Classifications

• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
  • G01D11/00—Component parts of measuring arrangements not specially adapted for a specific variable
  • G01D11/24—Housings ; Casings for instruments
  • G01D11/245—Housings for sensors
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
  • G01P1/00—Details of instruments
  • G01P1/02—Housings
  • G01P1/026—Housings for speed measuring devices, e.g. pulse generator

Definitions

• the invention relates to a device for detecting the movement of a movable component, the device having an inner part and the inner part having a housing, in which conductor tracks are arranged, which carry electrical components and a sensor element and form plug contacts with their one ends protrude from the inner part, the inner part being extrusion-coated or molded around in such a way that the plug contacts protrude into the interior of a plug receptacle of the plastic housing.
• the object of the invention is therefore to provide a device of the type mentioned at the outset which avoids damage to the electrical components and / or the sensor element.
• this object is achieved in that the electrical components and / or the sensor element are covered by covers and molded or encapsulated by the plastic housing.
• This design prevents contact of the electrical components and / or the sensor element with the enveloping material of the plastic housing, so that the loads occurring during the encapsulation process due to the pressure build-up occurring during the encapsulation or encapsulation and the thermal or subsequent occurrences that occur later induced expansion processes of the encapsulation compound are kept away from the electrical components and / or the sensor element. Damage caused by such loads is thus at least largely avoided.
• the manufacture of the device is particularly simple if the inner part has one or more chambers in which the electrical components and / or the sensor element are arranged, the chambers being closed by the covers to the outside of the inner part and encapsulated or encapsulated by the plastic housing are.
• the covers can be lids that close the chambers.
• a trouble-free flow of the plastic when overmoulding or casting around the inner part is achieved in that the covers have an outer contour, which in the installed position of the Cover corresponds at least largely to the outer contour of the inner part surrounding the chamber.
• the covers can be held on the inner part in their installed position by means of a snap-in connection.
• the components and the assembly effort are reduced if the cover and the inner part consist of a plastic and the cover is connected to the inner part at one of its edge regions by means of a film hinge.
• the conductor tracks are formed by a stamped sheet metal part (leadframe) and the electrical components and the sensor element are welded or soldered to the conductor tracks.
• the sensor element can be a Hall element, which is arranged on the end region of the conductor tracks opposite the plug contacts.
• Figure 1 shows a speed sensor in section
• Figure 2 is a view of an inner part of the speed sensor of Figure 1 with open chambers
• FIG 3 is a perspective view of the inner part of Figure 2 with a covered chamber.
• the speed sensor shown in the figures is used to detect the speed of a magnetically coded wheel, not shown, by generating corresponding pulses.
• the speed sensor has an inner part made of plastic, which is arranged in a plastic housing 2 by injection molding with a plastic injection compound.
• the inner part 1 has in its interior conductor tracks 3, which are designed as stamped sheet metal parts and on which electrical components are arranged by welding. These electrical components are located in a chamber 12 which is formed in the inner part 1.
• the one ends of the conductor tracks 3 project into a plug receptacle 5 of the plastic housing 2 and form plug contacts 6.
• a Hall element 7 is also arranged by welding, which is also located in a chamber 13 of the inner part 1. .
• the plastic housing 2 has a one-piece injection-molded mounting flange 8 with an injected metal bushing 10 having a mounting hole 9.
• the chamber 12 is closed by a cover 14 made of plastic, which has an outer contour, which in the illustrated installation position of the cover 14 corresponds to the outer contour of the inner part 1 surrounding the chamber 12.
• the chamber 13 is not yet closed by a cover.

Landscapes

• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Transmission And Conversion Of Sensor Element Output (AREA)
• Measuring Fluid Pressure (AREA)
• Injection Moulding Of Plastics Or The Like (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=34962626

Family Applications (1)

Country Status (6)

Families Citing this family (12)

Family Cites Families (13)

• 2004
  • 2004-04-19 DE DE102004018869A patent/DE102004018869B4/de not_active Expired - Fee Related
• 2005
  • 2005-03-18 KR KR1020067023837A patent/KR20060135951A/ko not_active Application Discontinuation
  • 2005-03-18 CN CN2005800104758A patent/CN1997898B/zh not_active Expired - Fee Related
  • 2005-03-18 WO PCT/EP2005/051266 patent/WO2005101027A1/de active Application Filing
  • 2005-03-18 US US11/578,984 patent/US7463019B2/en not_active Expired - Fee Related
  • 2005-03-18 EP EP05729687A patent/EP1738180A1/de not_active Withdrawn

Non-Patent Citations (1)

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