CN215553900U - Sprocket crank for road bicycle - Google Patents

Abstract

The utility model discloses a sprocket crank for a road bicycle, which has the technical scheme that: the crank comprises a protective disc, a toothed disc and a crank, wherein the crank comprises a first crank arm and a second crank arm, the crank arm and a fixed disc on the second crank arm are integrally formed, a crank shaft is fixedly arranged in the middle of the fixed disc, a connecting hole is fixedly arranged in the central position of the protective disc and the toothed disc, fixing holes are correspondingly formed in the fixed disc, the protective disc and the toothed disc, the fixing holes in the fixed disc, the protective disc and the toothed disc are fixedly connected through screws, and a telescopic device is fixedly arranged on the crank; the utility model solves the problems that the length of the crank of the chain wheel crank cannot be adjusted and the chain wheel crank is complex in structure and inconvenient to use.

Description

Sprocket crank for road bicycle

Technical Field

The utility model relates to the technical field of chain wheel cranks, in particular to a chain wheel crank for a road bicycle.

Background

The bicycle drive mechanism typically includes one or more front sprockets disposed on a bicycle crank sprocket assembly and one or more rear sprockets disposed on a bicycle rear hub, a chain wrapped around the front and rear sprockets, rotational motion imparted by the bicycle crank sprocket assembly by a rider operation being transmitted to a rear wheel through the chain engaged with the front and rear sprockets, the bicycle chain having a plurality of inner links and a plurality of outer links alternately connected to each other by a plurality of pins.

Referring to the prior chinese patent publication No. CN212843761U, a bicycle crank sprocket assembly is disclosed, comprising a crank arm and at least one sprocket, wherein the sprocket comprises a set of regular teeth and a set of first and second teeth, and the first teeth have a first chain engaging tooth width for engaging an outer link of a bicycle chain, and the second teeth have a second chain engaging tooth width for engaging an inner link of a bicycle chain, the first chain engaging tooth width being greater than the second chain engaging tooth width, the regular teeth have a third chain engaging tooth width, which is less than the first chain engaging tooth width, the utility model discloses a bicycle can improve the safety of walking especially on rugged terrain.

However, the above-mentioned sprocket cranks still have some disadvantages, such as: the length of the crank of the chain wheel crank cannot be adjusted, so that the chain wheel crank is inconvenient for different people to use; the structure of the chain wheel crank is complex and inconvenient to use.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a chain wheel crank for a road bicycle, aiming at solving the problems that the length of the chain wheel crank cannot be adjusted and the chain wheel crank is complex in structure and inconvenient to use.

The technical purpose of the utility model is realized by the following technical scheme:

the utility model provides a sprocket crank for highway bicycle, includes the protection dish, the chain wheel, the crank comprises first crank arm and second crank arm, crank arm and fixed disk integration shaping on the second crank arm, the fixed crank axle that is provided with in middle part of fixed disk, the fixed connecting hole that is provided with of central point department on protection dish, the chain wheel, the fixed orifices has been seted up to the correspondence on fixed disk, protection dish, the chain wheel, the fixed orifices on fixed disk, protection dish, the chain wheel passes through screw fixed connection, the fixed telescoping device that is provided with on the crank.

Furthermore, the number of the cranksets is three, and the diameter of the crankset on one side close to the protective disc is reduced in sequence.

By adopting the technical scheme, the chain is adjusted into the corresponding chain wheel through the speed changer, so that the speed change of the bicycle is realized.

Furthermore, a protection ring is fixedly arranged on the outer side of the protection disc.

Through adopting above-mentioned technical scheme, promote the crashproof nature of protection dish, prevent that the trouser legs from being drawn into in the chain wheel.

Furthermore, key grooves are correspondingly arranged on the crank shaft and the connecting holes, and the crank shaft sequentially penetrates through the connecting holes of the protective disc and the toothed disc from inside to outside.

Through adopting above-mentioned technical scheme, the keyway can carry out the gomphosis with crank axle and connecting hole, and more resistant punching press.

