Middle-mounted one-way tower footing, chain transmission system and vehicle

Abstract

The utility model relates to a middle-mounted one-way tower footing, a chain transmission system and a vehicle. The middle-mounted one-way tower footing is used in cooperation with a five-way joint of a frame and comprises a middle shaft piece, a first end, located outside the five-way joint, of the middle shaft piece is shorter than a second end of the middle shaft piece, and a shaft assembling part is arranged on the outer wall of the second end of the middle shaft piece; the one-way transmission assembly is assembled on the shaft assembling part and comprises an inner core piece, the inner core piece is fixedly assembled with the shaft assembling part, an elastic clamping ring and a plurality of pawl pieces are embedded in the annular outer wall of the inner core piece, and the pawl pieces are limited by the elastic clamping ring and elastically expand towards the circumferential direction of the annular outer wall of the inner core piece; the outer sleeve piece is arranged on the inner core piece in a sleeving mode, and ratchet ring parts assembled with the multiple pawl pieces in a one-way tooth connection and transmission mode are fixedly arranged on the inner wall of the outer sleeve piece; the flying cover piece is arranged on the side, away from the inner core piece, of the outer sleeve piece and is matched with the inner core piece to axially position the outer sleeve piece; the fluted disc part is fixedly assembled with the outer sleeve part so that the fluted disc part and the middle shaft part can be in one-way transmission. The one-way transmission effect of the middle shaft piece is optimized, and potential safety hazards are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of bicycle accessories, in particular to a mid-mounted one-way tower base, a chain transmission system and a vehicle. Background Art

[0002] The freehub is a core transmission component currently used on bicycles or electric bicycles to transmit the power of the wheel hub to the multi-stage flywheel. It is usually assembled on the support shaft of the wheel hub and axially locked to the outside of the wheel hub with a locking nut.

[0003] Conventional freehub products currently on the market can only move in the same direction as the chain, but when the wheel hub drives the flywheel to rotate, and then transmits the power to the sprocket through the chain, the sprocket will drive the middle shaft and the cranks and pedals at both ends of the middle shaft to rotate. Especially for electric bicycles, due to the setting of the hub motor, the freehub is usually installed on the output shaft of the hub motor. When riding, the hub motor will drive the multi-stage flywheel to rotate rapidly, and then transmit the power to the crank and pedals to rotate at high speed, causing unsafe hidden dangers.

[0004] To this end, we propose a mid-mounted unidirectional tower base, a chain transmission system and a vehicle. Utility Model Content

[0005] The embodiments of the present application provide a mid-mounted unidirectional freewheel base, a chain drive system and a vehicle, so as to at least solve the problem in the prior art that the freewheel base is usually installed on the output shaft of the hub motor, and when riding, the hub motor will drive the multi-stage flywheel to rotate rapidly, and then transmit the power to the crank and pedals to rotate at high speed, causing safety hazards.

[0006] In a first aspect, an embodiment of the present application provides a mid-mounted unidirectional freehub, which is used in conjunction with a bottom bracket of a frame, comprising:

[0007] A middle shaft, wherein the middle part is rotatably mounted in the five-way bracket, and the first end of the middle shaft located outside the five-way bracket is shorter than the second end, and the outer wall of the second end is provided with a shaft mounting portion;

[0008] A one-way transmission assembly, which is assembled on the shaft assembly portion and includes:

[0009] An inner core member, which is fixedly assembled with the shaft assembly portion, and has an elastic snap ring and a plurality of ratchet members embedded on its annular outer wall, wherein the ratchet members are used to limit the elastic snap ring and are elastically opened in the circumferential direction toward the annular outer wall of the inner core member;

[0010] An outer sleeve, which is sleeved on the inner core and has a ratchet ring portion fixed on its inner wall and assembled with a plurality of ratchet pieces for one-way gear transmission;

[0011] A flying cover member, which is arranged on a side of the outer sleeve member away from the inner core member and cooperates with the inner core member to axially position the outer sleeve member;

[0012] The toothed disc component is fixedly assembled with the outer sleeve component so that the toothed disc component and the middle shaft component can be transmitted in one direction.

