CN87214197U - Bicycle free wheel - Google Patents

Abstract

The utility model discloses a bicycle flywheel, whose outer sleeve and core are all cylinder shape components provided with flange. A jack is arranged on the flange of the end of the core, and the oscillating axis of the jack is vertical to the axis of the flywheel. The flywheel of the structure need not preforming roll forging, and the performance is same as the existing flywheel. The manufacture method is that the outer sleeve, the core and a lead screw are stamping into blanks by a sheet steel, then are metal cutting a little into finished product.

Description

Bicycle free wheel

The invention relates to a kind of flywheel of bicycle use, the blank of its overcoat and fuse---the agent structure that is overcoat and fuse is the manufacturing of available sheet metal cold punching technology, is the invention of bicycle freewheel.

Existing flywheel is made up of overcoat, fuse, flat shelves, silk shelves, packing ring, very heavy, very heavy spring and steel ball.Its shape be the flywheel sold on, the market symmetrical about the flywheel tooth be exactly this structure, overcoat and fuse be two major parts of flywheel.The structure of overcoat is symmetrical about the flywheel tooth, and respectively there is a steel ball raceway tooth both sides within it, and there is a bigger flange at the middle part of fuse.The overcoat of this structure and fuse all are material in the mill with the round steel, with Forging Technology be shaped their agent structure, cut into qualified part again.At present domesticly all make overcoat and fuse blank with thermal forging technology, its shortcoming is a material unit consumption height, and stock utilization is low, generally about 26-30%, and energy consumption height, complex process, reject rate height.Generally make blank with cold-forging technique abroad, stock utilization increases, but needs expensive large-tonnage cold forging equipment, and the cold forging die complex structure, processing difficulties, and the life-span is lower, and technology is more complicated also.

The flywheel that the purpose of this invention is to provide general new structure, the overcoat of this flywheel and the blank of fuse can be made with the plate cold punching technology.

The present invention constitutes like this: overcoat, fuse, silk shelves, two very heavy, two very heavy springs, several packing rings, two dust covers and several steel balls, fuse are the flanged cylindrical member of an end.Flange is connected with fillet with drum outer wall, as the steel ball raceway.Flangeless end at tube has one section outside thread, is used for twisting the silk shelves, has two can hold very heavy very heavy groove on the flange inner end face, and " protruding " font through hole is all arranged in the bottom of each groove one end.Very heavy is " L " shape.Very heavy two sides of tail respectively has a sulculus, very heavy afterbody is inserted the broad place of " protruding " font through hole, and then very heavy afterbody is pushed in the narrow groove of " protruding " font through hole, makes the very heavy afterbody can not axial float.Put into very heavy spring in very heavy groove, the two ends of very heavy spring withstand on respectively on the sidewall and very heavy afterbody of very heavy groove, can prevent that so very heavy afterbody from skidding off narrow groove.Overcoat is the very shallow flanged cylindrical member of an end, and shape is similar to " plate ".The outer tooth that was used in one week with chain engages is arranged on the cylindrical of flange.On flange, outer tooth inboard is a uniform aperture of a week, the very heavy formation indexing mechanism on these apertures and the fuse.The tube inwall was connected with circular arc with the tube end, constituted the steel ball raceway.There is a round tube hole at tube center, the end, and its slightly larger in diameter is in the external diameter of the tube of fuse.Overcoat is through on the tube of fuse, and the steel ball of between the steel ball raceway of fuse and overcoat, packing into.The silk shelves are ring parts, and an annular steel ball raceway is arranged at the middle part of silk shelves end face.The silk shelves are screwed on the fuse, and between the end face of silk shelves and overcoat, load onto steel ball.Do not have thrust steel ball raceway on the overcoat end face, steel ball only keeps by the raceway on the silk shelves.The gap of flywheel is regulated by the packing ring between increase and decrease silk shelves and fuse.Outermost at flywheel is two dust covers, is contained in respectively on the flange of silk shelves and fuse, and wherein on the fuse flange has two apertures in case dust cover and very heavy interference on preventing dust.

The present invention is performed such work; the steel ball that is contained between overcoat and the fuse plays radial thrust bearing to overcoat; so the steel ball between overcoat and the silk shelves plays a part thrust-bearing when overcoat rotates with respect to fuse to overcoat, very sliding fast, and a definite position is arranged.In use step bicycle crank forward, the overcoat of flywheel rotates forward with respect to fuse, and when the some alignings in all apertures on the overcoat flange were very heavy, very heavy head takeoff under the promotion of very heavy spring, enter aperture, and push away fuse together rotation forward with it.When stopping treadmill or anti-when stepping on crank, overcoat rotates backward with respect to fuse, the disengagement that contacts of at this moment very heavy head and aperture frame, simultaneously the opposite side of aperture is pressed into very heavy groove with very heavy, enter an adjacent aperture then again ... very heavy like this again and again around axis swing, this axis is perpendicular to the flywheel axis.Thereby realize that overcoat can only turn round with respect to fuse, and opposite relative rotation can not be arranged.

The example structure that will describe in detail below the present invention adopts.Simple in structure, the material unit consumption reduces by 50%, is 340 grams, and stock utilization is 56%, and operation can reduce by 50%, per ten thousand flywheels can save 4.5 tons in raw coal, and equipment needed thereby, mould are simple.

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

Fig. 1 is a half sectional view of the present invention.

Fig. 2 is the partial sectional view after the present invention removes dust cover 11.

The local A-A of amplification sectional view when Fig. 3 is the engagement of very heavy and overcoat.

Fig. 4 is the right elevation of fuse 3.

Very heavy 1 is L-shaped.Its structure as shown in Figure 3.Very heavyly form by head 16 and afterbody 17 two-part.Dashing respectively in afterbody 17 both sides has two sulculuses 18, make the width of the root of afterbody 17 be slightly smaller than the narrower part 22 of " protruding " font groove 20 on the fuse, the width of afterbody 17 is greater than narrow groove 22, less than sipes 21, behind the very heavy so very heavy groove of packing into, very heavy afterbody 17 just can not flywheel axially on produce bigger play.

Very heavy spring 2 is bending with book spring steel plate or phosphorus bronze sheet.Its width slightly is narrower than very heavy groove 19, and its shape as shown in Figure 3.The length of very heavy spring skids off narrow groove 22 with the root 18 that can prevent very heavy afterbody and is as the criterion.

Fuse 3 is that the steel plate with 3 millimeters thick is drawn into flanged cylindrical member, and makes flange root fillet radius equal or be slightly larger than the radius of steel ball 4, forms the raceway of steel ball 4.The end of cylindrical member, all washed out.Mill two very heavy grooves 19 on flange, and dash one " protruding " font through hole 20 in a bottom portion of groove 19, it is made up of the hole 21 of broad and narrower hole 22.Its shape is as shown in Fig. 3, Fig. 4.On the flange of fuse, bore two fastening flywheels with auxiliary holes 15, at last at fuse get on the bus out shoulder 23, outside thread 24 and internal thread 25.

The structure of overcoat 5 is as shown in Fig. 1 and Fig. 2.It is that steel plate pull and stretch with 3 millimeters thick becomes the degree of depth to be slightly less than flanged cylindrical member of steel ball 4 diameters.Tube inwall and the fillet radius of tube at the end equal or are slightly larger than the radius of steel ball 4, as the raceway of steel ball 4.Dash a macropore at the bottom of tube, its diameter is a bit larger tham the external diameter of the tube of fuse 3.Tooth 13 and all little fan shaped boreholes 14 outside the flange upper punch has a week, as shown in Figure 2.At overcoat end face loose 1 millimeter the step 12 of getting on the bus, it and dust cover 11 hang together, and play dustproof effect, as shown in Figure 1.

Packing ring 6 is to be washed into the different galvanized iron of several thin and thicks.During assembling, at shoulder 23 and 9 packing rings of putting into suitable quantity and kind of silk shelves of fuse 3, so that flywheel obtains qualified movement clearance.

Steel plate with 3 millimeters thick dashes a section blank that goes out the silk shelves 9 of ring-type, and car goes out screw thread in the hole, lining.At silk shelves end face car one annular groove, as the raceway of thrust steel ball 7.Bore the auxiliary hole 8 of two fastening silk shelves usefulness at the another side of silk shelves.

Dust cover 10,11 all forms with plastics.Has effect dustproof, antirust and that decorate.Two through holes 26 are arranged on the dust cover 11, in case dust cover and very heavy interference, as shown in Figure 3.

Afterbody 17 with very heavy 1 inserts in the hole 21 on the fuses 3, then with very heavy to pusher, very heavy upper groove 18 is slipped in the hole 22, very heavy put into very heavy groove 19 after, with very heavy spring 2 be placed on very heavy 1 below.Flange root at fuse 3 is loaded onto steel ball 4.Overcoat 5 is through on the tube of fuse.On the shoulder 23 of fuse 3, load onto several packing rings 6, silk shelves 9 are screwed on the fuse, and the steel ball 7 of between silk shelves and overcoat, packing into.At last respectively in fitted with dust caps 11 and 10 on the flange of fuse 3 and on the silk shelves 9.

Claims (4)

1, a kind of bicycle freewheel of forming by overcoat, fuse, silk shelves, very heavy, very heavy spring, packing ring, steel ball, it is characterized in that: overcoat 5 is the flanged cylindrical member of an end, fuse 3 is the flanged cylindrical member of an end, entad thrust steel ball 4 and all thrust steel balls 7 of one week is housed in the flywheel, very heavy 1 when swing around axis normal what flywheel axis, a dust cover 10 and 11 respectively are housed on the flange of silk shelves 9 and fuse 3.

2, flywheel according to claim 1 is characterized in that the radius of whats such as the inwall of the tube of overcoat 5 is connected with circular arc at an end with tube, radius of arc or bigger what steel ball 4, and tin the diameter of the little what steel ball 4 of depth dimensions.

3, flywheel according to claim 1 is characterized in that having on the flange inner end face of fuse 3 and can hold very heavy 1 very heavy groove 19, and " protruding " font through hole 20 was arranged on the end of very heavy groove 19.

4, flywheel according to claim 1 is characterized in that in the both sides of very heavy 1 afterbody 17 groove 18 being arranged respectively.

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