CN202690817U

CN202690817U - Hub bearing structure

Info

Publication number: CN202690817U
Application number: CN 201220310216
Authority: CN
Inventors: 李健豪
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-06-29
Filing date: 2012-06-29
Publication date: 2013-01-23
Anticipated expiration: 2022-06-29

Abstract

The utility model relates to a hub bearing structure, which comprises a hub body, a ratchet wheel sleeve, a bearing group and a mandrel, wherein the ratchet wheel sleeve is assembled at one end of the hub body; a ratchet wheel structure is arranged between the ratchet wheel sleeve and the hub body; a first bearing is arranged at the inner part of one end of the hub body; a second bearing is arranged at the inner part of one end of the ratchet wheel sleeve; a third bearing is arranged at a part of the hub body which corresponds to the ratchet wheel sleeve; a first ring cover is arranged on the third bearing; a second ring cover and a third ring cover are arranged at the outer part of the first ring cover; and the mandrel passes through the hub body and the ratchet wheel sleeve. With the help of the members, the third bearing is in two-in-one bearing design, so that the tolerance and the clearance between the third bearing and the mandrel can be reduced, the concentricity can be improved, and collision, noise or deviation can be effectively avoided; and the hub bearing structure with the simple members is convenient to assemble, and the whole structure is convenient and practical.

Description

The flower-drum bearing structure

Technical field

The utility model is relevant for a kind of flower-drum bearing structure, and espespecially a kind of two-in-one type, the tolerance in the time of can reducing assembling effectively promote concentricity and working life, can guarantee to rotate smooth and easy and convenient group of flower-drum bearing structure of establishing effect of tool.

Background technique

The rear drum of bicycle is mainly the position of wheel shaft location and drive rim rotation, rear drum one side is provided with the ratchet carriage with the flywheel assembly, rear drum and ratchet carriage are respectively and be provided with bearing between axle, and utilize ratchet structure to drive trailing wheel to produce single direction rotation between rear drum and ratchet carriage and advance, so the design of rear drum bearing structure there is great impact to the smoothness of concentricity and transmission.

General common rear drum is equipped with an axle, and axle is worn ratchet carriage, make this ratchet carriage be socketed on rear drum one side, these rear drum two ends and ratchet carriage two ends are respectively equipped with a bearing between axle, when this rear drum and ratchet carriage rotate mutually, can utilize ratchet structure to produce single direction rotation, and borrow respectively this bearing, provide between this rear drum and ratchet carriage to be synchronous rotary, or ratchet carriage is fixed and effect that rear drum can rotate separately.

Existing flower-drum bearing structure, such as No. 100213358 new patent of TaiWan, China disclosed " bicycle flower hub structure ", comprise a hub body, a running-on is respectively offered at these hub body two ends, inside is then run through an axle is set, and the part that this axle passes the running-on of hub body respectively forms one and connects the section of establishing; A well slot is inwardly offered respectively at one flywheel bearing two ends, accommodating one first Bearing of a well slot wherein, another well slot is accommodating one second Bearing then, this flywheel bearing, this first, second Bearing are run through by the section of establishing that connects of axle one end, this flywheel bearing is serially connected with the hub body side and establishes with the running-on group of one end, this first Bearing is positioned at the end near running-on, and this second Bearing then is positioned at the end away from running-on; This axle end is provided with a terrace edge corresponding with the second Bearing, this flywheel bearing is established the capping that can seal well slot in being provided with the second Bearing place, make the second Bearing be subject to the sandwiched location of terrace edge and capping, and this axle is in the sheathed packing ring in nearly the first Bearing place, the running-on of the corresponding flywheel bearing of this hub body is installed with one the 3rd Bearing, and the packing ring two ends are subjected to respectively abutting against of the first Bearing and the 3rd Bearing.

Another existing flower-drum bearing structure such as No. 100206945 new patent of TaiWan, China disclosed " can change the ratchet wheel hub of jumping-off module ", comprises: a mandrel unit, extend along an axial direction; One housing, supported by this mandrel unit and can rotate around this axis, comprise one around this axis and define the surrounding wall of an endoporus, reach the several openings and the number containing groove that radially are arranged with outward and are positioned at this endoporus one end from an internal face of this surrounding wall, each containing groove has respectively groove bottom and a pin-joint part away from this opening; One driver element is supported by this mandrel unit and can rotate around this axis, comprises the ratchet ring that stretches in this endoporus and face described containing groove; And a linkage unit, comprising: the number ratchets, to install respectively in described each containing groove, each ratchet has respectively a rotation section that is installed on pivotly this pin-joint part, and a claw that extends through this opening from this rotation section; The number elastic component; And number stop plug; Wherein, in each containing groove, install this elastic component and this stop plug at least one of them, with so that the claw of this ratchet and this ratchet ring mesh.

Above-mentioned institute takes off in the structure, both be arranged with ratchet carriage in hub shell body one end, hub shell body and ratchet carriage corresponding part are respectively equipped with bearing (Bearing), and if axle wears respectively this bearing, so that the hub shell body is supported by axle, make whereby hub body to turn round with respect to bearing by axle, reach the running of vehicle wheel rotation.

But, the corresponding part is respectively equipped with a bearing between existing flower hub and ratchet carriage, easily because spending the tolerance of size of hub, or with the caliber tolerance of axle, cause in bearing and axle combination place and produce excessive clearance, cause decentraction between colored hub and ratchet carriage, respectively this bearing one side and the mutual frictional impact of axle that cause both, and the generation noise, the smoothness that beat impact flower hub rotates, perhaps produce improper slippage and affect the bearing locating effect with respect to axle, and can produce abrasion to combination place under long-term the use damages, and reduce flower hub working life, and respectively this bearing size between various colored hub and ratchet carriage is diversified in specifications, and the hotel owner is difficult for changing, and easily cause easily damage of bearings in the assembly process, overall structure truly has necessity to be improved; So the utility model people further provides a tool the practical flower-drum bearing structure of innovating for foregoing problems.

The model utility content

One of the utility model purpose is namely providing a kind of flower-drum bearing structure, be provided with a bearing in flower-drum body and ratchet carriage corresponding part, its inside is provided with a ring set, and the outside is provided with two ring sets, between ring set and be provided with the rolling group, form the two-in-one type bearing, for rotating respectively between flower-drum body and ratchet carriage, the design of this bearing, can reduce tolerance and clearance when assembling with axle, effectively promote concentricity, produce the scarce frauds such as collision, noise or skew in the time of can avoiding rotating, to reach the effect in lift structure intensity and working life.

Two of the utility model purpose is namely providing a kind of flower-drum bearing structure, and its member is simple, can convenient assemble, and is not fragile in the assembly process, to reach splendid convenient utility.

Three of the utility model purpose is namely providing a kind of flower-drum bearing structure, and two relative between each ring set of this bearing sides are respectively equipped with the inclined-plane, can be offset and be difficult for producing for the displacement of taking advantage of a situation between ring set and rolling group, guarantees concentricity and rotates smoothness.

In view of this, a kind of flower-drum bearing structure that the utility model has disclosed, it includes: a flower-drum body, be the hollow cylinder that two ends connect, the one end is provided with one and meets the section of establishing; One ratchet carriage is the hollow cylinder that two ends connect, and one end and this connect the mutual winding of the section of establishing, and this ratchet carriage and this connect and be provided with a ratchet structure between the section of establishing; One bearing pack, comprise by a clutch shaft bearing, one second bearing and one the 3rd bearing form, it is provided with at least one clutch shaft bearing in this flower-drum body away from the end inside that this meets the section of establishing, be provided with at least one the second bearing in this ratchet carriage away from connecing an end inside of establishing the section connecting part with this, and be provided with the 3rd bearing in the corresponding part of this flower-drum body and this ratchet carriage, the 3rd bearing is comprised of several ring sets and several rolling groups, it is provided with one first ring set, one second ring set and one the 3rd ring set, it is outside that this second ring set and the 3rd ring set are sheathed on this first ring set, be respectively equipped with at least one rolling group between this first ring set and the second ring set and this first ring set and the 3rd ring set, make an end of the 3rd bearing tool the second ring set be mounted on this flower-drum body away from the end inside of this clutch shaft bearing, and make an end of the 3rd bearing tool the 3rd ring set be mounted on this ratchet carriage away from the end inside of this second bearing; One axle is hollow tubular, and it is arranged in this flower-drum body and this ratchet carriage, and wears this clutch shaft bearing, the second bearing and the 3rd bearing.

Wherein, the 3rd bearing comprises several ring sets and several rolling groups, it is provided with first ring set of preset length and default radius, second ring set and the 3rd ring set, the radius of this second ring set is greater than the radius of the first ring set, and the length of this second ring set is less than the length of the first ring set, it is outside to make this second ring set be sheathed on the first ring set one end, have default spacing between this first ring set and the second ring set and should be provided with continuously at least one rolling group in default spacing inside, the radius of the 3rd ring set is greater than the radius of the first ring set, and its length is less than the length of this first ring set, it is outside away from an end of the second ring set to make the 3rd ring set be sheathed on the first ring set, and the 3rd ring set and first ring inner room have default spacing and should be provided with continuously at least one rolling group in default spacing inside.

Wherein, this rolling group has several rolling elements.

Wherein, this rolling element is ball or roller

Wherein, the end away from the 3rd ring set between this first ring set and the second ring set is provided with a dustproof sheet, and the end away from the second ring set is provided with a dustproof sheet between this first ring set and the 3rd ring set.

Wherein, between this clutch shaft bearing and the 3rd bearing and be arranged in the axle outside and be provided with one first pipe, and between this second bearing and the 3rd bearing and be arranged in the axle outside and be provided with one second pipe.

Wherein, this rolling group has several rolling elements, and is inboard and be positioned at the relative both sides of rolling element and be respectively equipped with an inclined-plane between this first ring set and the 3rd ring set.

Wherein, relatively between the junction of this second ring set and flower-drum body inboard be provided with a miter, and relatively between the junction of the 3rd ring set and ratchet carriage inboard be provided with a miter.

Wherein, this the second ring set periphery is provided with first positioning part, this first positioning part is provided with at least one recess or a protuberance, this flower-drum body madial wall is provided with the 3rd positioning part, the 3rd positioning part is to should the first positioning part and relatively be provided with at least one protuberance or at least one recess, between this first positioning part and the 3rd positioning part mutually inlay card fix.

Wherein, the 3rd ring set periphery is provided with second positioning part, this second positioning part is provided with at least one recess or a protuberance, this ratchet carriage madial wall is provided with the 4th positioning part, the 4th positioning part is to should the second positioning part and relatively be provided with at least one protuberance or at least one recess, between the 4th positioning part and this second positioning part mutually inlay card fix.

The beneficial effects of the utility model are: the utility model disclosed " flower-drum bearing structure ", corresponding part between this flower-drum body and ratchet carriage is provided with the 3rd bearing, its inboard has the first ring set, and this first ring set outside is provided with the second ring set and the 3rd ring set, make this flower-drum body and ratchet carriage can distinguish turn, to reach the effect of one-way rotation, by above-mentioned member, the 3rd bearing is to be the two-in-one type design bearing, can reduce tolerance and clearance between itself and axle, promote concentricity, effectively avoid collision, the problem such as noise or skew, and its member is simple, convenient assembling, overall structure can reach convenient utility.

Description of drawings

Fig. 1 is the stereo appearance figure of the utility model one preferred embodiment.

Fig. 2 is the perspective exploded view of the utility model one preferred embodiment.

Fig. 3 is the stereo appearance figure of the utility model one preferred embodiment the 3rd bearing.

Fig. 4 is the assembled sectional view of the utility model one preferred embodiment.

Fig. 5 is the stereo appearance figure of the utility model the second embodiment the 3rd bearing.

Fig. 6 is the utility model the second embodiment's assembled sectional view.

Fig. 7 is the utility model the second embodiment's combination cutaway view Amplified image.

Fig. 8 is the utility model the 3rd embodiment's perspective exploded view.

Fig. 9 is the utility model the 3rd embodiment's assembled sectional view.

Figure 10 is one of the assembled sectional view at the utility model the 3rd another visual angle of embodiment.

Figure 11 be the utility model the 3rd another visual angle of embodiment assembled sectional view two.

Wherein:

10 flower-drum bodies 11 connect the section's of establishing 12 clutch shaft bearings

The 3rd positioning part, 13 inclined-planes 14 20 ratchet carriages

21 second bearings, 22 ratchet structures, 23 miters

24 the 4th positioning parts 30 the 3rd bearing 31 first ring sets

32 second ring sets, 322 first positioning parts, 311 inclined-planes

33 the 3rd ring sets, 331 inclined-planes, 332 miters

341 rolling elements are organized in 34 rollings of 333 second positioning parts

342 rollers, 35 dustproof sheets, 40 axles

Pipe 43 side covers in the pipe 42 second in 41 first.

Embodiment

At first please refer to Fig. 1～Fig. 4, a kind of flower-drum bearing structure provided by the utility model, it consists predominantly of: a flower-drum body 10, a ratchet carriage 20, a bearing pack and an axle 40.

This flower-drum body 10 is the hollow cylinder that two ends connect, and the one end is concaved with one and meets the section of establishing 11.

This ratchet carriage 20 is the hollow cylinder that two ends connect, and one end and this connect the section's of establishing 11 mutual windings, and this ratchet carriage 20 and meet 11 in the section of establishing and be provided with a ratchet structure 22.

This bearing pack comprises by a clutch shaft bearing 12, one second bearing 21 and one the 3rd bearing 30 and is formed, and it is provided with at least one clutch shaft bearing 12 in this flower-drum body 10 away from this end inside that meets the section of establishing 11; In this ratchet carriage 20 away from being provided with at least one the second bearing 21 with an end inside that connects the section of establishing 11 connecting parts; The 3rd bearing 30 is located at the corresponding part that flower-drum body 10 and ratchet carriage 20 join; This clutch shaft bearing 12 and the second bearing 21, mutually sheathed by two ring sets of predetermined inner diameter respectively, and be provided with a rolling group between two ring sets, so that the support effect of axle to be provided, and axle relatively bearing rotate; The 3rd bearing 30 comprises by several ring sets and several rolling groups and is formed, and it is provided with one first ring set 31, one second ring set 32 and one the 3rd ring set 33 of preset length and default radius.

The radius of this second ring set 32 is greater than the radius of the first ring set 31, and the length of the second ring set 32 is less than the length of the first ring set 31, it is outside to make this second ring set 32 be sheathed on the first ring set 31 1 ends, this first ring set 31 and 32 of the second ring sets have default spacing and are provided with at least one rolling group 34, and this rolling group 34 is provided with several rolling elements 341 continuously around 32 of the first ring set 31 and the second ring sets; The radius of the 3rd ring set 33 is greater than the radius of the first ring set 31, and its length is less than the length of this first ring set 31, it is outside away from an end of the second ring set 32 to make the 3rd ring set 33 be sheathed on the first ring set 31, the 3rd ring set 33 and 31 of the first ring sets have default spacing and are provided with continuously at least one rolling group 34 on every side, this rolling group 34 has several rolling elements 341, in present embodiment, be provided with two rolling groups 34, respectively should rolling group 34 have several rolling elements 341; 32 ends away from the 3rd ring set 33 of this first ring set 31 and the second ring set are provided with a dustproof sheet 35; 33 ends away from the second ring set 32 of this first ring set 31 and the 3rd ring set are provided with a dustproof sheet 35; Make an end of the 3rd bearing 30 tools the second ring set 32 be mounted on flower-drum body 10 away from the end inside of clutch shaft bearing 12, and make an end of the 3rd bearing 30 tools the 3rd ring set 33 be mounted on ratchet carriage 20 away from the end inside of the second bearing 21.

This axle 40, be hollow tubular, it is to wear this flower-drum body 10, and wear this clutch shaft bearing 12 and the 3rd bearing 30, these axle 40 another ends protrude from the section of establishing 11 that connects, and wear this ratchet carriage 20 and the second bearing 21, in this clutch shaft bearing 12 and 30 on the 3rd bearing and be arranged in axle 40 outsides and be provided with one first and manage 41, so that the support of 30 on this clutch shaft bearing 12 and the 3rd bearing to be provided, in addition in this second bearing 21 and 30 on the 3rd bearing and be arranged in axle 40 outsides and be provided with one second and manage 42, so that the support of 30 on this second bearing 21 and the 3rd bearing to be provided; This axle 40 2 ends and be positioned at flower-drum body 10 and an end of ratchet carriage 20 is respectively equipped with a side cover 43; Borrow the setting of the 3rd bearing 30, then 20 of this flower-drum body 10 and ratchet carriages can pass through respectively the second ring set 32 and the 3rd ring set 33, to rotate with respect to this axle 40.

By above-mentioned member, this flower-drum body 10 is respectively equipped with clutch shaft bearing 12 and the second bearing 21 with ratchet carriage 20 inner ends, and be equipped with axle 40, the corresponding part that this flower-drum body 10 and ratchet carriage are 20 is provided with the 3rd bearing 30, the 3rd bearing 30 inside have the first ring set 31, these the first ring set 31 outsides are arranged with respectively the second ring set 32 and the 3rd ring set 33, and be provided with rolling group 34 therebetween, form the two-in-one type bearing, can provide flower-drum body 10 and ratchet carriage 20 to rotate respectively, the 3rd bearing 30 can effectively be avoided producing excessive tolerance and clearance with axle 40 combinations place, can avoid frictional impact, the scarce fraud such as noise or beat, effectively promote the smoothness of rotating and overall structure working life, overall structure has practical convenience.

By for further understand the utility model structure characteristics, application technology means and the effect reached of expection, this is described below the utility model usage mode:

Establish for of the present utility model group, that the 3rd bearing 30 is mounted on flower-drum body 10 1 ends inside, then this flower-drum body 10 is worn mutually with axle 40, then this ratchet carriage 20 is worn mutually with axle 40 again, make this ratchet carriage 20 be socketed on an end of flower-drum body 10, and make the 3rd bearing 30 be mounted on the corresponding part of 20 of flower-drum body 10 and ratchet carriages, namely group is established and is finished.

Use of the present utility model when flywheel drives this ratchet carriage 20 rotation, is borrowed the second ring set 32 and the 3rd ring set 33 of the 3rd bearing 30, so that this flower-drum body 10 produces synchronous rotary with ratchet carriage 20 with respect to axle 40; If this flower-drum body 10 or ratchet carriage 20 are fixed when not operating, when namely 20 of this flower-drum body 10 and ratchet carriages can't transmissions, this flower-drum body 10 can be borrowed the second ring set 32, or this ratchet carriage 20 can be by means of the 3rd ring set 33 and with respect to axle 40 rotations, make 20 of this flower-drum body 10 and ratchet carriages can be relative idling conditions, to reach the effect that supports rotation.

Please refer to Fig. 5～shown in Figure 7, be the second embodiment of the present utility model, 33 inboards of this first ring set 31 and the 3rd ring set and be positioned at rolling element 341 two relative sides and be respectively equipped with an inclined-plane 311 wherein, 331, make when flywheel and rotate and when tearing ratchet carriage 20 skew, 33 of this first ring set 31 and the 3rd ring sets produce oblique active force, borrow this inclined-plane 311,331 design, this the first ring set 31 can be provided, 341 displacements of taking advantage of a situation of the 3rd ring set 33 and rolling element, to offset the active force of these ratchet carriage 20 skews, make this first ring set 31 and the 3rd ring set 33 be difficult for producing skew, promote and rotate smoothness and working life; Wherein the rolling element 341 of each rolling group 34 can be the application of ball or roller 342 etc.

Moreover, can relatively be provided with a

miter

321,13 between the junction of this second ring set 32 and flower-drum body 10 inboards, and the

relative miter

332,23 that is provided with between the junction of the 3rd ring set 33 and ratchet carriage 20 inboards, to reach the effect of inclined-plane packing location, make the 3rd bearing 30 strong fix in the corresponding part of 20 of flower-drum body 10 and ratchet carriages.

Please refer to Fig. 8～shown in Figure 11, be the 3rd embodiment of the present utility model, wherein the second ring set 32 peripheries of the 3rd bearing 30 are provided with one first positioning part 322, it is provided with at least one recess or a protuberance, the 3rd ring set 33 peripheries also can be provided with one second positioning part 333, it is provided with at least one recess or a protuberance, corresponding the first positioning part 322 of these flower-drum body 10 madial walls, and relatively be provided with one the 3rd positioning part 14 of protuberance or recess, for and 322 the mutual inlay cards in this first positioning part fix, to reach the effect of concavo-convex inlay card strong fix; Corresponding second positioning part 333 of this ratchet carriage 20 madial walls, and relatively be provided with one the 4th positioning part 24 of protuberance or recess, for and 333 the mutual inlay cards in this second positioning part fix, can reach equally the effect of concavo-convex inlay card strong fix.

The 3rd bearing 30 of the present utility model, be mounted on the corresponding part of this flower-drum body 10 and ratchet carriage 20, the 3rd bearing 30 inside are provided with the first ring set 31, its outside two ends are respectively equipped with the second ring set 32 and the 3rd ring set 33, and this first ring set 31 and the second ring set 32 and 33 of the 3rd ring sets are respectively equipped with rolling group 34, form the bearing of two-in-one type, provide 20 of this flower-drum body 10 and ratchet carriages to rotate respectively, the design of the 3rd bearing 30 can reduce tolerance and the clearance when assembling between axle 40 and bearing, promote the concentricity when rotating, produce frictional impact when effectively avoiding rotating, the scarce fraud such as noise or skew, but and lift structure intensity and working life, its member is simple and can convenient assemble, and is difficult for causing damage of bearings in the assembly process, then can reach splendid practicability and convenience.

33 two relative sides of this first ring set 31 and the 3rd ring set are respectively equipped with inclined-plane 311,331, when tearing the ratchet carriage skew when the flywheel rotation, this inclined-plane 311,331 can supply the first ring set 31, the 3rd ring set 33 and 341 displacements of taking advantage of a situation of rolling element, make this first ring set 31 and the 3rd ring set 33 be difficult for producing skew, guarantee concentricity, promote and rotate smoothness and working life; Can relatively be provided with a

miter

321,13 between the junction of this second ring set 32 and flower-drum body 10 inboards, and between the junction of the 3rd ring set 33 and ratchet carriage 20 inboards the

relative miter

332,23 that is provided with, to reach the effect of inclined-plane packing and strong fix.

This flower-

drum body

10,30 relative Position Designs that are provided with the concave, convex inlay card of ratchet carriage 20 and the 3rd bearing are to reach the effect of strong fix.

Comprehensively above-mentioned, the utility model disclosed " flower-drum bearing structure ", provided the bearing structure of a tool two-in-one type, the corresponding part that this flower-drum body 10 and ratchet carriage are 20 is provided with the 3rd bearing 30, its inboard has the first ring set 31, and these the first ring set 31 outsides are provided with the second ring set 32 and the 3rd ring set 33, make this flower-drum body 10 can distinguish turn with ratchet carriage 20, to reach the effect of one-way rotation, and the 3rd bearing 30 can reduce tolerance and the clearance of 40 of itself and axles, promote concentricity, produce frictional impact when avoiding relatively rotating between axle 40 and bearing, noise or offset problem effectively promote and rotate smoothness and working life, and its member is simple simultaneously, can convenient assemble, so that whole really tool industrial applicability and innovation benefit, and it consists of structure and had not seen again all books and periodicals or open use, really meets new patent application important document, earnestly asks explicit example for reference, grant a patent early, most sense is prayed.

What need Chen Ming is, the above is specific embodiment of the utility model and the know-why used, if comply with the change that conception of the present utility model is done, when its function that produces does not exceed specification and graphic contain spiritual yet, all should in scope of the present utility model, close and give Chen Ming.

Claims

1. a flower-drum bearing structure is characterized in that, includes:

A flower-drum body is the hollow cylinder that two ends connect, and the one end is provided with one and meets the section of establishing;

A ratchet carriage is the hollow cylinder that two ends connect, and one end and this connect the mutual winding of the section of establishing, and this ratchet carriage and this connect and be provided with a ratchet structure between the section of establishing;

A bearing pack, comprise a clutch shaft bearing, second bearing and the 3rd bearing, this bearing pack is to be provided with at least one clutch shaft bearing in this flower-drum body away from the end inside that this meets the section of establishing, be provided with at least one second bearing in this ratchet carriage away from connecing an end inside of establishing the section connecting part with this, and be provided with the 3rd bearing in the corresponding part of this flower-drum body and this ratchet carriage, the 3rd bearing is comprised of several ring sets and several rolling groups, and be provided with first ring set, second ring set and the 3rd ring set, it is outside that this second ring set and the 3rd ring set are sheathed on this first ring set, be respectively equipped with at least one rolling group between this first ring set and the second ring set and this first ring set and the 3rd ring set, make an end of the 3rd bearing tool the second ring set be mounted on this flower-drum body away from the end inside of this clutch shaft bearing, and make an end of the 3rd bearing tool the 3rd ring set be mounted on this ratchet carriage away from the end inside of this second bearing;

An axle is hollow tubular, is arranged in this flower-drum body and this ratchet carriage, and wears this clutch shaft bearing, the second bearing and the 3rd bearing.

2. flower-drum bearing structure as claimed in claim 1, it is characterized in that, the 3rd bearing comprises several ring sets and several rolling groups, and be provided with first ring set of preset length and default radius, second ring set and the 3rd ring set, the radius of this second ring set is greater than the radius of the first ring set, and the length of this second ring set is less than the length of the first ring set, it is outside to make this second ring set be sheathed on the first ring set one end, have default spacing between this first ring set and the second ring set and should be provided with continuously at least one rolling group in default spacing inside, the radius of the 3rd ring set is greater than the radius of the first ring set, and its length is less than the length of this first ring set, it is outside away from an end of the second ring set to make the 3rd ring set be sheathed on the first ring set, and the 3rd ring set and first ring inner room have default spacing and should be provided with continuously at least one rolling group in default spacing inside.

3. flower-drum bearing structure as claimed in claim 1 or 2 is characterized in that, this rolling group has several rolling elements.

4. flower-drum bearing structure as claimed in claim 3 is characterized in that, this rolling element is ball or roller.

5. flower-drum bearing structure as claimed in claim 1 is characterized in that, the end away from the 3rd ring set between this first ring set and the second ring set is provided with a dustproof sheet, and the end away from the second ring set is provided with a dustproof sheet between this first ring set and the 3rd ring set.

6. flower-drum bearing structure as claimed in claim 1 is characterized in that, between this clutch shaft bearing and the 3rd bearing and be arranged in the axle outside and be provided with one first pipe, and between this second bearing and the 3rd bearing and be arranged in the axle outside and be provided with one second pipe.

7. flower-drum bearing structure as claimed in claim 1 is characterized in that, this rolling group has several rolling elements, and is inboard and be positioned at the relative both sides of rolling element and be respectively equipped with an inclined-plane between this first ring set and the 3rd ring set.

8. flower-drum bearing structure as claimed in claim 1 is characterized in that, relatively between the junction of this second ring set and flower-drum body inboard is provided with a miter, and relatively between the junction of the 3rd ring set and ratchet carriage inboard is provided with a miter.

9. flower-drum bearing structure as claimed in claim 1, it is characterized in that, this the second ring set periphery is provided with first positioning part, this first positioning part is provided with at least one recess or a protuberance, this flower-drum body madial wall is provided with the 3rd positioning part, the 3rd positioning part is to should the first positioning part and relatively be provided with at least one protuberance or at least one recess, between this first positioning part and the 3rd positioning part mutually inlay card fix.

10. flower-drum bearing structure as claimed in claim 1, it is characterized in that, the 3rd ring set periphery is provided with second positioning part, this second positioning part is provided with at least one recess or a protuberance, this ratchet carriage madial wall is provided with the 4th positioning part, the 4th positioning part is to should the second positioning part and relatively be provided with at least one protuberance or at least one recess, between the 4th positioning part and this second positioning part mutually inlay card fix.