KR101907098B1 - Hydraulic drive unit with pressure adjustment function and bicycle with transmission - Google Patents

Abstract

Disclosed are a hydraulic driving unit with a pressure adjustment function, capable of easily and quickly performing hydraulic gear shifting, and a bicycle with a transmission. According to the present invention, the hydraulic driving unit with a pressure adjustment function comprises: a hydraulic unit to generate hydraulic pressure from a rotational force by a bicycle pedal; a supply pipe to supply output working fluid by the hydraulic pressure generated in the hydraulic unit; a recovery pipe to recover the output working fluid used for driving the front or rear wheel, that is working fluid passing through the hydraulic motor, to the hydraulic unit; a hydraulic motor using the output working fluid supplied from the supply pipe to drive the front or rear wheel of a bicycle; and a pressure adjustment unit including a bypass pipe to connect both sides with the support pipe, and a pressure regulator installed on one side of the bypass pipe to control the opening degree of the bypass pipe.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a hydraulic drive unit and a bicycle equipped with a transmission,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a hydraulic drive apparatus having a pressure adjusting function and a bicycle equipped with a transmission, and more particularly to a bicycle capable of instantaneously obtaining a torque required by a combination of pressure regulation and speed change.

Bicycles are not only used as a means of transport but also as a means of leisure.

A generally used bicycle 10 is provided with a front wheel 1, a rear wheel 2 and a pedal 3 as shown in Fig. 1, and includes a power transmitting means 3 for transmitting the power of the pedal 3 to the rear wheel 2, And a chain (6) connecting the chain gears (4,5) and the chain gears (4,5) provided on the rear wheel (2) and the pedal shaft, and a frame (7) And a saddle 8 and a handle 9 provided on the frame 7.

The operating structure of the bicycle 10 is configured such that the chain gear of the pedal shaft rotated by the left and right pedals and the chain gear of the rear wheel shaft are interlocked with each other by the chain. When the pedaling force is applied to the pedal, .

However, the conventional bicycle 10 has a problem of power loss due to self-friction of the chain and friction between the chain and the chain gear, and there is a problem that the chain is loosened due to wear of the chain and the chain gear, Often occurs, the oil on the chain can get on the pants or shoes, and the speed is too low in uphill roads, which makes it difficult to operate.

In addition, the power transmission system of the bicycle 10 is connected to the gear and the chain, so that it requires the driving force of the shift lever when the gear is shifted and the gear can not be shifted instantaneously. It is not suitable for power transmission system.

Patent Registration No. 10-1769696 (Publication date 2017.08.18.) Japanese Patent Application Laid-Open No. 10-2017-0093194 (Publication date 2017.08.14.)

SUMMARY OF THE INVENTION An object of the present invention is to provide a hydraulic driving bicycle which is capable of facilitating and speeding up hydraulic shifting.

Another object of the present invention is to provide a hydraulic drive device of a pressure regulation function and a bicycle equipped with a transmission so as to instantaneously obtain a desired torque by a combination of pressure adjustment and speed change.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, A supply pipe for supplying the output hydraulic fluid by the hydraulic pressure generated by the hydraulic pressure unit; A hydraulic motor for driving a front wheel or a rear wheel of the bicycle using the output hydraulic fluid supplied from the supply pipe; A return pipe for collecting the output hydraulic oil used for the front wheel or the rear wheel drive, that is, the hydraulic oil passed through the hydraulic motor, to the hydraulic pressure unit; And a pressure regulator disposed on one side of the bypass pipe and configured to regulate a rate of opening of the bypass pipe, wherein the pressure regulator includes a bypass pipe connected to the supply pipe and the return pipe, And the output hydraulic fluid of the hydraulic pressure section is guided to the return pipe according to the opening ratio of the pass pipe to adjust the pressure of the output hydraulic fluid supplied to the hydraulic motor.

In the above bicycle, the supply pipe may further include an accumulator.

Further, a transmission may be further provided between the hydraulic motor and the front or rear wheels.

According to the present invention, the output hydraulic fluid of the hydraulic pressure section can be easily adjusted through the pressure adjusting section, instantaneous torque adjustment is possible, and the structure is simple, thereby reducing the installation cost.

In addition, the desired torque can be instantaneously obtained by the combination of the hydraulic pressure adjustment of the hydraulic drive unit and the shift change by the transmission.

1 shows a bicycle according to the prior art,
2 is a view showing a main configuration of a bicycle according to the present invention,
3 is a view showing a main configuration and a connection relationship of a bicycle according to the present invention,
4 is a view showing an example of a pressure adjusting section which is a main part of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated in the drawings and described in detail in the detailed description. The effects and features of the present invention and methods of achieving them will be apparent with reference to the embodiments described in detail below with reference to the drawings. However, the present invention is not limited to the embodiments described below, but may be implemented in various forms.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like reference numerals refer to like or corresponding components throughout the drawings, and a duplicate description thereof will be omitted .

A typical bicycle is driven by a sprocket on each axis of the rotating shaft and a rear wheel, and a power is transmitted by putting a chain on both sprockets. Such a driving method generates a mechanical friction loss and drives only the rear wheels, and the driving energy can not be stored. Therefore, interest in hydraulic driving bicycles has recently increased.

Hydraulic drive system The bicycle is equipped with a hydraulic pump unit and a hydraulic motor so that the hydraulic pump unit generates the hydraulic pressure by rotation of the pedal and the hydraulic pressure is transmitted to the hydraulic motor installed on the wheel. Therefore, there is no mechanical frictional resistance and the power can be transmitted to the front wheel and the rear wheel at the same time, and the hydraulic energy can be stored in the accumulator (accumulator) and then supplied to the hydraulic motor.

The present invention relates to such a hydraulically driven bicycle, and more particularly to a bicycle (hereinafter, referred to as a bicycle 100) equipped with a hydraulic pressure drive device and a transmission.

FIG. 2 is a schematic view showing a main configuration according to an embodiment of the bicycle 100, where the respective configurations are installed. Referring to FIG. 2, the main configuration of the bicycle 100 according to one embodiment is shown in FIG. The hydraulic pump 1 is connected to the rear wheel 2, the pedal 3, the hydraulic unit 20, the supply pipe 31, the return pipe 32, the hydraulic motor 40, the pressure regulator 50, the transmission 60, (70). The bicycle 100 includes a frame, a saddle, and a handle.

The hydraulic pressure unit 20 is configured to generate hydraulic pressure by the rotational force of the bicycle pedal 3 and may be provided inside the bicycle frame provided with the pedal rotation shaft or may be provided outside the bicycle frame provided with the pedal rotation shaft. In the former case, the hydraulic pressure unit 20 includes a left pedal crank arm, a right pedal crank arm, a crank mechanism, a drive gear, a driven gear, and a driven gear disclosed in Patent Publication No. 10-1769696 (see FIGS. 2 and [0021] to [0029] , A bracket, a combination of left and right drive piston rods, or a fluid pump disclosed in Japanese Patent Application Laid-Open No. 10-2017-0093194. In the latter case, the hydraulic pressure unit 20 may be a hydraulic pressure generating device disclosed in Japanese Patent Application Publication No. 10-0266468.

The supply pipe 31 is configured to supply the operating fluid of the hydraulic section 20 by the hydraulic pressure generated in the hydraulic section 20 to the hydraulic motor 40. The supply pipe 31 includes a hydraulic section 20 and a hydraulic motor 40, Which can also be installed inside or outside the bicycle frame.

The return pipe 32 is configured to recover the hydraulic oil used for driving the front wheel 1 or the rear wheel 2 to the hydraulic pressure unit 20 and both sides thereof are connected to the hydraulic pressure unit 20 and the hydraulic motor 40 . The return pipe 32 may also be installed inside or outside the bicycle frame like the supply pipe 31.

The hydraulic motor 40 is connected to the front wheel 1 or the rear wheel 2 of the bicycle 100 and drives the front wheel 1 or the rear wheel 2 with operating oil supplied from the supply pipe 31. [ The hydraulic motor 40 may be any one of a gear motor, a vane motor, and a piston motor. The gear motor is simple in structure, cheap in price, has few faults due to foreign matter in hydraulic oil, and can withstand relatively harsh operating conditions. On the other hand, the leakage amount is large, the torque fluctuation is large, the bearing load is large, and the service life is short. The vane motor is relatively simple in structure, has a small output torque fluctuation, is capable of forward rotation and reverse rotation, and is capable of continuously variable shifting. In addition, since the balance of the pressure acting on the loader is maintained, the bearing load is small and the contact of the vane cam ring is maintained, so that leakage does not increase. Piston motors generate high pressure, high speed, and large output, and are complicated in structure and expensive. Efficiency is the most excellent among hydraulic motors.

The pressure adjusting unit 50 includes a bypass pipe 51 and a pressure regulator 52. The hydraulic pipe 20 and the hydraulic motor 40 are connected to a supply pipe 31 and a return pipe 32. The bypass pipe 51 is disposed close to the hydraulic pressure unit 20 as shown in FIG. It is desirable to install it. This is to allow instantaneous adjustment when controlling the pressure of the hydraulic fluid delivered to the hydraulic motor 40. The pressure regulator 52 may be a kind of valve. Normally, the bypass pipe 51 is shut off. When the pressure adjustment is required, the bypass opening ratio is adjusted so that the hydraulic oil is guided to the return pipe 32, Part of the hydraulic pressure generated in the hydraulic pressure unit 20 is immediately returned to the hydraulic pressure unit 20 side. Accordingly, the pressure of the hydraulic fluid supplied to the hydraulic motor 40 can be reduced, thereby providing a gear shifting effect. The opening ratio adjustment can be configured so that the driver can manipulate the opening ratio by an operation unit (not shown) provided on the bicycle handle, so that the output of the hydraulic pressure generated in the hydraulic unit 20 can be easily controlled.

The transmission 60 is provided between the hydraulic motor 40 and the front wheel 1 or the rear wheel 2 and is a device for converting the rotational speed by a gear. That is, as a device for changing the rotational speed of the front wheel 1 or the rear wheel 2 by the hydraulic motor 40 to a desired rotational force, the speed ratio, which is the ratio between the input rotational speed and the output rotational speed, . The transmission 60 may also be configured to be operable by a driver by means of an operating portion (not shown) provided on the bicycle handle, such as the pressure regulator 52. On the other hand, the operation of the pressure regulator 52 and the transmission 60 is designed to be capable of wireless adjustment, and the operating portion of the handle is operable in the maximum speed, normal traveling speed and minimum speed mode, The convenience of the user can be increased by controlling the change of the regulator 52 and the transmission 60 simultaneously. That is, the user does not separately operate the pressure regulator 52 and the transmission 60 but provides the convenience of the user by providing the opening ratio of the pressure regulator 52 optimized for each mode and the gear shift of the transmission 60 can do.

The accumulator 70 is formed by pressurizing the high-pressure oil in the vessel and serves to temporarily accumulate the energy of the hydraulic oil of the hydraulic section 20. [ Since a momentary pressure rise is difficult due to the pressure generated in the hydraulic pressure unit 20 when instantaneous motion is required, a small amount of pressure energy is stored. When the motion is required intermittently or instantaneously, the pressure of the accumulator 70 Can be used. The accumulator 70 can absorb the surge pressure due to the fluctuation of the load and can remove the wave pressure of the hydraulic portion 20. [ Therefore, the pressure of the hydraulic pressure section 20 can be kept constant. A bladder type, a diaphragm type, a plunger type, a nonseparator type accumulator, and a separator type accumulator.

On the other hand, in order to prevent freezing of the working oil in winter, the hydraulic unit 20 may be provided with a heating means such as a heating wire. The heating means is configured to be operated by a power source such as an external auxiliary battery used in a smart phone.

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. This is possible.

Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined by the equivalents of the claims, as well as the claims.

100: Bicycle
1: front wheel
2: rear wheel
3: Pedal
20: Hydraulic section
31: Supply pipe
32: Recovery pipe
40: Hydraulic motor
50:
60: transmission
70: Accumulator

Claims (3)

A hydraulic pressure portion provided inside the bicycle frame, which generates hydraulic pressure by a rotational force of the bicycle pedal and is provided with a pedal rotation shaft;
A supply pipe for supplying the output hydraulic fluid by the hydraulic pressure generated by the hydraulic pressure unit;
A hydraulic motor for driving the rear wheel of the bicycle using the output hydraulic oil supplied from the supply pipe;
A return pipe for collecting the output hydraulic fluid used for the rear wheel drive, that is, the hydraulic oil passed through the hydraulic motor to the hydraulic pressure section;
And a pressure regulator provided at one side of the bypass pipe for regulating the opening ratio of the bypass pipe and operated by the wireless signal to adjust the opening rate, the bypass pipe being connected to the supply pipe and the return pipe, An adjusting unit;
A transmission provided between the hydraulic motor and the rear wheel and adapted to adjust a speed ratio that is a ratio between an input rotational speed provided from a hydraulic motor and an output rotational speed to be provided to a rear wheel, the adjustment of the speed ratio being adjusted by a wireless signal;
An operating portion provided on the bicycle handle for adjusting the pressure regulator and the transmission and simultaneously obtaining the required torque by a combination of pressure regulation and shift by operating the pressure regulator and the transmission at the same time so that the bicycle is at a predetermined speed;
And heating means provided on the hydraulic pressure unit to prevent freezing of the hydraulic oil,
The bypass pipe is installed close to the hydraulic pressure portion,
The output hydraulic fluid of the hydraulic pressure section is guided to the return pipe according to the opening ratio of the bypass pipe by the pressure regulator to adjust the pressure of the output hydraulic fluid supplied to the hydraulic motor,
Wherein the supply pipe is further provided with an accumulator.
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