JP2005009445A - Cooling water chamber for v-type engine and breather chamber structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cooling water chamber for a V-type engine and a breather chamber structure capable of preventing cooling water from leaking to a side of a breather chamber, dispensing with a complicated seal structure between the cooling water chamber and the breather chamber, and reducing man-hour in assembly in a line. <P>SOLUTION: In the cooling water chamber for the V-type engine and the breather chamber structure, a cam chain 29 driving a camshaft by driving force of a crankshaft 22 is disposed outside a crankcase 23. A flow passage chamber 46 is formed in a V-shaped bank of the V-type engine 21 along an axial direction of the crankshaft 22. The cooling water chamber 47 is formed in one side of the flow passage chamber 46 in a longitudinal direction and the breather chamber 48 is formed in the other side, and the cooling water chamber 47 and the breather chamber 48 are separated with a partition wall part 49 in a direction perpendicular to the longitudinal direction. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a structure of a cooling water chamber and a breather chamber in a V-type engine.
[0002]
[Prior art]
Conventionally, some motorcycles are equipped with a V-type engine as shown in FIGS. 8 and 9, and the V-type engine has four bearing portions 2a, 2b, 2c, It is rotatably provided by 2d. Further, a cam chain 5 is wound between a pulley 1a provided at an intermediate portion of the crankshaft 1 and pulleys 3a, 4a provided on the intake camshaft 3 and the exhaust camshaft 4, so that the crankshaft When 1 is rotated, the camshafts 3 and 4 are rotated at a predetermined timing.
[0003]
In such a V-type engine, when the air-fuel mixture explodes in the combustion chamber, part of the exhaust gas passes between the piston and the cylinder and leaks out to the crank chamber 2e side. Since the leaked exhaust gas includes unburned gas, the exhaust gas is not exhausted as it is, but is circulated to the intake side and burned again.
[0004]
In addition, the crank chamber is filled with mist-like oil, and the oil is mixed with the unburned gas, so it cannot be recirculated to the intake side as it is. The unburned gas thus passed is passed through the breather chamber 7 of the flow passage chamber 6 formed in the V-shaped bank as shown by the arrow A in FIG. I try to let them.
[0005]
On the other hand, as shown in FIG. 9, the cooling water is heat-exchanged by circulating the cooling water between the cylinder block 10 and the radiator 11 by the cooling water pump 9.
[0006]
The cooling water sent from the cooling water pump 9 is sent to the plurality of cooling water chambers 8 in the flow passage chamber 6 as indicated by the arrow B, and the cooling water passages around the four cylinders from these cooling water chambers 8. 12 is sent.
[0007]
Here, since the cam chain 5 is provided in the central portion of the crankshaft 1, the water passage is blocked between the first and second cylinders and the third and fourth cylinders. Cooling water is directly supplied to each of the four cylinders from the cooling water chamber 8 of the flow passage chamber 6 in the bank. If it sees, the cooling water chamber 8 of this flow passage chamber 6 is formed in the length ranging over the 1st, 2nd cylinder side and the 3rd, 4th cylinder side.
[0008]
Examples of this type include those described in Patent Document 1, Patent Document 2, Patent Document 3, and Patent Document 4.
[0009]
[Patent Document 1]
Japanese Patent Publication No. 02-040850.
[0010]
[Patent Document 2]
Japanese Patent Publication No. 01-046692.
[0011]
[Patent Document 3]
No. 03-048337.
[0012]
[Patent Document 4]
Japanese Patent Publication No. 05-043870.
[0013]
[Problems to be solved by the invention]
However, in such a conventional one, the cooling water chamber 8 is provided in the first, second cylinder side and the third, fourth cylinder side in the flow passage chamber 6 provided in the V-shaped bank. Since the breather chamber 7 is formed next to the cooling water chamber 8, the cooling water chamber 8 and the breather chamber 7 are formed adjacent to each other. The cooling water must be prevented from leaking into the breather chamber 7, and the sealing structure between the two is complicated, and there is a problem that man-hours in line assembly can be reduced.
[0014]
Therefore, the present invention can prevent the cooling water from leaking to the breather chamber side, does not require a complicated seal structure between the cooling water chamber and the breather chamber, and can reduce the man-hours in the line assembly. It is an object to provide a cooling water chamber and a breather chamber structure.
[0015]
[Means for Solving the Problems]
In order to achieve the above object, according to the first aspect of the present invention, there is provided a cooling water chamber and a breather chamber of a V-type engine in which a cam chain for driving the camshaft by the driving force of the crankshaft is disposed outside the crankcase. A flow passage chamber is formed in the V-type bank of the V-type engine along the axial direction of the crankshaft, a cooling water chamber is provided on one side in the longitudinal direction of the flow passage chamber, and the other side is provided. A breather chamber is formed, and the cooling water chamber and the breather chamber are separated from each other by a partition wall in a direction perpendicular to the longitudinal direction.
[0016]
The invention described in claim 2 is characterized in that, in addition to the configuration described in claim 1, a cooling water pump is arranged outside the crankcase on one side where the cooling water chamber is formed.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described based on embodiments.
[0018]
1 to 7 show an embodiment of the present invention.
[0019]
First, the configuration will be described. Reference numeral 21 in the figure denotes a motorcycle 4-cylinder V-type engine. The crankshaft 22 of the engine 21 is rotatably supported by three bearing portions 23a, 23b, and 23c of a crankcase 23. Yes.
[0020]
The crankshaft 22 is formed with connecting rod mounting portions 22a at two locations, and two connecting rods 24 are rotatably mounted on the connecting rod mounting portions 22a via bearings.
[0021]
A starter one-way gear 25 is attached to the crankshaft 22 on one outer side of the crankcase 23, and a camshaft drive sprocket 22 d is integrally formed on the other outer side of the crankcase 23.
[0022]
As shown in FIG. 2, the camshaft drive sprocket 22d, the first intake sprocket 26a provided at the ends of the pair of left and right intake camshafts 26, and the approximate center of the sprockets 22d and 26a are disposed. A cam chain 29 is wound around the intermediate sprocket 28, and the driving force from the camshaft drive sprocket 22 d is transmitted to the intake camshaft 26 via the cam chain 29.
[0023]
Further, a connecting chain 32 is provided between the second intake sprocket 26 b having a smaller diameter than the first intake sprocket 26 a provided at the end of the intake camshaft 26 and the exhaust sprocket 30 a provided at the end of the exhaust camshaft 30. Is wound, and the intake camshaft 26 and the exhaust camshaft 30 are rotated in synchronization with each other.
[0024]
Furthermore, as shown in FIGS. 3 and 4, a cooling water pump 31 is provided on the side where the cam chain 29 is provided.
[0025]
That is, as shown in FIG. 4, the drive gear 33 rotated by the driving force of the crankshaft 22 is engaged with the driven gear 34, and the pump shaft 35 is rotated by the driven gear 34. As shown in FIG. 3, the impeller 36 provided at the tip of the compressor is rotated to suck the cooling water from the radiator 37 side, and the cooling water is supplied to the cylinder block 39 side for cooling. Thereafter, the cooling water is circulated through the radiator 37 again.
[0026]
As shown in FIG. 5, the pipe 40 extended from the cooling water pump 31 covers the cam chain 29 via a rubber hose 41 as shown in FIG. A cooling water passage 43 b formed in the chain cover 43 is connected to a cylinder portion 43 a formed in 43, and communicates with a cooling water passage 39 a formed in the cylinder block 39. The cooling water passage 39 a is formed inside the annular cam chain 29 and the rubber hose 41 is covered with a small cover 44. The chain cover 43 is wet by being filled with lubricating oil.
[0027]
Further, the cooling water passage formed in the cylinder block is connected to the cooling chamber 47 of the flow passage chamber 46 formed in the V-type bank of the V-type engine.
[0028]
The flow passage chamber 46 is formed along the axial direction of the crankshaft 22. A cooling water chamber 47 is formed on one side of the flow passage chamber 46 in the longitudinal direction, and a breather chamber 48 is formed on the other side. .
[0029]
The cooling water chamber 47 and the breather chamber 48 are separated by a partition wall 49 in a direction orthogonal to the longitudinal direction. Reference numeral 50 denotes an air vent hole of the cooling water chamber 47.
[0030]
As shown in FIG. 6, the cooling water passage 51 is extended from the cooling water chamber 47 to the left and right in a plan view, and the cooling water passage formed around the pair of the fourth cylinder 53 and the third cylinder 54 of the cylinder block 39. It is connected. The cooling water passage formed around the fourth and third cylinders 53 and 54 is connected to the cooling water passage formed around the second and first cylinders 55 and 56 adjacent to each other via the communication passage 57. Communicate.
[0031]
On the other hand, the breather chamber 48 formed in the flow passage chamber 46 has a plurality of first to fifth breather chambers 48a, 48b, 48c, 48d, and 48e, and each cylinder is provided in the first breather chamber 48a. Unburned gas leaking from 53 to 56 into the crank chamber 59 is introduced. A second breather chamber 48b is formed on the upper side of the first breather chamber 48a via an opening 48f. The third breather chamber 48c is formed on the second breather chamber 48b via an upper shielding rib 48g and a lower shielding rib 48h. Are formed adjacent to each other. A fourth breather chamber 48d is formed below the second breather chamber 48b via an opening 48j. Further, a fifth breather chamber is formed above the fourth breather chamber 48d via an opening 48k. 48e is formed. An oil return passage 60 is formed from the bottom surface of the fourth breather chamber 48d to the bottom surface of the crank chamber 59 as shown in FIGS. The fifth breather chamber 48e communicates with the air cleaner via the hose 61.
[0032]
Next, the operation will be described.
[0033]
When the air-fuel mixture is combusted in the combustion chamber 63, unburned gas leaks to the crank chamber 59 through a minute gap between the piston 64 and the inner wall of the cylinder 65, and this unburned gas is mixed with the mist-like lubricating oil. In this state, it is introduced into the breather chamber 48.
