JPH0424279B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention belongs to the field of ship propulsion, and is used as a dual-shaft system propulsion shaft for a portion of a small ship exposed to the sea.

(Prior technology) Most of the conventionally used dual-shaft propulsion shafts are intended for large ships such as counters, and their power distribution mechanism is housed inside the ship, so it is difficult to use hydrodynamics. It is a device that transmits only rotational motion without being affected by any influence and can be fixedly positioned, so it cannot be used as is for small ships.

Similarly, prior art technologies such as propulsion devices and contra-rotating propeller drive propulsion shafts that have been proposed for small vessels cannot be simply installed as they are in existing small vessels.

Therefore, under conditions of strict power regulation, those involved in fishing for small vessels have an urgent need to improve propulsion efficiency with the same power, and there has been a demand for a propulsion method that can be easily achieved.

(Problems to be Solved by the Invention) In view of the above circumstances, the present invention provides a propulsion shaft that has been used in the past and raises and lowers the propulsion shaft without requiring major changes or modifications to the propulsion mechanism of a small boat. The aim of the present invention is to easily and economically change to a dual shaft system propulsion shaft by simply replacing a part of the hoisting device. It provides a propulsion shaft with a built-in mechanism.

(Means for Solving the Problems) The propulsion shaft incorporating the power splitting mechanism of the present invention is provided with a terminal end of the power splitting shaft protruding from one end of the bearing body and a rotatable outer fitting on the power splitting shaft in a watertight manner. In a contra-rotating propeller drive propulsion shaft, a propeller is respectively locked to the terminal end of a hollow shaft that projects in a watertight manner, and a power split shaft is connected to the hollow shaft through a bevel gear mechanism inside the bearing body. , the bearing body is joined and formed into three parts, a locking part that connects with the lifting means is arranged on the outer circumferential surface of the intermediate case, and a pair of opposing bevel gears C are rotatable on the inner circumferential surface. One side of the bevel gear C meshes with a bevel gear A that is integrally fitted onto the power splitting shaft and rotatably supported on the inner circumferential surface of the intermediate case, and the other side meshes with a bevel gear A that is rotatably supported on the inner peripheral surface of the intermediate case. The other end of the bearing body has a flange fitted externally to the starting end of the power split shaft. The flange protrudes in a watertight manner, and a fitting shaft end into which the propulsion shaft is fitted is removably connected to the flange.

(Function) According to the above configuration, the fitting shaft end joins the shaft end of the propulsion shaft joined to the existing universal joint, and the locking part is loosely fitted and locked to the locking means of the lifting device. .

(Example) Hereinafter, the present invention will be specifically described based on an example and with reference to the attached drawings. As shown in FIGS. 6, and a left case 8 and a right case 9 bolted from left and right to the intermediate case 6, and the right end (terminus) of the power split shaft 1 protruding from the right end of the bearing body a and the power split shaft 1. As shown in FIG. 3, propellers 11 and 12 are externally fitted to the right end (terminus) of the hollow shaft 5 which is rotatably fitted in a watertight manner and protrudes in a watertight manner as described later.
A locking part 13 consisting of a mountain-shaped protrusion and an engagement hole extending through the protrusion in a direction perpendicular to the axis is provided on the outer circumference of the intermediate case 6 along the axial direction, and a locking part 13 is provided on the inner circumference. A pair of opposing bevel gears C are rotatably supported, and the bevel gears C are keyed and fitted externally to the power split shaft 1 on the left side, and the outer periphery thereof is fitted internally into the bearing 7. It meshes with a bevel gear A rotatably supported on the inner circumferential surface of the intermediate case 6, and on the right side, it is integrally fitted onto a hollow shaft, and its outer circumference is fitted internally into a bearing 7, thereby connecting the inner circumference of the intermediate case 6. meshing with a bevel gear B rotatably supported on the surface to constitute a power splitting mechanism b using the bevel gear;
At the left end of the bearing body a, a flange 2 externally attached to the left end (starting end) of the power split shaft 1 with a key is protruded in a watertight state as described later, and the left case 8 and right case 9 are arranged on the left and right sides, respectively. In addition to positioning the bearing 7, the left case 8 holds the outer circumference of the boss portion of the flange 2 watertight with a seal 10 sealed in its inner circumference, and the right case 9 holds the outer circumference of the boss portion of the flange 2 watertight with a seal 10 sealed in its inner circumference. The outer periphery of the hollow shaft 5 is held watertight, and a boss 4, which is a fitting shaft end, is detachably connected to the flange 2, and has a fitting shaft hole through which the shaft end of the existing propulsion shaft 3 is engaged. It consists of

