CN107839825B - Bicycle expansion brake hub assembly - Google Patents
Bicycle expansion brake hub assembly Download PDFInfo
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- CN107839825B CN107839825B CN201710152677.0A CN201710152677A CN107839825B CN 107839825 B CN107839825 B CN 107839825B CN 201710152677 A CN201710152677 A CN 201710152677A CN 107839825 B CN107839825 B CN 107839825B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62L—BRAKES SPECIALLY ADAPTED FOR CYCLES
- B62L1/00—Brakes; Arrangements thereof
- B62L1/005—Brakes; Arrangements thereof constructional features of brake elements, e.g. fastening of brake blocks in their holders
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
- Y02T10/86—Optimisation of rolling resistance, e.g. weight reduction
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Abstract
The invention discloses a bicycle expanding brake hub assembly which is characterized by comprising a hub, a plurality of brake shoes, a hub shaft, a linkage mechanism, an outer cover plate and a reset piece, wherein the brake shoes and the linkage mechanism are limited in the integrated hub by the outer cover plate, so that the overall size is reduced, the structure is more compact, the weight is reduced, and the assembly and the disassembly are convenient; secondly utilize the brake shoe to expand under the effect of link gear and brake the flower-drum of integral type when braking, reduced original flower-drum because the components of a whole that can function independently sets up the not hard up phenomenon of skidding that appears easily, promote by a wide margin in braking effect.
Description
Technical Field
The invention relates to a bicycle part, in particular to a bicycle expansion brake hub assembly.
Background
With the development of transportation vehicles, the bicycle industry is changing day by day, and people also put forward higher requirements on the performance of bicycles, such as multi-level speed change, large bearing capacity, good shock resistance, durability and particularly good braking capacity. The existing bicycle mainly brakes the hub through the brake device to realize the braking process, so that the braking effect of the bicycle is greatly related to the structures of the front hub and the rear hub, but the structure of the existing hub is complex, the bearing capacity of the assembled hub is small, and the braking performance is poor.
Disclosure of Invention
The invention aims to provide a bicycle expansion brake hub assembly which is compact in structure and good in braking effect.
The technical purpose of the invention is realized by the following technical scheme:
a bicycle expansion brake hub assembly comprising:
the hub is integrally formed by a hub, a middle connecting pipe and a brake drum;
the brake shoes are accommodated and uniformly distributed in the brake drum and can move to abut against the brake drum;
the hub shaft penetrates through the hub and can rotate relative to the hub, and the assembly is fixed on the frame through fasteners at two ends of the hub shaft;
the linkage mechanism is also accommodated in the brake drum and can act on the brake shoes to enable the brake shoes to be separated from the radial distance of the axis of the hub shaft;
the outer cover plate covers one side of the brake drum and is used for limiting the brake shoe and the linkage mechanism in the brake drum;
the reset piece ensures that the brake shoes always have synchronous movement trend of closing towards the axial direction of the hub shaft.
By adopting the technical scheme, the brake shoe and the linkage mechanism are limited in the integrated hub by the outer cover plate, so that the overall size is reduced, the structure is more compact, the weight is reduced, and the disassembly and the assembly are convenient; secondly utilize the brake shoe to expand under link gear's effect and brake the flower-drum of integral type when braking, reduced original flower-drum because the components of a whole that can function independently sets up the not hard up phenomenon of skidding that appears easily, promote by a wide margin in braking effect.
Preferably, the link gear includes skeleton, a plurality of rollers of equipartition on the skeleton, rotates cam and brake spanner, it leaves wheel hub axle axis and takes place radial displacement to rotate a plurality of rollers of cam steerable, the roller offsets with the inboard of brake shoe all the time, and wherein brake spanner is connected with the rotation cam, and when brake spanner application of force braking force brake shoe offsets with the braking drum.
Through adopting above-mentioned technical scheme, utilize the brake spanner to transmit the braking force of applying on rotating the cam, rotate the cam and rotate, promote the roller simultaneously and take place radial movement, utilize the radial movement of roller to make a plurality of brake shoes outwards expand to contradict and brake on the brake drum, the equipment is all dismantled to each accessory, convenient the change.
