CN101806343A - Intelligent control method and control device for mechanical continuously-variable transmission - Google Patents
Intelligent control method and control device for mechanical continuously-variable transmission Download PDFInfo
- Publication number
- CN101806343A CN101806343A CN200910046290A CN200910046290A CN101806343A CN 101806343 A CN101806343 A CN 101806343A CN 200910046290 A CN200910046290 A CN 200910046290A CN 200910046290 A CN200910046290 A CN 200910046290A CN 101806343 A CN101806343 A CN 101806343A
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- Prior art keywords
- clockwork spring
- driven
- variable transmission
- adjustable pitch
- clean
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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
- F16H63/00—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
- F16H63/02—Final output mechanisms therefor; Actuating means for the final output mechanisms
- F16H63/04—Final output mechanisms therefor; Actuating means for the final output mechanisms a single final output mechanism being moved by a single final actuating mechanism
- F16H63/06—Final output mechanisms therefor; Actuating means for the final output mechanisms a single final output mechanism being moved by a single final actuating mechanism the final output mechanism having an indefinite number of positions
- F16H63/067—Final output mechanisms therefor; Actuating means for the final output mechanisms a single final output mechanism being moved by a single final actuating mechanism the final output mechanism having an indefinite number of positions mechanical actuating means
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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
- F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
- F16H55/32—Friction members
- F16H55/52—Pulleys or friction discs of adjustable construction
- F16H55/56—Pulleys or friction discs of adjustable construction of which the bearing parts are relatively axially adjustable
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Friction Gearing (AREA)
- Transmissions By Endless Flexible Members (AREA)
- Control Of Transmission Device (AREA)
Abstract
The invention provides an intelligent control method and a control device for a mechanical continuously-variable transmission. By utilizing the elastic memory attribute of the spring, a spiral power spring is used for detecting the magnitude of the required torque; and by utilizing the common movement of the screw rod and the nut, the space between a movable disc and a fixed disc of a driven adjustable cone disc is automatically adjusted according to the detected required torque, thereby automatically searching the most efficient working radius and realizing the optimal transmission ratio. The control device comprises a spiral power spring housing screw-rod assembly 1, a spiral power spring 2, a spiral power spring shell cover 3, a shifting fork nut assembly 4, a spiral power spring dial plate 9 with a shaft sleeve, a driven adjustable cone disc fixed disc 5, a driven adjustable cone disc movable disc 6, a bolt 10, bearings 7 and 7', and housing shells 8 and 8'.
Description
Technical field the present invention relates to a kind of stepless speed variator controlling method and control gear.Especially, the present invention relates to a kind of complete mechanical formula stepless speed variator intelligence control method and control gear that can change best velocity ratio automatically according to required torque.
In the background technique prior art, known is that the stepless speed variator system comprises parts compositions such as driving disc, driven disc, metal tape, oil hydraulic pump and electronic component.Driving disc and driven disc all are made up of movable plate and fixed tray.Movable plate and fixed tray all are cone structures, and their conical surface forms the V-type groove and cooperates with V-type metal driving belt.The power of motor driven shaft output at first is delivered to the driving disc of stepless speed variator, be delivered to driven disc by the V-type driving belt then, the movable plate of controlling driving disc by hydraulic pressure and the common control system of forming of electronic control unit moves axially, change driving disc, the driven disc conical surface and the V-type driving belt and the radius of clean-up, thereby change velocity ratio.The axial internal clearance of movable plate is realized by control system adjusting driven disc, driving disc that oil hydraulic pump oil cylinder working-pressure and electronic control unit are formed jointly as required by the driver.
In the prior art,, cause the speed changer cost higher because the control system of generally using hydraulic system and electronic control unit to form is jointly controlled velocity ratio, complex structure, manufacturing process is loaded down with trivial details, limited and less stable of life-span.
Summary of the invention is in view of above-mentioned actual conditions, the object of the present invention is to provide a kind of complete mechanical formula stepless speed variator intelligence control method and control gear, can detect required torque automatically, and can change best velocity ratio automatically, solve the problems referred to above according to required torque.
