JPS63251395A - Electromotive outboard motor - Google Patents

Abstract

PURPOSE:To simplify the structure, to improve the assembling property, and to suppress the heavy weight, by connecting a casing cover in front of a casing main body which is formed by incorporating a cylinder body and a propeller protective pieces, and fixing the propeller at the end of a rotation shaft which penetrates rearwards. CONSTITUTION:In front of a casing main body 6 which is formed by incorporat ing a cylinder 8 and a propeller protective pieces 9, is connected a casing cover 7 which houses a rotor 13 formed of a magnetic material in a cylinder with bottom. At the end of a rotation shaft 15 which penetrates rearwards through the casing main body 6, a propeller 5 is fixed. As a result, the casing cover 7 acts as a yoke concurrently, and the center of a holding tube 2 and the center of gravity of the electromotive outboard motor can be approached. The number of parts is reduced, the structure is simplified, and the assembling property is improved accordingly. Furthermore, a bending or torsional moment acting on the connection of the holding tube 2 and the casing main body 6 can be reduced, the strength of the holding tube 2 and the casing main body 6 need not be made too large, and the heavy weight of the outboard motor can be curtailed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electric outboard motor used in a small boat.

[Conventional technology]

Electric outboard motors have the advantage of being easy to operate and provide quiet operation, so they are used in small fishing boats and fishing boats for short distances at fishing grounds.

An example of this type of electric outboard motor is the Utility Model 61-179
There is a method disclosed in Japanese Patent No. 200, in which the casing is divided into a casing with a holding tube connected to the front part that houses the motor, and a casing that houses the output shaft that transmits the rotation of the motor to the propeller. It is configured to hold the yoke between the two.

[Problem that the invention seeks to solve]

However, in this structure, in addition to the yoke, two members are required to hold the yoke, which not only increases the number of parts and complicates the structure, but also makes it difficult to assemble. there were. This tendency is particularly noticeable when attaching a propeller protection member, since it is necessary to attach the protection member with screws or the like or by gluing it. Furthermore, a holding tube is connected to the frontmost part of the casing, and a bending moment is applied to this part by the weight of the electric outboard motor itself, and a large torsional moment is applied to this part by an operation that suddenly changes the direction of travel. For this reason, the holding tube and the casing that connects it are required to have sufficient strength, which in turn increases the weight of the electric outboard motor.

[Means for solving problems]

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide an electric outboard motor that has a simplified structure, improves ease of assembly, and is not heavy in weight. In the electric outboard motor according to the present invention, a casing cover formed of a magnetic material in a bottomed cylindrical shape and accommodating a rotor is connected to the front of a casing body in which a cylindrical portion and a propeller protection piece are integrally formed. A propeller is fixed to the end of a rotating shaft that passes through the rear.

[Effect]

In the present invention, since the casing cover also serves as a yoke, the number of parts is reduced. Furthermore, since the electric outboard motor is divided into the front and rear parts of the holding tube, and the center of the holding tube and the center of gravity of the electric outboard motor are brought closer together, the bending moment and torsional moment acting on the connecting portion are reduced.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a sectional view showing the main parts of the electric outboard motor according to the present invention.
The electric outboard motor, which is designated as a whole by reference numeral 1 in the figure, includes a holding tube 2 that is detachably attached to a hull (not shown), a casing 3 connected to the lower end of this holding tube 2, and a holding tube that is connected to the holding tube 2 by this casing 3. Motor 4 located in front of 2
and a propeller 5 disposed behind the holding tube 2. The holding tube 2 is open at both ends, and not only supports the casing 3 on the hull, but also forms a passage for wiring for supplying electric power to the motor 4 and controlling the rotation of the motor 4. Note that the holding tube 2 also has a function as a steering shaft.

The casing 3 consists of a casing body 6 made of an aluminum alloy, and a casing cover 7 made of a magnetic material and connected to the front of the casing body 6 via a sealing material. The casing body 6 is formed into a cylindrical shape with a bottom that is open to the front, and a cylindrical portion 8 to which the holding tube 2 is connected is integrally formed on the upper side, and a propeller protector that protrudes downward and protects the propeller 5 on the lower side. Piece 9 is integrally formed. Casing cover 7
is formed into a bottomed cylindrical shape that is open to the rear by processing, for example, iron material, and a bottomed cylindrical bulge portion 11 that bulges out forward is provided at the center of the bottom.

Reference numeral 12 denotes a bolt that passes through the casing cover 7 from the front in the axial direction and is screwed onto the casing body 6 to attach the casing cover 7.

