CN2729403Y

CN2729403Y - Drive shaft for bicycle driving device

Info

Publication number: CN2729403Y
Application number: CN 200420093613
Authority: CN
Inventors: 王进源
Original assignee: ZHIQING BICYCLE FITTING CO Ltd SHUNDE DISTRICT FOSHAN
Current assignee: ZHIQING BICYCLE FITTING CO Ltd SHUNDE DISTRICT FOSHAN
Priority date: 2004-09-30
Filing date: 2004-09-30
Publication date: 2005-09-28
Anticipated expiration: 2014-09-30

Abstract

The utility model provides a driving shaft for bicycle driving device, comprising a shaft body whose both ends are provided with screw threads. The both ends of the shaft body are provided with a plurality of symmetrical lateral faces in the screw threads and along the circumferential direction, wherein, the plurality of lateral faces are faces provided with inner concave arcs. When the utility model is used on the driving device of bicycles, the driving shaft which is tightly matched with the plurality of symmetrical lateral faces of the crank shaft is not easy to slip, with higher transmission efficiency.

Description

A kind of transmission shaft that is used for bicycle drive

Technical field:

The utility model relates to a kind of bicycle accessories, particularly a kind of transmission shaft that is used for bicycle drive.

Background technique:

At present on the market bicycle, be to utilize foot-operated to-and-fro motion mostly, cooperation by bent axle and transmission shaft makes gear make circular movement, thereby drive wheel movement, and the cooperation of bent axle and transmission shaft is to utilize crankshaft end that some planes are set, and transmission shaft also cooperates on the corresponding some planes of relative set, but often adding man-hour, because transmission shaft is the plane of external Cold Forging, the plane precision of its processing is higher, and the plane of bent axle is the built-in processing of milling, and the precision on its plane is lower, causing actual plane is with the face of going up curved arch, therefore causing when real work is not that the face face contact between bent axle and transmission shaft, but the some face contacts, so people were skidded when feeling pedal sometimes by bike the time, and some face when contact, transmission efficiency is relatively poor.

The model utility content:

The utility model is to provide a kind of being difficult for to skid, and also is difficult for causing crank to come off, the transmission shaft that is used for bicycle drive that transmission efficiency is higher.

Technological scheme provided by the utility model is: comprise axis body, the two ends of described axis body are provided with screw thread, and described axis body two ends are positioned at the screw thread inboard some symmetrical sides along the circumferential direction are set, and wherein some described sides are the face of band indent arc.

The utility model is when real work, because built-in some symmetrical sides of crankshaft end are with the face of going up curved arch, and the corresponding cooperation of face that the set some symmetries of described axis body are with the indent arcs, both contacts this moment just are the contacts of face face, therefore transmission efficiency is higher, and is difficult between the two skidding.

Description of drawings:

Now in conjunction with the accompanying drawings the utility model is further described:

Fig. 1 is a structural representation of the present utility model;

Fig. 2 is the A-A direction front view of Fig. 1;

Fig. 3 is a user mode reference drawing of the present utility model;

Embodiment:

Shown in Fig. 1-2, the utility model comprises: axis body 1, and the two ends of described axis body 1 are provided with screw thread 2, and described axis body 1 two ends are positioned at screw thread 2 inboards some symmetrical sides 3 along the circumferential direction are set, and wherein some described sides 3 are the face of band indent arc.The utility model in use, as shown in Figure 3, when the built-in some symmetrical sides in the some symmetrical side 3 of described axis body 1 and the end of bent axle 4 cooperate, owing to adding man-hour, built-in some symmetrical sides of bent axle 4 are often with the face of going up curved arch, therefore both will produce the contact of larger area face face, thereby improve transmission efficiency, and reduce skidding of the transmission device of people under use bicycle state.

The indent radian of described side 3 is that 1R-100R is an optimum range.

Claims

1. a transmission shaft that is used for bicycle drive comprises axis body, and the two ends of described axis body are provided with screw thread, and described axis body two ends are positioned at the screw thread inboard some symmetrical sides along the circumferential direction are set, and it is characterized in that: some described sides are the face of band indent arc.

2. the transmission shaft that is used for bicycle drive according to claim 1 is characterized in that: the indent radian of described side is 1R-100R.