JPH0213155B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a thrust receiver for stopping movement of a shaft in a starter in a thrust direction.

Conventionally, the starter uses a magnetic switch to move the pinion 6b of the overrunning clutch 6 provided on the armature shaft 1 of the motor 10 to the left so that it meshes with the ring gear of the engine (not shown) as shown in FIG. 7, the overrunning clutch 6 is moved to the left by a drive lever 9, and at this time, the overrunning clutch 6 is moved to the left by a torsion spline 11 with respect to the armature shaft 1. It is adapted to be propelled toward the housing 5 side, and its axial movement is restricted by a stop collar 4 that abuts on 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, movement in each direction is regulated by the side surface of the commutator 13 and the end frame 14, and movement in the left direction is restricted by the armature shaft 1. The thrust washer 15 is held between the stepped portion of the housing 5 and the housing 5.

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

The present invention has been made to solve the above-mentioned drawbacks, and an object of the present invention is to provide a starter that can reduce costs by using common parts without increasing the number of parts.

To achieve the above object, the present invention provides a starter in which an overrunning clutch is slidably disposed on an armature shaft supported by a housing and an end frame. It comprises a snap ring fitted in the annular groove, a first stop collar that restricts the movement of the overrunning clutch on the armature shaft, and a second stop collar that restricts the movement of the armature shaft itself relative to the housing, The first and second stop collars are fitted onto the armature shaft with the snap ring sandwiched between them, each having at least one protrusion that engages with the outer peripheral surface of the snap spring, and under the engagement relationship, the snap spring It is characterized by being held by the elastic force of. Further, the first and second snap collars are characterized in that they each have approximately the same shape.

The present invention will be explained below with reference to embodiments shown in the drawings. In FIG. 2, which is an embodiment of the present invention and is a sectional view of a main part, which is also the main part configuration of FIG. 1, the armature shaft 1 in the starter motor 10 is
One end is supported by the housing 5 via a bearing member 12, and the other end is supported by the end frame 1 as shown in FIG.
It is supported by 4. An annular groove 1a is formed around the entire circumference of the armature shaft 1, and a snap ring 2 is loosely attached to the armature shaft 1. A second stop collar 4' is arranged on the housing 5 side. first and second stop collars 4,
4', as shown in the perspective view of FIG.
4b', and a flat surface 4d between the protrusions 4c, and the snap ring 2 has a first
The inner surface 4a of the second stop collar 4 and the inner surface 4a' of the second stop collar 4' are brought into contact with each other, and the grooves 4b and 4b' of the respective stop collars 4 and 4' are engaged with each other.
The first stop collar 4 and the second stop collar 4' each have a protruding portion 4c provided with grooves 4b and 4b', and a flat portion 4 having no grooves 4b and 4b'.
d and 4d' are combined so as to face each other, and an overrunning member 4e, which is slidably supported on the armature shaft 1 via a bearing member 12, is attached to the end face 4e of the first stop collar 4 on the side of the overrunning clutch 6. The end face 6a of the running clutch 6 abuts against the housing 5 of the second stop collar 4'.
The housing 5 is installed on the armature shaft 1 so that the end surface 5a of the housing 5 comes into contact with the side end surface 4e'.

Next, the operation when the first and second stop collars 4, 4' having the above structure are applied to the starter shown in FIG. 1 will be explained. Magnetic switch 7
When the plunger 8 is energized, the plunger 8 moves to the right, and this movement moves one end (upper end) of the drive lever 9 to the right, and the other end moves the overrunning clutch 6 to the left, which causes the ring gear of the engine (not shown) to move to the right. and the pinion 6b of the overrunning clutch 6 are engaged with each other. Then, when a contact (not shown) of the magnetic switch 7 is closed and the motor 10 is energized, rotational force is generated in the motor 10 and the engine is started. 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 abuts the end surface 4e of the first stop collar 4, and the first stop collar 4 is restricted in its movement by the snap spring 2 that is in contact with the annular groove 1a of the armature shaft 1, so that its movement in the axial direction with respect to the armature shaft 1 is restricted. Also, at this time, the armature shaft 1 moves toward the housing 5 due to the inertia of the overrunning clutch 6.
Since the snap ring 2 contacts the inner surface 4a' of the second stop collar 4', the end surface 4e' of the second stop collar 4' contacts the end surface 5a of the housing 5, and the armature shaft 1
The axial movement of the ring gear (not shown) and the pinion 6b of the overrunning clutch 6 are maintained in an appropriate axial position by the first stop collar 4 and the second stop collar 4', thereby ensuring engine drive. can be done. After the engine is driven, the armature shaft 1 rotates at high speed, and the snap spring 2 is inserted into the groove 4b formed in the protrusion 4c of each stop collar 4, 4'.
Since the outer circumference is held by engaging with, it will not fly out due to centrifugal force. Furthermore, after the starter is driven, each part of the starter vibrates violently due to engine vibration, and each stop collar 4, 4' also vibrates from side to side on the armature shaft 1, but the snap spring 2 expands in the radial direction due to its own elastic force. Since each stop collar 4, 4' is held by the engagement relationship of the projections 4c, 4c' with the grooves 4b, 4b', each stop collar 4, 4' does not come off from the snap ring 2. In addition, if a force greater than the elastic force is applied to the snap spring 2 from the housing 5 side to the first stop collar 4, and from the overrunning 6 side to the second stop collar 4, each stop collar 4, 4' can be easily adjusted. Since it can be removed at any time, it can be reused even when repairing or disassembling parts of the starter without damaging them.
Repair costs can be reduced.

In the above embodiment, the stop collars 4, 4' have three protrusions 4c, but as shown in FIG. 4a and FIG. A groove 4b and a flat portion 4d may be provided, or a larger number of protrusions may be provided. Further, in the above embodiment, the shape of the protrusion 4c of the stop collars 4, 4' is a part of a fan shape centered on the axis, but the shape is changed so that the width B of the flat part 4d is parallel. , processing may be made easier.

As described above, according to the present invention, a snap spring fitted in an annular groove formed on the circumferential surface of an armature shaft, a first stop collar that restricts movement of an overrunning clutch on the armature shaft, and a second stop collar that restricts the movement of the armature shaft itself relative to the housing. Each of the armature shafts has at least one protrusion that engages with each other, and is held by the elastic force of the snap spring under the engagement relationship. Therefore, the structure of providing steps in the conventional armature shaft can be abolished, and the strength of the shaft is improved. This prevents lowering of the armature shaft and eliminates the step of machining the stepped portion of the armature shaft. In addition, since the armature shaft does not have a step, the bearing diameter is increased compared to the conventional one, so the bearing length can be shortened by the increase in bearing performance, making the starter more compact.
It has many effects such as improved starter installation.
Further, in the present invention, each of the first and second stop collars has at least one protrusion, and the protrusion is engaged with the snap spring, and under the engagement relationship, the elastic force of the snap ring causes the first stop collar to close the first stop collar.
Since a structure for holding the second stop collar is adopted, the first and second stop collars can be assembled extremely simply and easily.

Furthermore, if the first and second stop collars are made to have approximately the same shape, there is an excellent effect that costs can be reduced by using common parts.

[Brief explanation of drawings]

Fig. 1 is a sectional front view of the main parts of a conventional starter, Fig. 2 is a sectional view showing the main part configuration of an embodiment of the present invention, Fig. 3 is a perspective view of the stop collar in the present invention, and Fig. 4 is a main part configuration of the starter. FIG. 5 shows a stop collar according to another embodiment of the present invention, in which a is a front view and b is a sectional view. FIG. DESCRIPTION OF SYMBOLS 1... Armature shaft, 2... Snap ring, 4... First stop collar, 4c... Projection, 4'... Second stop collar, 5... Housing, 6... Overrunning clutch.

Claims (1)

[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, the overrunning clutch is fitted into an annular groove formed on the circumferential surface of the armature shaft. a first stop collar that restricts movement of the overrunning clutch on the armature shaft; and a second stop collar that restricts movement of the armature shaft itself relative to the housing; The second stop collar is fitted onto the armature shaft with the snap ring sandwiched therebetween, and each has at least one protrusion that engages with the outer circumferential surface of the snap spring, and under the engagement relationship, the elastic force of the snap spring is reduced. A starter characterized by being held by. 2. The starter according to claim 1, wherein the first and second stop collars have substantially the same shape.