JPH0631182Y2 - Governor device for starter motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a governor device for a starter motor mounted on a traveling machine body such as an automobile or a motorcycle.

[Problems to be Solved by Prior Art and Invention] Generally, in this kind of starter motor, a gear shaft that is interlockingly connected to the motor unit side rotates in the same direction as the rotation of the gear shaft by driving the motor unit. Then, the clutch inner and the clutch outer rotate integrally to transmit power, and in the reverse rotation, the one-way rotating clutch configured to freely rotate relative to each other and not transmit power is helically spline fitted. There is one in which this one-way rotating clutch is moved forward along the helical spline by the inertial force associated with the driving of the motor section so that the pinion gear meshes with the engine ring gear to start the engine. In such a starter motor, at the time of engine starting operation, the governor weight, which receives a centrifugal force, is displaced outward against the weight spring in the forward rotation state of the one-way rotation clutch, and the displacement is caused. There is provided a governor device configured to prevent the pinion from returning quickly by engaging and locking the governor weight with a stepped portion formed in the cabana case. By the way, the weight spring is designed to be engaged with the protrusion formed on the side surface of the governor weight in a stepped shape, but conventionally, the edge portion where the protrusions of the adjacent governor weights face each other has a tapered surface shape. At most, the chamfered part is formed. Therefore, when the governor weight is displaced outward and the weight spring is extended,
As shown in FIG. 4, the chamfered portion 15c at the edge of the protrusion acts as an edge and acts on the weight spring, and as a result, the surface pressure of the portion of the weight spring becomes locally high. However, there is a problem that local wear is caused by vibration and the smooth operation of the weight spring is impeded, and the life of the weight spring is shortened, so that the stability of the governor performance is impaired.

[Means for Solving the Problem] The present invention was devised with the object of providing a governor device for a starter motor capable of eliminating these drawbacks in view of the above-mentioned circumstances, and a drive of a motor unit. A gear shaft that rotates in conjunction with the gear shaft is helically spline-fitted with a one-way rotating clutch that transmits power in rotation in the same direction as rotation of the gear shaft and does not transmit power in rotation in the opposite direction, In a starter motor configured to advance the pinion provided on the side of the one-way rotating clutch by the inertial force associated with the rotation of the gear shaft to start the engine, the one-way rotating clutch is rotated by the rotation of the one-way rotating clutch. A governor weight is provided to prevent the fast-returning of the advanced pinion by deflecting outward due to the centrifugal force caused by the movement and abutting against the step portion, and the governor weight is provided with a governor weight. In order to form a protrusion for engaging a ring-shaped weight spring that urges the weight to the original posture side, the chamfers of the edge portions where the protrusions of the adjacent governor weights face each other are made into an arc shape and the governor is formed. With the weight protruding outward,
It is characterized in that the weight spring is in contact with the arcuate chamfer.

The present invention, with this structure, can prevent the edge-shaped interference of the governor spring with the governor weight and greatly contribute to the stability of performance.

[Embodiment] Next, an embodiment of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes a starter motor, and a gear 2 formed on a motor shaft 2 in a motor portion of the starter motor 1.
A driven gear 3 is meshed with a. A unidirectional rotating clutch 5 is helically spline-fitted to a gear shaft 4 on which the driven gear 3 is integrally supported. That is, the one-way rotating clutch 5 includes a clutch inner 6 fitted to the gear shaft 4 by the helical spline 4a, a clutch outer 8 integrally formed with a pinion gear 7, and a clutch roller interposed between the clutch inner 6 and the clutch outer 8. It is composed of 9 etc.,
When the gear shaft 4 rotates in the same direction as the motor unit is driven, the clutch roller 9 bites between the clutch inner 6 and the clutch outer 8 in a tightening manner to integrally rotate the clutch inner 6 and the clutch outer 8. When the clutch roller 9 rotates in the opposite direction, the clutch roller 9 idles, and the clutch inner 6 and the clutch outer 8 rotate freely relative to each other so that the power is not transmitted. The one-way rotating clutch 5 is integrally rotated by the rotation of the gear shaft 4 accompanying the driving of the motor section, but the inertial force at this time causes the helical spline 4a to move against the ammunition 10. As the vehicle moves forward, the pinion gear 7 meshes with the ring gear 11 on the engine side to start the engine.

Reference numeral 12 denotes a governor device, and a tubular governor case 13 constituting the governor device 12 has an axial movement and a shaft center rotation with respect to the gear shaft 4 in a state where the tubular bottom portion 13a contacts the driven gear 3. Is integrally fixed to the gear shaft 4 side so that the rotation of the gear is restricted. On the other hand, although the governor holder 14 is integrally fixed to the clutch inner 6, the governor holder 14 is provided with three governor weights 15 formed by cold forging in the present embodiment around the circumference. ing. Moreover, on the surface of the governor weight 15 on the one-way rotating clutch 5 side, the protrusion 15a is formed in a step shape,
An annular weight spring 16 is wound around this. As described above, as the clutch inner 6 rotates in the state in which the one-way rotating clutch 5 is advanced in association with the rotation of the gear shaft 4 associated with the motor drive, the governor weight 15 receives centrifugal force. Weight spring 16
The governor weight 15 is biased outwardly against the vertical direction and is biased outwardly, and the governor weight 15 has a step portion 13 b formed in the governor case 13.
It has a structure to prevent fast return by abutting and locking.

In this case, in the governor weight 15, the chamfered portion 1 in which the edge portion of the protrusion 15a is set in an arc shape.
5b is formed, and the weight spring 16 is in contact with the chamfered portion 15b having an arc shape in a posture in which the governor weight 15 is displaced outward.

In the embodiment of the present invention constructed as described above, when the motor unit is driven to start the engine, the driven gear 3 and the gear shaft 4 are integrally rotated in conjunction therewith, whereby the unidirectional movement is achieved. The rotary clutch 5 moves forward along the helical spline 4a by inertial force, and the pinion gear 7 meshes with the ring gear 11 to start the engine.

In this way, the engine is started, but when the one-way rotating clutch 5 is advanced, the governor weight 15 that rotates integrally with the clutch inner 6 receives centrifugal force and resists the weight spring 16 to move outside. In this case, the weight spring 16 has the chamfered portion 15b formed at the end edge of the protrusion 15a formed in an arc shape. In the outwardly displaced state, the chamfered portion 15b is formed into the shape of an edge and interferes with the weight spring 16 without fail, so that the weight spring 1 is reliably prevented.
There is no local high surface pressure acting on 6 and, as a result, it is possible to prevent local abnormal wear of the site due to vibration, etc., and to stabilize the quality of the governor device. In addition to making a great contribution, the performance of the starter motor can be improved and the engine can always be reliably started.

[Advantages] In summary, since the present invention is configured as described above, the governor weight receives the centrifugal force in the state where the one-way rotating clutch is advanced at the time of starting the engine. However, in this case, the end edge of the protrusion where the weight spring is engaged has an arcuate chamfer, and the governor weight is displaced outward. In this case, the weight spring comes into contact with the arcuate chamfered portion. Therefore, the weight spring does not have the problem of coming into contact with the edge portion when it is displaced outward as in the past, and the surface pressure is locally high, which promotes wear due to vibration. Can be effectively avoided, and the life of the weight spring can be extended with a simple structure, which can significantly contribute to the stabilization of quality and can improve the performance of the governor device, thus ensuring a reliable engine start. Is what you can do.

[Brief description of drawings]

The drawings show an embodiment of a governor device for a starter motor according to the present invention. FIG. 1 is an overall sectional view of the starter motor, FIG. 2 is a front view of a governor weight portion, and FIG. FIG. 4 is an operation explanatory view in which an essential part of the governor weight portion is enlarged, and FIG. 4 is an operation explanatory view of a conventional example. In the figure, 1 is a starter motor, 3 is a driven gear, 4 is a gear shaft, 5 is a one-way rotating clutch, 12 is a governor device, 1
Reference numeral 3 is a governor case, 13b is a stepped portion, 15 is a governor weight, 15a is a protruding portion, 15b is a chamfered portion, and 16 is a weight spring.

Claims (1)

[Scope of utility model registration request] Claim: What is claimed is: 1. A gear shaft, which rotates in association with driving of a motor section, transmits power to the gear shaft in the same direction as the rotation of the gear shaft.
A one-way rotating clutch that does not transmit power in the opposite direction is helically spline-fitted, and the pinion provided on the one-way rotating clutch side is advanced by the inertial force associated with the rotation of the gear shaft to start the engine. In the starter motor configured as described above, the one-way rotating clutch is subjected to centrifugal force caused by the rotation of the one-way rotating clutch to be biased outward and brought into contact with the stepped portion to prevent the forward pinion from returning quickly. In addition to providing a governor weight to perform, to form a protrusion for engaging a ring-shaped weight spring that biases the governor weight to the original posture side, the protrusions of adjacent governor weights are The chamfers of the opposing edge parts are arcuate, and the weight spring contacts the arcuate chamfer with the governor weight protruding outward. Governor of the starter motor, characterized in that.