CN215979550U

CN215979550U - Engine blow-by gas arrangement

Info

Publication number: CN215979550U
Application number: CN202122041010.8U
Authority: CN
Inventors: 周祖诠; 林信昀; 赵晟豪
Original assignee: Sanyang Industry Co Ltd
Current assignee: Sanyang Industry Co Ltd
Priority date: 2021-08-27
Filing date: 2021-08-27
Publication date: 2022-03-08
Anticipated expiration: 2031-08-27

Abstract

The air blowing and leaking device of the engine is arranged in a crankcase of the engine, the crankcase comprises a right crankcase and a left crankcase, the crankcase is internally provided with a crankshaft, a driving piece fixedly arranged on the crankshaft, a balance shaft, a driving piece fixedly arranged on the balance shaft and an air blowing and leaking structure, and the crankshaft and the balance shaft synchronously move. The air-blow-by structure of the engine of the present invention is located between the right crankcase and the right crankcase side cover covering the right crankcase, and overlaps with the balance shaft portion, as viewed from the right side of the engine. Therefore, the utility model can reduce the dimension of the engine in the vertical direction and optimize the configuration space of the engine and the frame.

Description

Engine blow-by gas arrangement

Technical Field

The present invention relates to an engine blow-by gas arrangement, and more particularly to an engine blow-by gas arrangement suitable for an internal combustion motorcycle.

Background

When the internal combustion engine is started, during the compression stroke and the power stroke, a part of the unburned gas mixture may be introduced into the crankcase along the gap between the piston assembly and the cylinder wall, which may cause an increase in the pressure (gas pressure) in the crankcase. When the piston descends, the gas in the crankcase can be extruded, and when the pressure of the crankcase is not balanced, the descending piston causes resistance, the amount of the air blown and leaked in the interior is increased all the time, and the piston cannot descend to cause the flameout of the engine. Therefore, the best solution for releasing the pressure in the crankcase is to provide an engine blow-by structure with a vent for venting the air.

What is commonly referred to as BLOW-BY GAS (BLOW-BY GAS) includes vaporized oil and other gases in the crankcase (e.g., water vapor, fuel GAS leaking from the engine piston chamber without complete combustion). However, since environmental concerns are becoming more important and direct discharge causes air pollution, regulations stipulate that blow-by gases must not be discharged directly to the atmosphere. In addition, after the blow-by gas enters the crankcase, the combustion chamber of the motorcycle engine must be guided by a proper pipeline to return to the air intake system and the combustion chamber for burning again. The main component of the blow-by gas which flows down to the crankcase is gasoline, after the gasoline is mixed with the engine oil in the oil pan, the oil gas of the gasoline and the engine oil must be separated by an oil-gas separation structure, the engine oil is stopped and returned to the oil pan, the pure gasoline oil gas is discharged, the gas is guided back to the engine for combustion, the oil is stored in the transparent oil storage pipe, and the gasoline is discharged after the oil is quantitatively accumulated.

In the prior art, an air-blow structure of an engine crankcase is usually provided with an oil-air separation structure between a left crankcase and a right crankcase, and the traditional oil-air separation structure for a motorcycle is provided with a centrifugal type and a labyrinth type, and the centrifugal type can be arranged on a side cover of a cylinder head which is coaxial with a camshaft. The labyrinth may be selected at the cylinder head cover or crankcase near and above the cylinder.

Fig. 1 is a schematic side view of a conventional blow-by gas arrangement of an engine, the conventional blow-by gas arrangement of the engine is disposed in an engine 80, the engine 80 has a cylinder head 81, a cylinder 82 and a crankcase 90 connected to each other, the crankcase 90 contains a crankshaft 92, a balance shaft 94 and a blow-by gas structure 97, the crankshaft 92 and the balance shaft 94 operate synchronously.

As shown in fig. 1, the blow-by gas structure 97 of the conventional engine 80 is in the upper part of the right crankcase, so that the volume above the engine 80 becomes large, and the problem of interference with the vehicle frame is easily caused.

The inventor has therefore earnestly invented the spirit of the present invention, and has earnestly invented an "engine blow-by gas arrangement" which can solve the above-mentioned problems, and the present invention has been completed through several studies and experiments.

SUMMERY OF THE UTILITY MODEL

The main object of the present invention is to provide an engine blow-by gas arrangement in which a blow-by gas structure originally provided above a crankcase is arranged between a right crankcase and a right crankcase side cover of an engine, and the relative position of the blow-by gas structure overlaps with a balance shaft portion when viewed from the right side of the engine. Therefore, the dimension of the engine in the vertical direction can be reduced, and the configuration space of the engine and the frame can be optimized.

In order to achieve the above object, the present invention provides an engine blow-by gas arrangement set in a crankcase of the engine, the crankcase includes a right crankcase and a left crankcase, the crankcase includes a crankshaft, a driving member fixed on the crankshaft, a balance shaft, a driving member fixed on the balance shaft, and a blow-by gas structure, the crankshaft and the balance shaft operate synchronously.

