JPS6330216Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a Bendex-type inertial sliding starter motor with a permanent magnet as a field pole.

Conventionally, there has been a starter motor of this type as shown in FIG. In this figure, 1 is the armature, 2
is a rotating shaft, and an overrunning clutch 3 is spline-engaged with a helical spline 2a formed on the front portion (right side in the figure) of the rotating shaft. Reference numeral 4 indicates a pinion that is engaged with the overrunning clutch 3 in one direction, 5 indicates a friction plate that comes into sliding contact with the housing 3a of the overrunning clutch 3, and 6 indicates a sliding contact between the housing 3a and the friction plate 5. A coil spring energizes the contact force and the overrunning clutch 3 to return to the original state and slide into contact. 7 is a cylindrical stopper that accommodates the coil spring 6 and locks the overrunning clutch 3. It is locked to the front end of the rotating shaft 2 of 1 by a ring (not shown). 8 is a part of a ring gear of an engine (not shown).

Next, the operation will be explained.

When the armature 1 is rotated, the overrunning clutch 3 is rotated by the screw action of the helical spline 2a due to the sliding contact between the housing 3a of the overrunning clutch 3 and the friction plate 5 due to the biasing force of the coil spring 6, and the inertia force. Protrudes forward (to the right in the figure).
This protruding force causes the pinion 4 to engage with the ring gear 8, and the screw action of the helical spline 2a further promotes the engagement of the pinion 4, causing the stopper 7 to engage.
The pinion 4 protrudes to a contact position, and the rotational force of the armature 1 is transmitted to the ring gear 8 via the rotating shaft 2, helical spline 2a, overrunning clutch 3, and pinion 4, and the engine (not shown)
is cranked. After the engine starts, the rotation biasing force of the armature 1 is released, the rotational speed of the ring gear 8 exceeds the rotational speed of the pinion 4, and the drag torque (residual torque) of the overrunning clutch 3 is generated.
The helical spline 2a is returned to its original position by screw action. This return force is also applied simultaneously by the coil spring 6, so that the overrunning clutch 3 is returned to the state shown, and the pinion 4 is disengaged from the ring gear 8.

In this way, the conventional starter motor has a pinion 4
It is difficult to set the inertial force of the overrunning clutch 3, which affects the protrusion action of the overrunning clutch 3, the frictional protrusion force between the casing 3a and the friction plate 5, and the stress of the coil spring 6 that biases the overrunning clutch 3 to return. There were some shortcomings.

This invention was made to eliminate the above-mentioned drawbacks, and in a DC motor that uses a permanent magnet as a pole (magnetic pole), overrunning occurs due to the frictional force of a cylindrical body made of a magnetic material that is in sliding contact with the pole. The purpose of this invention is to obtain a reliable starting motor by obtaining the protruding force of the clutch. This idea will be explained below.

FIG. 2 shows an embodiment of this invention. In this figure, the same reference numerals as in FIG. The spline is engaged with a helical spline (not shown) formed on the inner peripheral surface of the rear (left side in the figure) of the housing 11a. Reference numeral 12 denotes a cylindrical body having a flange 12a manufactured by pressing a mild steel plate member, and a pole 14 made of a permanent magnet such as ferrite fixed to the flange 12a and the inner peripheral surface of the yoke 13. It makes sliding contact with the end face. 15 is a coil spring that connects the cylindrical body 12 to the overrunning clutch 1.
The stepped portion disposed on the housing 11a of the housing 1 is pressed and biased to obtain the necessary frictional force. 16 is a retaining ring,
When the coil spring 15 receives the biasing force of the coil spring 15 and is deflected when the overrunning clutch 11 is protruded and reaches a full pressure (close contact) state, the flange 12a of the cylindrical body 12 and the pawl 14 come into sliding contact. is released. 17 is in contact with the end face of the pinion 4 and is connected to the overrunning clutch 1.
The necessary spring stress is set for the coil spring for returning the 1. 15 is the armature 9
The brush 19 comes into sliding contact with the commutator. 20 is a switch, and 21 is a battery.

Next, the operation will be explained.

