CN115285276B - Stepless speed change mechanism - Google Patents
Stepless speed change mechanism Download PDFInfo
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- CN115285276B CN115285276B CN202210955556.0A CN202210955556A CN115285276B CN 115285276 B CN115285276 B CN 115285276B CN 202210955556 A CN202210955556 A CN 202210955556A CN 115285276 B CN115285276 B CN 115285276B
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- gear
- shaft
- rocker arm
- rocker
- eccentric wheel
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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 eccentric wheel and the power output mechanism are arranged on the central shaft, and the eccentric wheel rotates along with the rotation of the central shaft; the rocker arm is vertically and fixedly connected to the end part of the rocker arm, the transmission gear set is arranged on the rocker arm, 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 the rocker arm, and the length of the connecting point of the connecting rod and the rocker arm from the axis of the 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 arm of force acted on the rocker shaft by the rocker arm 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 continuously changed; the speed change mechanism can realize stepless speed change of the bicycle speed, 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
Currently, the bicycle speed variator on the market mainly utilizes planetary gear transmission, is only a common speed variator with gears, and can not realize any gear speed change. The speed between the driving wheel disc and the driven wheel disc is transmitted through a group of small balls, the center of a rack for fixing the group of small balls can move left and right, thus the axis of the balls forms 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 circumferences of different planes of the balls, and the angle control of the group of small balls is stepless, so the integral stepless speed change is brought. When the bicycle is in use, the input disc obtains power from the pedal, the output disc drives the rear wheel to push the bicycle to advance, when the bicycle runs into an ascending slope and needs to use a low gear, the driving disc can be rotated to enable the balls to incline towards the input disc, the circumference diameter of the input disc, which is in contact with the balls, is enlarged, and the bicycle is just like a transmission bicycle, which drives a chain to a larger rear chain wheel, and in the contrary, 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 through the change of the rotating radius of a ball, the structure is complex, the friction transmission is realized, the transmission efficiency is low, the speed change range is small, large moment cannot be born, the service life is not too long, and the weight of a vehicle body is increased due to the fact that a circle of steel balls is added, the weight of the vehicle body reaches more than 2.5kg, and the using surface is narrow.
Disclosure of Invention
In order to solve the problems and the technical requirements, the invention provides a stepless speed change mechanism which can realize stepless speed change of the speed of a bicycle and has the advantages of simple structure, small size and reliability.
In order to achieve the above object, the present invention provides the following technical solutions: the 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 arranged on the central shaft, and the eccentric wheel rotates along with the central shaft when the central shaft rotates; the rocker arm is vertical 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 the rocker arm, and the length of the connecting point of the connecting rod and the rocker arm from the axis of the 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 arm of force acting on the rocker shaft by the rocker arm 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 trampled by manpower to drive a middle shaft to rotate, an eccentric wheel rotates along with the middle shaft, and the eccentricity of the eccentric wheel is fixed, so that the eccentric wheel drives a connecting rod to generate periodic reciprocating swing, and the connecting rod drives a rocker arm to do circular motion around a rocker shaft; the rotation speed of the rocker shaft is transmitted to the transmission gear set, and the rotation speed of the transmission gear set is transmitted to the power output mechanism, so that the rotation speed of the final output is continuously adjustable.
In order to ensure the continuous adjustability of the effective arm of the rocker arm, the further scheme is that an arm length adjusting mechanism is arranged on the rocker arm and comprises a guide rail, a sliding block, an adjusting screw and a bearing, the rocker arm is hollow, the adjusting screw penetrates through the rocker arm, an adjusting end of the adjusting screw extends out of the end part of the rocker arm, and the adjusting screw is supported on the core part of the rocker arm through two bearings; the inner wall of rocker arm is equipped with the guide rail, and the spout has been seted up along the length to rocker arm lateral wall, the inboard suit of slider is on adjusting screw, with adjusting screw threaded connection, slider outside sliding connection on the guide rail, the connecting block of fixed setting in the slider outside stretches out outside the spout, the tip of connecting rod passes through round pin axle and connecting block swing joint. In the scheme, the adjusting screw and the sliding block are equivalent to a group of ball screw pairs, and the positive and negative rotation of the adjusting screw can drive the sliding block to perform reciprocating linear motion, so that the effective force arm of the rocker arm is continuously changed.
