JPH04102060U - rotation detector - Google Patents

Abstract

(57) [Summary] [Objective] The present invention relates to a rotation detector, and is particularly characterized in that heat transferred to a rotating shaft is radiated to the outside by a heat sink provided on the rotating shaft. [Structure] A rotation detection unit provided on a rotary shaft rotatably provided on the base, an outside air contact shaft portion formed at the end of the rotary shaft and in contact with outside air, and a heat sink provided on the outside air contact shaft portion. The configuration includes the following.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a rotation detector, and in particular, the present invention relates to a rotation detector, and in particular, the present invention relates to a rotation detector. This invention relates to a new improvement for dissipating heat to the outside using a heat dissipation plate.

0002

[Conventional technology]

There are various types of rotation detectors that have been used in the past, but the most representative one is Regarding the specific one, it is disclosed in Japanese Utility Model Application Publication No. 1-173625 shown in Figure 2. Some configurations can be mentioned. That is, what is indicated by the reference numeral 1 in FIG. 2 is a base, and this base 1 has A rotating shaft 3 is rotatably provided via a bearing 2, and a large number of A rotating disk 4 having a rotating slit (not shown) is integrally attached thereto. A fixed slit (not shown) is provided on one side of the rotary disk 4 opposite to the rotating disk 4. A fixed slit plate 5 is provided below the fixed slit plate 5. A light receiving element 6 is provided facing toward the front. On the other side of the rotating disk 4, there is a circuit board having an electronic circuit section 7 opposite thereto. 8 is fixedly arranged by a fixing means (not shown), and on the lower surface of this circuit board 8, A light emitting element 9 is provided at a position corresponding to the fixed slit plate 5 and the light receiving element 6. It is being A case body 12 to which a connection wire 10 is attached via a bush 11 is attached to the base 1. The connection line 10 is fitted with a power supply line 13 and a signal output line. 14 are built-in. Therefore, the above-mentioned By connecting the rotating shaft 3, the light receiving element 6 changes as the rotating disk 4 rotates. Based on the output signal obtained from the The rotation speed of the motor can be detected.

0003

[Problem that the idea aims to solve] Conventional rotation detectors were configured as described above, which caused the following problems. was there. In other words, when the rotating shaft is attached to a heat-generating rotating body such as a motor, the motor's The heat transferred through the rotating shaft is transferred to the internal detection part, the rotating disk, and the electronic circuit part. As a result, these rotating disks and electronic circuits are subject to heat damage, resulting in performance deterioration. It became. Also, since the rotation detector is subject to heat deterioration, the motor should not be operated at full power. Therefore, it was difficult to use the full performance of the motor.

0004 This invention was made to solve the above problems, and in particular, Rotation detection in which the heat transferred to the rotating shaft is radiated to the outside by a heat sink installed on the rotating shaft. The purpose is to provide equipment.

[0005]

[Means to solve the problem]

The rotation detector according to the present invention includes a rotating shaft rotatably provided on a base, and a rotating shaft rotatably provided on a base. A rotation detecting section provided on the shaft and an outside air contacting the outside air formed at the end of the rotating shaft. This configuration includes a contact shaft portion and a heat sink provided on the outside air contact shaft portion.

[0006] More specifically, the rotating shaft is a hollow shaft.

[0007] More specifically, the base has a casing for covering the rotation detection section, and the base has a casing for covering the rotation detection section, and The heat sink is located outside the casing.

[0008]

[Effect]

In the rotation detector according to the present invention, a heat sink is provided at the end of the rotating shaft. Therefore, the heat transferred from the motor etc. connected to the rotating shaft is transferred to the outside air via the heat sink. It is possible to prevent the performance deterioration of the rotation detector by replacing it.

[0009]

【Example】 Hereinafter, preferred embodiments of the rotation detector according to the present invention will be explained in detail along with the drawings. do. Note that parts that are the same or equivalent to those of the conventional example will be described using the same reference numerals.

0010 In FIG. 1, the reference numeral 1 is a base, and the one provided on this base 1 is A hollow shaft-shaped rotating shaft 3 is rotatably provided in the pair of bearings 2 .

[0011] The rotating shaft 3 is provided with a rotating disk 4 for configuring a rotation detecting section. A circuit board 8 having an electronic circuit section 7 and a light emitting section 9 is located adjacent to the rotating disk 4. It is held on the base 1 via a holding means (not shown).

0012 A light receiving section 6 is provided on the base 1 in correspondence with the light emitting section 9. The rotating disk 4, the electronic circuit section 7, etc. are mounted on the casing 12 attached to the base 1. kept isolated from the outside air.

[0013] The rotating shaft 3 penetrates and protrudes outward from the opening 12a of the casing 12. An outside air contact shaft portion 3a is formed at a position in contact with the outside air, and this outside air contact shaft portion 3 A disk-shaped heat sink 20 is provided at a.

[0014] The heat sink 20 is made of a material with high heat conduction and heat exchange efficiency, such as aluminum. In the center thereof, there is a through hole 20 that communicates with the hollow hole 3b of the rotating shaft 3. a is formed.

[0015] In the above state, insert the motor shaft 22 of the motor 21 into the hollow hole 3b of the rotating shaft 3. When the motor 21 is turned on and the motor 21 is driven, the heat generated by the motor 21 is circulated through the motor shaft 22. The heat is transmitted to the rotating shaft 3, but the heat is radiated through the heat sink 20 that comes into contact with the outside air, so the rotation It is possible to prevent the temperature of the rotating disc 4, the electronic circuit section 7, etc. from increasing.

[0016] In addition, in the above-mentioned embodiment, the case of an optical encoder was described, but For example, in the case of a well-known resolver or synchro winding, the rotating shaft 3 It is also mentioned that this can be applied not only to hollow shapes but also to ordinary cylindrical shapes. There is no need to worry about it.

[0017]

[Effect of the idea]

The rotation detector according to the present invention is configured as described above, so that it transmits information to the rotating shaft. The heat can be exchanged with the outside air via the heat sink, reducing the performance of the This allows full power rotation of motors, etc., to be prevented.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a rotation detector according to the present invention.

FIG. 2 is a sectional view showing a conventional rotation detector.

[Explanation of symbols]

1 Base 3 Rotating axis 3a Outside air contact shaft 4 Rotation detection section 12 Casing 20 Heat sink

Claims (3)

[Scope of utility model registration request] [Claim 1] A rotating shaft rotatably provided on the base (1)
(3), a rotation detection section (4) provided on the rotation shaft (3),
The rotary shaft (3) includes an outside air contact shaft portion (3a) formed at an end that contacts the outside air, and a heat sink (20) provided on the outside air contact shaft portion (3a). 20) A rotation detector characterized in that the rotation detector is configured to radiate heat from the rotating shaft (3). 2. The rotation detector according to claim 1, wherein the rotation shaft (3) is a hollow shaft. 3. The base (1) has a casing (12) for covering the rotation detection section (4), and the heat sink (20) is located outside the casing (12). The rotation detector according to claim 1 or 2, characterized in that: