JPS636462Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a starting device for an internal combustion engine, and more particularly to a new starting device for an internal combustion engine having a shift mechanism for a shift lever that transfers an overrunning clutch.

FIG. 1 is a side sectional view showing a conventional starting device for an internal combustion engine. In FIG. 1, a DC motor 1 constitutes a starting motor, and is composed of the following components. The field device 2 includes a cylindrical yoke 3, a field magnetic pole 4 fixed to the inner peripheral surface of the yoke 3, and a field coil 5 wound around the field magnetic pole 4.
The armature 6 is rotatably supported within the field device 2,
An armature core 7, a rotating shaft 8 fixed to the armature core 7, and an armature coil 9 attached to the armature core 7.
It is equipped with Commutator 10 is attached to rotating shaft 8 and connected to armature coil 9. brush 1
Reference numeral 1 is for slidingly contacting the commutator 10 to energize the armature coil 9, and is held by a brush holder 12 and attached to a rear bracket 13. The rear bracket 13 is attached to the yoke 3 so as to close the rear end opening of the yoke 3, and is attached to the rear end 80 of the rotating shaft 8.
1 rotatably supported via a sleeve bearing 14. The front bracket 15 is attached to the yoke 3 so as to close the front end opening of the yoke 3, and connects the front end 802 of the rotating shaft 8 via the sleeve bearing 16 through a through hole 152 formed in the nose portion 151. It is rotatably supported. The overrunning clutch 17 is spline engaged with the rotating shaft 8,
It is attached to the rotating shaft 8 so as to be slidable in the front and rear directions. Pinion 18 is overrunning clutch 1
7 for one-way rotation, and meshes with a ring gear (not shown) of the internal combustion engine when the overrunning clutch 17 is moved forward (to the right in the figure). The stopper 19 is engaged with the rotating shaft 8 and stops the forward movement of the pinion 18. The thrust washer 20 is slidably engaged with the stopper 19 and transmits the impact force of the stopper 19 to the front bracket 15. Electromagnetic switch 2
1 is attached to the front bracket 15, and when it is energized, the plunger 22 is connected to the electromagnetic switch 21.
At the same time, the main contact (not shown) is closed by the attraction of the plunger 22, and the field coil 5 is energized via the conductor 23. The shift lever 24 has a rotation fulcrum portion 241 rotatably supported by a holder 25.
One end 242 thereof is engaged with plunger 22;
The other end 243 is the overrunning clutch 1
7 is engaged. The lever spring 26 elastically presses the holder 25, and the grommet 27 constitutes a pressure receiving surface of the lever spring 26.

Next, the operation will be explained. Electromagnetic switch 21
is energized and the plunger 22 is activated as the electromagnetic switch 2.
1, the shift lever 24 rotates counterclockwise around its rotation fulcrum 241. Therefore, the overrunning clutch 17 is moved forward (to the right in the figure) by the other end 243 of the shift lever 24, and the pinion 18 meshes with a ring gear (not shown) of the internal combustion engine. At this time, the main contact (not shown) of the electromagnetic switch 21 is closed by the plunger 22, and the field coil 5 is energized from the capacitor (not shown), causing the armature 6 to generate rotational force. This rotational force is transmitted to the ring gear (not shown) of the internal combustion engine via the rotating shaft 8, overrunning clutch 17, and pinion 18.
The internal combustion engine is started.

The conventional starter device is constructed as described above, and the thrust of the shift mechanism that moves the overrunning clutch 17 forward is transferred to the expensive and heavy electromagnetic switch 2.
1, the starting device had the disadvantage of being expensive and heavy.

This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and the purpose is to provide a starting device for an internal combustion engine having a novel shift mechanism. An embodiment of this invention will be described below with reference to the drawings.

