JP2000213321A - Lubricating structure for saddle type vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain necessary oil pressure by forming a lubricating oil passage in a space-saving manner without enlarging an engine. SOLUTION: In this lubricating structure, an axis core oil passage 31 along the axis cores of a crank shaft 13 and a drive shaft 18 is provided, and is communicated with a crank pin, to lubricate the passage 31 by oil from an oil pump. In this case, the outer periphery of the shaft 18 is equipped with an oil bath 28 annularly provided between an oil seal 26 and a seal type bearing 27, and an oil inlet passage 34 for communicating the passage 31 of the shaft 18 and the bath 28.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubrication structure for a straddle-type vehicle.

[0002]

2. Description of the Related Art Conventionally, lubrication by supplying oil to a crankpin or the like of an engine having a pulley on the same axis as a crankshaft is performed by using oil from an outer end of a drive shaft having the same axis as the crankshaft. Some types are supplied.

There is also a system in which oil is supplied from an axial oil passage provided halfway through the crankshaft and lubricated by supplying oil to the crankpin by centrifugal force.

Further, two oil seals are provided on the outer periphery of the crankshaft, and an oil tank is provided between the two oil seals so as to communicate with an axial oil passage provided halfway through the crankshaft to supply oil to the crankpin. There is a type that lubricates.

There is also a type of lubricating by supplying oil from a flywheel magneto side of a crankshaft to a crankpin via an axial oil passage of the crankshaft.

[0006]

However, in the type in which oil is supplied from the outer end of the drive shaft, the total length of the crankshaft becomes longer by the amount of the oil supply passage at the outer end of the drive shaft. Will increase. Further, since the shaft oil passage must be formed long, the machining operation is difficult, and the pressure loss in the long shaft oil passage is large.

Further, in a system utilizing centrifugal force, a sufficient oil pressure in the shaft center oil passage cannot be secured.

Further, in a type in which an oil tank is provided on the outer periphery of the crankshaft and oil is supplied to the crankpin and lubricated, a space for forming the oil tank is required, and the crankshaft becomes longer by that amount, so that the engine is not used. It will increase. Further, two oil seals are required, the number of parts is increased, and the device configuration is complicated.

Furthermore, in the type in which oil is supplied from the flywheel magneto side of the crankshaft, an oil pump is provided on the opposite side of the flywheel magneto side, but an oil passage must be formed to the flywheel magneto side. The oil passage must be long and the oil pressure loss is large.

The present invention has been made in consideration of the above circumstances, and has a lubricating oil passage formed in a space-saving manner without increasing the size of an engine to maintain a required oil pressure. The purpose is to provide a structure.

Another object of the present invention is to provide a lubricating structure for a saddle-ride type vehicle in which oil pressure loss is reduced.

Still another object of the present invention is to provide a lubricating structure for a saddle-ride type vehicle in which the structure of the apparatus is simplified and the machining operation is facilitated.

[0013]

According to a first aspect of the present invention, an axial oil passage is provided along the axis of a crankshaft and a drive shaft, and the axial oil passage is connected to a crankpin. In a lubricating structure for a straddle-type vehicle in which oil from an oil pump is lubricated by communicating with a first oil seal 26 and a seal type bearing 27 on the outer periphery of the drive shaft 18. Oil tank 28 and the drive shaft 1
8 is provided with an oil inlet passage 34 communicating the shaft oil passage 31 with the oil tank 28.

According to the invention of claim 2, the drive shaft 1
8 between the centrifugal clutch 17 and the second oil seal 35
The second oil seal 35 is provided with a base 35 a provided on the side wall of the drive shaft 18 and the crankshaft 13 at a required angle on the side wall of the centrifugal clutch 17.
And a lip portion 35b that is inclined and contacts in the axial direction.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a left side view of a saddle-ride type vehicle to which an embodiment of a lubrication structure for a saddle-ride type vehicle according to the present invention is applied, and FIG. 2 is a plan view of the saddle-ride type vehicle of the above embodiment.

As shown in FIGS. 1 and 2, the saddle-ride type vehicle 1 is provided with a front wheel 2 and a rear wheel 3 at the front and rear, respectively, a front fender 4 is provided at the front wheel 2, and a rear fender 4 is provided. A rear fender 5 is provided on the wheel. Front wheel 2
Is connected to an operation system 7 such as a handle 6. A fuel tank 8 is provided at the upper center of the vehicle body. An engine 9 is provided below the fuel tank 8, and a seat 10 is provided behind the fuel tank 8.

FIG. 3 is an enlarged schematic sectional view of the engine 9 according to the present embodiment. The engine 9 of this saddle type vehicle
A horizontal type is used. A crankshaft 13 as an output shaft of the engine 9 has one end connected to a recoil starter 14.
As a result, the engine 9 is started. A flywheel magneto 16 is provided on the outer periphery of the crankshaft 13 between the recoil starter 14 and the piston 15.

The other end of the crankshaft 13 is connected to the centrifugal clutch 17, and is connected to the drive shaft 18 when the crankshaft 13 reaches a predetermined rotation or more. The crankshaft 13 and the drive shaft 18 are provided on the same axis.

A drive pulley 20 is connected to the drive shaft 18, and the rotation of the drive pulley 20 is transmitted to a driven pulley 22 by a V-belt 21. A V-belt type continuously variable transmission is constituted by the driving pulley 20, the driven pulley 21 and the V-belt 21, and the gear ratio is automatically changed by changing the radius of the driving pulley 20 and the driven pulley 22 with which the V-belt 21 contacts. It has become.

When the rotation of the drive shaft 18 increases due to an increase in the vehicle speed, the width of the drive pulley 20 is reduced by the centrifugal weight, the belt is pushed out, the belt rotation radius is increased, and the driven pulley 22 The spring pressed in the direction contracts, the pulley width increases, and the radius of rotation decreases, and the change in the radius of rotation changes the speed ratio. The driven shaft 23 is connected to the forward / reverse switching unit 24.

FIG. 4 is an enlarged sectional view of a portion A in FIG.
FIG. 5 illustrates a main part of the present embodiment.
It is the schematic which expands and shows a part.

In the present embodiment, an oil tank 28 is annularly provided on the outer periphery of the drive shaft 18 between the first oil seal 26 provided on the drive shaft 18 side and the seal type bearing 27. Oil from an oil pump (not shown) is stored in an oil tank 28 via an oil pipe 29.

The oil tank 28 is provided in a dead space between the first oil seal 26 provided on the drive shaft 18 side and the seal type bearing 27, so that the oil tank 28 does not increase the engine 9.

An axial oil passage 31 is provided from the axis of the crankshaft 13 to the middle of the axis of the drive shaft 18. The axial oil passage 31 of the crankshaft 13 is
It opens to the outer periphery of the crank pin 33 via the oil jet 32.

The drive shaft 18 includes a drive shaft 18.
An oil inlet passage 34 that communicates the shaft center oil passage 31 with the oil tank 28 is provided. A second oil seal 35 is provided between the centrifugal clutch 17 and the drive shaft 18.

FIG. 6 is an enlarged schematic view showing the vicinity of the second oil seal 35. The second oil seal 35 is
A drive shaft side base 35a and a lip 35b that is inclined from the base 35a to the side surface of the centrifugal clutch at a required angle of inclination in the axial direction of the crankshaft 13 to contact the centrifugal clutch 17 and the drive shaft 18 and an oil seal is performed. Crankshaft 13, drive shaft 18, centrifugal clutch 17
And the portion surrounded by the second oil seal 35 is filled with oil.

In the straddle-type vehicle 1 configured as described above,
When the engine 9 starts, the piston 15 slides to rotate the crankshaft 13 and start an oil pump (not shown).

In the early stage of starting the engine 9, the rotation speed of the crankshaft 13 is low, and the oil pressure from the oil pump is low. When the oil pressure is low,
The sliding portion of the lip 35b of the second oil seal 35 that contacts the side surface of the centrifugal clutch 17 slides with low frictional force, and reduces energy loss due to frictional force.

As the rotational speed of the crankshaft 13 increases, the oil pressure also increases. When the oil pressure increases, the sliding portion of the lip portion 35b of the second oil seal 35 that contacts the side surface of the centrifugal clutch increases the frictional force and prevents leakage of the oil pressure. The high-pressure oil is supplied from an outer peripheral opening of the crank pin 33 through an oil pipe 29, an oil tank 28, an axial oil passage 31, and an oil jet 32 from an oil pump (not shown).

According to the present embodiment, the outer periphery of the drive shaft 18 communicates with the oil tank 28 for storing oil from an oil pump (not shown), and the oil tank 28 that connects the shaft center oil passage 31 and the oil tank 28. Oil inlet passage 3
4, the processing work can be facilitated with a simple configuration,
The shaft oil passage 31 can be shortened, the pressure loss due to oil passage can be reduced, and the lubricating oil passage can be formed in a space-saving manner without increasing the engine 9.

Further, according to the present embodiment, the base 35a provided on the drive shaft 18 side and the side of the centrifugal clutch 17 from the base 35a are inclined in the axial direction of the crankshaft 13 at a required inclination angle. Since the second oil seal 35 having the contacting lip portion 35b is provided, an axial dimensional error between the centrifugal clutch 17 and the drive shaft 18 can be absorbed.

According to the present embodiment, the second oil seal 35 seals the oil between the centrifugal clutch 17 and the drive shaft 18, and the crankshaft 13, the drive shaft 18 and the centrifugal clutch 17 and the portion surrounded by the second oil seal 35 are filled with oil. Therefore, when the oil pressure at the time of starting the engine 9 is low, the centrifugal clutch 17 of the lip 35b of the second oil seal 35 is used. The sliding portion in contact with the side surface can be slid with low frictional force, energy loss due to frictional force can be reduced, and when the oil pressure increases, the centrifugal clutch of the lip portion 35b of the oil seal means 35 The sliding part in contact with the 17 side surface increases the frictional force,
Oil pressure leak can be prevented and the crank pin 3
3 can be effectively supplied with oil and can be actively lubricated by oil supply.

According to the present embodiment, the lubricating oil passage can be formed in a space-saving manner without increasing the size of the engine 9, and the axial dimensional error between the side wall of the centrifugal clutch 17 and the drive shaft 18 can be absorbed. When the oil pressure is low, energy loss due to frictional force can be reduced. When the oil pressure is high, leakage of oil pressure can be prevented, and oil can be supplied to the crankpin 33 effectively. It has an excellent effect that it can be actively lubricated.

[0034]

As described above, according to the lubricating structure for a saddle-ride type vehicle according to the present invention, an axial oil passage is provided along the axis of the crankshaft and the drive shaft. In a lubrication structure for a straddle-type vehicle in which oil from an oil pump is lubricated by communicating with a crank pin, an oil tank provided annularly between an oil seal provided on an outer periphery of a drive shaft and a seal type bearing. And an oil inlet passage that connects the shaft oil passage of the drive shaft and the oil tank. This facilitates machining work with a simple configuration, and facilitates lubrication in a small space without increasing the engine size. The oil passage can be formed, the shaft oil passage can be shortened, and the pressure loss of oil caused by passing through the shaft oil passage can be reduced.

According to the lubricating structure for a saddle-ride type vehicle according to the present invention, oil seal means is provided between the drive shaft and the centrifugal clutch, and the second oil seal is provided on the base provided on the side wall of the drive shaft. And the lip portion which is in contact with the side wall of the centrifugal clutch at a required angle while being inclined in the axial direction of the crankshaft, so that the dimensional error in the axial direction between the side wall of the centrifugal clutch and the drive shaft can be absorbed, When the oil pressure is low, the sliding portion of the lip portion of the second oil seal can be slid with low frictional force, energy loss due to frictional force can be reduced, and when oil pressure is high, The sliding part of the lip of the oil seal means raises frictional force, prevents oil pressure leakage, can effectively supply oil to the crankpin, and actively lubricates Exhibits an excellent effect that can.

[Brief description of the drawings]

FIG. 1 is a left side view of a saddle-ride type vehicle to which an embodiment of a lubrication structure for a saddle-ride type vehicle according to the present invention is applied.

FIG. 2 is a plan view of the straddle-type vehicle according to the embodiment.

FIG. 3 is a schematic sectional view illustrating an engine unit of the embodiment.

FIG. 4 is an enlarged sectional view of a portion A in FIG. 3;

FIG. 5 is a diagram for explaining a main part of the embodiment, and FIG.
FIG.

FIG. 6 is an enlarged view illustrating the vicinity of an oil seal unit of the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Saddle-type vehicle 2 Front wheel 3 Rear wheel 4 Front fender 5 Rear fender 6 Handle 7 Operation system 8 Fuel tank 9 Engine 10 Seat 13 Crankshaft 14 Recoil starter 15 Piston 16 Flywheel magneto 17 Centrifugal clutch 18 Drive shaft 20 Drive pulley 21 V belt 22 driven pulley 23 driven shaft 24 forward / reverse switching unit 26 oil seal 27 seal type bearing 28 oil tank 29 oil pipe 31 axial oil passage 32 oil jet 33 crank pin 34 oil inlet passage 35 oil seal 35a base 35b lip

Claims (2)

[Claims] 1. A straddle-type vehicle in which an axial oil passage is provided along the axis of a crankshaft and a drive shaft, and the axial oil passage is communicated with a crankpin to lubricate oil from an oil pump. In the lubrication structure, an oil tank 28 provided annularly between the first oil seal 26 and the seal type bearing 27 on the outer periphery of the drive shaft 18, an axial oil passage 31 of the drive shaft 18, and the oil tank A lubricating structure for a straddle-type vehicle, comprising: an oil inlet passage communicating with the vehicle. 2. The drive shaft 18 and the centrifugal clutch 1
7, a second oil seal 35 is provided between the crankshaft 13 and the base 35a provided on the side wall of the drive shaft 18 and the side wall of the centrifugal clutch 17 at a required angle. 2. A lubrication structure for a saddle-ride type vehicle according to claim 1, further comprising: a lip portion 35b which is inclined and in contact with the axial direction of the vehicle.