JPH074220A - Lubricating device for engine - Google Patents

Abstract

PURPOSE:To shorten guide means and simplify machining by pressing a bearing into the crank journal of a crankshaft, and disposing means for guiding oil toward the crankpin, in the journal from the face in contact with the bearing. CONSTITUTION:In an engine 31, a bearing 57R is pressed into the crank journal 43R of a crankshaft 41R, and means 62, 64, 66 for guiding oil toward a crankpin 45 are disposed in the crank journal 43R from the face in contact with the bearing 57R of the crank journal 43R. On the other hand, a sealing device 75 is mounted on the side part of the bearing 57R. An oil plate 76 forming the sealing device 75 is formed by pressing sheet steel, and each means 79b for leading in oil is disposed inside. Oil is supplied to the means 79b from the outside. The sealing device 75 is used also as the positioning means of the bearing 57R.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine lubricating device, and more particularly to an engine lubricating device for lubricating a crankshaft system.

[0002]

2. Description of the Related Art A crankshaft provided in an engine converts an explosive force due to combustion applied to a piston from reciprocating motion to rotary motion. The reciprocating motion of the piston is transmitted to the crankshaft by a connecting rod (connecting rod).

For example, as shown in FIG. 8, a crankshaft 2 mounted in a 4-cycle single-cylinder engine 1 equipped with a V-belt type automatic transmission has a crank arm 3 and a crank arm 3.
The balance weight 5 is provided at one end of the crank arm 3, and the crank pin 6 is provided at the other end of the crank arm 3.

A large end portion 9 of a connecting rod 8 is connected to the crank pin 6 via a metal bearing 7. A piston 12 is connected to the small end 10 of the connecting rod 8 via a piston pin 11.

On the other hand, on the left side of the crank arm 3 of the crankshaft 2 in FIG.
3 is provided via a needle bearing 14.

The crankshaft 2 is pivotally supported by ball bearings 15R and 15L which are press-fitted into the crankshaft 2 from the left and right and assembled. The right side ball bearing 15R is positioned by a collar 17 formed integrally with the partition wall 16 of the crankcase.

The crank pin 6 and the connecting rod large end portion 9
The sliding contact surface with and is subject to a large load in addition to high-speed rotation, and thus must be constantly lubricated. Therefore, in general, oil passages 18a ... 18e are formed in the crankshaft 2 and the crankpin 6, and the oil supplied from the outside is introduced from the oil passages 18a ... 18e to the sliding contact surface. There is. Similarly, an oil passage 18f is also formed on the sliding contact surface between the crankshaft 2 and the starter clutch 13 to guide the oil.

Oil supplied from the outside is provided on the left side of the left side ball bearing 15L with two oil seals 1
18f in the crankshaft 2 via the oil guide passage 20 formed by 9a and 19b.
Have been led to.

An oil seal 19c is provided on the right side of the crank arm 3 of the crankshaft 2, and two oil seals 19a forming the oil guide path 20 are provided.
A space (crank chamber) 21 in which the crank arm 3 of the crankshaft 2 is located is kept liquid-tight together with 19b.

By the way, the right side ball bearing 15
A cam chain drive sprocket 22 that is a cam chain mechanism that drives a cam shaft that is a valve mechanism is provided on the crankshaft 2 on the right side of R,
It is connected to the cam shaft by a cam chain 23.

On the other hand, at the left end of the crankshaft 2,
A drive pulley 25 that constitutes a part of the V-belt type automatic transmission 24 is provided.

[0012]

However, in the case of forming the oil passages 18a in the crankshaft 2 as in the conventional case, a large number of passages are required or the length of the passages becomes long, which makes the machining complicated. It is easy to become a factor of cost increase.

Further, if the edge of the oil passage 18a comes into contact with the inner race 26 of the left ball bearing 15L when the crankshaft 2 is assembled, scoring may occur. Therefore, the edge of the oil passage 18a is chamfered. Need to be done, which is troublesome.

Further, if the oil passage 18f is formed in the sliding contact surface between the crankshaft 2 and the needle bearing 14 to guide the oil, the surface pressure between the crankshaft 2 and the needle bearing 14 increases, which is not preferable.

Since the crankcase is usually formed by casting such as die casting, when the flange 17 for positioning the right side ball bearing 15R is formed integrally with the partition wall 16 of the crankcase, the flange 17 is a mold. It complicates the production process and die cutting process, leading to higher costs.

On the other hand, an oil guide path 20 is provided on the left side of the left ball bearing 15L with two oil seals 19a, 19a.
When formed by b, the drive pulley 25 projects to the left by the width of the oil guide path 20, and as a result, the overall width of the engine 1 increases, while the drive belt 25 projects to the left, and the V belt 27 forms the left ball bearing. 15
Moving away from L, vibration is disadvantageous.

Since the load on the left side ball bearing 15L increases due to the drive pulley 25 projecting to the left side, it is necessary to increase the size of the left side ball bearing 15L in order to increase the load capacity of the left side ball bearing 15L. As a result, the engine 1 also becomes large.

Furthermore, the conventional oil seal 19a ...
The layout of 19c is based on which oil seal 19a ...
If the oil 19c is not reliably sealed with oil, the engine structure cannot be established, and there is a risk of inconvenience. For example, two oil seals 1 forming the oil guide passage 20.
In the case of 9a and 19b, the diameter of the oil passages 18a formed in the crankshaft 2 is increased or the oil passage 1
Since it is difficult to increase the number of 8a ... In view of the strength of the crankshaft 2, the diameter of the oil passages 18a becomes small, and the oil seals 19a, 19b must reliably seal the oil and send it into the oil passages 18a. If so, the amount of oil in the crankshaft 2 will be insufficient.

Further, when the outside air temperature is low and the viscosity of oil is high, the oil pressure in the oil guide passage 20 immediately after the engine 1 is started is high, so that it is not possible to prevent the oil from leaking from the oil seals 19a, 19b, and the above-mentioned is taken. Oil seal 19
In the arrangement of a and 19b, the leaked oil causes the drive pulley 2
The V-belt 27 may slip, which is not preferable.

Conventionally, the cam chain drive sprocket 22 and the cam chain 23 have not been sufficiently lubricated, and only the performance of the cam chain 23 is improved to improve the self-lubricating property. 23
Cam chain drive sprocket 2
Since the surface pressure with No. 2 becomes high, it is necessary to consider lubrication of the meshing portion more than ever before.

The present invention has been made in consideration of the above circumstances, and it is a first object of the present invention to provide an engine lubrication device in which means for guiding oil which is short in length and easy to process is formed in the crankshaft. For the purpose of one.

A second object of the present invention is to provide an engine lubrication device which prevents galling of bearings when a crankshaft is assembled.

A third object of the present invention is to provide a lubricating device for an engine capable of lubricating the sliding contact surface between the crankshaft and the needle bearing without increasing the surface pressure.

A fourth object of the present invention is to provide an engine lubrication device which can miniaturize the engine.

A fifth object of the present invention is to provide an engine lubrication device in which the bearings can be easily positioned.

A sixth object of the present invention is to provide an engine lubrication device capable of sufficiently lubricating the cam chain mechanism.

[0027]

In order to solve the above-mentioned problems, a lubricating system for an engine according to the present invention has the following features.
As described above, in an engine lubrication system in which oil is pumped into the engine by an oil pump, a bearing is press-fitted into the crank journal of the crankshaft, and the crank journal is inserted into the crank journal from the surface of the crank journal in contact with the bearing. The means for guiding the oil toward the pin is provided.

In order to solve the above-mentioned problems, as described in claim 2, the means for guiding the oil has an opening edge portion facing the bearing, which is provided apart from the outer surface of the bearing. It is a thing.

Further, in order to solve the above-mentioned problems,
As described in claim 3, the crankshaft has a starter clutch disposed on the side of the crankpin, and means for guiding the oil communicating with the means for guiding the oil is provided in the crankpin. A means for distributing oil from the other end of the means for guiding the oil to the large end portion of the connecting rod and the starter clutch is provided.

