JP2021088934A - Blow-by gas exhaust structure - Google Patents

Abstract

To enable a simple blow-by gas exhaust structure to prevent a blow-by gas hose from ice accretion on an inner wall thereof and from blockage due to ice block formation therein.SOLUTION: A blow-by gas discharge structure 1 comprises: an engine 2 of a vehicle; a frame 3; an engine mount 4 for connecting the engine 2 and the frame 3 while absorbing relative displacement difference between the engine 2 and the frame 3; and a blow-by gas hose 5 for discharging blow-by gas, in an engine 2 at the side of a crankcase as a result of leakage through a gap between the cylinder and the piston of the engine 2, into the atmosphere. The blow-by gas hose 5 is connected to the frame 3. The blow-by gas hose 5 is subject to the relative displacement difference between the engine 2 and the frame 3 caused by vibration of the engine 2 as a source of the relative displacement. Even if water freezes inside the blow-by gas hose 5, the blow-by gas hose 5 is subject to forcible displacement. Thus, the blow-by gas discharge structure enables a simple structure to prevent the blow-by gas hose 5 from ice accretion on an inner wall thereof and from blockage due to ice block formation therein.SELECTED DRAWING: Figure 1

Description

The present invention relates to a blow-by gas discharge structure.

A blow-by gas hose is known that discharges blow-by gas leaking from between an engine cylinder and a piston to the crankcase side of an engine into the atmosphere. For example, in Patent Document 1, in a motorcycle, a blow-by gas hose extending from an engine fixed to a pipe constituting a frame body by a fixing member is communicated with the pipe, and blow-by gas is discharged through the pipe. The technology to do is disclosed. Further, Patent Document 2 discloses a technique in which a blow-by gas hose outlet is arranged in the vicinity of a flywheel housing covering an engine flywheel, and blow-by gas in the vicinity of the outlet is heated by the flywheel housing. ..

Jikkai Sho 59-39711 Japanese Unexamined Patent Publication No. 2016-183604

By the way, in an open system in which blow-by gas does not circulate in the engine, especially in an extremely cold environment, the water discharged from the engine freezes inside the blow-by gas hose during long idle operation, and the blow-by gas hose is blocked by the formation of ice blocks. there is a possibility. However, the technique as described in Patent Document 1 is insufficient in the effect of preventing icing on the inner wall of the blow-by gas hose and preventing the blow-by gas hose from being blocked due to the formation of ice blocks. Further, even the technique as described in Patent Document 2 is insufficient in the effect of preventing icing on the inner wall of the blow-by gas hose and preventing the blow-by gas hose from being blocked due to the formation of ice blocks, and requires a complicated configuration.

Therefore, an object of the present invention is to provide a blow-by gas discharge structure capable of preventing icing on the inner wall of a blow-by gas hose and, by extension, preventing blockage of the blow-by gas hose due to formation of ice blocks by a simple configuration.

The present invention relates to an engine mount that connects the engine and the frame while buffering the relative displacement difference between the vehicle engine, the vehicle frame, and the engine and the frame, and the engine from between the cylinder and the piston of the engine. The blow-by gas hose is provided with a blow-by gas hose that discharges the leaked blow-by gas to the atmosphere on the side of the crankcase, and the blow-by gas hose has a blow-by gas discharge structure connected to a frame.

According to this configuration, the engine is connected to the engine of the vehicle, the frame of the vehicle, the engine mount that connects the engine and the frame while buffering the relative displacement difference between the engine and the frame, and the engine from between the cylinder and the piston of the engine. In the blow-by gas discharge structure equipped with a blow-by gas hose that discharges the blow-by gas leaked to the side of the crank case, the blow-by gas hose is connected to the frame, so that the engine and the frame have the engine as a vibration source. Relative displacement difference can be given to the blow-by gas hose, and even if the water freezes inside the blow-by gas hose, the blow-by gas hose is forcibly displaced, so that the blow-by gas hose can be attached to the inner wall by a simple configuration. It is possible to prevent ice and thus prevent the blow-by gas hose from being blocked due to the formation of ice blocks.

Further, it is preferable that the blow-by gas hose extends in one of the front and rear directions of the vehicle, one of the left and right directions, and one of the upper and lower directions. ..

According to this configuration, the blow-by gas hose extends in one of the front and rear directions of the vehicle, one of the left and right directions, and one of the upper and lower directions. Even if the water content freezes inside the blow-by gas hose, the frozen water content is likely to be discharged from the inside of the blow-by gas hose extending in one direction to the outside.

Further, it is preferable that the blow-by gas hose extends below the vehicle.

According to this configuration, the blow-by gas hose extends below the vehicle, so even if the water freezes inside the blow-by gas hose, gravity freezes the blow-by gas hose from the inside to the outside. Moisture is easily discharged.

Further, it is preferable that the blow-by gas hose can be deformed according to the relative displacement difference between the engine and the frame.

According to this configuration, the blow-by gas hose can be deformed according to the relative displacement difference between the engine and the frame, so even if the moisture freezes inside the blow-by gas hose, it corresponds to the relative displacement difference between the engine and the frame. Frozen water is easily discharged from the inside of the blow-by gas hose that deforms to the outside.

According to the blow-by gas discharge structure of the present invention, it is possible to prevent icing on the inner wall of the blow-by gas hose and thus prevent the blow-by gas hose from being blocked due to the formation of ice blocks by a simple configuration.

(A) is a side view showing a blow-by gas discharge structure according to an embodiment, and (B) is a plan view of a blow-by gas discharge structure according to an embodiment.

Hereinafter, the blow-by gas discharge structure according to the embodiment of the present invention will be described in detail with reference to the drawings. As shown in FIGS. 1A and 1B, the blow-by gas discharge structure 1 of the present embodiment has a relative displacement between the engine 2 of the vehicle, the frame 3 of the vehicle, and the engine 2 and the frame 3. An engine mount 4 for connecting the engine 2 and the frame 3 is provided while buffering the difference. Vehicles include large vehicles, medium-sized vehicles, semi-medium-sized vehicles, ordinary vehicles, large-sized special vehicles, and small-sized special vehicles specified by the Road Traffic Law under the jurisdiction of the National Police Agency. Vehicles include, for example, vehicles that are applied in frigid regions.

The engine mount 4 cushions the relative displacement difference between the engine 2 and the frame 3 with a cushioning material such as rubber. The relative displacement difference between the engine 2 and the frame 3 means, for example, the difference between the displacement of vibration due to the rotational movement of the engine 2 and the stationary frame 3. Due to the engine mount 4, the vibration due to the rotational movement of the engine 2 is not directly transmitted to the frame 3, and the engine 2 is displaced separately with respect to the frame 3.

The blow-by gas discharge structure 1 further includes a blow-by gas hose 5 that discharges blow-by gas leaking from between the cylinder and the piston of the engine 2 toward the crankcase side of the engine 2 into the atmosphere. In this embodiment, an open system in which blow-by gas is not circulated in the engine is assumed. The blow-by gas hose 5 is connected to the frame 3 via the connecting portion 6. In the present embodiment, the vicinity of the exhaust port of the blow-by gas hose 5 is connected to the frame 3.

The blow-by gas hose extends in one of the front and rear directions of the vehicle, one of the left and right directions, and one of the upper and lower directions. For example, in the present embodiment, the blow-by gas hose 5 extends to the left shown in the positive direction of the Y-axis in FIG. 1, and then extends to the rear shown in the negative direction of the X-axis while extending to the left and the Z-axis. Extends downward to reach the connecting portion 6, and extends downward from the connecting portion 6. More than half of the blow-by gas path of the blow-by gas hose 5 extends below the vehicle.

The blow-by gas hose 5 is deformable according to the relative displacement difference between the engine 2 and the frame 3. The blow-by gas hose 5 is made of a material that is flexible and does not have brittleness at extremely low temperatures. .. The blow-by gas hose 5 is made of, for example, silicon rubber, polytetrafluoroethylene, or the like.

When the blow-by gas hose 5 is not connected to the frame 3 as in the conventional case, the blow-by gas hose 5 vibrates as a whole together with the engine 2. Therefore, a part of the blow-by gas hose 5 is not significantly displaced as compared with the other parts. In this case, if the water freezes inside the blow-by gas hose 5, icing on the inner wall of the blow-by gas hose 5 tends to proceed. Therefore, there is a possibility that the blow-by gas hose 5 may be blocked due to the formation of ice blocks. When the blow-by gas hose 5 is blocked, the internal pressure of the crankcase rises, and there is a concern that the exhaust gas aftertreatment system may be damaged due to oil discharge from the turbo.

On the other hand, according to the present embodiment, the engine 2 of the vehicle, the frame 3 of the vehicle, the engine mount 4 that connects the engine 2 and the frame 3 while buffering the relative displacement difference between the engine 2 and the frame 3 and the engine mount 4. In the blow-by gas discharge structure 1 provided with the blow-by gas hose 5 that discharges the blow-by gas leaked from between the cylinder and the piston of the engine 2 to the crank case side of the engine 2 into the atmosphere, the blow-by gas hose 5 is attached to the frame 3. Since they are connected, the relative displacement difference between the engine 2 and the frame 3 using the engine 2 as a vibration source can be given to the blow-by gas hose 5, and even if the water content freezes inside the blow-by gas hose 5, the blow-by gas hose 5 Is forcibly displaced, so that the blow-by gas hose 5 can be prevented from landing on the inner wall of the blow-by gas hose 5 and the blow-by gas hose 5 can be prevented from being blocked due to the formation of ice blocks by a simple configuration.

Usually, in order to prevent icing on the inner wall of the blow-by gas hose 5, it is common to add an element for removing water and to arrange a heat insulating material or a heater to prevent freezing. .. However, according to the present embodiment, the greatest advantage is that no cost is required for such a response.

Further, according to the present embodiment, the blow-by gas hose 5 extends in one of the front and rear directions of the vehicle, one of the left and right directions, and one of the upper and lower directions. Therefore, even if the water content freezes inside the blow-by gas hose 5, the frozen water content is likely to be discharged from the inside of the blow-by gas hose extending in one direction to the outside.

Further, according to the present embodiment, since the blow-by gas hose 5 extends below the vehicle, even if the water freezes inside the blow-by gas hose 5, the blow-by gas hose 5 extends downward due to gravity. Frozen water is easily discharged from the inside to the outside.

Further, according to the present embodiment, since the blow-by gas hose 5 can be deformed according to the relative displacement difference between the engine 2 and the frame 3, even if the water content freezes inside the blow-by gas hose 5, the engine 2 and the frame 3 are deformed. Frozen water is easily discharged from the inside of the blow-by gas hose 5, which is deformed according to the relative displacement difference from the third.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments and is implemented in various forms. For example, the shape, arrangement, quantity, and material of the blow-by gas hose 5 can be changed as appropriate.

1 ... Blow-by gas discharge structure, 2 ... Engine, 3 ... Frame, 4 ... Engine mount, 5 ... Blow-by gas hose, 6 ... Connecting part.

Claims (4)

With the engine of the vehicle
With the frame of the vehicle
An engine mount that connects the engine and the frame while buffering the relative displacement difference between the engine and the frame.
A blow-by gas hose that discharges blow-by gas leaking from between the cylinder and piston of the engine to the crankcase side of the engine into the atmosphere.
With
The blow-by gas discharge structure in which the blow-by gas hose is connected to the frame. According to claim 1, the blow-by gas hose extends in one of the front and rear directions of the vehicle, one of the left and right directions, and one of the upper and lower directions. The blow-by gas discharge structure described. The blow-by gas discharge structure according to claim 1 or 2, wherein the blow-by gas hose extends below the vehicle. The blow-by gas discharge structure according to any one of claims 1 to 3, wherein the blow-by gas hose is deformable according to the relative displacement difference between the engine and the frame.

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