JPS5891954A - Planetary roller type power transmission device - Google Patents

Abstract

PURPOSE:To give a sufficient response to the high-speed revolution of an input shaft by fixing two pairs of planetary roller mechanisms and solar rollers on the single input shaft for replacing the bearing function of the input shaft with rolling contact between planetary rollers and solar rollers. CONSTITUTION:An external radial load worked on the end of an input shaft 8 is supported by two pairs of roller sets, that is, one with a solar roller 1, planetary rollers 2, and an inner roller 3, and the other with the second roller 1', the second planetary rollers 2', and the second inner roller 3'. Therefore, generally speaking, this construction does not require a traditional type bearing for the input shaft 8 revolving at the maximum number in this device, and enables the high-speed revolution comparatively easily for improving reliability as well as durability.

Description

[Detailed Description of the Invention] The present invention comprises a sun roller fixed to an input shaft, an inner roller fixed to a casing surrounding the sun roller, and a sun roller that is pivotally supported on the output shaft side and arranged between the sun roller and the inner roller. The present invention relates to a planetary roller type power transmission device configured with a plurality of planetary rollers.

A plurality of planetary rollers are circumscribed on the surface of the sun roller,
Further, on the outside thereof, a conventional rolling transmission device of a type in which an inner roller fixed to the casing is placed inside and the number of revolutions of the planetary roller when the sun roller 1 is used as the input shaft is outputted to the output shaft is installed. 2, in which (1) is a sun roller that is directly connected to and driven by an input shaft (8), (13)
is a bearing of the input shaft (8), (2) is a planetary roller rotatably supported on a pin (5) via a bearing (4), and a plurality of them are attached to the carrier (6), Bearing (14
) is adapted to revolve on an output shaft (11) supported by (3) is an inner roller, which is fixed to the surrounding casing (10) via a pin (9), is in circumscribed contact with the plurality of planetary rollers (2), and is attached to the cage jig (10). cover attached with bolts (12) to
A shim (15) of an appropriate thickness is inserted between the inner roller (16) and the inner roller side surface (3b), a pressing force T is applied to the inner roller (3), and the resulting pressing force P is applied in the rotational direction. It is designed to transmit power by generating a fist friction force.

Furthermore, to explain the mechanism that generates the above-mentioned pressing force P with reference to FIG.
When a pressing force T is applied to 3b), the wall thickness becomes 12
<The formed thin cylindrical portion (3a) on the inner diameter side undergoes elastic deformation and extends in an arched manner toward the inner diameter side, resulting in crowning C', so that the inner diameter of the inner roller (3) is reduced from Dl to h. However, since the planetary roller (2) and the sun roller (1), which are sufficiently rigid, are inscribed on the inner diameter side, the crowning is restrained by C'-h and a pressing force P is generated. In addition,
h is the initial gap in the radial direction that existed in the free form 11A on which the pressing force P was not applied.

However, in the above-mentioned conventional planetary roller type power transmission device, K
The diameter Da of the sun roller (1) is smaller than the diameter of the ajL roller (2), and the planet and roller (2)
Comparing the rotational speeds of the bearing (4) of the input shaft (8), the bearing (13) of the input shaft (8), and the bearing (14) of the output shaft (11), it is found that the bearing (13) rotates at the highest speed, which places the device in the high-speed region. If the bearing (13) is used for this purpose, it is necessary to make the bearing (13) sufficiently practical in terms of performance and durability.There are limits to the modification of the bearing; The disadvantage is that the conditions for use as a device are limited by the performance of the device.

The present invention solves the above-mentioned difficulties in the conventional planetary roller type power transmission device. In a planetary roller type power transmission device including a plurality of planetary rollers pivotally supported by a carrier connected to an output shaft, a second sun roller of the sun roller is fixed to the input shaft. It is characterized in that a plurality of second planetary rollers are provided in conjunction with the second sun roller and the second inner roller fixed to the casing, and its purpose is By eliminating the bearing on the input shaft on the sun roller side that rotates at the highest speed, the factors that limit the use of the bearing are removed, and the radial load and thrust at the end of the input shaft are eliminated. The object of the present invention is to provide a planetary roller type power transmission device that can tolerate a load.

Authentic steel has the above-mentioned configuration, with K between the sun roller fixed to the input shaft and the inner roller fixed to the surrounding casing, and a plurality of rollers pivotally supported by a carrier connected to the output shaft. In addition to the power transmission system in which the planetary rollers are arranged, a second solar roller is fixed to the input shaft and is attached thereto, and the second solar roller and a second inner roller fixed to the casing are provided. Since a plurality of second planetary rollers are arranged between the The bearing function of the input shaft, which shares the rotation center of the sun roller, is replaced by the rolling contact motion with the planetary roller accompanying rolling conduction, and has a bearing function that can sufficiently cope with the high-speed rotation of the input shaft. The radial load and thrust load can be tolerated, and the reliability is 1. ``It is durable and can be used in high-speed areas.

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

FIG. 3 shows a first embodiment of the present invention, and (1) in FIG.

(1 inch is the outer diameter D connected directly to the input shaft (8).
a. D's sun roller and second sun roller, (2)
k ↓ Taisun roller (1) K is a planetary roller with an outer diameter Dp circumscribed by K, which is rotatably supported on a pin (5) via a bearing (4), and a pin ( 5), so that at least three of them are arranged and revolve around an output shaft (11) supported by a bearing (14).

(2') is a second planetary roller with an outer diameter D that circumscribes the second sun roller (1'), and is rotatably mounted on a pin (5 points above) via a bearing (4'). The input shaft (
k so that it revolves around 8). (3).

(3') is an inner roller and a second inner roller, in which a planetary roller (2) and a second planetary roller (2') are inscribed, respectively, and pins (9) and (9'). Through the surrounding casing (10) K is fixed. cover(
13) is attached to the casing (IO) by a bolt (12), and the inner roller (3) and the second inner roller (
A spacer (16) is interposed between the inner roller (3') to maintain an appropriate distance LK, and a shim (15) of an appropriate thickness is installed between the inner roller (3) and the second inner roller (3'). 3')
Pressure forces p and p' act on the roller set K of the sun roller (1), planetary roller (2), and inner roller (3), and a pressure contact force P is applied to the roller set of the sun roller (1), the planetary roller (2), and the inner roller (3). ′：
#! 2 planetary rollers (2') and #! 2 inner roller (
The structure is such that a pressing force P' is generated on the second roller set (3').

The first embodiment shown in FIG. 3 has the above-described structure, so the sun roller (1), which is a roller set,
The pressing force P acting between the planetary roller (2) and the inner roller (3) causes a frictional force between each of the rollers, which causes a force to be generated between the input shaft (8) and the output l1l (11). is transmitted.

A second sun roller (one,
The pressing force P' acting between the second planet (2') and the second inner roller (3') is the power generated between the input shaft (8) and the output shaft (11). A 1M2 inner roller (3') which is not directly involved in transmission and whose center position in the radial direction is correctly regulated by the casing (10), and at least three second planetary rollers (2') inscribed therein. This via Ell
The second sun roller (which plays the role of regulating one center of rotation)

On the other hand, the rotation center of the sun roller (1) is the planetary roller (2).
) is indirectly regulated by the bearing (14).

Further, the relationship between the rotational speeds of each member in the first embodiment is as follows: n6: rotational speed of the carrier (6) ny: rotational speed of the support plate (7) n8: rotational speed of the input shaft (8) Di: planetary Outer diameter of roller (2), diameter of double sun roller (1) [)/1: outer diameter D' of second planetary roller (2')
8: Diameter R of second sun roller (1') = D1/D11
...-(1) R': D'V(y, --+21, α6=ng -'-(3) (R+1) ny = ns (R/ +1 >"'"" +41
The carrier (6) and the support plate (7) can be expressed as
) is established Menno 1 [, so n6 ”:
It does not have to be ny, and the diameter ratio R' can be arbitrarily set regardless of H.

Therefore, in order to improve the load capacity for the external radial load Ra on the input shaft (8) side, D'1>Dt, D'p)
Dp.

It is also free to configure it as 5, such as D's>Ds.

With the above structure, the external radial load acting on the shaft end of the input shaft (8) is transferred to two pairs of roller sets, namely, the sun roller (1) - the planetary roller (2) - the inner roller (3) and the third roller. The second sun roller (1') - the second planet will be supported by the second inner roller (3').Also, the large external thrust load will be applied to the sun roller. It is supported by the bearing (14) via the planetary roller (2) and carrier (6) by the collar (1a) or (1b) of (1).

Therefore, due to the above-described structure and operation, the input shaft (8), which generally rotates the highest in the device, does not require a conventional bearing, resulting in a relatively low K.

High speed rotation is easily possible.1. Durability and reliability are also significantly improved.

Furthermore, a second embodiment of the present invention is shown in FIG. Only the structure arranged on the circumference of the part is different from that of the first embodiment shown in FIG. 3, and other structural options are the same as shown by the same reference numerals. .

Therefore, in this second embodiment, the planetary roller (2) and the second
Although the rotational speeds of the planetary rollers (2') are different, the revolution speeds are the same. That is, (3
), in equation (4), n6 = n 7 Therefore, R = R'
Each roller set (1, 2, 3), (1') so that

2', 3') are configured.

Therefore, in the first embodiment, the second row two sets (1'
, 2', 3') only had the function of supporting the input shaft (8), whereas in the second embodiment, the planetary roller (2) and the second planetary roller ( Since the two rollers rotate at the same revolution speed and are supported by the same carrier (6), the second roller set (1', 2
Power transmission between the input shaft (8) and the output shaft (11) is also carried out by the *vibration force generated by the pressing force P' acting between the input shaft (8) and the output shaft (11). That is, compared to the first embodiment, the power transmission capacity is increased, and other functions and effects can be substantially the same.

Although the present invention has been described above with reference to embodiments, it goes without saying that the present invention is not limited to such embodiments, and that various design changes can be made without departing from the spirit of the present invention. .

[Brief explanation of drawings]

#t1 is a vertical cross-sectional view of a conventional planetary roller power transmission device (the lower part is partially omitted), FIGS. 2A and 2B are action explanatory diagrams of FIG. 1, and FIG. FIG. 14 is a longitudinal sectional view showing a second embodiment of the present invention. 1: sun roller, 1': second sun roller. 2: Planetary roller, 2': Second planetary roller. 6: inner roller, 3': second planetary roller. 4, 4', 14: Bearing e 5+ 5': Pin, 6.6tL, 6b: Carrier, 7: Support plate, 8: Input shaft. 9.9': Bin, 10: Casing, 11: Output shaft, 15: Shim.

Claims (1)

[Claims] Planetary roller type power transmission in which a plurality of planetary rollers supported by a carrier connected to the output shaft are arranged between a sun roller fixed to the input shaft and an inner roller fixed to the surrounding casing. In the apparatus, a second sun roller is fixed to the front input shaft in addition to the sun roller, and a plurality of rollers are provided between the second sun roller and the second inner roller fixed to the casing. A planetary roller type power transmission device in which a second planetary roller is disposed.