DE2161050C3 - Device for regulating the crankcase pressure on an internal combustion engine - Google Patents

Description

voltages by a pressurized exhaust gas

Control spool can be controlled. rur

With the device according to the invention, it is 1

The invention relates to a device for regulating the crankcase pressure both in dependence

development of the crankcase pressure on an internal combustion engine from the negative pressure in the air intake pipe as well as en

machine with closed crankcase, in which, depending on the pressure of the exhaust gases in the exhaust 11

in the gas line from the crankcase to the air intake pipe. This has the advantage that with a

renden vent line a control valve arranged extreme operating conditions of the internal combustion engine Lc

is, the control piston of a pressurizing machine, such as in engine braking mode, oil

th membrane is actuated. 65 was another opening due to the pressure of the exhaust gases

It is known (US Pat. No. 3,473,521) to be opened and thereby a larger amount ^wil

Control of the crankcase pressure at the machine leak gases are discharged from the crankcase ^{and un}

The housing of an internal combustion engine can have a control valve. It can therefore be used for normal operation

M. ^{3 4}

I; set and kept constant, low overpressure axially offset to the control piston5 is a control

I ″ in the crankcase itself in operating areas, guided in the slide 18 in the cylinder 4, depending on the

|| NEN high leakage gas quantities in the crankcase due to the operating conditions of the internal combustion engine

| i len, are adhered to. Control openings 16, 17 closes. The control slide

fi So that the 5 bcr 18 flowing through the bypass line is connected to a control piston 19 on

§3 exhaust gases cannot escape into the open, its free piston surface 20 opens the exhaust gas pressure and

f? the bypass line behind the control valve in the to on its piston ring surface 21 between the

The vent valve housing 3 and the piston ring surface 21 are provided in the line part leading into the air intake pipe

iy management. seen spring 22 acts. The control piston 19 is

For a structural simplification of the device io guided in a special cylinder 23, which is detachable

^ It is advisable that the bypass line is connected to the valve housing 3 within the. The cylinder

U to arrange valve housing and in two, in one 23 has a bore 24, one to the exhaust pipe

; * j line running parallel to the cylinder is connected.

S sections to subdivide the openings to the The force of the spring 22 is such that at

The ventilation line is connected. For a full load operation of the internal combustion engine, the spring

ί · such an expansion of the bypass line in the valve force is equal to or slightly greater than that in this

In the housing, it is also advantageous if the exhaust gas condition of the exhaust gases on the free piston

pressure applied control slide and the force caused by the surface 20.

V diaphragm connected control piston jointly in The mode of operation of the device for regulation

are guided by a cylinder of the valve housing. 20 of the crankcase pressure is as follows:

The line sections of the bypass line are at a standstill. The internal combustion engine is at a standstill

via control openings in the cylinder in connection, which the control piston 5 and the control slide 18 in

depending on the operating state of the internal combustion engine, the position shown in the drawing. the

through the control bores 10 to which the exhaust gas pressure acts and the control openings 16, 17

gate valve can be released or locked. The 25 are locked.

Control slide is expedient with a control piston only builds up when the internal combustion engine is in operation ben connected, on the free piston surface of the in the crankcase by the exhaust gas pressure from the combustion and on the piston ring surface of the space passing by the piston blow-by gases Spring pressure one between the valve body and pressure on. Since the pressure chamber 9 via a line the piston ring surface provided spring acts. 30 is connected to the crankcase, prevails in the Since an additional control pressure chamber 9 has the same pressure as in the crankcase for aggregate motors, tion of the crankcase pressure as a function of as long as the pressure of the crankcase is below the Exhaust gas pressure is not necessary, if atmospheric pressure is appropriate, the control drills remain The control piston acted upon by the exhaust gas pressure is closed by the control piston 5 in gene 10. Only when guided by a special cylinder, which can be detached with 35 the crankcase pressure and thus the pressure in the is connected to the valve housing. This has the pre-pressure chamber 9 is greater than atmospheric pressure, part that the same for vehicle and aggregate engines, the membrane 6 is raised and pushes the Valve housing can be used. Control piston with upwards. The control edge of the In the figure is an embodiment of the control piston S is part of the cross section of the Invention shown. 40 control bores 10 free through which the blow-through gases can flow from the crankcase to the air intake pipe to the air intake pipe. Leading here Vent line 2 is a control valve 1 by the pressure in the crankcase, and the falls built-in. The control valve 1 has a valve housing 3, the control piston 5 closes the control bore again in which a cylinder 4 10 is concentric to the longitudinal axis. Depending on the size of the crankcase pressure is arranged. In the cylinder 4, a control piston 45 from the control piston 5 is more or less large ben 5 guided, the cross-section of the control bores 10 connected to a membrane 6 released, is. The membrane 6 is in a special housing over which a differently large amount of blow-through part 7 of the valve housing 4 housed, the gases can flow to the air intake pipe. This öff cavity from the diaphragm 6 into two different opening and closing movements of the control piston 5 Pressure chambers 8 and 9 is divided. The pressure 50 repeats itself continuously depending on the size of the crankcase 8 is housing pressure via a hole with the atmosphere.

and the pressure chamber 9 via a control bores 10, not shown, as well as the ventilation duct bore and a connected line with the lines2 are dimensioned so that the various Crankcase connected. Amounts of blow-through gases from normal operation. The ventilation line 2 becomes the air intake pipe in the valve housing 3 55 area of the internal combustion engine interrupted by the cylinder4, which can be carried off without a larger one : tion of the blow-through gases control bores 10 has. Overpressure occurs in the crankcase. One he-Im Valve housing 3 is a bypass line 11 to earth the desired slight overpressure in the crankcase The control bores 10 of the cylinder 4 are reached by the weight of the control piston 5. % Vent line 2 branched off. The bypass line 60 in the usual alternating load operation of the internal combustion engine ; 11 will remain within the valve housing 3 by two in the machine, the control openings 16, 17 through the ; ■ a plane parallel to the cylinder 4 running control slide 18 closed, since the on the KoI- ; i line sections 12 and 13 formed, the exhaust gas pressure over benfläche 20 is less than that If openings 14, 15 are attached to the vent line 2, spring force of the spring 22.

J are closed. These line sections 12, 13 are 65

like the vent line 2. closed by the cylinder4 flap) prevail on the top of the piston

if interrupted, which, however, causes high pressures to connect to the side of the internal combustion engine

the line sections has control openings 16,17. accumulating exhaust gases. As a result of the high pressure on

At the top of the piston, a larger amount of exhaust gas flows past the piston into the crankcase. The pressure in the crankcase increases sharply due to the larger amount of blow-through gases. The control piston 5 opens Via the membrane 6, the control bores 10 completely. Since the cylinder 23 is connected to the exhaust pipe is, acts on the free piston surface 20 of the control piston 19 of the high exhaust gas pressure in the exhaust pipe. The control piston 19 is moved against the spring force, and the control slide 18 opens the Control openings 16, 17. Via the bypass line 11, part of the blow-through gases can now also be used Drain the suction pipe. The pressure in the crankcase drops and the control piston 5 can continue to hit regulate the different pressures in the crankcase. As long as the exhaust pipe remains closed the control slide 18 holds the control openings 16 17 open. When the engine is braking, that's the cure bel housing permanently connected to the air intake pipe via the bypass line. After finishing de: Engine braking operation, the pressure in the exhaust pipe falls, and the control slide 18 is through di < Force of the spring 22 returned to the position seen from the drawing. The control of the cure Belgehäusedruckes is now via the control piston 5 and the diaphragm 6.

1 sheet of drawings

Claims (7)

to be arranged, which is connected to the crankcase via an opening. This opening is controlled by a piston in the K, which is driven by a piston rod First means being connected to control the crankcase with a membrane, the two rudder "- \ _s sedruckes _t of an internal combustion engine with overall 5 th has the piston rod facing away Meuer- Di schlossenem crankcase in the is the page about a control line is connected to the intake manifold Abga crankcase leading to the air intake manifold of the internal combustion engine. In addition, the b vent line is a control valve, a closing spring acts on this control side. From the air whose control piston from a pressurized other control side of the diaphragm leads to a behavior? th diaphragm is actuated, thereby reducing the size of the suction line to the suction line, indicating that there is one of the vent pipe of the internal combustion engine in the area of the emzel unit (2) in front of the control valve (1) . Bypass lines, line distributions are connected. At vent (11) branched off, the control orifices of different pressure in the control and in the exhaust (16, 17) through a suction line of the exhaust gas pressure opens the piston so that the leakage gases can be seen. struck control slide (18) can be controlled. 15 of the crankcase drawn off via the suction line 2. Device according to claim 1, thereby being countered. * "R indicates that the pressure is applied to the exhaust gas. It is also known (Swiss patent house hit the control slide (18) and the one with the writing 224 277) in the intake manifold of an internal combustion engine Membrane (16) connected control piston (S) machine transversely to the direction of flow of the intake air Men to arrange a pipe together in a cylinder (4) of the valve housing, which pipe is inside the intake pipe ses (3) are performed. res has an opening in the direction of flow, D 3. Device according to one of claims 1 which can be controlled by a slide. The above and 2, characterized in that one end of the bypass pipe is out of the suction pipe ^; Line (11) behind the control valve (1) runs into the and opens into a collecting container, which opens through the line part of 25 leading to the air intake pipe via an opening with the crankcase of the ventilation line (11). Internal combustion engine is connected. The one in the Kurbeige ^Sleu 4. Device according to Claims 1 to 3, the gases produced by the housing are mixed in with suction air arranged through the pipe and ben, characterized in that the bypass line is added to the opening in the region of the suction pipe of the An ^Ab S (11) inside the valve housing (3). ^ is and consists of two in a plane parallel to the 30 It is finally still known (German Ge the cylinder (4) running line sections utility model 1 916 571), on the valve cover of a ^D (12, 13), which has openings ( 14, IS) to attach a ventilation pipe to the internal combustion engine ^run i: the ventilation line (2) are connected. and to lead into the air filter. In front of the air filter is exhaust 5. Device according to one of claims 1 from the vent line a branch line branching off to 4, characterized in that the line 35 leads, the mün- ^einc sections (12, 14) behind the carburetor in the intake pipe through control openings (16, det . the opening of the branch pipe in the suction pipe which 17) scehen in the cylinder (4) in connection which is controlled by a valve which is acted upon by the throttle ^te1 '· from the exhaust pressure control slide valve in the carburetor is operated. ^Ven (18) depending on the operating state of the internal combustion engine. In the known devices, the crank machine is released or shut off 6. Device according to one of claims 1 controlled in the intake pipe. This has the disadvantage that '' to 5, characterized in that the control valve (18) machine with a control piston (19) in extreme operating conditions of the internal combustion engine, e.g. in engine braking ^{mode, due to a} f, on the free piston surface (20) of the high gas pressure on the piston top the in ⁽ the exhaust gas pressure and on its piston ring surface 45 resulting large amounts of blow-through ^at 8 (21) the spring pressure between the valve gases in the crankcase no longer effectively could be performs b ^s housing (3) and the piston ring surface (21) superiors ", and thereby the pressure in · ^is provided spring (22) acts. crankcase überuwj-Mg rises high. ^SCTE 7. Device according to one of claims 1 The inventors »_.ü: <- and the task lying down Hol bis6, characterized in that the control 50 is therein, the bc ^; . In order to improve the devices of the single-Dn piston (19) in a special cylinder (23) called » * .r * ^{.. that their rough} guidance, which is detachable with the valve housing (3), avoids disadvantages ■. ·· ? rJen. ^{unc is} connected. The object is achieved according to the invention in that B ° ' that of the vent line in front of the control valve Ku 55 a bypass line is branched off, the control opening of which I