Rear hub structure of bicycle

Abstract

The utility model provides a rear hub structure of a bicycle, which comprises a hub provided with an accommodating space, and a plurality of ratchets annularly arranged on the inner wall of the accommodating space; the mandrel penetrates through the hub, the mandrel is sequentially provided with a first section, a second section and a third section, and a first bearing is arranged between the accommodating space and the second section; the positioning ring set comprises a first positioning ring, a second positioning ring and a third positioning ring, the first positioning ring and the second positioning ring are arranged on the second section in a sleeving mode, one end of the first positioning ring is connected with the second positioning ring in an abutting mode, the other end of the first positioning ring is connected with the first bearing in an abutting mode, and the third positioning ring is arranged on the third section in a sleeving mode; one end of the third positioning ring is propped against the second positioning ring; the ratchet wheel sleeve is provided with a pawl seat, a second bearing is arranged in the pawl seat, one end of the ratchet wheel sleeve is arranged in the containing space in a penetrating mode, the mandrel is arranged in the ratchet wheel sleeve in a penetrating mode, the second positioning ring is located between the pawl seat and the second section, and one end of the second bearing abuts against the third positioning ring; by means of the components, the positioning rings and the two bearings abut against each other and are matched to generate rotation, loose fit is formed in the radial direction, the concentricity difference among the hubs, the mandrel, the ratchet wheel sleeve and the bearings can be compensated, the hubs can rotate more smoothly, the components are simple, the production speed is high, cost is low, and excellent innovation, convenience and practicability are achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a bicycle rear hub structure, especially a positioning ring structure capable of improving concentricity, which can compensate for the difference in concentricity between each hub, mandrel, ratchet sleeve and bearing, so that the hub rotates more smoothly and has the effect of simple components. BACKGROUND

[0002] A hub structure is provided between the bicycle rear wheel and the freewheel, the hub body has a ratchet design, a mandrel is inserted into the hub body, a ratchet sleeve is sleeved on one side of the hub body, the periphery of the ratchet sleeve is provided with a plurality of ratchet blocks to cooperate with the ratchet teeth of the one-way clamping hub body to drive the hub body to rotate synchronously, thereby achieving the driving effect of providing driving force for the rotation of the rear wheel.

[0003] The existing bicycle hub structure, such as the "bicycle hub structure" disclosed in Taiwan Utility Model Patent No. 105214476, includes: a hollow hub with an opening on one side with an inner diameter larger than the inner diameter of the middle of the hub, a receiving groove is provided on the inner side of the opening and the other side of the hub, a plurality of limiting slot holes are provided radially around the bottom end of the inner side of the opening, a plurality of compression springs are provided in the limiting slot holes, an internal thread section is provided around the intersection of the inner side of the opening and the receiving groove, and a positioning ring is provided near the outer edge of the opening; a rod-shaped hub is provided through the center of the hub, external thread sections are provided at both ends of the hub, and a positioning ring is provided on one side and about the middle of the hub, when two bearings are respectively provided through the two ends of the hub, the positioning rings are positioned on the inner side of the hub and the receiving groove provided on the other side of the hub, and the external thread sections are locked with the internal thread section provided around the intersection of the inner side of the opening and the receiving groove; a hollow inner ring is provided with external thread sections around the outer periphery to be locked with the internal thread section provided around the intersection of the inner side of the opening and the receiving groove of the hub, and a plurality of internal teeth are provided around the inner periphery; a hollow outer ring is provided inside the inner ring at the opening end of the hub, a plurality of external teeth are provided around the outer periphery of the outer ring to cooperate with the internal teeth provided around the inner periphery of the inner ring, and a plurality of ratchet teeth are provided around the outer end surface of the outer ring; a positioning ring is provided on the hub at the opening end of the hub and outside the bearing provided at the inner side of the opening; a sleeve with two ends is provided through the opening end of the hub, which includes: a sleeve body, two bearings, and a positioning sleeve; wherein, an extension pipe body is provided at the inner end of the sleeve body, a ratchet ring is provided around the outer periphery of the extension pipe body, and ratchet teeth are provided on the outer end surface of the ratchet ring; the two bearings are provided at both ends of the internal sleeve body, and the bearing provided at the inner end of the internal sleeve body is provided in the opening end of the extension pipe body; the positioning sleeve separates the two bearings to maintain a proper distance; when the sleeve is provided through the hub at the opening end, the ratchet ring provided around the outer periphery of the extension pipe body of the sleeve body, the ratchet teeth provided on the outer end surface of the ratchet ring, cooperate with the elastic compression of the compression spring provided in the limiting slot hole at the inner side of the opening end of the hub, the ratchet teeth provided on the outer end surface of the outer ring cooperate with the ratchet teeth provided on the outer end surface of the ratchet ring, and the outer ring can be rotated in one direction; an oil seal is embedded in the positioning ring provided near the outer edge of the opening of the hub; two nuts cooperate with the external thread sections provided at both ends of the hub.

[0004] In the above-mentioned structure, after the hub is inserted from one side of the hub, the two bearings are respectively inserted from both ends of the hub, and are positioned by the positioning rings provided on one side and about the middle of the hub, so that the two bearings are respectively provided in the receiving groove provided on the inner side of the opening and the other side of the hub, and the hub is provided in the external thread section provided at the opening end of the hub and the nut to prevent the bearing on that side from coming out; then the outer ring, the positioning ring, and the sleeve are sequentially provided from the opening end of the hub, and finally the other nut is locked with the other external thread section on that side of the hub to form the hub structure.

[0005] However, in the existing flower drum structure, only a positioning ring is abutted between the two bearings. Since there are tolerances between the hub and the flower drum and between the ratchet sleeve and the bearing, the concentricity is different, which affects the smoothness of the rotation of the flower drum. Therefore, the overall structure needs to be improved. Content of the utility model

[0006] The utility model provides a bicycle rear flower drum structure, it includes: a flower drum, one end is recessed with a containing space, the containing space inner wall is equipped with a plurality of ratchet tooth; a spindle is worn in the flower drum, the outer periphery of the spindle is sequentially equipped with a first section, a second section and a third section, and each first section, second section, third section is stepped, one end of the first section away from the second section is connected in the flower drum, a first bearing is sleeved between the containing space and the second section; a positioning ring group, including a first positioning ring, a second positioning ring and a third positioning ring, the first positioning ring and the third positioning ring are annular, the second positioning ring is slightly sleeve shape and has a preset height, the first positioning ring and the second positioning ring are sleeved on the second section, one end of the first positioning ring and the second positioning ring abut each other, and the other end of the first positioning ring and the first bearing abut each other, and the third positioning ring is sleeved on the third section, one end of the third positioning ring and the second positioning ring abut each other; a ratchet sleeve, one end is provided with a freewheel group, the other end of the ratchet sleeve is provided with a pawl seat corresponding to the ratchet tooth, the pawl seat is annularly provided with a plurality of pawls, and a second bearing is sleeved in the pawl seat, one end of the ratchet sleeve is inserted into the containing space, so that each pawl and ratchet tooth are engaged, the spindle is inserted into the ratchet sleeve, the second section and the third section are inserted into the ratchet sleeve, one end of the third section away from the second section is connected with the ratchet sleeve, the second positioning ring is located between the pawl seat and the second section, and one end of the second bearing and the third positioning ring abut each other;Through the above-mentioned component, the plurality of positioning rings and the two bearings abut each other to rotate, and the radial clearance is formed, which can compensate the difference of the concentricity between the flower drum, the spindle, the ratchet sleeve and the bearing, so that the flower drum rotates more smoothly, the component is simple, the production speed is fast and the cost is low, and the utility model has excellent innovation and convenient practicality.

[0007] Further, the outer diameter of the second section of the spindle is greater than the outer diameter of the third section, a stop edge is formed between the first section and the second section, a step edge is formed between the second section and the third section, and one end of the first bearing abuts the stop edge.

[0008] Further, the second positioning ring has an extended section formed axially at one end thereof after extending and radially tapering inwardly, the first positioning ring and the second positioning ring are sleeved on the second section, one end of the first positioning ring abuts against one end of the first bearing away from the flange, one end of the first positioning ring away from the first bearing abuts against one end of the second positioning ring, the extended section of the other end of the second positioning ring is sleeved on the third section, and the third positioning ring is sleeved on the third section, one end of the third positioning ring abuts against the extended section.

[0009] Further, the second positioning ring is made of copper.

[0010] Further, the second positioning ring is made of plastic.

[0011] Comparison with the effect of the prior art:

[0012] The bicycle rear hub structure has the following advantages: the positioning ring set is arranged between the hub and the ratchet sleeve, the first positioning ring, the second positioning ring and the third positioning ring are sleeved on the mandrel and abut against each other, one end of the first positioning ring away from the second positioning ring abuts against the first bearing in the hub, one end of the third positioning ring away from the second positioning ring abuts against the second bearing in the ratchet sleeve, the three positioning rings and the two bearings abut against each other to rotate, and the radial loose fit can compensate for the difference in concentricity between the hub, the mandrel, the ratchet sleeve and the bearings, so that the hub rotates more smoothly, the structure is simple, the production speed is fast, the cost is low, the practicability and convenience are excellent, the extended section at one end of the second positioning ring is designed, a gap is arranged between the outer ring surface of the second positioning ring and the inner ring surface of the hub and the ratchet sleeve, the gap can compensate for the difference in concentricity between the hub, the mandrel, the ratchet sleeve and the bearings, so that the hub rotates more smoothly, the second section and the third section of the mandrel are designed, the outer diameter of the second section is greater than that of the third section, the strength between the hub and the ratchet sleeve is increased, the outer periphery of the mandrel is designed in a stepped manner, the outer diameter of the second section is larger to improve the lateral strength, the second positioning ring can be made of copper or plastic to improve the rotation smoothness and light weight, the first positioning ring and the third positioning ring can be made of steel, aluminum or copper, and have the characteristic of steel to improve the rotation smoothness and stability. BRIEF DESCRIPTION OF DRAWINGS

[0013] The utility model will be explained further in detail in connection with the drawings and specific embodiments.

[0014] Figure 1 It is the stereoscopic appearance view of a preferable embodiment of the utility model;

[0015] Figure 2 It is the stereoscopic exploded view of a preferable embodiment of the utility model;

[0016] Figure 3 A sectional view of a preferred embodiment of the present application;

[0017] Figure 4 A sectional view of a preferred embodiment of the present application; Figure 1 ;

[0018] Figure 5 A sectional view of a preferred embodiment of the present application; Figure 2 .

[0019] BRIEF DESCRIPTION OF DRAWINGS

[0020] Outer diameter D1;

[0021] Outer diameter D2;

[0022] Gap H;

[0023] Flower drum 10;

[0024] Accommodation space 11;

[0025] Ratchet 12;

[0026] First bearing 13;

[0027] Spindle 20;

[0028] First section 21;

[0029] Second section 22;

[0030] Third section 23;

[0031] Stop rim 24;

[0032] Step rim 25;

[0033] Positioning ring group 30;

[0034] First positioning ring 31;

[0035] Second positioning ring 32;

[0036] Extension section 321;

[0037] Third positioning ring 33;

[0038] Ratchet sleeve 40;

[0039] Pawl seat 41;

[0040] Pawl 42;

[0041] Second bearing 43. DETAILED DESCRIPTION

[0042] First, please refer to Figures 1-5The utility model provides a bicycle rear hub structure, it mainly includes: a hub 10, a mandrel 20, a positioning ring group 30 and a ratchet sleeve 40.

[0043] The hub 10 is recessed with a containing space 11 at one end, and a plurality of ratchet teeth 12 are arranged on the inner wall of the containing space 11.

[0044] A mandrel 20 is arranged in the hub 10, and a first section 21, a second section 22 and a third section 23 are sequentially arranged on the outer periphery of the mandrel 20, and the first section 21, the second section 22 and the third section 23 are in a stepped shape, one end of the first section 21 away from the second section 22 is connected to the inside of the hub 10, the outer diameter of the second section 22 is D1, the outer diameter of the third section 23 is D2, and D1>D2, a stop edge 24 is formed between the first section 21 and the second section 22, a step edge 25 is formed between the second section 22 and the third section 23, a first bearing 13 is arranged between the containing space 11 of the hub 10 and the second section 22, and one end of the first bearing 13 abuts against the stop edge 24.

[0045] The positioning ring group 30 includes a first positioning ring 31, a second positioning ring 32 and a third positioning ring 33, the first positioning ring 31 and the third positioning ring 33 are in a ring shape, the second positioning ring 32 is slightly in a sleeve shape and has a predetermined height, one end of the second positioning ring 32 extends and radially and obliquely shrinks, and an extension section 321 is formed axially, the first positioning ring 31 and the second positioning ring 32 are arranged on the second section 22, one end of the first positioning ring 31 abuts against one end of the first bearing 13 away from the stop edge 24, one end of the first positioning ring 31 away from the first bearing 13 abuts against one end of the second positioning ring 32, the extension section 321 of one end of the second positioning ring 32 is arranged on the third section 23, the third positioning ring 33 is arranged on the third section 23, one end of the third positioning ring 33 abuts against the extension section 321, and the second positioning ring 32 can be made of copper or plastic, which can improve the rotation smoothness and lightness.

[0046] The ratchet sleeve 40 is sleeved with a flywheel set at one end to drive the ratchet sleeve to rotate synchronously, and is provided with a pawl seat 41 corresponding to the ratchet teeth 12 at the other end, the pawl seat 41 is provided with a plurality of pawls 42 around the circumferential surface, and a second bearing 43 is sleeved in the pawl seat 41, the ratchet sleeve 40 is sleeved in the accommodation space 11, the pawls 42 are engaged with the ratchet teeth 12, the mandrel 20 is sleeved in the ratchet sleeve 40, the second section 22 and the third section 23 are sleeved in the ratchet sleeve 40, the third section 23 is connected with the ratchet sleeve 40 at the end away from the second section, the second positioning ring 32 is located between the pawl seat 41 and the second section 22, the second bearing 43 is sleeved on the third section 23, and the second bearing 43 is in abutment with the third positioning ring 33 at one end, and the second positioning ring 32 is provided with a gap H between the inner ring surface of the ratchet sleeve 40 and the hub 10, thereby forming a rear hub structure.

[0047] Through the above-mentioned components, the hub 10 and the ratchet sleeve 40 are provided with a positioning ring set 30, the first positioning ring 31, the second positioning ring 32 and the third positioning ring 33 are in abutment on the mandrel 20, the first positioning ring 31 is in abutment with the first bearing 13 in the hub 10 at the end away from the second positioning ring 32, the third positioning ring 33 is in abutment with the second bearing 43 in the ratchet sleeve 40 at the end away from the second positioning ring 32, the three positioning rings and the two bearings are in abutment and cooperation to rotate, and are radially loosely matched to compensate for the difference in concentricity between the hub 10, the mandrel 20, the ratchet sleeve 40 and the bearings, so that the hub 10 rotates more smoothly, the components are simple, the production speed is fast and the cost is low, and the overall structure is very innovative and practical.

[0048] In order to further understand the structural features, technical means and expected effects of the utility model, the use mode of the utility model will be described as follows:

[0049] The mandrel 20 is sleeved in the hub 10, the first bearing 13 is in abutment with the blocking rim 24 at one end, then the first positioning ring 31, the second positioning ring 32 and the third positioning ring 33 are sequentially sleeved on the mandrel 20, the first positioning ring 31 is in abutment with the first bearing 13, the ratchet sleeve 40 is sleeved in the accommodation space 11, the second positioning ring 32 is arranged between the mandrel 20 and the pawl seat 41, the extension section 321 is in abutment with the third positioning ring 33 at one end, and the third positioning ring 33 is in abutment with the second bearing 43 at the other end, and the assembly is completed.

[0050] The bicycle rear hub structure, positioning ring set 30 is arranged between the hub 10 and the ratchet sleeve 40, the first positioning ring 31, the second positioning ring 32 and the third positioning ring 33 are sleeved on the mandrel 20 and abut each other, one end of the first positioning ring 31, away from the second positioning ring 32, abuts the first bearing 13 in the hub 10, one end of the third positioning ring 33, away from the second positioning ring 32, abuts the second bearing 43 in the ratchet sleeve 40, the three positioning rings and the two bearings abut each other to rotate, and the radial loose fit can compensate the difference in concentricity between the hub 10, the mandrel 20, the ratchet sleeve 40 and the bearings, so that the hub 10 rotates more smoothly, the components are simple, the production speed is fast, the cost is low, excellent practicability and convenience are achieved, and the second positioning ring 32 is designed in cooperation with the extension section 321 at one end, a gap H is arranged between the outer ring surface of the second positioning ring 32 and the inner ring surface of the hub 10 and the ratchet sleeve 40, the gap can compensate the difference in concentricity between the hub 10, the mandrel 20, the ratchet sleeve 40 and the bearings, so that the hub 10 rotates more smoothly.

[0051] The second section 22 and the third section 23 of the mandrel 20 are designed, the outer diameter D1 of the second section 22 is greater than the outer diameter D2 of the third section 23, the strength between the hub 10 and the ratchet sleeve 40 can be increased, and the outer periphery of the mandrel 20 is designed in a stepped shape, the outer diameter of the second section 22 is larger, and the lateral strength is improved.

[0052] The second positioning ring 32 can be made of copper or plastic material, the rotating smoothness and light weight can be improved, the first positioning ring 31 and the third positioning ring 33 can be made of steel, aluminum or copper, and have the characteristics of steel, so that the rotating smoothness and stability can be improved.

[0053] In summary, the bicycle rear hub structure provides a positioning structure with a positioning ring set 30, the positioning ring set 30 is arranged between the hub 10 and the ratchet sleeve 40, the positioning ring set 30 is sleeved with a plurality of positioning rings that abut each other on the mandrel 20, the plurality of positioning rings and the two bearings abut each other to rotate, radial loose fit is formed, the gap between them can compensate the difference in concentricity between the hub 10, the mandrel 20, the ratchet sleeve 40 and the bearings, so that the hub 10 rotates more smoothly, the components are simple, the production speed is fast, the cost is low, the whole has industrial practicability and innovation benefit, and the structure has not been seen in books or publicly used, and meets the requirements of the utility model patent application.

[0054] The above is a specific embodiment of the utility model and the technical principle used, if changes are made according to the concept of the utility model, the functional effect generated still does not exceed the spirit covered by the specification and drawings, and should be within the scope of the utility model.

Claims

1. A bicycle rear hub structure, characterized in that: include: A hub, one end of which is concavely provided with a receiving space, the inner wall of which is surrounded by a plurality of ratchet teeth; A spindle is passed through the hub, and a first section, a second section, and a third section are sequentially provided on the outer circumference of the spindle, and each of the first section, the second section, and the third section is stepped. An end of the first section away from the second section is connected to the interior of the hub, and a first bearing is sleeved between the accommodating space and the second section. a positioning ring assembly, comprising a first positioning ring, a second positioning ring, and a third positioning ring, wherein the first positioning ring and the third positioning ring are ring-shaped, and the second positioning ring is sleeve-shaped and has a preset height. The first positioning ring and the second positioning ring are sleeved on the second section, one end of the first positioning ring abuts against the second positioning ring, and the other end of the first positioning ring abuts against the first bearing. The third positioning ring is sleeved on the third section, and one end of the third positioning ring abuts against the second positioning ring; A ratchet sleeve, one end of which is sleeved with a flywheel assembly, and the other end of the ratchet sleeve is provided with a pawl seat corresponding to the ratchet teeth, a plurality of pawls are arranged around the circumference of the pawl seat, and a second bearing is sleeved inside the pawl seat, one end of the ratchet sleeve is passed through the accommodating space, each pawl is engaged with the ratchet teeth, the spindle passes through the ratchet sleeve, the second section and the third section are passed through the ratchet sleeve, one end of the third section away from the second section is connected to the ratchet sleeve assembly, the second positioning ring is located between the pawl seat and the second section, and one end of the second bearing is in contact with the third positioning ring.

2. The bicycle rear hub structure according to claim 1, wherein: The outer diameter of the second section of the spindle is greater than that of the third section. A retaining edge is formed between the first section and the second section. A step edge is formed between the second section and the third section. One end of the first bearing abuts against the retaining edge.

3. The bicycle rear hub structure according to claim 2, wherein: One end of the second positioning ring extends and is radially and obliquely reduced inward to form an axial extension section. The first positioning ring and the second positioning ring are sleeved on the second section, and one end of the first positioning ring and the end of the first bearing away from the retaining edge are in contact with each other, so that the end of the first positioning ring away from the first bearing and one end of the second positioning ring are in contact with each other, and the extension section of the other end of the second positioning ring is sleeved on the third section, and the third positioning ring is sleeved on the third section, and one end of the third positioning ring and the extension section are in contact with each other.

4. The bicycle rear hub structure according to claim 1, wherein: The second positioning ring is made of copper.

5. The bicycle rear hub structure according to claim 1, wherein: The second positioning ring is made of plastic.

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