CN219948476U - Belt pulley protection device and bicycle - Google Patents

Abstract

The utility model belongs to the technical field of bicycles and relates to a belt pulley protection device and a bicycle, wherein the belt pulley protection device comprises a tension pulley assembly for adjusting the tension of a belt body, the tension pulley assembly comprises a tension pulley body, a first connecting piece and a second connecting piece, the tension pulley body is rotatably arranged at the rear end of the first connecting piece, the first connecting piece and the second connecting piece are rotatably connected together through an elastic adjusting unit, the second connecting piece is fixed with a frame of the bicycle, and the tension pulley body automatically compresses the belt body to automatically adjust the tension of the belt body; the belt pulley assembly has the beneficial effects that in the damping process of the soft tail bicycle, the elastic adjusting unit of the tension pulley assembly can automatically adjust the position of the tension pulley body, so that the tension degree of the belt body is adjusted, the belt body is normally meshed with the fluted disc and the flywheel, the belt body is prevented from falling off, and the working stability of the belt body is greatly improved.

Description

Belt pulley protection device and bicycle

Technical Field

The utility model relates to the technical field of bicycles, in particular to a belt pulley protection device and a bicycle.

Background

Existing bicycles are generally classified into chain drive bicycles and pulley drive bicycles. Compared with a chain transmission system, the belt pulley transmission system has the advantages of difficult chain release, high speed, no sliding, high efficiency, long service life, space saving, low noise, large speed ratio, light weight, no need of adding lubricant, clean maintenance and the like.

For the soft tail belt bicycle adopting the frame shock absorbing system, the distance between the axle center of the rear wheel and the pedal center is continuously changed in the shock absorbing process, so that the belt is difficult to maintain proper tension, and the meshing degree with the fluted disc and the flywheel is poor, and is easy to loosen and slip. It is necessary to develop a device that automatically adjusts the belt tension.

Disclosure of Invention

First, the technical problem to be solved

In view of the above-mentioned shortcomings and disadvantages of the prior art, the present utility model provides a belt pulley protection device and a bicycle, which solves the technical problem that the belt is easy to loose and slip due to insufficient tension in the damping process of the existing soft tail belt bicycle adopting a frame damping system.

(II) technical scheme

In order to achieve the above purpose, the main technical scheme adopted by the utility model comprises the following steps:

in a first aspect, an embodiment of the present utility model provides a pulley protection device, suitable for a pulley-driven bicycle, including a tension pulley assembly for adjusting a tension of a belt body;

the tensioning wheel assembly comprises a tensioning wheel body, a first connecting piece and a second connecting piece, wherein the tensioning wheel body is rotatably arranged at the rear end of the first connecting piece, the first connecting piece and the second connecting piece are rotatably connected together through an elastic adjusting unit, the second connecting piece is fixed with a frame of a bicycle, and the tensioning wheel body automatically compresses the belt body to adjust the tightness of the belt body.

Optionally, the elastic adjusting unit comprises a shell, a rotating rod and an elastic device, wherein the rotating rod and the elastic device are rotatably installed in the shell, the end parts of the elastic device are fixedly connected with the rotating rod, the rotation centers of the elastic device and the rotating rod are the same, and the first connecting piece is fixedly connected with the rotating rod through a bolt.

Optionally, the elastic device is a torsion spring, the torsion spring is fixed in the shell and sleeved on the rotating rod, and the torsion arm of the torsion spring is fixedly connected with the rotating rod; or the elastic device is a spring, and the inner end of the spring is fixedly connected with the rotating rod.

Optionally, protrusions are provided on both side end surfaces of the tensioning wheel body along a diameter direction thereof to form guide grooves on a wheel surface contacting with the belt body.

Optionally, the pulley protection device further comprises a pinch roller assembly for preventing the belt body from falling off from the flywheel of the bicycle, the pinch roller assembly comprises a pinch roller body, a pinch roller mounting shaft and a fixing piece, the pinch roller body is rotatably arranged at one end of the pinch roller mounting shaft, the other end of the pinch roller mounting shaft is fixedly connected with the fixing piece, the fixing piece is arranged on the frame of the bicycle, and the pinch roller body is close to the belt body at the meshing position of the flywheel.

