CN111219466A - Symmetrical multi-cone-ring friction type automobile continuously variable transmission - Google Patents
Symmetrical multi-cone-ring friction type automobile continuously variable transmission Download PDFInfo
- Publication number
- CN111219466A CN111219466A CN201910150462.4A CN201910150462A CN111219466A CN 111219466 A CN111219466 A CN 111219466A CN 201910150462 A CN201910150462 A CN 201910150462A CN 111219466 A CN111219466 A CN 111219466A
- Authority
- CN
- China
- Prior art keywords
- bevel gear
- cone
- ring
- speed
- speed regulating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H37/00—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00
- F16H37/02—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00 comprising essentially only toothed or friction gearings
- F16H37/021—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00 comprising essentially only toothed or friction gearings toothed gearing combined with continuous variable friction gearing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H15/00—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by friction between rotary members
- F16H15/02—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by friction between rotary members without members having orbital motion
- F16H15/04—Gearings providing a continuous range of gear ratios
- F16H15/06—Gearings providing a continuous range of gear ratios in which a member A of uniform effective diameter mounted on a shaft may co-operate with different parts of a member B
- F16H15/16—Gearings providing a continuous range of gear ratios in which a member A of uniform effective diameter mounted on a shaft may co-operate with different parts of a member B in which the member B has a conical friction surface
- F16H15/18—Gearings providing a continuous range of gear ratios in which a member A of uniform effective diameter mounted on a shaft may co-operate with different parts of a member B in which the member B has a conical friction surface externally
Abstract
The invention relates to the field of automobile manufacturing, in particular to a symmetrical multi-bevel-ring friction type automobile continuously variable transmission, which comprises a large bevel gear, a small bevel gear, a sleeve, a bevel wheel shaft, a bevel wheel and a speed regulating ring, wherein the large bevel gear is connected with the small bevel gear through a shaft; the small bevel gears are uniformly distributed on the periphery of the large bevel gear in the circumferential direction, and are meshed with the large bevel gear; the sleeve is coaxial with the large bevel gear; the speed regulating ring is positioned in the sleeve and connected with the sleeve, and can transmit the rotating speed and the torque; the bevel wheel and the small bevel gear are both arranged on the bevel wheel shaft, and the small bevel gear transmits the torque to the bevel wheel; the conical pulley is positioned in the sleeve, an outer bus of the conical pulley is parallel to the axis of the speed regulating ring, and the inner wall of the speed regulating ring is in contact with the outer wall of the conical pulley; the speed regulation mechanism is fixedly connected with the speed regulation ring and used for enabling the speed regulation ring to axially move. On the basis of strong transmission capability, the invention also has the advantages of relatively small volume, good mechanical property, good reliability, long service life, difficult slipping, high transmission efficiency, compact structure, rapid and accurate speed regulation and the like.
Description
Technical Field
The invention relates to the field of automobile stepless speed change, in particular to a symmetrical multi-cone ring friction type automobile stepless speed changer.
Background
Continuously variable transmissions have undergone many generations of development since their inception at the end of the 19 th century. From the earliest rubber belt type continuously variable transmissions to the metal belt type continuously variable transmissions which are also mainstream in the current market, the metal belt type CVT has better force transmission performance and efficiency, but the application of the metal belt type CVT is still limited by the problems of large pressing force control difficulty, short service life of a metal belt, high cost, insufficient reliability and the like. In order to solve these problems, people start improvement and innovation from the principle of the continuously variable transmission, and design and manufacture an annular cone disc type continuously variable transmission IVT, an electronic continuously variable transmission ECVT, a cone ring type continuously variable transmission KRG and the like in succession.
The structure of cone ring type continuously variable transmission KRG is input cone pulley and output cone pulley opposition, and the generating line is parallel, and the speed governing ring is placed to the centre, and the speed governing process is the angle that changes the speed governing ring with the motor, changes the position of speed governing ring through derived axial force to change cone pulley contact radius, and then change the velocity ratio. The disadvantages of the conical ring type continuously variable transmission KRG are:
1. the occupied space is relatively large due to the fact that the speed regulating mechanism is arranged on one side;
2. the timeliness of speed regulation is not good enough;
3. the drive ring is unevenly stressed resulting in instability.
The Warko corporation designs and manufactures a cone ring type continuously variable transmission. The principle of the speed regulation ring is that the large cone pulley and the small cone pulley are designed to be curved surfaces, the curvature of the curved surface of the small cone pulley is small, the small cone pulley and the planetary gear shaft can swing radially, and speed regulation is realized through the change of the contact radius of the large cone pulley and the small cone pulley in the process of moving the speed regulation ring left and right. Its disadvantages are:
1. the requirements on design and processing are high by always ensuring the contact diameter to be constant;
2. moreover, point contact between the curved surfaces causes larger stress;
3. when the surface is subjected to shape change due to abrasion, automatic compensation cannot be performed, so that the transmission capability is weakened, and the performance becomes unreliable.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a symmetrical multi-cone-ring friction type automobile continuously variable transmission, wherein a cone pulley used in the transmission is a common frustum, the design and the processing are more convenient, an automatic pressurizing mechanism can compensate the gap generated by abrasion, the pressing force cannot be changed, and the working performance is more reliable.
The technical scheme for realizing the functions is as follows: a symmetrical multi-cone ring friction type automobile continuously variable transmission is characterized in that:
comprises a large bevel gear, a small bevel gear, a sleeve, a bevel wheel shaft, a bevel wheel and a speed regulating ring;
the number of the small bevel gears is at least two, the small bevel gears are circumferentially and uniformly distributed on the periphery of the large bevel gear, and the small bevel gears are meshed with the large bevel gear; the sleeve is coaxial with the large bevel gear; the speed regulating ring is positioned in the sleeve and connected with the sleeve, and can transmit the rotating speed and the torque;
the number of the bevel wheels is the same as that of the small bevel gears, and the bevel wheels correspond to the small bevel gears one by one; the bevel wheel and the small bevel gear are both arranged on the bevel wheel shaft, and the small bevel gear transmits the torque to the bevel wheel; the conical pulley is positioned in the sleeve, an outer bus of the conical pulley is parallel to the axis of the speed regulating ring, and the inner wall of the speed regulating ring is in contact with the outer wall of the conical pulley;
the speed regulation mechanism is in contact with the speed regulation ring surface and is used for enabling the speed regulation ring to axially move.
The automatic pressurizing mechanism is positioned in the cone pulley and used for tightly pressing the cone pulley inside the speed regulating ring to ensure that the inner wall of the speed regulating ring is in contact with the outer wall of the cone pulley;
the automatic pressurizing mechanism comprises a fixed loading disc, a rolling body, a floating loading disc and a pre-tightening spring; the fixed loading disc is axially fixed on the cone pulley shaft, the floating loading disc axially floats on the cone pulley shaft, and the outer walls of the fixed loading disc and the floating loading disc are in contact with the cone pulley, so that torque transmission can be realized; the rolling body is located between the fixed loading disc and the floating loading disc, one end of the pre-tightening spring is in contact with the floating loading disc, and the other end of the pre-tightening spring is in contact with the cone pulley.
Further, the speed regulating mechanism comprises a speed regulating shifting block, a lead screw, a speed reducer and a servo motor;
the speed regulation shifting block is in contact with the speed regulation ring and is connected with the screw rod through a roller screw nut.
Further, the number of the above-mentioned cone pulleys is preferably 2 to 4.
Furthermore, the number of the speed regulating mechanisms is equal to that of the cone pulleys, and the plurality of speed regulating mechanisms are uniformly distributed among the cone pulleys on the inner circumference of the speed regulating ring.
The invention has the advantages that:
1. the conical pulleys are uniformly distributed in the circumferential direction, so that the stress is uniform, the work is stable, the transmission capacity is high, the contact is linear contact, the mechanical property is good, and the sliding is not easy to occur;
2. the parts are arranged compactly, and the volume is relatively small;
3. the speed regulation mechanism driven by the uniformly distributed servo motors is adopted for speed regulation, so that the speed regulation is quick and accurate, and the timeliness is good;
4. the parts have simple appearance and structure, are convenient to design and process, and have lower cost, and the cone pulley used by the invention is a common frustum, so the design and the processing are more convenient;
5. the automatic pressurizing mechanism can ensure that the pressing force cannot change, and simultaneously compensate the gap generated by abrasion, so that the reliability of the mechanism is better.
Drawings
FIG. 1 is a view of a symmetrical multi-cone ring friction type continuously variable transmission for an automobile according to the present invention;
FIG. 2 is a schematic diagram of a speed control mechanism in a symmetrical multi-cone-ring friction type automobile continuously variable transmission according to the present invention;
3 FIG. 3 3 3 is 3 a 3 view 3 taken 3 along 3 line 3 A 3- 3 A 3 of 3 FIG. 3 1 3; 3
Fig. 4 is an extended example of the implementation of the present invention.
Wherein, 1, a sleeve; 2. a bevel wheel shaft; 3. a cone pulley; 4. fixing the loading disc; 5. a rolling body; 6. floating the loading disc; 7. a speed regulating ring; 8. a spring; 9. a bevel pinion gear; 10. a large bevel gear; 11. a speed regulation shifting block; 12. and a lead screw.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Referring to fig. 1, a novel cone ring type continuously variable transmission comprises a large bevel gear 10, a small bevel gear 9, a sleeve 1, a bevel wheel shaft 2, a bevel wheel 3 and a speed adjusting ring 7.
The number of the small bevel gears 9 is at least two, the small bevel gears 9 are circumferentially and uniformly distributed on the periphery of the large bevel gear 10, the small bevel gears 9 are meshed with the large bevel gear 10, and the small bevel gears 9 and the large bevel gear 10 form a planetary bevel gear for power coupling. The number of the small bevel gears 9 in the present embodiment is preferably 4; sleeve 1 is coaxial with large bevel gear 10, and sleeve 1 and large bevel gear 10 can be used as input output or output input, respectively.
The speed adjusting ring 7 is positioned in the sleeve 1 and connected with the sleeve 1, and can transmit the rotating speed and the torque, in the embodiment of the invention, the sleeve 1 is provided with an internal spline, the speed adjusting ring 7 is provided with an external spline, and the sleeve 1 and the speed adjusting ring 7 are matched with each other through the splines to transmit the rotating speed and the torque (see figure 3).
The number of the cone pulleys 3 is the same as that of the small bevel gears 9, and the cone pulleys correspond to one another; the bevel wheel 3 and the small bevel gear 9 are both arranged on the bevel wheel shaft 2, and the bevel wheel shaft 2 is fixed in the axial direction and can only rotate. The small bevel gear 9 transmits the torque to the bevel wheel 3; the cone pulley 3 is positioned in the sleeve 1, an outer generatrix of the cone pulley 3 is parallel to an axis of the speed regulating ring 7, and the inner wall of the speed regulating ring 7 is in contact with the outer wall of the cone pulley 3; when the cone pulley 3 rotates at a constant speed, the angular speed of the cone pulley 3 is constant, so that the linear speed is higher at the position with the larger radius. The linear velocity of the contact point of the conical pulley 3 is equal to that of the speed regulating ring 7, and the speed regulating ring 7 can slide on the surface of the conical pulley 3 through the speed regulating mechanism, so that the rotating speeds of the speed regulating ring 7 sliding to different radiuses of the conical pulley 3 are different, and the purpose of speed regulation is achieved.
The cone pulleys 3 are uniformly distributed in the speed regulating ring 7 in the circumferential direction. The large total pressing force can be provided under the condition of small pressing force of each cone pulley, so that the transmission capacity is improved, meanwhile, the contact stress of the cone pulley 3 and the surface of the speed regulating ring 7 is reduced, the service life of the stepless speed change mechanism is prolonged, and meanwhile, the failure risk is reduced.
Further, a speed regulating mechanism is also included, and referring to fig. 2, the speed regulating mechanism is in surface contact with the speed regulating ring 7 and is used for enabling the speed regulating ring 7 to axially move. The speed regulating mechanism comprises a speed regulating shifting block 11, a lead screw 12, a speed reducer and a servo motor; the speed regulation shifting block 11 is fixedly connected with the speed regulation ring 7, and the speed regulation shifting block 11 is connected with the lead screw 12 through a lead screw nut. The speed regulating mechanisms are uniformly distributed in the circumferential direction and form an included angle of 45 degrees with the conical pulley 3.
Further, the number of the speed regulating mechanisms is multiple, preferably 4 in the embodiment, and 4 speed regulating mechanisms are uniformly distributed on the inner circumference of the speed regulating ring 7.
Furthermore, the invention also comprises an automatic pressurizing mechanism which is positioned in the cone pulley 3 and used for tightly pressing the cone pulley 3 inside the speed regulating ring 7 and ensuring that the inner wall of the speed regulating ring 7 is contacted with the outer wall of the cone pulley 3.
The automatic pressurizing mechanism is a V-shaped groove automatic pressurizing mechanism and comprises a fixed loading disc 4, a rolling body 5, a floating loading disc 6 and a pre-tightening spring 8; the fixed loading disc 4 is axially fixed on the cone pulley shaft 2, the floating loading disc 6 axially floats on the cone pulley shaft 2, the rolling body 5 is positioned between the fixed loading disc 4 and the floating loading disc 6, one end of a pre-tightening spring 8 is in contact with the floating loading disc 6, and the other end of the pre-tightening spring is in contact with the cone pulley 3 and is used for providing initial pressing force. The fixed loading disc 4 and the floating loading disc 6 are connected with the cone pulley 3 through external splines and connected with the cone pulley shaft 2 through internal splines and used for transmitting rotating speed and torque.
The working principle of the invention is as follows:
(1) the large bevel gear 10 is used as input, the sleeve 1 is used as output, and the power transmission is as follows: as shown in fig. 1, a large bevel gear 10 rotates to drive a planetary small bevel gear 9 to rotate, the small bevel gear 9 drives a bevel wheel shaft 2 to rotate through a flat key, the bevel wheel shaft drives a V-groove automatic pressurizing mechanism to rotate through a spline, a fixed loading disc 4 is axially fixed on the bevel wheel shaft 2, torque is converted into axial pressure through a rolling element 5 in the V-groove and transmitted to a floating loading disc 6, so that a bevel wheel 3 is tightly pressed inside a speed regulating ring 7, the speed regulating ring 7 is driven to rotate through friction, and the speed regulating ring 7 drives a sleeve 1 to rotate through the spline, so that the rotating speed and the torque are output.
(2) The speed regulation principle is as shown in fig. 2, the speed regulation shifting block 11 is driven to axially translate through the lead screw pair 12, so that the speed regulation ring 7 is driven to axially translate, the contact position with the conical pulley 3 is changed, and the speed regulation effect is achieved.
In the invention, the number of the cone pulleys and the number of the speed regulating mechanisms which are uniformly distributed in the circumferential direction can be set according to the actual design transmission requirement and the arrangement space, and as shown in fig. 4, the cone pulleys are of a three-cone structure.
Claims (5)
1. The utility model provides a many awl rings of symmetry formula friction formula automobile continuously variable transmission which characterized in that:
comprises a large bevel gear (10), a small bevel gear (9), a sleeve (1), a bevel gear shaft (2), a bevel gear (3) and a speed regulating ring (7);
the number of the small bevel gears (9) is at least two, the small bevel gears are circumferentially and uniformly distributed on the periphery of the large bevel gear (10), and the small bevel gears (9) are meshed with the large bevel gear (10); the sleeve (1) is coaxial with the large bevel gear (10); the speed regulating ring (7) is positioned in the sleeve (1), is connected with the sleeve (1) and can transmit the rotating speed and the torque;
the number of the cone pulleys (3) is the same as that of the small cone gears (9), and the cone pulleys correspond to the small cone gears one by one; the bevel wheel (3) and the small bevel gear (9) are both arranged on the bevel wheel shaft (2), and the small bevel gear (9) transmits torque to the bevel wheel (3); the cone pulley (3) is positioned in the sleeve (1), an outer generatrix of the cone pulley (3) is parallel to the axis of the speed regulating ring (7), and the inner wall of the speed regulating ring (7) is in contact with the outer wall of the cone pulley (3);
the speed regulation mechanism is in surface contact with the speed regulation ring (7) and is used for enabling the speed regulation ring (7) to axially move.
2. The symmetrical multi-cone ring friction type continuously variable transmission for automobiles according to claim 1, wherein: the automatic pressurization mechanism is positioned in the cone pulley (3) and used for tightly pressing the cone pulley (3) inside the speed regulation ring (7) and ensuring that the inner wall of the speed regulation ring (7) is in contact with the outer wall of the cone pulley (3);
the automatic pressurizing mechanism comprises a fixed loading disc (4), a rolling body (5), a floating loading disc (6) and a pre-tightening spring (8); the fixed loading disc (4) is axially fixed on the cone pulley shaft (2), the floating loading disc (6) axially floats on the cone pulley shaft (2), and the outer walls of the fixed loading disc (4) and the floating loading disc (6) are in contact with the cone pulley (3) so as to realize torque transmission; the rolling body (5) is positioned between the fixed loading disc (4) and the floating loading disc (6), one end of the pre-tightening spring (8) is in contact with the floating loading disc (6), and the other end of the pre-tightening spring is in contact with the cone pulley (3).
3. The symmetrical multi-cone ring friction type continuously variable transmission for automobiles according to claim 1, wherein: the speed regulating mechanism comprises a speed regulating shifting block (11), a lead screw (12), a speed reducer and a servo motor;
the speed regulation shifting block (11) is in contact with the speed regulation ring (7), and the speed regulation shifting block (11) is connected with the screw rod (12) through a roller screw nut.
4. The symmetrical multi-cone ring friction type continuously variable transmission for automobiles according to claim 1, wherein: the number of the cone pulleys (3) is 2-4.
5. A symmetrical multi-cone ring friction automotive continuously variable transmission as claimed in claim 3, wherein: the number of the speed regulating mechanisms is equal to that of the cone pulleys (3), and the plurality of speed regulating mechanisms are uniformly distributed among the cone pulleys (3) on the inner circumference of the speed regulating ring (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910150462.4A CN111219466A (en) | 2019-02-28 | 2019-02-28 | Symmetrical multi-cone-ring friction type automobile continuously variable transmission |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910150462.4A CN111219466A (en) | 2019-02-28 | 2019-02-28 | Symmetrical multi-cone-ring friction type automobile continuously variable transmission |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111219466A true CN111219466A (en) | 2020-06-02 |
Family
ID=70825702
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910150462.4A Pending CN111219466A (en) | 2019-02-28 | 2019-02-28 | Symmetrical multi-cone-ring friction type automobile continuously variable transmission |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111219466A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3688594A (en) * | 1970-11-13 | 1972-09-05 | Bernhard Weber | Infinitely variable transmission |
| CN101550995A (en) * | 2009-05-25 | 2009-10-07 | 孔劲松 | Stepless speed change device of circularly arranged cone pulleys |
| CN102817985A (en) * | 2012-09-01 | 2012-12-12 | 郭克亚 | Long-cone rolling-cone type continuously-variable transmission mechanism |
| CN106090161A (en) * | 2016-06-23 | 2016-11-09 | 西安交通大学 | The middle servo conical pulley variable-speed device with the little friction pulley that can move along a straight line |
| CN108679181A (en) * | 2018-07-12 | 2018-10-19 | 上海欣原汽车技术开发有限公司 | A kind of cone Belt-type Adjustable-speed Drive device |
-
2019
- 2019-02-28 CN CN201910150462.4A patent/CN111219466A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3688594A (en) * | 1970-11-13 | 1972-09-05 | Bernhard Weber | Infinitely variable transmission |
| CN101550995A (en) * | 2009-05-25 | 2009-10-07 | 孔劲松 | Stepless speed change device of circularly arranged cone pulleys |
| CN102817985A (en) * | 2012-09-01 | 2012-12-12 | 郭克亚 | Long-cone rolling-cone type continuously-variable transmission mechanism |
| CN106090161A (en) * | 2016-06-23 | 2016-11-09 | 西安交通大学 | The middle servo conical pulley variable-speed device with the little friction pulley that can move along a straight line |
| CN108679181A (en) * | 2018-07-12 | 2018-10-19 | 上海欣原汽车技术开发有限公司 | A kind of cone Belt-type Adjustable-speed Drive device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101550995B (en) | Stepless speed change device of circularly arranged cone pulleys | |
| CN201111572Y (en) | Reducing type mechanical stepless speed changer | |
| GB996933A (en) | Improvements in and relating to infinitely variable conical disk transmissions | |
| CN106090161A (en) | The middle servo conical pulley variable-speed device with the little friction pulley that can move along a straight line | |
| CN111677821A (en) | Gear drive stepless speed changer | |
| US3802295A (en) | Variable speed transmission | |
| JPS6131761A (en) | Infinitely variable gear | |
| CN111219466A (en) | Symmetrical multi-cone-ring friction type automobile continuously variable transmission | |
| CN108001216B (en) | Electric automobile power assembly based on continuously variable transmission | |
| CN108533709A (en) | Idler wheel drive stepless speed changing case | |
| CN108533700B (en) | Continuously variable transmission | |
| KR20130110032A (en) | Continuously variable transmission | |
| CN209943450U (en) | Stepless speed variator | |
| CN109555828B (en) | Rolling type continuously variable transmission | |
| CN112377584A (en) | Friction type mechanical stepless speed changer | |
| US4026166A (en) | Traction drive | |
| CN111255866A (en) | Chain transmission stepless speed change device | |
| EP2716936A1 (en) | Transmission mechanism for friction planetary continuous variable transmission | |
| CN216200230U (en) | Novel stepless speed change device | |
| CN114233847B (en) | Speed regulating mechanism of continuously variable transmission and continuously variable transmission | |
| CN102252075A (en) | Friction pair planet driven continuously variable transmission | |
| CN111156301B (en) | Coaxial multilayer multi-stage intelligent speed change system suitable for electric two-wheeled vehicle | |
| CN112377583A (en) | Steel ball cone pulley type stepless speed changer | |
| CN218440486U (en) | Differential stepless variable-torque transmission | |
| CN108506447B (en) | Continuously variable transmission |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |