JPH05332413A - Multigear planetary roller type power transmission - Google Patents

Abstract

PURPOSE:To restrain as much vibration of a subject to be driven connected to the input and output shaft of a low-speed planetary roller speed change gear portion as possible during a start or braking, for example, in a multigear planetary roller type power transmission having a structure wherein the planetary roller speed change portions of plural gears are connected in series. CONSTITUTION:A gap between a radially inward collar 7a provided in a housing 7 and the carrier plate 4A of a low-speed planetary roller speed change portion A is sealed and grease G is sealed in that space. The viscosity of the grease G is given to the carrier plate 4A as resistance to rotation. When a subject to be driven is connected to an input and output shaft integrated with the carrier plate 4A, power transmission to the subject to be driven is delayed during a start because of the resistance to rotation given to the input and output shaft 8 and then twisting of the input and output shaft 8 is not likely to occur, so the subject to be driven resists being vibrated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-speed planetary roller type power transmission device.

[0002]

2. Description of the Related Art In a conventional multi-stage planetary roller type power transmission device, as shown in FIG. 4, for example, three stages of planetary roller transmission parts A, B and C are connected in series inside a device housing 7 as described later. It has a unit structure connected to. All the planetary roller transmissions A, B, C are fixed wheels 1 (1A, 1
B, 1C), the sun shaft 2 (2A, 2B, 2C), the planetary roller 3 (3A, 3B, 3C), and the carrier 4 (4A,
4B, 4C).

The fixed wheel 1 is fixed to the housing 7 by adjusting the axial position by the side spacers 5 ... The sun shaft 2 is concentrically arranged on the inner circumference of the fixed ring 1, and the planetary roller 3 is interposed between the sun shaft 2 and the fixed ring 1 in a pressure contact manner. The carrier plate 4 is rotatably supported via (not shown).

The three-stage planetary roller transmissions A, B,
Of C, the carrier plate 4A of the planetary roller transmission unit A at the low speed stage (the left stage in the drawing) is connected to the low speed side input / output shaft 8, and the sun shaft 2A thereof is at the medium speed stage (the central stage in the drawing). Is connected to the carrier plate 4B of the planetary roller speed changer B, and the sun shaft 2B of the medium speed planetary roller speed changer B is connected to the carrier plate 4C of the planetary roller speed changer C in the high speed stage (right side in the drawing). In addition, the sun shaft 2C of the high speed planetary roller transmission C is connected to the high speed side input / output shaft 9
The series connection structure is formed by being integrally formed with. The input / output shafts 8 and 9 are the housing 7 and the lid 6.
Is rotatably supported by rolling bearings 10 and 11. Although not shown in detail, the rolling bearings 10 and 11 are of a sealed type having a built-in sealing device, and
Lubricant is enclosed inside.

The low-speed carrier plate 4A and the input / output shaft 8, the medium-speed carrier plate 4B and the low-speed sun shaft 2A, and the high-speed carrier plate 4C and the medium-speed sun shaft 2B are combined. Each one is called a carrier section. As described above, the carrier part includes a combination of two parts and a part in which they are integrally formed although not shown.

Since such a multi-speed planetary roller type power transmission device can obtain a large gear ratio, it can be used as, for example, a drive system speed reducer of a photoengraving machine as shown in FIG. In the figure, 60 is a document, 61 is an exposure lamp, 62 is a CCD image pickup device, 63 is an arithmetic circuit, and 64 is
Is a laser light source, 65 is a first optical system (beam compressor, acousto-optic modulator, beam expander, cylindrical lens), 66 is a rotating polygon mirror, 67 is a second optical system (toroidal lens, tablet spherical lens), and 68 is The feeding drum 69 is a photosensitive film,
A motor is connected to the feed drum 68 via a speed reducer including the planetary roller type power transmission device described above.

[0007]

By the way, in a situation where a multi-speed planetary roller type power transmission device is used as a speed reducer of a photoengraving machine, when acceleration occurs, for example, at the time of starting or braking, a photograph is taken. The output shaft of the speed reducer (the input / output shaft 8 on the planetary roller transmission unit A side at the low speed stage) may be twisted based on the moment of inertia of the feed drum 68 of the plate making machine. Since the vibration is induced, an angular velocity ripple occurs on the feed drum 68.

