TWI750983B - Pulley and circulating sports equipment with such pulley - Google Patents

Abstract

The invention provides a pulley and a circulating sports equipment with the pulley. The tooth top of each transmission tooth of the belt pulley is inclined from one side of the transmission tooth to the other side, so that the two sides of the tooth top reach the edge of the belt pulley. The central axis has different distances, so that the intersection of the tooth top of the transmission tooth and a tooth surface forms an oblique progressive contact line, and the two ends of the progressive contact line are located at different heights. The sports equipment has a circulating operation mechanism, and the two ends of the transmission shaft are respectively equipped with a said pulley, and the two pulleys are engaged with the two transmission belts, and the two sides of the circulating operation member of the sports equipment are fastened. Connect the two transmission belts. The drive teeth of each pulley contact the belt teeth of each drive belt with the progressive contact line, which can reduce the contact noise between the pulley and the drive belt. In addition, the two transmission belts are subjected to an outward force on the two pulleys, and the circulating operation member is automatically maintained at the center of the sports equipment through the design of the force balance.

Description

Pulleys and circulating sports equipment having such pulleys

The present invention is related to sports equipment and its transmission equipment. Specifically, it refers to a pulley and a circulating sports equipment having the pulley.

The treadmill is a circulatory sports equipment, which has a cyclically rotating running belt for the athlete to run on the running belt to simulate running.

1 and 2 show a pulley 10 and a belt 18 on one side of the treadmill of a conventional treadmill. Two sides of the treadmill belt (not shown) are respectively fixed to two belts 18 on the two sides of the treadmill. The outer peripheral surface of the pulley 10 has a plurality of transmission teeth 12, which are engaged with the teeth 19 on the inner peripheral surface of the belt 18. When a motor (not shown) drives the pulley 10, the pulley 10 drives the belt 18 to rotate cyclically, so that running The running belt (not shown) of the machine rotates cyclically.

Please refer to FIG. 3 and FIG. 4 , the tooth tops 14 of the transmission teeth 12 of the conventional pulley 10 are surfaces of equal height and have the same thickness everywhere, that is, all the tooth tops 14 are located at the same height, and all The thicknesses are the same, therefore, a contact line 16 of the same height is formed on one side edge where the tooth top 14 and the tooth surface 15 meet. As shown in FIG. 2 , when the pulley 10 is engaged with the belt 18 , the transmission teeth 12 of the pulley 10 are in contact with the teeth 19 of the belt 18 by the contact line 16 and transmit the force to the belt 18 .

When the pulley 10 drives the belt 18 to rotate, the transmission teeth 12 of the pulley 10 will engage with the teeth 19 of the belt 18 in sequence and disengage in sequence. During operation, the transmission tooth 12 of the pulley 10 touches the tooth 19 of the belt 18 and makes a slamming noise. Because the contact line 16 of the transmission tooth 12 is a line of equal height, and each part of the contact line 16 is far from the tooth 19 of the belt 18. The distances are the same, so each part of the contact line 16 of the transmission teeth 12 of the pulley 10 is in contact with the teeth 19 of the belt 18 at the same time, resulting in a considerable volume of noise.

Furthermore, in the conventional structure, since the tooth tops 14 of the pulley 10 are of the same height, the belt 18 cannot be positioned effectively, that is, the belt 18 easily slides along the axial direction on the peripheral surface of the pulley 10, so that the running belt Offset occurs, and gradually shifts to the left or right side of the treadmill over time, resulting in incomplete or unsmooth engagement of the pulley and the belt, affecting the transmission efficiency, reducing the service life of the belt and increasing the transmission noise.

The inventors developed the present invention in order to improve the above-mentioned defects of conventional circulating sports equipment (such as treadmills).

The main purpose of the present invention is to provide a pulley and a circulating sports equipment equipped with the pulley, which can reduce the use noise of the circulating sports equipment.

Another object of the present invention is to provide a pulley and a circulating sports equipment equipped with the pulley, which can keep the circulating running components (for example, running belts) of the circulating sports equipment (for example, treadmills) centered, without causing offset.

In order to achieve the purpose disclosed above, a pulley provided by the present invention is provided with a plurality of transmission teeth on its peripheral surface, and each of the transmission teeth has a tooth tip and a first side and a second side located in the axial direction of the pulley; wherein : The tooth top of each of the transmission teeth is inclined from the first side of the transmission tooth to the second side, and has an inclination angle of not more than 10 degrees. The intersection of the tooth top and a tooth surface of each of the transmission teeth forms an inclined The two ends of the progressive contact line of the present invention are located at different heights. Thereby, when the pulley is engaged with a belt, each of the transmission tooth trains gradually contacts the teeth of the belt with the progressive contact line, which can reduce the noise when the pulley is in contact with the belt.

Preferably, the inclination angle of the tip of the transmission tooth is between 2 degrees and 6 degrees.

In a possible implementation, the progressive contact line is located between the first side and the second side of each of the transmission teeth, one end of which is adjacent to or reaches the first side of the transmission tooth, and the other end of which is adjacent to or reaches the transmission tooth. the second side.

In a possible implementation, the distance from the first side of the tooth top of each transmission tooth to the central axis is greater than the distance from the second side to the central axis; the progressive contact line goes from the first side to the first side. The two sides are inclined; the addendum circle formed by the pulley on the first side of the drive teeth is larger than the addendum circle formed by the second side thereof.

In a possible implementation, the height of the first side of the tooth crest is greater than the height of the second side; the thickness of the first side of the tooth crest is smaller than the thickness of the second side; the progressive contact line is three-dimensionally inclined.

In a possible implementation, the tooth space between two adjacent transmission teeth is inclined, and the inclination direction is the same as the inclination direction of each tooth top; the progressive contact line is two-dimensional or three-dimensional inclination.

The present invention provides a circulating sports equipment, which has a circulating operation mechanism and is equipped with the aforementioned pulley, which includes: A drive shaft and a passive shaft are arranged in parallel in front and rear; The two aforementioned pulleys are installed on both ends of the transmission shaft, and the inclination directions of the tooth tops of the transmission teeth of the two pulleys are opposite; Two driven wheels, installed on both ends of the driven shaft; Two transmission belts, the two transmission belts are respectively wound around the pulley and the driven pulley on the same side; each of the pulleys engages each of the transmission belts, and each of the transmission teeth contacts the belt teeth of each of the transmission belts with the progressive contact line; A circulating operation member, the two sides of which are respectively fixed to the two transmission belts; the two pulleys drive the two transmission belts to make the circulating operation member rotate cyclically. Thereby, the meshing noise of the meshed pulley and the drive belt can be reduced.

Preferably, the tooth tops of the drive teeth of each pulley are inclined from the inside to the outside, and the addendum circle formed on the inside of the drive teeth is larger than the addendum circle formed on the outside thereof. Thereby, each belt is subjected to a force from the inside to the outside on each pulley, and the forces on the two transmission belts are reversed and cancel each other out, so that the circulating component can be automatically maintained in the center of the sports equipment without shifting. .

The present invention provides a belt pulley and a circulating sports equipment equipped with the belt pulley. The circulating sports equipment refers to that the sports equipment has a circulating operation mechanism, which enables users to walk, run or climb on the circulating operation mechanism. Actions that simulate sports such as stairs, such as treadmills and stair machines. The treadmill of the treadmill has a cyclically rotating running belt for the athlete to run on the treadmill; The frame of the stair machine rotates cyclically for users to simulate the fitness exercise of climbing stairs. The belt pulley and the belt provided by the present invention can drive the running belt of the treadmill or the pedals of the stair machine to rotate cyclically. The preferred embodiment of this specification is described with a treadmill, but the application of the present invention is not limited to the treadmill, which is explained first.