The propulsion shaft incorporating the power splitting mechanism constructed in this manner is constructed by fitting and fixing the shaft end of the propulsion shaft 3 from which the existing propeller has been removed into the fitting shaft hole of the boss 4, and fixing the boss 4 and the flange 2. The propulsion shaft 3 is connected to the power splitting shaft 1, and the two-pronged locking end of the existing lifting device is swingably connected to the protrusion of the locking part 13 through the engagement hole. Therefore, propeller 1
The positions of 1 and 12 are set by the universal joint 1 by the lifting means such as the hydraulic cylinder of the lifting device.
It can be changed or adjusted so that it can move up and down freely centering on the joint point of universal joint 14 and the locking part 1.
3 and the locking end of the hoisting device, the propulsion shaft is held in its position, and the power supplied from the propulsion mechanism inside the ship is transferred to the power split shaft 1 from the power split shaft 1 to the power split mechanism b. The propellers 11 and 12, which are mounted on the ends of the respective shafts, are driven in such a manner that they rotate in opposite directions. In addition, when the lifting means of the lifting device moves up and down linearly, the locking part 13 must be in a slidable relationship in the axial direction with respect to the bearing body a. As shown in FIG. 4, a rail-shaped guide portion 15 is integrally attached to the outer periphery of the bearing body a (the outer periphery of the intermediate case 6) in the axial direction,
A sliding body c is positioned in the circumferential direction by the guide portion 15, and is slidably fitted onto the outer periphery of the bearing body a, and a bifurcated protrusion (not limited to two prongs) is formed on the upper part of the sliding body c. ) is protruded, and the sliding direction (axis center) is attached to the protrusion.
Another example is a means in which an engagement hole is provided through the hole in a direction perpendicular to the direction.

As described above, in the present invention, the boss 4 (fitting shaft end) having a fitting shaft hole is removably joined to the input side shaft end of the power splitting shaft 1. 3 is easily connected to the power split shaft 1 via the boss 4, and the locking end of the hoisting device is locked to the locking part 13, so it is easy to use the propulsion shaft of an existing small vessel. It can be modified to a dual shaft propulsion shaft.

(Effects of the Invention) As described above, according to the propulsion shaft incorporating the power splitting mechanism of the present invention, an existing propulsion shaft can be replaced with a dual-shaft type propulsion shaft without requiring major modifications to the propulsion mechanism of a conventional small boat. This has the effect of improving propulsion efficiency and reducing fuel consumption, allowing immediate and economical response to power regulations.

[Brief explanation of drawings]

Fig. 1 is a central cross-sectional view of the main part of the propulsion shaft incorporating the power splitting mechanism according to the present invention, and Fig. 2 is a longitudinal cross-sectional view at the mounting position of the bevel gear C in a vertical plane perpendicular to the axial direction. , FIG. 3 is an explanatory view of the case where the present invention is implemented in a small boat, and FIG. 4 is a longitudinal cross-sectional view in a vertical plane orthogonal to the axial direction, showing another embodiment of the locking portion 13. In the figure, 1 is a power split shaft, 2 is a flange, 3 is a propulsion shaft, 4 is a boss, 5 is a hollow shaft, 6 is an intermediate case,
7 is the bearing, 8 is the left case, 9 is the right case,
10 is a seal, 11 and 12 are propellers, 13 is a locking part, and 15 is a guide part. A, B, and C are bevel gears, a is a bearing body, b is a power splitting mechanism, and c is a sliding body.

Claims (1)

[Claims] 1. A propeller is respectively locked to the terminal end of a power split shaft protruding from one end of the bearing body and to the terminal end of a hollow shaft that is rotatably fitted externally to the power split shaft and projects watertightly, and In the contra-rotating propeller drive propulsion shaft, which consists of a power split shaft connected to a hollow shaft via a bevel gear mechanism, the bearing body is joined into three parts, and the outer circumferential surface of the intermediate case is A locking portion that connects with the means is provided, a pair of opposing bevel gears C are rotatably supported on the inner circumferential surface, and the bevel gears C are integrally fitted onto the power splitting shaft on one side. The bevel gear A is rotatably supported on the inner circumferential surface of the intermediate case, and the bevel gear A is integrally fitted onto the hollow shaft and rotatably supported on the inner circumferential surface of the intermediate case. It meshes with the bevel gear B, and a flange externally attached to the starting end of the power split shaft protrudes from the other end of the bearing body in a watertight manner, and the fitting shaft end into which the propulsion shaft is internally fitted can be freely attached and detached to the flange. A propulsion shaft with a built-in power splitting mechanism connected to.