US4369387A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric drive unit
Assignee: ITT Inc
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Filing: 1980-03-10
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Granted: 1983-01-18
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Expires: 2000-03-10
Abstract
Abstract An electric drive unit particularly adapted for actuating windshield wiper assemblies includes a motor having it's armature shaft carrying aportion having two oppositely pitched worm threads. Two worm gear wheels are disposed each on opposite sides of the threaded portion and in engagement therewith. The axes of rotation of the worm wheels are in parallel. Two spur wheels are each concentrically seated on a respective worm wheel. The spur wheels each engage a wheel having its axis of rotation located in a plane defined by the axes of rotation of the worm wheels. The toothed wheel is connected to a drive shaft.
Inventors
- 👤 Gerhard Haar
- 👤 Heinz Jakob
- 👤 Helmut Landa
- 👤 Erwin Mayer
- 👤 Hans Prohaska
- 👤 Theodor Schneider
- 👤 Karl-Friedrich Schubert
- 👤 Martin Weber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:52
CPC Classifications
F; F16; F16C; F16C33/00; F16C33/02; F16C33/04; F16C33/06; F16C33/10; F16C33/1025; F16C33/106; F16C33/1065; B; B60; B60S; B60S1/00; B60S1/02; B60S1/04; B60S1/06; B60S1/08; B60S1/16; F16H; F16H1/00; F16H1/02; F16H1/20; F16H1/22; F16H1/222; F16H1/225; H; H02; H02K; H02K5/00; H02K5/04; H02K5/16; H02K5/167; H02K5/1672; H02K7/00; H02K7/08; H02K7/081; H02K7/10; H02K7/116; H02K7/1163; H02K7/1166; F16C2326/00; F16C2326/01; F16C2326/09; F16C2361/00; F16C2361/61; F16C2380/00; F16C2380/26; F16C2380/27; F16H57/00; F16H57/02; F16H57/021; F16H2057/0213; H02K2205/00; H02K2205/03; H02K2213/00; H02K2213/09; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19642; Y10T74/19698; Y10T74/19828; Y10T74/19842
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
224 words
An electric drive unit comprising: an electric motor comprising a housing, an armature winding in said housing, and an armature shaft extending from said housing; a gear housing connected to said motor housing; said armature shaft extending into said gear housing and having a first portion having first and second oppositely pitched worm threads; said gear housing including: a first gear means comprising a first worm gear wheel having a first rotational axis and disposed on one side of said first shaft portion and adapted to engage said first worm thread, a first spur wheel concentrically seated on said first worm gear and rotatable with said first worm gear about said first rotational axis; a second gear means comprising a second worm gear wheel having a second rotational axis and disposed on the opposite side of said first shaft portion and adapted to engage said second worm thread, a second spur wheel concentrically seated on said second worm gear and rotatable with said second worm gear about said second rotational axis; said first and second axes of rotation being parallel; a driven output shaft; a toothed wheel seated on said output shaft and adapted to engage said first and second spur wheels, said toothed wheel having a third axis of rotation located in a plane defined by said first and second axes of rotation.
Claim 2
Dependent Claim
224 words
An electric drive unit comprising: an electric motor comprising a housing, an armature winding in said housing, and an armature shaft extending from said housing; a gear housing connected to said motor housing; said armature shaft extending into said gear housing and having a first portion having first and second oppositely pitched worm threads; said gear housing including: a first gear means comprising a first worm gear wheel having a first rotational axis and disposed on one side of said first shaft portion and adapted to engage said first worm thread, a first spur wheel concentrically seated on said first worm gear and rotatable with said first worm gear about said first rotational axis; a second gear means comprising a second worm gear wheel having a second rotational axis and disposed on the opposite side of said first shaft portion and adapted to engage said second worm thread, a second spur wheel concentrically seated on said second worm gear and rotatable with said second worm gear about said second rotational axis; said first and second axes of rotation being parallel; a driven output shaft; a toothed wheel seated on said output shaft and adapted to engage said first and second spur wheels, said toothed wheel having a third axis of rotation located in a plane defined by said first and second axes of rotation.
Claim 3
Dependent Claim
35 words
An electric drive unit in accordance with claim 1 wherein said toothed wheel is an internal toothed wheel and said first and second axes of rotation are disposed within the circumference of said toothed wheel.
Claim 4
Dependent Claim
32 words
An electrical drive unit in accordance with claim 2 comprising a bearing plate connected to said gear housing and adapted to support said toothed wheel and said first and second spur wheels.
Claim 5
Dependent Claim
46 words
An electric drive unit in accordance with claim 3 wherein said toothed wheel comprises a bushing adapted to receive said driven shaft, and a cylindrical portion having a smaller diameter than said driven shaft, said bearing plate having an aperture adapted to receive said cylindrical portion.
Claim 6
Dependent Claim
28 words
An electric drive unit in accordance with claim 4 comprising a bearing supporting said armature shaft, said bearing being disposed between said first portion and said armature winding.
Claim 7
Dependent Claim
25 words
An electric drive unit in accordance with claim 5 wherein said gear housing includes a recess adapted to receive one end of said armature shaft.
Claim 8
Dependent Claim
17 words
An electric drive unit in accordance with claim 6 wherein said bearing is a ball bearing assembly.
Claim 9
Dependent Claim
22 words
An electric drive unit in accordance with claim 7 comprising an adjusting screw for compensating for axial plug of said armature shaft.
Claim 10
Dependent Claim
36 words
An electric drive unit in accordance with claim 8 wherein said adjusting screw is guided on said gear housing and is movable along the axial direction of said armature shaft, said adjusting screw includes said recess.
Claim 11
Dependent Claim
16 words
An electric drive unit in accordance with claim 7 wherein said bearing is a slide bearing.
Claim 12
Dependent Claim
67 words
An electric drive unit in accordance with claim 10 wherein said slide bearing is in the shape of a truncated sphere, said slide bearing having a central bore adapted to receive said armature shaft, said gear housing includes a recess adapted to receive said slide bearing, and said gear housing further comprises a clamping disk disposed within a portion of said recess to retain said slide bearing.
Claim 13
Dependent Claim
15 words
An electric drive unit in accordance with claim 11 wherein said clamping disk is ring-shaped.
Claim 14
Dependent Claim
17 words
An electric drive unit in accordance with claim 12 wherein said clamping disk comprises a plastic material.
Claim 15
Dependent Claim
50 words
An electric drive unit in accordance with claim 12 wherein said slide bearing receiving recess includes a first recess portion in the shape of an approximately hemispherical cup adapted to receive said slide bearing and a second portion having a contour adapted to match the contour of said clamping disk.
Claim 16
Dependent Claim
21 words
An electric drive unit in accordance with claim 14 wherein the wall of said bore includes a plurality of lubricating grooves.
Claim 17
Dependent Claim
22 words
An electric drive unit in accordance with claim 15 wherein said lubricating grooves extend in a direction parallel to said armature shaft.
Claim 18
Dependent Claim
22 words
An electric drive unit in accordance with claim 16 wherein each of said plurality of lubricating grooves extends longitudinally across said wall.
Claim 19
Dependent Claim
25 words
An electric drive unit in accordance with claim 16 wherein each of said plurality of lubricating grooves extends longitudinally over a portion of said wall.
Claim 20
Dependent Claim
19 words
An electric drive unit in accordance with claims 17 or 18 wherein said slide bearing comprises dry powdered metal.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-01-17 | 1986-07-19 | 1987-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-17 | 1990-07-19 | 1991-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-17 | 1994-07-19 | 1995-01-18 | $7700.00 | Window Closed / Lapsed |