JP4044179B2 - Outboard motor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an outboard motor in which an engine is mounted on a guide exhaust.
[0002]
[Prior art]
The guide exhaust may be provided with a device such as an oil pump protruding upward. When the engine is placed on the guide exhaust, the seal surface on the lower surface of the engine may come into contact with the device and the seal surface may be damaged.
[0003]
[Problems to be solved by the invention]
By the way, exhaust gas, lubricating oil, cooling water, and the like flow between the guide exhaust and the engine. When the seal surface of the engine is damaged, liquid leakage or gas leakage occurs.
[0004]
An object of the present invention is to provide an outboard motor capable of reducing damage to the seal surface of the engine as much as possible when the engine is mounted on a guide exhaust. And
[0005]
[Means for Solving the Problems]
In the outboard motor of the present invention, the seal surface on the lower surface of the engine (16) is mounted on the engine mounting surface (51) of the guide exhaust (38), and the device (28) is above the engine mounting surface. It is installed on the guide exhaust. In addition, a guide pin (71) is provided in one of the engine and the guide exhaust, and a guide opening (63) that engages with the guide pin is provided in the other of the engine or the guide exhaust. The engine is mounted on the guide exhaust while the guide pin is engaged and guided to the guide opening. And when the front-end | tip of a guide pin is located in the edge part by the side of the opening of a guide opening, the seal surface of an engine is located above the apparatus installed in the guide exhaust.
[0006]
Further, the guide pin or the guide opening provided in the guide exhaust may be disposed at a location away from the engine placement surface.
[0007]
Further, a knock pin (61) for final positioning is provided on one of the engine or the guide exhaust, and a knock pin engaging hole (68) for engaging the knock pin is provided on the other of the engine or the guide exhaust. May be lower than the guide pin.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of an outboard motor according to the present invention will be described with reference to FIGS. FIG. 1 is a sectional view of an outboard motor according to the present invention as viewed from the left side. FIG. 2 is a right side view of the engine and the guide exhaust. FIG. 3 is a cross-sectional view of the engine as viewed from the right side. FIG. 4 is an enlarged view of a main part of FIG. FIG. 5 is a plan view of a guide exhaust in which an oil pump is installed. FIG. 6 is a plan view of the oil pump. FIG. 7 is a plan view of the guide exhaust with the gasket attached. FIG. 8 is a plan view of the gasket. In FIG. 3, the guide exhaust is shown in a side view, and the oil pump is partly shown in a sectional view. Moreover, in FIG. 7 and FIG. 8, the broken line has shown the bead.
[0009]
First, the overall structure of the outboard motor will be described. The outboard motor is covered with a housing including an upper cowling 1, a lower cowling 2, an upper casing 3, and a lower casing 4 in order from the upper side. The upper casing 3 and the lower casing 4 constitute a casing, and the lower casing 4 is formed with a cooling water inlet 11 and a cooling water outlet 12.
[0010]
An engine 16 is provided in a cowling composed of an upper cowling 1 and a lower cowling 2, and a crankshaft 17 of the engine 16 is connected to a drive shaft 19. The drive shaft 19 penetrates the inside of the upper casing 3 in the vertical direction, and the lower end thereof reaches the lower part of the lower casing 4. A propeller 22 is attached to the rear end portion via a transmission mechanism 21 such as a bevel gear. The propeller shaft 24 is driven to rotate. The drive shaft 19, the transmission mechanism 21, and the propeller shaft 24 constitute a propulsion unit drive system. The drive shaft 19 is provided with a cooling water pump 27 at an intermediate portion thereof, and an oil pump 28 as a device at an upper end portion thereof, and is driven by the rotation of the drive shaft 19. Further, the lower end portion of the shift rod 29 switches the transmission mechanism 21 to forward, neutral or reverse.
[0011]
A mounting bracket 33 for mounting the outboard motor on a small vessel is fixedly attached to a transom 36 of the small vessel. The outboard motor main body is rotatably attached to the rear portion of the mounting bracket 33 via a pivot shaft or the like.
[0012]
The engine 16 is mounted on a guide exhaust 38 made of aluminum alloy and fixed with bolts or the like. The engine 16 is an L-type four-cycle four-cylinder. The cylinder body 39 is provided with four substantially horizontal cylinders 41 in the vertical direction, and a piston 42 can slide on each cylinder 41. Is arranged. One end of a connecting rod 43 is connected to the piston 42, and the other end of the connecting rod 43 is connected to the crankshaft 17. The crankshaft 17 side of the cylinder body 39 is covered with a crankcase 44, while the combustion chamber 45 side of the cylinder body 39 is covered with a cylinder head 46. The engine case 47 of the engine 16 is made of an aluminum alloy and includes the cylinder body 39, the crankcase 44, the cylinder head 46, and the like, and is installed with the combustion chamber 45 side as the rear side.
[0013]
Next, the structure in which the engine 16 is attached to the guide exhaust 38 will be described in detail. An oil pump 28 is attached to the upper surface of the front portion of the guide exhaust 38 in a protruding state. The upper end portion of the drive shaft 19 is inserted into the rotating shaft of the oil pump 28 from below and is spline-fitted, and protrudes upward from the oil pump 28. A fitting hole 48 at the lower end of the crankshaft 17 of the engine 16 is spline-fitted to the projecting portion of the drive shaft 19.
[0014]
An engine mounting surface 51 is formed on the upper surface of the guide exhaust 38 on both the left and right sides and the rear side of the oil pump 28. The engine mounting surface 51 includes an exhaust gas flow channel 53, a cooling water flow channel. 54, the oil return flow paths 56 and 57, the oil discharge flow path 58, and the like are formed in a state of penetrating the guide exhaust 38. Further, two knock pins 61 for final positioning are formed on the engine placement surface 51 so as to protrude. In addition, two guide openings 63 are formed in front of the engine placement surface 51 so as to be distributed to the left and right sides, and the guide openings 63 are configured with a bottomed hole.
[0015]
A gasket 64 shown in FIG. 8 is placed on the peripheral edge of the guide opening 63 and the engine placement surface 51. In the gasket 64, portions facing the exhaust gas flow path 53, the cooling water flow path 54, the oil return flow paths 56 and 57, the oil discharge flow path 58, the knock pin 61, and the guide opening 63 are open. The gasket 64 is formed with a bead 66 shown by a broken line. The bead 66 is a protrusion, and prevents gas leakage and liquid leakage when the engine 16 is placed.
[0016]
A recess into which the oil pump 28 is fitted is formed on the lower surface of the cylinder body 39 of the engine 16, and a seal surface is formed in a portion facing the engine placement surface 51 and facing the knock pin 61. A knock pin engaging hole 68 is formed in the portion. Further, a guide pin 71 projects from the lower surface of the crankcase 44 of the engine 16 at a position facing the guide opening 63. The guide pin 71 is formed longer than the knock pin 61 and fits in the guide opening 63. On the other hand, the knock pin 61 fits into the knock pin engaging hole 68. In the fitted state, the radial gap formed between the guide pin 71 and the guide opening 63 is larger than the radial gap formed between the knock pin 61 and the knock pin engaging hole 68. Further, the radial dimensions of the guide pin 71, the guide opening 63, the knock pin 61, and the knock pin engaging hole 68 are determined, and the positioning by the knock pin 61 has higher accuracy than the positioning by the guide pin 71. ing. Further, the protruding amount A of the guide pin 71 from the seal surface is set larger than the protruding amount B of the oil pump 28 from the engine placement surface 51.
[0017]
When the engine 16 is mounted on the guide exhaust 38, the oil pump 28 and the gasket 64 are attached on the guide exhaust 38 in advance. When the engine 16 is lowered toward the guide exhaust 38, first, the guide pin 71 is engaged with the guide opening 63, and the engine 16 is positioned on the guide exhaust 38. By the way, when the tip of the guide pin 71 reaches the opening side end of the guide opening 63, the seal surface of the engine 16 is located above the upper end of the oil pump 28, and the seal surface of the engine 16 Is less likely to contact the oil pump 28.
[0018]
Next, the engine 16 is lowered while being guided by the guide pins 71, the crankshaft 17 is engaged with the drive shaft 19, and the engine 16 is further lowered so that the knock pin engaging hole 68 of the engine 16 is moved to the knock pin. The final positioning is performed by engaging with 61 and positioning with higher accuracy. When the engine 16 is attached, that is, when the engine 16 is mounted on the guide exhaust 38, the gasket 64 is sandwiched between the seal surface of the engine 16 and the engine mounting surface 51 to prevent gas leakage or liquid leakage. is doing.
[0019]
As described above, in the embodiment, the protrusion amount of the guide pin 71 from the seal surface of the engine 16 (when the guide pin 71 is provided on the guide exhaust 38 side, the protrusion from the engine mounting surface 51 is provided. Therefore, when the engine 16 is lowered toward the guide exhaust 38, the guide pin 71 first opens the guide opening 63 when the engine 16 is lowered toward the guide exhaust 38. To reach. When the guide pin 71 reaches the guide opening 63, the seal surface of the engine 16 is located above the equipment such as the oil pump 28. The engine 16 descends while being guided by the guide pins 71, and the seal surface of the engine 16 is placed on the engine placement surface 51 via the gasket 64. Therefore, when the engine 16 is lowered, the device can be prevented from coming into contact with the sealing surface of the engine 16 and damaging the sealing surface.
[0020]
Further, a plurality of guide pins 71 are provided, and are provided so as to be located on both the left and right sides of the equipment such as the oil pump 28. The distance between the guide pins 71 is large, and the engine 16 can be lowered stably. Can do.
[0021]
Further, the guide opening 63 is a bottomed hole and is sealed by a gasket 64 sandwiched between the lower surface of the engine 16 and the upper surface of the guide exhaust 38 when the engine 16 is mounted. Accordingly, it is possible to prevent water or the like from entering the guide opening 63. As a result, salting or the like in the guide opening 63 can be prevented. Moreover, since the gasket 64 is integrally formed with the gasket on the engine mounting surface 51, the number of parts can be reduced as compared with the case where a gasket dedicated to the guide opening 63 is provided.
[0022]
And since the guide pin is arrange | positioned in the position away from the engine sealing surface of the engine and the engine mounting surface of the guide exhaust, it will reduce that the front-end | tip of a guide pin contacts a sealing surface or an engine mounting surface. . As a result, the guide pin can be prevented from damaging the seal surface, the engine mounting surface, the gasket, and the like.
[0023]
Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the gist of the present invention described in the claims. Can be done. Examples of modifications of the present invention are illustrated below.
(1) In the embodiment, the engine 16 is a four-cycle four-cylinder, but the type, the number of cylinders, and the like can be changed as appropriate. For example, it is possible to use two cycles or a single cylinder.
[0024]
(2) In the embodiment, the device installed in the guide exhaust is an oil pump, but other devices such as an upper mount are also possible. The rotation shaft of the oil pump 28 is engaged with the drive shaft 19, but it can also be engaged with the crankshaft 17 and is driven to rotate by the driveshaft 19 or the crankshaft 17.
(3) In the embodiment, the guide pin is provided on the engine side, but may be provided on the guide exhaust side. However, it is preferable in terms of space to be provided on the engine side.
[0025]
(4) The guide pin mounting structure can be selected as appropriate. For example, the guide pin can be formed integrally with the engine, or the guide pin can be detachably configured by screwing or the like. Furthermore, the cross-sectional shape of the guide pin and the guide opening is not limited to a circle but can be selected as appropriate.
(5) A taper can be formed at the tip of the guide pin or the tip of the guide opening. When the taper is formed in this way, the guide pin can be easily inserted into the guide opening. The number of guide pins and knock pins can be selected as appropriate. However, in order to perform positioning stably, it is preferable to provide a plurality of them at intervals.
[0026]
(6) In the embodiment, the guide opening is a bottomed hole, but other structures may be used. For example, it can be configured by a through hole, a slit, or the like.
(7) It is also possible to form a guide opening on the engine mounting surface.
(8) In the embodiment, the gasket extends to the guide opening, but the gasket may not reach the guide opening.
[0027]
【The invention's effect】
According to the present invention, a guide pin is provided on one side of the engine or the guide exhaust, and a guide opening that engages with the guide pin is provided on the other side of the engine or the guide exhaust. When the engine is positioned at the end of the opening, the sealing surface of the engine is positioned above the device installed in the guide exhaust. Therefore, when the engine is lowered toward the guide exhaust, first, the guide pin is engaged with the guide opening, and then the engine is lowered while being guided by the guide pin. As a result, the seal surface of the engine is less likely to come into contact with equipment, and damage to the seal surface can be prevented.
[0028]
In addition, when the guide pin or the guide opening provided in the guide exhaust is arranged at a location away from the engine mounting surface, the tip of the guide pin contacts the engine mounting surface or the seal surface. That will decrease. As a result, the tip of the guide pin can be reduced from damaging the engine placement surface and the seal surface.
[0029]
Furthermore, when a knock pin for final positioning and a knock pin engagement hole are provided, the guide pin can guide the descent of the engine, and the final positioning of the engine can be performed with the knock pin. Can be improved.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an outboard motor according to the present invention as viewed from the left side.
FIG. 2 is a right side view of an engine and a guide exhaust.
FIG. 3 is a cross-sectional view of the engine as viewed from the right side.
FIG. 4 is an enlarged view of the main part of FIG. 2;
FIG. 5 is a plan view of a guide exhaust in which an oil pump is installed.
FIG. 6 is a plan view of the oil pump.
FIG. 7 is a plan view of the guide exhaust with a gasket attached.
FIG. 8 is a plan view of the gasket.
[Explanation of symbols]
16 Engine 28 Oil pump (equipment)
38 Guide exhaust 51 Engine mounting surface 61 Knock pin 63 Guide opening 68 Knock pin engagement hole 71 Guide pin

Claims (3)

In the outboard motor in which the seal surface on the lower surface of the engine is mounted on the engine mounting surface of the guide exhaust, and the device protrudes above the engine mounting surface and is installed in the guide exhaust.
A guide pin is provided on one of the engine or the guide exhaust, and a guide opening that engages with the guide pin is provided on the other of the engine or the guide exhaust,
The engine is placed on the guide exhaust while engaging the guide pin with the guide opening.
In addition, when the tip of the guide pin is located at the end of the guide opening, the seal surface of the engine should be positioned above the equipment installed in the guide exhaust. A featured outboard motor. 2. The outboard motor according to claim 1, wherein a guide pin or a guide opening provided in the guide exhaust is disposed at a location away from the engine placement surface. One of the engine or the guide exhaust is provided with a knock pin for final positioning, and the other of the engine or the guide exhaust is provided with a knock pin engaging hole for engaging the knock pin,
The outboard motor according to claim 1 or 2, wherein a height of the knock pin is lower than that of the guide pin.

Images