JPS61127963A - Differential planetary roller speed reduction unit - Google Patents

Abstract

PURPOSE:To produce considerably speed reduced output through small outer diameter by means of a differential planetary roller speed change unit having the output shaft arranged approximately on same axis with the input shaft. CONSTITUTION:A plurality of planetary rollers 4 having large diameter section 4a and small diameter section 4b is rolling contacted against the outercircumference between the bearings 2, 3 of input shaft 1. The planetary roller 4 is positioned with equi-interval by means of a holder 5. The projected portion of the tubular section 11a of output shaft formed integrally with the output shaft 11 is fitted in a groove 7a made in the outercircumference of second outer ring 7 arranged over the outercircumference of large diameter section 4a of planetary roller 4. Upon application of rotary force to the input shaft 1, first outer ring 6 will cause rotation of second outer ring 7 with high speed reducing ratio through 3K type differential planetary gear speed reduction unit.

Description

[Detailed description of the invention] (Technical field) The present invention relates to a differential planetary roller speed reducer.

(Background Art) Conventional differential planetary roller of this type, Japanese Patent Application No. 57-333
As seen in No. 69 (Japanese Unexamined Patent Publication No. 58-152963), the outer diameter of the outer ring is geared and output is obtained in the direction of engagement of the outer diameter, and the driven gear receiving this output is safe. ,
The deceleration device as a whole requires a large space, requires a lot of work to cut the gears, and has the drawback of being susceptible to impact loads from the t5 output side.

In addition, an input shaft and an output shaft are arranged on the same axial layer, rotatably supported by the same housing, and the output is output from one outer ring.
However, due to its structure, the shape of the input sun shaft was complicated, and a bearing between the 1st shaft and the 2nd planetary roller was not reliable, which meant that it was not possible to create a small diameter one.

(Objective of the Invention) The present invention has been proposed in view of the above points, and its purpose is to arrange the output shaft on substantially the same axis as the input shaft, to have a large reduction ratio, and to The object of the present invention is to provide a differential planetary roller speed reducer with a simple structure that does not require too much space in the radial direction.

That is, the present invention aims to achieve the above object by providing a plurality of planetary rollers in rolling contact with the outer periphery of an input shaft that is rotationally driven in a differential planetary roller speed reducer, and a plurality of planetary rollers are provided on the outer periphery of the planetary rollers. is fixed number 1. The second of the second outer rings
An open end of a cylindrical portion of an output shaft extending on a substantially concave axis on the opposite side of the input shaft is connected to the outer periphery of the outer ring of the output shaft.
It has certain characteristics.

(Disclosure of the Invention) The figure shows an embodiment of the present invention, in which reference numeral 1 denotes an input shaft that is rotatably driven, and is rotatably supported by T-bearings 2 and 3, which are spaced apart from each other. On the outer periphery #/c between the bearings 2 and 3 of the input shaft 1, a plurality of planetary rollers 4 having a large diameter portion 4a and a small diameter portion 4bt'' are provided in rolling contact.

These planetary rollers 4 are positioned at equal intervals on a retainer 5 formed by a combination of retaining members 5a and 5bi.
A first outer ring 6 and a second outer ring 7 are assembled in such a manner that the large diameter portion 4a and the small diameter portion 4b of these planetary rollers 4 are surrounded and in contact with each other over their entire inner diameter. Note that one of the holding members 5b also plays the role of positioning the planetary rollers 4.

Therefore, the VC is provided on the small diameter i4b of the planetary roller 4.
c A groove 6a is formed on the outer periphery of the first outer ring 6.
6a is formed at the inner end of a substantially cylindrical casing 8, and a companion protrusion is engaged and connected. The outer end of the casing 8 is located on the outer end side of the input shaft l via an oil seal 9, a spacer lO, etc. Note that a companion bearing 2 is located between the planetary roller 4 and the oil seal 9, which is provided on the human power shaft l. In addition, this casing 8 is machined with a large diameter, and the casing 8 is tall! A part of the output shaft 11, etc., which will be described later.
It is fitted into a hollow Q casing ball that can be stored in the t713 section, and this casing ball is fixed to a fixed object on the input side (for example, the outer diameter of a motor, etc.).

