JP5491052B2 - Power transmission mechanism - Google Patents

Description

  The present invention relates to a power transmission mechanism that outputs a rotational force input to an input shaft from an output shaft to the outside.

  2. Description of the Related Art Conventionally, a power transmission mechanism that outputs rotational force input to an input shaft from an output shaft to the outside is known. In this type of power transmission mechanism, depending on the application, it is desired that the rotational force input from the input shaft is stable when output from the output shaft to the outside.

  This type of power transmission mechanism mainly uses gears and the like, and is affected by the manufacturing accuracy of the gears and the like. Therefore, even if the rotational force input from the input shaft is constant, the output shaft is externally provided. It was difficult to stabilize the rotational force when outputting. Therefore, a power transmission mechanism for controlling the inter-shaft distance between the rotating shafts of gears has been proposed in order to reduce rotation unevenness, torque unevenness and the like caused by the manufacturing accuracy of gears (see, for example, Patent Document 1).

JP-A-6-124125

  However, in the conventional configuration, even if rotation unevenness, torque unevenness and the like caused by the manufacturing accuracy of gears and the like can be prevented, the influence due to the load applied to the output shaft from the outside cannot be prevented. Devices that operate using the rotational force of the output shaft are connected to the power transmission mechanism, but the load applied to the output shaft varies depending on the operation of these devices, so the rotational force of the output shaft It was difficult to stabilize.

  An object of the present invention is to provide a power transmission mechanism that solves the above-described problems of the prior art and that can stably supply rotational force even when the load applied to the output shaft from the outside fluctuates. is there.

  The present invention provides a power transmission mechanism that outputs a rotational force input to an input shaft from an output shaft to the outside. The input shaft is provided on a crankshaft, and the crankshaft is provided with a flywheel that rotates integrally. A plurality of crank pins arranged along a rotation center, and the output shaft is disposed substantially parallel to the rotation center of the crank shaft and connected to the crank shaft via a plurality of link mechanisms, Each of the link mechanisms includes a first link rotatably attached to the crank pin, one end pivotably attached to the first link, and the other end pivoted to the output shaft via a clutch mechanism. A second link that is freely attached, and the clutch mechanism rotates the output shaft only in one direction by swinging the second link. And wherein the Rukoto.

  According to this configuration, the force applied to the output shaft from the outside hardly affects the crankshaft by the link mechanism as the speed reducer, and the rotational force of the crankshaft is kept substantially constant by the flywheel. For this reason, the power transmission mechanism can stably supply the rotational force even when the load applied to the output shaft from the connected external device fluctuates.

  In this case, the plurality of link mechanisms may alternately rotate the output shaft. Three or more link mechanisms may be provided, and any of the link mechanisms may always rotate the output shaft when the crankshaft rotates. The crankshaft may include a plurality of the flywheels, and both ends of the crankpin may be attached to the adjacent flywheels. The crankshaft may be provided with the crankpin and the flywheel alternately. The second link may be longer than the first link. The crankpin may be arranged so as to overlap with the rotation center of the crankshaft. In the crankshaft, a through hole that penetrates the flywheel and the crank pin is formed at the center of rotation, and a center axis of the through hole may be inserted from one end of the crankshaft to the other end. The clutch mechanism may be a one-way clutch.

  In the present invention, even if the load applied to the output shaft from the outside fluctuates, the rotational force can be stably supplied.

It is a front view which shows the power transmission mechanism which concerns on embodiment of this invention. It is a schematic diagram which shows a link mechanism. It is a perspective view which shows a power transmission mechanism.

  Hereinafter, a power transmission mechanism according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a front view showing a power transmission mechanism in the present embodiment.

  The power transmission mechanism 100 includes a crankshaft 10, four link mechanisms 20, an output shaft 30, and a motor 40 connected to the crankshaft 10. The crankshaft 10, the link mechanism 20, the output shaft 30, and the motor 40 are attached to the housing 50.

  The casing 50 has a pair of opposing side walls 51 and 52 arranged substantially parallel to each other, and penetrates the side walls 51 and 52 in the vertical direction so that the crankshaft 10 and the output shaft 30 are rotatably attached. It has been. In the present embodiment, the crankshaft 10 is disposed at the lower portion of the housing 50 and the output shaft 30 is disposed at the upper portion of the housing 50.

  The motor 40 is attached to a side wall 51, and a pulley 41 is attached to an output end.

  The crankshaft 10 includes an input shaft 11, five flywheels 12, four crankpins 13, and a central shaft 15. The crankshaft 10 is provided with flywheels 12 and crankpins 13 alternately.

  The input shaft 11 is provided at one end of the crankshaft 10 and protrudes to the outside of the side wall 51 to which the pulley 14 is attached. The pulley 14 is engaged with a pulley 41 of the motor 40 and a V-belt 42 so that the rotational force of the motor 40 is transmitted.

  Between the side wall 51 and the side wall 52, five flywheels 12 are arranged substantially at the same interval and coaxially with the input shaft 11. Crank pins 13 are attached between adjacent flywheels 12 so as to be sandwiched therebetween. These crank pins 13 are formed to have a smaller diameter than the flywheel 12. Note that the crankpin 13 in the present embodiment is disposed at a position overlapping the rotation center of the crankshaft 10. The crankshaft 10 is provided so that the flywheel 12 and the crankpin 13 rotate integrally.

  The crankshaft 10 is formed with a through hole 10 a penetrating the input shaft 11, each flywheel 12 and each crankpin 13 from one end protruding from the side wall 51 to the other end protruding from the side wall 52. A center shaft 15 is closely inserted into the through hole 10a from one end of the crankshaft 10 to the other end. Thereby, the crankshaft 10 has high strength in which the flywheel 12 and the crankpin 13 are not easily shaken in the centrifugal force direction. The center shaft 15 may be screwed at both ends of the rank shaft 10.

  Each crankpin 13 has both ends attached to opposing surfaces of adjacent flywheels 12. The respective crank pins 13 are provided at substantially equal distances from the rotation center of the crankshaft 10 and are provided at substantially the same angle around the rotation center. That is, in the crankshaft 10 having the four crankpins 13, the crankshaft 10 is disposed at positions shifted by 90 degrees from the rotation center when viewed from the input shaft 11 side along the rotation center of the crankshaft 10. Yes.

  Each crank pin 13 is disposed so as to overlap the rotation center of the crankshaft 10. Thereby, since the axis of the crankpin 13 rotates in the vicinity of the rotation center of the crankshaft 10, the movement range of the first link 21 when the crankshaft 10 makes one rotation is narrow. Accordingly, the range in which the second link 22 swings around the output shaft 30 is also narrowed. Therefore, since the range in which the second link 22 swings when the crankshaft 10 makes one revolution is narrow, more rotation of the crankshaft 10 is required for the output shaft 30 to make one revolution. Thereby, since the amount of rotation of the output shaft 30 when the link mechanism 20 swings once is small, even if the swing speed of the second link 22 is not completely constant, the influence of fluctuation of the swing speed is small. The rotational speed of the output shaft 30 itself can be kept substantially constant.

  Each of the link mechanisms 20 includes a first link 21, a second link 22, and a one-way clutch (clutch mechanism) 23. The link mechanism 20 connects the crankshaft 10 and the output shaft 30 to transmit the rotational motion of the crankshaft 10 to the output shaft 30.

  One end of the first link 21 is rotatably attached to the crankpin 13 via a ball bearing. The other end of the first link 21 is formed with a through hole penetrating substantially parallel to the rotation center of the crankshaft 10.

  The second link 22 is formed longer than the first link 21. The second link 22 sandwiches the first link 21 at the position of the through hole with a bifurcated portion 22a having one end divided into two. A link shaft 24 passes through the through-hole of the first link, and both ends of the link shaft are attached through the bifurcated portion 22 a of the second link 22. Thereby, the second link 22 is attached to the first link 21 so as to be swingable about the link shaft 24.

  A one-way clutch 23 is integrally attached to the other end of the second link 22. In the present embodiment, each one-way clutch 23 includes a three-row clutch structure along the axis of the output shaft 30. As a result, when the second link swings in one direction around the output shaft 30, the one-way clutch 23 attached to the output shaft 30 is fixed to the output shaft 30 and rotates integrally without shifting the positional relationship. Moving. On the other hand, when the second link swings in the reverse direction, the one-way clutch 23 is released from being fixed to the output shaft 30 and moves separately. That is, the one-way clutch 23 is provided to rotate the output shaft 30 only when the second link swings in one direction, and is provided to rotate the output shaft only in one direction.

  The output shaft 30 is disposed substantially parallel to the rotation center of the crankshaft 10, and a gear 31 is attached to an end portion outside the side wall 52. With this gear 31, the power transmission mechanism 100 is provided so as to output a rotational force to an external device or the like.

  2A to 2D are schematic views showing the operation of the link mechanism.

  For example, when any one of the four link mechanisms 20 is in the state shown in FIG. 2A, the remaining three link mechanisms 20 are respectively shown in FIGS. 2B to 2D. ) In one of the different states. For example, each link mechanism 20 is in the state of FIG. 2A, FIG. 2B, FIG. 2C, and FIG. 2D in order from the input shaft 11 side of the crankshaft 10.

  When the crankshaft 10 rotates in the clockwise direction indicated by the arrow R in the figure, each link mechanism 20 is rotated in order from the input shaft 11 side of the crankshaft 10 when the crankshaft 10 is rotated 90 degrees. (C), FIG. 2 (d), and FIG. 2 (a).

  Further, when the crankshaft 10 is rotated 90 degrees in the direction of the arrow R, each link mechanism 20 is moved in order from the input shaft 11 side of the crankshaft 10 in FIGS. 2 (c), 2 (d), and 2 (a). Then, the state shown in FIG.

  Further, when the crankshaft 10 is rotated 90 degrees in the direction of arrow R, each link mechanism 20 is moved in order from the input shaft 11 side of the crankshaft 10 in FIGS. 2 (d), 2 (a), 2 (b). ), The state shown in FIG. 2 (c), and when rotated 90 degrees, the initial state is restored and the same series of operations are repeated. Through these series of operations, the second link 22 of the link mechanism 20 swings in the direction indicated by the arrow S in the figure with the output shaft 30 as an axis.

  The power transmission mechanism 100 rotates the output shaft 30 in the arrow R direction in the process of shifting from the state of FIG. 2C to the state of FIG. 2A through the state of FIG. That is, each link mechanism 20 rotates the output shaft 30 alternately. Thereby, the power transmission mechanism 100 is in the process of the state of FIG. 2D in which any one of the link mechanisms 20 always rotates the output shaft 30 in the direction of the arrow R when the crankshaft 10 rotates. The torque is always applied to the output shaft 30 to rotate the output shaft 30.

  FIG. 3 is a perspective view showing the power transmission mechanism.

  When the motor 40 rotates in the direction of arrow R in FIG. 3, the rotational force of the motor 40 is transmitted to the input shaft 11 (see FIG. 1) of the crankshaft 10 via the V belt 42 (see FIG. 1).

  When the rotational force is transmitted to the input shaft 11, the crankshaft 10 is rotated in the arrow R direction at a substantially constant rotational speed by the flywheel 12.

  When the crankshaft 10 rotates, the link mechanism 20 causes the second link 22 to swing in the direction indicated by the arrow S, and rotates the output shaft 30 in the direction indicated by the arrow R via the one-way clutch 23. At this time, the link mechanism 20 rotates the rotating shaft 30 by substantially the same angle as the angle at which the second link 22 has moved in the arrow S direction. As a result, the rotational force input from the input shaft 11 is decelerated and transmitted to an external device connected to the gear 31 of the output shaft 30 with a substantially constant rotational force.

  In the present embodiment, in the power transmission mechanism 100, the crankshaft 10 rotates integrally with the flywheel 12 and the crankpin 13, and the first link 21 attached to the crankpin 13 and the second link attached to the first link 21. A plurality of link mechanisms 20 having links 22 sequentially rotate the output shaft 30 little by little via the one-way clutch 23. Thereby, the force applied to the output shaft 30 from the outside hardly affects the crankshaft 10 by the link mechanism 20 as a speed reducer, and the rotational force of the crankshaft 10 is kept substantially constant by the flywheel 12. It is. For this reason, the power transmission mechanism 100 can stably supply the rotational force even when the load applied to the output shaft 30 from the connected external device fluctuates. At this time, the power transmission mechanism 100 is space-saving because it does not need to use a gear having a large diameter to transmit the rotational force from the input shaft 11 to the output shaft 30 while decelerating, and is installed in a narrow place. Is possible.

  Further, since the power transmission mechanism 100 is not easily affected by the force applied to the output shaft 30 from the outside, when the motor 40 is connected to the input shaft 11 of the crankshaft 10, the power transmission mechanism 100 is related to the load applied to the output shaft 30 from the outside. Therefore, the motor 40 can be stably driven at the most efficient rotational speed, and the efficiency of the entire apparatus including the motor 40 can be improved.

  Further, in the power transmission mechanism 100, the four link mechanisms 20 sequentially rotate the output shaft 30, and any one of the link mechanisms 20 always applies torque to the output shaft 30. Thereby, since the power transmission mechanism 100 can always rotate the output shaft 30, even if it is a case where the one-way clutch 23 which produces a backlash is used, an output can be supplied stably.

  As mentioned above, although this invention was demonstrated based on embodiment, this invention is not limited to this. In the above embodiment, the power transmission mechanism 100 includes the four link mechanisms 20, but the present invention is not limited to this. If the structure is such that at least one of the link mechanisms always applies torque to the output shaft, the power transmission mechanism 100 has four. A plurality of link mechanisms other than the above may be provided.

  Moreover, in the said embodiment, although the link mechanism 20 rotates the output shaft 30 with the one-way clutch 23, it is not limited to this, If it is a mechanism which rotates the output shaft 30 only to one direction, other clutches A mechanism may be used.

  Furthermore, in the above-described embodiment, the power transmission mechanism 100 is provided so that the output shaft 30 rotates in the direction of the arrow R, but is not limited to this, and the output shaft rotates in the direction opposite to the direction of the arrow R. It may be provided as follows.

DESCRIPTION OF SYMBOLS 10 Crankshaft 10a Through-hole 11 Input shaft 12 Flywheel 13 Crankpin 14 Pulley 15 Central shaft 20 Link mechanism 21 1st link 22 2nd link 22a Two-forked part 23 One-way clutch (clutch mechanism)
24 Link shaft 30 Output shaft 40 Motor 41 Pulley 42 V-belt 50 Housing 51 Side wall 52 Side wall 100 Power transmission mechanism

Claims (8)

In the power transmission mechanism that outputs the rotational force input to the input shaft from the output shaft to the outside,
The input shaft is provided on a crankshaft;
The crankshaft is provided with a flywheel that rotates integrally, and a plurality of crankpins arranged along the center of rotation.
The output shaft is disposed substantially parallel to the rotation center of the crankshaft and connected to the crankshaft via a plurality of link mechanisms,
Each of the link mechanisms includes a first link rotatably attached to the crank pin, one end pivotably attached to the first link, and the other end pivoted to the output shaft via a clutch mechanism. A second link movably attached;
The clutch mechanism is provided to rotate the output shaft only in one direction by swinging the second link ,
The crankshaft, the flywheel, and the crankpin are all arranged so as to overlap the rotation center,
In the crankshaft, a through hole that penetrates the flywheel and the crank pin is formed in the rotation center, and a central axis is inserted into the through hole from one end to the other end of the crankshaft. Power transmission mechanism. The power transmission mechanism according to claim 1,
The power transmission mechanism, wherein the plurality of link mechanisms rotate the output shaft alternately. The power transmission mechanism according to claim 1 or 2,
A power transmission mechanism comprising three or more link mechanisms, wherein any one of the link mechanisms always rotates the output shaft when the crankshaft rotates. The power transmission mechanism according to any one of claims 1 to 3,
The crankshaft includes a plurality of flywheels, and both ends of the crankpin are attached to adjacent flywheels. In the power transmission mechanism according to any one of claims 1 to 4,
The power transmission mechanism, wherein the crankshaft is provided with the crankpin and the flywheel alternately. The power transmission mechanism according to any one of claims 1 to 5,
The power transmission mechanism, wherein the second link is provided longer than the first link. The power transmission mechanism according to any one of claims 1 to 6,
The power transmission mechanism, wherein the crank pin is disposed so as to overlap with a rotation center of the crank shaft. The power transmission mechanism according to any one of claims 1 to 7 ,
The power transmission mechanism, wherein the clutch mechanism is a one-way clutch.

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