Inductive rotational speed sensor and method for producing same

Patent metadata

Field	Value
Publication number	US-11761975-B2
Application number	US-201917312514-A
Country	US
Kind code	B2
Filing date	Dec 3, 2019
Priority date	Dec 18, 2018
Publication date	Sep 19, 2023
Grant date	Sep 19, 2023

Abstract

An inductive rotational speed sensor, including: a coil body having a coil and connecting lines which at least partially extend axially or radially with respect to the coil windings; a casing formed from a plastics material and at least partially enclosing the coil body; and a fixing device for facilitating a configuration of the casing, the fixing device including: for radially extending connecting lines, a material core clearance in the casing so as to fix the electrical connecting lines at a mutual spacing when configuring the casing; or an anti-twist safeguard to prevent the coil body rotating relative to a tool used for configuring the casing while the latter is being configured, wherein the anti-twist safeguard partially protrudes from the casing, or extends at least up to an external surface of the casing. Also described is a related method.

First claim

The invention claimed is:

1. An inductive rotational speed sensor, comprising:
a coil body having a coil and connecting lines which at least partially extend axially or radially with respect to the coil windings;
a casing formed from a plastics material and at least partially enclosing the coil body; and
a fixing device for facilitating a configuration of the casing, wherein the fixing device includes:
a material core clearance in the casing, for radially extending connecting lines, so as to fix the electrical connecting lines at a mutual spacing when configuring the casing;

wherein the casing has external ribs which are configured on an external surface and are for clamping a sleeve of an external protective sleeve, and wherein the anti-twist safeguard is part of a portion of a rib.

2. The inductive rotational speed sensor of claim 1 , wherein the casing has at least one plateau, and wherein the plateau is configured for fixing thereon an external protective sleeve by caulking.

3. The inductive rotational speed sensor of claim 1 , wherein the connecting lines extend axially, and wherein the casing has complanate faces, the connecting lines to the coil body running therebetween, so as to facilitate handling during or after the configuration of the casing and to provide a further anti-twist safeguard.

4. The inductive rotational speed sensor of claim 3 , wherein the complanate faces have a labeling area.

5. An inductive rotational speed sensor, comprising:
a coil body having a coil and connecting lines which at least partially extend axially or radially with respect to the coil windings;
a casing formed from a plastics material and at least partially enclosing the coil body;
a fixing device for facilitating a configuration of the casing, wherein the fixing device includes a material core clearance in the casing, for radially extending connecting lines, so as to fix the electrical connecting lines at a mutual spacing when configuring the casing; and
a protective sleeve having a trumpet-shaped peripheral widening for protecting the casing, wherein an O-ring seal is configured between the protective sleeve and the casing so as to guarantee reliable sealing;
wherein the trumpet-shaped peripheral widening has a fastening device for fastening the protective sleeve and the casing.

6. The inductive rotational speed sensor of claim 5 , wherein the fastening device has a latching hook or a bayonet mount.

7. A method for producing an inductive rotational speed sensor, the method comprising:
providing a coil body having coil windings and connecting lines which at least partially extend axially or radially with respect to the coil windings;
configuring a casing from a plastics material and which at least partially encloses the coil body; and
fixing at least part of the coil body, using a tool, while configuring the casing, by performing the following:
introducing, for radially extending connecting lines, a die between the electrical connecting lines while configuring the case so as to fix the connecting lines at a predefined mutual spacing;

wherein the tool has a table that is displaceable in a linear manner and that has at least two lower tool parts and one upper tool part, so as to enable the coil bodies to be populated by a linear displacement is utilized for configuring the casing.

8. The method of claim 7 , wherein the coil body for electrically contacting the coil has two conductor rails which include in each case one barrier between a wire contact of the coil and a contact region for the connecting lines, and wherein the configuration of the casing includes overmolding of the coil body, and the overmolding is carried out so that the barriers cause an non-utilized overmolding compound to be deflected when overmolding.

Assignees

• Knorr Bremse Systeme Fuer Nutzfahrzeuge Gmbh

Inventors

• Lechner Klaus
• Kluftinger Andre
• Huber Christoph
• Fruhstorfer Ines
• Buettner Martin
• Palzer Stefan

Classifications

• G01P1/026 Primary

  for speed measuring devices, e.g. pulse generator · CPC title

• G01P3/481 Primary

  of pulse signals · CPC title

• G01P3/488

  delivered by variable reluctance detectors · CPC title

• B29C45/14065

  Positioning or centering articles in the mould · CPC title

• B29C2045/14131

  using positioning or centering means forming part of the insert · CPC title