The motor 4 includes a rotor 13 consisting of an armature housed in a casing cover 7, and a field part 1 fixed to the inner peripheral surface of the casing cover 7 facing the rotor 13.
4, etc., and this field part 14 is connected to the casing cover 7.
together with the stator. That is, the casing cover 7 also functions as a yoke for the motor 4. 1
Reference numeral 5 denotes a rotating shaft passing through the rotor 13 in the axial direction, the front part of which faces into the bulged part 11, and the rear part facing the casing body 6.
It penetrates rearward through a cylindrical bearing portion 16 provided at the bottom of the casing and protrudes outside the casing. It is rotatably supported by a bearing 17 press-fitted into the bulging portion 11 and a bearing 18 press-fitted into the bearing portion 16 . The propeller 5 is fixed to the rear end of the rotary shaft 15 by a pin 19 screwed onto the rear end of the rotary shaft 15 and a pin fixed in front of the screw. On the other hand, a thrust bearing 21 that receives the propulsive force of the propeller 5 is interposed between the front end surface of the rotating shaft 15 and the bulge 11, as shown in FIG. This thrust bearing 21 is constructed by loading a plurality of balls 23 between a disk 22 having an outer diameter larger than the inner hole of the bearing 17 and the bulge 11. That is, the thrust bearing 21 has a simple structure that uses the balls 23, and is combined with the disk 22, so even if the rotating shaft 15 is pulled out, the balls 23, etc.
・There is no chance of it falling off.

Reference numeral 25 denotes two oil seals loaded into the bearing portion 18 from the outside, sealing between the bearing portion 18 and the rotating shaft 15, and preventing water from entering the casing 3. 26 is a brush that supplies power from a power source mounted on the hull to the rotor 13, and 27 is a brush holder that holds the brush 26. 28 consists of, for example, a power transistor,
This is a control component that controls the current flowing through the rotor 13 and its speed, and is housed around the bearing portion 16 in the casing body 6. Therefore, the heat generated by the control component 28 is dissipated into the water via the casing body 6.

Reference numeral 31 denotes a protective cover made of rubber or soft synthetic resin that is placed on the front part of the casing cover 7, and is formed into a substantially hemispherical shell shape with a smooth outer surface. For this reason,
Water flow can be made smooth to reduce resistance, and the casing cover 7 can be protected. This protective cover 31 is formed by screwing together a threaded groove provided on the outer peripheral surface of the bulging portion 11 and a threaded groove provided on the inner peripheral surface of the mounting portion 32 that is crowned by the bulging portion 11. installed on. Incidentally, reference numeral 33 denotes a water drain hole through which water in the protective cover 31 is drained when the electric outboard motor is pulled out of the water.

In the electric outboard motor configured in this manner, the casing cover 7 also serves as the yoke of the motor 4, making it possible to eliminate the yoke, and even with the provision of the propeller protection piece 9, the number of parts does not increase. Therefore, the number of parts can be reduced and the structure can be simplified.

Therefore, after attaching the control part 28 and the brush holder 27 holding the brush 26 to the casing body 6,
The electric outboard motor 1 can be easily assembled by attaching the casing cover 7 containing the rotor 13 with the bolts 12.

Furthermore, the motor 4 and propeller 5, which are heavier components of the electric outboard motor 1, can be placed separately at the front and back of the holding tube 2, and the center of the holding tube 2 and the electric outboard motor The center of gravity of 1 can be brought closer to the center of gravity of 1. Therefore, it is possible to reduce the bending moment that acts on the portion connecting the holding tube 2 and the casing body 6 due to the weight of the electric outboard motor 1, and the torsional moment that acts on the portion that connects the holding tube 2 and the casing body 6 due to an operation that suddenly changes the direction of travel. . As a result, the strength of the holding tube 2 and the casing body 6 is not increased more than necessary, unlike in the conventional case.

〔Effect of the invention〕

As explained above, according to the present invention, at the front of the casing body in which the cylinder part and the propeller protection piece are integrally formed,
The casing cover, which is formed into a bottomed cylindrical shape made of magnetic material and houses the rotor, is connected, and the propeller is fixed to the end of the rotating shaft that passes through the casing body rearward.The casing cover also serves as a yoke, and the holding tube The center can be brought closer to the center of gravity of the electric outboard motor.

Therefore, the number of parts can be reduced and the structure can be simplified, making it easier to assemble. Furthermore, since the bending moment and torsional moment acting on the connecting portion between the holding tube and the casing can be reduced, the strength of the holding tube and the casing is not increased more than necessary, and weight increase can be suppressed.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the main parts of an electric outboard motor according to the present invention;
FIG. 2 is a partially enlarged sectional view. 2...Holding tube, 5...Propeller, 6...Casing body, 7...Casing cover, 8...
・Cylinder part, 9... Propeller protection piece, 13... Rotor, 15... Rotating shaft.

Claims (1)

[Claims] The cylindrical part to which the holding tube is connected and the propeller protection piece are integrally formed in the casing body, and a casing cover formed in a bottomed cylindrical shape made of magnetic material is connected to the front of the casing body, and the rotor is placed inside this casing cover. An electric outboard motor has a propeller fixed to the end of a rotating shaft that extends rearward through the casing body.