Power conversion device

Abstract

To improve power conversion efficiency and to increase drive force.SOLUTION: A power conversion device 10 comprises a first mechanism performing linear reciprocating motion and a second mechanism performing revolving motion. The first mechanism transmits drive force generated through the linear reciprocating motion to the second mechanism. The second mechanism converts the drive force transmitted from the first mechanism to rotative drive force. The first mechanism includes first reciprocating motion members 3L and 3R which perform reciprocating motion in directions opposite to each other and a second reciprocating motion member 6 which rotates a first rotative member 11 of the second mechanism through the linear reciprocating motion of the first reciprocating motion members in the directions opposite to each other. The second mechanism includes a plurality of second rotative members 11 to 14 and 18 which convert the drive force, transmitted from the first mechanism to the first rotative member in the directions opposite to each other, to rotative drive force in a single direction.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a power conversion device that converts linear reciprocating motion into rotational motion. [Background technology]

[0002] Patent Document 1 describes a device that converts the linear reciprocating motion of a pedal into a rotary motion. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6577600 Summary of the Invention [Problem to be solved by the invention]

[0004] Conventional device structures have room for improvement in terms of reducing mechanical loss when converting linear reciprocating motion into rotational motion, improving conversion efficiency, and making the device smaller and lighter by reducing the number of parts.

[0005] The present invention provides a power conversion device that solves these problems. [Means for solving the problem]

[0006] In order to solve the above problems and achieve the object, the present invention provides a power conversion device that converts linear reciprocating motion into rotational motion, comprising a first mechanism that performs linear reciprocating motion and a second mechanism that performs rotational motion, wherein the first mechanism transmits a driving force generated by the linear reciprocating motion to the second mechanism, and the second mechanism converts the driving force transmitted from the first mechanism into a rotational driving force, the first mechanism includes a first reciprocating member that reciprocates in directions opposite to each other and a second reciprocating member that rotates a first rotating member of the second mechanism by the opposing linear reciprocating motion of the first reciprocating member, and the second mechanism includes a plurality of second rotating members that convert the opposing driving forces transmitted from the first mechanism to the first rotating members into a driving force that rotates in one direction. Effect of the Invention

[0007] According to the present invention, by changing the driving method from the conventional rotary motion to a linear reciprocating motion, it is possible to improve the power conversion efficiency and increase the driving force. [Brief description of the drawings]

[0008] [Figure 1] 1A is a right side view of a vehicle on which the power conversion device of the present embodiment is mounted, and FIG. 1B is a view showing a linear reciprocating mechanism. [Diagram 2] 2A is a side cross-sectional view of the power conversion device of the first embodiment as viewed from the right side of the vehicle, and FIG. 2B is a cross-sectional view taken along line ii of FIG. 2A. [Diagram 3] FIG. 2 is a diagram illustrating the power conversion efficiency of the first embodiment. [Figure 4] FIG. 2 is a diagram illustrating the power conversion efficiency of the first embodiment. [Diagram 5] 1A is a side cross-sectional view of a power conversion device of a second embodiment as viewed from the right side of a vehicle, and FIG. 1B is a cross-sectional view taken along the line ii-ii of FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, the embodiments will be described in detail with reference to the accompanying drawings. Note that the following embodiments do not limit the invention according to the claims, and not all combinations of features described in the embodiments are essential to the invention. Two or more features among the multiple features described in the embodiments may be arbitrarily combined. Also, the same reference numbers are used for the same or similar configurations, and duplicated descriptions are omitted.

[0010] In the following description, the terms front / rear, side (left / right), top / bottom, etc., refer to relative positions based on the vehicle. In addition, the letters L and R attached to the reference characters indicate the components on the left and right sides in the vehicle width direction, and when the letters L and R are not attached to the reference characters, they refer to the left and right components collectively.

[0011] [Embodiment 1] Hereinafter, the power conversion device of the first embodiment will be described with reference to Figs.

[0012] Fig. 1 is a right side view (a) of a vehicle equipped with the power conversion device of this embodiment, and a view (b) showing a mechanism driven by human power. Fig. 2 is a side cross-sectional view (a) of the power conversion device of embodiment 1 as seen from the right side of the vehicle, and a cross-sectional view (b) of line ii of (a). Fig. 3 and Fig. 4 are diagrams for explaining the power conversion efficiency of embodiment 1.

