JPS5915671A - Inertia jump-in type starting motor - Google Patents

Abstract

PURPOSE:To prevent early return of a clutch, by providing a staged part on the cover of a clutch moving cylinder part and engaging the staged parts of weights with the staged part of the cover when the weights spread out. CONSTITUTION:Three weights 6 and housed within a cover 8 on a shaft 1, and are pressed in the direction of the axis of the shaft 1 by a garter spring 7. The weights 6 are placed in the cover 8 having a positioning projection 8a on a brim part 8c and in a hole in the direction of diameter in the shaft 1, and perform the same rotational movement as that of the shaft 1 by means of a pin 10 engaging with an inner peripheral groove 8b of the cover 8. A clutch outer 3 is assembled integrally with a cover 5 provided with a staged part 5a on the inner periphery, and the weight 6, spreading out by a centrifugal force at a driving time, mate the staged part 5a of the cover 5, resulting in preventing the clutch from returning.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) The present invention relates to prevention of early return of a clutch in an inertial plunge starter motor.

The clutch of a conventional inertial plunge-type starter motor has a problem in that it temporarily disengages from the ring gear due to rotational fluctuations immediately after starting the internal combustion engine.

Therefore, the present invention is characterized in that a return prevention mechanism is provided on the shaft to prevent early return. That is, the weight is housed within the cover behind the spline portion of the shaft. This weight is pressed down in the axial direction of the shaft by a spring, and the weight is, for example, a protrusion on the cover, or the cover and the shaft are connected by a pin so that the weight can rotate in the same direction as the shaft. Also, the washer with the protrusion and the groove on the shaft prevent the weight from moving forward. Here, the rotation of the starter is transmitted to the shaft, the clutch moving cylinder moves forward, and the binion meshes with the ring gear. At this time, the centrifugal force of the weight exceeds the restraining force of the spring, the weight expands, and the weight fits into the stepped part of the cover (2), so that the clutch moving cylinder part cannot return. When the starter switch is turned off, the rotational force of the shaft decreases, and the restraining force of the garter spring exceeds the centrifugal force of the weight, causing the weight to separate from the stepped portion of the cover and return to its rest position. The movable cylinder section returns to the standby state due to the return force of the helical spline due to the return spring and overrun.

The present invention aims at preventing the weight from returning by providing a stepped portion on the cover of the clutch moving cylinder so that when the weight is expanded, the stepped portion of the weight fits into the stepped portion of the cover.

Embodiments of the present invention shown in the drawings will be explained below.

In FIG. 81 and FIG. 2, when the clutch is at rest, the clutch is in the upper half state of FIG. 1. The shaft I and the clutch outer 3 are engaged by the helical spline portion la, and the movable cylinder member is moved forward by the torsional thrust of the helical spline portion la. The pinion 4 also moves forward in the same way as the clutch outer 3. Three weights 6 are housed in the cover 8 of the shaft 1-1-lx (3), and are pressed in the axial direction of the shaft 1 by a garter spring 7. The weight 6 is housed in a radial hole on the shaft 1 and a cover 8 having a positioning protrusion 8a on the collar 8c, as shown in FIG. The bin 10 enables the same rotational movement as the shaft l. Further, if a weight assembly is formed by integrating the cover 8, the weight 6, and the garter spring 7, the IJT can be easily assembled. A protrusion 9a provided on the outer periphery of a washer 9 press-fitted into an annular groove 1b of the shaft l is a protrusion 6a provided on the weight 6 so that the weight 6 can only move in the radial direction.
work as a guide. The clutch outer 3 and the cover 5, which has a stepped portion 5a on the inner circumference, are integrated, and the weight 6 that spreads out due to centrifugal force during driving (lower half state in Fig. 1) covers the cover 5. It will fit into the stepped portion 5a and the clutch will not return. At the same time cover 5 is weight 6
It works to prevent scattering towards the outer circumference. Further, the shaft 1 is rotatably held in a housing 15 via bearing metals 13 and 14, and is rotationally driven by a motor via a gear 12. Cover 8 Top 8
c is pressed by the protrusion 15a of the housing 15 via the thrust bearing 16, and is sandwiched between the thrust bearing 16 and the washer 9 without a gap, thereby preventing the cover 8 from moving in the axial direction.
A weight 6 is held between the top portion 8C and the washer 9 with a slight gap therebetween.

Next, the operation will be explained with reference to the second configuration.

When the starter is started, rotation is transmitted from the motor section (not shown) to the shirt 1 via the gear 12, and the helical spline section 1a is engaged.

3a, the force is transmitted to the clutch outer 3, and the clutch movable cylinder member moves forward due to the torsional thrust of the helical spline portions 1a and 3b, and the binion 4 meshes with the engine side ring gear 11. At this time, the weight 6 that was being held down by the garter spring 7 overcomes the restraining force G of the garter spring 7 due to centrifugal force and expands to the cover 5 that is integrated with the crack outer 3 (5), and the stepped part 5a and When they fit together, the weight 6 becomes an obstacle for the clutch outer 3 and the clutch cannot be returned. This state is shown in the lower half of FIG.

When the switch of the starter part (not shown) is turned off, the rotational force of the shaft 1 decreases, and the rotational force of the weight 6, which was rotating in the same direction as the shaft 1, also decreases, and the restraining force of the garter spring 7 overcomes the centrifugal force of the weight 6. The weight 6 separates from the stepped portion 5a, and at the same time, the clutch moving cylinder member pushes down the weight 6 in the axial direction due to the return force of the return spring 2 and the helical splines la and 3a due to overrun, and the weight 6 is brought to a stationary position as shown in the upper half of FIG. Return to state.

In the above-described embodiment, the bottle IO is inserted into the hole of the shaft 1, and the weight 6 and cover 8 are connected to the shirt).
Although the shaft 1 can perform the same rotational movement as 1,
The same effect can be obtained by attaching a ceresillon to the inner diameter of the cover 8.

As described above, the weight 6 is easily assembled as an assembly by the holding means such as the garter spring 7, and is also movable in the same rotational motion (6) as the shaft 1 and in the radial direction.

Furthermore, in the embodiment described above, the weight 6 is expanded and its outer diameter supports the clutch moving cylinder, but as shown in FIGS. 3 and 4, the weight 6 has a fulcrum 6
The same effect can be obtained by providing a retaining means such as a combination spring IA and a protrusion 8d of the weight cover 8 instead of the garter spring 7. Note that in this embodiment, the ring 17 is connected to the pin 10.
The ring 17 is fixed to the L reshaft 1 so as not to rotate, and the cover 8 is fixed to this ring 17 by brazing.

Further, a protrusion 6e is provided on the inner diameter side of the weight 6, and in the rest position, the cover 5 fixed to the clutch 3 is located on the inner circumference side of the protrusion 6e of the weight 6, as shown in the upper part of FIG. , during driving, as shown in the lower half of Fig. 3, the fulcrum 6 is expanded due to the centrifugal force.
By moving the protrusion 6e of the weight 6 toward the center using d as a fulcrum, the protrusion 6e engages with the end surface of the cover 5, thereby preventing the clutch 3 from returning. here,
(7) Although only one of the weights 6 is shown in FIG. 4, a pair of weights 6 are provided facing each other at symmetrical positions on the cover 8.

As described above, in the present invention, a weight assembly is formed by holding a weight and a spring on a shaft with a cover, which do not move in the axial direction but can expand in the radial direction and rotate integrally with the shaft. When the pinion expands due to the centrifugal force, it becomes an intervening object between the movable cylinder member and the shaft and constitutes an early return prevention mechanism. In addition to reliably preventing premature engagement of the gear, the binion can be quickly disengaged from the ring gear by stopping the rotation of the motor, and by holding the weight and spring with the cover, it is possible to quickly disengage the binion from the ring gear. Furthermore, since the weight does not move in the axial direction together with the movable cylinder member, it is possible to prevent an increase in impact force due to an increase in the inertia of the movable cylinder member, and to reduce the impact applied to the weight assembly. Power too (
8) It has the excellent effect of being able to do a little.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of the configuration of the main parts of the electric motor of the present invention, FIG. 2 is an exploded perspective view of the configuration of the main parts of the electric motor shown in FIG. 1, and FIGS. 3 and 4 are the motor of the invention FIG. 6 is a vertical cross-sectional view and a front view showing another example of the main part configuration of the FIG. 1...Shaft, la, 3a...Spline part, 3
゜4.5... Thalassochia outer constituting the movable cylinder member. Binion, cover, 6... weight, 7... garter spring, 7A... combination spring, 8... cover. Representative Patent Attorney Takashi Okabe (9) m1 Figure 2 Figure 3 Figure 4 d

Claims (1)

[Claims] A movable cylinder member with a spline cut on the shaft that engages with the spline moves in the axial direction due to inertia when the motor starts, meshes with the ring gear of the engine, and starts the engine. In an electric motor, a weight is provided on the shaft, which does not move in the axial direction but can expand in the radial direction, and rotates integrally with the shaft; A weight assembly is formed by holding a spring set so that the weight can expand in the radial direction due to the centrifugal force of the weight with a cover, and the weight is an intervening object between the movable cylinder member and the shaft. An inertial plunge starter motor with an early return prevention mechanism.