JPH01262286A - Propeller driver for ship propulsion machinery - Google Patents

Abstract

PURPOSE:To prevent a bolt from being exposed in a water flow as well as to secure a smooth external profile by attaching a cover to the outer end of a cap attached to an opening around a propeller shaft at a casing rear face, and setting the clamp bolt within the range covered with a propeller boss. CONSTITUTION:A propeller shaft 20 being driven via a vertical drive shaft 19 and transmission gear mechanisms 23-25 is attached to an opening 16B of a casing 16 via of a casing 16 via a cap with a bearing housing part 35A and a mounting part 35B. A cover 41 with an outer curved surface leading to a boss part 39 of a propeller 18 is attached to an outer end face of the mounting part 35B of the cap 35, and a clamp bolt 42 for the mounting part 35B of the cap 35 is set within the range covered with the propeller boss part 39 for installation. A head part of the clamp bolt is in no case exposed in a flow of water running on an outer surface of the casing, thus a smooth external profile is securable.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a propeller drive device for a marine vessel propulsion device such as an outboard motor or an inboard/outboard motor.

[Background Art] Generally, in outboard motors and inboard/outboard motors, a propeller drive device that drives a propeller using engine output is disposed in a casing. A propeller drive device is configured mainly of a drive shaft disposed on the engine side, a propeller shaft including a propeller, and a gear train connecting the drive shaft and the propeller shaft.

In the above propeller drive device, a cap is attached to an opening formed around the propeller shaft on the rear surface of the casing, and the propeller shaft is supported by a bearing held by the cap. Here, the cap is attached to the rear surface of the casing with a mounting bolt.

[Problems to be Solved by the Invention] However, in the conventional propeller drive device, the mounting bolt of the cap is set at the outer circumference of the propeller boss portion on the rear surface of the casing. Therefore, the head of the mounting bolt is directly exposed to the water flowing on the outer surface of the casing. Therefore, the water flow around the casing is disturbed near the propeller, impeding propulsion efficiency.

An object of the present invention is to prevent disturbance of water flow around a casing caused by the head of a cap mounting bolt, and to improve propulsion efficiency.

[Means for Solving the Problems] As set forth in claim 1, the present invention includes a casing, a drive shaft vertically installed inside the casing, a drive shaft supported by a lower part inside the casing and protruding rearward, A propeller shaft with a propulsion propeller on its rear protrusion, and a gear housing chamber inside the casing through an opening formed around the propeller shaft on the rear surface of the casing, connecting the drive shaft and propeller shaft. A propeller drive for a marine propulsion device, comprising: a gear train that supports a propeller shaft; and a cap that is equipped with a bearing for supporting a propeller shaft and that is attached with a mounting bolt around the opening on the rear surface of a casing! In the II device, a cover is attached to the outer end surface of the cap that smoothly follows the external profile on the rear side of the casing and covers the head of the mounting bolt of the cap, and the sub-mounting bolt that attaches this cover to the cap is attached to the propeller. It is designed to be set within the area covered by the boss portion.

The present invention also provides a casing, a drive shaft vertically installed inside the casing, a drive shaft supported by a lower part inside the casing and protruding rearward, and a propulsion propeller attached to the rear protrusion. A propeller shaft comprising a propeller shaft, and a gear storage chamber inside the casing through an opening formed around the propeller shaft on the rear surface of the casing.
A marine propulsion device comprising: a gear train connecting a drive shaft and a propeller shaft; and a cap that includes a bearing for supporting the propeller shaft and is mounted around the opening on the rear surface of the casing with mounting bolts. In the propeller drive device, the mounting bolt of the cap is set within a region covered by the propeller boss portion.

[Operation J In the invention described in claim 1.2, the rotational force of the drive shaft is transmitted to the propeller shaft via the gear train to drive the propeller.

According to the invention as claimed in claim 1, the heads of the mounting bolts of the cap are covered by the cover, and the heads of the sub-mounting bolts of the cover are covered by the propeller boss. The outer surface of the casing is not directly exposed to the flowing water flow, so the outer surface profile of the casing, together with the cover, can form a continuous and smooth profile up to the vicinity of the propeller.

Further, according to the second aspect of the invention, the head of the mounting bolt of the cap is covered by the propeller boss and is not directly exposed to the water flow flowing on the outer surface of the casing. The profile can form a continuous, smooth fill to the vicinity of the propeller.

In addition, in the invention set forth in claim 1, even when the mounting bolt position of the cap is set around the outer circumference of the propeller boss portion, the mounting bolt can be covered with the cover.

Therefore, under design conditions that minimize propulsion resistance by making the projection size in the propulsion direction of the gear storage chamber forming part (torpedo part) of the casing approximately concave with the size of the propeller boss part, the cap size is made larger than the size of the propeller boss part. This allows the size of the opening on the rear surface of the casing into which the cap is attached to be as large as possible. This means that the capacity of the gear train loaded into the gear storage chamber from the opening can be increased, and as a result, it is possible to cope with increased output of propulsion performance while preventing the turbulence of water flow around the casing as described above. This means that propulsion efficiency can be improved.

[Example] Fig. 1 is a cross-sectional view showing the main part of the first embodiment of the present invention, and the second
The figure is a perspective view showing the main part of Fig. 1, and Fig. 3 is a perspective view showing the main part of Fig. 1.
FIG. 4 is a cross-sectional view showing the main parts of the embodiment, and a schematic diagram showing the outboard motor.

As shown in FIG. 4, the outboard motor io has a clamp bracket 12 fixed to the hull 11.
A swivel bracket 14 is tiltably supported via a tilt shaft 13, and a steering shaft 1 is attached to the swivel bracket 14.
5, the propulsion casing 16 is rotatably supported.

The propulsion casing 16 includes an engine 17 and a propulsion propeller 18, and a propeller drive device that drives the propeller 18 by the output of the engine 17 is connected to the casing 1.
It is located at 6. The propeller drive device is composed of a drive shaft 19 disposed on the engine side, a propeller shaft 2° including a propeller 18, and a forward/reverse switching gear train 21 connecting the drive shaft 19 and the propeller shaft 2o. ing.

The drive shaft 19 is installed vertically inside the casing 16, and its upper end is directly connected to the crankshaft 22 of the engine 17, and its lower end is connected to a forward/reverse switching gear train 21 in a gear storage chamber 16C, which will be described later.

That is, a gear 23 is provided at the lower end of the drive shaft 19, and a forward gear 24 and a reverse gear 25 are both meshed with this gear 23.

The propeller shaft 20 is connected to the casing 16 as shown in FIG.
The propeller 18 is supported by a lower part of the inside of the propeller and protrudes rearward, and a propeller 18 is provided on the rear protrusion. The forward gear 24 and the reverse gear 25 are loosely fitted to the propeller shaft 20, and a dog clutch 26 spline-coupled to the propeller shaft 2o at a position between the forward gear 24 and the reverse pawl 25 connects the forward gear 24. Or, by meshing with either of the reverse gears 25, the rotational force for either forward or backward movement is applied to the propeller shaft 20.
is transmitted to.

Note that 27 is a shift rod for forward/reverse switching operation, a shift lever 28 is provided at the upper end of the shift loft 27, and a shift cam 29 is provided at the lower end of the shift rod 27. 3o is a driven body driven by the shift cam 29, and the dog clutch 26 is connected to this driven body 30 via a connecting rod 31. That is, when the shift cam 29 is rotated by operating the shift lever 28, the driven body 30 moves linearly, and as a result, the dog clutch 26 is moved to the forward gear 24 or the reverse gear 25.
It becomes possible to engage with the

By the way, the aforementioned gears 23, 24, and 25 constitute a forward/reverse switching gear train 21, and these gear trains 21 are connected to an opening 16B formed around the propeller shaft in the rear surface 16A of the casing.
It is inserted into the gear housing chamber 16c inside the casing 16 and arranged as described above.

Further, the propeller shaft 20 includes a bearing 32 fitted to the boss portion of the forward gear 24, a bearing 33 fitted to the boss portion of the reverse gear 25, and a bearing directly inserted to the propeller shaft 20. 34 is supported on the casing 16. Here, although the bearing 32 is held directly by the casing 16, the bearings 33 and 34 are held by the bearing housing portion 35A of the cap 35.

The cap 35 is attached through the opening 16B of the casing 16, and its attachment portion 35B is attached around the opening 16B.
can be attached using the mounting port 36. The mounting port 36 is a port with a hexagonal hole, and is provided so as to be embedded in the outer end surface of the cap 35. The cap 35 is connected to the gear housing chamber 16
A seal member 37 is interposed between the propeller 16 and the casing 16 on the C side, and a seal member 38 is interposed between the propeller shaft 20 and the propeller 18 side. As a result, the cap 35 opens into the gear housing chamber 16C, which is filled with lubricating oil.
is isolated from the exhaust passage 16D of the casing 16. Note that the cap 35 forms an exhaust passage 35C between the bearing housing portion 35A and the mounting portion 35B.

The propeller 18 has a boss portion 3 fixed to the propeller shaft 20.
9 and a wing portion 40. Note that an exhaust passage 39A is formed in the boss portion 39 so that the exhaust gas of the engine 17 can be discharged into the water.

As shown in FIGS. 1 and 2, on the outer end surface of the cap 35, there is a cover 41 that smoothly extends to the outer profile of the rear surface 16A of the casing and covers the head of the mounting port 36 of the cap 35. is covered.

A sub-attachment port 42 for attaching this cover 41 to the propeller 35 is set within a region covered by the boss portion 39 of the propeller 18 (in this embodiment, within a region of the boss portion 39 facing the exhaust passage 39A). There is.

Next, the operation of the first embodiment will be explained.

In the first embodiment, the rotational force of the drive shaft 19 is transmitted to the propeller shaft 20 via the forward/reverse switching gear train 21 to drive the propeller 18.

According to the above embodiment, the head of the attachment port 36 of the cap 35 is covered by the cover 41, and the head of the sub-attachment port 42 of the cover 41 is covered by the propeller boss portion 39. .42 is not directly exposed to the water flow flowing over the outer surface of the casing 16, therefore the outer surface profile of the casing 16 is similar to that of the cover 4.
1, it is possible to form a continuous smooth profile (blade shape) up to the vicinity of the propeller.

In the above embodiment, the mounting port 36 of the cap 35 is covered with the cover 41 while the mounting port 36 of the cap 35 is set around the outer circumference of the propeller boss portion 39. Therefore, the projected size in the propulsion direction of the gear housing chamber forming portion (torpedo portion) of the casing 16 is
9 and the design condition where the propulsion resistance is kept as small as possible by a substantially concave shape, the size of the cap 35 is made larger than the size of the propeller boss portion 39, and thereby the cap 3
The size of the opening in the rear surface 16A of the casing where the casing 5 is attached can be made as large as possible. This means that the capacity of the gear train 21 loaded into the gear storage chamber 16C from the opening 16B can be increased, and as a result, the turbulence of the water flow around the casing 16 can be increased while responding to the high output of propulsion performance. This means that it is possible to prevent this and improve propulsion efficiency.

The second embodiment shown in FIG. 3 differs from the first embodiment described above in that the cover 41 and sub-mounting port 42 in the first embodiment are
The mounting port 52 for attaching the cap 51 to the rear surface 16A of the casing without using a It's what I did.

Even in this second embodiment, the head of the attachment port 52 of the cap 51 is covered by the propeller boss 39 and is not directly exposed to the water flow flowing on the outer surface of the casing 16. The 16 external profiles can form a continuous smooth profile (blade shape) up to the vicinity of the propeller.

[Effects of the Invention] As described above, according to the invention as set forth in claim 1, the head of the attachment bolt of the cap is covered by the cover, and the head of the sub-attachment bolt of the cover is covered by the propeller boss. The heads of both bolts are not directly exposed to the water flow flowing on the outer surface of the casing, so that the outer surface profile of the casing, together with the cover, can form a continuous and smooth profile up to the vicinity of the propeller.

Further, according to the second aspect of the invention, the head of the mounting bolt of the car 2 is covered with the propeller boss and is not directly exposed to the water flow flowing on the outer surface of the casing.
Therefore, the outer surface profile of the casing can form a continuous and smooth profile up to the vicinity of the propeller.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the main parts of the first embodiment of the present invention, and FIG.
The figure is a perspective view showing the main part of Fig. 1, and Fig. 3 is a perspective view showing the main part of Fig. 1.
FIG. 4 is a cross-sectional view showing the main parts of the embodiment, and a schematic diagram showing the outboard motor. DESCRIPTION OF SYMBOLS 10... Outboard motor (ship propulsion machine), 16... Propulsion casing, 16A... Casing rear surface, 16B... Opening, 16C... Gear storage chamber, 18... Propeller. ■9...Drive axis. 20... Propeller shaft, 21... Gear train. 33.34...Bearing, 35...Cap, 36...Mounting bolt, 39...Boss part. 41...Cover, 42...Sub mounting bolt. 51...Cap, 52...Mounting bolt. Agent Patent Attorney Osamu Shiokawa Figure 4

Claims (2)

[Claims] (1) A casing, a drive shaft installed vertically inside the casing, a propeller shaft that is supported by a lower part inside the casing and projects rearward, and has a propulsion propeller on its rear projection, and a propeller shaft on the rear surface of the casing. A gear train is inserted into a gear storage chamber inside the casing through an opening formed around the casing, and includes a gear train connecting a drive shaft and a propeller shaft, and a bearing for supporting the propeller shaft.
A propeller drive device for a marine propulsion device comprising: a cap mounted around the opening on the rear surface of the casing with a mounting bolt; a cover that covers the head of the mounting bolt;
A propeller drive device for a marine propulsion device, characterized in that a sub-mounting bolt for attaching the cover to the cap is set within an area covered by a propeller boss. (2) A casing, a drive shaft installed vertically inside the casing, a propeller shaft that is supported by a lower part inside the casing and projects rearward, and has a propulsion propeller on its rear projection, and a propeller shaft on the rear surface of the casing. A gear train is inserted into a gear storage chamber inside the casing through an opening formed around the casing, and includes a gear train connecting a drive shaft and a propeller shaft, and a bearing for supporting the propeller shaft.
In a propeller drive device for a marine propulsion device, the cap is attached around the opening on the rear surface of a casing with a mounting bolt, and the mounting bolt of the cap is set within an area covered by a propeller boss. A propeller drive device for a marine propulsion device featuring: