JPS6349563Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a starting motor, and particularly to a starting motor in which one field pole is configured to be rotatable. The configuration of a conventional starter motor of this type is shown in FIG. That is, in FIG. 1, 1 shows the entire starter motor of the so-called pole shift method in which one field pole can be rotationally shifted, and 2 shows the DC motor with this movable pole 3. An electric motor, 4 is a shift lever whose intermediate portion is rotatably supported by a shaft 4a, and one end thereof holds the movable pole 3; 5 is an armature of the DC motor 2; 6 is a rotation of this armature 5; an output shaft; 7 is an overrunning clutch that is spline-engaged on the rotary output shaft 6 so as to be able to slide back and forth; and 8 is a front bracket;
Reference numeral 9 denotes a return spring interposed between the shift lever 4 and the front bracket 8 in order to apply return force to the movable pole 3, 10 a coil attached to the yoke 11, and 12 a rotation of the movable pole 3. 14 is a pinion that is rotationally engaged in one direction with the overrunning clutch 7; 15 is an internal combustion engine that meshes and engages the pinion 14 with the operation of the shift lever 4; Ring gear of engine (not shown), 16
17 is a stopper that regulates the sliding position of the pinion 14; 17 is a sleeve bearing that is attached to the inner surface of the front end of the front bracket 8 and pivotally supports the front end of the rotary output shaft 6; and 18 and 19;
are the core and coil of the armature 5, 20 is a commutator at the rear of the rotary output shaft, 21 is a brush thereof, 22 is a rear bracket, and 23 is attached to the inner surface of the central protruding portion 22a of the rotary output shaft 6. A sleeve bearing pivotally supports the rear end, and 24 is a cover. However, in the case of the conventional configuration, when the armature 5 and the coil 10 are energized, the movable pole 3 is first attracted toward the armature 5 against the return spring 9, and the shift lever 4 is moved around the shaft 4a. The overrunning clutch 7 is biased to rotate counterclockwise.
is slid forward on the rotary output shaft 6, and its pinion 14 is brought into meshing engagement with the ring gear 15, while the contact 12 is closed by the lever 13,
The DC motor 2 is energized with a main current, and its rotational force is transmitted from the rotary output shaft 6 to the pinion 14 to drive the ring gear 15 to start the engine. In this conventional device, the movable pole 3
Take out the suction rotation operation to shift lever 4,
Since the overrunning clutch 7 is slid forward, the structure is not only complicated, but also the device itself is large and heavy. In view of these conventional drawbacks, this invention uses an inertial sliding type overrunning clutch and a stopper member that interlocks with a rotating magnetic pole.
By regulating the return of the overrunning clutch after this sliding movement, it is an object of the present invention to provide a starter motor of this type which is simplified in structure and reduced in size and weight. Hereinafter, one embodiment of the starter motor according to this invention will be described in detail with reference to FIG. 2. In the embodiment shown in FIG. 2, reference numeral 25 designates the entire starting motor of the embodiment, 26 a DC motor fixed to the front machine frame 27, and 28 a movable magnetic pole constituting one pole of the field magnetic pole. It consists of a pole 29, a movable plate 30 made of a mild steel plate member that fixes the pole 29 to its inner surface, and a coil 31 wound around the pole 29, and a support pin at the rear end of the movable plate 30. 32 is pivotably supported on a support plate 33 on a yoke 34 to be rotatable. Movable plate 3 of the yoke 34
An opening through which the pole 29 and the coil 31 face is provided in the area where the pole 29 faces. Further, 35 is an armature of the DC motor 26, and 36
is a rotational output shaft of this armature 35 , 37 is an overrunning clutch that is engaged with a helical spline on this rotational output shaft 36, and a clutch outer 38
is fitted into a sleeve bearing 39 fitted into the central through hole 27a of the machine frame 27 so as to be slidable in the axial direction, and a cam 3 formed on the inner circumferential surface of the front end thereof.
A roller 40 is inserted between the clutch inner 41 and the clutch inner 41, and the pinion 42 at the front end of the clutch inner 41 can be rotated in only one direction. The rotary output shaft 36 is slidable in the axial direction. Further, 44 is a holding member that holds the roller 40, clutch inner 41, and pinion 42 on the clutch outer 38, 45 is a return spring that is supported by a spring receiver 46 and urges the overrunning clutch 37 to return, and 47 is the rotation output shaft. The spring receiver 4 is engaged with the shaft end groove 36a of 36.
This is a stopper ring that holds 6 in place. Further, numeral 48 is a stopper member disposed such that its upper end is in contact with the front end of the movable plate 30 of the movable magnetic pole 28 , and its lower end can regulate the forward position of the overrunning clutch 37; 50 is a coil spring that constantly presses the stopper member 48 upward, and 51 is a case cylinder that guides the armature 35 in the direction.
, 52 is an armature coil wound around this iron core 51, 53 is a commutator to which this coil 52 is connected, 54 is a brush that is in sliding contact with this commutator 53,
Reference numeral 55 denotes a sleeve bearing that supports the rear shaft end of the rotary output shaft 36, and is fitted into the central through hole 34b of the rear wall 34a of the yoke 34. Note that 56 is a cover. In the case of the above embodiment configuration, when the armature 35 and the coil 31 are energized, the movable magnetic pole 28 is first actuated downward against the coil spring 50, and at the same time, the armature 35 is rotated. do,
An overrunning clutch 37 engaged with a helical spline on a rotating output shaft 36 is slid forward by its rotational inertia, and its front end pinion 42 is engaged with a ring gear of an internal combustion engine (not shown here). The stopper member 4 is engaged and pushed out as the movable magnetic pole 28 moves downward.
The lower end of 8 is this overrunning clutch 37
The rear end surface is held at the same position, that is, the position where the pinion 42 is meshed with the ring gear, by resisting the return force of the return spring 45, and the engine is started in this state. After the engine is started, the pinion 42 is urged to rotate in the opposite direction by the ring gear, but due to this reverse rotation, only the pinion 42 and the clutch inner 41 are free to rotate at that position due to the unidirectional rotational engagement action of the roller 40. As a result, the armature 35 rotates without load. Then, if we wait for this engine to start and cancel the energization,
The movable magnetic pole 2 is moved by the return force of the coil spring 50.
8 and the stopper member 48 return to release the overrunning clutch 37 from its fixed position, and then the overrunning clutch 37 is also returned to the state shown in the drawing by the return spring 45. In this way, the ring gear of the pinion 42 is Disengagement after engagement can be reliably prevented by the stopper member. In the embodiment described above, the movable magnetic pole 28 and the stopper member 48 are provided separately, but it goes without saying that they may be integrated into one structure. As explained above, according to this invention, one pole of the field pole of the DC motor is constituted by a pole fixed to a movable plate and a coil wound around this pole and facing the opening of the yoke. The movable magnetic pole is provided with a stopper member that is linked to the rotation of the movable magnetic pole, and by the operation of this stopper member,
The inertia sliding type overrunning clutch is engaged with a helical spline on the rotational output shaft, and the pinion is unidirectionally rotationally engaged with the ring gear, so that the return of the pinion after the meshing engagement with the ring gear is regulated. Maintaining meshing engagement when starting the engine,
It is possible to reliably control the release of the meshing engagement after the same start. Therefore, the structure can be simplified compared to a structure using a conventional shift lever, and by having the coil face the opening of the yoke, it can be brought close to the yoke and armature, making it easy to move. Since the magnetic pole mounting part can be prevented from protruding in the outer radial direction,
The device can be made smaller and lighter.

