JP2003083212A - Starting device for engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a starting device for an engine capable of achieving an excellent engaging of a pinion and a ring gear and reducing impact and impact sound greatly when the pinion engages with the ring gear. SOLUTION: When a start switch 2 is turned on, electric power is supplied to a first coil 110 by a battery 1. A first movable core 134 is attracted and the pinion 14 is moved to the direction of the ring gear 18 through a lever 17. When the pinion 14 abuts on the ring gear 18, an elasticity means 137 bends and urges to press. Afterward, time t1 until the pinion 14 engages with the ring gear 18 fully and deeply is timed by a timer means 20. After time t1 passes, the current of the battery is supplied to a second coil 210 and a second movable core 230 is attracted. Electric current is supplied to a starting generator 10 from the battery 1 by shutting a main contact point 9. On the other hand, the current is controlled to the starting generator 10 by a current control means 30 so as to rotate the starting generator 10 in low speed from the beginning of the energization to the first coil 110 to the shutting of the main contact point 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a starting device for an engine, and more particularly to a starting device that achieves a good connection between a pinion and a ring gear and reduces impact and impact noise during the connection.

[0002]

2. Description of the Related Art FIG. 11 is a schematic block diagram showing a conventional internal combustion engine starter. In the figure, one end of the starting switch 2 and a fixed contact 9A as a battery terminal of the main contact 9 that is normally open are connected to the positive terminal of the battery 1, and the other end of the starting switch 2 serves as a suction coil 3a. It is connected to the connection point A of the holding coil 3b. The fixed contact 9B as a motor terminal of the main contact 9 is connected to the other end of the suction coil 3a and also to the brush 11a of the armature 11 of the starting motor. The movable iron core 4 is a fixed iron core 7.
By being attracted to the side, the rod 8 and the movable iron core 9C fixed to the rod 8 are driven, and the main contact 9 is closed. The other end of the holding coil 3b and the brush 11b of the armature 11 are grounded.

A unidirectional clutch 13 and a pinion 14 are axially movable on a rotary shaft 16 of an armature 11 of the starting motor. On the other hand, a hook 6 is provided at the other end of the movable iron core 4 via a spring 5, and one end of a lever 17 is engaged with the hook 6. This lever 1
The other end of 7 is engaged with the clutch 13, and the fulcrum 1
It is rotatably installed around 7a. The pinion 14 is configured to mesh with a ring gear 18 of an engine (not shown). In addition, 15 is a pinion 1
4 stopper.

Next, the operation of the above conventional starting device will be described. First, when the start switch 2 is turned on, the suction coil 3a and the holding coil 3b are connected to the battery 1, and a current flows through the suction coil 3a and the holding coil 3b. As a result, the movable core 4 is sucked and moved leftward in the drawing while bending a return spring (not shown).
With the movement of the movable iron core 4, the lever 17 moves to the fulcrum 1
7a is rotated counterclockwise in the figure to push the clutch 13 rightward in the figure. When the end surface of the pinion 14 comes into contact with the end surface of the ring gear 18, the pinion 14
Movement is stopped. At this time, since the movable iron core 4 is attracted by the attraction coil 3a and the holding coil 3b, the movable iron core 4 moves while bending the spring 5 in the movable iron core 4.

The movable contact 9C is fixed contact 9A, 9
When it comes into contact with B, the movable core 4 stops moving. When the main contact 9 is closed, the potential difference between both ends of the suction coil 3a becomes almost zero, and no current flows in the suction coil 3a.
The attraction of the movable core 4 is retained only by the attraction force of the holding coil 3b. On the other hand, by closing the main contact 9, the armature 11
Is energized and starts to rotate, the teeth of the pinion 14 and the ring gear 18 are displaced, and the pinion 14 is pushed rightward in the figure by the biasing force of the spring 5 and the spline (not shown), and meshes with the ring gear 18. And armature 1
The rotational force of 1 is transmitted to the ring gear 18 via the pinion 14 to start the engine.

When the start switch 2 is turned off after starting the engine, a current flows from the battery 1 to the suction coil 3a and the holding coil 3b via the movable contact 9C. At this time, a current flows through the holding coil 3b in the same direction as during suction, and a current flows through the suction coil 3a in a direction opposite to that during suction, so that a suction force in a reverse direction is applied between the holding coil 3b and the suction coil 3a. Occur. And since the current flows in both coils in series,
The current values flowing through both coils are the same. Therefore, if the number of turns of each coil is made equal, even if a suction force is generated in the opposite direction, each suction force will be the same ampere-turn and cancel each other's forces to zero.
The movable iron core 4 can be returned by the urging force of a return spring (not shown).

[0007]

In the above-described conventional starting device, the armature 11 is energized before the pinion 14 and the ring gear 18 are completely meshed with each other, and the pinion 14 starts rotating at a high speed. And ring gear 1
There is a problem that the impact at the time of collision with the tooth flank of No. 8 becomes large and a loud impact noise is generated.

Further, before the pinion 14 abuts on the stopper 15, the tooth surface of the pinion 14 collides with the tooth surface of the ring gear 18, and a large current flows through the motor, so that a large torque is generated and the rotating shaft 16 causes the pinion 14 to move. Is transmitted to the ring gear 18 via. The reaction force of this torque becomes a force to push the pinion 14 toward the ring gear 18 by a helical spline portion (not shown) installed on the rotary shaft 16, and finally the pinion 14 is accelerated and collides with the stopper 15. As a result, there is a problem that a large impact sound is emitted.

The present invention has been made in order to solve the above-mentioned problems, and achieves a good coupling between a pinion and a ring gear, and greatly reduces the impact and impact sound at the time of coupling. To provide a starting device.

[0010]

According to a first aspect of the present invention, there is provided a first electric motor for rotationally driving a pinion meshing with a ring gear of an engine, a first coil to which electric power is supplied from a battery when a start switch is turned on, and A first movable iron core that is attracted toward the first fixed iron core by the excitation of one coil and moves the pinion in the ring gear direction via a lever
Of the electromagnet device, elastic means for bending and pushing the pinion toward the ring gear when the end faces of the pinion and the ring gear are in contact with each other, and the time t1 from when the start switch is turned on until the pinion meshes with the ring gear sufficiently deeply. And a second coil to which a battery current is supplied after the time t1 has passed, a second movable iron core attracted to the second fixed iron core side by the excitation of the second coil, and a second movable iron core
A second electromagnet device having a main contact for connecting / disconnecting in conjunction with the movement of the movable iron core to turn on / off the power supply from the battery to the starting motor, and from the start of energization of the first coil to the closing of the main contact. A current control means for controlling a current to the starting electric motor so as to rotate the starting electric motor at a low speed is provided.

The invention of claim 2 is characterized in that, in the invention of claim 1, the current control by the current control means is such that the torque T generated in the starting motor is T> μNr. However, μ: friction coefficient between the pinion end face and the ring gear end face, N: force by which the pinion presses the ring gear,
r: The average radius of the contact portion of the pinion end face with the ring gear.

The invention according to claim 3 is claim 1 or claim 2.
In the invention, the delay time t1 by the timer means is set to 0.
It is characterized in that 02 seconds <t1 <0.2 seconds.

The invention of claim 4 is from claim 1 to claim 3.
In the invention described above, a first current control means for limiting the supply of current from the battery to the first coil is provided after the first movable iron core of the first electromagnet device contacts the first fixed iron core. And

The invention of claim 5 is from claim 1 to claim 4.
In the invention described above, the second current control means for limiting the supply of the current from the battery to the second coil is provided after the second movable iron core of the second electromagnet device contacts the second fixed iron core. And

The invention of claim 6 is from claim 1 to claim 5.
In the current control means of the present invention, ON / O of a pulse signal
It is characterized in that the current supply is controlled by the FF width.

According to a seventh aspect of the present invention, a starter motor for rotationally driving a pinion meshing with a ring gear of an engine, a first coil to which electric power is supplied from a battery when a start switch is turned on, and a first coil excited by the first coil are supplied. 1. A first electromagnet device including a first movable core that is attracted to the fixed core side and moves a pinion in the ring gear direction via a lever,
Timer means for measuring the time t1 from the time when the start switch is turned on until the pinion engages with the ring gear sufficiently deeply, the second coil to which the battery current is supplied after the time t1 has passed, and the second coil is excited by the second coil. A second movable iron core attracted to the fixed iron core side; and a second electromagnet device having a main contact for connecting and disconnecting in conjunction with the movement of the second movable iron core to turn ON / OFF the power supply to the starting electric motor from the battery, The first electromagnet device and the second electromagnet device are coaxially arranged.

According to the invention of claim 8, in the invention of claim 7, before the first coil of the first electromagnet device is energized and the first movable iron core comes into contact with the rod before coming into contact with the first fixed iron core,
This rod is characterized in that the second movable iron core is moved in the direction of the contact leaving a distance that does not close the main contact.

The invention of claim 9 is from claim 1 to claim 8.
In place of the timer means of the invention, a sensor for detecting that the pinion meshes with the ring gear sufficiently deeply is provided.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1. (Structure of Embodiment 1) FIG. 1 shows Embodiment 1 of the present invention.
1 is a schematic configuration diagram showing a starting device for an engine according to FIG. In the figure, the positive terminal of the battery 1 is connected to one end of the starting switch 2, and the other end of the starting switch 2 is connected to the first coil 110 of the first electromagnet device 100. The first electromagnet device 100 is attracted to the first fixed iron core 120 side by exciting the first coil 110 to which power is supplied from the battery 1 when the start switch 2 is turned on and the first coil 110. A first movable iron core 134 is provided. A hook 135 is provided on the first movable iron core 134 via a spring 137, and one end of the lever 17 is engaged with the hook 135. When the first movable iron core 134 is attracted to the fixed iron core 120 side by the excitation of the first coil 110, the first movable iron core 134 plays a role of moving the pinion 14 described later in the direction of the ring gear 18 via the lever 17. Further, the spring 137 as the elastic means bends when the end faces of the pinion 13 and the ring gear 18 come into contact with each other, thereby causing the pinion 13 to move to the ring gear 18.
Press and urge in the direction.

Rotating shaft 16 of armature 11 of starter motor 10
A unidirectional clutch 13 and a pinion 14 are axially movable in the shaft. Then, the lever 17
The other end of the lever 1 is engaged with the clutch 13, and the lever 1
7 is rotatably installed around a fulcrum 17a. The pinion 14 is configured to mesh with a ring gear 18 of an engine (not shown) by moving to the right in the drawing, and the stopper 15 restricts the axial movement of the pinion 14.

The starter switch 2 of the timer means 20 is turned on.
The time t1 from when the pinion 14 engages with the ring gear 18 sufficiently deeply is measured, and after the time t1 elapses, the current from the battery 1 is supplied to the second coil 210 of the second electromagnet device 200. Normally, the start switch 2 is ON
Since the time required for the pinion 14 to engage with the ring gear sufficiently deeply is about 0.02-0.05 seconds, the delay time t1 by the timer means 20 is 0.02.
It is preferable to set the time within 0.2 seconds. If the time is shorter than this, the main contact 9 is closed before the pinion 14 is engaged with the ring gear 18 sufficiently deeply, and if the time is longer than that, the starting time is lengthened accordingly, and after turning on the starting switch 2, the engine is closed. This is because the delay time until the vehicle starts to turn is perceived as uncomfortable by the driver.

The second electromagnet device 200 includes the timer means 2
A second coil 210 to which electric power is supplied from the battery 1 via 0, and a second movable iron core 230 that is attracted to the second fixed iron core 220 side by exciting the second coil 210.
And a movable contact shaft 244 for connecting the movable contact 9C of the main contact 9 to the fixed contacts 9A and 9B in association with the attraction of the second movable iron core 230. In addition, the fixed contact 9 of the main contact 9
A is connected to the terminal of the battery 1 and fixed contact 9B is connected to the brush 11a of the armature 11 of the starting electric motor 10. When the main contact 9 is closed, the electric power of the battery 1 is supplied to the starting electric motor 10. It

The current control means 30 is the first electromagnet device 1
In order to limit the battery power supply to the starter motor 10 so that the armature 11 of the starter motor 10 rotates at a low speed from the start of the power supply to the first coil 110 of 00 until the main contact 9 is closed. And is connected in parallel with the main contact 9. Further, when the rotation of the armature 11 of the starting motor is controlled by the electric power supplied through the current control means 30, the torque T generated in the armature 11 is T> μ.
Control so as to be N · r. Here, μ is the coefficient of friction between the pinion end surface and the ring gear end surface, N is the force with which the pinion presses the ring gear, and r is the average radius of the contact portion of the pinion end surface with the ring gear.

FIG. 2 is a sectional view showing a concrete example of the structure of the first electromagnet device 100. In the figure, the first movable iron core assembly 133 includes a cylindrical first movable iron core 134 with a bottom, a hook 135 inserted in the first movable iron core 134, and a first movable iron core 134.
The movable iron core 134 includes a washer member 136 which is caulked and fixed to the opening spigot portion 134a, and a spring 137 suspended between the collar portion 135a provided at the bottom of the hook 135 and the washer member 136. The hook 135 has a cam 17 of the shift lever 17 at its front end.
The first movable iron core assembly 1 has a groove 135b with which b is engaged.
The leftward movement of 33 in the drawing elastically biases the shift lever 17 as described later. Reference numeral 135c is a shaft portion of the hook 135, and 135d is a locking portion that forms an engaging groove 135b of the hook 135. The cylindrical magnetic body case 138 supports the first movable iron core assembly 133 loosely on the inner peripheral surface of the front end thereof,
The cap 14 is attached to the spigot portion 138a of the case 138.
In addition to 0, the first fixed iron core 120 is caulked and fixed. The first coil 110 is an exciting coil wound around the inner peripheral surface of the case 138, and the battery 1
The moving iron core 134 is energized by the energization by the function of energizing the movable iron core 134 to the left in the drawing. The spring 150 is housed in the projection outer peripheral step 120a of the fixed iron core 120 and biases the first movable iron core assembly 133 to the right in the drawing.

FIG. 3 is a cross-sectional view showing a specific structural example of the second electromagnet device 200. In the drawing, a cylindrical magnetic body case 235 supports the second movable iron core 230 loosely on the inner peripheral surface of the front end portion thereof, and the cap 23 is provided in the opening of the inner peripheral surface of the front end portion.
6 is caulked and fixed, and the cap assembly 240 and the second fixed iron core 220 are caulked and fixed to the rear end portion 230a. The second coil 210 is an exciting coil wound around the inner peripheral surface of the case 235, and is energized and energized by a battery power source via the timer means 20 to move the movable iron core 230.
Plays a role of urging suction to the left in the figure. Spring 23
7 is a stepped portion 220a on the outer peripheral surface of the projection of the fixed core 220.
And the second movable iron core 230 is biased rightward in the drawing.
The movable contact assembly 243 is loosely fitted and supported in the hole 220b at the center of the second fixed iron core 220. The movable contact shaft 244 has a flange portion 244a and the movable contact shaft 244 is loosely fitted to the movable contact shaft 244. It is equipped with 9C. The movable contact 9C is
A spring point 246, one end of which is suspended on the collar portion 244a, is elastically pressed and urged so as to come into contact with a retaining ring 47 fitted to the movable contact shaft 244. 248
Is a spring return that urges the movable contact assembly 243 to the right in the figure, and 249 is a resin mold cap that constitutes the cap assembly 240.
I am wearing 9B.

FIG. 4 is a circuit block diagram showing an example of the current control means 30. The current control unit 30 of FIG. 4 detects the start of power supply to the first coil 110 of the first electromagnet device 100 (that is, the ON of the start switch 2) and also detects the closing of the main contact 9. / OFF detection unit 30
A, a pulse generator 30B that generates a pulse signal of a predetermined period and a predetermined width from the start of power supply to the first coil 110 to the closing of the main contact 9, and a pulse signal generated by the pulse generator 30B. A current control unit 30C is provided to control the amount of current by supplying the current from the battery 1 to the starting electric motor 10 when ON.

(Operation of First Embodiment) Next, the operation of the engine starter of the first embodiment will be described with reference to FIGS. 5 and 6. 5 is a diagram showing a state in which the start switch is turned on in the engine starter of FIG. 1, and FIG. 6 is a signal diagram showing an operation when the start switch is turned on. In FIG. 6, X1 is the facing gap of the pinion 14 and the ring gear 18 in the stationary state, X2 is the meshing allowance of the pinion 14 and the ring gear 18, t1 is the time measured by the timer means 20, and t2 is the second movable contact 220. Is the travel time of.

As shown in the figure, when the start switch 2 is turned on, the first coil 110 of the first electromagnet device 100 is connected to the battery 1 and a current flows through the first coil 110. Then, by the excitation of the first coil 110, the first movable iron core 134 is attracted and moved leftward in the drawing while bending a return spring (not shown). Along with the movement of the first movable iron core 134, the lever 17 rotates about the fulcrum 17a in the counterclockwise direction in the figure and pushes the clutch 13 to the right in the figure. Then, when the end surface of the pinion 14 comes into contact with the end surface of the ring gear 18, the first movable iron core 134 continues to move by the suction force of the first coil 110 and bends the spring 137 which is an elastic means. Therefore, the pinion 14 is pressed and urged toward the ring gear 18 by the elastic force of the spring 137.

In the timer means 20, the starting switch 2 is turned on.
After that, the time (t1 hour) is measured until the pinion 14 meshes with the ring gear 18 sufficiently deeply, and during the second time,
No electric current is supplied to the second coil 210 of the electromagnet device 200. Therefore, during that time (t1 hour), since the main contact 9 is open, the battery 1 to the starting motor 10
Is not powered. On the other hand, the current control means 30
Electric power of the battery 1 is supplied to the starting electric motor 10 so that the armature 11 of the starting electric motor 10 rotates at a low speed from the time when the starting switch 2 is turned on until the main contact 9 is closed. That is, in the current control means 30 of FIG.
The / OFF detection unit 30A detects ON of the start switch 2, the pulse generation unit 30B generates a pulse signal of a predetermined width and a predetermined cycle, and the current control unit 30C starts the current from the battery 1 when the pulse signal is turned ON. Supply to 10. At this time, the torque T generated in the armature 11 of the starting motor 10 is controlled so that T> μNr. However,
μ: friction coefficient between the pinion end surface and the ring gear end surface, N: force of the pinion pressing the ring gear, r: average radius of the contact portion of the pinion end surface with the ring gear. By controlling the current as described above, the pinion 14 becomes the ring gear 18
When the end surface of the spring rotates while sliding to reach the meshable position, the pressing force of the spring 134 causes the spring 15 to move in a sufficiently deep meshing direction until it comes into contact with the stopper 15.

