CN215245349U

CN215245349U - Combined crank

Info

Publication number: CN215245349U
Application number: CN202121318020.5U
Authority: CN
Inventors: 宋泽宇
Original assignee: Lanxi Wheel Top Cycle Industries Ltd
Current assignee: Lanxi Wheel Top Cycle Industries Ltd
Priority date: 2021-06-15
Filing date: 2021-06-15
Publication date: 2021-12-21
Anticipated expiration: 2031-06-15

Abstract

The utility model discloses a combined crank, which comprises a plastic crank main body (1), wherein a middle shaft end metal piece (2) and a pedal end metal piece (3) are respectively fixed at the two end parts of the plastic crank main body (1); a taper square hole (4) is arranged on the middle shaft end metal piece (2), and a threaded hole (5) is arranged on the pedal end metal piece (3). The utility model discloses not only can conveniently process, still have the cost lower, the durability is better, intensity is higher and more pleasing to the eye advantage.

Description

Combined crank

Technical Field

The utility model relates to a bicycle accessory, especially a combination crank.

Background

At present, cranks for bicycles, which are common in the market, are metal cranks, and when the metal cranks are machined, metal is firstly machined into cylindrical metal sections, and then the metal sections are forged and machined, so that the metal cranks can be machined; in addition, in order to prevent the metal crank from rusting, the metal crank needs to be painted or coated with plastic, so that the processing is troublesome, and the raw material cost and the processing cost are high. Therefore, the conventional bicycle crank has the problems of troublesome processing and high cost.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a combination crank. The utility model discloses not only can conveniently process, still have the lower advantage of cost.

The technical scheme of the utility model: a kind of combination crank, including the plastic crank body, the two ends of the plastic crank body are fixed with the middle shaft end metalwork and pedal end metalwork respectively; the middle shaft end metal piece is provided with a conical square hole, and the pedal end metal piece is provided with a threaded hole.

In the above-mentioned combined crank, the middle shaft end metal piece and the pedal end metal piece are both coated in the plastic crank main body.

In the above-mentioned combination crank, a plurality of reinforcing ribs are provided on the main body of the plastic crank.

In the above-mentioned combination crank, the reinforcing rib is located inside the plastic crank main body, and the reinforcing rib is located at a position between the middle shaft end metal piece and the pedal end metal piece.

Compared with the prior art, the utility model uses plastic as the crank main body, and the middle shaft end metal piece and the pedal end metal piece are arranged at the positions for connection at the two ends, thereby reducing the raw material cost (the raw material cost of the plastic is lower than that of the metal) while ensuring the durability, and further reducing the raw material cost; the plastic crank main body can be formed only by heating, melting and injection molding the plastic particles, and the plastic crank main body is convenient to process and low in processing cost. In addition, the middle shaft end metal piece and the pedal end metal piece of the utility model are both coated in the plastic crank main body, thereby avoiding rusting and damage and improving the durability; the plastic crank main body is provided with a plurality of reinforcing ribs, so that the strength of the plastic crank main body is improved; the reinforcing ribs are positioned on the inner side (facing one side of the bicycle) of the plastic crank main body, so that the attractiveness is guaranteed; the reinforcing rib is positioned between the middle shaft end metal piece and the pedal end metal piece, so that the main stressed part during crank transmission is enhanced, and the strength is improved. Therefore, the utility model discloses not only can conveniently process, still have the cost lower, the durability is better, intensity is higher and more pleasing to the eye advantage.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

fig. 2 is a cross-sectional view of the present invention.

The labels in the figures are: 1-plastic crank main body, 2-middle shaft end metal piece, 3-pedal end metal piece, 4-conical square hole, 5-threaded hole and 6-reinforcing rib.

Detailed Description

The following description is made with reference to the accompanying drawings and examples, but not to be construed as limiting the invention.

Examples are given. A kind of association crank, the composition is as shown in fig. 1 and 2, including plastic crank body 1, the both ends of the plastic crank body 1 are fixed with the end metalwork 2 of mean axis and pedal end metalwork 3 separately; the middle shaft end metal piece 2 is provided with a conical square hole 4, and the pedal end metal piece 3 is provided with a threaded hole 5.

The middle shaft end metal piece 2 and the pedal end metal piece 3 are both coated in the plastic crank main body 1; a plurality of reinforcing ribs 6 are arranged on the plastic crank main body 1; the reinforcing rib 6 is positioned on the inner side of the plastic crank main body 1, and the reinforcing rib 6 is positioned between the middle shaft end metal piece 2 and the pedal end metal piece 3.

The working principle is as follows: a middle shaft end metal piece 2 is arranged at one end of the plastic crank main body 1, and a tapered square hole 4 for connecting a middle shaft is formed in the middle shaft end metal piece 2; the other end of the plastic crank main body 1 is provided with a pedal end metal piece 3, and a threaded hole 5 for connecting a pedal is formed in the pedal end metal piece 3; the middle shaft end metal piece 2 and the pedal end metal piece 3 are both coated in the plastic crank main body, so that the middle shaft end metal piece 2 and the pedal end metal piece 3 are not easy to rust and damage.

The outside of the plastic crank main body 1 is a plane, and the inside of the plastic crank main body is provided with a plurality of reinforcing ribs 6, so that the strength of the plastic crank main body 1 is greatly improved.

Claims

1. A kind of combination crank, characterized by: the crank comprises a plastic crank main body (1), wherein a middle shaft end metal piece (2) and a pedal end metal piece (3) are respectively fixed at two end parts of the plastic crank main body (1); a conical square hole (4) is arranged on the middle shaft end metal piece (2), and a threaded hole (5) is arranged on the pedal end metal piece (3); a plurality of reinforcing ribs (6) are arranged on the plastic crank main body (1); the reinforcing rib (6) is positioned on the inner side of the plastic crank main body (1), and the reinforcing rib (6) is positioned between the middle shaft end metal piece (2) and the pedal end metal piece (3).

2. A combination crank according to claim 1, characterized in that: the middle shaft end metal piece (2) and the pedal end metal piece (3) are both coated in the plastic crank main body (1).