US3793545A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Speed sensing apparatus
Assignee: Robert Bosch GmbH
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Filing: 1972-03-10
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Granted: 1974-02-19
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Expires: 1992-03-10
Abstract
Abstract An electromagnetic rotational speed sensing apparatus includes a magnetic circuit formed by a rotor, a stator and an air gap between the rotor and the stator. The rotor has a surface provided with recesses or teeth. The stator is provided with an electromagnetic sensor. The air gap is changeable in size during rotation of the rotor by the teeth or recesses. A stationary support is provided which movably supports the stator to permit movement towards and away from the rotor. Support members are provided (e.g. spreading or clamping members) which permit such movement only upon overcoming substantial static friction. The oppositely disposed surface portions of the stator and the rotor are developed to permit possible contact between them without damage.
Inventors
- 👤 H Leiber
- 👤 D Thom
- 👤 A Frenznick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:07
CPC Classifications
G; G01; G01P; G01P3/00; G01P3/42; G01P3/44; G01P3/48; G01P3/481; G01P3/488; G01P3/443
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
236 words
In an electromagnetic rotational speed sensing apparatus for determining the angular speed between two components rotating with respect to one another and which includes a magnetic circuit formed of rotor means having a surface provided with teeth, stator means, an air gap disposed between the stator means and the rotor means, the air gap being changeable in size during rotation of the rotor means by the teeth and electromagnetic sensor means arranged on the stator means for sensing changes in the magnetic air gap and converting them to electrical signals, the improvement comprising stationary support means for movably supporting said stator means to permit movement toward and away from said rotor means; means for providing substantial static friction between said stator and said stationary support means to permit the movement of said stator means with respect to said stationary support means as a result of said rotor means contacting said stator means and overcoming the substantial static friction so that when said rotor means contacts said stator means with sufficient force for the static friction to be overcome, the stator means is moved away from said rotor means so as to enlarge the air gap, whereby said stator means can be initially arranged such that the air gap is set at a minimum; and the oppositely disposed surface portion of said rotor means and said stator means being formed to permit contact between them without damage.
Claim 2
Dependent Claim
236 words
In an electromagnetic rotational speed sensing apparatus for determining the angular speed between two components rotating with respect to one another and which includes a magnetic circuit formed of rotor means having a surface provided with teeth, stator means, an air gap disposed between the stator means and the rotor means, the air gap being changeable in size during rotation of the rotor means by the teeth and electromagnetic sensor means arranged on the stator means for sensing changes in the magnetic air gap and converting them to electrical signals, the improvement comprising stationary support means for movably supporting said stator means to permit movement toward and away from said rotor means; means for providing substantial static friction between said stator and said stationary support means to permit the movement of said stator means with respect to said stationary support means as a result of said rotor means contacting said stator means and overcoming the substantial static friction so that when said rotor means contacts said stator means with sufficient force for the static friction to be overcome, the stator means is moved away from said rotor means so as to enlarge the air gap, whereby said stator means can be initially arranged such that the air gap is set at a minimum; and the oppositely disposed surface portion of said rotor means and said stator means being formed to permit contact between them without damage.
Claim 3
Dependent Claim
16 words
An arrangement as defined in claim 1 wherein said oppositely disposed surface portions are slide surfaces.
Claim 4
Dependent Claim
18 words
An arrangement as defined in claim 2 wherein said electromagnetic sensor is a coil penetrated by magnetic flux.
Claim 5
Dependent Claim
27 words
An arrangement as defined in claim 1 wherein said electromagnetic sensor is at least one magnetic field sensitive semiconductor device which is exposed to the changing field.
Claim 6
Dependent Claim
43 words
An arrangement as defined in claim 1, further comprising a wheel bearing of a vehicle wheel, and said stator means and said rotor means are positioned in the vicinity of said wheel bearing, whereby the speed of the vehicle wheel can be sensed.
Claim 7
Dependent Claim
42 words
An arrangement as defined in claim 5, further comprising a wheel bearing seal, and wherein said wheel bearing is an inner wheel bearing, said stator means and said rotor means being disposed between said inner wheel bearing and said wheel bearing seal.
Claim 8
Dependent Claim
85 words
An arrangement as defined in claim 1 wherein said stationary support means is provided with an opening and said stator means comprises a unit insertable into said opening in said stationary support means, and further comprising a crossbar fastened to an end of said unit, said crossbar bearing the magnetic member of said stator means, said stator means being movable in said opening against the substantial static friction whereby the magnetic member may move away from said rotor means upon overcoming the substantial static friction.
Claim 9
Dependent Claim
47 words
An arrangement as defined in claim 1 wherein said stationary support means is provided with an opening, and said stator means is a plug-in unit which can be inserted into said opening in said stationary support means and is dIsplaceable in the axial direction of said opening.
Claim 10
Dependent Claim
20 words
An arrangement as defined in claim 8 wherein said opening lies substantially parallel to the axis of said rotor means.
