Belt system tensioning device

Abstract

The utility model relates to the technical field of bicycle belt systems, and discloses a belt system tensioning device which comprises a folding bicycle frame front part, a folding center shaft is arranged on the rear side of the folding bicycle frame front part, a folding bicycle frame rear half part is arranged on the rear side of the folding center shaft, and the folding bicycle frame rear half part is arranged on the rear side of the folding center shaft. A front fluted disc is arranged on the right side of the front portion of the folding bicycle frame, a tooth claw is fixedly installed on the right side of the front fluted disc, a fixed disc nail set is fixedly installed on the right side of the tooth claw, and a belt is arranged on the outer side of the front fluted disc. According to the belt system tensioning device, the multiple first clamping grooves are additionally formed in the tensioning base mechanism, the positions of the first clamping grooves with different angles can be selected for assembly and adjustment, and therefore the tension requirement under all actual use conditions is met; when the bicycle is folded, the belt can be tightened after the center distance between the front fluted disc and the rear fluted disc is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of bicycle belt systems, and particularly to a belt system tensioning device. Background Technique

[0002] A bicycle, also known as a pedal bike or a cycle, is usually a small two-wheeled land vehicle. After a person gets on the bike, it uses the feet to step on the pedals as power, and drives the tires to roll through a chain or a belt. It is a green and environment-friendly means of transportation. Traditional bicycles usually have relatively large sizes and require more space for storage and transportation, which is inconvenient to carry. A folding bicycle is a type of bicycle with a unique design. It is innovated on the basis of traditional bicycles to meet people's needs for portability and flexibility. Tensioning devices are often used in belt drive systems or chain drive systems. Usually, when the center distance of the belt or chain cannot be adjusted, a tensioning wheel can be used to tension the belt or chain, playing a role in adjusting the tension of the belt or chain. The tensioning wheel device can also change the wrapping angle of the belt pulley or gear, thereby preventing the problem of belt or chain skipping teeth.

[0003] In existing tensioning devices, the belt pulley usually drives by friction. During installation, the belt must be tensioned to an appropriate tension range value. However, after working for a period of time, the belt will be stretched and become loose, and it is easy to slip. In this case, it must be re-tensioned. When the center distance between the two driving wheels cannot be adjusted, a tensioning wheel device must be used to adjust its tension to ensure that the belt does not slip or skip teeth in a normal driving environment. The tensioning wheel usually uses a spring or hydraulic pressure, etc. to generate a force to tighten the belt, so that the belt or chain can automatically press on the working belt pulley or chain with an appropriate pressure according to its different tightness degrees. And the tension of the tensioning wheel cannot be too small. If it is too small, the friction between the belt and the working wheel will become smaller, and ultimately the belt will slip. Similarly, the tension of the tensioning wheel cannot be too large. Excessive tension will increase the load on the belt, cause the belt to be easily worn, and ultimately damage the bearing of the working wheel, and finally shorten the service life of the entire drive system. Therefore, a belt system tensioning device needs to be proposed. Content of the Utility Model

[0004] The purpose of the utility model is to provide a belt system tensioning device to solve the problems put forward in the above background technique.

[0005] To achieve the above object, the present utility model provides the following technical solutions: A belt system tensioning device, including the front part of the folding bicycle frame, a folding center shaft is arranged at the rear side of the front part of the folding bicycle frame, the rear part of the folding bicycle frame is arranged at the rear side of the folding center shaft, a front sprocket is arranged at the right side of the front part of the folding bicycle frame, a tooth claw is fixedly installed at the right side of the front sprocket, a fixed disc nail group is fixedly installed at the right side of the tooth claw, a belt is arranged at the outside of the front sprocket, a frame rear hook claw is fixedly installed at the rear side of the rear part of the folding bicycle frame, a rear sprocket is arranged at the left side of the frame rear hook claw, a tensioning base mechanism is arranged at the right side of the frame rear hook claw, a tensioning support mechanism is arranged at the right side of the tensioning base mechanism, a torsion spring and a sleeve one are arranged at the inner side of the tensioning support mechanism, a tensioning wheel mechanism one is arranged at the left side of the tensioning base mechanism, a tensioning wheel mechanism two is arranged at the left side of the tensioning support mechanism, a deep groove ball bearing one and a shaft retaining ring one are arranged at the inner side of the tensioning wheel mechanism two, a deep groove ball bearing two and a shaft retaining ring two are arranged at the inner side of the tensioning wheel mechanism one, a tensioning shaft one is fixedly installed at the left side of the tensioning support mechanism, a sleeve two is arranged at the outside of the tensioning shaft one, a tensioning shaft two is fixedly installed at the right side of the tensioning base mechanism, and a sleeve three is arranged at the outside of the tensioning shaft two;

