JPH081192U - Blow-by gas processing equipment for engines - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] Regarding blow-by gas treatment equipment for engines, please refer to
(EN) A device that cuts off the pressure fluctuation of the intake system acting on a CV valve, maintains the normal operation of the valve, and is inexpensive and easy to assemble. In a processing device for introducing blow-by gas into a top cover 4 through a PCV valve 6 and sucking it into an intake system, a passage 43 having an opening 46 is formed below the PCV valve and below the top cover, and the opening is filled with a packing 5 for the top cover.
The tongue-shaped piece 52 formed integrally with the valve is configured to close when the pressure in the intake system is higher than the pressure in the passage, and to open when the pressure is low. Even when the internal pressure of the intake system fluctuates greatly, when the internal pressure of the top cover becomes higher than the internal pressure of the passage, the tongue of packing closes the opening of the passage, so the top acting on the PCV valve via the passage, etc. The pressure in the cover is completely cut off, and normal operation is maintained only by the pressure in the crankcase.
Further, since the tongue-shaped piece is used as the valve, the cost is low and the assembly is easy.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an engine blow-by gas treatment device having a mechanism capable of effectively retaining the function of a PCV (positive crankcase ventilation) valve.

[0002]

[Prior art]

 Blow-by gas generated in the engine crankcase is sucked into the intake system from the air cleaner to the intake manifold through the intake manifold and intake port to the intake valve, and burned in the cylinder. The PCV valve is installed between the intake system and the intake system for the purpose of force adjustment, and only when the pressure in the crankcase exceeds a predetermined positive pressure, the PCV valve is opened to send blowby gas to the intake system, and the intake system is inhaled. I'm trying to make a difference.

[0003]

[Problems to be solved by the device]

 By the way, in a non-supercharged engine, the pressure in the intake system fluctuates due to the opening and closing of the intake valve, but this is remarkable in an engine with a small number of cylinders, such as 2 or 3, and the pressure in the intake system is positive. Or it fluctuates greatly with negative pressure. The large fluctuation in the intake system pressure acts on the PCV valve through a pipe, a passage or the like that sends blow-by gas to the intake system, and tends to hinder normal operation of the valve only by the crankcase internal pressure. Met. In view of the above, the present invention provides an inexpensive and simple blow-by gas treatment device that can shut off the pressure fluctuation in the intake system acting on the PCV valve and maintain the normal operation of the PCV valve. The purpose is to

[0004]

[Means for Solving the Problems]

 The blow-by gas treatment device for an engine of the present invention to achieve the above object is a blow-by gas treatment device for an engine, which introduces blow-by gas in the crankcase into the top cover through a PCV valve and sucks it into the engine intake system from the cover. In addition, a communication passage opening below the top cover from the PCV valve is formed, and a tongue-shaped piece integrally formed with the opening in the packing of the top cover makes the intake system pressure higher than the passage internal pressure. It is characterized in that it is configured to close when open and open when low.

[0005]

[Work]

 In the above structure, when the pressure in the crankcase is low, the force acting on the diaphragm of the PCV valve is small, so the PCV valve is closed. When the pressure in the crankcase reaches a predetermined value, the diaphragm of the PCV valve moves upward and the PCV valve opens, so the blow-by gas flows through the PCV valve into the pressure regulating passage. At this time, if the pressure in the top cover is lower than the pressure in the pressure regulating passage, the tongue of the packing opens, and blow-by gas in the crankcase enters the top cover through the opening and fresh air is introduced from the intake port. At the same time, it is sucked into the cylinder of the engine and burned. When the positive pressure in the top cover becomes higher than the pressure in the pressure control passage, the pressure causes the tongue to close the opening, and acts on the diaphragm of the PCV valve via the pressure control passage. Cut off high positive pressure. Therefore, the opening / closing control of the PCV valve is performed only by the pressure in the crankcase, and the normal operation of the PCV valve is maintained.

[0006]

【Example】

 1 to 3, the blow-by gas treating apparatus of the present invention will be described in detail. The embodiment shown here is an application of the present invention to an engine having three cylinders. Reference numeral 1 denotes a cylinder head, which is a gas that communicates from a top surface of the head 1 to a plurality of intake ports 2, 2 ', 2 "and a crank case (not shown) that communicate with a cylinder (not shown) in a cylinder body. A passage 3 is formed. Reference numeral 4 denotes a top cover mounted on the cylinder head 1 by sandwiching a packing 5 which will be described later. In this example, the top cover also serves as an intake manifold, and a breather is provided at one end on the gas passage 3 side. A chamber 41 is provided, and a block 44 in which a valve seat 42 and a part of the pressure adjusting passage 43 are formed is formed in the center of the chamber 41.

A PCV valve 6 is provided with a diaphragm 64 which is pressed downward by a spring 62 via a spring seat 63 in a case 61, and a seal ring portion for seating on the valve seat 42 is mounted on a lower surface of the diaphragm 64. 65 is formed. The pressure adjusting passage 43 extends from the inside of the block 44 and is disposed inside the side wall 45 of the top cover 4 near the lower end thereof as shown by a dotted line in FIG. 1, and the center of the intake ports 2, 2 ′, 2 ″. The packing 5 is made of, for example, synthetic rubber and is interposed between the lower end of the top cover 4 and the upper surface of the cylinder head 1, and its cross section is shown in FIG. As described above, the main body 53 includes, for example, the convex portion 51 fitted into the concave portion 47 forming the pressure regulating passage 43 of the top cover 4 and the tongue-shaped piece 52 that constantly closes the opening 46 at the position of the opening 46. It is integrally formed and is fixed to the lower end of the top cover 4 by press-fitting the convex portion 51 into the concave portion 47. Reference numeral 7 is an air duct, which has an air cleaner 8 attached to one end and the other end to the top cover 4 Are connected. Further, 48 is an orifice.

Next, the operation of the blow-by gas treatment device of the present invention will be described. As the engine rotates, the air from the air cleaner 8 enters the top cover 4 through the air duct 7, and is sucked into the cylinder through any of the intake ports 2, 2 ', 2 "according to the explosion order of the cylinder. At this time, when the pressure in the crankcase is low, since the force acting on the diaphragm 64 of the PCV valve 6 is small, the seal ring portion 65 is pressed against the valve seat 42 by the spring 62, and the PCV valve 6 is closed. However, in this case as well, since the orifice hole 48 is open, the tongue-shaped piece 52 opens the opening 46 as described later so that the inside of the crankcase communicates with the inside of the top cover 4 through the pressure adjusting passage 43, and the crank The pressure in the case and the pressure in the top cover 4 can be balanced.

When the pressure in the crankcase reaches a predetermined value, the diaphragm 64 of the PCV valve 6 moves upward in FIG. 1 against the spring 62, and a gap is created between the seal ring portion 65 and the valve sheet 42. The blow-by gas from the gas passage 3 flows into the pressure adjusting passage 43 through the gap of the PCV valve 6. At this time, when the pressure in the top cover 4 is lower than the pressure in the pressure adjusting passage 43, the tongue piece 52 of the packing 5 is opened as shown by the dotted line in FIG. 3, and the blow-by gas in the crankcase is opened from the opening 46 in the top cover. 4 and is sucked into the cylinder of the engine together with fresh air from any of the intake ports 2, 2 ', 2 "and burned. The inside of the top cover 4 is higher than the pressure inside the pressure regulating passage 43. When pressure is applied, the tongue 52 closes the opening 43 as shown by the solid line in FIG. 3, and acts on the diaphragm 64 of the PCV valve 6 via the pressure adjusting passage 43. Therefore, the opening and closing of the PCV valve 6 is controlled only by the pressure in the crankcase, and the normal operation of the PCV valve 6 is maintained.

[0010]

[Application example]

 The PCV valve 6 may not have the diaphragm 64 as in the embodiment, or may be an independent single body without being incorporated in the top cover 4. Although the passage 43 is formed in the top cover 4 in the embodiment, it may be opened from the outside into the top cover 4 by using a pipe.

[0011]

[Effect of device]

 The blow-by gas treatment device for an engine of the present invention is a blow-by gas treatment device for an engine, in which blow-by gas in a crankcase is introduced into a top cover through a PCV valve and is sucked into the engine intake system from the cover. A passage opening to the lower side of the top cover is formed, and a tongue-shaped piece formed integrally with the opening in the packing of the top cover closes when the intake system pressure is higher than the passage internal pressure and opens when the intake system pressure is lower. Therefore, even when the pressure in the suction system fluctuates significantly, when the pressure in the top cover becomes higher than the pressure in the passage reaching the top cover from the PCV valve, the opening of the passage is packed. Top cover that tries to act on the PCV valve through the passage or the like because the tongue is blocked Pressure is completely blocked, the normal operation by only the crankcase over scan in pressure at the PCV valve is maintained. Therefore, the normal operation of the PCV valve has the effect of ensuring proper operation of the blow-by gas and at the same time ensuring normal operation of the engine. Further, according to the present invention, since the tongue-shaped piece formed integrally with the packing of the top cover is used as the valve for opening and closing the opening of the passage, it is not necessary to provide a separate valve, the cost is low, and the assembly is low. There is also an effect that it can be easily attached.

[Brief description of drawings]

FIG. 1 is a sectional view of a blow-by gas processing device of an engine according to the present invention.

FIG. 2 is an enlarged view of a main part of FIG. 1;

FIG. 3 is a sectional view taken along the line AA of FIG. 2; cylinder head 2, 2 ′, 2 ″; intake port 3; gas passage 4; top cover 41; breather chamber 42; valve seat 43; pressure adjusting passage 44 Block 45; Side wall 46; Opening 47; Recess 48; Orifice hole 5; Packing 51; Projection 52; Tongue 53; Body 6; PCV valve 61; Case 62; Spring 63; Spring seat 64; Diaphragm 65; Seal Ring part 7; Air duct 8; Air cleaner.

Claims (1)

[Scope of utility model registration request] 1. The blow-by gas in the crankcase is P
In a blow-by gas treatment device for an engine, which is introduced into a top cover through a CV valve and sucked into the engine intake system from the cover, a passage opening below the top cover from the PCV valve is formed, and the opening is formed into the top cover. A blow-by gas treatment apparatus for an engine, wherein the tongue-shaped piece integrally formed with the packing is configured to close when the intake system pressure is higher than the passage internal pressure and open when the intake system pressure is lower than the passage internal pressure.