Classifications

• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
  • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
  • G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
  • G01F23/24—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of resistance of resistors due to contact with conductor fluid
  • G01F23/246—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of resistance of resistors due to contact with conductor fluid thermal devices
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
  • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
  • G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
  • G01F23/24—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of resistance of resistors due to contact with conductor fluid
  • G01F23/246—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of resistance of resistors due to contact with conductor fluid thermal devices
  • G01F23/247—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of resistance of resistors due to contact with conductor fluid thermal devices for discrete levels
  • G01F23/248—Constructional details; Mounting of probes

Definitions

• Immersion probe including oil level control, associated manufacturing method and insert for the implementation of the method.
• the present invention relates to the field of immersion probes particularly in the automotive field and in particular immersion probes for controlling the oil level in a crankcase.
• the invention may be used for other applications and especially for the realization of cooling circuit temperature probes and also in other technical fields in which probes of immersion are used.
• the invention more specifically relates to an immersion probe, the associated manufacturing method and an insert for the implementation of the method.
• the essential steps of the manufacturing processes of the prior art are the securing between a resistive wire and possibly a thermistor and secondly connecting tabs, the removal of the resistive wire / connection tabs assembly. in a half-shell, securing between the connecting tabs and the connector via connection wires and fixing the second half-shell on the first.
• FIGS. 1 and 2 An example of immersion probe obtained by the implementation of such a method of the prior art is illustrated in FIGS. 1 and 2 in which there is found a resistive wire 1 'and a thermistor 2', both of which are welded to connecting tongues 3 ', they themselves even electrically connected to connection wires 4' connected to the connector 5 'and secondly fixed in translation in the 6 'half-shell for receiving by locking means 7'.
• the manufacturing process commonly used is semi-automatic and does not achieve high production rates given the large number of parts to be welded namely of the order of a dozen welds.
• the manufacturing method also has reliability problems due to the laying of the resistive wire 1 at the beginning of the process and to solder defects between the connection tongues 3 'and the connection wires 4'.
• the purpose of the present invention is to propose a method for manufacturing an immersion probe, in particular for controlling the oil level, making it possible to automate the manufacture of an immersion probe and to limit the number of operations in particular. welding to perform.
• the present invention also aims to provide a manufacturing process having increased reliability and lower manufacturing costs.
• the present invention relates to a method for manufacturing an immersion probe, in particular for controlling the oil level, characterized in that it comprises:
• the method makes it possible to limit the number of welding by the use of an insert providing the electrical connection between the resistive wire and the outside.
• the method can further be fully automated.
• the insert comprises at least two parts, defining conductive tracks, the parts being connected by breaking parts, the insert further comprises connecting tabs adapted to allow fastening with a resistive wire, and connection plugs. which can be mounted in a connector.
• the insert makes it possible to constitute without additional part the electrical circuit between the resistive wire and the connector.
• the placement step is performed by positioning the metal insert at the support parts in the mold;
• the step of breaking the break pieces is carried out during the closure of the mold by cutting means
• the cutting means are integrated in the mold; a thermistor bonding step is made with the connecting tabs of the metal insert;
• the step of connecting the resistive wire with the connecting lugs of the metal insert is obtained by applying a heating support
• a step is made to cut the free ends of the resistive wire connected to the connecting lugs by means of a wire cutter;
• the assembly step between the connection plugs of the metal insert and the connector is performed before the overmolding step.
• Another object of the invention is an insert for the manufacture of a probe, characterized in that it comprises at least two parts defining conductive tracks connected by break pieces, connecting tabs adapted to allow subjection with a resistive wire, and connection plugs adapted to be mounted in a connector.
• Another object of the invention is an immersion probe obtained by implementing the method.
• FIG. 1 is a diagrammatic sectional view of an example of a dip probe of the state of the art
• FIG. 2 represents, in a second perpendicular view, the immersion probe of FIG. 1,
• FIG. 3a represents an exemplary embodiment of an insert according to the invention
• FIG. 3b represents an insert disposed in a mold
• FIG. 4 represents a sectional view of the mold and the insert
• FIG. 5 represents an insert molded with the connector
• FIG. 6 represents the securing step between the resistive wire and the insert
• an insert 8 is shown, this insert 8 has connecting lugs 9 for receiving the resistive wire 1 and the connection plugs 10 for assembling the insert 8 on the connector 5.
• the insert 8 comprises in the embodiment example three parts 11 defining three conductive tracks 11, these parts 11 are connected by break pieces 12.
• the conductive tracks 11 correspond to the supply of the resistive wire 1, to the power supply of the thermistor 13 and to the ground common to the resistive wire 1 and to the thermistor 13.
• the insert 8 may comprise a different number of conductive tracks 11 and in particular two when the probe 20 does not include a thermistor 13.
• the rupture pieces 12 make it possible to pass from an insert 8 made in one piece and therefore able to be easily manipulated and positioned in the mold 14 to an insert 8 in several parts 11 allowing the realization of the electric circuit.
• the insert 8 is advantageously made from a single metal plate, the break pieces 12 being obtained by reduced thicknesses of material or by pre-cuts during the manufacture of the plate.
• the insert 8 will be made in a standardized manner and then cut according to the dimensions of the probe 20 to which it will be intended.
• the mold 14 comprises integrated cutting means 17 arranged in such a way that the closing of the mold 14 causes the rupture piece 12 to rupture and consequently allows the parts 11 to be separated from each other and forming the electrical circuit providing the connection between the resistive wire 1 and the thermistor 13 and the connector 5.
• the profile of the mold 14 also makes it easier to receive and position the insert 8 for this purpose.
• the lower mold footprint 15 comprises support parts 18 of the insert 8.
• These support pieces 18 advantageously take the form of a plate disposed at the location provided for the resistive wire 1 and a notch disc disposed in the lower cavity 15 of the mold 14 and whose notches correspond to shapes complementary carried out on the insert 8.
• the insert 8 is assembled with the connector 5, for which purpose the connection plugs 10 of the insert 8 are pushed into the corresponding female part 19 of the connector. 5.
• the method then consists in molding the insert 8 to obtain an insert 8 molded with a connector 5 and as shown in FIG. 5.
• the method then consists in making the connection between the connecting lugs 9 and the resistive wire 1.
• the welding is performed at the end of the process so that the weld is subject to little external constraints.
• This welding is carried out by applying a heating support 21 as illustrated in FIG. 6 so as to weld the resistive wire on the connection tabs 9.
• the free ends are then cut off, to this end a space is provided for passing a wire cutter 22. In this way, an immersion probe 20 is obtained as shown in FIG. 7.

Landscapes

• Physics & Mathematics (AREA)
• Thermal Sciences (AREA)
• Fluid Mechanics (AREA)
• General Physics & Mathematics (AREA)
• Measuring Temperature Or Quantity Of Heat (AREA)
• Thermistors And Varistors (AREA)
• Manufacturing Of Electrical Connectors (AREA)
• Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

Family

ID=42136090

Family Applications (1)

Country Status (5)

Citations (5)

Family Cites Families (3)

• 2009
  • 2009-10-01 FR FR0904687A patent/FR2950967B1/fr not_active Expired - Fee Related
• 2010
  • 2010-09-22 EP EP10769015A patent/EP2483645A1/fr not_active Withdrawn
  • 2010-09-22 CN CN2010800545338A patent/CN102639975A/zh active Pending
  • 2010-09-22 JP JP2012531475A patent/JP2013506826A/ja active Pending
  • 2010-09-22 WO PCT/FR2010/051980 patent/WO2011039448A1/fr active Application Filing

Patent Citations (5)

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