JPS6125334Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to an engine starting device using a starting motor. By configuring the driven side element and the driving side element of the one-way clutch interposed between the output member connected to the rotor shaft of the motor and the crankshaft to be separable in the axial direction of the crankshaft. It is an object of the present invention to provide a starter device which has a simple and compact structure and which can be assembled to an engine extremely quickly and easily.

Hereinafter, a case in which the present invention is applied to a motorcycle engine will be explained with reference to the drawings. Reference numeral 1 denotes a crankcase, and a rotor 3a of a magnet generator 3 is attached to the outer end of a crankshaft 2 supported by the crankcase. A bottomed cylindrical side cover 4 covering the generator 3 is joined to the side end of the crankcase 1 and detachably fixed with bolts (not shown). A starting motor 5 is attached to the inner wall of the side cover 4 as follows.

That is, the starting motor 5 is connected to the stator 6 as is known in the art.
The stator 6 is fitted into the side cover 4 together with the left bearing bracket 8 and fixed to the end wall of the side cover 4 with mounting bolts 9. The end wall of the side cover 4 is formed with a right bearing bracket 8' that is paired with a left bearing bracket 8, and a rotor shaft 7a is supported on bearing bushes 10, 10' provided on both brackets 8, 8'. Thus, the rotor shaft 7a is arranged coaxially with the crankshaft 2. Note that 11 is a commutator provided on the rotor 7, 12 is a brush, and 13 is a brush holder attached to the right bearing bracket 8'.

The starting motor 5 is equipped with a planetary gear reducer 14 as follows. That is, the reducer 14 includes a sun gear 15 formed at the end of the rotor shaft 7a, an internal gear 16 concentrically surrounding the sun gear 15, and a plurality of planetary gears 17 (one of which is shown in the figure) that meshes with them. ), and the internal gear 16 is fixed inside a cover 18 which is fixed to the left bearing bracket 8 with mounting bolts 9. Further, a ball bearing 19 is housed in the cover 18, and an output member 2 through which a support shaft 20 of the planetary gear 17 is supported.
Support 1.

A reduction gear 1 is provided between the reduction gear 14 and the crankshaft 2.
A one-way clutch 22 is interposed that can transmit power in one direction from the crankshaft 2 to the crankshaft 2. The clutch 22 includes a pair of leading type clutches 23, 23 which are pivotally supported on the output member 21 with a support shaft 20 so as to be swingable in the radial direction, and a pair of leading type clutches 23, 23 which are fixed to the side surface of the rotor 3a of the generator 3 and surround the clutches 23, 23. between the pair of clutches 23, 23,
That is, return springs 25, 25 are tensioned so as to bias the clutch drum 24 in a direction away from its inner surface.

The one-way clutch 22 is configured to be separable in the axial direction of the crankshaft 2 into a clutch drum 24 as a driven element, and clutches 23, 23 and return springs 25, 25 as driving elements. According to this configuration,
The starting motor 5 and reducer 14 are installed in the side cover 4 in advance.
By simply attaching the side cover 4 to the crankcase 1, the starting motor 5 etc. can be set in the fixed position, and a one-way clutch 22 can be formed between the motor 5 and the crankshaft 2. , can be equipped.

Next, the operation of this embodiment will be explained. When the starting motor 5 is operated to start the engine, the rotor shaft 7a connects the output member 21 to the clutch shaft 23 via the sun gear 15, the planetary gears 17, and their support shafts 20. , 23 are decelerated in the direction of arrow R in FIG. When the clutches 23, 23 are both of the leading type, they produce a self-locking effect and are firmly connected to the clutch drum 24, so that the rotational force of the output member 21 is transmitted to the crankshaft 2 and cranking is performed. and the engine starts.

After starting the engine, if the starting motor 5 is deactivated, the clutches 23, 23 will no longer have a self-locking effect on the clutch drum 24, and will be pulled back to their original inward position by the tensile force of the return springs 25, 25. The connection with 24 is broken.

As described above, according to the present invention, the starting motor 5 is configured inside the bottomed cylindrical side cover 4 fixed to the side end of the crankcase 1 facing the end of the crankshaft 2, and the starting motor 5 rotates. Since the one-way clutch 22 is interposed between the output member 21 connected to the child shaft 7a and the crankshaft 2, it is possible to arrange the starter motor 5 coaxially with the crankshaft 2, which makes it possible to downsize the entire engine, and to reduce the size of the engine as a whole. In the device, intermediate transmission members such as a pinion, a ring gear, and a chain, which were provided between the starting motor and the crankshaft, are no longer necessary, and the structure is simplified, and the starting device can be provided at a low cost. Furthermore, since the side cover 4 also serves as a cover for the starter, the structure becomes simpler and the starter can be ensured to be dustproof and waterproof.

In particular, since the starting motor 5 is mounted on the inner wall of the side cover 4, and the driven side element and the drive side element of the one-way clutch 22 are configured to be separable in the axial direction of the crankshaft 2, the side cover 4 to the crankcase 1, the starting motor 5 can be set at a fixed position in the engine, and a one-way clutch 22 can be constructed between the starting motor 5 and the crankshaft 2, that is, the side cover 4 At the same time as the starting device is attached to the crankcase 1, the starting device can be assembled to the engine very simply, quickly and accurately, which can significantly contribute to improving the efficiency of engine assembly work. Moreover, the starting motor 5 can be easily removed from the engine by simply removing the side cover 4 from the crankcase 1, which is convenient when inspecting and maintaining the starting motor 5. Moreover, there is no need to provide a special means for attaching and detaching the stator 6 of the starting motor 5 to the crankcase 1 and a means for detaching and attaching the output member 21 connected to the rotor shaft 7a to the crankshaft 2. The overall structure is simple and costs can be significantly reduced.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional plan view of a part of a motorcycle engine equipped with the device of the present invention, and FIG. 2 is a sectional view thereof taken along the line -2. 1...Crank case, 2...Crankshaft, 4
...Side cover, 5...Starting motor, 7a... Its rotating shaft, 21... Output member, 22... One-way clutch, 23, 25... Clutch shoe as drive side element, return spring, 24... Clutch drum as a driven element.

Claims (1)

[Scope of claim for utility model registration] Crank case 1 facing the end of the crankshaft 2
A starting motor 5 is attached to the inner wall of the side lid 4 which is a bottomed cylindrical shape fixed to the side end, and a motor is inserted between the output member 21 connected to the rotor shaft 7a of the starting motor 5 and the crankshaft 2 from the output member 21. crankshaft 2
A one-way clutch 22 that can transmit power in one direction is interposed, and this one-way clutch 22 is connected to a driving side element connected to the output member 21 and a driven side element connected to the crankshaft 2. An engine starting device configured to be separable in the axial direction. In the engine starting device as set forth in claim 1 of the utility model registration claim, the one-way clutch 2
The driven side element of the one-way clutch 22 is composed of a clutch drum 24 fixed to the end of the crankshaft 2, and the drive side element of the one-way clutch 22 is surrounded by the clutch drum 24 and is connected to the output member 2.
1. An engine starting device comprising a centrifugal clutch 23 which is pivotally supported in a radial direction by a centrifugal clutch 23 and is biased away from the clutch drum 24 by a return spring 25.