JP4307465B2 - Vertical internal combustion engine - Google Patents

Description

  The present invention relates to a vertical internal combustion engine having a crankshaft oriented substantially in the vertical direction, and more particularly to a vertical internal combustion engine for an outboard motor.

  In the 4-cycle vertical internal combustion engine described in Japanese Patent Application Laid-Open No. Hei 7-149290, a flywheel is integrally mounted on the lower end of the crankshaft oriented in the vertical direction, and a lubricating oil pump is positioned above the flywheel. A drive gear is integrally provided on the crankshaft, located above the flywheel, and a gear speed increaser is interposed between the drive gear and the lubricating oil pump. It was designed to rotate at a higher speed than the shaft.

  In the 4-cycle vertical internal combustion engine disclosed in Japanese Patent Application Laid-Open No. 8-100606, the lubricating oil pump is directly connected to the lower end of the cam shaft oriented in the vertical direction.

Challenges to be solved

    In the one described in JP-A-7-149290, since the lubricating oil pump rotates at a higher speed than the crankshaft, even if the lubricating oil pump is small, it has a high discharge capacity. Due to the presence of the lubricating oil pump located below the pivot of the internal combustion engine that pivotally supports the shaft, the lower extension of the crankshaft becomes longer than the pivot, which stabilizes the flywheel with a large inertial mass in terms of vibration. It was difficult to support.

  Moreover, in the thing of Unexamined-Japanese-Patent No.8-110066, since the lubricating oil pump is not arrange | positioned above a flywheel, a flywheel can be arrange | positioned close to an internal combustion engine, As a result, a flywheel with a large inertial mass Can be stably supported. However, since the camshaft has a rotational speed that is half the rotational speed of the crankshaft, there is a problem that the discharge capacity is low and the lubricating oil pump inevitably becomes large.

SUMMARY OF THE INVENTION An object of the present invention is to provide an internal combustion engine that allows a better arrangement of a flywheel and a lubricating oil pump in a vertical crankshaft four-cycle internal combustion engine , and to mount a lubricating oil that lubricates the crankshaft. Is to provide an internal combustion engine provided with a lubricating device for effectively recirculating to an oil pan via

Means and effects for solving the problems

The present invention forms an internal combustion engine main body in which a crankshaft oriented in a substantially vertical direction is accommodated, a flywheel integrally provided at a lower end of the crankshaft, and a flywheel chamber for accommodating the flywheel. to an oil pump body which is provided below the flywheel, and the lubricating oil pump disposed below the said oil pump body, a mount case coupled to the lower of the internal combustion engine body, at below the flywheel An internal combustion engine main body that lubricates the crankshaft by sending an oil pan coupled to the lower side of the mount case and lubricating oil fed from the lubricating oil pump from the outer periphery of the oil pump body toward the center of the crankshaft comprising of a lubricating oil passage, wherein the mount case, the a oil pump body and another body, the oil pump body And a return oil passage for returning the lubricant from the internal combustion engine body to the oil pan, and a lubricant passage for collecting the lubricant lubricating the crankshaft and returning the lubricant to the oil pan. This is a characteristic four-cycle vertical internal combustion engine.

Since the invention according to claim 1 is configured as described above, the flywheel approaches the internal combustion engine main body, and the flywheel is stably supported no matter how the rotational speed changes. Is done. In addition, even if the lubricating oil pump is disassembled for maintenance of the lubricating oil pump, there is no need to remove the flywheel and the oil pump body, and the disassembling and assembling work can be performed efficiently and easily. Since the flywheel chamber can be sealed, adhesion of the lubricating oil to the flywheel can be prevented, and power loss and deterioration of the lubricating oil can be avoided. The lubricating oil that has lubricated the crankshaft can be smoothly returned to the oil pan through the mount case.

According to a second aspect of the present invention, in the four-cycle vertical internal combustion engine according to the first aspect, the main body of the internal combustion engine includes a cylinder block that pivotally supports the crankshaft from both sides and a half crankcase, The oil pump body is assembled to a lower portion of the internal combustion engine body by a fixing means, and the mount case surrounds an outer periphery of the oil pump body and is oil-tightly coupled to a lower surface of the internal combustion engine body. And As a result, the return of the lubricating oil can be performed more smoothly.

According to a third aspect of the present invention, in the four-cycle vertical internal combustion engine according to the first or second aspect, the cylinder block and the crankcase constituting the main body of the internal combustion engine are lubricated by lubricating the crankshaft on the lower surface thereof. A flat oil passage space that receives oil, a partition wall that partitions the flat oil passage space, a partition space that is partitioned from the flat oil passage space by the partition wall, and a partition wall that is formed in the partition wall and partitions the flat oil passage space A return oil passage communicating with the space and a vertical communication hole provided in the partition space are provided, and the vertical communication hole communicates with the inside of the mount case.

