JPS5865361A - Roller speed change gear - Google Patents

Abstract

PURPOSE:To provide a roller speed change gear incorporating an encoder for detecting the position of a low speed shaft, which can be simplified in structure and reduced to compact size by combining the speed change gear with the position detecting encoder. CONSTITUTION:Two planetary rollers 2 having difference in level are different in the radius and connected to each other coaxially. A sun roller 1 connected to a high-speed rotary shaft 6 is disposed on the radial inside of one planetary roller, and a fixing ring 4 is mounted on the outside thereof. A recording medium 18 which is a movable portion of a position detecting encoder is fixed on the peripheral surface of a wheel-like structure 8 connected to a ring roller 5 and a low-speed rotary shaft 9 mounted on the radial outside of the other planetary roller 2 having difference in level. An encoder fixing portion 19 is fixed on a outside structure 10. When the medium 18 is rotated, there is a change in quantity of light in the photocell portion of the fixing portion 19 including a light emitting portion and a photocell portion in the structure 10 to be converted to an electrical signal.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a roller transmission having a built-in encoder for detecting the position of a low-speed shaft, compared to a roller transmission in which a speed changer and an encoder are used as independent parts. , provides a roller transmission made of multifunctional parts whose overall volume is significantly reduced.

Hereinafter, the #l construction of the a-la transmission according to the present invention will be explained in detail. Figures 13 and 2 show embodiments of a roller transmission according to the present invention, showing cross sections along the center IIi and perpendicular to the center line #Icfl.

#C5PVh in the figure is the main part of the roller transmission according to this invention! ! - component a, radius RID connected to high-speed rotating shaft 6;
Thick AIa') Ie-SofLKlli Touching radius Rm
A plurality of steel high-speed side planetary rollers 2r and tL#Cff1
3. The ring is fixed to the outside SII structure lO. Also coaxial with the high speed side planetary roller 2'#C! 1WR7j5 radius R low speed Biyu Jl roller 21 and low j! This is a ring roller 5 connected to a rotating shaft 9. This is a portion of the stepped planetary roller 2, which is formed by integrating the aforementioned high-speed planetary roller 2' and low-speed planetary O-ra 21a. Note that there is a freely rotating sun roller 4 on the inside of the low-speed side planetary roller 21 group to obtain the pressure fold force #Cα. In addition, the planetary roller 2 with one step difference is held in the cage 7 at an accurate position *#C on the circumference.

Also, during power transmission, the stepped planetary roller 2 maintains its axial parallelism against the stress that causes it to tilt away from the axial direction. This is to make #.

The above configuration #Ch vs. the roller change a according to the present invention
The gear ratio T of the machine is t9%. By changing the values of this Q-Ra change j1 machine σHa and 83, it is possible to obtain tens to hundreds of gear ratios, and i is a normal multi-stage planetary roller transmission! JIF has the advantage of being smaller and lighter.

Next, the charm of the encoder for detecting one position will be explained. In order to control the position of the low-speed rotary shaft 90, various encoders are used to detect the position, and the transmission and encoder a are always used as independent components. Angle l detection type encoder a extremely low R @ rolling wheel A periodically changing magnetic signal pattern is recorded, and when the movable part rotates, the fixed m't'' movement of the signal pattern causes a certain optical vhrx magnetic film to receive the signal in sequence. 9. It has the function of converting it into electrical signal 4Ij and supplying the position information of the low-speed rotating shaft to the control amplifier that supplies power to the control amplifier.The movable gα of this encoder is required*1
In order to obtain a resolution of
9. Discipline the signal pattern with %fh. Therefore,
The overall shape α of the encoder is usually in the shape of a flat disk.

The shape of the wheel-like structure 8 of the roller transmission according to the present invention is a disk shape, and the signal pattern is recorded thereon, or a recording medium recording the rt% signal pattern is attached thereto, and an external fR It is easy to install the above-mentioned fixed part of the 10#C encoder, and because of the structure, it is easier to install the fixed part of the 10#C encoder. On the other hand, as shown in Fig. 3, an embodiment of the combination of the roller variable am and the encoder for position detection according to the invention of C.
An example using a light transmission type encoder will be described. A recording medium (8) which is coated with ink on the same plane in the radial direction of the single-ring structure (80) and has a light-transmitting signal pattern recorded thereon is attached, and an encoder (8) is attached to the outer structure (10) as a light-emitting part and a light-receiving part. Add 1 fixed 8119 to 4!9 and 9. As the recording medium 18 rotates, the amount of light passing through the signal pattern changes, which is converted into an electrical signal by the light receiving section and emitted.