To achieve these goals, complete mechanical formula intelligence control method of the present invention is:
Carry out a certain amount of flexibly connecting by clockwork spring between driven shaft and the transmission shaft, under original state, driving disc keeps maximum working radius, and the radius of clean-up of driven disc is in minimum value, to realize minimum velocity ratio, reaches the highest transmission efficiency.The driver can set the Sensitirity va1ue of clockwork spring in advance according to own hobby, make its motor max. output torque 20% to 80% between regulate arbitrarily.When transmission of power is given driven shaft, be no more than at resistance under the situation of setting value, the power that driven shaft obtains can be directly passed to transmission shaft, the radius of clean-up of driven disc still is in minimum value, keeps the highest transmission efficiency; When the value that meets obstructions surpassed setting value, transmission shaft rotated and is obstructed and static or rotating speed reduction, and driven shaft continues rotation under the driving of power, and clockwork spring tightens.Simultaneously, the spacing of driven adjustable pitch cone dish movable plate and driven adjustable pitch cone dish fixed tray is dwindled, thereby the extrusion metal band is to the big direction motion of radius, with the most effective radius of clean-up of automatic searching, overcome suffered resistance, until maximum, thereby intelligence is regulated velocity ratio, makes transmission shaft obtain required torque or Maximum Torque.The elastic memory attribute of root distance spring, clockwork spring can accurately detect the change that makes its deformation force and change amount of deformation, when resistance is reduced to less than setting value, the stored potential energy of clockwork spring obtains discharging, driven adjustable pitch cone dish movable plate and driven adjustable pitch cone dish fixed tray gap increase, the radius of clean-up reduces, thereby searches out the most effective velocity ratio.
To achieve these goals, complete mechanical formula intelligence controlling device of the present invention is:
The mechanical continuously-variable transmission intelligence controlling device comprises clockwork spring shell screw arbor assembly, clockwork spring, clockwork spring cap, shift fork nut assembly, has the clockwork spring dial of axle sleeve, driven adjustable pitch cone dish fixed tray, driven adjustable pitch cone dish movable plate, screw, bearing, case body are formed.A certain amount of flexible link of being undertaken by clockwork spring between driven shaft and the transmission shaft.Install a shift fork and nut additional on driven shaft, with integral piece of the common composition of driven shaft, be called the shift fork nut assembly, regulate the spacing between the adjustable pitch cone dish, thereby adjust the driven disc radius of clean-up, intelligence is regulated best velocity ratio.Install a clockwork spring shell and screw rod additional on transmission shaft, with integral piece of the common composition of transmission shaft, be called clockwork spring screw rod casing assembly, there is clockwork spring clockwork spring screw rod casing assembly inside, can detect required moment of torsion, reaches best velocity ratio.
Under original state, driving disc keeps maximum working radius under the spring pressure effect, and the radius of clean-up of driven disc is in minimum value, to realize minimum velocity ratio, reaches the highest transmission efficiency.The driver can set the Sensitirity va1ue of clockwork spring in advance according to own hobby, make its motor max. output torque 20% to 80% between regulate arbitrarily.When transmission of power is given driven shaft, be no more than at resistance under the situation of setting value, the power that driven shaft obtains can be directly passed to transmission shaft, the radius of clean-up of driven disc still is in minimum value, keeps the highest transmission efficiency; When the value that meets obstructions surpassed setting value, transmission shaft rotated and is obstructed and static or rotating speed reduction, and driven shaft continues rotation under the driving of power, have the clockwork spring dial of axle sleeve, and clockwork spring is tightened.Simultaneously, the shift fork nut assembly moves to the transmission shaft direction, driven adjustable pitch cone dish movable plate is to driven adjustable pitch cone dish fixed tray direction motion, the spacing of driven adjustable pitch cone dish movable plate and driven adjustable pitch cone dish fixed tray is dwindled, thereby the extrusion metal band is to the big direction motion of radius, with the most effective radius of clean-up of automatic searching, overcome suffered resistance, until maximum, thereby intelligence is regulated velocity ratio, makes transmission shaft obtain required torque or Maximum Torque.The elastic memory attribute of root distance spring, clockwork spring can accurately detect the change that makes its deformation force and change amount of deformation, when resistance is reduced to less than setting value, the stored potential energy of clockwork spring obtains discharging, the clockwork spring dial that has axle sleeve rotates under the effect of clockwork spring release elastic force, and the clockwork spring dial that has axle sleeve drives the revolution of shift fork nut assembly.Under the mutual motion of screw rod and nut, the shift fork nut assembly moves to the driven shaft direction.Driven adjustable pitch cone dish movable plate and driven adjustable pitch cone dish fixed tray gap increase, and the radius of clean-up reduces, thereby searches out the most effective velocity ratio.
In this constitutes, preferably, a shift fork and nut are installed in a certain amount of flexible link of being undertaken by clockwork spring between driven shaft and the transmission shaft additional on driven shaft, with common formation shift fork nut assembly on the driven shaft, the shift fork nut assembly is fixedlyed connected with driven adjustable pitch cone dish movable plate.On transmission shaft, install a clockwork spring shell and screw rod additional, form clockwork spring shell screw arbor assembly jointly with transmission shaft.There is clockwork spring clockwork spring screw rod casing assembly inside, and great circle one end of clockwork spring is fixed on the shell of clockwork spring shell screw arbor assembly, and ringlet one end of clockwork spring is fixed on the axle sleeve of the clockwork spring dial that has axle sleeve.
The excellent results that can bring into play according to the present invention is: the stepless speed variator intelligence control method and the device of complete mechanical formula, acting in conjunction by assemblies such as clockwork spring, shift fork nut assembly and clockwork spring shell screw arbor assemblies, speed changer can be according to the size of required torque, the required moment of intelligent recognition, intelligence is regulated velocity ratio, and control is sensitive accurately quick, with low cost, structure and manufacturing process are simple, and the life-span is permanent and stability is stronger.
In conjunction with the accompanying drawings, to detailed introduction of the present invention, can understand above-mentioned and other targets, feature, example and advantage of the present invention more below reading.
Description of drawings
Fig. 1 is the whole sectional drawing of mechanical continuously-variable transmission intelligence controlling device.
Fig. 2 is the clockwork spring schematic representation.
Fig. 3 is a clockwork spring shell screw arbor assembly schematic representation.
Fig. 4 is driven adjustable pitch cone dish fixed tray schematic representation.
Fig. 5 is a shift fork nut assembly schematic representation.
Fig. 6 is the clockwork spring dial schematic representation that has axle sleeve.
Fig. 7 is driven adjustable pitch cone dish movable plate schematic representation.
Label declaration
1 clockwork spring shell screw arbor assembly
2 clockwork springs
3 clockwork spring caps
4 shift fork nut assemblies
5 driven adjustable pitch cone dish fixed trays
6 driven adjustable pitch cone dish movable plates
7 bearings
7 ' bearing
8 case bodies
8 ' case body
9 have the clockwork spring dial of axle sleeve
10 screws
Embodiment is introduced the specific embodiment of the present invention with reference to the accompanying drawings in detail.In this accompanying drawing, same reference number is represented identical or corresponding assembly.
As shown in Figure 1, the mechanical continuously-variable transmission intelligence controlling device comprises clockwork spring shell screw arbor assembly 1, clockwork spring 2, and clockwork spring cap 3, shift fork nut assembly 4, the clockwork spring dial 9 that has axle sleeve, driven adjustable pitch cone dish fixed tray 5, driven adjustable pitch cone dish movable plate 6, screw 10, bearing 7 and 7 ', case body 8 and 8 ' are formed.
As shown in Figure 5, shift fork nut assembly 4 is by shift fork, nut with have the integral piece that the driven shaft of spline is formed.Shift fork nut assembly 4 shift fork ends match with the clockwork spring dial 9 that has axle sleeve, as shown in Figure 6, nut end matches with the screw rod end of clockwork spring shell screw arbor assembly 1, driven axle head matches with the driven adjustable pitch cone dish fixed tray 5 that has spline, fixedlys connected by screw 10 with driven adjustable pitch cone dish movable plate 6.
As Fig. 4 and shown in Figure 7, the spline on the driven adjustable pitch cone dish fixed tray 5 matches with the spline of shift fork nut assembly 4 driven axle heads, shift fork nut assembly 4 driven axle heads is done axially in driven adjustable pitch cone dish fixed tray 5 moved freely.
As shown in Figure 3, the integral piece formed by clockwork spring shell, screw rod and transmission shaft of clockwork spring shell screw arbor assembly 1.Clockwork spring shell screw arbor assembly 1 transmission axle head is connected with retarder (not shown), and the screw rod end matches with the nut end of shift fork nut assembly 4.
As shown in Figure 2, there is clockwork spring 2 clockwork spring shell screw arbor assembly 1 inside, and clockwork spring 2 great circle one ends are fixed on the shell of clockwork spring shell screw arbor assembly 1, and clockwork spring 2 ringlet one ends are fixed on the axle sleeve of the clockwork spring dial 9 that has axle sleeve.Clockwork spring shell screw arbor assembly 1 carries out a certain amount of flexibly connecting with shift fork nut assembly 4 by clockwork spring 2.Clockwork spring cap 3 is fixed in the clockwork spring outer shell end of clockwork spring shell screw arbor assembly 1.
Mechanical continuously-variable transmission intelligence control method mode of execution is:
Clockwork spring shell screw arbor assembly 1 carries out a certain amount of flexibly connecting with shift fork nut assembly 4 by clockwork spring 2.
Under original state, driving disc (not shown) keeps maximum working radius under the spring pressure effect, and this moment driven adjustable pitch cone dish movable plate 6 and the radius of clean-up of driven adjustable pitch cone dish fixed tray 5 be in minimum state, to realize minimum velocity ratio, reach the highest transmission efficiency.
When transmission of power was given shift fork nut assembly 4, because clockwork spring 2 has certain sensitivity, the driver can set the Sensitirity va1ue of clockwork spring 2 in advance according to own hobby, make its motor max. output torque 20% to 80% between regulate arbitrarily.Therefore, be no more than at resistance under the situation of setting value, clockwork spring 2 does not deform, the power that driven shaft obtains can be directly passed to transmission shaft, at this moment, driven shaft and transmission shaft rotate synchronously, and the radius of clean-up of driven adjustable pitch cone dish movable plate 6 and driven adjustable pitch cone dish fixed tray 5 still is in minimum value, keeps the highest transmission efficiency; When the value that meets obstructions surpassed setting value, clockwork spring shell screw arbor assembly 1 rotated and is obstructed and static or rotating speed reduction, and shift fork nut assembly 4 orders about at power and continues rotation down, has the clockwork spring dial 9 of axle sleeve, and clockwork spring 2 is tightened.Simultaneously, under the mutual motion of screw rod and nut, shift fork nut assembly 4 moves to the transmission shaft direction.Because being fixed as one with shift fork nut assembly 4, driven adjustable pitch cone dish movable plate 6 is connected, driven adjustable pitch cone dish movable plate 6 is to driven adjustable pitch cone dish fixed tray 5 directions motion, the driven adjustable pitch cone dish movable plate 6 and the spacing of driven adjustable pitch cone dish fixed tray 5 are dwindled, thereby extrusion metal band (not shown) is to the big direction motion of radius, with the most effective radius of clean-up of automatic searching, overcome suffered resistance, until maximum, thereby intelligence is regulated velocity ratio, makes transmission shaft obtain required torque or Maximum Torque.
The elastic memory attribute of root distance spring, clockwork spring 2 can accurately detect the change that makes its deformation force and change amount of deformation, when resistance is reduced to less than setting value, clockwork spring 2 stored potential energy obtain discharging, the clockwork spring dial 9 that has axle sleeve rotates under the effect of clockwork spring 2 release elastic force, and the clockwork spring dial 9 that has axle sleeve drives 4 revolutions of shift fork nut assemblies.Simultaneously, under the mutual motion of screw rod and nut, shift fork nut assembly 4 increases driven adjustable pitch cone dish movable plate 6 and driven adjustable pitch cone dish fixed tray 5 gaps to the motion of driven shaft direction, the radius of clean-up reduces, thereby searches out the most appropriate velocity ratio according to required torque.
According to the size of resistance, repeat above-mentioned movement process, mechanical type buncher intelligent control system can search out best velocity ratio according to required torque.
Claims (12)
1. a mechanical continuously-variable transmission intelligence control method is characterized in that, utilizes the elastic memory attribute of spring to regulate moment of torsion automatically, seeks best velocity ratio, realizes the highest transmission efficiency.The driver can set the Sensitirity va1ue of clockwork spring in advance according to own hobby, make its motor max. output torque 20% to 80% between regulate arbitrarily.When the value of meeting obstructions during less than setting value, the power that driven shaft obtains can be directly passed to transmission shaft, the radius of clean-up of driven disc is in minimum value, keeps the highest transmission efficiency; When the value of meeting obstructions surpasses setting value, under the transmission shaft drag effect, clockwork spring tightens, nut and screw rod move mutually simultaneously, distance between driven adjustable pitch cone dish movable plate and the fixed tray is dwindled, with the most effective radius of clean-up of automatic searching, thereby realize best velocity ratio, make transmission shaft obtain required torque.
2. mechanical continuously-variable transmission intelligence control method as claimed in claim 1 is characterized in that, utilizes the elastic memory attribute of spring, detects the size of required torque with clockwork spring.
3. mechanical continuously-variable transmission intelligence control method as claimed in claim 1 is characterized in that, the driver can set the Sensitirity va1ue of clockwork spring in advance according to own hobby, make its motor max. output torque 20% to 80% between regulate arbitrarily.
4. mechanical continuously-variable transmission intelligence control method as claimed in claim 1, it is characterized in that, size according to the detected required torque of clockwork spring, interaction by screw rod and nut, regulate the distance between driven adjustable pitch cone dish movable plate and the fixed tray, with the most effective radius of clean-up of automatic searching, realize best velocity ratio.
5. mechanical continuously-variable transmission intelligence control method as claimed in claim 4, it is characterized in that, when resistance during greater than setting value, stir dial by shift fork, clockwork spring is tightened,, regulate the distance between driven adjustable pitch cone dish movable plate and the fixed tray by the mutual motion of screw rod and nut, with the most effective radius of clean-up of automatic searching, realize best velocity ratio.
6. mechanical continuously-variable transmission intelligence control method as claimed in claim 4, it is characterized in that, when resistance is reduced to less than setting value, clockwork spring potential energy obtains discharging, clockwork spring and dial relative movement by the mutual motion of screw rod and nut, are regulated the distance between driven adjustable pitch cone dish movable plate and the fixed tray, with the most effective radius of clean-up of automatic searching, realize best velocity ratio.
7. mechanical continuously-variable transmission intelligence controlling device, comprise clockwork spring shell screw arbor assembly, clockwork spring, clockwork spring cap, shift fork nut assembly, the clockwork spring dial that has axle sleeve, driven adjustable pitch cone dish fixed tray, driven adjustable pitch cone dish movable plate, screw, bearing, case body are formed.The driver can set the Sensitirity va1ue of clockwork spring in advance according to own hobby, make its motor max. output torque 20% to 80% between regulate arbitrarily.When the value of meeting obstructions during less than setting value, the power that driven shaft obtains can be directly passed to transmission shaft, the radius of clean-up of driven disc is in minimum value, keeps the highest transmission efficiency; When the value of meeting obstructions surpasses setting value, under the transmission shaft drag effect, clockwork spring tightens, nut and screw rod move mutually simultaneously, distance between driven adjustable pitch cone dish movable plate and the fixed tray is dwindled, with the most effective radius of clean-up of automatic searching, thereby realize best velocity ratio, make transmission shaft obtain required torque.
8. mechanical continuously-variable transmission intelligence controlling device as claimed in claim 7 is characterized in that, utilizes the elastic memory attribute of spring, detects the size of required torque with clockwork spring.
9. mechanical continuously-variable transmission intelligence controlling device as claimed in claim 7 is characterized in that, the driver can set the Sensitirity va1ue of clockwork spring in advance according to own hobby, make its motor max. output torque 20% to 80% between regulate arbitrarily.
10. mechanical continuously-variable transmission intelligence controlling device as claimed in claim 7, it is characterized in that, size according to the detected required torque of clockwork spring, interaction by screw rod and nut, regulate the distance between driven adjustable pitch cone dish movable plate and the fixed tray, with the most effective radius of clean-up of automatic searching, realize best velocity ratio.
11. mechanical continuously-variable transmission intelligence controlling device as claimed in claim 10, it is characterized in that, when resistance during greater than setting value, stir dial by shift fork, clockwork spring is tightened,, regulate the distance between driven adjustable pitch cone dish movable plate and the fixed tray by the mutual motion of screw rod and nut, with the most effective radius of clean-up of automatic searching, realize best velocity ratio.
12. mechanical continuously-variable transmission intelligence controlling device as claimed in claim 10, it is characterized in that, when resistance is reduced to less than setting value, clockwork spring potential energy obtains discharging, clockwork spring and dial relative movement by the mutual motion of screw rod and nut, are regulated the distance between driven adjustable pitch cone dish movable plate and the fixed tray, with the most effective radius of clean-up of automatic searching, realize best velocity ratio.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910046290A CN101806343A (en) | 2009-02-18 | 2009-02-18 | Intelligent control method and control device for mechanical continuously-variable transmission |
| PCT/CN2009/070823 WO2010094181A1 (en) | 2009-02-18 | 2009-03-17 | A control method and a control device of a continuous variable transmission |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910046290A CN101806343A (en) | 2009-02-18 | 2009-02-18 | Intelligent control method and control device for mechanical continuously-variable transmission |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101806343A true CN101806343A (en) | 2010-08-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910046290A Pending CN101806343A (en) | 2009-02-18 | 2009-02-18 | Intelligent control method and control device for mechanical continuously-variable transmission |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN101806343A (en) |
| WO (1) | WO2010094181A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111658351A (en) * | 2020-05-28 | 2020-09-15 | 杭州电子科技大学 | Manual wheelchair capable of stepless adjusting transmission ratio |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4075902A (en) * | 1976-09-27 | 1978-02-28 | Dana Corporation | Variable speed pulley |
| CN2065263U (en) * | 1989-12-02 | 1990-11-07 | 马新平 | Infinitely-variable gearing adapting to resistance variation of motorcycle |
| FR2658892B1 (en) * | 1990-02-23 | 1995-02-10 | Ibc Europ Sarl | PULLEY DRIVEN BY A VARIABLE SPEED TRANSMISSION. |
| CN2081014U (en) * | 1990-05-22 | 1991-07-17 | 马新平 | Driver adapted to external resistance change of motorcycle |
| IT1256957B (en) * | 1992-10-05 | 1995-12-27 | CONTINUOUS SPEED VARIATOR, IN PARTICULAR FOR A TWO-WHEEL VEHICLE. | |
| CN2585780Y (en) * | 2002-12-11 | 2003-11-12 | 黄兆焕 | Automatic speed variator of motor vehicle |
-
2009
- 2009-02-18 CN CN200910046290A patent/CN101806343A/en active Pending
- 2009-03-17 WO PCT/CN2009/070823 patent/WO2010094181A1/en active Application Filing
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111658351A (en) * | 2020-05-28 | 2020-09-15 | 杭州电子科技大学 | Manual wheelchair capable of stepless adjusting transmission ratio |
| CN111658351B (en) * | 2020-05-28 | 2022-04-15 | 杭州电子科技大学 | Manual wheelchair capable of stepless adjusting transmission ratio |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2010094181A1 (en) | 2010-08-26 |
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Addressee: He Shuai Document name: Notification of Publication of the Application for Invention |
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Application publication date: 20100818 |