JP3077320B2 - Engine breather device - Google Patents

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 an engine, and more particularly, to a breather device for an engine having a breather chamber in a liquid-tight chamber for storing lubricating oil.

[0002]

2. Description of the Related Art Some motorcycle engines have a starter clutch chamber that houses a starter clutch mechanism adjacent to a flywheel magnet operated by a crankshaft. The starter clutch mechanism rotates a crankshaft by operating a starter motor to start an engine.

[0003] The starter clutch chamber is formed by joining a crankcase and a starter clutch case at a mating surface, and is connected to a starter clutch main chamber accommodating a starter clutch mechanism and a starter clutch main chamber via a breather communication passage. And a breather chamber communicated therewith.

On the other hand, a magnet stator of a flywheel magnet is bolted to the starter clutch case at a position opposite to the starter clutch mechanism. Since the lower half of the magnet stator is formed so that the lead wire extraction side of the lower half projects toward the center of the engine more than the upper half, the outer wall of the starter clutch case is fixed to the substantially lower half of the magnet stator. It is configured in a planar shape that maintains the distance.

[0005] The mating surface of the crankcase and the starter clutch case is on the flywheel magnet side, and the starter clutch case is a member having a small oil storage volume. Further, the breather communication passage is formed in the crankcase with reference to the mating surface.

[0006]

When the breather chamber and the breather communication passage are configured as described above, when the motorcycle falls over to the starter clutch case side, the oil storage volume of the starter clutch case is small. The liquid level of the lubricating oil transferred to the clutch case may be higher than the level of the breather communication passage, and the lubricating oil may blow out of the engine through the breather chamber.

Further, in order to prevent this oil blowing,
Although it is conceivable to reduce the lubricating oil in the starter clutch main chamber, in this case, lubrication of the starter clutch mechanism may be insufficient.

The present invention has been made in consideration of the above circumstances, and it is possible to ensure that a sufficient amount of lubricating oil is provided in a liquid-tight chamber such as a starter clutch chamber and that the oil blows out through a breather chamber when the vehicle falls. It is an object of the present invention to provide a breather device for an engine that can prevent the occurrence of the engine.

[0009]

According to the present invention, an engine is provided with a liquid-tight chamber having a liquid-tight main chamber for storing lubricating oil and a breather chamber for eliminating pressure fluctuations and the like in the liquid-tight main chamber. The liquid-tight chamber is formed by joining a member having a large oil storage volume and a member having a small oil storage volume at a mating surface, and a breather communication passage communicating the breather chamber and the liquid-tight main chamber is provided with the oil storage chamber. A magnet stator formed on a member having a large volume on the basis of the mating surface and having a shape irregular in the center / outside direction of the engine is disposed adjacent to the member having a small oil storage volume, and a member having a small oil storage volume is provided. Is characterized in that the magnet stator is configured to have an uneven shape corresponding to the uneven shape.

[0010]

Therefore, according to the breather device for an engine according to the present invention, the motorcycle falls over to the liquid-tight chamber constituent member having a small oil storage volume, and the lubricating oil in the liquid-tight main chamber is reduced to the liquid-tight chamber having a small oil storage volume. When transferred to the constituent members, since the member having a small oil storage volume is formed in a convex shape toward the outside of the engine corresponding to the concave shape of the adjacent magnet stator toward the engine center,
A large amount of the lubricating oil is stored in the convex portion, and the oil level is lower than the mating surface of the liquid-tight chamber constituent members. As a result, the lubricating oil does not flow into the breather chamber through the breather communication passage formed on the basis of the mating surface, and is prevented from being blown out of the engine from the breather chamber.

Further, since the lubricating oil can be prevented from being blown out in this manner, the amount of the lubricating oil stored in the liquid-tight main chamber can be sufficiently ensured, and the equipment housed in the liquid-tight main chamber can be appropriately lubricated.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 is an overall side view showing a scooter type motorcycle.

This scooter type motorcycle has a steering wheel 3
Front wheel 1 which is steered by the rear wheel and rear wheel 2 which is driven by the engine 4
The step board 6 is laid with the gap between the handle 3 and the seat 5 lowered low, and the seat 5 is placed on the rear body 8 also serving as the storage box 7. The engine 4 is arranged and configured.

The engine 4 is a unit swing type engine integrated with the rear wheel 2. A support arm 9 at the lower front is pivotally supported by a body frame 10 so as to be vertically swingable, and an upper rear is a shock absorbing unit. Supported by 11 and shock suspended.

As shown in FIGS. 3 and 4, the unit swing type engine 4 has a crankcase 13 connected to the rear of a cylinder 12 which is inclined forward substantially horizontally. The rear wheel 2 located immediately behind the crankcase 13 is pivotally supported by a rear axle 15 at the rear of the swing case 14.

The crankcase 13 is formed by joining an L-side crankcase 13a and an R-side crankcase 13b at the center of the engine 4, and has a crankshaft 18 penetrated therein. The swing case 14 includes a vertically divided basic case 14 a and a case cover 14.
b. This basic case 14a
Is connected to the L-side crankcase 13 a of the crankcase 13. In addition, an inlet 16 and an outlet 17 for cooling air are installed in the case cover 14b.

In the swing case 14, a crankshaft 18 and a drive shaft 19 are protruded. A drive V pulley 20 is mounted on the crankshaft 18, a tube shaft 30 is loosely fitted on the drive shaft 19, and a driven V pulley 21 is mounted on the tube shaft 30. A V-belt 22 is suspended between the drive V-pulley 20 and the driven V-pulley 21, and an automatic V-belt transmission is equipped as a primary transmission system. Reference numeral 23 denotes a centrifugal shoe type starting clutch interposed between the tube shaft 30 and the drive shaft 19.

The other end of the drive shaft 19 protrudes into an independent transmission chamber 24, and a gear transmission mechanism 25 is provided between the drive shaft 19 and the rear axle 15 as a secondary transmission system.
Therefore, the power generated in the cylinder 12 is transmitted from the crankshaft 18 to the drive shaft 19 via the V-belt automatic transmission and the starting clutch 23, and is transmitted from the rear axle 15 to the rear wheel 2 via the gear transmission mechanism 25. You.

The drive V pulley 20 is fitted to a drive boss 26 mounted on the crankshaft 18 and is capable of swinging in the axial direction of the crankshaft 18.
7 and a drive fixing face 20b fixed to the crankshaft 18 by the drive shaft.

On the back of the drive movable face 20a,
A centrifugal roller 29 is held between the rear cushion plate 28 fixed to the crankshaft 18. When the rotation speed of the crankshaft 18 increases, the centrifugal roller 29
Centrifugal force acting on the drive movable face 20a is pressed by the centrifugal roller 29, the effective diameter of the V-belt 22 suspended between the drive movable face 20a and the drive fixed face 20b is enlarged, and a high speed range is achieved. Shift up.

On the other hand, the driven V pulley 21 has a driven movable face 21a fitted to the tube shaft 30 so as to be slidable in the axial direction of the drive shaft 19, and a driven fixed face 21b fixed to the tube shaft 30. It is composed.
A face spring 31 is provided on the back surface of the driven movable face 21a, and the face spring 31 is provided with the driven movable face 21a and the driven fixed face 2a.
The effective diameter of the V-belt 22 suspended between 1b is enlarged, and the V-belt 22 is urged to return to the low speed range.

On the other hand, a starter clutch case 32 is fixed to the R-side crankcase 13b shown in FIGS. 3 and 1 at a position opposite to the swing case 14, and a starter clutch mechanism 33 ( A starter clutch chamber 34 for accommodating the same (described later) is formed.
The crankshaft 18 extends outwardly through the starter clutch case 32, and a flywheel magnet rotor 35 is fixed to a tip end thereof by a magnet nut 36. A magnet stator 37 is provided inside the flywheel magnet rotor 35, and the stator 37 is fixed to the starter clutch case 32 by bolts. The flywheel magnet rotor 35 and the magnet stator 37 constitute a flywheel magnet.

A cooling fan 38 is fixed to the back of the flywheel magnet rotor 35. Further, a fan case 40 is bolted between the starter clutch case 32 and a cylinder cover 39 covering the cylinder 12, and a fan cowling 41 is attached to the outside of the fan case 40. An air inlet 42 is formed in the fan case 40, and cooling air is introduced from the air inlet 42 by rotation of the cooling fan 38 to cool the cylinder 12 and the like.

The starter clutch mechanism 33 transmits a driving force of a starter drive gear 44 formed on an output shaft of a starter motor 43 shown in FIG. 1 to a starter driven gear 46 via an idle gear 45, and outputs a one-way clutch 47 This is transmitted to the crankshaft 18 via the clutch bracket 48 to start the engine. The clutch bracket 48 is connected to the crankshaft 18.
Are spline-connected.

A one-way clutch 47 is rotatably disposed on the crankshaft 18 and is integrally rotatably connected to the starter driven gear 46, and a clutch outer race 50 which is bolted to the clutch bracket 48. And a clutch roller 51 which is disposed in a wedge-shaped space between the clutch inner race 49 and the clutch outer race 50 and is urged to be locked to the clutch inner race 49 and the clutch outer race 50. Is done.

In the one-way clutch 47, when the engine is started, the clutch roller 51 is locked to the clutch inner race 49 and the clutch outer race 50, and the rotation of the starter driven gear 46 is
8, the clutch outer race 50 rotates at a higher speed than the clutch inner race 49 after the engine is started.
9 and the clutch outer race 50, the clutch races 49 and 50 are disconnected from each other,
Excessive rotation of the starter motor 43 is prevented.

The starter clutch chamber 34 containing the starter clutch mechanism 33 has a crankshaft 1
8, a V-belt chamber 53 for accommodating a V-belt automatic transmission, a magnet chamber 54 for accommodating a flywheel magnet, and a transmission chamber 24. Furthermore, the starter clutch room 3
Reference numeral 4 denotes a liquid-tight chamber in which the crank chamber 52, the V-belt chamber 53, and the magnet chamber 54 are in a semi-dry or dry state, while the transmission chamber 24 and the transmission chamber 24 are in a wet lubrication state in which lubricating oil is stored.

That is, the starter clutch chamber 34 is
As shown in FIG. 7, a starter clutch main chamber 55 serving as a liquid-tight main chamber for housing the starter clutch mechanism 33 and storing lubricating oil, and a breather chamber 56 formed above the starter clutch main chamber 55 are provided. The R-side crankcase 13b and the starter clutch case 32 are liquid-tightly joined at the mating surface 57 by bolts (not shown). In this case, the R-side crankcase 13b is a member having a large oil storage volume capable of storing a large amount of lubricating oil in the starter clutch main chamber 55, and the starter clutch case 32 is configured to transfer lubricating oil into the starter clutch main chamber 55. A member with a small storage volume and a small storage volume.

The breather chamber 56 communicates with the starter clutch main chamber 55 via a breather communication passage 58 shown in FIGS. 1, 3 and 5, and a space in the fan case 40 via a breather discharge passage (not shown). And eliminates pressure fluctuations and the like in the starter clutch main chamber 55. The breather chamber 56 is provided with the starter clutch case 3
2, as shown in FIG. 6 and FIG.
9 is formed outside the starter clutch case 32. The breather communication passage 58 and the breather discharge passage are formed in the R-side crankcase 13b. Among them, the breather communication passage 58 is shown in FIGS.
As shown in FIG. 5, a deep groove is formed on the boundary wall between the starter clutch main chamber 55 and the breather chamber 56 with reference to the mating surface 57.

Incidentally, in the magnet stator 37 of the flywheel magnet, the side from which the lead wire 60 of the substantially lower half portion 37A shown by the dashed line in FIG. 5 takes out the lead wire 60 is larger than the substantially upper half portion 37B shown by the solid line in FIG. As shown, it is formed to protrude toward the engine center. A substantially upper half portion 37B of the magnet stator 37 is formed so as to be recessed toward the center of the engine.

As shown in FIGS. 1, 6, 7 and 8, the starter clutch case 32 has a substantially lower half portion 32A projecting toward the center of the engine in correspondence with the substantially lower half portion 37A of the magnet stator 37. The upper half portion 32B is formed to protrude outward from the engine corresponding to the substantially upper half portion 37B of the magnet stator 37. As described above, since the substantially upper half portion 32B of the starter clutch case 32 is formed so as to protrude outward from the engine, the oil storage volume of the starter clutch case 32 can be increased accordingly.

The clutch inner race 49 of the one-way clutch 47 is rotatably disposed around the crankshaft 18 via a bearing 61. A substantially upper half portion 32B of the starter clutch case 32 is located near the bearing 61. Is formed to project toward the bearing 61 in a semicircular shape. The protruding arc portion 62 is used for the one-way clutch 4
7 is efficiently collected by the starter driven gear 46 as shown by the dashed line arrow in FIG.

According to the above embodiment, since the substantially upper half portion 32B of the starter clutch case 32 is formed so as to protrude outward from the engine in accordance with the shape of the substantially upper half portion 37B of the magnet stator 37, the motorcycle is provided. Falls to the starter clutch case 32 side and the lubricating oil in the starter clutch main chamber 55 moves to the starter clutch case 32, this lubricating oil is
2 is stored in a large amount in the substantially upper half portion 32B. As a result,
The liquid level 63 of the lubricating oil at the time of the above-described overturn is at a level below the breather communication passage 58 as shown in FIG. 1, and is prevented from being blown into the engine 4 through the breather chamber 56.

