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Magnetic encoder, and production method therefor

A technology of a magnetic encoder and a manufacturing method, applied in the field of magnetic encoders, can solve problems such as shortening the takt time, and achieve the effects of low price, shortened takt time, and high reliability

Inactive Publication Date: 2016-05-04
NSK LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there is a limit to shortening the tact time, including the process of keeping the embedded molded body in the mold for a certain period of time in order to carry out the bonding reaction in the mold.

Method used

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  • Magnetic encoder, and production method therefor
  • Magnetic encoder, and production method therefor
  • Magnetic encoder, and production method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] [Examples 1 to 5, Comparative Example 1]

[0082] (production of test body)

[0083] First, polyamide 12, 30% by mass of a soft component (polyamide-based thermoplastic elastomer) and 0.5% by mass of a heat stabilizer (N,N'- Diphenyl-p-phenylenediamine), mixed to obtain a resin composition. Mixing was carried out at 250°C for 5 minutes. Then, the resin composition is pelletized by a usual method.

[0084] Next, ferrite magnetic powder was put into the pellets of the resin composition, and extruded after kneading at 250° C. for 10 minutes using a twin-screw extruder. It should be noted that the magnetic powder is 60% by volume of the plastic magnet material. Then, the extruded magnetic powder-containing resin composition is pelletized.

[0085] In addition, prepare a stainless steel flinger with an L-shaped cross section (refer to figure 2 ), use sandblasting to roughen the bonding surface.

[0086] Then, the adhesive shown in Table 1 was applied to the bonding s...

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PUM

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Abstract

The invention provides a magnetic encoder, and a production method therefore. The magnetic encoder is produced by: applying, during insert moulding, an adhesive agent in a hardened state or a cured state so as to not be washed away from a fixed member by a molten substance of a plastic magnet material, said adhesive agent being capable of having a coating state thereof controlled by way of heating; removing from a die, after completion of the insertion moulding, a moulded article for each slinger; and heating said adhesive agent, after completion of injection moulding, to induce adhesion and establish an adhesive bond between a magnet part and the fixed member.

Description

technical field [0001] The present invention relates to a method of manufacturing a magnetic encoder used to detect the rotational speed of a rotating body, and to a magnetic encoder manufactured by the method. Background technique [0002] Conventionally, among magnetic encoders used in vehicle bearings, there are rubber magnet encoders using magnetic rubber mixed with magnetic powder in rubber, and plastic magnets made of plastic magnets mixed with magnetic powder in plastic. However, compared with the two, plastic magnets are easier to injection mold (magnetic field molding) in the state where a magnetic field is applied. From this, it can be seen that compared with the case of using rubber magnets with the same amount of magnetic powder, not only can A magnetic encoder with higher output and excellent magnetic properties can be obtained. Moreover, plastic magnet encoders are also superior in environmental reliability (thermal oxidation resistance, water resistance, oil r...

Claims

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Application Information

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IPC IPC(8): G01D5/12B29C45/14B29C45/17
CPCG01D5/24433B29C45/0013B29C45/14311
Inventor 村上豪矢部俊一内山贵彦
Owner NSK LTD
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