CN203623892U - Reciprocating swing driving device for crankshafts in bicycle - Google Patents

Abstract

A crank reciprocating swing driving device in a bicycle belongs to the technical field of manpower vehicles. There is a driving blank area in the existing drive device. The utility model includes an active part and a driven part, and the two parts are connected by an endless chain; there are two identical cranks in the active part, and a pedal is installed on the outer end of each crank, and the central axis passes through the bushing , cooperate with the shaft sleeve through the bearing; on one side of the central axis, a large cone is fixedly installed between the side crank and the side bearing; the inner ends of the two cranks in the active part are respectively installed in the middle through the ratchet mechanism At both ends of the shaft, the two ratchet mechanisms turn in opposite directions; on each crank, one end of the hinge is hinged to the crank, and the other ends of the two hinges are connected to the two ends of the same cable, and the cable bypasses the fixed part above the active part. Pulley; the top dead center of the crank swing is at 11 o'clock on the clock, and the bottom dead center is at 7 o'clock on the clock. When one crank swings to the top dead center, the other crank swings to the bottom dead center.

Description

Crank reciprocating oscillating drive in bicycles

technical field

The utility model relates to a crank reciprocating swing driving device in a bicycle, which can avoid the driving blank area existing in the crank rotation drive, and two cranks alternately work in the effective driving area to obtain full-time driving force, belonging to the technical field of human transportation tools .

Background technique

The driving device in the existing bicycle is a double crank single flywheel chain mechanism, and is divided into a driving part and a driven part, and the two parts are connected by a chain. In the active part of the mechanism, two cranks are distributed at an angle of 180° to each other. The inner end of one crank is fixedly installed on one end of the central axis, and the inner end of the other crank is fixedly installed on the other end of the central axis. A pedal is installed at the outer end of the crank; the central shaft passes through the axle sleeve, and cooperates with the axle sleeve through a bearing; on one side of the central shaft, a large cone is fixedly installed between the side crank and the side bearing. In the driven part of the mechanism, the flywheel is installed on the shaft skin of the bicycle drive wheel, and the outer circumference of the flywheel is distributed with the same gear teeth as the teeth of the large toothed wheel, forming a small tooth integrated with the flywheel. wheel. The disk surface of the small cone and the large cone is coplanar, and an endless chain is lapped on the large cone and the small cone simultaneously. During the working process of the mechanism, manpower is alternately applied to the pedals of the two cranks, and the two cranks rotate synchronously and in the same direction with the central axis as the axis, and the large toothed wheel rotates accordingly, and the small toothed wheel and the flywheel are driven to rotate in the same direction through the chain. , and finally the driving force is transmitted to the bicycle driving wheel through the axle skin. The main disadvantage of the existing driving device is that there is a driving blank area. This is described below in conjunction with the division of the clock face. No matter which crank, in its 360° stroke, only the 120° counterclockwise stroke from 7 o'clock to 11 o'clock can effectively apply manpower to the pedals, even if two cranks Cooperating with alternating force, 5 o'clock to 7 o'clock, 11 o'clock to 1 o'clock, a total of 120° stroke is still a complete driving blank area. When the driving device is in the state of the driving blank area, the vehicle actually moves forward by inertia. The driving blank area shows that the driving of the vehicle is intermittent rather than continuous in terms of time. When the vehicle is going uphill, facing the wind or carrying a load, or encounters muddy, soft, bumpy or rough road conditions, intermittent Driving often leads to failure to drive normally.

Utility model content

In order to obtain a bicycle driving device capable of continuous driving, we invented a crank reciprocating swing driving device in a bicycle.

The crank reciprocating swing driving device in the bicycle of the utility model includes an active part and a driven part, and the two parts are connected by an endless chain; there are two identical cranks in the active part, and the outer ends of each crank are installed A pedal; the central shaft passes through the shaft sleeve, and the bearing is matched with the shaft sleeve; on one side of the central shaft, a large cone is fixedly installed between the side crank and the side bearing; it is characterized in that two of the active parts The inner ends of the cranks are respectively installed on the two ends of the central shaft through the ratchet mechanism, and the two ratchet mechanisms turn in opposite directions; on each crank, one end of the hinge is hinged with the crank, and the other end of the two hinges is connected to the same cable. At both ends, the cable goes around the fixed pulley above the active part; according to the division of the clock face, the top dead center of the crank swing is at 11 o'clock, and the bottom dead center is at 7 o'clock. When a crank swings to the top dead center , the other crank swings to bottom dead center.

The technical effect of the solution of the utility model is that since the crank is connected with the central shaft through a ratchet mechanism, when manpower is applied to the pedal to drive a crank to move from the top dead center to the bottom dead center, the crank drives the central shaft to rotate, and at the same time the Pull the other crank to move from the bottom dead center to the top dead center, because the two ratchet mechanisms turn in the opposite direction. In the mechanism, the pawl slides over the tooth backs of the ratchet wheel, so the crank does not act on the central axis. Afterwards, when manpower is applied to another pedal to drive another crank, the working condition is opposite to that described above, which forms a working process in which the two cranks reciprocate up and down to alternately and continuously drive the central axis to rotate, without involving driving blanks district. Although one crank is intermittently driving the center shaft to rotate, the driving process of the two cranks is seamlessly connected to form a full-time driving force. Drive the bicycle continuously. The purpose of the utility model is realized.

Description of drawings

Fig. 1 is the general structure of the present utility model and the distribution situation schematic diagram in the bicycle. Fig. 2 is a schematic diagram of the structure of the active part in the utility model, and this figure also serves as a summary accompanying drawing. Fig. 3 is a partially enlarged schematic view of the structure of the ratchet mechanism in the active part of the present invention. Fig. 4 is a partially enlarged schematic diagram of the connection structure between the cable and the crank in the active part of the present invention. Fig. 5 is a partial enlarged schematic diagram of the structural relationship between the cable and the fixed pulley in the active part of the utility model and the example structure of the pulley scheme. Fig. 6 is a schematic diagram of the driving condition of the crank reciprocating swing in the active part of the utility model.

Detailed ways

The crank reciprocating swing driving device in the bicycle of the present utility model comprises a driving part and a driven part, and these two parts are connected by an endless chain 1, as shown in Figure 1 . There are two identical cranks 2 in the active part, as shown in Figure 1 and Figure 2, a pedal 3 is installed on the outer end of each crank 2, the central shaft 4 passes through the bushing 5, and the bearing and bushing 5 Cooperate. On one side of the central axis 4, a bull cone 6 is fixedly installed between the side crank 2 and the side bearing, as shown in Figure 1 . The respective inner ends of the two cranks 2 in the active part are installed on the two ends of the central shaft 4 through the ratchet mechanism 7 respectively, as shown in FIG. 2 , the two ratchet mechanisms 7 turn in opposite directions. The ratchet mechanism 7 is an internal meshing type, as shown in FIG. 3 , and the ratchet 8 is fixedly connected to the inner end of the crank 2, and the ratchet 9 is fixedly connected to the end of the central shaft. On each crank 2, one end of the hinge 10 is hinged with the crank 2, and the other ends of the two hinges 10 are connected to the two ends of the same drag cable 11, as shown in Figure 1, Figure 2, and Figure 4, the drag cable 11 bypasses The fixed pulley 12 positioned on the top of the active part is as shown in Figure 2. The pulley frame 13 of fixed pulley 12 is fixed on the bicycle frame, as shown in Figure 1. Described fixed pulley 12 has two, as shown in Figure 1, Figure 5, two fixed pulleys 12 are identical, and two fixed pulleys 12 are installed side by side on the pulley frame 13, and a fixed pulley 12 is close to a crank 2, and another fixed pulley 12 The pulley 12 is close to the other crank 2. Fixed pulley 12 diameters are 30mm. Stay cable 11 adopts the steel wire rope that diameter is 2mm. According to the division of the clock face, the top dead center of crank 2 is at 11 o'clock, and the bottom dead center is at 7 o'clock. When one crank 2 swings to top dead center, the other crank 2 swings to bottom dead center, as shown in the figure Shown in 6; The stroke of ratchet 2 is 120 °.

Claims (5)

1. A crank reciprocating swing driving device in a bicycle, comprising a driving part and a driven part, which are connected by an endless chain; two identical cranks (2) are arranged in the driving part, and each crank A pedal is installed at the outer end of (2); the central shaft passes through the axle sleeve, and cooperates with the axle sleeve through the bearing; on one side of the central shaft, a large cone is fixedly installed between the side crank (2) and the side bearing; its It is characterized in that the respective inner ends of the two cranks (2) in the active part are respectively installed on the two ends of the central shaft through ratchet mechanisms (7), and the two ratchet mechanisms (7) turn in opposite directions; each crank (2) ), one end of the hinge is hinged with the crank (2), and the other ends of the two hinges are connected to the two ends of the same cable, and the cable bypasses the fixed pulley (12) above the active part; according to the division of the clock face, the crank (2) The top dead center of the swing is at 11 o'clock, and the bottom dead center is at 7 o'clock. When one crank (2) swings to the top dead center, the other crank (2) swings to the bottom dead center. the 2. The crank reciprocating swing driving device in the bicycle according to claim 1, characterized in that, the ratchet mechanism (7) is an internal engagement type, and the pawl (8) is fixedly connected to the inner end of the crank (2) , the ratchet (9) is affixed to the end of the central axis. the 3. The crank reciprocating swing driving device in the bicycle according to claim 1, characterized in that, the pulley frame (13) of the fixed pulley (12) is fixed on the bicycle frame. the 4. The crank reciprocating swing driving device in the bicycle according to claim 1, characterized in that, there are two fixed pulleys (12), the two fixed pulleys (12) are the same, and the two fixed pulleys (12) are juxtaposed Be installed on the pulley frame (13), a fixed pulley (12) is close to a crank (2), and another fixed pulley (12) is close to another crank (2). the 5. The crank reciprocating swing driving device in the bicycle according to claim 1, characterized in that the stroke of the ratchet (2) is 120°. the

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