JPS5810040Y2 - Rolling transmission type planetary roller device - Google Patents

Description

[Detailed description of the invention] An example of a conventional rolling transmission type planetary roller device will be explained with reference to FIGS. Planetary rollers (three in the drawing) are arranged at equal intervals, 3 is an inner roller inscribed on the outer periphery of these planetary rollers 2, and is fixed to the casing 4.

The planetary roller 2 is supported on the axis of a planetary pin 5 via a bearing 6, and both ends of the planetary pin 5 are inserted into radial grooves of the carrier 7, allowing free movement in the radial direction.

Reference numeral 8 denotes a cover of the device, which is fixed to the casing 4 with bolts 9.

10. 11, 12, 13 are the sun roller 1 and carrier γ
These are bearings that support each.

When operating the rolling transmission type planetary roller device of FIG. 1 and FIG. Although it is necessary to apply a pressing force PN in the direction (hereinafter referred to as normal force), the drawing assumes that the normal force PN is generated by press-fitting the respective rollers during assembly.

When operating in this state with the sun roller 1 as the input shaft and the carrier 7 as the output shaft, rolling transmission force is generated in the contact portion (hereinafter referred to as the pressure contact surface), and the planetary roller 2 revolves while rotating.

However, only the revolution speed of the planetary roller is taken out to the carrier 7, and a rotation speed lower than that of the sun roller 1 (input shaft) is obtained.

However, when a rolling transmission type planetary roller device having the basic structure described above is operated at high speed, various problems as shown below occur.

That is, since the centrifugal force F 2 due to the revolution of the planetary bin 5 acts on the shaft 6, there is a drawback that the life of the bearing is significantly reduced.

Furthermore, due to the centrifugal force F1 caused by the revolution of the planetary bin 5, bearing 6, and planetary roller 2, an excessive pressing force PNt (PNt>PN) acts on the pressure contact surface of the planetary roller 2 and the inner roller 3.
In addition to reducing the durability of the pressure contact surface, the planetary roller 2
and the pressing force PN of the contact surface of the sun roller 1 decreases to PNS
(PN8quaN), which has the drawback of causing a decrease in transmitted power due to a decrease in rolling transmission force.

The present invention was proposed in order to eliminate the above-mentioned drawbacks of the conventional technology. By fitting a circular ring in which each of the support shafts is simultaneously inscribed on the tapered surface, the radial component force generated from the tapered surface when the circular ring is pressed in the axial direction can be eliminated. It is an object of the present invention to provide a rolling transmission type planetary roller device which can be adjusted in steps and in which the centrifugal force acting on the planetary roller etc. during rotation is supported by the ring.

Embodiments of the present invention will be described below with reference to the drawings.

In addition, in FIGS. 3 to 5 showing examples of the present invention,
The same parts as in FIGS. 1 and 2 will be explained using the same reference numerals.

First, in the first embodiment shown in FIGS. 3 and 4, 1a is a sun roller integrated with the input shaft, and 2a is a plurality of sun rollers (3 in Example Z) arranged at equal intervals around the groove 1b of the sun roller 1a. The arranged planetary rollers 3 are inner rollers inscribed in the outer periphery of these rollers, and are fixed to the casing 4.

The planetary roller 2a is supported on the axis of the planetary pin 5a via a bearing 6, and both ends of the planetary pin 5a are inserted into the radial grooves of the carrier 7, so that the planetary roller 2a can freely move in the radial direction. It has been stolen.

8 is a cover fixed to the casing 4 by bolts 9, and 10, 11, 12, and 13 are bearings that support the sun roller 1a and the carrier 7, respectively.

Reference numeral 14 denotes a circular ring, and a plurality of planetary pins 5a (three in this example) are arranged at equal intervals on the circumference, and the ends of both ends of the outer periphery are inscribed (point Q) in a tapered surface with a small diameter. It has been inserted.

The inner periphery of the housing ring 14 is tapered, and is inscribed in the tapered surface of the outer periphery of both ends of the planetary pin 5a, and a plurality of rings 14 are arranged at equal intervals on the circumference of the planetary pin 5a in the middle of the planetary pin 5a. (
By adjusting the tightening torque of the bolts 15 and nuts 16 (three in the embodiment), the radial component force Pr generated on the tapered surfaces at both ends of the planetary pin 5a and the inscribed tapered surface of the ring 14 can be adjusted as desired. And it can be adjusted steplessly.

Note that the tightening force of the three bolts 15 and nuts 16 can be made equal by means such as a torque wrench or a rotation angle method.

Further, it is assumed that the pressing force PN necessary for transmitting power is formed at the time of assembly in the same manner as in the conventional embodiment shown in FIG.

The action of the ring 14 obtained by operating the rolling transmission type planetary roller device having the basic structure described above at high speed is as follows.

First, the revolving elements (planetary roller 2a, planetary pin 5a bearing 6)
The centrifugal force F1 acts on the ring 14.

This further reduces the increase in the pressing force PN on the pressing surface between the planetary roller 2a and the inner roller 3, and also reduces the pressing force PN on the pressing surface between the planetary roller 2a and the sun roller 1a.
Although the decrease in radial force Pr generated from the tapered surface is also reduced, the effect is greater as the tightening torque of the bolt 15 and nut 16 is increased to increase the radial component force Pr generated from the tapered surface.

As a result, it is possible to improve the durability of the contact surface between the planetary roller 2a and the inner roller 3, and to reduce the reduction in rolling transmission force at the contact surface between the planetary roller 2a and the sun roller 1a.

FIG. 5 shows another embodiment, in which the inner periphery of the ring 14a is tapered, and the ring 14a is inscribed in the tapered surface of the outer periphery of both ends of the planet pin 5b, and is adjusted to be screwed into the hollow hole of the planet pin 5b. By adjusting the pressing force of members 17 and 18 against the side surface of the ring 14a, the tapered surfaces of both ends of the planetary pin 5b and the circle f
The radial component force Pr generated by the inscribed tapered surface of JJ 14a can be adjusted steplessly and arbitrarily.

In the embodiment shown in FIG. 5, the centrifugal force is reduced by the hollow hole of the planetary pin 5b, and the adjustment members 17, 18 of the housing are
Reduction holes 17a and 18a are also provided in the holes, and
A square hole 11b for rotating the adjustment member.

Although this embodiment differs from the embodiment shown in FIG. 3 in that 18b is provided, there is no difference in operation and effect.

As explained in detail above, according to the present invention, the centrifugal force acting on the planetary roller etc. can be reduced by using the ring, and as a result, the pressing force of the planetary roller against the input shaft does not decrease. , there will be no reduction in power transmission.

Furthermore, since the centrifugal force is reduced as described above, the durability of the pressure contact surfaces between the planetary roller and the inner roller can be improved.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view of the upper half of a rolling transmission type planetary roller device showing a conventional example, Fig. 2 is a sectional view taken along line XX in Fig. 1, and Fig. 3 is a rolling sectional view showing an embodiment of the present invention. 4 is a side sectional view of a power transmission type planetary roller device, FIG. 4 is a YY sectional view of FIG. 3, and FIG.
FIG. Explanation of the main parts of the diagram: 1a...Sun roller (input shaft), 2a...Planetary roller, 3...
Inner roller, 5a... Planet pin (spindle), 7...
...Carrier (output shaft), 14...Circle,
15...Bolt, 16...Natsuto.

Claims (1)

[Scope of utility model registration request] In a rolling transmission type planetary roller device that transmits power from the input shaft to the output shaft, a planetary roller is interposed between the input shaft and the output shaft, and is engaged with the output shaft so that it can move in the radial direction. The outer circumferential surfaces of both ends of the support shafts of the planetary roller are formed into tapered surfaces with small diameter ends, and a ring in which each of the support shafts is simultaneously inscribed is fitted into the tapered surface, and the ring is axially corrected. The radial component force generated from the tapered surface when pressed against the tapered surface can be adjusted steplessly, and the centrifugal force acting on the planetary roller etc. during rotation is supported by the annular ring. A rolling transmission type planetary roller device.