JPH0196468A - Coaxial type starter device - Google Patents

Abstract

PURPOSE:To prevent the rotary shaft of an armature and the output rotary shaft from wear by making the rotary shaft of armature of a motor tubular and interposing a bearing between the front end face of rotary shaft of armature and the rear end face of expanded diameter portion of the output rotary shaft. CONSTITUTION:A rotary shaft 26 of armature of a motor 25 is made tubular. A bearing 32 is interposed between the front end face of said rotary shaft 26 of armature and the rear end face of expanded diameter portion 28b of an output rotary shaft 28. An electromagnet switch 34 is disposed at the rear end side of motor 25 to slide the output rotary shaft 28 as soon as current is supplied to the motor 25. Thus, since the rotary shaft of armature can be avoided from abutting directly against the output rotary shaft, both shafts can be prevented from wear due to the abutting against each other by the rotational difference between both shafts.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Application in M Business) The present invention relates to a coaxial starter device, and more particularly to a coaxial starter device used for starting a vehicle engine.

(Prior Art) Conventionally, a starter device used for starting a vehicle engine has a so-called 2) M system in which an electromagnetic switch device for turning on power to a DC motor is placed on the side of the DC motor.
It had 11 configurations. However, such a two-shaft starter device imposes major restrictions on the engine layout when designing a vehicle, so the electromagnetic switch device is placed at one end in the axial direction of the DC motor, and the starter device is simply shaped like an elongated cylinder. It was proposed to create a simple shape similar to a body.

According to this proposal, as shown in FIG. 4, the armature rotating shaft 2 of the DC motor 1 is made into a center 9, and the plunger rod 4 or other push rod of the electromagnetic switch device 3, which is conventionally operated by fully operating the shift lever, is used. The basic configuration is that the output rotating shaft 51 extends through the internal passage 2a of the armature rotating shaft 2, and the rod 4 of the t machine/pre-excitation shaft 2 of the DC motor l and the electromagnetic switch device 3. This type of starter device is called a coaxial starter device because the output rotating shaft 5 and the output rotating shaft 5 are arranged on the same line of flow.

To further explain the specific Ll of such a coaxial starter device, the front end side (toward the right in Fig. 4) with an output rotation of 1 kB5 is equipped with a binion 6 that is engaged with the ring gear of @Seki. The core 9j is inserted into the internal passage 2a of the armature rotating shaft 2, and the insertion shaft 5a is supported by a sleeve bearing 7 which is fixedly fixed to the inner circumference of the internal passage 2a, and the core 9j is supported in the axial direction of the output rotating shaft 5. This allows for sliding movement. A driving force transmission device 9 including an overrunning clutch device (one-way clutch device) 8 serves as a means for transmitting the driving force from the armature rotation @2 of the blood flow motor 1 to the output rotating shaft 5 sliding in the fa+ direction. It is made up of.

That is, this driving force transmission device f9 includes a planetary gear reduction device 10 that includes a sun gear 10a and a planetary gear 10b formed around the front end of the armature rotating shaft 2, and a planetary gear reduction device 10 that is formed around the front end of the armature rotating shaft 2.
1ob center support shaft 1] is attached to the clutch outer 8
The clutch device 8 is comprised of the above-mentioned axial clutch device 8, which is provided with a clutch inner 8b that is fitted with a helical stripe 5ciC formed on the outer periphery of an enlarged diameter portion 5b formed on the output rotating shaft 5.

(Problems to be Solved by the Invention) However, in the coaxial starter device proposed as described above, the output rotating shaft 5 that has been slid forward by the plant gear rod 4 of the electromagnetic switch device 3 returns to its original position. An enlarged diameter portion 5b of the output rotating shaft 5 is provided on the front end surface of the DC motor 1.
The rear end surfaces will come into direct contact with each other. This coaxial starter device transmits 50 rotations of the output rotating shaft to the engine ring gear (not shown) via the pinion 6, so the output rotating shaft 5 is reversely driven by the engine until the pinion 6 comes off the ring gear when starting the engine. and rotates at high speed. However, such high-speed rotation of the output rotating shaft 5 received from the engine requires an axial clutch device 8 to protect the DC motor.
The subsequent reverse transmission is cut off, and the armature rotation shaft 2V
As a result, there is a large rotational difference between the armature rotating shaft 2 and the output rotating shaft 5, which rotates at high speed due to inertia, which may cause severe wear at the above-mentioned contact points. Ta.

The object of the present invention has been made to solve such problems, and is to completely prevent wear on the front end face of the armature rotating shaft and the rear end face of the enlarged diameter part of the output rotating shaft, thereby achieving durability and high reliability. An object of the present invention is to provide a coaxial starter device.

(Means for Solving the Problems) The coaxial starter device of the present invention includes an electric motor having a tubular armature rotating shaft, and a pinion arranged at the front end side of the electric motor and having a pinion connected to and disengaged from the ring gear of the engine at one end. axial direction V? with the other end inserted into the internal passage of the armature rotating shaft.
- a slidable output rotation shaft, a driving force transmission device having an overrunning clutch device and transmitting rotation of the armature rotation shaft to the output rotation shaft via the overrunning clutch, and the armature rotation shaft a bearing disposed between a surface of the armature rotating shaft perpendicular to the axis at or near the front end of the armature and an end surface of an enlarged diameter portion formed on the output rotation shaft;
The motor is configured to include an electromagnetic switch device disposed on the rear end side of the electric motor for energizing the electric motor and sliding the output rotating shaft at the same time.

(According to the coaxial starter device of the present invention, the electromagnetic switch device is energized to move the output rotating shaft, and at the same time as the binion meshes with the engine ring gear, the electric motor VC power is turned on. This causes the armature in the electric motor to rotate. The rotational force of the shaft is transmitted to the pinion via the axial clutch device,
& Seki is driven.

When the engine starts, the electromagnetic switch device is de-energized, thereby returning the output shaft to its original position. At this time, the end surface of the enlarged diameter portion of the output rotating shaft comes into contact with the end surface of the armature rotating shaft via the bearing. When the electromagnetic switch device is de-energized, the electric motor is also de-energized, and the pinion and engine ring gear are disengaged from each other due to the return of the output rotating shaft.

(Embodiment) The coaxial starter device of the present invention will now be described in more detail with reference to preferred embodiments shown in the accompanying drawings.

FIG. 1 shows a coaxial starter device 20 according to an embodiment of the present invention. The coaxial starter device 20 of this embodiment includes permanent magnets 22 which are fixed at intervals in the circumferential direction on the inner circumferential surface of a yoke 2)a that constitutes a magnetic path and constitutes an outer wall, and a yoke 2). ) includes an electric motor 25 which is formed into a shape of an armature 23 rotatably disposed at the center of the armature 23 and a conventional commutator 24 provided at one end of the armature 23;

The armature 23 in this DC motor 25 has a t#IG configuration including a hollow armature rotating shaft 26 and an armature core 27 attached to the outer periphery of the rotating shaft. An output rotation shaft 28 is disposed on one axial end side, that is, the front side (right side in FIG. 1) GC of the DC motor 25, and rotation is transmitted by a driving force transmission device 29. This driving force transmission device 29 is composed of a planetary gear device 30, a one-way clutch device (overrunning clutch device) 31, and a helical spline 28a formed on the output rotating shaft 28 and meshing with a clutch inner 31a of the axial clutch device 31. There is.

Output minister 1 turn 1jl128 is DC 1! It is arranged on the same axis as the armature rotating shaft 26 of the tJrtI machine 25, and one end thereof is fully inserted into the internal passage 26a of the armature rotating shaft 26, and the shaft is inserted through the bearing 32 that is interposed between the inner circumferential surface of the internal passage 26a. It is supported slidably in the direction VC.