According to a fourth aspect of the present invention, in the four-cycle vertical internal combustion engine according to the first, second, or third aspect, the lubricating oil that has lubricated the crankshaft in the mount case is collected and returned to the oil pan. The oil passage is constituted by a partition space formed in the mount case and a return oil hole formed in the bottom of the cut space.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, an embodiment of the present invention illustrated in the drawings will be described.
A vertical internal combustion engine 1 according to the present invention is an in-line four-cylinder water-cooled four-cycle internal combustion engine in which a crankshaft 30 is directed vertically and a cylinder 32 is directed rearward of a hull, as shown in FIG. In addition, the main body case of the outboard motor 0 includes an internal combustion engine cover 2 that covers the saddle type internal combustion engine 1, an extension case 3 below it, a gear case 4, and the like. A mount case 5 and an oil pan 6 are sequentially stacked below the vertical internal combustion engine 1 so as to be integrally coupled to the vertical internal combustion engine 1.

  As shown in FIG. 1, a bracket 8 of a mounting device 7 is integrally fixed to a stern 19 of a motor boat (not shown), and a front end of a swivel case 10 is mounted on a tilt shaft 9 that is horizontally mounted on the upper end of the bracket 8. Is pivotally supported so as to be swingable up and down, and the outboard motor 0 is integrally attached to the upper and lower portions of the swivel portion of the swivel case 10 via a connecting means 11 having a mount M. A steering handle (not shown) is provided, and the mounting device 7 includes a bracket 8, a tilt shaft 9, and a swivel case 10. When the steering handle is swung left and right, the swivel portion of the swivel case 10 and the outboard Machine 0 is turned left and right.

  Further, a drive shaft 12 is integrally coupled to the lower end of the crankshaft 30 oriented in the vertical direction in the vertical internal combustion engine 1, and the drive shaft 12 extends downward in the gear case 4 to reach the gear case 4. The lower end of 12 is connected to a propeller shaft 14 via a forward / reverse switching device 13 in the gear case 4, and the propeller 15 passes through a crankshaft 30, a drive shaft 12, a forward / reverse switching device 13 and a propeller shaft 14. Thus, the power of the saddle type internal combustion engine 1 is transmitted and the propeller 15 is driven to rotate.

  Furthermore, the forward / reverse operating shaft 16 penetrating up and down in the swivel case 10 extends downward to reach the forward / reverse switching device 13, and when the operating lever 17 at the upper end of the forward / reverse operating shaft 16 is swung left and right. The forward / reverse switching device 13 is switched, and the propeller 15 is rotated forward or reverse.

  The main body of the vertical internal combustion engine 1 includes a crankcase 20, a cylinder block 21, a cylinder head 22, a head cover 23, a mount case 5, and an oil pan 6. These crankcase 20, cylinder block 21, The cylinder head 22 and the head cover 23 are arranged from the front to the rear of the hull and are integrally coupled to each other with bolts 24, 25, 26, and 28 as shown in FIGS. As described above, the mount case 5 and the oil pan 6 are integrally coupled to the crankcase 20 and the cylinder block 21 by bolts (not shown) on the lower surfaces of the cylinder block 21 and the cylinder block 21.

  Further, as shown in FIG. 4, the crankshaft 30 oriented in the vertical direction is pivotally supported via a journal 31 by a crankshaft support portion 103 of the crankcase 20 and the cylinder block 21, and is horizontally and longitudinally supported. A cylinder 32 oriented in the direction is provided in the cylinder block 21 at substantially equal intervals in the vertical direction, and a piston 33 is slidably fitted into the cylinder 32. The piston 33 is connected to the crankshaft 30 via a connecting rod 34. The crankshaft 30 is driven to rotate clockwise as seen from above and below as the piston 33 moves back and forth.

  Moreover, as shown in FIGS. 7 to 10, in the valve operating chamber 35 formed by the cylinder head 22 and the head cover 23, a bolt 29 is attached to the top surface of the cylinder head 22 (the rear surface with respect to the hull). The camshaft holder 36 and the cylinder head 22 are rotatably supported by a camshaft 38 via a journal 37. The camshaft holder 36 has a rocker shaft parallel to the left and right of the camshaft 38 with respect to the hull. 39, 40 are supported, rocker arms 41, 42 are pivotally supported on the rocker shafts 39, 40, and intake valves 43, exhaust valves 44 are in contact with the respective ends of the rocker arms 41, 42, respectively. The intake valve 43 and the exhaust valve 44 are opened and closed intermittently once every two rotations of the crankshaft 30 by a camshaft 38 that is driven to rotate at half the number of rotations of the crankshaft 30 by a valve operating device 55 described later. It is designed to be driven.

  Further, as shown in FIG. 8, the intake passage 45 opened and closed by the intake valve 43 is connected to the downstream end of the intake manifold 47 located on the right side of the hull of the cylinder block 21 (left side in FIG. 2). As shown in the drawing, the upstream end of the intake manifold 47 is connected to an intake chamber 49 via a throttle valve 48, and an intake port (not shown) of the intake chamber 49 is opened in the internal combustion engine cover 2. The air is sucked into the intake chamber 49 in the internal combustion engine cover 2 from the suction port 2a (see FIG. 1) of the internal combustion engine cover 2, and the air sucked into the intake chamber 49 is the throttle valve 48 and the intake manifold. It is led to the intake passage 45 via 47.

  Further, as shown in FIG. 8, the exhaust passage 46 opened and closed by the exhaust valve 44 is directed to the left side of the hull (right side in FIG. 8), and its downstream end is directed to the cylinder block 21 (toward the front of the hull). The exhaust passage 50 in the cylinder block 21 that is bent and connected to the exhaust passage 46 is oriented in the vertical direction, and its lower end opens into the exhaust hole 51 as shown in FIGS. The exhaust hole 51 communicates with the exhaust passage 52 of the mount case 5, and the upper end of the exhaust pipe 53 shown in FIG. 1 is connected to the lower end of the exhaust passage 52, and the lower end of the exhaust pipe 53 opens into the extension case 3. The exhaust discharged from the exhaust pipe 53 into the extension case 3 passes through the space in the gear case 4 and is discharged into the water from the exhaust passage 54.

  Further, a valve operating device 55 is disposed above the crankcase 20 and the cylinder block 21 as shown in FIG. That is, as shown in FIGS. 2 and 4, the drive pulley 56 is integrally fitted to the upper portion of the crankshaft 30 and the driven pulley 57 is integrally fitted to the upper end of the camshaft 38. An idler pulley 58 is rotatably supported, and an endless belt 59 is stretched over the drive pulley 56, the driven pulley 57, and the idler pulley 58.

  2, 4, and 6, the balancer drive pulley 60 is integrally fitted to the crankshaft 30 above the drive pulley 56, and is positioned to the left and right with the cylinder 32 interposed therebetween. Balancer driven pulleys 61, 62 are rotatably provided, and an idler pulley 63 is pivotally concentrically with the idler pulley 58. It is being transported.

  Further, as shown in FIGS. 2 and 6, the balancer driven pulley 61 on the left side of the hull (right side in FIGS. 2 and 6) is integrated with a balancer shaft 65 on the left side that is rotatably supported by the cylinder block 21. The balancer shaft 66, which is fitted and arranged in a bilaterally symmetrical position with the balancer shaft 65 and the cylinder 32 interposed therebetween, is connected to the cylinder block 21 at the lower part, the balancer pivot bracket 67 at the upper part, and the balancer pivot bracket 67. A drive gear 69 integrated with the balancer shaft 66 and a driven gear 70 integrated with the balancer driven pulley 62 are meshed with each other so that the balancer shafts 65 and 66 are pivotally supported by the bracket cover 68 attached. Are driven to rotate in the opposite directions at the same rotational speed.

  Further, as shown in FIGS. 2 and 4, a bracket 71 is mounted on the upper surface of the crankcase 20, and one end 72a of an alternator 72 is pivotally attached to one end 71a of the bracket 71. The other end 72b of the alternator 72 is movably attached to the arc groove 71b at the other end of the bracket 71. The other end 72b is fixed to the bracket 71 by a fixing means (not shown) and is driven to the upper end of the crankshaft 30. The pulley 73 is integrally fitted, and a driven pulley 74 is integrally fitted to the upper end of the rotating shaft of the AC generator 72. An endless belt 75 is stretched over the drive pulley 73 and the driven pulley 74.

  4 and 5, a flywheel 76 is integrally fitted with a bolt 78 to the lower end of the crankshaft 30, and a ring gear 77 is formed on the outer periphery of the flywheel 76. The upper end of the drive shaft 12 is spline fitted to the coupling member 79 mounted on the lower surface. As shown in FIGS. 11 and 12, a drive pinion (not shown) is disposed in an arcuate recess 80 formed in the lower surface of the cylinder block 21, and the drive pinion is engaged with a ring gear 77. When the drive pinion is rotated by the illustrated starter motor S, the ring gear 77, the flywheel 76, and the crankshaft 30 are rotationally driven.

  Next, the lubrication system of the vertical internal combustion engine 1 will be described. As shown in FIG. 4, an oil pump body 82 of a trochoid type lubricating oil pump 81 is mounted on the lower surfaces of the crankcase 20 and the cylinder block 21, and the rotor 83 of the lubricating oil pump 81 is integrally fitted to the coupling member 79. The pump chamber 84 of the lubricating oil pump 81 is sealed with a lid 85, the suction port 86 of the lubricating oil pump 81 opens downward, and the upper end of the suction pipe 88 is connected to the suction port 86. The suction pipe 88 passes through a return oil hole 116, which will be described later, and extends downward in the oil pan 6. A strainer 89 is connected to the lower end of the suction pipe 88.

  Further, as shown in FIGS. 3, 5, 10 and 11, the discharge port 87 of the lubricating oil pump 81 is connected to the vertical oil passage 90 of the cylinder block 21, and the upper end of the vertical oil passage 90 is Connected to the front and rear horizontal oil passages 91 facing the crankcase 20 in front of the hull, the front and rear horizontal oil passages 91 are connected to the front and rear horizontal oil passages 92 of the crankcase 20 and upward toward the front end of the front and rear horizontal oil passages 92 The lower end of the vertical oil passage 93 is connected, and the upper end of the vertical oil passage 93 is connected to a front / rear horizontal oil passage 94 facing leftward (rightward in FIG. 3).

  Further, as shown in FIGS. 3 and 9, the left end of the front / rear horizontal oil passage 94 is connected to the suction part 96 of the oil filter 95, and the discharge part 97 of the oil filter 95 is connected to the left side (see FIG. 3 is connected to a communication oil passage 98 facing right).

Further, as shown in FIGS. 3 and 9, the communication oil passage 98 is communicated with a crankshaft oil passage 99 positioned substantially in the center in the left-right width direction and directed in the vertical direction, and on both left and right sides thereof. position and balancer shaft oil passages 100, 101 facing vertically is communicating.

  As shown in FIGS. 7 and 10, a crankshaft oil passage 102 that extends horizontally rearward is formed in the crankshaft support portions 103 in the middle and upper and lower ends of each cylinder 32, and the front end of the crankshaft oil passage 102. Is connected to the journal 31 of the crankshaft 30, and the journal 31 of the crankshaft 30 is pumped by the lubricating oil pump 81, filtered by the oil filter 95, and lubricated by the lubricating oil via the oil passage described above. It has become so.

  In addition, as shown in FIGS. 7 and 10, balancer shaft oil passages 104, 105 are formed in the uppermost crankshaft supporting portion 103a so as to extend horizontally rearward over the crankcase 20 and the cylinder block 21, and The front ends of the balancer shaft oil passages 104 and 105 (lower end in FIG. 10) communicate with the balancer shaft oil passages 100 and 101, respectively, and the rear ends (upper end in FIG. 10) of the balancer shaft oil passages 104 and 105 are balancers. As shown in FIG. 6, the upper end support portion 65 a of the balancer shaft 65 is lubricated with lubricating oil discharged from the rear end of the balancer shaft oil passage 104. The lubricating oil that has lubricated the upper end pivot portion 65a of the balancer shaft 65 falls due to gravity, reaches the lower end pivot portion 65b of the balancer shaft 65, and the lower end pivot portion 65b is also lubricated.

  As shown in FIG. 6, the upper end of the balancer shaft oil passage 105 is connected to the balancer shaft oil passage 106 of the cylinder block 21 and the balancer pivot support bracket 67, and the balancer shaft oil passage 106 is connected to the cam shaft of the bracket cover 68. Connected to the oil passage 107, the upper end of the camshaft oil passage 107 is opened to the pivot portion 62a of the balancer driven pulley 62, and the pivot portion 62a is also lubricated.

Further, as shown in FIG. 7, a camshaft oil passage 107 is formed in the upper part of the cylinder block 21 so as to be obliquely rearward in the horizontal direction, and the front end of the camshaft oil passage 107 is connected to the uppermost crankshaft supporting portion 103a. A front end of a camshaft oil passage 108 that is connected to the journal 31a and extends horizontally rearward is connected to the rear end of the camshaft oil passage 107, and the rear end of the camshaft oil passage 108 is connected to the communication passage 27 of the cylinder head 22. The cylinder block 21 and the cylinder head 22 are connected to the cam shaft oil passage 109 of the cylinder head 22 through the insertion hole 26a of the bolt 26 that mutually connects the cam shaft oil passage 109, and the rear end of the cam shaft oil passage 109 is connected to the cam shaft 38. A rocker oil passage 110 is formed in the camshaft holder 36 and is opened in the shaft support portion 38a and opened in the shaft support portion 38a of the camshaft 38. A part of the lubricating oil supplied to the uppermost journal 31a is Via shaft oil passage 107, cam shaft oil passage 108, cam shaft oil passage 109 It is sent to the shaft support 38a of the cam shaft 38 Te, so that the shaft support 38a of the cam shaft 38 are lubricated. The remainder of the lubricating oil supplied to the shaft support portion 38a of the cam shaft 38 is sent to the center holes (not shown) of the rocker shafts 39 and 40 via the rocker oil passage 110, and each rocker arm 41 is sent from the center hole. , 42 is fed to a pivot (not shown) to lubricate the pivot.

