JPS6242096Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to an oil separator provided in a rocker cover in an internal combustion engine.

[Conventional technology]

An example of a conventional internal combustion engine recirculation circuit is shown in FIG.

In the figure, a crankcase 33 is formed at the bottom of a cylinder 32 in which a piston 31 resides.
A crankshaft 35 that communicates with the piston 31 via a connecting rod 34 is contained therein, and the blow-by gas in the crankcase 33 is introduced into the rocker cover 1 via an introduction path 36 in a mixed state with engine oil. be given

A pair of oil separators 2 and 3 are installed inside the upper part of the rocker cover 1, and the oil separators 2 and 3 are connected to a blow-by gas inlet 2 that communicates with the lower part of the rocker cover 1.
It consists of bottom plates 2B, 3B having A, 3A, filters 2C, 3C provided at the blow-by gas inlets 2A, 3A, and oil separation chambers 2D, 3D formed above the bottom plates 2B, 3B. The blow-by gas introduced into the rocker cover 1 passes through the filter 2 when flowing into the oil separation chambers 2D and 3D via the inlets 2A and 3A of the oil separators 2 and 3.
The oil 42 is separated by passing through C and 3C, and the separated oil 42 is temporarily accumulated in the bottom 1A of the rocker cover 1 along with the oil that lubricated the valve mechanism, and returns to the bottom of the crankcase 33 via a separate route. ,
The blow-by gas flows from the oil separation chambers 2D and 3D of the oil separators 2 and 3 of the Rocker cover 1 to the reflux path 37.
The air is sucked into the air cleaner 38 and intake manifold 39 by negative pressure via A and 37B, and introduced into the combustion chamber 40 where it is combusted. At this time, a pressure-controlled valve 41 operated by the negative pressure of the intake manifold 39 is interposed in the recirculation path 37A to control the amount of recirculation of the blow-by gas.

[Conventional problems]

In the above configuration, when the automobile in which the internal combustion engine is installed makes a sharp turn, the centrifugal force causes the oil 42 temporarily accumulated at the bottom 1A of the rocker cover 1 to be drawn in the direction of the centrifugal force within the rocker cover 1. , and since the automobile itself is also tilted in the direction of centrifugal force, the oil level 42A of the oil 42 rises relatively widely, and the oil separation chambers 2D, 3 of the oil separators 2, 3 pass through the inlets 2A, 3A. Penetrate into 3D. As a result, the blow-by gas flows back through the circuit and is sucked into the combustion chamber 40, resulting in problems such as white smoke being ejected from the exhaust pipe and an increase in engine oil consumption.

[Purpose of this invention]

The present invention aims to solve the above-mentioned conventional problems without interfering with the flow of blow-by gas.

[Means to achieve the purpose]

As a means for achieving the above object, the present invention includes a pair of left and right oil separators 12 and 13 internally installed in the upper part of the rocker cover 11, and the pair of oil separators have a blow-by gas inlet 12A, which communicates with the lower part of the rocker cover 11, respectively. Bottom plate 12B, 13 with 13A
B, and filters 12C and 13C provided on the inner edges of the blow-by gas inlets 12A and 13A,
Oil separation chambers 12D, 13D formed on the top of the bottom plates 12B, 13B and the blow-by gas inlet 12
Shutters 12E, 13 pivoted to A, 13A
The shutters 12E and 13E have springs 12H and 1, respectively, so as to open downward.
3H, and further the shutters 12E,
The present invention provides an oil separator for a rocker cover characterized in that weight portions 12I and 13I are formed on the free end side of the rocker cover 13E.

[Effect]

When a centrifugal force is applied due to a sharp turn of a car, the oil separator shutter on the side in the direction of the centrifugal force resists the elasticity of the spring due to the inertia of the weight, swings upward, and causes the oil separator to move upward. Close the blow-by gas inlet. Therefore, even if the surface of the oil accumulated at the bottom of the rocker cover changes from a horizontal state to an inclined state within the rocker cover due to the centrifugal force and reaches the blow-by gas inlet of the oil separator, the inlet is closed by the shutter. Because of this, oil does not enter the oil separation chamber of the oil separator. However, the shutter of the oil separator on the side opposite to the direction in which the centrifugal force acts is kept open by a spring, and the blow-by gas flows through the oil separator side.

[Effect of idea]

Therefore, in the present invention, oil is prevented from being sucked into the combustion chamber of the engine along with blow-by gas even when the car makes a sharp turn while driving, without interfering with the flow of blow-by gas. Problems such as white smoke spewing out and increased engine oil consumption are eliminated.

〔Example〕

The present invention will be explained in detail based on the embodiments shown in FIG. 2 and below.

