JP2000016391A - Power transmission device for inboard engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent slip-off of a stopper by providing a stopper mechanism screw-engaged with an output shaft to regulate the movement in the direction of the output shaft. SOLUTION: In the case of moving a cone sleeve 61 downward by a shift mechanism 7, an output shaft 1 is moved upward. At this time, a thrust washer 8b applied to the output shaft 1 is brought into contact with the lower surface 4a of a forward gear 4 to regulate the movement of the output shaft 1 so that the output shaft 1 is not further moved. In the case of transmitting backward torque, the output shaft 1 is moved downward. When the output shaft 1 is moved downward, a stopper mechanism 8 is separated from the forward gear 4 to be free. Thus, the stopper mechanism 8 is screw-engaged with a screw part 12 of the output shaft 1 not to be slipped off. The stopper mechanism 8 is thus constructed, so that even if the output shaft 1 is moved in any manner in the vertical direction, the stopper mechanism 8 is screw-engaged with the output shaft 1 to keep the stopper mechanism 8 from slipping off.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power transmission device for an inboard / outboard motor, and more particularly to a stopper mechanism for preventing the output shaft of the inboard / outboard motor from falling off.

[0002]

2. Description of the Related Art FIG. 2 shows a conventional power transmission device for an inboard / outboard motor. As shown in FIG. 2, a power transmission device for a normal inboard / outboard motor includes an output shaft 1 rotatably mounted on a housing 10 via bearings 91 and 92, and a rotatably supported shaft on the output shaft 1. A forward gear 4 and a reverse gear 5 which are always fitted to a drive gear 3 which is opposed to and integrally rotates with the input shaft 2; a forward torque from the forward gear 4 and a reverse gear 5;
Mechanism 6 for selectively transmitting the reverse torque from the transmission gear 1 to the output shaft 1, and a shift mechanism 7 for switching between transmission of the forward torque from the forward gear 4 and transmission of the reverse torque from the reverse gear 5 by the clutch mechanism 6. Is provided.

The clutch mechanism 6 is mounted on the output shaft 1 so as to be screwable, and has a forward-side tapered surface 61a and a backward-side tapered surface 61b formed on its side peripheral surface. A forward-side cone clutch 62 that is integrally rotatably mounted and has a forward-side friction surface 62a that can be engaged with a forward-side tapered surface 61a of the cone sleeve 61, and a cone sleeve 61 that is integrally rotatably mounted on the reverse gear 5 The output shaft 1 includes a reverse-side cone clutch 63 having a reverse-side friction surface 63a that can be engaged with the reverse-side taper surface 61b. A stopper mechanism 8 is added. The stopper mechanism 8 includes two semicircular stopper rings 81, 81 that are fitted in a groove 1a formed in the circumferential direction of the output shaft 1,
Inner peripheral groove 82 fitted into these stopper rings 81, 81
The stopper 82 is formed with a. The stopper 82 is put on the stopper ring 81 from above, and the stopper 82 is pressed down by the stopper 82 to form the stopper mechanism 8. When the power transmission device is driven to move the output shaft 1 upward, the stopper mechanism 8 also moves upward, and the upper surface 82b of the stopper 82 comes into contact with the lower end surface 4a of the forward gear 4 so that the output shaft 1 Further upward movement is restricted.

[0004]

However, the above-mentioned stopper mechanism of the conventional power transmission device has a stopper mechanism in which a stopper is fitted from above to a stopper ring fitted into a groove formed on the output shaft. Therefore, when the output shaft moves downward, the stopper is in a free state in which there is nothing to support it. In this free state, if the stopper rises with any beat,
The stopper ring pressed down from above by the stopper becomes free, and the stopper ring falls off. When the stopper ring falls off, the stopper also falls off,
There is a problem that the output shaft cannot function as a stopper.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above circumstances, and it is a technical object of the present invention to prevent a stopper for restricting axial movement of an output shaft of a power transmission device for an inboard / outboard motor from falling off. It is assumed that.

[0006]

According to a first aspect of the present invention, there is provided an output shaft rotatably mounted on a housing via a bearing, and an output shaft rotatably mounted on the output shaft. A forward gear and a reverse gear that are always fitted to drive gears that are axially supported and opposingly rotate integrally with the input shaft, and selectively transmit a forward torque from the forward gear and a reverse torque from the reverse gear. A power transmission device for an inboard / outboard motor, comprising: a clutch mechanism that transmits to an output shaft; and a shift mechanism that switches selection between transmission of forward torque from the forward gear and transmission of reverse torque from the reverse gear by the clutch mechanism. A power transmission device for an inboard / outboard motor, comprising: a stopper mechanism which is screwed to the output shaft and regulates movement of the output shaft in the axial direction.