Preferably, the framework comprises a chassis and limiting blocks which are circumferentially and uniformly distributed on the end face of one side of the chassis, an adjusting groove for accommodating the roller is formed between every two adjacent limiting blocks, a first noise reduction groove is formed in the end face deviating from the protrusion of each limiting block, a through hole is formed in the middle of the chassis, a butting portion is arranged in the through hole, the rotating cam is arranged on the butting portion, and a positioning hole for the hub shaft to penetrate through is formed in the middle of the butting portion.
By adopting the technical scheme, the through hole originally arranged in the middle of the chassis is reduced by the arrangement of the abutting part, and a positioning hole with a smaller hole diameter than that of the through hole is adopted instead of the through hole for the through arrangement of the hub shaft, so that the requirement on the installation precision of the hub shaft is improved, the radial play is reduced, the coaxiality between the hub shaft and the hub during installation is improved, and the shaking is reduced; secondly, the axial movement of one side of the rotating cam is limited by the abutting part, so that the installation of the rotating cam is facilitated; and the first noise reduction groove formed in the limiting block firstly reduces the manufacturing cost of the framework, reduces the contact area with the brake drum, and reduces the noise of the first noise reduction groove and the brake drum during friction.
Preferably, the abutting part is connected with the chassis through a plurality of circumferentially uniformly distributed connecting blocks, and a second noise reduction groove is formed between every two adjacent connecting blocks; the connecting block is corresponding to the position of stopper, and one end is connected with the stopper, and the other end links to each other with butt portion, and wherein deviates from an terminal surface in the stopper and sets up to the arcwall face.
Through adopting above-mentioned technical scheme, the connecting block has still strengthened the intensity effect of stopper and butt portion except playing the effect of connecting butt portion and chassis, has improved the stability of flower-drum at rotation in-process skeleton to utilize the second that forms between two adjacent connecting blocks to fall the noise when the groove further reduces the braking.
Preferably, the rotating cam comprises a connecting portion and a cam portion which are distributed from top to bottom, the connecting portion comprises first lugs which are circumferentially and uniformly distributed on the outer wall, a first limiting groove is formed between every two adjacent first lugs, the brake wrench comprises a connecting disc and a rotating frame, the connecting disc is provided with a mounting hole for accommodating the connecting portion, and second lugs and second limiting grooves which are clamped with the first lugs and the first limiting grooves in a staggered mode are circumferentially and uniformly distributed on the inner wall of the mounting hole.
Through adopting above-mentioned technical scheme, utilize first, second lug and first, the crisscross block connected mode of second spacing groove to make brake spanner and rotation cam realize synchronous rotation, and both installation accuracy is higher to can conveniently realize both dismantlement processes, compact structure.
Preferably, a stepped surface is arranged between the connecting part and the cam part, the connecting disc abuts against the stepped surface and partially covers the upper end surfaces of the rollers, and the cam part comprises cams which are uniformly distributed on the outer wall of the rotating cam in the circumferential direction and a brake release groove which is formed between two adjacent cams.
Through adopting above-mentioned technical scheme, the ladder face uses as the locating surface of brake spanner, further makes things convenient for brake spanner's installation and further promotion of installation accuracy, and the intermittent type emergence radial movement of roller can be realized to the cam and the braking that set up on the secondary cam portion and remove the recess.
Preferably, the outer cover plate is further provided with a third limiting groove for the rotating frame to rotate, and the brake wrench is further provided with a torsion spring which always has a movement trend towards the direction of one side of the braking force; the outer cover plate is further fixedly provided with a dustproof cover, the dustproof cover is provided with a protruding portion, and the protruding portion and the outer cover plate form a fourth limiting groove which is used for enabling the rotating frame part to penetrate out and limiting the rotating angle of the rotating frame.
By adopting the technical scheme, the outer cover plate is used as a limiting linkage mechanism and an accessory for one side of the brake shoe to axially move, and the dustproof cover is arranged to improve the connection firmness of the outer cover plate and prevent impurities from entering the inner part of the outer cover plate; and the combination of the third limiting groove and the fourth limiting groove on the outer cover plate and the dust cover limits the rotation angle of the rotating frame, and the combination of the third limiting groove and the fourth limiting groove on the dust cover and the rotating cam has a better braking effect.
Preferably, the outer wall of the brake shoe is provided with a fifth limiting groove, the reset piece is an annular tension spring which is hooked with each other end to end, and the tension spring is clamped in the fifth limiting grooves of the brake shoes.
Through adopting above-mentioned technical scheme, a plurality of brake shoes utilize the elastic force that resets to draw in inwards and reset when the braking resets, and the extension spring that the piece that resets adopts end to end hook for the elastic force that every brake shoe received is even, can realize the synchronous restoration of a plurality of brake shoes, has effectively avoided when loosening the braking polylith brake shoe because the restoring force is inhomogeneous leads to partial brake shoe still to take place with the condition that the flower-drum contradicted, has reduced the noise duration after the braking.
As preferably, the brake groove has been seted up to the one end of brake drum, be provided with the spacing ring in the brake groove, still be provided with in the brake groove and accomodate an iron ring, link gear is acceptd in this iron ring, the iron ring includes the spacing dish of butt on the brake groove tank bottom, the groove of stepping down that supplies the spacing ring holding is seted up to the spacing dish, first anti-skidding line has been seted up on the inner wall of brake groove, be provided with the second anti-skidding line of contradicting mutually with first anti-skidding line on the outer wall of iron ring. .
Through adopting above-mentioned technical scheme, the setting of hoop replaces the braking system drum and the brake shoe process of rubbing mutually, improves the life of flower-drum, and utilizes the spacing hoop and the spacing hoop of block of each other in the groove of stepping down in radial ascending removal, cooperates the spacing hoop of contradicting mutually of first non-slip texture and second non-slip texture in ascending rotation in week.
Preferably, a first bearing and a second bearing are respectively installed in the faceplate and the brake drum, and the hub shaft is respectively arranged in the first bearing and the second bearing in a penetrating manner.
Through adopting above-mentioned technical scheme, utilize first, second bearing to make between wheel hub shaft and the flower-drum change sliding friction into rolling friction, reduced the relative wearing and tearing between the two, improved life.
In conclusion, the invention has the following beneficial effects:
1. the brake shoe and the linkage mechanism are accommodated in the integrated hub, so that the whole expansion brake structure is more compact;
2. the mounting precision of the hub shaft is improved through the abutting part arranged in the middle of the framework, the noise during braking is reduced through the first noise reduction groove and the second noise reduction groove, and the tension springs which are mutually hooked end to end are used as reset pieces of the brake shoes on the outside, so that the stress of the brake shoes during resetting is more uniform, and the noise duration after braking is shortened;
3. through brake spanner and the split type setting of rotation cam, the dismouting of being convenient for to utilize the combination of third spacing groove and fourth spacing groove on outer apron and the shield to have restricted brake spanner's axial motion, and restricted brake spanner's the biggest turned angle scope, make more stable when the braking.
Drawings
FIG. 1 is an exploded perspective view of a bicycle expansion brake drum assembly according to an embodiment;
FIG. 2 is an elevational view of the expansion brake drum assembly of the bicycle mounted to the frame in accordance with the first embodiment;
FIG. 3 is a side view of the bicycle expansion brake drum assembly mounted to the frame in accordance with one embodiment;
FIG. 4 is a side view of a hub according to one embodiment;
FIG. 5 is a cross-sectional view of a hub according to one embodiment;
FIG. 6 is a schematic front view of the framework according to the first embodiment;
FIG. 7 is a schematic view of a back side of a frame according to an embodiment;
FIG. 8 is a side view of the frame according to one embodiment;
FIG. 9 is a schematic structural view of a brake shoe according to one embodiment;
FIG. 10 is a front view of a reset element according to one embodiment;
FIG. 11 is an exploded view of the rotary cam and the brake wrench according to the first embodiment;
FIG. 12 is a schematic view of a brake wrench limiting the position between an outer cover plate and a dust cap according to an embodiment;
FIG. 13 is a schematic view of the outer cover plate and the frame after being mounted according to the first embodiment;
FIG. 14 is a schematic view of the first embodiment of the torsion spring after being installed between the outer cover and the brake wrench;
FIG. 15 is a schematic view showing the installation position between the brake wrench and the roller according to the first embodiment;
FIG. 16 is a schematic view of a brake drum of the bicycle in accordance with the first embodiment;
FIG. 17 is a diagram illustrating the overall braking of the expansion brake drum of the bicycle in accordance with the first embodiment;
FIG. 18 is a schematic view of the fixing between the outer cover and the frame in the second embodiment;
FIG. 19 is a schematic view of the connection of the multi-stage flywheel and the hub.
In the figure: 1. a framework; 11. a chassis; 12. a limiting block; 13. an adjustment groove; 14. an abutting portion; 141. positioning holes; 15. connecting blocks; 16. a second noise reduction groove; 17. a fixing pin; 18. an arc-shaped surface; 19. a first noise reduction groove; 2. a brake shoe; 21. a fifth limiting groove; 22. an arc-shaped limiting block; 23. a sixth limiting groove; 24. a guide surface; 3. rotating the cam; 31. a connecting portion; 311. a first bump; 312. a first limit groove; 32. a cam portion; 321. a cam; 322. a brake release recess; 33. a step surface; 4. a roller; 5. a brake wrench; 51. a connecting disc; 511. mounting holes; 512. a second bump; 513. a second limit groove; 52. a rotating frame; 521. a fixing hole; 522. a wire pressing screw; 523. locking the nut; 6. a reset member; 61. a head hook; 62. a tail hook; 7. a flower drum; 71. a faceplate; 711. external threads of the faceplate; 72. a middle connecting pipe; 73. braking a drum; 731. a brake groove; 732. a limiting ring; 733. a first anti-skid pattern; 734. a second boss; 74. a conical table; 75. an iron ring; 751. a limiting disc; 752. a yielding groove; 753. a second anti-slip pattern; 754. a first boss; 76. a bearing limiting groove; 8. an outer cover plate; 81. a brake frame; 82. clamping a hoop; 83. a wire passing screw; 84. fixing grooves; 85. a third limiting groove; 86. a limiting pressing block; 87. fixing the spring; 88. a torsion spring; 9. a dust cover; 91. a boss portion; 92. a fourth limit groove; 10. a hub shaft; 10a, flange nuts; 10b, fastening a nut; 10c, a first gasket; 10d, a sleeve; 10e, a second gasket; 10f, fixing the outer cover plate sleeve; 101. a first bearing; 102. a second bearing; 200. a chain stay; 300. a brake cable; 400. a frame; 410. a fixed seat; 411. a limiting socket; 500. a multi-stage flywheel; 510. flywheel internal thread.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Example one
Referring to fig. 1, a bicycle expanding brake hub assembly includes an integrated hub 7 and a hub axle 10 disposed through the hub 7, wherein the hub 7 rotates relative to the hub axle 10.
With reference to fig. 1, 4 and 5, the hub 7 is made of aluminum or iron, preferably aluminum to reduce the overall weight, and includes a hub 71 on both sides, a brake drum 73, and a middle connecting pipe 72 connecting the two. The faceplate 71 and the brake drum 73 are both provided with flanges for connecting spokes, one end face in the brake drum 73 is provided with a brake groove 731, an iron ring 75 is arranged in the brake groove 731, the middle part of the bottom of the brake groove 731 is provided with a raised limiting ring 732, and the outer wall of the limiting ring 732 is provided with a spline; the iron ring 75 comprises a limiting disc 751 abutting against the bottom of the brake groove 731, and the middle part of the limiting disc 751 is provided with a abdicating groove 752 for accommodating the limiting ring 732; first non-slip texture 733 on the inner wall of the braking groove 731, second non-slip texture 753 is arranged on the outer wall of the iron ring 75, when the iron ring 75 is installed in the braking groove 731, the first non-slip texture 733 and the second non-slip texture 753 mutually interfere to enable the iron ring 75 to be limited in the circumferential direction. In addition, the thickness of the limiting disk 751 is equal to that of the limiting ring 732, so that after the iron ring 75 is installed, a concave-convex surface is not formed in the braking groove 731.
In addition, an axial limiting portion is further included between the iron ring 75 and the brake drum 73, the axial limiting portion includes a first boss 754 provided on an outer wall of the iron ring 75 and a second boss 734 provided on a side wall of the brake groove 731, and the second boss 734 is just buckled on an upper end face of the first boss 754, so that the iron ring 75 is limited in the axial direction. The iron ring 75 is heat treated prior to installation to improve wear resistance and is installed into the brake drum 73 by expansion with heat and contraction with cold.
A brake device is arranged in the iron ring 75, and the brake device comprises a plurality of brake shoes 2 which are uniformly distributed in the circumferential direction and a linkage mechanism which is arranged in the middle of the plurality of brake shoes 2. The linkage mechanism comprises a framework 1, a plurality of rollers 4, a body rotating cam 3 and a brake wrench 5.
Referring to fig. 6 and 7, the frame 1 is made of aluminum alloy, and includes a circular chassis 11 and a plurality of limiting blocks 12 disposed on a side end surface of the chassis 11, and a first noise reduction groove 19 is disposed on an end surface of the limiting block 12 away from the protrusion. The chassis 11 has a through hole in the middle, and a plurality of stopper 12 are evenly distributed around this through hole in the circumference, and an adjusting groove 13 for accommodating the roller 4 is formed between two adjacent stopper 12, and the roller 4 can slide a certain radial distance in the adjusting groove 13.
Be provided with one in the central through hole of chassis 11 and be annular butt portion 14, this butt portion 14 is connected with chassis 11 through connecting block 15 of equipartition on the perisporium, and the center department of butt portion 14 offers the locating hole 141 with chassis 11 coaxial line, and connecting block 15's quantity just corresponds with the same and setting position of quantity of stopper 12, forms a second between two adjacent connecting blocks 15 and falls the groove 16 of making an uproar. The end face of the connecting block 15 on the side away from the limiting block 12 is provided with an arc-shaped surface 18, and one side of the arc-shaped surface 18 is connected with the end face of the abutting part 14. In addition, a fixing pin 17 is provided on the end face of one of the limit blocks 12.
Referring to fig. 8, the overall thickness of the abutting portion 14 is greater than that of the chassis 11, an end surface away from the end surface provided with the limiting block 12 is higher than that of the chassis 11, and a height difference H exists between the two, and the height difference H is between 1 and 2mm.
Referring to fig. 11, the rotating cam 3 is substantially cylindrical and includes a connecting portion 31 and a cam portion 32, wherein the connecting portion 31 is configured to be coupled to the brake wrench 5, the cam portion 32 is configured to transmit power, and a step surface 33 is formed at a joint of the connecting portion 31 and the cam portion. The connecting portion 31 includes a plurality of first protrusions 311 uniformly distributed on the outer circumferential wall of the rotating cam 3 and a first limiting groove 312 formed between the two first protrusions 311; the cam portion 32 includes cams 321 which are equally distributed on the outer circumferential wall of the rotating cam 3 and a detent release groove 322 which is formed between the cams 321, wherein the first cam 321 and the cam 321 are disposed at positions where they are disposed, and the first stopper groove 312 and the detent release groove 322 are penetrated.
The brake wrench 5 includes a connection disc 51 and a rotating frame 52, the connection disc 51 is provided with a mounting hole 511 for the rotating cam 3 to pass through, the inner wall of the mounting hole 511 is uniformly distributed with second bumps 512 having the same number as the first bumps 311, a second limiting groove 513 is formed between two adjacent second bumps 512, the connecting portion 31 of the rotating cam 3 is accommodated in the mounting hole 511 during installation, the lower end face of the brake wrench 5 is abutted against the step face 33, meanwhile, the plurality of second bumps 512 in the mounting hole 511 and the second limiting grooves 513 are engaged in the first bumps 311 and the first limiting grooves 312 on the connecting portion 31 in a staggered manner, and the rotation of the brake wrench 5 can drive the rotating cam 3 to rotate at the same time.
A line pressing screw 522 and a lock nut 523 in threaded connection with the line pressing screw 522 are arranged at the end of the rotating frame 52, and a fixing hole 521 is arranged at the connecting end of the rotating frame 52 and the connecting disc 51.
Referring to fig. 9 and 10, all the brake shoes 2 are enclosed to form a circular ring, a fifth limiting groove 21 is formed in the outer wall of each brake shoe 2, and the plurality of brake shoes 2 always have an inward contraction movement trend through the reset pieces 6 embedded in the fifth limiting grooves 21.
This piece 6 that resets chooses for use the extension spring that both ends have a head hook 61 and a tail hook 62 respectively, closes through the hook of each other between them and encloses into a ring, and the extension spring can change different rigidity according to different motorcycle types. The groove bottom of the fifth limiting groove 21 on each brake shoe 2 is arc-shaped, when the tension spring is clamped in the fifth limiting groove 21, the groove bottom is matched with the groove bottom, and in addition, the groove depth of the fifth limiting groove 21 is larger than or equal to the diameter of the tension spring, so that the tension spring cannot be separated from the fifth limiting groove 21 after being clamped.
The inner arc surface of the brake shoe 2 is further provided with two arc-shaped limiting blocks 22 which are spaced at a certain angle, a through sixth limiting groove 23 is formed in the axial direction of each arc-shaped limiting block 22, and the left side and the right side of each sixth limiting groove 23 form a guide surface 24 through chamfers.
Referring to fig. 1, the opening end of the brake groove 731 is closed by an outer cover 8 and the brake device is fixed, one end of the hub axle 10 passes through the head of the outer cover 8 and is primarily pressed by an outer cover fixing sleeve 10f, a dust cap 9 is further provided at one side of the outer cover 8, and similarly, one end of the hub axle 10 passes through the dust cap 9, and the dust cap 9 is fixed by two fastening nuts 10b while fixing the outer cover 8.
Referring to fig. 6 and 12, the outer cover plate 8 is provided with a fixing groove 84, the fixing groove 84 is for the fixing pin 17 to pass through, and the outer cover plate 8 is further provided with a third limiting groove 85, the third limiting groove 85 enables the rotating frame 52 to pass through and limits the rotation angle of the rotating frame 52. The dust cover 9 has a protruding portion 91, the protruding portion 91 and the outer cover plate 8 cooperate to form a fourth limiting groove 92, and the fourth limiting groove 92 allows the rotating frame 52 to pass through and further limits the rotation angle of the rotating frame 52.
Referring to fig. 13, the outer cover plate 8 is further protruded toward one side of the framework 1 by a protruding pressure to form three evenly distributed limiting pressing blocks 86, and the limiting pressing blocks 86 are respectively abutted against the limiting blocks 12 of the framework 1 to limit the radial movement of the framework 1.
Referring to fig. 11, 12 and 14, a fixing spring 87 is further disposed on the fixing pin 17, one end of the fixing spring 87 is wound around the fixing pin 17, and the other end is hooked on the fixing groove 84, so that the frame 1 and the outer cover plate 8 are fixed. The hub axle 10 is further provided with a torsion spring 88, one end of the torsion spring 88 is hooked in the third limiting groove 85, and the other end is inserted into the fixing hole 521 of the rotating frame 52, so that the rotating frame 52 always tends to move toward the side of brake release.
Referring to fig. 1 and 5, bearing limiting grooves 76 are respectively formed in shaft holes of the faceplate 71 and the brake drum 73, a first bearing 101 and a second bearing 102 are respectively installed in each bearing limiting groove 76, the hub shaft 10 sequentially penetrates through the two bearings, a second gasket is abutted to the end face of the first bearing 101, the first bearing 101 is limited by the two fastening nuts 10b, and a sleeve 10d is further arranged between the two fastening nuts 10b to adjust the relative distance between the two fastening nuts 10 b.
Referring to fig. 1 to 3, the entire assembly is fixed to a frame 400 through flange nuts 10a at both ends of a hub axle 10, and the fixing reliability is improved by using a first washer abutting against the frame 400, the outer cover plate 8 has a brake bracket 81, one end of the brake bracket 81 is provided with a clamp 82, the clamp 82 is fastened to the chain stay 200, so that the entire assembly is fixed more firmly, and a cable-passing screw 83 is further inserted into the brake bracket 81, and a brake cable 300 can pass through the cable-passing screw 83 and be connected to the rotating bracket 52.
Referring to fig. 9, 11 and 15, a portion of the connection plate 51 of the brake wrench 5 is covered at the upper end surface of the roller 4 such that the roller 4 is axially restrained. Meanwhile, in the normal running process, the outer wall of the roller 4 is limited in the sixth limiting groove 23 and the braking release groove 322, so that the roller 4 is limited in the circumferential direction, and a distance exists between the plurality of brake shoes 2 and the inner wall of the iron ring 75.
With reference to fig. 16 and 17, during braking, when the brake handle is manually pulled, the brake cable 300 is pulled, the brake cable 300 drives the brake wrench 5 to rotate, the brake wrench 5 drives the rotating cam 3 to rotate when rotating, when the rotating cam 3 rotates by a certain angle, the plurality of cams 321 extrude the rollers 4 at corresponding positions, so that the rollers 4 gradually expand and simultaneously push the plurality of brake shoes 2 to expand, the rotating cam 3 continuously rotates, the radial sliding distance of the plurality of rollers 4 in the adjusting groove 13 is continuously increased, the expanding amplitude of the brake shoes 2 is gradually increased, and braking is performed when the brake shoes 2 abut against the inner side wall of the iron ring 75 in the rotating process until the hub 7 stops rotating to complete the braking process; when the brake handle is loosened, the brake wrench 5 is reset under the action of the torsion spring 88, the rotating cam 3 rotates, the brake shoes 2 contract inwards under the action of the torsion spring to reset and push the rollers 4 to reset, and the rollers 4 are finally limited in the brake release grooves 322.
Example two
Referring to fig. 18, different from the fixing manner of the outer cover plate 8 and the frame 400 of the first embodiment, the frame 400 is provided with a fixing seat 410 through a fastener, one end of the fixing seat 410 is provided with a limiting socket 411, and the brake frame 81 on the outer cover plate 8 can be inserted into the limiting socket 411 to achieve circumferential rotation limiting of the outer cover plate 8.
EXAMPLE III
Referring to fig. 19, the whole expansion brake drum assembly further includes a multistage flywheel 500, the middle of the multistage flywheel 500 is provided with an internal flywheel thread 510, the end of the disc chuck 71 is provided with an external disc chuck thread 711, and the multistage flywheel 500 is fixed by a thread connection when being fixed with the drum 7.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (6)
1. The utility model provides a bicycle expansion brake flower-drum assembly which characterized in that includes:
the hub (7) is integrally formed by a hub (71), a middle connecting pipe (72) and a brake drum (73);
the brake shoes (2) are accommodated and uniformly distributed in the brake drum (73) and can move to abut against the brake drum (73), the outer wall of each brake shoe (2) is provided with a fifth limiting groove (21), and a first bearing (101) and a second bearing (102) are respectively installed in the faceplate (71) and the brake drum (73);
the hub assembly comprises a hub shaft (10), a first bearing (101) and a second bearing (102), wherein the hub shaft (10) penetrates through the hub (7) and can rotate relative to the hub (7), the assembly is fixed on a frame (400) through fasteners at two ends of the hub shaft (10), and the hub shaft (10) is respectively arranged in the first bearing (101) and the second bearing (102) in a penetrating manner;
the linkage mechanism is also accommodated in the brake drum (73) and can act on the brake shoes (2) to enable the brake shoes to be away from the radial distance of the axis of the hub shaft (10), the linkage mechanism comprises a framework (1), a plurality of rollers (4) uniformly distributed on the framework (1), a rotating cam (3) and a brake wrench (5), the rotating cam (3) can control the rollers (4) to be away from the axis of the hub shaft (10) to be subjected to radial displacement, the rollers (4) are always abutted to the inner sides of the brake shoes (2), the brake wrench (5) is connected with the rotating cam (3), and the brake shoes (2) are abutted to the brake drum (73) when a braking force is applied to the brake wrench (5); the wheel hub comprises a framework (1) and a plurality of limiting blocks (12) which are arranged on one side end face of the framework (11) and are uniformly distributed in the circumferential direction, wherein an adjusting groove (13) for accommodating a roller (4) is formed between every two adjacent limiting blocks (12), a first noise reduction groove (19) is formed in one end face deviating from the limiting blocks (12), a through hole is formed in the middle of the framework (11), an abutting part (14) is arranged in the through hole, a rotating cam (3) is arranged on the abutting part (14), and a positioning hole (141) for the wheel hub shaft (10) to penetrate through is formed in the middle of the abutting part (14);
the outer cover plate (8) covers one side of the brake drum (73) and is used for limiting the brake shoe (2) and the linkage mechanism in the brake drum (73);
reset piece (6), make a plurality of brake shoes (2) have the synchronous motion trend that draws in to wheel hub axle (10) axis direction all the time, reset piece (6) for end to end hook mutually and be annular extension spring, the extension spring block is in fifth spacing groove (21) of a plurality of brake shoes (2).
2. The expanding brake drum assembly for the bicycle according to claim 1, wherein the abutting portion (14) is connected with the chassis (11) through a plurality of circumferentially uniformly distributed connecting blocks (15), and a second noise reduction groove (16) is formed between every two adjacent connecting blocks (15); connecting block (15) are corresponding to the position of stopper (12), and one end is connected with stopper (12), and the other end links to each other with butt portion (14), and wherein deviates from a terminal surface setting for arcwall face (18) in stopper (12).
