CN-122003359-A - Pedal shifting type crank rotation driving mechanism

Abstract

The present invention relates to a crank rotation driving mechanism including left and right pedals alternately applying an external force to a pair of left and right crank arms attached to a crank shaft, and an output portion integrally rotating with the crank shaft. The present invention provides a crank rotation driving mechanism which can be used for a long time without requiring a large foot force. The present invention provides a pedal-shift-type crank rotation driving mechanism Z including a pair of left and right crank arms CA and a crank rotation shaft CX2 fixed to a crank shaft CX1 supported by a frame F or the like, a pair of left and right swing arms A supported by a fixed swing fulcrum shaft A4 at a position apart from the crank shaft CX1, a first slider S1 supported by the crank rotation shaft CX2 and reciprocally moved in a longitudinal direction of the swing arms A, a second slider S2 reciprocally moved intermittently in contact or non-contact with the first slider S1, and a pedal P attached to a second slider front block S21 and rotating the crank shaft CX1 while drawing a substantially elliptical locus by swinging the swing arms A, the pedal-shift-type crank rotation driving mechanism Z imparting a rotational output to an output section 5. The invention is not only suitable for common bicycles, but also suitable for bicycles facing to the weak or commercial tricycles, exercise equipment, labor-saving equipment, devices and the like.

Inventors

• UCHIKAWA YASUO

Assignees

• 内川靖夫

Dates

Publication Date

20260508

Application Date

20250129

Priority Date

20240426

Claims (2)

1. 1. A pedal-shift-type crank rotation driving mechanism is characterized by comprising: a pair of left and right crank arms which are respectively fixed to both end portions of a crank shaft rotatably mounted to a frame or the like, and which operate with an operating phase angle difference of 180 degrees; a crank rotation shaft provided at the front ends of the left and right crank arms; A pair of left and right swing arms supported by a fixed swing fulcrum shaft fixedly disposed at a position of the frame or the like apart from the crank shaft by a length exceeding a crank arm length; A pair of left and right first sliders rotatably supported by the crank shaft and held by the swing arm so as to be reciprocally movable in a longitudinal direction of the swing arm, wherein when a direction of the fixed swing fulcrum shaft in the longitudinal direction is a rear end side and a direction opposite thereto is a front end side, a first slider front end side contact portion and a first slider rear end side contact portion integrally movable in the longitudinal direction are held in mutually opposite directions; A pair of right and left second sliders held by the swing arm and capable of reciprocating along the longitudinal direction of the swing arm, the second slider having a second slider front end side contact portion and a second slider rear end side contact portion integrally moving in the longitudinal direction held in a direction facing each other with a predetermined interval therebetween, the second slider being reciprocally moved intermittently in the same direction and within a movable range by contact or non-contact of the opposing first slider front end side contact portion and the second slider front end side contact portion, or contact or non-contact of the opposing first slider rear end side contact portion and the second slider rear end side contact portion, and A pair of left and right pedals attached to a second slider front block configured to be positioned on a front end side of the first slider during reciprocation of the first slider, the pair of left and right pedals alternately swinging the left and right swing arms by their alternate actions to apply rotational force to the crank arm via the first slider while drawing a deformed elliptic locus in cooperation with the swing, The pedal-shift-type crank rotation driving mechanism imparts a rotational output to an output portion that rotates integrally with the crank shaft.
2. 2. The pedal-shifted crank rotary drive mechanism according to claim 1, comprising: An elastic support member having a contact portion held at the tip end side of either the first slider or the second slider, for transmitting a force for moving the second slider in a movable range toward the tip end side in the longitudinal direction while receiving and contracting in accordance with a variation in the interval between the first slider and the second slider in accordance with the variation, and And a support abutment member having a distal end side abutment portion held by either the second slider or the first slider.

Description

Pedal shifting type crank rotation driving mechanism Technical Field The present invention relates to a pedal-shift-type crank rotation driving mechanism including left and right pedals alternately applying an external force to a pair of left and right crank arms attached to a crank shaft, and an output portion integrally rotating with the crank shaft. Background Conventionally, as a related crank rotation driving system, there is a system shown in patent document 1 (see paragraphs [0011] to [0021], fig. 1 and fig. 2), for example. The system includes a pedal shaft 10 fixed to the frame 3 and not rotating itself, guide members 11a and 11b rotating within a predetermined angle around the pedal shaft, and rotatable pedals 12a and 12b attached to the guide members 11a and 11b and reciprocating up and down. Guide grooves 13a and 13b are formed inside the guide members 11a and 11b, respectively, and protruding members 26a and 26b integrally formed with the crank cams 22a and 22b are accommodated in the guide grooves, respectively. The crank cams 22a and 22b are integrally assembled to the crank shaft 20, and the gear 21 is integrally assembled to the crank shaft. When the pedals 12a and 12b move up and down, the protruding members 26a and 26b rotate along the guide grooves 13a and 13b, and the crank cams 22a and 22b, the crank shaft 20, and the gear 21 rotate. When the gear 21 rotates, the gear 31 engaged with the gear rotates in the opposite direction, and the sprocket 32 integrally formed with the gear 31 also rotates. The fixed shaft 30 is assembled so as to be fixed to the frame 3 without rotating, and only the gear 31 and the sprocket 32 rotate. Therefore, the gear 31 and the sprocket 32 are assembled to the fixed shaft 30 via bearings. When one pedal 12a is at the top dead center and the other pedal 12b is at the bottom dead center, the device operates smoothly when the protruding members 26a, 26b of the crank cams 22a, 22b are operated so as to incline by a predetermined angle θ3 in the direction of rotation through the vertical center line of the crank shaft 20. As in this configuration, the present invention can be applied to a saddle-free bicycle that is advanced by reciprocating pedals up and down. The pedal or the like smoothly acts, so that the up-and-down reciprocation of the pedal is easily converted into a rotation motion. In addition, the user rides standing, whereby the effect of the whole body exercise can be obtained as compared to a bicycle riding in a sitting position. Prior art document patent document 1 Japanese patent application laid-open No. 2010-508191 However, in the conventional crank rotation driving system described above, the movement path during the lifting and lowering of the pedal is in the shape of a circular arc which repeatedly reciprocates up and down in the same path around the pedal shaft 10. Therefore, the user's foot portion, which is different from the foot portion when walking, does not operate naturally, and the force of the foot portion cannot be fully exerted, and the foot portion is easily fatigued and difficult to use for a long period of time. As described above, in the conventional crank rotation driving system, although the entire structure such as the pedal shaft 10 being fixed is simple, there is still a problem to be solved in terms of convenience of the device and the like. Accordingly, there is a need in the art for a crank rotation drive system or mechanism that does not require significant foot force and that can be used for extended periods of time. Disclosure of Invention Feature structure The pedal-shift-type crank rotation driving mechanism according to the present invention is characterized by comprising: a pair of left and right crank arms which are respectively fixed to both end portions of a crank shaft rotatably mounted to a frame or the like, and which operate with an operating phase angle difference of 180 degrees; a crank rotation shaft provided at the front ends of the left and right crank arms; A pair of left and right swing arms supported by a fixed swing fulcrum shaft fixedly disposed at a position of the frame or the like apart from the crank shaft by a length exceeding a crank arm length; A pair of left and right first sliders rotatably supported by the crank shaft and held by the swing arm so as to be reciprocally movable in a longitudinal direction of the swing arm, wherein when a direction of the fixed swing fulcrum shaft in the longitudinal direction is a rear end side and a direction opposite thereto is a front end side, a first slider front end side contact portion and a first slider rear end side contact portion integrally movable in the longitudinal direction are held in mutually opposite directions; A pair of right and left second sliders held by the swing arm and capable of reciprocating along the longitudinal direction of the swing arm, the second slider having a second slider front end side contact portion and a second sli