Further, the telescoping device has telescopic link, fixed buckle, limiting plate to constitute, and a plurality of holes have evenly been seted up to vertical direction on the telescopic link, and the inside of first crank arm sets up flexible chamber, and the one end and the first crank arm fixed connection of telescopic link, telescopic link are inserted and are put flexible chamber, and the one end in flexible chamber is fixed and is provided with the limiting plate, is provided with fixed buckle on the second crank arm, and the dead lever of fixed buckle is inserted and is put in the hole

Through adopting above-mentioned technical scheme, realize changing crank length, be applicable to different crowds.

Furthermore, one end of the first crank arm is provided with a pedal mounting hole.

By adopting the technical scheme, the pedal holes are convenient to connect.

In summary, the utility model mainly has the following beneficial effects:

1. the utility model discloses a, through the telescoping device, realize changing crank length, pull the fixed buckle on the second crank arm, adjust the first crank arm of pulling, the telescopic link slides in flexible chamber, adjusts suitable position, inserts the dead lever of fixed buckle and fixes in the hole to changed whole articulate length fast, made things convenient for different crowds' use.

2. The utility model discloses a, it sets up the keyway to correspond on through crank axle and the connecting hole for the crank axle carries out better gomphosis with the connecting hole, and more resistant punching press, it is safer to use through crank arm and fixed disk integration shaping design, and driven effect is better, and the protection ring that sets up through the outside of protection dish promotes the crashproof nature of protection dish, prevents that the trouser legs from being drawn into the chain wheel in, and the connected mode between fixed disk, protection dish, the chain wheel is convenient to be dismantled and is replaced, and then promotes sprocket articulate performance.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the principles of the utility model and not to limit the utility model. In the drawings:

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic structural view of the crank;

fig. 3 is a schematic structural diagram of a in fig. 2.

In the figure: 1. a protection disk; 2. a chain wheel; 3. a crank; 301. a first crank arm; 302. a second crank arm; 4. fixing the disc; 5. a crank shaft; 6. a telescoping device; 601. a telescopic rod; 602. fixing the buckle; 603. a limiting plate; 7. a hole; 8. a keyway; 9. a telescoping chamber; 10. and (7) installing holes.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clear and fully described, embodiments of the present invention are further described in detail below with reference to the accompanying drawings.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "inner", "outer", "top", "bottom", "side", "vertical", "horizontal", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," "fourth," "fifth," and "sixth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example 1

Referring to fig. 1-3, a sprocket crank for a road bicycle comprises a protective disc 1, a chain wheel 2, a crank 3, a chain wheel 2, wherein the chain wheel 2 is made of high carbon steel, and is strong, firm and durable in rigidity, the chain wheel 2 is of a hollow structure, so that the whole weight of the whole bicycle is reduced, a rider can ride the bicycle more easily, the whole weight of the whole bicycle is reduced, the crank 3 is made of aviation aluminum alloy, and is light, strong and durable in rigidity, the crank 3 is composed of a first crank arm 301 and a second crank arm 302, the crank arm and a fixed disc 4 on the second crank arm 302 are integrally formed, a crank shaft 5 is fixedly arranged in the middle of the fixed disc 4, a connecting hole is fixedly arranged at the central position of the protective disc 1 and the chain wheel 2, the fixed disc 4, the protective disc 1 and the chain wheel 2 are correspondingly provided with a fixing hole, the fixed disc 4, the protective disc 1 and the fixing hole on the chain wheel 2 are fixedly connected through screws, a telescopic device 6 is fixedly arranged on the crank 3.

Referring to fig. 1, the number of the chain wheel 2 is three, the diameter of the chain wheel 2 on one side close to the protective disc 1 is reduced in sequence, and the chain is transferred into the corresponding chain wheel 2 through the speed changer, so that the speed change of the bicycle is realized.

Referring to fig. 1, a protection ring is fixedly arranged on the outer side of the protection disc 1, so that the impact resistance of the protection disc 1 is improved, and trouser legs are prevented from being involved in the chain wheel 2.