Claim 11
Dependent Claim
20 words
An arrangement as defined in claim 8 wherein said opening lies substantially perpendicular to the axis of said rotor means.
Claim 12
Dependent Claim
20 words
An arrangement as defined in claim 1 wherein said teeth are axially disposed and said stator means is correspondingly positioned.
Claim 13
Dependent Claim
20 words
An arrangement as defined in claim 1 wherein said teeth are radially disposed and said stator means is correspondingly positioned.
Claim 14
Dependent Claim
35 words
An arrangement as defined in claim 12 wherein said teeth define inner teeth, and an annular extending surface is provided in the vicinity of said inner teeth which surface extends radially beyond said inner teeth.
Claim 15
Dependent Claim
48 words
An arrangement as defined in claim 2 wherein said slide surface of said rotor means is provided by a slight protrusion defining a surface facing and positioned away from said teeth whereby the stator means can be set in its spacing from the teeth of the rotor means.
Claim 16
Dependent Claim
42 words
An arrangement as defined in claim 2 wherein the gaps between said teeth are filled with a nonmagnetic material so that the setting of the plug-in unit is effected by means of the teeth or the material disposed above the teeth, respectively.
Claim 17
Dependent Claim
52 words
An arrangement as defined in claim 2 wherein said stator means is developed as a plug-in unit and the gaps between said teeth are filled with a nonmagnetic material which is also disposed above said teeth whereby the position of the stator means is determined by the material disposed above the teeth.
Claim 18
Dependent Claim
92 words
An arrangement as defined in claim 8 wherein said plug-in unit comprises two jointedly connected parts of which one serves as the fastening means in said opening and the other part, which bears the magnetic member of said stator means, can be set at an angle with respect to said first part in a direction perpendicular to the plug-in direction, and further comprising means associated with said rotor means and with an end of said stator means for effecting a desired alignment of said second part with respect to said rotor means.
Claim 19
Dependent Claim
67 words
An arrangement as defined in claim 1 wherein said stationary support means comprises a connecting housing, said stator means being positioned partially within said connecting housing, a connecting cable means for said electromagnetic sensor means being connected in a stress-relieving manner to said connecting housing, said stator means being displaceable with respect to said connecting housing, which partially surrounds it, in the direction of said rotor means.
Claim 20
Dependent Claim
27 words
An arrangement as defined in claim 18, further comprising flexible conductive connection means within said connecting housing for connecting said connecting cable means to said stator means.
Claim 21
Dependent Claim
50 words
An arrangement as defined in claim 18 wherein said means for providing substantial static friction comprises a plug-in connection provided between said connecting housing and said stator means, said plug-in connection comprising male and female elements which at least partially effect said substantial static friction by contact with one another.
Claim 22
Dependent Claim
96 words
An arrangement as defined in claim 1 for a vehicle wheel mounted on a nonrotatable kingpin and further comprising said kingpin having an axial opening at its front end, a housing means and a wheel hub, and wherein said stator means is inserted into said axial opening, and said stator means is provided with pole surfaces which are disposed approximately perpendicular to the axis of rotation and said rotor means which is in the form of an annular disc fastened in said housing which surrounds said stator means and is fixedly connected to said wheel hub.
Claim 23
Dependent Claim
42 words
An arrangement as defined in claim 1 further comprising releasable spring means for automatically positioning said stator means at said rotor means while overcoming the static friction and during installation to assure initial contact between said rotor means and said Stator means.
Claim 24
Dependent Claim
25 words
An arrangement as defined in claim 4 wherein said semiconductor device is disposed in said air gap between said stator means and said rotor means.
Claim 25
Dependent Claim
55 words
An arrangement as defined in claim 4 wherein said at least one semiconductor device comprises two magnetic field sensitive semiconductor devices which are operatively positioned so that during maximum influence on one of said semiconductor devices by the magnetic field the other of said semiconductor devices is subjected to minimum influence by the magnetic field.
Claim 26
Dependent Claim
47 words
An arrangement as defined in claim 24 wherein said rotor means comprises a wheel and said two semiconductor devices are positioned on an end of said stator means and are separated by a given angle from one another with respect to the center point of said wheel.
Claim 27
Dependent Claim
30 words
An arrangement as defined in claim 24 wherein said rotor means comprises two concentric rings of teeth, each ring of teeth lying opposite a respective one of said semiconductor devices.
Claim 28
Dependent Claim
46 words
An arrangement as defined in claim 1, further comprising a wheel bearing including a rotating ring, and wherein said rotor means comprises an annular rotor which bears said teeth and contacts said rotating ring of said wheel bearing with at least a portion of one surface.
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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) | 1977-02-18 | 1977-08-20 | 1978-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-18 | 1981-08-20 | 1982-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-18 | 1985-08-20 | 1986-02-19 | $7700.00 | Window Closed / Lapsed |