[0013] The power conversion device 10 of this embodiment is mounted on a vehicle 1 driven by human power such as a bicycle, and is a device that converts linear reciprocating motion into rotational motion. The power conversion device 10 alternately moves the left and right pedals 3L, 3R in the up and down direction, and converts the linear reciprocating motion of the pedals 3L, 3R into rotational reciprocating motion. The left and right pedals 3L, 3R are provided with a plurality of rollers 4 that can rotate freely, and the rollers 4 smoothly move linearly back and forth in the up and down direction along a guide rail 5, thereby causing the pedals 3L, 3R to move back and forth in the up and down direction. In addition, the left and right pedals 3L, 3R are connected by an input chain 6, and the input chain 6 is wound around an input sprocket 11, so that the linear reciprocating motion of the pedals 3L, 3R is converted into the rotational motion of the input sprocket 11 via the input chain 6.

[0014] For example, the user can alternately step on the left and right pedals 3L, 3R. When one of the left and right pedals 3L, 3R (e.g., 3L) is pressed down, the other pedal (e.g., 3R) is pressed up and returns to the position before it was pressed down. As with a normal bicycle, the rear wheel is driven and the bicycle moves when the user alternately steps up and down on the left and right pedals 3L, 3R.

[0015] In the power conversion device 10 of this embodiment, the input sprocket 11 is rotated in a first direction or a second direction opposite to the first direction via the input chain 6 by reciprocating the left and right pedals 3L, 3R. The driving force of the input sprocket 11 is input to a first shaft 14 or a second shaft 18 via a transmission sprocket 16 by a first one-way clutch 12 and a second one-way clutch 13.

[0016] In this embodiment, an example is described in which the power conversion device 10 is mounted on a vehicle 1 such as a bicycle, but the present invention is not limited to this and can be applied to a training device that converts linear reciprocating motion by human power such as hands and feet into rotational motion, an emergency power generation device, an article feeding device, etc.

[0017] Next, the configuration and functions of the power conversion device 10 of the first embodiment will be described with reference to FIG.

[0018] The power conversion device 10 of this embodiment includes a first shaft 14 and a second shaft 18 that are arranged parallel to each other in the vertical direction of the vehicle 1 and extend in the front-rear direction of the vehicle.

[0019] The first shaft 14 receives the driving force due to the linear reciprocating motion of the left and right pedals 3L, 3R via the input chain 6 and the input sprocket 11 as a rotational driving force, and rotates around the first axis 14AX. The first shaft 14 is disposed above the second shaft 18, and both ends are rotatably supported by bearings 15a, 15b. The first shaft 14 has an enlarged diameter portion 14a on the upstream side (rear side of the vehicle) of the driving force transmission direction D1, where the driving force is input from the input sprocket 11 to the first shaft 14 and output from the transmission gear 17 to the second shaft 18. An inner ring portion (inner race) of the first one-way clutch 12 is fixed to the outer periphery of the enlarged diameter portion 14a of the first shaft 14, and an outer ring portion (outer race) of the first one-way clutch 12 is fixed to the inner periphery of the input sprocket 11. In this manner, the first one-way clutch 12 is disposed between the hollow inner peripheral portion of the input sprocket 11 and the outer peripheral portion of the enlarged diameter portion 14a provided on the first shaft 14. An input chain 6 connected to the left and right pedals 3L, 3R is wound around a gear portion on the outer peripheral portion of the input sprocket 11. The input chain 6 is guided by an arc-shaped chain guide 7 that follows the gear portion on the outer peripheral portion of the input sprocket 11 so as not to fall off the input sprocket 11. In addition, a transmission sprocket 16 is rotatably supported on the first shaft 14 adjacent to the enlarged diameter portion 14a on the downstream side of the enlarged diameter portion 14a in the driving force transmission direction D1. The transmission sprocket 16 has a protruding portion 16a whose inner diameter portion protrudes upstream in the driving force transmission direction D1. An inner race of second one-way clutch 13 is fixed to the outer periphery of protrusion 16a of transmission sprocket 16, and an outer race of second one-way clutch 13 is fixed to the inner periphery of input sprocket 11. In this manner, second one-way clutch 13 is disposed between the hollow inner periphery of input sprocket 11 and the outer periphery of axial protrusion 16a provided on transmission sprocket 16.

[0020] Further, a transmission gear 17 is fixed to the first shaft 14 on the downstream side in the driving force transmission direction D1 of the transmission sprocket 16. The transmission gear 17 rotates together with the first shaft 14.

[0021] The second shaft 18 receives the driving force generated by the rotation of the first shaft 14 and rotates about a second axis 18AX. The second shaft 18 is disposed below the first shaft 14 and is rotatably supported at both ends by bearings 19a, 19b. A bevel gear 20 is fixed to the end of the second shaft 18 on the downstream side (rear side of the vehicle) in the driving force transmission direction D2 from the first shaft 14 until the driving force is output to the third shaft 26.

[0022] Further, a transmitted sprocket 21 is fixed to the second shaft 18 adjacent to the bearing 19a on the downstream side of the bevel gear 20 and the bearings 19a, 19b in the driving force transmission direction D2. A transmission chain 22 is wound around the transmission sprocket 16, and the transmitted sprocket 21 rotates in the same direction as the transmission sprocket 16. The transmission chain 22 rotates in the same phase as the transmission sprocket 16 to transmit the driving force to the transmitted sprocket 21, which rotates the second shaft 18.

[0023] Further, a transmitted gear 23 is fixed to the second shaft 18 on the upstream side of the transmitted sprocket 21 in the driving force transmission direction D2. The transmitted gear 23 meshes with the transmission gear 17 of the first shaft 14 and rotates simultaneously with the second shaft 18. When the transmission gear 17 rotates simultaneously with the first shaft 14, the transmitted gear 23 is rotated, and the second shaft 18 rotates simultaneously with the transmitted gear 23. Further, the transmitted gear 23 can selectively mesh with a drive shaft 31 of an electric motor 30 for an electric-assisted bicycle.

[0024] Bevel gear 20 of second shaft 18 meshes with a bevel gear (not shown) of drive sprocket 25, converting the rotational direction of second shaft 18 to a perpendicular direction and transmitting driving force to drive sprocket 25, which rotates and drives third shaft 26 to which drive sprocket 25 is fixed. Drive sprocket 25 has drive chain 27 wound around a sprocket (not shown) that drives the rear wheel, and drives the rear wheel in the same way as a normal bicycle.

[0025] The power conversion device 10 having the above-mentioned configuration includes a first mechanism (left and right pedals 3L, 3R, input chain 6, etc.) that performs linear reciprocating motion, and a second mechanism (input sprocket 11, first and second one-way clutches 12, 13, first shaft 14, second shaft 18, etc.) that performs rotational motion. The first mechanism transmits driving force generated by the linear reciprocating motion to the second mechanism. The second mechanism converts the driving force transmitted from the first mechanism into rotational driving force. The first mechanism includes left and right pedals 3L, 3R that perform reciprocating motion in mutually opposite directions, and an input chain 6 that rotates the input sprocket 11 of the second mechanism by the mutually opposite linear reciprocating motion of the left and right pedals 3L, 3R. The second mechanism includes a first one-way clutch 12, a second one-way clutch 13, a first shaft 14, and a second shaft 18 that convert the opposing driving forces transmitted from the input chain 6 of the first mechanism to the input sprocket 11 into a driving force that rotates in one direction.

[0026] In this embodiment, the direction in which the first shaft 14 rotates due to the driving force generated by the rotation of the input sprocket 11 (clockwise in FIG. 2(b)) is defined as the first direction (positive direction), and the direction in which the transmission sprocket 16 rotates due to the driving force generated by the rotation of the input sprocket 11 (counterclockwise in FIG. 2(b)) is defined as the second direction (negative direction).

[0027] When one of the left and right pedals 3R, 3L (for example, the left pedal 3L) is pressed down and moves downward, the input sprocket 11 rotates in the positive direction. When the other of the left and right pedals 3R, 3L (for example, the right pedal 3R) is pressed down and moves downward, the input sprocket 11 rotates in the negative direction. The first one-way clutch 12 is activated when the input sprocket 11 rotates in the positive direction, and the driving force due to the rotation of the input sprocket 11 is transmitted to the first shaft 14. When the first shaft 14 rotates in the positive direction, the rotation of the transmission gear 17 is transmitted to the transmitted gear 23, and the second shaft 18 rotates in the negative direction. In this case, the second one-way clutch 13 is in an inactive state, and the driving force is not transmitted from the input sprocket 11 to the transmission sprocket 16, and the driving force is not transmitted from the transmission sprocket 16 to the transmitted sprocket 21 via the transmission chain 22, so that the second shaft 18 is not driven to rotate.

[0028] In addition, when the other of the left and right pedals 3R, 3L (for example, the right pedal 3R) is pressed down and moves downward, the input sprocket 11 rotates in the negative direction, and when one of the left and right pedals 3R, 3L (for example, the left pedal 3L) is pressed down and moves downward, the input sprocket 11 rotates in the positive direction. The second one-way clutch 13 is activated when the input sprocket 11 rotates in the negative direction, and the driving force due to the rotation of the input sprocket 11 is transmitted to the transmission sprocket 16. When the transmission sprocket 16 rotates in the negative direction, the rotation of the transmission sprocket 16 is transmitted to the transmitted sprocket 21 via the transmission chain 22, and the second shaft 18 rotates in the negative direction. In this case, the first one-way clutch 12 is not activated, and the driving force is not transmitted from the input sprocket 11 to the first shaft 14, so that the first shaft 14 is not driven to rotate.

[0029] In the power conversion device 10 of this embodiment, by reciprocating the left and right pedals 3L, 3R, the input sprocket 11 rotates reciprocally in positive and negative directions via the input chain 6. The driving force of the input sprocket 11 is input by a first one-way clutch 12 and a second one-way clutch 13 to a first shaft 14 or a second shaft 18 via a transmission sprocket 16.

[0030] In addition, second shaft 18 rotates in one direction (negative direction) whether driving force is input from first one-way clutch 12 via first shaft 14 or whether driving force is input from second one-way clutch 13 via transfer sprocket 16. In other words, in conjunction with the switching of the rotation direction of input sprocket 11 between positive and negative directions, second shaft 18 is always driven to rotate in a constant negative direction, whether first shaft 14 rotates in the positive direction or transfer sprocket 16 rotates in the negative direction. As a result, second shaft 18 rotates third shaft 26 in one direction, and the rear wheel of the bicycle is driven to rotate in one direction.

[0031] When the input sprocket 11 rotates in the positive direction, the first one-way clutch 12 is in an active state in which the first shaft 14 rotates simultaneously with the input sprocket 11, and when the input sprocket 11 rotates in the negative direction, the first one-way clutch 12 is in an inactive state in which the first shaft 14 rotates idly relative to the first shaft 14. When the first one-way clutch 12 is in an active state, a first driving force transmission path is formed in which the driving force of the input sprocket 11 is transmitted from the first shaft 14 to the second shaft 18 via the transmission gear 17 and the transmitted gear 23.

[0032] When the input sprocket 11 rotates in the positive direction, the second one-way clutch 13 is in an inoperative state in which it rotates freely relative to the transmission sprocket 16, and when the input sprocket 11 rotates in the negative direction, the second one-way clutch 13 is in an operative state in which the transmission sprocket 16 rotates simultaneously with the input sprocket 11. When the second one-way clutch 13 is in an operative state, a second driving force transmission path is formed in which the driving force of the input sprocket 11 is transmitted from the transmission sprocket 16 to the second shaft 18 via the transmission chain 22 and the transmitted sprocket 21.

[0033] In this embodiment, the first one-way clutch 12 and the second one-way clutch 13 are disposed on the most upstream side in the driving force transmission direction D1 from the input sprocket 11. This makes it possible to minimize the number of parts that rotate back and forth and to achieve high power conversion efficiency with a simple configuration.

[0034] When used as an electrically assisted bicycle, the drive shaft 51 of the electric motor 30 can be meshed with the transmitted gear 23, and the second shaft 18 is driven by the driving force transmitted from the electric motor 30 via the transmitted gear 23. In this way, motorization is possible simply by adding the electric motor 30.

[0035] <Power conversion efficiency> The power conversion efficiency of the power conversion device 10 of this embodiment is calculated using equations 1 to 4 in Fig. 3, and is more efficient than conventional methods that are driven by rotational motion. The power conversion efficiency of the power conversion device 10 of this embodiment is achieved by increasing the mechanical transmission efficiency, which is the power loss in equation 3, and reducing the linear reciprocating motion loss and the rotary reciprocating motion loss.

[0036] The mechanical transmission efficiency is the mechanical loss that occurs from the input chain 6 connected to the pedals 3L, 3R to the input sprocket 11, from the first shaft 14 to the second shaft 18, and from the second shaft 18 to the third shaft 26, and the mechanical transmission efficiency at each point is approximately 0.97, which is relatively good.

[0037] Reciprocating motion loss is the driving force lost when parts that repeatedly reciprocate, such as the left and right pedals 3L, 3R and the input sprocket 11, accelerate or decelerate to the speed at which the first and second one-way clutches 12, 13 operate. After the first and second one-way clutches 12, 13 operate, the power becomes the driving force for the bicycle, and no loss occurs. As shown in Figure 4(b), reciprocating motion loss is lost four times per cycle in which the left and right pedals 3L, 3R are each depressed once.

[0038] The parts related to mechanical loss during linear reciprocating motion are the left and right pedals 3L, 3R and part of the input chain 6. The parts related to mechanical loss during rotary reciprocating motion are part of the input chain 6 and the input sprocket 11.

[0039] In order to reduce reciprocating motion loss, it is important to reduce the mass m of the left and right pedals 3L, 3R and part of the input chain 6 in the case of linear motion, and to reduce the inertial mass I of part of the input chain 6 and the input sprocket 11 in the case of rotational motion.

[0040] In this embodiment, the mass m and the inertial mass I are formed from fewer parts than in the past, so that mechanical loss can be reduced and high power conversion efficiency can be achieved.

[0041] In this embodiment, in order to reduce the inertial mass I of the rotating parts, the input sprocket 11 is hollow, and first and second one-way clutches 12, 13 are provided inside the hollow inner periphery of the input sprocket 11.

[0042] In this embodiment, in order to reduce the mass m of the linearly moving parts, the input chain 6 is only between the left and right pedals 3L, 3R, and the length of the chain is about half that of the conventional chain. Also, by providing a chain guide 7 on the outer periphery of the input sprocket 11, it is possible to prevent the chain from falling off without providing a full circle of chain and an idle sprocket that pairs with the input sprocket. Also, since there is no full circle of chain, the device can be made smaller, and for example, the bicycle frame 8 can be passed under the device, which increases the degree of freedom when mounting it on a bicycle.

[0043] According to embodiment 1, the power conversion efficiency of conventional systems that use rotational motion is largely determined by the skill of the user, but by using a system that uses linear motion, it is possible to improve the power conversion efficiency and increase the driving force regardless of the user's skill.

[0044] Furthermore, by reducing the number of parts that perform linear reciprocating motion, high motion conversion efficiency can be achieved with a simple configuration.

[0045] In addition, since the user only has to move the pedal back and forth in a straight line, the user's skill is not as important.

[0046] [Embodiment 2] Next, a power conversion device according to a second embodiment will be described with reference to FIG.

[0047] 5A is a side cross-sectional view of the power conversion device of the second embodiment as viewed from the right side of the vehicle, and FIG. 5B is a cross-sectional view taken along line ii-ii of FIG. 5A. In the following description, the same components as those of the first embodiment are denoted by the same reference numerals and will not be described.

[0048] In the following, in accordance with the first embodiment, the one-way clutch that forms the first driving force transmission path will be described as the first one-way clutch, and the one-way clutch that forms the second driving force transmission path will be described as the second one-way clutch.

[0049] In the power conversion device 100 of embodiment 2, an input sprocket 110 is fixed to a first shaft 14 and rotates simultaneously, a transmission sprocket 116 is journaled on the first shaft 14 via a second one-way clutch 113, and a transmission gear 117 is journaled on the first shaft 14 via a first one-way clutch 112.

[0050] When the first shaft 14 rotates in the forward direction, the second one-way clutch 113 is in an inoperative state where it rotates idly relative to the rotation of the first shaft 14, while the first one-way clutch 112 is in an operative state where it rotates simultaneously with the first shaft 14, and the transmission gear 117 rotates in the forward direction. Then, the driving force is transmitted from the transmission gear 117 to the transmitted gear 23, and the second shaft 18 is driven to rotate in the negative direction.

[0051] When the first shaft 14 rotates in the negative direction, the first one-way clutch 112 is in an inoperative state where it rotates freely relative to the first shaft 14, while the second one-way clutch 113 is in an operative state where it rotates simultaneously with the first shaft 14, and the transmission sprocket 116 rotates in the negative direction. Then, the driving force is transmitted from the transmission sprocket 116 to the transmitted sprocket 21 via the transmission chain 22, and the second shaft 18 is driven to rotate in the negative direction.

[0052] In embodiment 2, when the input sprocket 110 rotates in the positive direction, the second one-way clutch 113 is in a non-operating state in which it rotates freely relative to the first shaft 14, and when the input sprocket 110 rotates in the negative direction, the second one-way clutch 113 is in an operating state in which it rotates simultaneously with the first shaft 14.

[0053] When the input sprocket 110 rotates in the positive direction, the first one-way clutch 112 is in an operating state in which it rotates simultaneously with the first shaft 14, and when the input sprocket 110 rotates in the negative direction, the first one-way clutch 112 is in a non-operating state in which it rotates freely relative to the first shaft 14.

[0054] According to the second embodiment, in addition to the effects of the first embodiment, the structure of the parts can be simplified and costs can be reduced. In the second embodiment, the position of the first one-way clutch 112 is changed to the transmission gear 117, and the first shaft 14 is added to the reciprocating parts, resulting in a decrease in efficiency, but the structure of the device can be simplified and the cost can be reduced.

[0055] The present invention is not limited to the above-described embodiment, and various changes and modifications can be made without departing from the spirit and scope of the present invention. For example, the power conversion device of the present invention is not limited to bicycles, and can be applied to other vehicles and devices.

[0056] [Summary of the embodiment] The above-described embodiments disclose at least the following power conversion device.

[0057] <Aspect 1> The power conversion device 10 converts linear reciprocating motion into rotational motion, The device includes a first mechanism that performs a linear reciprocating motion and a second mechanism that performs a rotational motion, The first mechanism transmits a driving force generated by the linear reciprocating motion to the second mechanism, The second mechanism converts the driving force transmitted from the first mechanism into a rotational driving force, The first mechanism includes first reciprocating members 3L, 3R which reciprocate in directions opposite to each other, and a second reciprocating member 6 which rotates a first rotating member 11 of the second mechanism by the linear reciprocating motion of the first reciprocating members in opposite directions; The second mechanism includes a plurality of second rotating members 11 to 14, 18 that convert a driving force in an opposing direction transmitted from the first mechanism to the first rotating members into a driving force that rotates in one direction.

[0058] According to the first embodiment, the efficiency of the conventional rotary motion drive system is dominated by the driver's skill, but by using a linear motion drive system, it is possible to improve efficiency and increase driving force regardless of the driver's skill. Also, by reducing the number of linearly moving parts, it is possible to convert to rotary motion with high efficiency. Also, since the user only needs to move the pedals back and forth in a straight line, the user's skill is less important.

[0059] <Aspect 2> In the first embodiment, the second rotating member includes a plurality of one-way clutches 12, 13 that transmit driving force only when rotating in one direction.

[0060] According to the second aspect, the number of parts that perform reciprocating rotational motion is minimized, and high motion conversion efficiency can be achieved with a simple configuration.

[0061] <Third aspect> In a second aspect, the plurality of one-way clutches include a first one-way clutch 12 that transmits a driving force when the first rotating member rotates in a first direction, and a second one-way clutch 13 that transmits a driving force when the first rotating member rotates in a second direction opposite to the first direction, The second mechanism includes a first shaft 14 that rotates when a driving force is transmitted from the first one-way clutch 12, and a second shaft 18 that rotates when a driving force is transmitted from the second one-way clutch.

[0062] <Fourth aspect> In a third aspect, the second mechanism includes a first gear pair 17, 23 that transmits the driving force transmitted from the first one-way clutch 12 to the first shaft 14 to the second shaft 18; The second one-way clutch 13 includes a second gear pair 16, 21 that transmits driving force from the second one-way clutch 13 to the second shaft 18.

[0063] <Fifth aspect> In a fourth embodiment, the first gear pair includes a transmission gear 17 that rotates simultaneously with the first shaft 14, and a transmitted gear 23 that rotates simultaneously with the second shaft 18 and meshes with the transmission gear 17, The second gear pair includes a transmission sprocket 16 rotatably supported on the first shaft 14, and a transmitted sprocket 21 which rotates simultaneously with the second shaft 18 connected to the transmission sprocket 16 by a chain 22.

[0064] <Sixth aspect> In a fifth aspect, the first mechanism is such that the transmission sprocket 16 is disposed downstream of the first rotating member 11 in the driving force transmission direction D1 of the first shaft 14, and the transmission gear 17 is disposed downstream of the transmission sprocket 16 in the driving force transmission direction D1 of the first shaft 14, In the second mechanism, the transmitted sprocket 21 is disposed downstream of the transmitted gear 23 in the driving force transmitting direction D2 on the second shaft 18.

[0065] According to the third to sixth embodiments, when the first one-way clutch 12 is in an operating state, a first driving force transmission path is formed in which the driving force of the first rotating member 11 is transmitted from the first shaft 14 via the transmission gear 17 and the transmitted gear 23 to the second shaft 12, and when the second one-way clutch 13 is in an operating state, a second driving force transmission path is formed in which the driving force of the first rotating member 11 is transmitted from the transmission sprocket 16 to the second shaft 18 via the transmitted sprocket 21.

[0066] <Seventh aspect> In any one of the third to sixth aspects, the driving force of the second shaft 18 is converted by the bevel gear 20 into a rotational force in an orthogonal direction and output.

[0067] According to the seventh embodiment, the rear wheel can be driven in the same way as a normal bicycle.

[0068] <Eighth aspect> In the sixth or seventh aspect, it is possible to connect the drive shaft 31 of the electric motor 30 to the transmitted gear 23, The second shaft 18 is driven by a driving force transmitted from the electric motor 30 via the transmitted gear 23 .

[0069] According to the eighth embodiment, simply by adding the electric motor 30, it becomes possible to motorize the vehicle like an electrically assisted bicycle.

[0070] <Ninth aspect> In any one of the third to seventh aspects, the first one-way clutch 12 and the second one-way clutch 13 are disposed on the most upstream side of the first shaft 14 in a driving force transmission direction D1, The first one-way clutch 12 is disposed upstream of the second one-way clutch 13 in the driving force transmission direction D1 on the first shaft 14.

[0071] According to the ninth aspect, the number of parts that rotate and reciprocate can be minimized, thereby achieving high efficiency.

[0072] <Tenth aspect> In the fifth or sixth aspect, the first one-way clutch 12 is disposed between a hollow inner peripheral portion of the first rotating member 11 and an outer peripheral portion of an enlarged diameter portion 14a provided on the first shaft 14, The second one-way clutch 13 is disposed between a hollow inner peripheral portion of the first rotating member 11 and an outer peripheral portion of an axial protrusion 16 a provided on the transmission sprocket 16 .

[0073] According to the tenth aspect, the inertial mass of the rotating parts can be reduced, mechanical loss can be reduced, and high efficiency can be achieved.

[0074] <Eleventh aspect> In any one of the first to tenth aspects, the first reciprocating member is a pair of pedals 3L, 3R that reciprocate linearly in the vertical direction, The second reciprocating member is a chain 6 whose both ends are connected to the pair of pedals 3L, 3R and which meshes with the first rotating member 11.

[0075] According to the eleventh embodiment, since a full revolution of chain is not required, the mass of the linearly moving parts can be reduced, and the device can be made more compact. For example, since the bicycle frame can be passed under the device, the degree of freedom in mounting it on a bicycle is increased.

[0076] <Twelfth aspect> In an eleventh embodiment, a chain guide 7 for preventing the chain 6 from falling off is provided on the outer periphery of the first rotating member 11 .

[0077] According to the twelfth embodiment, it is possible to prevent the chain from falling off even without providing a full turn of the chain and an idle sprocket. In addition, since a full turn of the chain is not required, the device can be made more compact, and since the bicycle frame 8 can be passed under the device, there is a higher degree of freedom in mounting it on the bicycle. [Explanation of symbols]