[0006] The tensioning base mechanism includes a tensioning base body, a fixing hole, a fixing groove, a clamping seat and a clamping groove one. The tensioning base body is located at the right side of the frame rear hook claw. A fixing hole is opened at the right side of the tensioning base body, a fixing groove is opened at the inner side of the fixing hole, a clamping seat is opened at the right side of the tensioning base body, and a clamping groove one is opened at the outside of the clamping seat.

[0007] Preferably, the tensioning support mechanism includes a tensioning support body, a shaft hole one, a clamping groove two and a shaft hole two. The tensioning support body is located at the right side of the tensioning base mechanism. A shaft hole one is opened at the left side of the tensioning support body, a clamping groove two is opened at the left side of the tensioning support body, and a shaft hole two is opened at the left side of the tensioning support body.

[0008] Preferably, the tensioning wheel mechanism one includes a tensioning wheel mechanism one body, a bearing hole and a clamping groove three. The tensioning wheel mechanism one body is located at the left side of the tensioning base mechanism. A bearing hole is opened at the inner side of the tensioning wheel mechanism one body, and a clamping groove three is opened at the inner side of the tensioning wheel mechanism one body.

[0009] Preferably, a plurality of fixing grooves are opened at the inner side of the fixing hole, and a plurality of clamping grooves one are opened around the outside of the clamping seat.

[0010] Preferably, a tensioning shaft one is fixedly installed at the inner side of the shaft hole two through a locking screw, and the clamping groove two is adapted to the torsion spring.

[0011] Preferably, the bearing hole is adapted to the deep groove ball bearing II, and the clamping groove III is adapted to the shaft retaining ring II.

[0012] Preferably, the tensioning wheel mechanism I and the tensioning wheel mechanism II have the same structure, and the size of the tensioning wheel mechanism I is larger than that of the tensioning wheel mechanism II.

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0014] 1. For this belt system tensioning device, through the setting of multiple clamping grooves I added in the tensioning base mechanism, it is possible to select the positions of the clamping grooves I at different angles for assembly and adjustment, so as to meet the tension requirements under various actual usage conditions. Through the setting of the double tensioning wheels of the tensioning wheel mechanism I and the tensioning wheel mechanism II, when the bicycle is folded, the center distance between the front sprocket and the rear sprocket is reduced, and the belt can be tightened. Moreover, the tensioning wheel mechanism I is placed outside the loose side of the belt and close to the smaller rear sprocket. Such a design not only meets the problem of belt tension, but also meets the usage function of tightening the belt during the folding process of the bicycle.

[0015] 2. For this belt system tensioning device, through the opening of multiple fixing slot positions at the central positions in the fixing holes of the tensioning base mechanism, it can meet the use of different rear sprockets, effectively reducing the variety of parts, greatly reducing the cost control, and the later after-sales replacement is also simple and easy to operate. It also avoids the need to equip different tensioning base mechanisms for different specifications of rear sprockets. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of the overall structure of the present utility model;

[0017] Figure 2 is a schematic diagram of the folded state structure of the present utility model;

[0018] Figure 3 is a schematic diagram of the installation structure of the tensioning base mechanism and the tensioning bracket mechanism of the present utility model;

[0019] Figure 4 is a schematic diagram of the disassembled structure of the tensioning base mechanism and the tensioning bracket mechanism of the present utility model;

[0020] Figure 5 is a three-dimensional structure schematic diagram of the tensioning base mechanism of the present utility model;

[0021] Figure 6 is a right view structure schematic diagram of the tensioning base mechanism of the present utility model;

[0022] Figure 7 is a three-dimensional structure schematic diagram of the tensioning bracket mechanism of the present utility model;

[0023] Figure 8This is a three-dimensional structural schematic diagram of the tensioning wheel mechanism of the present utility model;

[0024] Figure 9 This is an installation structural schematic diagram of the tensioning base mechanism and the tensioning wheel mechanism of the present utility model;

[0025] Figure 10 This is an installation structural schematic diagram of the rear sprocket, the tensioning base mechanism and the tensioning bracket mechanism of the present utility model.

[0026] Wherein: 1. Front part of the folding bicycle frame; 2. Rear part of the folding bicycle frame; 3. Front sprocket; 4. Tooth claw; 5. Fixed disk nail group; 6. Belt; 7. Rear hook claw of the frame; 8. Rear sprocket; 9. Tensioning base mechanism; 901. Tensioning base body; 902. Fixed hole; 903. Fixed groove; 904. Card seat; 905. First card slot; 10. Tensioning bracket mechanism; 1001. Tensioning bracket body; 1002. First shaft hole; 1003. Second card slot; 1004. Second shaft hole; 11. Torsion spring; 12. First shaft sleeve; 13. First tensioning wheel mechanism; 1301. First tensioning wheel mechanism body; 1302. Bearing hole; 1303. Third card slot; 14. Second tensioning wheel mechanism; 15. First deep groove ball bearing; 16. First shaft retaining ring; 17. Second deep groove ball bearing; 18. Second shaft retaining ring; 19. First tensioning shaft; 20. Second shaft sleeve; 21. Second tensioning shaft; 22. Third shaft sleeve; 23. Folding center shaft. Specific embodiments

[0027] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0028] Please refer to Figures 1-10, the present utility model provides a technical solution: a belt system tensioning device, including the front part 1 of the folding bicycle frame. There is a folding center shaft 23 arranged at the rear side of the front part 1 of the folding bicycle frame. There is a rear part 2 of the folding bicycle frame arranged at the rear side of the folding center shaft 23. There is a front sprocket 3 arranged on the right side of the front part 1 of the folding bicycle frame. A tooth claw 4 is fixedly installed on the right side of the front sprocket 3. A fixed disk nail group 5 is fixedly installed on the right side of the tooth claw 4. A belt 6 is arranged outside the front sprocket 3. A frame rear hook claw 7 is fixedly installed at the rear side of the rear part 2 of the folding bicycle frame. A rear sprocket 8 is arranged on the left side of the frame rear hook claw 7. A tensioning base mechanism 9 is arranged on the right side of the frame rear hook claw 7. A tensioning support mechanism 10 is arranged on the right side of the tensioning base mechanism 9. A torsion spring 11 and a sleeve one 12 are arranged inside the tensioning support mechanism 10. A tensioning wheel mechanism one 13 is arranged on the left side of the tensioning base mechanism 9. A tensioning wheel mechanism two 14 is arranged on the left side of the tensioning support mechanism 10. A deep groove ball bearing one 15 and a shaft retaining ring one 16 are arranged inside the tensioning wheel mechanism two 14. A deep groove ball bearing two 17 and a shaft retaining ring two 18 are arranged inside the tensioning wheel mechanism one 13. A tensioning shaft one 19 is fixedly installed on the left side of the tensioning support mechanism 10. A sleeve two 20 is arranged outside the tensioning shaft one 19. A tensioning shaft two 21 is fixedly installed on the right side of the tensioning base mechanism 9. A sleeve three 22 is arranged outside the tensioning shaft two 21. The tensioning base mechanism 9 includes a tensioning base body 901, a fixing hole 902, a fixing groove 903, a clamping seat 904 and a first clamping groove 905. The tensioning base body 901 is located on the right side of the frame rear hook claw 7. A fixing hole 902 is opened on the right side of the tensioning base body 901. A fixing groove 903 is opened inside the fixing hole 902. A clamping seat 904 is opened on the right side of the tensioning base body 901. A first clamping groove 905 is opened outside the clamping seat 904. Through the arrangement of multiple first clamping grooves 905 added in the tensioning base mechanism 9, it is possible to select the positions of the first clamping grooves 905 at different angles for assembly adjustment, so as to meet the tension requirements under various actual use conditions. By opening a plurality of fixing groove holes 903 at the central positions inside the fixing hole 902 in the tensioning base mechanism 9, it is possible to meet the use of different rear sprockets 8, effectively reducing the variety and complexity of parts, greatly reducing the cost control, and the later after-sales replacement is also simple and easy to operate, and it also avoids the need to equip different tensioning base mechanisms 9 for different specifications of rear sprockets 8;