According to the above invention, since the stopper mechanism for restricting the movement of the output shaft in the axial direction is screwed to the output shaft, the stopper mechanism can be moved no matter how the output shaft moves in the axial direction. The mechanism is screwed to the output shaft, so that the stopper mechanism does not fall off and the stopper mechanism can be prevented from falling off.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below with reference to FIG. 1. In FIG. 1, the same parts as those in the prior art shown in FIG.

FIG. 1 is a partial sectional view showing a power transmission device for an inboard / outboard motor in this embodiment. In the figure, a power transmission device 100 is connected to a housing 10 via bearings 91 and 92.
An output shaft 1 rotatably mounted on the output shaft 1, and a forward gear 4 always engaged with a drive gear 3 rotatably supported by the output shaft 1 and opposed to and integrally rotating with the input shaft 2.
And a reverse gear 5, a clutch mechanism 6 for selectively transmitting the forward torque from the forward gear 4 and the reverse torque from the reverse gear 5 to the output shaft 1, a forward torque from the forward gear 4 and the reverse gear by the clutch mechanism 6. 5 is provided with a shift mechanism 7 for selectively switching the reverse torque from the reverse torque 5.

The clutch mechanism 6 includes a cone sleeve 61 having a forward tapered surface 61a and a reverse tapered surface 61b formed on a peripheral surface thereof, and a forward taper of the cone sleeve 61 which is attached to the forward gear 4 so as to be integrally rotatable. A forward-side cone clutch 62 having a forward-side friction surface 62a engageable with the surface 61a; and a reverse-side friction capable of engaging with the reverse-side taper surface 61b of the cone sleeve 61 which is attached to the reverse gear 5 so as to be integrally rotatable. The reverse-side cone clutch 63 has a surface 63a. Cone sleeve 61
A screw portion 61c is formed on the inner peripheral surface of the output shaft 1 and a screw portion 11 is also formed on the outer peripheral surface of the output shaft 1 facing the cone sleeve 61. The screw portions 61c and 11 are screwed together. A cone sleeve 61 is attached to the output shaft 1 so as to be screwable.

Further, the output shaft 1 is provided with a nut type stopper mechanism 8 for restricting the upward movement of the output shaft 1. The stopper mechanism 8 is screwed into a screw portion 12 formed directly below a rear end surface (lower surface in the drawing) of the reverse gear 5 of the output shaft 1. A thrust washer 8b abutting on the stopper mechanism 8 is provided above the stopper mechanism 8.
Is provided.

Reference numeral 13 denotes a bearing that rotatably supports the forward gear 4 about the output shaft 1, and reference numeral 14 denotes a bearing that rotatably supports the reverse gear 5 about the output shaft 1. .

In the power transmission device having the above configuration, when an engine (not shown) is driven, the output of the engine is transmitted to the input shaft 2, and the input shaft 2 rotates. When the input shaft 2 rotates, the drive gear 3 integrally attached to the input shaft 2
Also rotate. When the drive gear 3 rotates, the forward gear 4 always fitted to the drive gear 3 and the forward-side cone clutch 6 attached to the forward gear 4 so as to be integrally rotatable.
2, and the reverse gear 5 and the reverse-side cone clutch 63 that is attached to the reverse gear 5 so as to be integrally rotatable.
Here, since the driving direction of the driving force transmitted from the driving gear 3 is opposite between the forward gear 4 and the reverse gear 5, the forward gear 4 and the reverse gear 5 rotate in opposite directions. In this case, the forward-side tapered surface 61a of the cone sleeve 61 is not in contact with the forward-side friction surface 62a of the forward-side cone clutch 62, and the reverse-side tapered surface 61b of the cone sleeve 61 is connected to the reverse-side cone clutch 63. In the neutral state in which the output shaft 1 is not in contact with the reverse friction surface 63a, the output shaft 1 does not receive the driving torque, and the forward gear 4 and the reverse gear 5 idle around the output shaft 1 in opposite directions. State.

From the neutral state, the shift mechanism 7
When the cone sleeve 61 receives a downward driving force due to the operation described above, the cone sleeve 61 moves slightly downward by this driving force. By this movement, the forward tapered surface 61a of the cone sleeve 61 comes into contact with the forward friction surface 62a of the forward cone clutch 62, and a frictional force is generated at the contact portion. The cone sleeve 61 is further moved downward while rotating around the output shaft 1 by the rotation of the forward-side cone clutch 62 due to the frictional force thus generated. Thereby, the forward tapered surface 61a of the cone sleeve 61 further bites into the forward friction surface 62a of the forward cone clutch 62, and the frictional force is increased. In this way, the cone sleeve 61 moves downward while rotating, while gradually increasing the frictional force, and the output shaft 1 moves while rotating upward relative to the cone sleeve 61. And
Finally, the output shaft 1 and the cone sleeve 61 are fastened to each other to be completely connected, and the forward torque from the forward gear 4 is transmitted to the output shaft 1.

When the cone sleeve 61 receives an upward driving force from the neutral state by operating the shift mechanism 7, the output shaft 1 and the cone sleeve 61 screwed to the output shaft 1 are slightly To move upwards. By this movement, the reverse side tapered surface 61 of the cone sleeve 61 is moved.
b and the reverse friction surface 63a of the reverse cone clutch 63 come into contact with each other, and a frictional force is generated at the contact portion. The cone sleeve 61 is further moved upward while rotating around the output shaft 1 by the rotation of the reverse-side cone clutch 63 due to the frictional force thus generated. As a result, the reverse tapered surface 61b of the cone sleeve 61 further cuts into the reverse friction surface 63a of the reverse cone clutch 63, and the frictional force is increased. In this way, the cone sleeve 61 moves upward while gradually increasing the frictional force, and the output shaft 1 moves while rotating downward relative to the cone sleeve 61. Finally, the output shaft 1 and the cone sleeve 61 are fastened to each other and completely connected, and the reverse torque from the reverse gear 5 is transmitted to the output shaft 1.

In the operation of the power transmission device described above, when the forward torque is transmitted to the output shaft 1, that is, when the cone sleeve 61 is moved downward by the shift mechanism 7, the output shaft 1 moves upward. At this time, output shaft 1
The thrust washer 8b attached to the abutment contacts the lower surface 4a of the forward gear 4, and regulates the movement of the output shaft 1 so that the output shaft 1 does not move further upward.

When the reverse torque is transmitted to the output shaft 1, that is, when the cone sleeve 61 is moved upward by the shift mechanism 7, the output shaft 1 moves downward. When the output shaft 1 moves downward, the stopper mechanism 8 separates from the forward gear 4 and becomes free. However, since the stopper mechanism 8 is screwed to the screw portion 12 of the output shaft 1, it does not fall off.

As described above, according to this embodiment, in the power transmission device 100 for an inboard / outboard motor, the stopper mechanism 8 screwed to the screw portion 12 of the output shaft 1 is formed, so that the output shaft 1 is The stopper mechanism 8 is screwed to the output shaft 1 no matter how the stopper mechanism 8 moves, and the stopper mechanism 8 does not fall off.

[0019]

As described above, according to the present invention,
In a power transmission device for an inboard / outboard motor, a stopper for restricting axial movement of an output shaft thereof can be prevented from falling off.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view of a power transmission device for an inboard / outboard motor according to an embodiment of the present invention.

FIG. 2 is a partial sectional view of a power transmission device for an inboard / outboard motor according to the related art.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Output shaft 11 ... Screw part 12 ... Screw part 2 ... Input shaft 3 ... Drive gear 4 ... Forward gear 5 ... Reverse gear 6 ... Clutch mechanism 61: cone sleeve 62: forward cone clutch 63: reverse cone clutch 7: shift mechanism 8: stopper mechanism 8b: thrust washer 91, 92: bearing 10 Housing 100 Power transmission device

Claims (1)

[Claims] An output shaft rotatably mounted on a housing via a bearing, and a drive gear rotatably supported by the output shaft and opposed to and integrally rotating with the input shaft. Forward and reverse gears, a clutch mechanism for selectively transmitting forward torque from the forward gear and reverse torque from the reverse gear to the output shaft, and transmission of forward torque from the forward gear by the clutch mechanism. A power transmission device for an inboard / outboard motor including a shift mechanism for switching between transmission and transmission of a reverse torque from the reverse gear, wherein a stopper mechanism is screwed to the output shaft to regulate movement of the output shaft in the axial direction. A power transmission device for an inboard / outboard motor, comprising: