Continuously variable transmission and bicycle

Abstract

The continuously variable transmission comprises a power transmission device and a variable speed adjusting device, the power transmission device comprises an input wheel, an output wheel, a variable speed adjusting wheel and a plurality of locking pieces, a plurality of containing grooves are formed in the two sides of the variable speed adjusting wheel, the lengths of the containing grooves extend in the radial direction, and the containing grooves are distributed in the circumferential direction of the variable speed adjusting wheel. The plurality of locking pieces are in sliding fit with the plurality of accommodating grooves in a one-to-one correspondence manner; at least one of the locking pieces is locked to the input wheel, and at least one of the locking pieces is locked to the output wheel. The eccentric adjusting device adjusts the positions of the locking pieces locked to the input wheel and the output wheel in the corresponding containing grooves. Compared with the prior art, non-friction continuous stepless speed change can be achieved through the stepless speed changer. When the bicycle is used in the fields of bicycles and power-assisted bicycles, the requirement for personalized adjustment of pedaling force in the riding process of people can be met, and the speed ratio required by people within the speed change range can be easily and rapidly adjusted in the bicycle stopping state, the riding state and the sliding state.

Description

Technical Field

[0001] The utility model belongs to the field of bicycles, and in particular relates to a continuously variable transmission and a bicycle. Background Art

[0002] Existing continuously variable transmissions can be roughly divided into two categories: one is based on friction transmission, such as CVT (belt type, chain belt type), CVP (ball type); the other is pulsation type;

[0003] There are two types of CVTs available now. One type relies on friction transmission, which has the disadvantages of small transmission torque, large transmission efficiency loss, easy wear of transmission parts (belts, chains, steel balls), large size, heavy weight, etc. The other type of pulsating transmission is discontinuous, belongs to intermittent transmission, and has a large speed fluctuation range, large size, heavy weight, and relatively complex adjustment;

[0004] The transmissions currently used on bicycles and power-assisted bicycles are mostly stepped transmissions, which include internal and external transmissions. Both transmissions have limited fixed gears, and it is often the case that the pedaling force is too large to increase a gear and too small to decrease a gear, which cannot meet people's personalized adjustment needs for pedaling force when riding. In addition, the internal transmission is heavy, and the chain is easily dropped when shifting external transmissions. A very small number of transmissions use CVP (round ball) friction transmissions (Newfinch N360 in the United States), which can achieve stepless speed change, but the transmission method uses steel ball friction transmission, which has a great loss of efficiency and is very heavy, so it is rarely used on the market. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a speed-changing regulating device, which is intended to realize stepless speed-changing, is not easy to wear, and has high transmission efficiency.

[0006] In order to solve the above technical problems, the utility model provides a continuously variable transmission, comprising:

[0007] A power transmission device comprises an input wheel, an output wheel, a speed adjustment wheel and a plurality of locking members, wherein the input wheel and the output wheel are coaxially arranged and mounted on both sides of the speed adjustment wheel, and the two sides of the speed adjustment wheel are provided with a plurality of receiving grooves extending in a radial direction and arranged along the circumference of the speed adjustment wheel, and the plurality of locking members are divided into two groups, the two groups of locking members are arranged to form two concentric circles, and the two groups of locking members are respectively located between the input wheel and the speed adjustment wheel, and between the speed adjustment wheel and the output wheel; and the plurality of locking members are slidably matched with the plurality of receiving grooves in a one-to-one correspondence;

[0008] The speed adjustment wheel is in any position, at least one locking member in one group is locked to the input wheel, the input wheel is used to input power to drive the speed adjustment wheel to rotate, and at least one locking member in the other group is locked to the output wheel to drive the output wheel to rotate;

[0009] A locking member locked to the input wheel and a locking member locked to the output wheel, and a line connecting the two and the center of the speed adjustment wheel form an angle;

[0010] The eccentric adjustment device is transmission-connected to the speed adjustment wheel, and is used to drive the speed adjustment wheel to move along the diameter direction of the input wheel to adjust the position of the locking member finally locked to the input wheel and finally locked to the output wheel in the corresponding receiving groove.

[0011] In one embodiment, the continuously variable transmission further comprises a mounting shaft, and the input wheel, the speed adjustment wheel and the output wheel are all rotatably engaged with the mounting shaft;

[0012] The eccentric adjustment device comprises an eccentric wheel, an eccentric member and a first gear. The eccentric wheel is provided with a clearance groove extending in a direction perpendicular to the axis of the installation shaft. The eccentric wheel is sleeved on the installation shaft through the clearance groove. The eccentric wheel is concentrically arranged and rotationally connected with the speed adjustment wheel.

[0013] The eccentric piece is fixedly connected to the eccentric wheel, the first gear is fixedly connected to the mounting shaft and meshes with the eccentric piece, and the mounting shaft is configured to rotate by external force to drive the first gear to rotate around its own axis to drive the eccentric piece to move along the length direction of the clearance groove.

[0014] In one of the embodiments, a clamping groove is provided on a side surface of the eccentric wheel, and the eccentric piece is at least partially located in the clamping groove and clamped with the eccentric wheel.

[0015] In one of the embodiments, a magnetic device is provided at the groove edge of the receiving groove, and the magnetic device is used to drive the locking member to be close to the groove edge.