In addition, 1i41Q [h9 in an example using an encoder that uses a magnetic head to generate a magnetic signal pattern,
Wheel-shaped structure 80 #Cal & coercive force ferromagnetic material 2 on the circumferential surface
0 by mechanical contact or plating, its surface is finished extremely smooth, and a magnetic signal pattern is recorded thereon.
A magnetic head 21 is provided on the outside S* structure 10, and the magnetic head 26-l reads changes in the magnetic signal pattern due to the rotation of the high coercive force ferromagnetic material 20, converts it into an electric signal, and transmits it. Let's put it out #C7
! I'm here.

Roughly speaking, this shows an example using a 11158tX magnetic reluctance type encoder.Ha, a square gear-shaped synchronous unevenness is formed on the 80 yen m1 surface of the wheel-like structure so that the direction of the teeth is parallel to the axial direction. 22 is provided, and a magnetic head 23 for reading changes in magnetic reluctance is provided on the outer 5BIl structure 10 facing this fL.

The change in magnetic reluctance due to the signal pattern due to the a rotation of the periodic unevenness 22 is detected by the magnetic head 22, and converted into an electric signal lIc. It started to come out.

In addition, the roller transmission IIx uses a lubricating oil.

114111,! [Even if there is a stile or lubrication oil in the implementation shown in 5@, it is not functionally an interlayer stile. The embodiment shown in Figure 39 can be used universally with a roller transmission #Cα that does not require a frame or adjusting oil, but if the jII lubricating oil is required, there is a problem of contamination of the recording medium 18t) by the grinding lubricating oil.

As described above in detail, the roller transmission II according to the present invention has two stepped planetary O-rollers having two different radii and connected coaxially, and a plurality of stepped planets provided on one circumference. A sun roller i is provided with a high-speed rotating shaft KWI on the inside radius of one of the planetary roller groups.

A τ ring is fixed to the outside @rc outside Is structure of the same planetary a-ra group, and the outside of the other radius of this planetary roller group 1III
A C ring roller is provided, and on the circumferential surface of the wheel-like structure connected to the ring roller and the low-speed rotating shaft #C, a certain vh is a signal pattern I, which is the movable part of the encoder for position detection, on the radial plane. ! It is made by attaching a medium on which a signal pattern is recorded or by attaching a fixed part of the encoder used in combination with the signal pattern to an external structure.
This is convenient when performing one-position closed loop control by combining a roller transmission with a variable speed ratio and an encoder for position detection. Compact and lightweight roller transmission with simple structure
can be obtained.

[Brief explanation of drawings]

The attached @shi also shows an embodiment of this invention, and the upper half of the IKl@I frame i! 1llFr side view, the left part is the Moum line in Figure 1 in Figure 2, and the right part is the cross section S and w along the line 121B-B.
S- is a light transmission type 1Fli disconnection m using 2-da.
aa, summary 4-1 of the method of reading the magnetic signal pattern with a magnetic head! It is a partial sectional view and a *g* direction view of the coil 5@α magnetic relaxation method. l... Sun roller, 2... Planetary roller with step, 3...
... (Support) Fixed spring ring, 4... Freely rotating sun roller. 5... Ring roller, 6... Speed rotation axis. 7... Holder, 8... Wheel-shaped body, 9... Low speed rotating shaft, lO... External structure, 18... 1 medium,
19...Encoder fixing part. 20... High coercive force strong m injection body, 21... Magnetic head. 22... Periodic unevenness, 23... Magnetic head. Utility model registration applicant Shin Kuzuno (1 representative from Mitsubishi Electric Corporation) - (1 other person) 9- Figure 4 - ? 2 I

Claims (4)

[Claims] (1) It has two stepped planetary rollers that are coaxially connected with different radii and provided multiple times on one circumference, and is connected to a high-speed rotating shaft on the inside radius of one of the planetary roller groups. A sun roller is fixed to an external structure on the outside of the same planetary roller group, and a ring is installed on the outside of the other radius of the planetary roller group. The signal pattern, which is the movable part of the encoder for position detection, is directly recorded on the circumferential surface or the radial plane of the wheel-like structure to be detected, or the signal pattern is distributed on the recording medium. A roller transmission characterized by a differential planetary system in which a fixed part of an encoder used in combination with the above signal pattern is attached to the structure. (2) Mark a light-transmissive signal pattern on the radial plane of the wheel-shaped structure 1. Add Rlg to the recorded recording medium,
A roller transmission according to claim 1, which uses a light transmission type encoder. (3) A high coercive force ferromagnetic material with a magnetic signal pattern recorded on the circumferential surface of the wheel-shaped structure is attached, and a magnetic encoder is used. The roller transmission according to claim 1. (4) A gear-shaped recess on the circumferential surface of the wheel-shaped structure. By providing a protrusion and consolidating magnetic resistance, the signal can be increased to 4! ? , a transmission according to claim 1 (D(17)) which uses a magnetic reluctance type converter.