If such a rotation fluctuation of the feed drum 68 occurs, the plate-making accuracy of the photoengraving machine is deteriorated. Therefore, conventionally, the rotation fluctuation is attenuated without performing the plate-making processing at the time of starting or braking. I went there later, so I lost a lot of time.

It is possible to reduce the angular velocity ripple of the feed drum 68 by providing an inertia damper, which approximates the inertia moment of the feed drum 68, between the input / output shaft 8 and the feed drum 68. In addition to the need for the above-mentioned countermeasure device, problems such as the need to consider the installation space are pointed out.

The present invention was devised in view of such circumstances, and is connected to the input / output shaft on the planetary roller transmission unit side at the low speed stage when acceleration occurs, for example, at the time of starting or braking. The purpose is to suppress the vibration of the driven body as much as possible.

[0011]

In order to achieve such an object, the present invention provides a multi-stage planetary roller type power transmission device having a structure in which a plurality of planetary roller transmission units are connected in series. In, the following configuration is adopted.

The multi-speed planetary roller type power transmission device of the present invention constitutes a low speed planetary roller speed changer and is a carrier comprising a carrier plate for supporting the planetary rollers and an input / output shaft integrally connected thereto. It is provided with means for imparting rotational resistance to the section.

The rotation resistance imparting means may be composed of a viscous body enclosed in a facing gap between the carrier section and the apparatus housing, and may impart viscous resistance of the viscous body to the carrier section. The rotation resistance applying means may be a braking device provided between the carrier portion and the device housing, and may apply braking resistance by the braking device to the carrier portion.

[0014]

In the above structure, the rotation resistance is imparted to the carrier portion of the planetary roller speed change portion at the low speed stage.
For example, when acceleration occurs such as when starting up or braking, the power transmission from the carrier unit to the external device is delayed. As a result, the carrier portion is less likely to be twisted due to the moment of inertia of the driven body connected to the carrier portion, and the driven body is less likely to vibrate.

[0015]

FIG. 1 shows the first embodiment of the present invention. The multi-stage planetary roller type power transmission device of the illustrated example has a unit structure in which three stages of planetary roller transmission units A, B and C are connected in series inside the housing 7 as will be described later. The basic configuration is the same as that described. That is, each of the planetary roller transmissions A, B, C has a fixed wheel 1 (1A, 1B, 1C) and a sun shaft 2 (2A, 2B, 2).
C), the planetary roller 3 (3A, 3B, 3C) and the carrier plate 4 (4A, 4B, 4C). The fixed ring 1 is fixed to the housing 7 by adjusting the position in the axial direction by the side spacers 5 ... Sun axis 2
Are arranged concentrically on the inner circumference of the fixed ring 1, and the planetary roller 3 is arranged in a pressure contact state between the sun shaft 2 and the fixed ring 1 so as to have a planetary shaft (reference numeral omitted). It is rotatably supported by the carrier plate 4 via the.

The three-stage planetary roller transmissions A, B,
Of C, the carrier plate 4A of the planetary roller transmission unit A at the low speed stage (the left stage in the drawing) is connected to the low speed side input / output shaft 8, and the sun shaft 2A thereof is at the medium speed stage (the central stage in the drawing). Is connected to the carrier plate 4B of the planetary roller speed changer B, and the sun shaft 2B of the medium speed planetary roller speed changer B is connected to the carrier plate 4C of the planetary roller speed changer C in the high speed stage (right side in the drawing). In addition, the sun shaft 2C of the high speed planetary roller transmission C is connected to the high speed side input / output shaft 9
The series connection structure is formed by being integrally formed with.

The characteristic construction of this embodiment is that the facing gap between the radially inward flange 7a provided on the housing 7 and the carrier plate 4A of the planetary roller transmission A at the low speed is a sealed space, and grease G, for example, in this space. It means that silicone grease is enclosed. Specifically, the above-mentioned facing gap is the sealed type rolling bearing 10 for supporting the input / output shaft 8.
The O-ring 12 mounted on the outer peripheral surface of the carrier plate 4A serves as a sealed space to prevent the grease G from flowing out. Further, on the outer peripheral surface of the carrier plate 4A and the inner peripheral surface of the housing 7, there are provided protrusions 13 and 14 which are continuous in the circumferential direction so as to face each other with a minute gap therebetween.
It is designed to increase the enclosed amount of. In this example,
Rotational resistance due to the viscosity of grease G
In addition to being applied to A, rotation resistance is also applied by the elastic contact force of the O-ring 12. Instead of the O-ring 12, an oil seal or the like may be used.