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 parts of the connecting rod are also provided with corresponding holes, the connecting rod is inserted into the U-shaped groove, and the pin shaft penetrates through the connecting rod and the mounting holes to hinge the connecting rod and the sliding block together. The pin shaft is used for penetrating the connecting rod and the connecting block, the connecting rod and the sliding block are hinged together, and the U-shaped groove structure can improve the hinging stability, so that the angle does not deviate when the rocker arm periodically rotates.
Further, a gear motor is further arranged on the rocker arm and connected with the adjusting end, the adjusting screw is driven to rotate, and the rotating adjusting screw drives the sliding block to do linear motion. In addition to using a gear motor drive, the rotation speed of the rocker shaft can also be adjusted by manually rotating the adjustment end.
When the two cranks are in a vertical state, one crank is necessarily rotated to the top end position, then the crank at the top end is stepped on by manpower, the stepping force to be applied is the largest force in one stepping period, and in order to save more labor when stepping at the position, the two ends of the middle shaft are connected with the 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. When the rocker arm is in the limit position, the distance from the pin shaft to the center shaft is longest, so that when a foot steps on the rocker arm, the force is saved through the upper and lower positions, the riding feeling is good, and the climbing is easier. The purpose of setting like this is in order to improve riding effect, lets the position of crank have fixed relation with the position of eccentric wheel, 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 the time of this, and the bicycle also can advance. In another scheme, the position relation between the middle shaft and the eccentric wheel is not limited, and the one-way clutch is used for connecting the middle shaft and the eccentric wheel, so that 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, and then the output speed is synthesized, so that a horizontal speed curve can be obtained, but the structure is 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.
Further, 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 arranged or fixedly connected, the first gear is meshed with the third gear, the second gear is meshed with the fourth gear through an idler gear, and a tooth disc is fixedly sleeved outside the end part of the duplex gear set.
Furthermore, the double gear set is an integrated 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. If the third one-way clutch is not arranged, the middle shaft and the duplex gear set are not in transmission relation, power is transmitted to the toothed disc in sequence through the rocker shaft, the transmission gear set and the duplex gear set, and the eccentric wheel-connecting rod-rocker arm mechanism is based on a plane four-bar mechanism, but if the plane four-bar mechanism is only adopted for transmission, the output rotating speed is a sine wave function with the lowest speed of zero, and when the wave trough is, the rotating speed is zero, namely the reduction ratio tends to be positive to infinity, so that the force cannot be perceived on the feet of people, and the phenomenon of pedal blank occurs. This phenomenon is dangerous and severely affects the riding feel. After the third one-way clutch is arranged, the third one-way clutch can select the output with higher rotation speed between the middle shaft and the duplex gear set, and the middle shaft is directly driven at low rotation speed, so that trough parts with lower rotation speed and zero rotation speed are avoided.
In a most preferred scheme, 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 arranged on a central shaft through a needle bearing, a toothed disc 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 in meshed connection with the third gear, and the second gear is in meshed connection with the fourth gear through an idler gear.
Further, 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 a power arm acting on the rocker arm is continuously adjustable; under the drive of the eccentric wheel, the rotation speed of the rocker shaft can be steplessly changed in a certain range, and the rotation speed of the rocker shaft is finally transmitted to the power output mechanism, so that the output rotation speed can be steplessly adjusted; in addition, through setting up the third one-way clutch in epaxial, can avoid riding the empty phenomenon of stepping on, improve the security of riding.
Drawings
FIG. 1 is a schematic diagram of a continuously variable transmission according to the present invention;
FIG. 2 is a schematic diagram of a continuously variable transmission mechanism according to a second embodiment 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 connection diagram of a first embodiment of the continuously variable transmission mechanism of the present invention;
FIG. 5 is a transmission diagram of a first gear and a third gear in a first embodiment of the continuously variable transmission mechanism of the present invention;
FIG. 6 is a transmission diagram of a second gear and a fourth gear in a first embodiment of the continuously variable transmission mechanism of the present invention;
FIG. 7 is a graph of output speed of the continuously variable transmission of the present invention;
fig. 8 is a cross-sectional view of a second embodiment of the continuously variable transmission mechanism of the present invention;
FIG. 9 is a transmission diagram of a first gear and a third gear in a second embodiment of the continuously variable transmission mechanism of the present invention;
FIG. 10 is a transmission diagram of a second gear and a fourth gear in a second embodiment of the continuously variable transmission mechanism of the present invention;
marked in the figure as: the center shaft 1, the crankshaft 11, the eccentric 2, the fourth one-way clutch 21, the bearing 22, the rocker arm 3, the chute 31, the arm length adjusting mechanism 4, the guide rail 41, the slider 42, the connecting block 421, the adjusting screw 43, the bearing 44, the rocker shaft 5, the connecting rod 6, the pin 61, the drive gear train 7, the first gear 71, the first one-way clutch 711, the second gear 72, the second one-way clutch 721, the power output mechanism 8, the duplex gear train 81, the third gear 811, the fourth gear 812, the output sleeve 82, the third gear 821, the first one-way clutch 8211, the fourth gear 822, the second one-way clutch 8221, the idler 83, the disc 84, the needle bearing 85, the third one-way clutch 86, and the flat key 87.
Detailed Description
The invention is further described below with reference to the drawings and examples.
As shown in fig. 1-2, which is a schematic diagram of the stepless speed change mechanism of the present invention, belongs to a planar four-bar mechanism, on the premise that the eccentricity of the eccentric wheel 2 is unchanged, the length of the connecting rod 6 is unchanged, and the installation position of the rocker shaft 5 is unchanged, the eccentric wheel 2 swings through an angle theta 1 in one rotation period, and swings through an angle theta 2 in a short rocker, as can be seen from comparison of fig. 1 and 2, the theta 1 is smaller than the theta 2, so that the average rotation speed of the rocker shaft driven by the long rocker is smaller than that of the rocker shaft driven by the short rocker. Based on the above principle, the swing amplitude of the rocker shaft 5 can be continuously changed by adjusting the effective length of the rocker arm 3, and when the rocker arm 3 grows, the swing amplitude is reduced, and the output rotation speed is reduced; when the rocker arm 3 is reduced, the swing amplitude is increased, and the output rotating speed is increased; by continuously changing the length of the rocker arm 3, the purpose of stepless speed change can be achieved.
Embodiment one:
referring to fig. 3-6, a stepless speed change mechanism according to a first embodiment of the present invention 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, wherein 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 rotation of the central shaft 1. Specifically, a fourth one-way clutch 21 is arranged between the eccentric wheel 2 and the central shaft 1, the fourth one-way clutch 21 is a ratchet clutch or a one-way needle roller clutch, and the eccentric wheel 2 is driven to rotate by the fourth one-way clutch 21 when the central 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 axis 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 interior of the rocker arm 3 is hollow, the adjusting screw 43 passes through the rocker arm 3, the adjusting end of the adjusting screw 43 extends out from the end part of the rocker arm 3, and the adjusting screw 43 is supported on the core part of the rocker arm 3 through the two bearings 44; the inner wall of the rocker arm 3 is provided with a guide rail 41, the side wall of the rocker arm 3 is provided with a chute 31 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 slidably connected on the guide rail 41, a connecting block 421 fixedly arranged on the outer side of the sliding block 42 extends out of the chute 31, and the end part of the connecting rod 6 is movably connected with the connecting block 421 through a pin shaft 61; preferably, the connecting block 421 has 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, the adjusting screw 43 is driven to rotate, the rotating adjusting screw 43 drives the sliding block 42 to do linear motion, besides being driven by the gear shifting motor, the rotating speed of the rocker shaft 5 can be adjusted by manually rotating the adjusting end.
The two ends of the center 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 rotation center of the eccentric wheel 2 is L+R+d or L+R-d. When the rocker arm 3 is in the limit position, the distance from the pin shaft 61 to the central shaft 1 is the longest, so that when a foot steps on, the upper and lower positions are more labor-saving, riding feel is good, the ascending slope is easier, the eccentric wheel 2 is fixedly connected with the central shaft 1 for adjusting the better riding effect, the eccentric wheel 2 and the crank 11 on the central shaft 1 have a relatively fixed position relationship, 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 arrangement directions of the first one-way clutch 711 and the second one-way clutch 721 are opposite; the power output mechanism 8 is a duplex 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 in meshed connection with the third gear 811, the second gear 72 is in meshed connection with the fourth gear 812 through an idler gear 83, and a toothed disc 84 is fixedly sleeved outside the end part of the duplex gear set 81.
The working procedure of the first embodiment:
the crank 11 at two ends of the middle shaft 1 is stepped by manpower, the middle shaft 1 is driven 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 arm 5 rotates along with the rocker arm 3, the arm of force acting on the rocker arm 5 by the rocker arm 3 is continuously adjustable, the rotating speed of the rocker arm 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 arm 5 can also be continuously changed.
When the rocker shaft 5 rotates clockwise, the first gear 71 is driven to rotate clockwise through the first one-way clutch 711, the first gear 71 is meshed with the third gear 811, and the duplex gear set 81 and the toothed disc 84 are driven to rotate anticlockwise to output power; at the same time, the second one-way clutch 721 on the rocker shaft 5 is in an overrunning state with the second gear 72, the fourth gear 812 is meshed with the idler gear 83, the idler gear 83 is meshed with the second gear 72, and the fourth gear 812 rotates counterclockwise to drive the second gear 72 to idle counterclockwise.
When the rocker shaft 5 rotates anticlockwise, the second gear 72 is driven to rotate anticlockwise through the second one-way clutch 721, the second gear 72 is meshed with the idler gear 83, the idler gear 83 is meshed with the fourth gear 812, and the duplex gear set 81 and the toothed disc 84 are driven to rotate anticlockwise 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 duplex gear set 81 rotates counterclockwise, driving the first gear 71 to idle clockwise.
The double gear set 81 is an integrated part, the double gear set 81 is rotatably arranged on the middle shaft 1 through a needle bearing 85, and a third one-way clutch 86 is arranged between the double gear set 81 and the middle shaft 1.
FIG. 7 is a graph of output speed of the present mechanism (curve a is the speed curve for the highest gear speed, curve b is the speed curve for the middle gear speed, curve c is the speed curve for the lowest gear speed, curve d is the speed directly output by the central axis, and is a straight line, speed is consistent with the central axis speed); if the third one-way clutch 86 is not arranged, the center shaft 1 and the duplex gear set 81 are not in transmission relation, power is transmitted to the toothed disc 84 through the rocker shaft 5, the transmission gear set 7 and the duplex gear set 81 in sequence, and the eccentric wheel 2-connecting rod 6-rocker arm 3 mechanism is based on a plane four-bar mechanism, but if the three-way clutch is only based on the plane four-bar mechanism for transmission, the output rotating speed is a sine wave function with the lowest speed of zero, and when the three-way clutch is in a trough, the rotating speed is zero, namely the reduction ratio tends to be positive infinity, so that people cannot feel force on feet, and the phenomenon of pedal-up occurs. This phenomenon is dangerous and severely affects the riding feel. After the third one-way clutch 86 is provided, the third one-way clutch 86 can select the output with higher rotation speed between the middle shaft 1 and the duplex gear set 81, and the middle shaft 1 is directly driven at low rotation speed, so that trough parts with lower rotation speed and zero rotation speed are avoided.
Embodiment two:
as shown in fig. 8-10, which show a second embodiment of the continuously variable transmission mechanism of the present invention, the driving gear set 7 includes a first gear 71 and a second gear 72, and the first gear 71 and the second gear 72 are connected to the rocker shaft 5 through a flat key 87; the power output mechanism 8 comprises an output sleeve 82, a third gear 821 and a fourth gear 822, wherein the output sleeve 82 is arranged on the middle shaft 1 through a needle bearing 85, a tooth disc 84 is arranged at the end part of the output sleeve 82, a third gear 821 and a 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 in meshed connection with the third gear 821 and the second gear 72 is in meshed connection with the fourth gear 822 by means of an idler gear 83. A third one-way clutch 86 is also provided between the output sleeve 82 and the bottom bracket 1.
Working procedure of example two:
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 anticlockwise, the third gear 821 drives the output sleeve 82 to rotate anticlockwise through the first one-way clutch 8211, and the output sleeve 82 drives the toothed disc 84 to rotate anticlockwise 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 anticlockwise, the first gear 71 and the second gear 72 are simultaneously driven to rotate anticlockwise through the flat key 87, the second gear 72 is meshed with the idle gear 83, the idle gear 83 rotates clockwise, the fourth gear 822 rotates anticlockwise, and the fourth gear 822 drives the output sleeve 82 to rotate anticlockwise through the second one-way clutch 8221. At this time, the third gear 821 rotates clockwise, and the third gear 821 and the output bush 82 are in an overrunning state.
In addition, in order to adjust better riding effect, can adopt two sets of plane four-bar mechanisms, the output speed after the synthesis is more straight, but the structure is comparatively complicated, and cost and volume also can increase.
While the invention has been described with respect to several preferred embodiments, the scope of the invention is not limited thereto, and any changes and substitutions that would be apparent to one skilled in the art within the scope of the invention are intended to be included within the scope of the invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.
Claims (8)
1. A continuously variable transmission mechanism, characterized in that: the device 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 arranged in parallel with the rocker shaft, the eccentric wheel and the power output mechanism are both arranged on the central shaft, and the eccentric wheel rotates along with the rotation of the central shaft; the rocker arm is vertical 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 the rocker arm, and the length of the connecting point of the connecting rod and the rocker arm from the axis of the 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 arm of force acting on the rocker shaft by the rocker arm 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;
the rocker arm is provided with an arm length adjusting mechanism, the rocker arm comprises a guide rail, a sliding block, an adjusting screw and a bearing, the interior of the rocker arm is hollow, the adjusting screw penetrates through the rocker arm, the adjusting end of the adjusting screw extends out of the end part of the rocker arm, and the adjusting screw is supported on 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 sliding groove along the length, the inner side of the sliding block is sleeved on the adjusting screw rod and is in threaded connection with the adjusting screw rod, the outer side of the sliding block is slidably connected to the guide rail, a connecting block fixedly arranged on the outer side of the sliding block extends out of the sliding groove, and the end part of the connecting rod is movably connected with the connecting block through a pin shaft;
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 parts of the connecting rods are also provided with corresponding holes, the connecting rods are inserted into the U-shaped groove, and the pin shafts penetrate through the connecting rods and the mounting holes to hinge the connecting rods and the sliding blocks together.
2. A continuously variable transmission mechanism as claimed in claim 1, wherein: the rocker arm is also provided with a gear motor, the gear motor is connected with the adjusting end and drives the adjusting screw rod to rotate, and the rotating adjusting screw rod drives the sliding block to do linear motion.
3. A continuously variable transmission mechanism as claimed in claim 1, wherein: the two ends of the center 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 rotation center of the eccentric wheel is L+R+d or L+R-d.
4. A continuously variable transmission mechanism as claimed in claim 1, wherein: 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.
5. A continuously variable transmission mechanism as claimed in 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 arranged or fixedly connected, the first gear is meshed with the third gear, the second gear is meshed with the fourth gear through an idler gear, and a tooth disc is fixedly sleeved outside the end part of the duplex gear set.
6. A continuously variable transmission mechanism as claimed in claim 5, wherein: the double gear set is an integrated 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.
7. 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 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 arranged on a central shaft through a needle bearing, a toothed disc 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 in meshed connection with the third gear, and the second gear is in meshed connection with the fourth gear through an idler gear.
8. A continuously variable transmission mechanism as claimed in claim 7, wherein: and a third one-way clutch is arranged between the output sleeve and the middle shaft.
Priority Applications (1)
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| 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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| 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 |
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| CN115285276A (en) | 2022-11-04 |
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