JP2021032401A - Continuously variable transmission - Google Patents

Abstract

To provide a continuously variable transmission capable of steplessly changing rotational force from input by adding a simple rotary mechanism such as a motor, and capable of completing continuous speed variation up to a stop state and reverse rotation with a single device.SOLUTION: A continuously variable transmission comprises: a plurality of input discs 2; and a plurality of output discs 3 that are brought into point contact with the input discs 2 or engaged therewith in a minute area, and transmits rotational force. The output disc 3 is operated with a screw gear 8, and the position of the contact or the minute area is changed, so that output rotation can be changed steplessly from forward rotation to reverse rotation through a stop state, with respect to input rotation.SELECTED DRAWING: Figure 1

Description

The present invention relates to a continuously variable transmission capable of steplessly shifting the output rotation from a forward rotation to a reverse rotation through a stopped state by operating a contact.

Conventionally, continuously variable transmissions used in vehicles and the like are well known as a combination of a belt and two variable diameter pulleys, but a clutch mechanism reverses the output rotation to disconnect the input rotation. In that case, a separate reversing mechanism using gears is required. And those using a hydraulic unit to operate these series of mechanisms are widely known.

JP 2012-163140

However, in a continuously variable transmission as in Patent Document 1, in order to shift the input rotation steplessly from the forward rotation to the reverse rotation to the reverse rotation, a transmission mechanism, a clutch (torque converter), a reverse rotation mechanism, and All of the oil pressure generating mechanisms that operate them are required, and there are problems such as the overall size of the device becoming large. In addition, there is a problem that a power transmission loss occurs in the flood control generation mechanism that shares the rotational force leading to the shift.

The present invention has been made in view of such circumstances, and enables stepless speed change of the rotational force from the input, and completes stepless speed change up to a stopped state and reverse rotation with one device. It is possible to perform a series of shifting operations by adding an easy rotation mechanism such as a motor.

The action of the first problem-solving means of the present invention is as follows. The basic configuration consists of two disks, which are theoretically in contact with each other by point contact. Here, when the relative angle of the rotation center of the output side disk is perpendicular to the rotation center of the input side disk and the contact points of the two disks are located at the rotation center of the input side disk, the input side disk The rotational force transmitted to is not transmitted to the disk on the output side, and the output rotation can be stopped.

Similarly, the relative angle of the rotation center of the output side disk is perpendicular to the rotation center of the input side disk, and the output side disk is in the vertical direction of the rotation center axis of the output side disk. When the contact point of the two disks is separated from the rotation center of the disk on the input side, the rotation direction of the disk on the output side can be changed with the rotation center of the disk on the input side as a boundary.

In the movement of the contact points of the series of two disks described above, it is possible to move to an arbitrary position by applying a rotational force by a motor or the like via a gear or the like.

It is also possible to increase the number of contact points by providing a plurality of combinations of the input side disk and the output side disk via gears or the like.

According to the present invention, the rotational force from the input is theoretically transmitted to the output by point contact, but it is difficult to take charge of the torque from the input by point contact, and the disk on the input side and the disk on the output side. A method of forming a minute area can be considered by deforming either or both of them by a pressing force.

However, when the minute area is formed, there is a concern about power loss due to the generation of sliding resistance when trying to create the stopped state.

From the above circumstances, the action of the second problem-solving means of the present invention is as follows. The above problem can be solved by providing a shaft that does not involve rotation at the center of rotation, which is the contact point in the stopped state, and forming a minute area on the same plane as the surface where the two disks are in contact with each other.

As described above, the continuously variable transmission according to the present invention does not require a transmission mechanism, a clutch (torque converter), a reverse rotation mechanism, and a hydraulic generation mechanism for operating them, and can change the rotational force from the input steplessly. In addition, the entire device can be miniaturized by completing the continuously variable transmission up to the stopped state and the reverse rotation with one mechanism.

