JP2693104B2 - Auxiliary engine device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driven device which is driven mainly by human power, such as a bicycle, a thresher, a powder mill, a moving vehicle for a physically handicapped person, for driving an engine under heavy load or long working hours. The present invention relates to an auxiliary engine device for manually driving a driven device that is switched to reduce labor or is mainly driven by an engine when a failure occurs in an engine system path.

[0002]

2. Description of the Related Art Conventionally, in this type of auxiliary engine device,
A power drive system that drives the driven device via a centrifugal clutch and a reduction gear from the drive shaft of the engine, and a human drive system that drives the driven device by human power are provided. A centrifugal clutch 1 and a manual clutch 3 as shown in FIG. 11 were provided. That is, when the shoe 7 mounted on the drive shaft 5 of the engine is at a predetermined rotation speed or more, the centrifugal clutch 1 is pressed against the drum 11 near the outer periphery against the spring 9 and is formed on the boss portion of the drum 11. Power is transmitted from the small gear 13 to a reduction gear (not shown). The manual clutch 3 is configured as follows. An annular friction plate 1 is provided on an outer surface of a disk 14 fixed to the drive shaft 5.
5 is fixed, and a circular pressing plate 17 is provided outside the operating shaft 19.
Is rotated so as to press against the friction plate 15. The pressing plate 17 has a projection 18 formed on the outer periphery thereof, which is locked in a notch groove 20 in the axial direction of the drum 11.
It is provided to rotate with. Pressing plate 17
When a lever (not shown) provided at an appropriate position is gripped, the friction plate 15 is pressed to connect the transmission between the drive shaft 5 and the small gear 13, and when the hand is released, the pressing plate is pressed by a spring (not shown). 17
Is separated from the friction plate 15 and the transmission is cut off. In addition, a one-way clutch is provided in the manual drive train.

According to the conventional configuration, the driven device is mainly driven manually, but is driven by the power of the engine as needed. At the time of starting the engine, when the manual clutch 3 is connected by gripping the lever and the driven device is driven by operating the human-powered driving path, the engine rotates together with the engine and starts. When the lever is released after the engine starts, the manual clutch 3 is disengaged, and the centrifugal clutch 1 is disengaged when the engine is idling. When the throttle is operated to increase the rotational speed, the centrifugal clutch 1 is connected and the driven device is driven by the engine. In this state, the human-powered driving system path is free by the one-way clutch and is stationary.

[0004]

Many of the devices for switching between manpower driving and power driving use a sprocket and a chain in a drive system path from a driven shaft to a driving device, and a manpower driving device. Since there are many configurations in which a power drive is added, it is difficult to set the load applied to the driven device, a sudden load or an overload is likely to occur, and there is a risk of damage to the chain, engine, and reduction gear.

[0005]

According to the present invention, an engine 21 is provided.
A power drive system path for transmitting power from the drive shaft 27 to the driven device via the reduction gear 67 and the driven shaft 71, and a human power drive system path for driving the driven device by human power are provided. A shock absorber 100 for absorbing impact rotational force is provided in the system path, and the shock absorber 100 includes a plurality of recesses 1 in a plate 101 fixed to the driven shaft 71.
No. 03 is formed and is fitted in the recess 103.
6 is supported by a drive sprocket 107 rotatably adjacent to the plate 101.

[0006]

When the driven device is driven by the engine, a sudden overload is generated in the driven device, or the shock is buffered by the shock absorber when the engine is rapidly accelerated or decelerated. Therefore, the engine, chain, speed reducer, etc. are not damaged.

[0007]

An embodiment of the present invention will be described below with reference to the drawings. 1 to 7, first, a power drive path for driving a driven device (a bicycle in this embodiment) by an engine will be described. A drive shaft 27 at one end of a crankshaft 25 protrudes from a crankcase 23 of the engine 21, and a centrifugal clutch 29 is mounted on an end of the drive shaft 27.
When the rotation speed of the gear 7 becomes equal to or higher than the predetermined rotation speed, the shoe 33 is pressed against the drum 35 by the centrifugal force against the spring 31, and the gear 37 formed on the boss united with the drum 35 is rotated. One-way clutch 3 is provided between drive shaft 27 and gear 37.
9, the roller 41 is sandwiched between the inclined surface 43, the drive shaft 27 and the surface in the relative rotation direction shown by the arrow in FIG. Becomes

The cylinder 45 of the engine 21 is equipped with a decompression device 49 for releasing the pressure of the internal combustion chamber 47 at the time of starting. The decompression device 49 includes a spring 51
The valve 53 in the open state is closed by the explosion pressure against the spring 51 when the engine 21 starts and ignites, but the pressure in the combustion chamber 47 is released from the discharge port 55 until the ignition is performed during the starting operation. Therefore, the rotation for starting is reduced. Note that a damper device 56 is provided at the opposite end of the valve 53 to keep the valve 53 in a decompressable state when the engine is stopped.

The gear 37 passes through a reduction gear 67 which is reduced by a large gear 57, a small gear 59, a large gear 61, a small gear 63, and a large gear 65, and a cylindrical driven shaft 71 supported by a reduction case 69. It is transmitted to. Large gear 65 and driven shaft 71
A clutch device 73 is provided between the two. That is, the clutch cylinder 77 that is fitted to the spline 75 on the outer periphery of the driven shaft 71 and is slidable in the axial direction is
The large gear 65 rotatably fitted to the driven shaft 71 is removably engaged with a pawl clutch 81. The clutch cylinder 77 has a swing arm 85 fixed to a rotatable operating shaft 83.
To connect and disconnect the rotational force between the large gear 65 and the driven shaft 71 in accordance with the rotation of the operation shaft 83.
An arm 87 is fixedly attached to the outer end of the operating shaft 83.
Is pressed against a spring 79 by an adjusting bolt 91 at the tip of a rod 89 which is slidably fitted in the reduction case 69 in the axial direction. A knob 93 is fixed to the outer end of the rod 89, and by rotating the knob 93 by pressing the knob 93, locking pins 95 fixed to the rod 89 are provided on the deceleration case 69 in mutually perpendicular grooves having different depths. The engagement between the clutch cylinder 77 and the large gear 65 is locked by engagement with the gears 97 and 99.

A shock absorber 100 is provided in the power drive system path. That is, a plurality of recesses 103 are formed in the plate 101 fixed to one end of the driven shaft 71, and a cylindrical rubber (buffer body) 106 having a hexagonal nut or a cylindrical nut 105 baked in the center is formed in the recess 103. It is fitted and fixed to the side surface of the drive sprocket 107 by a bolt 109. The drive sprocket 107 is attached to a driven sprocket (not shown) that is fixed to the rear wheel of the bicycle.
Drive through 11. When the driving sprocket 107 receives a sudden acceleration / deceleration of the engine or an impact due to an overload of the driven device, the speed reduction device 69 and the engine 21 are not buffered by the shock absorber 106, and the human power drive path is It is configured like. That is,
A human-powered drive shaft (a pedal shaft in this embodiment) 113 is rotatably fitted in the inner diameter of the driven shaft 71, and the one-way clutch 1
It is connected to the drive sprocket 107 via 15, and the foot pedal arms 116 are fixed to both ends. The one-way clutch 115 is a commonly used one-way clutch such as a ratchet system, and a detailed description thereof is omitted here.

[0011] To travel by human power, the clutch device 73 is disconnected and the human-powered drive shaft 1 is driven by a foot pedal.
When driven, the driven device (in this embodiment, the rear wheel of the bicycle) rotates through the one-way clutch 115, the driving sprocket 107, and the chain 111. In this state, traveling is easy because no rotational force is transmitted to the reduction gear 67 and the engine 21.

In order to drive the rear wheels with the power of the engine 21, when the foot pedal (not shown) is driven with the clutch device 73 connected, the one-way clutch 115 is driven.
The drive sprocket 107 is rotated via the
7 and transmitted from the gear 37 to the drive shaft 27 via the one-way clutch 39, and the engine 21 rotates and starts. When the foot pedal is stopped and the engine is running in an idle state, the centrifugal clutch 29 and the one-way clutch 3
9 are both shut off and in a free state, so that power is not transmitted to the speed reducer 67. When the rotational speed of the engine is increased by operating the throttle valve, the centrifugal clutch 29 is connected, and the speed reducer 67, the clutch device 73, the driven shaft 7
1, shock absorber 106, drive sprocket 107, chain 1
The driven body (rear wheel) is driven via 11.

FIGS. 8 to 10 show another embodiment 73 'of the clutch device 73, in which a large intermediate gear 61 is rotatably fitted to a cylindrical intermediate shaft 117 having a small gear 63 formed on the outer periphery. A plurality of grooves 1 in the axial direction of the inner diameter of the large gear 61
At 19, it is fitted into a radial engaging hole 121 of the intermediate shaft 117, and is engaged with a spherical engaging body 123 which can be freely protruded and retracted on the outer peripheral surface. The locking body 123 engages with two circumferential grooves 127 and 129 having different depths on the outer periphery of the operating shaft 125 which is slidably fitted in the axial direction on the inner diameter portion of the intermediate shaft 117, and 117 and the large gear 65 are connected and disconnected to lock the state. The operating shaft 125 comes into contact with a cam 133 fixed to an operating shaft 131 rotatably supported by the deceleration case 69, and the operating shaft 131 is turned by turning a knob 135 at the end to thereby turn the operating shaft 125 into a spring 137. Slide against The operating shaft 131 holds the knob 135 and
When the knob 135 is pulled out and rotated against a predetermined position, and the hand is released at a predetermined position, the knob 135
It locks the rotation position of the cam 133 by locking with the No. 1 and holds the connection / disconnection position of the clutch device 73 '.

[0014]

According to the present invention, in a device that drives by switching between human power drive and power drive, a sudden overload occurs in a driven device or a shock is applied by a shock absorber when the engine is rapidly accelerated or decelerated. It is possible to prevent damage to devices on the drive system path such as the engine, the chain, and the speed reducer by buffering.

Further, since the shock absorber is fitted in the recess,
It prevents damage and dropout of the shock absorber, has a simple structure, and has a large shock absorbing capacity.

[Brief description of the drawings]

FIG. 1 is a plan sectional view of one embodiment of the present invention.

FIG. 2 is a side sectional view of the same.

FIG. 3 is a side sectional view of a one-way clutch.

FIG. 4 is a side sectional view of the decomp.

FIG. 5 is a front sectional view of an operation portion of the clutch device.

FIG. 6 is a plan sectional view of the shock absorber.

FIG. 7 is a side view of the main part.

FIG. 8 is a plan sectional view of another embodiment of the clutch device.

FIG. 9 is a front sectional view of the cam.

FIG. 10 is a side sectional view showing the vicinity of the locking body.

FIG. 11 is a plan sectional view showing the vicinity of a conventional centrifugal clutch.

[Explanation of symbols]

 21 engine 27 drive shaft 67 speed reducer 71 driven shaft 100 shock absorber

Claims (1)

(57) [Claims] 1. A power drive system path for transmitting power from a drive shaft 27 of an engine 21 to a driven device via a reduction gear 67 and a driven shaft 71, and a human power drive system path for driving the driven device by human power. And a shock absorber 100 for absorbing impact rotational force in the power drive system. This shock absorber 100 has a plurality of recesses 103 formed in a plate 101 fixed to the driven shaft 71. , The recess 1
The buffer body 106 fitted inside the plate 101
An auxiliary engine device configured to be supported by a drive sprocket 107 that is rotatably adjacent to the drive sprocket 107.