2 to 4 show an embodiment of the present invention, in which a pair of left and right oil separators 12 and 13, which are divided into two by a partition wall, are installed in the upper part of the rocker cover 11 to separate the oil. The containers 12 and 13 are blow-by gas inlets 12 communicating with the lower part of the rocker cover 11.
A, 13A bottom plates 12B, 13B, filters 12C, 13C provided at the blow-by gas inlets 12A, 13A, and bottom plates 12B, 13A.
Oil separation chambers 12D and 13D formed in the upper part of 13B
and shutters 12E, 13E pivotally attached to the inner edges of the blow-by gas inlets 12A, 13A, respectively. Oil separation chamber 12 of the oil separators 12 and 13
In the upper part of D, 13D, there is a reflux path 3 with a valve 41 in communication with the intake manifold 39.
A blow-by gas outlet 14A connected to air cleaner 7A, and a reflux path 37 connected to air cleaner 38.
A blow-by gas outlet 14B connected to B is provided. Shutters 12E, 13 of the blow-by gas inlets 12A, 13A of the oil separators 12, 13
E is pivotally attached to the inner edges of the inlets 12A and 13A via hinges 12F and 13F, respectively, and a packing 1 is provided on the inner side of the shutters 12E and 13E.
2G and 13G are attached. The shutter 1
2E, 13E are return springs 12H, 13
It is biased in the opening direction by H, and weight portions 12I and 13I are formed on the free end side.

In the above configuration, when a centrifugal force acts in the direction of the arrow in FIG. 3 due to a sudden turn of the automobile, the oil 42 is also drawn in the direction of the arrow, and the oil level 42A changes from the horizontal state shown in FIG. 2 to the direction of the arrow in FIG. Depends on the tilt state shown. Due to the bias of the oil 42 due to the centrifugal force, the inlet 12A of the oil separator 12 on the side in which the centrifugal force acts
will be immersed in oil 42, but shutter 1
2E resists the elasticity of the spring 12H and swings in the direction of the centrifugal force due to the inertia of the weight portion 12I based on the centrifugal force, thereby closing the inlet 12A. Therefore, oil 42 does not enter into oil separator 12. However, since the inlet 13A of the other oil separator 13 is not immersed in the oil 42 and the shutter 13E is opened by the spring 13H, blow-by gas flows through the oil separator 13 when the vehicle makes a sharp turn. When the shutter 12E is fully opened due to the elasticity of the spring 12H, when the vehicle is driven straight or stopped and centrifugal force is no longer applied to the shutter 12E, the shutter 12E is fully opened due to the elasticity of the spring 12H, but the oil level 42A of the oil 42
At this time, it is naturally in a horizontal state and the inlet 12A is not immersed. In this way, the blow-by gas in the rocker cover 11 smoothly enters the oil separator 12 from the inlet 12A, and is introduced into the combustion chamber 40 via the reflux circuit. Next, when the centrifugal force acts in the opposite direction of the arrow in FIG. 3 due to a sudden turn of the car, the inlet 13A on the side of the centrifugal force is immersed in oil 42, but in this case as well, the shutter 1
3E closes the inlet 13A, the oil 42 does not enter the oil separator 13, and the blow-by gas flows through the oil separator 12 side. In addition, shutter 12
If a material with a specific gravity smaller than oil is used for E, 13E, buoyancy will be added to the centrifugal force, causing the shutters 12E, 1
The closing action of 3E is performed more quickly.

[Brief explanation of the drawing]

FIG. 1 is a front sectional view of a conventional example, FIGS. 2 to 4 show a first embodiment of the present invention, and FIG. 2 is a front sectional view,
FIG. 3 is a front sectional view when centrifugal force is applied, and FIG. 4 is an enlarged partial sectional view of the vicinity of the oil separator inlet. In the figure, 11...Rotzker cover, 12, 13...
...Oil separator, 12A, 13A...Blow-by gas inlet, 12B, 13B...Bottom plate, 12C, 13C
...Filter, 12D, 13D...Oil separation chamber,
12E, 13E...Shutter, 12H, 13H
...Spring, 12I, 13I... Weight part.

Claims (1)

[Scope of utility model registration request] A pair of left and right oil separators are installed inside the upper part of the rocker cover, and each of the pair of oil separators includes a bottom plate having a blow-by gas inlet communicating with the lower part of the rocker cover, a filter provided at the blow-by gas inlet, and a filter formed on the upper part of the bottom plate. and a shutter pivotally mounted on the inner edge of the blow-by gas inlet, each of which is urged by a spring to open downward, and furthermore, a weight is attached to the free end of the shutter. The oil separation mechanism of the rocker cover is characterized by the formation of a weight part.