CN101391642B

CN101391642B - Multi-stage speed changing box for bicycle

Info

Publication number: CN101391642B
Application number: CN2008103055246A
Authority: CN
Inventors: 冯志君; 覃新宇
Original assignee: Guangxi University of Science and Technology
Current assignee: Guangxi University of Science and Technology
Priority date: 2008-11-13
Filing date: 2008-11-13
Publication date: 2012-05-23
Anticipated expiration: 2028-11-13
Also published as: CN101391642A

Abstract

The invention discloses a multi-level bicycle gear box, which has following structure: an input shaft inside a shell of the gear box is provided with a central gear which is kept normal joggled with a change gear with flexible shifts, the change gear is connected with a change deflector, a multi-level variable-transmission gear set that is shifting connected with the change gear and formed by multiple normally jogged gears that have nested gears is arranged outside the change gear, and a gear shaft in the multi-level variable-transmission gear set is taken as an output shaft. The multi-level bicycle gear box is particularly applicable to high-speed bicycles, and can solve the problems of lack of simultaneous multi-level transmission, large transmission ratio and small box thickness in the prior art.

Description

Multi-stage speed changing box for bicycle

Technical field

The present invention relates to the mechanical transmission technical field, especially a kind of change speed gear box that has multi-change speed on the bicycle that is used in.

Background technology

From the angle of environmental protection and nationwide fitness programs, the bicycle of various styles will be a kind of vehicle of main flow.Though China is a bicycle big country, the style of bicycle and performance are very slow in development in recent decades.Bicycle in the market on style, have increase the weight of, light, folding three major types; On performance, have common and speed governing two major types bicycles; Though can do walking-replacing tool fully, be difficult to satisfy the demand of modern crowd's amusement and recreation, the tourism of suburbs middle and long distance as short distance.

A kind of " bicycle height dual drive " disclosed among the Chinese patent CN2163788Y; Its architectural feature is on the basis of existing bicycle, to set up the gear cluster transmission device; Promptly the top between chain wheel and flywheel is provided with the variable-speed drive that multi-group has big miniature gears and chain, through the engagement between gear and chain and gear meshing transferring power and increase, deceleration/decel.This driving device speed governing progression is many but its speed adjustable range is narrow, can not adapt to the high-revolving adjusting requirement of the modern means of communication.And such transmission structures is complicated, also usually receives the chain slippage to rudimentary ratio gear, even the puzzlement that comes off, and makes reliable transmission property reduce greatly.

The Chainless bicycle bevel gear actuating device that provides in the patent No. 94237490.8 though be a kind of Chainless bicycle, also has transmission speed ratio constant; Motion is steady, the hermetically sealed grease lubrication of ability, noiseless; Ride easily the advantage of Transmission long service life; But its bevel gear structural volume is difficult in the requirement that realizes multi-change speed in the space of common gear box more greatly, thereby has limited the increase of its speed governing progression.

At present documents and materials show: traditional various sprocket wheel variable speed bicycle speed governing progression can reach more than tens grades, but its transmitting ratio is less than 4, and speed adjustable range is very limited; The bicycle with toothed wheel of changeable transmission ratio speed adjustable range improves greatly, but because mostly the change speed gear box shape is square, gauge is big; Installation on bicycle; Not only can cause the discomfort of riding, but also can be because of receiving the restriction of structural volume, speed governing progression is difficult to be provided with more problem.

Summary of the invention

The object of the invention will provide a kind of multi-stage speed changing box for bicycle exactly, the excessive problem of gauge that is existing speed changing box for bicycle when multistage large speed ratio transmission that it is to be solved.

In order to address the above problem; This multi-stage speed changing box for bicycle technical scheme is: the housing that it has a change speed gear box be contained in this housing in input shaft and these parts identical of output shaft with prior art; Input shaft in the said housing is provided with a sun gear; The change gear of this sun gear and an activity displacement keeps the constant-mesh state; Said change gear is connected with a gear shift shifting part; Be provided with in the said change gear outside to switch with this change gear and engage, by the multi-change speed driving gear set that a plurality of gears that include nest connect into the mode of constant-mesh, described output shaft is a gear wheel shaft in the said multi-change speed driving gear set.

