JPH09100883A - Continuously variable transmission by differential gear mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent slippage despite of strong force, by providing two paths having different gear ratio only when one side or the other side path is fixed, and distributing input rotation to two paths. SOLUTION: The revolution of the planetary pinion 3 of a first differential gear mechanism 19, as one of a rotation movement transmission paths; is transmitted as the revolution of the planetary pinion 16 of a second differential gear mechanism 20 via a carrier 6, a rotation spindle 7, and a carrier 8. Also, the rotation of the internal gear 4 of the differential gear mechanism 19, as one more rotation movement transmission path, is transmitted to the internal gear 15 of the differential gear mechanism 20 via gears 5 and 9, a rotation spindle 10, bevel gears 11 and 12, a worm 13, and a worm wheel 14. In the gear mechanism 20, rotation, transmitted from the differential gear mechanism 19 is extracted to an output spindle 18 from a sun gear 17 via two paths, in a primarily joined form. Consequently, because of continuously variable transmission, anxiety, slippage in a transmission path, like transmission utilizing friction force, can be eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuously variable transmission device which uses a differential gear mechanism to continuously control the output shaft rotational speed with respect to the input shaft rotational speed.

[0002]

2. Description of the Related Art Conventionally, as a continuously variable transmission, a ring cone system and a belt pulley system are generally mentioned as typical ones, but both of them have a rotational force of a friction medium for transmitting a rotational force between two axes. Continuously shifting is performed by changing the transmission diameter. Therefore, in order to use frictional force to transmit force,
It was not enough to transmit a large force.

[0003]

SUMMARY OF THE INVENTION The present invention has been devised to solve the above-mentioned problems of the prior art. By transmitting a force by a rigid body such as a gear, the force transmission is large regardless of frictional force. An object of the present invention is to provide a continuously variable transmission that does not slip even with force.

[0004]

SUMMARY OF THE INVENTION The present invention comprises two sets of differential gears, where any one shaft of the first differential gear is used as an input shaft and the remaining two shafts are used as power transmission paths. Second
This is a device that is connected to any two shafts of the differential gear set of 1 above and takes out the output from the remaining one shaft of the second differential gear set. The two paths for power transmission between the first and second differential gear units are between the input shaft and the output shaft when only one path is fixed and when the other path is fixed. And has different gear ratios, and is characterized in that the input rotation is distributed and controlled to the paths for transmitting the two powers.

In the above continuously variable transmission, it is preferable to use a worm gear in one of the two power transmission paths between the two sets of differential gear units.

[0006]

In the continuously variable transmission of the present invention, the two power transmission paths between the two sets of differential gears are rotated when the one path is fixed and when the other path is fixed. The ratio of the output shaft rotation number to the number is different, and the power transmission path having the larger reduction ratio acts as the low speed rotation transmission path, and the other acts as the high speed rotation transmission path. Since the two power transmission paths are always connected between the input shaft and the output shaft, both paths can be used simultaneously to transmit the rotational force.

When the load on the output shaft is small, the high-speed rotation transmission path acts as the main power transmission path, and as the output shaft load increases, the transmitted power is distributed to the low-speed rotation transmission path, whereby the output shaft relative to the input shaft rotation speed is output. The rotation speed can be reduced and a large torque can be generated.

[0008]

An embodiment will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram showing a perspective view of a first embodiment of a continuously variable transmission according to the present invention. The first differential gear device 19 comprises a sun gear 2, a planetary pinion 3, and an internal gear 4
Is fixed to the input shaft 1. The planet pinion 3 is rotatably supported by the carrier 6. The carrier 6 and the carrier 8 are fixed to the rotating shaft 7. The carrier 8 rotatably supports the planet pinion 16 of the second differential gear unit 20. The gear 5 is fixed to the internal gear 4. The gear 9 is fixed to the rotating shaft 10 and meshes with the gear 5. The bevel gear 11 is fixed to the rotating shaft 10, and the bevel gear 1
2 is engaged. The bevel gear 12 is fixed to the worm 13. The worm wheel 14 that meshes with the worm 13 is fixed to the internal gear 15 of the second differential gear device 20. The sun gear 17 of the second differential gear device 20 is fixed to the output shaft 18.

When the input shaft 1 is rotated, the first differential gear device 19 moves. First as one of the rotational motion transmission paths
The revolution of the planetary pinion 3 of the differential gear device 19 of the second differential gear device 2 passes through the carrier 6, the rotation shaft 7, and the carrier 8.
It is transmitted as the revolution of the planetary pinion 16 of zero. In addition, the first differential gear device 1 is used as another rotary motion transmission path.
The rotation of the internal gear 4 of the gear 9 passes through the gear 5, the gear 9, the rotary shaft 10, the bevel gear 11, the bevel gear 12, the worm 13, and the worm wheel 14, and the internal gear 15 of the second differential gear device 20.
Is transmitted to In the second differential gear device 20, the rotation transmitted from the first differential gear device 19 via the above two paths is taken out from the sun gear 17 to the output shaft 18 in a form of primary coupling.

The path including the rotating shaft 7 between the two differential gears acts as a high speed rotation transmitting path, and the path including the rotating shaft 10 acts as a low speed rotation transmitting path having a large reduction ratio. The rotation input to the first differential gear device 19 is distributed to the two high-speed rotation transmission paths and the low-speed rotation transmission path, and then combined by the second differential gear device 20 to output the output shaft 18
Can be taken out. Therefore, an arbitrary output shaft rotation speed can be obtained by controlling the distribution ratio of the rotation from the input shaft to the two high speed rotation transmission paths and the low speed rotation transmission path.

Since there is a frictional load due to slip transmission between the worm 13 and the worm wheel 14 provided in the low speed rotation transmission path including the rotation shaft 10, the rotation shaft 10
It becomes a rotation resistance when the low speed rotation transmission path including is rotated.

For the sake of explanation, it is assumed that the friction loss due to the rotation of all the rotary shafts in the apparatus of FIG. 1, the transmission loss of the gears except the worm gear, and the inertia of all the rotating bodies are sufficiently small and can be ignored. Rotating shaft 1 when there is no load
The low-speed rotation transmission path including 0 does not rotate because of the rotation resistance. Therefore, the input rotation is transmitted to the output shaft only by the high-speed rotation transmission path including the rotation shaft 7. When the output shaft load sufficient to rotate the low-speed rotation transmission path including the rotation shaft 10 is applied against the rotation resistance, the input rotation is distributed to the low-speed rotation transmission path including the rotation shaft 10 according to the output shaft load. . That is, the ratio of the output shaft rotation speed to the input shaft rotation speed according to the magnitude of the output shaft load is controlled by the worm.

As another embodiment, FIG. 2 is a schematic configuration diagram showing a perspective view of a second embodiment of the continuously variable transmission according to the present invention, in which the same components as those in the first embodiment are designated by the same reference numerals. The redundant description will be omitted. In the second embodiment of FIG. 2, a braking device 21 is added to the first embodiment of FIG. 1, and when the braking device 21 is activated, the carrier 8 is braked, and as a result, the entire high-speed rotation transmission path including the rotary shaft 7 is applied. Since braking is applied to the output shaft 1, the rotation input to the input shaft 1 uses the low speed rotation transmission path including the rotation shaft 10 as a main power transmission path.
8 can be taken out. That is, when the braking device 21 is operated, the rotation of the high-speed rotation transmission path including the rotation shaft 7 is limited, and it is possible to select to restrict the rotation ratio of the input shaft 1 and the output shaft 18.

