CN85201007Y - bicycle curve derailleur - Google Patents

Abstract

自行车曲线变速器是一种用于自行车的曲线变速驱动装置。它主要包括曲柄、中轴、特制曲线链轮、棘轮棘爪体***、摩擦子***和杠杆刹紧***。它们组成一体，安装在自行车中轴上代替现有的圆形大链轮。通过曲线链轮和调节曲线链轮与曲柄之间相对关系，可以达到省力，加速。它结构简单，可靠性高，造价低，寿命长，新老车辆均可安装，并推广应用于三轮车、人力机动两用车。骑行时节奏强，有明显的步行感。A bicycle curve derailleur is a curve shifting drive for bicycles. It mainly includes crank, middle axle, special curve sprocket, ratchet pawl body system, friction subsystem and lever braking system. They are integrated and installed on the bottom bracket of the bicycle in place of the existing large round chainrings. By adjusting the relative relationship between the curved sprocket and the crank, labor saving and acceleration can be achieved. The utility model has the advantages of simple structure, high reliability, low cost and long service life, which can be installed on both new and old vehicles, and is popularized and applied to tricycles and human-powered dual-purpose vehicles. The rhythm is strong when riding, and there is a clear sense of walking.

Description

本发明是用于自行车的一种曲线变速驱动装置。The present invention is a curved variable speed drive device for bicycles.

本发明作出以前，骑车人用脚蹬车蹬使曲柄作圆周运动，连接在曲柄上的圆形大链轮通过链条传递作用力（拉力）。目前自行车采用的链轮是圆形，具有相同半径，那么骑车人蹬力（圆周切向力）保持不变时，链条上传递的拉力也保持不变，驱动自行车主动轮（后轮）的力矩也是不变的。为适应各种骑行状况，如需改变驱动力矩，通常是采用安装在后轴上的变速装置，有的是采用塔轮结构，有的采用摩擦结构。采用塔轮结构需要配专用链条，用拨链器来实现变速（有级），结构较复杂，由于链齿较薄，寿命较短，价格也较贵。若采用摩擦结构，可靠性差，工艺要求高，制造成本高。因此，目前使用的自行车一般未装有变速装置。Before the invention was made, the cyclist used the pedals to make the crank make a circular motion, and the large circular sprocket connected to the crank transmitted the force (pulling force) through the chain. At present, the sprockets used in bicycles are circular and have the same radius. When the pedaling force (circumferential tangential force) of the cyclist remains unchanged, the pulling force transmitted on the chain also remains unchanged. The torque is also constant. In order to adapt to various riding conditions, if the driving torque needs to be changed, a speed change device installed on the rear axle is usually used, some use a tower wheel structure, and some use a friction structure. The tower wheel structure needs to be equipped with a special chain, and the derailleur is used to realize the speed change (stepped). If the friction structure is used, the reliability is poor, the process requirements are high, and the manufacturing cost is high. Therefore, currently used bicycles are generally not equipped with a shifting device.

本发明的目的是提供了一种自行车曲线变速驱动装置。当使用具有不同半径的主动曲线链轮时，在同样的蹬力作用下，链条上的拉力随着半径的变化而变化，并阶段性改变曲线链轮与曲柄之间相对关系，使链条拉力能随着骑车人最佳蹬力位置而变化，使骑车人能适应不同的路况，调节骑行速度，达到省力、舒适。The purpose of the present invention is to provide a bicycle curve shifting drive device. When using active curved sprockets with different radii, under the same pedaling force, the tension on the chain changes with the change of the radius, and changes the relative relationship between the curved sprocket and the crank in stages, so that the chain tension can be It changes with the optimal pedaling force position of the cyclist, so that the cyclist can adapt to different road conditions, adjust the riding speed, and achieve labor-saving and comfortable.

图1.曲线变速器侧视图图2.曲线变速器剖视图图3.链条防松装置本发明的要点在于曲线变速驱动装置，它包括：曲线链轮（2）曲柄（1）Figure 1. Side view of the curve speed changerFigure 2. Sectional view of the curve speed changerFigure 3. Chain anti-loosening device

中轴（8），以及用以安装曲线链轮和调节曲线链轮与曲柄之间相对关系的棘轮棘爪体***，增加棘轮与棘爪体之间摩擦力的摩擦子***，用以刹紧棘轮的杠杆刹紧***。The central shaft (8), and the ratchet pawl body system for installing the curved sprocket and adjusting the relative relationship between the curved sprocket and the crank, and the friction subsystem for increasing the friction force between the ratchet and the pawl body for braking Ratchet lever brake system.

曲线链轮的节线，可以是椭圆，卵圆等对转动中心具有不同半径的封闭曲线，曲线链轮的齿数可以是30至56齿之间的任何一个规格。曲线链轮（2）与棘轮（6）外壳固定在一起，棘爪体（9）则安装在曲柄（1）上，或直接安装在中轴（8）上，它们之间由保持架（12）、滚珠（13）安装成一体，装在自行车的原有主动链轮位置中轴（8）上，由于棘爪（7）的作用，曲柄（1）可以相对曲线链轮（2）作单向转动，反向则带动曲线链轮而传递驱动力。The pitch line of the curved sprocket can be an ellipse, an oval, etc., a closed curve with different radii for the center of rotation, and the number of teeth of the curved sprocket can be any specification between 30 and 56 teeth. The curved sprocket (2) is fixed with the shell of the ratchet (6), the pawl body (9) is mounted on the crank (1), or directly mounted on the central shaft (8), and the cage (12) is between them. ) and balls (13) are installed into one body and mounted on the central axle (8) of the original driving chain wheel of the bicycle. Due to the action of the pawl (7), the crank (1) can be used as a single relative to the curved chain wheel (2). Rotate in the opposite direction and drive the curved sprocket to transmit the driving force.

由于棘轮（6）与棘爪体（9）之间的摩擦很小，单向转动十分容易，不利于本发明的目的。为此，在棘轮和棘爪体之间装有增加摩擦力的摩擦子***，使曲柄与曲线链轮之间的单向转动必须克服一定的摩擦阻力，用以防止不需要变速时出现变速；该***是有数个摩擦子（11）和弹簧（10）来实现的。Since the friction between the ratchet wheel (6) and the pawl body (9) is very small, the unidirectional rotation is very easy, which is not conducive to the purpose of the present invention. For this reason, a friction subsystem that increases friction is installed between the ratchet and the pawl body, so that the one-way rotation between the crank and the curved sprocket must overcome a certain frictional resistance to prevent shifting when shifting is not required; The system is realized with several friction elements (11) and springs (10).

当需变速时，需把棘轮刹住，也即刹住曲线链轮，以便倒退曲柄，使它们之间相对关系改变，因此设置有刹紧棘轮的杠杆刹紧***，该***由安装在三角架上的杠杆（4）、杠杆能围绕一固定轴（14）旋转，杠杆头部有摩擦块（5）与安装在车把上的手把等组成，变速时，捏紧手把，手把牵动钢丝（3），钢丝拉动杠杆，摩擦块即刹紧在棘轮上，棘轮就不能转动，就能容易改变曲线链轮与曲柄的相对关系。When shifting is required, the ratchet needs to be braked, that is, the curved sprocket, so as to reverse the cranks and change the relative relationship between them. Therefore, a lever braking system for braking the ratchet is provided, which is installed on the tripod. The upper lever (4) and the lever can rotate around a fixed axis (14). The head of the lever is composed of a friction block (5) and a handlebar installed on the handlebar. When shifting, squeeze the handlebar tightly, and the handlebar pulls The steel wire (3), the steel wire pulls the lever, the friction block is braked tightly on the ratchet wheel, the ratchet wheel cannot rotate, and the relative relationship between the curved sprocket and the crank can be easily changed.

本发明是方便地改变曲线链轮与曲柄之间的相对关系，与原有技术相比，能适应不同路况，骑行省力。它结构较简单，可靠性高，制造成本低，售价也较低，寿命长，新车可以使用，旧车也极易改装，并可推广应用于三轮车，人力机动两用车。骑行时节周强，有明显的步行感。The present invention conveniently changes the relative relationship between the curved chain wheel and the crank, and compared with the prior art, it can adapt to different road conditions and save labor when riding. The utility model has the advantages of simple structure, high reliability, low manufacturing cost, low price and long service life. During the riding season, Zhou Qiang has a clear sense of walking.

本发明典型实施介绍：图1.曲线变速器侧视图图2.曲线变速器剖视图图3.链条防松装置曲线链轮（2）与棘轮（6）刚性固定，实施例中，曲线链轮的节线是椭圆，棘爪体（9）与曲柄（1）刚性紧固，它们之间由滚珠（13）、保持架（12）安装在一起由于有棘爪（7）的作用，棘爪体（9）只能单向相对棘轮转动，它们安装在自行车中轴（8）上，代替原有的曲柄和圆形的链轮。为了增加棘轮与棘爪体之间的阻力，设置有数个摩擦子（11），用弹簧自动压紧。安装在自行车车架的三角架上，调节刹紧***包括固定在车把上的手把，牵紧钢丝（3），杠杆（4），轴芯（14），摩擦块（5）组成。当需调速时，捏紧手把，拉紧钢丝（3），牵动杠杆围绕轴芯转动，杠杆头部的摩擦块（5）刹紧棘轮，使棘轮不能转动。倒退曲柄时需用力克服摩擦子的阻力，曲柄相对椭圆链轮转动，到需要位置后，松开手把，并停止倒退，即可继续用力蹬车前进。Introduction to the typical implementation of the present invention: Fig. 1. Side view of the curve derailleurFig. 2. Cross-sectional view of the curve derailleurFig. 3. The chain anti-loosening device The curve sprocket (2) and the ratchet (6) are rigidly fixed. In the embodiment, the pitch line of the curve sprocket It is an ellipse, the pawl body (9) and the crank (1) are rigidly fastened, and the balls (13) and the cage (12) are installed between them. Due to the action of the pawl (7), the pawl body (9). ) can only rotate relative to the ratchet wheel in one direction, and they are installed on the bicycle center axle (8) to replace the original crank and circular sprocket. In order to increase the resistance between the ratchet wheel and the pawl body, several friction elements (11) are provided, which are automatically pressed by springs. Installed on the tripod of the bicycle frame, the adjusting brake system includes a handlebar fixed on the handlebar, a tension wire (3), a lever (4), a shaft core (14), and a friction block (5). When the speed needs to be adjusted, pinch the handle tightly, pull the steel wire (3), and pull the lever to rotate around the shaft core, and the friction block (5) on the head of the lever brakes the ratchet, so that the ratchet cannot rotate. When reversing the crank, it is necessary to overcome the resistance of the friction. The crank rotates relative to the elliptical sprocket. After reaching the required position, release the handlebar and stop reversing, and then continue to pedal hard.

为了减少链条的晃动，在自行车中后轴之间的车架上可以安装链条松紧调节装置（见图3）。To reduce chain wobble, a chain slack adjuster can be installed on the frame between the rear axles in the bicycle (see Figure 3).

为提高曲线变速器的使用寿命，同样可以安装全链罩，全链罩的大端尺寸需根据曲线链轮作些放大或选择适当的曲线链轮而不改变全链罩尺寸。In order to improve the service life of the curve derailleur, the full chain cover can also be installed. The size of the big end of the full chain cover should be enlarged according to the curved chain sprocket or an appropriate curved chain wheel should be selected without changing the size of the full chain cover.

本发明制造材料完全采用钢。The manufacturing material of the present invention is completely made of steel.

Claims (10)

1.一种包括曲柄(1)和中轴(8)用于自行车的曲线变速驱动装置，本发明特征是具有一个曲线链轮(2)及用以安装曲线链轮和调节曲线链轮与曲柄之间相对关系的棘轮棘爪体***，增加棘轮与棘爪体之间摩擦力的摩擦子***。用以刹紧棘轮的杠杆刹紧***，它们装配成一体，安装在自行车的中轴和三角架上，代替原有的圆形链轮。1. A curvilinear speed change drive device comprising a crank (1) and a central axle (8) for a bicycle, the present invention is characterized by having a curvilinear sprocket (2) and for installing the curvilinear chain wheel and adjusting the curvilinear chain wheel and the crank The relative relationship between the ratchet and pawl body system is a friction subsystem that increases the friction force between the ratchet and the pawl body. The lever brake system used to brake the ratchet is assembled into one piece and installed on the central axle and tripod of the bicycle, replacing the original circular sprocket. 2.据权利要求1所述的曲线变速器，其特征是所述的曲线链轮的节线可以是椭圆、卵圆等对转动中心具有不同半径的封闭曲线。2. The curvilinear transmission according to claim 1, wherein the pitch line of the curvilinear sprocket can be an ellipse, an oval, etc., a closed curve having different radii for the center of rotation. 3.据权利要求1或2所述的曲线变速器，其特征是所述曲线链轮的齿数有30至56齿不等的各种规格。3. The curvilinear transmission according to claim 1 or 2, characterized in that the number of teeth of the curvilinear sprocket has various specifications ranging from 30 to 56 teeth. 4.据权利要求1所述的曲线变速器，其特征是所述棘轮棘爪体***包括曲线链轮与棘轮固定在一起，棘爪体则固定在曲柄上，或直接安装在中轴上，它们由滚珠，保持架安装在一起，由于棘爪的作用，曲柄可以相对曲线链轮作单向转动。4. The curve derailleur according to claim 1, characterized in that the ratchet pawl body system comprises a curved sprocket and the ratchet wheel fixed together, and the pawl body is fixed on the crank, or directly mounted on the central shaft, and they are The balls and the cage are installed together. Due to the action of the pawl, the crank can rotate in one direction relative to the curved sprocket. 5.据权利要求1所述的曲线变速器，其特征是所述的摩擦子***是用数个摩擦子和弹簧来实现的。5. The curve transmission according to claim 1, wherein the friction subsystem is realized by a plurality of friction elements and springs. 6.据权利要求1所述的曲线变速器，其特征是所述的杠杆刹紧***，该***由安装在车把上的手把，牵紧钢丝，安装在三角架上的杠杆，轴芯，杠杆头部的摩擦块组成。6. The curve derailleur according to claim 1, characterized in that the lever braking system consists of a handle mounted on the handlebar, a tension wire, a lever mounted on a tripod, a shaft core, The friction block on the head of the lever is composed. 7.据权利要求1所述的曲线变速器，其特征是所述的三角架上还可安装链条松紧调节装置。7. The curve derailleur according to claim 1, wherein a chain tension adjusting device can also be installed on the tripod. 8.据权利要求1所述的曲线变速器，其特征是还可以适当加大全链罩的大端尺寸。8. The curve derailleur according to claim 1, characterized in that the size of the big end of the full chain cover can be appropriately increased. 9.据权利要求1至8所述的曲线变速器，其特征是材料完全由钢制成。9. A curvilinear transmission as claimed in claims 1 to 8, characterized in that the material is made entirely of steel. 10.据权利要求1所述的曲线变速器，其特征是所述曲线变速器也适用三轮车，人力机动两用车。10. The curve transmission according to claim 1, characterized in that the curve transmission is also suitable for tricycles and human-powered dual-purpose vehicles.