  Further, as shown in FIGS. 5, 6, 14, 15, and 16, flattening along the horizontal plane is provided at the center of the vertical width of the lowermost crankshaft supporting portion 103b in the crankcase 20 and the cylinder block 21. Oil passage spaces 111a and 111b are respectively formed (only the flat oil passage space 111b of the cylinder block 21 is shown in the cross-sectional views of FIGS. 15 and 16), and the flat oil passage spaces 111a and 111b are formed. The outer periphery of b is partitioned by partition walls 112a and 112b. As shown in FIGS. 12 and 14, partition spaces outside the partition walls 112a and 112b of the crankcase 20 and the cylinder block 21 are provided. 113 a, 113 b and the flat oil passage spaces 111 a, 111 b communicate with each other through return oil passages 114 a, 114 b, and vertical communication holes 136 a, 136 b are provided below the partition spaces 113 a, 113 b. The mount case 5 is formed 12, a partition space 115 communicating with the vertical communication holes 136a and 136b is formed, and a return oil hole 116 communicating with the space in the oil pan 6 is formed below the partition space 115, as shown in FIG. Is formed.

  Moreover, as shown in FIGS. 1 and 4, the valve operating chamber 35 surrounded by the cylinder head 22 and the head cover 23 is mounted via the return oil hole 117 of the cylinder head 22 and the return oil passage 118 of the cylinder block 21. The oil passage space 119 of the case 5 communicates with the oil passage space 119 of the mount case 5 through the communication pipe 120, and the oil passage space 119 is sealed by the cover plate 121 and penetrates the cover plate 121. The upper end of the return oil pipe 122 communicating with the oil passage space 119 is integrally attached to the cover plate 121, and the lower end of the return oil pipe 122 is opened at the bottom of the oil pan 6.

Then, as shown in FIG. 6, a processing hole 133 for inserting the balancer shafts 65, 66 from the uppermost crankshaft supporting portion 103a to the lower crankshaft supporting portion 103 is directed downward from above. vertically dividing wall 103 of the lowermost stage while being formed by the inserted not shown tool Te ba, 103 bb than this diameter machining holes 134 a, 134 b are formed respectively on the divided lower wall 103 bb of said lower A plug 135 is fitted into the processed hole 134b, and the oil passage space 111b is sealed against the space A of the flywheel below.

  The cooling system of the vertical internal combustion engine 1 will be described. As shown in FIG. 1, a cooling water pump 123 that is rotationally driven by a drive shaft 12 is provided at the joint between the extension case 3 and the gear case 4, and a water inlet 124 is formed on the side wall of the gear case 4. Further, a net (not shown) is stretched at the water inlet 124, and water that has entered the gear case 4 from the water inlet 124 is sucked in by the cooling water pump 123 and supplied to the vertical internal combustion engine 1 through the water inlet pipe 125. It has come to be.

  Further, as shown in FIGS. 11 and 12, the exhaust passage 52 that passes through the mount case 5 in the vertical direction and the exhaust hole 51 that communicates with the exhaust passage 52 and passes through the cylinder block 21 in the vertical direction are positioned on the outer periphery. Thus, cooling water rising passages 126, 127, 128, and 129 are formed in the mount case 5 and the cylinder block 21, and a cooling water lowering passage 130 is formed.

  Further, the cylinder block 21 is formed with a cooling water passage 137 (see FIG. 8) communicating with the cooling water rising passage 126 (see FIG. 11 and FIG. 12) of the mount case 5, and the cooling water passage 137 is shown in FIG. 17, the cooling water passage 138 communicates with the cooling water passage 138 outside the exhaust passage 50, and the cooling water passage 138 communicates with the cooling water passage 139 of the cylinder head 22.

  Furthermore, a water jacket 140 is formed in the cylinder block 21 so as to communicate with the cooling water rising passage 127 of the mount case 5 shown in FIGS. 11 and 12, and the open end of the water jacket 140 is formed in FIGS. As shown in the figure, the cylinder head 22 communicates with the cooling water passage 141.

  Moreover, as shown in FIGS. 8 and 17, the cooling water rising passage 128 of the mount case 5 is positioned closer to the matching portion of the cylinder block 21 and the cylinder head 22 than the exhaust passage 50, and the cooling water passage to the cylinder block 21. 142 is formed, and a cooling water passage 143 communicating with the cooling water passage 142 is formed in the cylinder head 22.

  Further, as shown in FIG. 8, a cooling water passage 144 outside the cooling water passage 137 communicating with the cooling water rising passage 129 is formed in the cylinder block 21 and adjacent to the cooling water passages 137, 138, 144. Thus, the cooling water passage 145 is formed, and the cooling water passage 145 communicates with the cooling water lowering passage 130 of the mount case 5. The cooling water absorbed by the cooling water pump 123 is supplied to the cooling water rising passage of the mount case 5. 126, 127, 128, 129 are supplied to the cooling water passages 139, 141, 143 of the cylinder head 22 via the cooling water passages 137, 138, 142, 144 of the cylinder block 21 and the water jacket 140, and The cooling water passage 145 is discharged to the outside through the cooling water descending passage 130 of the mount case 5.

