JPH067301Y2 - Magnetic encoder - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a magnetic encoder, and more particularly to improvement of splash proof and magnetic shield from the outside.

[Conventional technology]

FIG. 2 is a cross-sectional view showing the structure of the splashproof and magnetic shield of a conventional magnetic encoder. In the figure, (1) is a motor, (2) is a flange fixed to this motor (1), and (3) )
Is a cover fixed to this flange (2) and made of aluminum die-cast material, (4) is the rotary shaft from the motor, (5) is the rotary drum attached to this rotary shaft (4), and (6) is the flange (2 ) Attached to the rotary drum (5) facing the magnetic sensor, (7) a magnetic shield disk attached to the flange (2), (8) a magnetic shield attached to the flange (2) It is a cover.

Next, the operation will be described. The magnetic sensor (6) reads the magnetic signal magnetized on the circumference of the rotary drum (5) that rotates together with the rotary shaft (4). At this time the magnetic shield cover
(8) and the magnetic shield disc (7) block the magnetic field from the outside to prevent the reading error of the magnetic sensor. Further, the cover (3) prevents water and foreign matter from entering from the outside.

[Problems to be solved by the invention]

Since the conventional magnetic encoder is configured as described above, there are problems that the number of parts is large and the assembling workability is poor, and that the external structure is large due to the double structure.

The present invention has been made in order to solve the above problems, and an object thereof is to obtain a magnetic encoder which can be reduced in size and weight, can be improved in assembling workability, and can be splash-proof and magnetically shielded.

[Means for solving problems]

A magnetic encoder according to the present invention has a through hole through which a rotary shaft penetrates, a flange on which a magnetic sensor is mounted on a side wall, and a portion near the rotary drum and the magnetic sensor which is mounted on the flange. A cover for covering with the flange is provided, and the cover is composed of a non-magnetic material member and a magnetic material member integrally formed inside thereof.

[Action]

A magnetic encoder according to the present invention has a through hole through which a rotary shaft penetrates, a flange on which a magnetic sensor is mounted on a side wall, and a portion near the rotary drum and the magnetic sensor which is mounted on the flange. A cover for covering with the flange is provided, and the cover is composed of a non-magnetic material member and a magnetic material member integrally formed inside the non-magnetic material member, thereby providing smearing and magnetic shielding.

[Example of device]

An embodiment of the present invention will be described below with reference to the drawings. First
In the figure, (1) is a motor, (2) is a flange made of aluminum material fixed to this motor (1), (3) is a cover fixed to this flange (2), (4) is a rotating shaft, (5) is a rotating drum attached to this rotating shaft (4), (6) is a magnetic sensor attached to a flange (2), (9) is a flange
A flange core metal made of a steel material integrated with (2) and a cover metal core 10 made of a steel material integrated with the cover (3) made of an aluminum material. The cover (3) is screwed and fixed to the flange (2) serving as a cover mounting member, and the rotary drum (5) and the magnetic sensor (6) are covered with the flange (2) and the cover (3).

Next, the operation will be described. The magnetic sensor (6) reads the magnetic signal magnetized on the circumference of the rotary drum (5) that rotates together with the rotary shaft (4). At this time, the cover (3) and the flange (2) block the magnetic field from the outside, and prevent the reading error of the magnetic sensor (6). Further, the cover (3) prevents intrusion of moisture and foreign matter from the outside.

[Effect of device]

As described above, according to the present invention, since the cover and the magnetic shield cover and the flange and the magnetic shield disk are integrated and the number of these parts is reduced, the device can be made inexpensive, and the assemblability can be improved and the protection can be prevented. A splash and magnetic shield are also available.

[Brief description of drawings]

FIG. 1 is a sectional view showing a structure of a magnetic shield and a magnetic shield of a magnetic encoder according to an embodiment of the present invention, and FIG. 2 is a sectional view showing a structure of a conventional magnetic encoder. . In the figure, (2) is a flange, (3) is a cover, (5) is a rotating drum, and (6) is a magnetic sensor. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] 1. A magnetizing layer is provided on the circumference of the circumference,
A magnetic encoder having a rotary drum fixed to a rotary shaft and rotating together with the rotary shaft, and a magnetic encoder arranged facing the rotary drum and having a magnetic sensor for detecting magnetism, having a through hole through which the rotary shaft passes. A flange on which the magnetic sensor is mounted on the side wall, and a cover which is mounted on the flange and covers the vicinity of the rotary drum and the magnetic sensor together with the flange, the non-magnetic material member and the inside thereof. A magnetic encoder comprising a magnetic material member integrally molded with the magnetic encoder.