JPH0235249A - Power transmission device with planet roller - Google Patents

Abstract

PURPOSE:To eliminate backlash by forming eccentrically the axes of No.1 shafting part bearing a planet roller and No.2 shafting part to be fitted on the carrier rotatably among those shafts which are fitted on the carrier. CONSTITUTION:When a penetrative bolt 6 is driven into a screw hole 1B, the fit amount of a wedge member 5 increases, and the outside dia. of a sun roller 1 is enlarged by the wedge action. Now a planet roller 7 inscribing with an outer roller 8 and circumscribing with the sun roller 1 moves in the radial direction while guided by No.1 shafting part 11A, which rotates along an arc of circle round the axis of No.2 shafting part 11B fitted on the carrier 10, and their contacting forces increase without involving backlash to result in increase of the friction force, and the transmission efficiency is enhanced. When a casing 2 is fixed, the drive torque on No.1 rotary shaft 4 is transmitted to No.2 rotary shaft 9 through the roller 7 and carrier 10 at a certain gear ratio in the same direction. When the shaft 9 is fixed, the roller 8 is deceleratively rotated in the opposite direction to the shaft 4.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a planetary roller type power transmission device, and particularly to a planetary roller type power transmission device that transmits power by the frictional force of rollers that are in contact with each other.

[Prior Art] In general, a planetary roller type power transmission device applies pressure to each other between a sun roller, a planetary roller, and an outer roller, and uses the frictional force generated by this pressure to transfer power between each roller. I am trying to convey this. In order to apply such pressure, the inner diameter of the outer roller is reduced and the diameter of the sun roller is increased, so it is necessary to allow the entire planetary roller to move slightly in the radial direction. be done.

Conventionally, in order to meet such requirements, for example,
What is described as prior art in Publication No. 18148 is
A radial groove is provided in the carrier, and both ends of the planetary pin supporting the planetary roller are inserted into this groove with a slight assembly clearance.

However, although this technology allows minute movements in the radial direction, it is necessary to have some play, so play in the circumferential direction inevitably exists, and the power transmission device should originally be free of backlash. , there was a problem that backlash occurred.

Therefore, in order to solve this problem, the one described in the above publication provides a circumferential gap between the bearing inner ring of the planetary roller and the planetary bin, and at the same time, a notch surface provided parallel to each other in the planetary bin is used to They are arranged radially to the heart. A semi-cylindrical actuating piece having a radius slightly smaller than the radius of the bearing inner ring is inserted into the space on both sides of the bearing inner ring and the notch surface of the planet pin.

[Problem to be solved by the invention] However, such conventional devices use a large number of parts such as planetary pins and actuating pieces, and their shapes are complicated, so they are not easy to process and are extremely expensive. There was a problem that I had no choice but to do so.

Furthermore, since the 1,000-cylindrical actuating piece with a radius slightly smaller than the radius of the bearing inner ring is inscribed in the bearing inner ring, the planetary roller cannot move sufficiently in the radial direction. There was also the problem that force was required and the inner ring of the bearing was deformed.

An object of the present invention is to eliminate such conventional problems and to provide an inexpensive planetary roller type power transmission device that has a simple structure and is free from backlash.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a plurality of sun rollers that are pressed against the outer periphery of a sun roller connected to a first rotating shaft and the inner periphery of an outer roller fixed to a casing. In a planetary roller type power transmission device in which planetary rollers are rotatably supported by a shaft attached to a gear rear connected to a second rotating shaft, one of the planetary rollers is rotatably supported by a shaft attached to a gear rear connected to a second rotating shaft. It is characterized in that the axes of the first shaft part supported and the second shaft part rotatably mounted on the carrier are eccentric.

"Operation" According to the present invention, when the diameter of the sun roller is increased, for example, in order to increase the pressure contact force, the planetary rollers that are in pressure contact with the sun roller tend to move in the radial direction. At this time, the planetary roller moves while being guided by the first shaft part which rotates around the axis of the second shaft part which is rotatably attached to the carrier.

Therefore, the planetary roller can be moved in the radial direction only by the rotation mechanism, and backlash does not occur.
Also, it does not require much force to move.