[0013] Optionally, a plurality of hub key portions arranged axially to axially position the toothed disc member are integrally formed on the annular outer wall of the outer sleeve;

[0014] An outer step portion is formed at the first end of the outer sleeve, and an inner locking thread is provided on the inner wall of the second end. The inner locking thread is threadedly connected to an outer locking thread provided at one end of the outer cover to axially position the outer sleeve. The outer cover has an outer step, and the outer step cooperates with the outer step portion to radially position the gear disk component.

[0015] Optionally, two freewheel base bushings are sleeved on the hub key portion and are respectively located on both sides of the sprocket component to adjust the radial position of the sprocket component on the outer sleeve.

[0016] Optionally, an inner core thread is formed on the inner wall of the inner core member, and the inner core thread is fixedly assembled with the shaft mounting thread formed on the annular outer wall of the shaft mounting portion, and the annular outer wall thereof is sequentially formed with a mounting portion and a first external thread portion;

[0017] The first external threaded portion is threadedly assembled with the first internal threaded portion arranged on the inner wall surface of the flying cover member, and a plurality of ratchet grooves for the ratchet member to be movably embedded and assembled are opened on the annular side wall of the assembly portion.

[0018] Optionally, a second ball groove is formed on one end of the inner core away from the first external threaded portion, and a third ball groove is formed on one side of the flying cover toward the inner core;

[0019] Two first ball grooves are symmetrically formed on the inner wall of the outer sleeve, respectively cooperating with the second ball groove and the third ball groove to assemble the bearing balls.

[0020] Optionally, the pawl member is comma-shaped and includes:

[0021] A bottom support portion, which is rotatably assembled with the inner wall surface of the pawl groove;

[0022] A ratchet pawl portion, which is integrally formed with the base portion and is in one-way tooth engagement with the ratchet ring portion;

[0023] A second buckle groove is provided in the middle of the pawl member to limit the pawl member to be located in the pawl groove. The buckle groove has a slope portion, and the slope portion cooperates with the elastic clamping ring to make the pawl portion elastically open and abut against the ratchet ring portion.

[0024] Optionally, the thread fastening direction of the shaft-mounted thread is opposite to the one-way transmission direction of the toothed disc member.

[0025] Optionally, the toothed disc member includes:

[0026] Chain sprockets, with several in number, arranged coaxially and with the wheel diameters decreasing in sequence;

[0027] Sprocket washer rings, with several in number, arranged between two adjacent chain sprockets.

[0028] In a second aspect, an embodiment of the present application provides a chain drive system, including the center-mounted one-way freehub described in the first aspect above, and,

[0029] A crank pedal assembly, which is installed at the end of the middle shaft member;

[0030] A flywheel, which is fixedly connected to the wheel hub and is in transmission connection with the center-mounted one-way freehub through a chain.

[0031] In a third aspect, an embodiment of the present application provides a vehicle, including the center-mounted one-way freehub described in the first aspect above, or the chain drive system described in the second aspect above.

[0032] Compared with the related art, the center-mounted one-way freehub, chain drive system and vehicle provided by the embodiments of the present application have at least the following technical effects:

[0033] By arranging a one-way transmission assembly on the middle shaft member and fixedly assembling the toothed disc member with the one-way transmission assembly, the position of the freehub is moved to the bottom bracket of the frame. In this way, during cycling, the one-way rotation of the middle shaft member driven by the crank pedal assembly can drive the toothed disc member to rotate, while the flywheel rotating with the wheel hub rotates, and the active one-way rotation transmitted to the toothed disc member through the chain does not drive the middle shaft member to rotate, optimizing the one-way transmission effect of the middle shaft member and avoiding the unsafe hidden danger that the rotation of the toothed disc member drives the middle shaft member, thereby causing the crank and pedal to rotate at high speed.

[0034] Details of one or more embodiments of the present application are set forth in the following drawings and description, so that other features, objects, and advantages of the present application will become more clearly understood. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0036] Figure 1 Schematic diagram of the in - center single - direction tower base three - dimensional structure shown according to an exemplary embodiment Figure 1 .

[0037] Figure 2 Schematic diagram of the in - center single - direction tower base three - dimensional structure shown according to an exemplary embodiment Figure 2 .

[0038] Figure 3 Official drawing of the in - center single - direction tower base structure shown according to an exemplary embodiment.

[0039] Figure 4 Exploded view of the in - center single - direction tower base structure shown according to an exemplary embodiment

[0040] Figure 5 Schematic diagram of the in - center single - direction tower base three - dimensional structure shown according to another exemplary embodiment Figure 1 .

[0041] Figure 6 Schematic diagram of the in - center single - direction tower base three - dimensional structure shown according to another exemplary embodiment Figure 2 .

[0042] Figure 7 Official drawing of the in - center single - direction tower base structure shown according to another exemplary embodiment.

[0043] Figure 8 Exploded view of the in - center single - direction tower base structure shown according to another exemplary embodiment

[0044] Figure 9 Cross - sectional view of the in - center single - direction tower base structure shown according to another exemplary embodiment

[0045] Figure 10 Exploded cross - sectional view of the central shaft part structure shown according to an exemplary embodiment

[0046] Figure 11 Exploded view of the single - direction transmission assembly structure shown according to an exemplary embodiment

[0047] Figure 12 Exploded cross - sectional view of the single - direction transmission assembly structure shown according to an exemplary embodiment

[0048] Figure 13 Schematic diagram of the structure of the pawl part shown according to an exemplary embodiment

[0049] Figure 14 Cross - sectional view of the combined structure of the outer sleeve part, inner core part and pawl part shown according to an exemplary embodiment

[0050] Description of the reference numerals in the drawings: Central shaft member 10: square portion 101, first bearing step 102, crank screw hole 103, shaft assembly portion 104, transmission limit step 1041;

[0051] Bearing member 20;

[0052] Bearing cup member 30: bottom bracket thread 301, bottom bracket limit step 302, second bearing step 303;

[0053] One-way transmission assembly 40:

[0054] Outer sleeve member 401: hub key portion 4011, outer step portion 4012, inner locking thread 4013, ratchet ring portion 4014, first ball groove portion 4015;

[0055] Inner core member 402: assembly portion 4021, first external thread portion 4022, second ball groove portion 4023, inner core thread 4024, ratchet pawl groove 4025, ratchet pawl member 405, first loop buckle groove 4026;

[0056] Flywheel cover member 403: first internal thread portion 4031, third ball groove portion 4032;

[0057] Outer cover member 404: outer locking thread 4041, outer covering step 4042;

[0058] Ratchet pawl member 405: bottom support portion 4051, ratchet pawl portion 4052, second loop buckle groove 4053, slope surface portion 4054;

[0059] Elastic snap ring 406;

[0060] Chainring member 50: chainring 501, chainring spacer 502; freehub bushing 60. Detailed implementation manner

[0061] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0062] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0063] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0064] In the related art, the conventional tower base products on the market at present can only move in the same direction following the chain. However, when the hub drives the flywheel to rotate, and then drives the chain to the chainring through the chain drive, the chainring will drive the bottom bracket spindle, the cranks at both ends of the bottom bracket spindle and the pedals to rotate. Especially for electric bicycles, due to the setting of the hub motor, the tower base is usually installed on the output shaft of the hub motor. When riding, the hub motor will drive the multi-stage flywheel to rotate rapidly, and then drive the cranks and pedals to rotate at high speed, causing potential safety hazards.

[0065] Based on the above situation, the embodiments of the present utility model provide a mid-mounted one-way tower base, a chain drive system and a vehicle, which will be elaborated in detail below with reference to specific embodiments and drawings.

[0066] Embodiment 1

[0067] The embodiments of the present utility model provide a mid-mounted one-way tower base. Figure 1 is a schematic perspective view of a mid-mounted one-way tower base shown according to an exemplary embodiment Figure 1 . Figure 2 is a schematic perspective view of a mid-mounted one-way tower base shown according to an exemplary embodiment Figure 2 . Figure 3 is a formal view of the structure of a mid-mounted one-way tower base shown according to an exemplary embodiment. Figure 4 is an exploded view of the structure of a mid-mounted one-way tower base shown according to an exemplary embodiment. Figure 10 is an exploded sectional view of the structure of a bottom bracket spindle member shown according to an exemplary embodiment. As Figures 1 - 4As shown in FIGS. 9 and 10, the center-mounted one-way tower base is used in conjunction with the bottom bracket of a frame.

[0068] Referring to the attached Figure 10 , there is a bottom bracket shaft 10. A middle tube is sleeved in the middle of the bottom bracket shaft 10, and the middle tube is assembled in the bottom bracket. The first end of the bottom bracket shaft 10 located outside the bottom bracket is shorter than the second end. An axle assembly part 104 is provided on the outer wall of the second end. At both ends of the bottom bracket shaft 10, there are square parts 101 for connecting the crank pedal assembly. A crank screw hole 103 is opened at the end of the square part 101. After the crank is installed on the square part 101, a limit screw is installed in the crank screw hole 103 to fix the crank pedal assembly. Two first bearing steps 102 are integrally formed symmetrically in the middle of the bottom bracket shaft 10. Further, the middle tube is located between the two first bearing steps 102 corresponding to the bottom bracket shaft 10. Bearing parts 20 and bearing cup parts 30 are respectively installed from both ends of the bottom bracket shaft 10. The bearing cup part 30 has a bottom bracket thread 301 and a bottom bracket limit step 302 on the outside, and a second bearing step 303 for positioning the bearing part 20 in cooperation with the first bearing step 102 on the inside.

[0069] During assembly, the bottom bracket shaft 10 is installed in the bottom bracket of the frame, and then the bearing part 20 and the bearing cup part 30 are respectively installed from both ends of the bottom bracket shaft 10. The bottom bracket thread 301 of the bearing cup part 30 is assembled with the internal thread of the bottom bracket, so as to position the axial assembly position of the bottom bracket shaft 10 in the bottom bracket, and the bottom bracket shaft 10 can rotate smoothly at the bottom bracket position through the bearing part 20. It can be understood that after the one-way transmission assembly 40 and the chainring part 50 are assembled, the crank pedal assembly is then assembled with the bottom bracket shaft 10, which will be elaborated in detail later.

[0070] Figure 11 FIG. 12 is an exploded view of the structure of the one-way transmission assembly shown according to an exemplary embodiment. Figure 12 FIG. 14 is an exploded sectional view of the structure of the one-way transmission assembly shown according to an exemplary embodiment. Referring to the attached Figures 11 - 12 , the one-way transmission assembly 40 is assembled on the axle assembly part 104 and includes:

[0071] An inner core part 402 is fixedly assembled with the axle assembly part 104. A resilient snap ring 406 and a plurality of pawl parts 405 are embedded on the annular outer wall of the inner core part 402. The pawl parts 405 are limited by the resilient snap ring 406 and elastically open circumferentially towards the annular outer wall of the inner core part 402.

[0072] Figure 13 FIG. 23 is a schematic structural view of the pawl part shown according to an exemplary embodiment. Figure 14 FIG. 25 is a sectional view of the combined structure of the outer sleeve part, the inner core part and the pawl part shown according to an exemplary embodiment. Referring to the attached Figures 13 - 14, an inner core thread 4024 is formed on the inner wall of the inner core member 402, and the inner core thread 4024 is fixedly assembled with the shaft mounting thread formed on the annular outer wall of the shaft mounting portion 104, and the annular outer wall thereof is sequentially formed with a mounting portion 4021 and a first external thread portion 4022; a plurality of ratchet grooves 4025 for movably embedding and assembling the ratchet member 405 are formed on the annular side wall of the mounting portion 4021; a first buckle groove 4026 for accommodating the embedding and assembly of the elastic snap ring 406 is also formed on the annular side wall of the mounting portion 4021;

[0073] Continue to refer to the attached Figures 11 - 13 In this embodiment, the shaft-mounting thread formed on the annular outer wall is fixed by threaded assembly with the inner core thread 4024. It can be understood that the inner core member 402 can also be welded or pinned at the shaft-mounting portion 104 at the second end of the middle shaft member 10.

[0074] Continue to refer to the attached Figure 13 In this embodiment, the pawl member 405 is comma-shaped and includes:

[0075] The bottom support portion 4051 is rotatably assembled with the inner wall surface of the pawl groove 4025;

[0076] The ratchet pawl portion 4052 is integrally formed with the base portion 4051 and is in one-way tooth engagement with the ratchet ring portion 4014;

[0077] The second ring buckle groove 4053 is opened in the middle part of the pawl member 405 to limit the pawl member 405 to be located in the pawl groove 4025, and after the pawl member 405 is assembled, the second ring buckle groove 4053 and the first ring buckle groove 4026 are located at the same horizontal position, and the ring buckle groove 4053 is provided with a slope portion 4054, and the slope portion 4054 cooperates with the elastic snap ring 406 to make the pawl portion 4052 elastically open and abut against the ratchet ring portion 4014; further, it can be understood that the elastic opening angle α of the pawl portion 4052 is preferably 83.39°-99.83°, wherein the elastic opening angle α is the intersection angle between the line connecting the rotation base point of the base support portion 4051 to the rotation center of the inner core member 402 and the head and tail connecting line of the pawl portion 4052.

[0078] The outer sleeve 401 is sleeved on the inner core 402 and has a ratchet ring 4014 fixed on the inner wall thereof for one-way gear transmission assembly with a plurality of ratchet pawls 405;

[0079] The flying cover member 403 is arranged on the side of the outer set member 401 away from the inner core member 402, and cooperates with the inner core member 402 to axially position the outer set member 401; specifically, the first external thread portion 4022 on the inner core thread 4024 is threadedly assembled and fixed with the first internal thread portion 4031 arranged on the inner wall surface of the flying cover member 403 to axially position the outer set member 401;

[0080] In this embodiment, continue to refer to the appendix Figures 13 - 14 , at one end of the inner core member 402 away from the first external thread portion 4022, a second ball groove portion 4023 is formed, and on one side of the flip cover member 403 facing the inner core member 402, a third ball groove portion 4033 is formed; on the inner wall of the outer sleeve member 401, two first ball groove portions 4015 are symmetrically formed, which are respectively matched with the second ball groove portion 4023 and the third ball groove portion 4033 to assemble bearing balls.

[0081] In the above technical solution of this embodiment, a plurality of pawl members 405 are pre-assembled in the pawl groove 4025 on the circumference of the inner core member 402 through an elastic snap ring 406, and the pawl members 405 are elastically opened circumferentially towards the annular outer wall of the inner core member 402 under the elastic force of the elastic snap ring 406; lubricating grease is pre-applied in the two first ball groove portions 4015 of the outer sleeve member 401 and bearing balls are loaded.

[0082] The inner core member 402 is inserted into the second end of the central shaft member 10 and is fixed to the central shaft member 10 through the cooperation of the inner core thread 4024 and the shaft-mounted thread. Then, the outer sleeve member 401 and the flip cover member 403 are sequentially installed. The flip cover member 403 is placed in the outer sleeve member 401. After the first external thread portion 4022 of the inner core member 402 is threadedly assembled with the first internal thread portion 4031 of the flip cover member 403, the outer sleeve member 401 axially limits the inner core member 402 and the flip cover member 403, and the outer sleeve member 401 realizes one-way rotation relative to the inner core member 402 through the bearing balls on both sides. Continue to refer to the appendix Figure 14 , taking the outer sleeve member 401 that can rotate clockwise during assembly and riding as an example, when traveling, when the central shaft member 10 is driven by the crank pedal assembly to rotate clockwise, at this time, the pawl member 405 meshes with the teeth of the ratchet ring portion 4014, driving the outer sleeve member 401 to rotate clockwise synchronously; when the outer sleeve member 401 is driven by an external force to rotate clockwise, the ratchet ring portion 4014 moves clockwise relative to the pawl member 405. At this time, the ratchet ring portion 4014 does not drive the pawl member 405 unidirectionally. Combining the settings of lubrication and bearings, the friction coefficient is reduced, and the central shaft member 10 moves.

[0083] In this embodiment, refer to the appendix Figures 1 - 4 , on the annular outer wall of the outer sleeve member 401, a plurality of hub key portions 4011 are integrally formed and arranged axially to axially position the sprocket member 50.

[0084] The sprocket member 50 is fixedly assembled with the outer sleeve member 401 so that the sprocket member 50 is in one-way transmission with the central shaft member 10.

[0085] Continue to refer to the appendix Figures 1 - 4 , in this embodiment, on the annular outer wall of the outer sleeve member 401, a plurality of hub key portions 4011 are integrally formed and arranged axially to axially position the sprocket member 50.

[0086] The first end of the outer sleeve 401 is formed with an outer step portion 4012, and an inner locking thread 4013 is provided on the inner wall of its second end. The inner locking thread 4013 is threadedly connected to the outer locking thread 4041 provided at one end of the outer cover 404 to axially position the outer sleeve 401. The outer cover 404 has an outer covering step 4042, and the outer covering step 4042 cooperates with the outer step portion 4012 to radially position the sprocket member 50.

[0087] Further, continue to refer to the appendix Figures 1 - 4 Two freehub bushings 60 are sleeved on the freehub key portion 4011 of the outer sleeve 401 and are respectively located on both sides of the sprocket member 50 to adjust the radial position of the sprocket member 50 on the outer sleeve 401.

[0088] In this embodiment, the sprocket member 50 has a single gear structure. Therefore, the position of the sprocket member 50 corresponding to the flywheel on the hub can be adaptively adjusted by the thickness of the two freehub bushings 60, so as to be adapted to different assembly widths and different specifications of flywheels.

[0089] In the above technical solution of this embodiment, after the one-way drive assembly 40 is installed, the freehub bushings 60 - sprocket member 50 - freehub bushings 60 are sequentially installed on the freehub key portion 4011 of the outer sleeve 401. The assembly of the freehub key portion 4011 and the sprocket member 50 completes the axial positioning. The outer cover 404 is installed at the second end of the outer sleeve 401 and is locked and fixed by the outer locking thread 4041 and the inner locking thread 4013. The outer covering step 4042 of the outer cover 404 cooperates with the outer step portion 4012 and the two freehub bushings 60 to radially position the sprocket member 50;

[0090] After the above steps are assembled, the crank pedal assembly is installed on the two square portions 101 of the bottom bracket spindle 10, and locking screws are installed in the crank screw holes 103 to complete the installation of the mid - drive freehub.

[0091] Further, continue to refer to the appendix Figure 4 The thread tightening direction of the shaft - mounted thread on the shaft assembly portion 104 is set in the opposite direction to the one - way drive direction of the sprocket member 50. Furthermore, when the sprocket member 50 drives the bottom bracket spindle 10 to rotate, it drives the inner core member 402 and the shaft assembly portion 104 to be tightly locked, effectively preventing loosening.

[0092] Furthermore, a drive limiting step 1041 is also provided at the assembly position of the shaft assembly portion 104 corresponding to the one - way drive assembly 40, so that the one - way drive assembly 40 is fixed at this axial position and does not interfere with the normal operation of the bottom bracket position.

[0093] In summary, for the center-mounted one-way tower base provided in the embodiment of the present utility model, by arranging a one-way transmission assembly 40 on the central shaft member 10 and fixedly assembling the sprocket member 50 with the one-way transmission assembly 40, the position of the tower base is thus migrated to the bottom bracket of the vehicle frame. In this way, it is realized that the one-way rotation of the central shaft member 10 during riding can drive the sprocket member 50 to rotate, while the active one-way rotation of the sprocket member 50 does not drive the central shaft member 10 to rotate, optimizing the one-way transmission effect of the central shaft member 10 and avoiding the sprocket rotation driving the central shaft member 10, thereby causing the crank and the pedal to rotate at high speed and posing a safety hazard.

[0094] Embodiment 2

[0095] Embodiment 2 of the present utility model provides a center-mounted one-way tower base, Figure 5 which is a schematic perspective view of the center-mounted one-way tower base shown according to another exemplary embodiment Figure 1 . Figure 6 which is a schematic perspective view of the center-mounted one-way tower base shown according to another exemplary embodiment Figure 2 . Figure 7 which is a formal view of the structure of the center-mounted one-way tower base shown according to another exemplary embodiment. Figure 8 which is an exploded view of the structure of the center-mounted one-way tower base shown according to another exemplary embodiment. Figure 9 which is a sectional view of the structure of the center-mounted one-way tower base shown according to another exemplary embodiment. Referring to the attached Figures 5 - 9 , this center-mounted one-way tower base is equipped with a sprocket member 50 different from that in Embodiment 1. The sprocket member 50 is a sprocket combination, including:

[0096] Chain sprockets 501, with a number of them arranged coaxially and the wheel diameters decreasing in sequence. It can be understood that the sequential decrease of the chain sprockets 501 can be from the inside out or from the outside in, and is set in cooperation with the wheel diameter of the flywheel for easy chain shifting speed regulation;

[0097] Sprocket spacer rings 502, with a number of them arranged between adjacent two chain sprockets 501.