Further, in order to solve the above-mentioned problems, as described in claim 4, a seal device is attached to the side of the bearing, and an oil plate constituting the seal device is formed by pressing a steel plate. While molding and forming a means for introducing oil into the inside, the oil is supplied from the outside to the oil introducing means.

Then, in order to solve the above-mentioned problems,
According to a fifth aspect of the present invention, the sealing device serves as a positioning means for the bearing.

Further, in order to solve the above-mentioned problems, as described in claim 6, a cam chain mechanism for driving a valve operating mechanism is provided on the crankshaft adjacent to the sealing device, and The cam chain mechanism is lubricated by the oil leaked from the sealing device.

[0033]

According to the present invention having the above-mentioned structure, in the engine lubrication system in which the oil is pumped into the engine by the oil pump, the bearing is press-fitted into the crank journal of the crankshaft and is in contact with the bearing of the crank journal. Since the means for guiding the oil from the surface to the crank pin is provided in the crank journal, the means for guiding the oil that is short and easy to process can be formed in the crankshaft.

Further, since the means for guiding the oil is provided with the opening edge portion facing the bearing away from the outer surface of the bearing, it is possible to prevent galling of the bearing when the crankshaft is assembled. .

Further, in the crankshaft, a starter clutch is arranged on the side of the crankpin, and means for guiding the oil communicating with the means for guiding the oil is provided in the crankpin, while a means for guiding the oil is provided. Since the means for distributing the oil from the other end to the large end of the connecting rod and the starter clutch is provided, the sliding contact surface between the crankshaft and the needle bearing can be lubricated without increasing the surface pressure.

Further, a seal device is mounted on the side of the bearing, and an oil plate constituting the seal device forms a means for introducing oil into the inside by press-molding a steel plate, while the oil plate is formed. Since the oil is supplied to the introducing means from the outside, the size of the engine can be reduced.

Since the sealing device is used as the bearing positioning means, the bearing can be easily positioned.

Further, a cam chain mechanism for driving the valve operating mechanism is provided adjacent to the seal device on the crankshaft, and the oil leaked from the seal device lubricates the cam chain mechanism. Can be lubricated sufficiently.

[0039]

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

FIG. 1 is a horizontal sectional view showing an example of a 4-cycle single cylinder engine unit for a motorcycle equipped with a V-belt type automatic transmission to which the present invention is applied. And
FIG. 2 is an enlarged view of a main part of the engine unit.

In FIGS. 1 and 2, an engine 31 is mounted on the front part of the engine unit 30. The engine 31 mainly includes a crankcase 32 and a cylinder 33.
And a cylinder head 34. Inside the crankcase 32, a belt chamber 36, a crank chamber 37, and a cam chain chamber 3 are formed by partition walls 35a, 35b, 35c.
8 and a magneto chamber 39.

An oil supply passage 40 is formed in the partition wall 35b. The upper end of the oil supply passage 40 communicates with a stud bolt hole (not shown) in the cylinder 33. The oil supplied into the cylinder head 34 is introduced into the stud bolt hole from an oil pump (not shown). An opening 40a is formed at the lower end of the oil supply passage 40 so as to face the cam chain chamber 38.

A crankshaft 41 is arranged in the crankcase 32 at right angles to the traveling direction of the vehicle. The crankshaft 41 is divided into, for example, left and right parts, and is referred to as a right crankshaft 41R and a left crankshaft 41L for convenience. Each of the crankshafts 41R and 41L includes a crank arm 42R and 42L and a crank journal 43R and 42L.
And L.

The crank arms 42R and 42L form balance weights 44R and 44L at one end thereof,
A fitting port 4 for fitting a crank pin 45 described later to the other end.
6R and 46L are formed.

