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CN-224229191-U - Continuously variable transmission driving device

CN224229191UCN 224229191 UCN224229191 UCN 224229191UCN-224229191-U

Abstract

The utility model belongs to the technical field of speed changers, and relates to a continuously variable transmission device which comprises a shaft conical disc unit, a two-shaft conical disc unit, an annular transmission part used for transmission connection, an axial limiting part and a torsion unit, wherein the axial limiting part is fixedly connected with a shaft, in an assembly state, the axial limiting part is used for limiting the axial position of a shaft moving conical disc to prevent the axial force of a first elastic component from acting on the annular transmission part and realizing that the annular transmission part is positioned at the maximum working radius of the shaft conical disc unit, the torsion unit comprises a main torsion disc sleeved on the two shafts in an axial sliding and circumferential fixed mode, and in an installation state, the main torsion disc is used for providing forward rotating torque for a power source and providing pretightening force for the annular transmission part.

Inventors

  • ZENG LINGGANG

Assignees

  • 衍柱科技(重庆)有限公司

Dates

Publication Date
20260512
Application Date
20250519

Claims (10)

  1. 1. The continuously variable transmission device comprises a shaft cone disc unit, a two shaft cone disc unit, an annular transmission part and a first elastic component which is connected with a shaft sleeve, wherein the shaft cone disc unit comprises a shaft, a shaft fixed cone disc and a shaft movable cone disc which are coaxially arranged in a relative mode, the shaft fixed cone disc is fixedly sleeved with the shaft, the shaft movable cone disc is sleeved on the shaft in a circumferential fixed and axial sliding mode, the first elastic component is propped against the non-conical surface end of the shaft movable cone disc and provides thrust for the shaft movable cone disc, the two shaft cone disc unit comprises a two shaft fixed cone disc and a two shaft movable cone disc which are oppositely arranged in a conical surface mode, the two shaft fixed cone disc is sleeved on the two shaft in a manner of being capable of rotating mutually and being fixed in at least one axial direction, the two shaft movable cone disc is sleeved on the two shaft fixed cone disc in a circumferential fixed and axial sliding mode, and the shaft is connected with a power source. The axial limiting part is fixedly connected with a shaft, and in the assembled state, the axial limiting part prevents the axial force of the first elastic component from acting on the annular transmission part by limiting the axial position of the shaft moving cone disc and realizes that the annular transmission part is positioned at the maximum working radius of the shaft cone disc unit; The torsion unit comprises a main torsion disc sleeved on the two shafts in an axially sliding and circumferentially fixed mode; in the installation state, the main torsion disc is used for providing forward rotation torque for the power source and providing pretightening force for the annular transmission member.
  2. 2. The stepless speed change device according to claim 1, wherein the non-conical surface end face of the two-axis movable conical disc is provided with an auxiliary torsion disc and a main thrust disc, and the auxiliary torsion disc and the main thrust disc are fixedly connected with the two-axis movable conical disc in a coaxial manner.
  3. 3. The continuously variable transmission of claim 2, wherein said torsion unit further comprises a torsion roller and a third elastic member; The main torsion disc is arranged at one side of the non-conical surface end of the two-axis dynamic conical disc, and a main torsion inclined slope groove and an auxiliary torsion inclined slope groove which are symmetrically and uniformly distributed by taking the clamping torsion rolling bodies as centers are respectively arranged in the circumferential directions of the main torsion disc and the auxiliary torsion disc, and the main torsion inclined slope groove and the auxiliary torsion inclined slope groove are unidirectional inclined slope grooves which are raised from one end to the other end; and one end of the third elastic component is propped against the end surface of one side of the main torsion disc, which is away from the main torsion slope groove, and provides axial pressure towards the auxiliary torsion disc for the main torsion disc.
  4. 4. A continuously variable transmission according to claim 3, wherein at least 2 sets of auxiliary torsion ramp grooves and main torsion ramp grooves are provided which are uniformly distributed in a circumferential direction, and the torsion rolling bodies are provided at intermediate positions of the auxiliary torsion ramp grooves in an assembled state.
  5. 5. The stepless speed changer transmission device according to claim 4, further comprising a thrust unit arranged on the two shafts, wherein the thrust unit comprises a secondary thrust disc and a thrust rolling body, the secondary thrust disc is arranged on the non-conical surface side of the two shafts and is connected with the two shafts in a circumferentially fixed and axially movable mode, and the secondary thrust disc and the primary thrust disc are respectively provided with a secondary thrust slope groove and a primary thrust slope groove which are symmetrical with each other with the central clamping of the thrust rolling body as a center, so that axial thrust can be generated on the two shafts when the secondary thrust disc and the two shafts transmit torque, clamping force required by torque transmission of the annular transmission piece is formed, and axial stroke generated by mutual rotation between the secondary thrust disc and the two shafts is matched with axial stroke required by speed regulation of the two shafts.
  6. 6. The continuously variable transmission device as set forth in claim 5, wherein the thrust unit further comprises a second elastic component, the second elastic component is sleeved on the two shafts and is disposed on a side, far away from the two shafts, of the auxiliary thrust disk, so as to provide axial thrust to the auxiliary thrust disk in a direction toward the two shafts, and an end face, far away from the two shafts, of the auxiliary thrust disk is abutted against a third supporting seat fixedly connected with the two shafts.
  7. 7. The continuously variable transmission driving device as set forth in claim 6, wherein at least 2 sets of auxiliary thrust ramp grooves and main thrust ramp grooves are provided uniformly distributed along the circumferential direction of the auxiliary thrust disk, and the auxiliary thrust ramp grooves and the main thrust ramp grooves are each of a V-shaped ramp groove structure rising symmetrically from a low point to both ends.
  8. 8. A continuously variable transmission as claimed in claim 7, wherein in the installed state the thrust rolling bodies are disposed at the lowest point in the main thrust ramp groove, and the endless transmission member is located at the minimum working radius of the biaxial cone disc unit.
  9. 9. The continuously variable transmission driving device according to claim 8, wherein the elastic coefficient of the first elastic component is larger than that of the third elastic component, the elastic coefficient of the third elastic component is larger than that of the second elastic component, and the system pretightening force of the annular driving member, the one-shaft conical disc unit and the two-shaft conical disc unit is provided by the torsion unit in the assembled state.
  10. 10. The continuously variable transmission as recited in claim 9, wherein the angular extent of the secondary thrust ramp slot and the angular extent of the primary thrust ramp slot satisfy the relationship: In the above formula, i is a transmission speed ratio; The rolling working radius of the annular transmission piece on a shaft; The rolling working radius of the annular transmission piece on the two shafts is set; The friction coefficient between the annular transmission piece and the conical surface disc; the thrust ratio required for torque transfer between the primary and secondary shafts, Value and transmission speed ratio i are monotonically and inversely related The radius of rotation of the body around the two shafts; A continuously variable angle for the secondary thrust ramp slot and the primary thrust ramp slot; the thrust provided for the thrust unit is transferred to the efficiency of a shaft by the annular transmission.

Description

Continuously variable transmission driving device Technical Field The utility model belongs to the technical field of speed variators, and particularly relates to a continuously variable transmission device. Background The cone disc type stepless speed change transmission device establishes rolling friction transmission power by clamping annular transmission parts (metal belts, rubber belts and the like) through the conical surfaces of two pairs of cone discs and realizes speed regulation by changing the rolling radius of the annular transmission parts on the cone discs. The motorized power device of the vehicle is a development trend nowadays, and especially the market penetration rate of the motorized power device of the road vehicle is over 50%. The motor has low-speed constant torque output, larger overload capacity and excellent smoothness, the motor can normally output power which is 2 times of rated power within 1 minute, the motor is in a high-efficiency working condition interval within a range from rated rotation speed to 2 times of rated rotation speed, but after the rotation speed of the motor exceeds 2 times of rated rotation speed, the working efficiency of the motor is reduced, the manufacturing process becomes complicated, the material strength requirement is improved, the cost is increased, the reliability is reduced, the speed regulation control requirement of the speed change transmission system by taking the motor as a power source of a mechanical device is simpler compared with an internal combustion power source device, the transmission speed ratio is in a maximum state when higher wheel end torque is needed, the transmission speed ratio is in a minimum state when higher wheel end rotation speed is needed, a frequent and accurate active speed regulating system is not needed to improve the working efficiency of the power system, and in addition, the single-stage speed reducer still cannot better carry out heavy load and the use requirement of higher rotation speed for traffic tools such as commercial cargo and sports cars. In view of the above background, configuring a continuously variable transmission that can timely respond to power, has no power interruption, has no impact, does not need to be provided with a clutch and does not need to actively control speed regulation is a transmission technology that is urgently needed in the electric vehicle and machinery market. According to the above-mentioned requirements, publication No. CN117090910a proposes a conical disc type continuously variable transmission scheme capable of adaptively providing a clamping force and a speed-adjusting force, which provides the clamping force and the speed-adjusting force through a slope pressurizing mechanism of a driven shaft, thereby effectively simplifying the structure and reducing the cost. The scheme has the following problems that 1, if the pretightening force value of an active pressurizing spring group meets the requirement of transmitting large torque at a minimum speed ratio, when transmitting small and medium-section torque, the clamping force is excessive, so that the transmission efficiency is low and the service life is reduced; 2, if the active pressurizing spring pretightening force is designed by adapting to the transmission medium and small section torque, frequent speed regulation is caused in the process of transmitting medium and high section torque, the service life and transmission efficiency of the system are reduced, and the problem that the power system is damaged due to the fact that the rotating speed of the power system is out of range due to the fact that the speed ratio is increased is rapidly accelerated under the high-speed working condition (such as rotor damage and motor controller damage caused by overlarge counter electromotive force due to the fact that the rotating speed of a motor exceeds a limit), 3, the scheme discloses a buffer device for complex active control and a passive buffer device for the active pressurizing spring group, if the system pretightening force is met by arranging the spring group with a small enough yield coefficient, the problem that the mechanical efficiency is low and the service life is reduced due to the fact that the clamping force is excessive in the transmission medium and small section torque is avoided through a distance setting device, and in addition, the problem that the vibration impact is not normally used due to the fact that the abrasion, the inelastic elongation, the assembly and the like of a ring transmission part are caused, the problem that the vibration impact is not normally used when the power is caused when the power is transmitted, 4, the scheme discloses a buffer device for preventing the damage to the ring transmission part due to the fact that the damage impact caused by the fact that the complex active control is caused by the high rotating speed torque fluctuation, the ring transmission part is not controlled