JPH03173331A - Rotary shaft drive - Google Patents

Abstract

PURPOSE:To bond a rotary shaft rigidly to an outer frame by making a groove in at least one bonding face of a bearing and the outer frame to be bonded, when the bearing and the outer frame are bonded each other, and then injecting adhesive into the groove. CONSTITUTION:A rotary shaft 1 is bonded with a rotary scale board 8 constituting one element of a rotary encoder. Bearings 4 are arranged, above and below the rotary shaft 1, in an outer frame 2 and an outer frame cover 3. A rotor 6 comprising a rear earth magnet is secured coaxially with the rotary shaft 1. A groove section 10 for storing adhesive is made in the outer frame 2. The groove section 10 is sufficiently filled with adhesive in order to bond the bearings 4 and the outer frame 2 rigidly. By such arrangement, rotational accuracy of the rotary shaft is improved.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a rotating shaft drive device, and in particular, the present invention relates to a rotary shaft drive device, and more particularly, to a rotary shaft drive device, in which a rotary bearing that rotatably supports an erroneously rotating shaft with respect to an outer frame that houses the rotary shaft is provided with an adhesive. The present invention relates to a rotary shaft drive device suitable for, for example, a rotary enhancer shade, which is firmly adhesively fixed to improve rotation accuracy.

(Prior Art) Encoder motors have traditionally been widely used in machine tools and semiconductor manufacturing equipment, where a motor is used as an actuator and an encoder is used to detect rotational speed, and these are housed in a single housing and integrated. In recent years, in such devices, there has been a demand for a rotating shaft drive device that has high accuracy in rotational speed and a detection means that can detect rotational speed with high accuracy. Among these, for example, in JP-A No. 62-12814 and JP-A No. 62-163920, Mjl misrotated axis gratings are connected, and when a light beam is incident on the diffraction grating, the light beam is diffracted by the misrotated grating. Interference fringes based on diffracted light of a predetermined order are detected by the detection stage P, and a rotary encoder from the detection stage (No. 6) is used to improve the detection precision (detection resolution) of the rotation axis. It is being proposed.

Generally, when a rotating shaft is rotated by a motor, the rotating bearing is fixed with adhesive to a part of the outer frame (housing) that houses the rotating shaft in order to improve the rotation accuracy of the rotating shaft. There is. The rotary shaft is rotated via the 101 rotation bearing.

(Problems to be Solved by the Invention) Generally, in order to improve the rotation accuracy of the rotating shaft, the fit-in gap between the rotating bearing and the outer frame is set to be as narrow as possible.

For this reason, the rotation bearing and the outer frame are bonded with adhesive [,1
, I, the gap l;j may not be sufficiently filled with the adhesive, resulting in a problem in that the adhesive identification strength is weakened and, for example, high-speed simultaneous rotation becomes difficult.

In the present invention, the rotary bearing and the outer frame are bonded and circumferentially bonded, and the rotary bearing and the outer frame are firmly connected and fixed by properly constructing the adhesive surface between the rotary bearing and the outer frame. [1] It is an object of the present invention to provide a rotary shaft drive device fr that can improve the rotational precision of Jt by increasing the high-speed rotation to a capacity μ.

(1st step to solve the problem) The rotating shaft drive device of the present invention adds rotational force to a part of the rotating shaft.
In a rotating shaft drive device, a rotor is provided, and a stator is provided on a part of an outer frame that houses the rotor, and a stator is provided opposite to the rotor. When the rotary bearing and the outer frame are adhesively fixed, a groove is formed on at least one of the adhesive surfaces of the rotary bearing and the outer frame, and the adhesive is injected into the groove. It is a feature.

(Embodiment) FIG. 1 is a schematic cross-sectional view of an embodiment in which the rotary shaft drive device of the present invention is applied to a part of a rotary encoder.

In the figure, l denotes a rotating shaft, and a rotating scale 8 constituting a -:JP element of a lorry encoder, which will be described later, is fixed to one end. 2 is an outer frame (housing), 3 is an outer frame lid, and 4 is a rotation bearing, which are provided on one side and below the rotation axis l. 5 is a rotor using rare magnets,
It is fixed to a part of the rotating shaft F, which is the same as the rotating shaft L. 6 is a stator and 4 is attached to the base inside the outer frame 2! It is placed.

7a is a light source j■, 7b that constitutes a rotary encoder
is a photodetector that constitutes a rotary encoder. 8
is a temporary rotating scale, which is fixed to one end of the rotating shaft, and a radial diffraction grating r is provided on its surface.