[0078] 1. Vehicle 3L, 3R...Left and right pedals 4. Lola 5...Guide rail 6…Input Chain 7…Chain guide 8. Bicycle frame 10,100…Power conversion device 11,110…Input sprocket 12,112…First one-way clutch 13,113…Second one-way clutch 14…First shaft 14AX…1st axis 14a…Enlarged diameter section 15a, 15b...Bearings 16,116…Transmission sprocket 16a...Protruding part 17,117...Transmission gear 18…Second shaft 18AX…2nd axis 19a, 19b...Bearings 20…Bevel gear 21...Transmitted sprocket 22...Transmission chain 23...Transmitted gear 25…Drive sprocket 26…Third shaft 27...Drive chain 30...Electric motor 31...Motor drive shaft D1: Driving force transmission direction in the first shaft D2: Driving force transmission direction in the second shaft

Claims

1. A power conversion device that converts linear reciprocating motion into rotational motion, A first mechanism that performs a linear reciprocating motion and a second mechanism that performs a rotational motion, The first mechanism transmits a driving force generated by the linear reciprocating motion to the second mechanism, The second mechanism converts the driving force transmitted from the first mechanism into a rotational driving force, the first mechanism includes a first reciprocating member that reciprocates in directions opposite to each other, and a second reciprocating member that rotates a first rotating member of the second mechanism by the linear reciprocating motion of the first reciprocating member in opposite directions; a power conversion device characterized in that the second mechanism includes a plurality of second rotating members that convert the driving forces in opposite directions transmitted from the first mechanism to the first rotating members into driving forces that rotate in one direction.

2. 2. The power conversion device according to claim 1, wherein the second rotating member includes a plurality of one-way clutches that transmit driving force only when the second rotating member rotates in one direction.

3. the plurality of one-way clutches include a first one-way clutch that transmits a driving force when the first rotating member rotates in a first direction, and a second one-way clutch that transmits a driving force when the first rotating member rotates in a second direction opposite to the first direction, 3. The power conversion device according to claim 2, wherein the second mechanism includes a first shaft that rotates by receiving a driving force from the first one-way clutch, and a second shaft that rotates by receiving a driving force from the second one-way clutch.

4. the second mechanism includes a first gear pair that transmits the driving force transmitted from the first one-way clutch to the first shaft to the second shaft; 4. The power conversion device according to claim 3, further comprising a second gear pair for transmitting driving force from said second one-way clutch to said second shaft.

5. the first gear pair includes a transmission gear that rotates simultaneously with the first shaft and a transmitted gear that rotates simultaneously with the second shaft and meshes with the transmission gear, 5. The power conversion device according to claim 4, wherein the second gear pair includes a transmission sprocket rotatably supported on the first shaft, and a transmitted sprocket that rotates simultaneously with the second shaft and is connected to the transmission sprocket by a chain.

6. The first mechanism is arranged such that the transmission sprocket is disposed downstream of the first rotating member in a driving force transmission direction on the first shaft, and the transmission gear is disposed downstream of the transmission sprocket in the driving force transmission direction on the first shaft, 6. The power conversion device according to claim 5, wherein the second mechanism is arranged such that the transmitted sprocket is located downstream of the transmitted gear in the driving force transmission direction on the second shaft.

7. 4. The power conversion device according to claim 3, wherein the driving force of the second shaft is converted into a rotational direction perpendicular to the rotational direction by a bevel gear and then output.

8. A drive shaft of an electric motor can be connected to the transmitted gear, 7. The power conversion device according to claim 6, wherein the second shaft is driven by a driving force transmitted from the electric motor via the transmitted gear.

9. the first one-way clutch and the second one-way clutch are disposed on the most upstream side of the first shaft in a driving force transmission direction, 4. The power conversion device according to claim 3, wherein the first one-way clutch is disposed upstream of the second one-way clutch in a driving force transmission direction on the first shaft.

10. the first one-way clutch is disposed between a hollow inner peripheral portion of the first rotating member and an outer peripheral portion of an enlarged diameter portion provided on the first shaft, 6. The power conversion device according to claim 5, wherein the second one-way clutch is disposed between a hollow inner peripheral portion of the first rotating member and an outer peripheral portion of an axial protrusion provided on the transmission sprocket.

11. the first reciprocating member is a pair of pedals that reciprocate linearly in an up-down direction, 2. The power conversion device according to claim 1, wherein the second reciprocating member is a chain having both ends connected to the pair of pedals and meshing with the first rotating member.

12. 12. The power conversion device according to claim 11, wherein a chain guide is provided on an outer periphery of the first rotating member to prevent the chain from falling off.

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