As described above, since the lubricating oil in the starter clutch main chamber 55 can be prevented from being blown out when the vehicle falls, the lubricating oil in the starter clutch main chamber 55 can be secured in a sufficient amount. Can be properly lubricated.

The substantially upper half 32B of the starter clutch case 32 is substantially the same as the upper half 37 of the magnet stator 37.
Since B is formed so as to be recessed toward the center of the engine and is formed so as to protrude toward the outside of the engine, the oil storage volume of the starter clutch case 32 can be increased by effectively utilizing the space. As a result, it is not necessary to protrude the entire starter clutch case 32 in the outward direction of the engine to increase the oil storage volume when the vehicle falls, so that the engine can be prevented from being enlarged.

A protruding arc portion 62 is formed on the inner wall surface of the substantially upper half portion 32B of the starter clutch case 32. The protruding arc portion 62 directs the splash oil in the starter clutch main chamber 55 to the vicinity of the bearing 61 of the one-way clutch 47. As a result, the lubricity of the bearing 61 is improved, and the durability of the one-way clutch 47 can be increased.

Further, in the above embodiment, the substantially upper half portion 32B of the starter clutch case 32 protrudes outward of the engine and the projecting arc portion 62 is formed on the inner wall surface of the substantially upper half portion 32B. The manufacturing process of the clutch case 32 is simple, and the maintainability and assemblability of the engine are also good.

[0039]

As described above, according to the breather apparatus for an engine according to the present invention, the engine has a liquid-tight main chamber for storing lubricating oil and a breather chamber for eliminating pressure fluctuations and the like in the liquid-tight main chamber. The liquid-tight chamber is provided, and the liquid-tight chamber is configured by joining a member having a large oil storage volume and a member having a small oil storage volume at a mating surface, and comprises a breather chamber and the liquid-tight main chamber. A communicating breather passage is formed in the member having a large oil storage volume on the basis of the mating surface, and a magnet stator having an irregular shape in the center / outside direction of the engine is disposed adjacent to the member having a small oil storage volume. Since the member having a small oil storage volume is formed in an uneven shape corresponding to the uneven shape of the magnet stator, a member such as a starter clutch chamber is provided. While maintaining the lubricating oil amount in the backroom sufficiently, it is possible to prevent the above-mentioned oil blown through the breather chamber when the vehicle overturn.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view taken along the line II of FIG. 5, showing an embodiment of an engine breather device according to the present invention.

FIG. 2 is an overall side view of a starter type motorcycle equipped with a power unit type engine to which the engine breather device of FIG. 1 is applied.

FIG. 3 is a right half view taken along a line MM in a horizontal sectional view of the power unit type engine of FIG. 2;

FIG. 4 is a left half view taken along a line MM in a horizontal sectional view of the power unit type engine of FIG. 2;

FIG. 5 is a sectional view taken along the line VV in FIG. 3;

FIG. 6 is a front view showing the starter clutch case shown in FIGS. 1 and 3;

FIG. 7 is a rear view of the starter clutch case shown in FIG. 6;

FIG. 8 is a sectional view taken along the line VIII-VIII in FIG. 6;

[Explanation of symbols]

 4 Engine 13b R side crankcase 32 Starter clutch case 32A Starter clutch case approximately lower half 32B Starter clutch case approximately upper half 33 Starter clutch mechanism 34 Starter clutch chamber 37 Magnet stator 37A Magnet stator approximately lower half 37B Magnet stator approximately upper Half 55 Starter clutch main chamber 56 Breather chamber 57 Mating surface 58 Breather communication passage 60 Lead wire 63 Lubricant oil level

Claims (1)

(57) [Claims] An engine is provided with a liquid-tight chamber having a liquid-tight main chamber for storing lubricating oil and a breather chamber for eliminating pressure fluctuations and the like in the liquid-tight main chamber. A member having a large oil storage volume is joined to a member having a small oil storage volume at a mating surface, and a breather communication passage communicating the breather chamber and the liquid-tight main chamber is provided at the mating surface with the member having a large oil storage volume. A magnet stator having a shape that is formed on the basis and is uneven in the center / outside direction of the engine is disposed adjacent to the member having a small oil storage volume, and the member having a small oil storage volume is provided with the uneven shape of the magnet stator. A breather device for an engine, wherein the breather device is configured to have an uneven shape corresponding to the shape of the engine.