DE6928209U - TEMPERATURE SENSOR WITH TEMPERATURE-DEPENDENT RESISTANCE. - Google Patents

Description

SWF special factory for car accessories Jlusta V Rau QmftH. «712 Bietigheim

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A 11 639 ΡΑΤ / j / Wi 24.3.1971

Temperature sensor with temperature-dependent resistance

The innovation concerns a temperature sensor with temperature-dependent Resistance such as is used, for example, for temperature monitoring in motor vehicles.

The temperature-dependent resistor is arranged as a sensor at the point to be monitored, e.g. in the pipe of a housing. The resistance value of this sensor is a function of the ambient temperature. The two electrical connections of the sensor are then led to a monitoring circuit, in which this resistance at a certain temperature, i.e. at a certain resistance value, triggers a stop process. Will this temperature come back to a certain level This switching process is ended.

When using a temperature sensor in a motor vehicle, there are mechanical and chemical stresses Great demands are made, since the temperature sensor is often exposed to greater accelerations and the Wind blown dust grains and water droplets bounce off the temperature-dependent resistance. Since this temperature-dependent Resistors are made of ceramic material and have fine connecting wires, should not be avoided.

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that the temperature sensors in motor vehicles are frequently damaged or even be destroyed. Encapsulation of the temperature-dependent resistor in a protective housing is ruled out, because the protective housing leads to an impermissibly high heat transfer resistance, which reduces the sensitivity of the temperature sensor significantly worsened.

It is the task of the innovation, a temperature sensor with tempera To create door-dependent resistance, particularly with regard to the use in motor vehicles against mechanical and chemical influences are protected without the sensitivity of the temperature sensor suffering as a result.

The temperature sensor with temperature-dependent resistance is characterized according to the innovation that the temperature-dependent Resistance shrunk into a plastic tube with a stiffening tube pushed over the connecting wires and that this unit is attached to a printed circuit board via the ends of the connecting wires and / or the stiffening tubes is. The shrunk-on plastic tube protects the temperature-dependent resistance from mechanical and chemical destruction. The heat transfer to the temperature-dependent resistor is guaranteed. The plastic hose only leads to a small increase in the heating constant. The ones provided with shrunk stiffening tubes Connecting wires give the temperature-dependent resistance a strength, so that auoh when driving the motor vehicle occurring acceleration forces do not damage or destroy the temperature-dependent resistor to lead.

The connection between the temperature-dependent resistor and the circuit board can be designed so that the angled resistor and the angled connecting wires with the stiffening tubes pushed on Form a U-shaped unit, the leg ends of which are each inserted into a hole in the circuit board and connected to the conductor

- 3 lanes of this circuit board are red soldered.

Since the temperature-dependent resistors have large tolerances and the control of the electrical monitoring circuit must be set to a certain operating point, is still provided according to the innovation that On the circuit board on the side facing away from the temperature-dependent resistor, a trailing resistor is attached is. The temperature sensor can use this derivation resistance can be set to the specific operating point.

According to a further development, this temperature sensor adjusted in this way is inserted into a socket-like housing, in the two Ansohlußsteoker are injected, which are inserted into holes in the circuit board and in a known manner the conductor tracks of the circuit board are soldered · In this way the temperature-dependent resistor is with the circuit board and the sliding resistor similarly mounted in the socket-like housing. The conductor tracks on the circuit board are managed in such a way that over those from the sookelartigsn Housing-led connection plug, the series connection of temperature-dependent resistance and derivation resistance can be tapped.

The side of the printed circuit board with the conductor tracks that is exposed in the socket-like housing is according to a further embodiment of the new temperature sensor is covered with a cover plate that is easy to insert over the circuit board slot-shaped recesses for the connecting wires with reinforcement carrying tubes and plastic tubing. The temperature-dependent The side of the cover plate facing the resistance also carries receptacles for inserting protective brackets, those consisting of temperature-dependent resistance, stiffening Tubes and plastic tubing overlap the unit formed. These protective covers represent another mechanical one Protective device represents the temperature-dependent

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Resistance to damage from larger foreign bodies protects. Two Sohutzbugtal valleys offset by 90 ° are sufficient, which are each at an angle of 45 ° to the self-supporting temperature-dependent resistor. The U-shaped SοhutzbUgel are with their free ends in the recordings Pressed into the cover plate.

According to a further embodiment of the innovation, the soolcel-like housing protrudes beyond the cover plate and is sealed in this area by potting compound. on In this way, all parts of the temperature sensor are protected and only the shrunk temperature-dependent resistor stands free in the room that is secured by the protective cover.

The innovation is explained in more detail using an exemplary embodiment shown in the drawing. Show it

Fig. 1 the plan view of the new temperature sensor,

2 shows a longitudinal section through the temperature sensor along the line II-II in FIGS

3 shows a cross section through the temperature sensor along the line III-III in FIG. 2.

The two connection wires 10 of the temperature-dependent resistor 14 are angled in a U-shape and reinforced with stiffening tubes 15 that have been pushed on. About the temperature-dependent resistor 14 the stiffened Ansohlußdrähte and is pulled, a plastic tube 21 which then duroh action of heat shrunk "The resistor 14, the lead wires 10 and the stiffening tube 15 then form a compact unit in which nioht more to ¹ x !? it is feared that the resistor 14 will break or a connecting wire 10 will break off.

The ends of the AnscMeMrMhte 10 and the reinforcement · - pipes 15, the tt.B. Manufactured to the massing ”are introduced into bores in the circuit board 18 and soldered there in a known manner to the conductor tracks 20 on the surface of the circuit board IB. From the underside of the printed circuit board IB , a connector 8t and 13 is inserted into receptacles in the printed circuit board IB and is also soldered to the conductor tracks 20. The conductor tracks 20 of the circuit board IS are guided in such a way that the temperature-dependent resistor 1% is connected in series with the trailing resistor 13. This unit of TEN peraturabhängigem resistance Ik, made of printed circuit board 18 and Abgleiohwiderstand ™ 13 is now set to the Abgleiohwert and then inserted into the housing sookelartige. 11 In this housing 11, two Ansohlußsteoker 12 are injected, which end in the housing in two approaches. These approaches are, as FIG. 3 shows, passed through bores 23 in the circuit board 18 and also soldered to the conductor tracks 20. The conductor tracks 20 are connected to the connector plugs 12 in such a way that the series connection of the temperature-dependent resistor 14 and the derivation resistor 13 can be tapped off at the terminal core 12 protruding from the housing 11.

The circuit board 18 is then covered by the cover plate 19, the over two Einführsohlitze for the connecting wires 10 of the temperature-dependent resistor 14 on edge can be introduced. On the side facing the temperature-dependent resistor 14, this cover plate carries four receptacles 22 for two U-shaped Sohutzbügel 17. The Protection bars 17 are pressed into the receptacles 22 with their free ends. The arrangement of the receptacles 22 is so that the two protective brackets 17 are offset by 90 ° and each at an angle of 45 ° to the cantilevered one temperature-dependent resistor 14 are available. The protective bars 17 overlap the temperature-dependent resistor 14 and form a kind of protective cage against the effects of larger foreign bodies.

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The socket-like housing 11 projects beyond the cover plate 19. The protruding area is covered with a casting compound 16 poured out so that all parts, including the Abgleiohvriderstand 13 and the circuit board 18 with the conductor tracks 20 and the soldering points, airtight and sufficient are protected.

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Claims (10)

• * · «I ·« I til · llii ι • · lit III * till I •> · · I> Ii SWF special factory for car accessories Gustav Rau GmbH., 712 Bletigheim AA 11 639 PAT / J / Vo / Wi 24.3. 1971 claims for protection 1. Temperature sensor with temperature-dependent resistance, daduroh characterized in that the temperature-dependent resistor (14) is pushed over with connection wires (10) Stiffening tubes (15) is shrunk into a plastic tube (21) and that this unit cantilevered over the ends of the connecting wires (10) and / or the stiffening tubes (15) on a Printed circuit board (18) is attached. 2. Temperature sensor according to claim 1, characterized in that the temperature-dependent resistor (14) and the angled connection wires (10) with the stiffening tubes (15) slipped on are U-shaped Form a unit whose sole ends each inserted into a hole in the circuit board (18) and with conductor tracks (20) are soldered. 3. Temperature sensor according to claim i and 2, characterized in that that on the circuit board (18) on the temperature-dependent resistor (14) turned away Side a balancing resistor (13) is attached. 4. Temperature sensor naoh claims 1 to 3 »characterized in that the circuit board (18) with the temperature-dependent Resistor (14) and the derailleur • · till I I I I I. I I resistor (13) is inserted into a socket-like housing (Ii), in which two aneohlußstooker (12) are injected are inserted into bores (23) of the circuit board (18) and in a known manner with the conductor tracks (20) the circuit board (18) are soldered. 5. temperature sensor naoh claim 4, characterized in that the conductor tracks (20) on the circuit board (18) are guided so that the series connection of temperature-dependent resistor (14) and via the connector (12) guided out of the socket-like housing (11) Derailleur resistance (13) can be tapped. 6. Temperature sensor naoh claims 1 to 5, characterized in that the side of the circuit board (18) exposed in the socket-like housing (H) with the conductor tracks (20) is covered by a cover plate (19), the recesses in the form of a sole plate for the connection = wires (10) with stiffening tubes (15) and plastic tube (21) carries. 7. Tempera turf üetl he sash claim 6, characterized in that the temperature-dependent resistor (14) facing side of the cover plate (19) supports (22) for inserting the protective bracket (17), which carries the out temperature-dependent resistance (14), stiffening tubes (15) and plastic hose (21) formed unit encroach 8. temperature sensor mach claim 7, characterized in that two 90 ° offset protective bracket (17) are provided, each dia at an angle of 45 ° to the cantilevered temperature-dependent resistor (14) stand. 9. Temperature sensor naoh claim 7 and 8, characterized shows that the protective brackets (17) are U-shaped and with their free ends in the receptacles (22) of the cover plate (19) are pressed in. 10. Temperature sensor naoh claims i to 9> thereby characterized in that the scckel-like housing (11) the Cover plate (19) protrudes and is sealed airtight in this area by potting compound (16).