CN115285276A - Stepless speed change mechanism - Google Patents
Stepless speed change mechanism Download PDFInfo
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- CN115285276A CN115285276A CN202210955556.0A CN202210955556A CN115285276A CN 115285276 A CN115285276 A CN 115285276A CN 202210955556 A CN202210955556 A CN 202210955556A CN 115285276 A CN115285276 A CN 115285276A
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- gear
- shaft
- rocker
- rocker arm
- connecting rod
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
- B62M11/00—Transmissions characterised by the use of interengaging toothed wheels or frictionally-engaging wheels
- B62M11/04—Transmissions characterised by the use of interengaging toothed wheels or frictionally-engaging wheels of changeable ratio
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
- B62M15/00—Transmissions characterised by use of crank shafts and coupling rods
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
- B62M23/00—Transmissions characterised by use of other elements; Other transmissions
Abstract
The invention discloses a stepless speed change mechanism, which comprises a central shaft, an eccentric wheel, a rocker arm, a rocker shaft, a transmission gear set and a power output mechanism, wherein the central shaft is parallel to the rocker shaft; the rocker arm is vertically and fixedly connected to the end part of the rocker shaft, the transmission gear set is arranged on the rocker shaft, and the transmission gear set is in transmission connection with the power output mechanism; the periphery of the eccentric wheel is connected with a connecting rod through a bearing, the connecting rod is movably connected with a rocker arm, and the length of a connecting point of the connecting rod and the rocker arm from the axle center of a rocker shaft is continuously adjustable; the eccentric wheel drives the connecting rod to swing, the connecting rod drives the rocker arm to rotate, the rocker shaft rotates along with the rocker arm, the force arm of the rocker arm acting on the rocker shaft and the rotating speed of the rocker shaft are continuously adjustable, and the rotating speed transmitted to the power output mechanism by the transmission gear set is also continuously changed; the speed change mechanism can realize stepless speed change of the speed of the bicycle and has the characteristics of simple structure, small size and reliability.
Description
Technical Field
The invention belongs to the field of bicycles, and particularly relates to a stepless speed change mechanism.
Background
At present, bicycle speed changers on the market mainly utilize planetary gear transmission, are only ordinary speed changers with gears and cannot realize speed change of any gear. There is a new kind of neffensive stepless speed changer abroad, the speed between the driving wheel disc and the driven wheel disc is transmitted through a group of small balls, the center of the rack for fixing the group of small balls can move left and right, so that the axes of the balls form an angle, the small balls at the left and right contact points have rotating circumferences with different sizes, the speed ratio is formed due to different lengths of the circumferences of different planes of the balls, and the angle control of the group of small balls is stepless, so that the integral stepless speed change is brought. When the bicycle runs, the input disc obtains power from the pedal, the output disc drives the rear wheel to push the bicycle to move forward, when a low gear is needed when the bicycle runs on an uphill, the driving disc can be rotated to enable the ball bearing to incline towards the input disc, the circumferential diameter of the input disc in contact with the ball bearing is increased, the transmission bicycle is like a transmission bicycle speed changer which is used for shifting a chain onto a larger rear chain wheel, and under the opposite condition, the speed change ratio can be reduced.
In short, the main principle of the continuously variable transmission is that the purpose of continuously variable transmission is achieved by changing the rotating radius of a ball, the structure of the continuously variable transmission is complex and belongs to friction transmission, the principle causes that the continuously variable transmission is low in transmission efficiency, small in speed change range, incapable of bearing large torque and not too long in service life, and the weight of a vehicle body is increased and the use range is narrow due to the fact that a circle of steel balls are added and the weight of the steel balls reaches more than 2.5 kg.
Disclosure of Invention
In view of the above problems and technical needs, the present invention provides a stepless speed change mechanism, which can realize stepless speed change of bicycle speed and has the advantages of simple structure, compactness and reliability.
In order to achieve the purpose, the invention provides the following technical scheme: a stepless speed change mechanism comprises a central shaft, an eccentric wheel, a rocker arm, a rocker shaft, a transmission gear set and a power output mechanism, wherein the central shaft and the rocker shaft are arranged in parallel, the eccentric wheel and the power output mechanism are both arranged on the central shaft, and the eccentric wheel rotates along with the central shaft when the central shaft rotates; the rocker arm is vertically and fixedly connected to the end part of the rocker shaft, the transmission gear set is arranged on the rocker shaft, and the transmission gear set is in transmission connection with the power output mechanism; the periphery of the eccentric wheel is connected with a connecting rod through a bearing, the other end of the connecting rod is movably connected with a rocker arm, and the length of the connecting point of the connecting rod and the rocker arm from the axle center of a rocker shaft is continuously adjustable; the eccentric wheel drives the connecting rod to swing, the connecting rod drives the rocker arm to rotate, the rocker shaft rotates along with the rocker arm, the force arm of the rocker arm acting on the rocker shaft is continuously adjustable, the rotating speed of the rocker shaft is continuously adjustable, and correspondingly, the rotating speed of the power output mechanism transmitted by the transmission gear set on the rocker shaft can also be continuously changed. In the mechanism, a crank is treaded manually to drive a middle shaft to rotate, an eccentric wheel rotates along with the middle shaft, the eccentric distance of the eccentric wheel is fixed, so that the eccentric wheel drives a connecting rod to generate periodic reciprocating swing, the connecting rod drives a rocker arm to do circular motion around a rocker shaft, the force arm of the connecting rod acting on the rocker arm can be continuously adjusted, when the force arm is long, the rotating speed is slow, when the force arm is short, the rotating speed is fast, and the rotating speed of the rocker shaft can be continuously adjusted within a certain range; the rotating speed of the rocker shaft is transmitted to the transmission gear set, and the rotating speed of the transmission gear set is transmitted to the power output mechanism, so that the finally output rotating speed is also continuously adjustable.
In order to ensure the continuous adjustment of the effective force arm of the rocker arm, the further proposal is that an arm length adjusting mechanism is arranged on the rocker arm and comprises a guide rail, a slide block, an adjusting screw rod and a bearing, the rocker arm is hollow, the adjusting screw rod passes through the rocker arm, the adjusting end of the adjusting screw rod extends out from the end part of the rocker arm, and the adjusting screw rod is supported at the core part of the rocker arm through two bearings; the inner wall of the rocker arm is provided with a guide rail, the side wall of the rocker arm is provided with a chute along the length, the inner side of the sliding block is sleeved on the adjusting screw and is in threaded connection with the adjusting screw, the outer side of the sliding block is connected on the guide rail in a sliding manner, a connecting block fixedly arranged on the outer side of the sliding block extends out of the chute, and the end part of the connecting rod is movably connected with the connecting block through a pin shaft. In the above scheme, adjusting screw and slider are equivalent to a set of ball screw pair, and adjusting screw's positive and negative rotation can drive the slider and carry out reciprocal linear motion, and then the effective arm of force of continuous change rocker arm.
In order to improve the connection stability between the connecting rod and the rocker arm, the connecting block is of a U-shaped groove structure, the symmetrical side walls of the U-shaped groove are respectively provided with a mounting hole, the end part of the connecting rod is also provided with a corresponding hole, the connecting rod is inserted into the U-shaped groove, and the pin shaft penetrates through the connecting rod and the mounting hole to hinge the connecting rod and the sliding block together. The connecting rod and the connecting block are connected in a penetrating mode through the pin shaft, the connecting rod is hinged with the sliding block, the U-shaped groove structure can improve the stability of hinging, and the angle does not deviate when the rocker arm rotates periodically.
Furthermore, a gear shifting motor is further arranged on the rocker arm and connected with the adjusting end to drive the adjusting screw to rotate, and the rotating adjusting screw drives the sliding block to do linear motion. Besides the adoption of a gear shifting motor for driving, the rotating speed of the rocker shaft can also be adjusted by manually rotating the adjusting end.
The crank is characterized in that the crank is connected to two ends of a middle shaft, the length from one end of a connecting rod to a pin shaft is L, the radius of an eccentric wheel is R, the eccentric distance is d, and when the two cranks are in a vertical state, the distance from the pin shaft to the rotation center of the eccentric wheel is L + R + d or L + R-d. When the rocker arm is at the extreme position, the distance from the pin shaft to the middle shaft is the longest, so that when the foot is trodden, the bicycle is labor-saving through the up-down position, the riding feeling is good, and the bicycle is easy to ascend. The purpose of setting up like this is in order to improve the effect of riding, lets the position of crank and the position of eccentric wheel have fixed relation, does not set up one-way clutch between axis and the eccentric wheel promptly, lets axis and eccentric wheel fixed connection, but the pedal is stepped on in this moment in reverse, and the bicycle also can go forward. In another scheme, the position relation of the middle shaft and the eccentric wheel is not required to be limited, the middle shaft and the eccentric wheel are connected by adopting a one-way clutch, and the positions of the eccentric wheel and the crank are random. In order to obtain better riding effect, two sets of plane four-bar mechanisms can be adopted, then the output speed is synthesized, a horizontal speed curve can be obtained, and the structure is more complex.
As a preferable scheme, a fourth one-way clutch is arranged between the eccentric wheel and the middle shaft, and the fourth one-way clutch is a ratchet clutch or a one-way needle roller clutch.
Furthermore, the transmission gear set comprises a first gear and a second gear, the first gear is connected to the rocker shaft through a first one-way clutch, the second gear is connected to the rocker shaft through a second one-way clutch, and the arrangement directions of the first one-way clutch and the second one-way clutch are opposite; the power output mechanism is a duplex gear set and comprises a third gear and a fourth gear, the third gear and the fourth gear are integrally or fixedly connected, the first gear is meshed with the third gear, the second gear is meshed with the fourth gear through an idler wheel, and a toothed disc is fixedly sleeved on the outer side of the end part of the duplex gear set.
Furthermore, the dual gear set is an integrally formed piece, the dual gear set is rotatably installed on the middle shaft through a needle bearing, and a third one-way clutch is further arranged between the dual gear set and the middle shaft. If the third one-way clutch is not arranged, the middle shaft and the duplex gear set have no transmission relation, power is transmitted to the chain wheel through the rocker shaft, the transmission gear set and the duplex gear set in sequence, and the eccentric wheel-connecting rod-rocker arm mechanism is a plane four-bar mechanism in principle. This phenomenon is dangerous and seriously affects riding feeling. After the third one-way clutch is arranged, the third one-way clutch can select the output with higher rotating speed in the middle shaft and the duplex gear set, and the third one-way clutch is directly driven by the middle shaft at low rotating speed, so that the wave trough part with lower rotating speed and zero rotating speed is avoided.
In a most preferred embodiment, the transmission gear set comprises a first gear and a second gear, and the first gear and the second gear are respectively connected to the rocker shaft through a flat key; the power output mechanism comprises an output sleeve, a third gear and a fourth gear, the output sleeve is mounted on the middle shaft through a needle bearing, a chain wheel is arranged at the end part of the output sleeve, the third gear and the fourth gear are arranged on the outer side of the output sleeve, a first one-way clutch is arranged between the third gear and the output sleeve, and a second one-way clutch is arranged between the fourth gear and the output sleeve; the first gear is meshed with the third gear, and the second gear is meshed with the fourth gear through an idle gear.
Furthermore, a third one-way clutch is arranged between the output sleeve and the middle shaft.
Compared with the prior art, the invention has the beneficial effects that: the stepless speed change mechanism can accurately and continuously adjust the effective arm length of the rocker arm by arranging the arm length adjusting mechanism on the rocker arm, namely the length of the power arm acting on the rocker arm is continuously adjustable; under the driving of the eccentric wheel, the rotating speed of the rocker shaft can be steplessly changed within a certain range, and the rotating speed of the rocker shaft is finally transmitted to the power output mechanism, so that the output rotating speed can be steplessly adjusted; in addition, through set up third one-way clutch on the axis, can avoid the empty phenomenon of stepping on when riding, improve the security of riding.
Drawings
FIG. 1 is a first schematic view of a continuously variable transmission mechanism according to the present invention;
FIG. 2 is a schematic view of a second embodiment of the continuously variable transmission mechanism of the present invention;
FIG. 3 is a cross-sectional view of a first embodiment of the continuously variable transmission mechanism of the present invention;
FIG. 4 is a partial sectional view of the continuously variable transmission mechanism according to the first embodiment of the present invention;
FIG. 5 is a transmission diagram of the first gear and the third gear in the first embodiment of the continuously variable transmission according to the present invention;
FIG. 6 is a transmission diagram of the second gear and the fourth gear in the first embodiment of the continuously variable transmission according to the present invention;
FIG. 7 is a graph showing the output speed of the continuously variable transmission mechanism of the present invention;
FIG. 8 is a sectional view of a second embodiment of the continuously variable transmission mechanism of the present invention;
FIG. 9 is a transmission diagram of the first gear and the third gear in the second embodiment of the continuously variable transmission mechanism of the present invention;
FIG. 10 is a transmission diagram of the second gear and the fourth gear in the second embodiment of the continuously variable transmission mechanism of the present invention;
labeled in the figure as: the device comprises a middle shaft 1, a crankshaft 11, an eccentric wheel 2, a fourth one-way clutch 21, a bearing 22, a rocker arm 3, a sliding chute 31, an arm length adjusting mechanism 4, a guide rail 41, a sliding block 42, a connecting block 421, an adjusting screw 43, a bearing 44, a rocker shaft 5, a connecting rod 6, a pin shaft 61, a transmission gear set 7, a first gear 71, a first one-way clutch 711, a second gear 72, a second one-way clutch 721, a power output mechanism 8, a double gear set 81, a third gear 811, a fourth gear 812, an output sleeve 82, a third gear 821, a first one-way clutch 8211, a fourth gear 822, a second one-way clutch 8221, an idle wheel 83, a toothed disc 84, a needle bearing 85, a third one-way clutch 86 and a flat key 87.
Detailed Description
The invention is further described below with reference to the figures and examples.
As shown in fig. 1-2, which is a schematic diagram of the principle of the stepless speed change mechanism of the present invention, belonging to a planar four-bar mechanism, under the premise that the eccentricity of the eccentric wheel 2 is not changed, the length of the connecting rod 6 is not changed, and the installation position of the rocker shaft 5 is not changed, the eccentric wheel 2 has a swinging angle θ 1 of the long rocker and a swinging angle θ 2 of the short rocker within a rotation period, as can be seen from the comparison between fig. 1 and 2, θ 1 is less than θ 2, so the average rotation speed of the rocker shaft driven by the long rocker is less than that of the rocker shaft driven by the short rocker. Based on the principle, the swing amplitude of the rocker shaft 5 can be continuously changed by adjusting the effective length of the rocker arm 3, when the rocker arm 3 is increased, the swing amplitude is reduced, and the output rotating speed is reduced; when the rocker arm 3 is shortened, the swing amplitude is increased, and the output rotating speed is increased; the purpose of stepless speed change can be achieved by continuously changing the length of the rocker arm 3.
The first embodiment is as follows:
as shown in fig. 3-6, in a first embodiment of the present invention, a continuously variable transmission mechanism includes a central shaft 1, an eccentric wheel 2, a rocker arm 3, a rocker shaft 5, a transmission gear set 7, and a power output mechanism 8, where the central shaft 1 and the rocker shaft 5 are arranged in parallel, the eccentric wheel 2 and the power output mechanism 8 are both arranged on the central shaft 1, and the eccentric wheel 2 rotates along with the central shaft 1 when the central shaft 1 rotates. Specifically, a fourth one-way clutch 21 is arranged between the eccentric wheel 2 and the middle shaft 1, the fourth one-way clutch 21 is a ratchet clutch or a one-way needle clutch, and the eccentric wheel 2 is driven to rotate through the fourth one-way clutch 21 when the middle shaft 1 rotates.
The rocker arm 3 is vertically and fixedly connected to the end part of the rocker shaft 5, the transmission gear set 7 is arranged on the rocker shaft 5, and the transmission gear set 7 is in transmission connection with the power output mechanism 8; the periphery of the eccentric wheel 2 is connected with a connecting rod 6 through a bearing 22, the other end of the connecting rod 6 is movably connected with the rocker arm 3, and the length of the connecting point of the connecting rod 6 and the rocker arm 3 from the axle center of the rocker shaft 5 is continuously adjustable.
The rocker arm 3 is provided with an arm length adjusting mechanism 4 which comprises a guide rail 41, a sliding block 42, an adjusting screw 43 and a bearing 44, the rocker arm 3 is hollow, the adjusting screw 43 penetrates through the rocker arm 3, the adjusting end of the adjusting screw 43 extends out of the end part of the rocker arm 3, and the adjusting screw 43 is supported at the core part of the rocker arm 3 through the two bearings 44; a guide rail 41 is arranged on the inner wall of the rocker arm 3, a sliding groove 31 is formed in the side wall of the rocker arm 3 along the length, the inner side of the sliding block 42 is sleeved on the adjusting screw 43 and is in threaded connection with the adjusting screw 43, the outer side of the sliding block 42 is connected to the guide rail 41 in a sliding mode, a connecting block 421 fixedly arranged on the outer side of the sliding block 42 extends out of the sliding groove 31, and the end portion of the connecting rod 6 is movably connected with the connecting block 421 through a pin shaft 61; preferably, the connecting block 421 is a U-shaped groove structure, the symmetrical side walls of the U-shaped groove are respectively provided with a mounting hole, the end of the connecting rod 6 is also provided with a corresponding hole, the connecting rod 6 is inserted into the U-shaped groove, and the pin 61 penetrates through the connecting rod 6 and the mounting hole to hinge the connecting rod 6 and the slider 42 together. The rocker arm 3 is further provided with a gear shifting motor (not shown in the figure), the gear shifting motor is connected with the adjusting end and drives the adjusting screw 43 to rotate, the rotating adjusting screw 43 drives the sliding block 42 to do linear motion, and besides the gear shifting motor driving, the rotating speed of the rocker shaft 5 can also be adjusted by manually rotating the adjusting end.
The two ends of the middle shaft 1 are connected with cranks 11, the length from one end of a connecting rod 6 to a pin shaft 61 is L, the radius of the eccentric wheel 2 is R, the eccentricity is d, and when the two cranks 11 are in a vertical state, the distance from the pin shaft 61 to the rotating center of the eccentric wheel 2 is L + R + d or L + R-d. When the rocker arm 3 is at the limit position, the distance between the pin shaft 61 and the middle shaft 1 is the longest, so when feet trample, the labor is saved through the up-down position, the riding feeling is good, the uphill is easier, in order to adjust the better riding effect, the eccentric wheel 2 is fixedly connected with the middle shaft 1, the eccentric wheel 2 and the crank 11 on the middle shaft 1 have a relatively fixed position relation, and the third one-way clutch 86 is cancelled. If the third one-way clutch 86 is employed, the positional relationship is random.
The transmission gear set 7 comprises a first gear 71 and a second gear 72, the first gear 71 is connected to the rocker shaft 5 through a first one-way clutch 711, the second gear 72 is connected to the rocker shaft 5 through a second one-way clutch 721, and the first one-way clutch 711 and the second one-way clutch 721 are arranged in opposite directions; the power output mechanism 8 is a dual gear set 81 and comprises a third gear 811 and a fourth gear 812, the third gear 811 and the fourth gear 812 are integrally arranged or fixedly connected, the first gear 71 is meshed with the third gear 811, the second gear 72 is meshed with the fourth gear 812 through an idle gear 83, and a toothed disc 84 is fixedly sleeved on the outer side of the end part of the dual gear set 81.
The working process of the first embodiment:
the crank 11 at two ends of the middle shaft 1 is manually treaded to drive the middle shaft 1 to rotate, the middle shaft 1 drives the eccentric wheel 2 to rotate, the eccentric wheel 2 drives the connecting rod 6 to swing, the connecting rod 6 drives the rocker arm 3 to rotate, the rocker shaft 5 rotates along with the rocker arm 3, the force arm of the rocker arm 3 acting on the rocker shaft 5 is continuously adjustable, the rotating speed of the rocker shaft 5 is continuously adjustable, and correspondingly, the rotating speed of the power output mechanism 8 transmitted by the transmission gear set 7 on the rocker shaft 5 can also be continuously changed.
When the rocker shaft 5 rotates clockwise, the first one-way clutch 711 drives the first gear 71 to rotate clockwise, and the first gear 71 is meshed with the third gear 811 to drive the dual gear set 81 and the chain wheel 84 to rotate anticlockwise to output power; at the same time, the second one-way clutch 721 on the rocker shaft 5 and the second gear 72 are in an overrunning state, the fourth gear 812 is engaged with the idle gear 83, the idle gear 83 is engaged with the second gear 72, and the fourth gear 812 rotates counterclockwise to drive the second gear 72 to rotate counterclockwise.
When the rocker shaft 5 rotates counterclockwise, the second one-way clutch 721 drives the second gear 72 to rotate counterclockwise, the second gear 72 is meshed with the idle gear 83, and the idle gear 83 is meshed with the fourth gear 812 to drive the dual gear set 81 and the chain wheel 84 to rotate counterclockwise to output power; at the same time, the first one-way clutch 711 on the rocker shaft 5 and the first gear 71 are in an overrunning state, and the third gear 811 in the dual gear set 81 rotates counterclockwise to drive the first gear 71 to idle clockwise.
The dual gear set 81 is an integrally formed part, the dual gear set 81 is rotatably mounted on the middle shaft 1 through a needle bearing 85, and a third one-way clutch 86 is further arranged between the dual gear set 81 and the middle shaft 1.
FIG. 7 is a graph of the output speed of the mechanism (curve a is the speed curve at the highest gear rotation speed, curve b is the speed curve at the middle gear rotation speed, curve c is the speed curve at the lowest gear rotation speed, curve d is the rotation speed directly output by the middle shaft, and is a straight line, and the speed is the same as the rotation speed of the middle shaft); if the third one-way clutch 86 is not arranged, power is not transmitted between the middle shaft 1 and the double gear set 81, the power is transmitted to the chain wheel 84 through the rocker shaft 5, the transmission gear set 7 and the double gear set 81 in sequence, the eccentric wheel 2-connecting rod 6-rocker arm 3 mechanism is a plane four-bar mechanism, however, if the mechanism is only based on the plane four-bar mechanism, the output rotating speed is a sine wave function with the lowest speed being zero, and when a wave trough exists, the rotating speed is zero, namely, the reduction ratio tends to be infinite, so that a person cannot feel force on feet, and the phenomenon of treading empty occurs. This phenomenon is dangerous and seriously affects riding feeling. After the third one-way clutch 86 is arranged, the third one-way clutch 86 can select the output with the higher rotating speed in the middle shaft 1 and the duplex gear set 81, and the lower rotating speed and the zero wave trough part are avoided by directly driving the middle shaft 1 at the low rotating speed.
Example two:
as shown in fig. 8 to 10, in the second embodiment of the continuously variable transmission mechanism of the present invention, the transmission gear set 7 includes a first gear 71 and a second gear 72, and each of the first gear 71 and the second gear 72 is connected to the rocker shaft 5 by a flat key 87; the power output mechanism 8 comprises an output sleeve 82, a third gear 821 and a fourth gear 822, the output sleeve 82 is installed on the middle shaft 1 through a needle bearing 85, a chain wheel 84 is arranged at the end part of the output sleeve 82, the third gear 821 and the fourth gear 822 are arranged on the outer side of the output sleeve 82, a first one-way clutch 8211 is arranged between the third gear 821 and the output sleeve 82, and a second one-way clutch 8221 is arranged between the fourth gear 822 and the output sleeve 82; the first gear 71 is meshed with the third gear 821, and the second gear 72 is meshed with the fourth gear 822 via an idle gear 83. A third one-way clutch 86 is also provided between the output sleeve 82 and the central shaft 1.
Working process of the second embodiment:
when the rocker shaft 5 rotates clockwise, the flat key 87 drives the first gear 71 and the second gear 72 to rotate clockwise, the third gear 821 is meshed with the first gear 71, the third gear 821 rotates counterclockwise, the third gear 821 drives the output sleeve 82 to rotate counterclockwise through the first one-way clutch 8211, and the output sleeve 82 drives the toothed disc 84 to rotate counterclockwise to output power. At this time, the idle gear 83 rotates counterclockwise, the fourth gear 822 rotates clockwise, and the fourth gear 822 and the output sleeve 82 are in an overrunning state.
When the rocker shaft 5 rotates counterclockwise, the flat key 87 drives the first gear 71 and the second gear 72 to rotate counterclockwise at the same time, the second gear 72 is meshed with the idle gear 83, the idle gear 83 rotates clockwise, the fourth gear 822 rotates counterclockwise, and the fourth gear 822 drives the output sleeve 82 to rotate counterclockwise through the second one-way clutch 8221. At this time, the third gear 821 rotates clockwise, and the third gear 821 is in an overrunning state with the output sleeve 82.
In addition, in order to adjust a better riding effect, two sets of plane four-bar mechanisms can be adopted, the synthesized output speed is more straight, but the structure is more complex, and the cost and the volume are increased.
The above description is only for the preferred embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes and substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are also included in the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.
Claims (10)
1. A continuously variable transmission mechanism characterized in that: the eccentric wheel and the power output mechanism are arranged on the middle shaft, and the eccentric wheel rotates along with the middle shaft when the middle shaft rotates; the rocker arm is vertically and fixedly connected to the end part of the rocker shaft, the transmission gear set is arranged on the rocker shaft, and the transmission gear set is in transmission connection with the power output mechanism; the periphery of the eccentric wheel is connected with a connecting rod through a bearing, the other end of the connecting rod is movably connected with a rocker arm, and the length of the connecting point of the connecting rod and the rocker arm from the axle center of a rocker shaft is continuously adjustable; the eccentric wheel drives the connecting rod to swing, the connecting rod drives the rocker arm to rotate, the rocker shaft rotates along with the rocker arm, the force arm of the rocker arm acting on the rocker shaft is continuously adjustable, the rotating speed of the rocker shaft is continuously adjustable, and correspondingly, the rotating speed of the power output mechanism transmitted by the transmission gear set on the rocker shaft can also be continuously changed.
2. A continuously variable transmission mechanism according to claim 1, wherein: the rocker arm is provided with an arm length adjusting mechanism which comprises a guide rail, a sliding block, an adjusting screw rod and bearings, the rocker arm is hollow, the adjusting screw rod penetrates through the rocker arm, an adjusting end of the adjusting screw rod extends out of the end part of the rocker arm, and the adjusting screw rod is supported at the core part of the rocker arm through the two bearings; the inner wall of the rocker arm is provided with a guide rail, the side wall of the rocker arm is provided with a chute along the length, the inner side of the sliding block is sleeved on the adjusting screw and is in threaded connection with the adjusting screw, the outer side of the sliding block is connected on the guide rail in a sliding manner, a connecting block fixedly arranged on the outer side of the sliding block extends out of the chute, and the end part of the connecting rod is movably connected with the connecting block through a pin shaft.
3. A continuously variable transmission mechanism as claimed in claim 2, wherein: the connecting block is of a U-shaped groove structure, the symmetrical side walls of the U-shaped groove are respectively provided with a mounting hole, the end part of the connecting rod is also provided with a corresponding hole, the connecting rod is inserted into the U-shaped groove, and the pin shaft penetrates through the connecting rod and the mounting hole to hinge the connecting rod and the sliding block together.
4. A continuously variable transmission mechanism according to claim 2, wherein: the rocker arm is further provided with a gear shifting motor, the gear shifting motor is connected with the adjusting end and drives the adjusting screw to rotate, and the rotating adjusting screw drives the sliding block to move linearly.
5. A continuously variable transmission mechanism according to claim 2, wherein: the two ends of the middle shaft are connected with cranks, the length from one end of the connecting rod to the pin shaft is L, the radius of the eccentric wheel is R, the eccentricity is d, and when the two cranks are in a vertical state, the distance from the pin shaft to the rotating center of the eccentric wheel is L + R + d or L + R-d.
6. A continuously variable transmission mechanism as claimed in claim 1, wherein: and a fourth one-way clutch is arranged between the eccentric wheel and the middle shaft, and the fourth one-way clutch is a ratchet clutch or a one-way needle roller clutch.
7. A continuously variable transmission mechanism according to claim 1, wherein: the transmission gear set comprises a first gear and a second gear, the first gear is connected to the rocker shaft through a first one-way clutch, the second gear is connected to the rocker shaft through a second one-way clutch, and the arrangement directions of the first one-way clutch and the second one-way clutch are opposite; the power output mechanism is a duplex gear set and comprises a third gear and a fourth gear, the third gear and the fourth gear are integrally or fixedly connected, the first gear is meshed with the third gear, the second gear is meshed with the fourth gear through an idler wheel, and a toothed disc is fixedly sleeved on the outer side of the end part of the duplex gear set.
8. The continuously variable transmission mechanism according to claim 7, wherein: the double gear set is an integrally formed part and is rotatably arranged on the middle shaft through a needle bearing, and a third one-way clutch is further arranged between the double gear set and the middle shaft.
9. A continuously variable transmission mechanism as claimed in claim 1, wherein: the transmission gear set comprises a first gear and a second gear, and the first gear and the second gear are connected to the rocker shaft through a flat key respectively; the power output mechanism comprises an output sleeve, a third gear and a fourth gear, the output sleeve is mounted on the middle shaft through a needle bearing, a chain wheel is arranged at the end part of the output sleeve, the third gear and the fourth gear are arranged on the outer side of the output sleeve, a first one-way clutch is arranged between the third gear and the output sleeve, and a second one-way clutch is arranged between the fourth gear and the output sleeve; the first gear is meshed with the third gear, and the second gear is meshed with the fourth gear through an idle gear.
10. A continuously variable transmission mechanism as claimed in claim 9, wherein: and a third one-way clutch is also arranged between the output sleeve and the middle shaft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210955556.0A CN115285276B (en) | 2022-08-10 | 2022-08-10 | Stepless speed change mechanism |
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| CN115285276B CN115285276B (en) | 2023-06-02 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1388329A (en) * | 2002-04-10 | 2003-01-01 | 北京市机械工业管理局职工大学 | Linkage bar type stepless pulsed speed regulating transmission mechanism |
| CN1693737A (en) * | 2004-05-08 | 2005-11-09 | 王树春 | Mochanical versible speed changer |
| CN201152348Y (en) * | 2008-01-31 | 2008-11-19 | 温志杰 | Eccentric type three-group linked decelerator |
| JP2014035036A (en) * | 2012-08-09 | 2014-02-24 | Honda Motor Co Ltd | Vehicle power transmission device |
| CN104235298A (en) * | 2013-06-12 | 2014-12-24 | 本田技研工业株式会社 | A buncher |
| JP2016044727A (en) * | 2014-08-21 | 2016-04-04 | 本田技研工業株式会社 | Non-stage transmission |
| CN106662240A (en) * | 2014-10-23 | 2017-05-10 | 本田技研工业株式会社 | Transmission |
-
2022
- 2022-08-10 CN CN202210955556.0A patent/CN115285276B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1388329A (en) * | 2002-04-10 | 2003-01-01 | 北京市机械工业管理局职工大学 | Linkage bar type stepless pulsed speed regulating transmission mechanism |
| CN1693737A (en) * | 2004-05-08 | 2005-11-09 | 王树春 | Mochanical versible speed changer |
| CN201152348Y (en) * | 2008-01-31 | 2008-11-19 | 温志杰 | Eccentric type three-group linked decelerator |
| JP2014035036A (en) * | 2012-08-09 | 2014-02-24 | Honda Motor Co Ltd | Vehicle power transmission device |
| CN104235298A (en) * | 2013-06-12 | 2014-12-24 | 本田技研工业株式会社 | A buncher |
| JP2016044727A (en) * | 2014-08-21 | 2016-04-04 | 本田技研工業株式会社 | Non-stage transmission |
| CN106662240A (en) * | 2014-10-23 | 2017-05-10 | 本田技研工业株式会社 | Transmission |
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| CN115285276B (en) | 2023-06-02 |
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