DE102004043156A1 - Two- or three-stage suction manifold for internal combustion (IC) engine, comprising first helical, long torque duct and straight power duct fitted with rotary flap valve - Google Patents

Abstract

In helical torque duct is located coupled air collector. Further air collector is located radially outside torque duct, which is coupled, via aperture, to torque duct. Aperture may be stopped by flat valve. Aperture is located at transition of bend of torque duct to straight piece of duct on cylinder head of IC engine. Preferably flap valve is of rotary type, which, in open position, lies parallel to air stream from second air collector. From first air collector may extend further duct, closable by flap valve, or rotary slider.

Description

technical area

The The invention relates to a multi-stage intake system for an internal combustion engine.

State of technology

One Such intake system is for example from the MTZ engine technology Journal 60 (1999, p 14).

This Intake system is a three-stage concept, with two flaps are provided, which realize three Saugrohrlängen. The switching flaps help to make good use of the resonance effects.

While in the lower speed range, both control valves are closed, will in the middle speed range, a first switching flap opened and in the upper speed range, the second switching flap, wherein the first closed again.

The Intake manifolds curve around a common, centrally located air collector, which opened by the switching flaps or can be closed. A disadvantage of the system is that that in the upper speed range, the intake air a strong curvature must follow and therefore the adequate filling of the internal combustion engine only with big ones Intake cross sections possible is.

The Strong deflection of the power channel can also lead to increased pressure loss to lead. In addition, all must Switching elements and flaps are mounted inside the collector. This complicates the assembly of the system and leads to a high assembly cost

epiphany the invention

Of the Invention is based on the object, a multi-stage intake manifold for one Internal combustion engine of the type mentioned in such a way that the pressure loss of the power channels by a possible straight leadership is minimized, and simplifies the assembly of the switching elements becomes.

These The object is solved by the features of independent claim 1.

Of the significant advantage of the invention is that in the high speed range the internal combustion engine, the intake air is not from the inner air plenum over the Detour through parts of the curved Torque channel must be removed, but from an additional Air collection of the streamlined arranged is. Thus, the intake air almost straight line of the internal combustion engine supplied become.

There is also through the, outside the torque channel arrangement provided the advantage that for the circuit or for the adjusting mechanism switching elements can be applied, the be mounted in a simple manner. According to one embodiment of the invention is the flap to open of the power channel a wing-shaped Flap, which runs parallel to the air flow as soon as they are in the Open position is. It does not hinder the air flow and produces no or only minimal turbulence.

In a further embodiment is provided, the torque channel to be provided with a switching flap or a rotary valve. Conveniently, this arrangement is provided approximately halfway along the length of the channel. This gives you the opportunity to create a three-stage intake system. In a first stage in the lower speed range, the engine on the long torque channel supplied with air. Both flaps or rotary valves are closed.

In a second stage in the medium speed range is the flap or the rotary valve on the torque channel open and the internal combustion engine will over this central channel section supplied with intake air.

in the upper speed range, the flap for the power channel is open, so that the internal combustion engine from the additional air collecting space and Of course also through the other open channels is supplied with intake air.

According to one Another embodiment of the invention, the intake system for an internal combustion engine in V-shaped Arrangement can be used. In this case, the intake system between the cylinder banks arranged and designed symmetrically to the cylinder banks.

Of the second air collection room for the power channel is at the top of the overall system. In an advantageous manner Way, the second air plenum is via a supply channel supplied with intake air. This supply channel is on or arranged on both end faces of the intake system and connects the inner or first air collecting space with the second.

These and other features of Favor Developing the invention except as apparent from the claims also from the description and the drawings, wherein the individual features in each case alone or to be implemented in the form of sub-combinations in the embodiment of the invention and other fields and advantageous and protectable Represent embodiments for which protection is claimed here.

Short description the drawings

The The invention will be explained in more detail with reference to embodiments.

It shows

1 the section through a two-stage variant of an intake system

2 the section through a three-stage variant of an intake system

3 an intake system with open power collector

4 a suction system in perspective with closed power collector.

Embodiment (s) of the invention

This in 1 shown multi-stage intake system is arranged on a here indicated by a dashed line cylinder head of an internal combustion engine. It consists of a housing 10 , which is constructed for example in multi-shell technology. Inside the case 10 there is an air collection room 11 , in which the intake air - controlled by a throttle valve - flows. A first torque channel is arranged in a spiral around the air collecting space 12 that is with the opening 13 into the air collection room 11 extends. The through the torque channel 12 flowing air passes right side into the tailpipe 14 of the intake system and from there according to the arrow 15 to the respective combustion chamber of the internal combustion engine.

Above the torque channel 12 there is a second air collection room 16 , This air collection room 16 stands with the lower air collection chamber 11 in connection, this connection will be shown later. The upper air collection room 16 can through a flap 17 be opened or closed and indeed to the tailpipe 14 out.

This flap is open in the position shown here. Thus, intake air flows according to the arrows 18 . 19 in the direction of the internal combustion engine. Due to the design of the flap 17 There is no turbulence in the air. In essence, the air can be supplied without valve obstructions of the internal combustion engine.

Of course, despite the open flap 17 over the torque channel 12 Intake air supplied, this is only of minor importance here.

About the shift linkage 20 will shut up 17 open or closed. The shift linkage 20 is on a common wave 21 arranged. All the flaps of an intake system for a multi-cylinder engine can be opened or closed via this common shaft.

2 shows a variant of an intake system. This is a three-stage intake system. Identical parts are provided with the same reference numerals.

In addition to the long torque channel 12 is a short channel piece 22 intended. This channel piece 22 is with a rotary valve 23 openable or closable. The channel piece 22 is located approximately in the middle region of the total length of the torque channel 12 , This means that a three-step way of working is possible.

In a lower speed range up to about three thousand revolutions become the channel piece 22 and the flap 17 be closed so that the engine receives the intake air via the torque channel.

At a medium speed range of about three thousand to five thousand revolutions of the rotary valve 23 open, so here is the filling over the channel piece 22 he follows.

In the upper speed range from about five thousand revolutions, the flap opens 17 and the full power over the air collection room 16 and the short power channel through the tailpipe 14 is formed is available.

A perspective view of the intake system is shown schematically in FIG 3 shown. The intake system is designed for a V8 engine with four cylinders on each side. The housing is without cover 24 shown, it is the individual short air ducts 25 . 26 . 27 . 28 . 29 . 30 . 31 . 32 shown by the air collection chamber shown here open 16 go out and in each case a flap 17 located.

To recognize the shift linkage 20 which is on a common wave 21 is arranged. The interior air collection room 11 is via an air duct part 33 with the upper air collection chamber 16 connected. The air guide part 33 Located on the front of the intake system and has a cross-section that is sufficiently sized for the intake air supply in the upper speed range.

4 shows in the in 3 also used perspective view of the intake system, which only with the lid 24 is completed. This cover also closes the air duct part 33 towards the top, or forms in connection with this air guide part of the inlet housing 34 to the inlet of the intake air in the upper power collector or air collection chamber 16 ,

Claims (5)

Multi-stage intake system for an internal combustion engine with a first curved torque channel and disposed within the torque channel air collecting space, which is in communication with the torque channel, characterized in that a further, radially outside the torque channel arranged, air collecting space is provided, which via an opening with the first Torque channel is in communication, said opening is closed by a flap and wherein the opening is located substantially at the junction of the curvature of the torque channel to the substantially straight portion directly on the cylinder head of the internal combustion engine. Multi-stage intake system for an internal combustion engine Claim 1, characterized in that the flap has a wing-shaped Flap is, which in the open position parallel to the air flow, which flows out of the second air collecting space, runs. Multi-stage intake system for an internal combustion engine Claim 1 or 2, characterized in that starting from the first air collection chamber another channel is provided, which can be closed with a flap or a rotary valve. Multi-stage intake system for an internal combustion engine one of the preceding claims, characterized in that the internal combustion engine is a V-shaped arrangement and arranged the intake system between the cylinder banks is, wherein it is designed symmetrically to the cylinder banks and itself the first air collecting space within the torque channels and the second air collecting space is arranged above the torque channels. Multi-stage intake system for an internal combustion engine one of the preceding claims, characterized in that the second air collecting space and the first Air collection room over a supply channel is connected to each other and this supply channel is provided on one of the end faces of the intake system.