JP4057952B2 - Vertical engine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a vertical engine in which a chain mechanism is substantially horizontally stretched between a first shaft and a second shaft that are arranged in a substantially vertical direction.
[0002]
[Prior art]
  In a vertical engine for an outboard motor, a timing chain that transmits the driving force of a crankshaft to a camshaft is housed in a chain cover that covers the cylinder block and cylinder head of the engine. It is known.
[0003]
  In a vertical engine for an outboard motor, a timing chain that transmits the driving force of the crankshaft to the camshaft is disposed between the lower surface of the engine cylinder block and cylinder head and the upper surface of the engine holder that supports the engine. This is known from Patent Document 2 below.
[0004]
[Patent Document 1]
  JP 9-41909 A
[0005]
[Patent Document 2]
  JP 2001-98951 A
[0006]
[Problems to be solved by the invention]
  Generally, in a vertical engine in which the timing chain is arranged in a horizontal plane, the direction in which the oil returning to the oil pan falls due to gravity and the arrangement surface of the timing chain are orthogonal to each other. It becomes difficult to lubricate.
[0007]
  In particular, in Patent Document 1, the timing chain is arranged at the upper part of the engine, but the timing chain lubrication device is not particularly provided. Rather, the breather chamber has only an oil content of about mist. It is not supplied, and there is a concern that the lubrication of the timing chain is insufficient and the durability is lowered. In addition, since the timing chain is arranged in the lower part of the engine in the one described in Patent Document 2, the timing chain can be lubricated with oil falling on the oil pan after lubricating each part of the engine. As described above, the oil does not rotate with the timing chain arranged in the horizontal plane, and it is difficult to make the oil sufficiently contact with the timing chain.
[0008]
  The present invention has been made in view of the above-described circumstances.CrankshaftandBalancer shaftAn object of the present invention is to make it possible to effectively lubricate a chain mechanism that is stretched horizontally.
[0009]
[Means for Solving the Problems]
  In order to achieve the above object, according to the invention described in claim 1,On the engine bodyArranged almost verticallyCrankshaftWhen,Also on the engine bodyArranged in a generally vertical directionCrankshaftDriven byA camshaft and a balancer shaft; a first chain mechanism that extends substantially horizontally across the crankshaft and camshaft; and the crankshaftandBalancer shaftAlmost horizontallySecondWith a chain mechanism,The first chain mechanism includes a cam drive sprocket provided on the crankshaft, a cam driven sprocket provided on the camshaft, and a timing chain wound around the cam drive sprocket and the cam driven sprocket.SaidSecondChain mechanismThe crankshaftProvided inBalancer driven sprocket and balancer driven sprocket formed on the balancer shaft and having a smaller diameter than the cam driven sprocket.And thoseBalancer driven sprocket and balancer driven sprocketWrapped aroundBalancer driveIn a vertical engine composed of a chain,For lubricating the second chain mechanism, which is located outside the portion of the balancer drive chain that is fed out from the balancer driven sprocket and below the second chain mechanism in a plan view.OilFrom belowOil injection part to injectWithOil injection direction from this oil injection partThe balancer driveInclined with respect to the plane formed by the chain trajectoryAnd directed to the inner side of the balancer drive chain just before biting into the balancer driven sprocketA vertical engine is proposed.
[0010]
  According to the above configuration, the vertical engine is generally vertical.Crankshaft and balancer shaftAlmost horizontallySecondWhen lubricating the meshing part of the chain mechanism with oil injected from the oil injection part,The oil injection portion is located outside the portion of the balancer drive chain that is fed out from the balancer driven sprocket in a plan view and below the second chain mechanism.Oil injection directionBut a balancer driveInclined with respect to the plane formed by the chain trajectoryThe balancer just before biting into the balancer driven sprocket -Oriented to the inside of the drive chainSo with the oil injection partSecondEven if there is an obstacle between the meshing part of the chain mechanism, avoid the obstacle.Balancer drive chain just before biting into the balancer driven sprocketIt is possible to inject oil intoSecondThe chain mechanism can be effectively lubricated to increase durability.Moreover, since the oil injection portion is provided outside the travel locus of the balancer drive chain, the oil injection portion can be arranged even when a space cannot be secured inside the travel locus of the chain.
[0011]
  According to the invention described in claim 2, in addition to the configuration of claim 1,Others that inject oil for lubricating the first chain mechanismOil injection partThe timing in plan viewA vertical engine characterized by being arranged inside the running locus of the chain is proposed.
[0012]
  According to the above configuration,Timing in the first chain mechanismInside the chain trajectoryotherSince the oil injection part is provided, the oil injection part can be compactly arranged in a limited space, and the size of the entire vertical engine can be suppressed.
[0013]
  According to the invention described in claim 3, in addition to the configuration of claim 1,CrankshaftandBalancer shaftOn the top side ofThe secondA vertical engine characterized by providing a chain mechanism is proposed.
[0014]
  According to the above configuration, the vertical engine is generally vertical.Crankshaft and balancer shaftHanged almost horizontally on the top edge ofSecondChain mechanismThose shaftsHowever, the oil that leaks from the bearing part of the machine is in a condition where a sufficient lubrication effect cannot be expected, but the durability can be effectively increased by forcibly lubricating the chain mechanism with the oil injected from the oil injection part. it can.
[0015]
  still,FruitExampleThe third oil jet 105 corresponds to the oil injection portion of the invention of claim 1, and the first oil jet 105Oil jet 101In claim 2InventionotherCorresponds to the oil injection part.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
  Embodiments of the present invention will be described below based on the embodiments of the present invention shown in the accompanying drawings.
[0017]
  1 to 23 show an embodiment of the present invention. FIG. 1 is an overall side view of an outboard motor, FIG. 2 is an enlarged sectional view taken along line 2-2 of FIG. 1, and FIG. 3 is an enlarged cross-sectional view of FIG. 4, FIG. 4 is an enlarged view of the four directions of FIG. 2, FIG. 5 is an enlarged view of the five directions of FIG. 4, FIG. FIG. 8 is an enlarged view taken along the line -7 (top view of the mount case), FIG. 8 is an enlarged view taken along the line 8-8 in FIG. 1 (bottom view of the pump body), and FIG. 10 (bottom view of engine subassembly), FIG. 10 is an enlarged view taken along line 10-10 in FIG. 4, FIG. 11 is an enlarged view taken along line 11-11 in FIG. 1, and FIG. 13 is an enlarged sectional view taken along line 13-13 of FIG. 11, FIG. 14 is an enlarged arrow view taken along line 14-14 of FIG. 1, and FIG. 15 is an enlarged arrow view taken along line 15-15 of FIG. Is an enlarged sectional view taken along line 16-16 of FIG. 12, FIG. 12 is an enlarged sectional view taken along line 17-17 in FIG. 12, FIG. 18 is an enlarged sectional view taken along line 18-18 in FIG. 12, FIG. 19 is an enlarged sectional view taken along line 19-19 in FIG. FIG. 21 is an enlarged sectional view taken along line 14-14 of FIG. 11, FIG. 22 is a circuit diagram of an engine cooling system, and FIG. 23 is a circuit diagram of an engine lubricating system.