[Examples] Examples of the present invention will be described below with reference to the accompanying drawings.

An embodiment of the present invention is shown in FIGS. 1 and 2. FIG.

In the figure, reference numeral 1 denotes a sun roller connected to a first rotating shaft 4 rotatably supported by a casing 2 via a bearing 3.

The sun roller 1 is provided with a tapered hole 1Δ at its center and a threaded hole IB continuous to the bottom of the tapered hole IA. A truncated conical wedge member 5 with a through hole 5A formed in the center is fitted into the tapered hole 1Δ, and a through bolt 6 inserted through the through hole 5A is screwed into the screw hole 1B. The amount of axial movement of the wedge member 5, that is, the amount of fitting is adjusted.

7 is a planetary roller, and the outer periphery of the sun roller 1,
and contacts the inner periphery of the outer roller 8 fixed to the casing 2. The planetary roller 7 is attached to a pivot pin 11 rotatably attached to a carrier lO connected to a second rotating shaft 9.
It is rotatably supported via bearings 12, and the number thereof is generally three or six.

The pivot pin 11 consists of a second shaft portion 11B rotatably attached to the carrier lO, and a first shaft portion 118 rotatably supporting the planetary roller 7 via a bearing 12. The axis is eccentric by a distance d.

In this embodiment, which has the configuration as described above, as the through bolt 6 is screwed into the tapped hole IB, the amount of engagement of the wedge member 5 increases, and the outer diameter of the sun roller 1 is expanded due to the wedge action. Ru. Then, the planetary roller 7, which is inscribed in the outer roller 8 and circumscribed in the sun roller 1, moves as shown by arrow A in FIG.
It moves in the radial direction while being guided by the first shaft part 11A that rotates in an arc shape around the axis of the second shaft part 11B attached to the carrier 10, and the pressure contact force with each other is maintained without backlash. increases, resulting in an increase in frictional force,
Transmission efficiency is improved.

Therefore, if the casing 2 is fixed, the first rotating shaft 4
The driving torque is transmitted to the second rotating shaft 9 via the planetary roller 7 and the carrier IO in the same rotational direction with a predetermined reduction ratio.

Furthermore, if the second rotating shaft 9 is fixed, the planetary roller 7 will only rotate and the outer roller 8 and therefore the casing 2 will be
The rotation axis 4 is decelerated and rotated in the opposite direction.

Here, if the outer diameter of each roller decreases due to friction caused by long-term operation, the through bolt 6 is further tightened to increase the amount of fitting and adjust the pressing force.

In this embodiment, it goes without saying that the present invention is also applicable to a type in which the diameter of the force-reducing outer roller 8 is reduced, although the diameter of the sun roller 1 is increased to adjust the pressing force. do not have.

[Effects of the Invention] As is clear from the above description, according to the present invention, the axes of the first shaft portion supporting the planetary roller and the second shaft portion rotatably attached to the carrier are Since they are eccentrically arranged, it is possible to obtain an inexpensive planetary roller type power transmission device with a simple structure and no backlash.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view showing an embodiment of the present invention, and FIG. 2 is a sectional view taken along the line II--II in FIG. DESCRIPTION OF SYMBOLS 1... Sun roller, 18... Taper hole, IB... Screw hole, 4... First rotating shaft, 5... Wedge member, 6... Through bolt, 7... Planetary roller, 8...Outer roller, 9...Second rotating shaft, lO...Carrier, 11...Pivot pin, 11Δ...First shaft portion, 11B...Second shaft part.

Claims (1)

[Claims] 1) A plurality of planetary rollers that are pressed against the outer periphery of the sun roller connected to the first rotating shaft and the inner periphery of the outer roller fixed to the casing are connected to the second rotating shaft. In a planetary roller type power transmission device rotatably supported by a shaft mounted on a connected carrier, a first shaft portion of the shaft mounted on the carrier, which supports the planetary roller, and a first shaft portion supporting the planetary roller are connected to the carrier. A planetary roller type power transmission device characterized in that the axes of a second shaft portion rotatably mounted are eccentric.