CN2383756Y - Bottom bracket bearing speed variator for manpower vehicle - Google Patents

Abstract

The utility model provides a center shaft speed changing device for a manpower vehicle, which is composed of a control mechanism, a speed changing mechanism and a casing; a chain wheel of a manpower vehicle is arranged on the outer side of the casing; the speed changing mechanism is arranged in the casing; the control mechanism comprises a handle, a steel cable and a guard sheet; the speed changing mechanism comprises a center shaft, a transmission shaft, a speed changing shaft, a driving gear, a transmission gear set and a speed changing gear set; a shaft groove is arranged on the speed changing shaft; a key base and a speed changing key are arranged in the shaft groove. The utility model is that different speed changing gears are fixed by the speed changing key in a circumferential direction to achieve the speed changing goal. The utility model has the characteristics of reasonable structure, high stability, high speed, smoothness, etc. The utility model can be used for various bicycles and tricycles.

Description

Shaft transmission in the rickshaw

The utility model relates to a kind of rickshaw, particularly the transmission system at rickshaw axis place.

Although the change-speed box structure on the rickshaw such as bicycle and three-wheel vehicle and of a great variety, from its principle, great majority are to adopt to stir chain, make to reach the speed change purpose on its chain wheel that is enclosed within different-diameter.These change-speed boxs are easy to again break down during actual the use because outside integral body was exposed to, particularly chain needed realize conversion in rotation, so the manufacture process requirement of change-speed box is higher, and service life is shorter.For this reason, Chinese patent 95200195.0 provides a kind of bicycle wheel disc change-speed box, and it is to adopt spiral yarn shaped disc circumference to be provided with teeth, and the cam and the groove that are provided with in the dish on six centrosymmetric open-work grooves and the edge reach the speed change purpose.Although this changer is simple in structure, be difficult for breaking down, its speed change inconvenience, area occupied are very big, are difficult to be widely used.

The purpose of this utility model is at the problems referred to above, provides that a kind of volume is little, speed change is convenient, shaft transmission in the rickshaw of long service life.

Shaft transmission is made up of control mechanism, speed-changing mechanism and housing in this rickshaw, the chain wheel of rickshaw is arranged at hull outside, speed-changing mechanism is located in the housing, control mechanism comprises the handle that is positioned on the rickshaw handle, at the catch and the steel rope that is connected handle and catch of hull outside, between housing and the catch controlling spring is set, there is limited bayonet at the handle place.Speed-changing mechanism by axis, transmission shaft, variable shaft, be fixed on driving gear on the axis, be fixed on the driving gear set on the transmission shaft and the change-gear set that is axially fixed on the variable shaft is formed, each variable gear of change-gear set is separate, and the hub groove is all arranged on it.Driving gear set and change-gear set have the gear of equal number, and are meshing with each other, and driving gear and one of them transmission gear are meshing with each other, and variable shaft passes housing, and chain wheel is fixed on the variable shaft outer end.Variable shaft is provided with axial trough, and keyseat is arranged in the axial trough, and variable speed bond is arranged on the keyseat, be provided with retracing spring between variable speed bond and the keyseat, be provided with governing spring between keyseat and the variable shaft, keyseat also is connected with governor lever, governor lever stretches out housing, contacts with catch in the control mechanism.In this change-speed box, the moment of torsion of axis is delivered on the chain wheel at last by driving gear, transmission gear and variable gear.On variable shaft, the speed change key length is slightly less than the thickness of a variable gear, so in variable speed bond is in one of them variable gear the time, this variable gear and variable shaft are circumferentially fixing, all the other variable gears then sky are enclosed within on the variable shaft and can rotate freely.Each gear all is fixed on the transmission shaft in the driving gear set, and one of them transmission gear is meshed with driving gear.In fact, this change-speed box is by circumferentially fixing different variable gear, reaches the purpose of speed change.The operation of the actual speed change of this change-speed box is finished by control mechanism.Governor lever in the variable shaft stretches out housing under the effect of governing spring, withstand on the catch.By stirring handle, the position of control catch just can make governor lever compress or stretches out.Because governor lever links to each other with the keyseat of variable speed bond,, thereby reach the speed change purpose so the flexible of governor lever just can make variable speed bond enter in the different variable gears.

Compared with prior art, shaft transmission in this rickshaw is owing to adopt the principle of gear change, and is rational in infrastructure, good stability; The whole speed changing structure of this change-speed box all is positioned at housing, and is not fragile in the use, long service life; Speed-change process realizes that by the variable speed bond change in location on the variable shaft position of all gears all remains unchanged, and therefore not only be under any state at rickshaw and all can realize speed change, and the process of speed change is steady, and part is not easy to wear.

Concrete structure of the present utility model is provided by following embodiment and accompanying drawing thereof.

Fig. 1 is the schematic cross-section of shaft transmission in this rickshaw.

Fig. 2 is the cutaway view of Fig. 1 along A-A.

Fig. 3 is the scheme drawing at catch place in this change-speed box control mechanism.

Fig. 4 is the scheme drawing at handle place in this change-speed box control mechanism.

As depicted in figs. 1 and 2, this rickshaw axis erection of transmission is at the axis place of ordinary bicycle or three-wheel vehicle, and its housing 1 is cylindric.Driving gear 2, driving gear set 3 and change-gear set 4 all are positioned at housing 1, and chain wheel 11 is positioned at housing 1 outside, and axis 5 passes housing 1, connect with the foot-operated of rickshaw.The bearing of axis 5, transmission shaft 6 and variable shaft 7 all is positioned on the housing 1.In the present embodiment, driving gear set 3 and change-gear set 4 are formed by three gears, make this change-speed box have third speed to regulate.In fact and since arbitrary transmission gear 30 engagements in driving gear 2 and the driving gear set 3 all can, so select different big or small driving gears 2, also adjustable speed.Like this, the producer can just can select proper speed according to different vehicles when producing.

Each transmission gear 30 both can be connected as a single entity in the driving gear set 3, also can be fixed on independently of each other on the transmission shaft 6.In change-gear set 4, each variable gear 40 is separate.Axial trough 75 on the variable shaft 7 is along axis direction, and keyseat 71 integral body in the axial trough 75 are arranged in variable shaft 7, but variable shaft 7 is stretched out on variable speed bond 70 tops in the keyseat 71, and its edge is circular-arc.Between keyseat 71 and the variable speed bond 70 space is arranged, and be provided with retracing spring 72.When variable speed bond 70 is changed on the adjacent variable gear 40 by a variable gear 40, be not on the same straight line because the hub groove 41 of adjacent variable gear 40 is general, so be contracted in the variable shaft 7 under the extruding that variable speed bond 70 can at first be justified in adjacent variable gear 40 with the hub groove of former variable gear 40.Until variable gear 40 go to its hub groove 41 be in variable speed bond 70 over against the position time, variable speed bond 70 can eject under the effect of retracing spring 72, this variable gear 40 is connected with variable shaft 7, and two other variable gear 40 then sky is enclosed within on the variable shaft 7 and can rotates freely.So just finished a speed regulation process.In fact, in order to make variable speed bond 70 energy light and flexible in speed governing, variable speed bond 70 is a disc-shaped structure in the present embodiment, can rotate in speed regulation process, with the power of reducing friction.

As shown in Figure 3 and Figure 4, the control mechanism of this change-speed box mainly comprises handle 9, catch 8 and steel rope 10.The rider limits keyseat 71 and variable speed bond 70 residing positions by the rotation of handle 9 by steel rope 10 control catch 8.In the present embodiment, handle set 90 is fixed on the handle of rickshaw, and handle 9 connects with handle set 90.Owing to have third speed to regulate, the limited bayonet 91 of three dentations arranged on handle set 90.Catch 8 connects with housing 1, and controlling spring 80 is set between the two, by the corner of controlling spring 80 and steel rope 10 common control catch 8.Because there is governing spring 74 governor lever 73 the inners in the variable shaft 7, so governor lever 73 withstands on the catch 8 all the time, and stretches with the rotation of catch 8.Like this,, just can cause moving of variable speed bond 70, reach the speed change purpose as long as pull handle 9.The utility model can be widely used in having higher utility on various types of bicycles and the three-wheel vehicle.

Claims (3)

1, shaft transmission in a kind of rickshaw, be by control mechanism, speed-changing mechanism and housing (1) are formed, the chain wheel of rickshaw (11) is arranged at housing (1) outside, speed-changing mechanism is located in the housing (1), control mechanism comprises the handle (9) that is positioned on the rickshaw handle, catch (8) and the steel rope (10) that is connected handle (9) and catch (8) in housing (1) outside, between housing (1) and the catch (8) controlling spring (80) is set, handle (9) has been located limited bayonet (91), it is characterized in that described speed-changing mechanism is by axis (5), transmission shaft (6), variable shaft (7), be fixed on the driving gear (2) on the axis (5), the change-gear set (4) that is fixed on the driving gear set (3) on the transmission shaft (6) and is axially fixed on the variable shaft (7) is formed, each variable gear (40) of change-gear set (4) is separate, hub groove (41) is all arranged on it, driving gear set (3) and change-gear set (4) have the gear of equal number, and be meshing with each other, driving gear (2) is meshing with each other with one of them transmission gear (30); Variable shaft (7) passes housing, chain wheel (11) is fixed on variable shaft (7) outer end, variable shaft (7) is provided with axial trough (75), keyseat (71) is arranged in the axial trough (75), variable speed bond (70) is arranged on the keyseat (71), be provided with retracing spring (72) between variable speed bond (70) and the keyseat (71), be provided with governing spring (74) between keyseat (71) and the variable shaft (7), keyseat (71) also is connected with governor lever (73), and governor lever (73) stretches out housing (1), contacts with catch (8) in the control mechanism.

2, shaft transmission in the rickshaw according to claim 1 it is characterized in that variable shaft (7) is stretched out on the top of described variable speed bond (70), and its edge is circular-arc.

3, shaft transmission in the rickshaw according to claim 2 is characterized in that described variable speed bond (70) is for discoid.

Images