CN109611524B

CN109611524B - Continuously variable transmission

Info

Publication number: CN109611524B
Application number: CN201910100542.9A
Authority: CN
Inventors: 曹瑞
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-01-31
Filing date: 2019-01-31
Publication date: 2024-06-14
Anticipated expiration: 2039-01-31
Also published as: CN109611524A

Abstract

The invention discloses a continuously variable transmission. The transmission comprises a transmission body, wherein the transmission body comprises a power input assembly, a power output assembly and a transmission assembly, the power input assembly is connected with the transmission assembly through a first transmission rope, the power output assembly is connected with the transmission assembly through a second transmission rope, the power input assembly comprises an input shaft and an input conical wheel, the power output assembly comprises an output shaft and an output conical wheel, the transmission assembly comprises an intermediate shaft, and the first transmission conical wheel and the second transmission conical wheel which are arranged on the intermediate shaft, and stepless speed change is realized by synchronously adjusting the axial positions of the first transmission rope on the input conical wheel and the second transmission rope on the output conical wheel. The contact line of the driving rope and the corresponding conical working surface is longer, the wrap angle is larger, the pressure of the conical working surface by the driving rope is equal in all directions, and the working shaft of the conical working surface is not stressed radially, so that the driving moment is increased, the driving power is high, and the driving efficiency is high.

Description

Continuously variable transmission

Technical Field

The embodiment of the invention relates to the technical field of vehicle speed change, in particular to a continuously variable transmission.

Background

CVT (Continuously Variable Transmission) technology, i.e. stepless speed change technology, adopts the cooperation of a driving belt and a driving wheel and a driven wheel with variable working diameters to transmit power, and can realize continuous change of the transmission ratio, thereby obtaining the best matching of the driving system and the working condition of an engine. Common continuously variable transmissions include hydromechanical continuously variable transmissions and metal belt type continuously variable transmissions (VDT-CVT), and currently, the number of vehicle types employing CVT in the domestic market is increasing.

Three modes of liquid transmission, electric transmission and mechanical transmission can be adopted. Liquid transmissions fall into two categories: one type is hydraulic, mainly a variable speed transmission device consisting of a pump and a motor or a valve and a pump, and is suitable for medium and small power transmission. The other type is hydraulic type, adopts a hydraulic coupler or a hydraulic torque to carry out variable speed transmission, and is suitable for high power (hundreds to thousands of kilowatts). The main characteristics of the liquid transmission are as follows: the speed regulation range is large, the impact can be absorbed, overload can be prevented, the transmission efficiency is high, the service life is long, and the automation is easy to realize: the manufacturing precision is high, the price is high, the output characteristic is constant torque, the slip rate is high, and oil leakage is easy to occur during operation. Electric drives are largely divided into three categories: the electromagnetic slip clutch is installed in asynchronous motor and is used to regulate speed by changing exciting current. The device has the characteristics of simple structure, low cost and convenient operation and maintenance: the sliding is maximum, the efficiency is low, the heating is serious, and the sliding is not suitable for long-term load operation, so that the sliding is generally only used for low-power transmission. The second type is a direct current motor type, and speed regulation is realized by changing magnetic flux or changing armature voltage. Its advantages are wide speed regulating range, high precision, complex equipment, high cost and difficult maintenance, and it is generally used in medium power range (tens to hundreds kilowatts), and it is gradually replaced by AC motor. Three types are alternating current motor type, and speed regulation is carried out through pole changing, voltage regulation and frequency conversion. The most practical application is frequency conversion speed regulation, namely, an amplitude transformer is adopted to obtain amplitude power supply, and then a motor is driven to change speed. The device is characterized by good speed regulation performance, large range, higher efficiency, automatic control, small volume and wide applicable power range: the mechanical characteristics are constant torque in the speed reduction stage, the low-speed efficiency is low, the operation is not stable enough, the price is high, and the maintenance is required by professionals. In recent years, frequency converters have been rapidly developed as advanced and excellent speed changing devices, and have generated a certain impact on mechanical continuously variable transmissions. The mechanical transmission is mainly characterized in that: the rotating speed is stable, the slip rate is small, the working is reliable, the constant-power mechanical characteristic is realized, the transmission efficiency is higher, the structure is simple, the maintenance is convenient, and the price is relatively low; but the parts have higher requirements for processing and lubrication, lower bearing capacity and poorer overload resistance and impact resistance, so the method is generally suitable for medium and low power transmission.

Continuously variable transmissions are continuous and smooth in power transmission because they are not specifically geared, and are operationally similar to automatic transmissions, but the speed ratio changes are continuous rather than being a jump-out process of an automatic transmission. There are various structures such as V-shaped rubber belt type, metal belt type, multi-disc type, steel ball type, roller turntable type, etc., and most of them use metal belt and rollers with variable radius to transmit power. The change of the gear ratio is achieved through the change of the radius of the driving roller and the radius of the driven roller. In theory, this transmission is very efficient, but must be built up in the case of power which can be transmitted by the load. Because the friction force between the steel belt and the rollers is utilized to transfer power, the working conditions of the steel belt and the rollers are very harsh. In order to effectively transmit power, the steel belt and the rollers are not allowed to slip, and the originally generated heat energy is large, so that internal parts are burnt or severely worn if the steel belt and the rollers slip again. In order to increase the static friction, the most straightforward way is to increase the pressure between the steel strip and the rollers. However, the friction force is increased, the power transmission loss is increased, and the fuel consumption is increased. And the strength of the steel strip is also a major concern. CVT gearboxes have advantages such as comfort, high efficiency, and energy savings. The disadvantage is that the CVT gearboxes in general today cannot withstand large torsion forces. Otherwise, a higher fuel consumption is compensated for.

The continuously variable transmission differs from the stepped type in that its gear ratio is not a point of interruption, but a series of continuous values, which can vary, for example, from 3.455 up to 0.85. The CVT structure is simpler than the traditional transmission, the size is smaller, the CVT structure has no numerous gear pairs of the manual transmission and no complex planetary gear sets of the automatic transmission, and the CVT structure mainly realizes stepless speed ratio change by virtue of a main belt, a driven belt and a metal belt. The principle is that several groups of gears with different sizes are separated and combined under the control of common gear box to form different speed ratios, and the pedals of bicycle are driven by wheel discs and chains to rotate at different speeds. The magnitude of the thrust generated by different forces on each group of gears is different, so that the rotation speed output by the gearbox is also changed, and the gradual rotation without step by step is realized.

Meanwhile, the V-belt type, metal belt type structured continuously variable transmission is small in power transmitted when it becomes the maximum rotation speed and becomes the minimum rotation speed, because the wrap angle is small when the transmission belt contacts with the small radius running wheel, and at this time, it is easy to slip. In addition, the V-belt type, metal belt type structured continuously variable transmission is small in torque transmitted, power transmitted at the time of becoming the maximum rotation speed and becoming the minimum rotation speed becomes small, and slip phenomenon is liable to occur due to a small wrap angle when the transmission belt is in contact with the small radius running wheel.

Disclosure of Invention

Therefore, the embodiment of the invention provides a continuously variable transmission, which solves the problems that the continuously variable transmission is small in transmission power and easy to slip in the prior art.

In order to achieve the above object, the embodiments of the present invention provide the following technical solutions:

the utility model provides a continuously variable transmission, includes the derailleur body, the derailleur body includes power input subassembly, power take off subassembly and drive assembly, power input subassembly and power take off subassembly set up respectively drive assembly's same side, power input subassembly pass through first driving rope with the drive assembly transmission is connected, power take off subassembly pass through the second driving rope with the drive assembly transmission is connected, wherein:

the power input assembly comprises an input shaft and an input cone pulley fixedly arranged on the input shaft, and the first transmission rope is arranged on the input cone pulley;

The power output assembly comprises an output shaft and an output cone pulley fixedly arranged on the output shaft, and the second transmission rope is arranged on the output cone pulley;

The transmission assembly comprises an intermediate shaft, a first transmission conical wheel and a second transmission conical wheel, wherein the first transmission conical wheel and the second transmission conical wheel are fixedly arranged on the intermediate shaft, the first transmission conical wheel is fixedly arranged at one end, close to the input conical wheel, of the intermediate shaft, the first transmission rope is arranged on the first transmission conical wheel, and the input conical wheel drives the first transmission conical wheel to rotate through the first transmission rope so as to drive the second transmission conical wheel to rotate;

The second transmission cone pulley is fixedly arranged at one end of the intermediate shaft, which is close to the output cone pulley, the second transmission rope is arranged on the second transmission cone pulley, the second transmission cone pulley drives the output cone pulley to rotate through the second transmission rope, and stepless speed change is realized by synchronously adjusting the axial positions of the first transmission rope on the input cone pulley and the second transmission rope on the output cone pulley.

The tension device comprises a rope pressing arm, a first rope pressing tension wheel and a second rope pressing tension wheel, wherein the first rope pressing tension wheel and the second rope pressing tension wheel are arranged at two ends of the rope pressing arm, the first rope pressing tension wheel is propped against the first driving rope and is used for tightly matching the first driving rope with the input cone pulley and the first driving cone pulley, and the second rope pressing tension wheel is propped against the second driving rope and is used for tightly matching the second driving rope with the output cone pulley and the second driving cone pulley.

The number of the tensioning devices is 2, one tensioning device is arranged above the position between the input conical wheel and the output conical wheel and the transmission assembly, and the other tensioning device is arranged below the position between the input conical wheel and the output conical wheel and the transmission assembly, so that the first transmission rope and the second transmission rope are in an 8-shaped enclasping state.

The rope pressing arm comprises a rope pressing arm body, a rope pressing arm body and a rope pressing arm, wherein two ends of the rope pressing arm body are respectively provided with a first arm wheel self-adaptive joint and a second arm wheel self-adaptive joint, a first rope pressing tensioning wheel is connected with one end of the rope pressing arm body in a movable mode through the first arm wheel self-adaptive joint, a second rope pressing tensioning wheel is connected with the other end of the rope pressing arm in a movable mode through the second arm wheel self-adaptive joint, and the rope pressing arm comprises the following components:

The first arm wheel self-adaptive joint comprises a first arm wheel joint body, wherein a first main shaft is arranged on one side end surface of the first arm wheel joint body, and a first groove and first fixing holes positioned on two sides of the first groove are arranged on the other side end surface of the first arm wheel joint body;

the second arm wheel self-adaptive joint comprises a second arm wheel joint body, a second main shaft is arranged on one side end face of the second arm wheel joint body, and a second groove and second fixing holes positioned on two sides of the second groove are formed in the other side end face of the second arm wheel joint body.

The first rope pressing tensioning wheel is internally provided with a first through hole, a first rolling bearing is arranged in the first through hole, the first arm wheel self-adaptive joint is matched with the first rolling bearing through the first main shaft to realize rolling connection, one end of the rope pressing arm is fixedly provided with a first connecting shaft, the first connecting shaft is positioned in the first groove, and the end part of the first connecting shaft is movably connected with the first fixing hole; the second rope pressing tensioning wheel is provided with a second through hole, a second rolling bearing is arranged in the second through hole, the second arm wheel self-adaptive joint is matched with the second rolling bearing through the second main shaft to realize rolling connection, the other end of the rope pressing arm is fixedly provided with a second connecting shaft, and the second connecting shaft is positioned in the second groove and the end part of the second connecting shaft is movably connected with the second fixing hole.

The transmission assembly further comprises a connecting portion, the shape of the connecting portion is cylindrical, and the first transmission cone pulley and the second transmission cone pulley are respectively and fixedly arranged at two ends of the connecting portion.

The first transmission cone pulley, the connecting part and the second transmission cone pulley are all coaxially arranged, and two ends of the intermediate shaft respectively penetrate through the first transmission cone pulley and the second transmission cone pulley and extend outwards.

The device comprises a first transmission conical wheel, a second transmission conical wheel, a middle shaft parallel adaptation joint and a middle shaft displacement sliding block, wherein the middle shaft parallel adaptation joint is movably arranged inside the middle shaft displacement sliding block, and the middle shaft is positioned at the end parts outside the first transmission conical wheel and the second transmission conical wheel and is movably connected with the middle shaft parallel adaptation joint respectively, and the middle shaft parallel adaptation joint comprises the following components: the middle shaft displacement sliding block is square in shape and comprises a sliding block body, a C-shaped sliding positioning groove is formed in the sliding block body, and a first positioning hole and a second positioning hole are respectively formed in the side surfaces of the upper end and the lower end of the sliding positioning groove; the intermediate shaft parallel adaptation joint comprises an intermediate shaft joint body, and the intermediate shaft joint body is arranged in the sliding positioning groove; a third through hole is formed in the intermediate shaft joint body, a third rolling bearing is arranged in the third through hole, and two ends of the intermediate shaft are in parallel adaptive joint rolling connection with the intermediate shaft through the third rolling bearing respectively; the upper side and the lower side of jackshaft joint body are provided with first locating shaft and second locating shaft respectively, the jackshaft joint body pass through the cooperation of first locating shaft and first locating hole and the cooperation of second locating shaft and second locating hole with the slider body realizes rotating the connection, just jackshaft parallel adaptation joint passes through first locating shaft and second locating shaft with jackshaft displacement slider free rotation.

The side surface of the intermediate shaft joint body, which is close to the inner side wall of the sliding positioning groove, is a circular arc-shaped surface corresponding to the inner side wall of the sliding positioning groove; the upper end side of the intermediate shaft displacement sliding block is provided with a first sliding groove, the first positioning hole is communicated with the first sliding groove, the lower end side of the intermediate shaft displacement sliding block is provided with a second sliding groove, and the second positioning hole is communicated with the second sliding groove.

The first driving rope and the second driving rope are both composed of annular driving rope bodies, the driving rope bodies are composed of steel wire ropes or fiber ropes, and rubber layers are arranged on the surfaces of the driving rope bodies.

According to an embodiment of the present invention, there is provided a continuously variable transmission having the following advantages: the first rope pressing tensioning wheel between the input conical wheel and the first transmission conical wheel and the second rope pressing tensioning wheel between the output conical wheel and the second transmission conical wheel are respectively applied with elastic external force through the rope pressing arm, so that the two first rope pressing tensioning wheels above and below the input conical wheel and the first transmission conical wheel are gradually close, and the two second rope pressing tensioning wheels above and below the output conical wheel and the second transmission conical wheel are gradually close, so that the rotation power of the input conical wheel is transmitted to the output conical wheel through the first transmission rope, the transmission assembly and the second transmission rope, and the rotation power is transmitted; in addition, through the two tensioning devices, the working shapes of the first driving rope and the second driving rope are in an 8-shaped enclasping state, so that the length of a friction contact line between the first driving rope and the input conical wheel and between the outer surfaces of the first driving conical wheel is increased, the wrap angle of the first driving rope when the first driving rope is tightly matched with the input conical wheel and the first driving conical wheel is increased, and the slipping phenomenon between the first driving rope and the power input conical wheel and between the second driving rope and the output conical wheel and between the second driving rope and the second driving conical wheel is effectively avoided; in addition, the engine drives the input cone pulley to rotate, the first transmission cone pulley and the second transmission cone pulley rotate together under the action of the first transmission rope on the input cone pulley, so that the output cone pulley passively rotates under the action of the second transmission rope on the second transmission cone pulley, and power is output to the vehicle through the output cone pulley. When 2 rope pressing arms are pushed to enable 4 rope pressing tensioning wheels to synchronously move along the directions of an input shaft and an output shaft, the corresponding positions of the driving ropes and the radius of the corresponding working shaft are changed under the constraint of rope grooves of the rope pressing tensioning wheels, and at the moment: when the input shaft is in a small radius and is matched with the first transmission rope to work, the output shaft is necessarily matched with the second transmission rope in a large radius state, the rotating speed of the output shaft is reduced, and the torque is increased; when the input shaft is in large radius and works in cooperation with the first transmission rope, the output shaft is necessarily in small radius state and works in cooperation with the second transmission rope, the rotating speed of the output shaft is increased, and the torque is reduced; when the input shaft is in the middle radius and is matched with the first transmission rope, the output shaft is necessarily matched with the second transmission rope in the middle radius state, the rotating speed of the output shaft is unchanged, and the torque is unchanged. The transmission rope is longer in contact line with the friction surface of the corresponding working shaft under the action of the rope pressing tensioning wheel, the wrap angle is larger, the holding pressure of each working shaft for receiving the transmission rope is equal in all directions, and no radial negative interference stress exists, so that the transmission torque is increased, the transmission power is high, and the transmission efficiency is high.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It will be apparent to those of ordinary skill in the art that the drawings in the following description are exemplary only and that other implementations can be obtained from the extensions of the drawings provided without inventive effort.

The structures, proportions, sizes, etc. shown in the present specification are shown only for the purposes of illustration and description, and are not intended to limit the scope of the invention, which is defined by the claims, so that any structural modifications, changes in proportions, or adjustments of sizes, which do not affect the efficacy or the achievement of the present invention, should fall within the ambit of the technical disclosure.

Fig. 1 is a schematic perspective view of a continuously variable transmission according to an embodiment of the present invention.

Fig. 2 is a schematic structural diagram of two compressing devices in a continuously variable transmission, which are matched with a first driving rope and a second driving rope according to an embodiment of the present invention.

Fig. 3 is an exploded view of a compressing device in a continuously variable transmission according to an embodiment of the present invention.

Fig. 4 is a schematic perspective view of a continuously variable transmission according to an embodiment of the present invention with a rope pressing arm removed.

Fig. 5 is a schematic diagram of a use state of a continuously variable transmission with a maximum output rotation speed according to an embodiment of the present invention.

Fig. 6 is a schematic diagram of a continuously variable transmission according to an embodiment of the present invention in a use state in which the number of rotations output and the number of rotations input are equal.

Fig. 7 is a schematic diagram of a use state of a continuously variable transmission with a minimum number of rotations output by an embodiment of the present invention.

Fig. 8 is an enlarged perspective view of a parallel adaptation joint of an intermediate shaft in a continuously variable transmission according to an embodiment of the present invention.

Fig. 9 is an enlarged perspective view of a countershaft joint body in a continuously variable transmission according to an embodiment of the present invention.

Fig. 10 is an enlarged schematic view of a structure of an intermediate shaft displacement slider in a continuously variable transmission according to an embodiment of the present invention.

In the figure: 100. a power input assembly; 101. an input shaft; 102. an input cone wheel; 200. a power take-off assembly; 201. an output shaft; 202. an output cone wheel; 300. a transmission assembly; 301. an intermediate shaft; 302. a first driven cone pulley; 303. a second driven cone pulley; 304. a connection part; 400. a first driving rope; 500. a second driving rope; 600. a compacting device; 601. rope pressing arms; 602. a first rope pressing tensioning wheel; 603. a second rope pressing tensioning wheel; 604. the first arm wheel is self-adaptive to the joint; 605. the second arm wheel is self-adaptive to the joint; 606. the first arm wheel joint body; 607. a first spindle; 608. a first groove; 609. a first fixing hole; 610. the second arm wheel joint body; 611. a second spindle; 612. a second groove; 613. a second fixing hole; 614. a first through hole; 615. a first connecting shaft; 616. a second through hole; 617. a second connecting shaft; 700. the intermediate shaft displaces the slide blocks, 701 and the slide block body; 702. a slide positioning groove; 703. a first positioning hole; 704. a second positioning hole; 705. a first chute; 706. a second chute; 800. the intermediate shaft is parallel to adapt to the joint; 801. a countershaft joint body; 802. a third through hole; 803. a first positioning shaft; 804. and a second positioning shaft.

Detailed Description

Other advantages and advantages of the present invention will become apparent to those skilled in the art from the following detailed description, which, by way of illustration, is to be read in connection with certain specific embodiments, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

The terms such as "upper", "lower", "left", "right", "middle" and the like are also used in the present specification for convenience of description, but are not intended to limit the scope of the present invention, and the changes or modifications of the relative relationship thereof are considered to be within the scope of the present invention without substantial modification of the technical content.

As shown in fig. 1 to 10, the continuously variable transmission provided in the embodiments of the present invention includes a transmission body, where the transmission body includes a power input assembly 100, a power output assembly 200, and a transmission assembly 300, where the power input assembly 100 and the power output assembly 200 are respectively disposed on the same side of the transmission assembly 300, the power input assembly 100 is in transmission connection with the transmission assembly 300 through a first transmission rope 400, and the power output assembly 200 is in transmission connection with the transmission assembly 300 through a second transmission rope 500, and meanwhile, the power input assembly 100 and the power output assembly 200 are coaxially disposed and respectively disposed parallel to the transmission assembly 300, the power input assembly 100 can be connected with an output shaft of an engine, the power input assembly 100 drives the transmission assembly 300 to rotate through the first transmission rope 400, and the transmission assembly 300 drives the power output assembly 200 to rotate through the second transmission rope 500.

The continuously variable transmission provided by the embodiment of the invention, the power input assembly 100 comprises an input shaft 101 and an input cone pulley 102 fixedly arranged on the input shaft 101, and the first transmission rope 400 is arranged on the input cone pulley 102; the power output assembly 200 includes an output shaft 201 and an output cone 202 fixedly disposed on the output shaft 201, and the second driving rope 500 is disposed on the output cone 202. The input shaft 101 and the output shaft 201 are coaxially arranged.

According to the continuously variable transmission provided by the embodiment of the invention, the transmission assembly 300 comprises an intermediate shaft 301, and a first transmission cone wheel 302 and a second transmission cone wheel 303 which are fixedly arranged on the intermediate shaft 301, wherein the first transmission cone wheel 302 is fixedly arranged at one end, close to the input cone wheel 102, of the intermediate shaft 301, the first transmission rope 400 is arranged on the first transmission cone wheel 302, and the input cone wheel 102 drives the first transmission cone wheel 302 to rotate through the first transmission rope 400, so that the second transmission cone wheel 303 is driven to rotate.

According to the continuously variable transmission provided by the embodiment of the invention, the second transmission cone 303 is fixedly arranged at one end of the intermediate shaft 301 close to the output cone 302, the second transmission rope 500 is arranged on the second transmission cone 303, the second transmission cone 303 drives the output cone 202 to rotate through the second transmission rope 500, and the continuously variable transmission is realized by adjusting the positions of the first transmission rope 400 on the input cone 102 and the second transmission rope 500 on the output cone 202.

The continuously variable transmission provided by the embodiment of the invention further comprises a tensioning device 600, wherein the tensioning device 600 comprises a rope pressing arm 601, and a first rope pressing tensioning wheel 602 and a second rope pressing tensioning wheel 603 which are arranged at two ends of the rope pressing arm 601, the first rope pressing tensioning wheel 602 abuts against the first driving rope 400 and is used for tightly matching the first driving rope 400 with the input conical wheel 102 and the first driving conical wheel 302, and the second rope pressing tensioning wheel 603 abuts against the second driving rope 500 and is used for tightly matching the second driving rope 500 with the output conical wheel 202 and the second driving conical wheel 303.

In the continuously variable transmission provided by the embodiment of the invention, the number of the tensioning devices 600 is 2, one tensioning device is arranged above the space between the input cone pulley 102, the output cone pulley 202 and the transmission assembly 300, and the other tensioning device 600 is arranged below the space between the input cone pulley 102, the output cone pulley 202 and the transmission assembly 300, so that the first transmission rope 400 and the second transmission rope 500 are in an 8-shaped enclasping state. By the above design, the first drive line 400 may be mated with the input cone 102 and the first drive cone 302, and the second drive line 500 may be mated with the output cone 202 and the second drive cone 302.

According to the continuously variable transmission provided by the embodiment of the invention, two ends of a rope pressing arm 601 are respectively provided with a first arm wheel self-adaptive joint 604 and a second arm wheel self-adaptive joint 605, a first rope pressing tensioning wheel 602 is movably connected with one end of the rope pressing arm 601 through the first arm wheel self-adaptive joint 604, and a second rope pressing tensioning wheel 603 is movably connected with the other end of the rope pressing arm 601 through the second arm wheel self-adaptive joint 605, wherein: the first arm wheel adaptive joint 604 includes a first arm wheel joint body 606, a first main shaft 607 is disposed on one side end surface of the first arm wheel joint body 606, and a first groove 608 and a first fixing hole 609 disposed on two sides of the first groove are disposed on the other side end surface of the first arm wheel joint body 606; the second arm wheel adaptive joint 605 includes a second arm wheel joint body 610, one side end surface of the second arm wheel joint body 610 is provided with a second main shaft 611, and the other side end surface of the second arm wheel joint body 610 is provided with a second groove 612 and second fixing holes 613 located at two sides of the second groove 612. Through the above design, namely, the two ends of the rope pressing arm 601 are respectively provided with the first arm wheel self-adaptive joint 604 and the second arm wheel self-adaptive joint 605, when an external force is applied to the rope pressing arm 601, the first rope pressing tensioning wheel 602 and the first transmission rope 400 as well as the second rope pressing tensioning wheel 603 and the second transmission rope 500 can be kept in close fit all the time, and the dislocation of the process during the operation and the speed change of the input cone pulley 102 and the output cone pulley 202 is self-corrected.

According to the continuously variable transmission provided by the embodiment of the invention, a first through hole 614 is formed in the first rope pressing tensioning wheel 602, a first rolling bearing (not shown in the figure) is arranged in the first through hole 614, the first arm wheel self-adaptive joint 604 is matched with the first rolling bearing through the first main shaft 607 to realize rolling connection, a first connecting shaft 615 is fixedly arranged at one end of the rope pressing arm 601, the first connecting shaft 615 is positioned in the first groove 608, and the end part of the first connecting shaft 615 is movably connected with the first fixing hole 609; the second rope pressing tensioning wheel 603 is provided with a second through hole 616, a second rolling bearing (not shown in the figure) is disposed in the second through hole 616, the second arm wheel self-adaptive joint 605 is matched with the second rolling bearing through the second main shaft 611 to realize rolling connection, the other end of the rope pressing arm 601 is fixedly provided with a second connecting shaft 617, the second connecting shaft 617 is disposed in the second groove 612, and the end part of the second connecting shaft is movably connected with the second fixing hole.

According to the continuously variable transmission provided by the embodiment of the invention, the transmission assembly 300 further comprises the connecting part 304, the connecting part 304 is cylindrical, the first transmission cone wheel 302 and the second transmission cone wheel 303 are fixedly arranged at two ends of the connecting part 304 respectively, and the first transmission cone wheel 302, the connecting part 304 and the second transmission cone wheel 303 are integrally formed, so that the processing is convenient.

According to the continuously variable transmission provided by the embodiment of the invention, the first transmission cone wheel 302, the connecting part 304 and the second transmission cone wheel 303 are all coaxially arranged, and two ends of the intermediate shaft 301 respectively penetrate through the first transmission cone wheel 302 and the second transmission cone wheel 303 and extend outwards.

The continuously variable transmission provided by the embodiment of the invention further comprises a middle shaft parallel adaptation joint 800 and a middle shaft displacement sliding block 700, wherein the middle shaft parallel adaptation joint 800 is movably arranged inside the middle shaft displacement sliding block 700, and the middle shaft 301 is respectively and movably connected with the middle shaft parallel adaptation joint 800 at the outer end parts of the first transmission cone wheel 302 and the second transmission cone wheel 303, wherein: the shape of the intermediate shaft displacement sliding block 700 is square, the intermediate shaft displacement sliding block 700 comprises a sliding block body 701, a C-shaped sliding positioning groove 702 is arranged in the sliding block body 701, and a first positioning hole 703 and a second positioning hole 704 are respectively arranged on the side surfaces of the upper end and the lower end of the sliding positioning groove 702; the intermediate shaft parallel adaptation joint 800 comprises an intermediate shaft joint body 801, wherein the intermediate shaft joint body 801 is arranged in the sliding positioning groove 702; a third through hole 802 is provided in the intermediate shaft joint body 801, a third rolling bearing (not shown in the figure) is provided in the third through hole 802, and two ends of the intermediate shaft 301 are in rolling connection with the intermediate shaft parallel adaptation joint 800 through the third rolling bearing respectively; the upper and lower both sides face of jackshaft joint body 801 is provided with first locating shaft 803 and second locating shaft 804 respectively, jackshaft joint body 801 passes through the cooperation of first locating shaft 803 and first locating hole 703 and the cooperation of second locating shaft 804 and second locating hole 704 with slider body 701 realizes rotating the connection, just jackshaft parallel adaptation joint 800 passes through first locating shaft 803 and second locating shaft 804 with jackshaft displacement slider 700 free rotation.

Through the above design, in the process of controlling the speed change, the continuously variable transmission is provided with the intermediate shaft parallel adaptive joints 700 at two ends of the intermediate shaft 301 of the transmission assembly 300, so that the first transmission rope 400 can automatically correct the process dislocation of the input cone pulley 102 in the process of controlling the speed change (the process dislocation in the process of controlling the speed change is allowed), and the second transmission rope 500 automatically corrects the process dislocation of the output cone pulley 202 in the process of controlling the speed change, so that the transmission assembly 300 is always parallel to the input cone pulley 102 and the output cone pulley 202, and the process of controlling the speed change is smoother. In addition, through the intermediate shaft parallel adaptation joint 700, the intermediate shaft can automatically track or compensate the angle deflection when the intermediate shaft is in an unparallel state with the input shaft and the output shaft, thereby achieving the purpose of enabling the intermediate shaft to run more stably.

According to the continuously variable transmission provided by the embodiment of the invention, the side surface of the intermediate shaft displacement sliding block 705, which is close to the inner side wall of the sliding positioning groove 702, and the side surface corresponding to the inner side wall of the sliding positioning groove 702 are arc-shaped surfaces, by the design, the intermediate shaft displacement sliding block 705 can conveniently realize free rotation through the cooperation of the first positioning shaft 707 and the first positioning hole 703 and the cooperation of the second positioning shaft 708 and the second positioning hole 704 and the intermediate shaft parallel adaptation joint 700; the upper end side of the intermediate shaft parallel adaptation joint 700 is provided with a first sliding groove 709, the first positioning hole 703 is communicated with the first sliding groove 709, the lower end side of the intermediate shaft parallel adaptation joint 700 is provided with a second sliding groove 710, and the second positioning hole 704 is communicated with the second sliding groove 710. Through the design, the installation and later maintenance of the intermediate shaft parallel adaptation joint 700 are facilitated.

According to the continuously variable transmission provided by the embodiment of the invention, the first transmission rope 400 and the second transmission rope 500 are respectively formed by annular transmission rope bodies, the transmission rope bodies are formed by steel wire ropes or fiber ropes, and rubber layers are arranged on the surfaces of the transmission rope bodies. Through the design, namely, the rubber layer is arranged on the surface of the driving rope body, the working surfaces of the first driving rope 400 and the second driving rope 500 can have higher friction coefficient, and the purposes of protecting the steel wire ropes or the high-strength fiber ropes inside the first driving rope 400 and the second driving rope 500 and reducing heat generation or having good heat dissipation channels can be achieved. In addition, the first driving rope 400 and the second driving rope 500 are ring-shaped, so that the first driving rope and the second driving rope have strong tensile and compressive properties, the safety and reliability are improved to a certain extent, and the service life of the first driving rope and the second driving rope is prolonged.

According to the continuously variable transmission provided by the embodiment of the invention, the mode of power transmission by matching an existing transmission belt with a main driven wheel is replaced by the aid of the first transmission rope 400, the second transmission rope 500, the input tapered wheel 102, the output tapered wheel 202 and the transmission assembly 300, external force is applied to a first rope pressing tensioning wheel 602 between the input tapered wheel 102 and the first transmission tapered wheel 302 and a second rope pressing tensioning wheel 603 between the output tapered wheel 202 and the second transmission tapered wheel 303 through a rope pressing arm 601 respectively, so that the two first rope pressing tensioning wheels 602 above and below the input tapered wheel 102 and the first transmission tapered wheel 302 are gradually close to each other, and the two second rope pressing wheels 603 above and below the power output tapered wheel 202 and the second transmission tapered wheel 303 are gradually close to each other, so that the first transmission rope 400 is tightly matched with the input tapered wheel 102 and the first transmission tapered wheel 302, and the second transmission tapered wheel 303 are tightly matched with each other, and the power of the input tapered wheel 102 is tightly matched with the second transmission tapered wheel 202 through the first rope pressing wheel 202, and the second rope pressing wheel 202 and the second transmission assembly 300, and the continuously variable transmission is realized; in addition, through the two tensioning devices 600, the first transmission rope 400 and the second transmission rope 500 are in an 8-shaped enclasping state, so that the length of a friction contact line between the first transmission rope 400 and the outer surfaces of the input conical wheel 102 and the first transmission conical wheel 302 is increased, the wrap angle when the first transmission rope 400 is tightly matched with the input conical wheel 102 and the first transmission conical wheel 302 is increased, and the slipping phenomenon between the first transmission rope 400 and the input conical wheel 102 and the first transmission conical wheel 302 and between the second transmission rope 500 and the output conical wheel 202 and the second transmission conical wheel 303 is effectively avoided; in addition, the input cone 102 is driven to rotate by the automobile engine, and the first transmission cone 302 and the second transmission cone 303 are rotated together under the action of the first transmission rope 400 on the input cone 102, so that the output cone is passively rotated under the action of the second transmission rope 500 on the second transmission cone 303.

According to the continuously variable transmission provided by the embodiment of the invention, the intermediate shaft can be far or near to the parallel distance between the input shaft and the output shaft under the action of the intermediate shaft displacement sliding block, and is in a free state within a certain distance in the sliding direction. The first chute and the second chute of the intermediate shaft displacement slide block are connected with a slide rail arranged on the transmission shell in a mounting way (not shown in the figure), and the intermediate shaft displacement slide block is connected with the intermediate shaft through an intermediate shaft parallel adaptive joint. When the maximum or minimum speed is changed, the first rope pressing tensioning wheel and the second rope pressing tensioning wheel are stressed differently, and when the normal abrasion of the first transmission rope and the second transmission rope and the corresponding working piece is inconsistent, the intermediate shaft, the input shaft and the output shaft may generate an unparallel state. The function of the intermediate shaft parallel adaptation joint is to avoid interference in case the intermediate shaft is not parallel to the input shaft and the output shaft.

The continuously variable transmission provided by the embodiment of the invention is characterized in that a first driving rope is arranged on a conical working surface corresponding to an input conical wheel on a first driving conical wheel and an input shaft, and a second driving rope is arranged on a conical working surface corresponding to an output conical wheel on a second driving conical wheel and an output shaft, a first rope pressing tensioning wheel is arranged above and below the first driving rope, a second rope pressing tensioning wheel is arranged above and below the second driving rope, namely, a tensioning wheel is arranged above and below each driving rope, and rope grooves (not shown in the figure) corresponding to the thickness of the driving ropes are formed in the working surfaces of the tensioning wheels and the driving ropes. When the tensioning wheels at the upper part and the lower part are subjected to corresponding elastic pressure, the first transmission rope and the second transmission rope are in an 8-shaped enclasping state to enclasp the input conical wheel and the first intermediate shaft and the second transmission conical wheel and the output conical wheel, and the enclasping degree is related to the pressure applied to the tensioning wheels at the upper part and the lower part. At this time, relative to other belt drives: the contact line of the driving rope and the corresponding conical working surface (such as the conical working surface of the first driving rope, the input conical wheel and the first driving conical wheel) is longer, the wrap angle is larger, the pressure of the conical working surface, which is subjected to the driving rope, is equal in all directions, and the working shaft of the conical working surface is not stressed radially, so that the driving torque is increased, the driving power is high, and the driving efficiency is high.

When the rotational power transmitted by the input shaft works at the small radius of the input cone wheel and the rotational power transmitted by the output shaft works at the large radius of the output cone wheel, the rotational power output by the output shaft has low rotational speed and large torque, as shown in fig. 7. On the contrary, when the rotation power transmitted by the input shaft works on the large radius of the input cone wheel and the rotation power transmitted by the output shaft works on the small radius of the output cone wheel, the rotation speed of the rotation power output by the output shaft is high, the torque is small, and the rotation speed is shown in fig. 5. When the radius of the conical working surfaces of the input conical wheel and the output conical wheel for transmitting the rotary power is different by 1 time, the maximum rotating speed and the minimum rotating speed of the output shaft are different by 16 times, and the torque of the output shaft is also different by 16 times.

In order that the rotational power transmitted at the input shaft operates at a small radius of the input cone and the rotational power transmitted at the output shaft operates at a large radius of the output cone, and the rotational power transmitted at the input shaft operates at a large radius of the input cone and the rotational power transmitted at the output shaft operates at a small radius of the output cone, 2 driving ropes (i.e., first driving ropes and second driving ropes) and 4 rope pressing tension wheels (i.e., 2 first rope pressing tension wheels and 2 second rope pressing tension wheels) are required to be adapted to joint and rope pressing arm synchronous motions through the first arm wheel, the second arm wheel is adapted to joint and rope pressing arm, as shown in fig. 2 and 3. When the input shaft, the output shaft and the intermediate shaft of the transmission rotate, when the force pushes the two rope pressing arms to move towards the direction of the input shaft, the 2 first rope pressing tensioning wheels and the 2 second rope pressing tensioning wheels move along with the force, the rope grooves of the first rope pressing tensioning wheels drive the first driving ropes and the rope grooves of the second rope pressing tensioning wheels drive the second driving ropes to move simultaneously, at the moment, the first driving ropes and the second driving ropes do not move synchronously on the outer circumferences of the corresponding conical working surfaces, the first driving ropes and the second driving ropes cannot grow, but the first rope pressing tensioning wheels and the second rope pressing tensioning wheels can mutually increase the distance under the condition of elastic pressure, the corresponding intermediate shaft can reduce the parallel distance with the input shaft or the output shaft under the action of the intermediate shaft sliding block, the first driving ropes and the second driving ropes always clamp the corresponding conical working surfaces to transmit rotary power, and after the working shafts of the corresponding conical working surfaces rotate for one circle (360 degrees), the driving ropes and the tensioning wheels automatically and normally reset under the action of elastic pressure.

The continuously variable transmission provided by the embodiment of the invention has the advantages that the input shaft, the output shaft and the intermediate shaft can not change speed under the condition of no rotation, for example, in the parking state of an automobile (fault parking), the continuously variable transmission is not in a low-speed high-torque state of the output shaft, and the automobile is difficult to start, which is a shortcoming of the continuously variable transmission, but the reverse gear is arranged between the output shaft and a load, and the continuously variable transmission has the forward gear and neutral gear states, so that the problem is solved.

In the speed change process, because of the structure of each working shaft for transmitting rotary power and space reasons, the motion track of the rope pressing arm is not a straight line parallel to the input and output shafts, the rotating shaft direction and the input and output shaft direction of the tensioning wheel can be kept parallel under the action of the driving rope, the rope groove and the elastic pressure, the position angle between the tensioning wheel and the rope pressing arm can generate deflection change, and the arm wheel adaptation joint connected between the rope pressing arm and the tensioning wheel can avoid interference caused by the deflection change of the position angle between the tensioning wheel and the rope pressing arm.

Through the description of the links in each aspect, the continuously variable transmission provided by the embodiment of the invention is particularly suitable for automobiles and other application occasions. The elastic pressure applied to the rope pressing tensioning wheels (namely the first rope pressing tensioning wheel and the second rope pressing tensioning wheel) and the driving rope can be adjusted according to the torque requirement of the load working condition, so that the service life of a transmission element (particularly the driving rope) is prolonged under the condition that no slip is ensured. Meanwhile, in the process of executing speed change, the optimal configuration of matching the power source and the load can be realized by only pushing the rope pressing arm by force for a corresponding distance in the movement direction, and the speed change and torque change device is particularly suitable for automatic speed change.

While the invention has been described in detail in the foregoing general description and specific examples, it will be apparent to those skilled in the art that modifications and improvements can be made thereto. Accordingly, such modifications or improvements may be made without departing from the spirit of the invention and are intended to be within the scope of the invention as claimed.

Claims

1. The utility model provides a continuously variable transmission, its characterized in that, includes the derailleur body, the derailleur body includes power input subassembly, power take off subassembly and drive assembly, power input subassembly and power take off subassembly set up respectively drive assembly's same side, power input subassembly pass through first driving rope with the drive assembly transmission is connected, power take off subassembly pass through the second driving rope with the drive assembly transmission is connected, wherein:

the second transmission conical wheel is fixedly arranged at one end of the intermediate shaft, which is close to the output conical wheel, the second transmission rope is arranged on the second transmission conical wheel, the second transmission conical wheel drives the output conical wheel to rotate through the second transmission rope, and stepless speed change is realized by synchronously adjusting the axial positions of the first transmission rope on the input conical wheel and the second transmission rope on the output conical wheel;

the tensioning device comprises a rope pressing arm, a first rope pressing tensioning wheel and a second rope pressing tensioning wheel, wherein the first rope pressing tensioning wheel and the second rope pressing tensioning wheel are arranged at two ends of the rope pressing arm, the first rope pressing tensioning wheel is propped against the first driving rope and is used for tightly matching the first driving rope with the input conical wheel and the first driving conical wheel, and the second rope pressing tensioning wheel is propped against the second driving rope and is used for tightly matching the second driving rope with the output conical wheel and the second driving conical wheel;

the second arm wheel self-adaptive joint comprises a second arm wheel joint body, a second main shaft is arranged on one side end surface of the second arm wheel joint body, and a second groove and second fixing holes positioned on two sides of the second groove are arranged on the other side end surface of the second arm wheel joint body;

2. The variable transmission of claim 1, wherein the number of tensioners is 2, one tensioner being disposed above and below the input cone, the output cone and the drive assembly, such that the first and second drive ropes are in a "8" hug condition.

3. The continuously variable transmission according to claim 1, wherein a first through hole is formed in the first rope pressing tensioning wheel, a first rolling bearing is arranged in the first through hole, the first arm wheel self-adaptive joint is matched with the first rolling bearing through the first main shaft to realize rolling connection, a first connecting shaft is fixedly arranged at one end of the rope pressing arm, the first connecting shaft is positioned in the first groove, and the end part of the first connecting shaft is movably connected with the first fixing hole;

The second rope pressing tensioning wheel is provided with a second through hole, a second rolling bearing is arranged in the second through hole, the second arm wheel self-adaptive joint is matched with the second rolling bearing through the second main shaft to realize rolling connection, the other end of the rope pressing arm is fixedly provided with a second connecting shaft, and the second connecting shaft is positioned in the second groove and the end part of the second connecting shaft is movably connected with the second fixing hole.

4. The continuously variable transmission of claim 1, wherein the first driving cone, the connecting portion and the second driving cone are all coaxially arranged, and both ends of the intermediate shaft penetrate through the first driving cone and the second driving cone and extend outwards.

5. The variable transmission of claim 4, further comprising a countershaft parallel adaptation joint and a countershaft displacement slide, the countershaft parallel adaptation joint being movably disposed within the countershaft displacement slide, ends of the countershaft external to the first and second driven cone wheels being respectively movably connected with the countershaft parallel adaptation joint, wherein:

The middle shaft displacement sliding block is square in shape and comprises a sliding block body, a C-shaped sliding positioning groove is formed in the sliding block body, and a first positioning hole and a second positioning hole are respectively formed in the side surfaces of the upper end and the lower end of the sliding positioning groove;

the intermediate shaft parallel adaptation joint comprises an intermediate shaft joint body, and the intermediate shaft joint body is arranged in the sliding positioning groove; a third through hole is formed in the intermediate shaft joint body, a third rolling bearing is arranged in the third through hole, and two ends of the intermediate shaft are in parallel adaptive joint rolling connection with the intermediate shaft through the third rolling bearing respectively;

The upper side and the lower side of jackshaft joint body are provided with first locating shaft and second locating shaft respectively, the jackshaft joint body pass through the cooperation of first locating shaft and first locating hole and the cooperation of second locating shaft and second locating hole with the slider body realizes rotating the connection, just jackshaft parallel adaptation joint passes through first locating shaft and second locating shaft with jackshaft displacement slider free rotation.

6. The continuously variable transmission according to claim 5, wherein a side surface of the intermediate shaft joint body adjacent to an inner side wall of the slide positioning groove and a side surface corresponding to the inner side wall of the slide positioning groove are both arc-shaped surfaces;

The upper end side of the intermediate shaft displacement sliding block is provided with a first sliding groove, the first positioning hole is communicated with the first sliding groove, the lower end side of the intermediate shaft displacement sliding block is provided with a second sliding groove, and the second positioning hole is communicated with the second sliding groove.

7. The continuously variable transmission according to claim 1, wherein the first and second driving ropes are each constituted by an endless driving rope body, and the driving rope body is constituted by a wire rope or a fiber rope, and a rubber layer is provided on a surface of the driving rope body.