  Further, as shown in FIG. 8, a breather passage 147 communicating with the crank chamber 146 and the valve operating chamber 35 is communicated with the breather chamber 149 through a hole 148.

  Since the embodiment of the present invention is configured as described above, when the saddle type internal combustion engine 1 is started and put into operation, as shown in FIG. The rotor 83 of the oil pump 81 rotates, and the lubricating oil in the oil pan 6 is sucked into the pump chamber 84 from the strainer 89 through the suction pipe 88 and the suction port 86, and is shown in FIGS. As described above, the oil is sent to the suction portion 96 of the oil filter 95 through the vertical oil passage 90, the front and rear horizontal oil passage 91, the front and rear horizontal oil passage 92, the vertical oil passage 93, and the front and rear horizontal oil passage 94, and is sent to the oil filter 95. After being filtered, the oil is supplied to the crankshaft oil passage 99, the balancer shaft oil passage 100, and the balancer shaft oil passage 101 via the communication oil passage 98.

  As shown in FIGS. 7 and 10, the lubricating oil supplied to the crankshaft oil passage 99 passes through the crankshaft oil passage 102 that is provided in the crankshaft support 103 and faces the rear of the hull. It is sent to the journal 31 and the journal 31 is lubricated.

  As shown in FIG. 4, the lubricating oil that has lubricated the journal 31 passes through the communication hole 131 of the lower crankshaft supporting portion 103 in the cylinder block 21, flows into the lower crank chamber 132, and successively. The lubricating oil that passes through the lower crank chamber 132 and flows out into the flat oil passage space 111b of the lowermost crankshaft support portion 103b and flows into the flat oil passage space 111b is shown in FIGS. As shown in the figure, it falls to the upper surface of the mount case 5 via the return oil hole 114b, the partition space 113b, and the vertical communication hole 136b toward the side, and the lowermost crankshaft support 103 in the crankcase 20 The lubricating oil that has flowed into the flat oil passage space 111a of b falls to the upper surface of the mount case 5 through the partition space 113a and the vertical communication hole 136a, and the lubricating oil accumulated on the upper surface of the mount case 5 12 As illustrated in beauty Figure 13, it falls from the return oil passage 116 provided in the mount case 5 in the oil pan 6.

As also shown in Figure 7, of the lubricating oil supplied to the journal 31a of the crankshaft 30 via the crankshaft oil passage 102 a of the uppermost crankshaft supporting portion 103 a, lubricate the di catcher Naru 31a The remaining lubricating oil is supplied to the lubricating portion 38a of the camshaft 38 via the camshaft oil passages 107 and 108 and the camshaft oil passage 109, and the lubricating portion 38a is lubricated. This remaining lubricating oil is supplied into the camshaft 38 via the rocker oil passage 110, and the frictional portion of the valve operating device is lubricated with this lubricating oil, which accumulates in the valve operating chamber 35, and As shown in FIG. 4, the lubricating oil in the valve operating chamber 35 flows into the oil passage space 119 of the mount case 5 via the return oil passage 117, the return oil passage 118, and the communication pipe 120 in parallel therewith. Then, the oil returns to the bottom of the oil pan 6 through the return oil pipe 122.

Further, as shown in FIGS. 7, 9, and 10, the lubricating oil flowing into the balancer shaft oil passages 100, 101 from the communication oil passage 98 passes through the balancer shaft oil passages 104, 105 to the balancer shafts 65, 66. On the other hand, as shown in FIG. 6, the upper pivot portions 65a, 66a of the balancer shafts 65, 66 are lubricated, and the lubricating oil that lubricates them is lowered by gravity, and the lower pivot portions of the balancer shafts 65, 66 Since the portions 65b and 66b are lubricated, only the balancer shaft oil passages 104 and 105 are provided in the balancer shafts 65 and 66, respectively, so that the intermediate bearing portion and the lower end bearing portion of the balancer shafts 65 and 66 are also lubricated. Is greatly simplified and the cost can be reduced.

  Further, as shown in FIG. 6, the lubricating oil that has flowed into the balancer shaft oil passage 106 from the upper end of the balancer shaft oil passage 105 passes through the cam shaft oil passage 107 and is pivotally supported by the pivot 62a of the balancer driven pulley 62. Since the pivot 62a is also lubricated, each of these lubrication structures is simplified.

As shown in FIG. 6, the lubricating oil that has lubricated the balancer shafts 65 and 66 falls downward and flows into the oil passage space 111b through the machining hole 134a of the lowermost crankshaft support portion 103b. and lubricating oil in the oil passage space 111 b flows into the partition space 113 b through the return oil hole 114 b as illustrated in Figure 14, the lubricating oil of the partition space 113, the mount of FIG. 13 The oil flows into the partition space 115 of the case 5, and the lubricating oil in the partition space 115 returns to the oil pan 6 through the return oil hole 116 .