The rotational force of the armature rotating shaft 26 is transmitted to the output rotating wheel 28 via a planetary gear reduction gear 1ft30 and an axial clutch device 31. That is, the planetary gear reduction device 3
0 is armature rotation! A sun gear 30a integrally formed on the outer periphery of one end of the 11126, an internal tooth 'JJL30b formed on the inner peripheral surface of the yoke 2)a of the electric motor around the sun gear 30a, and a sun tooth m 3 (l a and a plurality of planetary teeth jtL30d supported by a center support @30c which meshes with the internal gear 30b and is fixed to the clutch outer 31b of the axial clutch device 31. The clutch inch 31a of the clutch device 31 is connected to the radially outward protruding portion 2 of the output (b) rotating shaft 28.
Since the output rotating shaft 28 is fitted with the helical spline 28a formed on the outer peripheral surface of the clutch inner 31a, the output rotating shaft 28 is slid in the axial direction while receiving the rotational force from the clutch inner 31a.
A pinion 33 attached to the front end of the output rotating shaft 28 protrudes from the front bracket 2)b by sliding of the output rotating shaft 28, meshes with a ring gear (not shown) of the engine, and rotates it.

On the other hand, the output rotating shaft 28 is slid on the rear side of the rear bracket 2)c which is fitted and attached to the rear end of the DC motor 25, and when the key switch (not shown) of the machine is closed, the DC current from the battery is supplied. An electromagnetic switch device 34 is arranged that allows power to be supplied to the electric motor 25. This electromagnetic switch device 34 has an excitation coil 37 wound around a plastic bobbin supported by front and rear cores 36a and 36b that constitute a magnetic path together with a case 35, and is slidable in the central opening of the bobbin. a tubular rod 39 made of non-magnetic stainless steel whose one end is attached to the plantar 38 and whose other end enters the internal passage 26a from the rear end of the armature rotating shaft 26; It is held through an upper VC insulator 40 and includes a movable contact 41. A push rod 42 is slidably fitted into the tubular rod 39, extends forward from the front end opening of the tubular rod 39, and has a front end formed on the end surface of the output rotation shaft 28. The steel ball 43 is in contact with the inner wall of the recessed portion. Note that 44 indicates a coil spring disposed inside the tubular rod 39 to apply a pressing force to the push rod 42, and 45 indicates a coil spring disposed around the push rod 42 for returning the tubular rod 39. .

By the way, the output rotating shaft 28 is slidably supported with respect to the armature rotating shaft 26 (inner passage 2 of the armature rotating shaft 26).
A bearing 32, such as a sleeve bearing, which is fitted into and fixed to the inner circumferential portion of 6a is a cylindrical bearing portion 3 that receives the radial load of the output rotating shaft 28, as shown in FIG.
2a, and is interposed between the front end face of the armature (ro) rotation @26 that extends radially outward at the front end edge of this cylindrical bearing part 32a and the end face of the enlarged diameter part of the output rotating shaft, and the output rotating shaft Expanded diameter part 2
It is composed of seven lance-shaped bearing portions 32b that receive the thrust load N through the bearing portion 8b. In this bearing 32, the rear end of the cylindrical bearing portion 32a does not extend to the position where the armature rotation shaft 26 of the armature 23 is attached to the armature core 27, but terminates just before that position. This means that if the bearing is extended at position 1 for armature core installation, the shaft section will be distorted when forming a knurl roll in the center of the T-shaped rotating shaft 26 for armature core installation. This causes problems such as a reduction in the pressure-receiving area of the bearing or difficulty in press-fitting the bearing.

Next, the operation of the starter device 10 described above will be briefly explained.

When the starter switch of the vehicle is closed, the electromagnetic switch device 34 is energized and the tourn soya 38 moves forward, and the accompanying movement of the tubular rod 39 compresses the internal coil spring 44, causing the push rod 42Vc to move forward.
Once the pressing force is applied, the output rotating shaft 28 is slid forward. As a result, the pinion 33 is engaged with the ring gear of the engine, and the movable contact 41 provided on the tubular rod 39 comes into contact with the identification contact 46, thereby turning on the power to the DC motor 25. As a result, the rotational force of the armature rotating shaft 26 of the DC motor 25 is transmitted to the output rotating shaft 28 via the planetary gear reduction device 30, the axial clutch device 31, etc., and the engine is driven by the rotation of the pinion 33.

When the engine is started, the power to the electromagnetic switch device 34 is cut off, the output rotation wI28 is returned to its original position by a return spring provided at an appropriate position, and the engagement between the binion and the engine ring gear is released.

However, during a short period of time after the engine is started until the engagement between the pinion and the ring gear is released, the output rotation 28 may rotate at high speed due to the reverse transmission of rotational force from the engine. The high-speed rotation of the output rotating shaft 28 due to reverse transmission from the engine is not transmitted to the DC motor 25 by the axial clutch device 3, but when the output rotating shaft 28 returns to its original position, the enlarged diameter portion 2
The rear end surface of the bearing 8b contacts the end surface of the flange-shaped bearing portion 32b of the bearing 32 while rotating at high speed. In this way the output rotation 111
The rear end surface of the enlarged diameter portion 28b of 28 does not come into direct contact with the front end surface of the rotating armature N26, but slides into contact with the thrust bearing portion 32b, so that wear of the rotating armature @26 and the output rotating shaft 28 can be prevented. Incidentally, as the output rotating shaft 28 returns, the tubular rod 39 is also pushed back, and as a result, the movable contact 41 separates from the fixed contact 46, and the current supply to the DC motor 25 is cut off.

In the above-mentioned embodiment, the bearing 32 had a front end outer peripheral edge of a cylindrical bearing part 32a which receives the load N at the front end (7 lantern-shaped bearing part 32b which mainly receives the thrust load). As shown in FIG. 2, a diameter-enlarging recess 26b that is relatively long in the axial direction is entirely formed on the inner circumferential portion of the front end side of the armature rotating shaft 26, and the diameter-enlarging recess 26b is further formed in the axial direction. Even when the long cylindrical bearing 50 is fitted and mounted, a similar effect is produced.That is, the front end of the bearing 50 contacts the rear end surface of the enlarged diameter portion 28b of the output rotation shaft 28, and the rear end has an enlarged diameter. Since it comes into contact with the inner end surface (the surface perpendicular to the axis) 26c of the recess 26b, it can receive both the radial load and the thrust load.

As shown in FIG. 3, a bearing 55 that receives only the VC thrust load is interposed between the face and the rear end face of the enlarged diameter part of the output rotating shaft 28. In order to prevent this from happening, an enlarged diameter recess 26d having a slight length in the axial direction is formed in the same inner part of the front end of the armature rotating shaft 26, and the diameter enlarged recess 26dfC is fitted with the bearing 55 in the form of a loam and fixed therein. However, the same effect can be achieved. However, in this case, since the separate 1ull receiver 56 is also safe to receive the radial load, there remains the problem that there are only two parts.

(Effects of the Invention) As explained above, according to the coaxial starter device of the present invention, the armature rotating shaft of the electric motor is tubular, and the output 1 rotating shaft is arranged on the same axis as the armature rotating shaft. When a part is inserted into the internal passage of the armature rotating shaft and supported so as to be able to slide in the axial direction, it is interposed between the front end surface of the armature rotating shaft and the rear end surface of the enlarged diameter part of the output rotating shaft. Since direct contact between the two can be avoided by the bearing, wear due to the difference in rotation between the two can be prevented, and a highly durable and reliable coaxial starter device can be provided. .

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the entire coaxial starter device according to an embodiment of the present invention, and Fig. 2 is a fragmentary sectional view showing another example of the @II bridge provided at the front end side of the armature rotating shaft of the electric motor. Figure, 3rd
The figure is a fragmentary cross-sectional view showing yet another example of a bearing provided on the front end side of the rotating shaft of the armature (b) of an electric motor, and Fig. 4 is a coaxial type that was proposed before the creation of the embodiment of the present invention. It is a sectional view showing a starter device. 20... Coaxial starter device, 25... DC power 1t
IJ machine, 26... Armature rotating shaft, 26a... Internal passage, 28... Output rotating shaft, 28b... Expanded diameter part, 29
... Drive force transmission device, 31... One-way clutch device, 32... Bearing, 33... Binion, 34... Electromagnetic switch device. Note that the same reference numerals in each figure indicate the same or corresponding parts. Figure 2 Figure 3 Procedural amendment (voluntary) 1. Indication of case Patent application No. 62-252983 2
, Name of the invention Coaxial starter device 3, Representative of the person making the amendment: Moriya Shiki 4, Agent', +L mountain N8・5, Claims of the specification to be amended and detailed description of the invention Column, Drawing 6, and Contents of Amendment (1) The description of the scope of this 9A patent claim will be corrected as shown in the attached sheet. (2) In this application, "placed... for return" described in page 11, line 11 of the specification is replaced with "placed, -
In order to maintain the ball 43 in the predetermined position shown in the figure, it is corrected to ``. (3) In the drawings of this application, Figures 1 and 4 will be corrected as shown in the attached sheet. 7. Inventory of attached livestock (1) Amended patent claims 1 copy (2)
Corrected drawings (Fig. 1 and Fig. 4, copies) 1 or more copies each, Claims (1) An electric motor having a tubular armature rotating shaft, and an engine disposed on the front end side of the electric motor and having an engine at one end. an output rotating shaft that is slidable in the axial direction, the other end of which has a pinion that engages and disengages from the ring gear of the armature rotating shaft, and an overrunning clutch device that is connected to the armature rotating shaft; a driving force transmission device that transmits rotation to the output rotating shaft via the overrunning clutch device; a surface of the armature rotating shaft perpendicular to the axis at or near the front end of the 1f Shinko rotating shaft; and the output rotating shaft; a coaxial type comprising a bearing disposed between the end face of the enlarged diameter portion formed in the motor; and an electromagnetic switch device disposed at the rear end side of the electric motor for energizing the electric motor and sliding the output rotation shaft at the same time. Starter device. (2) The bearing is fitted into an enlarged diameter recess formed on the inner circumference at the front end side of the armature rotating shaft, and the enlarged diameter recess has a long axial length. A coaxial starter device according to claim 1, characterized in that the bearing comprises a cylindrical body protruding from a front end surface. and a cylindrical bearing part that receives a radial load by being interposed between the outer circumferential surface of the first extraction part located in the internal passage of the output image/rotation shaft, and a cylindrical bearing part that receives a radial load, and a cylindrical bearing part that extends radially outward at one end edge of the radial bearing part. Claim 1, further comprising: a Franz-shaped bearing section interposed between one end surface of the overhanging armature rotating shaft and the end surface of the enlarged diameter portion of the output rotating shaft and receiving a 50-YU load. (4) The rear end of the cylindrical portion of the bearing has an eave end in front of the armature core attachment point of the electric motor. The coaxial starter device according to item 1 or 3.

Claims (4)

[Claims] (1) An electric motor having a tubular armature rotation shaft, and a pinion disposed on the front end side of the electric motor that engages and disengages with a ring gear of the engine at one end, and the other end is inserted into the internal passage of the armature rotation shaft. an output rotating shaft that is slidable in the axial direction; a driving force transmission device that has an overrunning clutch device and transmits rotation of the armature rotating shaft to the output rotating shaft via the overrunning clutch device; a bearing disposed at or near the front end of the child rotating shaft between a surface of the armature rotating shaft orthogonal to the axis and an end surface of an enlarged diameter portion formed on the output rotating shaft; and a rear end side of the motor. A coaxial starter device comprising: an electromagnetic switch device disposed in the motor for energizing the electric motor and sliding the output rotating shaft at the same time. (2) The bearing is fitted into an enlarged diameter recess formed in the inner circumference on the front end side of the armature rotating shaft, and has a longer axial length than the enlarged diameter recess and extends from the front end surface of the armature rotating shaft. Claim 1, characterized in that it consists of a protruding cylindrical body.
The coaxial starter device described in . (3) a cylindrical bearing part in which the bearing is interposed between the inner circumferential surface of the internal passage of the armature rotating shaft and the outer circumferential surface of a shaft portion of the output rotating shaft located in the internal passage and receives a radial load; , a flange-shaped bearing portion that extends radially outward at one end edge of the radial bearing portion and is interposed between one end surface of the armature rotation shaft and the end surface of the enlarged diameter portion of the output rotation shaft and receives a sliding load; A coaxial starter device according to claim 1, characterized in that it comprises: (4) The coaxial starter according to claim 2 or 3, wherein the rear end of the cylindrical portion of the bearing terminates before the armature core attachment position of the electric motor. Device.