JPH0721892Y2 - Internal combustion engine starter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to an internal combustion engine starter for transmitting a driving force to an output shaft of the engine to start the engine when the engine is started.

[Prior Art] As a simple internal combustion engine starter, a drive side rotating body that is rotationally driven at the time of starting and a driven side rotating body attached to an output shaft of the internal combustion engine are coupled via a clutch pawl. , There is a type that transmits the driving force for starting. Generally, a starting device of this type includes a driven-side rotating body that is attached to an output shaft of an internal combustion engine and has a notch for engaging a clutch claw on a peripheral wall portion, a driving-side rotating body that is rotationally driven at the time of starting, and the driving-side rotating body. A clutch pawl that is rotatable between a coupling position that engages with a cutout portion of a driven-side rotating body that is rotatably supported by a non-coupling position that is disengaged from the cutout portion, and a drive-side rotating body of the internal combustion engine. It has a clutch pawl driving member that pushes the clutch pawl to a coupling position when it rotates in the starting direction, and retracts the clutch pawl to a non-coupling position when the drive-side rotating body rotates to the side opposite to the starting direction. .

The most commonly used starter of this type is the so-called recoil starter. An example thereof is shown in FIGS. 9 and 10. In these figures, reference numeral 1 denotes a cup-shaped driven-side rotating body attached to an output shaft (not shown) of an internal combustion engine, and a clutch claw engaging notch 1a is provided on the peripheral wall portion thereof. Reference numeral 2 denotes a drive side rotating body, which is rotatably supported by a shaft 5 fixed to a starter cover 4 attached to a cover 3 of an internal combustion engine, and is urged in one direction by a mainspring 6. . The drive side rotating body 2 has a pulley portion 2a, and a rope 7 is wound around the pulley portion. A knot 7a is formed at one end of the rope 7, and the knot is engaged and fixed in a groove 2b provided on the inner peripheral side of the pulley portion 2a.

The driving side rotating body 2 has an end portion having a substantially cylindrical clutch pawl support portion.
2c, the clutch pawl support portion 2c is inserted inside the driven side rotating body 1, and the clutch pawls 9 are respectively attached to a plurality of (two in the illustrated example) shafts 8 fixed to the clutch pawl support portion 2c. Is rotatably supported. Each clutch pawl 9 is the 10th
As shown in the drawing, the notch portion of the driven-side rotating body 1 is arranged in the fan-shaped recess 2d provided in the clutch claw support portion 2c.
It is possible to rotate between a coupling position that engages with 1a and a non-coupling position that disengages from the notch. A cup-shaped clutch pawl drive member 10 for driving the clutch pawl 9 is supported on the shaft 5, and a part of the clutch pawl 9 is loosely fitted in a groove 10a provided in a peripheral wall portion of the clutch pawl drive member 10. There is. The clutch pawl drive member 10 is coupled to the shaft 5 with a predetermined friction, and rotates together with the drive side rotary body 2 only when the rotational force applied from the drive side rotary body 2 via the clutch pawl 9 exceeds a predetermined value. It is supposed to do.

In the above-mentioned starting device, when the rope 7 is pulled, the drive side rotating body 2 rotates counterclockwise in FIG. At this time, the clutch pawl drive member 10 is frictionally coupled to the shaft 5 and is stopped, so that the clutch pawl 9 is moved by the clutch pawl drive member 10.
It is pushed out to the outside (in the direction of arrow A1) by hitting the end of the groove 10a. As a result, as shown in FIG. 10, the clutch pawl 9 engages with the notch 1a of the driven side rotating body 1 to couple the driving side rotating body 2 and the driven side rotating body 1 to rotate the output shaft of the engine. To be When the rope 7 is released, the drive-side rotating body 2 rotates clockwise in FIG. 10 due to the urging force of the mainspring 6. At this time, the clutch pawl drive unit 10 is frictionally coupled to the shaft 5 and cannot immediately rotate in the clockwise direction.
The clutch pawl 9 contacts the end of the groove 10a of the clutch pawl drive member 10 and is rotated inward (in the direction of arrow A2). As a result, the clutch pawl 9 is disengaged from the driven side rotating body 1, and the coupling between the driving side rotating body 2 and the driven side rotating body 1 is released.

Since the above recoil starter requires a considerable amount of force for starting, it is considered to drive the driving-side rotating body by using an electric motor instead of driving by the rope.