[0016] In one embodiment, the power transmission device further comprises a fixing mechanism, the fixing mechanism is relatively stationary relative to the axis of the input wheel, the fixing mechanism is provided with a clamping portion, the clamping portion is arranged along the rotation path of the locking member, and the length of the clamping portion is greater than the maximum length between two adjacent locking members;

[0017] The locking member includes a limiting portion, a base, and a movable assembly, wherein the limiting portion is connected to the base and is located on a side of the base facing the speed adjustment wheel, the limiting portion is slidably connected to the receiving groove, and the movable assembly is located in the base;

[0018] When the locking member rotates to the pressing portion, the pressing portion pushes the movable assembly out of the base and abuts against the output wheel or the output wheel to complete the locking.

[0019] In one embodiment, the fixing mechanism includes a first fixing member and a second fixing member, which are distributed on both sides of the speed adjustment wheel and are both provided with a clamping portion, and the two clamping portions are symmetrically arranged along the axis center.

[0020] In one embodiment, the movable assembly includes a pushing portion, a moving portion, a resisting portion, a first spring, and a second spring;

[0021] The base is provided with a receiving cavity and the opening faces the input wheel or the output wheel, the bottom surface of the receiving cavity is provided with a first inclined surface and is from low to high from the first spring to the moving part, and the first inclined surface is used to support the abutting part;

[0022] The first spring, the abutting portion and the moving portion are located in the accommodating cavity and are arranged in sequence. One end of the first spring away from the abutting portion is fixedly connected to the first side wall of the accommodating cavity. The pressing portion is used to push the pushing portion along a first direction. The pushing portion and the moving portion are slidably connected along a second direction. The first direction is the axial direction of the input wheel, and the second direction is perpendicular to the first direction.

[0023] A second inclined surface is provided on a second side wall of the accommodating cavity corresponding to the first side wall, and the moving part can move in the first direction and the second direction simultaneously along the second inclined surface, so that the first spring pushes the abutting part to move from the lower part of the first inclined surface to the higher part, until the abutting part extends out of the accommodating cavity from the opening and abuts against the inner wall of the input wheel or the output wheel;

[0024] The elastic force of the second spring is greater than the elastic force of the first spring. One end of the second spring is fixedly connected to the inner wall of the accommodating cavity, and the other end is fixedly connected to the pushing part. The second spring deforms along the second direction. The second spring is used to push the supporting part back into the accommodating cavity after the clamping part is disengaged from the pushing part.

[0025] In one embodiment, both the input wheel and the output wheel have an annular groove for accommodating the base, the openings of the annular grooves are both facing the speed adjustment wheel, the locking member is limited in the annular groove for rotational movement, and the opening of the accommodating cavity is facing the groove wall on one side of the annular groove away from the center of the circle.

[0026] The present application also provides a bicycle, comprising the continuously variable transmission mentioned in any one of the above embodiments, wherein the input wheel is connected to the pedal power, and the output wheel is connected to the rear wheel power.

[0027] In one embodiment, the continuously variable transmission is mounted on a mounting shaft at the center of the rear wheel, and the continuously variable transmission also includes a second gear, which is coaxially fixedly connected to the input wheel, the second gear is connected to the pedal transmission through a chain, and the output wheel is fixedly connected to the mounting shaft.

[0028] Compared with the prior art, the continuously variable transmission in the utility model can realize non-friction continuous stepless speed change, can change speed in static state and rotating state, is convenient for speed regulation, light weight and small size. It can be used in the field of bicycles and power-assisted bicycles to meet people's personalized adjustment needs for pedaling force when riding, and can easily and quickly adjust to the speed ratio people want within the speed range when the bicycle is stopped, riding or gliding. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1It is a schematic diagram of the overall structure of a continuously variable transmission in an embodiment of the utility model;

[0030] Figure 2 It is the assembly relationship diagram of the continuously variable transmission;

[0031] Figure 3a It is an assembly relationship diagram of the speed adjustment wheel, the locking member, the input wheel and the output wheel;

[0032] Figure 3b This is the speed change principle diagram after the speed change adjustment wheel is eccentric;

[0033] Figure 4a The assembly diagram of the locking parts is shown;

[0034] Figure 4b A bottom-up view of the locking member is shown;

[0035] Figure 4c A top view of the locking member is shown;

[0036] Figure 4d A cross-sectional shape diagram of the accommodation cavity is shown;

[0037] Figure 5 A schematic structural diagram of a first fixing member is shown;

[0038] Figure 6 The assembly diagram of the eccentric adjustment device is shown.

[0039] In the accompanying drawings, the various reference numerals represent: input wheel 100; output wheel 200; speed adjustment wheel 300; accommodating groove 310; eccentric wheel 320; give way groove 321; snap-on groove 322; eccentric piece 330; first gear 340; magnetic device 350; locking piece 400; limiting portion 410; base 420; accommodating cavity 421; first inclined surface 422; second inclined surface 423; pushing portion 431; moving portion 432; supporting portion 433; first spring 434; second spring 435; mounting shaft 500; first fixing member 610; second fixing member 620; pressing portion 630; open groove 640; second gear 700. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0041] The present application provides a continuously variable transmission and a bicycle using the continuously variable transmission. The continuously variable transmission includes two major devices, the first being a power transmission device and the second being an eccentric adjustment device. In order to make it easier for readers to understand the present solution, the present application will start with the bicycle and explain the structure of the continuously variable transmission from large to small.