As another embodiment, FIG. 3 is a schematic configuration diagram showing a perspective view of a third embodiment of the continuously variable transmission according to the present invention, and the same components as those in the first embodiment are designated by the same reference numerals. The redundant description will be omitted. The third embodiment of FIG. 3 is obtained by adding a gear 22 and a gear 23 to the first embodiment of FIG. The gear 22 is fixed to the carrier 6. Gear 2
The gear 3 can be selectively meshed with the gear 22 by transmitting the rotation to the rotary shaft 10 and sliding the same in the axial direction. When the gear 23 is slid and meshed with the gear 22,
The rotation input from the input shaft 1 is distributed by the differential gear device 19 to the high-speed rotation transmission path including the rotation shaft 7 and the low-speed rotation transmission path including the rotation shaft 10 at a constant ratio regardless of the magnitude of the output shaft load. After that, the output shaft 18 is synthesized by the differential gear device 20.
Rotation. That is, it is possible to limit the rotation ratio of the two power transmission paths between the two sets of differential gear devices to restrict the rotation ratio of the input shaft 1 and the output shaft 18.

In the third embodiment, the rotation ratio of the input shaft 1 and the output shaft 18 is restricted by interlocking the high speed rotation transmission path including the rotation shaft 7 and the low speed rotation transmission path including the rotation shaft 10. Due to the configuration of the invention, the input shaft 1 and the output shaft 1
8, any of the four axes of the arbitrary axis in the high-speed rotation transmission path including the rotation axis 7 and the arbitrary axis in the low-speed rotation transmission path including the rotation axis 10 are interlocked with all other axes. To do.
Therefore, in order to interlock the high-speed rotation transmission path including the rotation shaft 7 and the low-speed rotation transmission path including the rotation shaft 10, it is possible to indirectly interlock with other shafts without directly interlocking as in the third embodiment. Can be realized, and in that case the result is input shaft 1 as well.
And the rotation ratio of the output shaft 18 can be restricted.

In the above three embodiments, the input shaft 1 is the sun gear 2, but another shaft of the differential gear device 19 can be selected. The output shaft 18 is for the sun gear 17, but another shaft of the differential gear unit 20 can be selected. High-speed rotation transmission path including rotating shaft 7 and rotating shaft 10
The same applies to the low-speed rotation transmission path including the above. Of course, one shaft other than the input shaft of the differential gear device 19 and one shaft other than the output shaft of the actuating gear device 20 can be combined. Further, although the parallel shaft gear mechanism is used for the differential gear device in all the embodiments of the present invention, a differential gear device using a cross shaft gear such as a bevel gear used in an automobile or the like can be used.

[0017]

According to the present invention as described above,
Since the continuously variable transmission is performed by the differential gear device, it is possible to transmit high torque without the risk of slipping in the transmission path unlike transmission using frictional force, so that it can be used for automobiles, trains, etc. Further, since the power transmission path is divided into two systems inside the device, a wide range of gear ratio can be obtained. In addition, since it is transmitted by gears, it produces less noise.

[Brief description of the drawings]

FIG. 1 is a perspective view of a first embodiment of the present invention.

FIG. 2 is a perspective view of a second embodiment of the present invention.

FIG. 3 is a perspective view of a third embodiment of the present invention.

[Decoding of sign]

 1 Input Shaft 2, 3, 4, 19 First Differential Gear Device 5, 9 Gear 6, 8 Carrier 7, 10 Rotation Shaft 11, 12 Bevel Gear 13, 14 Worm Gear 15, 16, 17, 20 Second Difference Dynamic gear device 18 Output shaft 21 Braking device 22, 23 Gear

Claims (3)

[Claims] 1. A second differential gear device comprising two sets of differential gear devices, wherein any one shaft of the first differential gear device is used as an input shaft, and the remaining two shafts are used as power transmission paths. Is a device which is connected to any two shafts of the above and takes out the output from the remaining one shaft of the second differential gear device. The two paths for power transmission between the first and second differential gear units are between the input shaft and the output shaft when only one path is fixed and when the other path is fixed. And a variable speed ratio, the input rotation is distributed and controlled to the two paths for power transmission. 2. The continuously variable transmission according to claim 1, wherein a worm gear is provided in one of the two power transmission paths between the two sets of differential gear units. 3. The continuously variable transmission according to claim 1, wherein a braking device is provided in at least one of the two power transmission paths between the two sets of differential gear devices, or both paths are provided with gears or the like. A continuously variable transmission characterized in that it is possible to select to restrict the rotation ratio of the input shaft and the output shaft by providing a mechanism that can be temporarily interlocked with each other.