CN1180633A

CN1180633A - Crank gear for cycle

Info

Publication number: CN1180633A
Application number: CN 97120439
Authority: CN
Inventors: 夏尔·奥贝尼歇
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-10-15
Filing date: 1997-10-14
Publication date: 1998-05-06
Also published as: FR2754512B1; ITRM970617A1; ITRM970218U3; FR2754512A1; IT1295424B1

Abstract

The pedal drive has an axle (2) fixed to a toothed sprocket (1) and a crank (7,7') of which one end is fixed to the sprocket at a point eccentric with respect to the axis of the pedal axle and the other end supports a pedal. The crank has two branches (5,6) formed as a V-shape which is fixed together at one end to carry the pedal and which diverges towards the other end to be fixed to the sprocket at two points symmetrically with respect to the axle.

Description

Crank gear for cycle

The present invention is about crank gear for cycle.

As an example, the same applicant's on June 30th, 1989 patent n.89,08770 (2649066), a kind of crank gear for cycle is produced in suggestion, its foot-operated crank is when being connected with the crank gear circumference, be supported on by its cylindrical on the excircle of crank gear axle, no longer be installed in the crank gear shaft end.Like this, foot-operated crank will impose on the bigger power of power that is connected stretcher on the foot-operated crank opposite end than the cyclist and pass to the crank gear axle just as a lever, arrive the trailing wheel of bicycle again by driving chain.

The objective of the invention is to produce a kind of crank gear for cycle, it was both simple with the moderate price manufacturing, certain external force that the cyclist is applied, still by using the lever force of foot-operated crank effect, be sent on the crank gear axle, this lever force is more a lot of greatly than the power that is obtained from the traditional crank gear.

According to the present invention, traditional crank gear for cycle comprises the crank gear axle that is connected with tooth plate and foot-operated crank, one end of foot-operated crank be fixed on the above-mentioned tooth plate with respect to outside the crank gear axle center certain a bit on, here foot-operated crank comprises two V-arrangement branches, the one end is connected to each other together with the installing stretcher, its other end separately be fixed on the tooth plate with axisymmetric 2 of crank gear on.Foot-operated two branches of crank are fixed to point on the tooth plate preferably to be positioned near latter's periphery.

Therefore, need not revise the axis hole of dress stretcher and the gauged distance between the crank gear axis, also promptly need not increase the rotation girth of stretcher, the length of riding crank can be increased a lot, and the power that is therefore applied by the cyclist, pass on the bicycle trailing wheel messenger chain by tooth plate increases a lot.The foot-operated crank length of embodiment can increase about 10% than the foot-operated crank of tradition.

In addition, draw tooth plate when guaranteeing that the latter rotates when V-type branch of foot-operated crank of the present invention, another branch promotes this plate, thereby has improved efficient.

In order to be expressly understood equipment of the present invention, next, lift a non-restrictive example and remodeling thereof with reference to appended sketch, wherein:

Fig. 1 is according to a main embodiment of the present invention, bicycle right side crank gear front elevation.

Fig. 2 is corresponding to Fig. 1 and shows view through an improved embodiment.

Fig. 1 is shown with the tooth plate 1 that fits together with crank gear axle 2, and above-mentioned axle is designed to be supported by the ball bearing of main shaft of cycle stand bottom.Being positioned near plate 1 periphery, radially being relatively fixed a little 3 and 4 is respectively two V-type branches 5 of foot-operated crank 7 and 6 end points, and the other end of branch 5 and 6 links together and be provided with axis hole with insertion stretcher axle.

Between pedal spindle 2 and the stretcher axis hole 8 apart from d and the length corresponding (17.5cm) of the foot-operated crank of tradition and as can be seen each foot-operated crank branch 5 and 6 length be 19cm, promptly length almost increases by 10%.Therefore, can understand, need not to revise the distance between pedal spindle and the stretcher axis hole and the rotation girth of avoiding increasing stretcher, the length of foot-operated crank increases a lot, thereby produces very big leverage effects, provides the power that increases to chain drive-belt.

In addition, can see, when the stretcher (not shown) on axis hole 8 applies a thrust, impose on plate 1 one pulling force by foot-operated crank branch 5, and impose on this plate one thrust by foot-operated crank branch 6 simultaneously, therefore very high efficient is provided.

Fig. 2 is shown with the improvement of foot-operated crank of the present invention, wherein foot-operated crank 7 ' two branches 5 ', 6 ' respectively originate in its be fixed to point 3 on the plate 1 ', 4 ', first section shape of bending in having to the inside of branch, and second section be similar to straight line and lump together and form public part 11, be provided with in its end stretcher axis hole 8 '.

In the above-described embodiments, only told about the part crank gear that is positioned at the cycle stand right side, certainly undoubtedly, left part comprises a plate that does not have tooth punching that is fitted together with pedal shaft gear, join above-mentioned foot-operated gear outside face to aforementioned foot-operated crank 7,7 ' in some identical foot-operated cranks.

Be readily appreciated that,, can structurally make increase or modification without prejudice to content of the present invention by the foregoing description that non-restrictive example is done.

Claims

1. a bicycle is ridden gear, comprise and be connected with tooth plate (1) and foot-operated crank (7,7 ') pedal shaft gear (2), one end of foot-operated crank is fixed to tooth plate (1) and goes up outer certain in pedal shaft gear (2) center on a bit, the other end is characterized in that foot-operated crank (7 as the support (8,8 ') of a pedal, 7 ') comprise two V-arrangement branches (5,6,5 ', 6 '), one end (8,8 ') be connected to each other with the installing stretcher, its other end separately be fixed to tooth plate (1) go up with pedal shaft gear (2) symmetrical two the point (3,4,3 ', 4 ') on.

2. according to the foot-operated gear of claim 1, be characterised in that with the axisymmetric foot-operated crank of foot-operated gear (2) (7,7 ') attachment point (3,4,3 ', 4 ') to be positioned near the periphery of tooth plate (1).

3. according to the foot-operated gear of claim 1 and 2, be characterised in that the length of the length of each foot-operated crank branch (5,6) greater than the foot-operated crank of tradition.

4. according to the foot-operated gear of above-mentioned each claim, be characterised in that foot-operated crank (7 ') two branches (5 ', 6 ') begin all to have interior to the inside curved shape from the point that is fixed on the tooth plate, then be actually straight line portion (11), the actual straight line portion of two branches links together and there is axis hole (8 ') its end to insert stretcher.

5. according to the foot-operated gear of above-mentioned each claim, be characterised in that it comprises, be fitted together with pedal shaft gear and be positioned at a plate on the tooth plate, be identical and be positioned at the foot-operated crank of latter's relative position with the foot-operated crank of above-mentioned V-type with it joins with respect to the cycle stand plane symmetry.