JPH0633744B2 - Coaxial type starter device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a coaxial starter device, and more particularly to a coaxial starter device used for starting an engine of a vehicle.

(Prior Art) Conventionally, a starter device used for starting an engine of a vehicle has been constructed as shown in FIG.

A conventional starter device 1 shown in FIG. 2 includes a DC motor 2, an overrunning clutch device 4 slidably fitted on an output rotary shaft 3, and a rotation of an armature rotary shaft 2a of the DC motor 2. A gear unit 5 for decelerating the force and transmitting it to the clutch outer 4a of the overrunning clutch device 4 via the output rotary shaft 3, and a side portion of the DC motor 2 for sliding the overrunning clutch device 4 on the output rotary shaft 3. One end is engaged with the plunger rod of the electromagnet switch device 6 arranged at the other end and the other end is overrunning clutch device 4
The shift lever 8 is engaged with the annular member 7 attached to the.

(Problems to be Solved by the Invention) However, the conventional starter device 1 requires the shift lever 8 for sliding the overrunning clutch device 4 on the output rotary shaft 3, and further the shift lever 8
Since the electromagnet device 6 for activating the DC motor 2 and turning on the DC motor 2 has a so-called two-axis structure arranged on the side portion of the DC motor 2, there is a large restriction on the engine layout when the vehicle is designed.

In order to avoid such a problem, it has been proposed to arrange an electromagnet switch device at one end of the DC motor in the axial direction so that the starter device has a simple shape such as a simple elongated tubular body. According to this proposal, the armature rotary shaft of the DC motor is made hollow, and the plunger rod or other pushing rod of the electromagnet switch device that conventionally operates the shift lever is extended to the output rotary shaft through the internal passage of this armature rotary shaft. Such a starter device is called a coaxial starter device because the armature rotary shaft of the DC motor and the rod of the electromagnet switch device are arranged on the same axis.

However, when the coaxial shape is adopted as in the above-mentioned proposal, the whole shape becomes a simple elongated tubular body, but there is a problem that the whole length is inevitably lengthened.

An object of the present invention is to solve such a conventional problem, and to provide a small-sized coaxial starter device capable of improving the mountability to an engine by shortening the overall axial length. Especially.

(Means for Solving the Problems) In the coaxial starter device of the present invention, an electromagnet switch device provided on one end side in the axial direction of the electric motor includes a cylindrical exciting coil, and the exciting coil for the electric motor is provided inside the exciting coil. A movable contact for turning on the power source is arranged, and the movable coil is movable by being wrapped in a radial direction with the exciting coil.

(Operation) According to the coaxial starter device of the present invention, the movable contact for turning on the electric power of the electric motor is moved in the inner space of the exciting coil by the plunger of the electromagnet switch device and contacts the fixed contact. The electric motor is rotated by the contact between the movable contact and the fixed contact, and this rotational force is transmitted to the output rotary shaft through the overrunning clutch device.

(Embodiment) Hereinafter, the coaxial starter device of the present invention will be described in more detail with reference to a preferred embodiment shown in the accompanying drawings.

FIG. 1 shows a coaxial starter device 10 according to an embodiment of the present invention. The coaxial starter device 10 of the embodiment is a DC motor 1 having a tubular armature rotating shaft 11a.
1 is provided. An armature core 11b is press-fitted and fixed to the outer periphery of the tubular armature rotating shaft 11a. An output rotary shaft 12 is arranged on the same axis as the armature rotary shaft 11a at one axial end side (right side in FIG. 1) of the DC motor 11. One end of the output rotary shaft 12 is inserted into the internal passage 11c of the armature rotary shaft 11a and is supported slidably in the axial direction via a sleeve bearing 13 interposed between the output rotary shaft 12 and the inner peripheral surface thereof.

Transmission of the rotational force of the armature rotary shaft 11a to the output rotary shaft 12 is performed via a planetary gear device 14 and an overrunning clutch device 15. That is, the planetary gear device 14
Is a sun gear 14a integrally formed on the outer peripheral portion of one end of the armature rotating shaft 11a, and an internal gear 14 formed on the inner peripheral surface of the starter device machine frame 16 centered on the sun gear 14a.
b, the sun gear 14a and the internal gear 14b, and the clutch outer 15a of the overrunning clutch device 15.
It is composed of a plurality of planetary gears 14d rotatably carried by a central support shaft 14c fixed to. Further, the clutch inner 15b of the overrunning clutch device 15 meshes with the helical spline 12a formed on the outer peripheral surface of the output rotary shaft 12, whereby the output rotary shaft 1
2 can slide in the axial direction while receiving rotational power from the clutch inner 15b. Machine frame 16 of this output rotary shaft 12
A pinion 17 that meshes with the ring gear of the engine is fixed to the protruding end of the pinion.

On the other hand, an electromagnet switch device 18 is provided on the other end side (left side in FIG. 1) of the DC motor 11. The electromagnet switch device 18 has a cylindrical exciting coil 19, and the exciting coil 19 has a central axis line in the DC motor 1.
The armature rotary shaft 11a is arranged so as to substantially coincide with the central axis of the armature rotary shaft 11a. A fixed iron core 20 is arranged on the end surface of the exciting coil 19 on the DC motor 11 side, and the fixed iron core 20 is fitted into the internal space 21 of the exciting coil 19 so as to slightly project therefrom. On the rear end side (on the side opposite to the DC motor) in this internal space 21, a cylindrical plunger 22 is axially movably fitted so as to face the fixed iron core 20, and the plunger 22 and the fixed iron core. A return coil spring 23 made of a stainless steel material is arranged in a contracted manner between the coil spring 23 and 20.

An operating rod 24 is arranged on the central axis of the electromagnet switching device 18, in other words, at the central axial position of the exciting coil 19, and the rear end of the operating rod 24 is fixedly connected to the radial support plate 22a of the plunger 22. There is. Actuation rod 2
The front end of 4 is inserted into the armature rotating shaft 11 of the DC motor 11a from the other end. A pushing rod 25 is arranged in the hollow shaft of the armature rotating shaft 11, and its front end is in contact with the inner wall of a hole 12b formed in the end face of the output rotating shaft 12 via a steel ball 26. Also, push rod 25
On the outer peripheral portion near the rear end, a protrusion 25 protruding outward in the radial direction is formed.
A is formed, and a coil spring 27 is arranged between the protrusion 25a and the front end surface of the operating rod 24.

A cylinder 28 is fitted to the outer peripheral portion of the front end of the operating rod 24, and one end of the cylinder 28 extends from the front end of the operating rod 24 to the pushing rod 25 side and encloses the coil spring 27. The inner peripheral portion of the other end of the cylindrical body 28 is formed as a thick portion 28a, and is engaged with a thick portion 24a formed at the outer peripheral portion of the front end of the actuating rod 24 so as not to come off. Actuation rod 2
4, a spring receiving protrusion 24b is formed on the outer peripheral surface of the intermediate portion of 4,
A coil spring 29 is arranged between the spring receiving projection 24b and the end of the cylindrical body 28 so as to surround the operating rod 24.

A pipe-shaped support body 30 is fixed to the outer peripheral portion of the actuation rod 24 on the rear end side of the spring receiving projection 24b.
A movable contact 31 is slidably fitted and mounted on the outer periphery of 0. The movable contact 31 is constantly pressed toward the front stepped portion by a spring 32 arranged between the movable contact 31 and the support plate 22a of the plunger 22 fixed to the operation rod 24 at the rear end of the support 30.

On the rear end side of the DC motor 11, a resin bracket 33 that holds a brush 11e that slidably contacts the commutator 11d is provided between the magnet switch device 18 and the electromagnet switching device 18, and a fixed contact 34 is provided inside the exciting coil 19 in the bracket 33. Void 2
It is supported so as to project into 1. This fixed contact 3
4 is at a position where it abuts on a movable contact 31 which is moved axially along with the so-called operating rod 24 by the movement of the plunger 22, and therefore this movable contact 31 is the axial length in the internal space 21 of the exciting coil 19. It will be moved within the range of.

Next, the operation of the starter device 10 according to the above embodiment will be described.

When the starter switch of the vehicle is closed, the exciting coil 19 of the electromagnet switching device 18 is energized, and the electromagnetic force generated by this excitation moves the plunger 22 axially rightward as viewed in FIG. As a result, the operating rod 24 pushes out the output rotary shaft 12 via the coil springs 27, 29 and the push rod 25, and the pinion 17 provided at the end of the output rotary shaft 12 meshes with the ring gear of the engine. At the same time, along with the movement of the actuating rod 24, the movable contact 31 also moves axially rightward together with the support body 30,
The pinion 17 at the tip of the output rotary shaft 12 contacts the fixed contact 34 immediately before meshing with the ring gear of the engine. As a result, the DC motor 11 is powered on, and as a result, the rotational force of the armature rotary shaft 11a is decelerated by the planetary gear device 14 and transmitted to the clutch outer 15a of the overrunning clutch device 15 to rotate the clutch outer 15a. Is transmitted to the clutch inner 15b via the cylindrical roller 15c. The rotation of the clutch inner 15b is transmitted to the output rotary shaft 12 by the helical spline 12a, thereby rotating the pinion 17 and starting the engine.

After the engine is started, the reverse drive is blocked by the overrunning clutch device 15 and the energization of the exciting coil 19 in the electromagnet switching device 18 is cut off, so that the actuating rod 24 together with the plunger 22 has the return spring 23, the coil spring 27, It is returned to the original position by 29.

As described above, when the movable contact 31 is arranged in the inner space of the exciting coil so as to be movable and the return spring 23 is present close to the fixed contact, the movable contact 3
The heat generated by the arc generated when the contact point 1 and the fixed contact 34 are contacted and separated is applied to the return spring 23. As described above, since the return spring 23 is made of stainless steel, the heat generated by the arc causes It will not be adversely affected.

(Effects of the Invention) As described above, according to the coaxial starter device of the present invention, the movable contact of the electromagnet switch device is arranged in the internal passage of the exciting coil, and moves within the length range of the passage. By making contact with the fixed contact, the axial length of the electromagnet switch device can be shortened by the moving distance of the movable contact, and as a result, the overall length of the starter device is shortened and the mountability to the engine is reduced. An improved compact coaxial starter device can be provided.

[Brief description of drawings]

FIG. 1 is a sectional view showing a coaxial type starter device according to an embodiment of the present invention with its upper half broken, and FIG. 2 is a sectional view showing a conventional biaxial type starter device. 10 ... coaxial starter device, 11 ... DC motor, 1
1a ... Armature rotating shaft, 12 ... Output rotating shaft, 15 ...
Overrunning clutch device, 18 ... Electromagnetic switch device, 19 ... Excitation coil, 21 ... Internal void, 22
...... Plunger, 23 ...... Return spring, 24 ...... Actuation rod, 31 ...... Movable contact. The same reference numerals in the drawings indicate the same or corresponding portions.

Claims (3)

[Claims] 1. An electric motor having a tubular armature rotating shaft, and an output rotation disposed axially on one end side of the electric motor with respect to the armature rotating shaft and slidably supported in the axial direction. A shaft, an overrunning clutch device for transmitting the rotational force of the armature rotary shaft to the output rotary shaft, and an electromagnet switch device provided on the other axial end of the electric motor, the electromagnet switch device being a cylinder -Shaped exciting coil, a cylindrical plunger slidable in the axial direction inside the exciting coil, a rod that is moved in the axial direction by the plunger and applies an axial moving force to the output rotary shaft, inside the plunger The movable contact is provided and is movable in the axial direction within the length range of the exciting coil by a plunger, and the movable contact excites the fixed contact that is in contact with the movable contact. Coaxial starter apparatus characterized by being contactable to said fixed contacts and moved inside the file. 2. The return coil according to claim 1, wherein a return spring for returning the plunger to its original position when the energization of the exciting coil is cut off is provided inside the exciting coil. Coaxial type starter device. 3. The coaxial starter device according to claim 2, wherein the return spring is made of a stainless material.