JPS60104768A - Inertia rush type starting motor - Google Patents

Abstract

PURPOSE:To prevent a pinion from its early return with certainty, by setting up a solenoid brake in opposition to the outer circumference of a clutch outer through some play, while making a friction brake body so as to be inserted into the clutch outer and an armature in time of engagement between the pinion and a ring gear. CONSTITUTION:When a switch is turned on for starting an engine and an armature 1 and an exciting coil 20 both are energized, a iron core 19 is magnetized whereby a movable iron core part 15 is attracted toward an armature shaft 2, and a brake part 16 being solidified with the movable iron core part 15 is forcibly pressed to a clutch outer 7. In addition, with rotation in the armature shaft 2, a pinion 9 is advanced as being rotated by means of helical spline coupling via a spline tube 4, the clutch outer 7, a roller 8 and so on. And, with pressure- contact of the brake part 16 onto an outer circumference of the outer 7, the pinion 9 is gently rotated and smoothly engaged with a ring gear 11. In time of this engagement, the brake part 16 is inserted into the rear of the outer 7 whereby a return of the pinion 9 is checked in consequence.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an inertia plunge starter motor used for starting an engine.

[Prior art]

The conventional method is as shown in Japanese Patent Application Laid-Open No. 50-311,
There is one in which the field of the motor is extended and placed so as to face a retaining plate attached to the pinion, and when the pinion is protruded, electromagnetic force using part of the magnetic flux of the motor is used to prevent the pinion from returning.

However, in the above-mentioned conventional type, the magnetic force is weak because part of the magnetic flux of the motor is used, and the return direction of the binion and the direction in which the holding plate leaves the L-shaped part of the commutative pole are the same direction, so the binion does not move away from the ring gear. When I tried to return,
There are disadvantages in that the retaining plate is easy to separate, and another shock absorbing mechanism is required to reduce the impact when meshing with the pinion and the ring gear and improve the meshing performance.

[Purpose of the invention]

In order to solve the above-mentioned drawbacks, the present invention arranges an electromagnetic brake to face the outer periphery of the clutch outer with a gap therebetween, thereby softening the collision when meshing with the ring gear and improving the meshing performance. When the binion engages with the ring gear, a friction brake body is inserted between the clutch outer and the armature, and if the binion is pushed back from the ring gear due to engine rotational fluctuations,
The objective is to ensure that the pinion is prevented from returning prematurely because it comes into contact with the clutch outer end face, and that the magnetomotive force generated in the excitation coil only needs to drive the friction brake body, so less magnetomotive force is required, and the magnetomotive force can be made smaller. .

〔Example〕

The present invention will be described below with reference to embodiments shown in the drawings.

In FIGS. 1 and 2, the armature l and armature shaft 2 of the inertia plunge-starting motor are fixed together, and a helical spline 3 is provided around the armature shaft 2. A helical spline is provided on the inner diameter of the spline tube 4, and the outer periphery of the helical spline 3 is screwed together, and the clutch outer 7 is connected to the spline tube 4 through the serrations 6 provided on the outer periphery of the spline tube 4. Mounted so that it can move in the axial direction fJ
It is being A clutch inner 9a is connected to the inner side of the clutch outer 7 via a rotor 8, and the clutch inner 9a and the pinion 9 are integrally formed. A drive spring 5 is attached to the outer periphery of the spline tube 4 and between it and the clutch outer 7. The stop ring 12 determines the forward position of the pinion 9, and a return spring 10 is installed between the stop ring 12 and the pinion 9. A coil spring 14 is provided on the outer periphery of the clutch outer 7 inside a holder 13 that is fixed to the inside of the housing 17 with a screw 18. The coil spring 14 supports a friction brake body in which the movable iron core part 15 and the brake part 16 are integrated within the boulder 13.

The brake portion 16 is preferably made of a non-magnetic material, and is suitable for use with less wear. The friction brake body is movable in the radial direction of the armature shaft 2, and faces the outer periphery of the clutch outer 7 provided on the armature shaft 2 through a gap when not driven, and faces the pinion 9 when driven. When the ring gear 11 is engaged, a friction brake body is disposed between the clutch outer 7 and the armature 1. Further, four friction brake bodies are arranged evenly in the outer circumferential direction of the clutch outer 7, and an arc-shaped iron core 19 is provided between each friction brake body. This iron core 19 is fitted into a holder 13 that supports each friction brake body. An excitation coil 20 is wound around the outer periphery of the iron core 19.

Next, the operation of the above configuration will be explained. When the key switch is placed in the starting position when starting the engine and current flows through the armature 1 and the exciting coil 20, the iron core 19 is magnetized.
In order to attract the i1J moving iron core part 15 in the direction of the armature shaft 2, the outer periphery of the clutch outer 7 is pressed by the brake part 16 which is integrated with the moving iron core part 15. On the other hand, due to the rotation of the armature shaft 2, the spline tube 4, which is threadedly engaged with the outer periphery of the helical spline 3 provided on the 011 armature shaft 2, moves forward while rotating due to the action of the helical spline. , the pinion 9 is rotated and advanced through the rollers 8 and the clutch inner 9a, but since the outer periphery of the clutch outer 7 is pressed by the brake part 16 of the friction brake body, the pinion 9 is rotated slowly and moved forward. Advance. In addition, since the pinion 9 moves forward while rotating slowly, the collision when meshing with the ring gear 11 is also gentle, and the meshing performance is also good.

However, if the pinion 9 and the ring gear 11 do not mesh with each other, only the spline tube 4 moves forward due to the serrations 6, and the drive spring 5 is deflected.

During this time, the pinion 9 rotates a little, and when the pinion 9 and the ring gear 11 come to a position where they can engage with each other, the forward force of the spline tube 4 and the spring pressure of the drive spring 5 cause the pinion 9 to rotate. gear 1
It meshes with 1. In this state, a friction brake body is located between the clutch outer 7 and the armature 1, and the friction brake body is positioned closer to the armature shaft 2 than the outer periphery of the clutch outer 7 due to the electromagnetic attraction force of the excitation coil 20. Someone gave me an F. Therefore, even if the pinion 9 is attempted to be returned to the rear by the rotational force from the ring gear 11 due to rotational fluctuations when the engine is started, the end surface of the friction brake body
The pinion 9 is prevented from returning by receiving the end face of the pinion 9. When the pinion 9 hits the stop ring 12, there is a slight distance between the end face of the tarante out tuff and the end face of the friction brake body, so the pinion 9 transfers the rotational force of the armature I to the friction brake body. The signal is transmitted to the ring gear 11 and the engine is started without being stolen.

After the engine has started, the current in the excitation coil 20 is cut off by returning the key switch from the starting position to the running position, and the friction brake body is connected to the coil spring 1.
4, it is returned to its original position and is no longer in contact with the outer periphery of the clutch outer 7. In addition, as the armature current is also cut off, the rotational force of the Tri armature 1 is lost, and the rotational speed of the armature shaft 2 and spline tube 4 is slowed down. The spring 10 returns the pinion 9, clutch outer 7, and spline tube 4 to their original positions.

In addition, in the above-mentioned embodiment, there are four friction brake bodies.
Although it is provided in one place, it goes without saying that it is sufficient to provide it in more than one place. In addition, as in another embodiment shown in FIG. It may be fixed. In this embodiment, the friction brake body is supported by a coil spring 14 provided inside the bobbin 23, and a stationary core 21 is provided on the iron plate 22 in accordance with the shape of the movable iron core 15.

〔Effect of the invention〕

As described above, in the present invention, a holder is fixed in a housing, a movable iron core part and a brake part are integrally provided inside the holder so as to be movable in the radial direction of the armature shaft. A friction brake body that has become a Equipped with an excitation coil that generates magnetic force, the friction brake body faces the outer periphery of the clutch outer provided on the armature shaft through a gap when not in operation, and the binion and ring gear mesh when in operation. Sometimes, because a friction brake body is placed between the clutch outer and the armature, when a current is applied to the excitation coil when starting the engine, the movable iron core is attracted to the armature shaft side by the field of the iron core, and the movable iron core is Since the brake part attached to the clutch presses the outer periphery of the clutch outer, the rotation of the armature shaft gently rotates the rotating and advancing pinion, which reduces collisions when meshing with the ring gear and improves meshing performance. At the same time, when the pinion meshes with the ring gear, the friction brake body is located between the clutch outer and the armature, and is attracted toward the armature shaft by the magnetomotive force of the excitation coil than the outer periphery of the clutch outer. Even if the pinion is pushed back from the ring gear due to engine rotational fluctuations, the end face of the clutch outer is received by the end face of the friction brake body, ensuring that the pinion is prevented from returning early, and the magnetomotive force generated in the excitation coil is reduced by friction. Since only the brake body needs to be attracted below the outer periphery of the clutch outer, less magnetomotive force is required, and it has the advantage of being compact and can be installed on conventional products with almost no modification.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing an embodiment of the main part of the inertia jump type starter motor of the present invention, FIG. 2 is a cross-sectional view taken along the line A-A shown in FIG. 1, and FIG. FIG. 7 is a longitudinal sectional view showing another embodiment of the main part of the starter motor. ■... Armature, 2... Armature shaft, 7... Clutch outer, 13... Holder, 14... Coil spring, 15... Movable iron core part, 16... Brake part, 1
7... Housing, 19... Iron core, 20... Excitation cosel. Representative Patent Attorney Takashi Okabe Figure 1〒〒Bar-1 Figure 2N Figure 3 1

Claims (1)

[Claims] In an inertial jump-start motor in which a thalassocia shaft and a pinion move forward while rotating due to the rotation of an armature shaft, a holder is fixed in a housing, and a holder is provided inside the holder so as to be movable in a radial direction of the armature shaft. a friction brake body in which a movable iron core part and a brake part are integrated; a coil spring provided inside the holder and giving a force to return the friction brake body in one circumferential direction; and an excitation coil that generates a magnetomotive force for attracting the movable iron core toward the armature shaft, and the friction brake body is mounted on the armature shaft when not driven. When the pinion and the ring gear are opposed to the outer periphery of the crunch auger through a gap, and are engaged with each other during driving,
An inertia jump type starter motor, wherein the friction brake body is disposed between the clutch outer and the armature.