Referring to fig. 2, the key groove 8 is correspondingly arranged on the crank shaft 5 and the connecting hole, the key groove 8 is petal-shaped, the crank shaft 5 sequentially penetrates through the connecting holes of the protective plate 1 and the toothed disc 2 from inside to outside, and the key groove 8 can be embedded with the crank shaft 5 and the connecting hole, so that the crank shaft is more resistant to stamping.

Referring to fig. 2 and 3, telescoping device 6 has telescopic link 601, fixed buckle 602, the limiting plate 603 is constituteed, a plurality of holes 7 have evenly been seted up to vertical direction on the telescopic link 601, the inside of first crank arm 301 sets up flexible chamber 9, the one end and the first crank arm 301 fixed connection of telescopic link 601, telescopic link 601 is inserted in flexible chamber 9, the fixed limiting plate 603 that is provided with of one end in flexible chamber 9, be provided with fixed buckle 602 on the flexible second crank arm 302, the dead lever of fixed buckle 602 is inserted and is put in hole 7, dead lever and hole 7 have magnetism, and magnetism is opposite, fixed connection that can be better.

Referring to fig. 1 and 2, a pedal mounting hole 10 is formed at one end of the first crank arm 301 to fixedly mount the pedal.

When the crank is used, the length of the crank 3 is changed through the telescopic device 6, the fixing buckle 602 on the second crank arm 302 is pulled, the first crank arm 301 is adjusted and pulled, the telescopic rod 601 slides in the telescopic cavity 9, the proper position is adjusted, and the fixing rod of the fixing buckle 602 is inserted into the hole 7 to be fixed, so that the length of the whole crank 3 is quickly changed, and the use of different people is facilitated; correspond on 5 and the connecting hole through the crank axle and set up keyway 8 for crank axle 5 carries out better gomphosis with the connecting hole, and more resistant punching press, it is safer to use through crank arm and 4 integrated into one piece designs of fixed disk, driven effect is better, the guard ring that sets up through the outside of guard plate 1, promote the crashproof nature of guard plate 1, prevent that the trouser legs from being drawn into in chain wheel 2, fixed disk 4, guard plate 1, the connected mode between chain wheel 2, the convenient dismantlement is replaced.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the utility model. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (6)

1. The utility model provides a sprocket crank for highway bicycle, includes protection dish (1), chain wheel (2), crank (3), its characterized in that: crank (3) comprise first crank arm (301) and second crank arm (302), crank arm and fixed disk (4) integration shaping on second crank arm (302), the fixed crank axle (5) that is provided with in middle part of fixed disk (4), the fixed connecting hole that is provided with of central point department on protection dish (1), chain wheel (2), the fixed orifices has been seted up to corresponding on fixed disk (4), protection dish (1), chain wheel (2), on fixed disk (4), protection dish (1), chain wheel (2) the fixed orifices passes through screw fixed connection, the fixed telescoping device (6) that are provided with on crank (3).

2. The sprocket crank for a road bike as claimed in claim 1, wherein: the number of the cranksets (2) is three, and the diameter of the crankset (2) on one side close to the protective disc (1) is reduced in sequence.

3. The sprocket crank for a road bike as claimed in claim 1, wherein: and a protective ring is fixedly arranged on the outer side of the protective disc (1).

4. The sprocket crank for a road bike as claimed in claim 1, wherein: crank axle (5) with correspond on the connecting hole and set up keyway (8), crank axle (5) is from interior to exterior passes in proper order the connecting hole of protection dish (1), chain wheel (2).

5. The sprocket crank for a road bike as claimed in claim 1, wherein: telescoping device (6) have telescopic link (601), fixed buckle (602), limiting plate (603) to constitute, and a plurality of holes (7) have evenly been seted up to vertical direction on telescopic link (601), the inside of first crank arm (301) sets up flexible chamber (9), the one end of telescopic link (601) with first crank arm (301) fixed connection, telescopic link (601) are inserted in flexible chamber (9), the fixed limiting plate (603) that is provided with of one end in flexible chamber (9), be provided with fixed buckle (602) on second crank arm (302), the dead lever of fixed buckle (602) is inserted and is put in hole (7).

6. The sprocket crank for a road bike as claimed in claim 1, wherein: one end of the first crank arm (301) is provided with a pedal mounting hole (10).

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