JPH07703Y2 - Starter motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention relates to a starter motor, and more particularly to a movement restricting means of an overrunning clutch mechanism in a starter motor for starting an internal combustion engine.

(Prior Art) Conventionally, a locking portion is provided in a tooth groove of a helical spline formed on an output rotary shaft that is driven according to rotation of an armature,
A starter motor which restricts forward movement of a spline tube constituting an overrunning clutch mechanism beyond a predetermined position is known as disclosed in Japanese Utility Model Publication No. 55-53727. This kind of starter motor is the fourth
Explaining from the example illustrated in the drawings, the output rotary shaft 3 of the armature 2 in the DC motor 1 includes a stepped portion 3a, and the helical spline 4 is separated from the stepped portion 3a by ₁ toward the axial end. Are formed.

The output rotating shaft 3 has an overrunning clutch mechanism 5
Is slidably fitted on the output rotary shaft 3. The overrunning clutch mechanism 5 is formed integrally with the overrunning clutch 6 including the clutch outer 6a and the clutch inner 6b, and the clutch outer 6a, and has a spline of axial length l ₂ (where l ₂ < ₁ ) on the inner peripheral surface. Consists of a spline tube 7 having teeth 7a, a pinion moving cylinder 8 which is integrally formed with the clutch inner 6b and has a pinion 8a for engaging with and driving a ring gear (not shown) of an engine on the outer periphery of the tip. Has been done.

By the way, the helical spline 4 formed on the output rotary shaft 3 is composed of a plurality of spline teeth 4a and a groove 4b between them as clearly shown in FIG. 5, and at least one groove 4b is seen in FIG. It is closed on the right side or front side.
The closed portion is indicated by reference numeral 4c. On the other hand, the spline teeth 7a in the spline tube 7 of the overrunning clutch mechanism 5 are the helical splines 4 of the output rotary shaft 3.
Are formed so as to mesh with every other groove 4b. Therefore, when the overrunning clutch mechanism 5 is fitted on the output rotary shaft 3, the spline teeth 7a of the spline tube 7 are passed through the unblocked groove 4b and the stepped portion 3a.
And the end of the helical spline 4 are located in the relief portion 9 (axial length ₁ ), and the spline engagement is disengaged here, so that the spline tube 7 is rotated by one mountain and at least one spline tooth 7a is closed. It is put back in the groove 4b. As a result, the overrunning clutch mechanism 5
When is moved forward, one of the spline teeth 7a of the spline tube 7 comes into contact with the closed portion 4c of the groove 4b, and further movement is blocked. Therefore, the closed portion 4c itself serves as a stopper that restricts the movement of the overrunning clutch mechanism 5 beyond the front stationary position.

Further, on the output rotating shaft 3, the spline teeth 7a of the spline tube 7 are not disengaged from the helical spline 4 of the output rotating shaft 3 when the overrunning clutch mechanism 5 is returned rearward (to the left in FIG. 1). A C-shaped washer 10 is attached to restrict further rearward movement,
The end portion of the spline tube 7 of the overrunning clutch mechanism 5 that has returned is brought into contact with.

In FIG. 4, reference numeral 11 is a shift lever for sliding the overrunning clutch mechanism 5, 12 is an electromagnet device for actuating the shift lever 11, and 13 is the outer peripheral surface of the output rotary shaft 3 and the pinion moving cylinder 8. Sleeve bearing interposed between the inner peripheral surface of the pinion and the inner surface of the pinion moving cylinder 8
Bearings for supporting the front bracket 15 of the starting motor.

(Problems to be Solved by the Invention) In the conventional starting electric motor as described above, when the overrunning clutch mechanism 5 slides, the stop at the rear stationary position is performed by the C-type washer 10 provided on the output rotary shaft 3. Was there. However, the coil ends 2b project at both ends of the core 2a of the armature 2, so that the C-shaped washer 10 cannot be provided closer to the core in the axial direction than the projecting end of the coil end 2b. That is, the C-type washer 10 cannot be attached (assembled) inside the protruding end of the coil end 2b. Therefore, the length of the inner side of the output rotary shaft 3 from which the coil end 2b protrudes becomes a dead space, which causes the total length of the starting electric motor to become long.

The purpose of the present invention is to solve the above-mentioned conventional problems, and the inner side of the coil end can be used as an escape portion for moving the spline tube, so that the axial length is shorter than the conventional one. Another object of the present invention is to provide a starter motor that can be downsized.

(Means for Solving Problems) A starter motor according to the present invention comprises a coil end projecting from both ends of an armature core, an output rotary shaft driven according to the rotation of the armature, and a slide shaft mounted on the output rotary shaft. An overrunning clutch mechanism movably fitted to a pinion moving cylinder having a spline tube having an inner peripheral surface formed with spline teeth meshing with a helical spline formed on the output rotary shaft and an engine driving pinion. An overrunning clutch mechanism, a closing portion provided in at least a part of a tooth groove of the helical spline formed on the output rotating shaft, for restricting forward movement of the spline tube beyond a predetermined position, and the pinion movement. It is provided at the front end of the cylinder and protrudes into the inside of the cylinder to come into contact with the end face of the output rotary shaft when the pinion moving cylinder moves rearward. A stopper device for restricting backward movement beyond a predetermined position, and the rear end portion of the spline tube of the overrunning clutch mechanism stopped at a predetermined rear position by the stopper device enters the inside of the coil end. It was done like this.

(Operation) According to the starting motor of the present invention, when the overrunning clutch mechanism is moved forward by the shift lever so that the pinion moving cylinder is projected from the front bracket to engage the pinion and the ring gear, the spline tube spline is moved. The teeth come into contact with the front end block portion of the block tooth groove in the helical spline of the output rotary shaft, and the forward movement beyond the predetermined position is stopped. On the other hand, when the overrunning clutch mechanism is returned to the rear stationary position by the shift lever after the engine is driven, the stopper device that is provided at the front end of the pinion moving cylinder and projects into the pinion moving cylinder contacts the tip of the output rotation shaft. Then, the overrunning clutch mechanism stops its rearward movement. Thus, since the stopper device for the backward movement of the overrunning clutch mechanism is provided at the front end of the pinion moving cylinder, the inside of the coil end projecting from the core of the armature serves as a relief portion for the spline tube. can do.

(Embodiment) Hereinafter, the starter motor 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 starting motor 20 according to an embodiment of the present invention. In FIG. 1 showing this embodiment, the same or corresponding components as those of the conventional starting motor shown in FIG. 4 are designated by the same reference numerals and the description thereof will be omitted.

In the starter motor 20 of this embodiment, a stepped portion 22 is formed in the output rotary shaft 21 of the armature 2 of the DC motor 1 near the end of the core 2a, and the stepped portion 22 extends forward from the stepped portion 22 by a length of ₁ . The same helical spline 4 shown in Fig. 5 from the position
Are formed. The shaft portion of this length ₁ is the above-mentioned relief portion 9. An overrunning clutch mechanism 23 is slidably fitted on the output rotary shaft 21. The overrunning clutch mechanism 23 is formed integrally with the overrunning clutch 6 and the clutch outer 6a mainly composed of the clutch outer 6a and the clutch inner 6b as in the conventional case, and is axially lengthed l ₂ ( However, it is formed integrally with the conventional spline tube 7 having helical spline teeth 7a of l ₂ ≦ ₁ ) and the clutch inner 6b, which is engaged with a ring gear (not shown) of the engine at the outer periphery of the tip to drive it. Pinion moving cylinder 2 having a pinion 24a
It is composed of 4 mag.

A screw hole 24b penetrating inward is formed in the center of the front end of the pinion moving cylinder 24, and a flat head screw 25 as a stopper device fits the head into the center hole 24c and does not project forward in this screw hole 24b. Are screwed together, and the tip thereof projects inside the pinion moving cylinder 24.

In the starting electric motor 20 configured as above, when the starting electric motor 20 is in the non-operating state, the overrunning clutch mechanism 23 is in the rear stationary position as shown in FIG. Is abutted against the end surface 21a of the output rotation shaft 21 and is prevented from moving beyond the rear stationary position. When the overrunning clutch mechanism 23 is moved forward, the stop at the stationary position is the front closing portion of the closing tooth groove of the helical spline 4 formed on the output rotary shaft 21 as already described in the conventional starting motor. This is done by bringing the spline teeth 7a of the spline tube 7 into contact with 4c.

According to the starting motor 20 as described above, there is no component to be assembled to the shaft portion of the output rotary shaft 21 located at the portion where the coil end 2b of the armature 2 is extended, so that the shaft portion is not attached to the spline teeth of the spline tube 7. 7a can be used as the escape portion 9 when meshing with the helical spline 4 of the output rotary shaft 21, and as a result, there is no dead space in the conventional starting motor of this type, and the shaft length is shortened accordingly. You can

In the embodiment shown in FIG. 1, a stopper device for stopping the overrunning clutch mechanism 23 at the rear stationary position is screwed into a through screw hole 24b provided at the center of the front end of the pinion moving cylinder 24. Although it is constituted by the countersunk screw 25, as shown in FIG. 2, the amount of protrusion of the tip of the bolt 26 into the pinion moving cylinder 24 can be adjusted by the bolt 26 and the washer 27. According to this, this washer 27
The rear rest position of the overrunning clutch mechanism 23 can be freely adjusted by changing the thickness and the number of the above, which allows the rest position of the pinion 24a in the starting motor housing to be freely adjusted. Therefore, the pinion
The gap between the 24a and the ring gear of the engine can be precisely kept constant, which contributes to quality improvement.

It should be noted that a spring clasp 28 such as a split pin as shown in FIG. 3 may be used in place of the countersunk screws and bolts as described above to obtain the same effect.

(Effect of the Invention) According to the starting motor of the present invention, the inside of the coil end is splined by providing the stopper device for stopping the rear stationary position of the overrunning clutch mechanism at the front end of the pinion moving cylinder of the overrunning clutch mechanism. It can be used as a relief part for the movement of, and the axial length of the starting motor can be shortened, and the size can be further reduced.

[Brief description of drawings]

FIG. 1 is a fragmentary sectional view showing a starting motor according to an embodiment of the present invention, and FIG. 2 is a stopper device for stopping a rear stationary position of an overrunning clutch mechanism in a starting motor according to another embodiment of the present invention. FIG. 3 is a fragmentary sectional view of a pinion moving cylinder, FIG. 3 is a sectional view similar to FIG. 2 showing another stopper device in a starter motor according to still another embodiment of the present invention, and FIG. FIG. 5 is a fragmentary sectional view showing the starting electric motor, and FIG. 5 is a front view showing a helical spline formed on an output rotary shaft in the conventional starting electric motor shown in FIG. 2 ... Armature, 4 ... Helical spline, 4a ... Spline tooth, 4b ... Tooth groove, 4c ... Closure part, 6 ... Overrunning clutch, 7 ... Spline tube, 7a ... Spline tooth, 9
… Escape part, 20… Starting electric motor, 21… Output rotary shaft, 22… Stepped part, 23… Overrunning clutch mechanism, 24… Pinion moving cylinder, 24a… Pinion, 25… Disc screw, 26… Bolt, 28
… Spring clasp. The same reference numerals in the drawings indicate the same or corresponding portions.

Claims (4)

[Scope of utility model registration request] 1. A coil end projecting from both ends of an armature core, an output rotary shaft driven according to the rotation of the armature, and an overrunning clutch mechanism slidably fitted to the output rotary shaft. There is an overrunning clutch mechanism including a pinion moving cylinder having a spline tube having an inner peripheral surface formed with spline teeth that mesh with a helical spline formed on the output rotating shaft, and an output rotating shaft. A closing portion provided in at least a part of the tooth groove of the formed helical spline to restrict forward movement of the spline tube beyond a predetermined position, and a closing portion provided at the front end of the pinion moving cylinder and protruding inside thereof. When the pinion moving cylinder moves rearward, the pinion moving cylinder comes into contact with the end face of the output rotary shaft to restrict the rearward movement beyond a predetermined position. And a stopper device, and the rear end portion of the spline tube overrunning clutch mechanism is stopped at a predetermined position behind the said stopper device starter motor, characterized in that as enters the inside of the coil end. 2. A start-up according to claim 1, wherein the stopper device comprises a stopper bolt screwed into a screw hole formed at the center of the front end of the pinion moving cylinder. Electric motor. 3. A utility model registration claim according to claim 1, wherein said stopper device is a split pin inserted into and engaged with a through hole formed at the center of the front end of said pinion moving cylinder. The starting electric motor according to the item. 4. The utility model registration claim, wherein the stopper device further comprises an adjusting washer for adjusting the amount of protrusion of the stopper bolt screwed into the screw hole in the pinion moving cylinder. A starting electric motor according to claim 2.