[0042] Speed ​​bikes are divided into stepped and continuously variable. The difference between the two is that the gear ratio of stepped bikes is intermittent, for example, it can only change from 2:1 to 1.9:1, and you cannot choose a number between 2 and 1.9. Continuously variable bikes can achieve continuous speed changes, that is, users can choose any number between 2 and 1.9. Continuously variable bikes can better meet users' riding needs than stepped bikes.

[0043] The bicycle provided in this application is equipped with a continuously variable transmission, see Figure 1 , Figure 1 The appearance structure diagram of the continuously variable transmission is shown. The continuously variable transmission can be installed at the rear wheel or the footrest of the bicycle. Generally, in order to simplify the structure of the footrest, the continuously variable transmission will be installed at the rear wheel. However, when other structures need to be installed at the footrest, such as a child's safety seat, the continuously variable transmission can be installed at the footrest for space utilization, thereby simplifying the structure at the rear wheel.

[0044] from Figure 1 It can be seen that there is a large gear outside the continuously variable transmission, which is named the second gear 700 in this application. When the continuously variable transmission is installed at the rear wheel, the second gear 700 and the gear at the pedal realize power transmission through a chain, and the continuously variable transmission is provided with an input wheel 100, and the second gear 700 and the input wheel 100 are coaxially fixedly connected, so that the power provided by the user is transmitted to the input wheel 100 intact. The continuously variable transmission also includes an output wheel 200, and the input wheel 100 and the output wheel 200 rotate coaxially, and the input wheel 100 is a power input part, and the output wheel 200 is a power receiving part. However, the rotation speed is not necessarily the same, because the power passes through the speed adjustment device during the process from the input wheel 100 to the output wheel 200, and the power is expanded or reduced, so that the rotation speed of the output wheel 200 is greater than the rotation speed of the input wheel 100 or less than the rotation speed of the input wheel 100, and the output wheel 200 drives the rear wheel to rotate. In this way, when the user's foot rotates one circle, the rotation angle of the output wheel 200 changes, and the magnitude of the change is related to the speed ratio adjusted in the speed adjustment device.

[0045] In the above introduction, when the user stops pedaling, the bicycle will still move forward, so the output wheel 200 and the rear wheel are not fixedly connected, but when the output wheel 200 rotates, it will drive the rear wheel to rotate, and when the output wheel 200 stops rotating, the rear wheel will still rotate. This part of the principle has been disclosed, so it will not be introduced in this application.

[0046] Therefore, it can be understood that when the continuously variable transmission is installed on the front wheel, the second gear 700 is fixedly connected to the output wheel 200, and the output wheel 200 is fixedly connected to the gear at the rear wheel through a chain to transmit power to drive the rear wheel to rotate.

[0047] Now let's introduce the continuously variable transmission. The output wheel 200 and the input wheel 100 introduced above are both components of the continuously variable transmission. The continuously variable transmission also includes a first fixing member 610 and a second fixing member 620. The task of the first fixing member 610 is to bring the power of the input wheel 100 into the speed adjustment device, and the task of the second fixing member 620 is to bring the power of the speed adjustment device out to the output wheel 200. Now remember that the first fixing member 610 and the second fixing member 620 can complete the task, and how to complete it will be described in detail later in this article.

[0048] Before we understand how to change gears, we might as well understand how to transmit power.

[0049] See also Figure 2 , Figure 2 The schematic diagram of the assembly of the continuously variable transmission is shown. Figure 2 It can be seen that the speed adjustment device includes a speed adjustment wheel 300, and both sides of the speed adjustment wheel 300 are provided with multiple accommodating grooves 310 with a length extending radially along the speed adjustment wheel 300 and arranged circumferentially, and the multiple accommodating grooves 310 are used to place multiple locking members 400.

[0050] See also Figure 3a The locking member 400 is a component that connects the speed adjustment wheel 300 and the input wheel 100 and the output wheel 200. Taking the input wheel 100 as an example, one end of the locking member 400 is in the accommodating groove 310, and the remaining part is in the annular groove of the input wheel 100. Assuming that at least one locking member 400 is fixedly connected to the input wheel 100 in the annular groove, the rotation of the input wheel 100 through the locking member 400 drives the speed adjustment wheel 300 to rotate, and the rotation of the speed adjustment wheel 300 drives the locking member 400 on the other side to rotate, and the remaining part of the locking member 400 on this side is also in the annular groove of the output wheel 200, and at least one of the locking members 400 is also fixedly connected to the output wheel 200, so that the output wheel 200 is driven to rotate. At this time, the rotation speeds of the two locking members 400 that transmit power are the same (if not specified, the speed only refers to the speed, ignoring the speed direction), and the power is not amplified or reduced at this time.

[0051] Therefore, in order to achieve speed change, the rotation linear speeds of the two locking members 400 need to be different. Both the input wheel 100 and the output wheel 200 have annular mounting grooves. The multiple locking members 400 in the first group of the two groups are placed in the mounting groove of the input wheel 100, and the multiple locking members 400 in the second group are placed in the mounting groove of the output wheel 200. This is to limit the displacement of the locking members 400 relative to the input wheel 100 or the output wheel 200 in the radial direction. Therefore, the two groups of locking members 400 on both sides of the speed adjustment wheel 300 are respectively arranged to form a circle, and the center of the circle is the center of the input wheel 100 and the center of the output wheel 200. This application realizes that the positions of the locking members 400 in the receiving groove 310 are different by eccentrically setting the speed adjustment wheel 300 so that its center does not coincide with the center of the input wheel 100, resulting in different linear speeds of the locking members 400 on the same side.

[0052] In the embodiment provided in the present application, the circles formed by the two groups of locking members 400 have the same radius and are coaxially arranged in parallel, and the radii of the input wheel 100 and the output wheel 200 are also the same.

[0053] See also Figure 3b , Figure 3b The speed change principle diagram is shown. At this time, the speed change adjustment wheel 300 on the way is eccentrically set relative to the input wheel 100. Since the locking member 400 is restricted from radial movement by the mounting grooves of the input wheel 100 and the output wheel 200, the multiple locking members 400 are still arranged in a circle, but their positions in the receiving groove 310 are different. As the speed change adjustment wheel 300 deviates, some locking members 400 move to the outside of the receiving groove 310, some locking members 400 move to the inside of the receiving groove 310, closer to the center of the speed change adjustment wheel 300, and some are located in the middle of the receiving groove 310.

[0054] At this time, when the speed adjustment wheel 300 rotates, the multiple locking members 400 will still rotate around the center of the input wheel 100, because they are all in the annular grooves of the input wheel 100 and the output wheel 200, but they will also produce relative sliding in the receiving groove 310 during the rotation process. This is because the rotation center of the speed adjustment wheel 300 and the rotation center of the locking member 400 are different, and the locking member 400 needs to make up for the speed difference (including size and direction) between it and the speed adjustment wheel 300 by sliding. It can be seen from Figure 3 that the instantaneous linear velocity of the locking member 400 at M is greater than the instantaneous linear velocity of the locking member 400 at N.

[0055] Therefore, during the rotation process, the instantaneous linear velocity of a certain point in space is constant, and the locking member 400 passing through this point will always have this instantaneous linear velocity. When the locking member 400 approaches the center of the speed adjustment wheel 300, the instantaneous linear velocity decreases continuously until it is minimum. When the locking member 400 moves away from the center of the speed adjustment wheel 300, the instantaneous linear velocity increases continuously until it is maximum.

[0056] Therefore, we just need to find a way to make the locking member 400 passing through this point in space fixedly connected to the input wheel 100, and make the locking member 400 passing through another point fixedly connected to the output wheel 200. In this way, the input wheel 100 will continuously input power to the locking member 400 at this point, and the locking member 400 at this point will also continuously input power to the speed adjustment wheel 300 to make it rotate continuously, and then the power will be continuously output to the output wheel 200 through the locking member 400 passing through a certain point on the other side. Isn't the expansion or reduction of power completed?

[0057] There are two requirements here. The first is that the two points cannot overlap in the axial direction. If they overlap, the linear speeds of the locking members 400 on both sides will be the same when passing through the point, and the speed change cannot be achieved. The second requirement is that the locking member 400 passing through this point needs to be fixedly connected to the input wheel 100 / output wheel 200, and the locking member 400 leaving this point needs to be disconnected from the input wheel 100 / output wheel 200.

[0058] For the first requirement see Figure 2 The continuously variable transmission includes a first fixing member 610 and a second fixing member 620. The first fixing member 610 and the second fixing member 620 are located on both sides of the speed adjustment wheel 300, and do not overlap or do not completely overlap along the axial direction. As long as the first fixing member 610 fixes the locking member 400 passing through it on the input wheel 100, and the second fixing member 620 fixes the locking member 400 passing through it on the output wheel 200, this is the center line connecting the two fixed locking members 400 and the speed adjustment wheel 300. There is an angle between the two lines, and the instantaneous linear speeds of the two locking members 400 are different, so the first problem can be solved.

[0059] Regarding the second requirement, since a point is a physical concept and there is no particle that does not occupy a volume in reality, the first fixing member 610 in the present application will fix and lock the locking member 400 to the input wheel 100 for a distance. At different positions within this distance, the linear velocity of the locking member 400 will continue to change. Assuming that the user exerts force to make the input wheel 100 rotate at a constant speed, the locking member 400 will follow the constant rotation. At this time, the sliding speed of the locking member 400 in the receiving groove 310 will change linearly, and the locking member 400 will be closer to the outside or inside of the receiving groove 310. Since the angular velocity of the locking member 400 will not change, the rotation of the speed adjustment wheel 300 will become faster or slower. Since the output wheel 200 is a passive part, the speed adjustment wheel 300 is required to drive the locking member 400 to transmit power. Since the speed adjustment wheel 300 does not rotate at a constant speed, the instantaneous linear velocity of the locking member 400 will become larger as the locking member 400 slides to the outermost side of the receiving groove 310. This part of the speed is composed of the maximum speed of the speed adjustment wheel 300 rotating at a constant speed plus the vector sum of the speed change of the speed adjustment wheel 300. When reflected on the bicycle, since the linear velocity changes more obviously within a unit distance, the running speed of the bicycle will fluctuate. However, the distance between the first locking member 400 is very small, and the second change time is very short, so the overall speed change of the bicycle is very small, and the user cannot feel this change.

[0060] Therefore, we still need to solve two problems. The first problem is how to make the first fixing member 610 / the second fixing member 620 fix the locking member 400 and the input wheel 100 / the output wheel 200, and the second problem is how to make the speed adjustment wheel 300 offset.

[0061] For the first question, this is also the answer to how the first fixing member 610 and the second fixing member 620 mentioned above complete their tasks. Figure 4a , Figure 4b and Figure 5 , Figure 4a and Figure 4b The structural diagram of the locking member 400 is shown. Figure 5 A schematic diagram of the structure of the first fixing member 610 and the second fixing member 620 is shown. The first fixing member 610 and the second fixing member 620 have the same structural principles.

[0062] The locking member 400 includes a limiting portion 410 received in the receiving groove 310, and a base 420 located in the annular groove. The limiting portion 410 can rotate relative to the base 420 to facilitate reciprocating movement in the receiving groove 310. A movable component is provided inside the base 420. The limiting portion 410 is rotatably connected to the base 420. The limiting portion 410 is for the convenience of reciprocating movement in the receiving groove 310. The base 420 has a receiving cavity 421, see Figure 4d , Figure 4dThe cross-sectional shape diagram of the accommodating cavity 421 is shown. The bottom surface of the accommodating cavity 421 is an inclined first slope 422, and the bottom surface faces the direction of rotation of the input wheel 100 / output wheel 200 from low to high.

[0063] participate Figure 4a and Figure 4c , Figure 4c The top view of the locking member 400 is shown. Specifically, the movable assembly includes a pushing portion 431, a moving portion 432, a resisting portion 433, a first spring 434, and a second spring 435. The moving portion 432 is the resisting portion 433, and the first spring 434, the resisting portion 433, and the moving portion 432 are arranged in sequence and fixedly connected. The other end of the first spring 434 resists against the side wall of the accommodating cavity 421, and the other end of the moving portion 432 resists against the other side wall of the accommodating cavity 421. When the locking member 400 passes through the pressing portion 630 on the first fixing member 610, the pressing portion 630 will push the pushing portion 431 in the movable assembly along the first direction, so the pushing portion 431 will push the moving portion 432 to move in the first direction, where the first direction is the axial direction of the input wheel 100. At the same time, the pushing portion 431 and the moving portion 432 are slidably connected in the second direction, where the second direction is perpendicular to the first direction. The side wall of the accommodating chamber 421 near the moving part 432 also has a second inclined surface 423 extending outward, so as the pushing part 431 moves, a space appears on the side of the moving part 432 away from the abutting part 433, and the first spring 434 will push the abutting part 433 to move toward the moving part 432. Since the bottom surface is inclined and is lower than the first spring 434, the abutting part 433 will also move to the upper side of the accommodating chamber 421 away from the bottom surface, until it extends out of the accommodating chamber 421 and touches the groove wall of the input wheel 100, generating a locking force and forming an overrunning clutch. At this time, the locking member 400 is fixedly connected to the input wheel 100, and the input wheel 100 drives the locking member 400 to rotate.

[0064] The other end of the moving part 432 away from the pressing part 630 has a second spring 435 with a stronger elastic force than the first spring 434. When the locking member 400 is separated from the pressing part 630, the second spring 435 will reset and push the moving part 432 to move in the opposite direction, thereby squeezing the moving part 432 out of the inclined surface on the side wall of the accommodating cavity 421. The moving part 432 pushes the abutting part 433 from the higher bottom surface to the lower inclined surface, breaking away from the connection relationship with the input wheel 100. At this time, the next locking member 400 has begun to pass the first fixing member 610.

[0065] See also Figure 4b ,from Figure 4bIt can be seen that there is a certain width between the limiting part 410 and the pushing part 431 of the locking member 400, the outer circumference of the first fixing member 610 and the second fixing member 620 is inserted between the limiting part 410 and the pushing part 431, and the pressing part 630 extends toward the pushing part 431, so that it partially overlaps with the pushing part 431 in the vertical direction of the axis of the installation shaft 500. Therefore, the pressing part 630 provided on the first fixing member 610 and the second fixing member 620 occupies a part of the rotation space of the pushing part 431, so when the locking member 400 rotates to this part of the space, the pressing part 630 will force the pushing part 431 to leave this space, thereby achieving the effect of pushing the moving part 432.

[0066] In the above embodiment, the pressing part 630 needs to meet a condition, that is, the length of the pressing part 630 along the circumferential direction should meet the requirement that when the speed ratio is adjusted to the maximum, the distance between the two locking members 400 with the largest angular velocity is the largest, and the length of the pressing part 630 cannot be less than this length, otherwise it may fail. Of course, this is related to the installation position of the first fixing member 610 and the second fixing member 620. When the first fixing member 610 and the second fixing member 620 are installed at the positions with the maximum angular velocity and the minimum angular velocity, the bicycle can obtain the largest speed ratio range, and the length of the pressing part 630 also needs to be the longest.

[0067] So the second question is, how to achieve the offset of the speed adjustment wheel 300?

[0068] See also Figure 2 In one embodiment, the eccentric adjustment device includes an eccentric wheel 320 and an eccentric member 330. The eccentric wheel 320 can only move but not rotate. The speed adjustment wheel 300 is sleeved on the outer side of the eccentric wheel 320 and rotates around the eccentric wheel 320. The eccentric wheel 320 is provided with a clearance groove 321. The clearance groove 321 has a certain length. When there is no speed change, the speed adjustment wheel 300, the eccentric wheel 320, the input wheel 100, and the output wheel 200 are all concentrically sleeved on the installation shaft 500. The installation shaft 500 can be the installation shaft 500 at the center of the rear wheel. The eccentric wheel 320 can allow the installation shaft 500 to be located at one end of the clearance groove 321, which makes the user ride more effortlessly and easily, or it can be located at the other end of the clearance groove 321, which makes the user ride more laboriously. The user can decide according to his or her riding purpose.

[0069] The eccentric member 330 is fixedly connected to the eccentric wheel 320, and the eccentric member 330 can reciprocate along the extension direction of the clearance groove 321, thereby driving the eccentric wheel 320 and the speed adjustment wheel 300 to be eccentric. At this time, the position of the locking member 400 in the receiving groove 310 changes synchronously. Therefore, as long as the eccentric member 330 is displaced, the eccentric distance of the speed adjustment wheel 300 can be controlled, thereby changing the speed ratio. When the eccentric distance reaches the maximum, that is, when the mounting shaft 500 is located at one end of the clearance groove 321, the speed ratio reaches the maximum or minimum.

[0070] Therefore, the eccentric condition device provided by the present application can make the speed adjustment wheel 300 eccentric to any distance, so the change of the speed ratio is a linear change rather than a point change, thereby realizing non-friction continuous stepless speed change, large torque transmission, high transmission efficiency, variable speed in static state and rotating state, convenient speed regulation, light weight and small size. When used in the field of bicycles and power-assisted bicycles, it can meet people's personalized adjustment needs for pedaling force when riding, and can easily and quickly adjust to the speed ratio people want within the speed range when the bicycle is stopped, riding or gliding.

[0071] Preferably, see Figure 2 The eccentric member 330 is a rack, and a first gear 340 meshing with the rack is also provided on the mounting shaft 500. The first gear 340 is sleeved on the mounting shaft 500 and fixedly connected to the mounting shaft 500. In this way, the user can move the eccentric member 330 by rotating the mounting shaft 500, thereby adjusting the speed ratio. There are many ways to rotate the mounting shaft 500. For example, the user can rotate the dial on the handlebar during riding, and the mounting shaft 500 at the rear wheel is rotated by pulling the steel wire.

[0072] In other embodiments, the eccentric member 330 may be moved without using the first gear 340, but the reciprocating movement of the eccentric member 330 may be directly controlled, for example, the eccentric member 330 is directly pulled to reciprocate along the direction of the clearance groove 321. The connection relationship of the first gear 340 and the rack in meshing is relatively stable, and the position limit is reliable, and the position displacement will not occur during the bumpy driving of the bicycle.

[0073] Preferably, see Figure 6 An assembly relationship diagram of the eccentric adjustment device is shown. In one embodiment, the method of moving the eccentric member 330 and the eccentric wheel 320 in the same direction in the present application is achieved by providing a snap-in groove 322 in the eccentric wheel 320. This not only reduces the volume in the axial direction of the installation shaft 500, but also facilitates subsequent disassembly, assembly and maintenance.

[0074] In other embodiments, the eccentric member 330 and the eccentric wheel 320 may also be fixedly connected together, such as by threaded connection or welding.

[0075] In one embodiment, referring to FIG. 4 or Figure 6 It can be seen that in the assembly relationship, the first fixing member 610 and the second fixing member 620 are not installed at the positions with the maximum and minimum angular velocities. This is because before the eccentricity is eliminated, the speed adjustment wheel 300, the eccentric wheel 320, the input wheel 100, and the output wheel 200 are concentric. When offset, the speed adjustment wheel 300 has two offset directions, so when the angular velocity of the locking member 400 on one side of the eccentric groove can be either the minimum or the maximum, when the length of the pressing portion 630 is greater than the distance between the two locking members 400 with the maximum angular velocity, then this length may accommodate three or even four locking members 400 with the minimum angular velocity, and in this way, the force on the input wheel 100 / output wheel 200 is more complicated, which is easy to reduce the service life.

[0076] Therefore, preferably, in one of the embodiments, in order to obtain a larger speed ratio range, the clamping portion 630 on the first fixing member 610 and the clamping portion 630 of the second fixing member 620 are symmetrically arranged along the axis center of the mounting shaft 500, and the clamping portion 630 is arranged close to both ends of the length direction of the eccentric groove, for example, the angle between the line connecting the first fixing member 610 and the second fixing member 620 and the line connecting the eccentric groove is 5°-30°. In this way, it is calculated that the length of the clamping portion 630 can accommodate two locking members 400. When the abutting portion 433 of the locking member 400 extends out to abut on the output wheel 200, the two will form an overrunning clutch. The locking force between the two is sufficient to enable the locking member 400 to drive the output wheel 200 to rotate synchronously. When the next locking member 400 enters the clamping portion 630 and also abuts against the output wheel 200, the locking member 400 with a faster angular velocity between the two will become the active member to drive the output wheel 200 to rotate, and the one with a slower angular velocity will become the driven member and no longer provide locking force to the output wheel 200.

[0077] Preferably, in order to further save space volume, make the assembly more compact, and reduce the weight of parts, refer to Figure 2 An open groove 640 is installed on the first fixing member 610, and the open groove 640 and the clamping groove 322 are arranged correspondingly, so that a part of the eccentric member 330 is located in the clamping groove 322, and the other part can be located in the open groove 640, the first fixing member 610 and the eccentric wheel 320 can be close to each other, and the clamping portion 630 of the first fixing member 610 can be directly inserted between the limiting portion 410 and the pushing portion 431 of the locking member 400.

[0078] It can be understood that the eccentric member 330 can be arranged on the side of the first fixing member 610 or on the side of the second fixing member 620 , and in this case, the second fixing member 620 only needs to be provided with a mounting groove.

[0079] Therefore, in combination with the embodiment of the first gear 340, the first gear 340 can also be sleeved inside the eccentric wheel 320. However, it should be noted that the interior of the eccentric wheel 320 is divided into two parts, one part is used to set the eccentric groove, and the other part is used to install the first gear 340. At the same time, there is no connection between the inner wall of the eccentric wheel 320 and the teeth of the first gear 340. During the rotation of the first gear 340, the eccentric wheel 320 will not rotate but will be offset. Therefore, the diameter of the internal space of the eccentric wheel 320 used to accommodate the first gear 340 needs to be much larger than that of the first gear 340. When the eccentric distance of the eccentric wheel 320 is the largest, the first gear 340 still does not contact the eccentric wheel 320.

[0080] See also Figure 1 In one embodiment, a magnetic device 350 is provided at the groove edge of the receiving groove 310 of the speed adjustment wheel 300. The magnetic device 350 is generally a magnet. Due to factors such as manufacturing process errors and assembly tolerances, the diameter of the limiting portion 410 of the locking member 400 is slightly narrower than the groove width of the receiving groove 310. In order to ensure a better riding experience during driving, the magnetic device 350 is installed to ensure that the locking member 400 on the input wheel 100 side can always drive the speed adjustment wheel 300, and the speed adjustment wheel 300 can also always drive the locking member 400 on the output wheel 200 side.

[0081] In other embodiments, some adjustments may be made to some of the structures and assembly relationships, such as:

[0082] The radial outer movement of the locking member 400 needs to be limited by the inner walls of the input wheel 100 and the output wheel 200 , but the radial inner movement of the locking member 400 can be limited by other circular objects, such as bearings.

[0083] In the embodiment provided in the present application, the locking of the locking member 400 and the input wheel 100 or the output wheel 200 forms an overrunning clutch. In other embodiments, the locking relationship between the two can be achieved by abutting the abutting portion 433 of the locking member 400 against the side of the input wheel 100 or the output wheel 200 facing the speed adjustment wheel 300: specifically, the clamping portion 630 can directly push the abutting portion 433 to move in the first direction until it abuts against the input wheel 100 or the output wheel 200, without changing the movement direction through the moving portion 432 and the second inclined surface 423. However, since the speed ratio changes linearly, and the setting of the limiting abutment 433 on the side of the input wheel 100 and the output wheel 200 cannot change linearly, even if a lot of limiting parts 410 are used to engage the abutment 433, there will be a distance between the limiting parts 410 and the limiting parts 410, so the locking member 400 will idle and cause the power to be disconnected. However, due to the high speed, the disconnection time will be very short and will basically not affect the user's riding state.

[0084] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A continuously variable transmission, characterized in that: include: A power transmission device comprises an input wheel (100), an output wheel (200), a speed adjustment wheel (300) and a plurality of locking members (400); the input wheel (100) and the output wheel (200) are coaxially arranged and mounted on both sides of the speed adjustment wheel (300); a plurality of receiving grooves (310) are arranged on both sides of the speed adjustment wheel (300) and extend in a radial direction and are arranged along the circumference of the speed adjustment wheel (300); the plurality of locking members (400) are divided into two groups, the two groups of locking members (400) are arranged to form two concentric circles, and the two groups of locking members (400) are respectively located between the input wheel (100) and the speed adjustment wheel (300), and between the speed adjustment wheel (300) and the output wheel (200); the plurality of locking members (400) are slidably matched with the plurality of receiving grooves (310) in a one-to-one correspondence; The speed-changing adjustment wheel (300) is at any position, and at least one of the locking members (400) in one group is locked to the input wheel (100), and the input wheel (100) is used to input power to drive the speed-changing adjustment wheel (300) to rotate, and at least one of the locking members (400) in the other group is locked to the output wheel (200) to drive the output wheel (200) to rotate; A locking member (400) locked to the input wheel (100) and a locking member (400) locked to the output wheel (200), wherein a line connecting the two and the center of the speed adjustment wheel (300) has an angle; An eccentric adjustment device is transmission-connected to the speed-changing adjustment wheel (300), and is used to drive the speed-changing adjustment wheel (300) to move along the diameter direction of the input wheel (100) so as to adjust the position of a locking member (400) that is ultimately locked to the input wheel (100) and ultimately locked to the output wheel (200) in a corresponding receiving groove (310).

