Internal-combustion engines – Charge forming device – Heating of combustible mixture
Patent
1998-05-05
1999-06-29
Kamen, Noah P.
Internal-combustion engines
Charge forming device
Heating of combustible mixture
123556, F02M 3100
Patent
active
059153660
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a device for regulating the temperature of the intake air in an internal combustion engine
Such devices, as have become known from German Patent 15 26 662, for example, are simple in construction and accordingly inexpensive to produce. The wax thermostat constitutes a regulating means with sufficient power and adequate stroke length for its intended purpose.
A disadvantage of this apparatus, however, is to be seen in the fact that all of the components are disposed in the duct for the cold air or mixed air, resulting in increased resistance to flow. An effort is therefore made to streamline the flow device and avoid the use of large parts.
German Offenlegungsschrift discloses a device which is contained in a shunt duct. Mixed air flows around this device, but here again the mixed air has to overcome considerable flow resistance.
U.S. Pat. No. 4,340,172 furthermore discloses a device for regulating the temperature of the intake air in an internal combustion engine. This one is also situated largely in the mixed air duct and from there it controls two flaps arranged parallel and operating contrariwise.
A disadvantage of this device is to be seen in the fact that the mixed air encounters considerable resistance to flow. Moreover, on the basis of the principle of its design, both a restoring spring is necessary for the wax thermostat as well as an overtravel compensation spring and a restoring spring for the control valve.
The restoring spring for the wax thermostat and the overtravel spring are concentric inside of one another. A disadvantage of this arrangement, however, is that here the diameter of the device is very greatly increased and therefore, again, the flow properties are very greatly affected.
SUMMARY OF THE INVENTION
The invention is addressed to the problem of avoiding the described advantages and creating a device for regulating the temperature of the intake air in an internal combustion engine which can be arranged in the intake duct in a streamlined and reliably operating manner.
This problem is solved by the features recited in the appended claims.
The important advantage of the invention is that, through the arrangement of the overtravel spring on the control flap, a very slender design of the entire device is achieved. Furthermore, the overall length of the device can be shortened, since the overtravel spring is disposed, not ahead of the point where the pull rod is fastened to the control flap, but behind the point where the pull rod is fastened to the control flap.
A further advantage also lies in the fact that no additional closing spring is needed for the control flap for the purpose of preventing the control flap from fluttering.
According to an embodiment of the invention, the longitudinal guide has a hook which is disposed on the control flap. The pull rod engages this hook. This hook is at the same time a point of contact for a 3 which is disposed in the longitudinal guide. In the normal position the sliding element lies thus at the one end in the eye of the hook and at the other end on the longitudinal guide.
In another embodiment of the invention the control flap is provided with a so-called "air damping member." This is a substantially hollow cylindrical projection which extends into the warm-air duct and steers the air stream close to the closed position.
In another embodiment of the invention the pull rod, which at one end is disposed on the wax thermostat and at its opposite end is mounted in a guide affixed to the housing. This guide can simply be a bore through which the pull rod is passed.
The hook for the pull rod and the pusher is open on one side, the opening angle being limited so that any over-stroke will be able to move the pusher along the guide only if the control flap is entirely closed. This has the advantage that the entire device operates without trouble, i.e., any tilting or blockage of the control flap and any positioning error due to premature starting of the overtravel, will be prevented.
In an advanta
REFERENCES:
patent: 3801078 (1974-04-01), Denton et al.
patent: 4565176 (1986-01-01), Alf et al.
Andress Heinz
Ropertz Peter
Filterwerk Mann & Hummel GmbH
Kamen Noah P.
LandOfFree
Device for regulating the intake air temperature in an internal does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Device for regulating the intake air temperature in an internal , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Device for regulating the intake air temperature in an internal will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1366890