KR910001818Y1 - Face commutator type starter - Google Patents

Abstract

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Description

Face Commutator Starter

1 is a cross-sectional view of a face commutator starter according to an embodiment of the present invention.

2 is a cross-sectional view showing another embodiment of this face commutator.

3 is a cross-sectional view of a conventional face commutator starter.

* Explanation of cold symbols in the main part of the drawings

1: armature 2: armature rotating shaft

3: face commutator 4: brush

6: brush spring 31: output shaft

38: permanent magnet 38a: main stimulation

38b: auxiliary pole

The present invention relates to, for example, a face commutator starter used for a light of a vehicle engine.

Conventionally, there have been some types of face commutator starters shown in FIG. 3, for example. In the drawing, reference numeral 1 denotes an armature of a DC motor, 2 denotes an armature rotating shaft, and a face commutator 3 is fitted to the rear of the armature, and the face commutator 3 is an armature coil. (4a) is a brush, it is arrange | positioned in the back bracket 5 made of resin, and is pressed by the brush spring 6 to the face commutator 3 surface. (7) is a bearing for supporting the armature rotating shaft (2), and is fixed to the rear bracket (5). 8 is a fixed contact of the electromagnetic switch 9, and is attached to the rear bracket 5 by a nut 10. As shown in FIG.

In addition, 1 l is a movable contact of the electronic switch 9. It is attached to the plunger rod 13 via the insulator 12. Reference numeral 14 denotes a core, and 15 denotes an excitation coil that exerts a force on the plunger 16 and is fixed to the case 18 by being wound on a resin-formed bobbin 17. In addition, a hollow portion 19 is formed inside the plunger 16, and a force is applied to the rod 21 in the forward direction by the spring 20.

Reference numeral 22 denotes a yoke of a DC motor, and 23 denotes a permanent magnet disposed on the inner circumferential surface of the yoke 22 to generate an electric motor, and a planetary gear reduction device on the rear inner circumference of the yoke 22 end. The front bracket 25 in which the internal gear 24 which comprises this is formed is being fixed. Reference numeral 26 denotes a spur gear formed at the front end of the armature rotating shaft 2 as a sun gear of the planetary gear reduction apparatus, and the planetary gear 27 is engaged. Reference numeral 28 denotes a bearing fitted to the inner circumferential surface of the planetary gear 27 and is supported by a support pin 37 fixed to the concave portion of the overrunning clutch 29.

The overrunning clutch 29 is composed of an overrunning outer 29a, an overrunning inner 29b and rollers 29c disposed therebetween, and an overrunning portion of the overrunning inner 29b and the front bracket 25. Between the 25a, the bearing 30 which supports a radial load is provided. 31 is an output rotary shaft, and the operation of the plunger 16 is transmitted through the rod 21 and the steel ball 32. In addition, the output rotation shaft 31 is splined to be slidably moved back and forth in a helical spline formed on the inner surface of the overrunning inner 29b.

Further, reference numeral 33 denotes a sleeve bearing for supporting the rear end of the output recovery shaft 31, and 34 denotes a bearing for supporting the armature rotating shaft 2, and is fitted to the inner surface of the end of the yoke 22. Reference numeral 35 denotes a pinion, which is fitted to a straight spline 31a formed on the outer circumference of the output rotation shaft 31 and held forward by the stopper 36.

Next, the operation of the starter of the above configuration will be described. By closing the key switch (not shown), it energizes the exciting coil 15 of the electronic switch 9, and a force is applied to the plunger 16 to move forward. As a result, the movable contact 11 abuts on the fixed contact 8 and is connected to the brush 4 connected to the lead wire (not shown) at the fixed contact 8, thereby allowing the armature coil 1a to pass through the face commutator 3. ), The armature 1 generates a rotational force.

On the other hand, the driving force of the plunger 16 to which the force is applied is transmitted to the output rotation shaft 31 through the rod 21 so that the output rotation shaft 31 moves forward, and the pinion fitted to the output rotation shaft 31. Reference numeral 35 is engaged with a ring gear of an engine (not shown) to start the engine.

The conventional face commutator type starter is configured as described above, and the face commutator 3 is always pressed forward by the brush 4 to which the force is applied by the brush spring 6. For this reason, the armature rotating shaft 2 also always receives a force in the forward direction, and there is a problem that a torque loss occurs in the thrust bearing portion.

The present invention has been made to solve the conventional problems as described above, and an object thereof is to obtain a waste-ice commutator type starter capable of reducing tocorose in the axial direction.

The face commutator starter according to the present invention is the surface of the magnetic center of the field of the electric motor in the direction opposite to the brush pressing direction at the axial center of the armature.

In the present invention, since the magnetic center of the field is biased, when the armature is energized and rotated, the force in the direction of the field of the center of the field is regenerated. For this reason, the pressing force to the face commutator by a brush cancels and the thrust load of an armature rotating shaft reduces.

1 is a cross-sectional view of a face commutator starter according to an embodiment of the present invention. (1)-(37) in FIG. 1 are the same as the starter of the bell shown in FIG. 3, the same code | symbol is attached | subjected to the corresponding part, and the description is abbreviate | omitted. Further, reference numeral 38 denotes a permanent magnet which is fixed to the inner circumferential surface of the yoke 22 to generate a field, and is disposed so that its magnetic center in the axial direction is located toward the brush 4 at the axial center of the armature 1.

In the face commutator type starter configured as described above, the output rotating shaft 31 moves forward while the armature 1 rotates as a result of the energization of the electronic switch 9, and the pinion 35 is engaged with the ring gear so that the engine Is started. And since the magnetic center of the permanent magnet 38 is biased toward the brush 4, the armature 1 and the armature rotating shaft 2 are always sucked backward during the rotation of the armature 1. For this reason, it is canceled by the suction force to the back of the pressing force to the front direction by the brace spring 6. The thrust load on the thrust bearing is reduced.

2 is a report pole 38b which is a section in which a field is fixed adjacent to a main magnetic pole 38a made of permanent magnets and the armature half-rotation direction side of the main magnetic pole 38a. Another embodiment constituted by) is shown. That is, in this embodiment, the magnetic core of the main magnetic pole 38a coincides with the axial center of the armature 1, and only the magnetic center of the auxiliary pole 38b is biased toward the brush 4.

In such a configuration, when the load is large, the current flowing through the armature coil 1a is large, and thus the magnetic flux is large, and a force for sucking the armature 1 toward the brush 4 is generated. For this reason, the pressing force of the brush spring 6 is canceled, the thrust load to the front direction is reduced, and torque loss can be reduced. Also. When the load is small, the magnetic flux of the field is small because the current to the armature coil 1a is small. Therefore, since the suction force to the rear by the auxiliary electrode 38b is small and the striking load in the forward direction is relatively large, the brake action can be obtained and the over-rotation at light load can be prevented. can do.

In other words, the rotational loss is reduced at heavy loads. At light loads, over-rotation can be prevented by the brake action by the three loads.

In the above embodiment, the crab is constituted by using a permanent magnet, but the present invention is not limited thereto, and even if the field coil is wound around the field core, the same effect as in the above embodiment can be obtained.

As described above, according to the present invention, since the magnetic center of the field of the electric motor in the face commutator starter is biased toward the opposite direction to the direction in which the brush presses, the thrust load during armature rotation is reduced. There is an effect that can reduce the torque loss at the start angle.

Claims (4)

In a face commutator starter in which a commutator of an electric motor is formed in a direction substantially perpendicular to an axial direction of an armature rotating shaft, and the commutator is pressed by a brush in the axial direction of the armature rotating shaft, the field of the electric motor. A face commutator starter, characterized in that the magnetic center is biased in a direction opposite to the pressing direction of the brush from the axial center of the armature. The method of claim 1. Face commutator starter, characterized in that the field is rugged magnet. The face commutator starter according to claim 1, wherein the field is wound around field coils. The face commutator type according to claim 1 or 2, wherein the field is composed of a main pole and an auxiliary pole, and the center of the pole of the auxiliary pole is biased in a direction opposite to the pressing direction of the brush at the center of the armature axis. Starter.