JPS6053785B2 - Internal combustion engine starting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a Bendex-type starting device for starting, for example, an internal combustion engine of a motorcycle.

More specifically, a governor member is provided on the outer peripheral side of a movable cylinder member that is helically spline-fitted with the pinion shaft and connected to the pinion gear via a one-way clutch, and the position of the governor member is regulated in the axial direction. The pinion gear is movable in the radial direction of the shaft by centrifugal force, and the engagement between the governor member and a locking member provided close to it prevents the pinion gear from returning early until the internal combustion engine is stably driven. The present invention relates to a starting device for an internal combustion engine that is capable of preventing irregular ignition of the engine, and also making it possible to reduce the size and capacity of the starting motor.

2. Description of the Related Art A starting device called a Bendex type or an inertial sliding type is known as a device for starting an internal combustion engine of a motorcycle or the like.

This system has a pinion gear on a pinion shaft rotated by a starter motor, a movable cylinder member connected to the pinion gear via a one-way clutch, and the movable cylinder member is fitted to the pinion shaft with a helical spline. be. When the pinion shaft is rapidly rotated by the starter motor, the movable cylinder member and pinion gear slide on the pinion shaft due to inertia, the pinion gear jumps into the ring gear of the internal combustion engine, reaches the end of the pinion shaft, and rotates together with the pinion shaft. The ring gear is rotated by the pinion gear, and the internal combustion engine is started. After the internal combustion engine starts, the pinion gear rotates freely with respect to the movable cylinder member using a one-way clutch.The pinion gear receives forced rotation from the ring gear, and the rotation speed of the pinion gear increases compared to the pinion shaft, and when it reaches a predetermined rotation speed, the one-way clutch rotates. The pinion gear is moved due to the drag torque of the engine and the rebound force of the return spring. The moving cylinder member returns on the pinion axis,
The pinion gear separates from the ring gear. In this case, after the internal combustion engine is started and ignited, the internal combustion engine does not drive stably immediately, and the rotational speed is uneven immediately after starting, and the rotational speed may temporarily reach a point where the pinion gear separates from the ring gear.

Conventionally, there is a known device that prevents the pinion gear from disengaging from the ring gear using a member such as a slide pin to prevent early disengagement until the internal combustion engine reaches a certain rotation speed. This is insufficient for internal combustion engines with large variations in rotational speed, such as single-cylinder internal combustion engines and two-stroke internal combustion engines, and cannot necessarily be put to practical use. The rotational speed fluctuates until the internal combustion engine is driven stably, and if the pinion gear separates from the ring gear while the internal combustion engine is in an unstable state, the internal combustion engine will experience irregular ignition and stop.

FIG. 8 is a graph specifically showing this, in which the vertical axis is the number of revolutions N and the horizontal axis is time T.

The rotational speed of the internal combustion engine fluctuates in the initial stage of startup, and the rotational speed of the pinion gear also fluctuates accordingly, as shown in the graph, and high rotational speed A occurs intermittently. The rotation speed B of the pinion shaft is determined by the starter motor, and if the rotation speed of the pinion gear given by the ring gear becomes higher than the rotation speed B of the pinion shaft at a time A, the pinion gear A return force is generated to try to disengage from the ring gear, and even though the internal combustion engine is not in a stable driving state, the pinion gear disengages from the ring gear prematurely, causing irregular ignition and the internal combustion engine to stop. . In such a case, the starting motor must be temporarily stopped and the switch operated again, which makes the operation cumbersome. In order to solve the above problems, it is necessary to use a starter motor in which the rotation speed of the internal combustion engine is uneven and the rotation speed of the pinion shaft is always higher than the rotation speed A of the pinion gear even when it fluctuates. According to this, the starting motor naturally becomes larger and becomes a high-speed rotating type with large torque and large capacity, which goes against the desire for smaller starting motors.

In view of the above-mentioned conventional problems, the present inventors have devised the present invention to effectively solve the problems, and it is possible to reliably drive an internal combustion engine without using a starter motor that rotates the pinion shaft so fast. The present invention has been made in such a way that it can be done.

An object of the present invention is to provide a governor member on the outer peripheral side of a movable cylinder member that is helically spline-fitted with a pinion shaft and connected to a pinion gear via a one-way clutch, and to regulate the axial position of this governor member. It is attached to a movable cylinder member, etc., and is freely movable in the radial direction of the shaft, and a locking member is provided near the governor member, so that rotation of the pinion shaft and the movable cylinder member causes centrifugal force in the radial direction of the shaft. The governor member that has been moved by the engine is engaged with this locking member to prevent the pinion gear meshing with the ring gear of the engine from returning. To provide an engine starting device which allows the engine to be reliably driven by preventing irregular ignition of the engine by continuing to mesh a pinion gear and a ring gear until the pinion shaft is decelerated by opening a switch. .

Therefore, an object of the present invention is to prevent the pinion gear from prematurely disengaging from the ring gear of the engine before the engine is stably driven by the engagement between the governor member and the locking member. There is no need to increase the number of rotations and rotational speed of the pinion shaft compared to when the pinion gear rotates at high speed, and therefore it is possible to downsize and reduce the capacity of the starter motor that rotates the pinion shaft. Provide starting device.

Another object of the present invention is to fix a substantially ring-shaped governor holder to the outer circumferential surface of the movable cylinder member, and to form a guide groove in the axial and radial direction in the governor member so that the governor holder is loosely engaged with the guide groove. This provides an engine starting device in which the position of the governor member in the axial direction relative to the movable cylinder member is regulated via the governor holder, and the governor member is movable in the radial direction of the shaft.

A further object of the present invention is to provide a hollow governor case on the outer circumferential side of the governor member attached to the movable cylinder member, use this case as the locking member, and increase the inner diameter of the governor case on the pinion gear side to form a stepped structure. When the pinion gear and the movable cylinder member are moved by inertia toward the ring gear of the engine and the pinion gear and ring gear are meshed, the governor member, which has moved toward the outer diameter of the shaft due to centrifugal force, hits the stepped portion of the governor case. To provide a starting device for an engine which prevents a pinion gear from early detachment from a ring gear by bringing them into contact with each other.

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a side sectional view showing the entire apparatus according to the present invention, in which a case 2 is attached to a starting motor 1 having an armature 1a inside.

Case 2 is the stator housing 1b of the starting motor 1
It protrudes forward from the top and the necessary parts are installed inside. 1st
The figure is a composite of the forward and backward positions of the pinion gear, movable cylinder member, and other required parts on the axis 0-0 of the pinion shaft, and the upper side of the axis 0-0 is where the ring gear and pinion gear of the internal combustion engine mesh. It shows a state in which it is sliding forward due to inertia. Bearing bushes 3, 3 are installed inside the case 2.
A pinion shaft 4 is installed so as to be rotatably supported, and a reduction gear 4b that meshes with the drive shaft 1c of the starter motor 1 is attached to the rear end of the pinion shaft 4, and the starter motor 1 is driven via the gear 4b. The force is transmitted to the pinion shaft 4. A movable cylindrical member 5 and a pinion gear 6 each formed into a substantially cylindrical shape are assembled on the pinion shaft 4, and a helical spline 4a of a predetermined length is formed on the pinion shaft 4, and a helical spline is formed in the inner diameter hole of the movable cylindrical member 5. A spline 5a is formed, and both 4 and 5 are fitted with a helical spline, and a pinion gear 6 is freely rotatably engaged with the pinion shaft 4 through a bush 7. At the rear of the pinion gear 6 is an enlarged portion 6 with a larger diameter.
a, the front part of the movable cylinder member 5 is inserted into the enlarged part 6a, and the movable cylinder member 5 and the pinion gear 6 are connected and integrated by a plate-like cover 8 which is fixed to the enlarged part 6a. A one-way clutch 9 consisting of rollers 9a1 and elastic springs 9b is interposed between the enlarged part 6a of the pinion gear 6 and the front part of the movable cylinder member 5 inserted into this 6a in the axial radial direction. The clutch 9 allows the pinion gear 6 to rotate in a specific direction with respect to the movable cylinder member 5, allowing free rotation, and prevents rotation in the other direction so that the pinion gear 6 rotates integrally with the movable cylinder member 5.

A cup-shaped spring cover 11 is fixed to the front part of the pinion shaft 4 with a clip 10, and a return spring 12 is compressed between the cover 11 and the pinion gear 6. In FIG. 1, 13 is a ring gear attached to an internal combustion engine such as a motorcycle, and 14 is a dust seal fitted into the front end of the inner diameter hole of the pinion gear 6.

A governor holder 16 is integrally fixed to the outer peripheral surface of the rear end of the movable cylinder member 5 with a circlip 15, and the governor holder 16 is approximately ring-shaped as shown in FIGS. 2 and 3, and extends in the outer radial direction. The protrusion 16a protruding toward...
It is equipped with multiple at equal angular intervals.

Reference numeral 17 denotes a governor weight, which is a governor member, and the governor weight 17 is formed as a plurality of divided pieces, four in the illustrated example, and is recessed from the inner circumferential surface in the outer radial direction to an appropriate depth as shown in FIG. A guide groove 17a is provided.

The guide groove 17a extends to both ends of the arc-shaped governor weight 17, and an insertion groove 17b is formed on both end surfaces from the inner peripheral surface to the outer peripheral surface.
, 17b are provided. A spring accommodating groove 17c extending to both end surfaces is formed on the outer diameter surface. By loosely fitting the guide groove 17a on the inner peripheral surface to the outer peripheral surface of the governor holder 16,
Each governor weight 17 is attached to the movable cylinder member 5 with a governor holder 16 so as to be movable in the radial direction of the shaft by the guiding action of the guide groove 17a while regulating the position in the axial direction. By inserting the sixteen protrusions 16a into the grooves 17b on the end surface, the divided governor weights 17 are made to rotate together with the movable cylinder member 5 and the governor holder 16. An annular coil spring 18 is accommodated in the groove 17c on the outer circumferential surface of the governor weight 17 disposed on the outer circumference of the governor holder 16, and the compressive tightening force of this spring 18 causes each governor weight to be 17...
... is applied with a pressing elastic force in the direction of the moving cylinder member 5.
As shown in FIG. 1, a hollow governor case 19 with an open front is provided on the outer circumferential side of the governor weight 17, and this case 19 is fixed to the pinion shaft 4 by, for example, fixing the closed end surface to the gear 4b. ing.

As shown in FIG. 3, this governor case 19, which is a locking member, consists of a rear small diameter part 19a and a front large diameter part 19b with a slightly larger inner diameter than the small diameter part 19a.
A step portion 19c corresponding to the difference in diameter is formed between the large diameter portion 19b and the large diameter portion 19b, and the governor weight 17 is accommodated in the inner chamber of the small diameter portion 19a with a gap. Next, we will discuss the effect.

When the switch is closed and the starter motor 1 is driven, the pinion shaft 4 rotates via the reduction gear 4b.

Due to the rapid rotation of the pinion shaft 4, the movable cylinder member 5, which is helically spline-fitted with the pinion shaft 4, is prevented from rotating and slides forward on the pinion shaft 4 due to inertia. , and jumps into engagement with the ring gear 13 of the internal combustion engine. When the return spring 12 is compressed and the cover 11 of the return spring 12 comes into contact with the pinion gear 6, the movable cylinder member 5 and the pinion gear 6 begin to rotate together with the pinion shaft 4. The ring gear 13 is rotated by the rotational force of the pinion shaft 4 applied to the pinion gear 6, and the internal combustion engine is started and ignited. When the internal combustion engine starts to start and the pinion gear 6 receives a forced rotational force from the ring gear 13 and the rotational speed becomes faster than the pinion shaft moving cylinder member 5, the one-way clutch 9 causes the pinion gear 6 to rotate against the moving cylinder member 5. It will rotate freely. In the above,
When the pinion shaft 4 rotates and the movable cylinder member 5 begins to rotate together with the pinion shaft 4, the governor weight 17 supported by the governor holder 16 of the movable cylinder member 5 is subjected to the elastic tightening force of the spring 18 due to centrifugal force. The governor weights 17, . . . , are moved in the direction of the outer diameter of the shaft, and the respective governor weights 17 are expanded and displaced in the direction of the outer diameter of the shaft by the guide grooves 17a.

At this time, the governor weight 17 has reached the large diameter part 19b from the small diameter part 19a of the governor case 19 due to the sliding of the movable cylinder member 5 along the pinion shaft 4, and the rear end of the outer peripheral edge of the governor weight 17 is Step part 1
9c, or faces the stepped portion 19c with a slight gap therebetween. When the ring gear 13 is rotated by the pinion gear 5 and the internal combustion engine starts to start, the rotation speed is uneven and fluctuates in the initial stage of startup as described above, but the rotation speed of the pinion gear 6 temporarily changes due to this. Even if the rotational speed for separation from the ring gear 13 is reached, the stepped portion 19c between the governor weight 17 and the governor case 19
The pinion gear 5 does not disengage from the ring gear 13 due to contact and engagement with the ring gear 13, that is, it does not return to the previous retracted position along the pinion shaft 4. 6 is early ring gear 13
There will be no departure from.

Therefore, as long as the starter motor 1 continues to rotate the pinion shaft 4, the rotation from the pinion gear 6 to the ring gear 13 will continue.
Rotational force is transmitted to the internal combustion engine, and starting power can be applied to the internal combustion engine until the engine transitions from an unstable driving state to a stable driving state, and the internal combustion engine can be driven reliably without irregular ignition. . After the internal combustion engine operates stably,
If the switch of the starting motor 1 is opened, the pinion shaft 4
The rotational speed and number of rotations decrease, and along with this, the centrifugal force of the governor weight 17 gradually disappears, and the elastic tightening force of the spring 18 causes each governor weight 17 to move in the direction of the moving cylinder member 5. As a result, the stepped portion 19c between the governor weight 17 and the governor case 19
The pinion gear 6 and movable cylinder member 5 are disengaged from the pinion shaft 4 due to the drag torque of the one-way clutch 9 and the elastic force of the return spring 12 due to the pinion gear 6 having a higher rotational speed than the pinion shaft 4. Return to the top and return to the old position.

From the above, it is not necessary to make the rotational speed of the pinion shaft 4 higher than that of the pinion gear, which temporarily rotates at a high speed due to fluctuations in the rotational speed, and thereby the starter motor 1 can be made smaller and smaller in capacity.

It is also possible to perform snapping, which repeats the warm-up operation while rotating the starter motor 1 without once stopping it. Furthermore, it is possible to obtain the same operating feeling as the constant engagement one-way clutch system used in motorcycles, etc., and it is functionally the same as the electromagnetic push-in type. Furthermore, compared to the electromagnetic push-in type, there is no need for a device to prevent erroneous operation as there is no need for a device to prevent erroneous operation as there is no noise even if the starter switch is accidentally operated while the internal combustion engine is running, and it is easier to operate the starter switch while driving a motorcycle, etc. It is convenient and can be manufactured at low cost. 4 to 6 show another embodiment of the present invention, and FIG. 4 shows only the main part.

In the following description, the same reference numerals are used for the same members as in the previous embodiment. That is, 4 is a pinion shaft, 4b is a reduction gear, 5 is a movable cylinder member that is helically spline fitted to the pinion shaft 4, 6 is a pinion gear connected to the movable cylinder member 5 via a one-way clutch 9, and 12 is the return spring, 1
9 is a governor case. A plate 21 is fixed to the rear end of the movable cylindrical member 5 with a circlip 20, and the movable cylindrical member 5 is
A plurality of governor weights 23 are interposed between the governor holder 22 fixed to the plate 21 and the plate 21.