A stator spacer 9 supports the stator 6. 1
Reference numeral 0 denotes a groove, and an adhesive surface with the rotation bearing 4 is provided on the inner circumference of the outer frame 2. An adhesive is injected into this groove 10 as described later, and the rotation bearing is attached using the adhesive. : The cover 4 and the outer frame 2 are firmly adhesively fixed.

Rotation axis l by rotary encoder in this example
Regarding the method for detecting the rotational speed of
2 The method proposed in Publication No. 163920 is applied i
iJ Noh.

That is, in this embodiment, a coherent light beam is emitted from a light source section 7a having a laser diode, and the light beam is incident on a diffraction grating of a rotating scale plate 8 connected to a rotating shaft. Then, the two diffracted lights of a predetermined order diffracted by the diffraction grating are caused to interfere with each other, and the number of brightness and darkness of the interference fringes is detected by the light detection unit 7b, thereby determining the rotation angle and rotation speed of the rotary scale plate 8. etc. are being detected.

In the rotary shaft drive device of this embodiment, the rotational accuracy of the rotary shaft 1 is mainly determined by the accuracy of attachment of the outer frame 2 and the rotary bearing 4, and the rotational accuracy of the rotary bearing 4.

Generally, in order to improve the detection accuracy of a rotary encoder, it is necessary to suppress the vibration of the rotary scale plate 8 to a minute level. For this reason, in this embodiment, the dimensional tolerances between the rotating shaft 1 and the rotating bearing 4, and between the rotating bearing 4 and the outer frame 2 are increased to, for example, 5 μm or more.

Then, the rotating shaft 1 and the rotating bearing 4 are brought into contact with each other, and the rotating bearing 4 and the outer frame 2 are attached using adhesive injected into the groove provided in a part of the outer frame 2 as described above. We are working to strengthen this by doing so.

In this embodiment, when assembling the rotary shaft drive device, there are bonding points A and I3 between the rotary shaft l and the rotary bearing 4, and a bonding surface C between the rotary bearing 4 and the outer frame 2. Generally, the gaps between these adhesive points are very narrow, making it difficult to fill the adhesive sufficiently.

Of these, the adhesive points A and B between the rotating shaft l and the rotating bearing 4 can be relatively easily filled with adhesive by squeezing the parts together well. However, since it is difficult to properly squeeze the parts together at the contact n[l1liC between the rotary bearing 4 and the outer frame 2, it is difficult to fill the adhesive sufficiently.

Therefore, in this embodiment, a groove lO1 as shown in FIG. 2 is provided on the adhesive surface C of the outer frame 2, for example, a groove 10 having a depth of 0.1 mm and a width of 2 mm for collecting adhesive. Then, the groove lO of the outer frame 2 is sufficiently filled with adhesive, and the rotary bearing 4 and the outer frame 2 are firmly bonded together through the adhesive in the groove 10.

This is intended to improve the rotation accuracy of the rotating shaft 1.

11″: I As a groove provided in the outer frame in this embodiment.

For example, a plurality of narrow grooves as shown in FIG. 3 may be provided.

Also, instead of the groove being on the outer frame, the rotary bearing may be provided on the side.
Alternatively, it may be provided on both sides.

(Effects of the Invention) According to the present invention, when the rotary shaft is rotatably supported with respect to the outer frame, and the outer frame is adhesively fixed to the rotary shaft, as described in +iii, A rotary shaft that is provided with a groove on at least one of the bonding surfaces, and that can be firmly adhesively fixed to both surfaces by using an adhesive injected into the groove, thereby improving the rotation accuracy of one rotational axis. It is possible to achieve n.

[Brief explanation of the drawing]

FIG. 1 is a schematic view of a main part of an embodiment when the present invention is applied to a part of a rotary encoder, FIG. 2 is an explanatory diagram of a groove 10 provided in a part of the outer frame 2 of FIG. The figure is a schematic diagram of another solid foam example of the outer frame 2 of FIG. 1. In the figure, 1 is the rotation axis, 2 is the outer frame, 3 is the outer frame i, 4:1 rotation bearing, 5 is the rotor, 6 is the stator, 7a (light source part, 7b is the light detection part, 8 is the rotation scale temporary) , 10 is the groove part,
It is.

Claims (1)

[Claims] (1) Provide a rotor that applies rotational force to a part of the rotating shaft,
In a rotary shaft drive device in which a stator is provided in a part of an outer frame that houses the rotor and faces the rotor, a rotary bearing provided in a part of the rotary shaft for rotationally supporting the rotary shaft and the outer frame are provided. A rotating shaft characterized by forming a groove in at least one of the bonding surfaces of the rotation bearing and the outer frame, and fixing the rotating shaft by adhesive using an adhesive injected into the groove. Drive device.