CN208855815U - A kind of bicycle chain wheel structure convenient for machining - Google Patents

Abstract

A kind of bicycle chain wheel structure convenient for machining, it include: the chain wheel rim, chain guard, sprocket wheel dog, sprocket of integral structure, wherein chain cage apertures is machined in the position of negative tooth pros on chain guard, make milling cutter can go deep into chain cage apertures to negative tooth from the setting followed by processing, chain cage apertures keep the negative tooth on bicycle chainwheel easy to process on the basis of and will not reduce the performance that chain guard normally acts on.

Description

A kind of bicycle chain wheel structure convenient for machining

Technical field

The utility model relates to bicycle brake technical field, specially a kind of bicycle chainwheel knot convenient for machining Structure.

Background technique

Bicycle is broadly divided into four classes, and the first kind is civilian vehicle, common use of riding instead of walk；Second class is the very thick mountainous region of tire Vehicle；Third class is called climbing car；There are also the highway cars that one kind is exactly road cycling match, we are usually accustomed to crying its " match Vehicle ".Road cycling is divided into field vehicle and highway car again,

Sprocket wheel is mainly the wheel with cog type whelp, mutually to nibble with the accurate block of pitch on pitch chain ring or cable It closes with passing movement.Bicycle sprocket is mainly the structure that transmitting operation power is engaged with chain, and the gear of traditional sprocket wheel is thick Degree is consistent, and with the development of chain sprocket structure, sprocket wheel is equipped with the different commutating tooth (thick tooth) of thickness, negative tooth (thin tooth), chain and tooth Take turns the size large and small hole corresponding with commutating tooth, negative transverse tooth thickness degree respectively in the pitch chain hole of engagement.There is the design of positive and negative tooth in sprocket wheel Following advantage, first, the thickness of commutating tooth increases, wear resistance is improved, and service life extends；Second, chain and it is spaced just, Negative tooth engagement can make the combination of chain and sprocket wheel more firm, and beat is few, and the noise generated during gear motion is small；Its Three: being engaged between chain and sprocket wheel securely, it is not easy to fall chain.Sprocket wheel is generally divided into no chain bell-type sprocket wheel, has chain bell-type sprocket wheel, by In the limitation of Gearmaking Technology, positive and negative tooth only can reside in no chain bell-type sprocket wheel and can not be applied to have chain bell-type sprocket wheel, Because chain guard can hinder negative tooth close to the processing of chain guard one side.But on the one hand in order to bicycle use process midchain oil not The clothing of bicyclist can be made dirty, on the other hand prevent having the use of chain bell-type sprocket wheel inevitable the case where surprisingly falling chain.

In view of the above technical problems, which proposes a kind of bicycle chain wheel structure convenient for machining, includes: Chain wheel rim, chain guard, the sprocket wheel dog, sprocket of integral structure are wherein machined with chain cage apertures in the position of negative tooth pros on chain guard, Make milling cutter that can go deep into chain cage apertures makes the negative tooth on bicycle chainwheel be easy to add in negative tooth from the setting followed by processing, chain cage apertures The performance that chain guard normally acts on will not be reduced on the basis of work again.

Summary of the invention

The present invention provides a kind of bicycle chain wheel structure convenient for machining, by tooth 42 negative on chain guard 2 just after Square machining chain cage apertures 21 makes milling cutter that can go deep into chain cage apertures 21 to negative tooth 42 followed by processing, and the setting of chain cage apertures 21 makes certainly The negative tooth 42 driven a vehicle on sprocket wheel is easy to process, improves the service performance with chain bell-type sprocket wheel.

A kind of bicycle chain wheel structure convenient for machining, include: integral structure chain wheel rim 1, chain guard 2, sprocket wheel it is convex Pawl 3, sprocket 4；The interior circle of chain wheel rim 1 be equipped with the 5 sprocket wheel dogs 3 extended towards center of circle direction and 5 sprocket wheel dogs 3 around The center of circle is angularly distributed, and is machined with mounting hole on each sprocket wheel dog 3；The outer circle thickness face of chain wheel rim 1 is equipped with sprocket wheel Tooth 4 and sprocket 4 include commutating tooth 41, negative tooth 42, and the outer circle back plate face of chain wheel rim 1 is equipped with chain guard 2；The circumferencial direction of chain guard 2 It is machined with the mid-length position that irregularly the chain cage apertures 21 of ellipse long shape and negative tooth 42 are located at chain cage apertures 21；Commutating tooth 41 is located at two The front of connecting bridge 22 between a adjacent chain cage apertures 21；The arc sections of tooth paddy 43 between negative tooth 42 commutating tooth 41 adjacent with left and right Divide and is fully located in chain cage apertures 21 in the projection on rear end chain guard 2；

Commutating tooth 41, negative tooth 42 on 1 circumferencial direction of chain wheel rim are alternately separated by setting, and the thickness of commutating tooth 41 is greater than negative tooth 42 Overall thickness.

In process, the front of lathe accessary sprocket wheel processes the position of sprocket to sprocket in bicycle chainwheel At the thickness of commutating tooth 41, carrying out thinning operation followed by 41 front-back of commutating tooth that will be located on negative 42 position of tooth adds negative tooth 42 Work molding；The thinned operation in negative 42 front of tooth is easier to operate in the prior art, but subsequent thinning operation is due to chain The blocking of cover 2 cannot achieve；The chain cage apertures 21 of the negative tooth 42 of the face processed on chain guard 2 involved in the utility model patent Negative tooth 42 is processed from the back side by chain cage apertures 21 for milling cutter, and processing technology is simply easily realized, chain bell-type chain will not have been increased The processing cost of wheel.

Preferably, the height of the bicycle chain wheel structure convenient for machining, negative tooth 42 is higher than the upper of chain cage apertures 21 Hold cambered surface.After chain is fixed on the positive and negative tooth being alternately separated by, it is ensured that the chain positioned at negative 42 part of tooth is located at chain cage apertures The inner side of 21 tops and just stopped by chain guard 2, user's clothing is made dirty by chain cage apertures 21 to avoid the greasy dirt on chain Object guarantees that chain cage apertures 21 will not reduce the performance of 2 mass action of chain guard on the basis of facilitating negative tooth 42 to process.

Preferably, the bicycle chain wheel structure convenient for machining, the chamfer radius of tooth paddy 43 are R1, chain cage apertures 21 The chamfer radius at lower camber side both ends is R2, wherein R1 < R2.Under the premise of R1 < R2 can guarantee that the area of chain cage apertures 21 is small as far as possible The processing for completing negative tooth 42 is further ensured that the existing effect of chain guard 2 itself is not weakened.

Preferably, the bicycle chain wheel structure convenient for machining, R2-R1=1.5~2.5mm.

Detailed description of the invention:

Specific embodiment is further described with reference to the accompanying drawing, in which:

Fig. 1 be the utility model relates to convenient for machining bicycle chain wheel structure front view；

Fig. 2 be the utility model relates to convenient for machining bicycle chain wheel structure rearview；

It is as follows to number corresponding specific structure:

Chain wheel rim 1, chain guard 2, chain cage apertures 21, connecting bridge 22, sprocket wheel dog 3, sprocket 4, commutating tooth 41, negative tooth 42, tooth paddy 43；

The following detailed description will be further explained with reference to the above drawings the utility model.

Specific embodiment

Case 1 is embodied:

A kind of bicycle chain wheel structure convenient for machining, include: integral structure chain wheel rim 1, chain guard 2, sprocket wheel it is convex Pawl 3, sprocket 4；The interior circle of chain wheel rim 1 be equipped with the 5 sprocket wheel dogs 3 extended towards center of circle direction and 5 sprocket wheel dogs 3 around The center of circle is angularly distributed, and is machined with mounting hole on each sprocket wheel dog 3；The outer circle thickness face of chain wheel rim 1 is equipped with sprocket wheel Tooth 4 and sprocket 4 include commutating tooth 41, negative tooth 42, and the outer circle back plate face of chain wheel rim 1 is equipped with chain guard 2；The circumferencial direction of chain guard 2 It is machined with the mid-length position that irregularly the chain cage apertures 21 of ellipse long shape and negative tooth 42 are located at chain cage apertures 21；Commutating tooth 41 is located at two The front of connecting bridge 22 between a adjacent chain cage apertures 21；The arc sections of tooth paddy 43 between negative tooth 42 commutating tooth 41 adjacent with left and right Divide and is fully located in chain cage apertures 21 in the projection on rear end chain guard 2；Commutating tooth 41, negative tooth 42 on 1 circumferencial direction of chain wheel rim replace It is separated by setting, the thickness of commutating tooth 41 is greater than the overall thickness of negative tooth 42.

Further, the height of negative tooth 42 is higher than the upper end cambered surface of chain cage apertures 21；The chamfer radius of tooth paddy 43 is R1, chain guard The chamfer radius at 21 lower camber side both ends of hole is R2, wherein R1 < R2,

Preferably, R2-R1=1.6mm.

The dead astern machining chain cage apertures that chain sprocket structure involved in this specific implementation case passes through tooth 42 negative on chain guard 2 21, making milling cutter that can go deep into chain cage apertures 21 makes on bicycle chainwheel negative tooth 42 from the setting followed by processing, chain cage apertures 21 It ensure that the effect propety of chain guard on the basis of negative tooth 42 is easy to process.Case 2 is embodied:

A kind of bicycle chain wheel structure convenient for machining, include: integral structure chain wheel rim 1, chain guard 2, sprocket wheel it is convex Pawl 3, sprocket 4；The interior circle of chain wheel rim 1 be equipped with the 5 sprocket wheel dogs 3 extended towards center of circle direction and 5 sprocket wheel dogs 3 around The center of circle is angularly distributed, and is machined with mounting hole on each sprocket wheel dog 3；The outer circle thickness face of chain wheel rim 1 is equipped with sprocket wheel Tooth 4 and sprocket 4 include commutating tooth 41, negative tooth 42, and the outer circle back plate face of chain wheel rim 1 is equipped with chain guard 2；The circumferencial direction of chain guard 2 It is machined with the mid-length position that irregularly the chain cage apertures 21 of ellipse long shape and negative tooth 42 are located at chain cage apertures 21；Commutating tooth 41 is located at two The front of connecting bridge 22 between a adjacent chain cage apertures 21；The arc sections of tooth paddy 43 between negative tooth 42 commutating tooth 41 adjacent with left and right Divide and is fully located in chain cage apertures 21 in the projection on rear end chain guard 2；Commutating tooth 41, negative tooth 42 on 1 circumferencial direction of chain wheel rim replace It is separated by setting, the thickness of commutating tooth 41 is greater than the overall thickness of negative tooth 42.

Further, the height of negative tooth 42 is higher than the upper end cambered surface of chain cage apertures 21；The chamfer radius of tooth paddy 43 is R1, chain guard The chamfer radius at 21 lower camber side both ends of hole is R2, wherein R1 < R2,

Preferably, R2-R1=2mm.

The dead astern machining chain cage apertures that chain sprocket structure involved in this specific implementation case passes through tooth 42 negative on chain guard 2 21, making milling cutter that can go deep into chain cage apertures 21 makes on bicycle chainwheel negative tooth 42 from the setting followed by processing, chain cage apertures 21 It ensure that the effect propety of chain guard on the basis of negative tooth 42 is easy to process.

Above-described embodiments merely represent several embodiments of the utility model, the description thereof is more specific and detailed, But it should not be understood as limiting the scope of the patent of the utility model.It should be pointed out that for the common of this field For technical staff, without departing from the concept of the premise utility, various modifications and improvements can be made, these all belong to In the protection scope of the utility model.Therefore, the scope of protection shall be subject to the appended claims for the utility model patent.

Claims (4)

1. a kind of bicycle chain wheel structure convenient for machining, comprising: chain wheel rim, chain guard, the sprocket wheel dog, chain of integral structure The gear teeth；The interior circle of chain wheel rim is equipped with the 5 sprocket wheel dogs extended towards center of circle direction and 5 sprocket wheel dogs around the center of circle angularly It is distributed, is machined with mounting hole on each sprocket wheel dog；The outer circle thickness face of chain wheel rim is equipped with sprocket and sprocket packet Commutating tooth, negative tooth are included, the commutating tooth, negative tooth on chain wheel rim circumferencial direction are alternately separated by setting, and the thickness of commutating tooth is greater than the total thickness of negative tooth Degree, it is characterised in that: the outer circle back plate face of chain wheel rim is equipped with chain guard, and the circumferencial direction of chain guard is machined with the chain guard of ellipse long shape Hole and negative tooth position is in the mid-length position of chain cage apertures；Commutating tooth is located at the front of connecting bridge between two adjacent chain cage apertures；It is negative The circular arc portion of tooth paddy between tooth commutating tooth adjacent with left and right is fully located in chain cage apertures in the projection on the chain guard of rear end.

2. as described in claim 1 convenient for the bicycle chain wheel structure of machining, its feature is as follows: the height of negative tooth is higher than chain The upper end cambered surface of cage apertures.

3. as described in claim 1 convenient for the bicycle chain wheel structure of machining, it is characterised in that: the chamfer radius of tooth paddy is R1, the chamfer radius at chain cage apertures lower camber side both ends are R2, wherein R1 < R2.

4. as claimed in claim 3 convenient for the bicycle chain wheel structure of machining, it is characterised in that: R2-R1=1.5~ 2.5mm。