FIG. 2 shows a second embodiment of the present invention.
In this embodiment, the radially inward flange 7 provided on the housing 7
The shape of the facing gap between a and the carrier plate 4A of the planetary roller transmission unit A at the low speed is different from that of the above embodiment. That is, the two cylindrical portions 15a and 15b are concentrically provided on the outer surface of the carrier plate 4A, and the two cylindrical portions 15a and 15b described above are provided on the inner surface of the radially inward flange 7a of the housing 7. Two annular concave grooves 16a and 16b that are stored in a non-contact state are provided. In this embodiment, in addition to the rotational resistance due to the viscosity of the grease G, the rotational resistance due to the stirring of the grease G by the two cylindrical portions 15a and 15b is applied to the carrier plate 4A.

FIG. 3 shows a third embodiment of the present invention.
In this embodiment, the input / output shaft 8 is made of a magnetic material, and the housing 7
The electromagnet 17 is provided on the inner peripheral surface of the radially inward flange 7a provided in the above, and the magnetic fluid 18 is sealed in the facing gap between the inner peripheral surface of the radially inward flange 7a and the outer peripheral surface of the input / output shaft 8. .. That is, a braking device is provided between the radially inward flange 7a of the housing 7 and the input / output shaft 8, and the binding force of the magnetic fluid 18 by the electromagnet 17 causes a rotational resistance to the input / output shaft 8. Is to be given. Since the binding force is variable, the rotation resistance can be adjusted arbitrarily.

If rotational resistance is imparted to the input / output shaft 8 as in each of the above embodiments, a driven body (e.g., corresponding to the feed drum 68 in FIG. 5) is connected to the input / output shaft 8. In this situation, when acceleration occurs, for example, at the time of starting or braking, the power transmission from the input / output shaft 8 to the driven body is delayed and the input / output shaft 8 is less likely to be twisted. The body is less likely to vibrate. It should be noted that even if the driven body vibrates, it is considered to be considerably weaker than in the conventional case, so that the decay time can be short.

In the embodiment shown in FIGS. 1 and 2, it is more effective if the input / output shaft 8 is made of a material having a high longitudinal elastic coefficient such as ceramics so as to increase the torsional rigidity. is there.

[0022]

According to the present invention, it is possible to prevent the carrier portion of the low speed planetary roller transmission portion from being twisted at the time of starting, so that vibration is generated on the side of the driven body connected to this carrier portion. It becomes difficult to do so, and the rotation accuracy of the driven body is improved.

That is, in the present invention, the planetary roller type power transmission device itself is provided with a vibration damping function, so that the conventional countermeasure device is not necessary and the installation space can be omitted. There is.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of a first embodiment of the present invention.

FIG. 2 is a vertical sectional side view of a second embodiment of the present invention.

FIG. 3 is a vertical sectional side view of a third embodiment of the present invention.

FIG. 4 is a vertical cross-sectional side view of a conventional multi-speed planetary roller type power transmission device.

FIG. 5 is a schematic configuration diagram of a general photoengraving machine.

[Explanation of symbols]

 A low speed planetary roller transmission section B medium speed planetary roller transmission section C high speed planetary roller transmission section 4A-4C carrier plate 8 low speed side input / output shaft 9 high speed side input / output shaft G grease

Claims (3)

[Claims] 1. A multi-speed planetary roller type power transmission device having a structure in which a plurality of planetary roller speed change parts are connected in series, wherein a low speed planetary roller speed change part is configured and a planetary roller support is provided. A multi-stage planetary roller type power transmission device comprising means for imparting rotational resistance to a carrier portion comprising a carrier plate for use with and an input / output shaft integrally connected thereto. 2. The rotation resistance imparting means is composed of a viscous body enclosed in a facing gap between the carrier section and the apparatus housing, and imparts the viscous resistance of the viscous body to the carrier section. Multi-speed planetary roller type power transmission device. 3. The rotation resistance applying means comprises a braking device provided between the carrier portion and the device housing,
The multi-speed planetary roller type power transmission device according to claim 1, wherein a braking resistance by the braking device is given to the carrier portion.