JPH0613999U - Outboard motor screw - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] Minimize the slip phenomenon that occurs during high-speed operation. The inner shaft hub 28 is provided on its inner surface with a protruding rib 60 or a serrated line 62 extending in the axial direction, which increases the tightness between the shaft hole and the rubber sleeve 44. Prevent slip.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a ship screw, and more particularly to an outboard engine screw.

[0002]

[Prior art]

 As shown in Fig. 1, the structure of a common outboard engine screw consists of an outer shaft hub 1, several blades 2 integrally formed on the outer shaft hub 1, and three blades every 120 °. An inner shaft hub 3 mounted in the shaft hole of the outer shaft hub 1 with ribs 4 formed therein, a spline hub 5 mounted in the shaft hole of the inner shaft hub 3, and a spline hub. It consists of a hub 5 and a rubber sleeve 6 fitted between the shaft holes of the inner shaft hub 3, and the drive shaft 7 of the outboard engine is inserted into the inner spline of the spline hub 5 and The teeth of the inner splines mesh with each other and are further tightened by a receiving ring 8, a lock washer 9 and a nut 10, and finally with a lock pin 11 provided at the end of the drive shaft 7. Insert the spline into the pin hole 12 -If the hub 5 is fixed and the drive shaft 7 is operated, the screw will rotate with it and the propulsion effect will occur.

The screw has some problems in actual use. First, since the inner surface of the shaft hole of the inner shaft hub 3 is a flat surface, if the elasticity of the rubber sleeve 6 is reduced, the drive shaft 7 and the inner shaft hub 3 of the drive shaft 7 may be reduced during high speed operation. Slip occurs in the meantime.

Secondly, the exhaust heat generated when the engine outside the ship is operating is discharged through the gap between the inner shaft hub 3 and the outer shaft hub 1. In the process of this, Then, it penetrates into the inside of the shaft hole through the gap between the shaft hole opening of the inner shaft hub 3 and the receiving ring 8 (as shown by the arrow in FIG. 1) to accelerate the deterioration and corrosion of the rubber sleeve 6, and to prevent the outboard The slip between the motor drive shaft 7 and the inner shaft hub 3 is further exacerbated.

Thirdly, in this type of screw, when the lock pin 11 is removed from the drive shaft 7, the screw and the drive shaft 7 are separated, and can be easily stolen or maliciously destroyed.

[0006]

[Problems to be solved by the device]

 Therefore, the main object of the present invention is to provide an outboard motor screw which is improved so as to minimize the slip phenomenon occurring at high speed operation.

Another object of the present invention is to reduce the structure in which exhaust heat of the engine enters into the inner shaft hub, and to prevent the deterioration and corrosion of the rubber sleeve from accelerating. Is to provide a screw.

Still another object of the present invention is to provide a screw for an outboard motor having an antitheft function.

[0009]

[Means for Solving the Problems]

 In order to achieve the above objects, the screw of the outboard motor of the present invention is divided into an outer shaft hub and a number of blades integrally formed on the outer side of the outer shaft hub, and the shaft is divided into substantially equal parts. The inner shaft hub is connected to the shaft hole of the outer shaft hub by a rib that extends along the direction, and is made in the shape of a pipe, which has a number of teeth that extend along the axial direction. A spline hub that is installed in the shaft hole of the inner shaft hub and is used by being connected to the power output end of the drive shaft of the outboard engine, and the shaft holes of the outer and inner shaft hubs of the spline hub. The inner sleeve has a rubber sleeve that is fitted in between, and a fitting portion that extends along the axial centerline direction is integrally molded on the surface of the inner bore of the inner hub. If inserted, snap it into place with the mating part. Only increase the tightness, whereby if the outboard movers is high-speed operation, wherein the slip occurs on the drive shaft and the screw be reduced.

Another feature of the outboard motor screw provided by the present invention is that the inner shaft hub has a ring-shaped protective rim having the same hole diameter as the outer diameter of the spline hub on the front side of the shaft hole. It is to protect the rubber sleeve installed in the shaft hole of the shaft hub from being attacked by the exhaust gas of the engine outboard.

Another feature of the outboard motor screw provided by the present invention is that a ring-shaped flange extending along the circumferential direction is provided outside the end of the spline hub, and its outer diameter is When the spline hub is mounted within the bore of the inner shaft hub by approximately the same diameter as the inner bore of the inner shaft hub, the front and rear ends of the spline hub will have ring-shaped protective rims and rings inside the inner hub. Guided by the profiled flange, when mounted, the centers of both can coincide with each other, and there is no need to center the other. It should be noted here that if the cores of the two do not match, eccentric operation will occur when the screw rotates.

Another feature of the outboard motor screw of the present invention is that it includes a lock nut for tightening the screw on the outboard motor drive shaft, which can be pinched by any tool. It has a side surface that does not have a side face, and a female fitting part is provided on the top surface of the body, and a key fitting having a main body that can be clamped by a tool and a male fitting part that extends outward from one side of the main body are included. The lock nut cannot be turned unless the male fitting part of the hook is fitted to the lock nut. The best mode for carrying out the present invention will now be described in more detail with reference to the drawings.

[0013]

【Example】

 2 to 5, the screw 20 of the outboard motor of the present invention includes an outer shaft hub 22 made of an aluminum alloy and three blades integrally formed on the outer side of the outer shaft hub 22. An inner shaft hub 28 and an inner shaft hub 28 that are integrally molded in the shaft hole 30 of the outer shaft hub 22 and are connected to the surface 34 of the shaft hole 30 by ribs 32 that are all separated by 120 °. Of the pipe-shaped copper spline hub 36 and the outer and inner shaft hubs 28 of the spline hub 36, which are installed in the shaft hole 38 of the A rubber sleeve 44, etc., mounted between the surfaces 48 of the shaft bore 38 is included. The spline portion 52 of the drive shaft 50 of the outboard engine is inserted into the inner spline 40 of the spline hub 36 and meshes with each tooth groove. Prior to insertion, the spline hub 36 is fitted with a catch ring 53 on the front side, with the threaded portion 54 at its end projecting outward from the end of the spline hub 36, and the lock washer 56 and lock nut. Screwed and locked by 58.

One of the features of the screw 20 of the present invention is that three screws corresponding to each rib 32 are provided on the surface 48 of the shaft hole 38 of the inner shaft hub 28 and are extended along the shaft center line. When the protruding ribs 60 are provided (as shown in FIG. 5) so that the rubber sleeve 44 is fitted between the inner shaft hub 28 and the spline hub 36, the protruding ribs 60 are fitted to the surface of the rubber sleeve 44 and the rubber sleeve 44. The tightness of the attachment between the sleeve 44 and the surface 48 of the shaft bore 38 of the inner shaft hub 28 is increased, and therefore between the drive shaft 50 and the inner shaft hub 28 when the outboard motor is operated. The chances of slipping are always less than regular ones. The same effect can be obtained even if the projecting rib 60 is replaced with a large number of sawtooth lines 62 as shown in FIG.

Another feature of the outboard motor screw 20 of the present invention is that a radially extending ring-shaped protective rim 64 near the front end of the shaft hole 38 surface 48 of the inner shaft hub 28 thereof. And the diameter of its ring hole 66 is equal to the outer diameter of the front end of the spline hub 36, so that when the spline hub 36 is fitted into the shaft hole 38, the protective rim 64 is The hot gas discharged from the engine outside the ship that comes into close contact with the end face cannot enter the shaft hole 38, and the problem that the rubber sleeve is eroded by the hot gas and deteriorates quickly in the conventional type is completely eliminated. Will be resolved.

Another feature of the screw 20 of the present invention is that a radially extending ring-shaped flange 68 is provided on the distal outer end surface of the spline hub 36, the outer diameter of which is equal to that of the inner shaft hub 28. When the spline hub 36 is installed in the shaft hole 38 by the same diameter as the shaft hole 38, the flange 68 is in close contact with the hole surface 48 of the shaft hole 38, and the ring-shaped protective rim 64 is simultaneously guided. In action, the spline hub 36 is quickly installed in the shaft hole 38 with its center aligned with the center of the shaft hole 38. It should be noted that the conventional screw does not have such a guide structure, so when the spline hub is mounted in the inner shaft hub, it takes a considerable amount of manpower and time to position both centers, and otherwise it is necessary. If so, eccentric vibration occurs.

Another feature of the outboard motor screw 20 of the present invention is that the ring-shaped end face 70 at the end of the spline hub 36 is provided with a large number of wedge-shaped protrusions 72 located at the same distance and on the same circumference. A wedge-shaped recess 73 is formed between each wedge-shaped protrusion 72. A hexagonal recessed chamber 74 is provided in the center of the lock washer 56, and a large number of ear plates 76 corresponding to the wedge-shaped recesses 73 are provided on the peripheral edge. The lock nut 58 has an umbrella portion 78 and a hexagonal main body portion 80 extending downward from the umbrella portion 78, and the side peripheral surface of the umbrella portion 78 is formed into a taper that widens from the top to the bottom. The surface 82 is perforated with holes 84 at 120 ° intervals. When the lock nut 58 is turned, it is carried out by a hook fitting 86, and the hook fitting 86 is provided with a hexagonal main body 88 and a projecting pillar 90 extending outward from the bottom surface of the hexagonal main body 88. . When assembling, align each protrusion 90 of the hook metal fitting 86 with the hole 84 of the lock nut 58, then insert the lock washer 56 and the lock nut 58 onto the threaded portion 54 of the drive shaft 50, and at the same time, use the hexagon spanner. Hold the hook metal fitting 86 and turn. If the locking nut 58 is tightened in the thread 54, one of the ear plates 76 will fit into one of the wedge-shaped recesses 73, so a tool can be used to bend the ear plate 76 into the wedge-shaped recess 73. Then, the operation of tightening the screw 20 on the drive shaft 50 is completed. To remove the screw 20, reverse the order. As can be seen from the above, since the side surface of the lock nut 58 of the present invention is an inclined surface, it cannot be turned with a tool, in other words, without this key fitting 86, the lock nut 58 can be opened. Can not. Therefore, the problem that the conventional screw can be easily removed from the drive shaft is solved by this.

[Brief description of drawings]

FIG. 1 is an axial cross-sectional view of a screw of a conventional outboard engine.

FIG. 2 is a perspective view of an optimum embodiment of the present invention.

FIG. 3 is an exploded view of the preferred embodiment of the present invention.

4 is a sectional view taken along line 4-4 of FIG.

5 is a sectional view taken along line 5-5 of FIG.

FIG. 6 is a cross-sectional view of another embodiment of the present invention taken in the same direction as FIG.

[Explanation of symbols]

 20… Screw 22… Outer shaft hub 26… Blade 28… Inner shaft hub 32… Rib 36… Spline hub 44… Rubber sleeve 53… Bearing ring 56… Lock washer 58… Lock nut 60… Protruding rib 62… Saw blade Line 64… Protective rim 68… Ring type flange 86… Key fitting

Claims (7)

[Scope of utility model registration request] 1. A screw for an outboard engine, comprising: an outer shaft hub having an outer surface integrally formed with a number of blades; and ribs arranged at substantially equal intervals and extending in the axial direction. The inner shaft hub is connected to the shaft hole of the outer shaft hub, and has a plurality of tooth grooves formed in a pipe shape and extending in the axial direction on the inner surface of the hole. A spline hub attached to and connected to a power output end of a drive shaft of an outboard motor; and a rubber sleeve fitted in an outer side of the spline hub and a shaft hole of the inner shaft hub. A fitting portion extending along the center line of the shaft is integrally formed on the surface of the shaft hole of the inner shaft hub, and the rubber sleeve is formed of the spline
When mounted between the outer surface of the hub and the inner surface of the hole of the inner shaft hub, the fitting parts engage with each other to increase the frictional force between the inner shaft hub and the rubber sleeve,
A screw for an outboard engine, wherein the drive shaft of the outboard engine prevents the occurrence of a screw slip phenomenon during high-speed operation. 2. The fitting portion integrally formed on the surface of the shaft hole of the inner shaft hub is a protruding rib that extends a predetermined length along the shaft center line and has a predetermined spacing. The screw for an outboard engine according to claim 1. 3. The fitting portion integrally formed on the surface of the shaft hole of the inner shaft hub is a saw tooth groove extending a predetermined length along the shaft center line and distributed at predetermined intervals. The screw for an outboard motor according to claim 1. 4. A ring-shaped protective rim is provided at a front end of a shaft hole surface of the inner shaft hub, and a diameter of the ring hole is substantially equal to a front end pipe diameter of the spline hub, and a distal end of the spline hub is provided. The outer side surface is provided with a ring-shaped flange that extends horizontally outward, and its outer diameter is
The spline hub is guided by the ring-shaped protective rim and the ring flange so as to have a shaft hole diameter substantially equal to that of the inner shaft hub, and the shaft center of the spline hub is aligned with the center of the inner shaft hub. The outboard motor screw according to any one of claims 1 to 3, wherein the screw can be attached and is not eccentric even after being attached. 5. A lock nut is further included to allow the drive shaft of an outboard motor to be mounted on a screw when inserted into the spline hub, the lock nut for any tool. It also has a side surface that is not pinched, and a slight female fitting part is provided on the top surface of it, and the key fitting has a body to be pinched by a tool and the female on the lock nut provided on the body. The outboard motor screw of claim 1, wherein there is a slight male fitting that mates with the fitting to allow the lock nut to be tightened or loosened. 6. The spline hub distal end surface comprises:
A large number of predetermined projections are provided on the same circumference, and recesses are formed between the projections.In addition, a lock washer is included, and a recessed chamber is provided at the center of the washer. An ear plate corresponding to each recess is provided on the periphery to accommodate the lock nut in the recess chamber. 2. The end of the spline hub is bent into the recess of the end face of the spline hub.
The outboard motor screw described in. 7. The recessed chamber of the lock washer is formed in a polygonal shape, and the lock nut is provided with a polygonal body corresponding to the polygonal recessed chamber. The outboard engine screw according to item 6.