Sensor and rollling bearing apparatus with sensor

• US 20060110086A1
• Filed: 01/12/2006
• Published: 05/25/2006
• Est. Priority Date: 12/01/2000
• Status: Abandoned Application

• Current Assignee: NSK Limited
• Original Assignee: NSK Limited
• Inventors: Endo, Shigeru, Takahashi, Toshio, Takizawa, Takeshi, Sakatani, Ikunori, Morita, Kouichi, Fukuyama, Hiromasa
• Application Number:
  US11/330,148
• Publication Number:
  US 20060110086A1
• Time in Patent Office: Days
• US Class Current: 384/448
• CPC Class Codes: B61F 15/20 Details
• CPC Class Codes: F16C 19/386 in O-arrangement
• CPC Class Codes: F16C 19/52 with devices affected by abnormal or undesired conditions
• CPC Class Codes: F16C 19/525 related to temperature and heat, e.g. insulation
• CPC Class Codes: F16C 2326/10 Railway vehicles in general B61
• CPC Class Codes: F16C 33/723 Shaft end sealing means, e.g. cup-shaped caps or covers
• CPC Class Codes: F16C 35/063 Fixing them on the shaft with interposition of an element F16C35/07
• CPC Class Codes: F16C 41/007 Encoders, e.g. parts with a plurality of alternating magnetic poles
• CPC Class Codes: G01M 13/045 Acoustic or vibration analysis
• CPC Class Codes: G01P 1/026 for speed measuring devices, e.g. pulse generator
• CPC Class Codes: G01P 3/443 mounted in bearings bearings F16C
• CPC Class Codes: G01P 3/487 delivered by rotating magnets

Abstract

A rolling bearing apparatus with sensor includes a sensor unit retaining a plurality of types of sensors for detecting the status of a rolling bearing, in a single holder. The plurality of types of sensors are at least two types of sensors of a rotation speed sensor, a temperature sensor, and an acceleration sensor.

Claims

1. An abnormality determining apparatus for a bearing unit including a rotating bearing:

a detecting unit, for detecting at least one of rotation speed, bearing temperature, and bearing vibration, in a sensor unit, wherein

the sensor unit is fixed to a seal case.

2. The abnormality determining apparatus according to claim 1, wherein

an outer end section of the seal case projects outward from the seal ring, and

the sensor unit is coupled to the seal case for supporting the seal ring by a bolt being screw-engaged with a nut.

3. The abnormality determining apparatus according to claim 1, wherein

the detecting unit comprises a sensor that detects a rotation speed, and

an encoder is fixedly fitted on an outer end section of an axle.

4. The abnormality determining apparatus according to claim 1, wherein the sensor unit comprises:

a circuit member for processing a signal detected by the detecting unit, and

a circuit board mounting the detecting unit and the circuit member.

5. The abnormality determining apparatus according to claim 4, wherein

the sensor unit includes a reference voltage generating circuit for supplying a reference voltage to the sensor of the detecting unit.

6. The abnormality determining apparatus according to claim 4, wherein

a surface of the circuit board mounting the detecting unit and the circuit member is molded by a water-resistant resin.

7. The abnormality determining apparatus according to claim 6, wherein the water-resistant resin is a silicone resin.

8. The abnormality determining apparatus according to claim 1, wherein

the sensor unit comprises a sensor with the detecting unit for detecting at least one of rotation speed, bearing temperature, and bearing vibration, in a single holder, and

the holder is made of nonmagnetic material with good heat conductivity.

9. The abnormality determining apparatus according to claim 8, wherein

the holder is made of at least one of aluminum, magnesium, copper, zinc, alloys thereof, or stainless steel.

10. The abnormality determining apparatus according to claim 1, wherein

the bearing unit is used for a rotating member for supporting a railway wheel.