JPH0452370B2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a breather device for an internal combustion engine that separates a gas-liquid mixture of blow-by gas and lubricating oil mixed into the blow-by gas into oil and gas, and guides the separated gas to the outside of the crankcase. be.

[Conventional technology]

Conventionally, a rotating disk was provided in a chamber communicating with the crankcase, and the rotation of this rotating disk was used to centrifugally separate the gas-liquid mixture, thereby guiding gas to the outside of the crankcase (Japanese Patent Laid-Open No. No. 57-2411) is known.

[Problem to be solved by the invention]

However, in this prior art, a rotating disk for centrifuging the gas-liquid mixture must be specially provided, and a rotational force transmitting member for transmitting the rotation of the crankshaft must be provided to this rotating disk. There is a problem when the structure becomes complicated. The present invention has been proposed in view of the above circumstances, and includes a special provision of a rotating disk for centrifuging a gas-liquid mixture and a rotational force transmitting member for transmitting the rotation of a crankshaft to this rotating disk. It is an object of the present invention to provide a breather device for an internal combustion engine with an extremely simple structure, which centrifugally separates a gas-liquid mixture and guides the separated gas to the outside of the crankcase.

[Means to solve the problem]

Its feature is that it uses the existing clutch mechanism and the rotating part of the bowl-shaped AC generator as an auxiliary device for the internal combustion engine, and creates a separation chamber that communicates with the crank chamber by the rotation of the rotating part that rotates in synchronization with the crankshaft. , the gas-liquid mixture of the prove-by gas and the lubricating oil is centrifugally separated.