The utility model is mainly characterized in that: the blow-by gas structure is located between the crankcase and a crankcase side cover covering the crankcase, as viewed from the right side of the engine, and overlaps with the balance shaft.

The driving member may be a driving gear, and the transmission member may be a transmission gear, the driving gear and the transmission gear being engaged with each other to transmit the power of the crankshaft to the balance shaft, so that the balance shaft and the crankshaft are synchronously operated.

The driving member may be a driving wheel, and the transmission member is a transmission wheel, and a transmission chain is disposed between the driving wheel and the transmission wheel for transmitting the power of the crankshaft to the balance shaft.

Both the foregoing general description and the following detailed description are exemplary and explanatory in nature to further illustrate the scope of the utility model as claimed. Other objects and advantages of the present invention will become apparent from the following description and drawings.

Drawings

FIG. 1 is a schematic side view of an engine with a blow-by gas configuration according to the prior art.

FIG. 2 is a schematic side view of an engine with blow-by gas configuration according to a preferred embodiment of the present invention.

FIG. 3 is a schematic side view of the left crankcase of an engine according to a preferred embodiment of the utility model.

FIG. 4 is a schematic view of the inside of the right crankcase of an engine in accordance with a preferred embodiment of the utility model.

FIG. 5 is a schematic cross-sectional view of an engine blow-by configuration in accordance with a preferred embodiment of the present invention.

Description of the main element symbols:

10 Engine

11 cylinder head

12 cylinder

20 crankcase

201 right crankcase

202 left crankcase

22 crankshaft

23 drive element

24 balance shaft

25 driving member

27 blow-by gas structure

271 baffle

28 Right crankcase side cover

80 Engine

81 cylinder head

82 air cylinder

90 crankcase

92 crankshaft

94 balance shaft

97 air-leakage structure

Detailed Description

Fig. 2, 3 and 4 are a schematic side view, a schematic side view and a schematic inside view of an engine crankcase according to a preferred embodiment of the utility model. The engine blow-by gas arrangement of the present embodiment is disposed in an engine 10, and the engine 10 has a cylinder head 11, a cylinder 12 and a crankcase 20 connected to each other.

The crankcase 20 includes a right crankcase 201 and a left crankcase 202, the crankcase 20 is provided with a crankshaft 22, a driving member 23 fixed on the crankshaft 22, a balance shaft 24, a transmission member 25 fixed on the balance shaft 24, and a blow-by gas structure 27, the driving member 23 and the transmission member 25 are connected to each other to transmit the power of the crankshaft 22 to the balance shaft 24, so that the crankshaft 22 and the balance shaft 24 operate synchronously.

In the present embodiment, as shown in fig. 4, the blow-by gas structure 27 has a labyrinth type oil-gas separation structure formed by a plurality of partition plates 271.

In this embodiment, the driving member 23 is a driving gear, and the transmission member 25 is a transmission gear, and the driving gear and the transmission gear are engaged with each other to transmit the power of the crankshaft 22 to the balance shaft 24.

Fig. 5 is a schematic cross-sectional view of an engine blow-by gas configuration according to a preferred embodiment of the utility model, and is shown in fig. 2 to 4. In the present embodiment, when viewed from the right side of the engine 10, the blow-by structure 27 is located between the right crankcase 201 and the right crankcase side cover 28 covering the right crankcase 201, and the blow-by structure 27 partially overlaps the balance shaft 24.

Therefore, as shown in fig. 2, compared with the conventional engine blow-by gas arrangement shown in fig. 1, the present embodiment can reduce the dimension of the engine in the vertical direction, and can optimize the arrangement space between the engine and the frame.

The above-mentioned embodiments are merely exemplary for convenience of description, and the scope of the claims of the present invention should be determined by the scope of the claims and not by the limitations of the above-mentioned embodiments.

Claims

1. An engine blow-by gas configuration is assembled in a crankcase of the engine, the crankcase comprises a right crankcase and a left crankcase, the crankcase is provided with a crankshaft, a driving piece fixed on the crankshaft, a balance shaft, a driving piece fixed on the balance shaft and a blow-by gas structure, the crankshaft and the balance shaft act synchronously; the method is characterized in that: viewed from the right side of the engine, the blow-by gas structure is located between the right crankcase and a right crankcase side cover covering the right crankcase, and is overlapped with the balance shaft.

2. The engine blow-by arrangement of claim 1, wherein the driving member is a driving gear, and the transmission member is a transmission gear, the driving gear and the transmission gear being engaged with each other to transmit the power of the crankshaft to the balance shaft.

3. The engine blow-by arrangement of claim 1, wherein the driving member is a driving wheel, the transmission member is a transmission wheel, and a transmission chain is disposed between the driving wheel and the transmission wheel for transmitting the power of the crankshaft to the balance shaft.