CN203142957U

CN203142957U - Crank arm

Info

Publication number: CN203142957U
Application number: CN 201320065879
Authority: CN
Inventors: 珊德罗·费尔特兰
Original assignee: Tien Hsin Industries Co Ltd
Current assignee: Tien Hsin Industries Co Ltd
Priority date: 2013-02-05
Filing date: 2013-02-05
Publication date: 2013-08-21
Anticipated expiration: 2023-02-05

Abstract

The utility model discloses a crank arm, which comprises a male connector and a female connector for butt joint with the male connector, wherein the male connector is provided with a first wall surface, the two ends of the first wall surface are provided with a first pin joint end and a first driving end, the first pin joint end is penetrated with a first shaft hole, the first wall surface is provided with a butt joint convex wall, and the wall surface of the butt joint convex wall is a concave-convex surface; the female connecting piece is provided with a second wall surface opposite to the first wall surface, a second pin joint end and a second driving end are respectively arranged at two ends of the second wall surface, a second shaft hole is arranged on the second wall surface and is in butt joint with the first shaft hole, and a limiting groove is embedded with the butt joint convex wall. The utility model discloses a crank arm has increased area of contact and the shear resistance function of this public, female union piece, light in weight, equipment reach fast enough intensity.

Description

Crank arm

Technical field

The utility model relates to a kind of crank arm, particularly a kind of bicycle crank arm with increase area of contact and shearing resistance function.

Background technology

Crank arm is installed on the bicycle, and being mainly provides rider's foot pedal to promote the driver under stress element of bicycle walking, must possess enough force intensitys that is subjected to are arranged.Therefore the bicycle crank arm before is to take metallic material with after the forging type shape coarse-blank, carries out surface working again and handles.Yet follow the industrial technology progress, attachments of a bicycle are stressed lightweight, and need take into account the safety that acutely drives, be trend to adopt aluminum alloy or composite metal material little by little, even the inside of this crank arm has with forging method, makes its inner hollow that forms lower the weight purpose to reach, but is processed into the crank arm of inner hollow with forging, very time-consuming bothersome, outdated already on the processing procedure.

The market is disclosed as Taiwan patent announcement number 431405 " bicycle crank structure " patent case, announcement is by the one-body molded crank body 1 of making of aluminum alloy and a cover plate 2, wherein crank body 1 length direction has a relative head and an afterbody, this head is established the sleeve joint hole 3 for a bicycle siphunculus interlocking, rear crooked position in crank body 1 contiguous this head is established a peristome 4, a slotted eye 5 is established in the inside of crank body 1, one end of slotted eye 5 is closed end, the other end of slotted eye 5 communicates with peristome 4, slotted eye 5 inside are provided with at least one reinforced ribs 6 to promote the intensity of this crank arm, cover plate 2 and with welding or be fixed in peristome 4, make crank body 1 inner for hollow, reach the purpose of in light weight and cost-cutting with this.

But, desire to crank body 1 inside in the deep hole working mode, dig out slotted eye 5 and be not easy, particularly have several reinforced ribs 6 in the slotted eye 5, cause suitable narrow and smallly in the space that slotted eye 5 is processed, and be not easy operation, and after being processed to form slotted eye 5, must be again with welding manner with cover plate 2 involutions in peristome 4, very time-consuming bothersome, in fact and can't reach the purpose of cost-cutting.

The utility model content

In order to address the above problem, the utility model provides a kind of in light weight, quick crank arm that reaches the tool sufficient intensity of assembling.

For reaching above-mentioned purpose, the utility model is for disclosing a kind of crank arm, and it comprises that a public access spare and a female fitting dock driving fit with this public access spare.This public access spare is provided with one first wall, the length direction two ends of this first wall are respectively equipped with one first pivot end and one first drive end, this first pivot end wears one first axis hole, this first wall is established the protruding wall of a butt joint and is extended towards this mother's fitting direction from this first wall, and this wall that docks protruding wall is a male and fomale(M﹠F).It is relative with this first wall that this mother's fitting is provided with one second wall, the length direction two ends of this second wall are respectively equipped with one second pivot end and one second drive end, and this second wall is provided with that one second axis hole docks with this first axis hole and a position-limited trough is arranged at this second wall and docks protruding wall with this chimeric.

Concrete technical scheme of the present utility model is as follows:

A kind of crank arm comprises:

One public access spare is provided with one first wall, and the two ends of this first wall are respectively equipped with one first pivot end and one first drive end, and this first pivot end wears one first axis hole, and this first wall is established the protruding wall of a butt joint, and this wall that docks protruding wall is a male and fomale(M﹠F); And

One female fitting and this public access spare are involutory, it is relative with this first wall that it is provided with one second wall, the two ends of this second wall are respectively equipped with one second pivot end and one second drive end, this second wall be provided with that one second axis hole docks with this first axis hole and a position-limited trough dock protruding wall with this chimeric.

