JPH0331094A - Outboard engine - Google Patents

Abstract

PURPOSE:To prevent a temperature rise of lubricating oil by connecting a cooling water guide member, in which a cooling water passage is formed in the outer position from the upper part opening end of an oil pan, to the lower end of an engine mount member connected to the upper end of a casing internally built with a drive power transmitting means. CONSTITUTION:An outboard engine has a casing 1 in which an engine E is mounted to the upper part, and an engine mount member 6 is connected to the upper end part of an extension case 5 extended to the upper and lower of this casing 1. here the case 5, oil pan 21 and the mount member 6 are connected by interposing a common gasket 27 mutually therebetween. This gasket 27 is formed by providing an opening part 51, through which a recessed part 43 of the oil pan 21 communicates with a water-rising passage 44 of the mount member 6, and an opening part 52 through which exhaust passages 47, 48 communicate. Cooling water, circulated downward in a water dropping passage 45, is prevented from circulating to the side of the oil pan 21 by the gasket 27 so as to be guided to the downstream via a cooling water passage 55 partitioned between the gasket and the mount member 6.

Description

Detailed Description of the Invention A0 Object of the Invention (1) Industrial Application Field The present invention relates to a casing incorporating a driving force transmitting means, and a propeller connected to the driving force transmitting means and supported at the lower end of the casing. an engine mount member coupled to the upper end of the casing; an engine mounted on the engine mount member while connected to a driving force transmission means; and an oil pan coupled to the lower end of the engine mount member within the casing. Regarding outboard motors.

(2) Prior Art Conventionally, such an outboard motor is known from Japanese Patent Laid-Open No. 58-43897 and the like.

(3) Problems to be Solved by the Invention By the way, in outboard motors that are frequently operated at full load continuously, as the oil temperature rises, the intake air temperature rises due to heat dissipation from the crankcase side, where no cooling water jacket is formed. It is desirable to be able to prevent an increase in oil temperature with a simple structure, which tends to cause a decrease in engine filling efficiency.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide an outboard motor that can prevent an increase in oil temperature with a relatively simple structure.

B0 Structure of the Invention (1) Means for Solving the Problems According to the first feature of the present invention, a cooling water passage is formed at the lower end of the engine mount member at a position outward from the upper opening end of the oil pan. A cooling water guide member is coupled.

According to a second feature of the present invention, the cooling water passage includes:
It is connected to the engine's cooling water jacket via a thermostatic valve to introduce water after cooling the engine.

According to the third feature of the present invention, a gap is provided between the cooling water guide member and the cooling water guide member of the engine mount member (3) to form a cooling water discharge means of the cooling water passage.

According to the fourth feature of the present invention, the cooling water guide member includes:
A plurality of holes are drilled to form cooling water discharge means for the cooling water passage.

Furthermore, according to a fifth feature of the present invention, the joint surfaces of the casing and the engine mount member and the joint surfaces of the engine mount member and the oil pan are set to be on the same plane, and the gasket interposed between the recombination surfaces A cooling water guide member is formed integrally with the cooling water guide member.

(2) Effect According to the configuration of the first feature, the cooling water flowing through the cooling water passage cools the lubricating oil that comes into contact with the engine mount member and flows down to the oil pan, suppressing the rise in oil temperature, and It is possible to suppress a decrease in filling efficiency.

Further, according to the configuration of the second feature, overcooling of the lubricating oil immediately after engine startup is avoided.

According to the configuration of the third feature, the cooling water guide member;
The cooling water discharged from the gap formed between the engine mount member (3) and the cooling water guide member travels along the outer surface of the oil pan, thereby effectively cooling the oil pan.

According to the configuration of the fourth feature, the cooling water is discharged around the oil pan from the plurality of holes formed in the cooling water guide member, thereby cooling the oil pan.

Furthermore, according to the configuration of the fifth feature, the cooling water passage can be formed without increasing the number of parts.

