JPS63205458A - Starter - Google Patents

Abstract

PURPOSE:To damp any shock transmitted from an over-running clutch to a housing by arranging a pair of stop-collars facing each other on both sides of a snap ring held on an armature and also forming the snap ring elastic- deformably in a wavy shape. CONSTITUTION:A groove 1a having predetermined width n is formed on an armature shaft 1, and a snap ring 2 is loosely engaged with the groove. Respective stop collars 4, 4' are arranged with the snap ring 2 held there between on over-running clutch 6 side and a housing 5 side respectively. The snap ring 2 is provided with a plurality of bent portions 2a, 2b which is deviated by m1, in relation to the diameter d of raw material in the direction of a motor shaft at equal intervals in the circumferential direction, and is formed in a wavy shape. Thereby, the bent portion 2a on the side of a pinion 6 is forced to abut the groove end portion 4a of one side stop-collar 4 and the bent portion of a housing 5 side is forced to abut the groove end portion 4a' of the other stop-collar 4'.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a stop structure for an overrunning clutch in a starter.

``Prior Art'' Conventionally, as shown in FIG. 6, the starter is moved to the left so that the binion 6b of the overrunning clutch 6 provided on the armature shaft 1 of the motor 10 meshes with the ring gear 3 of the engine. , the operation of the plunger 8 of the magnetic switch 7 causes the drive lever 9 to move the overrunning clutch 6 to the left. 5 side, and axial movement is regulated by a stop collar 4 that abuts a snap ring 2 provided on the armature shaft 1. In this starter, the armature shaft 1 is supported by the housing 5 and the end frame 14, and movement in the right direction is restricted by the side surface of the commutator 13 and the end frame 14, and movement in the left direction is restricted by the step of the armature shaft 1. The thrust washer 15 is held between the housing 5 and the housing 5.

Due to the above configuration, it is necessary to provide a step on the armature shaft 1, which requires a machining process, and also reduces the strength of the armature shaft and the bearing performance due to a decrease in the bearing diameter by increasing the bearing length. There were serious shortcomings that needed to be compensated for.

In order to eliminate the above-mentioned drawbacks, the present inventor previously proposed
A stop structure for a starter overrunning clutch as shown in Japanese Patent No. 136568 was proposed. However, this scooter includes a first stop collar that restricts the movement of the clutch on the armature shaft and a second stop collar that restricts the movement of the armature shaft itself relative to the housing, and the first and second stop collars are The forward force of the clutch is transmitted to the armature shaft through the first stop collar and the snap ring, and the forward force of the armature shaft is is transmitted to the housing via the snap ring and the second stop collar, so the impact load when the pinion engages is easily transmitted to the housing, and the housing that receives this impact load needs to have a corresponding strength, and the wall thickness It is necessary to make it thicker.

"Problems to be Solved by the Invention" The present invention has been made to solve the above problems, and its purpose is to provide a starter with a structure that absorbs the impact load when the overrunning clutch moves forward. do.

"Means for Solving the Problems" In order to achieve the above object, the present invention provides the following features: on an armature shaft supported by a housing and an end frame;
In a starter in which an overrunning clutch is slidably disposed, a first stop collar restricts movement of the overrunning clutch on the armature shaft, and a second stop collar restricts movement of the armature shaft itself relative to the housing. The first and second stop collars are disposed in opposing combinations on both sides of a snap ring held on the armature shaft, and the snap rings are connected to each other through the first stop collar. It is characterized in that it is formed in a wave shape so that it can be elastically deformed between itself and the end surface of the housing via the second stop collar upon receiving the forward force of the overrunning clutch.

"Operation" According to the above configuration, the impact force when the overrunning clutch moves forward is absorbed by the wave-shaped snap ring flexing to reduce its width in the axial direction, and is transmitted to the housing through the second stop collar. Therefore, excessive impact is not applied to the housing, and damage to the housing can be prevented.

[Embodiment] According to a first embodiment of the present invention, the armature shaft is provided with a groove in which the snap ring is loosely attached. This embodiment has the advantage that the corrugated snap ring is held on the armature shaft with a simple structure.

A second embodiment is characterized in that the first and second stop collars each have a protrusion that holds the outer periphery of the snap ring at at least one location for assembly. According to this aspect, the first and second
This has the advantage that the stop collars are simply and reliably combined on both sides of the wavy snap ring.

A third aspect is characterized in that the first and second stop collars each have approximately the same shape. According to this aspect, there is an advantage that parts can be shared.

Embodiment Next, an embodiment of the present invention will be described with reference to FIGS. 1 to 5 and the conventional example shown in FIG. 6.

In FIG. 1, which is a cross-sectional view of a main part, which is also the main part configuration of FIG. It is supported by an end frame 14 as shown in FIG. The armature shaft 1 is formed with a armature 1a having a width n, and a snap ring 2 is loosely attached thereto.
A first stop collar 4 is disposed on the overrunning clutch 6 side with the snap ring 2 in between, and a second stop collar 4' is disposed on the housing 5 side. The first stop collar 4 is shown in the perspective view in FIG. 4 and in the perspective view in FIG.
) and (b), it has a protrusion 4e provided with a groove 4b and a flat part 4d between the protrusion 4C. Although the second stop collar 4'' is not shown, it has approximately the same structure as the first stop collar 4, so it will be described as shown.

As shown in the perspective view of Fig. 3, the snap ring 2 has bent portions 2a and 2b that are offset by ml in the motor axis direction with respect to the material diameter (plate thickness in the case of a plate) d, and are arranged at equal intervals in the circumferential direction. It is formed into a waveform with multiple waveforms, and the total is 11 = d + 1
ml, the bending part 2a on the pinion 6 side contacts the groove end 4a of the first stop collar 4, and the bending part 2b on the housing 5 side contacts the groove end 4a' of the second stop collar 4°. is in contact with each stop collar 4.4
' is held by the arms 4b and 4b'. and,
The first stop collar 4 and the second stop collar 4' are in contact with each other 4b.

4b' with protrusions 4e, 4c' and grooves 4b, 4b'
The flat parts 4d, 4d' which do not have a flat surface are combined so as to face each other, and the deflection of the snap ring 2 is slightly larger than that between the projections 4e, 4c' and the flat parts 4d, 4d'. It is configured to have a gap -2. Snap ring 2 has a stop collar of 4°4”, 4b and 4b.
', the first and second
A stop collar of 4.4° is maintained. An end surface 6a of the overrunning clutch 6, which is slidably supported by the armature shaft 1, comes into contact with an end surface 4e of the first stop collar 4 on the overrunning clutch 6 side.
End face 4 on the housing 5 side of the second stop collar 4°
E+ is provided on the armature shaft 1 so that the end surface 5a of the housing 5 comes into contact with the armature shaft W.

"Operation" Next, the operation when the snap ring 2 having the above configuration is applied to the starter shown in FIG. 6 will be described.

When the magnetic switch 7 is energized, the plunger 8 moves to the right, and this movement pulls one end of the drive lever 9, and the other end of the drive lever 9 moves the overrunning clutch 6 to the left, closing the engine ring gear. 3 and the pinion 6b of the overrunning clutch 6 are engaged. and the contact 16a of the magnetic switch 7.

16b is closed and the motor 10 is energized, the motor 10
rotational force is generated and starts the engine. At this time, the overrunning clutch 6 is propelled toward the housing 5 by the torsion spline 11 on the armature shaft 1, but the end surface 6a of the pinion 6b comes into contact with the end surface 4e of the first stop collar 4, and as shown in FIG. As shown, the movement of the first stop collar 4 is restricted by the snap ring 2 in contact with the groove 1a of the armature shaft 1, so that the overrunning clutch 6 is restricted from moving in the axial direction with respect to the armature shaft 1. At this time, if the propulsive force of the overrunning clutch 6 is generated excessively,
As shown in FIG. 2, the impact load is absorbed by the snap spring deflecting from 1 to 12, and a relaxed propulsive force is transmitted to the armature shaft 1. The armature shaft 1 receives the propulsive force and moves toward the housing 5, but
Since the snap ring 2 comes into contact with the 4° groove end 4a' of the second stop collar, the end surface 4e" of the second stop collar 4" comes into contact with the end surface 5a of the housing 5, and the armature shaft 1 is brought into contact with the housing 5. The axial movement of the ring gear 3 and the pinion 6b of the overrunning clutch 6 is maintained by the first stop collar 4 and the second stop collar 4', and the engine starts. This can be done reliably.After the engine starts, the armature shaft 1 rotates at high speed, but the snap ring 2 maintains its outer circumference by the arms 4b and 4b' provided on the protrusions 4e and 4c' of each stop collar 4° and 4°. so it won't fly out due to centrifugal force, and
After starting, each part of the starter vibrates violently due to the vibration of the engine, and each stop collar 4° and 4° also vibrates from side to side on the armature shaft 1, but the snap ring 2
It expands in the radial direction due to its own elastic force, and the protrusion 4e,
4c' grooves 4b, 4b' each stop collar 4,4
Since the angle is maintained, each stop collar 4,4' will not come off from the snap ring 2.

When repairing and disassembling each part of the starter, remove the housing 5 and apply a force greater than the elastic force to the snap ring 2.
The first stop collar 4 is given from the housing 5 side,
If the second stop collar 4' is applied from the overrunning clutch 6 side, each stop collar 4.4' can be easily removed, so even when repairing or disassembling various parts of the starter, the parts can be reused without damage, reducing repair costs. can be lowered.

"Other Embodiments" In the above embodiments, the protrusions 4c and 4c' of the stop collar 4° and the bent portions 2a and 2 of the snap ring 2 are
Although b is set to 3 locations, it may be set to 28 locations, 4 locations, or other combinations of numbers may also be used.9 "Effects" As described above, according to the present invention, the overrunning clutch can be moved on the armature shaft. A first stop collar for regulating movement and a second stop collar for regulating movement of the armature shaft itself relative to the housing are provided, and the first and second stop collars are arranged on both sides of the snap ring held on the armature shaft. The snap ring receives the forward force of the overrunning clutch through the first stop collar, and is elastically deformed between the snap ring and the end surface of the housing through the second stop collar. Since it is formed into a smooth wave shape, it has excellent effects such as not increasing the number of parts, preventing excessive impact from being applied to the housing, and eliminating the need to make the housing thick.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing the main structure of an embodiment of the present invention, and FIG.
The figure is a sectional view showing the operation of the embodiment, FIG. 3 is a perspective view of a snap ring in the embodiment of the present invention, FIG. 4 is a perspective view of the first stop collar, and FIGS. 5(a) and (b). is the first
FIG. 6 is a front view and a cross-sectional view of the stop collar of FIG. 6, and FIG. 6 is a cross-sectional view of a conventional starter. 131. Armature shaft, 1a...Wai・20
0. Snap ring, 4.4°11. First and second stop collars, 4c, protrusion, 509. Housing, 611. Overrunning clutch, 14
,,,end frame.

Claims (4)

[Claims] (1) In a starter in which an overrunning clutch is slidably disposed on an armature shaft supported by a housing and an end frame, a first stop collar that restricts movement of the overrunning clutch on the armature shaft; and a second stop collar for restricting movement of the armature shaft itself relative to the housing, the first and second stop collars being arranged in combination and facing each other on both sides of a snap ring held on the armature shaft. and is held by a snap ring, the snap ring receiving the forward force of the overrunning clutch via the first stop collar, and being connected to the end surface of the housing via the second stop collar. A starter characterized by being formed into a wave shape so that it can be elastically deformed. (2) The starter according to claim 1, wherein the armature shaft is provided with a groove in which the snap ring is loosely attached. (3) The first and second stop collars each have at least one protrusion that holds the outer circumferential portion of the snap ring in order to be assembled together. Starter. (4) The starter according to claim 1, wherein the first and second stop collars each have substantially the same shape.