Each crankshaft 41R, 41
The Ls are connected and integrated by the crank pin 45.
A large end portion 49 of a connecting rod 48 is connected to the crank pin 45 via a metal bearing 47. Also,
The small end 50 of the connecting rod 48 has a piston pin 51.
The piston 52 is connected via. This piston 52
Reciprocates in the cylinder 33 of the engine 31, and this reciprocating stroke is transmitted to the crankshaft 41 via the connecting rod 48 to cause rotational movement.

A starter clutch 53 is provided on the left crank journal 43L via a needle bearing 54. The starter clutch 53 is provided with a driven gear 55, and the driven gear 55 is connected to a drive gear of a starter motor (not shown) via an idle gear 56. The starter clutch 53 has a function of transmitting the power of the starter motor to the crankshaft 41 when the engine 31 is started,
After starting, it is automatically disconnected.

In FIG. 2, the right crank journal 43R on the right side of the right crank arm 42R and the left crank journal 4 on the left side of the starter clutch 53 are also shown.
Ball bearings 57R and 57L are press-fitted into 3L, respectively. These ball bearings 57R, 57L
The balls 58 are outer races 59 from the top and bottom respectively.
The ball 58 is sandwiched between the inner race 60 and the inner race 60, while the retainer 61 sandwiches the left and right sides of the ball 58.

The outer race 59 is fixed to the partition walls 35a, 35b of the crankcase 32, while the inner race 60 has the crank journals 43R, 43.
The crankshaft 41 is rotatably supported by L being press-fitted and fixed.

FIG. 3 is a sectional view taken along the line II of FIG. 2, and FIG. 4 is a sectional view taken along the line II-II of FIG.

2, 3 and 4, an oil passage 62, which is a means for guiding oil, is bored in the center of the right crank journal 43R of the crankshaft 41 which contacts the inner race 60 of the right ball bearing 57R. The opening is closed by the cap 62a.
In the center of the left crank journal 43L,
A balance hole 63 equivalent to the oil passage 62 is formed to balance the weight. The right crank journal 4 corresponding to the outer surface of the inner race 60 of the right ball bearing 57R from the right end side of the oil passage 62.
A plurality of, for example, three oil introduction paths 64, which are means for guiding other oil toward the 3R surface, are provided at equal intervals. As shown in detail in FIG. 5, the edges of the right side ball bearing 57R side opening 64a of these oil introducing passages 64 are provided away from the outer surface of the inner race 60 of the right side ball bearing 57R. A space 65 is formed between the outer surface and the outer surface.

Further, an oil guide passage 66 is provided which is a means for guiding another oil from the vicinity of the central portion of the oil passage 62 toward the outer peripheral surface of the right crank journal 43R corresponding to the outer peripheral surface of the crank pin 45. . On the other hand, an oil intake 67, which is a means for guiding oil, is formed at a portion of the outer peripheral surface of the crank pin 45 corresponding to the opening 66a of the oil guide path 66. An oil guide path 68, which is a means for guiding another oil toward the side, is provided.

An oil distribution passage 69a, which is means for distributing oil from the vicinity of the tip of the oil guide passage 68 toward the outer peripheral surface of the crankpin 45, is bored. Further, the oil distribution path 69b, which is means for distributing other oil from the vicinity of the tip end portion of the oil guide path 68, has the crank pin 45.
And the starter clutch 53.

The right side of the right side ball bearing 57R,
That is, the cam chain drive sprocket 70, which is a cam chain mechanism, is provided on the crankshaft 41 in the cam chain chamber 38. On the other hand, a valve mechanism 71 is provided in the cylinder head 34. A cam sprocket 73 is provided at one end of a cam shaft 72 forming a part of the valve mechanism 71, and the cam sprocket 73 and the cam chain drive sprocket 70 are connected by a cam chain 74 which is a cam chain mechanism.
The rotation of the crankshaft 41 causes the cam chain 7 to rotate.
By being transmitted to the camshaft 72 via 4,
The valve operating mechanism 71 is operated.

A seal device 75 is provided on the right side of the right side ball bearing 57R. 6A is a plan view of the sealing device 75, and FIG. 6B is a plan view of FIG.
FIG. 3 is a sectional view taken along line III-III of FIG. 7 is a view taken along the line IV-IV in FIG.

This sealing device 75 is shown in FIG.
As shown in (b) and FIG. 7, it is composed of an oil plate 76 and an oil seal 77. Oil plate 7
6 is, for example, a steel plate that is press-molded into a shape that covers the right side ball bearing 57R. The outer peripheral surface of the oil plate 76 is provided with a plurality of mounting flanges 78, while the surface of the oil plate 76 is formed. Are molded with convex portions 79a and 79b which are means for introducing oil.

As shown in detail in FIG. 5, the insides of these convex portions 79a and 79b are the right side ball bearings 57
While forming spaces 80a and 80b with R, they are molded and arranged so as not to contact the cam chain 74, as shown in FIG. The convex portion 79a is arranged so as to cover the opening 40a of the oil supply passage 40.

A shaft hole 81 is formed near the center of the oil plate 76. The oil seal 77 is fitted on the inner peripheral surface of the shaft hole 81, while the lip portion 77a of the oil seal 77 abuts on the edge portion 43a of the right crank journal 43R of the crankshaft 41, so that the oil introduction passage 64 is provided. Right side ball bearing 57
A space 65 formed between the R side opening 64a and the outer surface of the inner race 60 of the right ball bearing 57R,
Space 8 formed between the convex portions 79a, 79b formed on the oil plate 76 and the right side ball bearing 57R
0a and 80b are kept liquid-tight.

In the sealing device 75, the flange 78 is fixed to the partition wall 35b by a fixing means such as a screw 82.

By the way, as shown in FIG. 1, on the left end side of the crankshaft 41, that is, in the belt chamber 36, the drive pulley 84 of the V-belt type automatic transmission 83 is provided.
Is attached to the driven pulley 86 of the V-belt type automatic transmission 83 via the V-belt 85.
The torque of 1 is transmitted.

The driven pulley 86 is rotatably supported by a driven shaft provided at the rear portion of the engine unit 30, and the rotational force of the engine 31 transmitted to the driven pulley 86 is mediated by a centrifugal clutch mechanism 88. Is transmitted to the driven shaft 87.

The driven shaft 87 is connected to the rear wheel shaft 90 through a mission mechanism 89 which is a reduction gear mechanism and a power transmission device, and the rotation of the engine 31 is transmitted to the rear wheel 91 through the mission mechanism 89. It has become.

On the other hand, on the right end side of the crankshaft 41, that is, in the magneto chamber 39, an alternator 92 forming a part of a charging device and a cooling fan 93 forming a part of an engine cooling system are provided.

The alternator 92 is composed of a flywheel magnet 92a and a stator 92b.
This alternator 92 generates electric power by rotating a stator 92b connected to the crankshaft 41, and transmits power to each part of the vehicle body.

The cylinder 33 of the engine 31 and the cooling fan 93 are covered by a cowling 94. The engine 31 rotates the cooling fan 93 connected to the crankshaft 41 to introduce outside air into the cowling 94 and cools around the cylinder 33.

Incidentally, the belt chamber 36 and the crank chamber 37
Oil seals 95a and 95b are provided on a partition wall 35a for partitioning and a partition wall 35c for partitioning the cam chain chamber 38 and the magneto chamber 39, respectively. The oil seals 95a and 95b are installed so that the open side of the U-shape faces the side to which the hydraulic pressure is applied.

Next, the operation of this embodiment will be described.

When the engine 31 is started, the engine 3
The oil pump (not shown) is driven by the rotating force of 1,
Oil is pumped to each part of the engine 31. Part of the oil is guided from the oil supply passage 40 through the opening 40a to the convex portions 79a and 79b which are means for introducing the oil formed inside the oil plate 76 of the sealing device 75.

Spaces 80a and 80b are formed between the insides of the projections 79a and 79b and the right side ball bearing 57R, while the openings 64a of the oil introduction passage 64 formed in the right side crank journal 43R and the right side. A space 65 is also formed between the outer surface of the inner race 60 of the ball bearing 57R. These spaces 65 and 80 are integrated to form an oil sump 96, and the oil is introduced into the oil sump 96.

The oil in the oil sump 96 guides the oil once formed in the center of the right crank journal 43R from the opening 64a of the oil introducing passage 64 which is a means for guiding the oil formed in the right crank journal 43R. It is guided to the oil passage 62, which is a means, and is guided from the oil guide path 66, which is a means for guiding oil, toward the outer peripheral surface of the right crank journal 43R.

According to the present invention, the right crank journal 4
The 3R oil introduction passage 64, the oil passage 62, and the oil guide passage 66 are not long and are easy to machine as in the conventional case.
Cost can be reduced.

Further, since the edge portion of the opening 64a on the right side ball bearing 57R side of the oil introducing passage 64 is provided away from the outer surface of the inner race 60 of the right side ball bearing 57R, the right side ball bearing 57R is connected to the right crank journal. Scratching does not occur even when it is press-fitted into 43R, and it is not necessary to chamfer the edge of the opening 64a as in the conventional case, so that the processing cost can be reduced. And
Since no galling occurs during press-fitting, the number of defective products is reduced and the cost is reduced.

On the other hand, oil is then fed to the crank pin 45.
Oil intake 6 which is a means for guiding the oil formed inside
The oil is guided toward the center of the crank pin 45 through an oil guide path 68 which is a means for guiding other oil from 7. The oil passes through the oil distribution passage 69a which is a means for distributing the oil drilled from the vicinity of the tip end of the oil guide passage 68 toward the outer peripheral surface of the crank pin 45, and then the connecting rod large end portion 4 is formed.
While being guided to the metal bearing 47 of No. 9, the oil is a means for distributing the oil bored from the vicinity of the tip of the oil guide path 68 toward the joint surface between the crank pin 45 and the starter clutch 53. Distribution path 69
It is also guided to the starter clutch 53 via b.

Since the opening 69c of the oil distribution path 69b led to the starter clutch 53 is not opened to the contact surface with the needle bearing 54 unlike the conventional case, the surface pressure between the needle bearing 54 and the crankshaft 41 is reduced. It never rises.

On the other hand, in the present invention, the right side ball bearing 5
7, a seal device 75 is provided on the right side of the crankshaft 41 so that oil can be introduced into the crankshaft 41. Therefore, there is no need to form an oil guide path with an oil seal as in the conventional case, and the drive pulley 84 projects to the left There is nothing to do. As a result, the width of the engine 31 becomes smaller. Further, the load on the left side ball bearing 57L is lightened and it is not necessary to increase the size of the left side ball bearing 57L, and the engine 31 can be downsized as a whole.
Further, since the V belt 85 approaches the left ball bearing 57L, vibration is also reduced.

By the way, a part of the oil pumped into the sealing device 75 inevitably leaks from the oil seal 77, but in the present invention, the sealing device 75 is arranged adjacent to the cam chain drive sprocket 70. Therefore, the leaked oil can be positively used to sufficiently lubricate the cam chain drive sprocket 70 and the cam chain 74.

In the above-mentioned embodiments, the present invention is applied to the four-cycle engine for motorcycles.
It can be applied to engines for other purposes, and can also be applied to two-cycle engines.

[0077]

As described above, according to the engine lubrication apparatus of the present invention, in the engine lubrication apparatus in which the oil is pumped into the engine by the oil pump,
Since the bearing is press-fitted into the crank journal of the crankshaft, and the means for guiding the oil toward the crank pin from the surface of the crank journal that contacts the bearing is provided in the crank journal, it is short and easy to machine. Means for guiding different oils can be formed in the crankshaft.

Further, since the means for guiding the oil is provided with the opening edge facing the bearing away from the outer surface of the bearing, it is possible to prevent galling on the bearing when the crankshaft is assembled. .

Further, in the crankshaft, a starter clutch is arranged on the side of the crankpin, and means for guiding the oil communicating with the means for guiding the oil is provided in the crankpin, while a means for guiding the oil is provided. Since the means for distributing the oil from the other end to the large end of the connecting rod and the starter clutch is provided, the sliding contact surface between the crankshaft and the needle bearing can be lubricated without increasing the surface pressure.

