JPH0754076Y2 - Outboard motor propeller structure - Google Patents

Description

The present invention relates to an outboard motor propeller structure.

2. Description of the Related Art FIGS. 12 and 13 show a conventional structure in which a male spline 4 is formed at the end of a propeller shaft 3 projecting from a gear case 2 at the lower end of an outboard motor main body 1 and A small-diameter screw portion 5 is formed on the terminal. Reference numeral 7 denotes a sleeve member having a female spline 8 in a substantially rear half portion of the inner periphery thereof, which is spline-engaged with the propeller shaft 3, and an annular stopper 9 for positioning a cushion member 16 described later on the outer periphery of the tip portion thereof.
Has been formed. Reference numeral 10 denotes a propeller body, which is composed of an outer hub 11 having wings 12 and an inner hub 14 concentrically formed integrally with the outer hub 11 via a plurality of ribs 13, and a rear end of the inner hub 14. An annular stopper 15 for positioning the cushion member 16 is integrally formed on the inner circumference of the portion. This propeller body 10 has its inner hub 14 attached to the sleeve member 7,
Cushion member 16 positioned between the stoppers 9 and 15
It is fitted and arranged via. Reference numeral 17 is a positioning washer that engages with the tapered portion 3a of the propeller shaft 3, and 18 is a female spline.
With a retaining washer that has 19 and is spline-engaged with the rear end of the propeller shaft 3, the grooved nut 20 is fastened to the threaded portion 5 at the rear side of this retaining washer 18, and the split pin
By fixing the groove 21 of the grooved nut 20 and the hole 6 of the screw portion 5 with 22 to prevent rotation, the sleeve member 7 and the propeller body 10 are assembled between the washers 17 and 18. By interposing the cushion member 16 between the sleeve member 7 and the inner hub 7 of the propeller body 10 as described above, the rotational force of the sleeve member 7 that rotates integrally with the propeller shaft 3 is
It can be transmitted to the propeller body 10 via the cushion member 16, and when the blade 12 comes into contact with driftwood or the like and rotation of the propeller body 10 is about to be blocked, the cushion member 16 shears, By preventing the rotation of the sleeve member 7 from being transmitted to the propeller body 10, the propeller body 10 and the drive system are protected from the impact at the time of contact. This similar structure is disclosed, for example, in JP-A-59-70295.
JP-A-59-171789 and the like.

Problems to be Solved by the Invention As described above, once the cushion member 16 is sheared, slippage occurs between the sleeve member 7 and the inner hub 14, and the propeller shaft 3 and the sleeve member 7 run idle, causing the propeller body 10 to move. Since it will not rotate, you will have to replace it with a spare propeller if you try to continue onward. Further, apart from such a problem, since the rear end shape of the propeller body 10 is a shape cut perpendicular to the propeller shaft 3,
When moving forward, turbulent flow easily occurs at the rear end of the propeller body 10,
Propulsion resistance tends to increase due to the generation of negative pressure due to this turbulent flow. Therefore, the present invention can avoid the occurrence of turbulence at the rear end of the propeller body during forward movement, and
Even if the cushion member is broken, the propeller shaft and the propeller body can be easily directly connected to each other to provide a propeller structure for an outboard motor that does not hinder navigation.

Means for Solving the Problems According to the invention of claim 1, a propeller body including an outer hub having wings formed therein and an inner hub connected to the outer hub; a sleeve member engaging with a propeller shaft; In a propeller structure for an outboard motor, which includes a cushion member interposed between the hub and the sleeve member and capable of transmitting the rotational force of the propeller shaft to the propeller body, and a fixing means for fixing the propeller body at a predetermined position, At the end portion of the propeller shaft between the inner hub and the fixing means, a rectifying member that prevents the generation of turbulent flow at the rear portion of the propeller body is removably disposed, and a concave or convex shape is formed at the end portion of the propeller body. Forming the engaged part,
While forming a spline that engages with the propeller shaft on the inner periphery of the rectifying member, a rectifying portion that prevents the generation of the turbulent flow is formed on at least a part of the outer periphery of the rectifying member, and at least the rectifying member is formed. The rear part is provided with a convex engagement part that is engaged and fixed to the engaged part of the propeller body when the rectifying member is attached to the propeller shaft in the reverse direction.

