Clutch type expansion brake for bicycles

Abstract

The application discloses a clutch type expansion brake for a bicycle, which comprises a shell, a push rod, a clutch driving device, a support body, a sliding block and a tightening ring. The support body is provided with an annular base, and the annular base is provided with positioning protrusions on one side. The sliding block is adapted to be arranged in the mounting portion between the two adjacent positioning protrusions. The positioning protrusions and the outer side surface of the sliding block are provided with annular grooves for mounting the tightening ring. The clutch driving device is embedded in the inner cavity formed by the positioning protrusions and the sliding block. The push rod drives the clutch driving device to rotate in the inner cavity of the support body. The rolling cylinder rolls along the inclined wedge-shaped slope surface structure on the inner side surface of the sliding block, pushes out the sliding block, and is recycled under the action of the tightening ring, so that the disengagement and engagement with the hub brake are completed. The application solves the problem that the existing brake cannot balance the braking effect and braking stability due to the gap size of the roller in the support mounting groove.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of brake devices, in particular to a clutch type expansion brake for bicycles. BACKGROUND

[0002] In the prior art, the expansion brake for bicycles or electric bicycles is generally structured by installing a friction material shoe block assembly on a cam shaft, and a push rod drives the cam shaft to continuously reciprocate, thereby expanding one end of the brake shoe block assembly to make the brake shoe block rub against the brake hub to achieve the braking effect. During the braking process, the end close to the pivot shaft is difficult to contact the brake hub, and only the end connected with the cam shaft contacts the brake hub, so the effective friction braking area is small, and the pivot shaft end is usually scrapped without wear. In addition, since the whole shoe block does not contact and brake by friction, the friction braking force is not uniform, which easily causes problems such as jamming and locking.

[0003] At the same time, people have continuously improved the braking performance of bicycles, such as the bicycle expansion brake of CN2341880, which is composed of a brake drum, a shell, a friction plate, a shaft sleeve, a ratchet, a connecting rod, a ball, a ball holder, and a positioning plate. For example, CN207644554U is a bicycle expansion brake, and the brake assembly includes a roller skeleton, the inner cavity of the roller skeleton is embedded with an outer hexagonal expansion block, and the outer side of the roller skeleton is tensioned with a brake tile by a spring ring. As described above, the braking effect is achieved by setting a ratchet or expansion block pushing device at the center position inside the expansion brake to push the rollers set in the bracket to expand the brake pad outward. The braking stroke of the brake completely depends on the gap size of the rollers in the bracket mounting groove. If the gap is small, the ratchet or expansion block pushing device cannot push the rollers out, and the braking effect is not obvious. If the gap is large, the rollers are easy to loosen and fall off, the transmission is unstable, the braking force is not uniform, the stability is not good, and the overall service life is not long. SUMMARY

[0004] In view of the deficiencies of the prior art, the present application provides a clutch type expansion brake for bicycles, which solves the problem that the braking effect and braking stability cannot be balanced due to the gap size of the rollers in the bracket mounting groove.

[0005] In order to achieve the above purpose, the present application is realized by the following technical scheme:

[0006] The application is a bicycle clutch type expansion brake, comprising a shell, a push rod, a clutch drive device, a support body, a sliding block and a tightening ring; the support body is provided with an annular base, one side of the annular base is provided with a positioning protrusion, the cross section of the positioning protrusion is a concentric ring surface sector structure, the sliding block is adapted to be arranged in the mounting portion between the adjacent two positioning protrusions, the positioning protrusion and the outer side surface of the sliding block are provided with an annular groove for mounting the tightening ring, the clutch drive device is embedded in the inner cavity formed by the positioning protrusion and the sliding block; the clutch drive device is composed of a driving disc and a cylindrical roller, the end surface of the driving disc is provided with a central axis hole and a clamping groove, the outer side surface of the driving disc is provided with an arc-shaped groove for embedding the cylindrical roller, the cylindrical roller is in rolling contact with the inner side surface of the sliding block, the inner side surface of the sliding block is provided as an inclined wedge-shaped slope structure perpendicular to the annular base; one end of the push rod is provided with a brake cable connecting portion, the inner end of the push rod is provided with a flange structure, the flange structure is provided with a cover arranged on the end surface of the clutch drive device and shielding the cylindrical roller, the flange structure is provided with a central through hole and a clamping tooth structure matched with the clamping groove, the push rod drives the clutch drive device to rotate in the inner cavity of the support body, the cylindrical roller rolls along the inclined wedge-shaped slope structure and pushes out the sliding block, and the sliding block is recovered under the action of the tightening ring, thereby completing the disconnection and connection of the brake with the hub.

