CN2145753Y - Bicycle three-staged speed variable bottom bracket bearing - Google Patents

Abstract

The utility model discloses a three-stage speed changing centre shaft for a bicycle. A gearbox is installed on the position where a five-way joint of the existing bicycle is positioned, a centre shaft and a countershaft are arranged in the gearbox, and the countershaft is installed at the back part of the centre shaft; a main wheel disc is matched with the centre shaft, a driving wheel is in interference fit with the centre shaft and is engaged with a ratchet wheel (18) arranged on the countershaft, a sliding key is sheathed on the countershaft, three sets of ratchet wheels are arranged on the countershaft, and each set of ratchet wheels are engaged with and matched with each other according to the motion state. A three-jaw stage shifting bracket is arranged on one end of the countershaft, and a stage shifting rod line penetrates through a box body to a handle of the bicycle from the three-jaw stage shifting bracket to realize three-stage speed change.

Description

Bicycle three-staged speed variable bottom bracket bearing

The utility model relates to a kind of bicycle three-step gear shift axis, is specially adapted to become three speed shaft in bicycle, the three-wheel vehicle axis, belongs to traffic and transport field.

China produces and the outer variable speed bicycle that uses at present, generally be designed to hand-held design, its principle of work is to adopt the sprocket wheel of the different numbers of teeth of exchange to realize the speed ratio requirement, this device is higher to technological requirements such as steel product quality and heat treatments, and the too much speed change exchange of number of times, can reduce the service life of bicycle, and sprocket wheel, chain can't adopt totally-enclosed technology.Chinese patent CN2100354U discloses a kind of three fast bicycle shift axis for this reason, it the axis of output wheel, main third gear wheel, spline wheel by suit, be fixed with transfer wheel, pay the axle of paying that one grade of wheel was taken turns, paid to third gear, operating mechanism three parts such as gear shift frame and pedal constitute.Its shortcoming is that gear changing mode adopts engaging of protruding pin and hole, and the car on the go, protruding pin needs the regular hour with combining of hole, will inevitably influence switching speed like this, and the inertia that directly influence bicycle is understood in especially gear shift in the climbing process.Gear shift displacement needs finish in each gear rotates in addition, adopts the juncture of protruding pin and hole, spline and spline housing, during misoperation, will damage bicycle assembly parts and reduces its service life.

The purpose of this utility model is to be to overcome above-mentioned the deficiencies in the prior art part a kind of excellent in durability is provided the bicycle three-step gear shift axis that the torque resistant ability is strong, reasonable in design.

The purpose of this utility model is achieved in that on the position of existing bicycle bottom bracket, is provided with gearbox body, is provided with axis in the gearbox body and pays axle, pays the rear portion that axle is positioned at axis.The main rotary table of bicycle and output wheel flush fit, axle bowl are connected with casing, the horizontal bearing fit of disjunctor gear and axis, driving wheel be fastened on the axis with pair spool on ratchet be meshed.Sliding key sleeve is matched with to be paid on the axle, and negative axle two ends, the left and right sides are provided with negative shaft alignment fastening frame, and the left side is provided with pull back spring, the three-jaw gear is dialled frame; Sliding key sleeve is provided with ratchet (18), ratchet (18) is meshed with driving wheel on the axis and matches with ratchet (20), ratchet (23) matches with ratchet (25), ratchet (25) is meshed with the disjunctor gear, ratchet (28) matches with ratchet (29), and ratchet (29) is meshed with the disjunctor gear.In order to ensure the gear shift speed governing; be provided with pull back spring sheet (19) between ratchet (18) and (20); be provided with control position collar (21) and control position spring leaf (22) between ratchet (20) and (23); be provided with pull back spring sheet (24) between ratchet (23) and (25); be provided with control position collar (26), pull back spring sheet (27) between ratchet (25) and (28), the rear end of ratchet (29) is provided with thrust anti-friction pad (30).In order to make this device become an organic lubricated fully enclosed internal speed-changing mechanism, the surface of casing of the present utility model is provided with lubricating oil filler opening, pasta hole, maintenance and cleans mudhole and gear driving lever line fixed mount.

The purpose of this utility model can also reach by following measure: bicycle is provided with the axle bowl of increasing.In order to realize effective engagement of ratchet, the angle of ratchet is 3-5 °, and transmission of the present utility model is one-level 1:89 than number always, secondary 1:2.52, three grades of 1:3.15.

The drawing explanation of accompanying drawing:

Fig. 1 looks scheme drawing for a left side of the present utility model.

Fig. 2 is an integral structure scheme drawing of the present utility model.

Fig. 3 is a ratchet front elevational schematic of the present utility model.

Fig. 4 is the ratchet scheme drawing of the utility model ratchet.

Embodiment describes the utility model in detail below in conjunction with (accompanying drawing).

Embodiment of the present utility model: change the external form shape that strengthens existing bicycle " five-way ", make it to become a gearbox body (34), casing (34) adopts the punching press electroplating equipment wielding machine to process, and is ellipse garden stream line pattern.The utility model speed change form is the gear three-step gear shift, and gear adds up to 10, and modulus is 1.25, and the number of axle is that diaxon is axis (1) and pays axle (31).Transmission is 1:89 than number (the bicycle main rotary table calculates with the 48:19 tooth to the ratio number of flywheel) one-level always, and secondary is 1:2.52, and three grades is 1:3.15.Pasta hole (35) is arranged on the gearbox body (34), mudhole (36) is cleaned in maintenance, gear is dialled frame and is penetrated hole (37), this Kong Weisan hole, pay shaft alignment fastening frame (32) and (13) gear and dial frame pull back spring seat hole (39), pay shaft alignment fastening frame locknut (40), gear driving lever backguy fixed mount (42), lubricating oil filler opening (41).Driving wheel (9) adopts slip key type to cross and should be matched with on the axis (1), driving wheel (9) is meshed with ratchet (18) on paying the axle sliding key sleeve, whole ratchets and other parts of paying on the axle (31) are installed on earlier on the sliding key sleeve (17), packing into from the right side macropore of change speed gear box (34) then moves to rearward position, packs into from the change speed gear box left side and will pay spool fastening and lock with locknut (16) with negative shaft alignment fastening frame (13) paying axle (31) again.Main rotary table (3) is installed on earlier on the disjunctor output gear (33), then disjunctor output gear (33) is assemblied in axis (1), packs into from the change speed gear box right side again, cooperates adjustment with left-hand axis mouth (11).

Principle of work of the present utility model is: during cycle racing, driving wheel (9) on the axis (1) is passed to power on the ratchet of paying on the axle (18), by being installed in the gear control handgrip in the bicycle handle bar, dial frame (15) through steel wire backguy and gear driving lever (not looking out) through the three-jaw gear and tackle several ratchets on the axle, the different engagements of ratchet are controlled, power is being passed to respectively on the disjunctor output gear (33) that places on the axis then, the main rotary table of bicycle (3) is assemblied in disjunctor output gear (33) right side one end, the separated attitude of main rotary table and axis, main rotary table is exported the rotating speed different with axis by the speed change of inner gear of the gear box.The utility model is to carry out in conjunction with other design-calculated advantage under the prerequisite that keeps existing cycle frame, do not adopt bearing to cooperate and still adopt traditional right-hand axis mouth (2), left-hand axis mouth (11), add macro-axis bowl (4), axis left-hand axis bowl (10) and diffusing bead cooperate, and be and with locknut (12) on the left of the axis that they are fastening.Pay the rear that axle (31) is positioned at axis (1), pay the strong cover of cunning (17) that has on the axle (31) with its bearing fit, whole gears and other part paid on the axle (31) all cooperate with sliding strong cover (17).In bicycle when rotation,, all the gear external tooths all are in engagement, by being meshing with each other of different gears, cause different rotative speeds, are utilizing being meshing with each other of the several ratchets paid on the axle (31) and ratchet (43) to carry out the gear displacement with separating.Ratchet (20), (25), (29) adopt with sliding strong cover (17) but external diameter is no internal tooth longitudinal sliding motion cooperates, and ratchet (18), (23), (28) adopt and slide to be good for to overlap (17) but be has the internal tooth longitudinal sliding motion to cooperate.The gear displacement realizes by speed change handgrip on the Handlebar of bicycle and the gear driving lever between gear driving lever screw hole and the gear driving lever steel wire backguy fixed mount.Dial frame (15) to inner control by gear and realize, outwards control is realized by pull back spring (14).In order accurately to realize the gear displacement, pull back spring sheet of the present utility model and control position spring leaf adopt the steel disc of the different elastic force of different-thickness to make.The elastic force magnitude relationship of pull back spring sheet is (19)＞(22)＞(24).In the speed-raising process, the three-jaw gear is dialled frame (15) and is moved to the casing right side, promote ratchet (18), ratchet (23) is meshed with (25) both sides ratchet, this state is the middling speed range state, when carrying, dial frame (15) by the three-jaw gear and continue to move, ratchet (18) is meshed with (20) side direction ratchet realizes to the casing right side into high speed gear.Low gear design of the present utility model is not subjected to gear to dial the control of frame, low speed ratchet (28) is in engagement preparation work state for a long time with the ratchet of (29), during mid ranger, because of the number of teeth of the gear (6) on the disjunctor output gear (33) the number of teeth more than actual working state middle gear (7), cause empty cover, upward ratchet (29) is greater than the rotating speed of ratchet (28) paying axle (31), and the mode of operation of reduction of speed released ratchet (28) and keep to the gear case left side again and again by ratchet (29) like this.When the utility model changes mid ranger into high speed gear or changes low gear into mid ranger, just there is not ingear next stage two ratchet ratchets maintenance simultaneously mode of operation at upper class two ratchet ratchets, only after upper class two ratchets are meshing with each other, the next stage two gears state of just deactivating, and keep preparation reduction of speed mode of operation.In order to increase the engagement ability between ratchet, ratchet is processed into 3-5 ° angle.

Compared to existing technology, the utlity model has following advantage:

1, reasonable in design, long service life.

2, three class gear shift has wide range of applications.

3, simple in structure, cheap.

Claims (4)

1, a kind of bicycle three-step gear shift axis comprises axis, axle bowl, Y-axis mouth, it is characterized in that:

A, on the position of existing bicycle bottom bracket, be provided with gearbox body (34), be provided with axis (1) in the gearbox body, pay axle (31);

B, main rotary table (3) and output wheel (33) flush fit, axle bowl (4), (10) are connected with casing (34), disjunctor gear (6), (7), (8) and axis (1) be bearing fit laterally, driving wheel (9) cross should be matched with axis (1) go up with pay spool (31) on ratchet (18) be meshed;

C, sliding strong overlap (17) are matched with on pair axle (31), pay axle two ends, the left and right sides and are provided with a pair shaft alignment fastening frame (32), (13), and the left side is provided with pull back spring (14), the three-jaw gear is dialled frame (15); Sliding strong cover (17) is provided with ratchet (18), (20), (23), (25), (28), (29), ratchet (18) is meshed with driving wheel (9) on the axis and matches with ratchet (20), ratchet (23) matches with ratchet (25), ratchet (25) is meshed with the disjunctor gear, ratchet (28) matches with ratchet (29), and ratchet (29) is meshed with the disjunctor gear;

Be provided with pull back spring sheet (19) between d, ratchet (18), (20), be provided with control position collar (21) and control position spring leaf (22) between ratchet (20) and (23), be provided with the pull back spring sheet between ratchet (23) and (25), be provided with control position collar (26) between ratchet (25) and (28), pull back spring sheet (27), the rear end of ratchet (29) is provided with thrust anti-friction pad (30);

The surface of e, casing (34) is provided with lubricating oil filler opening (41), pasta hole (35), maintenance cleaning mudhole (36) and gear driving lever line fixed mount (42).

2, bicycle three-step gear shift axis according to claim 1 is characterized in that bicycle is provided with and adds macro-axis bowl (4).

3, bicycle three-step gear shift axis according to claim 1, the angle that it is characterized in that each ratchet ratchet is 3-5 °.

4, bicycle three-step gear shift axis according to claim 1 is characterized in that transmission is one-level 1:89 than number always, secondary 1:2.52, three grades of 1:3.15.

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