Electricity: measuring and testing – Electrical speed measuring – Including speed-related frequency generator
Patent
1998-08-05
2000-06-27
Patidar, Jay
Electricity: measuring and testing
Electrical speed measuring
Including speed-related frequency generator
384448, G01P 3488, F16C 4104
Patent
active
060811110
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to an rpm-measuring system with a revolving, areawise magnetized rotor, integrated into a wheel seat of a motor vehicle.
A similar object for example is known from EP 0 518 157 A1. An rpm-measuring system is described there, whose sensor and magnetized rotor are installed on an anti-friction bearing. The revolving outer ring of the anti-friction bearing has the magnetized rotor on one of its end faces. The sensor is disposed opposite the rotor in the axial direction. In this case, the former is fastened inside a ring, which is attached to the inner ring of the anti-friction bearing. For this purpose it has a profile which, on the one hand extends around the sensor, and on the other hand is cantilevered over the outer ring of the anti-friction bearing. Between the edge of the cantilevered section and the cylindrical outer surface of the outer ring of the anti-friction bearing there is a small gap, in front of which a magnet is disposed at a short distance.
The magnet serves the purpose of attracting and collecting magnetic or magnetizable dirt, for example break abrasion and other particles or flakes generated during the normal course of wear and tear, before they reach the magnetized rotor of the rpm-measuring system through the small gap and possibly disturb the effectiveness of the sensor.
SUMMARY OF THE INVENTION
With the subject of the invention, the rotor is disposed on a magnetizable support, whose open back faces the gap between the wheel support and the adjacent and/or opposite wheel hub or shaft component. Since the support is made of a magnetizable material, it becomes magnetized by the rotor arranged on it. In this way its open back has the effect of a magnet. Consequently, the support shields the rotor from magnetizable dirt, which can reach the rotor by way of the gap between the wheel bearing components moved in relation to each other. In this way, at the same effectiveness as cited in the prior art, the subject of the invention requires fewer components, a lighter weight and a smaller structural space.
The rotor, for example a multi-pole ring, magnetically charged in segments, can have a symmetrical form in respect to its rotational axis with almost any contour. For example, it is a ring whose cylindrical and/or plane contour its magnetized. The support is embodied in accordance with its magnetic direction and the disposition of the sensors. Among others, it thus can be a ring with a cylindrical or plane contact surface for the rotor.
The location of the rotor and its support within the wheel seat can be freely selected. A disposition at the edge of the anti-friction bearing has proven itself as practical.
BRIEF DESCRIPTION OF THE DRAWINGS
Further details of the invention ensue from the dependent claims and the following description of a schematically represented embodiment:
FIG. 1: Section of a motor vehicle wheel seat with an rpm-measuring system.
DESCRIPTION OF THE PREFERRED EMBODIMENT
The rpm-measuring system in accordance with FIG. 1 in this case is integrated into a wheel seat or a motor vehicle drive shaft. A driving wheel, not shown, is seated on a wheel support (15) with the aid of a dual-row angular ball bearing (20), which among others has an outer ring (21) and two inner rings (22, 23). At least one component (13) of the wheel hub of the drive wheel is the outermost inner ring (22), referring to the center of the shaft, of the angular ball bearing (20). This inner ring (22) is seated via notch- or gear-shaft teeth on a drive shaft (10). The inner ring (23) of the angular ball bearing (20) is clamped between the outermost inner ring (22) and a shaft shoulder (11) of the drive shaft (10). The flange-shaped outer ring (21) of the angular ball bearing (20) is bolted to the wheel support (15). The packing rings (25) and (26) of the anti-friction bearing are disposed on both sides of the rolling bodies (24).
An rpm sensor (1) of an anti-blocking system, is seated in a bore (16), aligned almost vertically in relation to the rot
REFERENCES:
patent: 5614822 (1997-03-01), Sakamoto et al.
Herderich Hans-Juergen
McCarthy Craig
Patidar Jay
Robert & Bosch GmbH
Striker Michael J.
LandOfFree
RPM-measuring system with a revolving areawide magnetized rotor does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with RPM-measuring system with a revolving areawide magnetized rotor , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and RPM-measuring system with a revolving areawide magnetized rotor will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1787329