JPH0650401A - Friction type continuously variable transmission for electric motor truck - Google Patents

Abstract

PURPOSE:To smooth operation of a continuously variable transmission including a variable speed ring which surrounds conical surfaces of a plurality of conical rollers performing planetary movement, frictionally engages with them and is axially movable, by providing a cam mechanism moving the variable speed ring to the low speed side with the increase of load torque. CONSTITUTION:In an electric motor truck, a friction type continuously variable transmission 2 is directly coupled with an output shaft of a DC motor 1 and output rotation of the variable speed change gear 2 is transmitted to driving wheels from an output shaft 4. In the friction variable speed change gear 2, a plurality of conical rollers 7 performing planetary movement are interposed between an input disc 5 rotated by the motor 1 and an output disc 6 connected to the output shaft 4, and a variable speed ring 8 which surrounds the conical surfaces of the rollers 7 and frictionally engages with them is axially moved to perform the speed change. In this case, a cam mechanism 9 for moving the variable speed ring 8 to the low speed side with the increase of load torque is attached. The cam mechanism 9 is constituted so that a cam driven piece 13 supported with a speed change gear casing 11 is brought into slide contact with a cam 12 provided on the variable speed ring 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a friction continuously variable transmission for a truck (electric truck) driven by a DC motor.

[0002]

2. Description of the Related Art Forklifts are often used for in-house transportation work in factories, warehouses, etc.
A hand-held trolley with a small turning radius is used to convey relatively lightweight articles such as 300 kg. However,
With the aging of workers, electric carts using a DC motor as a drive source have recently been used in place of the push cart.

[0003]

The adoption of an electric trolley instead of a hand-held trolley greatly contributes to an improvement in the efficiency of carrying heavy objects. On the other hand, in the electric trolley, at the time of starting, speed switching and stopping. A relatively large impact is generated, and the impact causes the load to collapse or the conveyed article to be damaged.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to easily eliminate the above-mentioned inconvenience of an electric trolley, and an input disk drive-connected to a DC motor and an output circle drive-connected to an output shaft. A plurality of conical rotors that perform planetary motion are interposed between the plate and the plate, and shifting is performed by axially moving a speed change ring that surrounds the conical surfaces of these conical rotors and that frictionally engages. In a type in which the point where the rotational speed of the output shaft is set to 0 is included in the gear shift range, a cam mechanism that exerts a force that moves the gear shift ring toward the low speed side as the load torque increases And a casing of the transmission, and a ring holder that supports the transmission ring by being rotatable about the central axis of the input shaft and the output shaft and capable of moving in the axial direction is provided. hand A member for moving to the high speed side of the conical trochanter, that is, to the side close to the apex of the conical surface of the trochanter is provided so that the speed of the output shaft can be controlled via this member, and also via the ring holder. Output shaft rotation speed to 0
It is characterized in that a member for moving the speed change ring is provided up to the position where the vehicle is braked through the member.

[0005]

1 is a vertical sectional side view showing an example of a friction continuously variable transmission for an electric truck according to the present invention. In this figure, 1 is a DC motor, 2 is a friction continuously variable transmission, and 3 and 4 are friction. An input shaft and an output shaft of the continuously variable transmission 2, 5 are input discs on the input shaft 3, and 6 is an output disc on the output shaft 4. Between the input disk 5 and the output disk 6, a plurality of conical rotors 7 that perform planetary motion.
Is intervened. Reference numeral 8 denotes a speed-change ring that surrounds the conical surfaces of the plurality of conical rotors 7 that make a planetary motion and is frictionally engaged.

Reference numeral 9 denotes a cam mechanism that exerts a force for moving the transmission ring 8 toward the low speed side as the load torque increases.

The cam mechanism 9 is shown in FIG. As shown in this figure, the cam mechanism 9 is rotatable about the central axes of the input shaft 3 and the output shaft 4 and is movable in the axial direction to support the transmission ring 8 and the casing 11 of the transmission 2. It is provided between and. Reference numeral 12 is a cam surface of the cam mechanism 9, and 13 is a roller as a cam follower.

