JPH08100618A - Vertical engine - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] In a vertical engine, the oil remaining in the cylinder is favorably returned to the crank chamber side to ensure smooth oil circulation, and the returned oil causes the returned oil to reach the bottom wall of the crank chamber. Prevents entry into the lower flywheel chamber. A cylinder in which a crank chamber 23 is formed by a skirt portion of a cylinder block 18 and a half-split crankcase 19 attached to the skirt portion to form a crank bearing portion 28a ₁ at the lowermost position in the crank chamber. An oil drop hole 81 for communicating the lower surface side of the wall portion with the inside of the adjacent cylinder 24 is formed in the bearing wall portion on the block side obliquely upward from the mating surface side with the half-split crankcase 19. The oil from the oil drain hole 81 is returned to the oil pan 68 through the oil passage extending on the bottom wall of the crank chamber toward the cylinder head 20. An oil drain hole is provided at the crank chamber side end of each cylinder wall portion 79 that defines the upper and lower adjacent cylinders.
An oil hole 80 similar to 81 is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertical engine having a crankshaft oriented vertically.

[0002]

2. Description of the Related Art For example, Japanese Utility Model Laid-Open No. 3-21509 and Japanese Utility Model Laid-Open No. 3-23609 disclose vertical engines (upright type engines) in which a crankshaft is vertically oriented. A flywheel is provided at the lower end of the crankshaft protruding from the engine body.

The flywheel is housed in a flywheel chamber, and oil for engine lubrication is housed in a transmission housing connected to the flywheel chamber and provided below the flywheel chamber. Then, to prevent this oil from entering the flywheel chamber, the inside of the transmission housing and the inside of the engine body are communicated with each other by a feed pipe and a return pipe that are arranged around the outside of the flywheel chamber, and the oil inside the transmission housing is The return oil is sent to the oil pump above the crank chamber through the feed pipe, and the return oil returns from the oil reservoir formed near the lower end of the crank cover into the transmission housing through the return pipe.

As can be seen from the drawings, this engine employs a Siamese type cylinder block in which a plurality of cylinders are arranged in series in the vertical direction and the spaces between the cylinders are narrowed.

[0005]

In such a cylinder block, since the thickness (width) of the crank bearing portion provided on the extension of the wall between the cylinders is larger than the thickness of the wall between the cylinders, the piston sliding causes Oil scraped into the crank chamber tends to remain on the wall surface of the crank bearing portion side.

Therefore, conventionally, a hole is drilled from below the cylinder block to form an oil return hole for communicating the upper and lower cylinders on each wall between the cylinders. In an engine equipped with a flywheel in the engine, there is a flywheel chamber directly below the cylinder block, so it is not possible to form an oil return hole by drilling from below, and therefore there is such an oil return hole. There is no choice but to use a structure that does not, and there was a problem in ensuring a smooth oil circulation.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances. In the present invention, the crankshaft is oriented substantially vertically and the crank chamber bottom wall of the crankshaft is provided. In a vertical engine in which a flywheel is provided at the lower end portion that penetrates through the crank chamber, the crank chamber is provided with a skirt portion that is integrally provided in the cylinder block, and a half-divided portion that is attached with its mating surface aligned with the skirt portion. A bearing wall portion on the cylinder block side that forms a crank bearing portion at a lowermost position in the crank chamber, the lower surface side of the wall portion, and the wall portion inside the lowermost cylinder. An oil drain hole that communicates with the upper surface side of the cylinder having a downward slope from the cylinder side toward the mating surface with the half-split crankcase. To.

The oil drain hole can be formed in the skirt portion of the cylinder block by directing a hole drilling tool obliquely upward from the open mating surface side of the cylinder block without making a hole in the crank chamber bottom wall.

However, since the oil drain hole is formed in the bearing wall portion on the cylinder block side and communicates with the portion of the cylinder where the oil is likely to remain as described above, the oil in the cylinder can be easily discharged through the oil drain hole. The oil is returned to the crank chamber, and the returned oil does not enter the flywheel chamber below the bottom wall of the crank chamber, so that smooth oil circulation is ensured.

When the engine is an in-line multi-cylinder engine in which a plurality of cylinders are vertically arranged in a cylinder block, the crank chamber side ends of the respective cylinder wall portions defining the adjacent upper and lower cylinders are respectively arranged. An oil hole for communicating the upper and lower cylinders is formed obliquely upward from the mating surface side with the half-split crankcase so as to be inclined downward from the inside of the cylinder inner wall to the lower crank chamber.

These oil holes can be easily formed independently in the same manner as described above, and the oil in each cylinder flows downwards through these oil holes in sequence.
The oil is drained from the lowermost oil drop hole between the bearing wall portion and the crank chamber bottom wall.

An oil passage for guiding the oil from the oil drop hole to the cylinder head side is provided on the bottom wall of the crank chamber on the cylinder block side, and the oil is dropped through the oil passage to the lower oil pan on the cylinder head side. By doing so, it is possible to return the return oil from the cylinder in a short return path without sending the return oil from the cylinder to the oil sump on the side opposite to the cylinder of the crank chamber once passing over the flywheel as in the conventional example. The oil flows smoothly and the total amount of oil required is small.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a vertical engine for an outboard motor will be described below.

FIG. 1 is an overall side view of an outboard motor 1 equipped with a vertical engine according to the present invention. Reference numeral 1a denotes an outboard motor main body case including an extension case 2, a gear case 3, and the like. An engine 4 according to the present invention is mounted on an upper portion of the main body 1a, and an engine cover 5 covers the upper portion thereof.

The outboard motor 1 is mounted on the stern 7 via a mounting device 6. The mounting device 6 includes a bracket 8 fixed to the stern 7 via bolts, and a swivel case 10 pivotally attached to the bracket 8 via a tilt shaft 9 horizontally mounted on the front end thereof so as to be vertically swingable. A swivel shaft 11 is pivotally supported in a swivel case 10 so as to be vertically oriented. The outboard motor 1 connects the swivel shaft 11 with upper and lower connecting members.
They are connected via 12, 12a.

The crankshaft 13 of the engine 4 is oriented vertically, and the drive shaft 14 connected to the crankshaft 13 extends downward in the extension case 2 and reaches the gear case 3. The lower end of the drive shaft 14 is connected to the propeller shaft 16 in the gear case 3 via the forward / reverse switching device 15, and the propeller 17 is transmitted via the crankshaft 13, the drive shaft 14, the forward / backward switching device 15 and the propeller shaft 16. It is driven to rotate by engine power.

FIG. 2 is a vertical sectional view of the engine 4, and FIG. 3 is a schematic plan view showing the engine 4 in the engine cover 5 together with its accessories. As described above, the crankshaft 13 is oriented vertically. As shown in FIG. 1, the engine 4 is mounted with the crankshaft 13 positioned forward (outboard side) of the outboard motor 1 and the cylinder head positioned rearward. That is, in FIGS. 2 and 3, the right side corresponds to the front side of the outboard motor 1.

The main body of the engine 4 includes a cylinder block 18 integrally provided with a skirt portion 18a forming a half of the crankcase, a half crankcase 19 forming the remaining half of the crankcase, a cylinder head 20, and a cylinder. It is composed of a head cover 21. The half-split crankcase 19 has its mating surface 18 on the skirt portion 18a.
c, and is integrally connected to the skirt portion 18a by a bolt 22.
Forming 23.

Four cylinders are provided in the cylinder block 18.
Twenty-four are arranged vertically in a line. Ie engine 4
Is an in-line 4-cylinder 4-cycle engine, and each piston 25 is connected via a connecting rod 26 to one crankshaft 13 oriented in the vertical direction. The crankshaft 13 is provided on the cylinder block 18 side and the half-split crankcase 19 side, is fastened by bolts 27, and is opposed to bearing portions 28a,
It is sandwiched between 28b and rotatably supported in the crank chamber 23.

