CN202690928U - Magnetorheological fluid continuously variable transmission - Google Patents
Magnetorheological fluid continuously variable transmission Download PDFInfo
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- CN202690928U CN202690928U CN 201220307570 CN201220307570U CN202690928U CN 202690928 U CN202690928 U CN 202690928U CN 201220307570 CN201220307570 CN 201220307570 CN 201220307570 U CN201220307570 U CN 201220307570U CN 202690928 U CN202690928 U CN 202690928U
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- resistance
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- Hydraulic Clutches, Magnetic Clutches, Fluid Clutches, And Fluid Joints (AREA)
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Abstract
The utility model discloses a magnetorheological fluid continuously variable transmission and belongs to the technical field of transmissions. The magnetorheological fluid continuously variable transmission comprises a magnetorheological fluid transmission device and a speed adjusting circuit. The speed adjusting circuit comprises a speed sensor, a magnet exciting coil, a voltage amplifier, a speed adjusting resistor R1, a divider resistor R2, a current limit resistor R3, a resistor R4, a resistor R5, a filter capacitor C1, a negative feedback capacitor C2, a positive feedback capacitor C3, a transistor Q1, a Darlington transistor Q2, a freewheel diode D1, a voltage-regulator diode ZD1, a switch SW and a direct-current power supply BAT. The magnetorheological fluid continuously variable transmission has the advantages of being simple in structure, small in size, high in reliability, strong in stability, good in speed controlling effect and high in precision.
Description
Technical field
The utility model relates to a kind of stepless speed variator, and specifically a kind of magnetic flow liquid stepless speed variator belongs to the speed changer technical field.
Background technique
Magnetic flow liquid is a kind of novel intellectual material, rapid variation will occur in its rheological properties under the effect of externally-applied magnetic field, (Millisecond) viscosity increases at short notice, be transformed into the state of similar solid by the good liquid state of rheological properties, and will be recovered to flowable liquid in case lose externally-applied magnetic field.In recent years, because its superior rheological properties has had certain application at aspects such as soft start, clutch, break, sealing and dampings, also began to develop to some extent in the stepless speed regulation field.US Patent No. 005779013, Torque transfer apparatus using magneto rheological fluids (magnetic flow liquid torquematic transmission), announced a kind of multi-disc type torquematic transmission, utilize the magnetic flow liquid in a plurality of friction disk radial clearances to realize transmission of power as driving medium, can transmit larger torque.Domestic patent CN1523251A discloses a kind of magneto-rheological stepless speed changer of V font rotor structure, adopts two V structures, and is simple in structure, but transmitting torque is little, only applicable industrial small-power occasion.Domestic patent CN101793312A discloses a kind of multi-disc type magneto-rheological stepless speed changer, utilize the magnetic flow liquid in active friction plate and the driven friction disk gap to come transmitting torque, it is rational in infrastructure, transmitted power is large, but can not control the rotating speed of transmission shaft output, have randomness and blindness, can not realize stepless change truly.The patent No. is ZL201120203829.3, name is called a kind of controllable stepless speed change system based on magnetic flow liquid, although it has solved the problems referred to above preferably, but its circuit arranges, and volume is large, cost is high, easy-maintaining not, and its precision has certain narrow limitation, therefore is very restricted in commercial Application.
Summary of the invention
For the problem that above-mentioned prior art exists, the utility model provides a kind of magnetic flow liquid stepless speed variator, its have simple in structure, volume is little, reliability is high, stability is strong, rotating speed is controlled effective and have degree of precision.
To achieve these goals, the technical solution adopted in the utility model is: a kind of magnetic flow liquid stepless speed variator, comprise magnetic flow liquid transmission device and rotational speed regulation circuit, the rotational speed regulation circuit comprises speed probe, field coil, voltage amplifier, speed adjusting resistance R
1, divider resistance R
2, current-limiting resistance R
3, resistance R
4, resistance R
5, filter capacitor C
1, the reverse feedback capacitor C
2, the positive feedback capacitor C
3, transistor Q
1, Darlington transistor Q
2, sustained diode
1, reference diode ZD
1, switch SW and DC electrical source BAT, speed probe and field coil are arranged on the magnetic flow liquid transmission device outside, one end ground connection of speed probe, the other end is connected to the positive signal input part of voltage amplifier, the negative signal input part ground connection of voltage amplifier, the output terminal of voltage amplifier is connected to speed adjusting resistance R
1On, speed adjusting resistance R
1With divider resistance R
2Ground connection after the series connection, divider resistance R
2On be parallel with filter capacitor C
1, reference diode ZD
1With current-limiting resistance R
3Be connected in parallel on filter capacitor C after the series connection
1On, transistor Q
1Emitter be connected in parallel on current-limiting resistance R
3Two ends, transistor Q
1Collector electrode be parallel with the reverse feedback capacitor C
2, Darlington transistor Q
2Base stage and transistor Q
1Collector electrode link to each other Darlington transistor Q
2Grounded-emitter connection, Darlington transistor Q
2Collector electrode and sustained diode
1Positive pole connect sustained diode
1Negative pole be connected to the positive pole of DC electrical source BAT, power cathode ground connection, resistance R through switch SW
4One terminates at transistor Q
1Collector electrode on, the other end is connected on sustained diode
1Negative pole on, sustained diode
1Be parallel with field coil, the positive feedback capacitor C
3With resistance R
5Receive respectively transistor Q after the series connection
1Base stage and Darlington transistor Q
2Collector electrode on.
Further, voltage amplifier comprises earth resistance R
i, feedback resistance R
f, ballast resistor R
pForm ballast resistor R with operational amplifier
pBe connected on the positive signal input part of operational amplifier, earth resistance R
iOne end ground connection, the other end are connected on the negative signal input part of operational amplifier, feedback resistance R
fBe connected between the output terminal and negative signal input part of operational amplifier.
The beneficial effects of the utility model: adopt new-type negative-feedback circuit, improved the stability of output speed, field coil does not need brush equipment, produce without electrical spark, go for electrical spark is had the occasion of insulation request, its have simple in structure, volume is little, reliability is high, stability is strong, rotating speed control is effective, precision is high.
Description of drawings
Fig. 1 is magnetic flow liquid stepless speed variator figure of the present utility model.
Among the figure: 1, magnetic flow liquid transmission device, 2, speed probe, 3, field coil, 4, voltage amplifier.
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing.
As shown in Figure 1, the utility model comprises magnetic flow liquid transmission device 1 and rotational speed regulation circuit, it is characterized in that, described rotational speed regulation circuit comprises speed probe 2, field coil 3, voltage amplifier 4, speed adjusting resistance R
1, divider resistance R
2, current-limiting resistance R
3, resistance R
4, resistance R
5, filter capacitor C
1, the reverse feedback capacitor C
2, the positive feedback capacitor C
3, transistor Q
1, Darlington transistor Q
2, sustained diode
1, reference diode ZD
1, switch SW and DC electrical source BAT, speed probe 2 and field coil 3 are arranged on magnetic flow liquid transmission device 1 outside, one end ground connection of speed probe 2, the other end is connected to the positive signal input part of voltage amplifier 4, the negative signal input part ground connection of voltage amplifier 4, the output terminal of voltage amplifier 4 is connected to speed adjusting resistance R
1On, speed adjusting resistance R
1With divider resistance R
2Ground connection after the series connection, divider resistance R
2On be parallel with filter capacitor C
1, reference diode ZD
1With current-limiting resistance R
3Be connected in parallel on filter capacitor C after the series connection
1On, transistor Q
1Emitter be connected in parallel on current-limiting resistance R
3Two ends, transistor Q
1Collector electrode be parallel with the reverse feedback capacitor C
2, Darlington transistor Q
2Base stage and transistor Q
1Collector electrode link to each other Darlington transistor Q
2Grounded-emitter connection, Darlington transistor Q
2Collector electrode and sustained diode
1Positive pole connect sustained diode
1Negative pole be connected to the positive pole of DC electrical source BAT, power cathode ground connection, resistance R through switch SW
4One terminates at transistor Q
1Collector electrode on, the other end is connected on sustained diode
1Negative pole on, sustained diode
1Be parallel with field coil 3, the positive feedback capacitor C
3With resistance R
5Receive respectively transistor Q after the series connection
1Base stage and Darlington transistor Q
2Collector electrode on.
Voltage amplifier 4 comprises earth resistance R
i, feedback resistance R
f, ballast resistor R
pForm ballast resistor R with operational amplifier
pBe connected on the positive signal input part of operational amplifier, earth resistance R
iOne end ground connection, the other end are connected on the negative signal input part of operational amplifier, feedback resistance R
fBe connected between the output terminal and negative signal input part of operational amplifier.
Filter capacitor C
1, its effect is with reference diode ZD
1The high frequency noise of front keeps off, and only allows needed low-frequency signal pass through, and makes the speed changer running normally and not can be subject to the impact of high frequency noise.
The reverse feedback capacitor C
2, its effect is control Darlington transistor Q
2Switching frequency, make its frequency can be too not high, improve its operating life, suitably select C
2Capacitance size, can make Darlington transistor Q
2Under required frequency, work, and its frequency can not be affected because of the variation of transmission shaft output speed.
The positive feedback capacitor C
3, its objective is and guarantee transistor Q
1Switch motion normal, make its transition become clearer and more definite, can not increase switch cost because transition is indefinite, add in addition positive feedback, the positive feedback capacitor C
3Can be to transistor Q
1Produce a minimum shut-in time, namely for Darlington transistor Q
2With magnetic circuit minimum ON time is arranged.
Sustained diode
1, shield, prevent that the self induction electromotive force that field coil produces from puncturing Darlington transistor Q
2Cause damage, this sustained diode
1At Darlington transistor Q
2During cut-off, a Releasing loop is provided for the electric current in the field coil.
Working procedure: the rotating speed of the transmission shaft of magnetic flow liquid transmission device
nBy speed adjusting resistance R
1Given, this resistance sizes R
1The rotating speed of transmission shaft that obtains with expectation
nDefinite function relation is arranged, namely
R 1 =f (n)=[
A 0 Kn/ (
V ZD1+
V Be)-1]
R 2, wherein,
A 0=1+
R f/
R iBe the magnification factor of voltage amplifier,
K=
u f /
nConversion coefficient for speed probe 2.According to
R 1 =f (n), regulate R
1Resistance size set the output speed of transmission shaft, after speed setting is good, closed electrical source switch SW because transmission shaft does not rotate or rotating speed is lower, so speed probe detects voltage signal rear and that change into its rotating speed
u f Very faint, voltage amplifier is with voltage signal
u f Amplify, through speed adjusting resistance R
1With divider resistance R
2After the series connection dividing potential drop, divider resistance R
2The voltage at two ends is still lower, does not reach reference diode ZD
1Breakdown reverse voltage, therefore transistor Q
1Cut-off, and Darlington transistor Q
2Conducting, field circuit conducting this moment produces magnetic field around the field coil 3, and the magnetic circuit current direction is: power supply BAT positive pole → switch SW → field coil 3 → transistor Q
2Collector electrode → transistor Q
2Emitter → ground connection → power supply BAT negative pole; Under the effect of externally-applied magnetic field, the viscosity of magnetic flow liquid increases rapidly, show the state of similar solid, magnetic flow liquid transmission device 1 utilizes its shearing stress under shear mode to drive transmission shaft and rotates, the output speed of transmission shaft can raise gradually, when its rotating speed surpasses the setting rotating speed, the voltage signal that the speed governing sensor sensing goes out
u f Through voltage amplifier 4 amplifications and by speed adjusting resistance R
1With divider resistance R
2After the series connection dividing potential drop, divider resistance R
2The voltage at two ends reaches reference diode ZD
1Breakdown reverse voltage, this moment transistor Q
1Conducting, and Darlington transistor Q
2Cut-off, this moment, field circuit was cut off, and the magnetic field around the field coil 3 disappears, and the viscosity of magnetic flow liquid reduces rapidly, and the output speed of transmission shaft decreases, when its rotating speed is lower than the setting rotating speed, divider resistance R
2The voltage at two ends can be lower than reference diode ZD again
1Breakdown reverse voltage, thereby transistor Q
1Cut-off, and Darlington transistor Q
2Conducting, field circuit is conducting again, again produces magnetic field around the field coil 3, and the output speed of transmission shaft can raise again again, so repeatedly works, and the output speed of transmission shaft is controlled at sets near the rotating speed.
Claims (2)
1. a magnetic flow liquid stepless speed variator comprises magnetic flow liquid transmission device (1) and rotational speed regulation circuit, it is characterized in that, described rotational speed regulation circuit comprises speed probe (2), field coil (3), voltage amplifier (4), speed adjusting resistance R
1, divider resistance R
2, current-limiting resistance R
3, resistance R
4, resistance R
5, filter capacitor C
1, the reverse feedback capacitor C
2, the positive feedback capacitor C
3, transistor Q
1, Darlington transistor Q
2, sustained diode
1, reference diode ZD
1, switch SW and DC electrical source BAT, speed probe (2) and field coil (3) are arranged on magnetic flow liquid transmission device (1) outside, one end ground connection of speed probe (2), the other end is connected to the positive signal input part of voltage amplifier (4), the negative signal input part ground connection of voltage amplifier (4), the output terminal of voltage amplifier (4) is connected to speed adjusting resistance R
1On, speed adjusting resistance R
1With divider resistance R
2Ground connection after the series connection, divider resistance R
2On be parallel with filter capacitor C
1, reference diode ZD
1With current-limiting resistance R
3Be connected in parallel on filter capacitor C after the series connection
1On, transistor Q
1Emitter be connected in parallel on current-limiting resistance R
3Two ends, transistor Q
1Collector electrode be parallel with the reverse feedback capacitor C
2, Darlington transistor Q
2Base stage and transistor Q
1Collector electrode link to each other Darlington transistor Q
2Grounded-emitter connection, Darlington transistor Q
2Collector electrode and sustained diode
1Positive pole connect sustained diode
1Negative pole be connected to the positive pole of DC electrical source BAT, power cathode ground connection, resistance R through switch SW
4One terminates at transistor Q
1Collector electrode on, the other end is connected on sustained diode
1Negative pole on, sustained diode
1Be parallel with field coil (3), the positive feedback capacitor C
3With resistance R
5Receive respectively transistor Q after the series connection
1Base stage and Darlington transistor Q
2Collector electrode on.
2. magnetic flow liquid stepless speed variator according to claim 1 is characterized in that, described voltage amplifier (4) comprises earth resistance R
i, feedback resistance R
f, ballast resistor R
pForm ballast resistor R with operational amplifier
pBe connected on the positive signal input part of operational amplifier, earth resistance R
iOne end ground connection, the other end are connected on the negative signal input part of operational amplifier, feedback resistance R
fBe connected between the output terminal and negative signal input part of operational amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220307570 CN202690928U (en) | 2012-06-28 | 2012-06-28 | Magnetorheological fluid continuously variable transmission |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220307570 CN202690928U (en) | 2012-06-28 | 2012-06-28 | Magnetorheological fluid continuously variable transmission |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202690928U true CN202690928U (en) | 2013-01-23 |
Family
ID=47546554
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220307570 Withdrawn - After Issue CN202690928U (en) | 2012-06-28 | 2012-06-28 | Magnetorheological fluid continuously variable transmission |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202690928U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102734410A (en) * | 2012-06-28 | 2012-10-17 | 中国矿业大学 | Magnetorheological fluid continuously variable transmission |
-
2012
- 2012-06-28 CN CN 201220307570 patent/CN202690928U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102734410A (en) * | 2012-06-28 | 2012-10-17 | 中国矿业大学 | Magnetorheological fluid continuously variable transmission |
| CN102734410B (en) * | 2012-06-28 | 2014-09-24 | 中国矿业大学 | Magnetorheological fluid continuously variable transmission |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130123 Effective date of abandoning: 20140924 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20130123 Effective date of abandoning: 20140924 |
|
| RGAV | Abandon patent right to avoid regrant |