JPH03526Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an internal combustion engine starting device that starts an internal combustion engine using an electric motor as a drive source.

[Prior Art] There is a known internal combustion engine starting device that can replace a recoil starter by adopting a clutch mechanism that has the same structure as a recoil starter that starts the engine by pulling a rope. . According to this type of starter, a manually started internal combustion engine that employs a recoil starter can be easily upgraded to an electric start type.

Fig. 3 shows an exploded perspective view of the main parts of a conventionally known starting device of this type. a cover part 5 attached to close an opening provided in an engine cover 4 attached to cover the end of the output shaft 3 of the engine 2;
and an electric motor 6 attached to the inner central part of the cover part 5. Reference numeral 7 denotes a drive shaft driven by the electric motor 6. In this example, the drive shaft 7 projects along the center line of the starter body 1 toward the output shaft side of the engine. A sun gear 8 is attached to the drive shaft 7,
A ring gear 9 provided so as to concentrically surround the sun gear is fixed to the housing 6a of the electric motor 6 with screws 10. 11 is a clutch plate provided concentrically with the drive shaft 7, and this clutch plate 12 has a hole 1 provided in its center.
The drive shaft 2a is rotatably supported with respect to the drive shaft 7 with the drive shaft 7 fitted therein.

The clutch plate 12 has a pair of planetary gears 13,
13 is supported. These planetary gears are rotatably supported by one ends of a pair of fixed shafts 14, 14 provided through symmetrical positions of the clutch plate, and meshed with the ring gear 9 and the sun gear 8.

As shown in FIG. 4, the drive shaft 7 is rotationally driven in the direction of arrow A by an electric motor when the engine is started.
As a result, the planetary gears 13, 13 rotate in the direction of arrow B and revolve around the sun gear 8 in the direction of arrow C, thereby rotating the clutch plate 12 in the same direction as the rotational direction of the drive shaft 7.

The clutch plate 12 is connected to the fixed shafts 14, 14.
It has fan-shaped recesses 12a, 12a at the positions where the clutch pawl 1 is provided, and the clutch pawl 1 is installed in these recesses, respectively.
5 and 15 are arranged and rotatably supported at the other ends of the fixed shafts 14 and 14.

Reference numeral 16 denotes a hat-shaped clutch cover provided to cover the clutch plate 12, and the clutch cover 16 is rotatable relative to the drive shaft 7 when the drive shaft 7 is fitted into the hole 16a in the center thereof. is supported by A collar portion 16b is provided on the outer periphery of the clutch cover 16, and window portions 16c, 16c are provided at positions corresponding to the claws 15, 15.

A plain spring 17 is attached to the end of the drive shaft 7 protruding through the hole 16a of the clutch cover 16, and an E-ring 18 is fitted into a groove provided around the tip of the drive shaft 7. clutch cover 16
is urged toward the ring gear 9 by the urging force of the plain spring 17, and the flange 16b on the outer periphery of the clutch cover 16 is brought into contact with the end surface of the ring gear 9 while being lightly pressed.

The clutch pawls 15, 15 have the shape shown in FIG. 5, and before starting the engine, as seen in FIG. First positioning contact part 15
a, 15a is one end 16c1 of the window portion 16c, 16c,
It is in the retracted position in contact with 16c2.

When starting the engine, the clutch plate 12 is rotated in the direction of arrow D in FIG.
5 comes into contact with the other end 16c2 of the window portion 16c. In this state, as the clutch plate 12 further rotates, the pawls 15 rotate clockwise in FIG. 5 and are displaced to the clutch engagement position shown in FIG. It protrudes to the outside from 16c. The claw 15 is connected to the other end 16 of the window portion 16
After contacting c2, the clutch cover 16 rotates together with the clutch plate 12.

As shown in FIG. 7, the output shaft 3 of the internal combustion engine 2
The clutch cylinder 21 is attached together with the flywheel 20.
is attached, and the peripheral wall of this clutch cylinder has a large number of clutch pawl engagement holes 21 into which the clutch pawls 15 engage.
a are provided at predetermined intervals in the circumferential direction.

The part of the starter shown in FIG. 3 is attached to the engine by fixing the flange 5a of the cover part 5 of the starter body around the opening 4a provided in the cover 4 of the internal combustion engine with screws, A clutch cover 16 is inserted concentrically inside the clutch tube 21.

When the drive shaft 7 rotates in the direction of arrow A when the engine is started, the clutch plate 12 rotates in the same direction and the clutch pawl 15 protrudes from the window 16c of the clutch cover 16. The clutch pawl engages the clutch pawl engaging hole 21a, and the clutch plate 12 and the clutch cylinder 21 are coupled together. Therefore, the drive shaft 7 is connected to the output shaft 3 of the internal combustion engine, and the output shaft 3 of the engine is driven by the electric motor 6, thereby starting the engine.

[Problems to be solved by the invention] In the conventional internal combustion engine starting device described above, since the ring gear 9 was fixed to the starting device main body 1, the rotation of the planetary gear 13 is uniformly controlled depending on the rotation direction of the electric motor 6. The direction is determined and the clutch plate 12
can only rotate in one direction. Therefore, when the electric motor 6 is stopped after the engine has started,
Clutch plate 12 due to the urging force of the return spring, etc.
It has not been possible to create a structure in which the clutch pawl 15 is rotated in the opposite direction to displace the clutch pawl 15 to the retracted position shown in FIG. Therefore, in the conventional starting device, when the clutch plate 12 stops due to the stop of the electric motor after the engine has started, the clutch pawl 15 is struck by the clutch cylinder 21 rotating together with the engine, and the clutch pawl 15 is moved as shown in FIG. By forcibly rotating it counterclockwise,
The clutch cover 16 was rotated counterclockwise to displace the clutch pawl 15 to the retracted position.

Therefore, there is a problem in that an abnormal noise is generated when the clutch cylinder hits the clutch pawl, and at this time, an impact is applied to the clutch pawl, which causes the pawl to be easily damaged.

Furthermore, in the conventional starting device described above, the high output torque of the electric motor 6 is suddenly applied to the planetary gear 13 at the moment the clutch is engaged, so that the planetary gear is easily damaged.

The purpose of this invention is to prevent the occurrence of abnormal noise and damage to the clutch pawl by quickly displacing the clutch pawl to the retracted position at the time of startup, and to prevent the internal combustion engine from applying a large impact to the planetary gear. An object of the present invention is to provide an engine starting device.

[Means for Solving the Problems] As shown in FIG. 1 showing an embodiment of the invention, the present invention includes an electric motor 6 and a drive shaft 7 driven by the electric motor that protrudes to one side. A starter main body 1, a sun gear 8 attached to a drive shaft 7,
a ring gear 9 provided concentrically surrounding the sun gear 8; a clutch plate 12 provided concentrically with the drive shaft 7 and rotatably supported with respect to the drive shaft; A planet gear 13 is rotatably supported by the ring gear 9 and the sun gear 8, and a clutch cylinder 21 is connected to the crankshaft of the internal combustion engine (see FIG. 7).
The clutch plate 12 is rotatably supported by the clutch plate 12, and when the clutch plate is driven in the engine starting direction by the drive shaft 7 via the planetary gear, the clutch plate is displaced to a connecting position where the clutch plate and the clutch cylinder are connected. In this internal combustion engine starting device, the clutch pawl 15 is provided with a clutch pawl 15 that is retracted from the coupling position when the driving of the electric motor 6 is stopped, and the clutch pawl 15 can be quickly retracted when the electric motor 6 is stopped.

Therefore, in the present invention, the ring gear 9 is supported so as to be rotatable relative to the starter main body 1, and a rotation range regulating means for limiting the rotation range of the ring gear to a certain angle, and a rotation range regulating means that is driven when starting the engine. A return spring is provided that biases the ring gear in a direction opposite to the direction of the driving force transmitted from the shaft to the ring gear 9 via the sun gear 8 and the planetary gears 13.

[Operation of the invention] As described above, the ring gear 9 is made to be able to rotate by a certain angle relative to the starter body 1, and when the engine is started, the ring gear 9 is made to rotate through the sun gear 8 and the planetary gear 13 from the drive shaft. ring gear 9 in the opposite direction to the direction of the driving force transmitted to ring gear 9.
If a return spring is provided to bias the ring gear, when the drive shaft starts rotating when the engine is started, the driving force transmitted from the sun gear to the ring gear through the planetary gear will first resist the biasing force of the ring gear return spring. to rotate in the opposite direction to the drive shaft. After the ring gear, whose rotation range is regulated, rotates by a certain angle and stops, the planetary gear revolves around the sun gear and rotates the clutch plate in the same direction as the drive shaft. This moves the clutch pawl to the coupling position, couples the drive shaft to the output shaft of the internal combustion engine, and starts the engine.
When the electric motor 6 is stopped after the engine has started, the transmission of driving force to the ring gear 9 is cut off, so the ring gear 9, which is biased by the return spring in the opposite rotational direction to the rotation direction at the time of starting, becomes a planetary gear. 13 is rotated in the opposite direction to the starting position and reversed toward the starting position, and the clutch plate 12 is rotated in the opposite direction to the starting position. As a result, the clutch pawl 15
returns to the retracted position, and the connection between the drive shaft 7 and the output shaft of the internal combustion engine is released. Therefore, since the clutch cylinder does not strike the clutch pawl when the engine has been started, it is possible to prevent abnormal noises and damage to the clutch pawl.

Furthermore, when the electric motor starts rotating, the ring gear first rotates by a certain angle against the biasing force of the return spring, so the impact transmitted from the electric motor to the planetary gear can be absorbed by the return spring. It is possible to prevent the planetary gear from being damaged.

[Embodiments] Examples of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows an embodiment of the present invention, in which the same parts as those shown in FIG. 3 are given the same reference numerals. In this example, the third
The difference from the conventional device shown in the figure is that the ring gear 9 is supported so as to be rotatable relative to the starter body 1, and the rotation range of the ring gear 9 is restricted to a certain range. The point that we have established a means,
A return spring 30 is provided which biases the ring gear 9 in a direction opposite to the direction of the driving force acting on the ring gear 9 at the start of startup.

In this embodiment, the housing 6 of the electric motor 6
A guide ring 31 that concentrically surrounds the drive shaft 7 is fixed to the end face of a, and a ring gear 9 is rotatably fitted to the inner periphery of the guide ring 31. The outer periphery of the ring gear 9 is provided with three notched grooves 9a extending in the circumferential direction at angular intervals of 120 degrees, and the guide ring 31 has three notched grooves 9a arranged at 120 degree intervals so as to be located within each notched groove 9a. Spring holding protrusions 32 are provided. A return spring 33 made of a compression spring is provided between one end of the notch groove 9a in the circumferential direction and the spring holding protrusion 32, and this return spring 33 allows the ring gear 9 to control the driving force acting on the ring gear when starting. It is biased in the opposite direction.

Three elongated holes 9b having the same length and extending in the circumferential direction are provided at angular intervals of 120 degrees, passing through the portion of the outer periphery of the ring gear 9 where the notched groove is not provided. The length of each elongated hole 9b is set shorter than the circumferential length of the notched groove 9a, and a stopper pin 34 is fitted into each elongated hole 9b. The stopper pin 34 has a screw 34a at its tip, and this screw is screwed into a screw hole provided in the guide ring 31 and fixed.

In this embodiment, a so-called flat motor having a structure in which a rotor and a stator face each other in a plane is used as the electric motor 6 to generate high output torque without increasing the axial dimension of the starter. .

In this embodiment, the elongated hole 9b and the stopper pin 34 constitute a rotation angle regulating means for regulating the rotation range of the ring gear 9 to a constant angle. Then, the electric motor 6 is stopped and the ring gear 9
When no driving force is applied to the ring gear 9, one end of the elongated hole 9b of the ring gear 9 is held in contact with the stopper pin 34 by the biasing force of the return spring 33, as shown in FIG. In this state, when the electric motor 6 rotates and the drive shaft 7 rotates in the direction of arrow A shown in FIG. , the ring gear 9 rotates in the direction of the arrow E against the urging force of the spring 33. At this time, the impact force acting on the planetary gear 13 is alleviated by the return spring 33.
When the ring gear 9 rotates by a certain angle, the other end of the elongated hole 9b comes into contact with the stopper pin 34, and the ring gear 9
stops. Since the drive shaft 7 continues to rotate,
The planetary gear 13 revolves around the sun gear 8 while rotating in the direction of arrow B, and the clutch plate 12 rotates in the direction of arrow C. As a result, the clutch pawl 15 protrudes from the window 16c of the clutch cover 16 and engages in the clutch pawl insertion hole 21a of the clutch cylinder 21, thereby coupling the drive shaft 7 to the output shaft 3 of the internal combustion engine.
When the electric motor 6 is stopped after the engine has started, the transmission of power to the ring gear 9 is cut off, so the biasing force of the return spring 33 causes the ring gear 9 to move in the opposite direction (in the direction of arrow F) from when the engine started. Rotate. At this time, the planetary gear 13 revolves around the sun gear 8 while rotating in the direction opposite to the direction of arrow B, causing the clutch plate 12 to rotate in the direction opposite to the direction of arrow C. This causes the clutch plate 12 to move to the clutch cover 16.
6, the edge of the window 16c of the clutch cover pushes the clutch pawl 15 inward to return it to the retracted position shown in FIG.

In this way, in the present invention, the clutch pawl 15 can be returned to the retracted position when the electric motor stops, so that the clutch cylinder rotating together with the output shaft of the internal combustion engine hits the clutch pawl 15 and produces abnormal noise. can be prevented from occurring.

In the above embodiment, a flat motor is used as the electric motor 6, but it goes without saying that other motors can be used, and an electric motor with a built-in speed reducer can also be used. Therefore, the drive shaft 7 may be the output shaft of the electric motor itself, or may be a shaft coupled to the output shaft of the electric motor via a speed reducer or the like.

The rotation range regulating means for regulating the rotation range of the ring gear is not limited to the above-mentioned example, and any device may be used as long as it can regulate the rotation range of the ring gear to a certain angle or less.

[Effects of the invention] As described above, according to the invention, the ring gear is provided so that it can rotate by a certain angle relative to the starter body, and the sun gear and planets are removed from the drive shaft when starting the engine. A return spring is provided that biases the ring gear in the opposite direction to the direction of the driving force transmitted to the ring gear via the gear, and when the motor starts rotating, it first resists the biasing force of the return spring. Since the ring gear is rotated by a certain angle, the return spring can absorb the impact transmitted from the electric motor to the planetary gear, and the planetary gear can be prevented from being damaged.

In addition, when the electric motor stops after the engine has started, the clutch plate can be rotated in the opposite direction to when the engine started, and the clutch pawl can be returned to the retracted position. This has the advantage of preventing the clutch pawl from being hit, making abnormal noises, and damaging the clutch pawl.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view showing the main parts of an embodiment of the present invention, Fig. 2 is a top view showing the surrounding area of the ring gear of the same embodiment, and Fig. 3 is an exploded perspective view showing the main parts of a conventional starter device. FIG. 4 is a top view showing the surrounding area of the ring gear of the starter device shown in FIG. 3. Figures 5 and 6 show an example of the configuration of the main parts of the clutch mechanism used in the starting device targeted by the present invention.
FIG. 5 is a top view showing the clutch pawl in the retracted position, and FIG. 6 is a top view showing the clutch pawl in the engaged position. FIG. 7 is a sectional view showing an example of a state in which the starter is attached to an internal combustion engine. 1... Starting device main body, 2... Internal combustion engine, 3...
Output shaft, 4... Cover of the internal combustion engine, 5... Cover part of the starter body, 6... Electric motor, 7... Drive shaft, 8... Sun gear, 9... Ring gear, 9b...
... Long hole, 12 ... Clutch plate, 13 ... Planet gear, 15 ... Clutch pawl, 16 ... Clutch cover, 16c ... Window, 31 ... Guide ring, 32 ... Spring holding protrusion, 33 ... return spring,
34...Stotsupapin.

Claims (1)

[Claims for Utility Model Registration] A starter body including an electric motor and a drive shaft driven by the electric motor protruding to one side, a sun gear attached to the drive shaft, and a surrounding area around the sun gear. a ring gear provided concentrically surrounding the drive shaft; a clutch plate provided concentrically with the drive shaft and rotatably supported with respect to the drive shaft; and a clutch plate rotatably supported with respect to the drive shaft; A planetary gear meshed with a ring gear and a sun gear, a clutch cylinder coupled to a crankshaft of an internal combustion engine, and a clutch plate rotatably supported by the clutch plate, which is driven by the drive shaft through the planetary gear. an internal combustion engine comprising: a clutch pawl that is displaced to a coupling position for coupling the clutch plate and the clutch cylinder when the clutch plate is driven in an engine starting direction; and a clutch pawl that is retracted from the coupling position when the drive of the clutch plate is stopped. In the starter, the ring gear is supported so as to be rotatable relative to the starter body, and includes a rotation range regulating means for limiting the rotation range of the ring gear to a certain angle, and a rotation range regulating means for limiting the rotation range of the ring gear to a certain angle, and a rotation range regulating means for limiting the rotation range of the ring gear to a certain angle, and a rotation range regulating means for limiting the rotation range of the ring gear to a certain angle, and an internal combustion engine starting device, further comprising a return spring that biases the ring gear in a direction opposite to the direction of the driving force transmitted from the sun gear to the ring gear through the sun gear and the planetary gear. .