  Further, a machining hole 133 that penetrates the balancer shafts 65 and 66 shown in FIG. 6 and pivotally supports the upper ends of the balancer shafts 65 and 66 by the uppermost crankshaft support portion 103a, and a balancer shaft by the lowermost crankshaft support portion 103b. The machining holes 134a that pivotally support the lower ends of 65 and 66 and the lower machining holes 134b are arranged in a straight line, so that machining by a tool (not shown) is facilitated, and the machining holes 134a and 134 are facilitated. Since the lower end portion of the tool is supported by b and the machining hole 133 above it can be finished, the production is high. Even if the lower processing hole 134b exists, the plug 135 is fitted in the processing hole 134b, so that the lubricating oil in the oil passage space 111 can flow into the flywheel space A below the processing hole 134b. Absent.

  Further, as shown in FIGS. 7, 17 and 18, the camshaft oil passages 107 and 108, the communication passage 27, the insertion hole 26a and the camshaft communicating from the uppermost journal 31a of the crankshaft 30 to the shaft support portion 38a of the camshaft 38. Since the shaft oil passage 109 is disposed on the side opposite to the exhaust passage 50, the lubricating oil passing through these oil passages is hardly heated and deterioration is suppressed.

  Furthermore, since the bolts 26 are arranged at substantially equal distances from the center of the cylinder 32 and at substantially intervals along the circumferential direction of the cylinder 32, the cylinder 32 has a large diameter in order to increase the size of the vertical internal combustion engine 1. Even so, the mating surfaces of these outer edges are crimped substantially evenly.

1 is a longitudinal side view of an outboard motor equipped with a vertical internal combustion engine according to the present invention. It is a top view of the internal combustion engine. It is a front view of the internal combustion engine. It is a vertical side view of the internal combustion engine. FIG. 3 is a front view of a split surface of a cylinder block with respect to a crankcase of the internal combustion engine. It is a cross-sectional front view which passes along the balancer axis | shaft of the said internal combustion engine. It is sectional drawing cut | disconnected along the VII-VII line of FIG. It is sectional drawing cut | disconnected along the VIII-VIII line of FIG. It is sectional drawing cut | disconnected along the IX-IX line of FIG. It is sectional drawing cut | disconnected along the XX line of FIG. It is drawing which looked at the crankcase and the cylinder block from the lower part. It is a top view of a mount case. It is sectional drawing cut | disconnected along the XIII-XIII line | wire of FIG. FIG. 6 is a cross-sectional view taken along line XIV-XIV in FIG. 5. It is sectional drawing cut | disconnected along the XV-XV line | wire of FIG. It is sectional drawing cut | disconnected along the XVI-XVI line | wire of FIG. It is drawing which illustrated the mating surface of a cylinder block. It is drawing which illustrated the mating surface of a cylinder head.

Explanation of symbols

DESCRIPTION OF SYMBOLS 0 ... Outboard motor, 1 ... Vertical type internal combustion engine, 2 ... Internal combustion engine cover, 3 ... Extension case, 4 ... Gear case, 5 ... Mount case, 6 ... Oil pan, 7 ... Mounting apparatus, 8 ... Bracket, 9 ... Tilt Axis, 10 ... swivel case, 11 ... coupling means, 12 ... drive shaft, 13 ... forward / reverse switching device, 14 ... propeller shaft, 15 ... propeller, 16 ... forward / reverse operation shaft, 17 ... operation lever,
19 ... Stern, 20 ... Crankcase, 21 ... Cylinder block, 22 ... Cylinder head, 23 ... Head cover, 24 ... Bolt, 25 ... Bolt, 26 ... Bolt, 27 ... Communication hole, 28 ... Bolt, 29 ... Bolt, 30 ... Crankshaft, 31 ... Journal, 32 ... Cylinder, 33 ... Piston, 34 ... Connecting rod, 35 ... Valve chamber, 36 ... Camshaft holder, 37 ... Journal, 38 ... Camshaft, 39 ... Rocker shaft, 40 ... Rocker shaft , 41 ... Rocker arm, 42 ... Rocker arm, 43 ... Intake valve, 44 ... Exhaust valve, 45 ... Intake passage, 46 ... Exhaust passage, 47 ... Intake manifold, 48 ... Throttle valve, 49 ... Intake chamber, 50 ... Exhaust passage , 51 ... Exhaust hole, 52 ... Exhaust passage, 53 ... Exhaust pipe, 54 ... Exhaust passage, 55 ... Valve train, 56 ... Dry pulley, 57 ... Driven pulley, 58 ... Idler pulley, 59 ... Endless belt, 60 ... Balancer drive Pulley, 61 ... Balanced driven pulley, 62 ... Paransadori Bun pulley, 63 ... idler pulley, 64 ... endless belt, 65 ... balancer shaft, 66 ... balancer shaft, 67 ... balancer pivot bracket, 68 ... bracket cover, 69 ... drive gear, 70 ... driven gear, 71 ... bracket, 72 ... alternating current Generator, 73 ... Drive pulley, 74 ... Driven pulley, 75 ... Endless belt, 76 ... Flywheel, 77 ... Ring gear, 78 ... Bolt, 79 ... Coupling member, 80 ... Arc-shaped recess, 81 ... Lubricating oil pump, 82 ... Oil pump body, 83 ... rotor, 84 ... pump chamber, 85 ... lid, 86 ... suction port, 87 ... discharge port, 88 ... suction pipe, 89 ... strainer, 90 ... vertical oil passage, 91 ... front and rear horizontal oil passage, 92 ... Front and rear horizontal oil passages, 93 ... Vertical oil passages, 94 ... Front and rear horizontal oil passages, 95 ... Oil filter, 96 ... Suction part, 97 ... Discharge part, 98 ... Communication oil passage, 99 ... Crankshaft oil passage, 100 ... Balancer Shaft oil passage, 101… Balancer shaft oil passage, 102… Clan Shaft oil passage, 103 ... crankshaft support, 104 ... balancer shaft oil passage, 105 ... balancer shaft oil passage, 106 ... balancer shaft oil passage, 107 ... camshaft oil passage, 108 ... camshaft oil passage, 109 ... camshaft oil 110, ... Rocker oil passage, 111 ... Flat oil passage space, 112 ... Partition wall, 113 ... Partition space, 114 ... Return oil hole, 115 ... Partition space, 116 ... Return oil hole, 117 ... Return oil passage, 118 ... Return oil passage, 119 ... Oil passage space, 120 ... Communication pipe, 121 ... Cover plate, 122 ... Return oil pipe, 123 ... Cooling water pump, 124 ... Water inlet, 125 ... Water absorption pipe, 126 ... Cooling water rising passage, 127 ... Cooling water rising passage, 128 ... Cooling water rising passage, 129 ... Cooling water rising passage, 130 ... Cooling water falling passage, 131 ... Communication hole, 132 ... Crank chamber, 133 ... Processing hole, 134 ... Processing hole, 135 ... , 136 ... vertical communication holes, 137, 138, 139 ... cooling water passages, 140 ... water jackets, 141, 142, 143, 144, 145 ... cooling water passage, 146 ... Crank chamber 147 ... breather passage, 148 ... hole, 149 ... breather chamber.

Claims (4)

An internal combustion engine body in which a crankshaft oriented in a substantially vertical direction is accommodated;
A flywheel integrally provided at the lower end of the crankshaft;
An oil pump body provided below the flywheel so as to form a flywheel chamber for accommodating the flywheel;
A lubricating oil pump disposed below the oil pump body;
A mount case coupled to the lower part of the internal combustion engine body;
An oil pan coupled below the mount case below the flywheel ;
Lubricating oil sent from the lubricating oil pump is sent from the outer periphery of the oil pump body toward the center of the crankshaft, and the lubricating oil passage of the internal combustion engine body that lubricates the crankshaft ;
With
The mount case is separate from the oil pump body and is disposed below the oil pump body and lubricates the crankshaft and a return oil passage for returning lubricating oil from the internal combustion engine body to the oil pan. A four-stroke vertical internal combustion engine having a lubricating oil passage for collecting lubricating oil and returning the lubricating oil to the oil pan. The internal combustion engine body is composed of a cylinder block and a half-shaped crankcase that pivotally support the crankshaft from both sides,
The oil pump body is assembled to the lower part of the internal combustion engine body by a fixing means,
The four-stroke vertical internal combustion engine according to claim 1, wherein the mount case surrounds an outer periphery of the oil pump body and is oil-tightly coupled to a lower surface of the internal combustion engine body. A cylinder block and a crankcase constituting the internal combustion engine main body have flat oil passage spaces that receive lubricating oil that lubricates the crankshaft on their lower surfaces, a partition wall that partitions the flat oil passage space, and the partition wall. A partition space partitioned from the flat oil passage space, a return oil passage formed in the partition wall for communicating the flat oil passage space with the partition space, and a vertical communication hole provided in the partition space, The four-stroke vertical internal combustion engine according to claim 1 or 2, wherein a vertical communication hole communicates with the inside of the mount case. In the mount case, a lubricating oil passage for collecting lubricating oil that has lubricated the crankshaft and returning the lubricating oil to the oil pan includes a partition space formed in the mount case, and a return oil hole formed in the bottom of the cut space. The 4-cycle vertical internal combustion engine according to claim 1, 2 or 3, characterized by comprising:

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