Inspection device and inspection method for speed variator

1. An inspection method for a speed variator comprising a first gear and a second gear, the first gear comprising an adjacent first gear tooth and second gear tooth, and the second gear comprising a third gear tooth located between the first gear tooth and the second gear tooth, the inspection method comprising:

obtaining a first position of the first gear based on a contact between the first gear tooth and the third gear tooth;

driving the first gear to rotate in a first direction to bring the second gear tooth into contact with the third gear tooth;

obtaining a second position of the first gear based on the contact between the second gear tooth and the third gear tooth; and

determining a condition of the speed variator based on the first position and the second position.

2. The inspection method of claim 1 , wherein obtaining the second position of the first gear comprises:

obtaining a change amount of a driving torque or driving current of the first gear;

determining the second gear tooth being in contact with the third gear tooth according to the change amount and a threshold value of the change amount; and

obtaining the second position of the first gear based on the contact between the second gear tooth and the third gear tooth.

3. The inspection method of claim 1 , wherein obtaining the first position of the first gear comprises:

driving the first gear to rotate in a second direction counter to the first direction;

stopping driving when ensuring that upon a stop of the first gear and the second gear, the first gear tooth contacts the third gear tooth; and

obtaining the first position based on the contact between the first gear tooth and the third gear tooth.

4. The inspection method of claim 1 , wherein:

the first position and the second position has an angular difference, the angular difference is an angular travel distance within the first gear rotating idly.

5. The inspection method of claim 1 , wherein the speed variator further comprises a third gear, and a fourth gear, the third gear is configured to rotate together coaxially with the second gear, the third gear comprises an adjacent fourth gear tooth and fifth gear tooth, the fourth gear comprises a sixth gear tooth located between the fourth gear tooth and the fifth gear tooth, the inspection method further comprises:

obtaining a first position of the first gear based on a contact between the first gear tooth and the third gear tooth and a contact between the fourth gear tooth and the sixth gear tooth;

driving the first gear to rotate in a first direction to bring the second gear tooth into contact with the third gear tooth, and then or simultaneously, the fifth gear tooth into contact with the sixth gear tooth;

obtaining a second position of the first gear based on a contact between the fifth gear tooth and the sixth gear tooth; and

determining a condition of the speed variator based on the first position and the second position.

6. The inspection method of claim 5 , wherein obtaining the second position of the first gear comprises:

obtaining a change amount of a driving torque or driving current of the first gear;

determining the fifth gear tooth being in contact with the sixth gear tooth that occurs after or when the second gear tooth contacts the third gear tooth, according to the change amount and a threshold value of the change amount; and

obtaining the second position of the first gear based on the contact between the fifth gear tooth and the sixth gear tooth.

7. An inspection device for a speed variator wherein the speed variator comprises a first gear and a second gear, the first gear comprising an adjacent first gear tooth and second gear tooth, and the second gear comprising a third gear tooth located between the first gear tooth and the second gear tooth, the inspection device comprising:

a position obtainer configured to obtain a first position and a second position of the first gear;

a driver coupled to the position obtainer and configured to drive the first gear to rotate in a first direction; and

a processor coupled to the driver, the processor being configured to control the driver and determine a condition of the speed variator according to the first position and second position of the first gear, wherein:

the position obtainer obtains the first position of the first gear based on a contact between the first gear tooth and the third gear tooth and obtains the second position of the first gear based on a contact between the second gear tooth and the third gear tooth.

8. The inspection device of claim 7 , wherein:

the processor determines that the second gear tooth is in contact with the third gear tooth according to a change amount of a driving torque or driving current of the first gear and a threshold value of the change amount.

9. The inspection device of claim 7 , wherein:

the speed variator further comprises a third gear and a fourth gear;

the third gear is configured to rotate together coaxially with the second gear;

the third gear comprises an adjacent fourth gear tooth and fifth gear tooth;

the fourth gear comprises a sixth gear tooth located between the fourth gear tooth and fifth gear tooth;

the position obtainer obtains the first position of the first gear based on a contact between the first gear tooth and the third gear tooth, and a contact between the fourth gear tooth and the sixth gear tooth; and

the position obtainer obtains the second position of the first gear based on a contact between the second gear tooth and the third gear tooth and a contact between the fifth gear tooth and the sixth gear tooth.

10. The inspection device of claim 7 , wherein:

the first gear is coupled to a motor;

the inspection device further comprises a driver, the driver is coupled to the motor for driving the motor to rotate.