# US 7,608,952 B2 · Use of PFPE lubricant in automotive applications

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- Number: US 7,608,952 B2
- Document ID: US7608952B2
- Status: Granted
- Kind: B2
- Application number: 11/882,614
- Filed: 2007-08-03
- Published: 2008-02-07
- Granted: 2009-10-27
- Earliest claimed: 2006-08-04
- Assignees: Continental Automotive Canada, Inc.
- Inventors: Craig Andrew Weldon; Calvin Wang
- Web page: https://patentgrep.com/patent/US7608952B2

## CPC

- F16N 15/00: Lubrication with substances other than oil or grease; Lubrication characterised by the use of particular lubricants in particular apparatus or conditions (F16N17/00 takes precedence; lubricating compositions, selection of particular substances as lubricants in general C10M)
- H02K 5/1672: {radially supporting the rotary shaft at both ends of the rotor (H02K5/1677 takes precedence)}
- H02K 5/1732: {radially supporting the rotary shaft at both ends of the rotor (H02K5/1737 takes precedence)}
- H02K 7/06: Means for converting reciprocating motion into rotary motion or vice versa
- F16N: LUBRICATING
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})

## Abstract

A motor (10) for a vehicle includes a stator assembly (14) and a rotor assembly (16). Bearing structure (20, 22) support the rotor assembly to permit rotation of the rotor assembly with respect to the stator assembly. A shaft (30) is threadedly engaged with the rotor assembly and is constructed and arranged such that rotation of the rotor assembly causes linear movement of the shaft. A perfluoropolyether (PFPE) based lubricant (38), having an thermal functionality upper temperature limit of over +200° C., lubricates at least the bearing structure.

## Claims

### Claim 1

A motor for vehicle, the motor comprising:
a stator assembly,
a rotor assembly,
bearing structure supporting the rotor assembly to permit rotation of the rotor assembly with respect to the stator assembly,
a shaft, threadedly engaged with the rotor assembly and constructed and arranged such that rotation of the rotor assembly causes linear movement of the shaft, and
a perfluoropolyether (PFPE) based lubricant, having an upper temperature limit of over 200° C. but less than or equal to about 250° C., lubricating at least the bearing structure.

### Claim 2 (depends on 1)

The motor of claim 1, wherein the bearing structure includes a front bearing and an open, rear ball bearing, the lubricant lubricating the rear ball bearing being a PFPE oil and the lubricant lubricating the front bearing being a PFPE grease.

### Claim 3 (depends on 1)

The motor of claim 1, wherein the lubricant further lubricates the threaded engagement of the shaft and rotor assembly.

### Claim 4 (depends on 3)

The motor of claim 3, wherein the lubricant lubricating the threaded engagement of the shaft and rotor assembly is a PFPE grease.

### Claim 5 (depends on 1)

The motor of claim 1, wherein an end of the shaft is associated with the front bearing defining an anti-rotate area, and where the lubricant further lubricates the anti-rotate area.

### Claim 6 (depends on 5)

The motor of claim 5, wherein the lubricant lubricating the anti-rotate area is a PFPE grease.

### Claim 7 (depends on 1)

The motor of claim 1, wherein a temperature range of the PFPE lubricant is about −90to +250° C.

### Claim 8 (depends on 1)

The motor of claim 1, wherein the motor is constructed and arranged to be part of an idle air control valve.