Further, a seal device is mounted on the side of the bearing, and an oil plate constituting the seal device forms a means for introducing oil into the inside by press-molding a steel plate, while the oil plate is formed. Since the oil is supplied to the introducing means from the outside, the size of the engine can be reduced.

Since the sealing device is used as the bearing positioning means, the bearing can be easily positioned.

A cam chain mechanism for driving the valve operating mechanism is provided on the crankshaft adjacent to the sealing device, and the oil leaking from the sealing device lubricates the cam chain mechanism. Can be fully lubricated.

[Brief description of drawings]

FIG. 1 is a horizontal cross-sectional view of a 4-cycle single-cylinder engine unit for a motorcycle showing an embodiment of an engine lubrication device according to the present invention.

FIG. 2 is an enlarged view of a main part of the engine unit shown in FIG.

3 is a cross-sectional view taken along the line I-I of FIG.

FIG. 4 is a sectional view taken along line II-II in FIG.

FIG. 5 is an enlarged view of the vicinity of the opening of the oil introduction path.

6A and 6B are a plan view and a cross-sectional view taken along the line III-III of the sealing device.

FIG. 7 is a view taken along the line IV-IV in FIG.

FIG. 8 is a horizontal sectional view of a main part of a conventional engine unit.

[Explanation of symbols]

30 engine unit 31 engine 32 crankcase 35a, 35b, 35c bulkhead 38 cam chain chamber 40 oil supply path 41 crankshaft 42R, 42L crank arm 43R, 43L crank journal 45 crankpin 47 metal bearing 48 connecting rod 49 connecting rod large end 52 piston 53 starter clutch 54 needle bearing 57R, 57L ball bearing 59 outer race 60 inner race 62 oil passage (means for guiding oil) 64 oil introduction passage (means for guiding oil) 66 oil guide passage (means for guiding oil) 67 Oil intake (means for guiding oil) 68 Oil guide path (means for guiding oil) 69a, 69b Oil distribution path (means for distributing oil) 70 Cam chain Drive sprocket (cam chain mechanism) 71 Valve mechanism 74 Cam chain (cam chain mechanism) 75 Seal device 76 Oil plate 77, 95a, 95b Oil seal 79a, 79b Convex part (means for introducing oil) 80a, 80b (convex) Space formed between the ball bearing and the right side ball bearing 83 V-belt type automatic transmission 84 Drive pulley 85 V-belt 92 Alternator 93 Cooling fan 96 Oil sump

Claims (6)

[Claims] 1. In a lubrication device for an engine in which oil is pumped into an engine by an oil pump, a bearing is press-fitted into a crank journal of a crankshaft, and a crankpin is inserted into the crank journal from a surface of the crank journal in contact with the bearing. A lubricating device for an engine, characterized in that it is provided with means for guiding the oil toward the engine. 2. The engine lubrication device according to claim 1, wherein the means for guiding the oil has an opening edge portion facing the bearing, which is provided separately from an outer surface of the bearing. 3. The crankshaft has a starter clutch arranged on the side of the crankpin, and means for guiding the oil communicating with the means for guiding the oil, and means for guiding the oil. The engine lubrication device according to claim 1, further comprising means for distributing oil from the other end of the connecting rod to the large end of the connecting rod and the starter clutch. 4. A seal device is mounted on the side of the bearing, and an oil plate forming the seal device forms a means for introducing oil into the inside by press-molding a steel plate, while the oil introduction The engine lubrication device according to claim 1 or 2, wherein the means is externally supplied with oil. 5. The engine lubrication device according to claim 4, wherein the seal device serves as a positioning means for the bearing. 6. A cam chain mechanism for driving a valve operating mechanism is provided adjacent to the seal device on the crankshaft, and the cam chain mechanism is lubricated by oil leaking from the seal device. Alternatively, the engine lubricating device according to the item 5.