DE2552727A1 - ELECTRICAL DEVICE IN THE ENGINE COMPARTMENT OF A MOTOR VEHICLE - Google Patents

Description

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November 10, 1975 Ka / Thu

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ROBERT BOSCH GMBH, 7 Stuttgart 1

Electrical device in the engine compartment of a motor vehicle

The invention relates to one in an engine compartment of a motor vehicle arranged electrical device with a housing surrounding the device.

Electrical devices in the motor vehicle, in particular those in the engine compartment of the motor vehicle, for example potentiometers and the like. Must be protected from moisture when their Puncture not impaired within a short time or e.g. should be completely prevented by electrolysis, icing and corrosion.

Known electrical devices installed in the engine compartment of Motor vehicles arranged; are, therefore, as possible tightly enclosed in housings, but the through-

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making mechanical and electrical connections major difficulties, these bushings can hardly be carried out completely tightly.

The invention is therefore based on the object of designing and arranging electrical devices which are to be arranged in the engine compartment of motor vehicles in such a way that impairment of the method of puncturing is largely excluded.

This object is achieved according to the invention in that at least one air line from the interior of the housing to an intake pipe of an internal combustion engine of the motor vehicle is provided.

Such a forced ventilation has, in addition to the advantage of sucking off moisture, also the great advantage that heat dissipation from electrical devices, such as resistors, semiconductor components and the like. Is given.

Further advantageous refinements and expedient developments of the invention emerge in connection with the subclaims from the following description of exemplary embodiments and from the accompanying drawings.

Show it:

Pig. 1 an electrical device that is connected to the intake manifold of an internal combustion engine via an air line,

Fig. 2 shows an electrical device which has a second air connection that leads to the open air and

3 shows an electrical device with two air lines to the suction pipe an internal combustion engine.

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In Pig. 1 shows an internal combustion engine 10 which has an intake pipe 11 which is connected to an air filter 12 via which the air required for combustion in the internal combustion engine is sucked in. In the engine compartment so close to the internal combustion engine 10 of the motor vehicle, an electrical device 13 "in the present Pail a potentiometer arranged. This potentiometer is intended, for example, the internal combustion engine can be adjusted by changing the throttle position of a throttle valve lH in the intake pipe 11, as indicated by a The housing on the electrical device 13 is provided with a bushing 16 for electrical connection lines, and an air line leads from the interior of the housing of the electrical device 13 to the intake pipe of the internal combustion engine 17 there is an air throttle 18 which prevents damage in the housing of the electrical device 13 in the event of a rare pressure flashback in the intake pipe 11 of the internal combustion engine 10. In the exemplary embodiment according to FIG r the electrical device 13 sucked off. In addition, a certain amount of heat can be dissipated via the air line 17.

A second embodiment is shown in FIG. Here, the electrical device 13 is also connected to the intake pipe of the internal combustion engine via the air line 17, the connection is expediently provided in front of the carburetor. The electrical device 13 is as in the embodiment 1 provided with a bushing 16 for electrical connection lines. The electrical device 13 is provided with a second air connection which leads to the outside via an air filter 19. Through this second air connection or via the filter 19, air is now sucked through the housing of the electrical device 13, which is then over the air line 17 into the intake pipe 11 of the internal combustion engine

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entry. In the exemplary embodiment according to FIG. 2, there is even better ventilation of the electrical device 13 than in the exemplary embodiment according to Pig. I given so that
In this exemplary embodiment according to FIG. 2, better heat dissipation from the electrical device 13 is also possible.

A third exemplary embodiment is shown in FIG. 3. The electrical device 13 is here connected to the intake pipe 11 of the internal combustion engine via the air line 17.
In addition, the electrical device is via a filter 20
and a second air line 21 connected to the suction pipe 11. Via the second air line 21 and the air line 17, air can thus be guided in the bypass through the interior of the housing of the electrical device 13, so that moisture can be sucked off there and heat can be dissipated. The air filter 20 can in the known manner, for example as
Ceramic filter be designed and also be a direct component of the electrical device 13.

The connection of the electrical device 13 to the suction pipe 11 has the advantage that the suction pipe negative pressure is variable Compensates pressure due to temperature fluctuations with largely tight device housings. The boiling point of the Water vapor is also reduced by the negative pressure. The low levels of air leakage caused by possible leaks of the device housing are not due to the constant negative pressure during operation of the internal combustion engine more annoying.

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Claims (3)

Expectations J arranged in an engine compartment of a motor vehicle electrical device, with a housing surrounding the device, characterized by at least one air line (17) from the interior of the housing to an intake pipe (11) of an internal combustion engine (10) of the motor vehicle . 2. Device according to claim 1, characterized in that the housing interior of the electrical device (13) is in communication with the outside air via a second air line, in particular via an air filter (19), 3. Device according to claim 1, characterized in that the housing interior of the electrical device (13) is also connected to the intake pipe (11) of the internal combustion engine (10) via a second air line (21). H. Device according to Claim 1, characterized in that an air throttle (18) is arranged in the air line (17) to the intake pipe (11) of the internal combustion engine (10). 709821/0182