[0029] Please refer to Figures 2-10, in this embodiment, the tensioning bracket mechanism 10 includes a tensioning bracket body 1001, a first shaft hole 1002, a second clamping groove 1003 and a second shaft hole 1004. The tensioning bracket body 1001 is located on the right side of the tensioning base mechanism 9. A first shaft hole 1002 is provided on the left side of the tensioning bracket body 1001. A second clamping groove 1003 is provided on the left side of the tensioning bracket body 1001. A second shaft hole 1004 is provided on the left side of the tensioning bracket body 1001. The first tensioning wheel mechanism 13 includes a first tensioning wheel mechanism body 1301, a bearing hole 1302 and a third clamping groove 1303. The first tensioning wheel mechanism body 1301 is located on the left side of the tensioning base mechanism 9. A bearing hole 1302 is provided on the inner side of the first tensioning wheel mechanism body 1301. A third clamping groove 1303 is provided on the inner side of the first tensioning wheel mechanism body 1301. A plurality of fixing grooves 903 are provided on the inner side of the fixing hole 902. A plurality of first clamping grooves 905 are provided around the outer side of the clamping seat 904. A first tensioning shaft 19 is fixedly installed in the second shaft hole 1004 through a locking screw. The second clamping groove 1003 is adapted to the torsion spring 11. The bearing hole 1302 is adapted to the deep groove ball bearing II 17. The third clamping groove 1303 is adapted to the shaft retaining ring II 18. The first tensioning wheel mechanism 13 and the second tensioning wheel mechanism 14 have the same structure. The size of the first tensioning wheel mechanism 13 is larger than that of the second tensioning wheel mechanism 14. Through the setting of the double tensioning wheels of the first tensioning wheel mechanism 13 and the second tensioning wheel mechanism 14, when the bicycle is folded, the center distance between the front sprocket 3 and the rear sprocket 8 is reduced, and the belt 6 can be tightened. Moreover, the first tensioning wheel mechanism 13 is placed on the outer side of the loose side of the belt 6 close to the smaller rear sprocket 8. Such a design not only meets the problem of the tensioning force of the belt 6, but also meets the use function of tightening the belt during the folding process of the bicycle.

[0030] Working principle: First, insert the tensioning shaft 19 into the corresponding shaft hole 1004 of the tensioning bracket mechanism 10, and then lock it to the tensioning bracket mechanism 10 with a locking screw. After that, install the deep groove ball bearing 15 into the same bearing hole 1302 of the tensioning wheel mechanism 14 as that of the tensioning wheel mechanism 13. Then, insert the shaft retaining ring 16 into the same clamping groove 1303 of the tensioning wheel mechanism 14 as that of the tensioning wheel mechanism 13 to assemble a small tensioning wheel assembly. Next, sleeve the sleeve 20 onto the tensioning shaft 19, then sleeve the small tensioning wheel assembly onto the tensioning shaft 19, and then sleeve the flat washer onto the locking screw. Finally, lock it to the tensioning shaft 19. Then, press-fit the deep groove ball bearing 17 into the bearing hole 1302 of the tensioning wheel mechanism 13, and insert the shaft retaining ring 18 into the clamping groove 1303 of the tensioning wheel mechanism 13 to assemble a large tensioning wheel assembly. After that, pass the tensioning shaft 21 through the fixing hole 902 of the tensioning base mechanism 9, then sleeve the sleeve 22, and then sleeve the large tensioning wheel assembly onto the tensioning shaft 21. Then, sleeve the flat washer onto the locking screw. Finally, lock it to the tensioning shaft 21. Then, hook the left and right ends of the torsion spring 11 into the clamping groove 905 of the tensioning base mechanism 9 and the clamping groove 1003 of the tensioning bracket mechanism 10 respectively. Then, put the sleeve 12 into the shaft hole 1002 of the tensioning bracket mechanism 10, and finally lock it with a locking screw to assemble the tensioning device. After that, install the corresponding tooth claws 4 at the center position of the front part 1 of the folding bicycle frame, and then install the front chainring 3 with several groups of fixing disc nails 5 one by one. Then, install the rear chainring 8 on the wheel hub of the rear part 2 of the folding bicycle frame. Finally, install the belt 6 on the front chainring 3 and the rear chainring 8 to complete the assembly of the belt system. Then, assemble the tensioning device to the center corresponding to the rear hook claw 7 of the rear part 2 of the folding bicycle frame, and lock it with a locking nut. Note that the outer diameter of the tensioning wheel mechanism 13 of the large tensioning wheel assembly needs to press against the belt 6. Finally, rotate the tensioning bracket mechanism 10 around the shaft hole 1002 in the counterclockwise direction, install the tensioning wheel mechanism 14 into the belt 6, and make the outer diameter of the tensioning wheel mechanism 14 press against the belt 6. In this way, the entire belt drive tensioning device is assembled. When the folding bicycle needs to be folded for storage, the rear part 2 of the folding bicycle frame folds around the folding center shaft 23, and the tensioning base mechanism 9 and the tensioning bracket mechanism 10 will rotate counterclockwise and clockwise respectively under the action of the torsion spring 11 to tighten the excess belt 6.

[0031] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A belt system tensioning device, comprising the front part (1) of the folding bike frame, characterized in that: At the rear side of the front part (1) of the folding bike frame, there is a folding central axis (23). At the rear side of the folding central axis (23), there is the rear half part (2) of the folding bike frame. On the right side of the front part (1) of the folding bike frame, there is a front sprocket (3). On the right side of the front sprocket (3), there is a pawl (4) fixedly installed. On the right side of the pawl (4), there is a fixed disk nail group (5) fixedly installed. Outside the front sprocket (3), there is a belt (6). At the rear side of the rear half part (2) of the folding bike frame, there is a frame rear hook claw (7) fixedly installed. On the left side of the frame rear hook claw (7), there is a rear sprocket (8). On the right side of the frame rear hook claw (7), there is a tensioning base mechanism (9). On the right side of the tensioning base mechanism (9), there is a tensioning bracket mechanism (10). Inside the tensioning bracket mechanism (10), there are a torsion spring (11) and a sleeve one (12). On the left side of the tensioning base mechanism (9), there is a tensioning wheel mechanism one (13). On the left side of the tensioning bracket mechanism (10), there is a tensioning wheel mechanism two (14). Inside the tensioning wheel mechanism two (14), there are a deep groove ball bearing one (15) and a shaft retaining ring one (16). Inside the tensioning wheel mechanism one (13), there are a deep groove ball bearing two (17) and a shaft retaining ring two (18). On the left side of the tensioning bracket mechanism (10), there is a tensioning shaft one (19) fixedly installed. Outside the tensioning shaft one (19), there is a sleeve two (20). On the right side of the tensioning base mechanism (9), there is a tensioning shaft two (21) fixedly installed. Outside the tensioning shaft two (21), there is a sleeve three (22). The tensioning base mechanism (9) includes a tensioning base body (901), a fixing hole (902), a fixing groove (903), a clamping seat (904), and a first clamping groove (905). The tensioning base body (901) is located on the right side of the frame rear hook claw (7). On the right side of the tensioning base body (901), there is a fixing hole (902) opened. Inside the fixing hole (902), there is a fixing groove (903) opened. On the right side of the tensioning base body (901), there is a clamping seat (904) opened. Outside the clamping seat (904), there is a first clamping groove (905) opened.

2. The belt system tensioning device according to claim 1, characterized in that: The tensioning bracket mechanism (10) includes a tensioning bracket body (1001), a first shaft hole (1002), a second clamping groove (1003), and a second shaft hole (1004). The tensioning bracket body (1001) is located on the right side of the tensioning base mechanism (9). On the left side of the tensioning bracket body (1001), there is a first shaft hole (1002) opened. On the left side of the tensioning bracket body (1001), there is a second clamping groove (1003) opened. On the left side of the tensioning bracket body (1001), there is a second shaft hole (1004) opened.

3. The belt system tensioning device according to claim 1, characterized in that: The tensioning wheel mechanism 1 (13) includes a tensioning wheel mechanism 1 body (1301), a bearing hole (1302), and a third clamping groove (1303). The tensioning wheel mechanism 1 body (1301) is located on the left side of the tensioning base mechanism (9). A bearing hole (1302) is provided inside the tensioning wheel mechanism 1 body (1301), and a third clamping groove (1303) is provided inside the tensioning wheel mechanism 1 body (1301).

4. A belt system tensioning device according to claim 1, characterized in that: A plurality of fixing grooves (903) are provided inside the fixing holes (902), and a plurality of first clamping grooves (905) are provided around the outside of the clamping seat (904).

5. The belt system tensioning device according to claim 2, characterized in that: A tensioning shaft 1 (19) is fixedly installed inside the shaft hole 2 (1004) through a locking screw, and the second clamping groove (1003) is adapted to the torsion spring (11).

6. The belt system tensioning device according to claim 3, wherein: The bearing hole (1302) is adapted to the deep groove ball bearing 2 (17), and the third clamping groove (1303) is adapted to the shaft retaining ring 2 (18).

7. The belt system tensioning device according to claim 1, characterized in that: The tensioning wheel mechanism 1 (13) has the same structure as the tensioning wheel mechanism 2 (14), and the size of the tensioning wheel mechanism 1 (13) is larger than that of the tensioning wheel mechanism 2 (14).

Images