JPH0747926B2 - Engine crankshaft lubricator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) In the present invention, a clutch shaft having a clutch attached to one end is arranged in parallel with a crank shaft, and a rotating body is fixed to an end of the crank shaft on the clutch side. The present invention relates to a crankshaft oil supply device applied to an engine.

(Background of the Invention) In an engine used in a motorcycle or a small vehicle for running on rough terrain, a crankshaft is usually arranged in a vehicle width direction, and a main shaft that holds a gear group of a transmission behind the crankshaft. And the auxiliary shaft is installed in parallel. A clutch is provided at one end of the main shaft, and the rotation of the crankshaft is transmitted to the clutch via a reduction gear wheel provided on the crankshaft. The crankshaft is usually provided with a generator, but it is desirable to dispose the generator at the end opposite to the clutch in order to avoid interference with the clutch and reduce the size of the engine. An oil passage is formed on the crankshaft to supply lubricating oil to the bearing.When a generator is attached to one end of the crankshaft, this oil passage is opened at the other end close to the clutch and the crankcase It becomes necessary to pump the lubricating oil from the cover. As a result, the engine width increases and the engine becomes larger. It has been a conventional practice to provide a lubricating oil jacket in the middle of the crankshaft and send lubricating oil from here to the oil passage provided in the crankshaft, but in this case as well, the crankshaft becomes longer and the engine width increases. And there is a problem that the engine becomes large. On the other hand, it is conceivable to fix a rotating body, for example, a pulley, a sprocket, a centrifugal clutch, a forced air fan, etc., to the end of the crankshaft on the clutch side. However, in this case, the crankshaft becomes extremely long, and in addition, in order to receive the radial force applied to the rotating body, a bearing for supporting the crankshaft is required near the inside of the rotating body in the vehicle width direction. For this reason, lubricating oil must be supplied also to this bearing, which causes a problem that an increase in the size of the engine, especially an increase in the width of the engine cannot be avoided.

(Object of the Invention) The present invention has been made in view of the above circumstances, and when the rotating body is fixed to the clutch side end of the crankshaft,
It is an object of the present invention to provide an engine crankshaft oil supply device in which the engine size is reduced, particularly, the dimension in the crankshaft direction is made as small as possible.

(Structure of the Invention) According to the present invention, an object of the present invention is to arrange a main shaft and a sub shaft for holding a transmission gear group in parallel behind a crank shaft arranged in a vehicle body width direction and supported by journal bearings. A reduction gear is provided on the vehicle body width center side of the clutch provided at one end of the main shaft,
In an engine that transmits the rotation of a reduction gear provided on the crankshaft to the reduction gear, one end of the crankshaft on the clutch side is outside the vehicle width direction with respect to the clutch and viewed from the longitudinal direction of the crankshaft. A rotating body is fixed so as to overlap with the clutch, and an oil passage is opened in the radial direction between the reduction gear and the bearing that is close to the inner side in the vehicle width direction of the rotating body on the crankshaft. A lubricating oil jacket surrounding the circumference of the crankshaft is provided so as to include the bearing, and at least a part of the lubricating oil jacket is located within the width of the clutch in the vehicle body width direction. This is achieved by a crankshaft oil supply device.

(Embodiment) FIG. 1 is a development view showing an embodiment of the present invention, FIG. 2 is a side view showing a refueling system, and FIG. 3 is a left side view of a four-wheeled vehicle for running on rough terrain equipped with this engine. 4 is a right side view with a part thereof omitted, and FIG. 5 is a partially cutaway plan view.

In FIGS. 3, 4 and 5, reference numeral 10 denotes a pair of left and right steering front wheels, and 12
Is a pair of left and right driving rear wheels, and 14 is a forced air-cooled laterally mounted single-cylinder crankshaft engine.
A steering bar handle 16 is provided above the front wheels 10 and 10, and a fuel tank 18 and a straddle-type operation seat are provided behind the steering bar handle 16.
20 are arranged in sequence. 22 is a front fender integrally formed on the left and right so as to cover the upper sides of both front wheels 10 and 10, 24 is both rear wheels 1
It is a rear fender that is formed in a pair of left and right so as to cover the upper part of 2,12. The rear part of the above-mentioned sitting operation seat 20 extends behind the fender 24.

A cooling air intake 26 is formed on the upper surface on the right side of the front fender 22 so as to be directed forward so as to take in traveling wind. A cooling air discharge port 28 is formed on the left slope of the front fender 22, that is, the slope that covers the rear of the left front wheel 10, and is directed toward the left side of the vehicle body. Reference numerals 30 and 30 are a pair of left and right footrests.

In Figures 1 and 2, the single cylinder engine 14 has a crankcase 3
0, a cylinder 32, and a cylinder head 34 are provided. A press-fitted assembly type crankshaft 36 is horizontally supported by the crankcase 30. In FIG. 1, 30a and 30b are crankshafts 36
Journal bearings that support the crankshaft 36 outside the left and right crank webs.

The piston 38 is connected to the crankshaft 36 by a connecting rod 40. Reference numeral 42 denotes an overhead cam shaft, which is driven by a timing chain 44 which is wound around the crank shaft 36, and which is provided with an intake valve and an exhaust valve (both not shown) attached to the cylinder head 34. Open and close. 46 is a spark plug and 48 is an exhaust pipe.

A magneto generator 50 is attached to the left end of the crankshaft 36. Reference numeral 52 is a known constant mesh transmission, and its main shaft 54 and auxiliary shaft 56 are arranged in parallel with the crankshaft 36. A known wet multi-plate clutch 58 is attached to one end of the main shaft 54, that is, one end opposite to the generator 50. That is, in this embodiment, the main shaft 54 is the clutch shaft.
The reduction gear 60 of the clutch 58 meshes with a reduction gear 62 fixed to the crankshaft 36. A pump drive gear 64 is integrally attached to the reduction gear 60. The rotation of the counter shaft 56 is transmitted to the rear wheel 12 via the sprocket 66 and the chain 68.

The right end of the crankshaft 36, that is, the end on the clutch 58 side, passes through the vicinity of the outer periphery of the clutch 58 and projects axially outward (to the right in FIG. 4) from the clutch 58. 70 is fixed. This pulley
70 overlaps with the clutch 58 when viewed in the axial direction.

Reference numeral 72 denotes a crankcase cover, which is fixed to the right side surface of the crankcase 30 and covers the clutch 58 and the like. A lubricating oil jacket 74 that surrounds the crankshaft 36 between the reduction gear 62 and the pulley 70 of the crankshaft 36, an oil filter housing 76, and a fan support arm 78 are integrally formed on the crankcase cover 72. Has been done. Most of the jacket 74 is located within the width of the clutch 58. 74a in the figure,
74b is an oil seal, and 74c is a bearing adjacent to the oil seal 74b on the inner side in the engine width direction. An oil filter 80 is stored in the oil filter storage portion 76. The fan support arm 78 extends substantially parallel to the cylinder 32, and a shaft 82 is rotatably held at its tip. A pulley 84 is attached to the outer end of the fan shaft 82, and a V belt 86 is wound around the pulley 84 and the pulley 70. An axial fan is provided at the end of the fan shaft 82 on the cylinder 32 side, that is, the inner end.
88 is installed.

An oil passage 36A is formed in the crankshaft 36. One end of the oil passage 36A opens in the radial direction between the pulley 70 and the reduction gear 62 and communicates with the lubricating oil jacket 74. The other end of the oil passage 36A communicates with the large end of the connecting rod 40.

Reference numeral 90 denotes an engine cover, which is formed so as to surround the cylinder 32 and the cylinder head 34, and has an inflow duct on its right side surface.
92 is connected, and a discharge duct 94 is integrally formed on the left side surface. The duct 92 communicates with the cooling air intake 26,
The duct 94 communicates with the cooling air discharge port 28.

