TW411324B - Transmission device of a bicycle - Google Patents

Abstract

Disclosed is laborsaving transmission device of a bicycle, comprising: a hub with bearing cases on its opposing ends; two bearings provided at inner sides of the bearing cases provided on the opposing ends of the hub; a mandrel provided within the two bearings and with opposing ends being mounted to a bicycle frame; two single-directional rotary members provided around outer peripheries of the bearing cases provided on the opposing ends of the hub, the single-directional rotary members each being annularly provided with a plurality of driving teeth around an outer periphery; a connection wheel provided on the bicycle frame and rotating toward a direction normal to the hub; a transmission chain, sequentially winded around outer peripheries of the first single-directional rotary member, the connection wheel, and the second single-directional rotary member and engaged with the plurality of driving teeth; a bottom support shaft mounted beneath the frame tube of the bicycle frame; two cranks, having an end engaging opposing sides of the bottom support shaft; two pedals each being connected to another ends of the two cranks, the transmission chain with opposing ends each being connected to midsections of the two cranks. As such, when a pedal is pedaled forwards, the crank rotates forwards to induce forward motion of the transmission chain subjecting the single-directional rotary member to drive rotation of the hub. The transmission chain then drives another single-directional member through the connection wheel to rotate in an opposing direction so as to race with respect to the hub. At the same time, the other end of the transmission chain induces the other crank to rotate backwards subjecting rearward rotation of the other pedal. Reciprocal forward pedaling of the two pedals reciprocally induce the two transmission chains forwards resulting in continuous rotation of the hub for achieving the laborsaving effects.

Description

411324 V. Description of the invention ¢ 1) (Field of invention) The present invention relates to a bicycle transmission, and particularly to a bicycle transmission which can save effort. (Description of known technology) The currently used bicycles mainly use a pedal on the crank to drive a sprocket, and the power is transmitted to the rear wheel flywheel group through the chain to drive the rear wheel to make the bicycle forward.

Figure] is a schematic diagram of a conventional bicycle transmission device, which is installed on the frame and includes a flywheel set 11, a bottom bracket shaft 12, a key wheel 13, a first crank 14, a second crank 15, A first pedal 16, a second pedal 17 and a chain 18. The flywheel group 11 is fixed behind the flat fork of the frame; the bottom bracket shaft 12 is rotatably installed under the seat tube of the frame; the sprocket 13 is fixed on the bottom bracket shaft 12; the first crank 14 and One end of the second crank 15 is respectively fixed to both ends of the bottom bracket shaft 12, and the first crank 14 and the second crank 15 are at an angle of 180 degrees; the first pedal 16 and the second pedal 17 are respectively freely It is connected to the other end of the first crank 14 and the second crank 15 in a rotating manner; the chain 18 is wound around the sprocket 13 and the sprocket of the flywheel group 11. FIG. 2 is a schematic axial cross-sectional view of the flywheel group 11, including a wheel valley 111,

Two bearings 112, 113, Yixin Han 114, and a unidirectional transmission member 1 1 5 with key teeth on the outer ring, wherein the hub 1 1 1 has bearing seats at both ends; the two bearings 1 1 2 and 1 1 3 are respectively installed in The inner edge of the bearing seat; the mandrel 1 1 4 is installed in the bearing, and its two ends are fixed behind the flat fork of the frame, and the hub 111 can rotate freely relative thereto; the one-way transmission member 115 is installed on the hub 1 1 1 The outer edge of the bearing housing at one end is surrounded by a chain 1 8 which can drive the hub in one direction.

Page 5 411324 V. Description of the invention ¢ 2) 1 1 1 Turn. With the above device, when the first pedal is stepped down, the sprocket drives the chain to transmit power to the flywheel set to drive the rear wheels to rotate while the second pedal is moved up. By repeatedly pressing the pedals on both sides in this way, the sprocket can continuously drive the flywheel group through the chain, so that the bicycle can continue to move forward.

FIG. 3 is a schematic diagram of a pedal and a crank movement. The resistance from the chain is F w and the sprocket radius R forms the resistance moment F w X R. When the pedal is depressed, the pedal and the crank perform a circular motion. Because the length L of the crank is unchanged, if the pedal is depressed with a power of F, the maximum drive will be generated when the pedal is turned to the A position. Moment LXF, but when the crank is turned to position B with the crank at position <9, the arm is shortened to L c ◦ s 0 and the driving torque is also reduced to FXL c 0 s 0. It can be seen that _, at a position far away from A, a large stepping power is required to form a driving torque of the same magnitude as the anti-torque, and at a position close to A, the required stepping power is small due to the larger arm. 〇

However, in the conventional technology, since the pedal and the crank system perform a circular motion, the pedal and the crank are rotated to a relatively laborious position with each rotation. If you want to continue to apply force near the A position, after stepping down from the A position for a small angle, you must idle back to the A position to step down again. This cannot continue to drive the chain, making the bicycle continue to move forward, and the efficiency It is also greatly reduced by the idling after each step. (Summary of the Invention) 'The object of the present invention is to provide a bicycle transmission device, which has a minimum pedaling power to be applied when a driving torque capable of advancing the bicycle is formed.

Page 6 411324 V. Description of the invention (3) In order to achieve the above-mentioned object, the bicycle transmission device of the present invention includes: a transmission mechanism having a hub with bearing seats at both ends; two bearings respectively installed at the two ends of the hub Inside the bearing seat; a mandrel 'installed in two bearings> Both ends are fixed to the frame, allowing the hub to rotate freely with respect to it; a first unidirectional rotating member and a second unidirectional rotating member It is installed on the outer periphery of the bearing seat at both ends of the wheel, and is arranged along the outer periphery of each unidirectional rotating member. Most of the driving teeth allow only a single direction of transmission to the hub; a connecting wheel can rotate freely. It is installed on the bicycle frame, and its rotation direction is perpendicular to the rotation direction of the wheel hub. A transmission bar extends backward from the middle of the bicycle, and sequentially bypasses the outer periphery of the first unidirectional rotating member, the connecting wheel and the second unidirectional rotating member. It is installed and meshes with most of the driving teeth, and the first end and the second end thereof are respectively cut to the outer periphery of the first unidirectional rotating member and the outer periphery of the second unidirectional rotating member, and extend forward substantially in parallel. And—the pulling mechanism has a bottom bracket shaft fixed under the seat tube of the frame; a first crank and a second crank, one end of which is sleeved on both sides of the bottom bracket shaft via a bearing; a first pedal and A second pedal is connected to the first crank and the other end of the second crank in a freely rotatable manner, the first end of the transmission bar is connected to the middle section of the first crank, and the second end of the transmission bar is connected to the second crank. Middle section. With the above device, when the first pedal is stepped forward, the first crank rotates forward, pulling the first end of the transmission bar forward, making the first unidirectional. Rotating member :; driving the hub to rotate, and the transmission bar Transfer to the second unidirectional rotating member via the connecting wheel, so that the second unidirectional rotating member on the other side rotates in the opposite direction and idles relative to the hub, while the second end of the transmission bar pulls the second crank backward

411324 V. Description of the invention (4) Turn the second pedal backward. In this way, by repeatedly pressing the first pedal and the second pedal forward, the two bars of the transmission bar can be repeatedly pulled forward, so that the hub continues to rotate in the same direction. (Brief description of the drawings) Figure 1 is a schematic diagram of a conventional bicycle transmission device. Fig. 2 is a schematic axial sectional view of a flywheel assembly in a conventional bicycle transmission. Figure 3 is a schematic diagram of the pedal and crank movements in a conventional bicycle transmission. FIG. 4 is a schematic diagram of a bicycle transmission device of the present invention. Fig. 5 is a schematic axial sectional view of a flywheel set in the bicycle transmission of the present invention. Fig. 6 is a schematic diagram of a pedal and a crank moving mode in the bicycle transmission of the present invention. (Symbol description) 1 1 ~ flywheel set 1 1 1 ~ hub 1 1 2 ~ sleeve bearing 1 1 3 ~ bearing 1 1 4 ~ heart 1 1 5 ~ unidirectional transmission member 1 2 ~ bottom bracket shaft 1 3 ~ key wheel 1 4 ~ first crank

411S24 V. Description of the invention (5) 1 5 ~ brother-one crank 1 6 ~ first pedal 1 7 ~ second pedal 1 8 ~ chain 2 1 ~ flywheel group 2 1 1 ~ hub 2 1 2 ~ bearing 2 1 3 ~ Bearing 2 1 4 ~ heart car 2 1 5 ~ first unidirectional transmission member 21 6 ~ second unidirectional transmission member 2 1 7 ~ connecting wheel 2 1 8 ~ bottom bracket shaft 2 1 9 ~ drive bar 2 2 0 ~ The first crank 2 2 1 to the second crank 2 2 2 to the first pedal 2 2 3 to the second pedal (detailed description of the preferred embodiment). FIG. 5 shows the shaft of the flywheel group 21 in the bicycle transmission of the present invention. A schematic cross-sectional view with a hub 2 1 1, two bearings 2 1 2 and 2 1 3, a mandrel 214, a first unidirectional rotating member 215 and a second unidirectional rotating member 21 6, among which: the hub 2 1 1 bearing housing at both ends; two bearings 2 丨 2 and 2 1 3 are installed separately

Page 9 411324 V. Description of the invention (6) Inside the bearing seat at both ends of the hub 2 1 1; the mandrel 2 1 4 is installed in two bearings, and both ends are fixed to the frame, allowing the hub 211 to work against it The front and back can rotate freely; the inner edges of the first unidirectional rotating member 215 and a second unidirectional rotating member 216 are respectively mounted on the outer periphery of the bearing seat at both ends of the hub, and along the outer periphery of each unidirectional rotating member 2 1 5 and 2 1 6 The flange ring is provided with a plurality of driving teeth, which allows only a single direction of transmission to the hub 2 Η. FIG. 4 is a schematic diagram of a bicycle transmission device according to the present invention. The device includes: a transmission mechanism ′ having the flywheel set 2 1 ′ —connecting wheel 2 1 7

A transmission bar 2 1 9; and a pulling mechanism, which has a bottom bracket shaft 218, a first crank 220 and a second crank 221, a first pedal 222 and a second pedal 223; wherein: the connecting wheel 217 to It can be installed on the bicycle frame in a freely rotatable manner, and its rotation direction is perpendicular to the rotation direction of the wheel hub 211; the bottom bracket shaft 218 is fixed under the seat tube of the frame; The first one-way rotating member 215, the connecting wheel 217, and the second one-way rotating member 216 are installed on the outer periphery of the first one-way rotating member 215 and mesh with most of the driving teeth, and the first and second ends thereof are respectively cut to the first one-way rotating member 215. The outer periphery and the second unidirectional rotating member 2 1 6 outer periphery extend forward substantially in parallel, the first end is connected to the middle section of the first crank 220, and the second end is connected to the middle section of the second crank 221; the first crank 220 and the first One end of a crank 221 is sleeved on both sides of the bottom bracket shaft 218 through a bearing, and the other end is connected to the first pedal 22 2 and the second pedal 2 2 3 in a freely rotatable manner.

Page 10 411324 V. Description of the invention (7) When the first pedal 222 is stepped forward, the first crank 220 rotates forward, pulling the first end of the transmission bar 2 1 9 forward, so that the first unidirectional rotation The member 2 1 5 drives the hub 2 1 1 to rotate, and the transmission bar 2 1 9 is transferred to the second unidirectional rotating member 2 1 6 via the connecting wheel 2 1 7 to make the second unidirectional rotating member 2 1 on the other side 6 The rotation direction is opposite, and idling with respect to the hub 2 1 1, while the second end of the transmission bar 2 1 7 pulls the second crank 2 2 1 to rotate backward, so that the second pedal 2 2 3 is backward. In this way, by repeatedly pressing the first pedal 222 and the second pedal 223 forward, the first end and the second end of the transmission bar 2 1 7 can be repeatedly pulled forward, so that the wheel hub 2 1 1 keeps turning in the same direction. . Fig. 6 is a schematic diagram of a pedal and a crank movement in the bicycle transmission of the present invention. In the figure, the resistance force from the transmission bar is Fw, the pedaling power is F, the crank length is L, and the distance between the transmission bar and the crank shaft to the axis of the bracket is R. In the A position, each office is perpendicular to its corresponding force arm, so the driving torque is FXL and the anti-torque is F w XR. If the bicycle is to move forward, the driving torque must be at least equal to the anti-torque, that is, F: F w = R : L. If the pedal is pushed forward and the crank is turned by an angle of 0 to reach the B position, the driving force arm is reduced to LX c 〇s β, but the resistance arm is also reduced to approximately RX c 〇s 0 at this time, so F ·· Fw Is still approximately equal to R: L. As mentioned before, when you step on one pedal forward, the other pedal will be pulled backwards. Therefore, you can apply the same pedaling power to drive the bicycle to continue forward. The pedaling power is only the same as that of L and R The ratio is related.

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Claims (1)

411324: Patent application scope 1. A transmission mechanism, a hub, two ends, with two bearings on the shaft, which are respectively equipped with a mandrel, which are installed on the two to allow the hub to be a positive and negative first unidirectional rotating member relative to it The shaft at both ends of the hub is provided with a plurality of driving teeth, which are installed on the peripheral ring drive; the direction and the components, the majority driving direction rotates forward when the component belt with two unidirectional backwards, and borrows to make 2. The connection The wheel transmission is connected with the moving tooth member extension; the forward moving wheel is rotated, and the hub, such as a transmission wheel, is freely rotated by the rotation direction bar, and the front wheel of the hub and the second single are sprayed together, and its first periphery and the second Pull the transmission bar hub to rotate, and the device is mounted on a body, including: a bearing seat; on the inside of the bearing seat in these cars; in the bearing, both ends are fixed on the body and can be rotated freely; and a second order Directional rotating members, which respectively support the outer periphery of the seat, are mounted on the body along a single direction of rotation of the hub along the outside of each unidirectional rotating member, and the rotation is vertical; and A unidirectional rotation structure is installed to the outer periphery of the rotation member, and is cut at the outer periphery of the first unidirectional rotation member with the one end and the second end, respectively. When the first end is substantially parallel to the first end, the first unidirectional rotation transmission The second unidirectional rotating member transferred to the side by the connecting wheel rotates, and the second end of the transmission bar, the first end of the transmission bar, and the first portion continue to rotate in the same direction. The transmission mechanism of the scope of patent application No. 1 in which: the bar is a key bar; the component is to make the other side pull the front side repeatedly with respect to the wheel hub. Page 12 411324 ^, the scope of patent application The connecting wheel is a sprocket; and ‘the driving teeth set on the outer periphery of the one-way rotating member are sprocket teeth. 3. A bicycle transmission mechanism, which is installed on the bicycle frame and includes: a hub with bearing housings at both ends; two bearings, each installed inside the bearing housings; 'a mandrel, _ installed in the Of the two bearings, the two ends are fixed to the frame, which allows the hub to rotate freely and positively relative to it; a first unidirectional rotating member and a second unidirectional rotating member, which are respectively installed on the hub two The outer periphery of the bearing seat is provided with a plurality of driving teeth along the outer periphery of each one-way rotating member, which allows only a single direction of transmission to the hub;-a connecting wheel, which can be installed on the bicycle frame in a freely rotatable manner The rotation direction of the wheel is perpendicular to the rotation direction of the hub; and a transmission bar extends backward from the middle of the bicycle, sequentially bypassing the outer periphery of the first unidirectional rotating member, the connecting wheel, and the second unidirectional rotating member. Installed and engaged with the plurality of driving teeth, and the first end and the second end thereof are respectively cut to the outer periphery of the first unidirectional rotating member and the outer periphery of the second unidirectional rotating member, and extend substantially parallel to the front; When the first end of the transmission bar is pulled forward, the first unidirectional rotating member drives the hub to rotate, and the transmission bar is transferred to the second unidirectional rotating member via the connecting wheel, so that the other side The second unidirectional rotating member rotates in the opposite direction, idling relative to the hub, and the second end of the transmission bar is retracted, thereby repeatedly pulling the first end and the second end of the transmission bar forward. ,Make Page 13 411324 t 、 Scope of patent application The wheel hub is continuously facing 4. Such as ··· The drive bar is a key bar; the connection rotates in the same direction. The bicycle transmission mechanism of the scope of the patent application No. 3, which is 5. If the first of the two ways of the first crankshaft is connected to the first to drive the drive bar, the first by the handle wheel is a key wheel; And the driving teeth ringed around the outer periphery of the one-way rotating member is a kind of transmission device, which is erected on a body, the transmission mechanism of the first item of the patent; One end is connected with a first pedal and a second pedal through a bearing sleeve, which are respectively connected to the first crank and the second crank to the middle of the first crank and the middle of the transmission handle; when the first pedal is pushed, the first pedal The first end of a crank is forward, which drives the hub to turn the two ends to pull the second crank backwards. With this plate and the second pedal, the second end can be repeatedly pulled forward to make the hub continue to change to the same. A bicycle transmission device capable of achieving a variable speed at a position where the first end of the transmission bar is connected to the second and second cranks, including: the bicycle transmission mechanism such as the third patent application; a pull-out mechanism having a bottom support The bracket shaft is fixed to the pull handle and the side of the application; the connecting end is bent two forwards and the first treading end is changed by the chain teeth. Including: the body is connected to the end which can be from one end; the top of the strip; a bottom bracket is rotated forward by rotating the two ends of the transmission, and the direction of the transmission is repeatedly turned by the same; the end is on the first track. When you pull, you should push forward 6. and the seatpost of the frame. Page 4 41132.4 6. Under the scope of patent application; a first crank and a second crank, one end of which is sleeved on both sides of the bottom bracket shaft through a bearing; a first pedal and a second pedal are respectively Freely connected to the first crank and the other end of the second crank; the first end of the transmission bar is connected to the middle section of the first crank, and the second end of the transmission bar is connected to the middle section of the second crank; When the first pedal is stepped forward, the first crank rotates forward, pulling the first end of the transmission bar forward, driving the hub to rotate, and the second end of the transmission bar pulling the second The crank is backward, so by repeatedly pressing the first pedal and the second pedal forward, the first end and the second end of the transmission bar can be repeatedly pulled forward, so that the hub continues to rotate in the same direction; The purpose of speed change can be achieved by changing the positions where the first end and the second end of the transmission bar are connected to the first crank and the second crank. 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