Optionally, the fixing piece is provided with an adjusting hole at a position opposite to the pressing wheel mounting shaft, the adjusting hole is drum-shaped, and the pressing wheel mounting shaft is arranged in the adjusting hole and is connected with the fixing piece through a bolt.

In a second aspect, embodiments of the present utility model provide a bicycle, the bicycle comprising a frame, a wheel set, a transmission mechanism and the aforementioned protection device;

the frame comprises a front triangle, a rear upper fork and a rear lower fork which are matched with each other, the transmission mechanism comprises a belt body, a dental disc group and a flywheel, the dental disc group is rotatably arranged at the lower part of the front triangle through a mandrel, the dental disc group is fixed with the mandrel, a second connecting piece of the tensioning wheel assembly is fixed with the lower part of the front triangle, and the tensioning wheel body of the tensioning wheel assembly is arranged at a position between the dental disc group and the flywheel and is abutted against the outer side surface of the belt body;

the wheel set comprises a wheel hub, the flywheel is fixed with the wheel hub, the wheel hub is arranged at the rear end opposite to the rear upper fork through the rotation of the wheel shaft, a lifting lug is arranged between the rear upper fork and the flywheel, and a fixing piece of the compression wheel assembly is fixedly connected with the lifting lug.

(III) beneficial effects

The beneficial effects of the utility model are as follows:

1. according to the belt pulley protection device and the bicycle, the belt pulley protection device of the bicycle adopts the tension pulley assembly, the elastic adjusting unit of the tension pulley assembly can automatically adjust the position of the tension pulley body, and further adjust the tension of the belt body, so that the belt body can be normally meshed with the fluted disc and the flywheel in the damping process of the soft tail bicycle, the belt body is prevented from falling off, the working stability of the belt body is greatly improved, the abrasion to the belt body is reduced, and the service life of the belt body is prolonged.

2. The belt pulley protection device adopts the tension pulley component and the compression pulley component, and when adjusting the tension degree of the belt body, the belt body at the meshing position of the belt body and the flywheel is also compressed and protected, so that the belt body and the flywheel are meshed and matched in the bicycle shock absorbing process, and the belt body is not easy to slip.

Drawings

FIG. 1 is a schematic diagram of a pulley protector and pulley protector assembly of example 1 of a bicycle in accordance with the present utility model;

FIG. 2 is a second schematic diagram of an assembly of a pulley protector and a pulley protector of example 1 of a bicycle in accordance with the present utility model;

FIG. 3 is a perspective view of a pulley protector and tensioner assembly of the pulley protector of example 1 of a bicycle in accordance with the present utility model;

FIG. 4 is a schematic cross-sectional view of a pulley protector and tensioner assembly of example 1 of a bicycle in accordance with the present utility model;

FIG. 5 is a schematic perspective view of a pulley protector and pinch roller assembly of the pulley protector of example 1 of a bicycle in accordance with the present utility model;

fig. 6 is a perspective view (partially) of a pulley protector and a bicycle according to embodiment 2 of the present utility model.

[ reference numerals description ]

1. A frame; 11. a head pipe; 12. an upper pipe; 13. a lower pipe; 14. a riser; 15. a rear fork; 16. a rear lower fork; 17. lifting lugs;

2. a wheel set; 21. a rim; 22. a hub;

3. a drive assembly;

4. a transmission mechanism; 41. a dental tray set; 42. a flywheel; 43. a belt body;

51. a tensioner assembly; 511. a tensioning wheel body; 512. a first connector; 513. a second connector; 514. an elastic adjusting unit; 5141. a housing; 5142. a rotating rod;

52. a pinch roller assembly; 521. a pinch roller body; 522. a compression wheel mounting shaft; 523. a fixing member; 5231. and adjusting the hole.

Detailed Description

The utility model will be better explained by the following detailed description of the embodiments with reference to the drawings. Where references herein to "up", "down",. And the like are made with reference to the orientation of fig. 1, where the orientation of the dental tray set 41 is "down", the orientation of the upper tube 12 is "up", the orientation of the dental tray set 41 is "forward", and the orientation of the flywheel 42 is "rear".

The belt pulley protection device comprises a tension pulley assembly for adjusting the tension of a belt body, wherein the tension pulley assembly comprises a tension pulley body, a first connecting piece and a second connecting piece, the tension pulley body is rotatably arranged at the rear end of the first connecting piece, the first connecting piece and the second connecting piece are rotatably connected together through an elastic adjusting unit, the second connecting piece is fixed with a frame of the bicycle, and the tension pulley body automatically compresses the belt body to adjust the tension of the belt body; compared with the prior art, because the belt pulley protection device of the bicycle adopts the tension pulley assembly, in the damping process of the soft tail bicycle, the elastic adjusting unit of the tension pulley assembly can automatically adjust the position of the tension pulley body, so as to adjust the tension of the belt body, ensure that the belt body is normally meshed with the fluted disc and the flywheel, prevent the belt body from falling off, greatly improve the working stability of the belt body, reduce the abrasion to the belt body and prolong the service life of the belt body.

In order that the above-described aspects may be better understood, exemplary embodiments of the present utility model will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present utility model are shown in the drawings, it should be understood that the present utility model may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the utility model to those skilled in the art.

Example 1:

referring to fig. 1 and 2, the present embodiment provides a pulley protection device, which is suitable for a belt-driven bicycle, and includes a tension pulley assembly 51 for adjusting the tension of a belt body 43.

Referring to fig. 2, the tension pulley assembly 51 includes a tension pulley body 511, a mounting member, a first connecting member 512 and a second connecting member 513, wherein the tension pulley body 511 is rotatably disposed on the mounting member, the mounting member is fixedly connected with one end of the first connecting member 512, and the other end of the first connecting member 512 is rotatably connected with the second connecting member 513 through an elastic adjusting unit 514. The second connecting member 513 is fixed to the frame 1 of the bicycle. Therefore, in the shock absorbing process of the bicycle, the elastic adjusting unit 514 of the tension pulley assembly 51 can automatically adjust the position of the tension pulley body 511, so that the tension pulley body 511 presses the outer side surface of the belt body 43, and adjust the tension of the belt body 43, so that the belt body 43 is normally meshed with the fluted disc and the flywheel 42.

Specifically, as shown in fig. 3 and 4, the mounting member includes an internally threaded rod and a bolt, which are screwed together, and the tension pulley body 511 is rotatably provided on the internally threaded rod. The internal threaded rod is fixedly connected with the first connecting member 512 through bolts. The tensioning wheel body 511 is provided with protrusions on both side end surfaces along a diameter direction thereof to form guide grooves on the wheel surface contacting with the belt body 43, and the belt body 43 is placed in the guide grooves to move, so that a displacement problem is not easy to occur.

Referring to fig. 4, the elastic adjusting unit 514 includes a housing 5141, a rotating lever 5142 rotatably installed in the housing 5141, and an elastic means. The first connecting member 512 is fixedly coupled to the rotating lever 5142 by a bolt. The end of the elastic device is fixedly connected with the rotating rod 5142, and the end of the elastic device and the rotating rod 5142 have the same rotation center, so that the elastic device provides torsion for the rotation of the rotating rod 5142, the position of the tensioning wheel body 511 can be changed, the belt body 43 is automatically pressed, and the tension of the belt body 43 is adjusted. The elastic means are not shown in fig. 4.

In practical applications, the elastic device may be a torsion spring, a spring or other components that may power the rotation of the rotating lever 5142. When the elastic device is a torsion spring, the torsion spring is fixed with the housing 5141 and sleeved on the rotary rod 5142, and the torsion arm of the torsion spring is fixedly connected with the rotary rod 5142. When the elastic means is a spring, the spring is installed in the housing 5141 and the inner end thereof is fixedly coupled to the rotating rod 5142.

Referring to fig. 3, in the practical application process, the second connecting member 513 is fixedly mounted to the frame 1 by bolts, and the shape of the second connecting member 513 is not limited, and the second connecting member is adapted to the dental tray set 41 described later, so as to facilitate the mounting.

Referring to fig. 2 and 4, the pulley protector further includes a pinch roller assembly 52 for preventing the belt body 43 from falling off the freewheel 42 of the bicycle. The pinch roller assembly 52 includes a pinch roller body 521, a pinch roller mounting shaft 522 and a fixing member 523, wherein the pinch roller body 521 is rotatably disposed at one end of the pinch roller mounting shaft 522, the other end of the pinch roller mounting shaft 522 is fixedly connected with the fixing member 523, the fixing member 523 is provided with an adjusting hole 5231 at a position opposite to the pinch roller mounting shaft 522, the adjusting hole 5231 is drum-shaped, and the pinch roller mounting shaft 522 is disposed in the adjusting hole 5231 and is connected with the fixing member 523 by a bolt. The anchor 523 is mounted to the frame 1 of the bicycle.

In use, the position of the pinch roller mounting shaft 522 in the adjustment hole 5231 can be adjusted to fine tune the position of the pinch roller body 521 to be closer to the belt body 43 at the engagement with the flywheel 42, preventing the belt body 43 at this position from falling off.

Example 2:

referring to fig. 6, on the basis of embodiment 1, this embodiment 2 provides a bicycle comprising a frame 1, a wheel set 2, a transmission mechanism 4 and the aforementioned protection device.

Referring to fig. 6, the frame 1 includes a front triangle, a rear upper fork 15 and a rear lower fork 16, which are fitted to each other, the front triangle including a head pipe 11, an upper pipe 12, a lower pipe 13 and a riser pipe 14.

Referring to fig. 1 and 6, the transmission mechanism 4 includes a belt body 43, a dental tray set 41, and a flywheel 42. The toothed disc set 41 comprises a toothed disc in meshed transmission with the belt body 43 and two cranks for mounting pedals. The dental tray set 41 is rotatably provided at the lower portion of the front triangle by the spindle. The fluted disc is fixed with the mandrel, one end of the crank is fixed with the end of the mandrel, and the other end of the crank is used for installing a pedal. The second connecting piece 513 of the tension pulley assembly 51 is fixed with the lower part of the front triangle, the tension pulley body 511 is arranged between the dental disc group 41 and the flywheel 42 and is abutted against the outer side surface of the belt body 43, and the tension degree of the belt body 43 is adjusted.

Referring to fig. 2 and 6, the wheel set 2 includes a hub 22, spokes and a rim 21, one end of the spokes is connected to the hub 22, and the other end of the spokes is fixedly mounted to the rim 21. The flywheel 42 is fixedly mounted with the hub 22, the hub 22 is rotatably arranged at two opposite rear ends of the rear upper fork 15 through a wheel shaft, and the belt body 43 drives the flywheel 42 to rotate, so that the hub 22 is driven to rotate by taking the wheel shaft as a rotation shaft. A lifting lug 17 is fixedly arranged between the rear upper fork 15 and the flywheel 42, a fixing piece 523 of the pinch roller assembly 52 is fixedly connected with the lifting lug 17, and the pinch roller body 521 is arranged below the flywheel 42 and is close to the belt body 43 for preventing the belt body 43 from falling off from the flywheel 42.

The bicycle can be a common human-powered bicycle or a bicycle. When the bicycle is a bicycle, a power supply is arranged in the lower pipe 13 of the bicycle frame 1, a driving assembly 3 is arranged at the junction of the lower pipe 13 and the vertical pipe 14, the driving assembly 3 comprises a motor, and the power supply is electrically connected with the motor. The output shaft of the motor is meshed with the mandrel through a gear. The motor is a commercially available motor, and will not be described in detail here. When the power is on, the motor drives the mandrel to rotate, so as to drive the dental tray group 41 and the flywheel 42 to rotate, and further drive the wheel group 2 to rotate.

In the description of the present utility model, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium; may be a communication between two elements or an interaction between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature is "on" or "under" a second feature, which may be in direct contact with the first and second features, or in indirect contact with the first and second features via an intervening medium. Moreover, a first feature "above," "over" and "on" a second feature may be a first feature directly above or obliquely above the second feature, or simply indicate that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is level lower than the second feature.

In the description of the present specification, the terms "one embodiment," "some embodiments," "examples," "particular examples," or "some examples," etc., refer to particular features, structures, materials, or characteristics described in connection with the embodiment or example as being included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While embodiments of the present utility model have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that alterations, modifications, substitutions and variations may be made in the above embodiments by those skilled in the art within the scope of the utility model.

Claims (7)

1. A belt pulley protection device is applicable to a belt pulley driven bicycle and is characterized in that: the pulley protection device comprises a tensioning wheel assembly (51), wherein the tensioning wheel assembly (51) comprises a tensioning wheel body (511), a first connecting piece (512) and a second connecting piece (513);

the tensioning wheel body (511) is rotatably arranged at the rear end of the first connecting piece (512), the first connecting piece (512) and the second connecting piece (513) are rotatably connected together through an elastic adjusting unit (514), the second connecting piece (513) and the frame (1) are fixed together, and the tensioning wheel body (511) is tightly pressed against the belt body (43) to adjust the tightness degree of the belt body (43).

2. A pulley protector as in claim 1, wherein: the elastic adjusting unit (514) comprises a shell (5141), a rotating rod (5142) and an elastic device, wherein the rotating rod (5142) and the elastic device are rotatably installed in the shell (5141), the end part of the elastic device is fixedly connected with the rotating rod (5142), the rotation centers of the end part and the rotating rod are the same, and the first connecting piece (512) and the rotating rod (5142) are fixedly connected together through bolts.

3. A pulley protector as in claim 2, wherein: the elastic device is a torsion spring, the torsion spring is fixed in the shell (5141) and sleeved on the rotating rod (5142), and a torsion arm of the torsion spring is fixedly connected with the rotating rod (5142); or is attached to

The elastic device is a spring, the spring is arranged in the shell (5141), and the inner end of the spring is fixedly connected with the rotating rod (5142).

4. A pulley protector as in claim 1, wherein: the end surfaces of the two ends of the tensioning wheel body (511) are provided with protrusions along the diameter direction of the tensioning wheel body so as to form guide grooves on the wheel surface contacted with the belt body (43).

5. A pulley protector as in claim 1, wherein: the pulley protection device further comprises a pinch roller assembly (52) for preventing the belt body (43) from falling off the flywheel (42) of the bicycle;

the pinch roller assembly (52) comprises a pinch roller body (521), a pinch roller mounting shaft (522) and a fixing piece (523), wherein the pinch roller body (521) is rotatably arranged at one end of the pinch roller mounting shaft (522), the other end of the pinch roller mounting shaft (522) is fixedly connected with the fixing piece (523), the fixing piece (523) is arranged on the frame (1), and the pinch roller body (521) is close to the belt body (43) at the meshing position of the flywheel (42).

6. A pulley protector as in claim 5, wherein: the fixing piece (523) is provided with an adjusting hole (5231) at the position opposite to the pressing wheel mounting shaft (522), the adjusting hole (5231) is drum-shaped, and the pressing wheel mounting shaft (522) is arranged in the adjusting hole (5231) and is connected with the fixing piece (523) through a bolt.

7. A bicycle, characterized in that: the bicycle comprising a frame (1), a wheel set (2), a transmission mechanism (4) and a protection device according to any one of claims 1 to 6;

the frame (1) comprises a front triangle, a rear upper fork (15) and a rear lower fork (16) which are matched with each other, the transmission mechanism (4) comprises a belt body (43), a dental disc group (41) and a flywheel (42), the dental disc group (41) is rotatably arranged at the lower part of the front triangle through a mandrel, the dental disc group (41) and the mandrel are fixed together, a second connecting piece (513) of the tensioning wheel assembly (51) is fixed with the lower part of the front triangle, so that the tensioning wheel body (511) of the tensioning wheel assembly (51) is arranged at a position between the dental disc group (41) and the flywheel (42) and is abutted against the outer side surface of the belt body (43);

the wheel set (2) comprises a wheel hub (22), the flywheel (42) is fixed with the wheel hub (22), the wheel hub (22) is rotatably arranged at the rear end of the rear upper fork (15) through a wheel shaft, a lifting lug (17) is arranged between the rear upper fork (15) and the flywheel (42), and a fixing piece (523) of a pressing wheel assembly (52) of the belt pulley protection device is fixedly connected with the lifting lug (17).