JPS609467Y2 - One-way rotation transmission device - Google Patents

Description

[Detailed description of the invention] This invention relates to a unidirectional rotation transmission device with a simple structure suitable for manual power generating lamp devices, etc., which allows the driven shaft to be driven at a constant speed without being affected by an unreasonable increase in the rotational speed of the driving shaft. It is an object of the present invention to provide a one-way rotation transmission device that can be rotated and suppresses unpleasant operation noise of a clutch pawl.

As a conventional rotation transmission device of this kind, as shown in FIG. 3, the flywheel 42 provided on the driven shaft 41 side is constituted by an inner ratchet wheel, and a plurality of clutch pawls 43 that engage and disengage from the inner ratchet wheel 42 are arranged as follows. The driven shaft 41 is held by a rotating body 45 provided on the side of the driving shaft 44 that rotates in both directions (arrows a and b), and rotates the driving shaft 44 in only one direction (for example, in the direction of arrow a).
There is one that is set to transmit to the side.

With this structure, the clutch pawl 43 held on the driving shaft 44 side remains locked to the inner ratchet wheel 42 during the rotation period of the driving shaft 44 in one direction, so that the driving shaft 44 is When the shaft rotates at high speed, the driven shaft 41 also rotates at an abnormally high speed.

If this is used in a device such as a manual power generation lamp device in which the rotation of the driven shaft 41 must be restricted so that it does not exceed a predetermined value, damage to the load such as bulb breakage is likely to occur.

Further, since the clutch pawl 43 is provided on the drive shaft 44 side, the drive shaft 44 is rotated while the driven shaft 41 is rotating in the direction of arrow a.
When the clutch rotates in the opposite direction (in the direction indicated by the arrow), an unpleasant tapping sound is always generated by the clutch pawl 43 and the inner ratchet wheel 42.

This invention eliminates the above-mentioned drawbacks, and examples thereof will be described below with reference to FIGS. 1 to 3.

In FIG. 1, 1 is a driving shaft that alternately rotates in both directions (directions of arrows a and b), and 2 is a driven shaft, both of which are horizontal shafts.

Reference numeral 3 indicates a vertically rotating rattle wheel provided on the driving shaft 1, and 4 indicates a tray-shaped vertically rotatable flywheel provided on the driven shaft 2. The rattle wheel 3 is set coaxially within a recess 4a of the flywheel 4. ing.

5, 5□, 5°, and 53 are a plurality of clutch pawls equally spaced in the circumferential direction of the recess 4a of the flywheel 4, and pins 6, 6, which are protruded from the recess 4a of the flywheel 4, respectively. ,
It is freely pivoted at 6° and 63.

When the driving shaft 1 rotates in one direction (the direction of arrow a in this embodiment), at least one clutch pawl 5 rotates downward under its own weight to a predetermined rotational speed of the driven shaft 2 and is locked to the ratchet wheel 3. The rotation is transmitted to the driven shaft 2 side, and each clutch pawl 5 is set so as to be released from the ratchet wheel 3 by centrifugal force when the driven shaft 2 reaches a predetermined rotational speed. It is.

? , 7. , ? □, 73 are notches for allowing each clutch pawl 5 to escape outward.

The operation of the above structure will be explained using an example of use in a manual lamp device shown in FIG.

In the figure, for example, gears 21, 22, 23 and a pinion 24 are provided on the driving shaft 1 side of the unidirectional rotation transmission device 20.
A manual operating rod 27 to which the tensile force of a return spring 26 is applied is connected via a rack 25, and a driven shaft 2 of the lamp 28 on the generator 29 side is connected.

In other words, when the driving shaft 1 is rotated in the direction of arrow a by pressing the manual operating rod 27 in the direction of arrow C, at least one of the clutch pawls 5, which has rotated downward under its own weight, is engaged with the ratchet wheel 3. Along with the flywheel 4, the driving shaft 1 is connected to the driven shaft 2.
Rotation in the same direction is transmitted, thereby generating power for lighting the lamp 28.

During the return stroke of the manual operating rod 27 in the direction of arrow d, the clutch pawl 5 slides against the ratchet wheel 3, so even if the driving shaft 1 rotates in the direction indicated by the arrow, the rotation is not transmitted to the driven shaft 2. The rotation is interrupted, and the driven shaft 2 continues to rotate in the direction of arrow a by the flywheel 4 (see FIG. 2B).

Here, when the rotational speed of the drive shaft 1 side increases and the rotation of the flywheel 4 becomes high speed, the clutch pawl 5 moves radially outward as shown by the dashed line in Fig. 2A due to centrifugal force. Since the driven shaft 1 is rotated and released from the ratchet wheel 3, the rotational speed of the driven shaft 1 can be maintained at a substantially constant speed, and therefore damage to the load can be effectively prevented.

Further, if the flywheel 4 is rotating at high speed, even if the driving shaft 1 is reversed in the direction indicated by the arrow, there is no slippage between the clutch pawls 5 and the ratchet wheel 3, so that no unpleasant knocking noise is generated.

As described above, when the driving shaft 1, which rotates in both directions, rotates in one direction, the plurality of clutch pawls 5, which are engaged with the vertically rotating ratchet wheel 3 provided on the driving shaft 1 side, are moved to the driven shaft 2 side. A vertically rotatable flywheel 4 is rotatably supported along the circumferential direction on the inner surface thereof, and when the driven shaft 2 reaches a predetermined rotational speed, the clutch pawl 5 is connected to the driven shaft. According to this invention, the weight body is separated from the ratchet wheel 3 by the centrifugal force caused by the rotation of the drive shaft 1, and the rotational speed of the driving shaft 1 increases, causing the rotation of the flywheel 4 provided on the driven shaft 2. When the speed increases, centrifugal force acts on the clutch pawl 5 rotatably supported on the flywheel 4, and the clutch pawl 5 becomes disengaged from the flywheel 4 due to its own weight, cutting off the transmission of driving force and turning the clutch pawl 5 off the flywheel 4. The rotational speed on the shaft 2 side is maintained at a constant speed to prevent the light bulb, which is a load, from burning out.

Further, according to this invention, the clutch pawl 5 is freely rotatably supported on the flywheel 4 provided on the driven shaft 2 side, and is released from the ratchet wheel 3 by the centrifugal force caused by the rotation of the driven shaft 2. Since it is composed of a heavy body that can be easily assembled, it engages and disengages from the ratchet wheel 3 by its own weight, so it is suitable for devices where the driving shaft 1 is repeatedly rotated forward and reverse, such as a manual ramp device. , has good followability and no failures.

In addition, when the driving shaft rotates in the opposite direction, at least one of the plurality of clutch pawls becomes detached from the flywheel 4 due to its own weight. If the driving shaft is rotated in the opposite direction during the high-speed rotation in step 4, it is possible to prevent the generation of the knocking noise.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view showing an example of the one-way rotation transmission device according to this invention, Fig. 2 A and B are explanatory views of the operation in an example of the use of the same device, and Fig. 3 is an exploded perspective view showing a conventional device. It is. 1... Driving axis, 2... Driven axis, 3...
...Pawl wheel, 4...Handwheel, 5...
...Clutch pawl.

Claims (1)

[Scope of utility model registration request] When the driving shaft 1, which rotates in both directions, rotates in one direction, a plurality of clutch pawls 5 are engaged with a vertically rotating ratchet wheel 3 provided on the driving shaft 1 side, and a vertically rotating ratchet wheel 3 provided on the driven shaft 2 side The flywheel 4 is rotatably supported on the inner surface of the flywheel 4 in a free manner along the circumferential direction, and when the driven shaft 2 reaches a predetermined rotational speed, the clutch pawl 5 is rotated centrifugally by the rotation of the driven shaft 2. A one-way rotation transmission device consisting of a heavy body that is released from the ratchet wheel 3 by force.