CN100564826C

CN100564826C - Water-cooled vertical engine and the outboard motor that is equipped with this water-cooled vertical engine

Info

Publication number: CN100564826C
Application number: CNB2003101002843A
Authority: CN
Inventors: 田和宽基; 吉田裕之
Original assignee: Honda Motor Co Ltd
Current assignee: Honda Motor Co Ltd
Priority date: 2002-10-11
Filing date: 2003-10-10
Publication date: 2009-12-02
Anticipated expiration: 2023-10-10
Also published as: CN101560903B; CN101560905B; CN1497144A; CN101560903A; JP3923406B2; CN101560905A; JP2004132310A

Abstract

A kind of water-cooled vertical engine is provided, and it comprises: bent axle, and this bent axle is arranged vertically substantially; And the timing chain that is used for the driving force of bent axle is passed to camshaft, this timing chain is arranged in the top of cylinder block and head, and the top of timing chain is covered by chain guard.The thermostat of flow that is used for being controlled at the cooling water of the gentle cylinder head cooling water cover of cylinder block cooling jacket is arranged in this chain guard.Therefore can be under the situation of the obstruction that is not subjected to chain at an easy rate from the top of motor near this thermostat, and can operate at an easy rate and be used for water-cooling tube that cooling water is discharged from this thermostat.

Description

Water-cooled vertical engine and the outboard motor that is equipped with this water-cooled vertical engine

Technical field

The present invention relates to a kind of water-cooled vertical engine, it has vertically arranged substantially bent axle; The invention still further relates to a kind of outboard motor that is equipped with water-cooled vertical engine.

Background technique

For the vertical engine that is used for outboard motor, adopt water cooled engine usually.In the flat 10-212948 communique of Japanese Patent Application Laid-Open in disclosed a kind of outboard motor water cooled engine, be used for being arranged in the top of engine body according to the thermostat that the temperature of cooling water is controlled the cooling water flow of water jacket, and Timing Belt is arranged in the top of engine body, and this camshaft is driven by this Timing Belt by bent axle.

The thermostat that is arranged in like this in the engine body top can detect the temperature of the cooling water of supplying with from the bottom of water jacket, and carries out exchange heat, thereby can appropriately control the flow of cooling water.And, because Timing Belt is arranged in the top of engine body, therefore can assemble at an easy rate and keep in repair.

But, in said structure, be used to cover in the cover on Timing Belt top because thermostat is arranged in, therefore such problem arranged, i.e. the maintenance of thermostat need be taken off this cover, but therefore workability is relatively poor.The maintenance of thermostat for convenience, can consider thermostat is arranged in the upper surface of the cover that is used to cover Timing Belt top, but this needs water-cooling tube, and this water-cooling tube is used at this thermostat and is arranged between the water jacket of engine body connection is provided.Thereby cause increasing number of components and installation step.

And, when the thermostat of the cooling water flow that is used for control cylinder body cooling jacket and second thermostat that is used for the cooling water flow of control cylinder lid cooling jacket are provided with respectively, need the confined space that is arranged in motor top with two thermostat compactnesses in.

Summary of the invention

The present invention considers above-mentioned situation, first purpose of the present invention provides a kind of water-cooled vertical engine and is equipped with the outboard motor of this water-cooled vertical engine, wherein, the maintenance that is arranged in the thermostat in the water jacket of engine body can be easy to carry out.

And second purpose of the present invention provides a kind of water-cooled vertical engine and is equipped with the outboard motor of this water-cooled vertical engine, and wherein, cooling water can be easy to supply to thermostat, guarantees to be easy to keep in repair this thermostat simultaneously.

And the 3rd purpose of the present invention is two thermostats are arranged in water-cooled vertical engine compactly or are equipped with in the outboard motor of this water-cooled vertical engine.

In order to realize first purpose of the present invention, a first aspect of the present invention provides a kind of water-cooled vertical engine, and it comprises: bent axle, and this bent axle is arranged vertically substantially; Camshaft; And annular transmission part, be used for the driving force of bent axle is passed to camshaft, thereby being arranged in the top of motor, this annular transmission part rotates along a track; Wherein, this motor also comprises: be formed at water jacket wherein, this water jacket has coolant outlet, and this coolant outlet is to the upper opening of motor and be positioned at the rotary motion trace of described annular transmission part; And thermostat, being used for being controlled at the flow of the cooling water of water jacket, this thermostat is arranged in the top of motor and has the temperature sensing part that is higher than this annular transmission part.

According to this structure, because being used for being controlled at the thermostat of flow of cooling water of the water jacket of motor is arranged in the top of motor and is higher than the annular transmission part that is used for the driving force of bent axle is passed to camshaft, therefore, can be under the situation that not hindered by annular transmission part at an easy rate from the top of motor near this thermostat, and can operate at an easy rate and be used for water-cooling tube that cooling water is discharged from this thermostat.

In order to realize first purpose, according to a second aspect of the invention, except first aspect, a kind of water-cooled vertical engine is provided, wherein, this annular transmission part is a timing chain, and the top of this motor is formed by chain guard, this chain guard covers timing chain, and this chain guard cooperates with cylinder head and cylinder block.

According to this structure, because timing chain is covered by the chain guard that cooperates with cylinder head and cylinder block, camshaft is driven by this timing chain by bent axle, and therefore, timing chain can remain in the lubricant oil environment well.

In order to realize first purpose, a third aspect of the present invention provides a kind of outboard motor that is equipped with water-cooled vertical engine, and it comprises: bent axle, and this bent axle is arranged vertically substantially; Camshaft; And annular transmission part, being used for the driving force of bent axle is passed to camshaft, this annular transmission part is arranged in the top of motor; Wherein, this motor also comprises: be formed at water jacket wherein; Water pump is used for supplying with cooling water to described water jacket; And thermostat, being used for being controlled at the flow of the cooling water of water jacket, this thermostat is arranged in the top of motor and has the temperature sensing part that is higher than this annular transmission part.

According to this structure, because being used for being controlled at the thermostat of flow of cooling water of the water jacket of motor is arranged in the top of motor and is higher than the annular transmission part that is used for the driving force of bent axle is passed to camshaft, therefore, can be under the situation of the obstruction that is not subjected to annular transmission part at an easy rate from the top of motor near this thermostat, and can operate at an easy rate and be used for water-cooling tube that cooling water is discharged from this thermostat.

In order to realize second purpose, according to a forth aspect of the invention, provide a kind of water-cooled vertical engine, it comprises: bent axle, this bent axle is arranged vertically substantially; Camshaft; Engine body; Lid; Annular transmission part shell chamber, this annular transmission part shell chamber is by forming on the upper surface that lid is connected engine body; The annular transmission part is used for the driving force of bent axle is passed to camshaft, and this annular transmission part is arranged in the annular transmission part shell chamber; Wherein, this motor also comprises: be formed at the water jacket in the engine body; And thermostat, being used for being controlled at the flow of the cooling water of water jacket, this thermostat is arranged in the thermostat fitting seat, and the position of this thermostat fitting seat above described annular transmission part is formed on the lid; Cooling water passage is used for providing connection between water jacket and thermostat, and this cooling water passage and this lid are integrally formed.

According to this structure, because being used for being controlled at the thermostat of the flow of the cooling water in the water jacket that is formed at engine body is arranged in the lid, this lid cooperates the annular transmission part shell chamber of formation with engine body, and water jacket and thermostat communicate with each other by the cooling water passage that is formed in this lid, therefore, the maintenance of thermostat not only can be carried out at an easy rate from the motor top, and the special-purpose water-cooling tube that is used between water jacket and thermostat, providing connection can be omitted.

In order to realize second purpose, according to a fifth aspect of the invention, except fourth aspect, provide a kind of water-cooled vertical engine, wherein, be used for discharging the waste pipe of cooling water by forming with this lid separated components from thermostat.

According to this structure,, so be easy to operate water-cooling tube because the waste pipe that is used for discharging cooling water from thermostat is by forming with this lid separated components.

In order to realize second purpose, according to a sixth aspect of the invention, provide a kind of outboard motor that is equipped with water-cooled vertical engine, it comprises: bent axle, this bent axle is arranged vertically substantially; Camshaft; Engine body; Lid; Annular transmission part shell chamber, this annular transmission part shell chamber is by forming on the upper surface that lid is connected engine body; The annular transmission part is used for the driving force of bent axle is passed to camshaft, and this annular transmission part is arranged in the annular transmission part shell chamber; Wherein, this motor also comprises: be formed at the water jacket in the engine body; Water pump is used for supplying with cooling water to described water jacket; And thermostat, being used for being controlled at the flow of the cooling water of water jacket, this thermostat arranges that the position of this thermostat fitting seat above described annular transmission part is formed on the lid in thermostat fitting seat; Cooling water passage is used for providing connection between water jacket and thermostat, and this cooling water passage and this lid are integrally formed.

In order to realize the 3rd purpose, according to a seventh aspect of the invention, provide a kind of water-cooled vertical engine, it comprises: bent axle, this bent axle is arranged vertically substantially; First thermostat is used for being controlled at the flow of the cooling water in the cylinder block cooling jacket that is formed at cylinder block; And second thermostat, be used for being controlled at the flow of the cooling water in the cylinder head cooling jacket that is formed at cylinder head; Wherein, cylinder block cooling jacket coolant outlet that links to each other with first thermostat and the cylinder head cooling jacket coolant outlet that links to each other with second thermostat are closer to each other, and the parts that are used to form the thermostat chamber link to each other with the cylinder block and head with two coolant outlets, and this first and second thermostat is housed in this thermostat chamber.

According to this structure, because being used to form the parts of thermostat chamber links to each other with cylinder block and head, so that cover the cylinder block cooling jacket coolant outlet and the cylinder head cooling jacket coolant outlet of layout close to each other, second thermostat that this thermostat chamber is equipped with first thermostat of the cooling water flow that is used for being controlled at the cylinder block cooling jacket and is used for being controlled at the cooling water flow of cylinder head cooling jacket, therefore first and second thermostats can compact Layout, thereby reduces installing space.

In order to realize the 3rd purpose, according to an eighth aspect of the invention, except the 7th aspect, a kind of water-cooled vertical engine is provided, wherein, be used for the top that annular transmission part that driving force with bent axle passes to camshaft is arranged in engine body, first and second thermostats are arranged in the inside of this annular transmission part.

According to this structure, because thermostat is arranged in the inside of annular transmission part, this annular transmission part is used for the driving force of bent axle is passed to camshaft, and on the top of engine body, therefore, this annular transmission part volume inside can be effective to arrange compactly first and second thermostats.

In order to realize the third aspect, according to a ninth aspect of the invention, except the 7th aspect, provide a kind of water-cooled vertical engine, bent axle, first and second thermostats have public cooling water water drainage part.

According to this structure, because public cooling water water drainage part is used for first and second thermostats, therefore, the number that is used to discharge the pipe of cooling water can be reduced to one, thereby reduces part count.

In order to realize the 3rd purpose, according to the tenth aspect of the invention, provide a kind of outboard motor that is equipped with water-cooled vertical engine, it comprises: bent axle, this bent axle is arranged vertically substantially; First thermostat is used for being controlled at the flow of the cooling water in the cylinder block cooling jacket that is formed at cylinder block; And second thermostat, be used for being controlled at the flow of the cooling water in the cylinder head cooling jacket that is formed at cylinder head; Wherein, cylinder block cooling jacket coolant outlet that links to each other with first thermostat and the cylinder head cooling jacket coolant outlet that links to each other with second thermostat are closer to each other, and the parts that are used to form the thermostat chamber link to each other with the cylinder block and head with two coolant outlets, and this first and second thermostat is housed in this thermostat chamber.

Embodiment's cylinder block 11 and cylinder head 15 are corresponding to engine body of the present invention, embodiment's

cooling water passage

11i and 15a are corresponding to coolant outlet of the present invention, embodiment's timing chain 30 is corresponding to annular transmission part of the present invention, embodiment's chain guard 31 is corresponding to lid of the present invention or be used to form the parts of thermostat chamber, embodiment's first and

second thermostats

84 and 85 are corresponding to thermoregulator of the present invention, the gentle cylinder head cooling water cover of embodiment's cylinder block cooling jacket JB JH is corresponding to water jacket of the present invention, and embodiment's pipe joint 87a is corresponding to cooling water water drainage part of the present invention.And embodiment's chain guard 31 forms the parts of motor E.

Can know above-mentioned purpose of the present invention, other purpose, feature and advantage by description of a preferred embodiment, the preferred embodiment will describe in detail below with reference to the accompanying drawings.

Description of drawings

Fig. 1 to Figure 19 has represented one embodiment of the present of invention.

Fig. 1 is the overall side view of outboard motor.

Fig. 2 is the amplification view along the line 2-2 among Fig. 1.

Fig. 3 is the amplification view along the line 3-3 among Fig. 2.

Fig. 4 is the enlarged view along the arrow among Fig. 24.

Fig. 5 is the view along the arrow among Fig. 45.

Fig. 6 is the amplification view of the major component among Fig. 1.

Fig. 7 is along the enlarged view of the line 7-7 among Fig. 1 (plan view of housing is installed).