FIG. 2 is a partial side sectional view showing an embodiment of the main parts of the starting device for an internal combustion engine according to this invention, FIG. 3 is a longitudinal sectional view of only the movable magnetic pole portion of FIG. 2, and FIG. FIG. 4 is an electrical wiring diagram of the main components shown in FIGS. In the drawings, the same or corresponding parts as in FIG. In FIGS. 2 to 4, the movable magnetic pole 28 constitutes one of the field magnetic poles 4 of the DC motor 1, and one end thereof is fixed to one end 242 of the shift lever 24', and the movable magnetic pole 28 is normally the second The opening 3 is open as shown in the figure, and is bored in the outer peripheral surface of the yoke 3 when the key switch 36 shown in FIG. 4 is closed.
01, and is composed of the following components. That is, a yoke piece 29 that closes the opening 301 of the yoke 3, a field magnetic pole 30 which is made of a permanent magnet member fixed to the inner peripheral surface of the yoke piece 29 and has low coercive force and high magnetic flux density characteristics, and a field magnetic pole 30 A pole tip 31 made of a soft iron member is fixed to the inner peripheral surface of the pole, and a fourth pole is wound around the field magnetic pole 30 and the pole tip 31.
Current coil 321 and voltage coil 3 as shown in the figure
22, and a shunt coil 33 wound around the pole chip 31. The main contacts 34 include a pair of fixed contacts 341 and 342 fixed to the yoke 3 or the rear bracket 13 as shown in FIG. 4, and a pair of fixed contacts 341 and 342 fixed to the other end of the movable magnetic pole 28 as shown in FIG. It consists of a movable contact 343 that closes between fixed contacts 341 and 342. The tension spring 35 is stretched between the front bracket 15 and the shift lever 24', and normally opens the movable magnetic pole 28 as shown in FIG. The key switch 36 is the field coil 3
The connection point between the current coil 321 and the voltage coil 322 of No. 2 is connected between the anode of the storage battery 37 whose cathode is grounded, and the other end of the voltage coil 322 is grounded. The fixed contact 341 of the main contact 34 is connected to the anode of the storage battery 37, and the fixed contact 342 is connected to the current coil 3.
It is connected to the other end of 21. Shunt coil 33
is connected between the fixed contact 342 and ground, and is connected in parallel to the armature 6. Note that the current coil 32
The number of windings of voltage coil 322 is greater than the number of windings of voltage coil 322 .

Next, the operation will be explained. Now, when the key switch 36 is closed in FIG. 4, current flows through the current coil 321, the voltage coil 322, and the shunt coil 33 in the direction of the solid arrow, and the movable magnetic pole 28 is excited, and the movable magnetic pole 28 is energized as shown in FIG. Tension spring 3 shown in
It closes by overcoming the spring force of 5. Therefore, the shift lever 24' rotates counterclockwise about the pivot point 241, moves the overrunning clutch 17 and the pinion 18 forward, and moves the overrunning clutch 17 and the pinion 18 forward.
meshes with the ring gear (not shown) of the internal combustion engine. At this time, the movable contact 343 of the main contact 34 is closed between the pair of fixed contacts 341 and 342, the armature 6 and the shunt coil 33 are energized, and the armature 6 rotates. This rotation starts the internal combustion engine. When the key switch 36 is opened after starting the internal combustion engine, a reverse current flows in the direction of the dotted line from the storage battery 37 to the current coil 321 of the field coil 32 via the main contact 34. Since the number of windings of the current coil 321 is set in advance to be greater than the number of windings of the voltage coil 322, the movable magnetic pole 28 is reversely excited and the movable magnetic pole 28 is moved to the second position by the spring force of the tension spring 35 shown in FIG. The main contact 34 is opened to the state shown in the figure, and the movable contact 343 of the main contact 34 is released from the pair of fixed contacts 341 and 342. Therefore, the current supply to the armature 6 is suddenly cut off, and the rotation of the armature 6 is stopped. At this time, as the movable magnetic pole 28 opens, the shift lever 24'
The overrunning clutch 17 and the pinion 18 are rotated clockwise about the rotation fulcrum 241 to move the overrunning clutch 17 and the pinion 18 rearward, thereby disengaging the pinion 18 from the ring gear (not shown) of the internal combustion engine.

This idea is constructed as described above, and has two movable magnetic poles.
8, the field magnetic pole 30 is a permanent magnet with low coercive force and high magnetic flux density properties, and the pole chip 31 is made of a soft iron member, and the voltage coil 322 and shunt coil 33 are wound around the movable magnetic pole 28. magnetic flux obtained by the pole tip 31 made of a soft iron member, the current coil 321 and the voltage coil 32
The combined excitation force with the magnetic flux of the field magnetic pole 30 made of a permanent magnet material excited by the armature 6
It acts as an exciting force. Therefore, there is no need for ineffective current consumption to attract the plunger 22 to the electromagnetic switch 21 as in the past, and the storage battery 37
The output of the starter motor can be increased without wasteful consumption of the excitation current from the current coil 321 to the voltage coil 322 and the shunt coil 33. Furthermore, since the field magnetic pole 30 fixed to the inner peripheral surface of the movable magnetic pole 28 is made of a permanent magnet material with low coercive force and high magnetic flux density, the deenergizing and excitation force of the movable magnetic pole 28 by the current coil 321 is small. Main contact 3
It is possible to obtain excellent controllability with respect to the release of No. 4, to obtain stable performance during operation, and to downsize the device.

FIG. 5 is another electrical wiring diagram of the main components shown in FIGS. 2 and 3. In FIG. 5, external resistor 322' is connected to key switch 36 and current coil 3.
21 and the ground. That is, the voltage coil 322 of the embodiment shown in FIG.
An external resistor 322' is used instead of
Its behavior remains unchanged.

As described above, this invention has various effects such as efficient and stable operating performance, excellent controllability, and miniaturization of the device.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view showing a conventional starting motor for an internal combustion engine, and FIG. 2 is a partial side sectional view showing an embodiment of the main part of the starting motor for an internal combustion engine according to this invention.
Figure 3 is a vertical cross-sectional view of only the movable magnetic pole part in Figure 2;
FIG. 4 is an electrical connection diagram of the main components shown in FIGS. 2 and 3, and FIG. 5 is another electrical connection diagram of the main components shown in FIGS. 2 and 3. In the figures, the same parts or equivalent parts in each figure are given the same symbols or dashes. 1 is the DC motor, 2 is the field device, 3 is the yoke, 301 is the opening, and 4 is the field. Magnetic pole, 6 armature, 8 rotating shaft, 15 front bracket, 1
7 is an overrunning clutch, 18 is a pinion, 24' is a shift lever, 241 is a rotation fulcrum,
242 is one end, 243 is the other end, 28 is a movable magnetic pole, 29 is a yoke piece, 30 is a field magnetic pole, 31 is a pole tip, 32 is a field coil, 321 is a current coil, 322 is a voltage coil, 322' is a external resistance,
33 is a shunt coil, 34 is a main contact, 341, 34
2 is a pair of fixed contacts, 343 is a movable contact, 35 is a tension spring, 36 is a key switch, and 37 is a storage battery.

Claims (1)

[Claims for Utility Model Registration] (1) A yoke constituting the frame of a DC motor and having an opening on its outer peripheral surface, one end of which is rotatably attached to the yoke so as to cover the opening. The movable magnetic pole is constructed by winding a field coil around a field magnetic pole made of a permanent magnet material with low coercive force and high magnetic flux density, and constitutes one pole of the field magnetic pole of the DC motor, and the other movable magnetic poles. a movable contact that is provided at an end facing a fixed contact installed on the yoke or a fixed object, and that closes to the fixed contact when the field coil is excited to form a main current circuit of the DC motor; Starting an internal combustion engine comprising a shift lever having one end locked to the movable magnetic pole and the other end engaging the overrunning clutch so as to move the overrunning clutch, and a spring that normally opens the movable magnetic pole. Device. (2) A field coil wound around the movable magnetic pole is connected in series with the key switch, a current coil connected in parallel to the main contact, and a voltage coil connected between the connection point of the current coil and the key switch and ground. The internal combustion engine according to claim 1, wherein the movable magnetic pole is wound with a shunt coil connected in series to the main contact and connected in parallel to the armature of a DC motor. Engine starting device. (3) The starting device for an internal combustion engine according to claim (2), wherein the number of windings of the current coil is greater than the number of windings of the voltage coil. (4) On the inner circumferential surface of the field magnetic pole made of permanent magnet material,
A starting device for an internal combustion engine according to claim (1), to which a pole tip made of a mild steel member is fixed.