Abstract: A component, especially a part of an intake system or an air filter, for installation under the hood of a motor vehicle has a housing with a first housing part and a second housing part that are connected to one another. The first housing part is of a two-part configuration and has a support frame and a receiving part. The support frame is supported on the second housing part. The receiving part and the support frame are secured relative to one another by a releasable connection. The releasable connection is designed such that, when an external force acts on the receiving part, the releasable connection is released and the receiving part and the support frame slide telescopingly into one another.

Abstract: A component, especially a part of an intake system or an air filter, for installation under the hood of a motor vehicle has a housing with a first housing part and a second housing part that are connected to one another. The first housing part is of a two-part configuration and has a support frame and a receiving part. The support frame is supported on the second housing part. The receiving part and the support frame are secured relative to one another by a releasable connection. The releasable connection is designed such that, when an external force acts on the receiving part, the releasable connection is released and the receiving part and the support frame slide telescopingly into one another.

Abstract: An air filter (10) for an internal combustion engine of a motor vehicle designed to transmit sound into the passenger compartment or driver area in order to inform the driver of the operating state of the engine. The air filter includes an air filter housing (11), a filter insert (26), an air inlet (12) for unfiltered air, and an air outlet (13) for filtered air. The air filter housing (11) includes a housing wall (22) in or on which at least one membrane (16) is mounted. The membrane (16) is made of a material which is more permeable to sound than the rest of the housing wall (22), so that the shape and position of the membrane can be used to achieve a desired sound generation and distribution.

Abstract: A duct or conduit section (10) for installation, in particular, in an air intake system of an internal combustion engine, in which the duct section is composed of two shells (14) which are joined by a snap connection (15). Openings located in the parting seam or joint (16) between the shells (14) are produced by recesses in the half shells. These openings each have a cross-sectional area of less than 7 mm2 and are useful for suppressing noise resulting from the air intake. As a result of the openings, vibration-inducing forces exerted on adjacent components in the engine compartment due to pulsations in the intake tube, can be minimized or avoided. Also, the quantity of additional air drawn in from the engine compartment, which is undesired because it is too warm, is decreased.

Abstract: An air filter (10) for an internal combustion engine of a motor vehicle designed to transmit sound into the passenger compartment or driver area in order to inform the driver of the operating state of the engine. The air filter includes an air filter housing (11), a filter insert (26), an air inlet (12) for unfiltered air, and an air outlet (13) for filtered air. The air filter housing (11) includes a housing wall (22) in or on which at least one membrane (16) is mounted. The membrane (16) is made of a material which is more permeable to sound than the rest of the housing wall (22), so that the shape and position of the membrane can be used to achieve a desired sound generation and distribution.

Abstract: A duct system with a throttle valve, particularly useful as an air intake duct for an internal combustion engine, in which the throttle valve is configured in such a way that in the closed position it covers only a partial region of the cross-sectional area of the duct which is to be throttled and leaves another partial region open so that air can continue to flow through the intake duct. This condition is suitable, particularly at low engine rotational speeds, to dampen the air intake noise of the internal combustion engine. When the throttle valve is positioned perpendicular to the direction of air flow through the duct, sound waves in the air intake duct of the internal combustion engine are reflected back toward the engine, and in this way an economical possibility for influencing the air intake noise results which also can be utilized to design a desired noise profile for the engine.

Abstract: An intake system 10 which can be used for cooling a battery in a motor vehicle. This intake system 10 has a raw air inlet 11, a raw air duct 12, a filter housing 13, a filter element 14, a clean air outlet 15, a clean air duct 16 and an intake air manifold 17. The filter element 14 is placed in the filter housing 13 such that the air which flows from the raw air inlet 11 through the raw air duct 12 into the filter housing 13, must pass through the filter element 14 before it reaches the clean air duct 16 to the intake air manifold 17. The filter element 14 also has a curvature by which it at least partially follows the contour of a battery box wall 18 of an adjacent battery box 19. The filter element 14 can be made curved or in multiple parts.

Abstract: An air induction device (11) for an internal combustion engine including an air filter housing (12) with an open induction tube (13) leading away from it and a supplementary induction tube (14) having a closing element, preferably in the area of its end opening (15). The closing element may take the form of a rotary flap (17) and is actuated depending on engine speed. The housing (12) and the induction tubes (13, 14) are configured in geometrical terms in such a way that at low engine rotational speeds, the housing (12) and the open induction tube (13) form a Helmholtz resonator, while the closed supplementary induction tube (14) forms a quarter-wave tube leading from the housing (12). At higher engine rotational speeds, the supplementary induction tube (14) is opened, and the overall length of the supplementary induction tube (14) is adapted so that at the higher speeds, it forms a Helmholtz resonator with the air filter housing (12) and the open induction tube (13).

Abstract: A duct or conduit section (10) for installation, in particular, in an air intake system of an internal combustion engine, in which the duct section is composed of two shells (14) which are joined by a snap connection (15). Openings located in the parting seam or joint (16) between the shells (14) are produced by recesses in the half shells. These openings each have a cross-sectional area of less than 7 mm2 and are useful for suppressing noise resulting from the air intake. As a result of the openings, vibration-inducing forces exerted on adjacent components in the engine compartment due to pulsations in the intake tube, can be minimized or avoided. Also, the quantity of additional air drawn in from the engine compartment, which is undesired because it is too warm, is decreased.

Abstract: An air duct for inclusion in the air intake tract of an internal combustion engine in which flow obstacles, especially wire-shaped flow obstacles, are arranged in the vicinity of the duct wall (21) in order to improve the acoustic characteristics of the duct. The flow obstacle may, for example, be wire strands (29). The flow obstacles are capable of decreasing the acoustic noise emitted by the air duct while maintaining a low flow resistance since the center part of the duct cross-section remains unaffected by the flow obstacles. The flow obstacles may advantageously be arranged in the discharge area of flap valves since so that the valves are prevented from whistling when they are only open a small way. In order to simplify the manufacturing and assembly costs, the flow obstacles may be disposed in the area of a flanged joint in the air intake duct.

Abstract: An intake assembly with an optimal noise level, especially an intake duct for use as the manifold of an internal combustion engine. The noise level is optimized by introducing shunt resonators (16, 18) in collecting manifold of the intake duct, which is produced using a multi-shell technique. The inserted structures (16, 18) can be adhered or welded before the shells are joined, or they can be inserted in a preexisting duct formed of previously joined half shells. The shunt resonators (16, 18) require little space and can also be used for subsequently optimizing the intake ducts in the test phase, if the initial test results are acoustically unsatisfactory.

Abstract: An intake manifold for an internal combustion engine in which the intake manifold includes at least one flange for attachment to the engine, at least two intake tube elements, and a manifold chamber communicating with the intake tube elements, the manifold chamber being subdivided by a separator or dividing element into at least two communicating compartments.

Abstract: A tube, particularly suitable for use as a part of the intake manifold of an internal-combustion engine, having an inside diameter which can be changed as a function of the operating condition of the internal-combustion engine.

Abstract: An intake air temperature control device for mixture-compressing internal combustion engines having an inlet flapper proportioning the flows of cold and preheated raw air into a duct junction and into raw air mixing duct, the flapper-adjusting wax thermostat being arranged inside a thermostat chamber into which branch flows of cold and preheated raw air are admitted through two calibrated branch inlets. A narrow annular gap through which the combined branch flows must pass assures an integrated response of the thermostat to changing temperatures and air intake speeds. A lost-motion drive connection and a biasing member produce a full-load correction of the adjusted temperature. The flapper drive members may have valve edges which cooperate with the calibrated branch inlets to open and close the latter.