[0018]
  As shown in FIGS. 1 to 3, the outboard motor O is attached to the hull so as to perform a steering motion in the left-right direction about the steering shaft 96 and a tilt motion in the vertical direction about the tilt shaft 97. The in-line four-cylinder four-stroke water-cooled vertical engine E mounted on the upper portion of the outboard motor O is disposed in a substantially vertical direction with a cylinder block 11 and a lower block 12 coupled to the front surface of the cylinder block 11. The five journals 13 a, 13 a, 13 a, 13 a, 13 a (hereinafter abbreviated as 13 a...) Are coupled to the front side of the lower block 12 and the crankshaft 13 supported so as to be sandwiched between the cylinder block 11 and the lower block 12. A crankcase 14, a cylinder head 15 coupled to the rear surface of the cylinder block 11, and a rear surface of the cylinder head 15. And a head cover 16 engaged. Four pistons 18, 18, 18, which are slidably fitted inside four sleeve-like cylinders 17, 17, 17, 17 (hereinafter abbreviated as 17...) Cast into the cylinder block 11. 18 (hereinafter abbreviated as 18...) Is four crank pins 13 b, 13 b, 13 b, 13 b of the crankshaft 13 via four connecting rods 19, 19, 19, 19 (hereinafter abbreviated as 19...). (Hereinafter abbreviated as 13...).
[0019]
  The cylinder block 11, the lower block 12, the crankcase 14 and the cylinder head 15 constitute an engine subassembly 50 according to the present invention, which is partitioned by the cylinder block 11, the lower block 12 and the crankcase 14 and accommodates the crankshaft 13. The space constitutes the crank chamber 42 of the present invention.
[0020]
  Combustion chambers 20 formed on the cylinder head 15 so as to face the top surfaces of the pistons 18 have an intake port 21 that opens on the left side of the cylinder head 15, that is, on the port side with respect to the traveling direction of the ship. And is connected to an exhaust passage 24 in the engine room via an exhaust port 23 that opens to the right side surface of the cylinder head 15. The intake valve 25 that opens and closes the downstream end of the intake port 21 and the exhaust valve 26 that opens and closes the upstream end of the exhaust port 23 are opened and closed by a DOHC type valve mechanism 27 housed inside the head cover 16. Driven. The upstream side of the intake manifold 22 is connected to a throttle valve 29 fixed to the front surface of the crankcase 14, and intake air that has passed through the silencer 28 is supplied. Injector bases 57 sandwiched between the cylinder head 15 and the intake manifold 22 are provided with injectors 58 for injecting fuel into the intake ports 21.
[0021]
  The internal space of the head cover 16 that houses the valve mechanism 27 is connected to the silencer 28 via a joint 94 and a breather pipe 95, and the blow-by gas that has leaked into the internal space of the head cover 16 is returned to the intake system. In FIG. 2, reference numeral 67 denotes an electrical box that houses electrical components, reference numeral 69 denotes an AC generator, reference numeral 70 denotes a starter motor, and reference numeral 99 denotes a pressure sensor that detects hydraulic pressure. The AC generator 69 is belt-driven by a pulley 68 (see FIG. 13) provided at the upper end of the crankshaft 13.
[0022]
  A timing chain 30 (FIGS. 12, 13, and 21) that transmits the driving force of the crankshaft 13 to the valve operating mechanism 27 is provided on the upper surfaces of the cylinder block 11, the lower block 12, the crankcase 14, and the cylinder head 15 of the vertical engine E. A chain cover 31 for housing the oil pump body 34 is coupled to the lower surface of the cylinder block 11, the lower block 12 and the crankcase 14, and a mount case 35 and oil are coupled to the lower surface of the oil pump body 34. Case 36, extension case 37, and gear case 38 are sequentially coupled.
[0023]
  The oil pump body 34 houses the oil pump 33 between its lower surface and the upper surface of the mount case 35, and a flywheel 32 is disposed between the lower surface of the cylinder block 11 and the like on the opposite side, and the oil pump The flywheel chamber and the oil pump chamber are partitioned by the pump body 34. The oil case 36, the mount case 35, and a part of the lower side of the vertical engine E are covered with a synthetic resin under cover 39, and the upper part of the vertical engine E is joined to the upper surface of the under cover 39. The engine cover 40 is covered.
[0024]
  The drive shaft 41 connected to the lower end of the crankshaft 13 passes through the pump body 34, the mount case 35, and the oil case 36, extends downward in the extension case 37, has a propeller 43 at the rear end, and is attached to the gear case 38. It is connected to the front end of the propeller shaft 44 supported in the front-rear direction via a forward / reverse switching mechanism 45 operated by a shift rod 52. A lower water supply passage 48 extending upward from a strainer 47 provided in the gear case 38 is connected to the cooling water pump 46 provided in the drive shaft 41.
[0025]
  As shown in FIG. 6, a cooling water supply hole 36 a to which the upper end of the upper water supply pipe 49 is connected is formed on the lower surface 36 </ b> L of the oil case 36. A cooling water supply passage 36b connected to the cooling water supply hole 36a is formed on the upper surface 36U of the oil case 36 so as to surround a part of the periphery of the exhaust pipe portion 36c formed integrally with the oil case 36. A cooling water supply passage 35a having the same shape as the cooling water supply passage 36b that opens to the upper surface 36U of the oil case 36 is formed on the lower surface 35L of the mount case 35. A part of the periphery of the exhaust passage 35b that penetrates the mount case 35 is provided. It is formed to surround.
[0026]
  FIG. 7 shows the mount case 35 as viewed from above, and an oil case 36 is coupled to the lower surface thereof. The outer periphery of the exhaust passage 35b is surrounded by a cooling water supply passage 35c and a cooling water discharge passage 35d. More specifically, a cooling water supply passage 35c (see FIG. 6) communicating with a cooling water supply passage 35a formed so as to open downward on the lower surface 35L of the mount case 35 is a cylinder block on the upper surface 35U of the mount case 35. It is formed so as to open upward on the upper surface outside the area of the mounting surface and along the outer periphery of the cylindrical exhaust passage 35b. In the embodiment, a wall 35h continuous with the outer wall of the exhaust passage 35b is divided into three arc-shaped cooling water supply passages 35c. Further, an arc-shaped cooling water drainage passage 35d is formed outside the installation range of the cooling water supply passage 35c on the outer periphery of the cylindrical exhaust passage 35b, and the cooling water supply passage 35c is an outer wall. Are partitioned by walls 35i formed in the.
[0027]
  On the upper surface 35U of the mount case 35, the cooling water supply passage 35e extends in the left-right direction of the outboard motor O across the center of the cylinder 17 in a plan view, and is formed in a U-shaped cross section that opens upward to the upper surface 35U. (See FIG. 6). The cooling water supply passage 35a extends upward and communicates with the cooling water supply passage 35e. The upper surface 35U of the mount case 35 is provided with a relief valve 51 that opens to release the cooling water when the pressure of the cooling water supply passage 35a exceeds a predetermined value (see FIGS. 4 and 7). Further, the joint 116 (see FIG. 7) connected to the cooling water supply passage 35e is connected to the water inspection port 66 (see FIG. 22) via the hose 117.
[0028]
  The cooling water discharge passage 35d is exhausted in the oil case 36, the extension case 37, and the gear case 38 through an opening 36e (see FIG. 7) formed in the entire area of the lower surface 36L of the oil case 36. It communicates with the chamber 63. The gasket 55 sandwiched between the lower surface 35L of the mount case 35 and the upper surface 36U of the oil case 36 is punched through which cooling water falling from the cooling water discharge passage 35d (see FIG. 7) of the mount case 35 passes. Holes 55a, and punching holes 55b that partition a part of the expansion chamber 63 and exhibit a silencing effect are provided (see FIGS. 6 and 7).
[0029]
  Next, the structure of the engine compartment exhaust passage 24 will be described with reference to FIGS. 4 to 6 and FIG. 10.
[0030]
  The exhaust passage means of the vertical engine E is roughly divided into an exhaust passage 24 portion in the engine room and an exhaust chamber portion partitioned from the engine room. The exhaust passage 24 in the engine room is coupled to the right side surface of the cylinder head 15 as will be described later, a single pipe portion 61a for introducing exhaust from each combustion chamber 20, and a collecting portion 61b that gathers in the downstream area thereof. And an exhaust guide 62 connected to the exhaust manifold 61 via a coupling portion 62a and guiding the exhaust to the outside of the engine room.
[0031]
  As is apparent from FIG. 6, the exhaust guide 62 is coupled to the upper surface 35 </ b> U of the mount case 35 that forms the partition wall of the engine room, and communicates with the exhaust passage 35 b that penetrates the mount case 35. The exhaust passage 35 b communicates with the exhaust pipe portion 36 c formed integrally with the oil case 36 and communicates with the exhaust chamber 63. In the embodiment, the oil case 36 constitutes the outer wall portion of the exhaust chamber 63 and the exhaust pipe portion 36c. However, as another configuration, the exhaust pipe portion 36c may be a separate passage. The exhaust passage means may have a structure in which a part of the exhaust passage means is integrally continuous. However, by configuring the exhaust passage 24 in the engine room and the external passage separately, the assembly of each part can be improved. It is possible to ensure sealing performance for the exhaust chamber 63.
[0032]
  The upper part of the exhaust chamber 63 communicates with the outside of the under cover 39 via an exhaust outlet pipe 64 provided in the oil case 36, so that exhaust gas is not discharged into the water during low load operation of the vertical engine E. The exhaust gas is discharged into the atmosphere via the exhaust outlet pipe 64.
[0033]
  Three bolt holes 62c... In a flange 62b formed at the lower end of the exhaust guide 62, three cooling water inlets 62e... Divided in an arc shape surrounding the exhaust passage 62d, and one cooling water outlet 62f. It is formed. When the flange 62b of the exhaust guide 62 is bolted to the mounting seat 35f (see FIG. 7) of the upper surface 35U of the mount case 35, the cooling water inlet 62e of the exhaust guide 62 communicates with the cooling water supply passage 35c of the mount case 35. At the same time, the cooling water outlet 62f communicates with the cooling water discharge passage 35d of the mount case 35. On the lower surface 35L side of the mount case 35 of the mounting seat 35f, the anti-exhaust passage 35b side of the outer wall constituting the cooling water discharge passage 35d remains at a slightly higher position than the gasket surface, and between the lower surface of the outer wall and the gasket surface. Cooling water is drained onto the gasket 55.
[0034]
  The exhaust guide 62 is formed with a first exhaust guide cooling water jacket JM1 that covers the upper circumference of the exhaust passage 62d and a second exhaust guide cooling water jacket JM3 that covers the lower circumference of the exhaust guide 62d. An exhaust manifold cooling water jacket JM2 is formed so as to surround the periphery of the exhaust manifold 61. When the lower end of the exhaust manifold 61 is fitted to the inner periphery of the coupling portion 62a of the exhaust guide 62, the exhaust manifold 61 is cooled. The water jacket JM2 and the first exhaust guide cooling water jacket JM1 of the exhaust guide 62 communicate with each other.
[0035]
  As apparent from FIGS. 4 and 5, two joints 61d and 61e are provided at the upper part of the exhaust manifold cooling water jacket JM2 of the exhaust manifold 61, and the cooling water in the exhaust manifold cooling water jacket JM2 The gas is discharged from the joints 61d and 61e to the exhaust chamber 63 through a pipe (not shown).
[0036]
  Next, the structure of the cooling system of the cylinder block 11 will be described based on FIGS. 3 and 7 to 9.
[0037]
  A slit-shaped cooling water supply passage 34a (see FIG. 8) formed so as to penetrate the pump body 34 is a slit-shaped cooling water supply passage 35e (see FIG. 7) formed so as to penetrate the mount case 35. ), And the cooling water supply passage 11c formed in the lower surface of the cylinder block 11 has the same shape as the cooling water supply passage 35e and extends in the left-right direction so as to straddle the center of the cylinder 17 in the left-right width direction. Communicate with. The cooling water supply passage 11c of the cylinder block 11 has a groove shape with an open bottom surface, and the cylinder block cooling water jacket JB of the cylinder block 11 passes through two through holes 11d and 11e penetrating the upper wall of the groove. It communicates with the lower end.
[0038]
  Next, the structure of the cooling system of the cylinder head 15 will be described based on FIGS. 3, 6, 9 and 13.
[0039]
  Two short cooling water supply passages 11g and 11h are branched from the side wall of the slit-shaped cooling water supply passage 11c formed on the lower surface of the cylinder block 11 toward the cylinder head 15, and the cooling water supply passages 11g and 11h. Communicates with the cylinder head cooling water jacket JH of the cylinder head 15 through the gasket 56 between the cylinder block 11 and the cylinder head 15. The cylinder block cooling water jacket JB surrounding the cylinders 17 of the cylinder block 11 is isolated from the cylinder head cooling water jacket JH of the cylinder head 15 via a gasket 56 interposed between the coupling surfaces of the cylinder block 11 and the cylinder head 15. (See FIGS. 2 and 6).
[0040]
  A first thermostat 85 and a second thermostat 86 are housed in a thermostat mounting seat 31a provided on the chain cover 31 that covers the upper surfaces of the cylinder block 11 and the cylinder head 15, and the cylinder block cooling water jacket JB and the cylinder head cooling water are accommodated. The upper ends of the jackets JH are connected to the first thermostat 85 and the second thermostat 86, respectively. A drain pipe 88 extending from the joint 87a of the thermostat cover 87 covering the thermostat mounting seat 31a is connected to the second exhaust guide cooling water jacket JM3 via a joint 62h (see FIGS. 4 and 5) provided on the exhaust guide 62. The
[0041]
  Next, the structure of the drive system of the camshafts 73 and 73 and the balancer shafts 78 and 79 by the crankshaft 13 will be described with reference to FIGS.
[0042]
  A timing chain 30 comprising a silent chain with less noise is connected to a cam driven sprocket 72 provided at the upper end of the crankshaft 13 and cam driven sprockets 74 provided on a pair of camshafts 73 located at the rear of the cylinder head 15. Is wrapped around. A hydraulic chain tensioner 75 contacts the loose side of the timing chain 30 and a chain guide 76 contacts the opposite side. The number of teeth of the cam drive sprocket 72 is half the number of teeth of the cam driven sprockets 74 and 74, and therefore the camshafts 73 and 73 rotate at half the number of rotations of the crankshaft.
[0043]
  As shown in detail in FIG. 21, the timing chain 30 made of a silent chain has a plurality of plates 30a... Connected endlessly with pins 30b..., And the teeth formed on the plates 30a. The cam driven sprockets 74 and 74 are engaged with each other. The timing chain 30 is guided along a synthetic resin guide portion 76 a provided on the chain guide 76.
[0044]
  A balancer device 77 is housed inside the crankcase 14, and a balancer driven sprocket 80 provided on one of the two balancer shafts 78 and 79 and a balancer drive sprocket 81 provided on the crankshaft 13 are connected by a silent chain. A balancer drive chain 82 is wound around. The chain tensioner 83 contacts the loose side of the balancer drive chain 82, and the chain guide 84 contacts the opposite side. The number of teeth of the balancer drive sprocket 81 is twice the number of teeth of the balancer driven sprocket 80. Therefore, the balancer shafts 78 and 79 rotate at twice the number of rotations of the crankshaft 13.