【Example】

Hereinafter, each embodiment of the present invention will be described in detail based on the drawings. First, a first embodiment of the present invention in which a bowl-shaped AC generator is used as an auxiliary device for an internal combustion engine will be described with reference to FIGS. 1 and 2. In the figure, numeral 1 is a cylinder, 2 is a piston, 3 is a connecting rod, 4 is a crankcase, and 5 is a crankshaft. A cover 6 is fixed to the crankcase 4, and the cover 6 forms a separation chamber 8 communicating with a crank chamber 7 within the crankcase 4. Further, in the separation chamber 8, a bowl-shaped AC generator 11 consisting of an ACG stator section 9 and an ACG rotor section 10 is disposed. This ACG stator section 9 is fixed to the protrusion 12 of the cover 6 with bolts 13. On the other hand, the ACG
The rotor portion 10 is attached to the crankshaft 5 with a key 14.
and a part A fixed by a bolt 15, and a part B fixed to this part A by a rivet 16.
It consists of a magnet M fixed to this B part. Thereby, this ACG rotor portion 10 rotates together with the crankshaft 5, and its cross-sectional shape is U-shaped with an opening 10a on the left side. A breather passage 18 is formed in the cover 6 and has a discharge port 17 opened at the center of the opening 10a having a U-shaped cross section. This breather passage 18 communicates with a chamber 20 provided in the upper part of the crank chamber 7 away from the oil level 19a of the lubricating oil 19 in the crank chamber 7. A breather pipe 21 connected to an air cleaner (not shown) is formed at the top of the chamber 20, and an oil conduit 22 is formed at the bottom of the chamber 20 for draining lubricating oil that has entered the chamber 20. An outflow port 20a is formed therein. A chamber 20 is provided at the lower end of this oil conduit 22.
A valve mechanism 23 is provided that opens due to the weight of the lubricating oil falling from the valve and prevents the lubricating oil from flowing back. The operation of the first embodiment described above will be explained below.
The ACG rotor section 1 is rotated by the rotation of the crankshaft 5.
0 rotates, a swirling flow is generated in the separation chamber 8 where a gas-liquid mixture of blow-by gas and lubricating oil that has flowed into the separation chamber 8 from the crank chamber 7 exists, and the oil is blown to the periphery of the separation chamber 8. The gas remains in the center of the separation chamber 8. At the same time, oil is transferred to the ACG rotor section 10.
Gap 24 formed between ACG stator part 9
It is separated from the blow-by gas while passing through.
That is, when the gas-liquid mixture passes through the gap 24, highly viscous oil adheres to each wall surface forming the gap, and the adhered oil is affected by the centrifugal force exerted by the rotation of the ACG rotor section 10. Therefore, it is blown around the separation chamber 8. In this way, ACG
The rotation of the rotor section 10 separates the gas-liquid mixture into oil and gas. The gas remaining in the center of the separation chamber 8 enters the breather passage 18 from the discharge port 17, passes through the chamber 20, and is guided to the outside of the crankcase 4 from the breather pipe 21. Further, in the above embodiment, even if a part of the gas-liquid mixture flows into the breather passage 18, the oil adheres to the wall surface of the breather passage 18.
Also in this passage 18, oil is separated from the gas-liquid mixture. Furthermore, in this first embodiment, since the chamber 20 is provided in the upper part of the crank chamber 7 away from the oil level 19a of the lubricating oil 19, for example, lubricating oil may flow into the chamber 20 due to an inclination of the vehicle. In this case, or even if oil gets mixed into the gas and enters the chamber 20 from the breather passage 18, the oil such as lubricating oil in the chamber 20 will flow from the outlet 20a to the oil conduit 22 due to its own weight.
guided to fall. Therefore, oil such as lubricating oil does not leak out of the crankcase 4. Next, a second embodiment of the present invention in which a clutch mechanism is used as an auxiliary device for an internal combustion engine will be described with reference to FIG. In the figure, reference numeral 30 indicates a crankcase, and a clutch cover 31 is fixed to this crankcase 30.
forms a separation chamber 33 communicating with a crank chamber 32 within the crankcase 30. Further, in the separation chamber 33, a clutch mechanism 35 is provided which connects and disconnects the rotational force of a crankshaft (not shown) to the main shaft 34 by an external clutch operation. This clutch mechanism 35 is rotatably supported by the main shaft 34 and has a clutch outer 37 fixed to a gear 36.
A friction plate 50 is fixed to the notch 37a of the clutch outer 37. The rotation of the crankshaft is transmitted to the gear 36 via a primary drive gear (not shown). Further, the clutch mechanism 35 includes a friction plate 51
The friction plates 50 and 51 are engaged by external clutch operation, and the rotation of the clutch outer 37 is caused by the friction plates 5 and 51 being engaged.
0,51, and is configured to be transmitted to the main shaft 34 via an inner clutch 52. That is, the clutch mechanism 35 connects and disconnects the rotational force of the crankshaft transmitted to the clutch outer 37 via the primary drive gear and the gear 36 to the main shaft 34 by receiving a clutch operation from the outside. It is configured as follows. An outer cover 38 is fixedly provided on the clutch outer 37, and the outer cover 38 has an opening 39 in its center and a protrusion 40. Accordingly, the clutch outer 37 and the outer cover 38
The cross-sectional shape consists of an opening 3 on the right side.
It is U-shaped with 9. The clutch cover 31 also has a discharge port 41 opened at the center of the opening 39 having a U-shaped cross section, and a breather passage 43 communicating with a breather pipe 42 connected to an air cleaner (not shown). is formed. Further, the clutch cover 31 is formed with protrusions 45 and 46 for forming a gap 44 with the wall surface of the protrusion 40. This gap 44 has the same function as the gap 24 in the first embodiment.
The operation of the second embodiment described above will be explained below. When the rotation of the crankshaft is transmitted to the gear 36,
The clutch outer 37 and the outer cover 38 rotate around the main shaft 34. Due to this rotation of the clutch outer 37 and the outer cover 38, a swirling flow is generated in the separation chamber 33 in which a gas-liquid mixture of blow-by gas and lubricating oil that has flowed in from the crank chamber 32 exists, and the oil is removed from the separation chamber 33. The gas is blown to the periphery and remains in the center of the separation chamber 33. At the same time, the oil component is also separated from the blow-by gas when passing through the gap 44. That is,
The oil adhering to each wall surface forming the gap 44 is blown to the periphery of the separation chamber 33 by the centrifugal force exerted by the rotation of the outer cover 38. In this manner, the gas-liquid mixture, oil, and gas are separated in the separation chamber 33 by the rotation of the clutch outer 37 and the outer cover 38. The gas remaining in the center of the separation chamber 33 enters the breather passage 43 from the discharge port 41 and is guided to the outside of the crankcase 30 from the breather pipe 42 through the breather passage 43. Furthermore, as in the case of the first embodiment,
Even if a portion of the gas-liquid mixture flows into the breather passage 43, the oil adheres to the wall surface of the breather passage 43, so that the oil is separated from the gas-liquid mixture also within the breather passage 43. The first embodiment, which uses a bowl-shaped AC generator as an auxiliary device for an internal combustion engine, and the second embodiment, which uses a clutch mechanism as an auxiliary device, are combined, and the respective breather passages are connected to one chamber. By configuring this, it is possible to obtain a breather device with improved oil separation ability compared to the first and second embodiments. In other words, there are two separate rooms: one where the bowl-shaped AC generator is installed and the other where the clutch mechanism is installed.
Since two separation chambers are provided, the flow rate of the gas-liquid mixture in each separation chamber is the same as in the first embodiment and the second embodiment.
Since the time is slower than in the example, the oil separation ability is improved.

【Effect of the invention】

As described above, according to the present invention, an existing clutch mechanism or a rotating part of a bowl-shaped AC generator is used as an auxiliary device of an internal combustion engine, and by the rotation of the rotating part that rotates in synchronization with the crankshaft, Since the gas-liquid mixture of blow-by gas and lubricating oil is centrifugally separated in the separation chamber communicating with the crank chamber, it is possible to obtain a breather device for an internal combustion engine with an extremely simple structure. That is, according to the present invention, there is no need to specially provide a rotating disk for centrifuging the gas-liquid mixture and a rotational force transmitting member for transmitting the rotation of the crankshaft to the rotating disk. A very simple breather device for an internal combustion engine can be obtained. In addition, when installing a breather passage,
Since the breather passage is provided integrally with the cover member forming the separation chamber, the breather passage does not protrude outward significantly, allowing for compactness and excellent appearance. In addition, since the discharge port of the auxiliary machine's U-shaped opening in cross section is communicated with the upper breather chamber of the auxiliary machine through this breather passage, even if a gas-liquid mixture containing oil flows from the discharge port. Even if oil spills into the breather passage, the oil adheres to the wall of the breather passage, making it difficult for the oil to leak out.

[Brief explanation of drawings]

FIG. 1 is a partial cross-sectional view showing an internal combustion engine equipped with a breather device according to a first embodiment of the present invention, FIG. 2 is a cross-sectional view showing the first embodiment of the present invention, and FIG. FIG. 3 is a sectional view showing a second embodiment. Crankshaft...5, cover (cover member)...6,
Crank chamber...7, 32, Separation chamber...8, 33, Auxiliary machine...11, 35, Rotating part...10, (37; 38), Discharge port...17, 41, Breather passage...18, 4
3. Chamber (breather room)...20.

Claims (1)

[Claims] 1. A supplementary part of the internal combustion engine that rotates in synchronization with the crankshaft of the internal combustion engine is placed in a separated chamber formed on the side of the crank chamber of the internal combustion engine so that the outer part thereof is covered with a cover member to form a sealed space. The rotating part of the auxiliary machine is formed in a U-shaped cross section with the opening facing outward, and a discharge port is provided in the center of the opening of the U-shaped cross section. communicates with a breather chamber provided above the auxiliary equipment through a breather passage formed integrally with the cover member and formed in a U-shape so as to bypass the auxiliary equipment. Breather device for internal combustion engine.