JPH05278686A - Outboard engine - Google Patents

Abstract

PURPOSE:To simplify the internal structure of an outboard engine by integrally forming an oil pan on an undercover forming part of an upper unit in which an engine is received, and forming respective openings of the oil pan, exhaust channel, and cooling-water channel in an aligning undercover face with the engine. CONSTITUTION:An outboard engine has an upper unit 3 in which an engine 2 is accommodated. A drive shaft housing 4 is disposed on a lower end edge of an undercover 3A having an engine loading face for loading the upper unit 3 thereon. In this case, the undercover 3A is integrally formed with an oil pan 8 along the extending direction of a housing 4, which oil pan 8 is made open at its top end so as to have an engine 2 underside loaded thereon. Respective openings of an ascending channel forming a cooling water passage, a return channel, and an exhaust channel are located in corresponding relation to aligning undercover face 15 positions with the engine 2. Those openings are formed correspondingly to respective openings of an ascending channel, a return channel, and an exhaust channel which are formed on the underside of the engine 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outboard motor, and more particularly to an improvement in the structure of an oil pan mounted on the lower side of an engine.

[0002]

2. Description of the Related Art FIG. 8 schematically shows the general structure of an outboard motor which is generally known. In this figure, the outboard motor 1 has an outer appearance composed of an upper unit 3 accommodating an engine 2 and a drive shaft housing 4 arranged on the lower surface side of the upper unit 3. A drive shaft 5 is rotatably supported in the drive shaft housing 4 in the vertical direction, and the upper end side of the drive shaft is the engine 2
On the other hand, the lower end side is connected to a gear mechanism 7 for rotating the screw 6.

An oil pan 8 for storing engine oil is provided at a position below the engine 2 in the drive shaft housing 4, and the oil in the oil pan 8 can perform predetermined lubrication in each part of the engine 2. It has become.

A known structure for supporting the oil pan 8 is shown in FIG. 9, for example. In this support structure, a support plate 9 is provided between the engine 2 and the drive shaft housing 4, and an oil pan formed separately from the support plate 9 is fixed to the lower surface of the support plate 9 in a hanging manner. It is a thing.

As another supporting structure, as shown in FIG. 10, an oil pan 8 is integrally formed with an under cover 3A which constitutes the lower side of the upper unit 3, and an opening 8A which is the upper part thereof is formed. A configuration in which the engine 2 covers is known.

[0006]

However, in the support structure of the oil pan 8 in the conventional example, in the support structure of FIG. 9, since the oil pan 8 and the support plate 9 are separate bodies, At the time of fixing, a proper fixing tool such as a plurality of tightening bolts is indispensable, which not only causes an increase in the number of parts and weight but also requires a fixing work, which causes a problem that workability is poor.

Further, in the support structure shown in FIG. 10, the engine 2 merely acts as a lid of the oil pan 8, and for example, an ascending passage of cooling water from a water pump (not shown) or the engine 2 is used. The exhaust passage must be provided with a different structure. As a means for solving this, for example, an exhaust pipe can be provided in the lower part of the engine 2 and its lower end can be opened to the exhaust chamber in the drive shaft housing 4. However, such a method has a disadvantage that the structure is complicated.

By the way, in the oil pan 8, it is necessary to periodically change the oil or the like in order to maintain the lubricating performance in accordance with the change of the oil stored therein with time, which is shown in FIG. As described above, the oil drain means 10 is provided on the bottom of the oil pan 8 and is configured to allow the oil to be drained.

However, such a structure has a disadvantage in that it is impossible to avoid soiling the tools used by the oil and the hands of the operator with oil when the oil is drained. Moreover, in such a structure, since the bolts and the like are exposed to the outside of the drive shaft housing 4, it is necessary to accurately position the oil discharge means with respect to the hole 4A formed on the drive shaft housing side, which makes assembly work difficult. There is also an inconvenience.

[0010]

SUMMARY OF THE INVENTION The present invention has been made in view of the inconveniences in the above-mentioned conventional example. Therefore, a first object of the present invention is to support an oil pan while effectively utilizing an undercover forming a part of an upper unit. An object of the present invention is to provide an outboard motor that can simplify the internal structure of the outboard motor.

A second object of the present invention is to simplify the structure described above, to facilitate the work of assembling the inside of the outboard motor, and to remove the oil stored in the oil pan. An object of the present invention is to provide an outboard motor that can avoid contamination of tools and the like.

[0012]

In order to achieve the first object, the present invention provides an upper unit for accommodating an engine, a lower unit side of the upper unit, and a driving force of the engine for a screw. In an outboard motor provided with a drive shaft housing for accommodating a drive shaft for transmitting, an oil pan is integrally formed with an under cover forming a part of the upper unit, and an engine is provided in the under cover. The opening of the oil pan and the openings of the exhaust passage and the cooling water passage are formed on the mating surfaces.