The governor holder 22 is formed into a substantially ring shape as shown in FIG. 6, and includes three protrusions 22a projecting in the outer diameter direction.
The protrusion 22a is provided with two cutting lines and bent rearward at approximately right angles to form a bent piece 22b for each protrusion 22a. The governor weight 23 is divided into three pieces, and a stepped portion 23a is provided on the outer peripheral surface, a bulged portion 23b is formed on the front surface, and guide stepped portions 23c, 23c are provided at both ends of the bulged portion 23b. Each governor weight 23 is attached so that the protrusion 22a of the governor holder 22 is applied to the guide step 23c, and the axial position is regulated by the plate 21 and the governor holder 22, and the shaft diameter is The governor weight 23 is made freely movable in the radial direction by the guiding action of the guide step portion 23c extending in the direction. Also, the bent piece 22b is connected to the governor weight 23...
By inserting the governor weight 23 between the movable cylinder member 5 and the governor holder 22...
... so that it rotates. governor weight 23
An annular coil spring 2 is provided on the outer peripheral surface stepped portion 23a of the coil spring 2.
4 is fitted to apply the elastic tightening force of the spring 24 to the governor weight 23, and the protrusion 22a of the governor holder 22 prevents the spring 24 from coming off. In the above embodiment, due to the rotation of the pinion shaft 4 and the inertia sliding along the pinion shaft 4, the pinion gear 6 reaches the end of the pinion shaft and jumps into the ring gear, and the pinion gear 6 and the movable cylinder member 5 move to the pinion shaft 4. When the governor weights 23 rotate together with the ring gear, each governor weight 23 moves and expands in the direction of the outer diameter of the shaft due to centrifugal force, and comes into contact with and engages with the stepped portion 19c of the governor case 19, and the pinion gear 6 changes from the ring gear to ensure that the internal combustion engine is stabilized. It prevents early separation before driving, and performs the same function as the previous embodiment.

In addition, according to this embodiment, the governor weight 23 has a shape that can be easily removed from the mold by, for example, precision casting, sinter molding, or press molding, which contributes to stable processing accuracy and improved productivity. do.

FIG. 7 shows a graph comparing the starting motor that had to be used in a conventional starting device and the starting motor of the starting device according to the present invention, where the vertical axis is the rotation speed N and the horizontal axis is the time T. . In the figure, m is the boundary rotation speed between the stable drive region and unstable drive region of the internal combustion engine at room temperature, and N
i is the idle rotation speed, and Nb is the boundary rotation speed between the stable drive region and the unstable drive region at low temperatures. The starting motor of the starting device according to the present invention rotates the pinion shaft, slides the movable cylinder member and the pinion gear by inertia, and when the starting rated rotation speed m necessary for the pinion gear to rotate the ring gear is exceeded, the starting motor rotates the pinion shaft as shown in curve C. As the internal combustion engine rotates on its own, the pinion gear receives forced rotational force from the ring gear, and at point D, the connection between the pinion gear, movable cylinder member, and pinion shaft is severed by the one-way clutch. rotates at a no-load speed of m.

As mentioned above, during this period, the governor weight and the locking member, that is, the engagement with the step part of the governor case, prevents the pinion gear from returning from the ring gear early, and the internal combustion engine is driven stably, and the switch is turned off at point E. If the opening occurs, the rotation speed of the starter motor decreases along the straight line F and the centrifugal force of the governor weight disappears, and when the rotation speed decreases to Nc, the pinion gear separates from the ring gear. In contrast, the starting motor of conventional starters uses a pinion shaft whose rotational speed is always higher than that at high rotational speeds, which fluctuate in the early stages of starting the internal combustion engine. Since it is a necessary condition to maintain the engine speed continuously, it is required that the no-load rotation speed Nm'' falls within the stable drive region and that this Nm'' is larger than the idle rotation speed Ni, thereby increasing the idle rotation speed Ni of the internal combustion engine. The rotational speed of the starter motor and pinion shaft reaches , and becomes larger than the disengagement rotational speed Nc'' of the pinion gear.

In this way, it is necessary to use a motor whose no-load rotational speed Nm'' is larger than the idle rotational speed Ni, and the motor naturally becomes large with high output and large capacity.In the present invention, It is sufficient that the no-load rotational speed of the starter motor is greater than the rated rotational speed Ns, and therefore the motor can be made smaller by achieving a small output and a small capacity.

