ELECTRIC VEHICLE TRANSMISSION APPARATUS AND METHOD FOR MAKING THE SAME

• US 20200132132A1
• Filed: 02/22/2019
• Published: 04/30/2020
• Est. Priority Date: 10/29/2018
• Status: Active Application

• Current Assignee: Industrial Technology Research Institute
• Original Assignee: Industrial Technology Research Institute
• Inventors: WU, MENG-RU, TSAO, CHIA, CHEN, PO-WEN, HUANG, LI-TE, TSENG, JUI-TANG
• Application Number:
  US16/282,632
• Publication Number:
  US 20200132132A1
• Time in Patent Office: Days
• CPC Class Codes: F16D 11/14 with clutching members movable only axially F16D11/02, F16D11/08 take precedence
• CPC Class Codes: F16D 2011/002 using an external and axially slidable sleeve for coupling the teeth of both coupling components together
• CPC Class Codes: F16D 2023/141 characterised by using a fork; Details of forks
• CPC Class Codes: F16D 23/04 with an additional friction clutch synchro rings per se F16D23/025
• CPC Class Codes: F16H 2061/0474 by smoothing engagement or release of positive clutches; Methods or means for shock free engagement of dog clutches for tooth butt situations F16H2061/047
• CPC Class Codes: F16H 2061/1272 the failing part is a part of the final output mechanism, e.g. shift rods or forks
• CPC Class Codes: F16H 2063/3093 Final output elements, i.e. the final elements to establish gear ratio, e.g. dog clutches or other means establishing coupling to shaft
• CPC Class Codes: F16H 2200/0021 specially adapted for electric vehicles
• CPC Class Codes: F16H 61/04 Smoothing ratio shift
• CPC Class Codes: F16H 61/0403 Synchronisation before shifting
• CPC Class Codes: F16H 63/304 the final output mechanisms comprising elements moved by electrical or magnetic force band brake actuating mechanisms F16H63/3003

Abstract

An electric vehicle transmission method includes the steps of: detecting a gear-shift command; judging if the gear-shift command is in conflict, if it is in conflict, then it returns back to the step of detecting the gear-shift command while if it is not in conflict, then proceeds to the next step; proceeding to a synchronized position, a dispelling fork drives a synchronizer to make the synchronizer move from the original gear position to a synchronized position, and the dispelling fork does not move within a synchronized time; and proceeding to a target position, the dispelling fork drives the synchronizer again to make the synchronizer move to the target gear position.

Claims

1. An electric vehicle transmission apparatus, comprising:

a transmission source;

a transmission shaft coupled with the transmission source;

a first-position gear furnished at the transmission shaft;

a second-position gear furnished at the transmission shaft;

a synchronizer being furnished at the transmission shaft is positioned between the first-position gear and the second-position gear;

a dispelling fork coupled with the synchronizer;

a dispelling fork power source coupled with the dispelling fork; and

a controlling unit electrically connected to the transmission source and the dispelling fork power source;

wherein, the dispelling fork drives the synchronizer to make the synchronizer move from an original gear position to a synchronized position, afterward, the dispelling fork dose not move at a synchronized time;

the dispelling fork drives the synchronizer again to make the synchronizer move to the target gear position where the original gear position is a first-position gear or a second-position gear and the target gear position is the second-position gear or the first-position gear.

2. The electric vehicle transmission apparatus as claimed in claim 1, wherein the dispelling fork power source is coupled with a screw and the screw is coupled with the dispelling fork.

3. The electric vehicle transmission apparatus as claimed in claim 1, wherein both the dispelling fork power source and the transmission source are motors.

4. The electric vehicle transmission apparatus as claimed in claim 1, wherein the synchronizer further comprising an engaging sleeve, a hub, a first synchronizing ring, a second synchronizing ring, a first tapered surface, a second tapered surface, a first gland and a second gland, the transmission shaft penetrates sequentially through first-position gear, the first tapered surface, the first synchronizing ring, the hub, the second synchronizing ring and the second tapered surface, where the first gland is furnished on the first tapered surface, the second gland is furnished on the second tapered surface, and the engaging sleeve is furnished at the hub.

5. The electric vehicle transmission apparatus as claimed in claim 4, wherein the internal part of the engaging sleeve is engaged with the external parts of both the first synchronizing ring and the second synchronizing ring while the internal part of the engaging sleeve is also engaged with both the external parts of the second gland and the first gland.

6. The electric vehicle transmission apparatus as claimed in claim 5, wherein the synchronizer further comprising a first friction ring set and a second friction ring set;

both the first friction ring set and the second friction ring set have a bushing ring and a friction ring respectively;

both the first tapered surface and the second tapered surface are furnished at the external part of the bushing rings respectively;

the friction rings are tightly combined with the transmission shaft.

7. The electric vehicle transmission apparatus as claimed in claim 5, wherein the synchronized position is the gap to be engaged where the synchronizing ring contacts the friction ring set, and the engaging sleeve is not engaged with the gland, and where the synchronized ring is a first synchronizing ring or the second synchronizing ring and the friction ring set is a first friction ring set or the second friction ring set, and the gland is a first gland or the second gland.

8. The electric vehicle transmission apparatus as claimed in claim 5, wherein the spline furnished at both the internal part of the engaging sleeve and at the external part of the hub can be slid along each other.

9. The electric vehicle transmission apparatus as claimed in claim 5, wherein the external teeth furnished at the external parts of the first synchronizing ring, the second synchronizing ring, the first gland and the second gland can be engaged with the spline of the engaging sleeve respectively.

10. The electric vehicle transmission apparatus as claimed in claim 1, wherein the synchronized time is 50 ms˜

500 ms.

11. An electric vehicle transmission method, comprising the following steps:

detecting a gear-shift command;

judging if the gear-shift command is in conflict, if it is in conflict, then it returns back to the step of detecting the gear-shift command while if it is not in conflict, then proceeds to the next step;

proceeding to a synchronized position, a dispelling fork drives the synchronizer to make the synchronizer move from the original gear position to a synchronized position and do not move at a synchronized time;

proceeding to a target position, the dispelling fork drives the synchronizer again to make the synchronizer move to a target gear position.

12. The electric vehicle transmission method as claimed in claim 11, further comprising of judging whether it is safe, if it is safe, the wheel rotating speed is the rotational speed generated by the engaged position gear of the corresponding target gear position, then proceeds back to the step of detecting the gear-shift command.

13. The electric vehicle transmission method as claimed in claim 12, further comprising of judging whether it is safe, if it is not safe, the dispelling fork drives the synchronizer to make it move away from the target gear position and proceeds to the step of judging whether the response has reached a setting number of times.

14. The electric vehicle transmission method as claimed in claim 13, further comprising of judging whether the number of response has reached a setting number of times, if the number of response given to the controlling unit does not achieve a setting number of times, then, proceeds back to step of going to a synchronized position.

15. The electric vehicle transmission method as claimed in claim 14, further comprising of judging whether the number of response has reached a setting number of times, if the number of response given to the controlling unit has achieved a setting number of times, then, proceeds to the step of giving an alarm to the driver.

16. The electric vehicle transmission method as claimed in claim 15, wherein the number of setting is at least one or two through twenty times.

17. The electric vehicle transmission method as claimed in claim 15, wherein the judged response is that the wheel rotating speed is not the rotating speed generated by the engaged position gear of the corresponding target gear position.

18. The electric vehicle transmission method as claimed in claim 15, wherein the control unit gives an alarm to the driver that the wheel rotating speed is not the rotational speed generated by the corresponding engaged position gear, and the alarm can be sound, light, or wireless message.

19. The electric vehicle transmission method as claimed in claim 11, wherein the synchronized time is 50 ms˜

500 ms.

20. The electric vehicle transmission method as claimed in claim 11, wherein the synchronized position is the gap to be engaged where a synchronizing ring contacts a friction ring set, and an engaging sleeve is not engaged with a gland, and where the synchronized ring is a first synchronizing ring or a second synchronizing ring while the friction ring set is a first friction ring set or the second friction ring set, and the gland is a first gland or a second gland.