FIG. 3 shows a speed control member 14 and a braking member 1.
5 and 5 are shown. The member 14 is an element that controls the rotation speed by moving the ring holder 10 via the spring 16 toward the side closer to the apex 17 of the conical rotor 7 (high speed side).
(If the member 14 is moved in the opposite direction to the above, the ring holder 10 also follows it and moves toward the deceleration side.) On the other hand, the member 15 is an element for braking the output shaft 4,
This member 15 moves the transmission ring 8 (and thus the ring holder 10) toward a position where the rotational speed of the output shaft 4 becomes zero, so that the gear ratio R = the rotational speed of the input shaft 3 / the rotational speed of the output shaft 4 Increase to give the desired braking. Both the speed control member 14 and the braking member 15 are members operated by the driver.
The operation performed by operating is not accompanied by the strong shock found in the conventional electric cart. (It can be said that the speed control and the braking operation are performed in a substantially shockless manner by gently operating the members 14 and 15.)

FIG. 4 is a speed control member 1 of the type shown in FIG.
4 shows a modification in which members 14a and 15a corresponding to the braking member 15 are bell cranks and they are operated by the grip handle via the wires 18a and 18b.

FIG. 5 is a vertical sectional side view showing another example of the friction continuously variable transmission for an electric bogie according to the present invention. In this drawing, an element 1 corresponding to the speed control member 14 of FIG. 3 is shown.
4A and an element 15B corresponding to the braking member 15 in FIG. 3 are provided on one rod body 19, and the rod body 19 is rotated counterclockwise to rotate the ring holder 10 at high speed through the spring 16. Speed control operation to move in the direction is performed,
By turning the rod 19 clockwise, toward the position where the rotational speed of the output shaft becomes zero (towards the low speed direction)
A braking operation for moving the ring holder 10 is performed.

[0011]

As described above, the present invention provides an electric trolley capable of avoiding a load collapse that often occurs in a conventional electric trolley and performing a precise driving with a small turn. In the electric bogie according to the present invention, this is a friction stepless drive having a characteristic that the point where the rotation speed of the output shaft is set to 0 is included in the speed change range and the magnitude of the torque that can be generated as the rotation speed of the output shaft decreases. By allowing the transmission to start, accelerate, decelerate, and stop the vehicle through the ultra-low speed state in a substantially shockless manner.

[0012]

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing an example of a friction continuously variable transmission for an electric truck according to the present invention.

FIG. 2 is a diagram showing the cam mechanism of FIG. 1 taken out.

FIG. 3 is an explanatory diagram of a speed control member and a braking member shown in FIGS. 1 and 2.

FIG. 4 is a diagram showing a modification of the one shown in FIG.

FIG. 5 is a vertical sectional side view showing another example of the friction continuously variable transmission for an electric bogie according to the present invention.

[Explanation of symbols]

 1 DC motor 2 Friction continuously variable transmission 3 Input shaft 4 Output shaft 5 Input disc 6 Output disc 7 Conical rotor 8 Transmission ring 9 Cam mechanism 10 Ring holder 11 Transmission casing 12 Cam surface 13 As cam follower Roller 14 Speed control member 14a, 14A Member 14 member 15 Braking member 15a, 15B Member 15 member 16 Spring 17 Conical vertices of conical rotor surface 18a, 18b Wire 19 Rod

Claims (2)

[Claims] 1. A plurality of conical rotors that perform planetary motion are interposed between an input disc drivingly connected to a DC motor and an output disc drivingly connected to an output shaft. In the type in which the speed change ring, which surrounds the conical surface of the child and is frictionally engaged, is moved in the axial direction to reduce the rotational speed of the output shaft to 0 in the speed change range, the load torque A cam mechanism that exerts a force to move the speed change ring toward the low speed side with the increase is provided between the speed change ring and the transmission casing, and is rotatable around the center axis of the input shaft and the output shaft. And a member for providing a ring holder capable of axially moving and supporting the speed change ring, and moving the ring holder through a spring to the high speed side of the conical rotor, that is, to the side close to the apex of the conical surface of the rotor. This section The speed of the output shaft is controlled via the material, and a member for moving the speed change ring to the position where the rotational speed of the output shaft is set to 0 via the ring holder is provided. A friction continuously variable transmission for an electric bogie, which is characterized in that the braking is performed. 2. A member for moving the ring holder to the high speed side of the conical trochanter via a spring, and a member for moving the transmission ring to a position where the rotational speed of the output shaft is zero via the ring holder. The friction continuously variable transmission according to claim 1, wherein the friction continuously variable transmission is configured as a common member.