Pulsar Ring of Magnetic Rotary Encoder

• US 20090096444A1
• Filed: 03/30/2006
• Published: 04/16/2009
• Est. Priority Date: 04/01/2005
• Status: Active Grant

• Current Assignee: NOK Corporation
• Original Assignee: NOK Corporation
• Inventors: Kobayashi, Naoto
• Granted Patent: US 7,728,582 B2
• Time in Patent Office: Days
• US Class Current: 324/207.25
• CPC Class Codes: G01D 2205/80 Manufacturing details of magnetic targets for magnetic encoders
• CPC Class Codes: G01P 3/443 mounted in bearings bearings F16C
• CPC Class Codes: G01P 3/487 delivered by rotating magnets

Abstract

To hold a pulsar ring (1) of a magnetic rotary encoder well concentrically by a pressure inserting jig (4) when the pulsar ring is installed on a rotary body (3), the pulsar ring (1) comprises a metallic annular holder (10) and a pulsar main body (20) of a magnetic rubber material, the holder (10) comprises a disk portion (11) where the pulsar body (20) is bonded, a mounting tube portion (12) having a diameter smaller than the outer diameter of the disk portion (11) and being fixed to the rotary body (3), a fold-back portion (15) folded inward, and an intermediate portion (13) extending therefrom toward the mounting tube portion (12) so as to be separated from the disk portion (11), and the outer circumference of the fold-back portion (15) or a guide portion (22) mounted thereon is fitted to a circumferential wall portion (42) of the jig (4).

Claims

1. A pulsar ring of a magnetic type rotary encoder comprising:

an annular holder made of a metal; and

a pulsar main body integrally formed on the holder by a magnetic rubber material,

wherein said holder is provided with a disc portion to which said pulsar main body is bonded, a mounting tube portion having a smaller diameter than an outer diameter of the disc portion and being fixed to a rotating body, a fold-back portion folded back to an inner circumferential side from an outer circumference of said disc portion so as be formed in a curved shape having a round-shaped outer circumferential convex surface, and an intermediate portion extending to said mounting tube portion in such a direction as to be apart from said disc portion via the fold-back portion, and wherein an outer circumferential portion of the pulsar main body is provided with a guide portion which is formed so as to surround the round-shaped outer circumferential convex surface of the fold-back portion in the holder and is capable of coming into close contact with an inner circumferential surface of a circumferential wall portion of a pressure inserting jig with a suitable collapsing margin.

2. A pulsar ring of a magnetic type rotary encoder as claimed in claim 1, wherein a bent end inclined toward the mounting tube portion side than a plane which is vertical to an axis is formed at an end portion at an opposite side to the disc portion of the holder.