CN114877042A - Slip-free continuously variable transmission - Google Patents

Slip-free continuously variable transmission Download PDF

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Publication number
CN114877042A
CN114877042A CN202210572819.XA CN202210572819A CN114877042A CN 114877042 A CN114877042 A CN 114877042A CN 202210572819 A CN202210572819 A CN 202210572819A CN 114877042 A CN114877042 A CN 114877042A
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CN
China
Prior art keywords
disc
driven
driving
shaft
variable transmission
Prior art date
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Pending
Application number
CN202210572819.XA
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Chinese (zh)
Inventor
田祖织
吴向凡
谢方伟
季锦杰
唐宇洁
黄咸康
郭阳阳
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China University of Mining and Technology CUMT
Xuzhou University of Technology
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China University of Mining and Technology CUMT
Xuzhou University of Technology
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Application filed by China University of Mining and Technology CUMT, Xuzhou University of Technology filed Critical China University of Mining and Technology CUMT
Priority to CN202210572819.XA priority Critical patent/CN114877042A/en
Publication of CN114877042A publication Critical patent/CN114877042A/en
Pending legal-status Critical Current

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    • 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
    • F16H15/01—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by friction between rotary members characterised by the use of a magnetisable powder or liquid as friction medium between the rotary members
    • 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
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/66—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing specially adapted for continuously variable gearings
    • F16H61/664—Friction gearings

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Friction Gearing (AREA)

Abstract

The invention provides a non-slip continuously variable transmission, which comprises a shell, a driving shaft, a driven shaft, a driving disc and a driven disc, wherein the driving disc and the driven disc are conical; the driving shaft and the driven shaft are respectively and fixedly arranged at the central positions of the driving disc and the driven disc in a corresponding axial direction, and the driving disc and the driven disc are parallelly staggered by at least a distance more than a radius and have a working gap between the driving disc and the driven disc; the driving shaft and the driven shaft are arranged on the shell through bearings; the shell is internally provided with magnetorheological fluid, magnetic poles capable of moving along the radial direction of the driving disc and the driven disc are arranged on two sides of the staggered and overlapped part of the driving disc and the driven disc, and the magnetic poles are connected with a fixedly arranged magnet exciting coil. The invention adopts a non-coaxial transmission mode of the driving shaft and the driven shaft, and solves the problem of heat generation in the process of the magnetorheological fluid stepless transmission. The driving disc and the driven disc are in a conical disc structure, the slidable magnetic poles adjust the curing position of the magnetorheological fluid in the working gap, the transmission ratio between the driving part and the driven part is continuously adjusted, and the accurate adjustment and control of the magnetorheological fluid stepless transmission speed are realized.

Description

Slip-free continuously variable transmission
Technical Field
The invention relates to the field of magnetorheological speed regulation, in particular to a slip-free continuously variable transmission.
Background
The traditional liquid viscosity transmission utilizes the viscosity of liquid or the shearing action of an oil film to transmit power, generally adopts working liquid such as lubricating oil, silicone oil, hydraulic transmission oil and other Newtonian fluids, and generally adopts a method for adjusting the thickness of the oil film and the shearing area of the oil film to adjust the speed. The application of the magnetorheological fluid is rapidly developed in the last decade, and the engineering application performance of the magnetorheological effect is further improved, so that the magnetorheological fluid can be well applied to the field of transmission. The magnetorheological fluid is an intelligent material with excellent performance, and mainly comprises ultramicro metal soft magnetic particles (0.1 micron-10 microns) with high magnetic conductivity and low magnetic hysteresis, a surfactant and a base carrier fluid. The intelligent material has unique magneto-rheological effect, namely, the intelligent material is in a free flowing state when no external magnetic field acts; under the action of an external magnetic field, the soft magnetic particles form a chain structure with shearing strength along the direction of the magnetic field, the soft magnetic particles are instantly changed from a liquid state to a semi-solid state or a quasi-solid state, and the hardening degree of the soft magnetic particles can be continuously adjusted according to the intensity of the magnetic field. Therefore, the magnetorheological fluid has wide application in the field of mechanical transmission.
For example, when the conventional dual magnetorheological fluid speed regulator with the authorization publication number of CN101793312A is used for speed regulation, slip differential heating is inevitable, but due to the narrow working temperature range of the magnetorheological fluid (usually-40 ℃ to 130 ℃), an over-temperature phenomenon is very likely to occur during the operation process, which leads to the reduction of the mechanical properties and irreversible thickening, even failure, and severely restricts the practical application and rapid popularization of the magnetorheological fluid speed regulator. At present, the heat is mainly radiated by air cooling or water cooling and the like, the effect is difficult to meet the actual use requirement, and the problem of heat generation of a working area in the transmission process cannot be fundamentally solved. Therefore, how to quickly dissipate heat is always a bottleneck problem to be solved urgently in the research of the magnetorheological fluid transmission technology (especially in speed regulation application occasions).
Disclosure of Invention
To solve the above problems, the present invention provides a slip-free continuously variable transmission. The invention adopts the driving shaft and the driven shaft in a non-coaxial line transmission form, greatly reduces the slip power in the transmission process compared with the traditional dual magnetorheological fluid speed regulator, fundamentally solves the problem of heat generation in the stepless transmission process of the magnetorheological fluid, and realizes the power transmission without slip basically. Meanwhile, the driving disc and the driven disc are arranged to be in conical disc structures, and the transmission ratio between the driving part and the driven part is continuously adjusted by a method of adjusting the curing position of the magnetorheological fluid in the working gap through the slidable magnetic pole, so that the accurate regulation and control of the stepless transmission speed of the magnetorheological fluid are realized.
In order to realize the technical purpose, the technical scheme of the invention is as follows: a non-slip continuously variable transmission comprises a shell, a driving shaft, a driven shaft, a driving disc and a driven disc, wherein the driving disc and the driven disc are conical; the driving shaft and the driven shaft are respectively and fixedly arranged at the central positions of the driving disc and the driven disc in a corresponding axial direction, the driving disc and the driven disc are parallelly staggered for at least a distance more than a radius, and a working gap is formed between the driving disc and the driven disc; the driving shaft and the driven shaft are arranged on the shell through bearings; magnetorheological fluid is arranged in the shell, magnetic poles capable of moving along the radial direction of the driving disc and the driven disc are arranged on two sides of the staggered and overlapped position of the driving disc and the driven disc, and the magnetic poles are connected with the fixedly arranged magnet exciting coils and are used for forming sliding magnetic fields on the surfaces of the driving disc and the driven disc so as to solidify the magnetorheological fluid at different positions of a working gap and further adjust the transmission ratio of the driving shaft and the driven shaft.
Furthermore, the driving discs and the driven discs are arranged on the driving shaft and the driven shaft in at least two groups, and isolation sleeves are arranged between adjacent driving discs and adjacent driven discs.
Furthermore, the driving disc and the driven disc are made of magnetic conductive materials, and the isolation sleeve is made of magnetic isolation materials and used for ensuring that magnetic lines of force vertically penetrate through the working gap under the condition that the magnetic poles move.
Furthermore, key grooves are formed in the driving shaft and the driven shaft, and the driving disc, the driven disc and the isolation sleeve are arranged on a flat key matched with the key grooves and fixedly connected with the driving shaft, the driven shaft and the driven shaft.
Further, the excitation coil is fixed on the shell through a bolt and is electrically connected with an excitation power supply to provide a stable and reliable external magnetic field.
Furthermore, the magnetic pole is connected with a screw type linear pushing mechanism for driving the magnetic pole to move.
Furthermore, the section of the edge of the driving disc and the section of the edge of the driven disc are both trapezoidal.
The invention has the beneficial effects that:
the invention adopts the driving shaft and the driven shaft in a non-coaxial line transmission form, greatly reduces the slip power in the transmission process compared with the traditional dual magnetorheological fluid speed regulator, fundamentally solves the problem of heat generation in the stepless transmission process of the magnetorheological fluid, and realizes the power transmission without slip basically. Meanwhile, the driving disc and the driven disc are arranged to be in conical disc structures, and the transmission ratio between the driving part and the driven part is continuously adjusted by a method of adjusting the curing position of the magnetorheological fluid in the working gap through the slidable magnetic pole, so that the accurate regulation and control of the stepless transmission speed of the magnetorheological fluid are realized.
Drawings
FIG. 1 is a schematic illustration of the transmission principle of the present invention;
FIG. 2 is a schematic view of the cone pulley drive operating area of the present invention;
FIG. 3 is a schematic diagram of the variation of the working spacing of the conical disk drive of the present invention in different cross sections;
fig. 4 is a schematic structural diagram of a non-slip continuously variable transmission of the present invention.
In the figure: the device comprises a driving shaft 1, a shell 2, a driven shaft 3, a driven disc 4, a driven isolation sleeve 5, a bearing 6, a magnetic pole 7, a magnet exciting coil 8, a linear pushing mechanism 9, a driving disc 10, magnetorheological fluid 11 and a driving isolation sleeve 12.
Detailed Description
The technical solution of the present invention will be clearly and completely described below. It should be noted that, for the sake of clear determination of the positional relationship of the components of the present invention, the directions of up, down, left, right, two sides, etc. described in the present invention are all used for the position in fig. 1, and are not to be understood as the limitation of the present invention.
A kind of non-slip stepless speed change device, including the body 2, driving shaft 1, driven shaft 3, driving disk 10 and driven disk 4 of the conical disk; as shown in fig. 1, the driving shaft and the driven shaft are respectively and fixedly installed at the central positions of the driving disc and the driven disc in a corresponding axial direction, the driving disc and the driven disc are parallelly dislocated for at least a distance (h is slightly larger than R) above a radius R, a working gap exists between the driving disc and the driven disc, and the driving shaft and the driven shaft are parallel and are not coaxial; the driving shaft and the driven shaft are arranged on the shell through bearings.
Magnetorheological fluid 11 is arranged in the shell, magnetic poles capable of moving along the radial direction of the driving disc and the driven disc are arranged on two sides of the staggered and overlapped position of the driving disc and the driven disc, and the magnetic poles are connected with fixedly arranged magnet exciting coils and used for forming sliding magnetic fields on the surfaces of the driving disc and the driven disc so as to solidify the magnetorheological fluid at different positions of a working gap, further adjust the transmission ratio of the driving shaft and the driven shaft, adjust exciting currents in the magnet exciting coils so as to change the intensity of an external magnetic field, and realize that the driving cone disc drives the driven cone disc to rotate in a stepless mode.
As shown in fig. 3, in the overlapping area of the master and slave discs, the distances between the conical discs are different, but the distance on the plane where the master and slave axes are located is the minimum (i.e. on the motion line of the sliding magnetic pole in the invention), so that the magnetic field is accumulated on the line and is not dispersed, and the power transmission is realized; corresponding to the cross section of the positions (i) - (iv) in fig. 2, it can be seen in fig. 3 that the closer to the center line of the two conical disks, the smaller the working distance; therefore, the sliding magnetic pole is positioned on the central line of the two conical disks to obtain larger transmission torque and higher transmission efficiency.
Furthermore, the driving discs and the driven discs are arranged on the driving shaft and the driven shaft in at least two groups, and isolation sleeves are arranged between adjacent driving discs and adjacent driven discs.
Furthermore, the driving disc and the driven disc are made of magnetic conductive materials, and the isolation sleeve is made of magnetic isolation materials and used for ensuring that magnetic lines of force vertically penetrate through the working gap under the condition that the magnetic poles move.
As an embodiment of the present invention, as shown in fig. 4, a total of 9 driving discs are provided, each driving disc is isolated by a driving isolation sleeve 12, a total of 8 driven discs are provided, and each driven disc is isolated by a driven isolation sleeve 5; when the magnetorheological fluid curing device works, the driving shaft 1 is connected with a prime motor through a flat key, the driving disc 10 rotates along with the driving shaft 1, an adjustable magnetic field is applied to the magnetorheological fluid 11 in the working gap to cure the magnetorheological fluid at the position, so that the driven disc 4 is driven to rotate, and finally, the power is output through the driven shaft 3. In the transmission process, the linear pushing mechanism 9 can adjust the sliding magnetic poles 7 to be pushed to different positions towards two sides to solidify the magnetorheological fluid at different positions of a working gap, the transmission ratio between a main part and a driven part is continuously adjusted, the excitation current in the excitation coil can be adjusted to change the intensity of the external magnetic field, the stepless speed change without the slip difference basically is realized, the problem of heat generation in the stepless transmission process of the magnetorheological fluid is fundamentally solved, the transmission efficiency is improved, and the application range of the magnetorheological stepless speed regulator is effectively expanded.
Furthermore, key grooves are formed in the driving shaft and the driven shaft, and the driving disc, the driven disc and the isolation sleeve are arranged on a flat key matched with the key grooves and fixedly connected with the driving shaft, the driven shaft and the driven shaft.
Further, the excitation coil is fixed on the shell through a bolt and connected with an excitation power supply to provide a stable and reliable external magnetic field. All parts of the shell 2 are also connected through bolts, and a sealing gasket is arranged to ensure the sealing performance of the speed regulator;
furthermore, the magnetic pole is connected with a screw type linear pushing mechanism for driving the magnetic pole to move. As an embodiment of the present invention, the linear moving mechanism 9 is an electrically driven screw mechanism and is fixed on the housing 2 through a bolt, and can move to different positions to two sides and form a sliding magnetic field on the surface of the conical disc to solidify the magnetorheological fluid at different positions of the working gap.
Furthermore, the sections of the edges of the driving disc and the driven disc are both trapezoidal, and the overall safety is improved after the top removing treatment.
It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the inventive concept thereof, and these changes and modifications can be made without departing from the spirit and scope of the invention.

Claims (7)

1. A non-slip continuously variable transmission is characterized by comprising a shell, a driving shaft, a driven shaft, a driving disc and a driven disc, wherein the driving disc and the driven disc are conical; the driving shaft and the driven shaft are respectively and fixedly arranged at the central positions of the driving disc and the driven disc in a corresponding axial direction, and the driving disc and the driven disc are parallelly staggered by at least a distance more than a radius and have a working gap between the driving disc and the driven disc; the driving shaft and the driven shaft are arranged on the shell through bearings; magnetorheological fluid is arranged in the shell, magnetic poles capable of moving along the radial direction of the driving disc and the driven disc are arranged on two sides of the staggered and overlapped position of the driving disc and the driven disc, and the magnetic poles are connected with the fixedly arranged magnet exciting coils and are used for forming sliding magnetic fields on the surfaces of the driving disc and the driven disc so as to solidify the magnetorheological fluid at different positions of a working gap and further adjust the transmission ratio of the driving shaft and the driven shaft.
2. The continuous variable transmission of claim 1, wherein the driving discs and the driven discs are arranged on the driving shaft and the driven shaft in at least two groups, and the isolating sleeves are arranged between the adjacent driving discs and the adjacent driven discs.
3. The slip-free continuously variable transmission of claim 2, wherein the driving disk and the driven disk are made of magnetic conductive materials, and the isolation sleeve is made of magnetic isolation materials to ensure that magnetic lines of force vertically pass through the working gap under the condition that the magnetic poles move.
4. The non-slip continuously variable transmission according to claim 3, wherein the driving shaft and the driven shaft are provided with key slots, and the driving disc, the driven disc and the isolation sleeve are arranged on a flat key matched with the key slots and fixedly connected with the driving shaft, the driven shaft and the driven shaft.
5. The continuous variable transmission of claim 1, wherein the field coil is bolted to the housing and electrically connected to a power source for providing a stable and reliable externally applied magnetic field.
6. The continuous variable transmission of claim 1, wherein the magnetic pole connection is provided with a screw-type linear pushing mechanism for driving the magnetic pole to move.
7. The continuous variable transmission of claim 1, wherein the driven and driving discs are trapezoidal in rim cross-section.
CN202210572819.XA 2022-05-25 2022-05-25 Slip-free continuously variable transmission Pending CN114877042A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210572819.XA CN114877042A (en) 2022-05-25 2022-05-25 Slip-free continuously variable transmission

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210572819.XA CN114877042A (en) 2022-05-25 2022-05-25 Slip-free continuously variable transmission

Publications (1)

Publication Number Publication Date
CN114877042A true CN114877042A (en) 2022-08-09

Family

ID=82678005

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210572819.XA Pending CN114877042A (en) 2022-05-25 2022-05-25 Slip-free continuously variable transmission

Country Status (1)

Country Link
CN (1) CN114877042A (en)

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