According to another aspect of the present invention, there is provided a propeller body including an outer hub having wings and an inner hub connected to the outer hub, a sleeve member engaging with a propeller shaft, and the inner hub and the sleeve member. In a propeller structure of an outboard motor having a cushion member interposed in the propeller shaft and capable of transmitting the rotational force of the propeller shaft to the propeller body, and a nut for fixing the propeller body to a predetermined position, the propeller shaft is engaged with the propeller shaft on the inner periphery. A straightening member having a mating spline and a substantially conical surface that tapers toward the rear side of the outboard motor is provided on the outer periphery, and the straightening member is attached to and detached from the propeller shaft end portion between the inner hub and the nut. While installing as possible, at the end of the propeller body,
When the rectifying member is attached in the reverse direction, the rectifying member is in close contact with at least a part of the substantially conical surface of the rectifying member,
There is a recess to be fixed.

According to a third aspect of the present invention, there is provided a propeller body including an outer hub having wings formed therein and an inner hub connected to the outer hub, a sleeve member engaging with a propeller shaft, and the inner hub and the sleeve member. In a propeller structure of an outboard motor having a cushion member interposed in the propeller shaft and capable of transmitting the rotational force of the propeller shaft to the propeller body, and a nut for fixing the propeller body to a predetermined position, the propeller shaft is engaged with the propeller shaft on the inner periphery. A straightening member having a mating spline and having blades twisted in the same direction as the propeller body is provided on the outer periphery, and the straightening member is detachably attached to the propeller shaft end portion between the inner hub and the nut. At the end of the propeller body, there is provided a locking piece that is engaged and fixed in the circumferential direction with the blade of the rectifying member when the rectifying member is attached in the reverse direction.

In the case of the first aspect of the invention, when the rectifying member is properly mounted, the rectifying portion prevents the turbulent flow from being generated at the rear portion of the propeller body during forward movement. When the cushion member interposed between the sleeve member and the inner hub is sheared and the rotational force is no longer transmitted from the sleeve member to the propeller body, the rectifying member is attached in the front-rear direction to reverse the rectifying member. The engaging part engages with the engaged part of the propeller body,
The propeller body is directly connected to the propeller shaft.

In the case of the invention of claim 2, when the flow straightening member is properly mounted, the flow of water at the rear part of the propeller body is made smooth by the action of the substantially conical surface during forward movement, and the occurrence of turbulence is avoided. When the cushion member is sheared, the rectifying member is attached in the reverse direction so that the substantially conical surface of the rectifying member engages with the recess of the propeller body, and the propeller body is directly connected to the propeller shaft.

According to the third aspect of the present invention, when the flow straightening member is properly attached, water flows inward from the rear end of the propeller main body by the action of the blades of the flow straightening member that are twisted in the same direction as the propeller main body during forward movement. Prevents entrapment and avoids turbulence. When the cushion member is sheared, the blade of the rectifying member is engaged with the locking piece of the propeller body by attaching the rectifying member in the front-rear direction, and the propeller body is directly connected to the propeller shaft.

Embodiment Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

1 to 3, the propeller shaft 3 has a male spline 4 at its rear end and a small-diameter screw portion 5 at its end,
The sleeve member 7 has a female spline 8 formed in the latter half of its inner circumference, and is engaged with the propeller shaft 3 by spline engagement so as to rotate integrally with the propeller shaft 3. The propeller body 10 is provided with blades 12. And an inner hub 14 formed concentrically with the outer hub 11 by a plurality of ribs 13 and positioned by the stoppers 9 and 15 between the inner hub 14 and the sleeve member 7. Cushion member
The basic structure is the same as the above-mentioned conventional one, such that it is assembled with 16 interposed and the rotational force of the sleeve member 7 is transmitted through the cushion member 16.

Here, at the rear end of the propeller shaft 3, the propeller body is
10 A rectifying member 25 for preventing the generation of turbulence at the rear is attached. The rectifying member 25 has a female spline 27 formed on the inner periphery thereof, and is adapted to rotate integrally with the propeller shaft 3 by spline engagement with the rear end portion of the propeller shaft 3. Positioning is performed by a grooved nut 20 which is a fixing means fixed by 22.

The rectifying member 25 of this embodiment is formed in a substantially truncated cone shape,
The outer peripheral surface is formed so as to be gradually tapered toward the rear side of the outboard motor. The substantially conical surface 50 on the outer periphery of the rectifying member 25 serves as a rectifying portion that smoothes the flow of water in the rear portion of the propeller main body 10 when the rectifying member 25 is properly engaged and fixed to the propeller shaft 3, and the rectifier is provided. A part of the member 25 that protrudes in a tapered shape toward the rear side of the outboard motor serves as an engaging portion 26. Furthermore, the large diameter portion of the flow regulating member 25 is formed to be the same as the outer diameter of the inner hub 14, and the propeller shaft 3 of the flow regulating member 25 is formed.
When the nut 20 is properly positioned at the rear end portion, the end surface on the large diameter portion side is in sliding contact with the end surface of the inner hub 14. On the other hand, at the rear end of the inner hub 14,
a is formed, and the rear end face thereof is a substantially conical recess 28 that is an engaged portion that matches the engaging portion 26 of the rectifying member 25 and closely contacts and engages with the engaging portion 26 on the peripheral surface. Has been formed.

According to the above-described structure of the embodiment, since the rear part of the propeller body 10 has a streamlined shape due to the attachment of the rectifying member 25 in a normal navigation state, the flow of water becomes smooth and the turbulent flow occurs in the rear part of the propeller body 10. Will never occur. The cushion member 16 is sheared due to contact of driftwood with the wings 12,
When slippage occurs between the sleeve member 7 and the inner hub 14, as shown in FIGS.
It is attached to the rear end portion in the reverse direction, and the engaging portion 26 of the rectifying member 25 is fitted into the concave portion 28 of the rear end surface of the inner hub 14 to be in close contact therewith. Due to this reverse arrangement of the flow regulating member 25, the rotational force of the flow regulating member 25 that rotates integrally with the propeller shaft 3 is applied to the engaging portion 26 and the concave portion 28.
It is transmitted to the inner hub 14 via the frictional engagement portion with and the propeller body 10 is rotated. Therefore, even if slippage occurs between the sleeve member 7 and the inner hub 14 during navigation as described above, the outboard motor 1 is tilted up on the sea to propeller body.
The propeller shaft 3 and the propeller main body 10 can be directly connected to each other and sailing can be continued simply by raising 10 above the water surface and reversing the mounting direction of the flow regulating member 25. It should be noted that turbulent flow occurs in the rear portion of the propeller main body 10 when the rectifying member 25 is arranged in the reverse direction, but it is much more important to prevent the propeller shaft 3 from idling.

6 to 11 show another embodiment of the flow regulating member 25. Similar to the conventional retaining washer 18 shown in FIG. 12, the rectifying member 25 has a disc-shaped disc 29 which forms a female spline 30 and is spline-engaged with the rear end portion of the propeller shaft 3.
And a rectifying section wing protruding from the outer peripheral surface of the disk 29.
It consists of 31 and. This wing 31 is the wing 12 of the propeller body 10.
It is formed in the same twisting direction as the above and functions as an engaging portion 26 when it is attached to the propeller shaft 3 in the front-rear direction. In other words, the blade 31 has a rib 13 (engagement portion) as a locking piece that connects the inner hub 14 and the outer hub 11 when the straightening member 25 is attached to the propeller shaft 3 in the front-rear direction.
Is engaged and fixed in the circumferential direction.

According to this embodiment, the propeller body is
With the rotation of 10, the blades 31 of the flow control member 25 rotate in the vicinity of the outer peripheral portion of the rear end of the outer hub 11, so that the water flowing along the outer periphery of the outer hub 11 is entrained inward from the rear end portion of the outer hub 11. It is possible to prevent the occurrence of turbulent flow at the rear portion of the propeller main body 10. Further, the rotation of the blade 31 of the rectifying member 25 is
There is also an advantage that it works by sucking out engine exhaust gas that passes through the exhaust passage between the inner hub 14 and the outer hub 11, lowering back pressure and improving output. Then, when the cushion member 16 is destroyed and slippage occurs between the sleeve member 7 and the inner hub 14, if the outboard motor 1 is tilted up and the rectifying member 25 is attached in the front-rear direction, the wing 31 Since the ribs engage with the ribs 13, the rotational force of the propeller shaft 3 can be directly transmitted to the propeller main body 10 and the navigation can be continued.

As described above, according to the present invention, the flow regulating member regulates the flow at the rear portion of the propeller body to avoid the occurrence of turbulence and reduce the propulsion resistance during forward traveling. Also, if the cushion member breaks and slippage occurs between the sleeve member and the inner hub, the propeller shaft and the propeller body can be directly connected by attaching this rectifying member in the front-reverse direction, and the subsequent navigation It has a great practical effect of being able to continue.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention, FIG. 2 is a sectional view of the same assembled state, FIG. 3 is a side view of the same, and FIG. 5 is a side view, FIG. 6 is a side view of a second embodiment of the present invention, FIG. 7 is a side view of the same, and FIG. 8 is a flow regulating member of the same embodiment. FIG. 9 is a perspective view, FIG. 9 is a cross-sectional view of the same embodiment where the flow regulating members are attached in the front-rear direction, FIG. 10 is a side view of the same, FIG. FIG. 13 is an exploded perspective view showing a conventional structure, and FIG. 13 is a side view of the same assembled state. 1 ... Outboard motor, 3 ... Propeller shaft, 7 ... Sleeve member, 10 ... Propeller body, 11 ... Outer hub, 12 ... Wing,
13 ... Rib, 14 ... Inner hub, 16 ... Cushion member,
20 …… grooved nut, 25 …… rectifying member, 26 …… engaging part,
27 ...... female spline, 28 ... recess, 31 ... wing, 50 ... conical surface.

Claims (3)

[Scope of utility model registration request] 1. A propeller body comprising an outer hub having wings formed therein and an inner hub connected to the outer hub, a sleeve member engaged with a propeller shaft, and a propeller body interposed between the inner hub and the sleeve member. In a propeller structure of an outboard motor having a cushion member mounted to transmit the rotational force of the propeller shaft to the propeller body and a fixing means for fixing the propeller body at a predetermined position, between the inner hub and the fixing means. At the propeller shaft end of, a rectifying member that prevents the occurrence of turbulent flow at the rear of the propeller body is detachably disposed, and a concave or convex engaged portion is formed at the end of the propeller body. While forming a spline that engages with the propeller shaft on the inner periphery of the rectifying member, a rectifying portion that prevents the occurrence of the turbulent flow is formed on at least a part of the outer periphery of the rectifying member, and at least a rear portion of the rectifying member. The outboard motor is provided with a convex engaging portion that is engaged and fixed to an engaged portion of the propeller body when the rectifying member is attached to the propeller shaft in the front-rear direction. Propeller structure. 2. A propeller body comprising an outer hub having wings formed therein and an inner hub connected to the outer hub, a sleeve member engaging with a propeller shaft, and a propeller body interposed between the inner hub and the sleeve member. In a propeller structure of an outboard motor having a cushion member mounted on the propeller shaft for transmitting the rotational force of the propeller shaft to the propeller body, and a nut for fixing the propeller body at a predetermined position, the propeller shaft is engaged with the propeller shaft at an inner periphery thereof. A straightening member having a spline and having a substantially conical surface that tapers toward the rear side of the outboard motor is provided on the outer periphery, and the straightening member can be attached to and detached from the end portion of the propeller shaft between the inner hub and the nut. On the other hand, at the end of the propeller body, a concave portion is provided at the end of the propeller body, which is in close contact with and fixed to at least a part of the substantially conical surface of the rectifying member when the rectifying member is attached in the reverse direction. Propeller structure of the outboard motor, wherein the door. 3. A propeller body including an outer hub having wings formed therein and an inner hub connected to the outer hub, a sleeve member engaging with a propeller shaft, and a propeller body interposed between the inner hub and the sleeve member. In a propeller structure of an outboard motor having a cushion member mounted on the propeller shaft for transmitting the rotational force of the propeller shaft to the propeller body, and a nut for fixing the propeller body at a predetermined position, the propeller shaft is engaged with the propeller shaft at an inner periphery thereof. A rectifying member having a spline and having blades twisted in the same direction as the propeller body is provided on the outer periphery, and the rectifying member is detachably attached to the propeller shaft end portion between the inner hub and the nut, while the propeller body is provided. A propeller for an outboard motor, characterized in that a locking piece is provided at an end of the locking member, the locking piece being circumferentially engaged with and fixed to the wing of the rectifying member when the rectifying member is mounted in a reverse direction. Structure.