CN216717655U

CN216717655U - Non-contact phase difference type torque sensing device for moped

Info

Publication number: CN216717655U
Application number: CN202120705707.8U
Authority: CN
Inventors: 杜磊; 郑大松
Original assignee: Dachuan Electric Machinery Technology Jiangsu Co ltd
Current assignee: Dachuan Electric Machinery Technology Jiangsu Co ltd
Priority date: 2021-04-08
Filing date: 2021-04-08
Publication date: 2022-06-10
Anticipated expiration: 2031-04-08

Abstract

The utility model discloses a non-contact phase difference type torque sensing device, which comprises a middle shaft, a torsion bar, an output end, a sensor and at least two gratings, wherein the torsion bar is arranged on the middle shaft; the torsion bar is sleeved on the middle shaft, and one end of the torsion bar is connected with the output end; at least two gratings are arranged on the torsion bar at intervals respectively; and each grating is correspondingly provided with a sensor for detecting the phase difference between the gratings. Compared with the traditional phase difference sensor which adopts gears, the non-contact phase difference type torque sensing device of the utility model uses the grating to replace the gears, thus realizing non-contact measurement, high precision and simple and convenient signal transmission. Compared with a strain gauge type torque sensor, wireless power supply and wireless signal transmission are not needed, the technology is simplified, and the cost is lower. The utility model has wide application field and can perfectly fit various bicycles such as a bicycle with a front-mounted middle shaft sensor, a bicycle with a middle torque motor and a bicycle with a rear motor.

Description

Non-contact phase difference type torque sensing device for moped

Technical Field

The utility model relates to a torque sensing device, in particular to a non-contact phase difference type torque sensing device for a power-assisted bicycle.

Background

The most essential difference between the Electric bicycle and the Electric bicycle is that most of domestic Electric bicycles cancel the pedal design of the bicycle and become Electric motorcycles, namely Electric motorcycles, and the Electric bicycles simply use Electric power as a power source and completely replace manpower. The electric bicycle is in a hybrid operation mode of 'manpower + electric power', the addition of the electric power is not for replacing the manpower, but for reinforcing the manpower, so that the electric power cannot independently drive the vehicle to move forwards without stepping on the pedal. In addition, one of the biggest differences between the electric bicycle and the "electric motorcycle" is that the electric bicycle is almost identical to a bicycle in appearance. And after the power supply is cut off or the power supply is turned off, the electric bicycle becomes a common bicycle and can still be freely ridden.

The existing electric moped has the core component of a torque sensor, can detect the output torque of manpower, and then calls the output torque of a motor to assist the manpower. The criterion for judging whether a power auxiliary system is excellent enough is "whether the power output meets the strength requirement of the user". Manpower output is big, and power output improves correspondingly, and manpower output reduces, and power output also reduces correspondingly, and power always follows the change of manpower and linear change, just so can reach best power assistance when riding, and the maximize utilizes manpower and electric power simultaneously, lets the people ride and becomes relaxed, does not waste electric power simultaneously. However, because the torque sensor is assembled on the middle shaft, which is a rotating part, the torque sensor is difficult to realize in a form of connecting the sensor by wires. The strain gauge type torque sensor reacts the change of the trampled torque by acquiring the deformation on the torsion bar, but has the problems of complex technology and higher cost in the aspects of strain gauge pasting and signal transmission. In particular, wireless power supply and wireless signal transmission are required.

SUMMERY OF THE UTILITY MODEL

Utility model purpose: the utility model aims to provide a phase difference type torque sensing device which can realize non-contact transmission of torque signals and accurately measure distance at high rotating speed.

The technical scheme is as follows: the utility model relates to a non-contact phase difference type torque sensing device of a power-assisted bicycle, which comprises a middle shaft, a torsion bar, an output end, a sensor and at least two gratings, wherein the torsion bar is arranged on the middle shaft;

the middle shaft is used for being connected with the pedal and used as a power input end.

The torsion bar is sleeved on the middle shaft, and one end of the torsion bar is connected with the output end;

the at least two gratings are respectively arranged on the torsion bar at intervals;

and each two gratings are correspondingly provided with a sensor for detecting the phase difference between the gratings.

Further, the grating comprises an input side grating and an output side grating, and the input side grating is arranged on the connecting part of the torsion bar and the middle shaft; the output side grating is arranged on the connecting part of the torsion bar and the output end;

further, one side of the input side grating is provided with a spare grating.

Further, the output end comprises a clutch, a gear set and a toothed disc; one end of the clutch is connected with the torsion bar, the other end of the clutch is connected with the gear set, and the gear set is connected with the chain wheel.

Further, the output end comprises a chain wheel; the chain wheel is connected with the torsion bar.

Furthermore, a spline is arranged inside the torsion bar, a spline is also arranged outside the middle shaft, and the torsion bar is sleeved on the middle shaft and connected with the middle shaft through the spline.

Furthermore, a sensor retainer is arranged on the torsion bar, the torsion bar and the retainer can rotate relatively, and the sensor is arranged on the sensor retainer.

The motor front-mounted power-assisted bicycle is provided with the non-contact phase difference type torque sensing device.

A torque center motor assisted bicycle provided with the non-contact phase difference type torque sensing device.

The moped with the rear motor is provided with the non-contact phase difference type torque sensing device.

Has the advantages that: compared with the prior art, the utility model has the following remarkable advantages:

(1) compared with the traditional phase difference sensor which adopts gears, the non-contact phase difference type torque sensing device of the utility model uses the grating to replace the gears, thus realizing non-contact measurement, high precision and simple and convenient signal transmission.

(2) Compared with a strain gauge type torque sensor, wireless power supply and wireless signal transmission are not needed, the technology is simplified, and the cost is lower.

(3) The non-contact phase difference type torque sensing device has wide application field, and can perfectly fit various bicycles such as a bicycle with a front-mounted middle shaft sensor, a bicycle with a middle torque motor and a bicycle with a rear motor.

Drawings

FIG. 1 is a schematic structural view of a torque sensing device according to the present invention;

FIG. 2 is a perspective view of the torque sensing device of the present invention;

FIG. 3 is a cross-sectional view of the torsion bar and grating position relationship of the present invention;

FIG. 4 is a schematic diagram of a torque sensing device of the present invention employing three gratings.

Detailed Description

The technical scheme of the utility model is further explained by combining the attached drawings.

As shown in fig. 1 and fig. 2, the non-contact phase difference type torque sensing device of the present invention includes a central shaft 1, a torsion bar 4, an input side grating 5, an output side grating 3, an output end and a sensor 8; pedals are respectively arranged at two ends of the middle shaft 1 and are used as power input ends; as shown in fig. 2, the torsion bar 4 is divided into two parts, one part is connected with the middle shaft 1 through splines, and the other part is connected with the output end. An input side grating 5 is arranged on the part connected with the middle shaft 1, and an output side grating 3 is arranged on the part connected with the clutch 9 or other output parts. The sensor 8 is fitted to the input-side grating 5 and the output-side grating 3, and detects a phase difference between the input-side grating 5 and the output-side grating 3.

When the device is applied to the middle-placed motor, the output end comprises the clutch 9 and the gear set 2, power is transmitted to the gear set 2 through the clutch 9, and the gear set 2 is connected with the outer side chain wheel of the middle-placed motor to output the power. The clutch 9 transmits power to the outside in one way, and blocks external power from being transmitted to the middle shaft 1, so that the working of the pedal is not influenced, the middle shaft 1 rotates with the pedal, and a user is injured.

The working process of the utility model is as follows: the pedal is stepped on to the manpower, gives the axis with power transmission, because this moment torsion bar passes through splined connection with the axis, so this torsion bar transmits power again for the chain wheel, and then transmits to the chain and drives the vehicle.

When the device is applied to a middle-placed motor, the torsion bar transmits power to the clutch, then transmits the power to the gear set, further transmits the power to the chain wheel, and finally transmits the power to the power wheel through the chain.

When the torsion bar is driven, deformation occurs, signals acquired by gratings on the output side and the input side of the coding disc are asynchronous, specifically, a phase difference is generated, the phase difference is captured by the coding disc, and further a specific parameter is obtained, and the parameter can reflect the deformation condition of the torsion bar and convert the deformation condition into an electric signal for motor control.

When the pedal is stepped on, force is transmitted according to the sequence of a middle shaft, a torsion bar and an external output device (when the torsion bar is connected with a chain wheel, the chain wheel is connected with the inside of the middle-mounted motor in a clutch mode, and finally the force is transmitted to an external power wheel). At the moment, the torsion bar is deformed, the output side grating and the input side grating which are arranged on the torsion bar at intervals can rotate relatively, and the photoelectric signals on the two sides have phase difference so as to judge the magnitude of the treading force.

The torsion sensor is a torsion angle phase difference type sensor during phase difference, the principle of the torsion sensor is that two groups of gears with the same tooth number, shape and installation angle are installed at two ends of an elastic shaft only by studying a magnetoelectric phase difference type torque measurement technology, and a proximity sensor is installed at the outer side of each gear. When the elastic shaft rotates, the waveforms of the two groups of sensors generate phase difference, and therefore the torque is calculated. It features that the non-contact transmission of torque signal is realized, and the detected signal is digital signal and has high rotation speed. The torque is collected by utilizing the non-contact characteristic, and support is provided for motor control.

As shown in fig. 4, the sensors respectively collect the phase differences of the three gratings, and compare the phase differences with each other to obtain two adjacent difference values, so as to obtain whether the torque is uniformly distributed on the torsion bar or not and feed back whether the torsion bar is plastically deformed due to an excessive external force or not through the comparison of the difference values. The three gratings can be used and two gratings can be used for standby, and when one grating is damaged, the grating is opened, so that the normal operation of the equipment is ensured.

The specific application scenes of the sensor of the utility model include but are not limited to front-mounted and rear-mounted motor-assisted bicycles of a middle shaft sensor and torque-mounted motor-assisted bicycles.

Claims

1. A non-contact phase difference type torque sensing device of a power-assisted bicycle is characterized by comprising a middle shaft (1), a torsion bar (4), an output end, a sensor (8) and at least two gratings, wherein the torsion bar is arranged on the middle shaft;

the torsion bar (4) is sleeved on the middle shaft (1), and one end of the torsion bar (4) is connected with the output end;

the at least two gratings are respectively arranged on the torsion bar (4) at intervals;

and each two gratings are correspondingly provided with a sensor (8), and the sensors (8) are used for detecting the phase difference between the gratings.

2. The non-contact phase difference type torque sensing device according to claim 1, wherein the grating comprises an input side grating (5) and an output side grating (3), the input side grating (5) is disposed on a connection portion of the torsion bar (4) and the bottom bracket axle (1); the output side grating (3) is arranged on the connection part of the torsion bar (4) and the output end.

3. A non-contact phase difference type torque sensor for moped according to claim 2, characterized in that the input side grating (5) is provided with a spare grating (10) on one side.

4. The non-contact phase differential torque sensing device according to claim 1, wherein the output comprises a clutch (9), a gear set (2), and a crankset; one end of the clutch (9) is connected with the torsion bar (4), the other end of the clutch is connected with the gear set (2), and the gear set (2) is connected with the chain wheel.

5. The non-contact phase difference type torque sensor of claim 1, wherein the output comprises a chain wheel; the chain wheel is connected with the torsion bar (4).

6. A differential torque sensor device according to any of claims 1-5, wherein the torsion bar (4) is provided with splines inside, the middle shaft (1) is also provided with splines outside, and the torsion bars (4) are sleeved on the middle shaft (1) and connected with each other by the splines.

7. A non-contact phase difference type torque sensor for moped according to any one of claims 1-5, characterized in that the torsion bar (4) is provided with a sensor holder (7), the torsion bar (4) and the holder (7) can rotate relatively, and the sensor (8) is arranged on the sensor holder (7).

8. The moped with the preposed motor is characterized in that the moped is provided with the non-contact phase difference type torque sensing device.

9. The moped with the middle-arranged motor is characterized in that the moped is provided with the non-contact phase difference type torque sensing device.

10. The moped with the rear motor is characterized in that the moped is provided with the non-contact phase difference type torque sensing device.