In FIG. 2, 96 is a lubricating oil pump, which is driven via a gear 64 and an idle gear 98 provided on the main shaft 54. Therefore, when the engine 14 is started, the lubricating oil pump 96 sucks in the lubricating oil accumulated in the lower portion of the crankcase 30 and sends it to the lubricating oil filter storage portion 76 under pressure. The lubricating oil passes through the filter 80, and a part of the lubricating oil passes from the lubricating oil jacket 74 through the oil passage 36A in the crankshaft 36 and is pumped to the large end portion of the connecting rod 40 or the like.
The other part of the lubricating oil is
It is sent to the cylinder head 34 through an insertion hole of a long bolt 100 penetrating 32 and 32 to lubricate the valve mechanism such as the cam shaft 42.

The rotation of the crankshaft 36 is transmitted to the fan 88 by the belt 86. Therefore, the outside air flows into the engine cover 90 from the cooling air intake port 26 through the duct 92 and is sent to the cylinder 32 and the cylinder head 34 by the fan 88 to cool them. Then, the cooling air whose temperature has risen is guided to the cooling air discharge port 28 by the duct 94.

Although the pulley 70 is fixed as the rotating body in this embodiment, the rotating body may be a chain sprocket, a centrifugal clutch, a forced air cooling fan, or the like.

(Effects of the Invention) As described above, according to the present invention, one end of the crankshaft is projected to the outside of the clutch, the rotating body is fixed to this protruding end, and the rotating body and the clutch are overlapped when viewed in the axial direction. On the other hand, the lubricating oil is supplied to the oil passage in the crankshaft from the lubricating oil jacket provided between the reduction gear of the crankshaft and the bearing adjacent to the inner side of the rotor in the engine width direction. Here, at least a part of the lubricating oil jacket fits within the width of the clutch in the vehicle body width direction. Therefore, the width of the clutch can be effectively used to effectively use the space between the reduction gear and the rotating body formed near the outer circumference of the clutch. Therefore, the size of the engine in the crankshaft direction can be reduced, and the rotating body overlaps with the clutch as viewed in the axial direction, so that the size of the entire engine can be reduced.

[Brief description of drawings]

FIG. 1 is a development view showing an embodiment of the present invention, FIG. 2 is a side view showing a refueling system, and FIG. 3 is a left side view of a four-wheeled vehicle for running on rough terrain equipped with this engine. Is a right side view with a part thereof omitted, and FIG. 5 is a partially cutaway plan view. 14 …… Engine, 36 …… Crankshaft 36A …… Oil passage, 54 …… Main shaft as clutch shaft, 58 …… Clutch, 62 …… Reduction gear, 70 …… Pulley as rotating body, 74 …… Lubrication Oil jacket.

Claims (1)

[Claims] 1. A vehicle body of a clutch in which a main shaft and a sub shaft for holding a transmission gear group are arranged in parallel behind a crank shaft which is arranged in the width direction of the vehicle and supported by journal bearings, and which is provided at one end of the main shaft. An engine for transmitting a rotation of a small reduction gear provided on the crankshaft to the large reduction gear provided on the center of the width and for transmitting the rotation of the small reduction gear to the large reduction gear. Therefore, the rotating body is fixed so as to overlap with the clutch when viewed from the longitudinal direction of the crankshaft, and an oil passage is provided on the crankshaft between the bearing and the reduction gear, which are close to the inside of the rotating body in the vehicle width direction. A lubricating oil jacket, which is opened in the radial direction and communicates with this oil passage and surrounds the periphery of the crankshaft, is provided so as to include the bearing, and at least a part of this lubricating oil jacket is within the width of the clutch in the vehicle body width direction. Crankshaft oil supply device for an engine is characterized in that the so that.