In order to achieve the above-mentioned second object, in addition to the above-mentioned structure, the present invention is designed such that an oil discharging means provided in a lower portion of an oil pan is predetermined with a drive shaft housing at a position where it does not interfere with the drive shaft housing. The structure is separated.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In the following description, the same reference numerals will be used for the same or equivalent components as in the conventional example, and the description will be omitted or simplified.

FIG. 1 shows a schematic configuration of this embodiment, and FIG.
Shows an upper surface of an under cover 3A described later, FIG. 3 shows a lower surface of the under cover, and FIG. 4 shows a lower surface of the engine 2. In these drawings, the upper unit 3 of the outboard motor 1 includes an under cover 3A having a mounting surface for the engine 2, and a drive shaft housing 4 is arranged at the lower end edge of the under cover 3A. The drive shaft housing 4 is connected by inserting a bolt from a flange portion (not shown) formed on the upper end edge of the drive shaft housing 4 and screwing the tip of the bolt into the lower surface side of the engine 2. The under cover 3A is sandwiched between the engine 2 and the drive shaft housing 4.

An oil pan 8 is integrally formed on the under cover 3A along the extending direction of the drive shaft housing 4. The upper end of this oil pan 8
The lower surface side of the engine 2 has an opening shape to be mounted, and has a concave vertical cross-sectional shape. In addition, at the bottom of the oil pan 8, the oil discharge means 10 is provided together with the oil discharge hole 4A formed in the side wall of the drive shaft housing 4.
The drain mechanism section 12 constituting the above is provided.

An oil seal 14 through which the drive shaft 5 penetrates is provided on the left side of the under cover 3A in FIG. 1, that is, on the front side. Further, as shown in FIG. 2, at the position of the mating surface 15 with the engine 2, the openings of the ascending passage 16, the return passage 17, and the exhaust passage 18 which form the cooling water passage are located. .. As shown in FIG. 4, each of these openings is provided with an ascending passage 16A and a return passage 17A formed on the lower surface side of the engine 2.
Also, the exhaust passage 18A corresponds to each opening of the exhaust passage 18A, whereby a predetermined passage is formed with the engine 2 mounted on the under cover 3A.

The cooling water introduced into the engine 2 through the ascending passages 16 and 16A is guided by the water tube 20 through a water pump (not shown), and the upper end side of the water tube 20 and the underside. A rubber bush 21 for water sealing is interposed between the cover 3A and the cover 3A (see FIG. 1). The bush 21 is fixed to the lower end of the rising passage 16 as shown in FIG.

Exhaust gas from the engine 2 is discharged into the drive shaft housing 5 through an exhaust tube (not shown) which extends downward from the lower portion of the under cover 3A through the exhaust port 23, and the exhaust gas of the exhaust tube is exhausted. A return passage based on a known technique is formed on the outer side to prevent the inside of the drive shaft housing 5 from being heated, and thus, the oil temperature in the oil pan 8 can be appropriately maintained.

The oil in the oil pan 8 is introduced to the engine 2 side via a pump (not shown) and then circulated through the return hole 24 as shown in FIG.

The detailed structure of the oil discharging means 10 provided on the bottom side of the oil pan 8 is shown in FIGS. In these figures, the bottom portion 8B of the oil pan 8
A bulge 30 is formed on the outer surface as shown in FIG. A screw hole 31 is bored inside the bulging portion 30 in the axial direction, and a drain bolt 32 is mounted in the screw hole 31 so as to be movable back and forth in the axial direction. Further, a drain hole 8C reaching below the screw hole 31 is formed in a part of the bottom portion 8B of the oil pan 8, and the drain bolt 32 is also provided.
A drain passage hole 32A extending in the axial direction is provided in the inside of the. The tip of the drain passage hole 32A is open and communicates with the screw hole 31, and the drain bolt 3
The head side of 2 is provided with a hole 32B bored in the radial direction of the drain bolt 32, and the hole 32B and the drain passage hole 32A communicate with each other.

The head portion of the drain bolt 32 and the drive shaft housing 4 are always positioned at a fixed distance so as not to interfere with each other. 32 heads
It can be exposed to the outside while maintaining a predetermined distance through the oil discharge hole 4A. At this time, the oil drain hole 4
A has a taper shape that expands slightly toward the outside so that no oil flows out into the drive shaft housing 4 when the oil is discharged.

When removing the oil from the oil pan 8, as shown in FIG. 7, after removing the lid 35 (see FIG. 1) that closes the oil discharge hole 4A, the drain bolt 32 is removed by using the socket wrench 36. Loosen. When the drain passage hole 32A and the drain hole 8C provided in the bottom portion 8B of the oil pan 8 are loosened to a position where they communicate with each other, the oil in the oil pan 8 flows into the drain passage hole 32A. At this time, the hole 32B provided in the radial direction is positioned slightly outside the inside of the drain discharge hole 4A, and the hole 32B
The oil discharged from B can be discharged to the outside.

Therefore, according to the above embodiment of the present invention, since the oil pan 8 is formed integrally with the under cover 3A, a plurality of bolts for fixing the two are provided as in the case of the split type. Since the usage can be wiped out, there is an effect that the weight can be reduced by reducing the number of parts and the assembling work can be simplified.

Further, according to the integral formation, there is an advantage that it is not necessary to consider the accuracy of the mating surface of the upper end surface of the oil pan, unlike the case of the split type, and from this viewpoint, cost reduction is expected. can do.

Further, in the undercover 3A, the respective opening surfaces of the oil pan 8, the cooling water passages 16 and 17, and the exhaust port 18 are made to coincide with the mating surface with the engine 2, so that the undercover 3A can be molded easily. , Die cutting is easy and mass production is possible at low cost. From this point, it is possible to manufacture the outboard motor at low cost.

The undercover 3A is used for the engine 2
Since it is firmly fixed in a state of being sandwiched between the drive shaft housing 4 and the drive shaft housing 4, it is possible to sufficiently maintain the sealing property of each passage.

In the oil discharge means 10, the drain bolt 32 and the drain discharge hole 4A are spaced apart from each other so as not to interfere with each other, and the socket wrench 36 can be inserted into the head of the drain bolt 32. If there is a gap, the drain bolt 32 can be loosened to drain the oil without difficulty. At this time, since the socket wrench 32 is used horizontally, there is no possibility of soiling the socket wrench.

Moreover, since there is no contact point between the drain bolt 32 and the oil discharge hole 4A, there is an advantage that workability can be further improved because the necessity of alignment during assembly is eliminated.

In the above embodiment, the structure of each part of the drain discharge means 10 is not necessarily limited to the illustrated structural example, and as described above, the relative relationship between the drain bolt 32 and the drain discharge hole 4A is maintained. Various design changes are possible as long as it is obtained. For example, it is not always necessary to form the bulging portion 30 as a portion where the screw hole 31 is formed, and if the bottom wall thickness of the oil pan 8 is not less than a certain value, the screw hole 31 may be directly formed in the bottom portion. It is possible.

[0031]

Since the present invention is constructed and operates as described above, the structure of the opening of the oil pan, the cooling water passage, and the like is combined with the integrated structure of the undercover and the oil pan. By forming it on the mating surface with the engine, the internal structure of the outboard motor can be simplified, the positioning work between the oil pan and the drive shaft housing is not bothered, and a tool for oil removal is also provided. There is an effect that it is possible to provide an outboard motor that has an unprecedented excellent effect that can avoid the above-mentioned contamination.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an outboard motor according to an embodiment of the present invention with a partial cross section.

FIG. 2 is a top view of an under cover in the embodiment.

FIG. 3 is a bottom view of the under cover in the embodiment.

FIG. 4 is a bottom view of the engine in the embodiment.

FIG. 5 is an enlarged cross-sectional view of the oil discharging means in the above embodiment.

6 is a sectional view taken along the line AA of FIG.

FIG. 7 is an explanatory diagram showing an oil draining method.

FIG. 8 is an external configuration diagram of an outboard motor for explaining a conventional example.

FIG. 9 is an explanatory view showing a conventional oil pan structure.

10 is an explanatory view showing a conventional oil pan structure different from that in FIG. 9. FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outboard motor 2 Engine 3 Upper unit 3A Under cover 4 Drive shaft housing 5 Drive shaft 8 Oil pan 10 Oil discharge means 15 Mating surface 16 Rise passage which constitutes cooling water passage 17 Return passage which constitutes cooling water passage 18 Exhaust passage

Claims (2)

[Claims] 1. An outboard boat having an upper unit for accommodating an engine and a drive shaft housing connected to a lower surface of the upper unit and accommodating a drive shaft for transmitting a driving force of the engine to a screw. In the machine, an oil pan is integrally formed on an undercover that forms a part of the upper unit, and an opening of the oil pan, an exhaust passage, and a cooling water passage are formed on a mating surface of the undercover with the engine. An outboard motor having an opening formed therein. 2. The oil draining means according to claim 1, wherein an oil draining means is provided in a lower portion of the oil pan, and the oil draining means is provided at a position not interfering with the drive shaft housing at a predetermined interval. And outboard motor.