JPS5821105B2 - engine starting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention cranks the engine by rotating a pinion gear meshed with the ring gear of the engine from the starting motor via a one-way clutch when starting the engine. When the pinion gear is driven at high speed, the releasing action of the one-way clutch prevents a reverse load from acting on the starting motor.
This invention relates to an engine starting device.

In general, when starting an engine, especially in cold weather when it is difficult to start, the irregular explosion of the engine causes severe rotational vibrations on the crankshaft, and immediately after a failed start, the crankshaft also experiences rotational vibrations due to the repulsive force of the compressed gas in the cylinder. The reverse direction component of these rotational vibrations becomes an overload and is transmitted from the ring gear to the pinion gear, but in conventional starting devices, the overload is directly transmitted to each part of the transmission system from the ring gear to the output shaft of the starting motor. As a result, when this action occurs, the two gear meshing parts, the one-way clutch engagement part, etc. are hit and worn and damaged, resulting in a problem of lowering the durability of the device.

SUMMARY OF THE INVENTION An object of the present invention is to provide the above-mentioned starting device, which does not cause problems like the conventional ones even when rotational vibration is applied from the ring gear to the pinion gear.

Hereinafter, embodiments of the present invention will be explained with reference to the drawings.
M is a starting motor, and the device of the present invention is housed in a casing 1 connected to the front end of the stator.

A cylindrical shaft 3 is rotatably fitted to the output shaft 2 of the starting motor M, which is rotatably supported by the casing 1, and an advance sleeve 4 is attached to the outer periphery of the front half of the cylindrical shaft 3 via a linear spline 5. Fits slidably.

In addition, a pinion gear 6 is rotatably and slidably fitted to the output shaft 2 in front of the cylinder shaft 3 (on the right side in the figure), and a ring gear 7 of the engine is waiting in front of the pinion gear 6, with which it meshes when moving forward. let

A rear end plate 8a of a cylindrical clutch case 8 is slidably fitted onto the outer periphery of the advance sleeve 4.
is clamped by a stopper plate 10 and a circlip 11 fixed on the advance sleeve 4 together with a buffer member 9 such as rubber inserted into the clutch case 8 .

The clutch case 8 has serrated clutch teeth 1 on opposing surfaces.
2a and 13a, respectively, and a one-way clutch C consisting of a clutch spring 14 that springs the driving clutch body 12 in the direction of engagement with the driven clutch body 13, Drive clutch body 12
is a helical spline 1 on the outer periphery of the advance sleeve 4.
5, the driven clutch body 13 is integrally connected to the rear end of the pinion gear 6, and its front end is supported by a circlip 16 that is engaged with the front end of the clutch case 8.

A plurality of centrifugal weights 17 are provided inside the driven clutch body 13.
(one of which is shown in the figure) is supported via a pin 18 so that they can move in the radial direction, and an operating ring 19 having a tapered surface 19a that engages with the weight 17 is connected to the drive clutch body 12. to fit into.

The rear end of the advance sleeve 4 has the circlip 11
A flange plate 20 is fixed by another circlip 11' at the rear of the flange plate 20, and a flange plate 20 is pivoted to the casing in an annular groove 21 defined between the flange plate 20 and the end plate 8a of the clutch case 8. The lower end of the shift fork 23 is engaged with the lower end of the shift fork 23, and the movable iron core 24 of the electromagnetic actuator S installed in the lateral bulge 1a of the casing is connected to the upper end.

The movable iron core 24 is always urged forward by a return spring 25, and a solenoid 26 for sucking it backward is connected to a power source via a starting switch (not shown).

A switch case 2B containing a starting switch 27 for the starting motor M is attached to the rear side of the electromagnetic actuating device S.

This starting switch 27 has a pair of fixed contacts 29.29' attached to the rear wall of the switch case 28, and a rear protruding shaft 24a of the movable iron core 24, and when it moves backward by a certain stroke, it contacts both rotating contacts 29.29'. It is composed of a movable contact 30 attached so as to make contact with it.

On the other hand, an overload clutch C2 is interposed between the output shaft 2 and the cylindrical shaft 3, which automatically opens when overload is applied.

This clutch C2 includes a drive clutch body 31 fixed to the base of the output shaft 2, a driven clutch body 32 which is slidably fitted to the outer periphery of the rear half of the cylinder shaft 3 via a linear spline 34, and a cylinder. Seat plate 3 fixed to the outer periphery of the intermediate portion of the shaft 3
5 and a plurality of disc-shaped clutch springs 33 that are contracted between the driven clutch body 32, and both clutch bodies 31 and 32.
Serrated clutch teeth 31a are formed on each opposing surface of the serrated clutch teeth 31a.

32a, the slope is the clutch tooth 1 of the one-way clutch C□
The direction is opposite to that of 2a and 13a.

In addition, in the figure, 36 is the stopper ring of the cylinder shaft 3, and 37 is the seat plate 3.
5 stopper ring.

Next, the operation of this embodiment will be explained.

Now, if you turn on the start switch and energize the solenoid 26 of the electromagnetic actuator S, the movable iron core 2 will be activated by the action of the magnetic force.
4 to the rear (to the left in the figure) against the elastic force of the return spring 25, and shift the clutch case 8 together with the advance sleeve 4 forward (to the right in the figure) via the shift fork 23. The pinion gear 6 is advanced to the meshing position with the ring gear 7 (the chain line position).

During this time, if the pinion gear 6 collides with the side surface of the ring gear 7 due to misalignment of its teeth, the forward movement of the pinion gear 6, both clutch bodies 12, 13 of the one-way clutch C1, etc. will be temporarily stopped, and the clutch case 8 Since the advance sleeve 4 moves forward while compressing the clutch spring 14, sliding occurs at the fitting portion between the advance sleeve 4 and the drive clutch body 12, and as a result, the helical spline 15 moves against the drive clutch body 12 in a certain direction. When the driven clutch body 13 and pinion gear 6 are rotated in the same manner, and the tooth traces of both gears 6.7 match, the elastic force of the clutch spring 14 causes both clutch bodies 12.13 to rotate. It moves forward again, and thus the pinion gear 6 can be reliably engaged with the ring gear 7.

Almost at the same time as the pinion gear 6 meshes with the ring gear 7, the movable iron core 24 moves backward, causing the start switch 27 to
is closed and the starting motor M starts to rotate the output shaft 2, which drives the ring gear 7 via the overload clutch C2, cylinder shaft 3, advance sleeve 4, one-way clutch C and pinion gear 6, so that the engine is cranked and started.

By the way, if extreme rotational vibration occurs in the crankshaft due to engine cranking, irregular explosion, etc., and the component in the reverse direction becomes an overload and acts on the pinion gear 6 or the output shaft 2, the overload clutch C2 The axial component of the rotational force acting on the slopes of the opposing clutch teeth 31a and 32a resists the pressing force of the clutch spring 33 and separates the driven clutch body 32 from the driving clutch body 31, causing the clutch teeth 3
1a.

32a mutual slippage occurs to avoid overload effects.

Then, when the overload is removed, the driven clutch body 32 returns to the engagement position with the driving clutch body 31 due to the action of the clutch spring 33.

Next, when the engine enters a stable self-rotation state, a so-called complete explosion state, and the ring gear 7 continues to rotate at a faster speed than the pinion gear 6, both clutch teeth 12a and 13a of the one-way clutch C1 first become clutchless. The centrifugal weight 17 slides against the drive clutch body 14 to retract the driving clutch body 12, and then, when the rotational speed of the pinion gear 6 increases above a certain value, the centrifugal weight 17 that rotates together with the driven clutch body 13 is rotated by the action of the centrifugal force. By sliding in the radial direction along the pin 18, the actuating ring 19 is moved backward by pressing its tapered surface 19a, thereby maintaining the retracted position of the drive clutch body 12 and opening the one-way clutch C□. Therefore, the starting motor M will not overrun due to the reverse load of the engine.

Immediately turn off the starting switch and turn it back on.

25 to return the clutch case 8 to the backward position shown in the figure via the shift fork 23 and open the start switch 27, the pinion gear 6 separates from the ring gear 7 and stops rotating, so the centrifugal weight 17 absorbs the centrifugal force. The one-way clutch C1 returns to the engaged state due to the elastic force of the clutch spring 14.

The one-way clutch C□ used in the present invention may be of any type, such as a ratchet type or a roller type.

As described above, according to the present invention, the transmission path between the output shaft 2 and the pinion gear 6, which is equipped with the one-way clutch C1 that prevents the reverse load of the engine from being transmitted to the starting motor, is automatically operated when an overload is applied. Since the overload clutch C2, which opens automatically, is interposed in series with the one-way clutch C1, overload is transmitted from the ring gear 7 to the pinion gear 6 due to rotational vibration of the crankshaft due to irregular explosion etc. during engine startup. During this time, the overload clutch C2 can be automatically opened to cut off the interlocking relationship between the pinion gear 6 and the motor output shaft 2, and therefore the overload is applied to each part of the transmission system from the ring gear 7 to the motor output shaft 2. It is particularly effective in preventing wear and damage of the retaining part of the one-way clutch C1 and the meshing part of the pinion gear 6 and ring gear 7, etc., and greatly improves the durability of the device. It is something that can be done.

[Brief explanation of the drawing]

The drawing is a longitudinally sectional side view of a main part of an embodiment of the device of the present invention. 2...Output shaft, 6...Pinion gear,
7...Ring gear, C...One-way clutch, C2...Overload clutch.

Claims (1)

[Claims] 1. A starting device in which a one-way clutch C1 is interposed in the transmission line between the output shaft 2 of the starting motor M and the pinion gear 6 that meshes with the ring gear 7 of the engine, and which automatically opens when a reverse load is applied to the pinion gear 6. An engine starting device according to the invention, characterized in that an overload clutch C2 that automatically opens when an overload is applied is interposed in the transmission line in series with the one-way clutch C1.