JPH10103202A - Engine starting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an engine starting device which is reliably operated owing to the use of a cam mechanism, simple in construction, small-sized, lightweight, as well as easy to assemble and inexpensive owing to the reduction of the number of parts. SOLUTION: The captioned device is structured such that at starting of the engine, a plunger gear 9 advances, owing to the action of a starter motor 3, resisting a biassing means to mesh with a gear 4 on the crank side to rotate, and after starting of the engine, the plunger gear 9 backs to release the meshing with the gear 4 on the crank side to return to the initial position owing to the action of the biassing means. In this case, a collar 10 is provided integrally rotatably on a rotary shaft 7 which is driven by the starter motor 3, a slider 11 on which is provided the plunger gear 9 through a one-way clutch 13 is axially supported so as to reciprocate in an axial direction, and there is provided a cam mechanism such that, at starting of the engine, the slider advances owing to the rotation of the collar 10 to cause the plunger gear 9 to mesh with the gear 4 on the crank side, and after starting of the engine, the meshing of the plunger gear 9 with the gear 4 on the crank side is released to return the slider 11 to the initial position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine which is interposed between a starter motor and a crankshaft and functions to connect when the starter motor starts the crankshaft and disconnect when the start is completed. The starting device.

[0002]

2. Description of the Related Art An engine starting device is disclosed in, for example,
As disclosed in Japanese Unexamined Patent Publication No. 1-27584 and Japanese Patent Publication No. 3-75750, a diving gear is supported via a one-way clutch on a starter motor shaft or a rotating shaft of an intermediate shaft that rotates simultaneously therewith. When the motor is started, the jump gear moves axially along a spiral spline formed on the rotating shaft, and finally jumps into a crank-side gear such as a ring gear linked to the crankshaft, starts meshing, and starts the engine. When the engine is started, the dive gear is rotated in reverse to the crank-side gear which has started to rotate by the start of the engine, thereby disengaging the engagement and returning to the original position.

[0003]

By the way, since the jump gear may move in the direction of returning to the original position and disengage due to various causes during start-up of the starter motor, there is a possibility that the movement is prevented. Although a release prevention mechanism is additionally provided, a jump gear, a one-way clutch and a release prevention mechanism are arranged side by side in the axial direction on the rotating shaft, and the length is increased in the axial direction, the size is increased, and the weight is increased. In addition, there is a problem that the release prevention mechanism is provided independently, the mechanism is complicated, the number of parts is increased, the assembly is complicated, and the cost is high.

The present invention has been made in view of the above points, and operates reliably by using a cam mechanism. Further, the structure is simplified, the size and weight are reduced, and the number of parts is reduced to assemble. It is an object of the present invention to provide an easy and inexpensive starting device for an engine.

[0005]

According to a first aspect of the present invention, there is provided an engine starter for an engine according to the first aspect of the present invention. After the engine starts, the dive gear moves backward, disengages with the crank side gear, and returns to the initial position by the urging means. In the device, a collar is provided so as to be integrally rotatable on a rotating shaft driven by the starter motor, and the jump gear rotatably supports a slider provided via a one-way clutch so as to be able to reciprocate in the axial direction. When the engine is started, the slider is moved forward by the rotation of the collar to engage the dive gear with the crank side gear. To release the engagement between the write gear and the crank gear is characterized in that it comprises a cam mechanism for returning the slider to an initial position. In this way, the engagement and disengagement of the dive gear and the crank-side gear can be performed by the cam mechanism of the collar and the slider, and the cam mechanism can be used to reliably operate and simplify the structure. Thus, the apparatus is small, lightweight, easy to assemble with a reduced number of parts, and inexpensive.

According to a second aspect of the present invention, in the engine starter, the collar has a cam portion formed at a shaft end and a driving portion extending in an axial direction, and the slider is fitted to the collar. A driven portion extending in the axial direction is provided on the inner wall of the concave portion to be provided, and biasing means is provided for constantly contacting the axial end of the driven portion with the cam portion of the collar, and the cam portion is rotated by rotation of the collar. The driven part of the slider was pushed and advanced in the axial direction against the urging means, disengaged from the cam part of the collar and engaged with the end, and provided on the slider via a one-way clutch. The dive gear meshes with the crank-side gear, and the driving section pushes the driven section to rotate integrally.When the engine is started, the collar is engaged with the dive gear in mesh with the crank-side gear. How to release the slider And restrict the movement of holding the meshing of the crank gear and the Hikomi gear after the engine is started,
The driven portion is disengaged from the end of the collar to release the engagement between the dive gear and the crank side gear, and the slider is returned to the initial position by the biasing means. . When engine start is started by the starter motor, the slider of the collar moves in the meshing direction due to the rotation of the rotating shaft, and the dive gear supported by the slider meshes with the crank side gear. In this meshing state, the driven portion of the slider is engaged with the end of the collar, and the movement of the slider in the disengagement direction can be reliably restricted to start the engine. After the engine starts, the rotation of the crank side gear increases, the driven part of the slider disengages from the end of the collar, the slider surely returns to the initial position, and the engagement between the dive gear and the crank side gear is released. be able to.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an engine starting device according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a front view of an engine for a jet propulsion boat in which an engine starting device is incorporated, FIG. 2 is a sectional view of an operating state of the engine starting device, FIG. 3 is a perspective view of a collar, and FIG. FIG. 5, FIG. 5 is a perspective view of the slider, FIG. 6 is a diagram illustrating the slider, FIG. 7 is a diagram illustrating the operation of the engine starter, FIG. 8 is a cross-sectional view illustrating the operation state of the collar and the slider. 9 is a front view for explaining the operation state of the collar and the slider.

[0008] A crankshaft 2 is supported by an engine 1 mounted on a small jet propulsion boat. A starting device S of the engine 1 is interposed between a starter motor 3 and the crankshaft 2, and the starter motor 3 is connected to a crankshaft. It functions so that it is connected when the axis 2 is started, and is disconnected when the start is completed.

A crank gear 4 is provided at the front end of the crankshaft 2.
Is fixed. The starter motor 3 is fastened and fixed to a crankcase 90 by bolts 91 as shown in FIG. A pinion gear 6 is integrally formed at the front end of the output shaft 5 of the starter motor 3, and the pinion gear 6 meshes with a driven gear 8 provided on a rotating shaft 7. The rotating shaft 7 is
This is a member that is disposed in parallel with the output shaft 5 of the crankshaft 2 and the starter motor 3, and that transmits torque to the crank-side gear 4 of the crankshaft 2 via the dive gear 9. A spring 92 is provided at the tip of the rotating shaft 7, and the rotating shaft 7 is pressed against the starter motor by the spring 92.

The driven gear 8 is press-fitted into the end of the rotating shaft 7 and transmits the rotating force of the starter motor 3 to the rotating shaft 7. A collar 10 is press-fitted into the center of the rotating shaft 7 so as to be integrally rotatable. The slider 11 is supported so that it can reciprocate in the axial direction of the rotating shaft 7. When the engine is started, the slider 11 is advanced by rotating the collar 10 to engage the dive gear 9 with the crank side gear 4, and after the engine is started, the dive gear 9 and the crank side gear 4 are meshed with each other. And a cam mechanism A for returning the slider 11 to the initial position.

That is, the collar 10 has a cam portion 10a formed at the shaft end and a driving portion 10b extending in the axial direction, with one end 10c being on the driven gear 8 side and the other end 10d being on the slider 11 side. Assembled. Bottom 1 of cam part 10a
0a1 is, as shown in FIGS. 4 (a), (b) and (e),
The top surface 10a2 is located at the center of the collar 10 and the other end 1
It continues to 0d. FIG. 4C shows the driving unit 10b.
As shown in (d), a guide portion 10b1 for driving the slider 11 is formed.

The slider 11 has a driven part 11 extending in the axial direction on an inner wall of a concave part 11 a fitted into the collar 10.
b. A cutout portion 11b1 is formed at an axial end of the driven portion 11b, and the cutout portion 11b1 contacts the cam portion 10a of the collar 10.

A cylindrical inner surface of a slider 11 is rotatably supported on a cylindrical outer surface of the rotary shaft 7 via a bearing 12.
The dive gear 9 is rotatably supported on the small-diameter shaft portion 11c via a one-way clutch 13. Washers 14 and 15 are provided on both sides of the dive gear 9.
The positions of the dive gear 9 and the one-way clutch 13 are maintained by the gears 4 and 15, and the washer 15 on one side is provided with a small-diameter shaft portion 11c.
A buffer member 17 is provided between the other washer 14 and the large-diameter shaft portion 11d of the slider 11. The buffer member 17 absorbs an initial impact when the dive gear 9 meshes with the crank side gear 4.

The circlip 16 functions as a buffer member 17, washers 14 and 15, a dive gear 9 and a one-way clutch 13 to prevent the slider 11 from coming off.
From falling off. A spring 19 constituting a biasing means is provided between the bearing 12 and the stopper 18, and biases the notch 11b1 of the slider 11 so as to always contact the cam portion 10a of the collar 10. The stopper 18 is supported on the rotating shaft 7 by a ring 20.

Next, the operation when the starter motor 3 starts and the engine 1 starts will be described. Before the starter motor 3 is started, the slider 11 is in the initial position by the spring 19 as shown in FIG.
That is, at the time of stopping, the other end portion 10d of the collar 10 and the bottom surface 11e of the slider 11 are in contact with each other as shown in FIG.

When the engine is started, when a starter switch (not shown) is turned on, the starter motor 3 starts rotating. The driven gear 8 meshing with the pinion gear 6 rotates in conjunction with the starter motor 3, and the collar 10 press-fitted into the rotating shaft 7 rotates in conjunction with it. For this reason,
As shown in FIG. 7B, the rotation of the collar 10 causes the cam portion 1 to rotate.
Notch 11b of slider 11 along the slope of 0a
1 is pushed to advance in the axial direction against the spring 19,
The other end 10d of the collar 10 shown in FIG.
1 is separated from the bottom surface 11e. Then, the driven portion 11b of the slider 11 is disengaged from the cam portion 10a of the collar 10 and is engaged with and held by the end portion 10d. As shown in FIG. While being engaged with the gear 4, the driving unit 10b pushes the driven unit 11b to transmit rotation and rotate integrally.

As described above, the driving unit 10b provided on the collar 10 and the driven unit 10b provided inside the slider 11 connect the driven gear 8 and the dive gear 9 which have been free to the rotation direction until then. Lock. The locked diving gear 9 transmits rotation to the crank gear 4. Since the rotation of the crank side gear 4 is unstable until the engine is started, the dive gear 9 attempts to return to the original position. Restricts the movement of the slider 11 in the detaching direction, holds the engagement between the dive gear 9 and the crank side gear 4, and does not return because the notch 11b1 of the slider 11 is received by the end 10d of the collar 10.

After the engine is started, when the engine is started, the dive gear 9 moves to the cam portion 10a because it rotates ahead to a position where it cannot be received by the other end portion 10d of the collar 10, and is pushed by the spring 19, The driven portion 11b is disengaged from the other end 10d of the collar 10 to return the slider 11 to the initial position, and the engagement between the dive gear 9 and the crank side gear 4 is released.

As described above, the dive gear 9 and the crank side gear 4 are driven by the cam mechanism A of the collar 10 and the slider 11.
Can be engaged or disengaged, and it can be reliably operated by using the cam mechanism A. Moreover, the structure is simplified, the size and weight are reduced, and the number of parts is reduced to facilitate assembly. Therefore, it is an inexpensive device.

The one-way clutch 13 protects the starting device S by rotating the dive gear 9 in advance when the rotation speed of the engine side exceeds the starter motor side due to the engagement of the dive gear 9 with the crank side gear 4. . In addition, the stopper 18 prevents the spring 19 from dropping off, and the tip of the small-diameter shaft portion 11c of the slider 11 comes into contact with the stopper 18, thereby restricting the movement of the slider 11 to prevent excessive movement.

[0021]

As described above, according to the first aspect of the present invention, the engagement or disengagement of the jump gear and the crank side gear can be performed by the cam mechanism of the collar and the slider. By using the mechanism, the device can be reliably operated, the structure can be simplified, the device can be reduced in size and weight, the number of components can be reduced, the assembly can be easily performed, and the device can be manufactured at low cost.

According to the second aspect of the present invention, when the start of the engine by the starter motor is started, the rotation of the rotating shaft causes the cam portion of the collar to move in the meshing direction of the collar, and the dive gear pivotally supported by the slider is cranked. In this meshing state, the driven portion of the slider engages with the end of the collar in this meshing state, so that the movement of the slider in the disengagement direction can be reliably restricted and the engine can be started. After the engine starts, the rotation of the crank side gear increases, the driven part of the slider disengages from the end of the collar, the slider surely returns to the initial position, and the engagement between the dive gear and the crank side gear is released. be able to.

[Brief description of the drawings]

FIG. 1 is a front view of a jet propulsion boat engine in which an engine starting device is incorporated.

FIG. 2 is a cross-sectional view of an operation state of an engine starting device.

FIG. 3 is a perspective view of a collar.

FIG. 4 is a diagram illustrating a color.

FIG. 5 is a perspective view of a slider.

FIG. 6 is a diagram illustrating a slider.

FIG. 7 is a diagram illustrating the operation of an engine starter.

FIG. 8 is a cross-sectional view illustrating an operation state of a collar and a slider.

FIG. 9 is a front view illustrating an operation state of a collar and a slider.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Engine 3 Starter motor 4 Crank side gear 7 Rotating shaft 9 Dive gear 10 Collar 10a Cam part 10b Drive part 11 Slider 11b Driven part 13 One-way clutch A Cam mechanism S Engine starting device

Claims (2)

[Claims] When the engine is started, a starter motor causes a dive gear to move forward against urging means, mesh with a crank side gear and rotate, and after the engine is started, the dive gear moves rearward to rotate the crank side gear. In the engine starting device which releases the meshing with the initial position by the urging means, a collar is provided so as to be integrally rotatable on a rotating shaft driven by the starter motor, and the jump gear is connected via a one-way clutch. The collar is provided so as to be reciprocally movable in the axial direction, and the collar and the slider are moved forward by the rotation of the collar when the engine is started, so that the jump gear meshes with the crank side gear. A cam mechanism that releases the engagement between the dive gear and the crank side gear after the start and returns the slider to an initial position. Starting device of the engine. 2. The collar has a cam portion formed at an axial end and a driving portion extending in an axial direction, and the slider is driven by a driven member extending in an axial direction on an inner wall of a concave portion fitted to the collar. A biasing means for always contacting the axial end of the driven portion with the cam portion of the collar, and the driven portion of the slider is pushed by the cam portion by the rotation of the collar. Advancing in the axial direction against the urging means, disengaging from the cam portion of the collar and engaging with the end, the dive gear provided on the slider via a one-way clutch meshes with the crank side gear, The driving unit pushes the driven unit to rotate integrally, and at the time of engine start, the collar regulates the movement of the slider in the detaching direction in a state where the dive gear meshes with the crank side gear. Dive gear and the clan After the start of the engine, the driven portion is disengaged from the end of the collar to release the engagement between the dive gear and the crank side gear, and the biasing means initializes the slider. A starting device for an engine, wherein the starting device is configured to return to a position.