When the drive-side rotating body of the recoil starter is driven by an electric motor, the operation at the time of starting the engine is the same as in the case of driving by a rope. When the power supply to the electric motor is stopped after it is confirmed that the engine has started, the rotation speed of the driven-side rotating body 1 becomes faster than the rotation speed of the driving-side rotating body 2. 9 is pushed to retract the clutch claw inward, and the coupling between the driving side rotating body 2 and the driven side rotating body 2 is released. That is, in the case of starting by the electric motor, the difference in rotational speed generated between the drive side rotating body and the driven side rotating body after the engine is started is utilized without reverse rotation of the drive side rotating body after the engine is started. I was trying to disengage the clutch.

[Problems to be Solved by the Invention] However, in actuality, it is difficult to effectively retract the clutch pawl 9 only by utilizing the difference in rotational speed generated between the driving-side rotating body and the driven-side rotating body. In the above configuration, there is a problem in that the driven side rotating body 1 and the clutch claw come into contact with each other after the engine is started to generate noise, or the clutch claw is damaged. In order to avoid this, it is necessary to use an expensive clutch such as a bendix type clutch or a one-way clutch, which inevitably increases the cost.

An object of the present invention is to use a simple clutch mechanism having a structure similar to that of a conventional recoil starter so that an engine can be started by using an electric motor as a drive source without causing the above problems. To provide an engine starting device.

[Means for Solving the Problems] The present invention is directed to a driven-side rotating body that is attached to an output shaft of an internal combustion engine and has a notch for engaging a clutch pawl in a peripheral wall portion, and a drive-side rotating body that is rotationally driven at the time of starting. A clutch pawl that is rotatably supported by the drive-side rotating body and is rotatable between a coupling position that engages with the cutout portion of the driven-side rotation body and a non-coupling position that is disengaged from the cutout portion, and the drive-side rotation body. A clutch pawl driving member that pushes the clutch pawl to a coupling position when the internal combustion engine rotates in the starting direction, and retracts the clutch pawl to a non-coupling position when the drive-side rotating body rotates to the side opposite to the starting direction; In an internal combustion engine starting device including a starting electric motor for driving a side rotating body, the clutch pawl can be reliably retracted to a disengaged position after the engine is started.

Therefore, in the present invention, the starting electric motor is rotated in the starting direction when the internal combustion engine is started, and when the starting of the internal combustion engine is completed, the rotating direction of the starting electric motor is reversed to reverse the starting electric motor to the starting direction. A motor drive circuit for rotating the direction was provided.

[Advantage of the Invention] When the electric motor drive circuit as described above is provided and the starting electric motor is rotated in the reverse direction when the engine is started, the clutch pawl drive member acts on the clutch pawl even when the engine is completely started. Since the pawl can be reliably retracted to the non-coupling position, the coupling between the driving side rotating body and the driven side rotating body can be surely cut off, and the clutch pawl is prevented from being damaged or generating noise. be able to.

[Embodiment] An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows the electrical construction of the embodiment of the present invention.
In the figure, M is a starting electric motor that drives the drive side rotating body of the starting device, E / G is an internal combustion engine, and D is an electric motor drive circuit. The motor drive circuit D includes a changeover switch SW and a battery B.
And a capacitor C. The switch SW includes a movable contact Sm having a pair of electrode portions m1 and m2 and a pair of fixed contacts (a1 and a2).
2), (b1, b2) and (c1, c2), the electrode parts m1 and m2 of the movable contactor are connected to one end and the other end of the armature of the electric motor M, respectively. The movable contact Sm is shown in Fig. 2 (A).
As shown in Fig. 3, the electrodes m1 and m2 are fixed contacts a1 and a2 and
The first position in contact with b1 and b2 and the second position in which the electrode parts m1 and m2 contact the fixed contacts d1 and d2, respectively, as shown in FIG. 2B, can be switched. .

The battery B is connected between the fixed contacts a1 and a2 of the changeover switch SW, and the capacitor C is connected between the fixed contacts b1 and b2. The fixed contacts d1 and d2 are connected to the fixed contacts b2 and b1, respectively.

In the motor drive circuit D, the switch SW is switched to the first position to bring the electrode parts m1 and m2 of the movable contact into contact with the fixed contacts a1, a2 and b1, b2, respectively, as shown in FIG. 2 (A). Then, the capacitor C is charged to the illustrated polarity, and the starting electric motor M is energized. As a result, the electric motor rotates in one direction, the clutch CL closes, and the rotation of the electric motor is transmitted to the internal combustion engine E / G.

After the internal combustion engine is started, the switch SW is switched to the second position, and as shown in FIG.
When m1 is brought into contact with the fixed contacts d1 and d2, respectively, the voltage across the capacitor C is applied to the electric motor M in the opposite direction, so that the electric motor M is reversed. This will disengage the clutch CL,
The electric motor M and the internal combustion engine E / G are separated. Capacitor C
When the discharge of 1 is completed, the electric motor M is stopped.

In the embodiment shown in FIG. 1, the changeover switch SW is manually operated. However, when the completion of engine start is detected from the rotation speed of the internal combustion engine, the switch SW is automatically operated when the completion of start is detected. It can also be configured to switch between.

FIG. 3 shows a motor drive circuit D which can be used in the present invention.
In this example, a relay coil Ry1, a first relay including a movable contact m1 driven by the relay coil and fixed contacts a1 and b1, a relay coil Ry2, and the relay coil are shown. And a second relay composed of fixed contacts a2 and b2. The fixed contacts a1 and a2 are connected to the negative electrode and the positive electrode of the battery B, respectively, and the fixed contacts b1 and b2 are connected to the positive electrode and the negative electrode of the battery B, respectively. The movable contact m1 is connected to one end of the armature of the electric motor M via the start switch SW ₀ , and the movable contact m2 is connected to the other end of the armature. A generator G is attached to the internal combustion engine E / G, and when the output of the generator G exceeds a set value, the relay coils Ry ₁ and Ry ₂ are excited through an exciting circuit (not shown). . The exciting circuit is provided with a timer so that the relay coils Ry ₁ and Ry ₂ are energized for a certain period of time.

In the circuit of FIG. 3, when the relay coils Ry ₁ and Ry ₂ are not excited, the movable contacts m1 and m2 are in contact with the fixed contacts b1 and b2 respectively, and the relay coils Ry ₁ and Ry ₂ are excited respectively. At times, the movable contacts m1 and m2 contact the fixed contacts a1 and a2, respectively.

When the engine start switch SW ₀ is closed, the battery B →
A current flows through the path of fixed contact b1 → movable contact m1 → switch SW ₀ → electric motor M → movable contact m2 → battery B, and electric motor M rotates in one direction. As a result, the clutch CL is closed, the electric motor M is connected to the internal combustion engine E / G, and the engine is started. When the engine start is completed and the rotation speed thereof exceeds the set value, the output voltage of the generator G exceeds the set value, so that the relay coils Ry ₁ and Ry ₂ are excited. Therefore, the movable contact m1 and
m2 contacts the fixed contacts a1 and a2, and the voltage of the battery B is applied to the electric motor M in the reverse direction. Therefore, the electric motor M reverses and the clutch CL is disengaged. When a certain period of time has passed, the energization of the relay coil is stopped by the function of the timer in the excitation circuit. After that, when the switch SW ₀ is opened, the electric motor M is stopped.

FIG. 4 shows an example in which a brushless DC motor is used as the starting electric motor M, and the electric motor M is a three-phase armature winding.
Transistors Tr ₁ to Tr ₃ each having W1 to W3 and turning on / off a current flowing through the windings W1 to W3 are provided. The motor drive circuit D is shown in FIGS. 5A to 5C when a start command is given by a switch not shown.
Given of from drive signals V1 repeats a high level H and low level L according to the position of the rotor of the motor as shown in the time chart V3 to the base of the Tr3 to transistors Tr1, respectively, thereby to free the transistor Tr ₁ Tr ₃ Are sequentially turned on and off to rotate the electric motor M in one direction. The clutch CL is closed by the rotation of this electric motor, and the electric motor M and the internal combustion engine E /
The engine is started by connecting with G. Motor drive circuit D also inputs the detection signal Vn of the rotational speed of the internal combustion engine, the drive signal for reverse rotation to the transistors Tr ₁ when starting the engine detection signal Vn completed has reached the set value Tr ₃ V1 Through V3
give. Time charts of these reverse drive signals are shown in FIGS. 6 (A) to 6 (C). As a result, the electric motor M is reversed and the clutch CL is disconnected to disconnect the electric motor M from the internal combustion engine. The detection signal Vn of the rotation speed of the internal combustion engine
Is a signal whose magnitude or frequency changes according to the number of revolutions of the engine, such as the output of a generator mounted on the internal combustion engine or the voltage periodically induced in the primary coil of the ignition device for the internal combustion engine. You can

Next, an example of the configuration of the mechanical portion of the starting device used in the present invention will be described with reference to FIGS. 7 and 8.

In FIG. 7 and FIG. 8, 20 is a cup-shaped driven-side rotor attached to the output shaft 21 of the internal combustion engine.
A plurality of clutch claw engaging notches 20a are provided on the peripheral wall portion at equal angular intervals. Reference numeral 22 is a starter cover screwed to a cover 23 of an internal combustion engine (not shown), and a starter motor M is attached to the starter cover 22.

The starting electric motor M has the axis line of its output shaft 26 as the driven side rotating member.
The output shaft 26 is arranged in a state where it coincides with the central axis of 20 and the output shaft 26 thereof faces the side of the driven rotor 20.
A sun gear 27 is attached to the. A ring-shaped fixed gear 28 having teeth on its inner periphery is arranged concentrically with the output shaft 26 on the end face of the case of the electric motor M on the side of the rotating body 20, and the fixed gear is attached by a through bolt 29 of the electric motor M to the electric motor M. Is fixed against.

A drive side rotating body 30 is also supported on the output shaft 26 of the electric motor M. The rotary body 30 is supported so as to be freely rotatable with respect to the output shaft 26, and a pair of shafts 31, 31 symmetrically arranged at intervals of 180 degrees are fixed to the drive-side rotary body 30. Axis 3
1, 31 are provided so as to project on both sides of the drive side rotating body 30, and planetary gears 32, 32 are rotatably supported by the portions of the shafts 31, 31 projecting toward the electric motor M side, respectively. Planet gears 32,
32 is meshed with the sun gear 27 and the fixed gear 28, and the planetary gears 32 and 32 rotate while the electric motor M rotates and the sun gear 2
The drive side rotating body 30 is rotated around the output shaft 26 by rotating around the periphery of 7. Sun gear 27, fixed gear 28
Further, the planetary gears 32, 32 constitute a planetary gear reduction mechanism that reduces the rotation of the electric motor M and transmits it to the drive side rotating body 30.

Clutch pawls 40, 40 are rotatably supported on the portions of the shafts 31, 31 projecting toward the driven-side rotating body 20.

The clutch pawl drive member 42 that drives the clutch pawls 40, 40 is
Windows 41c, 41c provided on the peripheral wall of the clutch pawl drive member, each of which is composed of a shallow cup-shaped main body 41a having a hole for rotatably penetrating the output shaft 26 and an annular flange 41b.
The working ends 40a, 40a of the clutch pawls 40, 40 are loosely fitted therein. A circlip 43 is attached to the tip of the output shaft 26,
A spring 44 is provided between the circlip 43 and the main body 41a of the clutch pawl drive member 41. By this spring, the flange portion 41b of the clutch pawl drive member 41 is pressed against the end surface of the fixed gear 28, and due to the friction resistance between the flange portion 41b and the fixed gear 28,
A holding force for keeping the clutch pawl drive member stationary is obtained until the clutch pawl 40 applies a drive force to the clutch pawl drive member 41.

Each clutch pawl 40 is provided so as to be rotatable between a coupling position that engages with the cutout portion 20a of the driven-side rotating body 20 and a non-coupling position that is disengaged from the cutout portion 20a. The rotation range is restricted by the stopper protrusions 45 and 46 that are provided in a protruding manner. In this example, the clutch pawls 40, 40, the clutch pawl drive member 41, and the cutout portion 20 provided in the driven side rotating body 20.
The clutch mechanism is composed of a and.

In the starting device shown in FIGS. 7 and 8, when the starting electric motor M is rotated in one direction to start the engine,
The rotation of the electric motor is driven by the rotation body 3 on the drive side via the planetary gears 40, 40.
0 is transmitted to the rotor 30 together with the clutch pawl 40
Rotate counterclockwise in the figure. Since the clutch pawl drive member 41 is held stationary by frictional contact with the fixed gear 28 when the drive side rotating body 30 starts rotating, the working end of the clutch pawl 40 is the window of the clutch pawl drive member 41. Part 41
It comes into contact with the end of c and is pushed outward, and engages with the notch 20a of the driven side rotating body 20. As a result, the driven-side rotary body 20 and the drive-side rotary body 30 are coupled to rotate the engine.

When the electric motor M is rotated in the reverse direction by the operation of the electric motor drive circuit D described above after the engine is started, the drive side rotating body 30 rotates together with the clutch pawl 40 in the clockwise direction in FIG.
At the moment when the drive side rotating body 30 starts to rotate in the clockwise direction, the clutch pawl drive member 41 is in a stationary state, so that the working end of the clutch pawl 40 has the window portion 41c of the clutch pawl drive member 41.
It is pushed inward by being brought into contact with the end portion of and is retracted to the non-coupling position. As a result, the driving side rotating body 30 and the driven side rotating body 20 are separated.

The mechanical structure of the starting device of the present invention is not limited to the example shown in FIGS. 7 and 8. For example, in the starting device shown in FIG. 9 and FIG. May be configured to be driven by a starting electric motor through a speed reduction mechanism as appropriate.

[Advantages of the Invention] As described above, according to the present invention, the starting electric motor is rotated in the starting direction when the internal combustion engine is started, and the rotation direction of the starting transmission is reversed when the internal combustion engine is completed. Since an electric motor drive circuit for rotating the starting electric motor in a direction opposite to the starting direction is provided by the clutch pawl driving member, the clutch pawl driving member acts on the clutch pawl to ensure that the clutch pawl is in the disengaged position even when the engine is completely started. It can be retracted, and the connection between the driving side rotating body and the driven side rotating body can be reliably cut off. Therefore, there is an advantage that an inexpensive clutch mechanism similar to that used in the recoil starter can be used to start the electric motor.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an example of the electrical configuration of the present invention, and FIG.
FIGS. 3A and 3B are circuit diagrams showing the state of the embodiment of FIG. 1 at the time of starting and at the time of starting completion, and FIG. 3 is a circuit diagram showing a modified example of the electrical configuration of the present invention. FIG. 4 is a circuit diagram showing still another modified example of the electrical structure of the present invention, and FIGS. 5 and 6 are driving outputs from the electric motor drive circuit at the time of starting and at the time of starting completion in the embodiment of FIG. 4, respectively. FIG. 7 is a longitudinal sectional view showing an example of the mechanical structure of the starting device of the present invention, FIG. 8 is a transverse sectional view of the clutch mechanism portion of the starting device of FIG. 7, and FIG. FIG. 10 is a longitudinal sectional view showing a mechanical structure of a conventional starting device, and FIG. 10 is a transverse sectional view of a clutch mechanism portion of the starting device of FIG. 20 ... driven side rotating body, 20a ... notch, 30 ... drive side rotating body, 4
0 ... Clutch pawl, 41 ... Clutch pawl drive member, 41 ... Window portion,
M ... starting motor, D ... motor drive circuit, SW ... changeover switch, C ... Capacitor, B ... battery, Ry _1, Ry ₂ ... relay coil.

Claims (1)

[Scope of utility model registration request] 1. A driven-side rotating body which is attached to an output shaft of an internal combustion engine and which has a notch for engaging a clutch claw on a peripheral wall portion, a drive-side rotating body which is rotationally driven at the time of starting, and a rotation on the drive-side rotating body. A clutch pawl that is freely supported and is rotatable between a coupling position that engages with the cutout portion of the driven-side rotating body and a non-coupling position that is disengaged from the cutout portion, and the drive-side rotating body has a starting direction of the internal combustion engine. A clutch pawl drive member that pushes the clutch pawl to the coupling position when the clutch pawl rotates to the coupling position, and retracts the clutch pawl to the non-coupling position when the drive-side rotating body rotates to the side opposite to the starting direction; In an internal combustion engine starting device including a starting electric motor for driving a side rotating body, the starting electric motor is rotated in a starting direction when the internal combustion engine is started, and the starting electric motor is rotated when the starting of the internal combustion engine is completed. Reversed direction An internal combustion engine starting device comprising an electric motor drive circuit for rotating the starting electric motor in a direction opposite to a starting direction.