In the last scheme; Said multi-change speed driving gear set can alternately be meshed by nest and intermediate gear and constitute; Their connection can be adopted and replace the ingear mode by nest and intermediate gear and be connected, and also can adopt other array mode to connect; Switch in each gear that engages with said change gear, it is a kind of to be merely nest, also can only be the intermediate gear that connects nest, can also be that existing nest has the intermediate gear that connects nest again.For the ease of making and install and safeguarding that each nest in the described multi-change speed driving gear set can have identical structure, each intermediate gear in the said multi-change speed driving gear set also can have identical structure.Above-mentioned nest is generally dual gear.Said gear shift shifting part can be contained in and is positioned at the outer turning wheel of said housing and is connected with one; The structure of this turning wheel can comprise: the gear ring that is provided with external tooth and internal tooth; Be contained in the core wheel in this gear ring, be contained in the slide block in the position-limited trough of said core wheel and be contained in the clutch rocking bar on the said slide block through jointed shaft; Said jointed shaft is contained in the middle part of clutch rocking bar, and the lateral surface of said clutch rocking bar is equipped with elastic ball towards the inner toothed surface of said inner gear between the medial surface of said clutch rocking bar and the said core wheel; The conversion of said slide block position in said position-limited trough, said pellet shot from a slingshot is just correspondingly at the side direction opposite side sliding transform of said clutch rocking bar medial surface from said jointed shaft.

In the such scheme, described multi-change speed driving gear set can be the connection of speedup transmission, also can be the connection of deceleration transmission.

In the such scheme of the present invention, input shaft and output shaft are for the ease of argumentation and understand, and with the name that the power input direction of hypothesis is done, in use can confirm input shaft and output shaft according to the direction of power input.

Owing to adopted such scheme, the present invention compared with prior art, it is big that this multi-stage speed changing box for bicycle can obtain transmission progression, than greatly and the little effect of change speed gear box thickness, is particularly useful for making the high-speed bicycle of large speed ratio transmission the most at a high speed.

Design-calculated disk change speed gear box of the present invention, its outline diameter is 210mm, and gross thickness is 44mm, and is very close with the outward appearance and the size of ordinary bicycle chain cover, has 7 grades of speed-regulating functions simultaneously, and transmitting ratio reaches 9.2.Have compared with prior art elegant in shape, number of steps of speeds is many, the characteristics of speed-regulating range width.

Description of drawings

Fig. 1 is the front view of the embodiment of the invention one.

Fig. 2 is the cutaway view at A-A place among Fig. 1.

Fig. 3 is the cutaway view at B-B place among Fig. 2.

Fig. 4 is the cutaway view at C-C place among Fig. 3.

The specific embodiment

Below in conjunction with the accompanying drawing instance the present invention is made further detailed description:

Multi-stage speed changing box for bicycle shown in Figure 1, it has one by two parts fastening, and the outside has an input shaft 3 to pass the middle and lower part of housing 1, and is contained on the housing 1 through bearing and roller bearing end cap like the housing 1 of the change speed gear box of part Rotary-table geometric configuration.The turning wheel 2 that is used to accept gear shift power is housed outside the input shaft 3 on housing 1 right side.

Fig. 2, shown in Figure 3; Being contained in variable gear in this housing has by

dual gear

7,9,11,13,15,17,19 and is connected the multi-change speed driving gear set that the

intermediate gear

8,10,12,14,16,18 between these dual gears constitutes; These dual gears alternately are connected with intermediate gear, and keep the constant-mesh state.The structure of each dual gear wherein is all identical, when assembling, can exchange, and the big gear wheel number of teeth in these dual gears is 23, and the miniature gears number of teeth is 16; The structure of each intermediate gear wherein is also all identical, and the number of teeth is 17 the time also can exchange in assembling.19 the transmission direction from dual gear 7 to dual gear all is that intermediate gear is connected with the big gear wheel of previous stage dual gear and the miniature gears of back one-level dual gear respectively, constitutes the multi-change speed driving gear set of speedup step by step.

On input shaft 3, be connected with a sun gear 4 through flat key; The number of teeth of sun gear 4 is 25; Sun gear 4 and a number of teeth are that 25 change gear 6 keeps being connected of constant-mesh states; Axle one end of change gear 6 is contained in through plain bearing in the arc chute of housing 1, and the other end is contained in the axis hole of a gear shift shifting part 5, and gear shift shifting part 5 has an end to be sleeved on versatilely on the input shaft 3; Gear shift shifting part 5 rotates the rotation that can drive change gear 6 around input shaft 3; Gear shift shifting part 5 around input shaft 3 clockwise rotate can drive change gear 6 successively from dual gear 7 switch to,

dual gear

9,11,13,15,17,19, dual gear 19 the axle be output shaft, an end of its output shaft stretches out outside the side of housing 1.

Fig. 3, shown in Figure 4, turning wheel is made up of gear ring 2.1, clutch rocking bar 2.2, jointed shaft 2.3, elastic ball 2.4, slide block 2.5, core wheel 2.6 and end cap 2.7.The end cap 2.7 of turning wheel is contained on the gear shift shifting part 5 outside the input shaft 3 through flat key with core wheel 2.6; Gear ring 2.1 is contained in the outside of core wheel 2.6, and cylindrical one side of gear ring 2.1 is provided with and is used for and chain bonded assembly external tooth, is provided with in the inboard to be used for the internal tooth that engages with clutch rocking bar 2.2; On core wheel 2.6, be provided with position-limited trough; Slide block 2.5 is housed in this position-limited trough, and clutch rocking bar 2.2 is contained on the slide block 2.5 through jointed shaft 2.3, and jointed shaft 2.3 is contained in the middle part of clutch rocking bar 2.2; Clutch rocking bar 2.2 can be around jointed shaft 2.3 swings; An elastic ball 2.4 also is housed on core wheel 2.6, and elastic ball 2.4 acts on the medial surface of clutch rocking bar 2.2, and the lateral surface of clutch rocking bar 2.2 is in the face of the internal tooth of gear ring 2.1.In Fig. 4; When elastic ball 2.4 acts on the medial surface of clutch rocking bar 2.2 in jointed shaft 2.3 left sides; The left end of clutch rocking bar 2.2 is pushed in the internal tooth of gear ring 2.1, and rotating counterclockwise of gear ring 2.1 can drive gear shift shifting part 5 and rotate counterclockwise through clutch rocking bar 2.2, jointed shaft 2.3, slide block 2.5, core wheel 2.6 flat keys successively; On the contrary; When elastic ball 2.4 acts on the medial surface of clutch rocking bar 2.2 on jointed shaft 2.3 right sides; The right-hand member of clutch rocking bar 2.2 is pushed in the internal tooth of gear ring 2.1; Clockwise rotating of gear ring 2.1 can drive gear shift shifting part 5 and clockwise rotate through clutch rocking bar 2.2, jointed shaft 2.3, slide block 2.5, core wheel 2.6 flat keys successively; Let gear shift shifting part 5 bonded assembly change gears 6 switch on the different dual gears, thereby can make input shaft 3 and between the output shaft on the dual gear 19, obtain different speedup transmitting ratios.

The number of teeth structure of each gear of present embodiment can obtain 1.04,1.5,2.2,3.1,4.44,6.4,9.27 grades speedup transmission.Be under 1.5 the condition at the modulus of all gears; Housing outline diameter can do 210 millimeters; Gross thickness is 44 millimeters; Very close with the outward appearance and the size of ordinary bicycle chain cover, as the bicycle pedals crank shaft, output shaft can be processed realization high transmission ratio and the little lightweight high-speed bicycle of volume through the flywheel that chain drives on the bicycle rear axle with input shaft 3.At transmitting ratio is 1.04,1.495 o'clock, is that low speed, effort-saving are suitable for climbing, driving against the wind the time; Transmitting ratio is 2.149 o'clock, with ordinary bicycle same gear ratios is arranged, and drives identical; Other gear is that speedup is gone, and the exercise, the tourism that are suitable for different crowd are selected.The high transmission ratio of this change speed gear box is 9.2, is 26 inches, drives frequency and calculate for 40 times/minute that with wheel diameter the speed of driving can be real high-speed bicycle greater than the 60km/ branch.

In other embodiments, if be the basis with the foregoing description, change axle with other dual gear into as output shaft; Or all stretch out outside the housing as output shaft at the axle of a plurality of dual gears, it is little to obtain thickness equally, and transmission progression is many; The result that overall gear ratio is big; But can obtain more applications, these application can be to be used on the bicycle, can also be applied in the middle of other field equally.These changes and application are limited within the scope of this patent rights protection equally.

According to mechanical drive principle; In other embodiment that process of the present invention is carried out; The multi-change speed driving gear set adopts and to replace the ingear mode by nest and intermediate gear and be connected, or all can realize this multi-change speed transmission at nest a plurality of intermediate gears of connecting, and with each gear that the change gear switching engages in; Being designed to only is a kind of gear of nest; Still a kind of gear of intermediate gear that just connects nest, can also be existing nest have again connect nest intermediate gear all can, the applicant thinks that the multi-change speed driving gear set according to embodiment one this frame mode helps reduced volume; Be convenient to make, reduce manufacturing cost.

Claims

1. multi-stage speed changing box for bicycle; Include housing and be contained in input shaft and the output shaft on this housing; It is characterized in that: the input shaft in the said housing is provided with a sun gear; The change gear of this sun gear and an activity displacement keeps the constant-mesh state, and said change gear is connected with a gear shift shifting part, outside said change gear, is provided with to engage with this change gear switching; By the multi-change speed driving gear set that a plurality of gears that include nest connect into the mode of constant-mesh, described output shaft is a gear wheel shaft in the said multi-change speed driving gear set.

2. multi-stage speed changing box for bicycle according to claim 1; It is characterized in that: said multi-change speed driving gear set is alternately meshed by nest and intermediate gear and constitutes; Switching the gear that engages with said change gear is nest; The structure of each nest in the said multi-change speed driving gear set is identical, and the structure of each intermediate gear in the said multi-change speed driving gear set is identical.

3. multi-stage speed changing box for bicycle according to claim 2 is characterized in that: described nest is a dual gear.

4. multi-stage speed changing box for bicycle according to claim 1; It is characterized in that: said multi-change speed driving gear set is alternately meshed by nest and intermediate gear and constitutes; Switching the gear that engages with said change gear is intermediate gear; The structure of each nest in the said multi-change speed driving gear set is identical, and the structure of each intermediate gear in the said multi-change speed driving gear set is identical.

5. multi-stage speed changing box for bicycle according to claim 4 is characterized in that: described nest is a dual gear.

6. according to claim 1,2,3,4 or 5 described multi-stage speed changing box for bicycle, it is characterized in that: said gear shift shifting part is positioned at the outer turning wheel of said housing and is connected with being contained in.

7. multi-stage speed changing box for bicycle according to claim 6; It is characterized in that: said turning wheel comprises the gear ring that is provided with external tooth and internal tooth; Be contained in the core wheel in this gear ring, be contained in the slide block in the position-limited trough of said core wheel and be contained in the clutch rocking bar on the said slide block through jointed shaft; Said jointed shaft is contained in the middle part of clutch rocking bar, and the lateral surface of said clutch rocking bar is equipped with elastic ball towards the inner toothed surface of said inner gear between the medial surface of said clutch rocking bar and the said core wheel; The conversion of said slide block position in said position-limited trough, said pellet shot from a slingshot is just correspondingly at the side direction opposite side sliding transform of said clutch rocking bar medial surface from said jointed shaft.