JPS6136778Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement in reducing the size of an engine starting device.

An example of this type of device was the one shown in FIG. In FIG. 1, 1 is a starter motor screwed onto an internal combustion engine 2 by a hexagonal bolt 3, 4 is a ring gear of the internal combustion engine 2, and 5 is a pinion 6 that is meshed with this ring gear. 7 is an output rotating shaft of an armature 8 that is spline engaged with the overrunning clutch and urges rotation, and 9 is a shift lever that moves and forces the overrunning clutch forward (to the right in the figure). The fulcrum portion 9a is rotatably supported by the front bracket 10. Reference numeral 11 denotes a sleeve bearing (flat bearing device) which is fitted onto the inner circumferential surface of the front end of the nose portion 10a of the front bracket and pivotally supports the front end of the output rotating shaft 7;
Reference numeral 2 denotes a stopper that abuts and locks the front end surface of the pinion 6 when it is protruded, and 13 is a washer fitted to the rear part of the clutch outer 14 of the overrunning clutch 5, which is engaged with the cam portion 9b of the shift lever 9. It's a groove.

Next, the operation of the apparatus having the above configuration will be explained. An electromagnetic switch (not shown) is energized, and the shift lever 9 engaged with the electromagnetic switch is moved to the fulcrum portion 9.
It is biased to rotate counterclockwise around point a, presses the shoulder portion (shown (A)) of the clutch outer 14 of the overrunning clutch 5, and is moved forward (to the right in the diagram) and biased. This bias brings the pinion 6 into meshing engagement with the ring gear 4, and after the pinion 6 reaches the contact position with the stopper 12 and is sufficiently engaged, the electromagnetic switch 4 (not shown) An electrical contact (not shown) is closed, and the armature 8 is energized and energized to generate rotational force, and this rotational force is applied to the output rotating shaft 7, the clutch outer 14, and the pinion 6 which is unidirectionally rotationally engaged and energized with the clutch outer. The ring gear 4 is rotationally urged (cranked) via. The rotational force reaction force due to the gear bias is transferred to the front bracket 10 via the sleeve bearing 11.
The stress is further transmitted to the engine 2, and the stress is received by the engine 2. After the engine 2 is started, the pinion 6 is reversely biased by the rotational force of the ring gear 4, but the pinion 6 idles on the output rotation shaft 7 due to the one-way rotational engagement of the overrunning clutch 5. After the engine is started, the above-mentioned bias is released, and the shift lever 9 presses and biases the washer 13 rearward (to the left in the figure).
Returns to the state shown.

As described above, the conventional device has the disadvantage that the output rotating shaft bearing mechanism and the overrunning clutch transfer force mechanism are arranged in the axial direction, and that the length in the axial direction is necessary for the function. Furthermore, the nose portion 10a of the front bracket 10 has an open structure to the internal space of the engine 2, and there are also drawbacks such as the lack of a dustproof and waterproof function between the nose portion 10a and the engine.

This idea was made to eliminate the drawbacks of the conventional device as described above. By supporting the outer circumferential surface of the pinion and engaging the outer circumference of the overrunning clutch housing with the shift lever cam, the overall length is shortened and the dustproof and
The purpose is to provide an engine starting device (starting motor) with excellent waterproof function.

An embodiment of this invention will be described below with reference to the drawings. In FIG. 2, 15 is a starter motor, 16 is an overrunning clutch, 17 is a clutch outer, and an output rotating shaft 19 is fixed to an armature 18.
Helical spline 2 created on the outer peripheral surface of the central part of
0 and is spline engaged. Further, an engagement groove 22 for the shift lever 21 is provided on the outer peripheral surface, a cam portion 23 is provided on the inner peripheral surface, and a clutch inner 24 is provided on the inner peripheral surface.
A roller 25 is installed in the wedge-shaped space formed between the two, and a rotating engagement mechanism is formed. 26 is a washer for engaging the clutch 24, 27 is a cover for assembling the constituent members as shown in the figure, and 28 is a pinion that has the same outer diameter as the clutch inner 24 and is integrally constructed with an outer peripheral surface. Quenched and polished. Reference numeral 29 denotes a sleeve bearing fitted to the inner circumferential surface of the pinion, and is slidably fitted to the output rotating shaft 19 so as to swing. A front bracket 30 is screwed onto the internal combustion engine 2 by a hexagonal bolt 3, and a ball bearing 31 is fitted onto the peripheral surface of the front end, and a ball bearing 31 is fitted into the inner race (inner ring, not shown) of this ball bearing. The pinion 28 is pivotally supported through a bush 32 so as to slide back and forth. 33 is a thrust washer,
34 is a stopper, and 35 is a ring that engages this stopper in a groove 36 at the front end of the output rotating shaft, and locks the forward protrusion of the overrunning clutch 16.

Next, the operation of the invented device having the above configuration will be explained. An electromagnetic switch (not shown) is energized, the shift lever 21 is rotated, and the portion engaging with the concave groove 22 of the overrunning clutch 16 is pressed forward (to the right in the figure), and the pinion 28 is connected to the ring gear. Let 4 bite. The pinion 28 is moved to a position where it comes into contact with the thrust washer 33, and is sufficiently engaged with the ring gear 4, and the pinion 28 also has a friction reducing function during idling, similar to the conventional device shown in FIG. There is. After the above-mentioned engagement, the armature 18 is energized and energized in the same manner as explained in the conventional device, and rotational force is generated, and this rotational force is transferred to the output rotating shaft 1.
9, helical spline 20, clutch outer 1
7, it is transmitted to the pinion 28 via the roller 25 and clutch inner 24, and the ring gear 4 of the internal combustion engine 2 is urged to rotate (flanking). The meshing reaction force generated in the pinion 28 during rotational biasing is supported by the ball bearing 31 via the bush 32 and transferred to the engine 2 via the front bracket 30.
The pressure is transmitted to and received by the

According to the above, the front shaft bearing part of the starter motor is mounted on a pinion, and the overrunning clutch 16's shiff lever engaging part is arranged on the upper outer circumferential surface of the clutch outer cam, thereby shortening the overall axial length and improving the dustproof function. This has the effect of providing an excellent starting motor.

In the above embodiment, a ball bearing is used as the bearing device that supports the pinion, but the present invention is not limited to this, and other bearing devices such as a needle roller bearing with an inner race or a flat bearing can also be used. good. In addition, the bushing fitted to the inner circumferential surface of the ball bearing does not need to be installed; in this case, if the inner race of the ball bearing is integrally made of oil-impregnated sintered bearing alloy, good sliding function of the pinion 28 can be achieved. Effects obtained with a simple configuration are added.

Furthermore, it goes without saying that the same effect can be obtained even if the starting motor is of another type, such as an internal reduction type starting motor having a built-in reduction gear.

As described above, according to this invention, the outer circumferential surface of the pinion is hardened and polished at the same time as the outer circumferential surface of the clutch inner cam part, the outer circumferential surface of the pinion is supported by a bearing device, such as a ball bearing, and the outer circumferential surface of the overrunning clutch is supported by a bearing device, such as a ball bearing. By providing a shiff lever cam engagement groove on the outer circumferential surface of the cam, it is extremely compact.
A dustproof and waterproof function can be obtained with a simple configuration.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part of a conventional device, and FIG. 2 is a sectional view of a main part of a starter motor according to an embodiment of this invention. 1 and 15...starting motor, 2...internal combustion engine,
4...Ring gear, 5 and 16...Overrunning clutch, 6 and 28...Pinion, 7 and 19...Output rotating shaft, 9 and 21...Shiff lever, 14 and 17...Clutch outer, 22...
Concave groove, 31... Ball bearing. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] In an engine starting device with a protruding output rotating shaft structure, the outer circumferential surface of a precision-machined pinion that protrudes and meshes with the ring gear of the engine is pivotally supported by a ball bearing inner race when stationary, and is identical to the pinion described above. 1. An engine starting device comprising a clutch inner provided with an outer circumferential surface, and a shift lever engagement device disposed on the outer circumferential surface of the clutch outer that urges the clutch inner to rotate in one direction.