(3) Examples Embodiments of the present invention will be described below with reference to the drawings.

First, in FIGS. 1 and 2 showing an embodiment of the present invention, a casing 1 is attached to the stern plate of a ship (not shown) via support means 2, and an engine E is mounted on the upper part of the casing 1. is mounted, and power from the engine E is transmitted to a propeller 4 supported at the bottom of the casing 1 via a driving force transmission means 3 built in the casing 1.

Referring to FIGS. 3 and 4 together, the casing 1 includes an extension case 5 extending vertically, and a gear case 7 coupled to the lower end of the extension case 5. The engine body 8 of the engine E is coupled onto the engine mount member 6 that is attached to the engine. Moreover, the engine mount member 6 and the upper part of the casing l, that is, the upper part of the extension case 5, are covered by a cover 9, and a cover 12 consisting of an engine lower cover 10 and an engine upper cover 11 is installed at the upper end of the cover 9 to cover the engine E. Connected to cover.

The engine E is, for example, a three-cylinder, four-stroke engine, and the engine body 8 is coupled onto the engine mount member 6 with its crankshaft 13 in the vertical direction.

The driving force transmission means 3 includes a drive shaft 14 that has an axis eccentrically offset from the axis of the crankshaft 13 and extends vertically within the casing 1, and a drive shaft 14 that extends between the upper end of the drive shaft 14 and the crankshaft 13. Gear train 1 for interlocking and connecting
5, a pinion shaft 16 coaxially connected to the lower end of the drive shaft 14, and a bevel gear mechanism 18 interposed between the rotating shaft 17 connected to the propeller 4 and the pinion shaft 16, and the hevel gear mechanism 18 is capable of forward and reverse movement. It is configured to be switchable. The gear train 15 includes an engine mount member 6 as a primary gear case and an engine body 8. It is stored and placed between. Further, the drive shaft 14 has its upper end rotatably supported by the engine mount member 6 and its lower end rotatably supported by the gear case 7 . It is stored and arranged.

Referring to FIGS. 5 and 6 together, an oil pan 21 for storing lubricating oil is coupled to the lower part of the engine mount member 6. The lubricating oil in the oil pan 21 is pumped up via an oil strainer 22 by an oil pump (not shown) driven by the camshaft or crankshaft 13, and is supplied to each lubricating section of the engine E. Moreover, the lubricating oil from each lubricating part is returned from the lower part of the engine body 8 into the oil pan 21 via the engine mount member 6. That is, at the lower end of the engine main body 8, there is provided an engine mount member coupling coupling cylinder part 23 for accommodating the gear train 15 and coupling it to the engine mount member 6, and at the upper part of the engine mount member 6,
A connecting cylinder part 24 for connecting to the engine body is provided to be connected to the lower end surface of the connecting cylinder part 23. Moreover, on the upper surface of the engine mount member 6, there is provided a dish portion 2 with the connecting cylinder portion 24 as a peripheral wall.
5 is provided, and the lubricating oil from each lubricating part of the engine E is collected in the connecting cylinder part 23 for connecting the engine mount member at the lower part of the engine body 8, and then flows down to the dish part 25. Further, an oil passage 2 opens at the deepest part of the dish portion 25 and extends downward, and opens above the oil pan 21.
6 is provided on the engine mount member 6, and the plate portion 2
The lubricating oil flowing down to the oil pan 21 from the oil passage 26
will be returned to.

At the lower end inside the extension case 5, the gear case 7
On the top is a cooling water pump 3 which is rotationally driven by a drive shaft 14.
0 is provided, and water introduced through a filter 31 is pumped up by the cooling water pump 30, and is connected to the cooling water pump 30 and extends upward from a water supply pipe 32 to the oil pan 21 and the engine. The cooling water is supplied to the cooling water jacket 33 of the engine body 8 via the mount member 6 .

That is, the engine body 8 is provided with three cylinders 35 arranged vertically in which the pistons 34 are slidably fitted, respectively, and the cooling water jacket 33 is provided in the engine body 8 so as to surround these cylinders 35. It will be done.

Also, an engine mount member 6 is provided on the bottom surface of the engine body 8.
An inlet 36 is provided to guide the cooling water rising inside the cooling water jacket 33, and the cooling water discharged from the engine body 8 is introduced into the engine mount member 6.
An outlet 37 leading out to the side is provided adjacent to the inlet 36. Moreover, a thermostatic valve 38 that operates according to the temperature of the cooling water is disposed at the upper end of the cooling water jacket 33, and the cooling water jacket 33 is connected to a cooling water passage provided in the engine body 8 and connected to the outlet port 36. 39 via the thermostatic valve 38.

The upper end of the oil pan 21 is provided with an outer edge that is a part of the joint with the engine mount member 6 that extends laterally, and this outer edge has a connection to which the upper end of the water supply pipe 32 is connected. A recess 43 having an opening 42 at a lower closed end is provided and opens upward. Further, the engine mount member 6 is provided with a water ascending passage 44 connecting the recess 43 and the inlet 36 of the engine main body 8, and a water descending passage 45 communicating with the outlet 36 of the engine main body 8. drilled.

On the other hand, the engine body 8 is provided with an exhaust passage 46 for discharging exhaust gas, and the engine mount member 6 is provided with an exhaust passage 47 extending vertically and communicating with the exhaust passage 46. An exhaust passage 48 extending vertically and communicating with the exhaust passage 47 is also formed at the outer edge of the upper end of the extension case 5 , and an exhaust pipe 49 extending downward within the extension case 5 is connected to the exhaust passage 48 .

Thus, the exhaust gas discharged from the engine E is discharged into the extension case 5.

In addition, the extension case 5 is provided with a low-speed operation exhaust port 50 that opens rearward at a position above the water surface for discharging exhaust gas into the atmosphere during low-speed operation, and the gear case 7 is provided with a low-speed operation exhaust port 50 that opens rearward at a position above the water surface. A high-speed operation exhaust port 41 for discharging water into the water is opened toward the rear at a position above the propeller 4.

That is, extension case 5 and gear case 7
The exhaust gas pressure inside the casing 1 changes depending on the operating condition, and since the exhaust gas pressure is relatively low during low-speed operation, the water surface inside the casing 1 is located above the high-speed operation exhaust port 41, and the exhaust gas is transferred to the upper low-speed operation. Since the exhaust gas pressure is relatively high during high-speed operation, the water surface in the casing 1 is located below the high-speed operation exhaust port 41, and the exhaust gas is discharged from the high-speed operation exhaust port 41.
will be discharged into the water.

Referring also to FIG. 7, the engine mount member 6 and the extension case 5, as well as the engine mount member 6 and the oil pan 21, are joined on the same plane, and the extension case 5 and the oil pan 21 and the engine mount The members 6 are connected to each other with a common gasket 27 interposed between the phase tiles. That is, the oil pan 2 is located at the bottom of the engine mount member 6.
Connecting cylinder part 2 for oil pan connection corresponding to the upper end opening edge of 1
8 and an extension case coupling connecting cylinder part 29 which serves to connect the extension case 5 to the extension case connecting cylinder part 2.
9 is formed so as to surround the connecting cylinder part 28 for coupling the oil pan, and the lower end surfaces of both the connecting cylinder parts 2B and 29, that is, the connecting surfaces 28a and 29a are formed on the same plane. The gasket 27 is formed into a flat plate shape with the outer periphery of the extension case coupling connecting cylinder part 29 as an outer peripheral edge and the inner periphery of the oil pan connecting connecting cylinder part 28 as an inner peripheral edge, and the gasket 27 is formed into a flat plate shape with the outer periphery of the extension case connecting connecting cylinder part 29 as an inner peripheral edge, and the gasket 27 Opening 5 that communicates the recess 43 with the water rising passage 44 of the engine mount member 6
1, and an opening 52 that communicates the exhaust passage 47 of the engine mount member 6 with the exhaust passage 48 of the oil pan 2.

