear 4, there is provided a ring body 14 to be engaged with the conical face of a conical rotor 2 in an operating region selected under the condition that the rotating speed of an input shaft 11 is high and that of an output shaft is low, and to be disengaged from the conical face of the conical rotor 2 in the remaining operating region. With this constitution, after reaching such an operating state that there is fear of cutting off drive connection between the small diameter transmission gear 4 and conical rotor 2, the ring body 14 can prevent the conical rotor 2 from its movement of receding from the center axis of the input shaft 11.

Description

DETAILED DESCRIPTION OF THE INVENTION A.Objective of the invention (industrial application field) The present invention includes a point where the rotational speed of the output shaft is set to 0 in the shifting range, and a point that may occur as the rotational speed of the output shaft decreases. The present invention relates to a continuously variable friction transmission in which the magnitude of torque increases.

(Prior Art) As a friction continuously variable transmission in which the speed change range includes the point at which the rotational speed of the output shaft is set to O, and the amount of torque that can be generated increases as the rotational speed of the output shaft decreases, the applicant's There is one described in Japanese Patent Publication No. 13221/1983 related to the development. This is a conical surface (first
a second transmission surface that frictionally engages a small diameter transmission wheel on the input shaft, and a second transmission surface that frictionally engages a large diameter transmission wheel that is coupled to the output shaft or is kept in a non-rotating state. A type in which multiple conical rotors with a third transmission surface are provided on the transmission system, and are used to connect a clutch or torque converter between the prime mover and the equipment driven by it. The equipment can be started against large load torques without intervening intermediate elements.

6 and 7 show the speed change ring 1, conical rotor 2, first, second . Third
transmission surfaces 2a, 2b, 2c, frictional engagement points 3a, 3b, 3C as points that support the conical rotor 2. FIG.

(Problems to be Solved by the Invention) The three-point support state of the conical rotor 2 in the friction continuously variable transmission of the above type varies greatly depending on the position of the speed change ring 1 shown in FIGS. 6 and 7.

(Fig. 6 shows the three-point support state when the frictional engagement point 3a between the speed change ring 1 and the conical surface 2a of the conical rotor 20 is near the bottom of the conical surface 2a, and Fig. 7 shows the above-mentioned Frictional engagement point 3
A three-point support state is shown when a is near the apex of the conical surface 2a. ) The second transmission surface 2b of the conical rotor 2 is a concave surface, thereby reducing the friction between the conical rotor 2 and the small diameter transmission wheel 4 due to the centrifugal force acting on the conical rotor 2. The engaged state is not released. Second transmission surface 2b
It is for the reason mentioned above that it is considered to be a concave surface.
In order to increase the capacity of the friction continuously variable transmission by increasing the rotational speed of the input shaft or by enlarging the shape of the conical rotor, it is possible to make the second transmission surface 2b of the conical rotor 2 concave. The reliability of the above-mentioned effects is greatly reduced. This is to prevent separation from the frictional engagement state when the speed change ring l is in the low speed position shown in Figure 6 and the input shaft rotational speed is high.
This is because the concave surface portion that contributes to preventing the appearance of a disengaged state becomes extremely small as indicated by the symbol "h" in the figure. The present invention eliminates the need to rely on making the second transmission surface 2b a concave surface in order to prevent separation from the frictionally engaged state between the conical rotor 2 and the small-diameter transmission wheel 4, as in the case of conventional systems. The problem to be solved is to

1. Structure of the Invention (Means for Solving the Problems) The present invention provides a conical surface (first transmission surface) that is inscribed in and frictionally engaged with a speed change ring that is moved in the axial direction by a speed change operation device, and an input shaft. a second transmission surface that frictionally engages with the upper small diameter transmission wheel; and a third transmission surface that frictionally engages with the large diameter transmission wheel that is interlocked with the output shaft or is kept in a non-rotating state. In a type of transmission system in which multiple conical rotors are installed in the transmission system, the conical rotors are A ring body is provided on the small diameter transmission wheel, which engages with the conical surface of the conical trochanter and does not engage with the conical surface of the conical trochanter in the remaining operating region.

The friction continuously variable transmission according to the present invention is a "ring non-rotating type" in which the transmission ring is kept in a non-rotating state when the large-diameter transmission wheel is interlocked with the output shaft. When kept in a non-rotating state, it becomes a "ring rotation type" in which the rotation of the speed change ring is transmitted to the output shaft.

(Function) The ring body is an element that prevents the occurrence of Prevent movement of the conical trochanter away from the axis. The state shown in Figure 6 can be determined by adding the condition that the rotational speed of the input shaft is high and the rotational speed of the output shaft is low. This can be said to be an "operating condition in which there is a risk that the drive connection between the small diameter transmission wheel on the input shaft and the conical rotor may be severed." This state can also be said to be a state in which h in FIG. 6 is small, the input shaft rotational speed is high, and the output shaft rotational speed is low.

(Example) Fig. 1 is a longitudinal side view showing an example of a friction continuously variable transmission according to the present invention, and Fig. 2 is a method of connecting a ring body and a small diameter transmission wheel provided in the friction continuously variable transmission according to the present invention. 3 and 4 are longitudinal sectional side views illustrating the relationship between the speed change ring and the ring body, and FIG. 6 and 7 are vertical side views showing the main parts of the conventional friction continuously variable transmission, which is the background of the present invention, with the speed change ring position changed. The symbols given to each part shown in the figures and FIG. 7 are used as they are.

In FIG. 1, 11 is an input shaft, 12 is an output shaft, 13 is a speed change operation device, and 4 is an annular body provided according to the present invention. In the one shown in FIG. 1, the ring body 14 is provided integrally with the small diameter transmission wheel 4, but in order to facilitate manufacturing and installation, the ring body 14 is attached to the small diameter transmission wheel 4 via a clip 15 as shown in FIG. It is preferable to use an element that is attached to the small-diameter transmission wheel 4 through a rolling bearing 16 as shown in FIG.

The ring body 14 engages with the conical surface 2a (first transmission surface) of the conical rotor 2 in an operating region selected under the condition that the rotation speed of the input shaft is high and the rotation speed of the output shaft is low. In the remaining operating range, the conical surface 2a of the conical trochanter 2 (
(first transmission surface) is in a disengaged state. The operating area where the ring body 14 is engaged with the conical surface 2a (first transmission surface) of the conical rotor 2 is referred to as the "action area of the ring body 14", and the ring body 14 is referred to as the conical surface 2a of the conical rotor 2. If the operating region in which it is not engaged with the (first transmission surface) is referred to as the "non-working region J of the ring body 14," these regions correspond to the input shaft of the friction continuously variable transmission. It is determined by taking into account the rotational speed and the size of the conical trochanter 2.

The reason why the second transmission surface 2b of the conical rotor 2 has a concave cross-sectional shape and the reason why the ring body 14 is provided are both to prevent the conical rotor 2 from coming off the small diameter transmission wheel 4. Considering that the second power transmission surface 2b of the conical trochanter 2 is not necessarily required to have a concave cross-sectional shape when the ring body 14 is provided. I understand. Therefore, if it is clear that the friction continuously variable transmission is for a case that requires the installation of the ring body 14,
It is desirable to provide the annular body 14 on the one hand and to make the second transmission surface 2b of the conical rotor 2 a cylindrical surface on the other hand to streamline the production of the conical rotor 2.

C6 Effects of the Invention A conical surface (first transmission surface) that is inscribed and frictionally engaged with the speed change ring that is moved in the axial direction by the speed change operating device, and a second surface that is frictionally engaged with the small diameter transmission wheel on the input shaft. A friction continuously variable transmission of the type in which the transmission system is provided with a plurality of conical rotors each having a transmission surface and a third transmission surface that frictionally engages with a large-diameter transmission wheel interlocked with an output shaft is a friction continuously variable transmission. Due to the centrifugal force acting on the trochanter, the capacity has been limited, but the present invention significantly alleviates this limitation.

Further, the present invention can have the effect of simplifying the shape of the conical trochanter of the above type and facilitating the work of the conical trochanter.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional side view showing one example of a friction continuously variable transmission according to the present invention, and FIG. 2 is a longitudinal cross-sectional view illustrating a method of connecting a ring body and a small diameter transmission wheel provided in the friction continuously variable transmission according to the present invention. A side view, FIGS. 3 and 4 are longitudinal sectional side views for explaining the relationship between the speed change ring and the ring body, FIG. FIG. 7 is a longitudinal sectional side view showing the main parts of the conventional friction continuously variable transmission, which is the background of the present invention, with the position of the speed change ring changed. Figure 1

Claims (1)

[Scope of Claims] 1. A conical surface (first transmission surface) that is inscribed and frictionally engaged with a speed change ring that is moved in the axial direction by a speed change operation device;
a second transmission surface that frictionally engages a small diameter transmission wheel on the input shaft;
A type of transmission system in which a plurality of conical rotors are provided in the transmission system and have a third transmission surface that frictionally engages a large-diameter transmission wheel that is coupled to the output shaft or is kept in a non-rotating state. In a motor, the rotational speed of the input shaft is high and the rotational speed of the output shaft is low, the rotational speed of the conical trochanter is engaged with the conical surface of the conical trochanter in a selected operating region, and the conical trochanter is engaged with the conical surface of the conical trochanter in the remaining operating region. A continuously variable friction transmission characterized in that an annular body that does not engage with a conical surface is provided on the small diameter transmission wheel. 2. The friction continuously variable transmission according to claim 1, wherein the second transmission surface on the conical rotor that frictionally engages with the small diameter transmission wheel on the input shaft is a cylindrical surface.