JP3139863B2 - Marine propulsion device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the construction of a marine propulsion device used for pleasure boats such as yachts and motor boats and small boats such as small fishing boats.

[0002]

2. Description of the Related Art Hitherto, in a marine propulsion device, a mechanism for passing a propeller shaft below an engine has been known. For example, the technique is described in JP-A-55-140697 and JP-A-55-175599.

[0003]

However, in the above prior art, as a first method, a bearing stand is mounted on the inner surface of a hull as a support structure for a shaft passing below the engine. As a second method, without disposing a bearing stand,
This was the case where there was no place to support the propeller shaft to the stun tube, and the power transmission shaft was directly connected. However, in the case of the first configuration, a space for mounting the bearing stand is required, and there is a problem that the centering operation when the propeller shaft has an angle is difficult. Further, in the case of the second configuration, the critical rotation speed of the power transmission shaft and the whirling motion of the central portion of the shaft occur, so that the shaft has to be shortened. There was a problem that the arrangement was restricted. The present invention is to solve the above-mentioned problems.

[0004]

The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described. That is, from the engine E mounted on the ship,
In a configuration in which power is transmitted to a propeller 3 disposed outside via a propeller shaft 1 passing below the engine E, a bearing base for supporting the propeller shaft 1 is fixed to a member constituting the engine E. Things.

[0005]

Next, the operation will be described. That is, since the long propeller shaft 1 passing below the engine E can be supported by the bearing stands 4 and 5 near the center, the whirling of the long shaft can be prevented. In addition, even when the hull is distorted due to aging or large waves during cruising, the distorted force is not directly applied to the propeller shaft 1, so that the propeller shaft 1 whirls or the mounting portion of the bearing stand is broken. That is no more. Further, the connection work of the propeller shaft 1 directly under the engine can be easily performed.

[0006]

Next, an embodiment will be described. FIG. 1 is a side sectional view showing a state in which an engine E is mounted on a hull 10, and FIG. FIG. 3 is a side view of an embodiment in which two bearing stands 4 and 5 are mounted on a bearing stand mounting portion 7, and FIG. 4 is an embodiment in which a gear box 18 is disposed in front of the engine E away from the engine E. FIG. 5 is an enlarged side sectional view of the front and rear sliding joint 8 portion.

Referring to FIG. The engine E is mounted on the engine room of the hull 10. The positional relationship between the engine E and the propeller shaft 1 is arranged at an angle, and is collectively referred to as a V-shaped drive mechanism. Then, the crankshaft of the engine E is provided with an angle by the bevel gearbox 6 arranged at the front end of the engine E, and the power is transmitted to the portion of the stun tube 20 via the propeller shaft 1 and the universal joint shaft 2. ing. These shafts drive the propeller 3 disposed outside the hull 10.

FIG. 2 and FIG. 3 will be described. The engine E is mounted on a support of the hull 10 via anti-vibration supports 13 and 14. At the front of the engine E, a bevel gear box 6 into which the tip of a crankshaft is fitted is arranged. The output shaft 21 is projected in a direction having an inclination by the helical gear disposed in the bevel gear box 6. The front-rear sliding joint 8 is interposed on the output shaft 21. The front-rear sliding joint 8 can absorb expansion and contraction in the front-rear direction between the output shaft 21 and the propeller shaft 1. A bearing stand 4 for bearing the propeller shaft 1 is provided, and the upper part of the bearing stand 4 is fixed to a bearing stand mounting portion 7 integrally formed on the lower surface of an oil pan 9.

A cross joint 11 is connected to a position immediately after the bearing base 4, and the cross joint 11 is transmitted to a cross joint 12 via a universal joint shaft 2. The shaft in the stun tube 20 is connected to the cross joint 12. In the case of the embodiment shown in FIG. 3, two bearing stands 4 and 5 are arranged on the bearing stand attaching portion 7 on the lower surface of the oil pan 9, and the propeller shaft 1 is configured to support the bearing at two places. The point that the propeller 3 is driven by interposing the cross joint 11, the universal joint shaft 2, and the cross joint 12 at the rear portion of the propeller shaft 1 is the same as the case of FIG.

Next, the embodiment shown in FIG. 4 will be described. In this embodiment, the crankshaft 19 projects forward from the engine E. A gear box 18 is disposed at a position in front of the crankshaft 19, and an output shaft 30 from the gear box 18 is connected to a cross joint 21, a universal joint shaft 20, and a cross joint 22 in FIGS. The front and rear sliding joint 8 and the propeller shaft 1 are connected as in the embodiment of FIG. It is the same in that the two bearing stands 4 and 5 are arranged below the oil pan 9 to support the propeller shaft 1 as bearings.

Referring now to FIG. 5, the structure of the front and rear sliding joint 8 will be described. A spline groove is formed in the front-rear sliding joint 8, and a spline portion at the tip of the propeller shaft 1 is engaged with the spline groove. The propeller shaft thermally expands due to the heat transmitted from the engine E and the heat generated by the bearing of the bearing base, and the propeller shaft is moved backward, thereby absorbing the slidable slippage by absorbing the propeller shaft.

[0012]

As described above, the present invention has the following advantages. That is, since the long propeller shaft 1 passing below the engine E can be supported by the bearing stands 4 and 5 near the center, the whirling of the long shaft can be prevented. In addition, even when the hull is distorted due to aging or large waves during cruising, the distorted force is not directly applied to the propeller shaft 1, so that the propeller shaft 1 whirls or the mounting portion of the bearing stand is broken. That is no more. Further, the connection work of the propeller shaft 1 directly under the engine can be easily performed.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a state where an engine E is mounted on a hull 10. FIG.

FIG. 2 is a side view of an embodiment in which a bearing base mounting portion 7 is provided on an oil pan 9 of an engine E, and one bearing base 4 is mounted on the bearing base mounting portion 7.

FIG. 3 is a side view of an embodiment in which two bearing stands 4 and 5 are mounted on a bearing stand mounting portion 7;

FIG. 4 is a side view of the embodiment in which the gearbox 18 is disposed in front of the engine E away from the engine E;

FIG. 5 is an enlarged side sectional view of the front and rear sliding joint 8;

[Explanation of symbols]

 E engine 1 propeller shaft 2 universal joint shaft 3 propeller 4,5 bearing stand 6 bevel gearbox 7 bearing stand mounting part 8 front and rear sliding joint 9 oil pan 10 hull

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B63H 21/30 B63H 23/34

Claims (1)

(57) [Claims] In a configuration in which power is transmitted from an engine mounted on a ship to a propeller disposed outside via a propeller shaft passing below the engine, a bearing base for supporting the propeller shaft is provided. A marine propulsion device fixed to a member that constitutes the above.