CN201615154U

CN201615154U - Flywheel of bicycle

Info

Publication number: CN201615154U
Application number: CN201020151591XU
Authority: CN
Inventors: 马祝波
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-03-31
Filing date: 2010-03-31
Publication date: 2010-10-27
Anticipated expiration: 2020-03-31

Abstract

A flywheel of a bicycle comprises a flywheel outer sleeve, an inner core, a ratchet, a flat barrier and a cover, wherein the cover is fixed at one end of the inner core and the flat barrier is arranged at the other end; left and right arc steel ball rolling paths matched with the inner core and the cover are respectively arranged on the inner periphery of the flywheel outer sleeve; steel balls are arranged in the left and right arc steel ball rolling paths; ratchet grooves which can be matched with the ratchet are drawn on the inner ring of the flywheel outer sleeve; a plurality of ratchet slots corresponding to the ratchet grooves of the flywheel outer sleeve are formed on the outer cylindrical surface of the inner core; the inner end of the ratchet is hinged onto one side of the ratchet slots and a spring is mounted between the inner side of the outer end and the other side of the ratchet slots; and the flat barrier and the inner core are formed integrally. As the spring is adopted to support the ratchet, the defects that the spring can deform and be abraded and broken are avoided, long-time stable operation of the flywheel is ensured and the service life of the flywheel is prolonged. As the inner core and the flat barrier are formed integrally, the deviations of axial and radial bounding are small, and the accuracy of the movement of the flywheel is ensured.

Description

A kind of bicycle freewheel

(1) technical field

The utility model relates to the flywheel in a kind of machine driven system, relates in particular to a kind of bicycle freewheel.

(2) background technique

Existing bicycle freewheel is by Case of fly-wheel, in core, ratchet, flat retaining and lid are formed, core is a cylindrical shape in described, the one end is fixed with described lid, the other end is provided with described flat retaining, described Case of fly-wheel is a ring, described Case of fly-wheel be provided with in interior week with described in the left circular arc steel ball raceway that matches of core and be provided with the right circular arc steel ball raceway that matches with described lid, its left side, be provided with steel ball in the right circular arc steel ball raceway, the periphery of described Case of fly-wheel is shaped on a plurality of chain gear along upper punch, draw on the inner ring of described Case of fly-wheel the ratchet groove that can cooperatively interact with described ratchet is arranged, be provided with very heavy spring between ratchet and the ratchet groove, one end of very heavy spring is against in the groove of ratchet, ratchet is strutted, this just structure makes very heavy spring easy deformation, wearing and tearing and fracture, ratchet and ratchet groove are not meshed, the generation fault, work neither be very stable, and flywheel is short working life.In addition, because Case of fly-wheel both ends of the surface and flat retaining and the formed left and right circular arc steel ball raceway of lid, for the axial end arc supports, pasting the closely continuous supporting of ball by the steel ball ball in the left and right circular arc raceway of both ends of the surface rolls, and in core separate with flat retaining, flat retaining easily vertically and move radially, thereby make axial beat and the deviation of beating radially is big, frictional force is big, kinematic accuracy is low.

(3) summary of the invention

There is above-mentioned deficiency in the prior art in order to overcome, the utility model provides a kind of bicycle freewheel simple in structure, easy to use, in its ratchet one end is hinged in the ratchet slot of core, the other end supports by spring, spring is not easy to wear, makes the working life that the working stability of flywheel is reliable, prolonged flywheel; And in core one-body molded with flat retaining, axially and the deviation of beating radially is little, frictional force is little, thereby guaranteed the kinematic accuracy of flywheel.

The technical scheme in the invention for solving the technical problem is: a kind of bicycle freewheel, by Case of fly-wheel, in core, ratchet, flat retaining and lid are formed, core is a cylindrical shape in described, the one end is fixed with described lid, the other end is provided with described flat retaining, described Case of fly-wheel is a ring, described Case of fly-wheel be provided with in interior week with described in the left circular arc steel ball raceway that matches of core and the right circular arc steel ball raceway that matches with described lid, its left side, be provided with steel ball in the right circular arc steel ball raceway, the periphery of described Case of fly-wheel is shaped on a plurality of chain gear along upper punch, draw on the inner ring of described Case of fly-wheel the ratchet groove that can cooperatively interact with described ratchet is arranged, the external cylindrical surface of core is provided with several ratchet slots corresponding with the ratchet groove of described Case of fly-wheel in described, the inner end of described ratchet is articulated in a side of described ratchet slot, between the inboard of outer end and the opposite side of described ratchet slot a spring is housed, described flat retaining and described in core be shaped to one.

Described ratchet and described spring structure are 2～3.Ratchet slot is several, and even distribution of ratchet and spring is arranged in the ratchet slot, and its number is 2～3, can reach concrete stressing conditions as required and set its quantity; And several ratchet slots be evenly distributed on the external cylindrical surface of core, constitute trellis work, can economical with materials.

Further, described lid and described in the end riveted joint of core form, the axial runout of Case of fly-wheel and circular runout deviation are reduced.

Further, described lid and described in be provided with one between the core and adjust packing ring, when lid is riveted with the lining core, play corrective action.

The utility model in use, the Case of fly-wheel forward rotation, the ratchet groove one way engagement of ratchet and Case of fly-wheel, the outer end of ratchet is butted on the minimum point in the ratchet groove under the effect of spring, core and Case of fly-wheel chucking in the realization, thus core rotates together in driving; When the Case of fly-wheel backward rotation, the inclined-plane of the ratchet groove of Case of fly-wheel makes ratchet along each ratchet groove sequential movements, realizes the automatic clutch of Case of fly-wheel and lining core.

The beneficial effects of the utility model are: owing to adopt spring to replace very heavy spring, in the ratchet inner end is hinged in the ratchet slot of core, the outer end is supported by spring, spring only contacts with ratchet, so do not exist because of camber of spring, the drawback of wearing and tearing and fractureing, can guarantee the flywheel long-term stable operation, prolong the working life of flywheel; Because the lining core is one-body molded with flat retaining, and the riveted joint of an end of lid and lining core, thereby there is not axial runout, also significantly reduced circular runout, improved working sensitivity, frictional force obviously reduces, thereby has guaranteed the kinematic accuracy of flywheel.

(4) description of drawings

Fig. 1 is a structural representation of the present utility model.

Fig. 2 be of the present utility model in structural representation during core and Case of fly-wheel chucking.

Fig. 3 be of the present utility model in core structural representation when separating with Case of fly-wheel.

(5) embodiment

Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.

With reference to Fig. 1, a kind of bicycle freewheel, by Case of fly-wheel 1, in core 2, ratchet 3, flat retaining 4 and lid 5 are formed, core 2 is a cylindrical shape in described, the one end is fixed with described lid 5, the other end is provided with described flat retaining 4, described Case of fly-wheel 1 is a ring, described Case of fly-wheel 1 be provided with in interior week with described in the left circular arc steel ball raceway that matches of core 26 and the right circular arc steel ball raceway 7 that matches with described lid 5, its left side, right circular arc steel ball raceway 6, be provided with steel ball 8 in 7, the periphery of described Case of fly-wheel 1 is shaped on a plurality of chain gear 9 along upper punch, draw on the inner ring of described Case of fly-wheel 1 the ratchet groove 10 that can cooperatively interact with described ratchet 3 is arranged, the external cylindrical surface of core 2 is provided with several ratchet slots 11 corresponding with the ratchet groove 10 of described Case of fly-wheel 1 in described, the inner end of described ratchet 3 is articulated in a side of described ratchet slot 11, one spring 12 is housed between the opposite side of the inboard of outer end and described ratchet slot 11, described flat retaining 4 with described in core 2 be shaped to one, described ratchet 3 and described spring 12 structures are 2, described lid 5 with described in the end riveted joint of core 2 form, described lid 5 with described in be provided with an adjustment packing ring 13 between the core 2.

With reference to Fig. 2, Fig. 3, the utility model in use, Case of fly-wheel 1 forward rotation, ratchet groove 10 one way engagement of ratchet 3 and Case of fly-wheel 1, the outer end of ratchet 3 is butted on the minimum point in the ratchet groove 10 under the effect of spring 12, core 2 and Case of fly-wheel 1 chucking in the realization, thus core 2 rotates together in driving; When Case of fly-wheel 1 backward rotation, the inclined-plane of the ratchet groove 10 of Case of fly-wheel 1 makes ratchet 3 along each ratchet groove 10 sequential movements, realizes the automatic clutch of Case of fly-wheel 1 and lining core 2.Because this structure adopts spring 12 to support ratchet 3, does not have the drawback of being out of shape, wearing and tearing and fracture because of spring 12, can guarantee the flywheel long-term stable operation, has prolonged the working life of flywheel; Because lining core 2 and flat retaining 4 are one-body molded, and the riveted joint of an end of lid 5 and lining core 2, thereby do not have axial runout, have also significantly reduced circular runout, have improved working sensitivity, frictional force obviously reduces, thereby has guaranteed the kinematic accuracy of flywheel.

Claims

1. bicycle freewheel, by Case of fly-wheel, in core, ratchet, flat retaining and lid are formed, core is a cylindrical shape in described, the one end is fixed with described lid, the other end is provided with described flat retaining, described Case of fly-wheel is a ring, described Case of fly-wheel be provided with in interior week with described in the left circular arc steel ball raceway that matches of core and the right circular arc steel ball raceway that matches with described lid, its left side, be provided with steel ball in the right circular arc steel ball raceway, the periphery of described Case of fly-wheel is shaped on a plurality of chain gear along upper punch, draw on the inner ring of described Case of fly-wheel the ratchet groove that can cooperatively interact with described ratchet is arranged, it is characterized in that: the external cylindrical surface of core is provided with several ratchet slots corresponding with the ratchet groove of described Case of fly-wheel in described, the inner end of described ratchet is articulated in a side of described ratchet slot, between the inboard of outer end and the opposite side of described ratchet slot a spring is housed, described flat retaining and described in core be shaped to one.

2. according to the described bicycle freewheel of claim 1, it is characterized in that: described ratchet and described spring structure are 2～3.

3. according to the described bicycle freewheel of claim 1, it is characterized in that: described lid and described in the end riveted joint of core form.

4. according to the described bicycle freewheel of claim 3, it is characterized in that: described lid and described in be provided with one between the core and adjust packing ring.