JPH0660615B2 - Inertial jump starter - Google Patents

Description

TECHNICAL FIELD The present invention relates to an inertial jump-in starter used for starting an engine.

[Prior art]

Although FIG. 4 shows a conventional example, since the shape of the weight 6 on the stopper cover 5 side is an inclined surface having a steep angle, the clearance δ between the weight 6 and the stopper cover 5 when the pinion 4 is most advanced. The moving cylinder member including the clutch repeats forward and backward movements due to rotation fluctuation during cranking.
Due to the violent impact at this time, a loud sound is emitted, and strength becomes a problem.

[Purpose of the present invention]

In order to solve the above-mentioned problems, the present invention makes the maximum movement of the weight in the outer diameter direction by contacting the inclined surface of the weight with the movable cylinder member in a state where the movable cylinder member has moved to the maximum movement position to the pinion side. By restricting the position of the pinion, the clearance between the weight and the stopper cover when the pinion is most advanced is eliminated, and the generation of abnormal noise and the reduction in strength are prevented.

Example of the present invention

The present invention will be described below with reference to embodiments shown in the drawings. In FIGS. 1 and 2, the clutch is in the state shown in FIG. 1 when stationary. The shaft 1 and the clutch outer 3 are engaged by the helicum spline portions 1a and 3a, and the moving cylinder member including the clutch outer 3 is the helicum spline portion 1
It moves forward by the torsional thrust of a. The pinion 4 is formed integrally with the clutch inner 4a, and the inner 4a is arranged inside the outer 3 via the roller 3b, and the pinion 4 also moves forward similarly to the clutch outer 3. Shaft 1 and gear 12
And the weight cover 8 fixed to the gear 12
Three arcuate weights 6 are housed therein, as shown in FIG. 7, and these weights 6 are pressed in the axial direction of the shaft 1 by a garter spring 7 arranged on the outer peripheral side thereof. Clutch outer 3 and cylindrical stopper cover 5
Are integrated by the clutch cover 9, and when driven (state shown in FIG. 2), the weight 6 expanded by the centrifugal force comes into contact with the end portion of the cover 5 and the clutch cannot return. At the same time, the stopper cover 5 prevents the weight 6 from moving in the outer diameter direction and functions to prevent the weight 6 from scattering in the outer diameter direction. The weight cover 8 also functions to prevent the garter spring 7 from scattering in the outer diameter direction after the weight 6 is prevented from moving in the outer diameter direction. The shaft 1 is rotatably held in a housing 15 and is rotatably driven by a motor armature shaft 10 via a gear 12. Further, the weight 6 is prevented from moving in the axial direction by the weight cover 8 and the snap washers 13, and the weight 6 is fixed to the weight cover 8 so that the weight 6 can rotate in the same manner as the weight cover 8. .

Next, the operation of the above configuration will be described. When the starter is started, rotation is transmitted from the armature shaft 10 of the motor to the shaft 1 via the gear 12 and is transmitted to the clutch outer 3 by the engaged helical spline portions 1a and 3a, and the rotation of the helical spline portions 1a and 3a. The clutch moving cylinder member moves forward due to the torsional thrust, and the pinion 4 meshes with the engine side ring gear 11. At this time,
The weight 6 held by the garter spring 7 is overcome by the centrifugal force to overcome the restraining force of the garter spring 7 and spreads to the cover 5 which is integrated with the crack outer 3.
It engages with the end of the pinion 4 to prevent early return of the pinion 4. This state is shown in FIG.

Then, when the starter switch is turned off by starting the engine, the rotation of the shaft 1 is reduced, the rotational force of the weight 6 that has been rotating in the same manner as the shaft 1 is also reduced, and the restraining force of the garter spring 7 exceeds the centrifugal force of the weight 6. , The weight 6 is detached from the end of the stopper cover 5, and at the same time, the return spring 2 and the returning force of the helical splines 1a and 3a by the overrun pushes the clutch moving cylinder member in the axial direction to return to the stationary state shown in FIG. .

FIG. 2 shows a state in which the pinion meshes with the ring gear to drive the engine. Stopper cover 5 of weight 6
As shown in FIG. 3, the side surface has a gentle slope 6a with an angle θ.
The purpose is to suppress the flapping of the pinion 4 at the time of cranking, and the restraining force of the garter spring 7 and the angle θ and weight of the weight 6 are as shown in FIG. If f is set so as to overcome the component force F ₂ of the force F that the clutch moving tubular member tries to return, the clutch moving tubular member can be pressed forward and made stationary. Here, the slope of the weight 6 is sufficiently effective as compared with the conventional type even if only the gentle angle θ is provided, but by further providing the slope 6b having an angle α which is steeper than the gentle angle θ on the outer peripheral side of the slope 6a, Even if the terminal voltage of the battery decreases, the motor speed decreases, and sufficient centrifugal force is not applied to the weight 6, the weight 6 can be stopped on the slope 6b having a steep angle α as shown in FIG. I can avoid it.

In this embodiment, the angles θ and α are θ = 45 °, α
= 75 ° to 80 ° As a result of the experiment, as described above, when the motor rotation speed is high, the clutch is put on the front side to prevent the motor 6 from returning even when the rotation speed of the motor is reduced and the centrifugal force of the weight 6 is insufficient. do. Even in such extreme cases of the motor rotation speed, it is possible to sufficiently prevent the return.

It should be noted that the same action can be obtained even if the weight 6 is not provided with a two-step slope but is formed into an arcuate slope having a radius R as shown in FIG. 8 and a gentle slope and a steep slope are continuously formed. You can

Further, although the stopper cover 5 is provided as a separate member from the clutch cover 9 in the above-described embodiment, the stopper cover 5 may be integrally formed with the clutch cover 9.

[Effect of the present invention]

As described above, in the present invention, the movement of the weight in the outer diameter direction is restricted by the moving cylinder member when the moving cylinder member moves to the maximum movement position to the pinion side when the engine is started. , The weight prevents the longitudinal movement of the moving tubular member by abutting the moving tubular member without forming a clearance, so that the noise is generated due to the clearance being formed as in the conventional case. There is an excellent effect that it is possible to surely prevent early return of the movable tubular member while preventing the occurrence and the decrease in strength.

[Brief description of drawings]

FIGS. 1 and 2 are longitudinal sectional views showing a main portion of the embodiment of the present invention in a stationary state and a driven state, and FIG. 3 is a longitudinal sectional view showing a main portion of a weight in the above embodiment. Fourth
FIG. 5 is a vertical cross-sectional view showing the structure of the main part in the conventional example, FIGS. 5 and 6 are vertical cross-sectional views of the main part showing the structure of the weight portion used for the explanation of the operation in the above embodiment, and FIG. FIG. 8 is a front view showing the arrangement of weights, and FIG. 8 is a longitudinal sectional view showing another embodiment of the weights. 1 ... Shaft, 1a, 3a ... Helical spline part, 3, 3b, 4, 4a, 5, 9 ... Clutch outer, roller, pinion, clutch inner, stopper cover, clutch cover, 6 which constitute a moving tubular member ...... Weight, 6a ...... gentle angled slope, 6b ...... steep angled slope, 7 ...... Garter spring, 10 ...... motor armature shaft, 11 ...... ring gear.

Claims (2)

[Claims] 1. A moving cylinder member having a spline portion engaging with a spline portion provided on a shaft and a pinion moves axially by an inertial force when the motor is started, and the pinion serves as an engine ring gear. In an inertial jump-in starter that meshes and starts an engine, it is arranged on the shaft such that it cannot rotate relative to the shaft and is movable in the radial direction, and on the outer peripheral side,
An inclined surface having an angle Θ with the axis of the shaft is formed, and a weight that rotates integrally with the shaft and a spring that biases the weight in the inner diameter direction are provided. The state in which the weight is movable in the outer diameter direction against the biasing force of the spring by the centrifugal force generated by the rotation of the shaft, and the movable cylinder member is moved to the maximum movement position to the pinion side. In, in order that the weight is restricted to the maximum movement position in the outer diameter direction by contacting the inclined surface of the weight with the tubular member,
An inertia jump-in starter characterized by being set. 2. The inertial fly according to claim 1, wherein the weight is formed with a slope having a steeper angle than the slope on the outer peripheral side of the slope having the angle Θ. Built-in starter.