JPH0616975Y2 - Inertial jump start motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an early return preventing mechanism for a pinion in an inertia jump start type motor.

[Conventional technology]

In the conventional type, as shown in FIG. 5, the space ring 20 is press-fitted onto the outer periphery of the shaft 1 so as to come into contact with the step 1b on the end surface of the helical spline portion 1a of the shaft 1. As shown in FIGS. 6 (a) and 6 (b), the space ring 20 includes a tubular portion 20a press-fitted into the shaft 1, a disc portion 20b bent from an end surface of the tubular portion 20a, and a disc portion 20b. It is composed of three projecting portions 20c projecting to the outer periphery.

Reference numeral 21 denotes a weight, which has an arc shape as shown in FIGS. 7 (a) and 7 (b), and has a space ring 20 on one end surface.
The recess 21a into which the protrusion 20c of
A step portion 21b for accommodating the garter spring 7 is formed.

Reference numeral 8 denotes a weight holder, which is a disk portion 8a that comes into contact with the end surface of the cylindrical portion 20a of the space ring 20, and the disk portion 8a.
And a cylindrical portion 8b that is bent from the outer circumference of the weight 21. The cylindrical portion 8b regulates the movement of the weight 21 toward the outer circumferential side in the radial direction.

When an attempt is made to start the starter, rotation is decelerated and transmitted from the motor unit (not shown) to the shaft 1 via the armature shaft 16 and the drive gear 12, and the engaged helical spline unit 1a causes the clutch to rotate. The moving cylindrical member is transmitted to the outer 2 and is moved forward by the torsional thrust of the helical spline portion 1 a, and the pinion 4 meshes with the ring gear 11. At this time, the garter spring 7
The weight 21 that has been pressed down overcomes the restraint force of the garter spring 7 by the centrifugal force. Then, the weight 21 contacts the inner circumference of the cylindrical portion 8b of the weight holder 8. At the same time, the end of the cover 5 integrated with the clutch outer 2 contacts the end surface of the weight 21 to prevent the pinion 4 from returning from the ring gear 11 early.

[Problems to be Solved by the Invention] However, in the above-mentioned conventional one, as shown in FIG. 6 (b), one space ring 20 is provided between the end surface of the disk portion 20b and the end surface of the tubular portion 20a. It is necessary to determine the dimension A, the axial length dimension B of the tubular portion 20a, and the inner diameter dimension C of the tubular portion 20a.

That is, the drive gear 12 is pressed through the weight holder 8 into the shaft 1 by pressing the space ring 20 toward the step 1b. At this time, the dimension A needs to maintain the dimension D from the right end surface of the drive gear 12 to the tip. This dimension D is such that the shaft 1
5 is important when assembling into the housing 5, and if the dimension D is too large, the housing 15 cannot be assembled.
That is, in order to manage the dimension D, the dimension from the step 1b of the shaft 1 to the drive gear 12 is important,
That is, the variation of the dimension A becomes a problem.

Next, the dimension B needs to be slightly larger than the axial length of the weight 21 in order to maintain normal sliding of the weight 21 in the radial direction. It is necessary that the disk portion 20b is at a right angle.

Finally, for the dimension C, the space ring 20 needs to be press-fitted onto the outer periphery of the shaft 1, and the tightening at that time needs to be accurately performed. Therefore, the cylindrical portion 2 of the space ring 20
It is necessary to finish the inner periphery of 0a by grinding or the like to obtain a dimensional tolerance.

That is, when the space ring 20 is formed by press drawing or the like, swelling, sinking, or the like occurs, and the above-described dimensions A and B are generated.
It is very difficult to form the space ring 20 so as to simultaneously satisfy the above conditions, and conversely, if the dimensions A and B are to be obtained by grinding or the like, it takes a lot of grinding man-hours and the like, resulting in an increase in cost. There is.

Further, there is a problem that a grinding step is required to obtain the dimensional tolerance of the inner circumference of the cylindrical portion 20a of the space ring 20, and the number of steps is increased.

[Means for solving problems]

In view of the above-mentioned conventional problems, the present invention has a starter motor having an armature shaft, a drive shaft having a helical spline portion and a step formed on the outer periphery thereof, and a moving shaft splined to the helical spline portion of the drive shaft. A tubular member, a washer that comes into contact with the step of the drive shaft, an end face of the washer, a tubular collar provided on the outer periphery of the drive shaft, and an end face of the collar that extends in the radial direction. The disk part,
A weight holder having an engaging portion that is bent in the axial direction on the washer side from the end of the disk portion, and the washer, the collar, and the weight holder on the drive shaft so as to press the step on the drive shaft. Being fixed, engaging with the weight holder,
A drive gear that transmits the rotation of the armature shaft of the starter motor to the shaft and the weight holder, and is held by the weight holder so as to be immovable in the rotational direction with respect to the weight holder and movably in the radial direction, A weight that is arranged on the outer periphery of the collar, rotates with the rotation of the drive shaft, moves to the outer peripheral side in the radial direction by the centrifugal force of this rotation, and this movement is restricted by the locking portion of the weight holder, A spring that prevents the weight from expanding in the radial direction when the weight is stationary and that the drive shaft expands in the radial direction by the centrifugal force of the weight at a predetermined rotation speed, and the weight holds the weight holder. A stopper for restricting the axial movement of the movable tubular member when the movement is restricted by the section, It is to be an inertia jump-in starter motor equipped with it.

〔Example〕

The present invention will be described below with reference to the embodiments shown in the drawings. In the first embodiment shown in FIG. 1, the shaft 1 has a helical spline portion 1a on its outer periphery and is rotatably held by a housing 15 via bearings 13 and 14.
The clutch outer 2 is in helical spline engagement with the helical spline portion 1 a of the shaft 1. The pinion 4 is connected via a roller 3 arranged on the inner circumference of the clutch outer 2 and is rotatably provided on the outer circumference of the shaft 1. Then, the clutch outer 2, the roller 3, and the pinion 4 form a movable tubular member. Reference numeral 11 denotes a ring gear of the internal combustion engine, which meshes with the pinion 4.

Reference numeral 9 denotes a disk-shaped flat washer having a width a, abutting on a step 1b which is an end surface of the helical spline portion 1a of the shaft 1 and loosely fitted to the outer periphery of the shaft 1.

Reference numeral 10 denotes a tubular collar that is loosely fitted to the outer periphery of the shaft 1, has a width b in the axial direction, and has one end surface in contact with the flat washer 9.

Reference numeral 8 denotes a weight holder, as shown in FIGS. 3 (a) and 3 (b), which is in contact with the other end surface of the collar 10 and which extends to the outer peripheral side in the radial direction with respect to the shaft 1, and the disk portion 8a. And a cylindrical portion 8b which is bent toward the flat washer 9 side from the outer peripheral end portion. Further, a hole 8c through which the shaft 1 penetrates and three slits 8d formed on the radially outer side of the hole 8c are formed in the center of the disk portion 8a, and a protrusion 8e formed by punching or the like is formed on the outer circumference. Is also integrally formed.

Reference numeral 6 denotes a weight, which has an arc shape as shown in FIGS. 4 (a) and 4 (b), and three weights 6 form a ring shape. A step 6a is formed on the weight holder 8 side of the weight 6, and a projection 6b that engages with the slit 8d of the weight holder 8 is formed from the step 6a. The weight 6 is arranged on the outer periphery of the collar 10 and between the flat washer 9 and the disk portion 8a of the weight holder 8, and the protrusion 6b of the weight 6 is engaged with the slit 8d of the weight holder 8 to 6 is movable only in the radial direction.

Reference numeral 7 denotes a garter spring housed in the step portion 6a of the weight 6, and the spring force of the garter spring 7 presses the weight 6 against the outer periphery of the collar 10.

A drive gear 12 presses the flat washer 9 against the step 1b via the weight holder 8 and the collar 10 when the drive gear 12 is press-fitted onto the outer periphery of the shaft 1. A recess 12a that fits into the projection 8e of the weight holder 8 is formed on the end face of the drive gear 12, and the projection 8e is fitted into the recess 12a so that the weight holder 8 is attached to the shaft 1.
It cannot be rotated.

Further, 16 is an armature shaft of the starter motor. Further, a thrust washer 17 is inserted between the drive gear 12 and the housing 15.

The cover 5 forming the stopper portion is fixed by winding the clutch cover 2a around the clutch outer 2 and is arranged between the cylindrical portion 8b of the weight holder 8 and the weight 6 when not in operation. .

18 is a stopper of the pinion 4, and the stopper 18
A return spring 19 is inserted between the pinion 4 and the pinion 4.

Next, the operation of the above configuration will be described. When the starter is started, rotation is decelerated and transmitted from the motor unit (not shown) to the shaft 1 via the armature shaft 16 and the drive gear 12, and the helical spline unit 1a engaged with the clutch outer 2 And the moving cylinder member advances due to the torsional thrust of the helical spline portion 1a, and the pinion 4 meshes with the ring gear 11.

At this time, the weight holder 8 is fitted to the drive gear 12 by the protrusion 8e and the recess 12a, the rotation of the drive gear 12 is transmitted to the weight holder 8, and the protrusion 6 of the weight 6 is also included.
By engaging b with the slit 8d of the weight holder 8, the rotation of the weight holder 8 is transmitted to the weight 6. That is, the rotation of the shaft 1 is transmitted to the weight 6, and as shown in FIG. 2, the weight 6 held by the garter spring 7 overcomes the restraining force of the garter spring 7 by the centrifugal force. Then, the weight 6 contacts the inner circumference of the cylindrical portion 8b of the weight holder 8. At the same time, the end portion of the cover 5 integrated with the clutch outer 2 contacts the end surface of the weight 6 to prevent the pinion 4 from returning from the ring gear 11 early.

Also, if the starter (not shown) is switched off, the rotational force of the shaft 1 is reduced, the rotational force of the weight 6 that has been in the same rotational movement as the shaft 1 is also reduced, and the constraint force of the garter spring 7 is the centrifugal force of the weight 6. The weight 6 is released from the inner periphery of the locking portion 8c of the weight holder 8 by virtue of the force, and at the same time, the return force of the helical spline 1a by the return spring and the overrun causes the clutch moving tubular member to push down the weight 6 in the axial direction. It returns to the stationary state shown in FIG.

As described above, the weight holder 8 is attached to the drive gear 1
No rotation is possible with respect to 2, and the weight 6 is movable only in the radial direction with respect to the weight holder 8, so that the collar 10 is not press-fitted into the shaft 1. Grinding becomes unnecessary, and by separating the collar 10 and the flat washer 9, the axial length b of the collar 10 can be easily cut to obtain a correct length by cutting the round material into a predetermined length. is there. Further, the width a of the flat washer 9 can be accurately obtained. That is, color 1
By controlling 0 and the flat washer 9 separately, accurate axial length accuracy can be obtained.

[Effect of device]

As described above, in the present invention, the collar that requires the axial length for sliding the weight in the radial direction and the washer that restricts the axial movement of the weight are separately provided. The axial length and the width of the washer can be accurately set, and there is no need to grind the inner peripheral side of the collar, so that the man-hour can be reduced.

[Brief description of drawings]

FIG. 1 is a half sectional view showing a stopped state in an embodiment of the inertial jumping start motor of the present invention, and FIG. 2 is a half sectional view showing an operating state of the inertial jump start motor in FIG. Figure
(a) and (b) are front views and sectional views showing the weight holder, respectively, and FIGS. 4 (a) and (b) are front views showing the weights, respectively.
Sectional view, FIG. 5 is a half sectional view showing a conventional inertial jump-in starter motor, and FIGS. 6 (a) and 6 (b) are front view, sectional view, and FIG. 7 of the space ring in FIG. 5, respectively. (a), (b) is the front view and sectional drawing of the weight in FIG. 5, respectively. 1 ... Drive shaft, 1a ... Helical spline part, 1b
… Steps, 2, 3, 4… Clutch outer, rollers, pinions, 5… stopper covers that make up the moving tubular member,
Reference numeral 6 ... Weight, 7 ... Garter spring, 8 ... Weight holder, 8a ... Disk portion, 8b ... Cylindrical portion forming locking portion, 8d
... slits, 8e ... protrusions, 9 ... flat washers, 10 ... collars, 11 ... ring gears, 12 ... drive gears, 12a ...
Recess, 16 ... Armature shaft.

Claims (3)

[Scope of utility model registration request] 1. A starter motor having an armature shaft, a drive shaft having a helical spline portion and a step formed on an outer periphery thereof, a movable tubular member spline-connected to the helical spline portion of the drive shaft, and a step of the drive shaft. A washer which abuts, an end face of the washer, a cylindrical collar provided on the outer periphery of the drive shaft, and a disc portion which abuts the end face of the collar and extends in the radial direction,
A weight holder having an engaging portion that is bent in the axial direction on the washer side from the end of the disk portion, and the washer, the collar, and the weight holder on the drive shaft so as to press the step on the drive shaft. Being fixed, engaging with the weight holder,
A drive gear that transmits the rotation of the armature shaft of the starter motor to the shaft and the weight holder, and is held by the weight holder so as to be immovable in the rotational direction with respect to the weight holder and movably in the radial direction, A weight that is arranged on the outer periphery of the collar, rotates with the rotation of the drive shaft, moves to the outer peripheral side in the radial direction by the centrifugal force of this rotation, and this movement is restricted by the locking portion of the weight holder, A spring that prevents the weight from expanding in the radial direction when the weight is stationary and that the drive shaft expands in the radial direction by the centrifugal force of the weight at a predetermined rotation speed, and the weight holds the weight holder. A stopper for restricting the axial movement of the movable tubular member when the movement is restricted by the section, Inertial jump-starting electric motor equipped. 2. The inertia jump start type electric motor according to claim 1, wherein the weight holder is fitted to the drive gear at an uneven portion. 3. A protrusion is formed on the weight, and a disk portion of the weight holder is formed with a hole that extends in the radial direction and engages with the protrusion, and the weight is attached to the weight holder. The inertial jumping starter electric motor according to claim 2, wherein the utility model is registered so that it cannot rotate in the rotation direction but can move in the radial direction.