[0007] Further improvement lies in that 3-6 positioning protrusions are arranged on the annular base, the outer side surfaces of the positioning protrusions and the sliding block are provided as arc surfaces matched with the outer side cylindrical surface of the annular base, and the inner and outer side surfaces of the positioning protrusions are provided as concentric arc surface structures.

[0008] Further improvement lies in that the positioning protrusions are arranged in two structures with different heights and are distributed on the annular base in an interval manner, and the top end surface of the positioning protrusion is further provided with a threaded hole or a columnar protrusion.

[0009] Further improvement lies in that the driving disc is a disc-shaped structure or a polygon structure with central symmetry, the end surface of the driving disc is uniformly provided with 2-5 central symmetric clamping grooves, the clamping grooves are provided as concentric arc long hole structures, and the arc-shaped grooves are provided with 3-6 uniformly symmetric structures on the outer side surface of the driving disc.

[0010] Further improvement lies in that the flange structure is provided as a disc-shaped or petal-shaped structure distributed in a symmetrical manner; the outer side edges of the disc-shaped or petal-shaped structure are provided with 2-5 inward clamping tooth structures in an interval manner.

[0011] Further improvement lies in that the outer side surface of the sliding block is further provided with a friction material, and the inclined wedge-shaped slope structure divides the two end surfaces of the sliding block into a long edge end surface and a short edge end surface.

[0012] Further improvement lies in that the shell is provided with a central axis through hole, a brake cable fixing lug, a frame limiting groove, a push rod hole and a fixing hole, the shell is sleeved on the push rod and is detachably connected with the support body through the fixing hole.

[0013] Further improvement lies in that the push rod is further provided with a reset spring, one end of the reset spring is connected with the push rod, and the other end is connected with the cylindrical protrusion, so that the slider is separated from the wheel hub and is expanded together with the tightening ring.

[0014] Further improvement lies in that the tightening ring is a circular reset spring, and the push rod brake wire connecting part is provided with the reset spring between the brake wire fixing lug.

[0015] The beneficial effects of the present application are:

[0016] The plurality of arc-shaped grooves are arranged on the outer circumferential side of the driving disc, the cylindrical rollers are embedded in the arc-shaped grooves, the cylindrical rollers are clamped between the inclined wedge-shaped slope structure on the inner side of the slider and the arc-shaped grooves, the slider is installed in the space between the adjacent two positioning lugs of the support body, and the flange structure is arranged on the push rod to shield the flange structure, so that the structure is compact, the braking is synchronous and uniform and stable.

[0017] The cross section of the positioning lug is a concentric ring surface sector structure, the opening and closing action of the slider is not limited by the support mounting part, the braking is smoother, the friction braking is more sufficient, the synchronous stability is better, and the service life is prolonged.

[0018] The force increasing system of the push rod and the driving disc exerts a large pressure on the slider, the pressure directly acts on the brake hub in the radial direction, the braking effect is good, the cylindrical roller is used as a force transmission element, the friction resistance is small, the layered braking makes the brake block wear uniformly, the hand feeling is light, and the locking phenomenon in the emergency braking process is effectively improved.

[0019] The driving disc is in a disc shape or a polygon structure which is centrally symmetrical, the structure is simple, the coaxiality is good, and the assembly is convenient and efficient; the push rod is provided with the toothed structure which is directly connected with the clamping groove on the driving disc, the manufacturing is convenient, the universality is good, and the push rod is suitable for mass production. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a schematic diagram of a bicycle clutch type expansion brake three-dimensional structure.

[0021] Figure 2 It is an exploded schematic diagram of a bicycle clutch type expansion brake.

[0022] Figure 3 It is an assembly schematic diagram of the support body and the clutch driving device.

[0023] Figure 4 It is a front view of the assembly of the support body and the clutch driving device.

[0024] Figure 5 It is a schematic diagram of the support body structure.

[0025] Figure 6 It is a schematic diagram of the driving disc structure.

[0026] Figure 7 is another structure diagram of the driving disc.

[0027] Figure 8 is a structure diagram of the push rod.

[0028] Figure 9 is another structure diagram of the push rod.

[0029] Figure 10 is a structure diagram of the shell.

[0030] Fig. 1 is a structure diagram of the shell; Fig. 2 is a structure diagram of the middle shaft through hole; Fig. 3 is a structure diagram of the brake wire fixing lug; Fig. 4 is a structure diagram of the frame limiting groove; Fig. 5 is a structure diagram of the push rod hole; Fig. 6 is a structure diagram of the fixing hole; Fig. 7 is a structure diagram of the push rod; Fig. 8 is a structure diagram of the brake wire connecting part; Fig. 9 is a structure diagram of the flange structure; Fig. 10 is a structure diagram of the center through hole; Fig. 11 is a structure diagram of the clamping tooth structure; Fig. 12 is a structure diagram of the clutch driving device; Fig. 13 is a structure diagram of the driving disc; Fig. 14 is a structure diagram of the cylindrical roller; Fig. 15 is a structure diagram of the middle shaft hole; Fig. 16 is a structure diagram of the clamping groove; Fig. 17 is a structure diagram of the arc-shaped recess; Fig. 18 is a structure diagram of the support body; Fig. 19 is a structure diagram of the annular base; Fig. 20 is a structure diagram of the positioning protruding block; Fig. 21 is a structure diagram of the threaded hole; Fig. 22 is a structure diagram of the columnar protrusion; Fig. 23 is a structure diagram of the mounting part; Fig. 24 is a structure diagram of the sliding block; Fig. 25 is a structure diagram of the inclined wedge-shaped slope surface structure; Fig. 26 is a structure diagram of the long side end face; Fig. 27 is a structure diagram of the short side end face; Fig. 28 is a structure diagram of the tightening ring; and Fig. 29 is a structure diagram of the annular recess. DETAILED DESCRIPTION

[0031] In order to deepen the understanding of the present application, the present application will be further described in detail below in conjunction with the drawings. The embodiments are only used to explain the present application and do not constitute a limitation on the protection scope of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work belong to the protection scope of the present application.

[0032] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the combination or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0033] The present application will be further described in detail below in conjunction with the drawings and embodiments.

[0034] As Figures 1-4An embodiment of the present application is given: a bicycle clutch type brake, comprising a shell 10, a push rod 20, a clutch drive device 30, a bracket body 40, a sliding block 50 and a tightening ring 60; the bracket body 40 is provided with an annular base 41, one side of the annular base 41 is provided with a positioning lug 42, the cross section of the positioning lug 42 is a concentric ring surface sector structure, the sliding block 50 is adapted to be arranged in the mounting portion 45 between the adjacent two positioning lugs 42, the outer side surface of the positioning lug 42 and the sliding block 50 is provided with an annular groove 61 for mounting the tightening ring 60, the clutch drive device 30 is embedded in the inner cavity formed by the positioning lug 42 and the sliding block 50; the clutch drive device 30 is composed of a driving disc 31 and a cylindrical roller 32, the end surface of the driving disc 31 is provided with a central axis hole 311 and a clamping groove 312, the outer side surface of the driving disc 31 is provided with an arc-shaped groove 313 for embedding the cylindrical roller 32, the cylindrical roller 32 is in rolling contact with the inner side surface of the sliding block 50, the inner side surface of the sliding block 50 is provided as a inclined wedge-shaped slope surface structure 51 perpendicular to the annular base 41; one end of the push rod 20 is provided with a brake cable connecting portion 21, the inner end of the push rod 20 is provided with a flange structure 22, the flange structure 22 is provided with a cover on the end surface of the clutch drive device 30 and covers the cylindrical roller 32, the flange structure 22 is provided with a central through hole 23 and a clamping tooth structure 24 matched with the clamping groove 312, the push rod 20 drives the clutch drive device 30 to rotate in the inner cavity of the bracket body 40, the cylindrical roller 32 rolls along the inclined wedge-shaped slope surface structure 51 of the inner side surface of the sliding block 50 and pushes out the sliding block 50, and the sliding block 50 is recovered under the action of the tightening ring 60, and the disengagement and engagement with the hub brake is completed.

[0035] As the above structure, the other end of the push rod is provided with a clamping tooth structure directly clamped and connected with the clamping groove on the driving disc, the structure is simple, the assembly is convenient and efficient, and the coaxiality is good; the cylindrical roller is embedded in the arc-shaped grooves arranged on the outer peripheral side surface of the driving disc, the cylindrical roller is clamped between the inclined wedge-shaped slope surface structure on the inner side of the sliding block and the arc-shaped groove, the sliding block is installed in the space between the two adjacent positioning lugs of the bracket body, and the flange structure on the push rod covers it, the structure is compact, the brake is synchronous and uniform and stable; the cross section of the positioning lug is a concentric ring surface sector structure, the disengagement and engagement action of the sliding block is not limited by the bracket mounting portion, the brake stroke is controllable and adjustable, the sliding block can be replaced after the outer side surface is fully rubbed and worn by the brake hub, and the service life is prolonged.

[0036] As Figure 5As shown: the annular base 41 is provided with 3-6 positioning blocks 42, the positioning block 42 and the outer side of the slider 50 are provided with arc-shaped surface and the outer side column surface of the annular base 41 is matched, the inner and outer side surfaces of the positioning block 42 are provided as concentric arc surface structure; the cross section of the positioning block 42 is concentric ring surface sector structure, the both sides of the positioning block 42 are center radial plane, the similar inner side surface of the slider 50 installed in the slider installation part 45 between the adjacent two blocks 42 is small, and the outer side surface is large structure, so the opening and closing action of the slider is more smooth, the friction braking is more sufficient, and the synchronization stability is better.

[0037] More preferably: the positioning block 42 is provided with two structures with different heights and low structures spaced apart on the annular base 41, and the positioning block 42 is further provided with a threaded hole 43 or a columnar protrusion 44 on the top surface. In this way, it is convenient to install and fix, and the overall structure is more firm and reliable.

[0038] As shown in Figure 6 , 7 : the driving disc 31 is a disc-shaped structure or a center-symmetric polygonal structure, and 2-5 center-symmetric clamping grooves 312 are uniformly arranged on the end surface, the clamping groove 312 is provided as a concentric arc long hole structure, and the arc-shaped groove 313 is provided with 3-6 uniformly and symmetrically arranged on the outer side surface of the driving disc 31; the driving disc 31 is a center-symmetric polygonal structure, the clamping groove 312 is arranged at the center position of each side, and the top angle of the joint of adjacent sides is rounded; of course, the clamping groove 312 can also be arranged at the top angle position of the adjacent side; in this way, the structure is simple, the manufacturing is convenient, the universality is good, and it is suitable for mass production. As shown in Figure 7 More preferably, the central axis hole 311 of the driving disc 31 can be provided as a larger size hole, or an internal hollow shell structure, which can reduce the weight of the whole brake.

[0039] As shown in Figure 8 , 9 : the flange structure 22 is provided as a symmetrically distributed disc-shaped or petal-shaped structure; the outer side edges of the disc-shaped or petal-shaped structure are provided with 2-5 inward clamping tooth structures 24; as shown in Figure 9 : the central through hole 23 can be provided as a one-side or two-side outward flange structure, which is beautiful in structure, convenient and reliable in installation position.

[0040] As shown in Figure 4As shown: the outer side of the slider 50 is also provided with friction material, the inclined wedge slope structure 51 divides the two end faces of the slider 50 into long edge end face 52 and short edge end face 53; when the cylindrical roller 32 rotates to the vicinity of the long edge end face 52, the slider 50 is opened and ejected from the contact braking with the wheel hub, and when the cylindrical roller 32 rotates to the vicinity of the short edge end face 53, the slider 50 resets and recovers, the braking is released, and the service life of the whole brake is prolonged.

[0041] As shown in the figure: Figure 10 As shown: the shell 10 is provided with a central shaft through hole 11, a brake line fixing lug 12, a frame limiting groove 13, a push rod hole 14 and a fixing hole 15, the shell 10 is sleeved on the push rod 20 and is detachably connected with the support body 40 through the fixing hole 15. With such structure, the whole is more firm, the applicability is wider, different shells can be matched according to the needs, it can be used for different vehicle models, and has dustproof effect.

[0042] More preferably: the push rod 20 is also provided with a reset spring, one end of the reset spring is connected with the push rod 20, and the other end is connected with the cylindrical protrusion 44, which cooperates with the tightening ring 60 to separate and expand the slider 50 from the wheel hub. Resetting is more reliable and powerful.

[0043] More preferably: the tightening ring 60 is a circular reset spring, and the push rod 20 brake line connecting part is provided with a reset spring between the brake line fixing lug 12.

[0044] Example two: the inner side of the slider 50 can also be provided as a straight plane structure, the two side end faces 52, 53 are concentric and have the same size, the cylindrical roller 32 is turned to the two ends, the slider 50 is in a closed reset state, and the cylindrical roller 32 is turned to the middle of the side, the slider 50 is opened to the maximum. In order to obtain longer service life, the number of positioning lugs on the support body 40 is reduced, such as 3, and the outer diameter of the driving disc is reduced; other structures are the same as example one.

[0045] The operation principle of the application is as follows:

[0046] When the vehicle brakes, the brake handle is pinched, the push rod 20 is pulled by the brake line, the flange structure 22 of the push rod 20 covers the driving mechanism 30, drives the driving disc 31 and the cylindrical roller 32 to rotate together along the inclined wedge slope structure 51 of the inner side of the slider 50, and when the cylindrical roller 32 rotates to the vicinity of the short edge end face 53, the slider 50 is in a reset recovery state under the action of the tightening ring 60; the cylindrical roller 32 rotates to the long edge end face 52 along the inclined wedge slope structure 51 of the driving disc 31, all the sliders 50 are opened and ejected together relative to the positioning lugs 42, and are in contact with the wheel hub.

[0047] Of course, the present application can be improved in the main body material and size according to requirements, and can also be applied to electric vehicles or motorcycles, and when the main body material is selected as reinforced plastic material, can also be applied to children's bicycles.

[0048] The embodiments of the present application disclose the preferred embodiments, but are not limited thereto, and the ordinary skilled in the art can easily understand the spirit of the present application according to the above embodiments, and make different inferences and changes, as long as they do not deviate from the spirit of the present application, they are within the protection scope of the present application.

Claims

1. A clutch-type expansion gate for a bicycle, characterized by: It includes a shell (10), a push rod (20), a clutch driving device (30), a support body (40), a sliding block (50) and a tightening ring (60); The support body (40) is provided with an annular base (41), one side of the annular base (41) is provided with a positioning lug (42), the cross section of the positioning lug (42) is a concentric ring surface sector structure, the sliding block (50) is adapted to be arranged in the mounting portion (45) between the two adjacent positioning lugs (42), the outer side surfaces of the positioning lugs (42) and the sliding block (50) are provided with annular grooves (61) for mounting the tightening ring (60), and the clutch driving device (30) is embedded in the inner cavity formed by the positioning lugs (42) and the sliding block (50). The clutch driving device (30) is composed of a driving disc (31) and a cylindrical roller (32), the end surface of the driving disc (31) is provided with a central axis hole (311) and a clamping groove (312), the outer side surface of the driving disc (31) is provided with an arc-shaped groove (313) for embedding the cylindrical roller (32), the cylindrical roller (32) is in rolling contact with the inner side surface of the sliding block (50), and the inner side surface of the sliding block (50) is provided as a inclined wedge-shaped slope surface structure (51) perpendicular to the annular base (41). The push rod (20) is provided with a brake wire connecting portion (21) at one end, the inner end of the push rod (20) is provided with a flange structure (22), the flange structure (22) is provided with a central through hole (23) and a clamping tooth structure (24) adapted to the clamping groove (312), the flange structure (22) is covered on the end surface of the clutch driving device (30) and blocks the cylindrical roller (32), the push rod (20) drives the clutch driving device (30) to rotate in the inner cavity of the support body (40), the cylindrical roller (32) rolls along the inclined wedge-shaped slope surface structure (51) and pushes out the sliding block (50), and the sliding block (50) is recovered under the action of the tightening ring (60), so that the wheel hub is separated from the brake. The annular base (41) is provided with 3-6 positioning lugs (42), the outer side surfaces of the positioning lugs (42) and the sliding block (50) are provided as arc surfaces matched with the outer side cylindrical surface of the annular base (41), and the inner and outer side surfaces of the positioning lugs (42) are provided as concentric arc surface structures. The positioning lugs (42) are provided with two structures with different heights and are distributed on the annular base (41) at intervals, and the top end surfaces of the positioning lugs (42) are further provided with threaded holes (43) or columnar protrusions (44). The driving disc (31) is a disc-shaped structure or a polygon structure with central symmetry, and 2-5 central symmetric clamping grooves (312) are uniformly arranged on the end surface of the driving disc (31), the clamping grooves (312) are provided as concentric arc long hole structures, and the arc-shaped grooves (313) are provided with 3-6 uniformly symmetric structures on the outer side surface of the driving disc (31).

2. The clutch type expansion gate for a bicycle according to claim 1, wherein: The flange structure (22) is provided as a disc-shaped or petal-shaped structure symmetrically distributed; 2-5 inward clamping tooth structures (24) are arranged at intervals on the outer side edges of the disc-shaped or petal-shaped structure.

3. The clutch type expansion gate for bicycle according to any one of claims 1-2, characterized in that: The slider (50) outer side is further provided with friction material, the inclined wedge shaped slope structure (51) divides two end faces of the slider (50) into long side end face (52) and short side end face (53).

4. The clutching expansion gate for a bicycle according to claim 3, wherein: The shell (10) is provided with a central shaft through hole (11), a brake cable fixing lug (12), a frame limiting groove (13), a push rod hole (14) and a fixing hole (15), the shell (10) is sleeved on the push rod (20) and is detachably connected with the support body (40) through the fixing hole (15).

5. The clutching expansion gate for a bicycle according to claim 4, wherein: The push rod (20) is further provided with a reset spring, one end of the reset spring is connected with the push rod (20), and the other end is connected with the cylindrical protrusion (44), which cooperates with the tightening ring (60) to separate the slider (50) from the hub and expand.

6. The clutching expansion gate for a bicycle according to claim 5, wherein: The tightening ring (60) is a circular reset spring, and a reset spring is arranged between the brake cable connecting portion of the push rod (20) and the brake cable fixing lug (12).

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