CN203410592U

CN203410592U - Front fluted discspeed changer of bicycle

Info

Publication number: CN203410592U
Application number: CN201320140147.1U
Authority: CN
Inventors: 刘孟武
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-03-26
Filing date: 2013-03-26
Publication date: 2014-01-29
Anticipated expiration: 2023-03-26

Abstract

The utility model relates to a front fluted discspeed changer of a bicycle. The front fluted discspeed changer is characterized by comprising a crankshaft, an outer clutch disc, an inner clutch disc, a middle clutch disc, a planetary gear set, a control rod, a shifting member and a locating mechanism, wherein the crankshaft is provided with a shaft hole which penetrates through the two ends of the crankshaft and an accommodation hole whichradially penetrates through; the outer clutch disc is pivoted on the crankshaft and can rotate freely; the inner clutch disc is pivoted on the crankshaft and can rotate freely; the middle clutch disc is arranged in the crankshaftin a penetrating manner, accommodated between the inner and outer clutch discs, can shift left and right in an axial direction of the crankshaft so as to be respectively connected with or separated from the inner and outer clutch discs, and is driven to rotate through the crankshaft; the planetary gear set is used for connecting with and driving the inner and outer clutch discs; the control rod is arranged the shaft hole of the crankshafta penetrating manner and can shift left and right in the axial direction of the crankshaft; the shifting member is accommodated in the accommodation hole of the crankshaft, is fixedly connected with the middle clutch disc, can be driven by the control rod, and is linked with the middle clutch disc to shift left and right; and the locating mechanism is arranged between the crankshaft and the control rod, so as to locate the control rod.

Description

Fluted disc change-speed box before bicycle

Technical field

The transmission system of the utility model and bicycle is relevant, refers to especially the change-speed box of the front fluted disc of a kind of bicycle.

Background technology

As shown in US Patent No. 5303942 and No. 5609071, it is the change-speed box of fluted disc before a kind of bicycle, disclose a kind of device that utilizes pinion gear mechanism to reach speed change, this kind of device is to carry out clutch discs in sway one with a control stalk being contained in bicycle crank axle, with control in this clutch discs and an outer clutch discs or with an interior clutch discs engagement, inside and outside two clutch discs with a pinion gear group connection for transmission, reach the object of speed change with this again.Before above-mentioned patent, the control stalk of case does not have suitable location, and the engaging structure of middle clutch discs and inside and outside clutch discs does not have the design of pre-anticreep tooth yet, and when bicycle tilts, this change-speed box may take off tooth inefficacy.And the front fluted disc of above-mentioned patent is to be integral with pinion gear group is affixed, whole converter speed ratio can only be dependent on this pinion gear group, in the time will changing converter speed ratio, can only redesign this pinion gear group, and inconvenience is Expenses Cost again.

Summary of the invention

For the problems referred to above, main purpose of the present utility model is to provide a kind of bicycle front gear change-speed box, and it can prevent that change-speed box from taking off tooth.

Another object of the present utility model is to provide a kind of bicycle front gear change-speed box, and it can simply change converter speed ratio.

For achieving the above object, fluted disc change-speed box before a kind of bicycle provided by the utility model, is characterized in that including: a crank shaft, there is an axis hole that runs through two ends, and an accommodating hole running through radially; One outer clutch discs, is hubbed on described crank shaft, can freely rotate; One interior clutch discs, is hubbed on described crank shaft, can freely rotate; Clutch discs in one, is located on described crank shaft, is contained between described inside and outside clutch discs, can engage with described inside and outside clutch discs respectively along the axial left and right sidesing shifting of described crank shaft or separated, and be subject to the drive of described crank shaft and rotate; One pinion gear group, for inside and outside clutch discs described in connection transmission; One control stalk, is located in the axis hole of described crank shaft, can be along the axial left and right sidesing shifting of described crank shaft; One displacement member, is contained in the accommodating hole of described crank shaft, affixed with described middle clutch discs, and can be driven by described control stalk, and clutch discs left and right sidesing shifting in described in interlock; One detent mechanism, is located between described crank shaft and described control stalk, to locate described control stalk.

In above-mentioned the technical solution of the utility model, described detent mechanism includes: two positioning grooves that are arranged with on described control stalk, and at least one group of locations, be located in the radially default groove of described crank shaft, described group of locations includes an elastic component and a steel ball, and described steel ball can fasten one of them at described two positioning grooves.

The both sides of described middle clutch discs are respectively provided with an engaging piece, the contact surface of described inside and outside clutch discs and described middle clutch discs is also respectively provided with an engaging piece, can intermesh with the engaging piece of described middle clutch discs, described in each, engaging piece is ring flute profile, respectively have a plurality of circular arc double wedges, described in each, double wedge is all slightly circular arc, and the normal of the outer rim boundary line of described double wedge and the card of described middle clutch discs has the angle of a setting, described angle is between 2 degree to 10 degree, with better between 3 degree to 6 degree.

Described crank shaft is hubbed in a tube-like envelope, and described pinion gear group includes: a sun wheel, is fixed on described shell; At least two satellite gears, are fixed in described interior clutch discs with an axle respectively, and can be around its anchor shaft rotation, and can revolve round the sun along with the rotation of described interior clutch discs, described satellite gear and the engagement of described sun wheel; One universe wheel, is fixed in described outer clutch discs, with described satellite gear engagement, can be driven and drive described outer clutch discs to rotate by described satellite gear.

Described outer clutch discs is provided with a connecting bracket, affixed for a fluted disc, forms the front fluted disc of bicycle.

Described crank shaft is provided with an external tooth, and described middle clutch discs is provided with an internal tooth, can mesh with the external tooth of described crank shaft.

The arranged on left and right sides of described displacement member is respectively provided with a spring, and one end of left side spring props up described control stalk, and the other end props up described displacement member, and one end of right side spring props up described displacement member, and the other end is located with a C shape clasp.

Adopt technique scheme, the utility model can prevent that change-speed box from taking off tooth, and can change easily front fluted disc, reaches the object of quick change converter speed ratio.

Accompanying drawing explanation

Fig. 1 is the combination stereogram of the utility model embodiment;

Fig. 2 is the exploded perspective view of the utility model embodiment;

Fig. 3 is the cutaway view along 3-3 hatching lines in Fig. 1, clutch discs and the engagement of interior clutch discs in demonstration;

Fig. 4 is generally same as Fig. 3, clutch discs and the engagement of outer clutch discs in demonstration;

Fig. 5 is the front elevation of middle clutch discs;

Fig. 6 is the cutaway view of middle clutch discs.

The specific embodiment

In order to describe structure of the present utility model, Characteristic in detail, now for an embodiment and coordinate accompanying drawing to be described as follows.

As shown in Fig. 1～Fig. 6, be fluted disc change-speed box before a kind of bicycle of the utility model one embodiment, include:

One crank shaft 10, has an axis hole 11 that runs through two ends, and an accommodating hole 12 running through radially.

One outer clutch discs 20, is hubbed on crank shaft 10, free to rotate, and outer clutch discs 20 is provided with a connecting bracket 25, affixed for a fluted disc 26, forms the front fluted disc 90 of bicycle.

One interior clutch discs 30, is hubbed on crank shaft 10, free to rotate.

In one, clutch discs 40, be located on crank shaft 10, be contained between inside and outside

clutch discs

20,30, can engage with inside and outside

clutch discs

20,30 respectively along the axial left and right sidesing shifting of crank shaft 10 or separated, and be subject to the drive of crank shaft 10 and rotate, the middle clutch discs 40 of the present embodiment is external tooth 16 engagements with crank shaft 10 by its internal tooth 46.Wherein the both sides of middle clutch discs 40 are respectively provided with an

engaging piece

41, 42, in,

outer clutch discs

20, 30 are also respectively provided with an engaging piece 21 with the contact surface of middle clutch discs 40, 31, can with the engaging piece 41 of

middle clutch discs

40, 42 intermesh, each

engaging piece

21, 31, 41, 42 are ring flute profile, respectively there are a plurality of circular arc double wedges, as Fig. 5, shown in Fig. 6 (for convenience of description, in only lifting, clutch discs 40 explains), the normal 45 of the outer rim boundary line 44 of each double wedge 43 and the card of middle clutch discs 40 has the angle A of a setting, angle A is between 2 degree to 10 degree, with better between 3 degree to 6 degree, the present embodiment is 5 degree.

One pinion gear group 50, uses and is connected and the inside and outside

clutch discs

20,30 of transmission, and wherein crank shaft 10 is hubbed in a tube-like envelope 15, and pinion gear group 50 includes: a sun wheel 51, is fixed on shell 15; At least two satellite gear 52(the present embodiment have four), each is fixed in interior clutch discs 30 with an axle 53, and can be around its anchor shaft 53 rotations, and can revolve round the sun along with the rotation of interior clutch discs 30, satellite gear 52 and sun wheel 51 engagements; One universe wheel 54, is fixed in outer clutch discs 20, with satellite gear 52 engagements, can be subject to the driving of satellite gear 52 and drives outer clutch discs 20 to rotate.

One control stalk 60, is located in the axis hole 11 of crank shaft 10, can be along the axial left and right sidesing shifting of crank shaft 10, and the two ends of control stalk 60 protrude out outside crank shaft 10, respectively establish one

end cover

61,62, move control stalk 60 and make its displacement, as shown in Figure 3, Figure 4 for playing for heel.

One displacement member 70, be contained in the accommodating hole 12 of crank shaft 10, affixed with middle clutch discs 40, and drive that can controlled bar 60, and clutch discs 40 left and right sidesing shiftings in interlock, the present embodiment is on a left side for displacement member 70, right both sides are respectively provided with a

spring

71, 72, in figure, one end of left side spring 72 props up control stalk 60, its other end props up displacement member 70, one end of right side spring 71 props up displacement member 70, the other end is with C shape clasp 73 location, make thus displacement member 70 be shifted along with control stalk 60, and there is appropriate elasticity, make clutch discs 40 with in, outer two clutch discs 20, during 30 engagement, there is buffering elasticity.

One detent mechanism 80, be located between crank shaft 10 and control stalk 60, for positioning control bar 60, wherein detent mechanism 80 includes: two

positioning grooves

81,82 that are arranged with on control stalk 60, groove, and at least one group of locations 83 ringwise, is located in the radially default groove 13 of crank shaft 10 (the present embodiment is two groups), this group locations 83 includes an elastic component 84 and a steel ball 85, and steel ball 85 can fasten one of them at two

positioning grooves

81,82.

As shown in Figure 3, in figure, the end on right side cover 61 thruster of being turned left moves, make control stalk 60 drive in displacement member 70 interlocks the clutch discs 40 side displacement of turning left, and mesh with interior clutch discs 30, now steel ball 85 blocks in the positioning groove 81 on right side in the drawings, makes control stalk 60 location, and during treadled cycle, crank shaft 10 will drive interior clutch discs 30 rotations, and drive universe wheel 54 to rotate by satellite gear 52, before indirectly driving, fluted disc 90 rotates.

As shown in Figure 4, when user plays the end that moves in figure left side and overlaps 62 with heel, control stalk 60 drives in displacement member 70 interlocks clutch discs 40 displacement of turning right, and mesh with outer clutch discs 20, now steel ball 85 is stuck in the positioning groove 82 in left side, and during treadled cycle, crank shaft 10 will directly drive front fluted disc 90 to rotate.

Front fluted disc 90 is to form on a connecting bracket 25 with fluted disc 26 lockings, therefore only needs to change fluted disc 26, and convertible converter speed ratio, very convenient in operation.

Claims

1. a fluted disc change-speed box before bicycle, is characterized in that including:

One crank shaft, has an axis hole that runs through two ends, and an accommodating hole running through radially;

One outer clutch discs, is hubbed on described crank shaft, can freely rotate;

One interior clutch discs, is hubbed on described crank shaft, can freely rotate;

Clutch discs in one, is located on described crank shaft, is contained between described inside and outside clutch discs, can engage with described inside and outside clutch discs respectively along the axial left and right sidesing shifting of described crank shaft or separated, and be subject to the drive of described crank shaft and rotate;

One pinion gear group, for inside and outside clutch discs described in connection transmission;

One control stalk, is located in the axis hole of described crank shaft, can be along the axial left and right sidesing shifting of described crank shaft;

One displacement member, is contained in the accommodating hole of described crank shaft, affixed with described middle clutch discs, and can be driven by described control stalk, and clutch discs left and right sidesing shifting in described in interlock;

One detent mechanism, is located between described crank shaft and described control stalk, to locate described control stalk.

2. fluted disc change-speed box before bicycle as claimed in claim 1, it is characterized in that: described detent mechanism includes: two positioning grooves that are arranged with on described control stalk, and at least one group of locations, be located in the radially default groove of described crank shaft, described group of locations includes an elastic component and a steel ball, and described steel ball can fasten one of them at described two positioning grooves.

3. fluted disc change-speed box before bicycle as claimed in claim 1, it is characterized in that: the both sides of described middle clutch discs are respectively provided with an engaging piece, the contact surface of described inside and outside clutch discs and described middle clutch discs is also respectively provided with an engaging piece, can intermesh with the engaging piece of described middle clutch discs, described in each, engaging piece is ring flute profile, respectively there are a plurality of circular arc double wedges, described in each, double wedge is all slightly circular arc, the normal of the outer rim boundary line of described double wedge and the card of described middle clutch discs has the angle of a setting, and described angle is between 2 degree to 10 degree.

4. fluted disc change-speed box before bicycle as claimed in claim 3, is characterized in that: described angle is between 3 degree to 6 degree.

5. fluted disc change-speed box before bicycle as claimed in claim 1, is characterized in that: described crank shaft is hubbed in a tube-like envelope, and described pinion gear group includes: a sun wheel, is fixed on described shell; At least two satellite gears, are fixed in described interior clutch discs with an axle respectively, and can be around its anchor shaft rotation, and can revolve round the sun along with the rotation of described interior clutch discs, described satellite gear and the engagement of described sun wheel; One universe wheel, is fixed in described outer clutch discs, with described satellite gear engagement, can be driven and drive described outer clutch discs to rotate by described satellite gear.

6. fluted disc change-speed box before bicycle as claimed in claim 1, is characterized in that: described outer clutch discs is provided with a connecting bracket, affixed for a fluted disc, forms the front fluted disc of bicycle.

7. fluted disc change-speed box before bicycle as claimed in claim 1, is characterized in that: described crank shaft is provided with an external tooth, and described middle clutch discs is provided with an internal tooth, can mesh with the external tooth of described crank shaft.

8. fluted disc change-speed box before bicycle as claimed in claim 1, it is characterized in that: the arranged on left and right sides of described displacement member is respectively provided with a spring, one end of left side spring props up described control stalk, the other end props up described displacement member, one end of right side spring props up described displacement member, and the other end is located with a C shape clasp.