JP3118874B2 - Forward and reverse gear switching device for outboard motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a forward / reverse gear switching device for an outboard motor.

[0002]

2. Description of the Related Art An outboard motor supports a forward gear and a reverse gear on a propeller shaft, selectively meshes a shifter dog of the propeller shaft with the forward gear and the reverse gear, and rotates the propeller of the propeller shaft forward. Or it is made to reverse. The shifter dog rotates and slides the shifter yoke, and the shifter yoke operates the shift rod up and down to rotate.
The shift rod is divided into a shift rod upper and a shift rod lower, and forward and reverse shift springs are inserted between the shift rods so that the shifter dog can be smoothly disengaged via the shift spring. For example, see Japanese Utility Model Application Laid-Open No. 2-33199.

[0003]

A shift spring for forward and backward movement is inserted into a shift rod upper and a shift rod lower so that the shifter dog can be smoothly disengaged. There is a disadvantage that high precision is required, the assembly man-hour is high, and the cost is high.

In view of the foregoing, the present invention relates to an outboard motor capable of smoothly disengaging a shifter dog in both forward and backward directions by interposing a single balance spring between a shift rod upper and a shift rod lower. It is an object to obtain a forward-reverse gear switching device.

[0005]

To achieve the above object, according to the solution to ## reverse gear switching device before the outboard motor of the invention
Shift rod upper, shift rod lower and both shift rods
And a balance spring interposed between the pads.
A shift rod, and the shift rod
Rotate the shifter yoke engaged with the rod lower end.
The shifter dog provided on the propeller shaft
Selectively mesh with forward or reverse gear
A forward-reverse gear switching device for an outboard motor, comprising: a lower portion of the shift rod upper ;
Place the upper and lower circlips apart from each other, and
Between the clips via the upper and lower washer
Arrange the surrounding coil-shaped balance spring, and
An opening is formed at the top of the lower
Rod outer diameter of the shift rod uppers fit less in parts
Than the inner hole to be inserted and the outer diameter of the balance spring
Forming a hollow portion having a large bore large diameter portion , wherein the hollow portion
The balance with the lower part of the shift rod upper
The spring insert disposed from said opening, said balance
The lower washer of the spring is connected to the large diameter portion of the inner hole in the hollow portion.
Contact the stopper formed on the lower side and
The upper washer is used to cover the opening above the large diameter portion of the inner hole.
A detent mechanism for abutting against a stopper portion of a shift nut, forming a recess at an appropriate position on the outer periphery of the shift rod lower , and urging a notch ball into the recess with a spring to position the shift rod lower at a neutral position;
After the spring is properly compressed, the recess and the knock
Neutral position is released due to disengagement with ball
It is characterized by that.

[0006]

When the shifter rod upper is pushed down, the lower washer hits the end of the large diameter portion of the inner hole of the shift rod lower, and the balance spring is compressed. Then, when the elasticity of the balance spring becomes larger than the elasticity of the notch ball, the notch ball comes out of the recess of the shift rod lower, and the shift rod lower is pushed down. As a result, the shifter yoke rotates, the shifter dog slides and meshes with the forward gear, and the propeller shaft rotates forward. The shifter dog meshes smoothly with balanced pulling. To return the shifter dog to neutral from the forward gear, pull up the shift rod upper and return the notch ball to the recess in the shift rod lower. At this time, there is almost no resistance of the notch ball, and the shift rod lower and the shift rod upper can return directly.

When the shift rod upper is pulled up from the neutral position, the upper washer hits the upper side of the large diameter portion of the inner hole of the shift rod lower, and the balance spring is compressed. When the elasticity of the balance spring becomes greater than the elasticity of the notch ball, the notch ball comes out of the recess, and the shift rod lower is pulled upward. As a result, the shifter yoke rotates in the opposite direction, the shifter dog meshes with the reverse gear, and the propeller shaft rotates in the reverse direction. Pull down the shift rod upper and insert the notch ball into the lower part of the shift rod lower to return to neutral.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. At the lower part of the shift rod upper 2 which is placed vertically on the outboard motor 1, upper and lower washers 3 are fixed to the outside with circlips 4 and a coil-shaped balance spring 5 is elastically inserted between the upper and lower washers 3. Then, the lower part of the shift rod upper 2 is inserted into the large diameter portion 7 of the upper part of the lower part of the shift rod 6, and the cap nut 8 prevents the lower part.
A notch ball 10 is pressed against a recess 9 provided outside the shift rod lower 6 with a spring 11 to position the shift rod lower 6 in a neutral position. A shifter yoke 14 attached to a yoke holder 13 is provided in a lateral hole 12 at a lower end of the shift rod lower 6.
Insert one end of The lower part of the large hole 7
The cap nut 8 is formed with a large diameter
A stopper portion 8a is formed at an end of the portion 7 side. Said
The balance spring attaches its lower washer to the inner hole.
Abut the stopper 6a on the lower side of the diameter part 7 and
A cap for covering a side washer with an opening above the large diameter portion of the inner hole
By contacting the stopper 8a of the nut 8,
Placed inside the department.

The propeller shaft 15 has a propeller 16 attached to the rear end, and is supported by a gear case 17 at a lower portion of the outboard motor 1. The forward gear 18 is a bearing 31
And the reverse gear 19 is connected via a bearing 32
It is supported by a gear case 17. And the propeller
The shaft 15 is connected to the bearing 33 and the forward gear 18
Press-fit bush 34, forward gear 18, bearing
The gear case 17 is supported at two points via the base 31.
The forward gear 18 and the reverse gear 19 are the drive gear 2
0 meshed. A shifter dog 21 is slidably inserted into the propeller shaft 15, and the shifter dog 21 is connected to a shifter shaft 24 with a pin 23 through a lateral hole 22 of the propeller shaft 15. Then, the front end of the shifter shaft 24 is turned by the slider 35.
The slider 35 is provided with a shifter
One end of the workpiece 14 is fitted. That is, shifteryo
The shaft 14 swings in the axial direction to move the shifter shaft 24
Slide shifter dog 21 forward by sliding in the axial direction.
Hold in either the ral or reverse position. The shift rod upper 2 is operated up and down by a lever 25 of a remote control via a link or Bowden wire.

When the shift rod upper 2 is pushed down, the lower washer 3 stops at the lower end of the large-diameter portion 7 of the inner hole of the shift rod lower 6, and the upper washer 3 is pushed down together with the shift rod upper 2 to provide a balance spring. 5 is compressed. Then, when the elasticity of the balance spring 5 becomes larger than the elasticity of the notch ball 10, the notch ball 10 comes off from the recess 9, the neutral is released, and the shift rod lower 6 is also pushed down. As a result, the shifter yoke 14 rotates, pulls the shifter shaft 24, meshes the shifter dog 21 with the forward gear 18, and the propeller shaft 15 rotates forward. Conversely, when the shift rod upper 2 is pulled upward from neutral, the shifter dog 21 meshes with the reverse gear 19, and the propeller shaft 15 rotates in the reverse direction. When moving forward or backward from neutral, the elasticity of the balance spring 5 allows smooth meshing and reduces the shock at the time of meshing. When returning to neutral from forward or backward travel, there is no resistance of the notch ball 10, and the shift rod lower 6 and the shift rod upper 2 return directly to neutral.

[0011]

As described above, according to the present invention, as described above, the shifter dog can be smoothly meshed with one balance spring interposed between the shift rod upper and the shift rod lower. And the shock at the time of meshing can be reduced. And when returning to neutral, it can return directly. In this way, the forward and backward shifter dogs can be smoothly meshed with each other via one balance spring, the structure is simplified, and the cost can be reduced. or,
The accuracy of assembly can be easily ensured, and the assembly work can be simplified.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view of a main part showing an embodiment of the present invention.

FIG. 2 shows the relationship between the shift rod lower of FIG. 1 and a notch ball;
It is the schematic which shows a positional relationship .

FIG. 3 is a vertical sectional side view of a gear case showing an embodiment of the present invention.

FIG. 4 is an overall side view showing an embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 2 shift rod upper 3 washer 4 circlip 5 balance spring 6 shift rod lower 7 large diameter inner hole 9 notch 10 notch ball 14 shifter yoke 21 shifter dog

Claims (1)

(57) [Claims] 1. A shift rod upper and a shift rod lower.
Balance spring interposed between the gear and both shift rods
And a shift rod comprising:
Shifter engaged with the lower end of the shift rod
-Rotate the yoke and install it on the propeller shaft
Selectable shifter dog for forward gear or reverse gear
Forward / backward gear switching device for outboard motors
A location, in the lower part of the shift rod upper, between predetermined up and down
Place the upper and lower circlips apart from each other, and
Outside the rod through the upper and lower washer between the circlips
A coil-shaped balance spring surrounding the periphery is arranged, and an opening is formed at the upper part of the shift rod lower.
Moni, inside least the shift rod Upper rod
Outside the balance hole and the inner hole into which the outer diameter is inserted
Form a hollow part with a large diameter inner hole larger than the diameter ,
In the hollow part, the lower part of the shift rod
The balance spring is inserted and arranged from the opening portion, the lower Wasshiya of the balance spring in the hollow portion
Abut the stopper formed below the large-diameter portion of the inner hole
At the same time, the upper washer is opened at the upper part of the large diameter portion of the inner hole.
Abutting against a stopper portion of a cap nut covering the portion, forming a recess at an appropriate position on the outer periphery of the shift rod lower ,
Shift rod lower by urging the notch ball into the dent with a spring
The detent mechanism for positioning the over to the neutral position
And the recess after the balance spring is appropriately compressed.
And the notch ball are disengaged from the neutral position
A forward / reverse gear switching device for an outboard motor.