Therefore, from the engine mount member 6 to the oil pan 21
The lubricating oil falls into the interior, the cooling water rises from the outer edge of the oil pan 21 to the engine mount member 6, and the exhaust gas flows from the engine mount member 6 to the outer edge of the oil pan 21 through the gasket 27. Although it can be done freely, the water descending passage 4 provided in the engine mount member 6
The cooling water that has flowed downward in the oil pan 5 is prevented from flowing toward the oil pan 21 by the gasket 27.

Thereby, the gasket 27 also functions as a cooling water guide member that forms a cooling water passage 55 that guides the cooling water flowing down from the engine E downstream between the gasket 27 and the engine mount member 6.

That is, in the engine mount member 6, the water descending passage 45 is arranged to open between the oil pan coupling connecting cylinder part 28 and the extension case coupling connecting cylinder part 29, and the opening of the water descending passage 45 is In order to define the area including the area as one section, the connecting cylinder part 2 for connecting the oil pan
A pair of partition walls 53 and 54 are provided between the extension case connecting tube portion 8 and the extension case coupling connecting cylinder portion 29. Therefore, a cooling water passage 55 is formed at a position outward from the upper open end of the oil pan 21 by the oil pan coupling coupling cylinder part 28, the extension case coupling coupling cylinder part 29, both partition walls 53 and 54, and the gasket 27. It turns out. Furthermore, a plurality of holes 56 forming cooling water discharge means are bored in the gasket 27 at a portion corresponding to the cooling water passage 55.

Referring again to FIG. 3, the rear part of the extension case 5 is provided with an inner wall 5a that extends upwardly inwardly from the outer wall and outwardly from the oil pan 21. A partition wall 57 that abuts the upper end via the gasket 27 is provided across the engine mount member 6 between the oil pan coupling coupling cylinder part 28 and the extension case coupling coupling cylinder part 29 . As a result, the engine mount member 6 and the gasket 2
Of the chambers defined between 7 and 7, excluding the cooling water passage 55 (
A first exhaust silencing chamber 58 is defined by the partition walls 53, 54, 57, and a second exhaust silencing chamber 5 is defined between the partition wall 57 and the extension case coupling connecting cylinder part 29.
9 is defined.

Further, a third exhaust silencing chamber 60 is defined by the rear outer wall, inner wall 5a and gasket 27 of the extension case 5, and the exhaust port 50 for low speed operation is connected to the third exhaust silencing chamber 60.
It is provided on the rear outer wall of the extension case 5 in a continuous manner.

The gasket 27 is provided with a large number of exhaust introduction holes 61 in a portion corresponding to the first exhaust silencing chamber 58 in order to guide the exhaust gas discharged from the exhaust pipe 49 into the extension case 5 to the first exhaust silencing chamber 58. , second exhaust silencing chamber 5
A large number of exhaust outlet holes 62 are bored in portions corresponding to the second and third exhaust silencing chambers 59 and 60 in order to guide exhaust gas from the exhaust silencing chamber 9 to the third exhaust silencing chamber 60. Further, a large number of guide holes 63 (see FIG. 3) are bored in the partition wall 57 to guide exhaust gas from the first exhaust silencing chamber 58 to the second exhaust silencing chamber 59.

Referring also to FIG. 8, the support means 2 includes a stern bracket 65 attached to the stern plate of the hull, a swivel case 66 connected to the stern bracket 65 so as to be tiltable, and a swivel case 66 that can be operated by the swivel case 66. A swivel shaft 67 that is rotatably supported, an upper support arm 68 provided at the upper part of the swivel shaft 67, a lower support arm 69 provided at the lower part of the swivel shaft 67, and between the upper support arm 68 and the engine mount member 6. and a pair of elastic members 71 that connect the lower support arm 69 and the extension case 5 (+ti).

A cylinder 72 connected to the swivel case 66 is supported by a clevis on the stern bracket 65 to tilt the swivel case 66.

The upper support arm 68 is formed so that its distal end side is bifurcated, and the side surface of the engine mount member 6 on the support means 2 side is used to securely fit the elastic members 70 attached to the distal ends of the upper support arm 68, respectively. has a pair of fitting recesses 73.
is provided.

Next, to explain the operation of this embodiment, the cooling water supplied to the engine from the cooling water pump 30 is guided from the cooling water passage 39 to the water descending passage 45 after cooling the engine body 8, and then further to the engine mount member. Water is supplied to a cooling water passage 55 formed between the gasket 6 and the gasket 7. Therefore, the relatively high-temperature lubricating oil that returns from the engine E to the oil pan 21 is cooled by the engine mount member 6 that comes into contact with it on the way, and as a result, the oil temperature does not rise excessively even if continuous full-load operation is continued. This is avoided, and an increase in intake temperature is also prevented, so there is no reduction in engine charging efficiency. In addition, the cooling water passage 39 and subsequent passages are located downstream of the thermostat valve 3, and there is no cooling water below a certain temperature introduced immediately after engine E starts, and during this period, the main descending passage 45
Since the engine mount member 6 is not cooled by the cooling water passage 55, the lubricating oil does not have to be cooled to the extent that it would impede the warm-up operation of the engine E after a cold start.

Furthermore, the water rising passage 44 prevents the engine mount member 6 from becoming excessively heated due to the exhaust gas flowing through the exhaust passage 47, and returns from each lubricating part of the engine E to the oil pan 2 via the engine mount member 6. The lubricating oil is also prevented from being heated by the engine mount member 6.

Moreover, the cooling water in the cooling water passage 55 falls around the oil pan 21 from a plurality of holes 56 provided in the gasket 27, and this falling cooling water causes the oil pan 21 to fall.
itself is cooled, which more effectively prevents excessive heating of the lubricating oil.

Incidentally, during low-speed operation, exhaust gas from the engine E is discharged from the exhaust pipe 49 into the extension case 5 via the exhaust passages 46, 47, 48, and further into the extension case 5 through the exhaust introduction hole 61.
, first exhaust silencing chamber 58, guide hole 63, second exhaust silencing chamber 59
, through the exhaust outlet hole 62 and the third exhaust silencing chamber 60, and is discharged to the outside from the low-speed operation exhaust port 50. By using such an exhaust route, it is possible to increase the passage resistance while ensuring a passage area for exhaust gas, and thus it is possible to contribute to reducing exhaust noise during low-speed operation.

FIG. 9 shows another embodiment of the present invention, and parts corresponding to the above embodiments are given the same reference numerals.

In this embodiment, in the engine mount member 6, a cooling water passage 55 is provided over the entire circumference between the connecting cylinder part 28 for connecting the oil pan and the connecting cylinder part 29 for connecting the extension case.
', and the connecting cylinder part 2 for connecting the oil pan.
A gasket 27 different from the gasket (not shown) interposed between 8 and the oil pan 21 (see the above embodiment).
' is interposed between the extension case connecting connecting cylinder parts 29. Moreover, the inner periphery of the gasket 27' is determined to form a gap 56'' between the engine mount member 6 and the connecting portion of the oil pan 21, which serves as a cooling water discharge means.

According to this embodiment, the cooling water in the cooling water passage is allowed to flow through the gap 56'.
The coolant water is discharged from the oil pan 21.
Since the oil flows down along the outer surface of the oil pan 21, the oil pan 21 is cooled even more effectively.

C1 Effects of the invention As described above, according to the first feature of the invention, a cooling water guide member that forms a cooling water passage at a position outward from the upper opening end of the oil pan is coupled to the lower end of the engine mount member. Therefore, it is possible to form a cooling water passage in the engine mount member with a simple structure, cool the engine mount member with the cooling water flowing through the cooling water passage, and prevent a rise in lubricating oil temperature.

According to a second feature of the present invention, the cooling water passage includes:
In order to introduce water after cooling the engine, it is connected to the engine cooling water jacket via a thermostatic valve.
Overcooling of the lubricating oil immediately after the engine is started is avoided, and interference with warm-up of the engine is prevented.

According to the third feature of the present invention, a gap is provided between the cooling water guide member and the cooling water guide member of the engine mount member (3) to form a cooling water discharge means for the cooling water passage. , the oil pan can be effectively cooled by discharging cooling water along the outer surface of the oil pan.

According to the fourth feature of the present invention, the cooling water guide member includes:
Since yi holes are drilled to form a cooling water discharge means for the cooling water passage, the oil pan can be cooled by discharging cooling water from the plurality of holes around the oil pan.

Furthermore, according to a fifth feature of the present invention, the joint surfaces of the casing and the engine mount member and the joint surfaces of the engine mount member and the oil pan are set to be on the same plane, and the gasket interposed between the recombination surfaces Since the cooling water guide member is formed integrally with the cooling water guide member, it is not necessary to provide a cooling water guide member in particular, and the cooling water passage can be formed with a simple structure that reduces the number of parts.

[Brief explanation of drawings]

1 to 8 show one embodiment of the present invention, FIG. 1 is an overall side view of the outboard motor, and FIG. 2 is a side view of the outboard motor.
-■ line sectional view, the third is a partially enlarged vertical side view along the ■-■ line in Figure 2, Figure 4 is a cross-sectional view along the IV-IV line in Figure 3,
Figure 5 is a sectional view taken along line ■-V in Figure 3, and Figure 6 is a cross-sectional view taken on line ■-V in Figure 3.
-Vt line sectional view, FIG. 7 is a sectional view taken along the ■-■ line in FIG. 3, FIG. 8 is an enlarged sectional view taken along the ■-■ line in FIG. FIG. 7 is a sectional view corresponding to FIG. 7; 1...Casing, 3...Driving force transmission means, 4...
・Propeller, 6...Engine mount member, 21...
・Oil pan, 27.27'...Gasket as a cooling water guide member, 33...Cooling water jacket, 3
8... Thermostatic valve, 55. 55'... Cooling water passage, 56... Hole as cooling water discharge means, 56'
...Gap as a means for discharging cooling water, E...Engine Patent Attorney Ken Ochiai, Patent Attorney Honda Motor Co., Ltd. 1) Takahide Naka 4 Figure 5 Figure 7 Figure 6 I , Figure 9

Claims (5)

[Claims] (1) A casing containing a driving force transmitting means, a propeller connected to the driving force transmitting means and supported at the lower end of the casing, an engine mount member connected to the upper end of the casing, and a propeller connected to the driving force transmitting means. In an outboard motor that includes an engine that is mounted on an engine mount member and an oil pan that is connected to the lower end of the engine mount member within a casing, the lower end of the engine mount member is lower than the upper opening end of the oil pan. An outboard motor characterized in that a cooling water guide member forming a cooling water passage is coupled to an outer position. (2) The outboard motor according to item (1), wherein the cooling water passage is connected to a cooling water jacket of the engine via a thermostatic valve to introduce water after cooling the engine. (3) Item (1), characterized in that a gap is provided between the cooling water guide member and the connecting portion of the engine mount member and the oil pan to form a cooling water discharge means for the cooling water passage. Outboard motor listed. (4) The outboard motor according to item (1), wherein the cooling water guide member is provided with a plurality of holes to form cooling water discharge means for the cooling water passage. (5) The joint surface between the casing and the engine mount member and the joint surface between the engine mount member and the oil pan are set on the same plane, and the gasket and cooling water guide member interposed between the two joint surfaces are integrally formed. The outboard motor according to item (1) or item (4), characterized in that: