US3769533A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adaptive braking wheel speed sensor
Assignee: Bendix Corp
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Filing: 1972-05-22
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Granted: 1973-10-30
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Expires: 1992-05-22
Abstract
Abstract An electromagnetic probe is installed in the differential housing of an automotive vehicle. The probe includes a substantially U-shaped core piece having a base which abuts a permanent magnet and pair of generally parallel arms which extend through the centers of a pair of coils. The arms extend into close poximity with circumferentially spaced teeth formed on the differential frame and on one of the axles. Since rotation of the teeth past the legs changes the reluctance path of the magnet, a pulsed output will be generated in the coils, the frequency of which varies directly according to the speed of rotation of the frame and of the axle. Since the frame rotates at substantially the same speed as the vehicle drive shaft or at some known fraction of that speed, and since the drive shaft rotates at the average speed of the left and right axles, by determining the speed of rotation of the frame and of one of the axles, the speed of rotation of the other axle may be readily determined, thereby providing intelligence of the speed of rotation of both of the vehicle''s rear axles by using only the single probe. This speed sensor is particularly useful in automotive adaptive braking systems.
Inventors
- 👤 E Pauwels
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:10
CPC Classifications
G; G01; G01P; G01P3/00; G01P3/42; G01P3/44; G01P3/48; G01P3/481; G01P3/488; B; B60; B60T; B60T8/00; B60T8/32; B60T8/321; B60T8/329; F; F16; F16H; F16H48/00; F16H48/06; F16H48/08
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
224 words
In a vehicle having a drive shaft and a pair of axles, means rotatably carried on said vehicle for drivingly interconnecting said drive shaft with each of said axles, said interconnecting means including a housing, a frame within said housing, means for supporting said frame for rotation relative to the vehicle, means drivingly interconnecting said frame with said drive shaft, said frame defining a bore therewithin, each of said axles being rotatably received within said bore and extending from opposite ends of the latter, said axles being supported in said bore for rotation with respect to said frame, means drivably interconnecting said frame and each of the axles whereby the speed of rotation of each of said axles bears a predetermined relationship with the rotational speed of said frame and the rotational speed of the other axle, whereby the rotational speed of the other axle may be determined if the rotational speed of one of the axles and the frame are determined, and means for generating signals proportional to the rotational speed of said frame and of one of said axles, said generating means including probe means for generating output signals proportional to the rotational speed of said frame and of said one axle, and means mounting said probe means on said housing adjacent the point where said one axle extends from said bore.
Claim 2
Dependent Claim
224 words
In a vehicle having a drive shaft and a pair of axles, means rotatably carried on said vehicle for drivingly interconnecting said drive shaft with each of said axles, said interconnecting means including a housing, a frame within said housing, means for supporting said frame for rotation relative to the vehicle, means drivingly interconnecting said frame with said drive shaft, said frame defining a bore therewithin, each of said axles being rotatably received within said bore and extending from opposite ends of the latter, said axles being supported in said bore for rotation with respect to said frame, means drivably interconnecting said frame and each of the axles whereby the speed of rotation of each of said axles bears a predetermined relationship with the rotational speed of said frame and the rotational speed of the other axle, whereby the rotational speed of the other axle may be determined if the rotational speed of one of the axles and the frame are determined, and means for generating signals proportional to the rotational speed of said frame and of one of said axles, said generating means including probe means for generating output signals proportional to the rotational speed of said frame and of said one axle, and means mounting said probe means on said housing adjacent the point where said one axle extends from said bore.
Claim 3
Dependent Claim
102 words
The invention of claim 1: said one axle having a first set of circumferentially spaced teeth provided thereon, said teeth being located adjacent the point where said one axle extends from said bore; said frame including an annular portion defining said bore therewithin, a second set of circumferentially spaced teeth provided on the outer circumferential surface of the annular portion of the frame adjacent the point where said one axle extends from said bore; said housing having a single opening defined therein exposing said point where said one axle extends from said bore, said probe means being retained within said single opening.
Claim 4
Dependent Claim
36 words
The invention of claim 2: said probe means including a pair of core members, one end of each of said core members extending adjacent the teeth on said axle and the teeth on said housing, respectively.
Claim 5
Dependent Claim
32 words
The invention of claim 3: said probe including a pair of coils, one of said coils circumscribing each of said core members, and magnetic means engaging the base of said core members.
Claim 6
Dependent Claim
32 words
The invention of claim 4; and means connecting the other ends of said core members to present a generally U-shaped structure, said magnetic means including a single magnet abutting the connecting means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |