Labor-saving driving device of bicycle

Abstract

The utility model discloses a labor-saving driving device of a bicycle. The labor-saving driving device comprises a middle shaft; the guide rail discs are installed at the two ends of the middle shaft respectively, each guide rail disc is provided with a guide rail groove, each guide rail groove is composed of a semi-ellipse and a semi-circle, and one end of each semi-ellipse is in the advancing direction of the bicycle; the telescopic foot bar is installed on the outer side of the guide rail disc, the telescopic foot bar further comprises a sliding seat, and the sliding seat is installed at the end of the middle shaft; one end of the first crank is inserted into the sliding seat, and the other end of the first crank is connected with the guide rail groove through a rolling bearing; the third crank is mounted at one end, connected with the guide rail groove, of the first crank; and the pedal is mounted at the tail end of the crank connecting piece. According to the lever principle, the length of a force arm is increased, and therefore the labor-saving effect is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of bicycles, in particular to a labor-saving driving device for a bicycle. Background Art

[0002] Bicycles are an indispensable means of transportation in low-carbon life, and even gave rise to many cycling enthusiasts.

[0003] The power of a bicycle comes from the human body, and for children and the elderly, it is necessary to reduce their physical exertion when riding, especially for the elderly. However, the existing labor-saving structure of bicycles is often realized by a complex gear set, which is costly, or the labor-saving effect is achieved by increasing the pedaling arm through the lever principle, such as CN107618609A. However, this patented technical solution does not take into account the stress of the structure itself, especially when there is only one crank, which leads to a large force between the components and an unstable structure. At the same time, the force between the components also causes friction loss to the components themselves. Therefore, it is very beneficial to invent a labor-saving driving device for a bicycle. Utility Model Content

[0004] The purpose of the utility model is to provide a labor-saving driving device for a bicycle in view of the defects of the prior art. Through the lever principle, the pedaling force arm is lengthened to achieve the purpose of labor saving. Moreover, through the double-rod telescopic pedal rod, the longitudinal torque between the crank and the slide cylinder during riding is reduced, thereby achieving the purpose of more labor saving and extending the life of components.

[0005] The utility model provides a labor-saving driving device for a bicycle, comprising: a middle axis; a guide rail plate, wherein the guide rail plates are respectively installed at two ends of the middle axis, the guide rail plate has a guide rail groove, the shape of the guide rail groove is composed of a semi-ellipse and a semi-circle, and one end of the semi-ellipse is the forward direction of the bicycle; a telescopic pedal, wherein the telescopic pedal is installed on the outer side of the guide rail plate, and the telescopic pedal also includes: a sliding seat, wherein the sliding seat is installed at the end of the middle axis, and the sliding seat also includes a first slide cylinder and a second slide cylinder; a first crank, wherein one end of the first crank is inserted into the first slide cylinder; a second crank, wherein one end of the second crank is inserted into the second slide cylinder; a crank connecting piece, wherein the crank connecting piece is fixedly connected to the other end of the first crank, and the crank connecting piece is fixedly connected to the other end of the second crank; a rolling bearing, wherein the rolling bearing is installed in the guide rail groove, and one end of the rolling bearing is fixedly connected to the crank connecting piece; a pedal, wherein the pedal is installed at the end of the crank connecting piece.

[0006] Furthermore, it also includes: a mounting seat, which is installed in the middle of the two guide rail plates with the central axis as the axis.

[0007] The beneficial effects of the utility model are:

[0008] 1. The double-rod telescopic pedal avoids excessive longitudinal and axial torque on a crank during riding, and at the same time prolongs the life of the components. The axial torque causes the crank to rotate in the slide, and the longitudinal torque causes the crank to break or deform.

[0009] 2. The circular motion trajectory of the foot is changed into a motion trajectory composed of a semi-ellipse and a semi-circle through the guide plate, wherein the semi-ellipse is the motion trajectory of the foot moving from the highest point to the lowest point. Since the distance between the points on the semi-ellipse trajectory and the central axis is longer than that of the semicircle, according to the principle of leverage, the length of the force arm is increased, thereby achieving a labor-saving effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a schematic diagram of the structural disassembly of Embodiment 1 of the present utility model;

[0011] Figure 2 This is a schematic diagram of the three-dimensional structure of Example 1 of the utility model;

[0012] Figure 3 This is a front structural schematic diagram of Example 1 of the utility model;

[0013] Reference numerals: 1-central axis; 2-guide plate; 21-guide groove; 3-telescopic pedal; 31-sliding seat; 311-first slide cylinder; 312-second slide cylinder; 32-first crank; 33-second crank; 34-crank connecting member; 4-rolling bearing; 5-pedal; 6-mounting seat; DETAILED DESCRIPTION

[0014] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0015] Example 1

[0016] refer to Figure 1-3 , provides a labor-saving driving device for a bicycle, comprising:

[0017] The middle shaft 1 is connected with the chainring.

[0018] The guide rail disc 2 is respectively installed at both ends of the middle shaft 1. The guide rail disc 2 has a guide rail groove 21. The shape of the guide rail groove 21 is composed of a semi-ellipse and a semi-circle, and one end of the semi-ellipse is the forward direction of the bicycle.

[0019] A telescopic pedal 3, which is installed on the outer side of the guide rail plate 2, and the telescopic pedal 3 also includes: a sliding seat 31, which is installed on the end of the central axis 1, and the sliding seat 31 also includes a first slide cylinder 311 and a second slide cylinder 312; a first crank 32, one end of the first crank 32 is inserted into the first slide cylinder 311; a second crank 33, one end of the second crank 33 is inserted into the second slide cylinder 312; a crank connector 34, the crank connector 34 is fixedly connected to the other end of the first crank 32, and the crank connector 34 is fixedly connected to the other end of the second crank 33.

[0020] The rolling bearing 4 is installed in the guide rail groove 21 , and one end of the rolling bearing 4 is fixedly connected to the crank connector 34 .

[0021] The pedal 5 is mounted on the end of the crank connector 34 .

[0022] The mounting seat 6 is mounted in the middle of the two guide rail plates 2 with the central axis 1 as the axis. The mounting seat 6 mainly plays the role of reinforcing the structure.

[0023] Since one end of the telescopic pedal 3 is fixed on the central axis 1, and the other end limits the motion trajectory within the guide groove 21 through the rolling bearing 4, and the shape of the guide groove 21 is a combination of a semi-ellipse and a circle, and the semi-ellipse portion of the guide groove 21 is located in the forward direction of the bicycle, which is exactly the half circle of the foot stepping down. Because the telescopic pedal 3 will extend in length when moving along the semi-ellipse, according to the principle of leverage, the force arm is extended, thereby achieving the purpose of saving effort.

[0024] The telescopic pedal rod 3 includes two cranks, a first crank 32 and a second crank 33. This is because: if there is only one crank, when the foot does work on the pedal 5, axial torque and longitudinal torque will be generated on the crank. The axial torque will produce a tendency to rotate around its own central axis, and the longitudinal torque will cause the crank to have a tendency to break or deform, and this tendency needs to be overcome by the fixing effect of other components. However, this patent uses the first crank 32 and the second crank 33, so there is no tendency for one crank to rotate by itself, and the structure is relatively strong. Therefore, no additional work is required to overcome it, thereby achieving a labor-saving effect and extending the life of the components.

[0025] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A labor-saving driving device for a bicycle, characterized in that: include: Central axis (1); A guide rail plate (2), the guide rail plate (2) being respectively mounted on both ends of the middle shaft (1), the guide rail plate (2) having a guide rail groove (21), the shape of the guide rail groove (21) being composed of a semi-ellipse and a semi-circle, and one end of the semi-ellipse is in the forward direction of the bicycle; A telescopic pedal (3), wherein the telescopic pedal (3) is installed on the outer side of the guide rail plate (2), and the telescopic pedal (3) further comprises: A sliding seat (31), the sliding seat (31) being mounted on the end of the central shaft (1), the sliding seat (31) further comprising a first sliding cylinder (311) and a second sliding cylinder (312); a first crank (32), one end of the first crank (32) being inserted into the first slide cylinder (311); a second crank (33), one end of the second crank (33) being inserted into the second slide cylinder (312); a crank connecting member (34), the crank connecting member (34) being fixedly connected to the other end of the first crank (32), and the crank connecting member (34) being fixedly connected to the other end of the second crank (33); a rolling bearing (4), the rolling bearing (4) being installed in the guide rail groove (21), and one end of the rolling bearing (4) being fixedly connected to the crank connecting member (34); A pedal (5), wherein the pedal (5) is mounted on the end of the crank connecting member (34).

2. A labor-saving driving device for a bicycle according to claim 1, characterized in that: Also includes: A mounting seat (6), wherein the mounting seat (6) is mounted in the middle of the two guide rail plates (2) with the central axis (1) as the axis.

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