CN211996034U

CN211996034U - Composite crank

Info

Publication number: CN211996034U
Application number: CN202020693800.7U
Authority: CN
Inventors: 王洪乐
Original assignee: Huanghua Yanyun Plastic Products Co ltd
Current assignee: Huanghua Yanyun Plastic Products Co ltd
Priority date: 2020-04-29
Filing date: 2020-04-29
Publication date: 2020-11-24
Anticipated expiration: 2030-04-29

Abstract

The utility model provides a composite crank, including iron and crank main part, iron includes handle arm and both ends difference fixed connection's axis external member and pedal external member, and the crank main part moulds the body including the axis of a body structure, the body is moulded at the middle part and the body is moulded to the pedal, and the body is moulded to the peripheral fixed connection axis of axis external member, and the body is moulded at the peripheral fixed connection middle part of handle arm, and the body is moulded to the peripheral fixed connection pedal of pedal external member. Compound crank, on the basis of the female base of iron support, cover ABS plastics, furthest's reduction the use of iron material, reduce single product quality simultaneously, reduce raw and other materials, comprehensive cost such as finished product transportation, and accord with the design idea that reduces whole car quality, cover ABS plastics back product and need not do surface treatment again, need not consider environmental pollution's problem, and product surface strength can reach the user demand completely, the outward appearance can be more beautiful perfect than spraying or electrophoresis lacquer, make the product from directly perceived more embodying the integration simultaneously.

Description

Composite crank

Technical Field

The utility model belongs to the technical field of the bicycle accessory, especially, relate to a compound crank.

Background

The conventional crank is manufactured by adopting a cold forging or die-casting process, then surface treatment is carried out, the process is spraying or electrophoretic paint, the cold forging or die-casting process has high cost, the process is complex, the quality of a single product is heavy, the requirement on production equipment is high by an appearance treatment process, and the environment is polluted by the spraying and electrophoretic paint treatment, so that the use of iron materials is reduced to the maximum extent, the production cost is greatly reduced, the requirement of consumers on the appearance is met, the preparation process of the environmental pollution problem is not considered, and the produced bicycle crank is manufactured.

Disclosure of Invention

In view of this, the utility model aims at providing a composite crank to provide a furthest has reduced the use of iron material, greatly reduced manufacturing cost, both must satisfy the requirement of consumer to the outward appearance simultaneously, and need not consider the preparation process of environmental pollution problem, the bicycle crank of producing.

In order to achieve the above purpose, the technical scheme of the utility model is realized like this:

the utility model provides a composite crank, includes iron and crank main part, and iron includes handle arm and axis external member and the pedal external member that both ends difference fixed connection, and the crank main part includes axis plastomer, middle part plastomer and the pedal plastomer of integrative structure, and the peripheral fixed connection axis plastomer of axis external member, the peripheral fixed connection middle part plastomer of handle arm, the pedal external member peripheral fixed connection pedal plastomer.

Furthermore, the axis external member includes first base and card pipe, and the cross section of first base is the arc wall structure, and first base periphery fixed connection is to handle arm one end, and first base recess bottom installation card pipe.

Furthermore, the cross section of handle arm is the U-shaped structure, and first base and handle arm are tensile integrative structure, and the material of handle arm and first base is iron plate.

Furthermore, the height difference between the bottom end of the handle arm and the bottom end of the first base is H, and H is not less than 3 mm.

Further, the axis plastomer body includes second base, the ring of moulding and the boss of integrative structure, and the second base is the drum structure, and second base bottom is connected to the boss through moulding the ring, and the boss is hollow square tubular construction, and the peripheral fixed connection of card pipe is to the boss inner periphery, and boss top fixed connection is to the one end of moulding the ring, and the other end of moulding the ring is arc groove structure, the peripheral fixed connection of first base to second base inner circle.

Furthermore, the height difference between the end surface of the bottom end of the first base and the end surface of the second end of the second base is not less than 1/2 of the height of the second base.

Furthermore, the second base, the boss, the plastic ring, the middle plastic body and the pedal plastic body are all made of ABS.

Compared with the prior art, compound crank have following advantage:

(1) compound crank, on the basis of the female base of iron support, cover ABS plastics, furthest's reduction the use of iron material, reduce single product quality simultaneously, reduce comprehensive cost such as raw and other materials, finished product transportation, and accord with the design of reducing whole car quality.

(2) Compound crank, cover ABS plastics back product need not do surface treatment again, need not consider environmental pollution's problem, product surface strength can reach the user demand completely moreover, the outward appearance can be more beautiful perfect than spraying or electrophoresis lacquer, make the product from directly perceived more can embody the integration simultaneously.

(3) Compound crank, in process of production, only need draw embryo equipment and injection moulding device, require lowly to production facility, product quality very easily controls simultaneously, and production efficiency is high.

Drawings

The accompanying drawings, which form a part hereof, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation. In the drawings:

fig. 1 is a schematic structural view of an iron member according to an embodiment of the present invention;

fig. 2 is a schematic structural view of a main body of a crank according to an embodiment of the present invention;

fig. 3 is a schematic structural view of the crank main body and the iron member assembly according to the embodiment of the present invention;

fig. 4 is a side view of an iron member according to an embodiment of the present invention;

fig. 5 is a sectional view of the middle shaft plastic body according to the embodiment of the present invention.

Description of reference numerals:

1-an iron part; 11-a handle arm; 12-a bottom bracket assembly; 121-a first base; 122-clamp tube; 123-a first via; 13-a pedal kit; 2-a crank body; 21-middle shaft plastic body; 211-boss; 212-a second base; 213-plastic ring; 22-middle plastic body; and 23-pedaling the plastomer.

Detailed Description

It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; 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 meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

As shown in fig. 1-5, the composite crank comprises an iron member 1 and a crank main body 2, wherein the iron member 1 comprises a handle arm 11, a middle shaft sleeve member 12 and a pedal sleeve member 13, both ends of which are fixedly connected with each other, and a load reinforcing rib for the crank main body 2, the crank main body 2 comprises a middle shaft plastic body 21, a middle plastic body 22 and a pedal plastic body 23 which are integrally structured, the middle shaft plastic body 21 is injection-molded on the periphery of the middle shaft sleeve member 12, the middle plastic body 22 with a rectangular cross section is injection-molded on the periphery of the handle arm 11, and the pedal plastic body 23 with a hollow cylindrical cross section is injection-molded on the periphery.

As shown in fig. 1, the bottom bracket assembly 12 includes a first base 121 and a clamping tube 122, the cross section of the first base 121 is a groove structure, the periphery of the first base 121 is fixedly connected to one end of the handle arm 11, a first through hole 123 is formed at the bottom of the first base 121, the clamping tube 122 is arranged at the bottom of the first base 121 at the periphery of the first through hole 123, and the clamping tube 122 is injection-molded at the periphery of the clamping tube 122.

The cross section of the handle arm 11 is of a U-shaped structure, the first base 121 and the handle arm 11 are of a stretching integrated structure, the conventional crank is manufactured by adopting a cold forging or die casting process, then surface treatment is performed, the process is spraying or electrophoretic paint, the cold forging or die casting process is high in energy consumption and cost, and the spraying and electrophoretic paint treatment can pollute the environment.

The handle arm 11 and the first base 121 are both made of iron plates, and the thicknesses of the handle arm 11 and the first base 121 are not less than 1mm, so that the mechanical strength of the handle arm 11 and the first base 121 is ensured.

As shown in fig. 4, the height difference between the bottom end of the handle arm 11 and the bottom end of the first base 121 is H, H is not less than 3mm, and this distance is used for the nut position when the composite crank is mounted to the middle shaft of the tray frame, and this part is used for the pre-reserved position before the middle molded body 21 and the middle molded body 22 in the injection molding.

Card pipe 122 is rectangle side pipe, is iron side pipe for, and the wall thickness of card pipe 122 is not less than 1mm, and the transmission power that the axle conduction manpower was ridden in the joint plate rail on the one hand of the design of rectangle side pipe, on the other hand conveniently change, the dismouting because the bicycle divide into about two pedal cranks, when installing two cranks, need horizontal mirror image and vertical mirror image, the joint position is distinguished more easily to square buckle than the gear buckle, can not install the dislocation.

The cross section of pedal external member 13 is hollow cylinder structure, and pedal external member 13 periphery fixed connection is to handle arm 11 one end, and the inner circle is equipped with the internal thread for the pedal of threaded connection usefulness of riding.

As shown in fig. 2 and 5, the middle shaft plastic body 21 includes a second base 211, a plastic ring 213 and a boss 212, the second base 211 is a cylinder structure, the bottom of the second base 211 is connected to the boss 212 through the plastic ring 213, the boss 212 is a hollow square tube structure, the periphery of the clamping tube 122 is fixedly connected to the inner periphery of the boss 212, the top end of the boss 212 is fixedly connected to one end of the plastic ring 213, the other end of the plastic ring 213 is an arc groove structure, the space is reserved for a gasket on the middle shaft of the plate rack, meanwhile, the arc structure is more favorable for bearing the transverse shearing force during riding, the stress is uniform, the service life of the product is prolonged, and the periphery of the first base 121 is fixedly connected to the inner ring of the.

The outer diameter of the first base 121 is the same as the inner diameter of the second base 211, and the length of the inner periphery of the boss 212 is equal to the length of the outer periphery of the clamping tube 122.

The height difference between the end face of the bottom end of the first base 121 and the end face of the second end of the second base 211 is not smaller than 1/2 of the height of the second base 211, and the composite crank is used for a nut position when being installed on a central shaft of a disc frame, so that the shaft end and the nut are prevented from being separated, the appearance is influenced, and a rider is easily injured.

The materials of the second base 211, the boss 212, the plastic ring 213, the middle plastic body 22 and the pedal plastic body 23 are all ABS, the ABS plastic is terpolymer of three monomers of acrylonitrile, butadiene and styrene, the ABS plastic is tough, hard and rigid material which has easily obtained raw materials, good comprehensive performance, low price and wide application, thus not only ensuring the mechanical strength required by the riding crank, but also lightening the weight of the part, simultaneously having beautiful appearance and difficult corrosion, and compared with the traditional spraying or electrophoretic paint, the production process does not need to be surface treated, and does not need to consider the problem of environmental pollution.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. Compound crank, its characterized in that: including iron part (1) and crank main part (2), iron part (1) includes handle arm (11) and both ends difference fixed connection's axis external member (12) and pedal external member (13), crank main part (2) are including axis plastomer (21), middle part plastomer (22) and pedal plastomer (23) of a body structure, axis external member (12) peripheral fixed connection axis plastomer (21), handle arm (11) peripheral fixed connection middle part plastomer (22), pedal external member (13) peripheral fixed connection pedal plastomer (23).

2. The compound crank of claim 1, wherein: the middle shaft kit (12) comprises a first base (121) and a clamping pipe (122), the cross section of the first base (121) is of an arc-shaped groove structure, the periphery of the first base (121) is fixedly connected to one end of the handle arm (11), and the clamping pipe (122) is installed at the bottom of a groove of the first base (121).

3. The compound crank of claim 2, wherein: the first base (121) and the handle arm (11) are of a stretching integrated structure, and the first base (121) and the handle arm (11) are both made of iron plates.

4. The compound crank of claim 2, wherein: the height difference between the bottom end of the handle arm (11) and the bottom end of the first base (121) is H, and H is not less than 3 mm.

5. The compound crank of claim 2, wherein: the middle shaft plastic body (21) comprises a second base (211) of an integral structure, a plastic ring (213) and a boss (212), the second base (211) is of a cylinder structure, the bottom of the second base (211) is connected to the boss (212) through the plastic ring (213), the boss (212) is of a hollow square tube structure, the periphery of a clamping tube (122) is fixedly connected to the inner periphery of the boss (212), one end of the plastic ring (213) is of an arc groove structure, and the periphery of a first base (121) is fixedly connected to the inner ring of the second base (211).

6. The compound crank of claim 5, wherein: the height difference between the end surface of the bottom end of the first base (121) and the end surface of the second end of the second base (211) is not less than 1/2 of the height of the second base (211).

7. The compound crank of claim 5, wherein: the second base (211), the boss (212), the plastic ring (213), the middle plastic body (22) and the pedal plastic body (23) are all made of ABS.