[0098] Other structures not described are as shown in Embodiment 1.

[0099] In summary, for the center-mounted one-way tower base provided in the embodiment of the present utility model, by arranging a one-way transmission assembly 40 on the central shaft member 10 and fixedly assembling the sprocket member 50 with the one-way transmission assembly 40, the position of the tower base is thus migrated to the bottom bracket of the vehicle frame. In this way, it is realized that the one-way rotation of the central shaft member 10 during riding can drive the sprocket member 50 to rotate, while the active one-way rotation of the sprocket member 50 does not drive the central shaft member 10 to rotate, optimizing the one-way transmission effect of the central shaft member 10 and avoiding the sprocket rotation driving the central shaft member 10, thereby causing the crank and the pedal to rotate at high speed and posing a safety hazard.

[0100] Embodiment 3

[0101] Embodiment 3 of the present utility model provides a chain drive system, including the mid-mounted one-way freehub provided in Embodiment 1 or Embodiment 2 above, and,

[0102] A crank pedal assembly, which is installed at the end of the central shaft member 10;

[0103] A flywheel, which is fixedly connected to the wheel hub and is in transmission connection with the mid-mounted one-way freehub through a chain.

[0104] For other structures not described, refer to Embodiment 1 or Embodiment 2.

[0105] In summary, for the mid-mounted one-way freehub and the chain drive system provided in the embodiments of the present utility model, by arranging a one-way transmission assembly 40 on the central shaft member 10 and fixedly assembling the sprocket member 50 with the one-way transmission assembly 40, the position of the freehub is migrated to the bottom bracket of the frame. In this way, during riding, the one-way rotation of the central shaft member 10 driven by the crank pedal assembly can drive the sprocket member 50 to rotate, while the flywheel rotating with the wheel hub rotates, and the active one-way rotation transmitted to the sprocket member 50 through the chain does not drive the central shaft member 10 to rotate, optimizing the one-way transmission effect of the central shaft member 10 and avoiding the unsafe hidden danger that the sprocket member 50 rotates to drive the central shaft member 10, and then causing the crank and the pedal to rotate at high speed.

[0106] Embodiment 4

[0107] Embodiment 4 of the present utility model provides a vehicle, including the mid-mounted one-way freehub provided in Embodiment 1 or Embodiment 2 above, or the chain drive system provided in Embodiment 3 above.

[0108] In this embodiment, the vehicle in this embodiment can be a vehicle with a mid-mounted one-way freehub such as a bicycle, an electric bicycle, a tricycle, or an electric tricycle.

[0109] In summary, for the mid-mounted one-way freehub, the chain drive system and the vehicle provided in the embodiments of the present utility model, by arranging a one-way transmission assembly 40 on the central shaft member 10 and fixedly assembling the sprocket member 50 with the one-way transmission assembly 40, the position of the freehub is migrated to the bottom bracket of the frame. In this way, during riding, the one-way rotation of the central shaft member 10 driven by the crank pedal assembly can drive the sprocket member 50 to rotate, while the flywheel rotating with the wheel hub rotates, and the active one-way rotation transmitted to the sprocket member 50 through the chain does not drive the central shaft member 10 to rotate, optimizing the one-way transmission effect of the central shaft member 10 and avoiding the unsafe hidden danger that the sprocket member 50 rotates to drive the central shaft member 10, and then causing the crank and the pedal to rotate at high speed.

[0110] For other structures not described, refer to Embodiment 1 or Embodiment 2.

[0111] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0112] The above embodiments only express several implementation manners of the present application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A mid-mounted unidirectional freehub, used in conjunction with a bottom bracket of a frame, characterized in that: include: A middle shaft, wherein the middle part is rotatably mounted in the five-way bracket, and the first end of the middle shaft located outside the five-way bracket is shorter than the second end, and the outer wall of the second end is provided with a shaft mounting portion; A one-way transmission assembly, which is assembled on the shaft assembly portion and includes: An inner core member, which is fixedly assembled with the shaft assembly portion, and has an elastic snap ring and a plurality of ratchet members embedded on its annular outer wall, wherein the ratchet members are used to limit the elastic snap ring and are elastically opened in the circumferential direction toward the annular outer wall of the inner core member; An outer sleeve, which is sleeved on the inner core and has a ratchet ring portion fixed on its inner wall for one-way gear transmission assembly with a plurality of ratchet pawl members; A flying cover member, which is arranged on a side of the outer sleeve member away from the inner core member and cooperates with the inner core member to axially position the outer sleeve member; The toothed disc component is fixedly assembled with the outer sleeve component so that the toothed disc component and the middle shaft component can be transmitted in one direction.

2. The mid-mounted one-way tower base according to claim 1, characterized in that: A plurality of hub key portions arranged axially to axially position the toothed disc member are integrally formed on the annular outer wall of the outer sleeve; An outer step portion is formed at the first end of the outer sleeve, and an inner locking thread is provided on the inner wall of the second end. The inner locking thread is threadedly connected to an outer locking thread provided at one end of the outer cover to axially position the outer sleeve. The outer cover has an outer step, and the outer step cooperates with the outer step portion to radially position the gear disk component.

3. The mid-mounted one-way tower base according to claim 2, characterized in that: The hub key portion is sleeved with two freewheel base bushings respectively located on both sides of the sprocket component to adjust the radial position of the sprocket component on the outer sleeve.

4. The mid-mounted one-way tower base according to claim 1, characterized in that: An inner core thread is formed on the inner wall of the inner core member, and the inner core thread is fixedly assembled with the shaft mounting thread formed on the annular outer wall of the shaft mounting portion, and the annular outer wall thereof is sequentially formed with a mounting portion and a first external thread portion; The first external threaded portion is threadedly assembled with the first internal threaded portion arranged on the inner wall surface of the flying cover member, and a plurality of ratchet grooves for the ratchet member to be movably embedded and assembled are opened on the annular side wall of the assembly portion.

5. The mid-mounted one-way tower base according to claim 4, characterized in that: A second ball groove is formed on one end of the inner core away from the first external thread portion, and a third ball groove is formed on one side of the flying cover toward the inner core; Two first ball grooves are symmetrically formed on the inner wall of the outer sleeve, respectively cooperating with the second ball groove and the third ball groove to assemble the bearing balls.

6. The mid-mounted one-way tower base according to claim 4, characterized in that: The ratchet member is comma-shaped and includes: A bottom support portion, which is rotatably assembled with the inner wall surface of the pawl groove; A ratchet pawl portion, which is integrally formed with the base portion and is in one-way tooth engagement with the ratchet ring portion; A second buckle groove is provided in the middle of the pawl member to limit the pawl member to be located in the pawl groove. The buckle groove has a slope portion, and the slope portion cooperates with the elastic clamping ring to make the pawl portion elastically open and abut against the ratchet ring portion.

7. The mid-mounted one-way tower base according to claim 4, characterized in that: The thread fastening direction of the shaft-mounted thread is arranged in the opposite direction to the one-way transmission direction of the toothed disc member.

8. The mid-mounted one-way tower base according to claim 1, characterized in that: The toothed disc member comprises: There are several sprocket wheels, which are coaxially arranged and have decreasing wheel diameters; There are several toothed disk spacers, which are arranged between two adjacent chain toothed disks.

9. A chain transmission system, characterized in that: The invention comprises a mid-mounted one-way tower base as described in any one of claims 1 to 8, and A crank pedal assembly, the crank pedal assembly being mounted on the end of the middle shaft 10; A flywheel is fixedly connected to the wheel hub and is transmission-connected to the mid-mounted one-way freewheel base through a chain.

10. A vehicle, characterized in that: A mid-mounted one-way tower base comprising any one of claims 1 to 8, or The chain drive system of claim 9.

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