Impeller drive device for cooling pump of electric outboard motor

Abstract

The impeller blades within the impeller housing rotate in only one direction to provide direct water cooling for the motor. [Solution] The impeller drive device for a cooling pump of an electric outboard motor according to the present invention has a gearbox housing (20) provided on an outboard motor body (10), an impeller housing (30) abutted against the right outer surface of the gearbox housing (20) on the outboard motor body (10), a first bevel gear (2) having a first one-way bearing (3) at its center that is closed in the clockwise direction and unwound in the counterclockwise direction, a second bevel gear (5) having a second one-way bearing (4) at its center that is closed in the counterclockwise direction and unwound in the clockwise direction, and a third bevel gear (6) equipped with an impeller shaft (7), and the impeller blades (8) rotate counterclockwise when the propeller shaft (1) rotates in either the clockwise or counterclockwise direction.

Description

[Technical Field]

[0001] The present invention relates to an impeller drive device for a cooling pump of an electric outboard motor. [Background technology]

[0002] Electric outboard motors are powered using electricity, while internal combustion outboard motors are powered using liquid fuel.

[0003] In such electric outboard motors, the rotation direction of the propeller shaft can be controlled by changing an electrical signal applied to the motor. In internal combustion engine outboard motors, the rotation direction of the propeller shaft can be controlled via a clutch and gear device. The cooling pumps of electric outboard motors and internal combustion engine outboard motors are both driven by the rotational force of the propeller shaft. In this case, the cooling pump of an internal combustion engine outboard motor is a pump for cooling the internal combustion engine, and the cooling pump of an electric outboard motor is a pump for cooling the motor.

[0004] On the other hand, if an impeller used in a cooling pump for an internal combustion engine outboard motor is directly applied to an electric outboard motor, the impeller blades may be subjected to an overload and break whenever the rotation direction of the impeller blades changes. That is, the impeller blades installed inside the impeller housing have flexible blades that prevent pressure from escaping during rotation, but every time the impeller blades are rotated in the opposite direction, an overload is applied to the blades, which can cause the blades to break.

[0005] Furthermore, electric outboard motors currently available on the market cannot be cooled by direct water due to impeller problems, and instead use air-cooling or heat exchange systems, which reduce cooling efficiency and are therefore only suitable for small electric outboard motors, not large electric outboard motors.

[0006] Therefore, by rotating the impeller blades in the impeller housing in only one direction, regardless of the direction of rotation of the propeller shaft provided in the propeller drive motor, and cooling the motor with direct water, the impeller blades are not subjected to overload due to reverse rotation, preventing damage. Direct water cooling also improves cooling efficiency compared to air-cooling or heat exchange methods, allowing for greater output, and it is desirable to make this possible even for large electric outboard motors.

[0007] Related prior art literature information includes Registered Patent Publication No. 10-2284213 (publication date: August 3, 2021) titled "Detachable portable water jet propulsion device."

[0008] The "detachable portable water jet propulsion device" according to this prior art document is operated while floating on the water surface.

[0009] However, the above-mentioned "detachable portable water jet propulsion device" is operated while floating on the water surface, and it is not possible to rotate the impeller blades in the impeller housing in only one direction, regardless of the rotation direction of the propeller shaft provided in the propeller drive motor, and to perform direct water cooling of the motor. Summary of the Invention [Problem to be solved by the invention]

[0010] The present invention has been made to solve the above-mentioned problems, and has an object to provide an impeller drive device for a cooling pump of an electric outboard motor that rotates the impeller blades in the impeller housing in only one direction, regardless of the rotation direction of the propeller shaft provided in the propeller drive motor, thereby providing direct water cooling for the motor. [Means for solving the problem]

[0011] A device for driving an impeller for a cooling pump of an electric outboard motor according to the present invention comprises: A device for driving an impeller for a cooling pump of an electric outboard motor includes a gearbox housing (20) provided on an outboard motor body (10), an impeller housing (30) provided on the outboard motor body (10) in contact with the right outer surface of the gearbox housing (20), a propeller shaft (1) provided in a propeller drive motor passes vertically through an intermediate portion of the gearbox housing (20) and the outboard motor body (10), a first bevel gear (2) is connected to an upper portion of the propeller shaft (1) and has a first one-way bearing (3) that is closed clockwise within the gearbox housing (20) and unwound counterclockwise at its center, and a second bevel gear (5) is connected to a lower portion of the propeller shaft (1) and extends from the center to the right. The third bevel gear (6) is connected in such a manner that it has an impeller shaft (7) that penetrates into the gearbox housing (20) and the impeller housing (30) and is located between the right side of the first bevel gear (2) and the right side of the second bevel gear (5) to transmit the rotational force of the first and second bevel gears (2, 5) as a counterclockwise rotational force, and an impeller blade (8) is provided on the right side of the impeller shaft (7) in the impeller housing (30) and rotates counterclockwise as the propeller shaft (1) rotates clockwise or counterclockwise, sucking in water through an inlet (32) provided at the bottom of the impeller housing (30) and discharging it through an outlet (34) provided at the top of the impeller housing (30), thereby performing direct water cooling of the propeller drive motor. [Effects of the Invention]

[0012] In the present invention, the impeller blades (8) in the impeller housing (30) rotate in only one direction, regardless of the direction of rotation of the propeller shaft (1) provided in the propeller drive motor, and direct water cooling of the motor is performed. This prevents the impeller blades (8) from being overloaded by reverse rotation, preventing damage. In addition, direct water cooling improves cooling efficiency compared to air-cooling or heat exchange methods, allowing for higher output, which has the effect of making it possible to realize large electric outboard motors. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a diagram showing an embodiment of an impeller drive device for a cooling pump of an electric outboard motor according to the present invention; DETAILED DESCRIPTION OF THE INVENTION

[0014] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0015] FIG. 1 shows one embodiment of an impeller drive device for a cooling pump of an electric outboard motor according to the present invention, and is composed of a propeller shaft (1), first, second and third bevel gears (2, 5, 6), first and second one-way bearings (3, 4), an impeller shaft (7), impeller blades (8), an outboard motor body (10), a gearbox housing (20), an impeller housing (30), an intake port (32), and an exhaust port (34).

[0016] The present invention will be described in detail as follows.

[0017] In FIG. 1, the present invention is a device for driving the impeller of a cooling pump of an electric outboard motor, in which a gearbox housing (20) is provided on an outboard motor body (10), and an impeller housing (30) is provided in contact with the right outer surface of the gearbox housing (20) on the outboard motor body (10).

[0018] A propeller shaft (1) provided in the propeller drive motor passes vertically through the middle part of the gearbox housing (20) and the outboard motor body (10).

[0019] A first bevel gear (2) having a first one-way bearing (3) in the center that is closed in a clockwise direction and unwound in a counterclockwise direction within the gearbox housing (20) is coupled to the upper part of the propeller shaft (1), a second bevel gear (5) having a second one-way bearing (4) in the center that is closed in a counterclockwise direction and unwound in a clockwise direction is coupled to the lower part of the propeller shaft (1), and a third bevel gear (6) having an impeller shaft (7) coupled in a form that extends from the center to the right and penetrating into the gearbox housing (20) and the impeller housing (30) is positioned between the right side of the first bevel gear (2) and the right side of the second bevel gear (5) to transmit the rotational force of the first and second bevel gears (2, 5) as a counterclockwise rotational force. That is, the first bevel gear (2) can rotate clockwise and the second bevel gear (5) can rotate counterclockwise, so that the impeller shaft (7) always rotates counterclockwise.

[0020] The impeller blades (8) are provided in the impeller housing (30) on the right side of the impeller shaft (7), and rotate counterclockwise when the propeller shaft (1) rotates clockwise or counterclockwise. Water is drawn in through an intake port (32) provided at the bottom of the impeller housing (30) and discharged through an exhaust port (34) provided at the top of the impeller housing (30), thereby providing direct water cooling for the propeller drive motor.

[0021] By realizing the impeller drive device for a cooling pump of an electric outboard motor according to the present invention, it is possible to use impeller blades for internal combustion engines, which are widely available on the market and inexpensive, as they are.

[0022] In the present invention, the impeller blades 8 in the impeller housing 30 are rotated in only one direction, regardless of the direction of rotation of the propeller shaft 1 provided in the propeller drive motor, and direct water cooling of the motor is performed. This prevents the impeller blades 8 from being overloaded by reverse rotation and damage. In addition, direct water cooling improves cooling efficiency compared to air-cooling or heat exchange methods, allowing for higher output, which has the advantage of making it possible to realize large electric outboard motors.

[0023] Although the technical concept of the present invention has been described above with reference to the accompanying drawings, this is merely an illustrative description of a preferred embodiment of the present invention and is not intended to limit the present invention. Furthermore, it will be apparent to those skilled in the art that various modifications can be made without departing from the scope of the technical concept of the present invention. [Explanation of symbols]

[0024] 1 propeller shaft 2, 5, 6 1st, 2nd, 3rd bevel gears 3, 4 First and second one-way bearings 7 Impeller shaft 8 impeller blades 10 Outboard motor body 20 Gearbox housing 30 Impeller housing 32 Intake port 34 Outlet

Claims

1. A device for driving an impeller for a cooling pump of an electric outboard motor, the device comprising: a gearbox housing (20) provided on an outboard motor body (10); and an impeller housing (30) provided on the outboard motor body (10) in contact with a side surface of the gearbox housing (20), the device comprising: A propeller shaft (1) provided in a propeller drive motor passes vertically through a middle portion of the gearbox housing (20) and the outboard motor body (10), A first bevel gear (2) is coupled to the upper part of the propeller shaft (1) in the gearbox housing (20), the first bevel gear (2) being closed in a clockwise direction and having a first one-way bearing (3) being unwound in a counterclockwise direction at its center. A second bevel gear (5) is coupled to the lower part of the propeller shaft (1), the second bevel gear (5) being closed in a counterclockwise direction and having a second one-way bearing (4) being unwound in a clockwise direction at its center. A third bevel gear (6) is coupled to the gearbox housing (20) in a manner extending from its center toward the impeller housing (30), and includes an impeller shaft (7) penetrating through the gearbox housing (20) and the impeller housing (30). The third bevel gear (6) is positioned between the first bevel gear (2) and the second bevel gear (5) to transmit the rotational force of the first and second bevel gears (2, 5) as a counterclockwise rotational force.

1. An impeller drive device for a cooling pump of an electric outboard motor, wherein impeller vanes (8) are mounted on the impeller shaft (7) within the impeller housing (30), and rotate counterclockwise when the propeller shaft (1) rotates clockwise or counterclockwise, drawing in water through an intake port (32) provided at the bottom of the impeller housing (30) and discharging it through an outlet port (34) provided at the top of the impeller housing (30), thereby providing direct water cooling for the propeller drive motor.

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