JP2011052712A - Toroidal type continuously variable transmission - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a toroidal type continuously variable transmission capable of maintaining a pressing force of power rollers and disks properly at least at the time of operation while suppressing the increase in the number of parts and the requirement of complex calculation. <P>SOLUTION: The toroidal type continuously variable transmission, including: an outside disk; an inside disk arranged coaxially with the outside disk; a plurality of trunnions which rock around a pivot at a position of twist to both center axes of the outside disk and inside disk; a plurality of power rollers, which are supported on the trunnions and pinched so as to be freely rotated and tilted between the outside disk and the inside disk; and a pressing device, which presses the outside disk and the inside disk in the axial direction, measures inclined rolling angles of the power rollers by a potentiometer and carries out the judgment of excessive slip of the power rollers by the differences of the inclined rolling angles of each power roller. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a toroidal-type continuously variable transmission, and more particularly to improved control of the pressing device.

  Conventionally, in toroidal-type continuously variable transmissions, the pressing force between the power roller and the disk during operation is reduced due to the effects of processing errors and assembly errors, and if slip occurs, there is a difference in the tilt angle of the power roller. There was a problem that would occur.

  As a prior art for improving this part, there is a toroidal type continuously variable transmission described in Patent Document 1, which is because the inclination angle of any support member of the toroidal type continuously variable transmission is another support member. In the case where the inclination angle differs from the threshold value, it has a function to determine that excessive slip has occurred at the contact portion between the peripheral surface of any power roller and the disk holding the power roller. When it is determined that excessive slip has occurred, the pressing force generated by the pressing device is increased.

  As another prior art, there is a continuously variable transmission described in Patent Document 2. This is because a value based on a deviation between a set gear ratio and a calculated gear ratio is larger than a slip detection threshold by a slip detection means. When the gross slip is detected, the slip detection threshold value setting means sets the slip detection threshold value based on the rotation state of the input disk, the output disk, or the power roller. The integrated value of the deviation from the ratio is calculated, and when the integrated value is larger than the slip detection threshold by the slip detecting means, the gross slip is detected, and based on the deviation between the set speed ratio and the calculated speed ratio by the integrated amount setting means The integrated amount of deviation is set.

  However, the configuration of Patent Document 1 causes an increase in the number of parts, and the configuration of Patent Document 2 has room for improvement in that it requires complicated calculations. Also, a better one is required from the viewpoint of control certainty.

JP 2007-298098 A JP 2009-057988 A

  It is an object of the present invention to provide a toroidal continuously variable transmission that can keep at least the power roller and disc pressing force during operation while suppressing an increase in the number of parts and the need for complicated calculations. To do.

  In order to solve the above problems, a toroidal continuously variable transmission according to the present invention includes an outer disk, an inner disk coaxially arranged with the outer disk, and a twisted position with respect to both central axes of the outer disk and the inner disk. A plurality of trunnions that swing about a pivot, and a plurality of power rollers that are supported by the trunnions and are tiltably sandwiched between the outer disk and the inner disk, and the outer disk or the inner disk A toroidal-type continuously variable transmission equipped with a pressing device that presses the shaft in the axial direction, measuring the tilt angle of the power roller with a potentiometer, and determining the excessive slip of the power roller The pressure of the pressing device is increased when it is determined that the sliding is excessive.

  According to the present invention, the increase in the number of parts is suppressed, the cost is reduced, and the control reliability is improved because the control is based on contact type measurement with high reliability. In addition, there is an effect that a quick response can be controlled without requiring a complicated calculation.

It is a schematic diagram of a toroidal type continuously variable transmission for explaining the present invention. It is a schematic diagram explaining the rocking | displacement displacement of the toroidal type continuously variable transmission which concerns on the Example of this invention. It is a schematic diagram explaining the excessive slip of the toroidal type continuously variable transmission which concerns on the Example of this invention. It is a figure which shows the AA cross section in FIG.

The embodiment of the present invention will be described with reference to FIGS.
In the case of this example, a potentiometer 10 is provided between the pivot 9 provided at the end of each trunnion 8 and the non-rotating portion that supports each pivot 9, and the power rollers 1, 2, 3 are provided. 4 tilt angles are measured.

  As shown in FIG. 4, the swing portion 11 of the potentiometer 10 is engaged with the pivot 9, and the fixed portion 12 of the potentiometer 10 is engaged with the non-rotating portion that supports the pivot 9.

  When the power rollers 1, 2, 3, 4 are oscillated and displaced from the state of FIG. 1 as in the state of FIG. 2, the processing of the power rollers 1, 2, 3, 4, the outer disk 5 and the inner disk 6 Due to errors and assembly errors, the pressing force of the power rollers 1, 2, 3, 4 and the outer disk 5 and the inner disk 6 during operation becomes small, causing slip, and as shown in FIG. The tilt angle φ2 ′ of the roller 2 becomes larger than the tilt angles φ1, φ3, and φ4 of the other power rollers 1, 3, and 4, and a difference occurs in the tilt angles of the power rollers.

  In such a case, when the tilt angles of the power rollers 1, 2, 3, and 4 are φ1, φ2, φ3, and φ4, | φ1−φ2 | | Φ1-φ3 |, | φ1-φ4 |, | φ2-φ3 |, | φ2-φ4 |, | φ3-φ4 | are detected, and the pressing force of the hydraulic pressing device 7 is determined from the maximum tilt angle difference. And the pressure of the pressing device 7 is increased.

  By increasing the pressure, it is possible to align the tilt angles of the power rollers.

  According to this embodiment, since the measurement of the tilt angle of the power roller is measured with a potentiometer, the number of parts can be reduced, the cost is reduced, and the measurement reliability is improved because of the contact type measurement. In addition, since complicated detection is not required and early detection by a potentiometer can be performed, more reliable and responsive control is possible.

  The toroidal type continuously variable transmission of the present invention can be used as a transmission of various mechanical devices or a power transmission device in addition to a transmission of an automobile.

1 Power roller
2 Power roller
3 Power roller
4 Power roller
5 Outer disk
6 Inner disc
7 Pressing device
8 Trunnion
9 Axis
10 Potentiometer
11 Swing part
12 Fixed part

Claims (2)

An outer disk, an inner disk arranged coaxially with the outer disk, a plurality of trunnions that swing about a pivot that is twisted with respect to the central axes of the outer disk and the inner disk, and supported by the trunnion A toroidal continuously variable transmission comprising a plurality of power rollers that are tiltably sandwiched between the outer disk and the inner disk, and a pressing device that axially presses the outer disk or the inner disk. ,
A toroidal continuously variable transmission characterized in that a tilt angle of a power roller is measured by a potentiometer, and an excessive slip of the power roller is determined by a difference in tilt angle of each power roller.   The toroidal continuously variable transmission according to claim 1, wherein the pressure of the pressing device is increased when it is determined that the sliding is excessive.

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