It is sectional drawing which shows the whole image of the stepless automatic transmission which concerns on 1st Embodiment of this invention. It is an enlarged cross-sectional view which shows half from the input rotation center axis of the stepless automatic transmission shown in FIG. The output disk is located at the center of rotation of the input disk and indicates a state in which the output rotation is stopped without transmitting the input rotation. FIG. 2A shows a state in which the output disk moves inward from the rotation center of the input disk and transmits the output rotation in the same direction as the input rotation direction. FIG. 2A shows a state in which the output disk moves outward from the rotation center of the input disk and transmits the output rotation in the direction opposite to the rotation direction of the input. It is a figure which provided three sets of the combination of the input disk and the output disk in the stepless automatic transmission which concerns on 1st Embodiment of this invention, and is the figure which saw from the output shaft side, and is the input disk in the state of FIG. 2A. It is explanatory drawing which shows the positional relationship of an output disk. It is a figure which provided 3 sets of the combination of the input disk and the output disk in the stepless automatic transmission which concerns on 1st Embodiment of this invention, and is the figure which saw from the output shaft side, and is the input disk in the state of FIG. 2B. It is explanatory drawing which shows the positional relationship of an output disk. It is a figure which looked at the form which provided 3 sets of the combination of the input disk and the output disk in the stepless automatic transmission which concerns on 1st Embodiment of this invention from the output shaft side, and is the figure which saw the input disk in the state of FIG. 2C. It is explanatory drawing which shows the positional relationship of an output disk. It is an enlarged sectional view of the input disk and the output disk which concerns on 2nd Embodiment of this invention.

First, of course, the same reference numerals on different drawings identify structural elements that are identical or functionally similar. Further, the present invention is not limited to the specific embodiments, procedures, materials and modifications described herein, and of course modifications may be made to itself. Further, the terms used in the present specification are merely intended to explain a specific aspect, and are not intended to limit the scope of the present invention. The scope of the present invention is specified only by the appended claims.

Unless otherwise specified, all technical and scientific terms used herein have the same meaning as those normally understood by those with ordinary knowledge in the technical field to which the present invention belongs. All of the methods, devices or materials similar or equivalent to those described herein can be used in the practice or testing of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

In the first problem-solving means of the present invention shown in FIG. 1, the input shaft 1, the gear portion 1a fixed to the input shaft 1, and the gear portion 1a are meshed with each other and offset to the outer diameter side from the central axis. A plurality of rotating shafts X, a plurality of input disc gear portions 2a that can rotate around the rotating shaft X, and a plurality of input discs 2 that are fixed to the plurality of input disc gear portions 2a and perform integral rotation. , A plurality of rotation axes Y arranged in the radial direction from the central axis, and the plurality of rotation axes Y can be rotated about the center, and can be moved in the vertical direction of the rotation axis Y, and make point contact with each input disk 2. A plurality of output discs 3 for performing the above, a plurality of shafts 4 spline-fitted to the output discs 3 and integrally rotating with the plurality of output discs 3, and the inner diameter side ends of the plurality of shafts 4. An output shaft 6 having a plurality of gears 5 arranged and integrally rotating with the plurality of shafts 4, an output shaft gear portion 6a meshed with the plurality of gears 5 and arranged coaxially with the input shaft, and the plurality of output circles. A plurality of holding members 7 that hold the vertical movement of the rotation axis Y with respect to the plate 3, a plurality of rotation axes Z that are arranged in the radial direction from the central axis and parallel to the rotation axis Y, and the plurality of rotations. A plurality of screw gears 8 that are rotatable about a shaft Z and meshed with the plurality of holding members 7, are arranged at the inner diameter side ends of the screw gears 8 and rotate integrally with the screw gears 8. 9 and a speed change gear 10 that is meshed with the plurality of gears 9 and arranged coaxially with the input shaft.

When the input shaft 1 is rotating constantly in a certain rotation direction, the rotational force is transmitted from the gear portion 1a to the plurality of gear portions 2a, and the rotary shaft X is used as an axis for the plurality of gear portions 2a. Each of the input disks 2 enables the same rotation.

The plurality of output disks 3 are in point contact with the plurality of input disks 2, respectively.

2A and 3A show a state in which the contact point of the output disk is located on the rotation axis X of the input disk. When the two disks make point contact at this position, the rotational force from each input disk 2 is not transmitted, and the plurality of gears 5 that rotate integrally with the output disk 3 and the plurality of gears 5 are meshed with each other. The output shaft gear portion 6a and the output shaft 6 are stopped.

2B and 3B show a state in which the contact point of the output disk is moving inward in the radial direction from the rotation axis X. As the contact point becomes inward, the rotation of the plurality of output disks 3 is accelerated in the same rotation direction as the input rotation, and the plurality of gears 5 that integrally rotate with the plurality of output disks 3 and a plurality of gears 5. The rotation transmitted to the output shaft gear portion 6a and the output shaft 6 meshed with the gear 5 can be accelerated in the same rotation direction as the input rotation.

2B and 3B show a state in which the contact point of the output disk is moving outward in the radial direction from the rotation axis X. As the contact point becomes outward, the rotation of the plurality of output disks 3 is accelerated in the direction opposite to the input rotation, and a plurality of gears 5 that integrally rotate with the plurality of output disks 3 and a plurality of gears 5. The rotation transmitted to the output shaft gear portion 6a and the output shaft 6 meshed with the gear 5 of the above can be increased in the direction opposite to the input rotation.

When a rotational force is applied to the gear 10, the rotational force is transmitted to the plurality of gears 9, and each of them integrally rotates with respect to the shaft Z together with the plurality of screw gears 8 fixed to the plurality of gears 9. At this time, by engaging the plurality of screw gears 8 and the plurality of holding members 7, the plurality of holding members 7 can move in the vertical direction on the rotation axis Y, and the plurality of outputs held by the plurality of holding members 7 can be moved. The disk 3 is movable in the vertical direction on the rotation axis Y via a plurality of gears 9, a plurality of screw gears 8 and a holding member 7 that are meshed with the rotational force of the transmission gear 10. As a result, the contact point between the output disk 3 and the input disk 2 becomes movable in the radial direction, and the characteristics of output rotation can be changed as described above.

In the embodiment shown in FIGS. 3A, 3B, and 3C, three combinations of input disks and output disks as described above are arranged.

In the second problem-solving means of the present invention shown in FIG. 4, a plurality of shaft portions 11a fixed to the case 11 vertically on the rotation shafts X of the plurality of input disks 2 and not accompanied by rotation, and the plurality of shaft portions 11a. Has a minute area 11b capable of contacting each output disk 3 at the tip end portion on the output shaft side of the above.

As described above, the output disk 3 can be in contact with the minute area 11b, and when the output disk 3 is located at the center of rotation of the input disk 2, the rotational force from the input is transmitted to the engaging output disk 3. However, the output rotation can be stopped, and the generation of sliding resistance can be eliminated even in the state where the output rotation is stopped.

As described above, according to the continuously variable automatic transmission according to this specific example, the continuously variable transmission from the input can be changed steplessly, and the continuously variable transmission up to the stopped state and the reverse rotation can be performed. It can be completed with a device.

1 Input shaft 1a Input shaft Gear part 2 Input disk 2a Input disk Gear part 3 Output disk b
6 Output shaft 6a Output shaft Gear part 7 Holding member 8 Screw gear 11 Case

Claims (4)

It is provided with a disk on the input side and a disk on the output side that is engaged with the disk on the input side by point contact or engaged in a small area to transmit a rotational force. The rotation axes of the above intersect each other, their relative angles are 0 ° <X <180 °, and either the input-side disk or the output-side disk is operated to operate the contact or the contact point. A stepless automatic transmission characterized in that, by changing the position of the minute area, the output rotation is steplessly changed from the forward rotation to the reverse rotation with respect to the rotation of the input. The stepless automatic transmission according to claim 1, wherein a plurality of combinations of the input side disk and the output disk are provided. The first or second aspect of the present invention, wherein the contact or a minute area can be moved by applying a rotational force coaxial with the input rotating shaft via a plurality of gears including a worm gear. Stepless automatic transmission. A non-rotating shaft fitted to the input-side disk is provided, and by operating either the input-side disk or the output-side disk, the shaft and the output disk come into contact with each other. The stepless automatic transmission according to claim 1 or 2.