JPS6128852B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rolling transmission type planetary roller device having a clutch function that transmits rotation of an input shaft to an output shaft after a predetermined rotation speed.

A conventional rolling transmission type planetary roller device used in a rolling reducer etc. is shown in Fig. 1a, which shows its axial cross-sectional structure, and Fig. 1, which shows its BB arrow view.
As shown in FIG. b, an input shaft 1 and an output shaft 2 coaxial therewith are rotatably attached to a housing 5 via bearings 3 and 4, respectively. A rolling guide ring 7 coaxial with the sun roller 6 is fixed in the housing 5 around the sun roller 6 formed on the input shaft 1. A plurality of (three in the figure) planetary rollers 8 that roll into contact with these are arranged at equal intervals between them. Further, a planetary pin 10 to which each planetary roller 8 is rotatably attached via a bearing 9 is fitted into a disc-shaped carrier 11 formed on the output shaft 2 so that a plurality of planetary rollers 8 are arranged at equal intervals. It is worn.

According to this, the input shaft 1 is
In order to transmit the rotation of 6 and the rolling guide ring 7. In other words, the rolling guide ring 7 is twice the outer diameter of the planetary roller 8 and the sun roller 6
The inner diameter is slightly smaller than the sum of the outer diameter and the outer diameter. Therefore, in this type of device, the pressure contact forces between the sun roller 6 and the planetary rollers 8 and between the planetary rollers 8 and the rolling guide ring 7 are always set to be constant. The frictional force acting between the two was always constant, and there was no clutch function at all.

Incidentally, in general, such a rolling transmission type planetary roller device is rarely used alone, but is usually used as an element of various power transmission mechanisms. Practically,
Very often, a clutch mechanism is required that cuts off power transmission when the rotational speed of the input shaft 1 falls below a certain value. In such a case, since the aforementioned rolling transmission type planetary roller device does not have any clutch function, conventionally a clutch mechanism as shown in FIG. 2 has been incorporated into the rolling transmission type planetary roller device. This FIG. 2 shows the concept of the mechanism, and the same members as shown in FIG. 1 are designated by the same reference numerals. Fig. 2a shows a clutch 12 whose operation is controlled by a rotation speed detector (not shown) is connected to the input shaft 1, and Fig. 2b shows a rolling guide ring 7 and a housing. Clutch 1 between 5 and 5
3, which is operated by a rotation speed detector (not shown), but the former requires an extra axial space for the clutch 12, and the latter requires radial space. Clutch 1
3, an extra space was required for the clutch, and there was a drawback that the manufacturing cost for the clutch alone increased.

It is an object of the present invention to overcome the drawbacks of the conventional rolling transmission type planetary roller device and to provide a rolling transmission type planetary roller device having a novel structure and having a built-in clutch function.

The configuration of the rolling transmission type planetary roller device having a clutch function according to the present invention that achieves this object is that an input shaft and an output shaft coaxial with the input shaft are each attached to the input shaft within a casing that rotatably supports the device. A rolling guide ring coaxial with the sun roller is fixed, and a planetary pin is formed on the output shaft to which a plurality of planetary rollers are rotatably attached, each rollingly contacting the rolling guide ring and the sun roller. In a rolling transmission type planetary roller device that is fitted into a planetary pin support hole of a carrier and transmits rotation of the input shaft to the output shaft via the planetary roller, when the sun roller is compressed in the axial direction, The sun roller is formed of an elastic ring that is expanded in the radial direction so that rotation of the input shaft is transmitted to the output shaft, and rotates in the radial direction of the input shaft in response to centrifugal force accompanying the rotation of the input shaft. One end of the moving pressing arm is pinned to the input shaft, and further slides into contact with the other end of the pressing arm, and the rotation of the pressing arm moves along the input shaft to move the sun roller in the axial direction. The invention is characterized in that a sliding ring capable of being compressed to a height is slidably fitted on the input shaft between the sun roller and the pressing arm.

Hereinafter, an embodiment of the rolling transmission type planetary roller device having a clutch function according to the present invention will be described in detail with reference to the drawings from FIG. 3 onwards.

As shown in FIG. 3 showing the cross-sectional structure of this embodiment, an output shaft 15 whose one end protrudes from the housing 14 is rotatably attached to the housing 14 via a bearing 16. An input shaft 17 whose other end protrudes from the housing 14 is rotatably attached to the output shaft 15 and the housing 14 via two bearings 18 and 19 so as to be coaxial with the output shaft 15.
A sun roller 20 spline-fitted to the input shaft 17
A rolling guide ring 21 coaxial with the sun roller 20 is fixed in the housing 14 around the sun roller 20, and a rolling guide ring 21 is provided between the rolling guide ring 21 and the sun roller 20 so as to be in rolling contact therewith. A plurality of planetary rollers 22 are arranged at equal intervals. Further, the planetary pins 24 to which the planetary rollers 22 are rotatably attached via bearings 23 are fitted into a disc-shaped carrier 25 formed on the output shaft 15 so that the plurality of planetary rollers 22 are spaced at equal intervals. It is worn.

The sun roller 20 is formed of an elastic ring with a U-shaped cross section whose outer diameter uniformly expands when an axial pressing force is applied to both end faces of the sun roller 20. When no axial pressing force is applied to both end surfaces, a gap is formed between the sun roller 20 and the planetary roller 22, and the sun roller 20 rotates idly relative to the planetary roller 22. A fixing nut 26 that contacts one end surface of the sun roller 20 is screwed into one end of the input shaft, and a sliding ring 27 that faces this fixing nut 26 with the sun roller 20 in between is attached to the input shaft 17. It is in a spline-fitted state. Therefore, this sliding ring 27 is fixed with the fixing nut 2.
When the solar roller 20 moves toward the 6 side, the sun roller 20 is compressed in the axial direction and expanded in the radial direction, so that a pressing force is applied between the sun roller 20 and the planetary roller 22. As shown in FIG. 4, which shows a cross section in the direction of the - arrow in FIG.
As shown in FIG. 5, which is an enlarged view of this part, one end of the pressing arm 29 is rotatably attached in the radial direction with respect to the sliding ring 27. A pin 32 that rotatably supports the contacting pressing roller 31 is fitted, and the pressing arm 29 rotates around the pin 28 due to the centrifugal force that increases as the rotation speed of the input shaft 17 increases. As a result, the sliding ring 27 is pressed toward the fixing nut 26. In addition, the code 33 in the figure
is a spacer that adjusts so that the sun roller 20 is not compressed in the axial direction more than necessary and the pressure contact force with the planetary roller 22 becomes too large.
0 and is fitted into the input shaft 17.

When a pressing force is applied along the axial direction to both end faces of the sun roller 20 from the state shown in FIG. Crowning deformation occurs in an arc, but the free deformation is restrained by the planetary rollers 22, and a pressing force corresponding to the amount of restraint is generated between the sun roller 20 and the planetary rollers 22. Since the amount of crowning deformation increases approximately in proportion to the pressing force, the sun roller 20 and the planetary roller 2 in the no-load state shown in FIG.
By making the gap between the first and second parts sufficiently small, it is possible to make the pressing force and the pressing force almost proportional to each other.

Therefore, when the pressing force is small or does not act, a gap is formed between the sun roller 20 and the planetary roller 22, so no frictional force is generated, and the carrier 25 remains stationary even when the input shaft 17 rotates. The power remains in a state where the power is cut off. Furthermore, when a large pressing force is applied, a corresponding pressing force is formed, so that there is a force proportional to the pressing force between the sun roller 20 and the planetary roller 22, and between the planetary roller 22 and the rolling guide ring 21. A frictional force is generated, and the corresponding power is transmitted from the input shaft 17 to the output shaft 25.

By the way, the pressing force of the sliding ring 27 against the sun roller 20 due to the centrifugal force generated with the rotation of the input shaft 17 is applied to the pin 28, the pressing roller 31, and the tapered surface of the sliding ring 27 relative to the center of gravity of the pressing arm 29. The input shaft can be changed arbitrarily by appropriately selecting the relative relationship such as the contact position with the pressing arm 30, the mass of the pressing arm 29, the number of the pressing arms 29, and the taper angle of the tapered surface 30 of the sliding ring 27. It becomes possible to adjust the rotation of the input shaft 17 to be transmitted to the output shaft 15 or not to be transmitted after reaching a specific rotation speed of 17.

According to the rolling transmission type planetary roller device of the present invention that also has a clutch function, the sun roller is formed by an elastic ring that utilizes centrifugal force that changes according to the rotation of the input shaft. Power is transmitted to the output shaft only when
Extremely useful. In addition, it is possible to make the clutch cheaper and more compact than the conventional clutch provided separately.

[Brief explanation of the drawing]

Figure 1a is a sectional view showing the schematic structure of a conventional rolling transmission type planetary roller device, and Figure 1b is its B-
It is a sectional view taken along arrow B, and FIGS. 2a and 2b are principle diagrams showing the concept of a conventional rolling transmission type planetary roller device in which a clutch is incorporated. Further, FIG. 3 is a sectional view showing a part of the schematic structure of an embodiment of a rolling transmission type planetary roller device having a clutch function according to the present invention, and FIG. 4 is a sectional view thereof taken along the arrow.
FIG. 5 is an enlarged view of this part corresponding to FIG. 3, and FIG. 6a is a partially enlarged view of this part corresponding to FIG. FIG. 6b is a partially enlarged view corresponding to FIG. 3 in a state where power is being transmitted between the input shaft and the output shaft. In the drawing, 14 is a housing, 15 is an output shaft, 1
7 is an input shaft, 20 is a sun roller, 21 is a rolling guide ring, 22 is a planetary roller, 24 is a planetary pin, 25 is a carrier, 26 is a fixing nut, 27 is a sliding ring, 28 is a pin, 29 is a pusher The attachment arm, 30 is a tapered surface of a sliding ring, and 31 is a pressing roller.

Claims (1)

[Claims] 1. A rolling guide ring coaxial with the sun roller attached to the input shaft is fixed in a casing that rotatably supports an input shaft and an output shaft coaxial with the input shaft, and the rolling guide ring and the sun roller are fixed. A plurality of planetary rollers that are in rolling contact with the rollers each have a planetary pin rotatably attached thereto, each of which is fitted into a planetary pin support hole of a carrier formed on the output shaft, and the rotation of the input shaft is controlled by the planetary rollers. In the rolling transmission type planetary roller device, when the sun roller is compressed in the axial direction, it is expanded in the radial direction so that the rotation of the input shaft is transmitted to the output shaft. One end of a pressing arm that forms the sun roller and rotates in the radial direction of the input shaft in response to centrifugal force accompanying rotation of the input shaft is pinned to the input shaft, and the other end of the pressing arm is pinned to the input shaft. A sliding ring is provided on the input shaft between the sun roller and the pressing arm, and is capable of sliding along the input shaft and compressing the sun roller in the axial direction by rotation of the pressing arm. A rolling transmission type planetary roller device that also has a clutch function and is characterized by being slidably fitted.