WO2013141825A1

WO2013141825A1 - Engine ventilation filter

Info

Publication number: WO2013141825A1
Application number: PCT/TR2013/000082
Authority: WO
Inventors: Taskin BAGCI
Original assignee: Turk Traktor Ve Ziraat Makineleri A.S.
Priority date: 2012-03-20
Filing date: 2013-03-20
Publication date: 2013-09-26
Also published as: TR201203174A2

Abstract

The invention relates to discharging excess gas accumulated in the oil sump due to exhaust gases and unburned fuel vapour in small amounts leaking from the piston ring during normal operation of diesel engines and a system that regulates pressure within the oil sump. The present invention has been developed in order to render systems used for discharging excess air in an oil sump more efficient for engines. The purpose is to direct oil splattering during the rocker arm mechanism's motion to the oil sump by providing a wall and sending vaporised oil from the rocker arm to the oil sump in liquid form by having it travel on the said wall.

Description

ENGINE VENTILATION FILTER

Technical Field

The invention relates to discharging excess gas accumulated in the oil sump due to exhaust gases and unburned fuel vapour in small amounts leaking from the piston ring during normal operation of diesel engines and a system that regulates pressure within the oil sump.

Prior Art

An oil sump stores oil in oiling systems used for reducing friction of pistons included in the engine block during the operation of the engine. In contemporary engines, oil loss still occurs but is reduced significantly. For that matter, oils recirculate. However, since oil was not too expensive and environmental restrictions were insufficient in the past, oil loss was ignored. Consequently, continuous oil feed was required. Although this structure was not efficient due to oil overconsumption, no measures were taken against oil leakage due to the ease of oil sump design.

With the developments in technology, more efficient use of resources is required today as well as recirculating oil. Using the same oil for a long period of time, on the other hand, has rendered oil sump design problematic, since recirculated oil gets dirty and requires filtering. Furthermore, exhaust gases generated by fuel combusting in the engine block due to pressure and fuel in vapour form leak from piston rings and accumulate in the oil sump.

Oil sump ventilation is the controlled discharge of excess pressure and air in the oil sump when certain conditions are met. The pressure adjustment valve located on the ventilation filter opens connection when pressure reaches a certain level to balance the pressure by discharging excess gases from the oil sump via the suction line. However, discharging the air as it is leads to different problems. While the gas is being discharged, vaporised engine oil mixes with air, which is to be mixed with fuel, and burns together with the fuel in the engine. This significantly affects emission values, one of the most important features in diesel engine design. It also increases oil consumption contemporary designs where efficiency is crucial. It increases periodical maintenance costs and shortens maintenance time. The Purpose and Brief Explanation of the Invention

The present invention has been developed in order to render systems used for discharging excess air in an oil sump more efficient for engines. The purpose is to direct oil splattering during the rocker arm mechanism's motion to the oil sump by providing a wall and sending vaporised oil from the rocker arm to the oil sump in liquid form by having it travel on the said wall.

Definitions of the Figures Illustrating the Invention

The figures used for a better explanation of the new type of engine ventilation filter developed with the present invention and their corresponding definitions are provided below.

Figure-1: New type of engine ventilation

Figure-2: Ventilation System Diagram

Definitions of Features/Sections/Parts Constituting the Invention

The parts and sections included in the figures are enumerated for a better explanation of the new type of engine ventilation filter developed with the present invention and the numbers are listed below along with their corresponding definitions.

101. Air Cooler

102. Suction manifold

103. Air filter

104. Rocker cover

105. Engine ventilation filter

106. Turbocharger

1. Diaphragm spring

2. Diaphragm

3. Oil recovery connection

4. Air inlet connection

5. Oil splash prevention wall

6. Filter

7. Air outlet

8. Diaphragm fastening cap Detailed Description of the Invention

The new type of engine ventilation filter basically comprises a diaphragm spring (1) that determines the pressure level at which the diaphragm (2) opens to discharge air, an oil recovery connection (3) to oil sump that returns condensed oil to the oil sump, an air inlet connection (4) for transmitting the air in the oil sump to the filter configuration, an oil splash prevention wall (5) for recovering oil without being scattered that splatters during the rocker arm's operation, a filter (6) for filtering vaporised oil in the air from the oil sump and recovering it into the system, an air outlet (7) opening into the suction channel for discharging the air in the oil sump when the diaphragm (2) is open and a diaphragm fastener (8) ensuring that the diaphragm (2) returns to its previous position after it is opened.

The ventilation system used in diesel vehicles is provided basically in Figure 2. As the basic operation principle, air intake is performed by creating a vacuum in the section of the turbocharger (106) unit which functions as a compressor and the engine air filter (103). With the said air intake, engine ventilation filter (105) connection is also provided on the same circuit and engine inner pressure is balance is maintained by the generated vacuum. However, as the air filter (103) starts losing air permeability due to dirtiness, increased vacuum pressure starts drawing more air and engine oil vapour from the engine ventilation filter (105). Air from the air filter (103) and air contained in the engine pass through the turbocharger (106) and arrive at the air cooler (101) unit. After the air cooler (101), air-oil vapour mixture goes into the suction manifold (102) and enters the engine combustion cycle and burns together with the incoming fuel.

In a preferred embodiment of the invention developed in order to minimise losses in the oiling system basically for preventing wearing in the engine, an oil splash prevention wall (5) is used for preventing engine oil from splattering during the operation of rocker arm mechanism which provides fuel and air intake-outflow within the engine cylinder. The said oil splashes occur due to the rocker arm mechanism located under the rocker cover (104). A large amount of air droplets splatter in every direction as a result of valve push rods and springs' operation and oiling required for said operation in the said mechanism.

By this means, a decline in the functionality of parts that are located at where oil splashes and dries is prevented, while oil utilisation is also enhanced as splattered oil is returned to the engine and incorporated in the system. A low level vacuum is generated as the engine operates at a high rpm. The vacuum at such high value causes the diaphragm (2) to close. As a result, the ratio of oil vapour in the filter configuration increases and reaches a level so that it cannot be held by the filter (6). For this reason, in a preferred embodiment of the invention, the oil accumulated therein is sent to the lower section of the oil sump by using a hose connected to the oil recovery port (3) designed so as to incline in relation to the filter (6) mechanism. The reason for sending the oil received from the oil recovery port (3) to the lower section of the oil sump via a hose is to prevent the ventilation from being performed on this surface due to the splash on the said surface of the oil contained in the oil sump. Particularly, increased vacuum pressure at the air suction system as a result of the air filter (103) with use induced dirtiness leads to drawing more air-oil vapour from the engine ventilation filter (105). In this case, oil vapour that has entered the system will be returned to the oil sump via the recovery connection (3) so as to be stopped by the oil splash prevention wall (5) and then to recover the oil vapour that could pass the filter (6) back to the system.

The new type of engine ventilation filter may be used in motor vehicles as well as stationary diesel engines.

Claims

New type of engine ventilation filter according to the invention

• a diaphragm spring (1) that determines the pressure level at which the diaphragm (2) opens to discharge air,

• an oil recovery connection (3) to oil sump that returns condensed oil to the oil sump,

• an air inlet connection (4) for transmitting the air in the oil sump to the filter configuration,

• an oil splash prevention wall (5) for recovering oil that splatters during the operation of the rocker arm that provides fuel and air intake-outflow within the engine cylinder, without being scattered,

• a filter (6) for filtering vaporised oil in the air from the oil sump and recovering it into the system,

• an air outlet (7) opening into the suction channel for discharging the air in the oil sump when the diaphragm (2) is open, and

• a diaphragm fastener (8) ensuring that the diaphragm (2) returns to its previous position after it is opened,

and is characterised by having,

• an oil splash prevention wall (5) for preventing the oil that splatters during the operation of the rocker arm that provides fuel and air intake-outflow within the engine cylinder, from being scattered,

• an oil recovery connection (3) designed so as to incline in relation to the filter (6) mechanism for transmitting the oil accumulated when oil vapour reaches a level as the diaphragm closes (2) so that it cannot be held by the filter (6) included in the filter configuration and a hose that sends the accumulated oil to the lower section of the oil sump.

2. New type of engine ventilation filter according Claim 1, characterised by comprising a diaphragm (2) that opens when the pressure reaches a predetermined level to discharge the air in the oil sump.

3. New type of engine ventilation filter according Claim 2, characterised by comprising a diaphragm spring (1) that determines the pressure level at which the diaphragm (2) opens.