JP2022100580A - Bicycle non-stage transmission - Google Patents

Abstract

To provide a bicycle non-stage transmission which not only smoothly performs non-stage transmission but also simplifies the structure, can be provided inexpensive and reduces noise, vibration and transmission loss, etc., while preventing driving of a pedal shaft from being stopped in the case of transmission, and in which constitutive parts are hardly worn.SOLUTION: The present invention relates to a non-stage transmission for which a control device is not required. In the non-stage transmission, a magnetic force and a sub gear are attached to a pedal shaft, and inner and outer planetary gears attached to a planetary gear support in a freely removable manner are disposed around the sun gear. The planetary gear support is rotated unidirectionally only in the same direction as a rotation direction of the sun gear. Therefore, while both an input shaft and an output shaft are in a stopped state, each gear is in a low speed state where the gear is engaged constantly in accordance with a gear ratio, and in a direct connection standby state with the sun gear and the inner gear. Even under light load and high load, rotation of the input shaft is transmitted to the output shaft at all the time by one-way clutch connection and magnetic force of the planetary gear support. Thus, when power is needed at the critical moment, it is not necessary to weaken power stepping on pedals.SELECTED DRAWING: Figure 2

Description

The present invention relates to a continuously variable transmission, and is particularly a continuously variable transmission in which a plurality of gears are combined.

Known continuously variable transmissions include V-belt type including metal belt, ring cone type, crankstroke conversion type, etc., and many of them require a control device. It shifts steplessly by unidirectional rotation of the arm (planetary gear support) and induction of magnetic force, and there are various types of multi-speed transmissions as bicycle transmissions, but it is practical as a continuously variable transmission. I can't find anything that is widespread.

However, the above-mentioned conventional continuously variable transmission has the following problems.
(B) The components of the continuously variable transmission are easily worn.
(B) There are many transmission losses that require the input to be stopped when shifting.
(C) Some products generate noise and vibration.
(D) The structure is complicated, a control device is required, and the manufacturing cost is high.
The present invention solves the above-mentioned problems in the conventional continuously variable transmission, and not only facilitates stepless speed change, but also has a simple structure and can be provided at low cost, and noise, vibration, and the like can be provided. This is an attempt to provide a continuously variable transmission with little transmission loss and less wear on each component.

In order to solve the above problems, in the present invention, a sun gear and a permanent magnet that rotate at the same time are rotatably attached to the drive shaft rotated by the pedal only in one direction with respect to the pedal shaft, and face the planetary gear support. This planetary gear support is rotatably attached only in one direction, an internal gear is rotatably attached to the drive shaft with respect to the pedal shaft, and an inner planetary gear is meshed with the sun gear to form the inner planetary gear. To mesh the outer planetary gear, mesh the outer planetary gear with the inner gear, and rotatably support the inner planetary gear and the outer planetary gear on the planetary gear support on the drive shaft. A stepless transmission characterized in that the internal gear is connected to an output shaft.

The continuously variable transmission smoothly performs stepless speed change and automatically without a control device.

It is sectional drawing which shows an example of the continuously variable transmission according to this invention. It is sectional drawing which shows the rotation direction and the operation state of this invention.

The sun gear 3 and the magnet mounting plate 2 are rotatably mounted on the pedal shaft 1 in only one direction. That is, the sun gear 3 and the magnet rotate only in the direction of travel, so that the foot and the device are not affected even if the pedal is reversed.

The inner planetary gear 5 is meshed with the sun gear 3, and the outer planetary gear 7 is meshed with the inner planetary gear 5.

An internal gear 9 is rotatably attached to the pedal shaft 1 or rotatably in only one direction with respect to the pedal shaft 1. The outer planetary gear 7 is meshed with the inner gear 9. A planetary gear support (arm) 11 is rotatably attached to the pedal shaft 1 in only one direction. That is, the planetary gear support 11 is rotatably attached to the pedal shaft 1 only in one direction via a one-way clutch bearing (not shown) as an example. The inner planetary gear 5 and the outer planetary gear 7 are meshed with the planetary gear support 11 and rotatably supported by the shaft 11a, which serves to align the rotation direction with the internal gear.

Further, a chain sprocket or the like is attached to the outside of the internal gear 9 to output.

In the illustrated example, the sun gear 3 is meshed with three opposing inner planetary gears 5, each inner planetary gear 5 is meshed with an outer planetary gear 7, and the planetary gear support 11 is fitted with these. The inner planetary gear 5 and the outer planetary gear 7 are rotatably supported.

In the stepless transmission according to the present invention, as shown in FIG. 1, when the pedal shaft 1 is rotated clockwise, the sun gear 3 rotates clockwise, the inner planetary gear 5 rotates counterclockwise, and the outer side. The planetary gear 7 rotates clockwise. The inner planetary gear 5 and the outer planetary gear 7 are rotatably supported by the planetary gear support 11, but the planetary gear support 11 rotates only in one direction (clockwise in FIG. 2). It's free. That is, since the planetary gear support 11 cannot rotate in the counterclockwise direction, the internal gear 9 meshing with the outer planetary gear 7 that rotates in the clockwise direction rotates in the clockwise direction. In this way, when the pedal shaft 1 is rotated in the clockwise direction with a high load, the planetary gear support 11 is in a stopped state without rotating with respect to one point of the internal gear 9 described later, and the stepless speed change is performed. The machine shifts gears according to the gear ratio of the sun gear 3, the inner planetary gear 5, the outer planetary gear 7, and the internal gear 9 (1: 5).

When the load on the output side of the internal gear 9 becomes light, the planetary gear support 11 that cannot rotate counterclockwise is in the same direction as the internal gear 9 with the help of the magnetic force of the magnetic force plate 2 attached to the pedal shaft. It gradually starts to rotate (clockwise) and becomes a so-called differential state. That is, the continuously variable transmission performs stepless speed change different from the above according to the rotation speed of the planetary gear support 11, and finally the pedal shaft and the internal gear have the same rotation speed, and the internal gear 9 also has a magnetic force. Affected by, but this is also available.
There are methods such as a friction plate and a hydraulic check valve instead of the magnetic force, but they are not preferable because of drawbacks such as wear.

This continuously variable transmission can be used not only for electric auxiliary bicycles but also for automobiles, centrifuges, etc.

1 Drive shaft (pedal shaft)
2 Magnetic force plate
3 Sun gear 5 Inner planetary gear 7 Outer planetary gear 8 Body 9 Internal gear 11 Planetary gear support 11a Shaft 12 One-sided rotary bearing group

Claims (1)

The inner and outer gears are rotatably attached to one or more pairs of planetary gear supports, and this is regarded as one-way rotation, and the rotation directions of the sun gear, the outer planetary gear, the inner gear, and the planetary gear support are matched. A stepless transmission characterized by that.

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