JPS6013757Y2 - Inboard/outboard motor case - Google Patents

Description

[Detailed description of the invention] The present invention relates to a case for an inboard/outboard motor suitable for use in sailboats, etc., and its purpose is to use the installation space of the case extremely effectively and to have a strong structure. To provide a case for an inboard/outboard motor that can improve the cooling effect of lubricating oil within the case.

In order to achieve the above object, the present invention comprises an upper case and a lower case in an inboard/outboard motor case that extends downward from the bottom of the ship and is equipped with a propulsion device at its lower end. A mounting bracket for attaching the inboard/outboard engine case to the engine is removably provided on the front of the head of the upper case, and the mounting bracket is located directly below the forward/reverse switching mechanism inside the upper case and opposite the bottom of the mounting bracket. The neck part is arranged adjacent to a cooling water passage for cooling the engine in the upper case, and reinforcing ribs are formed on the inner circumferential surface of the neck part.

To explain the present invention based on the drawings, in the attached drawing which is a longitudinal cross-sectional view of the inboard/outboard motor (arrow F is the forward direction), the inboard/outboard motor case 1 is composed of an upper case 2 and a lower case 6, and the lower case 6 is composed of an upper case 2 and a lower case 6. It is connected to the lower end of the upper case 2 by a bolt 3 and extends downward through a case insertion hole 5 in the bottom 4 of the ship.

A cylindrical portion 7 that opens forward is formed on the upper front surface of the upper case 2, and a bearing support sleeve 8 is provided inside the cylindrical portion 7.
A mounting bracket 10 fixed to the front surface of the upper case 2 with bolts 9 is fitted to the outside of the front end flange of the sleeve 8.

The mounting bracket 10 is connected to the engine crankcase.

The upper part of the upper case 2 is formed as a head 12 with a large space in which a forward/reverse switching mechanism 11 (described in detail later) can be provided.

2a is a case lid. The case 1 has a head 12 whose rear part is supported by a mounting base 16 on the ship's bottom 4 via an L-shaped bracket 13, anti-vibration rubber 14 and seal flange 15, and whose front part is supported by a mounting bracket 10, an engine and an engine side. It is supported on the bottom 4 of the ship via anti-vibration rubber or the like.

That is, the case 1 and the engine are installed as one unit on the boat bottom 4 via the vibration isolating rubber 14 on the case 1 side and the two vibration isolating rubbers on the engine side.

The installation stand 16 is formed to surround the case 1, and there is a space between the upper surface of the installation stand 16 and the outer peripheral end of the case 1.
An annular seal member 17 for keeping the inside of the hull in a liquid-tight state is attached as follows.

That is, the lower end of the upper case 2 is formed into a brim shape as the flange 1B, and the inner peripheral end of the seal member 17 is located between the annular notch formed on the lower surface of the flange 18 and the upper end of the lower case 6. The outer peripheral end of the seal member 17 is sandwiched between the upper end surface of the installation base 16 and the seal flange 15 fixed to the installation base 16.

The seal flange 15 extends inward and presses the seal member 17 from above, and an annular seal 20 that contacts the outer circumferential surface of the flange portion 18 of the upper case 2 is fitted to the inner circumferential end of the seal flange 15 .

Next, to briefly explain the power transmission mechanism, the upper
In the sleeve 8 at the front of the case 2, an input shaft 21 connected to the crankshaft and having a bevel gear 23 fixed thereon is supported via a bearing 22, and on the rear side of the input shaft 21, the input shaft 21 is vertically opposed to each other. A first transmission shaft 26 on which two bevel gears 24 and 25 are rotatably fitted is supported by the upper case 2 via a bearing 27.

A vertical second transmission shaft 28 directly connected to the first transmission shaft 26 is supported within the lower case 6, and the bevel gear 2
A horizontal propeller shaft 31 operatively connected to the second transmission shaft 28 via 9 and 30 is supported.

32 is a propeller. The input shaft 21 and the first transmission shaft 2
6 is interlocked and connected via a forward/reverse switching mechanism 11 (dog clutch mechanism) consisting of bevel gears 23, 24, 25, a coupling sleeve 33, etc. so as to enable forward/reverse switching.

That is, the bevel gears 25 and 24 for forward and backward movement, which are always meshed with the bevel gear 23 of the input shaft 21, are both rotatable on the first transmission shaft 26, and the coupling sleeve 33 is mounted on the first transmission shaft 26 in a vertical direction. The coupling sleeve 33 is spline-fitted so as to be slidable in the direction, and the coupling sleeve 33 is moved upward or downward by a shift yoke (not shown) engaged with the annular groove 35 of the coupling sleeve 33. is selectively engaged with the engaging portion 24a of the bevel gear 24 or the engaging portion 25a of the bevel gear 25 to switch between forward and backward movement.

Reference numeral 36 denotes a cooling water passage for sending water taken in from the cooling water intake hole 37 to the engine, which communicates from the inside of the lower case 6 to the inside of the upper case 2, and is connected to the engine via a connecting hose or the like.

A constricted neck portion 38 is formed between the head portion 12 of the upper case 2 and the flange portion 18 at the lower end.
A large number of reinforcing vertical ribs 41 and annular horizontal ribs 42 are formed in a lattice pattern on the inner peripheral surface of the neck portion 38 .

Also, lubricating oil is contained in the head 12, neck 38, and lower case 6 (excluding the cooling water passage 36).

As explained above, according to the present invention: (1) Since the constricted neck 38 is formed directly below the case head 12 equipped with the forward/reverse switching mechanism 11, the mounting space of the case 1 can be used effectively. be able to.

That is, since the lower half of the inboard/outboard engine case 1 protrudes into the water, the upper part of the case 1 must be supported by the bottom 4 or the like, but a constricted neck 38 is formed directly below the head 12. Therefore, the space around the neck 38 becomes wider,
Case mounting member, e.g. mounting bracket 10
This makes it easier to attach the anti-vibration rubber 14.

To explain in more detail, a mounting bracket 10 for attaching the inboard/outboard engine case 1 to the engine is removably provided on the front surface of the head 12 of the upper case 2, and directly below the forward/reverse switching mechanism 11 inside the upper case 2. In addition, since the constricted neck part 38 is formed at a position facing the lower part of the mounting bracket 10, a wide space can be secured on the lower side of the mounting bracket 10, and the work of attaching the mounting bracket 10 is extremely facilitated.

(2) Since reinforcing ribs 41 and 42 are formed on the inner peripheral surface of the neck portion 38, high strength and rigidity can be achieved.

In particular, in the case 1 for inboard/outboard motors where the upper end of the case 1 is supported by the bottom 4 etc. and the lower half protrudes into the water, repetitive loads due to engine vibrations and thrust during navigation are directly below the head 12. Although it acts largely on the neck portion 38,
In the present invention, reinforcing ribs 41 and 42 are formed on the inner circumferential surface of the neck portion 38, so there is no risk of cracking due to fatigue failure or the like.

(3) Since the strength can be increased without increasing the thickness of the entire neck portion 38, it can be made lightweight;
Also, material costs can be reduced.

(4) Since the reinforcing ribs 41 and 42 are formed on the inner circumferential surface of the neck portion 38, the contact area between the lubricating oil inside the case 1 and the case 1 is increased, and the cooling effect of the lubricating oil is improved.

Furthermore, since the neck portion 38 is adjacent to the engine cooling water passage 36 in the upper case 2, in addition to the heat dissipation effect by increasing the contact area with the lubricating oil as described above,
It can also be cooled with cooling water, and the cooling effect of the lubricating oil in the inboard/outboard motor case 1 is further improved.

[Brief explanation of drawings]

The drawing is a longitudinal sectional view of the case of the inboard/outboard motor according to the present invention. 1... Case, 11... Forward/forward switching mechanism, 12... Head, 32... Propeller (propulsion device), 38...・Neck, 41, 42...
...Reinforcement ribs.

Claims (1)

[Scope of utility model registration request] In an inboard/outboard motor case that extends downward from the bottom of the ship and is equipped with a propulsion unit at its lower end, the inboard/outboard motor case is made up of an upper case and a lower case, and the inboard/outboard motor is mounted on the front of the head of the upper case. A removable mounting bracket for attaching the case to the engine is provided, and a constricted neck is formed at a position directly below the forward/reverse switching mechanism inside the upper case and opposite the lower part of the mounting bracket, and the neck is attached to the inside of the upper case. A case for an inboard/outboard engine, characterized in that a reinforcing rib is formed on the inner peripheral surface of the neck part adjacent to a cooling water passage for cooling the engine.