JP2020109260A - Oil collecting structure and blow-by gas treatment device including oil collecting structure - Google Patents

Abstract

To collect oil included in blow-by gas discharged to outside air.SOLUTION: An oil collecting structure 40 is for a blow-by gas treatment device 30 including: extraction piping 32 extracting blow-by gas from inside of a crank case 17B of an engine 10; a separator 31 separating the blow-by gas introduced from the extraction piping 32 into gas and liquid; and discharge piping 33 discharging the blow-by gas separated by the separator 31 from a discharge port 33C at the downstream end to outside air. The oil collecting structure includes a bottomed cylindrical oil storage part 42 disposed below the discharge port 33C and opened upwards facing the discharge port 33C.SELECTED DRAWING: Figure 2

Description

The present disclosure relates to an oil collecting structure and a blow-by gas processing device including the oil collecting structure.

Conventionally, a blow-by gas processing device has been widely put into practical use, which ventilates blow-by gas that has leaked into the crankcase from a combustion chamber through a gap between a cylinder and a piston. The blow-by gas processing device is a so-called closed type PCV (Positive Crankcase Ventilation) system that recirculates the blow-by gas that has passed through the oil separator from the crankcase to the intake system, and the blow-by gas that has passed through the oil separator from the crankcase to the outside air. There is a so-called open type system that discharges into the air (for example, see Patent Documents 1 and 2).

JP, 2017-193963, A JP-A-57-016213

By the way, in the oil separator as described above, the oil contained in the blow-by gas may not be completely separated from the blow-by gas. Therefore, in the closed type system, if oil remains in the blow-by gas recirculated to the intake system, the residual oil adheres to the compressor of the turbocharger, etc. May affect control. On the other hand, in the above open type system, such residual oil can be prevented from adhering to the intake system parts, but the residual oil contained in the blow-by gas leaks to the outside as the blow-by gas is discharged to the outside air. there's a possibility that.

The technique of the present disclosure aims to effectively collect oil contained in blow-by gas discharged to the outside air.

The oil collection structure of the present disclosure is a derivation pipe for deducing blow-by gas from the inside of a clan case of an engine, a separator for separating liquid from the blow-by gas introduced from the derivation pipe, and a blow-by gas separated by the separator. An oil collecting structure of a blow-by gas processing device, comprising: a discharge pipe for discharging outside air from a discharge port at a downstream end; the oil collecting structure is arranged below the discharge port and opens upward facing the discharge port. It is characterized by having a bottomed cylindrical oil storage part.

Further, the exhaust pipe is arranged adjacent to a side portion of the engine, and the oil storage portion projects laterally from the exhaust port from a side portion of the engine below the exhaust port. It is preferable that the upper surface of the protrusion is recessed.

Further, it is preferable that the protruding portion is formed integrally with a cylinder block of the engine.

Further, the discharge pipe is arranged adjacent to a side portion of the engine, and the oil storage portion is a bottomed bottom of a bottle container detachably attached to a side portion of the engine below the discharge port. It is preferably formed by a tubular container body.

The blow-by gas treatment device of the present disclosure is characterized by including the oil collecting structure.

According to the technique of the present disclosure, oil contained in blow-by gas discharged to the outside air can be effectively collected.

It is a typical whole block diagram showing an engine provided with a blow-by gas treatment device concerning a first embodiment. (A) is a schematic cross-sectional view showing the oil collecting structure according to the first embodiment, and (B) is a schematic plan view showing the oil collecting structure according to the first embodiment. It is a typical sectional view showing an oil collecting structure concerning a second embodiment.

Hereinafter, an oil collecting structure according to the present embodiment and a blow-by gas processing apparatus including the oil collecting structure will be described with reference to the accompanying drawings. The same parts are designated by the same reference numerals and have the same names and functions. Therefore, detailed description thereof will not be repeated.

[First embodiment]
FIG. 1 is a schematic overall configuration diagram showing an engine including a blow-by gas processing device according to a first embodiment.

A diesel engine (hereinafter, simply referred to as an engine) 10 includes a cylinder block CB in which a cylinder 17A that accommodates a piston P so as to reciprocate is formed. A cylinder head CH is provided above the cylinder block CB. A cylinder head cover 11 is provided above the cylinder head CH. The cylinder head CH is provided with an intake port 12A, an exhaust port 12B, an intake valve 13A, an exhaust valve 13B, an injector 16 and the like. An intake manifold 14 is connected to the intake port 12A, and an exhaust manifold 15 is connected to the exhaust port 12B.

A combustion chamber is defined by the inner wall of the cylinder 17A of the cylinder block CB, the lower surface of the cylinder head CH, and the top surface of the piston P. Further, the cylinder block CB is provided with a crank case 17B that houses the crank shaft CS. An oil pan 18 for storing engine oil is provided below the crankcase 17B. Further, a crankshaft CS is connected to the piston P via a connecting rod CR. For the sake of illustration, only one cylinder of the plurality of cylinders of the engine 10 is shown in FIG. 1, and the other cylinders are not shown. The engine 10 may be either a multi-cylinder engine or a single-cylinder engine.

An intake passage 20 for introducing intake air is connected to the intake manifold 14. The intake passage 20 is provided with a compressor 24 of a turbocharger 23, an intercooler 27, and the like in order from the intake upstream side. An exhaust passage 21 is connected to the exhaust manifold 15 for discharging exhaust gas to the atmosphere. The exhaust passage 21 is provided with a turbine 25 of a turbocharger 23, an exhaust purification device (not shown), and the like. The turbocharger 23 includes a turbine 25 that is rotationally driven by exhaust gas, and a compressor 24 that is provided coaxially with the turbine 25 and pressure-feeds intake air.

The blow-by gas processing device 30 includes an oil separator 31, a blow-by gas outlet pipe 32, a blow-by gas discharge pipe 33, an oil return pipe 35, and an oil collecting structure 40.

The blowby gas outlet pipe 32 connects the blowby gas outlet of the crankcase 17B and the blowby gas inlet of the oil separator 31. The blow-by gas lead-out pipe 32 introduces the blow-by gas that has leaked into the crankcase 17B from the combustion chamber side through the gap between the piston P and the inner wall of the cylinder 17A into the oil separator 31.

The oil separator 31 serves as a separator for separating the blow-by gas and the oil into gas and liquid by causing blow-by gas to collide with a collision plate (not shown) and causing oil contained in the blow-by gas to adhere to the collision surface of the collision plate. Function.

The blow-by gas discharge pipe 33 has its upstream end 33A connected to the blow-by gas outlet of the oil separator 31, and its downstream end 33B discharges the blow-by gas gas-liquid separated by the oil separator 31 to the outside air. A discharge port 33C is formed. Further, the blow-by gas discharge pipe 33 is extended substantially vertically so that the discharge port 33C on the downstream end side is vertically below the upstream end portion 33A. A predetermined gap L1 is provided between the downstream end portion 33B of the blow-by gas discharge pipe 33 and the side surface of the cylinder block CB, and even when the blow-by gas discharge pipe 33 swings due to vibration of the engine 10 or the like. The interference between the downstream end portion 33B and the cylinder block CB can be prevented.

The oil return pipe 35 connects the oil outlet portion of the oil separator 31 and the oil inlet portion of the crankcase 17B. At least a part of the oil separated from the blow-by gas by the oil separator 31 is returned to the oil pan 18 via the oil return pipe 35.

The oil collecting structure 40 is provided vertically below the downstream end portion 33B of the blow-by gas discharge pipe 33, and collects the oil dropped from the discharge port 33C. Hereinafter, details of the oil collecting structure 40 will be described.

FIG. 2A is a schematic cross-sectional view showing the oil collecting structure 40 according to this embodiment. FIG. 2B is a schematic plan view showing the oil collecting structure 40 according to the present embodiment.

The oil collecting structure 40 includes a protruding portion 41 protruding from the side surface of the cylinder block CB, and an oil storage portion 42 that is recessed in the protruding portion 41 and stores the oil dropped from the blow-by gas discharge pipe 33.

The protruding portion 41 is provided so as to protrude from the side surface of the cylinder block CB below the discharge port 33C of the blow-by gas discharge pipe 33 in the horizontal direction (lateral direction) than the discharge port 33C. The protrusion 41 is preferably formed integrally with the cylinder block CB by die casting. The protrusion 41 may be formed separately from the cylinder block CB. In this case, the protrusion 41 formed separately may be fixed to the side surface of the cylinder block CB by a bracket or the like (not shown).

The oil storage portion 42 is provided in the upper surface of the protruding portion 41 so as to be recessed in a bottomed tubular shape that faces the discharge port 33C and opens upward. The opening width of the oil reservoir 42 is formed wider than the opening width of the discharge port 33C. The oil reservoir 42 is preferably provided vertically below the downstream end 33B of the blow-by gas discharge pipe 33 so that the axial center of the downstream end 33B is located substantially at the center of the bottom surface 42A of the oil reservoir 42. ing.

A predetermined clearance C is secured between the bottom surface 42A of the oil reservoir 42 and the discharge port 33C. The clearance C does not hinder the flow of blow-by gas discharged from the blow-by gas discharge pipe 33 to the outside air, and when the oil stored in the oil storage section 42 is freeze-expanded in a low temperature atmosphere, The length is set such that the discharge port 33C is not closed.

According to the oil collecting structure 40 of the first embodiment described in detail above, the protrusion 41 is provided below the discharge port 33C of the blow-by gas discharge pipe 33, and the oil is provided on the upper surface of the protrusion 41 facing the discharge port 33C. Since the storage portion 42 is provided as a recess, the oil that cannot be completely separated by the oil separator 31 and is dropped from the discharge port 33C is dropped into the oil storage portion 42. As a result, the oil dripping from the discharge port 33C can be reliably collected in the oil reservoir 42, and the oil can be effectively prevented from adhering to peripheral parts and scattering to the outside.

[Second embodiment]
Next, the oil collecting structure according to the second embodiment will be described based on FIG. FIG. 3 is a schematic cross-sectional view showing the oil collecting structure 50 according to the second embodiment.

As shown in FIG. 3, the oil collecting structure 50 is formed by a bottle container 51. Specifically, the bottle container 51 includes a container body portion 52, a narrowed portion 53, a short tubular portion 54, and a fixing band 58. The configuration other than the oil collecting structure 50 is substantially the same as that of the first embodiment, and thus the description thereof is omitted.

The container body 52 is formed in a substantially bottomed cylindrical shape having a diameter larger than the outer diameter of the discharge port 33C of the blow-by gas discharge pipe 33, and collects the oil dropped from the discharge port 33C. The container body 52 is detachably attached to the side portion of the cylinder block CB by winding a fixing band 58 around the outer peripheral surface of the cylinder portion. When a predetermined amount or more of oil is trapped in the container body 52, the bottle container 51 can be removed to clean or replace it.

The constricted portion 53 is formed in a substantially frustoconical tubular shape whose diameter decreases from the upper end edge of the tubular portion of the container body 52 toward the upper side. That is, the leakage of the oil collected in the container body 52 to the outside is effectively blocked by the inner surface of the constricted portion 53.

The short tubular portion 54 is formed in a substantially cylindrical shape extending upward from the upper edge of the narrowed portion 53. The inner diameter of the short tubular portion 54 is formed to be substantially the same as the outer diameter of the blow-by gas discharge pipe 33 or slightly larger. At least the downstream end portion 33B of the blow-by gas discharge pipe 33 is inserted and arranged in the short tubular portion 54.

According to the oil collecting structure 50 of the second embodiment described in detail above, the bottomed cylindrical container body 52 of the bottle container 51 is arranged below the discharge port 33C of the blow-by gas discharge pipe 33 to discharge the blow-by gas. By inserting and arranging the downstream end portion 33B of the pipe 33 into the short cylinder portion 54 of the bottle container 51, the oil that cannot be completely separated by the oil separator 31 and is dropped from the discharge port 33C is reliably dropped into the container body 52. Is configured. This makes it possible to reliably store the oil dripping from the discharge port 33C in the bottle container 51, and to effectively prevent the oil from adhering to peripheral parts and scattering to the outside.

[Other]
It should be noted that the present disclosure is not limited to the above-described embodiment, and may be appropriately modified and implemented without departing from the spirit of the present disclosure.

For example, the downstream end portion 33B of the blow-by gas discharge pipe 33 can be formed in any shape, and a notch may be provided obliquely so that oil can be easily dropped. Further, the oil collecting structures 40, 50 may be fixed to a portion other than the cylinder block CB of the engine 10, a vehicle body frame other than the engine 10, or the like.

Further, the engine 10 is not limited to a diesel engine, but can be widely applied to other engines such as a gasoline engine.

10 Engine CB Cylinder Block CH Cylinder Head 11 Cylinder Head Cover 14 Intake Manifold 15 Exhaust Manifold 20 Intake Passage 21 Exhaust Passage 23 Turbocharger 24 Compressor 25 Turbine 27 Intercooler 30 Blow-by Gas Treatment Device 31 Oil Separator 32 Blow-by Gas Outlet Piping 33 Blow-by Gas Emission Pipe 33A Upstream end 33B Downstream end 33C Discharge port 35 Oil return pipe 40 Oil collection structure 41 Projection 42 Oil storage 42A Bottom 50 Oil collection structure 51 Bottle container 52 Container body

Claims (5)

Outlet piping for outflowing blow-by gas from the inside of the engine's clan case, a separator for gas-liquid separation of the blow-by gas introduced from the outflow piping, and exhaust of the blow-by gas separated by the separator to the outside air from the outlet at the downstream end. An oil collecting structure of a blow-by gas treatment device having a discharge pipe for
An oil collecting structure having a bottomed cylindrical oil storage portion that is arranged below the discharge port and opens upward facing the discharge port. The exhaust pipe is arranged adjacent to the side portion of the engine,
The oil collecting structure according to claim 1, wherein the oil storage portion is provided in an upper surface portion of a projecting portion that projects laterally from the exhaust port from a side portion of the engine below the exhaust port. .. The oil collecting structure according to claim 2, wherein the protruding portion is formed integrally with a cylinder block of the engine. The exhaust pipe is arranged adjacent to the side portion of the engine,
The oil collecting structure according to claim 1, wherein the oil storage part is formed by a bottomed cylindrical container body part of a bottle container that is detachably attached to a side part of the engine below the discharge port. .. A blow-by gas treatment device comprising the oil collecting structure according to claim 1.

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