JPS6331010B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a clutch inner connected to a starting motor and a clutch outer connected to the crankshaft, mounted on the crankshaft of an engine, and a clutch roller interposed between the clutch inner and outer clutch to control the rotation of the starting motor. Sometimes, the clutch roller's wedge action connects the inner and outer clutch to drive the crankshaft by the starter motor, and after the engine has started, the wedge action of the clutch roller is released to cut off power transmission from the crankshaft to the starter motor. This invention relates to an overrunning clutch for starting an engine.

In this type of overrunning clutch, it is necessary to maintain a certain gap between the clutch inner and clutch outer so that they do not rub against each other during engine operation.

The object of the present invention is to provide a clutch that is simple in structure, compact, and easy to assemble, which enables the above-mentioned gap to be provided with high precision. A clutch inner driven by a starter motor is rotatably supported on the cylinder shaft via a bearing, a clutch outer is fitted around the outer periphery of the clutch inner, and a wedge with both ends open is formed on one of the opposing surfaces of the clutch inner and outer. A clutch roller is accommodated in the groove, and the outer end of a cover that covers the outer peripheral surface and one side of the clutch outer is caulked to fix the cover to the clutch outer, and the opening on one end side of the wedge groove is closed by the cover. A flange that closes the opening on the other end side of the wedge groove is integrally provided on the cylindrical shaft, and an outer peripheral portion of the flange is directly fitted into a centering recess formed on the other side of the clutch outer. A constant gap is maintained between the clutch inner and the clutch outer, and the flange and the clutch outer are integrally connected by a bolt that is inserted into the flange from the outside and screwed into the clutch outer. do.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. Reference numeral 1 denotes a crankshaft supported by a crankcase 2 of an engine, and its output torque is transmitted via primary reduction gears 3 and 4 to a speed change input shaft (not shown). The transmission is transmitted to the input member of the clutch 5, which is connected to the cylindrical shaft 6 adjacent to the outside of the gear 3.
is spline-fitted to the end of the crankshaft 1 and secured by bolts 7, and a flange 8 is integrally provided at the outer end of the cylinder shaft 6.

A clutch inner 9 is rotatably supported on the outer periphery of the cylinder shaft 6 via a needle bearing 10, and a driven gear 11 including a gear and a sprocket driven by a starter motor (not shown) is integrally attached to the inner end of the clutch inner 9. It is formed.

Further, between the flange 8 and the driven gear 11, a clutch outer 12 having an inner diameter slightly larger than the outer diameter of the clutch inner 9 is fitted on the outer periphery of the clutch inner 9, and a clutch outer 12 is fitted on the inner circumferential surface of the clutch outer 12 as usual. A clutch roller 14 and a spring 15 for pressing the roller 14 toward the shallow side of the wedge groove 13 are accommodated in the wedge groove 13 .

A circular centering recess 16 is provided on the outer surface of the clutch outer 12, and the outer circumference of the flange 8 is directly fitted into this recess 16 to hold the clutch outer 12 in a concentric position with the clutch inner 9. Clutch inner and outer 9,1
A defined gap 17 is maintained between the two to avoid direct contact between them. The flange 8 and the clutch outer 12 are integrally connected to each other by a bolt 18 that is inserted into the flange 8 from the outside and screwed onto the clutch outer 12.

Further, the outer peripheral surface and inner surface of the clutch outer 12 are covered with a cover 19 made of a steel plate, and this cover 19 is fixed to the clutch outer 12 by caulking its outer end 19a. This cover 19 and the flange 8 close the openings at both ends of the wedge groove 13 and prevent the clutch roller 14 from coming off from the wedge groove 13.

As specifically shown in FIG. 2, a signal projection 20 is formed on the outer peripheral surface of the cover 19 by punching from the inside, and a pick-up coil that cooperates with this signal projection 20 constitutes an ignition pulser 22. A mounting base 21a of 21 is fixed to a proper position of the crankcase 2 with bolts 27. This pick-up coil 21 has a signal protrusion 20 on its front surface.
When crossed, a pulse signal can be generated that drives an ignition circuit (not shown).

The flange 8
The relative positions of the clutch outer 12 and the clutch outer 12 in the circumferential direction are determined by fitting the positioning pins 25 into their positioning holes 23 and 24, and the clutch outer 12 and the cover 19 have a part 19b of the side wall of the cover 19. Bolt hole 2 of clutch outer 12
By caulking to 8, the relative position in the circumferential direction is determined.

When the driven gear 11 is rotated in the normal direction of rotation of the crankshaft 1 by operating a starting motor (not shown) to start the engine, the clutch inner 9 moves the clutch roller 14 to the shallow side of the wedge groove 13. Since it is guided and bitten, the clutch roller 14
exerts a wedge action to connect the clutch inner and outer clutches 9 and 12. Therefore, driven gear 1
The rotational torque of 1 is the clutch inner and outer 9,
12 to the flange 8 and the crankshaft 1, and the engine can be cranked and started.

After starting, the clutch outer 12 that rotates together with the crankshaft 1 moves the clutch roller 14 into the wedge groove 13.
Since the wedge action of the clutch roller 14 is released by guiding the clutch inner and outer 9,
The connection between the 12 will be severed. Therefore, the clutch inner 9 can be stopped simultaneously with the stopping of the starting motor. During this time, the clutch inner and outer clutches 9 and 12 do not rub against each other due to the gap 17, and therefore do not provide any frictional resistance to the rotation of the crankshaft 1.

Further, when the ignition timing arrives as the crankshaft 1 rotates, the signal protrusion 20 that rotates simultaneously with the rotation of the crankshaft 1 crosses the front surface of the pick-up coil 21 to generate a pulse signal from the pick-up coil 21. This drives the ignition circuit and ignites the engine's combustion chamber.

As described above, according to the present invention, the clutch inner 9 driven by the starter motor is mounted on the bearing 1 on the cylindrical shaft 6 fixed to the crankshaft 1 of the engine.
A clutch outer 12 is fitted around the outer periphery of the clutch inner 9, and a clutch roller 14 is accommodated in a wedge groove 13 that is open at both ends and is formed on one of the opposing surfaces of the clutch inner 9 and outer clutch 12. , an outer end 1 of a cover 19 that covers the outer peripheral surface and one side of the clutch outer 12;
9a is caulked to secure the cover 19 to the clutch outer 12, and the opening at one end of the wedge groove 13 is closed by the cover 19, and the opening at the other end of the wedge groove 13 is closed on the cylinder shaft 6. A closing flange 8 is integrally provided, and this flange 8
is directly fitted into a centering recess 16 formed on the other side of the clutch outer 12 to maintain a constant gap 17 between the clutch inner and outer clutch 9, 12, and to maintain a constant gap 17 between the flange 8 and the clutch outer 12. Since they are integrally connected by a bolt 18 that is inserted into the flange 8 from the outside and screwed onto the clutch outer 12, the clutch inner 9 and outer clutch 12, which should be held concentrically with each other, can be held with respect to the common cylinder axis 6. Moreover, the flange 8 of the cylinder shaft 6 and the centering recess 16 of the clutch outer 12 can be directly fitted together without interposing the cover 19 between them. Tsute clutch inner 9 and outer 1
A gap 17 between the clutch inner 9 and the outer clutch 12 can be provided with high accuracy, and the presence of this gap 17 reliably prevents sliding between the clutch inner 9 and the outer clutch 12, which causes a frictional loss of power during engine operation. In addition, it is possible to easily control the accuracy of clutch processing and assembly as a whole, thereby increasing mass productivity.

Further, the flange 8 fitted into the centering recess 16 is embedded in the side surface of the clutch outer 12, so that it does not protrude greatly to the side or radially outward of the outer clutch outer 12. The cylindrical shaft 6 is concentrically fitted with the clutch inner 9 and does not protrude much to the side of the inner 9. As a result, the clutch can be made more compact in both the axial and radial directions. . Furthermore, since the flange 8 plays two roles: centering the clutch outer 12 and preventing the clutch roller 14 from slipping out, the structure can also be simplified.

Furthermore, in assembling, the clutch outer 12 with the cover 19 attached in advance and the clutch inner 9 are fitted concentrically to each other, and the clutch roller 14 is inserted between the fitting surfaces, and then the centering recess of the clutch outer 12 is fitted. 16 and the outer periphery of the flange 8, and then tighten the bolt 18 between both 12 and 8 from the outside of the flange 8. Therefore, the tightening operation of the bolt 18 is not hindered by the clutch inner 9 or the cover 19. and the cover 19 can be attached by simple caulking without using special fixing tools such as bolts.
2. The inner 9, roller 14, and cover 19 can be assembled together as a clutch assembly in advance on a separate assembly line, and the main assembly of the assembly involves connecting the cylindrical shaft 6 to the crankshaft 1. Coupled with the fact that it is only necessary to fasten, it can greatly contribute to improving the efficiency of the assembly work as a whole. In addition, the cover 19
Even if the cover 19 is fixed to the clutch outer 12 by caulking, the clutch roller 14
Since only the lateral pressure associated with sideways slipping of the clutch roller 14 is applied, the clutch roller 14 is securely fixed to the clutch outer 12 and the clutch roller 14 can be accurately held at the normal set position at all times.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of the device of the present invention, and FIG. 2 is a perspective view of the vicinity of the signal protrusion therein. 1... Crankshaft, 6... Cylindrical shaft, 8... Flange, 9... Clutch inner, 10... Bearing, 12... Clutch outer, 13... Wedge groove, 1
4...Clutch roller, 16...Centering recess, 1
7... Gap, 19... Cover, 19a... Outer end.

Claims (1)

[Claims] 1 Cylindrical shaft 6 fixed to the engine crankshaft 1
A clutch inner 9 driven by a starting motor is rotatably supported via a bearing 10, a clutch outer 12 is fitted around the outer periphery of the clutch inner 9, and a clutch outer 12 is formed on one of opposing surfaces of the clutch inner 9 and outer clutch 12. A clutch roller 14 is housed in a wedge groove 13 that is open at both ends, and the outer end 19a of a cover 19 that covers the outer peripheral surface and one side of the clutch outer 12 is caulked to fix the cover 19 to the clutch outer 12. The opening at one end of the wedge groove 13 is closed by the cover 19, and the cylindrical shaft 6 is integrally provided with a flange 8 that closes the opening at the other end of the wedge groove 13. is directly fitted into a centering recess 16 formed on the other side of the clutch outer 12 to maintain a constant gap 17 between the clutch inner and outer clutch 9, 12, and to maintain a constant gap 17 between the flange 8 and the clutch outer 12. 8
An overrunning clutch for starting an engine, which is integrally connected by a bolt 18 that is inserted from the outside and screwed onto a clutch outer 12.