Also, the groove 7aK on the outer periphery of the second outer ring 7 provided on the outer periphery of the large diameter portion 4a of the planetary roller 4 has an output shaft cylindrical shape integrally formed with the output shaft 11! A T protrusion protruding from the inner circumferential wall of the opening of 1511a is fitted and the two are connected.

A part of the planetary roller 4, a holding member 5a, etc. are housed and positioned within the opening of the output shaft cylindrical portion 11a, and between the bottom of the output shaft cylindrical portion 11a and the input shaft 1. The bearing 3 is provided. Further, the output shaft 11 is provided within the end of the casing ball, is supported by a T-bearing 13, and protrudes outside from the casing mouth end on the opposite side to the side on which the input shaft 1 is protruded. . 114 is an oil seal provided between the end of the casing ball and the output shaft 11; 15 fl is a bearing movement prevention ring provided between the step 8a of the casing 8 and the bearing 2; 16 is an input shaft 1 and the bearing 2; E-ring 17 is provided on the casing 12, 8.
A planetary roller 4 and the like are installed in the machine, and an oil inlet for the rotating part is provided. 18 is a ring provided between the input shaft 1 and the bearing 3, and 19 is a bearing movement prevention ring.

In addition, in the above, 1. Grooves 6a and 7ai are formed on the outer periphery of the second outer rings 6 and 7, and the casing 8. Output shaft 11
A protrusion Bt is formed to fit into the grooves 6a and 7a, respectively, and a protrusion Bt is formed in the cylindrical opening of the 8° output shaft of the casing. Corresponding grooves may be formed in the second outer rings 6 and 7, and the respective members may be connected to each other through metal fittings.

However, in terms of operation, when a rotational force is applied to the input shaft 1, since the first outer ring 6 is fixed, the theory of the differential planetary gear reducer of type 3 is correct. The second outer ring 7 rotates while being decelerated at a large ratio. According to this, the output shaft 11 that is fitted into and connected to the second outer ring 7 also rotates,
Rotational output on the opposite side on the same axis as input shaft 1@
You can print out the pages.

(Effects of the Invention) According to the present invention, in a differential planetary roller speed reducer, a plurality of planetary rollers are provided with rollers in contact with the outer periphery of a rotationally driven human shaft, and the planetary rollers The opening end of the cylindrical part of the output shaft extending on the opposite side of the human power shaft and substantially on the same axis is connected to the outer periphery of the second outer ring at a constant temperature of 1°. It has the advantage of having a simple structure, a small outer diameter, and being able to take out the entire output via a greatly reduced output shaft that is substantially coaxial with the input shaft.

However, the connection between the second outer ring and the output shaft, and the connection between the first outer ring and the casing are made by a groove on the outer circumference of the outer ring and a protrusion that fits into the groove. Therefore, some deviation in the axial direction can be tolerated.

Furthermore, since it has a small outer diameter and a simple cylindrical shape in appearance, it can also be integrated with the input-side motor.

[Brief explanation of drawings]

The figure shows a cross-sectional view of an embodiment of the invention. 1... Input shaft, 4... Planetary roller,
6, 7... 1st. Second outer ring, 11...-
・Output shaft, 11a... Output shaft cylindrical part

Claims (1)

[Claims] In a differential planetary roller reducer, a plurality of planetary rollers are provided in rolling contact with the outer periphery of an input shaft that is driven to rotate,
Further, an open end of a cylindrical portion of an output shaft extending substantially on the same axis on the opposite side to the input shaft is provided on the outer periphery of the second outer ring of the first and second outer rings provided on the outer periphery of the planetary roller. A differential planetary roller reducer characterized by being connected.