Please refer to FIG. 5 , which is a partial perspective view of the treadmill 20 (circulating exercise equipment) provided by the first preferred embodiment of the present invention. The body (including the armrest), the display screen and the control unit are not the main objects of the present invention, and are omitted and not shown in the drawings. And the left side of the treadmill 40 in FIG. 5 also removes the cover to show a pulley 50 and a drive belt 60 .

The treadmill 40 is the cyclic operation mechanism of the treadmill 20. A transmission shaft 42 and a driven shaft 44 are respectively arranged at the front and rear ends of the treadmill 40, which are arranged in parallel. Please refer to FIG. 15. Two pulleys 50 are respectively installed in the The two ends of the transmission shaft 42 and the two driven wheels 59 are respectively installed on the two ends of the driven shaft 44 . Two transmission belts (hereinafter referred to as belts) 60 are respectively wound around the pulley 50 and the driven pulley 59 on the same side. A running belt 45 is an endless belt body, which is wound around the transmission shaft 42 and the driven shaft 44 , and the two sides thereof are respectively fixed to the outer peripheral surfaces of the two belts 60 . The running belt 45 is a crawler-type running belt in this embodiment, and has a plurality of slats 46 side by side. Two ends of each slat 46 are respectively fixed to the two belts 60 by connecting elements (not shown). The motor 32 of the driving mechanism 30 drives the drive shaft 42 to rotate by a belt 34 or other similar devices, so that the two pulleys 50 drive the two belts 60 to rotate, and the two belts 60 drive the running belt 45 to the drive shaft 42 and the passive shaft 44 , and the running belt 45 is the circulating running member of the circulating running mechanism. The user can run on the running belt 45 .

Referring to FIG. 6 , the pulley 50 has a central axis C, and its peripheral surface is provided with an adjacent annular groove 51 and an annular tooth area 52 . In this embodiment, the annular groove 51 is located inside the pulley 50 , and The toothed area 52 is located outside the pulley 50, but not limited thereto. The tooth area 52 is provided with a plurality of transmission teeth 53 for engaging with the belt teeth 62 of the belt 60 ; a tooth slot 58 is formed between two adjacent transmission teeth 53 . Please refer to FIG. 7 ( FIG. 7A and FIG. 7B ) to FIG. 9 , the tooth thickness of the transmission teeth 53 of the pulley 50 decreases from the tooth root to the tooth peak. In this preferred embodiment, each transmission tooth 53 is a straight tooth with a slightly trapezoidal cross-section, and can also be other types of teeth. As shown in FIG. 7 ( FIG. 7A and FIG. 7B ), in the present invention, the tooth tops 54 of the transmission teeth 53 are inclined, and form an inclination angle θ with the central axis C, which is not more than 10 degrees, preferably , the inclination angle θ is between 2 degrees and 6 degrees, and 3 degrees is taken as an example in the figure. Each transmission tooth 53 has a first side 531 and a second side 532 in the axial direction of the pulley 50 . The first side 531 corresponds to the inner side of the pulley 50 , and the second side 532 corresponds to the outer side of the pulley 50 . side. The tooth top 54 is inclined from one side of the transmission tooth 53 to the other side, for example, from the first side 531 to the second side 532 or from the second side to the first side. One side 531 is inclined toward the second side 532 , and (based on the central axis C of the pulley 50 ) the height of the transmission teeth 53 on the first side 531 is higher than the height of the second side 532 . In the axial direction of the pulley 50 (ie, the direction between the first side 531 and the second side 532 ), the tooth top 54 can be inclined like a bevel as shown in FIG. 7A , or as shown in FIG. 7B . The top 54 is inclined in an arc shape. In the embodiment of FIGS. 7A and 7B , the tooth grooves 58 of the pulley 50 are horizontal in the axial direction of the pulley and parallel to the central axis C. As shown in FIG. Therefore, as shown in FIG. 7A , the tooth height h1 of each transmission tooth 53 on the first side 531 is greater than the tooth height h2 of the second side 532 , and the tooth heights on both sides of the transmission tooth 53 are not equal.

Referring to FIG. 7A , due to the inclined design of the tooth top 54 , the distance r1 from the first side 531 of the tooth top 54 of the transmission tooth 53 to the central axis C is greater than the distance r2 from the second side 532 to the central axis C. , and as shown in FIGS. 8 and 9 , the thickness t1 of the first side 531 of the tooth top 54 is smaller than the thickness t2 of the second side 532, whereby the distance r1, r2 is not equal, and the thicknesses t1 and t2 of the two sides of the tooth top 54 are not equal. Under this design, an oblique progressive contact line 56 is formed at the intersection of the tooth top 54 and a tooth surface 55 of each transmission tooth 53 , located between the first side and the second side of the transmission teeth, and its two ends are located at different heights, that is, the distances from the two ends of the progressive contact line 56 to the central axis C are different, and the progressive contact of this embodiment is The line 56 is three-dimensionally inclined and varies in height and thickness of the transmission teeth 53 . The progressive contact line 56 formed by the tooth crests 54 of FIG. 7A is a straight line, and the progressive contact line 56 formed by the tooth crest 54 of FIG. 7B is an arc-shaped line. The imaginary line in FIG. 8 shows the outline of the transmission teeth 12 of the conventional pulley 10 in FIG. 1 , and the solid line shows the outline of the transmission tooth 53 of the present embodiment for contrast.

The two ends of the progressive contact line 56 are located at different heights, and as shown in the top view of FIG. 9 , the progressive contact line 56 of this embodiment is an involute line, so that the thickness of the tooth crest 54 varies.

The two ends of the progressive contact line 56 are located between the first side 531 and the second side 532 of the transmission tooth 53 . It should be noted that the tooth top 54 goes from the higher side (the first side) of the transmission tooth 53 to the upper side (the first side). The main purpose of the inclination of the lower side (second side) is to form the inclined progressive contact line 56, and it does not limit whether the length of the progressive contact line 56 is set to the full width of the transmission teeth 53, all the tooth tops 54 . To be more specific, in the first embodiment of FIGS. 7 to 9 , the two ends of the progressive contact line 56 reach the two sides 531 and 532 of the transmission teeth 53 respectively. However, other implementation forms are possible, as shown in the figure 10 and FIG. 11 , the tooth top 54 is only inclined to the second side 532 at the position G adjacent to the first side 531, between the position G and the first side 531, for example, a quarter or five of the tooth width. 1/1, the tooth top 54 remains horizontal (parallel to the central axis C), and is only inclined between the position G and the second side 532, and the progressive contact line 56 is only formed in the range of the inclination, such as the tooth width three-quarters or four-fifths of the range. Therefore, in this embodiment, the first end of the progressive contact line 56 is adjacent to but not reaching the first side 531 of the drive teeth, and the second end thereof reaches the second side 532 of the drive teeth. The phantom line in FIG. 11 shows the outline of the transmission tooth 12 of the conventional pulley 10 in FIG. 1 , and the solid line shows the outline of the transmission tooth 53 in this embodiment. It is understood that the second end of the progressive contact line 56 can also be made adjacent to but not reaching the second side 532 .

Furthermore, since the distances r1 and r2 from the two sides 531 and 532 of the tooth top 54 of the transmission teeth 53 to the central axis C are not equal, as shown in FIG. 6 and FIG. 12 , the transmission teeth 53 of the pulley 50 The diameter D1 of the first side is larger than the diameter D2 of the second side, so that the addendum circle R1 of the first side of the pulley 50 is larger than the addendum circle R2 of the second side.

Please refer to FIG. 6 , each belt 60 is an annular belt body, a protruding strip 61 and a plurality of belt teeth 62 are disposed on the inner peripheral surface of the belt 60 along the circumference of the belt 60 , and the protruding strip 61 is located on one side of the belt 60 ( For example, the inner side), and the belt teeth 62 are located on the other side (eg, the outer side) of the belt 60 to correspond to the annular groove 51 and the transmission teeth 53 of the pulley 50 respectively. Each belt tooth 62 is a straight tooth with a slightly trapezoidal cross section, and its tooth thickness decreases from the tooth root to the tooth peak. Similarly, the belt teeth 62 can also be other types of teeth to match with the transmission teeth 53 .

Please refer to FIGS. 5 , 12 and 13 , each belt 60 is wound between the pulley 50 and the driven pulley 59 on the same side, the transmission teeth 53 of the pulley 50 are engaged with the belt teeth 62 of the belt 60 , and the belt 60 The protruding strip 61 is sleeved on the annular groove 51 of the pulley 50 . The two pulleys 50 of the treadmill 20 can drive the two belts 60 through the engagement between the transmission teeth 53 and the belt teeth 62, and the friction between the protruding strips 61 and the annular groove 51, so as to make the running belt 45 rotate cyclically, and the pulleys 50 and belt 60 rotate in the same direction. In this embodiment, the transmission force provided by the protruding strip 61 and the ring groove 51 is greater than the transmission force between the transmission teeth 53 and the belt teeth 62 , therefore, the two pulleys 50 and the two transmission belts 60 have a transmission function in addition to the transmission function. In addition, it also functions as a timing gear and a timing belt, so that the two belts 60 keep rotating synchronously without time difference, so that the running speed of the two sides of the running belt 45 remains the same and maintains a smooth operation.

As shown in FIGS. 8 , 13 and 14 , when the transmission teeth 53 of the pulley 50 are engaged with the belt teeth 62 of the belt 60 , since the tooth top 54 of the transmission teeth 53 has the design of the progressive contact line 56 , the progressive The contact lines 56 are not of equal height, and the distances from the belt teeth 62 are different. Therefore, when the transmission teeth 53 touch and drive the belt teeth 62, the progressive contact line 56 gradually contacts the belt teeth 62. That is, the transmission teeth 53 gradually touch the belt teeth 62 from one side to the other side, and not the entire tooth surface 55 contacts the belt teeth 62 at the same time. When the teeth are separated from the belt teeth), the bumping noise can be effectively reduced. According to the inventor's test, the noise can be reduced by at least 30%.

FIG. 15 shows that the drive shaft 42 of the treadmill engages with two pulleys 50 and drives two belts 60 . The inclination directions of the tooth crests 54 of the transmission teeth 53 of the two belt pulleys 50 are opposite, from the inner side of the tooth crest 54 to the outer side. As shown in FIG. 6 and FIG. 12 , since the addendum 54 of the transmission tooth 53 is inclined from the first side 531 (inside) to the second side 532 (outside), the addendum circle R1 of the first side (inside) is larger than the second side 532 (outside). Therefore, in terms of the annular tooth region 52 of the pulley 50, the outer diameter D2 of the transmission teeth 53 of the pulley 50 is smaller, and the inner diameter D1 is larger, so as shown in the figure As shown in 15, when the two pulleys 50 drive the two transmission belts 60, each transmission belt 60 bears the force F from the inside to the outside on the pulley 50, due to the action of the transmission belts 60 on both sides of the running belt 45. The forces F are opposite to each other and just cancel each other out and balance. As a result, a mechanism for maintaining the center of the running belt is formed, so that the running belt 45 remains in the center of the treadmill 40 and does not shift to the right or left. The centering function of the running belt 45 also makes the pulley 50 and the transmission belt 60 maintain a good and smooth meshing and transmission, maintain a good transmission efficiency, prolong the service life of the running belt, the pulley and the transmission belt and reduce the transmission noise.

16 to 18 are the third preferred embodiment of the present invention, the drawings only show the partial structure of the pulley 50, but not the belt, and the same components use the same symbols.

The tooth tops 54 of the transmission teeth 53 in this embodiment are also designed to be inclined, so that the distances r1 and r2 from the first side 531 and the second side 532 of the tooth tops 54 of the transmission teeth 53 to the central axis C are not equal, and the Addendum circles R1, R2 of different sizes inside and outside. The tooth tops 54 may be inclined to be arranged with all the tooth tops 54 shown in FIG. 7A and FIG. 7B , and may also be inclined to be arranged by some of the tooth tops 54 shown in FIG. 10 . In addition, the tooth slot 58 in this embodiment is also inclined, and its inclination direction is the same as the inclination direction of the tooth top 54 , and its inclination angle is preferably the same as the inclination angle θ of the tooth top 54 . Thereby, the tooth height h and the tooth thickness t of the two sides 531 and 532 of each transmission tooth 53 are the same, and an oblique progressive contact line 56 is also formed at the intersection of the tooth top 54 of the transmission tooth 53 and a tooth surface 55 . , the contact noise between the transmission teeth 53 and the belt teeth 62 can be reduced. In addition, the running belt of the treadmill using the pulley 50 of this embodiment also has the effect of maintaining the center. When the inclination angle of the tooth slot 58 is the same as the inclination angle of the tooth top 54, the transmission teeth 53 can have a single thickness, and a two-dimensional inclined progressive contact line 56 can be formed; when the inclination angle of the tooth slot 58 is the same as the inclination angle of the tooth When the inclination angles of the top 54 are different, the transmission teeth 53 can have unequal tooth thicknesses, and a three-dimensional inclined progressive contact line 56 can be formed.

The belt pulley of the present invention can be applied to the circulating running mechanism of other forms of sports equipment, so that other forms of circulating sports equipment (such as stair machines) can also be retracted to reduce noise and maintain the centering of circulating running components (such as the treads of stair machines) without The effect of left and right offset. Specifically, the circulating operation mechanism of the stair machine has: a drive shaft and a passive shaft, which are arranged in parallel in the front and rear; two pulleys are installed at both ends of the transmission shaft; two passive pulleys are installed on the passive shaft Two ends; two transmission belts, which are respectively wound around the pulley and driven pulley on the same side; a circulating running member (most pedals of the stair machine), the two sides of which are respectively fixed to the two transmission belts. The two pulleys drive the two belts, so that the circulating operation member rotates cyclically, and the user moves on the circulating operation member. The invention can reduce the contact noise of the pulley and the transmission belt, and can maintain the centering of the circulating running member.

The above-mentioned embodiments are only intended to illustrate the features of the present invention and not to limit them, and all equivalent modifications of the present invention should be regarded as the protection scope of the present invention.

20: Treadmill 30: Drive mechanism 32: Motor 34: Belt 40: Treadmill 42: Drive shaft 44: Passive axis 45: Running Belt 46: Batten 50: pulley 51: Ring groove 52: Ring tooth area 53: Transmission teeth 531: First side 532: Second side 54: Addendum 55: tooth surface 56: Progressive Contact Line 58: Cogging 59: Passive Wheel 60: Transmission belt 61: Rib 62: Belt teeth θ: tilt angle h, h1, h2: height t, t1, t2: thickness C: Center axis r1, r2: distance D1, D2: diameter F: force G: Location R1, R2: Addendum circle

The purpose of the present invention, the characteristic and the effect achieved can be understood from the descriptions and drawings of the following preferred embodiments, wherein: FIG. 1 is a perspective view of a pulley and a belt of a conventional treadmill. FIG. 2 is a side view of the pulley and belt of FIG. 1 in an engaged state. FIG. 3 is a cross-sectional view taken along line 3-3 of FIG. 1 . Figure 4 shows the configuration of a drive tooth of a conventional pulley. 5 is a partial perspective view of the treadmill according to the first preferred embodiment of the present invention. 6 is a perspective view of the pulley and the belt according to the first preferred embodiment of the present invention. FIG. 7A is a cross-sectional view taken along line 7-7 of FIG. 6 . Fig. 7B is the same as Fig. 7A, showing another embodiment of the teeth of the pulley. Figure 8 shows a schematic diagram of the profile of the configuration of one of the drive teeth of the pulley. FIG. 9 is a top view of FIG. 8 . FIG. 10 is the same as FIG. 7A , showing a cross-sectional view of the pulley according to the second preferred embodiment of the present invention, and showing that the tooth tops of the transmission teeth are arranged obliquely. FIG. 11 is a schematic diagram showing the profile of a drive tooth of the pulley of FIG. 10 . Fig. 12 is a cross-sectional view taken along line 12-12 of Fig. 5, showing a pulley and a belt. Figure 13 shows a side view of the pulley of Figure 6 engaged with the belt. FIG. 14 is a partial enlarged view of FIG. 13 . Figure 15 is a cross-sectional view taken along line 15-15 of Figure 5, and shows the running belt centered between the two pulleys. Fig. 16 is the same as Fig. 7A, showing a cross-sectional view of the pulley according to the third preferred embodiment of the present invention. FIG. 17 is a schematic diagram showing the configuration profile of one tooth of the pulley according to the third preferred embodiment of the present invention. FIG. 18 is a top view of FIG. 17 .

42: Drive shaft

45: Running Belt

46: Batten

50: pulley

53: Transmission teeth

54: Addendum

60: Transmission belt

F: force

Claims (10)

A pulley having a central shaft and comprising: A plurality of transmission teeth are arranged on the peripheral surface of the pulley, each of the transmission teeth has a tooth tip, and each of the transmission teeth has a first side and a second side in the axial direction of the pulley; wherein: The tooth top of each of the transmission teeth is inclined from the first side of the transmission tooth to the second side, with an inclination angle of not more than 10 degrees, and the distances from the two sides of each tooth top to the central axis of the pulley are not equal, An oblique progressive contact line is formed at the intersection of the tooth top and a tooth surface of each of the transmission teeth, and two ends of the progressive contact line are located at different heights. The pulley as claimed in claim 1, wherein: the tooth top is inclined like a bevel; and the progressive contact line is a straight line. The pulley according to claim 1, wherein: the tooth top is inclined in an arc shape; the progressive contact line is an arc line. The pulley of claim 1, wherein: the inclination angle is between 2 degrees and 6 degrees. The pulley of claim 1, wherein: the progressive contact line is located between the first side and the second side of each of the transmission teeth, one end of which is adjacent to or reaches the first side of the transmission tooth, and the other end is adjacent to the first side of the transmission tooth. or to the second side of that drive tooth. The pulley as claimed in claim 1, wherein: the distance from the first side of the tooth tip to the central axis is greater than the distance from the second side to the central axis; the progressive contact line goes from the first side to the first side The two sides are inclined; the addendum circle formed by the pulley on the first side of the drive teeth is larger than the addendum circle formed by the second side thereof. The pulley of claim 6, wherein: the height of the first side of the tooth top is greater than the height of the second side; the thickness of the first side of the tooth top is smaller than the thickness of the second side. The pulley as claimed in claim 6, wherein: there is a tooth slot between two adjacent transmission teeth, each of the tooth slot is inclined, and the inclination direction is the same as the inclination direction of each of the tooth tops. A circulating sports equipment has a circulating running mechanism, comprising: A drive shaft and a passive shaft are arranged in parallel in front and rear; Two pulleys according to any one of claims 1 to 8 are installed on both ends of the transmission shaft, and the inclination directions of the tooth tops of the transmission teeth of the two pulleys are opposite; Two driven wheels, installed on both ends of the driven shaft; Two transmission belts with a plurality of belt teeth on their inner peripheral surfaces; the two transmission belts are respectively wound around the pulley and the driven pulley on the same side; each of the pulleys engages with each of the transmission belts, and each of the transmission teeth is in contact with the progressive contact line each of the belt teeth; A circulating operation member, the two sides of which are respectively fixed to the two transmission belts; the two pulleys drive the two transmission belts to make the circulating operation member rotate cyclically. The circulating sports equipment as claimed in claim 9, wherein: the tooth tops of the drive teeth of each pulley are inclined from the inside to the outside, and the addendum circle formed on the inside of the drive teeth is larger than the addendum circle formed on the outside thereof.

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