3. The bicycle expanding brake drum assembly according to claim 1, wherein the rotating cam (3) comprises a connecting portion (31) and a cam portion (32) which are distributed vertically, the connecting portion (31) comprises first protruding blocks (311) which are circumferentially and uniformly distributed on an outer wall, a first limiting groove (312) is formed between every two adjacent first protruding blocks (311), the brake wrench (5) comprises a connecting disc (51) and a rotating frame (52), the connecting disc (51) is provided with a mounting hole (511) for accommodating the connecting portion (31), and second protruding blocks (512) and second limiting grooves (513) which are staggered and clamped with the first protruding blocks (311) and the first limiting grooves (312) are circumferentially and uniformly distributed on an inner wall of the mounting hole (511).
4. The bicycle expansion brake drum assembly according to claim 3, wherein a step surface (33) is provided between the connecting portion (31) and the cam portion (32), the connecting plate (51) abuts against the step surface (33) and partially covers the upper end surfaces of the plurality of rollers (4), and the cam portion (32) comprises cams (321) circumferentially and uniformly distributed on the outer wall of the rotating cam (3) and brake release grooves (322) formed between two adjacent cams (321).
5. The bicycle expanding brake hub assembly according to claim 3, wherein the outer cover plate (8) is further provided with a third limiting groove (85) for the rotating frame (52) to rotate, and the brake wrench (5) is further provided with a torsion spring (88) which always tends to move towards one side of the braking force; still be fixed with shield (9) on outer apron (8), shield (9) have bellying (91), bellying (91) and outer apron (8) are constituteed and are formed fourth spacing groove (92) that supply rotating turret (52) part to wear out and spacing rotating turret (52) rotation angle.
6. The bicycle expansion brake hub assembly according to claim 1, wherein a brake groove (731) is formed in one end of the brake drum (73), a limit ring (732) is disposed in the brake groove (731), an iron ring (75) is further disposed in the brake groove (731), the linkage mechanism is housed in the iron ring (75), the iron ring (75) includes a limit disc (751) abutting against the bottom of the brake groove (731), the limit disc (751) is provided with a relief groove (752) for housing the limit ring (732), the inner wall of the brake groove (731) is provided with a first anti-slip pattern (733), and the outer wall of the iron ring (75) is provided with a second anti-slip pattern (753) abutting against the first anti-slip pattern (733).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710152677.0A CN107839825B (en) | 2017-03-15 | 2017-03-15 | Bicycle expansion brake hub assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710152677.0A CN107839825B (en) | 2017-03-15 | 2017-03-15 | Bicycle expansion brake hub assembly |
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| Publication Number | Publication Date |
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| CN107839825A CN107839825A (en) | 2018-03-27 |
| CN107839825B true CN107839825B (en) | 2023-04-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710152677.0A Active CN107839825B (en) | 2017-03-15 | 2017-03-15 | Bicycle expansion brake hub assembly |
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| CN (1) | CN107839825B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108679202A (en) * | 2018-06-20 | 2018-10-19 | 唐泽制动器(天津)有限公司 | A kind of speed changer brake disc assembly |
| CN111605521B (en) * | 2019-02-23 | 2022-09-20 | 河南卓安伟业智能科技有限公司 | Automobile active anti-collision auxiliary brake device |
| CN114524047A (en) * | 2022-03-07 | 2022-05-24 | 唐泽交通器材(泰州)有限公司 | Clutch type expansion brake for bicycle |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2702350B2 (en) * | 1992-03-23 | 1998-01-21 | 株式会社シマノ | Bicycle braking device |
| JP3638309B2 (en) * | 1994-06-23 | 2005-04-13 | 株式会社シマノ | Bicycle hub brake |
| JPH0960664A (en) * | 1995-08-28 | 1997-03-04 | Takatsugu Nakano | Vehicular brake |
| CN100534855C (en) * | 2005-06-17 | 2009-09-02 | 株式会社岛野 | Wheel drive device for bicycle |
| TWM327327U (en) * | 2007-09-05 | 2008-02-21 | Qun-Xiang Ceng | Improved brake block structure |
| CN201511758U (en) * | 2009-09-09 | 2010-06-23 | 久钰车料(昆山)有限公司 | Hub and special mold for manufacturing the same |
| CN206615327U (en) * | 2017-03-15 | 2017-11-07 | 慈溪市凯质车业有限公司 | Bicycle expansion brake hub assembly |
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