JPH0592563U - Transmission of differential planetary type continuously variable transmission - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce the operating load of the transmission of a continuously variable transmission with a differential planetary mechanism. [Structure] The transmission ring 12 is fitted onto the peripheral surface of the umbrella-shaped cone 10 arranged as a planet, and the input shaft 1 is inserted from the front and rear of the neck.
4, the input disc 16 linked to the output shaft 18 and the output disc 20 linked to the output shaft 18 are brought into pressure contact with each other, and the transmission ring 12 is moved on the peripheral surface of the umbrella-shaped cone 10 to move the output shaft 18 relative to the input shaft 14. In a continuously variable transmission with a differential planetary mechanism that changes the number of revolutions, in addition to fixing the transmission ring 12, the input shaft 14 and the input disc 16 and the output shaft 18 and the output disc 20 are respectively formed by ball spline mechanisms 32 and 34. The input disk 16, the umbrella-shaped cone 10 and the output disk 20 are linked so as to be movable in the axial direction.
A transmission device for a continuously variable transmission of a differential planetary mechanism type, characterized in that the entire transmission unit 36 consisting of is moved.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a transmission of a continuously variable transmission of a differential planetary mechanism type.

[0002]

[Prior Art]

 A differential planetary mechanism-type continuously variable transmission that uses an umbrella-shaped cone arranged around the circumference of a circle as a transmission element is known. FIG. 5 is a vertical sectional view of a differential planetary mechanism type continuously variable transmission having a conventional structure. The transmission ring 12 is fitted on the peripheral surface of the umbrella-shaped cone 10 arranged in a planetary manner, and the input shaft is inserted from the front and rear of the neck. 14 and the output disc 20 linked to the output shaft 18 are pressed against each other, and the transmission ring 12 is moved on the peripheral surface of the umbrella-shaped cone 10. This is a structure for changing the rotation speed of.

[0003]

[Problems to be solved by the device]

 Since the continuously variable transmission with this structure is compact and has a large gear ratio and is capable of zero output in particular, it is often used in transmissions of traveling work machines, etc., but it is difficult to operate with heavy load. is there. That is, the umbrella-shaped cone 10 tries to expand outward due to the pressure contact force of the output disc 20 and the like, and the frictional force with the transmission ring 12 that receives the force is strong. In particular, during the stop, this frictional force becomes static frictional force, which requires a very large force to move. In addition, since the transmission ring 12 has a small contact width with the umbrella-shaped cone 10 for its diameter, it is inevitable that the transmission ring 12 will be damaged when moved.

Further, there are structural causes described below. That is, FIG. 6 is a lateral cross-sectional view of a differential planetary mechanism type continuously variable transmission having a conventional structure. A gearshift arm receiver 24 that slides on the support shaft 22 is attached to the gearshift ring 12, and the gearshift arm receiver 24 is attached. In this case, the shoe 28 of the speed change arm 26 is largely separated from the axis of the speed change ring 12, and this eccentric distance causes a pry to cause a change in the operating load. It was causing an increase. The present invention solves such a problem, and in short, is a continuously variable transmission having such a structure that can be operated by a light force.

[0005]

[Means for Solving the Problems]

 Under the above problems, according to the present invention, a transmission ring is fitted on the peripheral surface of an umbrella-shaped cone arranged in a planetary manner, and an input disc connected to the input shaft from the front and rear of the neck and an output circle connected to the output shaft. In a differential planetary mechanism type continuously variable transmission that changes the rotation speed of the output shaft with respect to the input shaft by pressing the plate against the plate and moving the transmission ring on the peripheral surface of the umbrella-shaped cone. , The input shaft and the input disc, and the output shaft and the output disc are linked by a ball spline mechanism so as to be movable in the axial direction, and the entire transmission unit consisting of the input disc, the umbrella cone and the output disc is moved. (EN) Provided is a transmission device for a continuously variable transmission of a differential planetary mechanism type, which is characterized in that gear shifting is performed.

Further, according to the present invention, in the above-mentioned structure, the fork having the two shoes is linked to the output disc, and the transmission unit is moved by the rotation of the fork, and the line connecting the two shoes is formed. (EN) Provided is a transmission device for a differential planetary mechanism-type continuously variable transmission, which is characterized in that the output shaft is passed through substantially the center of the shaft.

[0007]

[Action]

 By adopting the first means, that is, moving the variable speed unit having a smaller diameter than moving the speed change ring causes less prying, and the ball spline mechanism changes the sliding resistance into the rolling resistance to reduce the movement resistance. Decrease.

Further, by adopting the second means, when the fork is rotated, the shoe acts on the shaft center of the speed change unit, so that the speed change unit does not get twisted, and the operating load is reduced also in this respect. To do.

[0009]

【Example】

 1 and 2 are vertical cross-sectional views of a differential planetary mechanism type continuously variable transmission showing an embodiment of the present invention, the main structure of which is the same as that described above. The difference is that the speed change ring 12 is fixed to the case 30 and the like and is position-invariant, and that the input shaft 14 and the input disc 16 and the output shaft 18 and the output disc 20 are connected to the ball spline mechanism 32, respectively. 34 is movably linked in the axial direction, and the entire transmission unit 36 including the input disc 16, the umbrella cone 10 and the output disc 20 can be moved. The speed change unit 36 has an intermediate shaft 38 at the center, which moves integrally with the speed change unit 36.

FIG. 3 is a cross-sectional view of one ball spline mechanism 34. The ball spline mechanism 34 has an inner circumference of the output shaft 18 and an outer circumference of the output disc 20 (strictly speaking, with respect to the output disc 20). The drive wheel 56) coupled via the balls 54 is formed with grooves 40 and 42 in the axial direction at about three places on the circumference, and the balls 44 are inserted into the grooves 40 and 42 (the other one). The same applies to the ball spline mechanism 32). Thus, for example, if the output disc 20 or the like is moved, the transmission unit 36 moves with respect to the transmission ring 12 without obstructing power transmission. If the speed change ring 12 is at the skirt of the peripheral surface of the umbrella-shaped cone 10 (Fig. 1), the output speed is lower than the input speed, and at the top (Fig. 2), the output speed is high.

The transmission unit 36 is moved by forming a groove 46 on the outer circumference of the output disc 20, linking a fork 48 with the groove 46, and rotating the fork 48 to move the fork 48. FIG. 4 is a cross-sectional view showing the fork 48. The fork 48 is composed of a fork shaft 50 and two shoes 52 fitted in the groove 46. In this case, the line connecting the two shoes 52 is the output. The shaft 18 is set so as to pass substantially through its axis. As a result, the rotational force of the shoe 52 does not cause the output disc 20, that is, the gear shift unit 36 to be twisted, so that the gear shift unit 36 moves with a light force.

[0012]

[Effect of the device]

 As described above, according to the present invention, since the gearshift ring is fixed and the gearshift unit having a small diameter is moved, the gearshift is small and the gearshift unit can be moved with a light force. Also, since the transmission unit is designed to move axially by a ball spline mechanism with respect to the fixed input shaft and output shaft, its resistance becomes rolling resistance and moves with a light force (especially during operation). Furthermore, if the shoe of the fork that moves the speed change unit is made to pass through almost the axis of the speed change unit, the generation of moments that cause prying is reduced, and the force required to move (especially when stopped) is further reduced. It

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a differential planetary mechanism type continuously variable transmission showing an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view of a differential planetary mechanism type continuously variable transmission showing an embodiment of the present invention.

FIG. 3 is a cross-sectional view of a ball spline mechanism showing an embodiment of the present invention.

FIG. 4 is a cross-sectional view of a fork showing an embodiment of the present invention.

FIG. 5 is a vertical sectional view of a differential planetary mechanism type continuously variable transmission showing a conventional example.

FIG. 6 is a cross-sectional view of a differential planetary mechanism type continuously variable transmission showing a conventional example.

[Explanation of symbols]

 10 Umbrella Cone 12 Transmission Ring 14 Input Shaft 16 Input Disc 18 Output Shaft 20 Output Disc 32 Ball Spline Mechanism 34 Ball Spline Mechanism 36 Transmission Unit 48 Fork 52 Shoe

Claims (2)

[Scope of utility model registration request] 1. A transmission ring is fitted onto the peripheral surface of an umbrella-shaped cone arranged in a planetary manner, and an input disc linked to the input shaft and an output disc linked to the output shaft are pressed against each other from the front and rear of the neck. , In a differential planetary mechanism type continuously variable transmission that changes the rotation speed of the output shaft relative to the input shaft by moving the transmission ring on the peripheral surface of the umbrella cone, in addition to fixing the transmission ring, the input shaft and the input disc And the output shaft and the output disc are linked by a ball spline mechanism so as to be movable in the axial direction, and the entire transmission unit including the input disc, the umbrella-shaped cone, and the output disc is moved to shift gears. A transmission of a continuously variable transmission with a differential planetary mechanism. 2. A fork having two shoes is linked to an output disc, and the transmission unit is moved by the rotation of the fork, and the line connecting the two shoes passes through substantially the center of the output shaft. The transmission device for a differential planetary mechanism-type continuously variable transmission according to claim 1, wherein: