CN205277533U - Ventilation system for automobile crankcase - Google Patents

Abstract

The utility model relates to an automobile crankcase ventilation system. In order to solve the problems of large layout space, high implementation difficulty and high cost, the utility model comprises a cylinder cover connected with the crankcase and an intake manifold located on one side of the cylinder cover. It is characterized in that an external oil-air separator is provided on the cylinder head cover, and the oil-air separator is connected with the intake manifold through a ventilation pipe. One end is connected to the hose after the air filter at the outer end of the intake manifold; the oil-gas separator includes a diaphragm PCV valve; a one-way valve is provided in the air supply pipe assembly. It prevents the gas inside the cylinder head cover from flowing back to the hose after the air filter, effectively avoiding the phenomenon of icing and oil emulsification; the overall structural layout is flexible, the space requirement is low, it is easy to implement, and the cost is low.

Description

An automobile crankcase ventilation system

technical field

The utility model relates to the technical field of automobiles, in particular to an automobile crankcase ventilation system.

Background technique

The crankcase ventilation system of the engine is a way to introduce the exhaust gas remaining inside the engine during the combustion process into the intake system, and at the same time introduce fresh air into the crankcase for gas exchange, so as to perform in-cylinder combustion again and prevent incomplete combustion The exhaust gas deteriorates the oil in the crankcase, which is a structure to improve combustion and emissions. In some extreme environments and working conditions, first, because the internal pressure of the cylinder head cover (connected to the crankcase) is greater than the pressure in the hose after the air filter, the gas inside the cylinder head cover (connected to the crankcase) flows to the hose after the air filter, and the There will be water vapor freezing and oil emulsification; secondly, due to the use of needle valves or some slow-response PCV valves, the flow rate of the ventilation pipeline is low, and water vapor will freeze and oil emulsification will also occur.

The icing phenomenon of the crankcase ventilation system may lead to pipeline blockage, resulting in excessive internal pressure of the crankcase ventilation system, damage to the seals and leakage, etc. The emulsification of the engine oil will affect the lubrication of the moving parts, and it is easy to cause shaft holding and pull. damage the engine. The existing technical solutions are generally: design resistance heating equipment (such as antifreeze box) around the ventilation pipe and air supply pipe, add heat preservation sheath or design HVAC water pipe, etc.

For example, the patent publication number is CN202851107U. The automobile crankcase ventilation anti-icing system disclosed by the utility model comprises a crankcase ventilation pipe and a clean air pipe, an antifreeze box is arranged between the crankcase ventilation pipe and the clean air pipe, and the antifreeze The inlet of the box communicates with the crankcase ventilation pipe, and the outlet of the antifreeze box communicates with the pipe side wall of the clean air pipe. The utility model designs an antifreeze box between the engine's forced crankcase ventilation pipe and the clean air pipe, thereby realizing the storage of condensed water in the antifreeze box, thereby preventing forced crankcase ventilation from freezing, and the system The overall structure is simpler and the cost is low.

CN201826925U Zhejiang Geely Automobile Research Institute Co., Ltd., the utility model provides an automobile crankcase ventilation system, which belongs to the technical field of automobiles. It solves the problem that the existing engine air intake system is prone to condensation and blockage, and even the engine cannot be started. The crankcase ventilation system of the automobile includes a throttle valve and an intake manifold. The air filter is connected with the throttle valve, the intake manifold and the crankcase through the breather pipe. A one-way solenoid valve for exhausting the exhaust gas in the crankcase. There is a one-way solenoid valve for supplementing the air pressure inside the crankcase between the crankcase and the air pipe connected to the air filter and the throttle valve. There is also a one-way solenoid valve on the crankcase for measuring the crankshaft. The pressure sensor for the internal pressure of the tank, the pressure sensor and the one-way solenoid valve are all connected with an electronic control unit. The crankcase ventilation system of the automobile can prevent the oil-air mixture in the crankcase from flowing backward into the wave tube and condensing, causing the throttle valve to be unable to open, the air intake to be unsmooth, and the vehicle to be started.

Contents of the invention

The purpose of this utility model is to solve the problems of the prior art on the icing phenomenon processing device of the crankcase ventilation system, which have high requirements for electrical and mechanical layout, large layout space, difficult implementation, and high cost. Provided is an automobile crankcase ventilation system which avoids icing and engine oil emulsification, takes up little space and has low cost.

The above-mentioned technical problems of the utility model are mainly solved by the following technical solutions: a crankcase ventilation system for an automobile, comprising a cylinder head cover connected to the crankcase, and an intake manifold located on one side of the cylinder head cover. The above-mentioned cylinder head cover is provided with an external oil-air separator, and the oil-air separator is connected to the intake manifold through a ventilation pipe. The other end is connected with the air-filtered hose at the outer end of the intake manifold; the oil-gas separator includes a diaphragm PCV valve; a one-way valve is arranged in the air supply pipe assembly. The technical solution is equipped with a diaphragm type PCV valve, which has fast response, high working frequency, fast air flow in the pipeline, and low proportion of gas and water vapor in the pipeline, effectively avoiding the problems of icing and oil emulsification. Standardize the size design of the inner diameter and length of the pipe joint in the air supply pipe assembly to control the flow-pressure loss of the air supply pipe assembly, and at the same time control the operating frequency of the diaphragm PCV valve so that it can work within a stable range and avoid abnormalities. ring. The flow-pressure loss of the one-way valve is smaller than that of the pipe joint, so that the air supply pipe assembly is mainly controlled by the pipe joint. The one-way valve prevents the gas in the cylinder head cover from flowing reversely to the hose after the air filter to avoid freezing and oil emulsification. Through the above solution, the existing engine crankcase ventilation system is easy to freeze, the engine oil is emulsified, and even the problems that the engine cannot be started are solved, and the space requirement is small and the cost is relatively low.

Preferably, the air supply pipe assembly further includes a pipe joint, an air supply pipe one connected to one end of the pipe joint, the air supply pipe one connected to one end of the one-way valve, and the other end of the one-way valve connected to the air supply pipe two.

Preferably, the {the difference between the flow rate of the one-way valve minus the pressure loss}<{the difference between the flow rate of the pipe joint minus the pressure loss}. That is, the difference obtained by subtracting the pressure loss from the flow rate of the check valve is smaller than the difference obtained by subtracting the pressure loss from the flow rate of the pipe joint.

Preferably, the air intake direction of the one-way valve is directed from the second air supply pipe to the first air supply pipe.

As a preference, the thickness of the diaphragm on the diaphragm PCV valve in the oil-gas separator must satisfy the high-frequency operation of the PCV valve.

Preferably, the inlet of the air supply pipe assembly is designed at the rear end of the cylinder head cover.

The beneficial effects of the utility model are: the one-way valve prevents the gas inside the cylinder head cover from channeling back to the hose after the air filter, and the diaphragm type PCV valve with quick response has high working frequency, fast airflow speed in the pipeline, and The water vapor ratio is low, which effectively avoids icing and oil emulsification; while meeting the air supply requirements, it avoids the PCV valve working noise; the overall structural layout is flexible, with low space requirements, easy to implement, and low cost .

Description of drawings

Fig. 1 is a kind of structural representation of the utility model.

Fig. 2 is a structural schematic diagram of an air supply pipe assembly of the present invention.

In the figure: 1. Oil-gas separator, 2. Ventilation pipe, 3. Air supply pipe assembly, 31. Pipe joint, 32. Air supply pipe 1, 33. Check valve, 34. Air supply pipe 2, 4. Cylinder head cover, 5. Hose after air filter, 6. Intake manifold.

detailed description

The technical solutions of the present utility model will be further specifically described below through the embodiments and in conjunction with the accompanying drawings.

A kind of automobile crankcase ventilation system of the present embodiment, as shown in Figure 1, comprises the cylinder head cover 4 that is communicated with crankcase, is positioned at the intake manifold 6 of cylinder head cover 4 side, is relatively advanced on cylinder head cover 4 The other side of the gas manifold 6 is provided with an external oil-gas separator 1. The oil-gas separator 1 includes a diaphragm PCV valve, and the thickness of the diaphragm installed on the diaphragm PCV valve must meet the requirements of high-frequency operation of the PCV valve. .

The oil-gas separator 1 is connected with the intake manifold 6 through the ventilation pipe 2 . The inlet of the air supply pipe assembly 3 is set at the near point of the oil-gas separator 1. The inlet is a pipe joint 31, and the air supply pipe assembly 3 is connected to the end of the pipe joint 31 with the air supply pipe 1 32, as shown in Figure 2 , the air supply pipe one 32 is connected with one end of the one-way valve 33, and the other end of the check valve is connected with the two air supply pipe 34, and the intake direction of the one-way valve 33 points to the air supply pipe one 32 from the two air supply pipe 34. The air supply pipe 2 34 in the air supply pipe assembly 3 is connected with the air filter hose 5 at the outer end of the intake manifold 6 . In this embodiment, the flow index of the pipe joint 31 is set, the inner diameter is 3 mm, the length is 34 mm, and the difference between the flow rate of the one-way valve 33 minus the pressure loss is smaller than the difference between the flow rate of the pipe joint 31 minus the pressure loss.

Another embodiment of the access position of the pipe joint 31 of the air supply pipe assembly 3 is that the pipe joint 31 is arranged at the rear end of the cylinder head cover 4 .

When working, through the diaphragm type PCV valve with fast response, high working frequency, fast airflow speed and low gas water vapor ratio, and the one-way valve 33, the gas in the cylinder head cover 4 is prevented from flowing backward to the hose 5 after the air filter, effectively Solve the problems of freezing and oil emulsification.

The above-mentioned embodiment is an illustration of the utility model, not a limitation of the utility model, and any structure after simple transformation of the utility model belongs to the protection scope of the utility model.

Claims (6)

1. an automobile crane box ventilation system, the intake manifold (6) comprise the cylinder cover hood (4) being connected with crankcase, being positioned at cylinder cover hood side, it is characterized in that in described cylinder cover hood, be provided with external placed type oil-gas separator (1), oil-gas separator is connected with intake manifold by vent-pipe (2), oil-gas separator near point position is provided with tonifying Qi pipe assembly (3) access port, and the other end of tonifying Qi pipe assembly is connected with flexible pipe (5) after the air filter of intake manifold outer end; Described oil-gas separator comprises diaphragm type PCV valve; Tonifying Qi pipe assembly (3) is provided with check valve (33).

2. a kind of automobile crane box ventilation system according to claim 1, it is characterized in that described tonifying Qi pipe assembly (3) also comprises tube stub (31), the tonifying Qi pipe one (32) being connected with tube stub one end, tonifying Qi pipe one connects one end of check valve (33), and the other end of check valve connects tonifying Qi pipe two (34).

3. a kind of automobile crane box ventilation system according to claim 2, it is characterised in that described { check valve (33) flow subtracts the difference that pressure is damaged } < { tube stub (31) flow subtracts the difference that pressure is damaged }.

4. a kind of automobile crane box ventilation system according to Claims 2 or 3, it is characterised in that the airintake direction of described check valve (33) points to tonifying Qi pipe one (32) by tonifying Qi pipe two (34).

5. a kind of automobile crane box ventilation system according to claim 1 or 2 or 3, it is characterised in that in described oil-gas separator (1), the diaphragm thickness on diaphragm type PCV valve must meet Pcv valve high-frequency work.

6. a kind of automobile crane box ventilation system according to claim 1 or 2 or 3, it is characterised in that described tonifying Qi pipe assembly (3) access port or design are in the rear end of cylinder cover hood (4).