2. The continuously variable transmission according to claim 1, characterized in that: The continuously variable transmission further comprises a mounting shaft (500), and the input wheel (100), the speed adjustment wheel (300) and the output wheel (200) are all rotatably matched to the mounting shaft (500); The eccentric adjustment device comprises an eccentric wheel (320), an eccentric member (330) and a first gear (340); the eccentric wheel (320) is provided with a clearance groove (321) whose length extends in a direction perpendicular to the axis of the installation shaft (500); the eccentric wheel (320) is sleeved on the installation shaft (500) through the clearance groove (321); the eccentric wheel (320) is concentrically arranged with the speed adjustment wheel (300) and is rotatably connected; The eccentric member (330) is fixedly connected to the eccentric wheel (320), the first gear (340) is fixedly connected to the mounting shaft (500) and meshes with the eccentric member (330), and the mounting shaft (500) is configured to rotate by an external force, thereby driving the first gear (340) to rotate around its own axis, so as to drive the eccentric member (330) to move along the length direction of the clearance groove (321).

3. The continuously variable transmission according to claim 2, characterized in that: A clamping groove (322) is provided on the side of the eccentric wheel (320), and the eccentric piece (330) is at least partially located in the clamping groove (322) and is clamped with the eccentric wheel (320).

4. The continuously variable transmission according to claim 1, characterized in that: A magnetic device (350) is provided at the groove edge of the receiving groove (310), and the magnetic device (350) is used to drive the locking member (400) to be close to the groove edge.

5. The continuously variable transmission according to claim 1, characterized in that: The power transmission device further comprises a fixing mechanism, the fixing mechanism being relatively stationary relative to the axis of the input wheel (100), the fixing mechanism being provided with a pressing portion (630), the pressing portion (630) being arranged along the rotation path of the locking member (400), and the length of the pressing portion (630) being greater than the maximum length between two adjacent locking members (400); The locking member (400) comprises a limiting portion (410), a base (420), and a movable component, wherein the limiting portion (410) is connected to the base (420) and is located on a side of the base (420) facing the speed adjustment wheel (300), the limiting portion (410) is slidably connected to the receiving groove (310), and the movable component is located in the base (420); When the locking member (400) rotates to the pressing portion (630), the pressing portion (630) pushes the movable component to extend out of the base (420) and abuts against the output wheel (200) or the output wheel (200) to complete locking.

6. The continuously variable transmission according to claim 5, characterized in that: The fixing mechanism comprises a first fixing member (610) and a second fixing member (620), which are distributed on both sides of the speed adjustment wheel (300) and are both provided with a clamping portion (630), and the two clamping portions (630) are centrally symmetrically arranged along the axis.

7. The continuously variable transmission according to claim 5, characterized in that: The movable assembly comprises a pushing portion (431), a moving portion (432), a resisting portion (433), a first spring (434) and a second spring (435); The base (420) is provided with a receiving cavity (421) and the opening is toward the input wheel (100) or the output wheel (200); the bottom surface of the receiving cavity (421) is provided with a first inclined surface (422) and is arranged from low to high from the first spring (434) to the moving part (432); the first inclined surface (422) is used to support the abutting part (433); The first spring (434), the abutting portion (433) and the moving portion (432) are located in the accommodating cavity (421) and are arranged in sequence; one end of the first spring (434) away from the abutting portion (433) is fixedly connected to a first side wall of the accommodating cavity (421); the pressing portion (630) is used to push the pushing portion (431) along a first direction; the pushing portion (431) and the moving portion (432) are slidably connected along a second direction; wherein the first direction is the axial direction of the input wheel (100), and the second direction is perpendicular to the first direction; A second inclined surface (423) is provided on a second side wall of the accommodating cavity (421) corresponding to the first side wall, and the moving portion (432) can move along the second inclined surface (423) in the first direction and the second direction at the same time, so that the first spring (434) pushes the abutting portion (433) to move from a low position to a high position of the first inclined surface (422) until the accommodating cavity (421) is extended from the opening to abut against the inner wall of the input wheel (100) or the output wheel (200); The elastic force of the second spring (435) is greater than the elastic force of the first spring (434); one end of the second spring (435) is fixedly connected to the inner wall of the accommodating cavity (421); and the other end of the second spring (435) is fixedly connected to the pushing portion (431); the second spring (435) is deformed along the second direction; the second spring (435) is used to push the supporting portion (433) back into the accommodating cavity (421) after the pressing portion (630) is separated from the pushing portion (431).

8. The continuously variable transmission according to claim 7, characterized in that: The input wheel (100) and the output wheel (200) both have an annular groove for accommodating the base (420), the openings of the annular grooves both face the speed adjustment wheel (300), the locking member (400) is limited in the annular groove for rotational movement, and the opening of the accommodating cavity (421) faces a groove wall on one side of the annular groove away from the center of the circle.

9. A bicycle, characterized in that: It comprises a continuously variable transmission as claimed in any one of claims 1 to 8, wherein the input wheel (100) is connected to pedal power, and the output wheel (200) is connected to rear wheel power.

10. The bicycle according to claim 9, characterized in that The continuously variable transmission is mounted on a mounting shaft (500) at the center of the rear wheel, and further comprises a second gear (700), the second gear (700) being coaxially fixedly connected to the input wheel (100), the second gear (700) being connected to the pedal transmission via a chain, and the output wheel (200) being fixedly connected to the mounting shaft (500).

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