[0045]
  The cam drive sprocket 72, the cam driven sprocket 74, and the timing chain 30 constitute a first chain mechanism 89, and the balancer drive sprocket 81, the balancer driven sprocket 80, and the balancer drive chain 82 constitute a second chain mechanism 90.
[0046]
  The chain cover 31, the upper part of the crankcase 14, and the upper part of the head cover 16 define a chain chamber 54 in which the first and second chain mechanisms 89 and 90 are housed.
[0047]
  As apparent from FIGS. 12, 14 and 21, two curved first and second ribs 31b and 31c are suspended from the lower surface of the chain cover 31, and the lower surface of the first rib 31b is a cylinder block. 11 and the upper surface of the chain 30 that moves along the chain guide 76 fixed to the upper surface of the cylinder head 15, and the lower surface of the second rib 31 c is provided on the upper surface of the cylinder block 11 and the cylinder head 15. It is arranged close to the upper surface of the chain 30 that moves along the chain tensioner 75.
[0048]
  An arc-shaped third rib 31e is suspended from the lower surface of the chain cover 31 so as to surround a part of the periphery of the opening 31d through which the crankshaft 13 passes, and the first and first ribs are formed at both ends of the third rib 31e. The ends of the two ribs 31b and 31c are connected. Furthermore, an arc-shaped fourth rib 31f hangs down from the lower surface of the chain cover 31 so as to surround a part of the periphery of the opening 31d, and the third and fourth ribs 31e and 31f suspend the outer periphery of the opening 31d. The entire area is surrounded. The lower ends of the first to third ribs 31b, 31c, 31e end at a position higher than the upper end of the timing chain 30, but the lower end of the fourth rib 31f is substantially the same height as the lower end of the timing chain 30, and the chain cover It extends to a position higher than the lowermost packing surface 31.
[0049]
  A detection portion of an engine speed sensor 59 for detecting the rotation speed of the crankshaft 13 is inserted into a gap formed between the opposed end portions of the third and fourth ribs 31e and 31f and fixed to the crankshaft 13. The rotation speed detection rotor 60 faces the outer peripheral surface.
[0050]
  As is apparent from FIGS. 14 and 15, two arc-shaped first and second ribs 11n and 11o protrude upward from the upper surface of the cylinder block 11, and these first and second ribs 11n and 11o are projected upward. Is opposed to the lower surfaces of the third and fourth ribs 31e and 31f of the chain cover 31.
[0051]
  As apparent from FIGS. 11 to 14 and 18, the crankcase 14 covering the balancer device 77 includes a vertical wall 14 a disposed so as to surround a substantially half circumference of the balancer drive sprocket 80 far from the crankshaft 13; An arcuate horizontal wall 14b extending in the horizontal direction so as to face the lower surface of the balancer drive sprocket 80 from the lower end of the vertical wall 14a is provided. The vertical wall 14 a and the horizontal wall 14 b are formed integrally with the crankcase 14 by providing a recess 14 c (see FIG. 11) protruding inward in a part of the crankcase 14.
[0052]
  The head cover 16 that covers the valve mechanism 27 is arranged so as to surround substantially a quarter of the outer circumference of the travel locus of the timing chain 30 on the side far from the crankshaft 13 of the pair of cam driven sprockets 74 and 74. Walls 16b, 16b and arcuate horizontal walls 16c, 16c extending horizontally from the lower ends of the vertical walls 16b, 16b so as to face the lower surfaces of the cam driven sprockets 74, 74 are provided. The vertical walls 16b and 16 and the horizontal walls 16c and 16 are formed integrally with the head cover 16 by providing recesses 16d and 16d (see FIG. 11) protruding inward in a part of the head cover 16.
[0053]
  Next, the structure of the lubrication system of the vertical engine E will be described.
[0054]
  As shown in FIGS. 3, 4, and 6 to 9, the oil case 36 is integrally provided with an oil pan 36 d, and a suction pipe 92 including an oil strainer 91 is accommodated therein. The oil pump 33 is provided with an oil suction passage 33a, an oil discharge passage 33b, and an oil relief passage 33c. The oil suction passage 33a is connected to a suction pipe 92, and the oil discharge passage 33b extends to the back side of the paper surface of FIG. An oil relief passage is connected to each lubricated portion of the vertical engine E from an outlet through an oil passage (not shown) in the mount case 35 and an oil supply hole 11m (see FIG. 9) formed in the lower surface of the cylinder block 11. 33c discharges the return oil from the oil pump 33 into the oil pan 36d.
[0055]
  A part of the return oil from the valve operating mechanism 27 provided inside the cylinder head 15 and the head cover 16 is part of an oil return passage 35g penetrating the joint 16a, the oil hose 93 and the mount case 35 provided in the head cover 16 (FIG. 7). The other part of the return oil from the valve operating mechanism 27 is returned to the oil pan 36d through the oil return passage 15b (see FIGS. 6 and 9) formed in the cylinder head 15, the cylinder block 11 and An oil return passage 11j (see FIG. 9) that opens to the packing surface of the cylinder head 15, an oil return passage 11k that passes through the cylinder block 11 (see FIG. 9), and an oil return passage 34b that passes through the pump body 34 (see FIG. 8). And an oil return passage 35g (see FIG. 7) passing through the mount case 35. It is returned to the 36d. The oil return passage 11j opened in the gasket 56 between the cylinder block 11 and the cylinder head 15 is disposed so as to be sandwiched between the two cooling water supply passages 11g and 11h opened there (see FIG. 3).
[0056]
  The return oil from the crankcase 14 is returned to the oil pan 36d through an oil return passage (not shown) penetrating the pump body 34 and an oil return passage 35g (see FIG. 7) penetrating the mount case 35.
[0057]
  As apparent from FIGS. 3 and 15, two oil return holes 11 p and 11 p distributed to the left and right of the cylinder axis L are formed in the upper wall of the cylinder block 11 covered by the chain cover 31. On the cylinder axis L, a partially cylindrical bulging portion 11q corresponding to the cylinder 17 protrudes upward at the uppermost position, and the other portion is at a lower position than the bulging portion 11q. 11p and 11p open in the low position.
[0058]
  Further, on the cylinder axis L between the two oil return holes 11p, 11p, five journal support walls 11r for supporting the journals 13a of the crankshaft 13 pass through in the axial direction of the crankshaft 13. Are formed, the uppermost oil return hole 11s communicates with the chain chamber 54, and the lowermost oil return hole 11s communicates with the oil pan 36d through the inside of the mount case 35.
[0059]
  As apparent from FIGS. 12, 13, and 16, the timing chain 30 that meshes with the cam drive sprocket 72 provided on the crankshaft 13, and the balancer drive chain 82 that meshes with the balancer drive sprocket 81 provided on the crankshaft 13. A first oil jet 101 is provided on the upper surface of the cylinder block 11 close to the crankshaft 13.
[0060]
  The first oil jet 101 includes a jet main body 101a that fits into an oil jet support hole 11t formed in the cylinder block 11, a nozzle 101b that opens to the top of the jet main body 101a, and an arm that extends laterally from the jet main body 101a. Part 101c and a positioning projection 101d that is formed at the tip of arm 101c and fits into positioning hole 11u of cylinder block 11, and has an outer periphery of jet body 101a that fits into oil jet support hole 11t. A seal member 102 is provided. In order to fix the first oil jet 101 to the cylinder block 11, a pressing protrusion 31g that hangs down from the ceiling surface of the chain cover 31 abuts on the upper surface of the jet main body 101a.
[0061]
  In this way, the first oil jet 101 is fitted into the oil jet support hole 11t of the cylinder block 11, and the pressing protrusion 31g of the chain cover 31 is brought into contact with the upper end of the jet body 101a. The first oil jet 101 can be fixed without the need for a special fixing member, and there is no need to provide a boss having a wall thickness for processing a bolt hole in a narrow space near the crankshaft 13. One oil jet 101 can be easily arranged.
[0062]
  The nozzle 101b of the first oil jet 101 is directed obliquely upward through the space below the third rib 31e that hangs down from the ceiling surface of the chain cover 31. As shown by the arrow A in FIGS. The oil supplied from the jet support hole 11t is injected toward the cam drive sprocket 72 provided in the crankshaft 13.
[0063]
  As apparent from FIGS. 12, 13, and 17, the second oil jet 103 for lubricating the timing chain 30 that meshes with the cam driven sprocket 74 provided on one camshaft 73 is formed on the upper surface of the cylinder head 15. Provided. The second oil jet 103 includes a jet main body 103a that fits in an oil supply passage 15c formed in the cylinder head 15, a nozzle 103b that opens in a substantially horizontal direction above the jet main body 101a, and a lateral side from the jet main body 103a. And is fixed to the cylinder head 15 with a bolt 104 penetrating the arm portion 103c.
[0064]
  As indicated by an arrow B in FIG. 12, the oil injected by the second oil jet 103 in a substantially horizontal direction is located near the upstream end of the chain tensioner 75 at a position where the timing chain 30 is engaged with one cam driven sprocket 74. Oriented.
[0065]
  As is apparent from FIGS. 12 and 18, the third oil jet 105 for lubricating the balancer drive chain 82 that meshes with the balancer driven sprocket 80 provided on one balancer shaft 79 includes:In a plan view, the balancer drive chain 82 is disposed outside the portion extended from the balancer driven sprocket 80 and below the chain 82.It is provided inside the crankcase 14. The third oil jet 105 opens obliquely upward in an oil supply passage 14d formed in the crankcase 14, and as indicated by an arrow C, the oil injected by the third oil jet 105 obliquely upward is a balancer. Balancer drive chain 82 just before biting into driven sprocket 80Inside ofIs oriented.
[0066]
  As apparent from FIG. 3 and FIG. 20, two of the four cylinders 17, which have a generally horizontal cylinder axis L and are juxtaposed in the vertical direction, correspond to the two upper cylinders 17, 17. Four fourth oil jets 118, 118 are provided. Unlike the first to third oil jets 101, 103, and 105, which are mainly used for lubrication, the fourth oil jets 118 and 118 are used for cooling the pistons 18 and 18. When the hydraulic pressure of the main gallery 11x extending in the vertical direction exceeds a predetermined value, the check valves 119 and 119 to which a predetermined set load is applied are opened, so that the two cylinders 17 and 17 are slidably fitted. Oil is jetted in the direction of arrow D toward the back surfaces of the pistons 18 and 18 to be combined.
[0067]
  Next, the structure around the oil filter 106 will be described with reference to FIGS. 3, 5, 19 and 20.
[0068]
  The oil filter 106 having a cylindrical shape as a whole is provided on the right side surface of the cylinder block 11, and is screwed into a circular oil filter mounting seat 108 a of a base member 108 fixed to the cylinder block 11 with five bolts 107. Fixed. Inside the base member 108, an inlet side oil supply passage 108b and an outlet side oil supply passage 108c are formed. The lower end of the inlet side oil supply passage 108b communicates with the oil supply passage 11v of the cylinder block 11 via the seal member 109, and the upper end thereof becomes an annular oil inflow portion 108d and is formed on the outer peripheral portion of the oil filter mounting seat 108a. Open. One end of the outlet-side oil supply passage 108c communicates with an oil outflow portion 108e that opens at the center of the oil filter mounting seat 108a, and the other end from the oil supply passage 11w of the cylinder block 11 via the seal member 110. It communicates with 11x.
[0069]
  As shown in FIGS. 5 and 7, a joint 111 communicating with a cooling water supply source to the relief valve 51 is provided on the upper surface 35 </ b> U of the mount case 35, and a cooling water supply hose 112 extending from the joint 111 is provided. The base member 108 is connected to the joint 113 at the lower end. Further, a cooling water discharge hose 115 extending from a joint 114 provided at the upper end of the base member 108 is connected to a joint 71 provided at an intermediate portion of the drain pipe 88.
[0070]
  A water jacket 108f for connecting the lower joint 113 and the upper joint 114 is provided inside the base member 108. The water jacket 108f is provided with an inlet side oil supply passage 108b and an outlet side oil supply of the base member 108. It arrange | positions so that the circumference | surroundings of the channel | path 108c and the oil-filter mounting seat 108a may be surrounded.
[0071]
  Next, the operation of the embodiment of the present invention having the above configuration will be described.
[0072]
  First, the operation relating to the cooling of the vertical engine E will be described mainly with reference to the cooling water circuit of FIG.
[0073]
  When the drive shaft 41 connected to the crankshaft 13 is rotated by the operation of the vertical engine E, the cooling water pump 46 provided on the drive shaft 41 is operated, and the cooling water sucked up through the strainer 47 is taken into the lower water supply passage 48 and The oil is supplied to the cooling water supply port 36 a on the lower surface of the oil case 36 through the upper water supply pipe 49. The cooling water that has passed through the cooling water supply port 36a flows into the cooling water supply passage 36b of the oil case 36 and the cooling water supply passage 35a of the mount case 35, and a part of the cooling water branched therefrom is an exhaust passage 24 in the engine room. The first exhaust guide cooling water jacket JM1 formed on the exhaust guide 62 and the exhaust manifold cooling water jacket JM2 formed on the exhaust manifold 61 are supplied. The exhaust gas discharged from the combustion chambers 20 of the cylinder head 15 passes through the single pipe portions 61a of the exhaust manifold 61 and the collecting portion 61b, the exhaust passage 62d of the exhaust guide 62, the exhaust passage 35b of the mount case 35, and the oil case 36. Cooling water flowing through the first exhaust guide cooling water jacket JM1 and the exhaust manifold cooling water jacket JM2 through the exhaust passage 24 in the engine room which is discharged to the exhaust chamber 63 through the exhaust pipe portion 36c and becomes high temperature by the exhaust gas at that time. Cool with.
[0074]
  The cooling water whose temperature has risen from the bottom through the first exhaust guide cooling water jacket JM1 and the exhaust manifold cooling water jacket JM2 rises from the joints 61d and 61e provided at the upper end of the exhaust manifold 61 through a pipe (not shown). It is discharged into the exhaust chamber 63.
[0075]
  On the other hand, some of the low-temperature cooling water supplied to the cooling water supply passages 36b and 35a connected to the cooling water supply port 36a has two through holes 11d opened to the cooling water supply passage 11c at the lower end of the cylinder block 11. It flows into the lower end of the cylinder block cooling water jacket JB through 11e. A part of the low-temperature cooling water supplied to the cooling water supply passages 36b and 35a passes through the two cooling water supply passages 11g and 11h from the cooling water supply passage 11c at the lower end of the cylinder block 11, and the cylinder head cooling water jacket. It flows into the lower end of JH.
[0076]
  During the warm-up operation of the vertical engine E, the first thermostat 85 connected to the upper end of the cylinder block cooling water jacket JB and the second thermostat 86 connected to the upper end of the cylinder head cooling water jacket JH are closed, and the cylinder block cooling water is The cooling water in the jacket JB and the cylinder head cooling water jacket JH stays without flowing, and warming of the vertical engine E is promoted. At this time, the cooling water pump 46 continues to rotate, but the cooling water pump 46 is substantially idling due to leakage of cooling water from around the rubber impeller.
[0077]
  When the warm-up operation of the vertical engine E is completed and the temperature of the cooling water rises, the first and second thermostats 85 and 86 are opened, and the cooling water for the cylinder block cooling water jacket JB and the cooling water for the cylinder head cooling water jacket JH are opened. Flows into the second exhaust guide cooling water jacket JM3 from the common joint 87a of the thermostat cover 87 through the drain pipe 88 and the joint 62h of the exhaust guide 62. Then, the cooling water that has cooled the exhaust guide 62 while flowing through the second exhaust guide cooling water jacket JM3 passes through the mount case 35 and the oil case 36 from below to be discharged into the exhaust chamber 63. When the rotational speed of the vertical engine E increases and the internal pressure of the cooling water supply passages 36 b and 35 a exceeds a predetermined value, the relief valve 51 is opened and excess cooling water is discharged into the exhaust chamber 63.
[0078]
  Further, the cooling water branched from the upstream side of the relief valve 51 to the cooling water supply hose 112 flows into the lower end of the water jacket 108f of the base member 108 of the oil filter 106, and enters the inside of the base member 108 while flowing upward there. The oil flowing through the formed inlet side oil supply passage 108b and the outlet side oil supply passage 108c is cooled, and the oil inside the oil filter 106 is cooled via the oil filter mounting seat 108a of the oil filter 106. Then, the cooling water heat-exchanged with the oil is discharged from the upper end of the water jacket 108 f to the intermediate portion of the drain pipe 88 through the cooling water discharge hose 115.
[0079]
  Next, the operation relating to the lubrication of the vertical engine E will be described mainly with reference to the oil circuit of FIG.
[0080]
  The oil in the oil pan 36d is sucked into the oil pump 33 through the oil strainer 91 and the oil suction passage 33a (see FIG. 8), and the oil discharged from the oil pump 33 is mounted on the mount case from the oil discharge passage 33b (see FIG. 8). The oil is supplied to an oil supply hole 11m (see FIG. 9) formed in the lower surface of the cylinder block 11 through an oil passage in the cylinder 35. At that time, surplus oil discharged by the oil pump 33 passes through the relief valve 51 and is returned to the suction side of the oil pump 33. The relief oil may be returned to the oil pan 36d.
[0081]
  Oil supplied to the oil supply passage 11v (see FIG. 3) of the cylinder block 11 is supplied to the oil filter 106 (see FIGS. 19 and 20) from there through the inlet side oil supply passage 108b of the base member 108, and filtered. The subsequent oil is supplied from the outlet side oil supply passage 108c of the base member 108 to the main gallery 11x formed vertically in the cylinder block 11 through the oil supply passage 11w of the cylinder block 11. The oil branched from the main gallery 11x lubricates the journals 13a ... and crank pins 13b ... of the crankshaft 13 and the two balancer shafts 78, 79.
[0082]
  Thus, the inlet side oil supply passage 108b for supplying oil to the oil filter 106 and the outlet side oil supply passage 108c for discharging oil from the oil filter 106 are formed in the base member 108 separate from the cylinder block 11. Therefore, it is not necessary to increase the wall thickness of the cylinder block 11 or form a bulging portion surrounding the oil passage in order to form the inlet side oil supply passage 108b and the outlet side oil supply passage 108c. This can contribute to weight reduction of the block 11. In addition, since the inlet side oil supply passage 108b and the outlet side oil supply passage 108c are formed inside the base member 108, their layout can be freely set without being constrained by the shape of the cylinder block 11, and the design is free. Can contribute to an increase in the degree.
[0083]
  Further, since the water jacket 108f facing the inlet side oil supply passage 108b, the outlet side oil supply passage 108c, and the oil filter mounting seat 108a is formed inside the base member 108 that supports the oil filter 106, the water jacket is provided in the cylinder block 11. Compared to the case, the degree of freedom of the layout of the water jacket 108f can be increased, and the water jacket 108f is supplied with low-temperature cooling water that has not been heated immediately after leaving the cooling water pump 46. The oil can be effectively cooled by the cooling water flowing through the jacket 108f. As a result, the lubrication effect and cooling of lubricated parts such as the sliding parts of the cylinders 17 and the pistons 18, the crankshaft 13, the camshafts 73 and 73, the balancer shafts 78 and 79, the timing chain 30, and the balancer drive chain 82 are achieved. The effect can be enhanced.
[0084]
  The first oil jet 101 (see FIGS. 13 and 16) is connected to the oil jet support hole 11t branched from the oil supply passage connected to the uppermost journal 13a from the main gallery 11x, and the oil supply passage 15c branched from the main gallery 11x. The second oil jet 103 (see FIG. 17) is connected to the second oil jet 103, and the third oil jet 105 (see FIG. 18) is connected to the oil supply passage 14d branched from the main gallery 11x.
[0085]
  The nozzle 101b of the first oil jet 101 injects oil onto a cam drive sprocket 72 provided at the upper end of the crankshaft 13, and lubricates the timing chain 30 wound around the cam drive sprocket 72. The crankshaft 13 is provided with a balancer drive sprocket 81 so as to be positioned directly below the cam drive sprocket 72, and the oil dropped from the cam drive sprocket 72 falls on the balancer drive sprocket 81 and is wound around the balancer. Lubricate the drive chain 82.
[0086]
  In this way, the cam drive sprocket 72 and the balancer drive sprocket 81 are arranged in two upper and lower stages, and the oil is injected toward the upper cam drive sprocket 72, so that the oil that collides with the cam drive sprocket 72 and drops is balanced. By contacting the drive sprocket 81, both the cam drive sprocket 72 and the balancer drive sprocket 81 can be effectively lubricated. At this time, since the diameter of the lower balancer drive sprocket 81 is larger than that of the upper cam drive sprocket 72, the oil dripped from the cam drive sprocket 72 is more effectively brought into contact with the balancer drive sprocket 81 to provide a lubricating effect. Can be increased.
[0087]
  The periphery of the cam drive sprocket 72 to which oil is injected from the first oil jet 101 is surrounded by arc-shaped third ribs 31e and fourth ribs 31f that hang down from the ceiling surface of the chain cover 31. Can be prevented from being scattered unnecessarily, and the lubricating effect of the cam drive sprocket 72 and the balancer drive sprocket 81 can be further enhanced.
[0088]
  The oil injected from the nozzle 103b of the second oil jet 103 is directed to the position where the timing chain 30 is engaged with one cam driven sprocket 74, and this position is larger than the position where the first oil jet 101 is provided. Because of the distant position, the entire region of the timing chain 30 can be evenly lubricated by the cooperation of the first and second oil jets 101 and 103.
[0089]
  Since the first and second ribs 31b and 31c hanging from the ceiling surface of the chain case 31 are arranged close to the upper surface of the timing chain 30, they flow down from the ceiling surface along the first and second ribs 31b and 31c. The oil is positively supplied to the sliding portions between the pins 30b of the timing chain 30 and the holes of the plurality of plates 30a and the sliding portions with the chain guide 76 to perform lubrication. In particular, in the timing chain 30 constituted by a silent chain, the plate 30a... And the sprocket directly mesh with each other, and the driving force of the chain directly acts on the sliding portion between the hole of the plate 30a. As described above, by supplying a sufficient amount of oil through the first and second ribs 31b and 31c to obtain a lubricating effect, wear of the sliding portion can be reduced.
[0090]
  Since the two recesses 16d and 16d of the head cover 16 are provided with horizontal walls 16c and 16c facing the lower surface of the timing chain 30, the falling oil is temporarily stored on the horizontal walls 16c and 16c. The timing chain 30 passing there can be lubricated. In addition, the oil and the timing chain 30 can be guided along the arc-shaped travel locus of the timing chain 30 in cooperation with the vertical walls 16 b and 16 b facing the outer peripheral surface of the timing chain 30. Can be ensured for a long time and over a long distance.
[0091]
  Further, oil that scatters radially outward from the cam driven sprockets 74 and 74 by the centrifugal force is captured by the vertical walls 16b and 16b, and oil that has flowed down along the vertical walls 16b and 16b is held by the horizontal walls 16c and 16c. Therefore, the oil can be effectively brought into contact with the timing chain 30 that circulates along the vertical walls 16b and 16b and the horizontal walls 16c and 16c through a predetermined gap, thereby enhancing the lubrication effect. In addition, since the vertical walls 16b and 16b and the horizontal walls 16c and 16c are integrally formed by providing the recesses 16d and 16d in a part of the head cover 16, there is no possibility that the number of parts increases.
[0092]
  The oil injected from the third oil jet 105 is directed to a position where the balancer drive chain 82 is engaged with the balancer driven sprocket 80, and this position is a position far away from the position where the first oil jet 101 is provided. Therefore, the entire region of the balancer drive chain 82 can be evenly lubricated by the cooperation of the first and third oil jets 101 and 105.
[0093]
  Since the recess 14c of the crankcase 14 is provided with a horizontal wall 14b facing the lower surface of the balancer drive chain 82, the falling oil is temporarily stored on the horizontal wall 14b and the balancer drive chain passing therethrough is stored. 82 can be lubricated. In addition, the oil and the balancer drive chain can be guided along the arc-shaped travel locus of the balancer drive chain 82 in cooperation with the vertical wall 14a facing the outer peripheral surface of the balancer drive chain 82. Contact with 82 can be ensured for a long time and over a long distance.
[0094]
  Furthermore, oil that scatters radially outward from the balancer driven sprocket 80 due to centrifugal force can be captured by the vertical wall 14a, and oil that has flowed down along the vertical wall 14a can be retained by the horizontal wall 14b. In addition, the oil can be effectively brought into contact with the balancer drive chain 82 that circulates along the horizontal wall 14b through a predetermined gap, thereby enhancing the lubrication effect. Moreover, since the vertical wall 14a and the horizontal wall 14b are integrally formed by providing the recess 14c in a part of the crankcase 14, there is no possibility that the number of parts increases.
[0095]
  In the embodiment, the vertical walls 16b, 16b and the horizontal walls 16c, 16c of the head cover 16 are integrally and continuously formed. However, the vertical walls 16b, 16b and the horizontal walls 16c, 16c are formed as separate members from the head cover 16. Then, the head cover 16 may be fixed at an arbitrary position. This is convenient for absorbing errors in assembly when there is a slight gap between the vertical walls 16b and 16b and the horizontal walls 16c and 16c.
[0096]
  Similarly, in the embodiment, the vertical wall 14a and the horizontal wall 11b of the crankcase 14 are formed integrally and continuously. However, the vertical wall 14a and the horizontal wall 14b are formed as separate members from the crankcase 14, and the crankcase. You may fix to 14 arbitrary positions. In this way, when there is a slight gap between the vertical wall 14a and the horizontal wall 14b, it is convenient to absorb assembly errors.
[0097]
  Generally, when the timing chain 30 and the balancer drive chain 82 are arranged on the upper end side of the crankshaft 13, the camshafts 73 and 73, and the balancer shaft 79, only oil leaking from the bearing portions of the shafts 13, 73, 73, and 79 is used. Since a sufficient lubrication effect of the timing chain 30 and the balancer drive chain 82 cannot be expected, there is a concern that the durability thereof is lowered. Therefore, as in this embodiment, oil is injected from the first to third oil jets 101, 103, 105 to the timing chain 30 and the balancer drive chain 82, and the oil scattered on the ceiling surface of the chain case 31 is the first to first oil jets. The four ribs 31b, 31c, 31e and 31f lead to the timing chain 30 and the balancer drive chain 82, and the crankcase 14 and the head cover 16 are provided with vertical walls 14a, 16b and 16c and horizontal walls 14b, 16c and 16c to form oil. By holding this, the lubricating effect of the timing chain 30 and the balancer drive chain 82 can be sufficiently ensured.
[0098]
  Since the first and second oil jets 101 and 103 are disposed on both ends of the timing chain 30 and the first and third oil jets 101 and 105 are disposed on both ends of the balancer drive chain 82, the timing chain 30 and the balancer drive chain 82 can be uniformly sprayed with oil to enhance the lubrication effect.
[0099]
  In particular, by providing the first and second oil jets 101 and 103 inside the travel locus of the timing chain 30, the first and second oil jets 101 and 103 can be easily arranged inside the narrow chain chamber 54. In addition, since the third oil jet 105 is provided outside the travel locus of the balancer drive chain 82, the third oil jet 105 can be arranged without any trouble even when a space cannot be secured inside the travel locus.
[0100]
  Further, the oil injection directions of the first and third oil jets 101 and 105 are inclined with respect to the rotation surfaces of the timing chain 30 and the balancer drive chain 82, so that there is an obstacle and the oil is injected in the horizontal direction. Even if this is not possible, the arrangement of the first and third oil jets 101 and 105 will not be hindered.
[0101]
  If the breather pipe is connected to the chain chamber 54, the oil injected into the chain chamber 54 from the first to third oil jets 101, 103, 105 may clog the breather pipe. In this embodiment, the breather pipe is clogged. Since the pipe 95 (see FIG. 2) is connected to the inside of the head cover 16 isolated from the chain chamber 54, the breather pipe 95 can be prevented from being blocked with oil.
[0102]
  As described above, the first and second chain mechanisms 89 and 90, that is, the cam drive sprocket 72, the cam driven sprockets 74 and 74, the timing chain 30, the balancer drive sprocket 81, the balancer driven sprocket 80, and the balancer drive chain 82 are lubricated. The oil drops through oil return holes 11p, 11p, 11s (see FIGS. 3 and 15) formed on the upper surface of the cylinder block 11, and the oil is the second or lower journal support wall 11r from above the cylinder block 11. Are sequentially passed through the four oil return holes 11s (see FIG. 3) and returned to the oil pan 36d.
[0103]
  As is apparent from FIG. 15, the bulging portion 11q of the uppermost cylinder 17 is raised on the upper surface of the cylinder block 11, and the left and right oil returns to the lowest position closer to the crankshaft 13 than the bulging portion 11q. Since the holes 11p and 11p are formed, the oil on the bulging portion 11q flows so as to be distributed to both sides of the axis L, and is smoothly captured by the oil return holes 11p and 11p and returned to the oil pan 36d.
[0104]
  Note that the uppermost oil return hole 11s disposed on the upper surface of the cylinder block 11 so as to be sandwiched between the left and right oil return holes 11p, 11p is not necessarily required. In this embodiment, the uppermost oil return hole 11s is formed as a secondary when the four oil return holes 11s formed in the second and lower journal support walls 11r are processed. It is.