[0034]
In the breather chamber 48, while the unburned gas containing the lubricating oil sequentially passes through the first to fifth breather chambers 48a to 48e, gas and liquid are separated into the lubricating oil and the unburned gas. The separated lubricating oil is returned into the crank chamber 59 via the oil return passage 60.
[0035]
The unburned gas is sent to the air cleaner of the intake system via the hose 61 and burned again.
[0036]
On the other hand, the rotation of the crankshaft 22 causes the impeller 36 of the cooling water pump 31 to rotate via the drive gear 33 and the driven gear 34, whereby the cooling water is circulated between the radiator 37, the cylinder block 39, and the like.
[0037]
That is, the cooling water sent from the cooling water pump 31 to the cooling water chamber 47 of the flow passage chamber 46 is divided into right and left as shown in FIG. 6 and the cooling water passage around the fourth and third cylinders 53 and 54. The fourth and third cylinders 53 and 54 are cooled. Thereafter, the cooling water flows into a cooling water passage around the second and first cylinders 55 and 56 adjacent to the fourth and third cylinders 53 and 54, and the second and first cylinders 55 and 56 are cooled. Will be.
[0038]
In such a case, the cooling water chamber 47 and the breather chamber 48 are separated by the partition wall portion 49 in the direction orthogonal to the longitudinal direction and are independent from each other. There is no fear of leaking to the side, no seal is required between the cooling water chamber 47 and the breather chamber 48, the entire sealing structure of the flow passage chamber 46 is simplified, and the number of man-hours for line assembly can be reduced.
[0039]
Here, unlike the conventional case, the cam chain 29 is arranged outside the cylinder block 39, so that the adjacent fourth cylinder 53 and second cylinder 55, adjacent third cylinder 54 and first cylinder 56 are surrounded by each other. Since the formed cooling water passage can be communicated, it is not necessary to individually send the cooling water from the cooling water chamber 47 to the four cylinders 53 to 56, but to the fourth and third cylinders 53 and 54 side. The cooling water can be sent to the adjacent second and first cylinders 55 and 56 side.
[0040]
In addition, since the cooling water pump 31 is disposed outside the crankcase 23 on one side where the cooling water chamber 47 is formed, the path from the pump 31 to the cooling water chamber 47 can be shortened.
[0041]
【The invention's effect】
As described above, according to the first aspect of the present invention, the flow passage chamber is formed in the V-type bank of the V-type engine along the axial direction of the crankshaft, and the longitudinal direction of the flow passage chamber is defined. A cooling water chamber is formed on one side and a breather chamber is formed on the other side, and the cooling water chamber and the breather chamber are separated from each other by a partition wall in a direction perpendicular to the longitudinal direction. Therefore, it is possible to prevent the cooling water from leaking to the breather chamber side, unlike the conventional case, there is no need for a seal between the cooling water chamber and the breather chamber, and the seal structure of the flow passage chamber can be simplified. Man-hours in line assembly can be reduced.
[0042]
According to the second aspect of the present invention, since the cooling water pump is disposed outside the one crankcase where the cooling water chamber is formed, the path from the pump to the cooling water chamber can be shortened.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view taken along the center of a V-shape of a V-type engine according to an embodiment of the present invention.
FIG. 2 is a view showing a cam chain arrangement state and the like according to the embodiment;
FIG. 3 is an explanatory diagram showing a cooling water circulation path according to the embodiment;
4 is a cross-sectional view taken along line AA of FIG. 3 according to the same embodiment. FIG.
5 is a cross-sectional view taken along the line BB of FIG. 3 according to the same embodiment. FIG.
FIG. 6 is a schematic plan view showing four cylinders and flow passage chambers according to the same embodiment;
FIG. 7 is a cross-sectional view in a direction orthogonal to the crankshaft according to the same embodiment.
FIG. 8 is a schematic diagram showing the flow of engine cooling water and unburned gas in a conventional example.
FIG. 9 is an explanatory diagram showing a flow of cooling water in the conventional example.
[Explanation of symbols]
21 Engine 22 Crankshaft 23 Crankcase 24 Connecting rod 26 Intake camshaft 29 Cam chain 30 Exhaust camshaft 31 Cooling water pump 39 Cylinder block 46 Flow passage chamber 47 Cooling water chamber 48 Breather chamber 49 Bulkhead 59 Crank chamber

Claims (2)

The cam chain for driving the camshaft by the driving force of the crankshaft is a cooling water chamber and breather chamber structure of a V-type engine disposed outside the crankcase,
A flow passage chamber is formed in the V-shaped bank of the V-type engine along the axial direction of the crankshaft, a cooling water chamber is formed on one side in the longitudinal direction of the flow passage chamber, and a breather chamber is formed on the other side. And a cooling water chamber and a breather chamber structure of a V-type engine, wherein the cooling water chamber and the breather chamber are separated by a partition wall in a direction perpendicular to the longitudinal direction. The cooling water chamber and breather chamber structure of a V-type engine according to claim 1, wherein a cooling water pump is disposed outside the crankcase on one side where the cooling water chamber is formed.

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