A cam shaft 30 is vertically arranged in a valve operating chamber 29 formed in the cylinder head 20. This camshaft 30
Is the upper end portion 13 of the crankshaft 13 protruding from the crank chamber 23.
a drive pulley 31 mounted on a and a driven pulley 32 mounted on the upper end of the cam shaft 30 protruding from the cylinder head 20.
And a belt 33 wound between both pulleys 31 and 32, and driven by the crankshaft 13 via a winding transmission device. A generator 36 is further mounted on the drive pulley 31 at the upper end 13 a of the crankshaft 13.

The drive shaft 14 is connected to a lower end portion 13b of the crank shaft 13 which protrudes through the bottom wall of the crank chamber 23. A disc-shaped flywheel 34 is further connected to the lower end portion 13b by a screw 35 and extends parallel to the lower surface of the engine body. In this way, by providing the flywheel at the lower end of the crankshaft and the continuous portion with the drive shaft, torsional vibration of the engine is reduced.

In FIG. 3, 37 is an intake valve, 38 is an exhaust valve,
Rocker arms 39 and 39 are provided for each cylinder 24 with such a valve mechanism whose opening and closing are controlled by the cam shaft 30. Reference numeral 40 denotes an intake port provided in the cylinder head 20, and an intake pipe 41 connected to the intake port 40 extends forward along the side surface of the engine 4. 42 is a vaporizer, 42a
Is an intake silencer box. Such an intake pipe 41 is
They are provided for every 24 and are arranged side by side in the vertical direction along the side surface of the engine 4.

An exhaust passage 43 extends vertically in the other side portion of the engine 4, and the cylinders 24 are provided in the exhaust passage 43.
The exhaust port 44 corresponding to is communicating. The exhaust passage 43 communicates with an upper end of an exhaust pipe (not shown) extending in the extension case 2 in the vertical direction, and exhaust gas is discharged into the water through the exhaust pipe from the lower end thereof, for example, via a boss portion of a propeller. .

On the same side as the exhaust passage 43 of the engine 4, an electric equipment box 45 accommodating electric equipment is arranged in the front, and a starter motor 46 is arranged below the electric equipment box 45. 45a is a spark plug cord, which is connected to a spark plug on the side surface of the cylinder head 20. The output shaft 46a of the starter motor 46 projects downward and engages with a ring gear 47 (FIG. 2) provided on the outer circumference of the flywheel 34.

FIG. 4 is a bottom view of the main block of the engine 4 including the cylinder block 18 and the half crankcase 19 connected to the cylinder block 18. As can be seen from FIG. 4 and FIGS. At the lower part of the block 18, an overhanging portion 48a that juts out laterally of the engine along the plane of rotation of the cylinder head and in the lateral direction of the outboard motor.
The half-split crankcase 19 is also formed with an overhanging portion 48b that extends leftward and rightward, in the direction opposite to the cylinder head, and forward in the outboard motor. The outer peripheral edges of these overhanging portions 48a and 48b are respectively surrounded by enclosure walls projecting downward.
49a and 49b are provided. The surrounding walls 49a and 49b are joined to each other at the mating surface 18c to form a dish-shaped portion that opens downwards on the lower surface of the main blocks 18 and 19 (the left and right surrounding walls 49a are close to the cylinder head, and the outboard motor is provided). Are connected to each other at the rear).

On the lower surface of the cylinder block 18, the surrounding wall is
Further, a surrounding wall 50 is provided so as to be substantially concentric with the bearing portion 28 inside the 49a, and a semi-annular recess 51 is formed between the surrounding wall 50 and the surrounding wall 49a so as to open downward. There is. The front end surface of the surrounding wall 50 forms a part of the mating surface 18c and is fitted to the end surface of the branch portion 49b ₁ of the surrounding wall 49b on the half crankcase 19 side. The recess 51 is therefore closed at the front end.

FIG. 5 is an end view showing the end of the cylinder block 18 on the half-split crankcase 19 side. A packing surface 52 is provided on the end face from the skirt portion 18a to the lower protruding portion 48a along the outer contour thereof. 22a is a bolt hole through which the bolt 22 is inserted. Further, the end surface of the bottom wall 53 extending from the cylinder side and defining the lower part of the crank chamber 23 is also a packing surface 54 together with the end surfaces of the surrounding wall 50 on both sides thereof. Two left and right boss portions 55 are provided on the upper surface of the bottom wall 53 so as to extend toward the rear cylinder portion side. The end surface of the boss portion 55 forms a part of the packing surface 54, and these boss portions 55 are also provided with bolt holes 22a similar to the above.

A packing surface similar to the packing surface 52 and the packing surface 54 is also provided on the half crankcase 19 side, and the bolt 22 is inserted through the bolt hole 22a by aligning these packing surfaces. The block 18 and the half-split crankcase 19 are integrally combined to form a crank chamber.
Form 23. That is, the aforementioned mating surface 18c is formed by the packing surface 52 and the packing surface 54.

The crank bearing portion 28a has a skirt portion 18
The bearing wall 56 protruding from the inner wall surface of a is formed and supported, and is disposed in the skirt portion 18a. However, bearing 28a
The end surface of the bearing wall 56 is substantially flush with the packing surface 52, but the end surface of the bearing wall 56 is retracted rearward from these surfaces, that is, toward the cylinder side.

Bearing wall corresponding to the lowermost bearing portion 28a ₁
56 ₁ is formed integrally with the bottom wall 53,
The lower surface of the bearing portion 28a ₁ is located above the upper surface of the bottom wall 53,
A gap 57 is formed between the bearing portion 28a ₁ and the bottom wall 53. A relatively large diameter semi-circular hole 58 is bored in this portion of the bottom wall 53, and the enlarged lower end portion 13b of the crankshaft 13 penetrating the bearing portion 28a ₁ is inserted through the seal portion piece 59 to form this round portion. Fit in hole 58. Therefore, the gap 57 is oil-tightly blocked from the lower side of the bottom wall 53 by the crankshaft lower end portion 13b and the seal piece 59, and the outer peripheral portion of the bearing portion 28a ₁ is connected to the bottom wall 53.
When the half-split crankcase 19 having the same structure is mounted with the crankshaft 13 interposed therebetween, the gap 57 becomes a closed space sealed from the surroundings. However, by forming a slight recess in the end surface (the mating surface with the half-split crankcase 19) of the connecting portion between the outer peripheral portion of the bearing portion 28a ₁ and the bottom wall 53, the gap 57 is formed on both the left and right sides of the outer bottom wall. Communication hole 60 to communicate with the upper surface of 53
Are formed. Note bearing wall 56 ₁ is to continuously reinforce the wall in the side of the cylinder.

The flywheel 34 is attached to the lower end portion 13b of the crankshaft below the bottom wall 53 as described above. The flywheel 34 is covered by the bottom wall 53 and the upper wall of the overhanging portion 48b on the half-split crankcase 19 side (see FIG. 2), and has a substantially circular shape surrounded by the surrounding wall 50 and the surrounding wall 49b connected to the surrounding wall 50. It is housed in a downward facing recess. This recess forms the upper part of the flywheel chamber 61 (FIG. 2) that houses the flywheel 34. That is, the lower surface side of the bottom wall 53 corresponds to the ceiling of the flywheel chamber 61.

As shown in FIG. 2, a mount case 62 is attached with bolts to the flat lower surfaces of the main blocks 18 and 19 formed by the surfaces connecting the lower end surfaces of the surrounding walls 49a, 49b and 50. The engine 4 is mounted on the extension case 2. As shown in FIG. 6, on the upper surface of the mount case 62, a surrounding wall 63a that abuts against the surrounding wall 50 and an surrounding wall 63b that abuts against the surrounding wall 49b are projected in a continuous annular shape by these surrounding walls 63a and 63b. The enclosed portion closes the recess on the main block side in which the flywheel 34 is housed from below to form a flywheel chamber 61.

Further, an enclosure wall 63c that abuts the enclosure wall 49a.
Is provided so as to project between the surrounding wall 63a and the surrounding wall 63c.
A recess 51a is formed which is connected to the above and closes the recess 51 from below (see FIG. 7).

As shown in FIG. 4, the output shaft of the starter motor 46 that projects into the flywheel chamber 61 from above and engages with the ring gear 47 of the flywheel 34 on one side of the surrounding walls 50 and 63a. Recess 64 to accommodate 46a
Is provided.

The mount case 62 is connected to the pair of left and right connecting members 12 via a mount rubber 65 extending in the left-right direction. The mount rubber 65 is composed of a core material 65a and a rubber 65b surrounding the core material 65a.
It is bolted to a. The rubber 65b is a pressing member fastened to the bottom wall portion of the flywheel chamber 61 with a bolt 66.
It is held down from above by 67.

An oil pan 68 is attached to the flat lower surface of the mount case 62, which is formed below the portion forming the flywheel chamber 61 and rearward of the drive shaft 14, and hangs down inside the extension case 2. Has been paid. Inside the mount case 62 is the flywheel chamber.
A portion 62a forming 61 and a portion communicating with the oil pan 68
It is divided into 62b and.

Oil suction pipe having a strainer 69 at the lower end
70 extends upward from the bottom of the oil pan 68 through the oil suction passage 71a of the mount case 62 and is connected to the oil suction passage 71 formed in the lower portion of the cylinder block 18. The oil suction passage 71 is provided at the lower end of the cam shaft 30 and communicates with a suction port 73 of an oil pump 72 driven by the cam shaft 30. The oil suction pipe 70 may be connected to the oil suction passage 71 of the cylinder block 18 through the oil pan communication portion 62b and the oil return port 84 described later.

As shown in FIGS. 1 and 3, the oil pressurized by the oil pump 72 passes through a pump outlet 72a, an oil supply passage 91a located below the lowermost cylinder, and a bottomed relay of the mount case 62. It is sent to section 91b (see FIG. 6). Up to this point, the lubrication path of the conventional vertical engine is almost the same. In the relay portion 91b, the oil supply path rises upward and communicates with an oil supply path 91c that extends horizontally one cylinder above the lowermost cylinder, and the oil passes through the oil supply path 91c and the front surface of the half crankcase 19. Further, the oil is sent to the oil filter 74 mounted above the mating surface 5a between the engine cover and the under case (FIG. 1). With such an oil supply passage arrangement, even if there is a flywheel below the crank chamber and a flywheel chamber, and there is an oil return passage provided on the bottom wall of the crank chamber, the cylinder head does not interfere with them. Oil can be sent from the side to the crank chamber side. Further, the oil filter can be easily removed and replaced.

The oil discharged from the oil filter 74 flows into an oil passage 75 vertically arranged at the center of the front and left directions of the half-split crankcase 19, and further passes through an oil passage 76 to the crankshaft 13. It reaches the bearings 28 and lubricates the bearings of these bearings. This oil further reaches the inside of the crank pin bearing 78 and the cylinder 24 through the oil passage 77 formed in the crank shaft 13, and lubricates the crank pin bearing 78 and the inner surface of the cylinder. In addition, from the upper part of the oil passage 75,
It passes through the upper part of the cylinder block 18 via 13 and is sent to the cylinder head 20 side to lubricate the cam shaft 30.

The oil that has reached the inside of the cylinder 24 is the piston 25.
Is spread over the inner surface of the cylinder and scraped off into the crank chamber 23, but the thickness of the cylinder wall portion 79 defining the upper and lower cylinders 24 is the thickness of the bearing portion 28a connected thereto. Since it is thinner than the (width), a step a is formed in this portion, and oil is likely to remain in this step a. Therefore, the oil hole 80 that connects the upper and lower cylinders 24, 24 to this part
Is provided so that the remaining oil is dropped into the lower cylinder 24.

The oil hole 80 is formed in the skirt portion 18a of the cylinder block 18 and the opened half split crankcase.
By directing a drilling tool such as a drill diagonally upward from the mating surface side with 19, it can be easily drilled without interfering with other parts. Therefore, the oil hole 80 is formed obliquely upward from the lower surface side of the cylinder wall portion 79 toward the rear.

Similar oil holes 80 are also provided between the lower cylinders 24, and the oil in each cylinder 24 sequentially flows downward through these oil holes 80 and reaches the lowermost cylinder 24. . The oil hole is also on the lowermost cylinder 24.
The oil drop hole 81 similar to 80 is provided, but this oil drop hole 81 is in the plane including the axis line of the cylinder.
The bearing wall 56 ₁ of the bearing portion 28 a ₁ is bored (FIG. 5), and is opened in the gap 57. The oil drop hole 81 can also be formed in the packing surface 54 without making a hole by diagonally pointing the tool from the mating surface side with the half-split crankcase 19.

Since the lower part of the gap 57 is closed by the expanded lower end portion 13b of the crankshaft 13 and the seal piece 59,
The oil that has flowed into the gap 57 through the oil drop hole 81 does not flow into the flywheel chamber 61 that accommodates the lower flywheel 34, but passes through the communication holes 60 on the left and right, and on the adjacent upper surface portion 53a of the bottom wall 53. Spill to. Bottom bearing 28a ₁
The oil that directly comes out of the oil seal 58 from
Is returned through the.

However, since the outer surface of the adjacent upper surface portion 53a is blocked by the boss portion 55, the oil that extends rearward, that is, to the cylinder head side, penetrates the bearing wall 56 ₁ to guide the oil that has flowed out there. A return passage 82 is provided. As shown in FIG. 4, the oil return passage 82 reaches the upper position of the surrounding wall 50. Therefore the oil return passage
The oil passing through 82 is the recess formed on the outer side of the wall 50.
It flows into the inside 51 and falls into the inside of the recess 51a of the mount case 62 which receives the recess 51 from below.

[0045] Also in the outside of the boss portion 55, similar oil return passage 83 is provided through the bearing wall 56 _1, the recess 51a through the oil return passage 83 collects the return oil to the outside of the bottom wall 53 I am trying to drop it.

In this manner, the recess 51 on the cylinder block 18 side and the recess 51a on the mount case 62 side allow the outside of the flywheel chamber 61 to come from near the mating surface between the cylinder block 18 and the half crankcase 19. An oil return passage that surrounds a semi-annular shape toward the rear is formed. The bottom wall of this oil return passage, that is, the bottom wall 51b of the recess 51a, is
As shown in FIG. 2 and FIG. 7, it is inclined downward toward the rear, and an oil return port 84 is provided at the lowest end thereof (FIG. 6), and the oil pan communicating portion 62b of the mount case 62 is provided. It is open. Therefore, the oil return passage
The oil that has dropped into the recess 51a through the 82 and 83 flows to the oil return port 84 side on the bottom wall 51b, drops from the oil return port 84 to the oil pan communication portion 62b, and into the lower oil pan 68. Will be returned.

Thus, the flywheel chamber 61 below the crank chamber 23 is provided between the crank chamber 23 and the oil pan 68.
The oil return passage that bypasses the engine is formed without increasing the size of the engine. Furthermore, the outlet of this oil return passage, that is, the oil return port 84, is
Since it is provided at a position sufficiently lower than the bottom of the crank chamber 23 due to the inclination of b, even if the crank chamber 23 side becomes lower than the valve operating chamber 29 side due to the inclination of the outboard motor 1, etc., the crank chamber 23
The oil inside can be returned to the oil pan 68 without any trouble.

The oil lubricated around the camshaft 30 reaches the oil return port 86 through the oil passage 85, and the oil return passage
87, it is returned to the oil pan 68 via the oil return pipe 88.

[0049]

According to the present invention, in a vertical engine in which a crankshaft is oriented substantially vertically and a flywheel is provided at a lower end portion of the crankshaft which penetrates through a bottom wall of a crank chamber and is provided in a cylinder. The remaining oil can be favorably returned to the crank chamber side to ensure smooth oil circulation, and the returned oil can be prevented from entering the flywheel chamber below the bottom wall of the crank chamber.

[Brief description of drawings]

FIG. 1 is an overall side view of an outboard motor equipped with a vertical engine according to the present invention.

FIG. 2 is a vertical sectional side view of an engine.

FIG. 3 is a schematic plan view showing an engine in an engine cover together with its accessories.

FIG. 4 is a bottom view of an engine main block including a cylinder block and a half crankcase connected to the cylinder block.

FIG. 5 is an end view showing an end portion of the cylinder block on the half-split crankcase side.

FIG. 6 is a top view of a mount case.

FIG. 7 is a cross-sectional view showing a mount case coupled to a cylinder block, cut along an end surface of the cylinder block.

[Explanation of symbols]

1 ... Outboard motor, 2 ... Extension case, 3 ... Gear case, 4 ... Engine, 5 ... Engine cover, 6 ... Attachment device, 7 ... Stern, 8 ... Bracket, 9 ... Tilt shaft, 10 ... Swivel case, 11 ... Swivel Shaft, 12 ... Connecting member, 13 ... Crank shaft, 14 ... Drive shaft, 15 ... Forward / reverse switching device, 16 ... Propeller shaft, 17 ... Propeller, 18 ... Cylinder block, 19 ... Half crankcase, 20 ... Cylinder head, 21 ... Cylinder head cover, 22 ... Bolt, 23 ... Crank chamber, 24 ... Cylinder, 25 ... Piston, 26 ... Connecting rod, 27 ... Bolt, 28 ...
Bearing part, 29 ... Valve chamber, 30 ... Cam shaft, 31 ... Drive pulley, 32
… Driven pulley, 33… Belt, 34… Flywheel, 35
... screw, 36 ... generator, 37 ... intake valve, 38 ... exhaust valve, 39 ... rocker arm, 40 ... intake port, 41 ... intake pipe, 42 ... carburetor, 43 ... exhaust passage, 44 ... exhaust port, 45 ... electrical equipment Box, 46 ... Starter motor, 47 ... Ring gear, 48 ... Overhanging part, 49, 50 ... Enclosure, 51 ... Recess, 52 ... Packing surface, 53 ... Bottom wall, 54 ... Packing surface, 55 ... Boss section, 56 ... Bearing Wall, 57 ... Gap, 58 ... Round hole, 59 ... Sealing piece, 60 ... Communication hole, 61 ... Flywheel chamber, 62 ... Mount case, 63 ... Enclosure, 64 ... Recess, 65 ... Mount rubber, 66 ... Bolt, 67 ... Pressing member,
68 ... oil pan, 69 ... strainer, 70 ... oil suction pipe,
71 ... Oil suction passage, 72 ... Oil pump, 73 ... Suction port,
74 ... Oil filter, 75 ... Oil passage, 76, 77 ... Oil passage,
78 ... Crank pin bearing, 79 ... Cylinder wall part, 80 ... Oil hole, 81 ... Oil drop hole, 82, 83 ... Oil return passage, 84
… Oil return port, 85… Oil passage, 86… Oil return port,
87 ... oil return passage, 88 ... oil return pipe, 89 ... undercase, 90 ... undercover, 91 ... oil supply passage.

Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location F02F 7/00 301 B

Claims (3)

[Claims] 1. A crankshaft is directed substantially vertically,
In a vertical engine having a flywheel at a lower end protruding through a bottom wall of a crank chamber of the crankshaft, the crank chamber has a skirt portion integrally provided on a cylinder block and a mating surface on the skirt portion. A bearing wall portion on the cylinder block side that forms a crank bearing portion at a lowermost position in the crank chamber, and a lower surface side of the wall portion, and a lowermost cylinder. An oil drain hole communicating with the upper surface side of the wall portion inside is formed, which has a downward inclination from the cylinder side toward the mating surface with the half-split crankcase. Vertical engine. 2. An in-line multi-cylinder engine in which a plurality of cylinders are vertically arranged in the cylinder block, wherein the crank chamber side ends of respective cylinder wall portions defining adjacent upper and lower cylinders are respectively arranged. 2. The vertical engine according to claim 1, wherein an oil hole communicating with the upper and lower cylinders is formed obliquely upward from a mating surface side with the half-split crankcase. 3. A crank chamber bottom wall portion extending below the bearing wall portion to cover the flywheel from above,
The vertical engine according to claim 1, wherein an oil passage is formed to guide the oil from the oil drain hole to the cylinder head side.