Further, this wall that docks protruding wall is wavy.

Further, this wall that docks protruding wall is zig-zag.

Further, this wall that docks protruding wall is the square wave shape.

Further, this to dock protruding wall be continual loop configuration.

Further, this second wall extends a ring wall towards this public access spare direction, and this ring wall is formed at the outer rim of this second wall, and this ring wall inboard establishes two relative ribs, and this position-limited trough is formed between this ring wall and these ribs.This ring wall and this first wall are fitted, and this ring wall is formed at the outer rim of this second wall, make this mother's fitting form frame flute profile attitude.

Further, this first wall also comprises at least one reinforced ribs, and this reinforced ribs is positioned at this inboard of docking protruding wall.Reinforced ribs is relative with this two rib and extend towards this mother's fitting direction from this first wall.

Further, this first wall is established one first axle bed, and this first axis hole is positioned at the center of this first axle bed, this first axle bed outer periphery, one dividing plate, protruding wall is docked adjacent to this in these dividing plate two ends, and this second pivot end is established one second axle bed, and this second axis hole is positioned at the center of this second axle bed.First axle bed extends towards this mother's fitting from this first wall, and protruding wall is docked at the two ends of this dividing plate with this adjacent.

Further, this first drive end is established one first hole seat, and one first dispensing hole is established at this seat center, first hole, and this second drive end establishes one second hole seat, and this second hole seat and this first hole seat are involutory, and one second dispensing hole is established at this seat center, second hole.

Further, this first wall is provided with at least one first fin, and this second wall is provided with at least one second fin, and this crank arm is to fashionable, and two walls that this first fin is relative with this second fin engage one another.First fin extends towards this mother's fitting direction, and second fin extends towards this public access spare direction.

The utlity model has following beneficial effect:

Crank arm of the present utility model, because the protruding wall of butt joint is male and fomale(M﹠F), and this ring wall, these ribs dock the wall that protruding wall cooperates with this and also are male and fomale(M﹠F), the chimeric area of contact of the protruding wall of this butt joint and this ring wall and rib has increased, can be effectively will trample the high-shear dispersion brought in the process of driving to the area that increases, and because this male and fomale(M﹠F) can effectively bear the stress from different directions, can directly absorb circulation and trample generation perpendicular to the stress on this male and fomale(M﹠F), reduce the formation of shearing, and then strengthened the bond strength of two face of joints and the useful life that prolongs face of joint; And because this docks protruding wall and this ring wall, these ribs are concavo-convex chimeric contact surface, when rider's foot pedal changes this crank arm loading angle, can avoid the slippage and have the braking positioning function each other of this public access spare and female fitting.

Description of drawings

Fig. 1 is the schematic perspective view of prior art bicycle crank structure.

Fig. 2 is the longitudinal sectional view of prior art bicycle crank structure.

Fig. 3 is the transverse sectional view of prior art bicycle crank structure.

Fig. 4 is the combination stereoscopic figure of the utility model preferred embodiment.

Fig. 5 is the three-dimensional exploded view of the utility model preferred embodiment.

Fig. 6 is the public access spare planar view of the utility model preferred embodiment.

Fig. 7 is female fitting planar view of the utility model preferred embodiment.

Fig. 8 is the combination generalized section of the utility model preferred embodiment.

Fig. 9 is for being equipped with bicycle scheme drawing of the present utility model.

Figure 10 is jagged male and fomale(M﹠F) for showing that the utility model docks protruding wall.

Figure 11 is for showing that the utility model docks the male and fomale(M﹠F) that protruding wall is the square wave shape.

Nomenclature:

(prior art)

1: the crank body; 2: cover plate;

3: sleeve joint hole; 4: peristome;

5: slotted eye; 6: reinforced ribs;

(the utility model)

10: public access spare; 11: the first walls;

12: the first pivot ends; 13: the first drive ends;

14: the first axis holes; 15,15a, 15b: dock protruding wall;

16: the first axle beds; 17: dividing plate;

18: reinforced ribs; 19: the first hole seats;

Assembly in 191: the first; 192: the first fins;

193: slit; 20,20a, 20b: female fitting;

21: the second walls; 22: the second pivot ends;

23: the second drive ends; 24: the second axis holes;

25,25a, 25b: position-limited trough; 26: ring wall;

27: rib; 28: the second axle beds;

29: the second hole seats; 291: the second dispensing holes;

292: the second fins; 30: bicycle;

31: axostylus axostyle; 32: the transmission chain drum;

33: pedal.

The specific embodiment

Relevant detailed content of the present utility model and technical description now are described further with embodiment, but will be appreciated that these embodiment are the usefulness for illustrating only, and should not be interpreted as the restriction that the utility model is implemented.

See also Fig. 4 to shown in Figure 7, crank arm of the present utility model comprises that a public access spare 10 and a female fitting 20 are in order to dock driving fit with public access spare 10.

Public access spare 10, be provided with one first wall 11, the length direction two ends of first wall 11 are respectively equipped with one first pivot end 12 and one first drive end 13, first pivot end 12 wears one first axis hole 14, first wall 11 is established the protruding wall 15 of a butt joint and is extended and be uninterrupted loop configuration to female fitting 20 directions from first wall 11, the wall that docks protruding wall 15 is wavy male and fomale(M﹠F), docks protruding wall 15 and sets up along the contour shape of first wall 11, makes public access spare 10 form frame flute profile attitude.First wall 11 is established the center that one first axle bed, 16, the first axis holes 14 are positioned at first axle bed 16 in the present embodiment, first axle bed, 16 outer periphery, one dividing plate 17, and its two ends are with to dock protruding wall 15 adjacent and curved.The length direction of first wall 11 is provided with a reinforced ribs 18 and extends to female fitting 20 directions from first wall 11, reinforced ribs 18 is positioned at the medial surface of the protruding wall 15 of butt joint, first drive end 13 is established one first hole seat 19, one first dispensing hole 191 is established at the first hole seat, 19 centers, first wall 11 is provided with at least one first fin 192 and extends towards female fitting 20 directions again, present embodiment is 2 first fins 192, is provided with a slit 193 between this 2 first fin 192.

It is relative with first wall 11 that female fitting 20 is provided with one second wall 21, the length direction of second wall 21 is provided with one second relative pivot end 22 and one second drive end 23, second wall 21 is provided with that one second axis hole 24 docks with first axis hole 14 and a position-limited trough 25 extends and with to dock protruding wall 15 chimeric to public access spare 10 from second wall 21, position-limited trough 25 is set up along the profile of second wall 21, the lateral border of second wall 21 extends a ring wall 26 and first wall 11 is closely connected towards public access spare 10 directions in the present embodiment, ring wall 26 is formed at the outer rim of this second wall 21, make female fitting 20 form frame flute profile attitude, ring wall 26 inboards are provided with two ribs 27 that extend and fit with first wall 11 along the length direction of second wall 21, this two rib 27 is for being oppositely arranged, position-limited trough 25 is formed between ring wall 26 and the rib 27, second wall 21 is established one second axle bed 28, second axis hole 24 is positioned at the center of second axle bed 28, second drive end 23 is established one second hole seat 29 and the first hole seat 19 is involutory again, one second dispensing hole 291 is established at the second hole seat, 29 centers, rib 27 connects the second hole seat 29, second wall 21 is provided with at least one second fin 292 and extends towards public access spare 10 directions again, this crank arm is to fashionable, this first fin 192 and this second fin 292 two relative walls engage one another, and second fin 292 is embedded in slit 193.

See also shown in Figure 8, can be earlier when making up crank arm of the present utility model coat on the face of joint of public access spare 10 and female fitting 20 with sticker, again public access spare 10 and female fitting 20 are involutory, dock the position-limited trough 25 that protruding wall 15 can embed female fitting 20 in the flush fit mode, the internal face that position-limited trough 25 is faced mutually just cooperates the outside wall surface of docking protruding wall 15 male and fomale(M﹠F)s, and second fin 292 can be chimeric with slit 193, and last public access spare 10 can be cemented because of sticker with female fitting 20.

Please consult Fig. 4 and Fig. 9 again, first axis hole 14, second axis hole 24 wear for the axostylus axostyle 31 of a bicycle 30, make a transmission chain drum 32 assembly of axostylus axostyle 31 and bicycle 30, and axostylus axostyle 31 two ends respectively articulate a crank arm of the present utility model, and first dispensing hole 191 of this two crank arm and second dispensing hole 291 then are used for respectively wearing for the axle of two pedals 33.

When rider's foot pedal 33, this two crank arms drive shaft rod 31, axostylus axostyle 31 drive 32 rotations of transmission chain drum again.Because this two crank arm constantly changes angle and is subjected to force direction along with rider's foot pedal 33, cause public access spare 10 and female fitting 20 to produce shearing with each other.

See also Figure 10 and Figure 11, Figure 10 shows that it is jagged male and fomale(M﹠F) that the utility model docks protruding wall 15a, its female fitting 20a is provided with a position-limited trough 25a and to dock protruding wall 15a chimeric, and Figure 11 shows the utility model male and fomale(M﹠F) that to dock protruding wall 15b be the square wave shape, and its female fitting 20b is provided with a position-limited trough 25b and to dock protruding wall 15b chimeric.

Because docking protruding wall 15, the utility model is wavy male and fomale(M﹠F), ring wall 26, rib 27 and dock the chimeric wall of protruding wall 15 and also be wavy male and fomale(M﹠F), increased and docked the chimeric area of contact of protruding wall 15 and ring wall 26 and rib 27, relative enhancement public access spare 10 and female fitting 20 be subjected to force intensity and shearing resistance function, and be concavo-convex chimeric contact surface because docking protruding wall 15 with ring wall 26, rib 27, when rider's foot pedal 33 changes the loading angle of these crank arms, can avoid the slippage and have the braking positioning function each other of public access spare 10 and female fitting 20.

What deserves to be mentioned is, the utility model public access spare 10 is provided with first fin 192 in addition, female fitting 20 is provided with second fin 292, promote the intensity of public access spare 10 and female fitting 20 respectively, public access spare 10 also is provided with reinforced ribs 18, except can strengthen public access spare 10 be subjected to can pass through reinforced ribs 18 clipping ribs 27 and second fin, 292 chimeric slits 193 again the force intensity, to enlarge the face of joint of public access spare 10 and female fitting 20, reach the purpose that firm location and enhancement are subjected to force intensity.

By above-mentioned embodiment as can be known, the utlity model has following advantage:

1. by the male and fomale(M﹠F) between the protruding wall of butt joint and position-limited trough being set and increasing the area of contact that structures such as rib, first fin, second fin and reinforced ribs reach to be increased between public access spare and female fitting, the area of contact that increases can evenly be dispersed to each face of joint with the shearing between public access spare and female fitting effectively, the shearing that makes the unit area face of joint bear diminishes, and then prolongs the useful life of sticker between face of joint and strengthen the shearing size that gross area face of joint can bear.

2. the male and fomale(M﹠F) that docks protruding wall and position-limited trough can bear circulation effectively and trample the non-directional stress that self-powered moved end in the process imposes on crank arm, make public access spare can carry out vertical conduction via the face of joint that docks between protruding wall and position-limited trough with the strength major part between female fitting, and then the shearing between the minimizing face of joint produces, and so can significantly reduce to produce slippage between public access spare and female fitting and have the function of braking location.

The above embodiment only is the preferred embodiment for proving absolutely that the utility model is lifted; can not limit protection domain of the present utility model with this; namely change according to the utility model claim and the simple equivalent done of creation description generally and modify, all still belong in the scope that the utility model patent contains.Protection domain of the present utility model is as the criterion with claims.

Claims

1. A crank arm, characterized in that it comprises:

A male connecting piece is provided with a first wall, and the two ends of the first wall are respectively provided with a first pivot end and a first driving end, and the first pivot end is pierced with a first shaft hole, and the first A pair of butt convex walls is provided on the wall, and the wall surface of the butt convex walls is a concave-convex surface; and

A female connecting piece is mated with the male connecting piece, and a second wall surface is opposite to the first wall surface. Both ends of the second wall surface are respectively provided with a second pivot end and a second driving end. The second wall surface The wall is provided with a second shaft hole docked with the first shaft hole and a limiting groove fitted with the docked convex wall.

2. The crank arm according to claim 1, characterized in that, the wall surface of the abutting convex wall is corrugated.

3 . The crank arm according to claim 1 , wherein the wall surface of the abutting convex wall is serrated. 4 .

4. The crank arm according to claim 1, characterized in that, the wall surface of the abutting convex wall is square wave.

5. The crank arm according to claim 1, wherein the abutting convex wall is an uninterrupted ring structure.

6. The crank arm according to claim 1, wherein a ring wall extends from the second wall toward the male connector, the ring wall is formed on the outer edge of the second wall, and the inner side of the ring wall There are two opposite ribs, and the limiting groove is formed between the ring wall and the two ribs.

7. The crank arm as claimed in claim 6, wherein the first wall further comprises at least one reinforcing rib, and the reinforcing rib is located on the inner side of the abutting convex wall.

8. The crank arm according to claim 1, wherein a first shaft seat is provided on the first wall, the first shaft hole is located at the center of the first shaft seat, and a spacer is provided on the periphery of the first shaft seat. The two ends of the partition are adjacent to the butt convex wall, the second pivot end is provided with a second shaft seat, and the second shaft hole is located at the center of the second shaft seat.

9. The crank arm according to claim 1, characterized in that, the first driving end is provided with a first hole seat, the center of the first hole seat is provided with a first set of matching holes, and the second driving end is provided with a A second hole seat, the second hole seat is matched with the first hole seat, and a second group of matching holes is arranged in the center of the second hole seat.

10. The crank arm according to claim 1, wherein the first wall is provided with at least one first rib, and the second wall is provided with at least one second rib, and when the crank arms are closed, the The two opposite wall surfaces of the first convex rib and the second convex rib engage with each other.