As is clear from the above description, according to the present invention, the engagement between the governor member and the locking member prevents the pinion gear from disengaging from the ring gear at an early stage. Effectively prevents the rotation speed from returning even if the rotation speed reaches the rotation speed at which the ring gear leaves the ring gear.
The rotation speed of the pinion shaft and the rotation speed of pinion gear disengagement are completely independent, and the starting motor can be set to any desired value without being limited by the pinion gear disengagement rotation speed, making the starting motor more compact than before. It is also possible to achieve reductions in capacity and output.

[Brief explanation of the drawing]

Figure 1 is an overall side cross-sectional view of the starting device, Figure 2 is Figure 1-2-
2-line sectional view, FIG. 3 is an exploded view of the governor part, FIGS. 4 to 6 show another embodiment, FIG. 4 is a sectional view of main parts, and FIG.
The figures are Fig. 4, a sectional view taken along the line 5-5, Fig. 6, a view similar to Fig. 3, Fig. 7, a graph comparing the motor of the starter device according to the present invention and the motor of a conventional device, and Fig. 8. is a graph showing fluctuations in rotational speed at the initial stage of starting the internal combustion engine.

Claims (1)

[Scope of Claims] 1. A movable cylindrical member is helically splined to a pinion shaft rotated by a starter motor, and a pinion gear is connected to the movable cylindrical member via a one-way clutch that only allows rotation from the pinion shaft. , a governor member is provided on the outer peripheral side of the movable cylindrical member, the position of the governor member is regulated in the axial direction with respect to the movable cylindrical member, and the governor member is freely movable in the axial radial direction in response to rotation of the movable cylindrical member. , and a locking member that is close to the governor member and engages with the governor member that has moved in the radial direction of the shaft is provided at a predetermined position from the meshing position of the pinion gear and the ring gear, and the rotation of the pinion shaft is transmitted. In response to the rotation of the movable cylindrical member, the governor member is moved in the radial direction of the movable cylindrical member by centrifugal force and engaged with the locking member, thereby changing the meshing state between the pinion gear and the ring gear. A starting device for an internal combustion engine, characterized in that the starting device is configured to be held while the starting motor is operating. 2. A movable cylindrical member is engaged with a helical spline to a pinion shaft rotated by a starter motor, and a pinion gear is connected to the movable cylindrical member via a one-way clutch that only allows rotation from the pinion shaft. A substantially ring-shaped governor holder is fixed to the outer circumferential surface, and a governor weight having a guide groove recessed from the inner circumferential surface toward the outer diameter is positioned in the axial direction on the movable cylinder member by fitting the guide groove into the governor holder. A locking member is provided on the outer periphery of the governor weight to engage with the governor weight that has moved in the radial direction of the shaft, and the rotation of the pinion shaft moves the pinion gear toward the internal combustion engine side. The sliding and rotating movable cylindrical member causes the governor weight to move in the direction of the outer diameter of the shaft of the movable cylindrical member by centrifugal force and engages with the locking member, thereby adjusting the meshing state between the pinion gear and the ring gear. A starting device for an internal combustion engine, characterized in that the starting device is configured to be held while the starting motor is operating. 3. A movable cylindrical member is engaged with a helical spline to a pinion shaft rotated by a starter motor, and a pinion gear is connected to the movable cylindrical member via a one-way clutch that only allows rotation from the pinion shaft. A governor member is provided on the outer circumferential side, and the position of the governor member is regulated in the axial direction with respect to the movable cylinder member, and is movable in the axial radial direction in response to rotation of the movable cylinder member, A hollow governor case that accommodates the governor member is provided on the side, and the inner diameter of the governor case on the pinion gear side is made larger than the other side to form a stepped portion between them, and centrifugal force is generated by the rotation of the pinion shaft. The governor member is moved in the direction of the outer diameter of the shaft and engaged with the stepped portion of the governor case, and the meshing state between the pinion gear and the ring gear is maintained while the starter motor is operating. Features of internal combustion engine starting device.