Fig. 8 is along the enlarged view of the line 8-8 among Fig. 1 (worm's eye view of the pump housing).

Fig. 9 is along the enlarged view of the line 9-9 among Fig. 1 (worm's eye views of the sub-component of cylinder block etc.).

Figure 10 is the enlarged view of gas exhaust manifold.

Figure 11 is the enlarged view of the connection between gas exhaust manifold and exhaust guide.

Figure 12 is along the view of the arrow line 12-12 among Figure 11 (planimetric map of exhaust guide).

Figure 13 is the sectional view along the line 13-13 among Figure 11.

Figure 14 is the enlarged view along the arrow line 14-14 among Fig. 1.

Figure 15 is the enlarged view along the arrow line 15-15 among Fig. 1.

Figure 16 is the amplification view along the line 16-16 among Figure 15.

Figure 17 is the amplification view along the line 17-17 among Figure 16.

Figure 18 is the sectional view along the line 18-18 among Figure 16.

Figure 19 is the circuti diagram of engine-cooling system.

Embodiment

As shown in Figures 1 to 3, outboard motor O is installed on the hull, like this, can carry out divertical motion to axle 96 along rotating left with to right, and can vertically carry out banking motion around sloping shaft 97.The in-line arrangement four-cylinder four-stroke water-cooled vertical engine E that is installed in outboard motor O top comprises: cylinder block 11; Base (lower block) 12, this base 12 links to each other with the front surface of cylinder block 11; Bent axle 13, this bent axle 13 is arranged along vertical substantially direction, and supporting is for remaining between cylinder block 11 and the base 12 axle journal 13a; Crank box 14, this crank box 14 links to each other with the front surface of base 12; Cylinder head 15, this cylinder head 15 links to each other with the rear surface of cylinder block 11; And end cap 16, this end cap 16 links to each other with the rear surface of cylinder head 15.The cylinder 17 of four form of sleeve is around being cast in the cylinder block 11, and piston 18 is slidably mounted in the cylinder 17, and links to each other with the crank pin 13b of bent axle 13 by connecting rod 19.

Firing chamber 20 is formed in the cylinder head 15, so that top surface facing to piston 18, and this firing chamber links to each other with induction mnifold 22 by intakeport 21, and link to each other with engine nacelle exhaust passage 24 by relief opening 23, this intakeport 21 is opened on the left-hand side surface of cylinder head 15, just when towards traffic direction, be opened on the left side of ship, and relief opening 23 is opened on the right-hand side of cylinder head 15.The Aspirating valves 25 and being used to that is used to open and close the downstream of intakeport 21 opens and closes the outlet valve 26 of the upstream extremity of relief opening 23 and makes like this, can open and close by the DOHC type valve operating gears 27 that are loaded in the end cap 16.The upstream side of induction mnifold 22 links to each other with throttle valve 29, and this throttle valve 29 is arranged in the front portion of crank box 14, and is fixed on the front surface of this crank box, sucks air and is fed into induction mnifold 22 by baffler 28.Sparger pedestal 57 remains between cylinder head 15 and the induction mnifold 22, and the sparger 58 that is used for fuel is injected intakeport 21 is arranged in this sparger pedestal 57.

Chain guard 31 links to each other (seeing Figure 15) with cylinder block 11, base 12, crank box 14 and the upper surface of cylinder head 15 of motor E, and this chain guard 31 is equipped with timing chain 30 (seeing Figure 14), is used for the driving force of bent axle 13 is passed to valve operating gear 27.The lubricating oil pump housing 34 links to each other with cylinder block 11, base 12 and the bottom surface of crank box 14.Housing 35, oil tank 36, extensional shell 37 and gear-box 38 orders are installed to link to each other with the bottom surface of the lubricating oil pump housing 34.

The lubricating oil pump housing 34 has lubricating oil pump 33, this lubricating oil pump 33 is loaded on the bottom surface of the lubricating oil pump housing 34 and installs between the upper surface of housing 35, and this lubricating oil pump housing 34 has flywheel 32 etc. at opposite side, and this flywheel 32 is arranged between the bottom surface of this lubricating oil pump housing 34 and cylinder block 11.The lubricating oil pump housing 34 has been determined flywheel chamber and lubricating oil pump chamber.Parts all use synthetic resin bottom 39 to cover around the bottom side of oil tank 36, installation housing 35 and motor E, and the top of motor E covers with synthetic resin hood 40, and this hood 40 links to each other with the upper surface of bottom 39.

Live axle 41 links to each other with the bottom of bent axle 13, pass the pump housing 34, housing 35 and oil tank 36 extensions are installed, stretch into downwards in the extensional shell 37, and by forward/backward operation switching mechanism 45 and link to each other with the front end of screw shaft 44, this screw shaft 44 has propeller cavitation 43 in its back-end, and along the longitudinal direction by gear-box 38 supportings, this forward/backward operation switching mechanism 45 is operated by cocking lever 52.Cooling waterpump 46 is arranged on the live axle 41, and links to each other with bottom water channel 48, and the filter screen of this bottom water channel 48 from be arranged in gear-box 38 extends upward.Top water pipe 49 extends upward from cooling waterpump 46, and links to each other with cooling water passage 36b (see figure 6) in being arranged in oil tank 36.

As shown in Figure 6, cooling water supply hole 36a is formed among the bottom surface 36L of oil tank 36, and links to each other with the upper end of top water pipe 49.The cooling water passage 36b that is communicated with this cooling water supply hole 36a is formed among the upper surface 36U of oil tank 36, so that around forming the part of the outlet pipe part 36c of one with oil tank 36.Cooling water passage 35a forms around a part of passing the exhaust passage 35b that housing 35 extensions are installed, the shape of this cooling water passage 35a is identical with the shape of cooling water passage 36b in the upper surface 36U of oil tank 36, and the upper surface 36U of this oil tank 36 links to each other with the bottom surface 35L that housing 35 is installed.

Fig. 7 is the view that housing 35 is installed when seeing from above.Oil tank 36 links to each other with the bottom surface of this installation housing 35.The periphery of exhaust passage 35b by cooling water supply passage 35c and cooling water discharge route 35d around.Detailed says, cooling water passage 35a forms and is opened on downwards on the bottom surface 35L that housing 35 is installed, and the cooling water supply passage 35c (see figure 6) that is communicated with this cooling water passage 35a forms upward opening on the upper surface 35U that housing 35 is installed and in the zone in the cylinder block installation surface outside, and extends along the periphery of cylindricality exhaust passage 35b.In the present embodiment, three cooling water supply passage 35c are arranged, these three cooling water supply passage 35c cambers, and the wall 35h that links to each other by outer wall and separated from one another with exhaust passage 35b.And, for a cooling water discharge route 35d of arc is formed in the perimeter in the zone that is furnished with cooling water supply passage 35c around the periphery of cylindricality exhaust passage 35b, this cooling water discharge route 35d is determined by the wall 35i of the outer wall that forms cooling water supply passage 35c.

Cooling water supply passage 35e is formed in the upper surface 35U that housing 35 is installed, and for having the channel shape of U-shaped cross-section, this cooling water supply passage 35e upward opening is on upper surface 35U, and extend along the left and right directions of outboard motor O, so that the center (see figure 6) of bridge joint cylinder 17 in planimetric map, the upper surface 35U that housing 35 is installed links to each other with the cylinder block sub-component that comprises the lubricating oil pump housing 34, and this will introduce in the back.Above-mentioned cooling water passage 35a extends upward, and is communicated with cooling water passage 35e.The upper surface 35U that housing 35 is installed is provided with relief valve 51, when the pressure of cooling water passage 35a reaches predetermined value or when higher, this relief valve 51 will be opened, so that discharge cooling water (seeing Fig. 4 and 7).

Opening 36e (see figure 7) on the whole zone of the upper surface 36U of cooling water discharge route 35d by being formed on oil tank 36 and being communicated with exhaust chamber 63, this exhaust chamber 63 is formed in oil tank 36, extensional shell 37 and the gear-box 38.Packing ring is clipped between the upper surface 36U of bottom surface 35L that housing 35 is installed and oil tank 36.In this packing ring 55, be provided with punching hole 55a and punching hole 55b, will be from the cooling water that the cooling water discharge route 35d (see figure 7) that housing 35 is installed is dripped by punching hole 55a, and punching hole 55b has determined the part of exhaust chamber 63, and erasure effect (seeing Fig. 6 and 7) is arranged.

Introduce the structure of engine nacelle exhaust passage 24 below with reference to Fig. 4 to 6 and Figure 10 to 13.

The exhaust chamber part that gas-exhausting-channel device roughly is divided into engine nacelle exhaust passage 24 parts and separates with this engine nacelle.Engine nacelle exhaust passage 24 is connected with the right flank of cylinder head 15, and is as described below, and comprises gas exhaust manifold 61 and exhaust guide 62, and this exhaust guide 62 links to each other with this gas exhaust manifold 61, and direct exhaust is left engine nacelle.Gas exhaust manifold 61 comprises: single tube part 61a is used for 20 direct exhaust from each firing chamber; And built-up section 61b, this built-up section 61b is at the downstream area of these single tube parts 61a.

Clearly visible by Fig. 6, exhaust guide 62 links to each other with the upper surface 35U that housing 35 is installed, and it forms the engine nacelle divider, and is communicated with the exhaust passage 35b that passes 35 extensions of installation housing.Exhaust passage 35b is communicated with outlet pipe part 36c, and is communicated with exhaust chamber 63, and this outlet pipe part 36c and oil tank 36 form one.In the present embodiment, oil tank 36 forms the outer wall section of exhaust chamber 63, and also forms outlet pipe part 36c, and in another structure, outlet pipe part 36c can form the passage of separation.Gas-exhausting-channel device can be arranged to make its parts to link into an integrated entity, but also can make engine nacelle exhaust passage 24 and its external channel separate formation, thus the seal feature of easier assembling each several part and maintenance exhaust chamber 63.

The top of exhaust chamber 63 by be arranged in the oil tank 36 exhaust exit pipe 64 and with the external communications of bottom 39, like this, as motor E during with low load operation, exhaust is discharged in the atmosphere by exhaust exit pipe 64, rather than is discharged in the water.

Gas exhaust manifold 61 has: four single tube part 61a, and these four single tube part 61a link to each other with four relief openings 23; And built-up section 61b, at this built-up section 61b place, single tube part 61a is combined into together.The major part of built-up section 61b closely contacts with the side surface of cylinder head 15, but crooked near the bottom part of this built-up section 61b, like this, and the side surface separating distance α (see figure 10) of its center line and cylinder head 15.Exhaust guide 62 bends to S shape, and the periphery of the bottom of gas exhaust manifold 61 is packed into interior week than major diameter attachment portion 62a of exhaust guide 62 upper ends by pair of

O shape ring

53 and 54.

Like this, have only the bottom part vicinity bending of gas exhaust manifold 61 to leave the side surface of cylinder head 15, and all the other upper half part of gas exhaust manifold 61 connect into along the side surface of cylinder head 15.Therefore, can prevent to interfere, be used in the space of arranging engine nacelle exhaust passage 24 simultaneously and reduce to minimum than major diameter attachment portion 62a and cylinder head 15.Particularly,, therefore can prevent from the blast air from a plurality of firing chambers 20 of vertically arranging is produced influence of unbalance, thereby make the reduction of exhaust efficiency reduce to minimum because the curved section of gas exhaust manifold 61 is lower than minimum firing chamber 20.

And, because the attachment portion 62a of gas exhaust manifold 61 and exhaust guide 62 has such structure, be that they are installed together by

O shape ring

53 and 54, therefore, can not only make and connect the simple to operate of gas exhaust manifold 61 and exhaust guide 62, and engine nacelle exhaust passage 24 size error vertically can be absorbed by this attachment portion 62a, thereby easier assembling.And, because the bottom part of the upper end part of the first exhaust guide cooling jacket JM1 and exhaust manifold cooling water jacket JM2 is arranged near the

O shape ring

53 and 54, can prevent that therefore

O shape ring

53 and 54 is impaired owing to be heated.

Exhaust guide 62 has the flange 62b at the place, bottom that is formed on it.Three bolt hole 62c, three cooling water intake 62e and a coolant outlet 62f are formed in this flange, and these three cooling water intake 62e are arc, and around exhaust passage 62d.When the flange 62b of exhaust guide 62 bolt is connected on the fitting seat 35f (see figure 7) on the upper surface 35U that housing 35 is installed, the cooling water intake 62e of exhaust guide 62 is communicated with the cooling water supply passage 35c that housing 35 is installed, and coolant outlet 62f is communicated with the cooling water discharge route 35d that housing 35 is installed.With respect to the bottom surface 35L that housing 35 fitting seat 35f are installed, in the outer wall that forms cooling water discharge route 35d, the sidepiece relative with discharge route 35b remains on the position higher a little than washer face, and cooling water is by being discharged on the packing ring 55 in the gap between outer wall bottom surface and the washer face.

The first exhaust guide cooling jacket JM1 and the second exhaust guide cooling jacket JM3 around exhaust passage 62d are formed in the exhaust guide 62.The first exhaust guide cooling jacket JM1 covers half periphery of upper surface side, and the second exhaust guide cooling jacket JM3 covers half periphery of bottom surface side.The first exhaust guide cooling jacket JM1 protrudes in the office, upper end portion of exhaust guide 62 along a circumferential part, so that form projection 62g.

Exhaust manifold cooling water jacket JM2 forms around gas exhaust manifold 61, forms the through hole 61c along extending circumferentially in the bottom of exhaust manifold cooling water jacket JM2.Therefore, when the bottom of gas exhaust manifold 61 is packed in the interior circumferential portion of attachment portion 62a of exhaust guide 62, through hole 61c and the projection 62g of exhaust guide 62 communicate with each other (see Figure 13) of the first exhaust guide cooling jacket JM1 of the exhaust manifold cooling water jacket JM2 of gas exhaust manifold 61 and exhaust guide 62 by gas exhaust manifold 61.

By Figure 4 and 5 clear shown in, in the top of exhaust manifold cooling water jacket JM2, be provided be used for a part of cooling water distribute to cylinder block 11 pipe joint 61d, be used for the cooling-water temperature sensor 67 that a part of cooling water supplied to the pipe joint 61e of water inspection outlet (water check outlet) 66 (see figure 2)s and is used to detect the temperature of cooling water by flexible pipe 65.

Introduce the structure of the cooling water system of cylinder block 11 below with reference to Fig. 3 to 5.

Cooling water is exhaust passage, cooled engine cabin 24 when the exhaust manifold cooling water jacket JM2 of first exhaust guide cooling jacket JM1 that passes through exhaust guide 62 and gas exhaust manifold 61, its temperature raises afterwards, pipe joint 61d from the exhaust manifold cooling water jacket JM2 upper end that is arranged in gas exhaust manifold 61 supplies to T shape tee union or branch components 69 to this cooling water by water pipe 68, and is branched off in two water pipes 70 and 71.Cylinder block cooling jacket JB around four cylinders 17 is formed in the cylinder block 11.Pipe joint 11a and 11b are arranged in position near cylinder block cooling jacket JB upper end (sidepiece in the second high firing chamber 20) and near the position (sidepiece in minimum firing chamber 20) of cylinder block cooling jacket JB bottom.Be connected with pipe joint 11a at the water pipe 70 of upside, and be connected with pipe joint 11b in the bottom side at the water pipe 71 of bottom side at upside.Like this, because the gentle cylinder block cooling water of exhaust manifold cooling water jacket JM2 cover JB is connected with 71 by

water pipe

68,70, is formed on cylinder block 11 with the cooling water supply passage and compares with the situation in the cylinder head 15, machining is easier.

Form and pass slit shape cooling water passage 34a (see figure 8) that the pump housing 34 extends and pass the slit shape cooling water passage 35e (see figure 7) that housing 35 extensions are installed and be communicated with forming, cooling water passage 34a also is communicated with cooling water passage 11c (see figure 9) in the bottom surface that is formed on cylinder block 11, this cooling water passage 11c has the matching surface shape identical with cooling water passage 35e, and along the left and right directions extension, so that bridge joint cylinder 17 is along the middle part of left and right sides width direction.Shown in Fig. 3 and 9, the cooling water passage 11c of cylinder block 11 has the channel shape under shed, and two through hole 11d that extend by the upper wall that passes this conduit and 11e and be communicated with the bottom of the cylinder block cooling jacket JB of cylinder block 11.

As clearly shown in Figure 3, after flowing through the cylinder block cooling jacket JB of cylinder block 11, cooling water supplies to the back with the thermostat of introducing by the cooling water passage 11f in the upper left that is formed on cylinder block 11.

Introduce the structure of the cooling system of cylinder head 15 below with reference to Fig. 3,6 and 9.

The sidewall of the cooling water passage 11g of two weak points and the 11h slit shape cooling water passage 11c from be formed on cylinder block 11 bottom surfaces is towards cylinder head 15 branches.These cooling

water passages

11g and 11h are communicated with the cylinder head cooling jacket JH of cylinder head 15 by being arranged in the packing ring 56 between cylinder block 11 and the cylinder head 15.Cylinder block cooling jacket JB around the cylinder 17 of cylinder block 11 isolates (seeing Fig. 2 and 6) by the packing ring 56 between the matching surface that is arranged in cylinder block 11 and cylinder head 15 with the cylinder head cooling jacket JH of cylinder head 15.

Below introduction is arranged in the thermostat in the cooling water recirculation system.

As shown in figure 14, timing chain 30 is wrapped on the cam drive sprocket wheel 72 that is arranged in bent axle 13 upper ends and is wrapped on the cam driven sprocket 75, and this cam driven sprocket 75 is arranged on the pair of

cams axle

73 and 74 that is positioned at cylinder head 15 rear portions.Hydraulic chain adjuster 76a is against the slack-side of timing chain 30, and chain guide 76b is against the opposite side of timing chain 30.The number of teeth of cam drive sprocket wheel 72 is half of the number of teeth of cam driven sprocket 75, and therefore,

camshaft

73 and 74 rotating speed are half of rotating speed of bent axle 13.

Balace weight 77 is loaded in the crank box 14.Ring chain 82 is wrapped on the balace weight driving sprocket wheel 81 that is arranged on the bent axle 13 and is wrapped on the balace weight driven sprocket 80, and this balace weight driven sprocket 80 is arranged in two

balace weight axles

78 and 79 of balace weight 77 one.Chain tensioning device 83a is against the slack-side of this ring chain 82, and chain guide 83b is against the opposite side of this ring chain 82.The number of teeth of balace weight driving sprocket wheel 81 is twices of the number of teeth of balace weight driven sprocket 80, and therefore,

balace weight axle

78 and 79 rotating speed are the twices of the rotating speed of bent axle 13.

Shown in Figure 15 to 18 was clear, the upper surface of cylinder block 11 and cylinder head 15 was covered by chain guard 31, and timing chain 30 is loaded in this chain guard 31.For lubricated this timing chain 30, at the chain guard 31 inner lubricating oil environment that keep.Thermostat fitting seat 31a is formed on the chain guard 31, so that the matching surface of bridge joint cylinder block 11 and cylinder head 15.The bottom surface of thermostat fitting seat 31a is against the upper surface of cylinder block 11 and cylinder head 15, and upper surface becomes the stepped upper surface that is higher than the main body of chain guard 31.The engine rotation speed sensor 59 that is used to detect the rotating speed of bent axle 13 is arranged in chain guard 31 (seeing Figure 15).

Cooling

water passage

31b and 31c and cooling

water passage

31d and 31e are formed among the thermostat fitting seat 31a of chain guard 31, this cooling

water passage

31b and 31c are communicated with to the cooling water passage 11f of top set with cylinder block cooling jacket JB from cylinder block 11, and cooling

water passage

31d and 31e are communicated with cooling water passage 15a from the cylinder head cooling jacket JH branch of cylinder head 15.First thermostat 84 in cylinder block 11 sides is installed among the cooling water passage 31c, is installed among the cooling water passage 31e at second thermostat 85 of cylinder head 15 sides.First thermostat 84 of valve body 84a is arranged and have second thermostat 85 of valve body 85a to be loaded on respectively in

thermostat chamber

94 and 95, and cover by the public thermostat lid 87 on the upper surface that is fixed on thermostat fitting seat 31a by three bolts 86.Be arranged in pipe joint 87a on the thermostat lid 87 by waste pipe 88 and be arranged in the pipe joint 62h on the exhaust guide 62 and link to each other with the second exhaust guide cooling jacket JM3.

Cooling-water temperature sensor 89 is arranged among the cooling water passage 31e of chain guard 31, and this cooling water passage 31e is facing to second thermostat in cylinder head cooling jacket JH side.

As mentioned above, combustion gas in firing chamber 20 is cut off by Aspirating valves 25, outlet valve 26 is first thermals source, flowing to outside exhaust by engine nacelle exhaust passage 24 is second thermal source, the gentle cylinder block cooling water cover of cylinder head cooling jacket JH JB is corresponding to first cooling unit that is used to cool off first thermal source, and the first exhaust guide cooling jacket JM1 and exhaust manifold cooling water jacket JM2 be corresponding to second cooling unit, it with the first cooling unit heat-shift after cooling second thermal source.

Introduce the structure of the lubrication system of motor E below with reference to Fig. 3,4 and 6 to 9.

Oil tank 36 is provided with all-in-one-piece lubricating oil dish 36d, and the suction pipe 92 with lubricating oil filter screen 91 is loaded among this lubricating oil dish 36d.In oil pump 33, be provided with lubricating oil suction passage 33a, lubricating oil discharge route 33b and lubricating oil release channel 33c.Lubricating oil suction passage 33a links to each other with suction pipe 92.Lubricating oil discharge route 33b links to each other with the motor E each several part that will lubricate by the lubricating oil supply hole 11m (see figure 9) in the bottom surface that is formed on cylinder block 11.Lubricating oil release channel 33c is discharged to the lubricating oil dish 36d lubricating oil that returns from oil pump 33.

The valve operating gear 27 of part lubricating oil from be arranged in cylinder head 15 and end cap 16 returns, and this part lubricating oil is by being arranged in pipe joint 16a, the lubricating oil flexible pipe 93 on the end cap 16 and passing the lubricating oil return passage 35g (see figure 7) that housing 35 extensions are installed and return lubricating oil dish 36d.Another part lubricating oil that returns from valve operating gear 27 is by being formed on lubricating oil return passage 15b (see figure 9) the cylinder head 15, being opened on lubricating oil return passage 11j (see figure 9) on the washer face of cylinder block 11 and cylinder head 15, passing lubricating oil return passage 11k (see figure 9) that cylinder block 11 extends, passing the lubricating oil return passage 34b (see figure 8) that the pump housing 34 extends and pass and the lubricating oil return passage 35g (see figure 7) that housing 35 extends is installed returns lubricating oil dish 36d.Lubricating oil return passage 11j is opened on the washer face between cylinder block 11 and the cylinder head 15, and this lubricating oil return passage 11j is arranged in (see figure 3) between two cooling water passage 11g being opened on the packing ring 56 and the 11h.

Lubricating oil return passage (not shown) that extends and the lubricating oil return passage 35g (see figure 7) of passing 35 extensions of installation housing are returned lubricating oil dish 36d to the lubricating oil that returns from crank box 14 by passing the pump housing 34.

The working condition of the embodiment of the invention with said structure is introduced in chilled(cooling) water return (CWR) below that main reference is shown in Figure 19.

When the live axle 41 that links to each other with bent axle 13 rotates according to the work of motor E, be arranged in cooling waterpump 46 work on the live axle 41, so that supply cooling water, this cooling water is by upwards suction of filter screen 47, and leads to cooling water supply hole 36a on oil tank 36 bottom surfaces by bottom water channel 48 and top water channel 49.Cooling water through this cooling water supply hole 36a flows into cooling water passage 36b and cooling water passage 35a, and this cooling water passage 36b is in the upper surface 36U of oil tank 36, and this cooling water passage 35a is in installing housing 35 bottom surface 35L.A part of cooling water of branch supplies to the first exhaust guide cooling jacket JM1 and the exhaust manifold cooling water jacket JM2 that is formed in the gas exhaust manifold 61 thus, and this first exhaust guide cooling jacket JM1 is formed in the exhaust guide 62 of engine nacelle exhaust passage 24.The exhaust of discharging from the firing chamber 20 of cylinder head 15 is discharged to the exhaust chamber 63 by single tube part 61a and built-up section 61b, the exhaust passage 62d of exhaust guide 62, the exhaust passage 35b that housing 35 is installed and the outlet pipe part 36c of oil tank 36 of gas exhaust manifold 61.Engine nacelle exhaust passage 24 is heated by exhaust in this processing procedure, and cool off by the cooling water that flows through the first exhaust guide cooling jacket JM1 and exhaust manifold cooling water jacket JM2 this engine nacelle exhaust passage 24.

Cooling water temperature after upwards flowing through the first exhaust guide cooling jacket JM1 and exhaust manifold cooling water jacket JM2 increases a little, this cooling water is branched off into by water pipe 68 and branch components 69 and from the pipe joint 61d that is arranged in gas exhaust manifold 61 upper ends and flows through

water pipe

70 and 71, and by being arranged in bottom and the top that pipe joint 11a on the

cylinder block

11 and 11b flow into the side surface of cylinder block cooling jacket JB.In this processing procedure, a part of low-temperature cooling water of cooling

water passage

36b, 35a flows into the bottom of cylinder block cooling jacket JB by two through

hole

11d, 11e, and these two through

hole

11d, 11e are opened among the cooling water passage 11c of cylinder block 11 bottoms.And a part of low-temperature cooling water of cooling

water passage

36b, 35a is by two cooling

water passage

11g, 11h and from flowing into the bottom of cylinder head cooling jacket JH at the cooling water passage 11c of cylinder block 11 bottoms.

When motor E preheating, first thermostat 84 that links to each other with the upper end of cylinder block cooling jacket JB and second thermostat 85 that links to each other with the upper end of cylinder head cooling jacket JH are all closed, cooling water in the first exhaust guide cooling jacket JM1, the gentle cylinder head cooling water cover of exhaust manifold cooling water jacket JM2, cylinder block cooling jacket JB JH all keeps not mobile, thereby promotes the preheating of motor E.At this moment, cooling waterpump 46 lasting rotations, but because of the on every side leakage of cooling water from the rubber impeller of cooling waterpump 46, so this cooling waterpump 46 dallies substantially.

After motor E preheating is finished, when cooling water temperature raises, first and

second thermostats

84 and 85 are opened, and cooling water in cylinder block cooling jacket JB and the cooling water in cylinder head cooling jacket JH flow into the second exhaust guide cooling jacket JM3 by the pipe joint 62h of waste pipe 88 and exhaust guide 62 from the common pipe joint 87a of thermostat lid 87.Cooling water is coolant exhaust guide 62 when flowing through this second exhaust guide cooling jacket JM3, and this cooling water is being discharged in the exhaust chamber 63 after housing 35 and oil tank 36 are installed from top to bottom.When the rotating speed of motor E increases and the internal pressure of cooling

water passage

36b and 35a reaches predetermined value or when higher, relief valve 51 is opened, too much cooling water is discharged in the exhaust chamber 63.

Pipe joint 61e is arranged in the upper end of the exhaust manifold cooling water jacket JM2 of gas exhaust manifold 61, and this pipe joint 61e links to each other with water inspection outlet 66 by flexible pipe 65, and the circulation of cooling water can guarantee by exporting 66 water-sprayings from the water inspection.Because export the upper end that the 66 pipe joint 61e that link to each other are arranged in exhaust manifold cooling water jacket JM2 with the water inspection, the air that is present among the exhaust manifold cooling water jacket JM2 can be discharged from water inspection outlet 66 with cooling water.Like this,, therefore do not need to be provided for the dedicated pipe or the special-purpose air outlet of exhausting air, thereby help to reduce the number of part count and installation step because the air among the exhaust manifold cooling water jacket JM2 utilizes water inspection outlet 66 to discharge.

And, because gas exhaust manifold 61 and water inspection outlet 66 are arranged in the left and right side of outboard motor O, therefore, even water inspection outlet 66 is arranged to be lower than gas exhaust manifold 61, the increase of distance can reduce the gradient that descends between gas exhaust manifold 61 and the water inspection outlet 66, thereby smoothly pushes the air in the gas exhaust manifold 61 to water inspection outlet 66.

In the present embodiment, exhaust manifold cooling water jacket JM2 is communicated with cylinder block cooling jacket JB, and the flow of cooling water that flows through the first exhaust guide cooling jacket JM1, exhaust manifold cooling water jacket JM2 and cylinder block cooling jacket JB is by the control of first thermostat 84.When the first exhaust guide cooling jacket JM1 and exhaust manifold cooling water jacket JM2 are not communicated with cylinder block cooling jacket JB, but when being dead end, needs are increased the diameter of water inspection outlet 66, so that will all discharge from whole cooling waters of exhaust manifold cooling water jacket JM2, perhaps except water inspection outlet 66, coolant outlet is set also, so that the discharge cooling water, but this will produce the problem that cooling water flow increases and the load of cooling waterpump 46 increases.But, according to present embodiment, because the first exhaust guide cooling jacket JM1 and exhaust manifold cooling water jacket JM2 are communicated with cylinder block cooling jacket JB, therefore the cooling water that does not need to flow through the first exhaust guide cooling jacket JM1 and exhaust manifold cooling water jacket JM2 is lavishly discharged, thereby has reduced the load of cooling waterpump 46.

And JH is independently of one another for the gentle cylinder head cooling water cover of cylinder block cooling jacket JB; Low-temperature cooling water directly supplies to and be easy to overheated cylinder head cooling jacket JH in the working procedure of motor E; Cooling water is raising through temperature after the first exhaust guide cooling jacket JM1 and the exhaust manifold cooling water jacket JM2, and this cooling water supplies to and be easy to cold cylinder block cooling jacket JB in motor E working procedure.Therefore, cylinder head 15 and cylinder block 11 can be cooled to their suitable temperature, so that make the performance of motor E reach best.And, because

thermostat

84 and 85 is arranged among the gentle cylinder head cooling water cover of the cylinder block cooling jacket JB JH, therefore, change being provided with of

thermostat

84,85 separately and can carry out independent suitably control the temperature of the cooling water among the gentle cylinder head cooling water cover of the cylinder block cooling jacket JB JH.

When the cooling water of supplying with by the bottom of vertically extending cylinder block cooling jacket JB when discharge its upper end, the temperature of cooling water will be lower in the bottom, and higher, thereby may cause the cooling performance of cylinder block cooling jacket JB vertically also inhomogeneous on top.But, according to present embodiment, the cooling water that flows out from exhaust manifold cooling water jacket JM2 supplies to cylinder block cooling jacket JB in two positions that vertically are separated from each other, and therefore, the cooling performance of cylinder block cooling jacket JB can be vertically even.

Even when supplying with fresh cooling water along with the quick increase of engine speed, during through the first exhaust guide cooling jacket JM1 and exhaust manifold cooling water jacket JM2 after the elevated temperature, this cooling water supplies to cylinder block cooling jacket JB at cooling water.Therefore, can reduce the quick variation of firing chamber 20 temperature on every side.

And, supply with additional cooling water by two through

hole

11d, 11e to cylinder block cooling jacket JB bottom and will prevent that cooling water from resting among the cylinder block cooling jacket JB, and further impel cooling performance even.And, because through

hole

11d, 11e are arranged in the bottom of cylinder block cooling jacket JB, therefore be easy to handle water residual when motor stops.

And, because cooling water is not undertaken by exterior tube to the supply of cylinder head cooling jacket JH from cooling

water passage

36b and 35a, but undertaken by being formed on cooling water passage 11g in the

cylinder block

11 and 11h and the packing ring 56 between cylinder block 11 and cylinder head 15, therefore, not only do not need to assemble specially this

cooling water passage

11g and 11h, and can reduce part count by omitting exterior tube.And, because cooling

water passage

11g and 11h can seal by the packing ring 56 that utilization is clipped between cylinder block 11 and the cylinder head 15, therefore do not need dedicated sealing member, thereby reduced part count.And, because cooling

water passage

11g and 11h are arranged in the bottom of cylinder head cooling jacket JH, therefore be easy to handle water residual when motor stops.

Particularly, because be used for cooling water is arranged to separate along left and right directions from two cooling water passage 11g and the 11h that cylinder block cooling jacket JB supplies to cylinder head cooling jacket JH, therefore, cooling water can supply to the left and right side of cylinder head cooling jacket JH equably, thereby improves cooling effect.And, because be used to guide the lubricating oil return passage 11j of the lubricating oil that returns from cylinder head 15 to be arranged between two cooling water passage 11g and the 11h, therefore, being arranged in the cooling water passage 11g of cam chamber bottommost and 11h and lubricating oil return passage 11j can be arranged in the confined space compactly, prevents to flow through the flow imbalance of the cooling water of two cooling

water passage

11g and 11h simultaneously.

And, because through hole 11d that is communicated with cylinder block cooling jacket JB and 11e and the cooling water passage 11g that is communicated with cylinder head cooling jacket JH and 11h branch in cooling water passage 11c, this cooling water passage 11c is formed in the branch components in the cylinder block 11, therefore dedicated sealing member need be set in branch components, thereby reduce part count.

When the temperature anomaly of cooling water in motor E working procedure raises, can send the warning that motor E may be overheated.In the present embodiment, the cooling-water temperature sensor 67 that is used for cooling system is arranged in the upper end of exhaust manifold cooling water jacket JM2, this cooling system comprises the gentle cylinder block cooling water of the first exhaust guide cooling jacket JM1, exhaust manifold cooling water jacket JM2 cover JB, and is used to comprise that the cooling-water temperature sensor 89 of the cooling system of cylinder head cooling jacket JH is arranged near second thermostat 85.

Like this, whole four water jackets, promptly the first exhaust guide cooling jacket JM1, the gentle cylinder head cooling water cover of exhaust manifold cooling water jacket JM2, cylinder block cooling jacket JB JH are divided into two systems.Therefore, for the gentle cylinder block cooling water cover of the first exhaust guide cooling jacket JM1, exhaust manifold cooling water jacket JM2 JB a cooling-water temperature sensor 67 only need be set.Therefore, the situation that all is provided with cooling-water temperature sensor with in four water jackets each is compared, and the number of parts can reduce.

Particularly, because in the gentle cylinder block cooling water cover of the first exhaust guide cooling jacket JM1, exhaust manifold cooling water jacket JM2 JB, cooling-water temperature sensor 67 is arranged among the exhaust manifold cooling water jacket JM2 of cylinder block cooling jacket JB upstream, therefore, can fast detecting to the unusual increase of cooling water temperature.And, because the cooling-water temperature sensor 67 of exhaust manifold cooling water jacket JM2 be arranged in the water inspection outlet 66 pipe joint 61e that link to each other near, the cooling water flow that flows to water inspection outlet 66 can prevent that cooling water from resting near the cooling-water temperature sensor 67, thus the accuracy that provides cooling water temperature to detect.

First thermostat 84 is used to control cooling water and discharges from the cylinder block cooling jacket, second thermostat 85 is used to control cooling water and discharges from cylinder head cooling jacket JH, first thermostat 84 and second thermostat 85 are arranged on the upper wall of the chain guard 31 that covers timing chain 30, this chain guard 31 is on the upper surface of motor E, and this timing chain 30 provides connection between bent axle 13 and cam 73.Therefore, first and

second thermostats

84 and 85 can keep in repair from above at an easy rate by only taking off hood 40, and can not be subjected to the obstruction of chain guard 31 or timing chain 30.

In addition, because at cooling water passage 31b that connection is provided between the cylinder block cooling jacket JB and

first thermostat

84 and 31c and between the cylinder head cooling jacket JH and second thermostat 85, provide the cooling water passage 31d of connection and 31e to be formed in the chain guard 31, therefore, compare with situation about being connected by exterior tube, the number of parts can reduce.And, because first and second thermostats 84 link to each other with the second exhaust guide cooling jacket JM3 by public waste pipe 88 with 85 outlet side, therefore, not only need be at the inner passage that cooling water is discharged that forms of motor E, thereby can easily carry out machining, and only need a waste pipe 88, thereby reduced part count.

And, because at first thermostat 84 of cylinder block 11 sides and be arranged to closer to each other at second thermostat 85 of cylinder head 15 sides, and first and

second thermostats

84 and 85 are installed on the chain guard 31, this chain guard 31 connects cylinder block 11 and cylinder head 15 by public washer face, therefore first and

second thermostats

84 and 85 can be installed in the confined space compactly.Particularly because be equipped with rotational plane that the

thermostat chamber

94 and 95 of first and

second thermostats

84 and 85 is arranged in timing chain 30 above, therefore can avoid mutual interference, thereby prevent that size from increasing, and obtain compact structure.And cooling water passage 31b that is communicated with

thermostat chamber

94 and 95 and 31d are arranged in the loop of timing chain 30, therefore can effectively utilize dead space, thereby prevent that size from increasing, so that obtain compact structure when avoiding interference mutually.And because cooling water discharges from the highest part of the highest part of cylinder block cooling jacket JB and cylinder head cooling jacket JH, so cooling water is easy to discharge.

In addition, because being used for cooling water is supplied to the upside pipe joint 11a of cylinder block cooling jacket JB is not the sidepiece that is arranged in the highest firing chamber 20, but be arranged in the sidepiece of the second high firing chamber 20, therefore can prevent first thermostat 84 because the low-temperature cooling water of being supplied with by pipe joint 11a acts on this first thermostat and carry out inappropriate operation.In addition, in order to make first thermostat, 84 proper operation, pipe joint 11a will be arranged to be lower than at least the vertical medium position of high combustion chamber 20.

Introduced one embodiment of the present of invention above, but the present invention is not limited to the foregoing description, but can under the situation that does not break away from theme of the present invention, carries out various variations.

For example, in the present embodiment, represented multicylinder engine E, but the present invention also can be used for single-cylinder engine.

Claims

1. water-cooled vertical engine comprises:

Bent axle, this bent axle is arranged vertically substantially;

Camshaft; And

The annular transmission part is used for the driving force of bent axle is passed to camshaft, rotates along a track thereby this annular transmission part is arranged in the top of motor;

Wherein, this motor also comprises:

Be formed at water jacket wherein, this water jacket has coolant outlet, and this coolant outlet is to the upper opening of motor and be positioned at the rotary motion trace of described annular transmission part; And

Thermostat is used for being controlled at the flow of the cooling water of water jacket, and this thermostat is arranged in the top of motor and has the temperature sensing part that is higher than this annular transmission part.

2. water-cooled vertical engine according to claim 1 is characterized in that: this annular transmission part is a timing chain, and the top of this motor comprises chain guard, and this chain guard covers timing chain, and this chain guard cooperates with cylinder head and cylinder block.

3. outboard motor that is equipped with water-cooled vertical engine comprises:

Bent axle, this bent axle is arranged vertically substantially;

Camshaft; And

The annular transmission part is used for the driving force of bent axle is passed to camshaft, and this annular transmission part is arranged in the top of motor;

Wherein, this motor also comprises:

Be formed at water jacket wherein;

Water pump is used for supplying with cooling water to described water jacket; And