Then, when the predetermined time t1 required for the pinion 14 to engage with the ring gear 18 sufficiently deeply has elapsed, the timer means 20 supplies a current to the second coil 210 of the second electromagnet device 200. When the second coil 210 is energized and excited, the second movable iron core 230 is attracted to the second fixed iron core 220 side. Then, the second movable contact 230
By pressing the movable contact shaft 244, the movable contact 9C and the fixed contacts 9A and 9B are closed, the current limiting circuit 30 is short-circuited, and the current from the battery 1 is supplied to the armature 11 of the starting electric motor 10. As a result, the starter motor 10 starts the engine (not shown) via the pinion 13 and the ring gear 14.

(Effects of First Embodiment) As described above, according to the first embodiment, the following effects are achieved. (1) The ring gear 1 rotates while the pinion 14 rotates at a low speed.
Batteries 1 after engaging with 8 and deep enough
Since a large current is supplied to start the engine, the impact noise due to the collision between the tooth surfaces of the pinion 14 and the ring gear 18 can be significantly reduced. (2) Since the pinion 14 meshes with the ring gear 18 sufficiently deeply and contacts the stopper 15, a large current is supplied from the battery 1, so that the pinion 14 and the stopper 15
Impact noise due to collision with can be significantly reduced. (3) Normally, since it takes about 0.02 to 0.05 seconds for the pinion to engage the ring gear deeply after the start switch is turned on, the delay time by the timer means is set to 0.02 to 0 seconds. The effects of (1) and (2) above can be obtained by setting the time within 2 seconds. If the set time is shorter than this, the contact is closed before the pinion is engaged with the ring gear sufficiently deeply, which causes the same problem as in the prior art. On the other hand, if it is longer than this, the starting time is simply lengthened accordingly, and the start switch 2
The delay time from when the engine is turned on to when the engine starts to turn is perceived as uncomfortable by the driver. (4) When the end surface of the pinion 14 collides with the end surface of the ring gear 18, the spring 137 presses and urges the pinion 14 toward the ring gear 18.
The collision sound is absorbed and reduced by 37. (5) From the above (1) to (4), wear and damage of each part of the pinion 14, the ring gear 18, and the stopper 15 are reduced. (6) By pressing the pinion 14 with the spring 137, the frictional force between the pinion 14 and the ring gear 18 is determined by the operating force of the spring 137, and the pinion 14 can be slid and engaged with the ring gear 18 even with a small current. Therefore, the capacity of the current control means 30 can be reduced. (7) Also, the first coil 11 of the first electromagnet device 100.
Since the attraction force of 0 may be small, the first coil 110 can be made compact and lightweight.

In contrast to the first embodiment, Japanese Patent No. 298
In Japanese Patent No. 8264, the starter motor is energized through a resistance element when a key switch is turned on, the starter motor is rotated at a low speed until the pinion gear meshes with the ring gear, and the contact mechanism short-circuits the resistance element after meshing to starter motor. There is disclosed a starting device for rotating the motor at a high speed. Further, in Japanese Unexamined Patent Publication No. 9-119365, a current limiting unit that limits a current supplied from a battery to a starter motor, a first switch that supplies a current to the starter motor through the current limiting unit, and a pinion as a ring gear. A second switch that, when substantially meshed, bypasses the current limiting means to energize the starter motor, and a time limit that stops energizing the current limiting means when the current energizing time reaches a predetermined time. A starting device comprising means is disclosed. However, Japanese Patent No. 2988264 or Japanese Patent Laid-Open No. 9-119365.
In the starting device disclosed in the publication, a spring for pressing the pinion in the ring gear direction when the end surface of the pinion contacts the end surface of the ring gear is not configured, and the force for pressing the pinion against the ring gear is Determined by suction power. This attractive force is proportional to the value of the current flowing through the coil, and is greatly affected by the battery condition, wiring resistance, etc. It is also affected by the distance between the movable core and the fixed core. Therefore, in order to reliably push the pinion against the ring gear and prevent the pinion from bouncing back, it is necessary to set the suction force of the coil high with a relatively large margin. Furthermore, when trying to engage the pinion with the ring gear by rotating the motor at a low speed, it is necessary to generate a rotational force that is greater than the frictional force between the pinion and the ring gear. There is. As a result, it is necessary to increase the capacity of the resistance element or the current limiting means. In addition, the impact sound generated when the pinion, which overcomes the frictional force and starts rotating, collides with the tooth surface of the ring gear or the stopper, becomes loud. Also, in the device that does not configure the spring as described above,
There is nothing that absorbs the impact when the end face of the pinion collides with the end face of the ring gear, and as a result, the impact sound becomes loud.

Embodiment 2. FIG. 7 is a schematic configuration diagram showing an engine starting device according to a second embodiment of the present invention.
In the figure, the first current control means 100A is arranged between the starting switch 2 and the first coil 110 of the first electromagnet device 100, and the pinion 14 is engaged with the ring gear 18 by the timer means 20 sufficiently deeply. After measuring the time (t1 hour), that is, after the first movable iron core 134 of the first electromagnet device 100 contacts the first fixed iron core 120, it plays a role of limiting the current from the battery 1 to the first coil 110. Fulfill. The current limit value by the first current control means 100A is set to the minimum current value at which the first movable iron core 134 of the first electromagnet device 100 can keep contacting the first fixed iron core 120.

The second current control means 200A includes the timer means 20 and the second coil 2 of the second electromagnet device 200.
10 is arranged between the movable contacts 9C of the main contact 9 and the fixed contacts 9A and 9B, that is, the second contact
After the second movable iron core 230 of the electromagnet device 200 comes into contact with the second fixed iron core 220, the battery 1 to the second coil 2
It is a means of limiting the current to 10. The current limit value by the second current control means 200A is the minimum current value at which the second movable iron core 230 of the second electromagnet device 200 can keep contacting the second fixed iron core 220. The other configurations and operations are the same as those in the first embodiment, and thus the description thereof will be omitted.

As described above, according to the second embodiment, the first electromagnet device 1 is controlled by the first current control means 100A.
Since the first movable iron core 134 of No. 00 contacts the first fixed iron core 120 and limits the current from the battery 1 to the first coil 110, heat generation of the first coil 110 can be reduced and heat resistance can be reduced. It is possible to improve the property. In addition, the second movable iron core 230 of the second electromagnet device 200 is changed to the second fixed iron core 220 by the second current control means 200A.
Since the current from the battery 1 to the second coil 210 is limited after the contact with, the heat generation of the second coil 210 can be reduced and the heat resistance can be improved. As a result, the power consumption of the starting device is reduced, and the efficiency of the starting device can be improved.

Embodiment 3. FIG. 8 is a diagram showing the arrangement of the first and second electromagnet devices according to the third embodiment of the present invention. In the third embodiment, the first electromagnet device 100 and the second electromagnet device 200 are coaxially arranged. That is, the first coil 110 of the first electromagnet device 100, the first coil 110
Movable iron core 134, first fixed iron core 120, second coil 210 of second electromagnet device 200, second movable iron core 23.
0, the second fixed iron core 220, and the movable contact shaft 244 are arranged coaxially.

According to the third embodiment, since the first electromagnet device 100 and the second electromagnet device 200 are coaxially arranged, the layout of the entire starting device is improved and the starting device becomes compact.

Fourth Embodiment 9 and 10 are views showing the arrangement of the first and second electromagnet devices according to the fourth embodiment of the present invention. In the fourth embodiment, as in the third embodiment, the first electromagnet device 100 and the second electromagnet device 200 are arranged coaxially, and the first electromagnet device 100 and the second electromagnet device 200 are disposed between the first electromagnet device 100 and the second electromagnet device 200. A non-magnetic rod 300 is provided. The rod 300 is pressed by the first movable iron core 134 when the first movable iron core 134 is attracted to the first fixed iron core 120 by the excitation of the first coil 110, and the second movable iron core of the second electromagnet device 200 is also pressed. 230 is moved by a distance L1. As a result, the second electromagnet device 2
In 00, the main contact 9 is closed by exciting the second coil 210 to move the second movable iron core 134 and the movable iron core shaft 244 by the distance (L-L1).

According to the fourth embodiment, the first coil 110 of the first electromagnet device 100 is energized, and the first movable iron core 1
Before the abutment of 34 on the first fixed core 120
And the rod 300 moves the second movable iron core 230 in the direction of the main contact leaving a distance (L-L1) at which the main contact 9 does not close.
Even if the attraction force of the second coil 210 is small, the main contact 9 can be closed, and the second electromagnet device 200 can be reduced in size and weight. Further, since the first movable iron core 134 comes into contact with the rod 300 before coming into contact with the first fixed iron core 120, and the speed of the first movable iron core 134 is reduced there,
The impact noise when colliding with the fixed iron core 120 is reduced.

Other Embodiments. In the above-described embodiment, ON / OFF of the pulse signal is used as the current control means.
Although the current supply is controlled by the width, the current control device may be configured by a resistor such as a coil. Further, instead of the timer means, a sensor for detecting that the pinion meshes with the ring gear sufficiently deeply may be provided.

[0041]

According to the inventions of claim 1 and claim 2,
When the start switch is turned on, first, the first coil of the first electromagnet device is energized, and the first coil is excited to make the first coil excited.
The movable iron core is attracted to move the pinion in the ring gear direction via the lever. When the end faces of the pinion and the ring gear come into contact with each other, the elastic means bends and presses the pinion toward the ring gear. Then, the pinion is engaged with the ring gear while rotating at a low speed by the current control means. After that, the pinion is engaged with the ring gear sufficiently deeply by the timing of the timer means, and then the current from the battery is changed to the second
Is supplied to the electromagnet device to start the engine. Therefore, the impact noise caused by the collision between the tooth surfaces of the pinion and the ring gear can be significantly reduced. In addition, since the battery current is supplied to the second electromagnet device after the pinion meshes with the ring gear sufficiently deeply and comes into contact with the stopper, the impact noise due to the collision between the pinion and the stopper can be significantly reduced. Further, when the end surface of the pinion collides with the end surface of the ring gear, the elastic means presses and urges the pinion in the ring gear direction, so that the elastic means absorbs and reduces the collision sound. From the above, Pinion,
It has an effect of reducing wear and damage of each part of the ring gear and the stopper. Further, by pressing and urging the pinion with the elastic means, the frictional force between the pinion and the ring gear is determined by the operating force of the elastic means, and the pinion is slid even if the current supplied to the first coil of the first electromagnet means is small. Since it can be engaged with the ring gear, the capacity of the current control means can be small. Further, since the suction force of the first coil does not need to be small, the coil can be made compact and lightweight.

According to the third aspect of the present invention, the delay time t1 by the timer means is set to 0.02 seconds <t1 <0.2 seconds, so that the pinion is sufficiently attached to the ring gear after the start switch is turned on. Can engage deeply.

According to the fourth aspect of the present invention, the first current control means is provided, and the first movable iron core of the first electromagnet device is the first
Since the current from the battery to the first coil is limited after the contact with the fixed iron core, the heat generation of the first coil can be reduced and the heat resistance can be improved. As a result, the power consumption of the starting device is reduced, and the efficiency of the starting device can be improved.

According to the invention of claim 5, the second current control means is provided so that the second movable iron core of the second electromagnet device is the second.
Since the current from the battery to the second coil is limited after the contact with the fixed core, the heat generation of the second coil can be reduced and the heat resistance can be improved. As a result, the power consumption of the starting device is reduced, and the efficiency of the starting device can be improved.

According to the sixth aspect of the present invention, the current control means controls the current supply by the ON / OFF width of the pulse signal. Therefore, the current control can be performed with a simple configuration and the resistor such as a coil is used. The size and weight can be reduced as compared with the configuration described above.

According to the invention of claim 7, since the first electromagnet device and the second electromagnet device are arranged on the same axis, the layout of the entire starting device is improved, and the starting device is compact. is there.

According to the invention of claim 8, the first movable iron core comes into contact with the rod before coming into contact with the first fixed iron core, and this rod leaves the main contact with a distance such that the main movable contact does not close the second movable iron core. Since it is moved in the direction, the main contact can be closed even if the attractive force of the second coil of the second electromagnet device is small, and the second electromagnet device can be reduced in size and weight. Further, since the first movable iron core comes into contact with the rod before coming into contact with the first fixed iron core, and the speed of the first movable iron core is reduced there, the impact sound at the time of collision with the first fixed iron core is reduced. There is.

According to the invention of claim 9, instead of the timer means, a sensor for detecting that the pinion meshes with the ring gear sufficiently deeply is provided. Therefore, it is possible to accurately determine that the pinion meshes sufficiently deeply with the ring gear. Can be detected.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an engine starting device according to a first embodiment of the present invention.

FIG. 2 is a sectional view showing a specific configuration example of a first electromagnet device according to the present invention.

FIG. 3 is a sectional view showing a specific structural example of a second electromagnet device according to the present invention.

FIG. 4 is a circuit block diagram showing an example of a current control means according to the present invention.

5 is a schematic configuration diagram showing a state in which a start switch is turned on in the engine starter of FIG. 1. FIG.

FIG. 6 is a signal diagram showing an operation of the engine starter according to the first embodiment of the present invention.

FIG. 7 is a schematic configuration diagram showing an engine starting device according to a second embodiment of the present invention.

FIG. 8 is a diagram showing an arrangement of an electromagnet device according to a third embodiment of the present invention.

FIG. 9 is a diagram showing an arrangement of an electromagnet device according to a fourth embodiment of the present invention.

FIG. 10 is a diagram showing an arrangement of an electromagnet device according to a fourth embodiment of the present invention.

FIG. 11 is a schematic configuration diagram showing a conventional engine starter.

[Explanation of symbols]

1 battery, 2 start switch, 9 main contacts, 10
Starter motor, 14 pinion, 15 stopper, 16
Rotary shaft, 17 lever, 18 ring gear, 20 timer means, 30, 100A, 200A current control means, 1
00 first electromagnet device, 110 first coil, 120
First fixed iron core, 134 First movable iron core, 135 Hook, 200 Second electromagnet device 200, 210 Second coil 210, 220 Second fixed iron core, 230 Second movable iron core, 244 Movable contact shaft, 300 Rod.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Masaaki Kamaya             2-3 2-3 Marunouchi, Chiyoda-ku, Tokyo             Inside Ryo Electric Co., Ltd.

Claims (9)

[Claims] 1. A starting electric motor for rotationally driving a pinion meshing with a ring gear of an engine; a first coil to which electric power is supplied from a battery when a starting switch is turned on; and a first fixed iron core side by excitation of the first coil. A first electromagnet device having a first movable iron core that is attracted and moves the pinion in the ring gear direction via a lever, and elasticity that bends when the end faces of the pinion and the ring gear contact each other and presses and urges the pinion in the ring gear direction. Means, a timer means for measuring a time t1 from when the start switch is turned on until the pinion engages with the ring gear sufficiently deeply, and a battery current is supplied after the time t1 has elapsed.
A coil, a second movable iron core that is attracted toward the second fixed iron core by the excitation of the second coil, and a main contact that connects and disconnects in conjunction with the movement of the second movable iron core to turn on / off the power supply from the battery to the starting motor. A second electromagnet device provided and current control means for controlling the current to the starting motor so as to rotate the starting motor at a low speed from the start of energization of the first coil to the closing of the main contact. A starting device for an engine. 2. In the current control by the current control means, the torque T generated in the starting motor by the supplied current is T
The starting device for the engine according to claim 1, characterized in that> μNr. Here, μ: Coefficient of friction between the pinion end face and the ring gear end face N: Force by which the pinion presses the ring gear r: Average radius of the contact portion of the pinion end face with the ring gear. 3. The engine starting device according to claim 1, wherein the delay time t1 by the timer means is 0.02 seconds <t1 <0.2 seconds. 4. The first movable core of the first electromagnet device is the first.
The first current control means for limiting the supply of the current from the battery to the first coil after the contact with the fixed iron core is provided, and the first current control means is provided in any one of claims 1 to 3. Engine starter. 5. The second movable iron core of the second electromagnet device is the second
The second current control means for restricting the supply of the current from the battery to the second coil after contacting the fixed iron core is provided, and the second current control means is provided in any one of claims 1 to 4. Engine starter. 6. The current control means turns on a pulse signal.
The starting device for an engine according to any one of claims 1 to 5, wherein the supply of current is controlled by the ON / OFF width. 7. A starting electric motor for rotationally driving a pinion meshing with a ring gear of an engine, a first coil to which electric power is supplied from a battery when a starting switch is turned on, and a first fixed core side by excitation of the first coil. A first electromagnet device having a first movable iron core that is attracted and moves the pinion in the ring gear direction via a lever, and a timer that measures the time t1 from when the start switch is turned on until the pinion meshes deeply with the ring gear. Means and second battery current is supplied after the time t1
A coil, a second movable iron core that is attracted toward the second fixed iron core by the excitation of the second coil, and a main contact that connects and disconnects in conjunction with the movement of the second movable iron core to turn on / off the power supply from the battery to the starting motor. A starting device for an engine, comprising: a second electromagnet device provided, wherein the first electromagnet device and the second electromagnet device are coaxially arranged. 8. The first coil of the first electromagnet device is energized to contact the rod before the first movable iron core contacts the first fixed iron core, and the rod does not close the second movable iron core with the main contact. The starting device for an engine according to claim 7, wherein the starting device is configured to be moved in the contact direction leaving a distance. 9. The engine according to claim 1, further comprising a sensor for detecting that the pinion meshes with the ring gear sufficiently deeply, instead of the timer means. Starter.