When the switch 20 is closed, the battery 21 → switch 20 → brush 19 → armature 9 → brush 19
→ Ground → A closed circuit of the battery 21 is formed, the armature 9 is energized, and rotational force is generated by the magnetic biasing reaction force of the pole 14. At this time, leakage magnetic flux is generated due to the end face of the pole 14 coming into contact with the flange 12a of the cylindrical body 12, and the amount of magnetic flux of the external magnetic field is reduced. Rotate. Due to this rotation, the overrunning clutch 11 projects forward (to the right in the figure) on the helical spline 10a due to the frictional biasing force of the cylindrical body 12 and the inertial force due to the mass of the overrunning clutch 11. Due to this protrusion, the pinion 4 and the ring gear 8 mesh with each other, and the helical spline 1
The pinion 4 is moved to the stopper 7 by the screw action of 0a.
It is projected to a position where it touches the. At this time, if the coil spring 15 is set to be fully compressed, the sliding contact mechanism between the flange 12a of the cylindrical body 12 and the pole 14 is released, and the pole 1
The magnetic flux of 4 passes through the armature 9, the amount of magnetic flux increases, and the engine becomes in a high torque rotation state (not shown).
The ring gear 8 of is cranked. After the engine is started, the switch 20 is opened and the overrunning clutch 11 is opened with the same function as the conventional device shown in FIG.
returns to the state shown in FIG.

Furthermore, the sliding contact between the cylindrical body 12 and the pawl 14 is biased by the magnetic attraction force of the coil spring 17 and the pawl 14, and the overrunning clutch 11
When in the protruding state, the cylindrical body 12 and the pole 1
Until the release with 4 is performed, only the magnetic attraction force acts and the above-mentioned sliding contact is made. Further, this sliding contact force acts until the coil spring 15 is fully compressed, and the overrunning clutch 11
As the overrunning clutch 11 protrudes, the sliding force between the housing 11a and the cylindrical body 12 increases linearly, the frictional force increases, and the protruding force of the overrunning clutch 11 increases against the biasing force of the coil spring 17. It also has the effect of providing a prominent protruding function.

In the above description, the structure is based on a sliding mechanism between the cylindrical body 12 and the overrunning clutch 11, but a spline engagement or other engagement method may be used.

As explained above, this invention assists the protrusion of the overrunning clutch due to the screw action with the frictional force caused by the contact of the magnetic cylindrical body that slides against the end face of the pole made of a permanent magnet, and the overrunning clutch Since the above-mentioned sliding contact is released when the overrunning clutch is extended, the rotational speed of the overrunning clutch increases when the overrunning clutch is extended, and the torque during cranking is increased by controlling the field magnetic flux of the DC motor. Therefore, it has the advantage that the functions of the device, that is, the meshing and cranking functions between the pinion and the ring gear, can be achieved with a simple configuration and at low cost.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway side view showing an example of a conventional starter motor, and FIG. 2 is a partially cutaway side view showing an embodiment of this invention. In the figure, 4 is a pinion, 7 is a stopper, 8 is a ring gear, 9 is an armature, 10 is a rotating shaft, 11 is an overrunning clutch, 12 is a cylindrical body, 13 is a yoke, 14 is a pole, 15 is a coil spring,
16 is a retaining ring, 17 is a coil spring, 18 is a commutator, 19 is a brush, 20 is a switch, and 21 is a battery. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims for Utility Model Registration] (1) A starter motor equipped with a DC motor with a permanent magnet piece as a pole, which has a cylindrical body made of a magnetic material that slides into contact with the end face of the pole via a sliding mechanism. . A starter motor comprising an overrunning clutch that is in sliding contact with the cylindrical body via another sliding contact mechanism and is threadedly engaged with the output rotating shaft of the DC motor. (2) The starter motor according to claim 1, wherein the sliding contact mechanism between the cylindrical body and the overrunning clutch utilizes a spring biasing force. (3) The sliding contact mechanism between the pole and the cylindrical body is released by the protruding force of the overrunning clutch when the overrunning clutch is fully protruded.Scope of Utility Model Registration Claim (1) or a starting motor as described in paragraph (2).