JP5700341B2 - Bicycle without chain - Google Patents

Description

Mechanical engineering

Planetary gear and transmission mechanism

Mechanical engineering handbook, etc.

Planetary gearbox (Patent application Hei 9-47984) Planetary speed reduction / acceleration mechanism (Patent application Hei 11-106452) Planetary gearbox (Patent application Hei 2009-32616)

Newspaper article Sankei Shimbun May 5, 2002 (folding bicycle development)

A bicycle without a chain that eliminates the chain of the bicycle and has a drive unit capable of speeding up and shifting at the center of the axle of the rear wheel and pedals attached to both ends.

[If the rear wheel and the pedal are connected by a chain, the length of the bicycle is long, making it difficult and compact to fold. ]

[A planetary gearbox and a crankshaft connected to the pedal are installed in the drive, and a slider is placed between them to use a gearbox and a two-stage or several-stage speedup variable speed when using the crankshaft. The rear wheel can be driven. ]

[The distance between the rear wheel and the front wheel of the bicycle can be shortened, and the bicycle can be compact and less oily. Moreover, it is easy to make the structure which folds a bicycle, and it can shorten so that it is not necessary to fold. ]

There is only a frame between the front wheel and the rear wheel, showing a general view of a bicycle without a chain, and there is no chain between the pedal and the rear wheel as in a general bicycle. The bird's-eye view seen from diagonally above and behind shows a frame between the left pedal and the right pedal, and shows that there is a drive unit between the frames in an enlarged view from left to right. Sectional drawing of a drive part is shown. Each part is provided with a reference numeral, and the right side of the figure shows a side view of the part that cannot be seen in the sectional view. Slider {circle around (2)} is a cross-sectional view in the case where the high-speed running is performed at the planetary speed increase at the position where it engages with the sun gear {circle around (3)}. Compared with FIG. 3, the slider (2) is moved to the left and is in a position where it engages with the crankshaft (1) and is a cross-sectional view when traveling at a low speed. A sectional view of the planetary gearbox is shown. When the gear holder (14) is rotated, the planetary gear (4) rotates the sun gear (3) while rotating the inner periphery of the inner tooth (5). The inner gear (5) (number of teeth 72) is fixed, and when the gear holder (14) rotates once, the sun gear (3) (number of teeth 36) rotates twice while meshing with the planetary gear (4) (number of teeth 18). (= 72/36) At the same time, it goes around the inner tooth (5), so it makes a total of three rotations (in this gear configuration) to serve as a gearbox. FIG. 5 is a diagram for illustrating a mechanism in which a wheel rotates by inertia when a wheel is driven when a pedal is depressed, and a rim inner shaft M <8> and a claw <11> or a rim inner shaft F; It is sectional drawing which shows the relationship with (9). It is the side view and sectional drawing for showing the mechanism of change (shift) of high speed and low speed drive.

[Figure 1 shows the configuration of a bicycle without a chain, Figure 2 shows that the drive is provided on the rear wheel, and FIG. 3 shows a cross section of the drive. The component parts are marked. The following describes how low-speed and high-speed driving are performed.
In FIG. 4, when the crankshaft (1) is rotated, the slider (2) rotates the rim inner shaft F (9) through the spline teeth. The teeth of the rim inner shaft F (9) are put on the claw (11) (see FIG. 6) in the rim inner shaft M (8), and the rim inner shaft M (8) is turned. The rim (13) joined with the bolt (8) and the bolt rotates.
The rim is connected to the rear wheel by a spoke or the like, and the rear wheel is driven by one rotation that is the same as one rotation of the crank. As a result, low-speed rotation driving suitable for climbing a slope or the like is possible.
In FIG. 3, when the pedal (7) is rotated, the arm of the right pedal hits the groove of the gear holder shaft holder (17), and the rotation is transmitted to the gear holder shaft holder (17) (see the section BB-BB in FIG. 3). At this time, the crankshaft (1) also rotates but does not mesh with the spline teeth of the slider (2), so the torque of the left pedal is transmitted to the gear holder shaft holder (17) through the crankshaft (1) and the left and right pedals rotate. The force is transmitted to the gear holder shaft holder (17). The gear holder shaft holder (17) is joined to the gear holder (14) with a bolt to rotate the planetary gear (4) attached to the gear holder (14). The planetary gear (4) rotationally drives the sun gear (3) while rotating on the planetary gear shaft (6) and the inner surface of the internal tooth (5). (See Figure 5)
The sun gear {circle over (3)} rotates the slider {circle around (2)} through the spline teeth provided on the inner diameter of the sun gear {3}, and the rim via the slider {circle around (2)} has a speed increasing ratio several times the pedal rotation speed (three times in the case of FIG. 5). The rear wheel (see FIG. 1) is rotationally driven with the inner shaft F <9>, the claw <11>, the rim inner shaft M <8>, and the rim <13>. As a result, high-speed rotation driving when traveling on flat ground is possible.
The internal tooth (5) is built in and fixed to the internal gear flange (15) and the internal gear pair flange (18) and fixed to the bicycle frame (see FIG. 2). The claw spring (11) is for enclosing the claw (11) in the rim inner shaft M (8) so that the rear wheel rotates by inertia when the pedal rotation is stopped. (See Figure 6)
In FIG. 7, the slider (2) moves in the axial direction because the claw at the tip of the clutch inner cylinder (12) (see the section GG in FIG. 7) is fitted in the groove on the inner diameter side of the slider (2). Move 鍔 of 12 ▼ left and right with the shift lever. The shift lever is moved left and right in the same way as a general bicycle by using a lever and a wire provided on the handle. ]

[FIG. 3 shows a driving unit for one rotation of the wheel and three rotations of the wheel for one rotation of the pedal.
If a planetary gear, sun gear, and set of internal teeth are provided in the N set axial direction, a speed increasing drive unit with one wheel rotation and N wheel rotations is possible. ]

[The present invention is important for two-wheeled bicycles, but it can also be used for luggage carrying means such as the rear wheels of three-wheeled bicycles, one for the front two wheels and one for the rear wheels. ]

(1) Crankshaft (2) Slider (3) Sun gear (4) Planetary gear (5) Internal gear (6) Planetary gear shaft (7) Pedal (8) Rim inner shaft M
▲ 9 ▼ Rim inner shaft F ▲ 10 ▼ Claw spring ▲ 11 ▼ Claw ▲ 12 ▼ Clutch inner cylinder ▲ 13 ▼ Rim ▲ 14 ▼ Gear holder ▲ 15 ▼ Internal tooth flange ▲ 16 ▼ Rim left flange ▲ 17 ▼ Gear holder shaft presser ▲ 18 ▼ Internal tooth flange pair

Claims (2)

Unlike ordinary chain-driven bicycles, a crankshaft connected to the pedal is provided on the rear axle, and the planetary gear mechanism's internal teeth are fixed to the bicycle frame and the planetary gear holder is rotated to increase the sun gear. Drive unit capable of high-speed and low-speed shift switching with a switching mechanism that incorporates a slider that switches from the sun gear to the crankshaft when traveling at high speed when driving at high speed and traveling at low speed (one rotation of the crank with one rotation of the wheel) A two-wheeled bike without a chain that can run at low and high speeds. In rear-wheel-drive two-wheel bicycles, rear-wheel drive three-wheel bicycles, front-wheel drive three-wheel bicycles, and unicycles, a crankshaft that connects the pedal to the shaft of the drive wheel is provided, and the planetary gear mechanism's inner teeth are fixed to the bicycle frame. It has a switching mechanism with a built-in slider that switches from the sun gear to the crankshaft when the gear holder is rotated to drive the sun gear at a high speed, and when driving at low speed (one rotation of the crank with one rotation of the wheel). Drive unit capable of switching between high speed and low speed.

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