JPS62147156A - Planetary roller speed reducer - Google Patents

Abstract

PURPOSE:To prevent backlash from occurring, by setting up plural pieces of a hollow planetary roller in and around a sun shaft, and coupling an output flange with a positing-cum-output rotation transmitting pin being concentrically inscribed to these rollers and using an oil-impregnated metal. CONSTITUTION:A planetary roller speed reducer is constituted around a sun shaft 1 to be rotated and driven by plural, for example, four planetary rollers 2 and a fixed ring 5 to be circumscribed to these rollers. A pin 3 consisting of an oil-impregnated metal for positioning around the sun shaft 1 and output of revolving motion is inserted in this hollow planetary roller 2 in a touch of loose fit, and this pin 3 is coupled with an output flange 4. Thus, positioning for the hollow planetary roller 2 is accurately performed with this pin 3 whereby backlash is preventable. And, since oil discharge of the oil-impregnated metal becomes much in proportion to the pressure value, favorable lubrication is always performable without using a bearing or the like and, what is more, the number of parts items is reducible.

Description

[Detailed description of the invention] (Technical field 9 The present invention relates to a planetary roller speed reducer.

(Background technology) Converts the rotation of the sun axis into rotation and revolution motion of planetary rollers,
The following two methods are known for positioning the planetary rollers and transmitting the revolution output in the planetary rollers that output the orbital motion of IJ. The first method is to install a bearing inside the hollow roller. 1l
This is a method of inserting an output bin into the 1/1 receiver and connecting this bin to the 7 output lunges (Japanese Patent Publication No. 51-25539).

The second method is to provide a retainer that holds the entire planetary roller,
The purpose is to find out how the retainer L comes out (Japanese Patent Publication No. 31461/1983).

However, although the first method has good accuracy in positioning the planetary roller in the circumferential direction, it has the disadvantage that it requires a large number of parts. On the other hand, the second method has the disadvantage that the number of parts is small, but the positioning accuracy is low.

(Objectives of the Invention) The present invention has been proposed in view of the above points, and its objectives are to reduce the number of component points a without reducing the positioning accuracy of the planetary rollers, and to reduce the pressure applied by the planetary rollers. It is an object of the present invention to provide a planetary roller speed reducer whose lubrication effect can be changed depending on force.

(a) is an axial cross-sectional view, and (b) is a cross-sectional view perpendicular to the axis.

As shown in the configuration diagram in Figure 1, the sun is driven in rotation! I
11] A planetary roller deceleration comprising a plurality of planetary rollers 2 (four in this case) arranged at equal intervals around the planetary roller 1 and a fixed ring 5 coaxial with the sun axis 1 and circumscribing the planetary rollers 2. In the machine, the sun axis 1 of the hollow planetary roller 2
A bottle 3 made of oil-impregnated metal is inserted into the hollow planetary roller 2 with a slight clearance fit for positioning the surroundings and outputting rotation interlocking, and this bottle 3 is attached to the output 7 flange 4. 6
indicates the casing.

Here, at the contact portion between the planetary roller 2 and the bin 3, a gap occurs because the planetary roller 2 rotates and revolves, whereas the bin 3 only revolves.

For this reason, the contact parts must be lubricated, but now the bottle 3
Since oil-impregnated metal is used, it has a lubricating effect and can prevent wear.

In addition, in the planetary roller speed reducer, since power is transmitted between the fixed ring 5 and the planetary roller 2 and between the planetary roller 2 and the sun shaft by a traction drive, it is necessary to apply a pressure force. Normally, a method such as shrink fitting is used to apply this pressure contact force, but in this case, the hollow planetary roller 2 is compressed,
Pressure is also generated between the bottle 3 and the bottle 3. At this time, it is necessary to increase the lubrication effect even more than when no pressure is applied. Therefore, let us consider the contact between the planetary roller 2 and the bin 3 under pressure.

The planetary roller 2 is compressed and the contact pressure between it and the bin 3 increases. The bottle 3 will be compressed, and the lubricating oil film between them will become thinner, and the lubrication effect will deteriorate. However, as the contact pressure of oil-impregnated metals increases, the amount of impregnated oil discharged increases, so even if the pressure increases, the lubricating effect can be maintained in a good state.

(Effects of the Invention) As described above, according to the uninvented planetary roller reducer, there is a sun shaft that is rotatably driven, and a plurality of fasteners arranged at intervals around the sun shaft. A flyer constructed to include a hollow planetary roller, a positioning Kawahara output rotation transmission pin coaxially inscribed in the hollow planetary roller and made of oil-impregnated metal, and an output 7 lange coupled to the bottle. Positioning of the hollow planetary roller 2 can be carried out smoothly with all the bins 3 (bundling can be prevented)0 (0) Since oil-impregnated metal is used for the bin 3, a bearing or the like should be used between the bin 3 and the hollow planetary roller 2. The number of parts can be reduced because it can be lubricated without any need for lubrication.

Q.) The amount of oil discharged from oil-containing metals increases in proportion to the pressure value, so a good lubrication effect can always be obtained regardless of the size of the contact pressure! do.

You can get the effect of a temple.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a planetary roller according to the present invention, and FIG. 2 is a diagram showing the structure of a planetary roller according to the invention.

Claims (1)

[Claims] A rotationally driven sun shaft, a plurality of hollow planetary rollers disposed at intervals around the sun shaft, and a positioning roller made of oil-impregnated metal and coaxially inscribed in the hollow planetary roller. A planetary roller reduction gear comprising an output rotation transmission pin and an output flange coupled to the pin.