JP3143255U - Sensing device for crank screw force used in auxiliary electric bicycles - Google Patents

Abstract

To provide a device that is sensitive to the screw force of a crank used in an auxiliary electric bicycle that is simple and capable of reading highly reliable screw force data.
A frame 4 of a mechanism is provided with measurement parts, a circuit, and sensitive means inside. The top shaft 2 is attached to the frame 4 of the mechanism, and both ends have bearings in the frame 4 of the mechanism and can move freely. The shaft bearing 5 is provided in the frame 4 of the mechanism and is connected to the frame 12 via the shaft bearing 5 to freely move the frame 4 of the mechanism. A hanging type fixing method is used for the frame 12 to prevent the frame 4 of the mechanism from being lowered. The shaft bearing 5 is directly above the top shaft 2, the vertical line passes through the two centers, and the shaft bearing 5 and the top shaft 2 are aligned. The elastic case 7 is placed between the frame 4 and the frame 12 of the mechanism and receives an acting force that causes the movement of the frame 4 of the mechanism. The sensitive device senses the electromotive force depending on the angle of movement of the mechanism frame 4.
[Selection] Figure 1

Description

  The present invention is a device that is sensitive to the screw force of a crank used in an auxiliary electric bicycle. The device is attached near the front axle of the electric bicycle rear wheel and the lower axis of the frame. The screw force generated by stepping on the footboard moves the frame outside the device. A stress corresponding to the moment of force is generated between the frame of the sensitive device with the correctly designed mechanical structure and the frame returns to the original position. While the frame is moving, a voltage or current message is generated by the deformation or pressure of the elastic material, and that signal becomes a signal that controls the sensitive device, thereby determining the magnitude of the driving power and assisting The purpose of driving can be fulfilled.

  The operation system of the auxiliary electric bicycle will be described. There is an electric motor with a high rotational speed, and that motor is the basis of auxiliary power. It assists those who ride the auxiliary electric bicycle to ride easily on difficult roads. The speed-down mechanism also slows the motor's output operating speed, thus increasing the relative output screw force. When the speed is reduced, the power of the motor and the stepping force of the rider are merged into the power mixing mechanism and transmitted to the chain gear, so that the auxiliary electric bicycle moves forward and the purpose of saving physical strength can be achieved.

  Since the output power of the motor can be adjusted according to the road conditions, a mechanism for measuring the treading force is added to the route that transmits the treading force, so that the force applied to the treadle by the rider is measured and measured. As a result, the output power of the motor can be controlled and the physical strength of the rider can be saved.

There are two types of auxiliary electric bicycles that can measure screw force. Type 1 is a type with a simple switch on the motor. When the screw force resulting from the stepping force exceeds a certain measured value, the motor is switched on. On the other hand, when the screw force resulting from the stepping force falls below the measured value, the motor is switched off. In Type 2, the motor adjusts the output power according to the magnitude of the screw force measured by the screw force measuring mechanism. The disadvantage of Type 1 is that the motor does not have enough power to provide the necessary assistance to the rider. The type 2 screw force measuring mechanism converts a deviation effect caused by a complicated planetary vehicle device set and a deviation of a difference in muscle position into a screw force measurement value. The aforementioned screw force measuring mechanism, for example, a bicycle screw force measuring device, is a combination of a planetary gear device set and a position difference measuring component, and when a rim of a planetary gear device element receives a large screw force, In conjunction with the movement, the magnetic element and the positional difference cause a relative positional difference between the measurement parts (see Patent Document 1). In addition, a component that measures the positional difference also generates a relative positional difference, and the electromotive force is sensed on the sensitive side of the component that measures the positional difference, and the electromotive force becomes a sensitive control signal. The signal activates power and can serve the purpose of power driving. However, the planetary gear set mechanism described above is expensive, and a large number of transmission parts are complicated.
At present, it is an important issue for the industry to provide a simple screw force sensing device and to significantly reduce the cost of the auxiliary electric bicycle.

Patent No. 092205249

  The main purpose of the present invention is to provide a simple screw force sensing device, using the original mechanical parts of the auxiliary electric bicycle and the moment of force naturally present inside the parts, and further measuring the moment of force. Make a mechanical structure that can.

  A second object of the present invention is to provide a screw force sensing device that can easily determine screw force data. Considering the components of the moment of force, make good use of the vertical and vertical arrangement of the shaft bearing and crank bearing, simply read the numbers of the crank screw force, and devise so that the treading force of both feet does not confuse reading the data .

The third object of the present invention is to provide a screw force sensing device capable of reading highly reliable screw force data. The screw force can be calculated by reading the voltage value of one measuring part to be fixed. The demerit that the reliability of the rotary continuous electrode is low can be cleared.
A fourth object of the present invention is to provide a screw force sensing device with a screw force measuring component that is difficult to get dirty. For waterproofing, the measurement component, circuit and screw force sensitive module are placed in the case.

  The present invention is a device that is sensitive to the screw force of a crank used in an auxiliary electric bicycle. The device can measure the screw force generated while riding the auxiliary electric bicycle, and can correctly control the output power of the electric motor that assists the motor based on the magnitude of the screw force.

  FIG. 1 is a view of a device for sensing a crank screw used in an auxiliary electric bicycle according to an embodiment of the present invention. FIG. 4 is a drawing when this embodiment is attached to an auxiliary electric bicycle. FIG. 1 shows an arrangement in which the position of the acting force F3 of the chain 3 is higher than that of the shaft center bearing. In order to prevent the problem that the foot crank 1 contacts the ground when the position of the frame 4 of the mechanism is too low, the arrangement state as shown in the drawing is ideal. When the stepping force of F1 is applied to the stepping plate of the foot crank 1, a broach F3 at the tangent to the chain gear 6 of the chain 3 is generated, and the frame 4 of the mechanism is also affected by the stepping force of F1, and the shaft bearing 4 It moves in the clockwise direction to the center, and further gives an acting force to the elastic member 7, which generates a reaction force F2. F1 generates a force moment τ1 with respect to the top shaft 2, and F2 generates a force moment τ2 with respect to the shaft bearing 5 in a direction opposite to τ1. F3 generates a moment τ3 of force in the direction opposite to τ1 with respect to the shaft bearing 5. Analyzing the moments of these forces by the force balance principle yields the following formula:

τ1 = F1 × L1 = F3 × (L4 + L3)
F3 × L4 + F2 × L2 = F1 × L1 = τ1
τ1 (L3 ÷ (L4 + L3)) = F2 × L2
τ1 = F2 × L2 × (L4 + L3) ÷ L3

FIG. 2 shows that the center of the shaft bearing 5 and the chain 3 are on the same straight line. The arrangement method is a special example. At the same time that the footplate of the foot crank 1 receives the stepping force F1, the frame 4 of the mechanism is also affected by the force F1, moves in the clockwise direction around the shaft bearing 5, and further exerts an acting force on the elastic member 7. The elastic case 7 generates a reaction force F2. F1 generates a moment of force τ1 with respect to the top shaft 2, and F2 generates a moment of force τ2 with respect to the shaft bearing 5 in a direction opposite to τ1. Analyzing the moments of these forces by the force balance principle yields the following formula:
τ1 = τ2 = F2 × L2 = F1 × L1

  As shown in the situation shown in FIG. 1, the moment τ 1 of the force generated by the tread plate against the central shaft 2 is the moment τ 2 of the force generated by the acting force F 2 of the elastic member 7 on the shaft bearing 5 and the broach of the chain 3 F3 is the sum of the moment τ3 of the force generated with respect to the shaft bearing 5.

  As shown in FIG. 2, the moment τ1 of the force generated by the tread plate with respect to the top shaft 2 is the moment τ2 of the force generated by the acting force F2 of the elastic member 7 on the shaft bearing 5. In other words, the moment τ1 of the force generated when the treadle is stepped on is such that the frame 4 of the mechanism moves in the clockwise direction around the shaft bearing 5, and the moment τ2 of the force that generates the acting force F2 of the elastic member 7 and the chain 3 The moment τ3 of the force generated by the broach (situation in FIG. 1) returns the frame 4 of the moved mechanism to the original position, and maintains the force balance state. A permanent magnet 8 extending downward and reaching the mechanism frame 4 is provided at a predetermined position between the elastic case 7 and the shaft bearing 5, and a hall generator 9 is provided at a predetermined position inside the mechanism frame. When the frame 4 of the mechanism is shaken, a relative position difference occurs between the hall generator 9 and the permanent magnet 8. The Hall generator 9 is sensitive to the electromotive force, and the electromotive force becomes a control signal for the sensitive device. The magnitude of the output power of the motor is determined by the signal, and the purpose of power driving is reached. For this implementation example, the mechanism frame 4 has its rear wheels close to the ends and uses a suitable suspension-type fixing method to the frame 12 (not shown in the figure) to prevent the mechanism frame 4 from lowering. . Further, even when the frame 4 of the mechanism is placed on the frame 12 and the top shaft 2 is attached directly above the shaft bearing 5, the effect of the present invention can be achieved and the purpose can be achieved.

  As shown in FIG. 3, there is also a method of using a pressure observer 11 for the above-described sensitive component. The pressure rod 10 is extended from the frame 12 into the frame 4 of the lower mechanism, and a pressure observer 11 is provided to be fixed to the inside of the mechanism frame 4. Pressure is applied to the pressure port and the control signal is responsive, thereby determining the amount of power output by the motor.

  When the bicycle is stepped on the tread board by the above technique, the top shaft 2 moves around the shaft bearing 5 together with the frame 4 of the mechanism, and the relative position between the permanent magnet 8 and the hall generator 9 is relatively high. As the position difference is generated or the pressure applied from the pressure rod 10 to the pressure port of the pressure observer 11 and the stepping force increases, the angle at which the mechanism frame 4 moves and the acting force F2 generated also increase. As the relative positional difference between the permanent magnet 8 and the Hall generator 9 and the pressure received by the pressure observer 11 increase, the motor is activated by the electrical signal from the Hall generator 9 and the pressure observer 11 to provide auxiliary power. provide.

From the above, the advantages of the present invention can be summarized as follows.
1. It is possible to make a mechanism structure that measures the moment of force by making good use of the moment of force that naturally exists between the original mechanism parts of the auxiliary electric bicycle. The structure is simple.

2. Considering the requirements for the moment of force, use the vertical vertical arrangement of the shaft center bearing 5 and the top shaft 2, and simply read the number of crank screw force so that the treading force of both feet does not confuse reading the data. Devise it.
3. The screw force can be calculated by reading the voltage value of a measuring part that does not rotate unless it moves. The demerit that the reliability of the rotary continuous electrode is low can be cleared.

4). A linear hall generator can be used to create a no-touch type screw force measurement system.
5. The structure is simple and there is no worry about getting dirty.
6). Measurement parts and circuits can be placed in the mechanism frame 4 to meet the requirements for waterproofing.

1 is a schematic diagram showing a device for sensing the screw force of a crank used in an auxiliary electric bicycle according to an embodiment of the present invention. FIG. 5 is a schematic view showing another arrangement of a device for sensing the screw force of a crank used in an auxiliary electric bicycle according to an embodiment of the present invention. FIG. 6 is a schematic diagram illustrating a screw force measurement of a device sensitive to a screw force of a crank used in an auxiliary electric bicycle according to another embodiment of the present invention. 1 is a schematic diagram illustrating a state in which a device for sensing a crank force used in an auxiliary electric bicycle according to an embodiment of the present invention is attached to the auxiliary electric bicycle.

Explanation of symbols

  1 step crank, 2 celestial shaft, 3 chain, 4 mechanism frame, 5 shaft bearing, 6 chain gear, 7 elastic case, 8 permanent magnet, 9 hall generator, 10 pressure rod, 11 pressure observer, 12 frame

Claims (5)

A mechanism frame, a crankshaft, a shaft bearing, an elastic body, and sensitive means;
The frame of the mechanism is equipped with various parts in it, with a waterproof function,
The crankshaft is attached to the center of the mechanism, and both ends of the crankshaft have bearings on the frame of the mechanism, and are supported rotatably in the bearing.
The shaft bearing is provided in the frame of the mechanism, and is connected to the frame via the shaft bearing, and uses a suspension type fixing method suitable for the frame. The mechanism frame swings around the shaft bearing as a fulcrum. It is supported movably, the shaft bearing is directly above the crankshaft, the vertical line passes through the two centers, the shaft bearing and the crankshaft are aligned,
The elastic body is placed between the frame of the mechanism and receives an acting force that causes movement of the frame of the mechanism.
The sensitive means is sensitive to the electromotive force depending on the angle of movement of the mechanism frame, and the electromotive force becomes a motor control signal.
Permanent magnets that extend downward and reach into the mechanism frame are provided at a predetermined position between the elastic body attached to the frame and the shaft bearing, and the hall generator is installed at a predetermined position inside the mechanism frame. Sensitivity to the screw force of the crank used in an auxiliary electric bicycle characterized in that an electromotive force is generated by the relative positional difference between the two, and the electromotive force can measure the magnitude of the moment of force. apparatus.   The apparatus according to claim 1, wherein the elastic body is a spring or a spring plate.   It is also a method using a pressure observation device. A pressure observation device (11) is provided to extend the pressure rod from the frame into the frame of the lower mechanism and fix it inside the mechanism frame. The auxiliary electric bicycle according to claim 1, wherein pressure is applied from the rod to the pressure port of the pressure observation device, and the control signal is responsive to determine the amount of electric power output from the motor. A device that responds to the torque of the crank.   The shaft center bearing is located directly under the top shaft, the vertical line passes through the center of the two, the shaft center bearing and the top shaft are in a straight line, and the mechanism frame may be mounted on the frame. A device for sensing the screw force of a crank used in the auxiliary electric bicycle according to claim 1.   2. The device according to claim 1, wherein the sensitive device operates the motor correctly together with the motor control system.

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