DE3126054A1 - Internal combustion engine, especially two-stroke engine with a compressor for the combustion air feed - Google Patents

Description

οβ oo ο ο β ο ο β οο ρ

ι »Ö W 0OC OO O

dr.ing. HEINRICH GElTZ patent attorney ^ sgo Karlsruhe ι, postfagh stob

811825

Applicant: Pierre Farkas

La ChapelIe Moutils

La Ferte Gaueher (Seine et Marne) France

Internal combustion engine, in particular two-stroke engine, with a compressor for supplying the combustion air

■ ** ··· ■ ·· ■ · 4

• β » Mf * I.

811 825 - 2 -

Description:

The invention relates to an internal combustion engine with an enlarged working stroke, in particular to a two-stroke engine, with · a compressor for supplying the combustion air to the working cylinders.

In internal combustion engines, it is known to fill the working cylinder in the interests of increased power output by supplying pre-compressed combustion air by means of a charging fan, hereinafter referred to as a compressor to improve. So much for the well-known, however with regard to the structural measures, refrains from the very costly principle of so-called exhaust gas turbocharging, In such engines, the compressors are connected to the internal combustion engines with the aid of an adapted transmission driven in such a way that the speed of the compressor is always proportional to the engine speed, whereby a constant increase in performance as a result of charging independently from the load.

It is unsatisfactory in such internal combustion engines that when operating at higher altitudes, given the lower density of the air to be found there, there is a

■ _ 4 -

Λ β 9 λ ο ύ ^ a ft Ό

* ta »Λ ϋ« λ

■ β O & φ Ο O

* (ν iJiOOO «

ο β ο ο * ο

«Ο $ * α β ο» β

811825 -. * ~

significant drop in performance results. The aim of the invention is to remedy these shortcomings by simple measures to remedy.

The object of the invention is achieved in that in an internal combustion engine according to the preamble of Claim 1 the compressor by means of a gear with variable translation from the internal combustion engine is driven, so that an adaptation of this transmission by setting the gear ratio accordingly the compressor performance can be made to changed operating conditions.

An expedient embodiment of the invention consists in the fact that the transmission with a variable transmission is a belt transmission with a variable effective diameter between two V-belt pulleys. is, guided V-belt is _s with one pulley on the crankshaft of the internal combustion engine and the other pulley on the shaft of the compressor.

In another embodiment of the invention, the setting of the transmission ratio of the transmission by measured values given by an altimeter or by

811825 - Stones sensor is made to measure the back pressure on the compressor measures.

Based on the attached drawing, a Embodiment of the invention will be described. In schematic views show:

1 shows an internal combustion engine with a charging compressor in a front view and

2 shows the transmission with variable transmission arranged between the crankshaft of the internal combustion engine and the compressor translation by itself in a • compared to FIG. 1 enlarged sectional view.

In the embodiment according to FIG. 1, there is an internal combustion engine I ^ shown with a working piston with a rocker arm cover 2, an oil pan 3 and a V-belt pulley 4 is provided which is received on the end of the crankshaft. about this V-belt pulley 4 and a V-belt 5, the V-belt pulley 6 is a DC alternator or an alternator, and the V-belt pulley 7 of a water pump and one Fan driven. .

The engine according to this exemplary embodiment has a carburetor 8 which is connected between the outlet of an air filter 9 and the input of a compressor 10, which is

often tr O β <*

811825 - ■ β'-

a charge fan, a charge pump or a compressor can act, is switched to via a only schematic indicated connection 11 to feed the engine cylinders .. Although in the embodiment shown, the carburetor is arranged above the compressor 10, a reverse assembly would of course also be possible. In this case it would be then an air flow carburetor is required.

Likewise, instead of an internal combustion engine equipped with a carburetor, the invention would also be used in a machine Can be used with fuel injection.

The compressor 10 is driven by the internal combustion engine 1 with the aid of a gear with a variable ratio. In the present case, it is a belt transmission with a V-belt 12, the is stretched between two V-belt pulleys 4, 13 with a variable diameter. The V-belt pulley 4 is on added to the end of the crankshaft of the internal combustion engine 1, while did "V-belt pulley 13 rotatably on the Drive shaft of the compressor 10 is seated. ·

According to Pig, 2 is on the end 14 of the crankshaft Internal combustion engine a by means of a wedge 16 non-rotatably arranged shaft part 15 with a face part 4 of the

- 7th

* ft «ft *

811825 ' _ο -. / -

'β *

V-belt pulley 4 rotatably and axially fixed. The other face part k of the V-belt pulley is axially movably guided in longitudinal grooves of the hub part 15, but is otherwise non-rotatably arranged. A control element -17 serves for the axial adjustment of the flange part ^ _2. which is fork-shaped and has a ball bearing 18 and a bell 19 on the paddling part ¹ ! attacks.

The V-belt pulley 13 received on the shaft 20 of the compressor 10 also consists of? consisting of two planar parts 13 and 13 ₂ » ^of which the planar part 13 is fixed on a hub part 21, while the planar part 13 _{2 is} guided in longitudinal grooves in the hub part and received in an axially movable manner, against the action of a return spring 22.

part

When the flange / ^ _{2 of} the V-belt pulley ¹ I is axially displaced under the action of the fork-shaped control element 17, the effective diameter of the V-belt pulley 4 changes accordingly. the diameter of the V-belt pulley 13 »which results in the

gear ratio of the belt changes ■ and therefore the drive speed of the compressor is varied ..

* C ιί Ad 4 ü ft

811825 a -V-

The fork-shaped control element 17 can by hand or automatically via an actuator depending on measured values from an altimeter or a measuring sensor are specified as a transducer, controlled, are, the sensor, for example, the dynamic pressure on the compressor measures .. The belt drive with changeable The transmission ratio can also be replaced by a hydraulic or electric drive.

The construction according to the invention of an internal combustion engine with a transmission between the crankshaft which can be changed by means of a transmission ratio the internal combustion engine and the drive shaft of a supercharger are equally possible with carburetor engines or in the case of injection engines, a reduction in fuel consumption and a reduction in exhaust gas losses, likewise an improvement in performance at high altitudes. An increase in the performance of such an internal combustion engine can also be achieved depending on the required power peaks »if depending on If such performance requirements occur, the setting the transmission ratio of the transmission between the crankshaft of the internal combustion engine and the drive shaft of the compressor takes place.

811825 - & -

VO

The compressor to be used can be a conventional charge fan, a charge pump or even a Acting compressor, especially charge pumps for slow-rotating engines, but for fast-rotating engines Motors such as aircraft engines or automobile engines, in particular charge compressors, come into consideration.

It is also possible within the scope of the invention to use two compressors connected in series, the the first priority switched compressor can be a centrifugal compressor and the second compressor can be a charge pump, see above that the centrifugal compressor already supplies the combustion air to the charge pump with a pre-compression, which for example when using such. devices at high altitudes, such as the atmospheric prupk at altitude zero is equivalent to.

Claims (4)

8II825 Patent claims: Internal combustion engine with enlarged working stroke, "in particular two-stroke engine, with a compressor for supplying the combustion air to the working cylinders, characterized, that the compressor (10) is driven by the internal combustion engine (1) by means of a gear ( ^{1 I, 12, 13) with a variable ratio.} 2. Internal combustion engine according to claim 1, characterized in that the transmission with variable translation is a belt drive with a between two V-belt pulleys (* ?, 13) »whose effective diameter is variable _s guided V-belt (12), one being Pulley on the crankshaft of the internal combustion engine (1) and the other pulley ¹ on the shaft of the Veröxchters (10) are arranged. 3, ■ internal combustion engine according to claim 1 or 2, characterized in that the setting of the transmission ratio of the transmission (^ ₉ 12, 13) is controlled by measured values predetermined by an altimeter. I iVi = * \! "Π 811825 .- ■ - ■ / - • 4 .-- 4. Internal combustion engine according to claim 1 or 2, characterized in that the setting of the transmission ratio of the transmission (Ί, 12, 13) is controlled by a sensor. Which measures the dynamic pressure on the compressor (10). ^!