[0105]
  In the process of returning the oil injected into the chain chamber 54 to the lower oil pan 36d through the oil return holes 11p, 11p, 11s... Provided in the journal support walls 11r. The oil that has passed through 11 s collides with the connecting rod 19 and scatters, and comes into contact with the connecting rod 19, the piston 18, the cylinder 17, etc., so that the piston 18 heated to high temperature by the heat from the combustion chamber 20. It will contribute to the cooling of ... At the same time, the oil scattered by the centrifugal force after lubricating the journals 13a ... of the crankshaft 13 and the crank pins 13b ... also contacts the connecting rods 19 ..., the pistons 18 ..., the cylinders 17 ... etc. from the chain chamber 54. In cooperation with the return oil, it contributes to the cooling of the pistons 18.
[0106]
  Since the amount of oil that cools the pistons 18 increases as it approaches the lower side of the cylinder block 11, the upper pistons 18 are insufficiently cooled, and the lower pistons 18 tend to be excessively cooled. However, in the present embodiment, of the four cylinders 17..., The oil injected from the fourth oil jets 118, 118 provided in the upper two cylinders 17, 17 is separated from the upper two pistons 18, 18. By contacting the back surface and exerting a cooling effect, the four pistons 18 can be uniformly cooled to prevent the occurrence of insufficient cooling or excessive cooling, and the amount of oil necessary for cooling is minimized. To the limit.
[0107]
  As described above, when the back surfaces of the pistons 18 and 18 are cooled by the oil injected from the fourth oil jets 118 and 118, the temperature of the oil easily rises due to the heat taken from the pistons 18 and 18, but in this embodiment, the oil Since the oil cooling effect in the filter 106 is extremely high, an increase in the oil temperature can be reliably suppressed.
[0108]
  Although the embodiments of the present invention have been described above, various design changes can be made without departing from the scope of the present invention.
[0109]
  For example, in the embodiment, the vertical engine E used for the outboard motor O is illustrated, but the present invention can also be applied to a vertical engine E for uses other than the outboard motor O.
[0110]
【The invention's effect】
  As described above, according to the first aspect of the present invention, the vertical engine of the vertical engine is substantially vertical.Crankshaft and balancer shaftAlmost horizontallySecondWhen lubricating the meshing part of the chain mechanism with oil injected from the oil injection part,The oil injection portion is located outside the portion of the balancer drive chain that is fed out from the balancer driven sprocket in a plan view and below the second chain mechanism.Oil injection directionBut a balancer driveInclined with respect to the plane formed by the chain trajectoryIt points to the inner side of the balancer drive chain just before biting into the balancer driven sprocketSo with the oil injection partSecondEven if there is an obstacle between the meshing part of the chain mechanism, avoid the obstacle.Balancer drive chain just before biting into the balancer driven sprocketIt is possible to inject oil intoSecondThe chain mechanism can be effectively lubricated to increase durability.In addition, since the oil injection part is provided outside the travel locus of the balancer drive chain, the oil injection part can be arranged even if a space cannot be secured inside the travel locus of the chain. Can be.
[0111]
  According to the invention described in claim 2,Since the other oil injection part that injects oil for lubricating the first chain mechanism that drives the camshaft is arranged inside the traveling locus of the timing chain in plan view,The oil injection part can be arranged compactly in a limited space and the size of the entire vertical engine can be suppressed..
[0112]
  And claims3The vertical engine of the vertical engineCrankshaft and balancer shaftHanged almost horizontally on the top edge ofSecondChain mechanismThose shaftsHowever, the oil that leaks from the bearing part of the machine is in a condition where a sufficient lubrication effect cannot be expected, but the durability can be effectively increased by forcibly lubricating the chain mechanism with the oil injected from the oil injection part. it can.
[Brief description of the drawings]
[Fig. 1] Overall side view of outboard motor
FIG. 2 is an enlarged sectional view taken along line 2-2 in FIG.
3 is an enlarged sectional view taken along line 3-3 in FIG.
4 is an enlarged view of four directions in FIG.
5 is a view taken in the direction of arrow 5 in FIG.
6 is an enlarged cross-sectional view of the main part of FIG.
7 is an enlarged view taken along line 7-7 in FIG. 1 (top view of the mount case).
8 is an enlarged view taken along line 8-8 in FIG. 1 (bottom view of pump body).
FIG. 9 is an enlarged view taken along line 9-9 in FIG. 1 (bottom view of the engine subassembly).
10 is an enlarged view taken along line 10-10 in FIG.
11 is an enlarged view taken along line 11-11 in FIG.
12 is an enlarged cross-sectional view taken along line 12-12 of FIG.
13 is an enlarged sectional view taken along line 13-13 in FIG.
14 is an enlarged view taken along line 14-14 in FIG.
15 is an enlarged view taken along line 15-15 in FIG.
16 is an enlarged cross-sectional view taken along line 16-16 in FIG.
17 is an enlarged cross-sectional view taken along line 17-17 in FIG.
18 is an enlarged sectional view taken along line 18-18 in FIG.
19 is an enlarged sectional view taken along line 19-19 in FIG.
20 is an enlarged sectional view taken along line 20-20 in FIG.
21 is an enlarged sectional view taken along line 21-21 in FIG.
FIG. 22 is a circuit diagram of an engine cooling system.
FIG. 23 is a circuit diagram of an engine lubrication system.
[Explanation of symbols]
13 CrankshaftG
30 Timing ChainN
72 Cam Drive SprocketG
73 KamshavG
74 Cam-driven sprocketG
79 Balancer ShaffG
80 Balancer driven sprocketG
81 Balancer-driven sprocketG
82 Balancer Driven ChainN
89 First chain machineStructure
90 Second chain machineStructure
101 1st oil jet (otherOil injection part)
105 3rd oil jet (oil injection part)

Claims (3)

A crankshaft (13) arranged in a generally vertical direction;
A camshaft (73) and a balancer shaft (79) , arranged in a generally vertical direction and driven by a crankshaft (13) ;
A first chain mechanism (89) spanned substantially horizontally across the crankshaft (13) and camshaft (73);
A second chain mechanism ( 90 ) suspended substantially horizontally across the crankshaft (13) and the balancer shaft (79) ,
The first chain mechanism (89) includes a cam driven sprocket (72) provided on the crankshaft (13), a cam driven sprocket (74) provided on the camshaft (73), the cam driven sprocket (72), and A timing chain (30) wound around a cam driven sprocket (74),
The second chain mechanism ( 90 ) includes a balancer drive sprocket (81) provided on the crankshaft (13) and a balancer provided on the balancer shaft (79) having a smaller diameter than the cam driven sprocket (74). a driven sprocket (80), the vertical engine constructed out with their balancer drive sprocket (81) and wound around a balancer drive chain balancer driven sprocket (80) (8 2),
In the plan view, the balancer drive chain (82) is located outside the portion extended from the balancer driven sprocket (80) and below the second chain mechanism (90), and the second chain An oil injection part (105) for injecting oil for lubricating the mechanism (90) from below ;
The oil injection direction from the oil injection unit (105) is inclined with respect to the plane formed by the travel locus of the balancer drive chain (82), and the balancer drive immediately before being engaged with the balancer driven sprocket (80). A vertical engine characterized by being directed to the inner side of the chain (82) . Another oil injection part (101) for injecting oil for lubricating the camshaft drive chain mechanism (89) is arranged inside the travel locus of the timing chain (30) in plan view. The vertical engine according to claim 1. The vertical engine according to claim 1, wherein the second chain mechanism ( 90 ) is provided on the upper end side of the crankshaft (13) and the balancer shaft (79 ).

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