JPH04237831A - Breather device of motorcycle - Google Patents

Abstract

PURPOSE:To obtain a breather device of motorcycle that can prevent the high temperature of a breather chamber without turning to running wind, and without providing a special cooling device. CONSTITUTION:When a breather device is provided on a motorcycle provided with a cooling water pump 46, a breather chamber 47c is formed on a housing 47 of the cooling pump 46 in an integrated manner in such a way that a blade axis 48a is surrounded thereby, and a breather pipe 49a is connected to the breather chamber 47c.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a breather device for a motorcycle, and more particularly to an improvement in the arrangement position of a breather chamber.

0002

[Prior Art] A breather device for a motorcycle is used to prevent the internal pressure of a crankcase or transmission case from increasing due to an increase in oil temperature, etc., and the breather device is used to connect the inside of these cases and a breather chamber. The structure is connected by pipes. Thereby, a certain amount of the air inside the case is released into the breather chamber, thereby avoiding an increase in the internal pressure of the case, and at the same time, oil mist mixed in the air is stored in the breather chamber.

0003

However, in the above-mentioned breather device, the air introduced into the breather chamber from the crankcase or the like is relatively high-temperature hot air, and therefore, if left as is, the temperature of the breather chamber becomes high. Therefore, conventionally, the breather chamber is cooled by running air or the like. However, in the case where the vehicle is cooled by running wind, the breather chamber needs to be installed in a position where it is easily exposed to the running wind, which imposes restrictions on the installation position. The present invention has been made in view of the above-mentioned conventional situation, and an object of the present invention is to provide a breather device for a motorcycle that can prevent the temperature of the breather chamber from becoming high without being affected by running wind or without providing a special cooling device. The purpose is

0004

[Means for Solving the Problems] The present invention provides a breather device for a motorcycle equipped with a cooling water pump driven by an engine, in which a breather chamber is integrally formed in the housing of the cooling water pump so as to surround a blade shaft. , a breather pipe is connected to the breather chamber.

[0005]

According to the breather device for a motorcycle according to the present invention, since the breather chamber is integrally formed in the housing of the cooling water pump, the breather chamber is constantly cooled by the cooling water. Therefore, it is possible to prevent the temperature of the breather chamber from rising due to hot air from the crankcase or the like without providing a special cooling device. Furthermore, since the structure is not designed to be cooled by the running wind, the location of the breather chamber is not restricted to a position that is easily exposed to the running wind.

[0006]

Embodiments Hereinafter, embodiments of the present invention will be explained with reference to the drawings. 1 to 4 are diagrams for explaining a breather device for a motorcycle according to an embodiment of the present invention, in which FIG. 1 is a cross-sectional plan view thereof, FIG. 2 is a cross-sectional plan view of the entire engine unit, and FIGS. 4 is a left side view of the motorcycle.

In the figure, reference numeral 1 denotes a scooter type motorcycle, and its body frame 2 has a head pipe 3 connected to the upper end of a vertical side 4a of a main frame 4 which is approximately L-shaped in side view, and a horizontal side 4b. The front ends of a pair of left and right side frames 5a, 5a are connected near the center, and both side frames 5a are connected to each other.
, 5a are raised upward and extended rearward, making this a so-called underbone type. A front fork 7, which pivotally supports a front wheel 6 at its lower end, is supported by the head pipe 3 so as to be steerable left and right.
A steering handle 8 is fixed to the upper end of the steering shaft 7a. Further, a fuel tank 14 is provided above the front portions of the left and right side frames 5a, 5a, and a storage box 15 is provided above the rear portions of the left and right side frames 5a, 5a. A tandem seat 16 is arranged to cover the upper part. Furthermore, the area around the front fork 7, the footrest, and the lower part of the tandem seat 16 of the motorcycle 1 is surrounded by a body cover 17. In addition, the above left and right side frames 5a, 5a
A unit swing type engine unit 10 is attached to the rear bending portion 5b of the unit via a suspension bracket fixed to the rear bending portion 5b.
is suspended.

The engine unit 10 is formed by integrating an engine body 12 and a transmission device 11. The engine body 12 has an air-cooled cylinder body 22 and a water-cooled cylinder head 23 stacked and fastened substantially horizontally to the front wall of a left and right split crankcase 18b, and a piston 24 inserted into the cylinder body 22 is connected to a connecting rod. 2
5 is connected to the crankshaft 26.

The right protruding end of the crankshaft 26 includes:
Rotating body 27a of flywheel magnetic generator 27
is fixed, and a power generating coil 27b fixed to the right side wall of the crankcase 18b is accommodated in the rotating body 27a. Further, a crank pulley 27d is integrally formed with the boss portion 27c of the rotating body 27a.

Further, a cam sprocket 29a is fixed to one end of a camshaft 28 disposed within the cylinder head 23, and a sprocket 29a is fixed to one end of the camshaft 28 disposed within the cylinder head 23. The cam chain 29c is wound around.

The transmission device 11 is connected to the crankcase 1.
Transmission case body 18a integrally formed on the left side of 8b
It has a structure in which a continuously variable transmission mechanism 20, a centrifugal clutch 30, and a speed reduction mechanism 21 are disposed within a transmission case 19 consisting of a case cover 19a which is bolted and fixed to the transmission case 19.

The continuously variable transmission mechanism 20 is constructed by connecting a driving pulley 31 mounted on the left end of the crankshaft 26 and a driven pulley 32 disposed at the rear of the transmission case 19 with a V-belt 33. The driven pulley 32 is connected via the centrifugal clutch 30 to a clutch shaft 34 which is pivotally supported by the transmission case body 18a.

The drive pulley 31 is connected to the crankshaft 26.
It consists of a fixed pulley half 31a that is fitted and fixed to the left end of the pulley, and a movable pulley half 31b that is fitted to the crankshaft 26 so as to be slidable in the axial direction. A roller weight 36 is disposed between the outer surface of the movable pulley half 31b and a guide plate 35 fitted and fixed to the crankshaft 26, and a seal plate 37 is disposed outside the guide plate 35. It is arranged. This seal plate 37 is an annular member made of resin, and its outer circumferential portion is fixed to the outer circumferential portion of the movable pulley main body 31b, and its inner circumferential portion is in contact with a one-way clutch 38 fixed to the crankshaft 26. This prevents the grease filled in the roller weight 36 portion from flowing out. In addition, 31c
are air blowing vanes integrally formed on the outer surface of the fixed pulley half 31a.

The driven pulley 32 is a fixed pulley half 32
a and a movable pulley half 32b, and the fixed pulley half 32a is connected to the cylindrical body 39 of the centrifugal clutch 30.
Fixed. The movable pulley half 32b is supported by the cylindrical body 39 so as to be movable in the axial direction, and is supported by a spring 40.
The pulley half 32a is biased in a direction that narrows the distance between the fixed pulley half 32a and the fixed pulley half 32a.

The centrifugal clutch 30 has a clutch weight 42 disposed between the cylindrical body 39 supported by the clutch shaft 34 and a clutch case 41 fixed to the clutch shaft 34. 32 becomes higher, the clutch weight 42 moves closer to the clutch case 4.
1 and thereby transmits power to the clutch shaft 34.

The speed reduction mechanism 21 is connected to the clutch shaft 34.
The small gear 34a is meshed with the large gear 44 of the rear wheel shaft 43 via an intermediate gear (not shown). The rear wheel shaft 43 is pivotally supported by the transmission case main body 18a and an inner case 18c bolted to the transmission case main body 18a via bearings, and the rear wheel 13 is fixed to the rear wheel shaft 43.

The circumference of the cylinder body 22 and the generator 27 are surrounded by a shroud 5 constituting a cooling air passage.
surrounded by 1. A bulging portion 51a is formed in the left side portion of the cylinder body 22 of the shroud 51, and an exhaust hole is formed in the lower part of the bulging portion 51a. Further, a discharge duct 52b is connected to a front discharge port 18e formed at the front of the transmission case 19 via a discharge pipe 52a. The discharge duct 52b is inserted into the shroud 51, bent downward and extended, and is connected to the hole 51b.
It opens to the road through the road.

Furthermore, a maintenance opening 51c is formed in a portion of the generator cover portion 51g of the shroud 51 surrounding the generator 27 that faces the crankshaft 26;
This is closed with a cap 53. Further, an exhaust hole 51d is formed behind the opening 51c of the shroud 51, and a generator 27 is further provided inside the exhaust hole 51d.
A positioning protrusion 51e for adjusting the mounting angle of the rotating body 27a with respect to the crankshaft 26 is integrally formed. Furthermore, an air introduction opening 51f is formed in the right portion of the cylinder body 22 of the shroud 51. A radiator 54 is disposed to cover the opening 51f, and a blower fan 55 is disposed inside the radiator 54.

The blower fan 55 is composed of an impeller 56 and a fan pulley 57 disposed outside the impeller 56 in the vehicle width direction, and the fan pulley 57 is mounted on the right end of the crankshaft 26. It is connected to the crank pulley 27d with a V-belt 62. The impeller 56 is connected to a support portion 18 integrally formed on the right side wall of the crankcase 18b.
d is fixed to a rotary cylinder body 59 which is pivotally supported via a bearing 58. The fan pulley 57 has a fixed pulley half 57a fixed to the rotating cylinder 59, and a right end of a sliding shaft 60 that is slidably inserted in the rotating cylinder 59 in the axial direction and is spline-fitted. It consists of a fixed movable pulley half 57b.

A biasing mechanism 61 is disposed between the impeller 56 and the cylinder body 22. The biasing mechanism 61
is a spring seat 63a attached to the tip of the sliding shaft 60.
and a spring seat 63b inserted into the inner end of the rotating cylinder 59.
This structure has a spring 63c interposed between the two. As a result, the biasing mechanism 61 causes the movable pulley half 57b to
A tension adjustment mechanism 64 is configured to change the diameter of the fan pulley 57 and absorb the elongation of the V-belt 62 by urging the fan pulley half 57a toward the fixed pulley half 57a.

A cooling water pump 46 is mounted on the left side wall of the cylinder head 23. The pump 46 includes an impeller 4 in a blade chamber 47e of a pump housing 47 consisting of a housing body 47a and a housing cover 47b.
8 is arranged. The blade chamber 47e
One end of a cooling water hose 49b is connected to the radiator 54, and the other end of the hose 49b is connected to the radiator 54. Further, the blade shaft 48a of the impeller 48 is connected to the camshaft 2.
The camshaft 8 is disposed coaxially with the camshaft 28, and is detachably connected to the camshaft 28. Then, the housing body 4
7a has a breather chamber 47 surrounding the blade shaft 48a.
c is formed, and the right opening of the breather chamber 47c is closed with an end plate 50. The housing body 47
In a, the hose joint 47d is connected to the breather chamber 47c.
One end of a breather pipe 49a is connected to the joint 47d. The other end of this breather pipe 49a is connected to the crankcase 18b, thereby forming a breather device that releases air within the crankcase 18b to the breather chamber 47c.

Next, the effects of this embodiment will be explained. In the breather device of this embodiment, the crankcase 18b
If the internal pressure increases due to a rise in oil temperature, etc., Case 1
A part of the air in the air inside 8b is introduced into the breather chamber 47c through the breather pipe 49, thereby preventing an increase in the internal pressure of the crankcase 18b, and the oil mist mixed in the air is removed from the breather chamber 47c. It will be stored in the chamber 47c. In this case, since the air from the crankcase 18b has a relatively high temperature, there is a risk that the temperature of the breather chamber 47c will rise. However, since the breather chamber 47c of this embodiment is constantly cooled by the cooling water in the cooling water pump 46, the temperature rise due to the hot air can be prevented without providing a special cooling device. Further, since the breather chamber 47c of this embodiment is integrally formed with the pump housing 47 of the cooling water pump 46, there is no need to take up a special space for arranging the breather chamber. Furthermore, since the device of this embodiment does not require cooling by the wind while traveling, it can be placed anywhere as long as the cooling water pump is disposed, and is not restricted to the position where it is exposed to the wind while traveling.

[0023]

As described above, according to the breather device for a motorcycle according to the present invention, since the breather chamber is integrally formed in the housing of the cooling water pump, the breather chamber is constantly cooled by the cooling water. This has the effect of preventing a rise in temperature in the breather chamber due to hot air from the crankcase etc. without providing a special cooling device, and also avoids restrictions on placement since it is not necessary to be exposed to running air.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional plan view of a breather device according to an embodiment of the present invention.

FIG. 2 is a developed cross-sectional view showing the overall configuration of an engine unit equipped with the above device.

FIG. 3 is a left side view of a motorcycle equipped with the above engine.

FIG. 4 is a left side view of the motorcycle.

[Explanation of symbols]

1　Motorcycle 10 Engine unit 46 Cooling water pump 47 Pump housing 47c Breather room 48a Feather shaft 49a Breather pipe

Claims (1)

[Claims] 1. A breather device for a motorcycle equipped with a cooling water pump driven by an engine, wherein a breather chamber is integrally formed in the housing of the cooling water pump so as to surround a blade shaft, and a breather pipe is installed in the breather chamber. A breather device for a motorcycle, characterized in that it is connected.