Outboard motor

a technology of drive unit and propeller, which is applied in the direction of outboard propulsion unit, marine propulsion, vessel construction, etc., can solve the problems of difficult operation of drive unit, propeller striking underwater tree stumps, and special skill, so as to reduce the drag force acting on the propeller, avoid damage to the propeller, and increase speed and efficiency

Inactive Publication Date: 2007-05-31
PROVOST BRIAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

Enhances speed and efficiency by reducing drag and protecting the propeller from damage, while improving maneuverability and control in challenging water conditions.

Problems solved by technology

In Such cases, the conventional outboard drive unit becomes almost useless, especially if vegetation wraps around the rotating portion of the propeller shaft or when the propeller shaft encounters particularly viscous or hard obstacles.
There also exists a possibility of the propeller striking an underwater tree stump with a disastrous result.
However, these types of drive units are difficult to operate and require special skill.

Method used

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Examples

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Embodiment Construction

[0025] Turning now to the drawings in more detail, numeral 10 designates the outboard drive unit of the present invention. The outboard motor 10 comprises an upper unit, or power head 12, a drive shaft housing 14 and a lower unit 16. The power head 12 includes an internal combustion engine (not shown) of a conventional design, for instance and inline two-cylinder motor that operates on a four-stroke combustion principle.

[0026] Similarly to conventional engines, the engine employed in the design of the present invention has reciprocating cylinders moving within combustion chambers and moving a crank shaft or drive shaft. The drive shaft transmits rotational force to the lower unit 16 through an input shaft 20.

[0027] The engine 12 is connected to a fuel supply system (not shown) that supplies a fuel charge to the combustion chambers to allowing damning of the fuel an exhaust of gases out of the combustion chambers. Although not shown, it is within the knowledge of those skilled in t...

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Abstract

An outboard drive unit for a watercraft to allow propulsion of the watercraft in mud and water. The drive unit has a reduction gear assembly mounted between a motor and a propeller assembly, thereby allowing an engine of given capacity to turn a propeller with increase pitch and surface plane area. A propeller shaft is oriented at an obtuse angle in relation to an input shaft extending from the motor to allow the watercraft to accelerate easier, especially in mud conditions, while protecting the propeller from impact with grass and under water obstructions.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application is a continuation of my co-pending application Ser. No. 11 / 156,184 filed on Jun. 20, 2005, which is a continuation of application Ser. No. 10 / 389,157 filed on Mar. 14, 2003, entitled “Outboard Motor,” now U.S. Pat. No. 6,921,305, the full disclosures of which are incorporated by reference herein and priority of which is hereby claimed.BACKGROUND OF THE INVENTION [0002] This invention relates to outboard drive units and, more particularly, to a drive unit for use with a watercraft, such as a pleasure boat. [0003] Conventional marine outboard drive units are supported on a transom of a boat and can be tilted about a horizontal tilt axis. When required for storage, servicing or repair, the drive units are tilted upward to raise the units above the water surface. There is no intermediate tilting position during operation of a watercraft; conventional outboard motors are submerged during operation below the water surface. [0...

Claims

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Application Information

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Patent Type & AuthorityApplications(United States)
IPC IPC(8): B63H20/32B63H5/16B63H20/14
CPCB63H1/18B63H5/125B63H20/10B63H20/32B63H20/34B63H2001/185
InventorPROVOST, BRIAN
OwnerPROVOST BRIAN