[Brief explanation of the drawing]

FIG. 1 is a side view showing a main part of a conventional starter motor cut away, and FIG. 2 is a half-cut sectional view showing an embodiment of the starter motor according to this invention. 28 ...Movable magnetic pole, 29...Pole, 30...
Movable plate, 31... Coil, 32... Support pin, 3
4... Yoke, 35 ... Armature, 36... Rotating output shaft, 37 ... Overrunning clutch, 38...
...Clutch outer, 40...Roller, 41...Clutch inner, 42...Pinion, 45...Return spring, 48...Stopper member, 49...Case tube, 50...Coil spring.

Claims (1)

[Scope of utility model registration request] One pole of the field magnetic pole faces a pole 29 fixed to the inner surface of a movable plate 30 which is pivotally attached to the outer peripheral surface of the yoke 34 and an opening provided in the yoke 34 wrapped around the pole 29. A DC motor 26 is configured with a coil 31 to form a movable magnetic pole 28, and a pinion 42, which is engaged with a helical spline on a rotating output shaft 36 of the DC motor 26 and corresponds to a ring gear for starting the engine, is oriented in one direction. An overrunning clutch 37 of an inertial sliding type that is rotationally engaged and supported, and a stopper member 48 that is interlocked with the movable plate 30 of the movable magnetic pole 28 and restricts and restricts the state of meshing engagement of the pinion 42 with the ring gear. A starting motor characterized by: