Belt pulley structure with replaceable output rotation direction

Abstract

The utility model discloses a belt pulley structure with a replaceable output rotation direction, which comprises a base, a central shaft is arranged on the base in a penetrating manner through a central bearing, a support is arranged outside the base, a rear cover plate is sleeved on the base through a rear bearing, the support and the rear cover plate are arranged at an interval, and a front cover plate is sleeved on the central shaft through a front bearing. An outer gear ring driven by a power mechanism is connected between the front cover plate and the rear cover plate, and a cavity is defined by the front cover plate, the rear cover plate and the outer gear ring; the center shaft is further sleeved with a planet carrier mechanism which is located in the cavity and meshed with the outer gear ring, a front elastic mechanism is arranged on the planet carrier mechanism, and a rear elastic mechanism is arranged on the rear cover plate. A hub is further installed on the planet carrier mechanism, and a plurality of electromagnetic coil sets enabling the rear elastic mechanism to be attracted to or separated from the hub and enabling the front elastic mechanism to be attracted to or separated from the support are arranged in the hub. By arranging the planet carrier mechanism and other structures, the output rotation direction can be changed when the input rotation direction is not changed.

Description

Technical Field

[0001] The utility model relates to the technical field of engines, in particular to a pulley structure with replaceable output rotation direction. Background Art

[0002] At present, under normal circumstances, the mechanical structure requires the output shaft to have a reversible rotation function. For example, the fan used in the engine product of agricultural machinery is in the suction state during normal operation, but when too much grass is accumulated on the radiator due to operation, the fan needs to be switched to the blowing state to blow away the accumulated grass to prevent a significant impact on the heat dissipation of the whole machine. For example, in the prior art, the patent with announcement number CN116576012A, see Figure 5 , discloses a safe electromagnetic reversing fan device and a control method thereof, and relates to the technical field of vehicle cooling fans, including a fan, a first clutch and a second clutch, wherein the fan is mounted on the first clutch, the first clutch and the second clutch are connected by a transmission belt, the first clutch includes a first driving wheel, a first passive wheel, and a first electromagnetic clutch device, the first electromagnetic clutch device includes a first suction disk, a first spring sheet, and a first iron core component, the first iron core component includes an iron core outer ring, an iron core inner ring, an iron core bracket, a permanent magnet and a first coil; the safe electromagnetic reversing fan device provided by the present invention, when a vehicle circuit fails, the fan only fails to meet the reverse cleaning function, and does not affect the fan's heat dissipation function for the engine, that is, the vehicle can still work normally, and compared with the prior art, the power loss is reduced, and the degree of influence of the vehicle circuit failure on the vehicle operation is also reduced. However, this scheme uses two pulleys and two sets of belts to achieve reversing, which requires a larger space, and has certain restrictions on the process during actual use and installation. Utility Model Content

[0003] In view of the above-mentioned shortcomings of the prior art, the technical problem to be solved by the utility model is to provide a pulley structure with replaceable output rotation direction, which adopts an integrated design to achieve the ability to change the output rotation direction while keeping the input rotation direction unchanged.

[0004] In order to solve the above technical problems, the utility model includes a base, and its structural characteristics are that the base is provided with a central shaft through a central bearing, a bracket is installed on the outside, and a rear cover plate is installed through a rear bearing, the bracket and the rear cover plate are arranged at intervals, the central shaft is provided with a front cover plate through a front bearing, an outer gear ring driven by a power mechanism is connected between the front cover plate and the rear cover plate, and a cavity is surrounded by the front cover plate, the rear cover plate and the outer gear ring; the central shaft is also provided with a planetary carrier mechanism located in the cavity and meshing with the outer gear ring, the planetary carrier mechanism is provided with a front elastic mechanism, and the rear cover plate is provided with a rear elastic mechanism; the planetary carrier mechanism is also provided with a wheel hub, and the wheel hub is provided with multiple groups of electromagnetic coil groups that respectively make the rear elastic mechanism engage or disengage with the wheel hub, and the front elastic mechanism engage or disengage with the bracket. The utility model adopts an integrated design to achieve the change of output rotation direction when the input rotation direction remains unchanged.

[0005] After adopting the above structure, when the power mechanism is working, the power input acts on the outer gear ring, so that the outer gear ring always rotates in a certain direction; when the electromagnetic coil group close to the rear cover plate is energized and the electromagnetic coil group close to the front cover plate is de-energized, the rear elastic mechanism and the wheel hub are attracted, and the outer gear ring is rigidly connected with the planetary gear mechanism through the rear cover plate, the rear elastic mechanism, the wheel hub, and finally the power is transmitted to the intermediate shaft through the planetary gear mechanism. At this time, there is no relative movement between the gears in the planetary gear mechanism. Therefore, the rotation direction of the intermediate shaft and the rotation direction and speed of the outer gear ring are uniform. When the electromagnetic coil group near the front cover is energized, the electromagnetic coil group near the rear cover is de-energized, the rear elastic mechanism is disengaged from the wheel hub, and the front elastic mechanism is attracted to the bracket. At this time, the planetary gear mechanism is rigidly connected with the base through the front elastic mechanism, the bracket, and the planetary gear mechanism is in a fixed and stationary state relative to the base. The external gear of the planetary gear mechanism is meshed with the outer gear ring and has the same rotation direction, while the internal gear is meshed with the internal gear and has the opposite rotation direction. Therefore, the rotation direction of the intermediate shaft is opposite to that of the outer gear ring, and the speed ratio is the ratio of the number of teeth of the outer gear ring to the sun gear.

[0006] Preferably, the planetary carrier mechanism includes a planetary carrier and a sun gear mounted on a central shaft, the planetary carrier is mounted on a bracket via a support bearing, a plurality of planetary gears are mounted on the planetary carrier and are meshed with the sun gear, and the planetary gears are also meshed with an outer gear ring.

[0007] Preferably, the front elastic mechanism comprises a front friction plate mounted on the planet carrier, and a front spring plate is arranged between the front friction plate and the planet carrier.

[0008] Preferably, the rear elastic mechanism comprises a rear friction plate mounted on the rear cover plate, and a rear spring plate is arranged between the rear friction plate and the rear cover plate.

[0009] Preferably, the number of the electromagnetic coil groups is set to two groups, including a front electromagnetic coil and a rear electromagnetic coil that are axially spaced apart, and the front electromagnetic coil and the rear electromagnetic coil are located between the wheel hub and the bracket.

[0010] Preferably, a front sealing sleeve is provided between the front cover plate and the central axis, and the front sealing sleeve is aligned with the outer end surface of the front cover plate.

[0011] Preferably, a rear sealing sleeve is provided between the rear cover plate and the base, and the rear sealing sleeve is aligned with the outer end surface of the rear cover plate.

[0012] Preferably, the outer surfaces of the front bearing and the front sealing sleeve are aligned and spaced apart in the axial direction, and the front cover plate is sleeved on the front bearing and the front sealing sleeve.

[0013] Preferably, the outer surfaces of the rear bearing and the rear sealing sleeve are aligned, and the rear cover plate is sleeved on the rear bearing and the rear sealing sleeve.

[0014] Preferably, there is an axial distance between the rear bearing and the rear sealing sleeve.

[0015] The utility model is connected with the wheel hub by arranging the planet carrier of the planetary gear mechanism, and installing the front friction plate on the planet carrier and arranging the front spring plate between the two, and installing the rear friction plate on the rear cover plate and arranging the rear spring plate between the two, so as to realize the attraction or disconnection of the wheel hub and the rear cover plate, and the attraction or disconnection of the planet carrier and the bracket, so as to realize the output reversing by adopting a set of belts, that is, the output rotation direction can be changed under the condition that the input rotation direction remains unchanged, and no large space is required; by arranging the front electromagnetic coil and the rear electromagnetic coil, the front electromagnetic coil is close to the bracket, and the rear electromagnetic coil is close to the rear end of the wheel hub, so as to ensure that the front friction plate can be attracted with the bracket or the rear friction plate can be attracted with the wheel hub under the action of the corresponding electromagnetic coil, so as to achieve the opposite or same rotation direction of the intermediate shaft and the outer gear ring; by arranging the front sealing sleeve, the sealing between the front cover plate and the central shaft is ensured; by arranging the rear sealing sleeve, the sealing between the rear cover plate and the base is ensured; by arranging the outer gear ring, by arranging the front spring plate and the rear spring plate, stable support is provided to prevent excessive vibration during attraction or disconnection. The utility model adopts an integrated design, and can change the output rotation direction while keeping the input rotation direction unchanged. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings that constitute part of this application are used to provide a further understanding of this application, so that other features, purposes and advantages of this application become more obvious. The schematic embodiment drawings and their descriptions of this application are used to explain this application and do not constitute an improper limitation on this application. In the drawings:

[0017] Figure 1 This is a schematic diagram of the structure of an embodiment of the utility model;

[0018] Figure 2 for Figure 1 The upper part is an enlarged schematic diagram of the structure;

[0019] Figure 3 This is a schematic diagram of the forward structure of the intermediate shaft of the utility model;

[0020] Figure 4 This is a schematic diagram of the reverse structure of the intermediate shaft of the utility model;

[0021] Figure 5 It is a structural schematic diagram of the prior art;

[0022] Figure 6 This is a schematic diagram of the structure of a planetary gear mechanism.

[0023] In the figure: 1-base, 2-center bearing, 3-center shaft, 4-front bearing, 5-front cover plate, 6-rear bearing, 7-rear cover plate, 8-bracket, 9-outer gear ring, 10-planetary gear mechanism, 1001-sun gear, 1002-planet carrier, 1003-planetary gear, 11-electromagnetic coil group, 1101-front electromagnetic coil, 1102-rear electromagnetic coil, 12-first belt, 13-second belt. DETAILED DESCRIPTION

[0024] In order to make the technical personnel in this field better understand the present application scheme, the following will be combined with the attached Figure 1-6 , a clear and complete description of the technical solutions in the embodiments of the utility model is given.

[0025] At present, usually, the mechanical structure requires the output shaft to have a reversible rotation function. For example, the fan used in the engine product of agricultural machinery is in the suction state during normal operation, but when too much grass is accumulated on the radiator due to operation, the fan needs to be switched to the blowing state to blow away the accumulated grass to prevent a significant impact on the heat dissipation of the whole machine. Figure 5, usually two pulleys and two sets of second belts 13 are used to achieve reversing, which requires a large space and has certain limitations on the process in actual use and installation. Therefore, a pulley structure with replaceable output rotation direction is provided, including a base, a central shaft is installed through a central bearing on the base, a bracket is installed on the outside, and a rear cover plate is installed through a rear bearing, the bracket and the rear cover plate are arranged at intervals, a front cover plate is installed on the central shaft through a front bearing, an outer gear ring driven by a power mechanism is connected between the front cover plate and the rear cover plate, and a cavity is surrounded by the front cover plate, the rear cover plate and the outer gear ring; the central shaft is also equipped with a planetary carrier mechanism located in the cavity and meshing with the outer gear ring, the planetary carrier mechanism is provided with a front elastic mechanism, and the rear elastic mechanism is provided on the rear cover plate; the planetary carrier mechanism is also equipped with a hub, and a plurality of electromagnetic coil groups are arranged in the hub to respectively make the rear elastic mechanism engage or disengage with the hub and the front elastic mechanism engage or disengage with the bracket. The utility model adopts an integrated design to achieve the change of output rotation direction while keeping the input rotation direction unchanged. After adopting the above structure, when the power mechanism is working, the power input acts on the outer gear ring, so that the outer gear ring always rotates in a certain direction; when the electromagnetic coil group near the rear cover plate is energized, and the electromagnetic coil group near the front cover plate is de-energized, the rear elastic mechanism and the wheel hub are attracted, and the outer gear ring is rigidly connected with the planetary gear mechanism through the rear cover plate, the rear elastic mechanism, and the wheel hub, and finally the power is transmitted to the intermediate shaft through the planetary gear mechanism. At this time, there is no relative movement between the gears in the planetary gear mechanism, so the rotation direction of the intermediate shaft is uniform with the rotation direction and speed of the outer gear ring. When the electromagnetic coil group near the front cover is energized, the electromagnetic coil group near the rear cover is de-energized, the rear elastic mechanism is disengaged from the wheel hub, and the front elastic mechanism is attracted to the bracket. At this time, the planetary gear mechanism is rigidly connected with the base through the front elastic mechanism, the bracket, and the planetary gear mechanism is in a fixed and stationary state relative to the base. The external gear of the planetary gear mechanism is meshed with the outer gear ring and has the same rotation direction, while the internal gear is meshed with the internal gear and has the opposite rotation direction. Therefore, the rotation direction of the intermediate shaft is opposite to that of the outer gear ring, and the speed ratio is the ratio of the number of teeth of the outer gear ring to the sun gear.

[0026] An embodiment is now used to describe the above scheme in detail. For the convenience of description, Figure 1 The left and right directions are set to the horizontal direction, the left side is set to the front side, and the right side is set to the rear side.

[0027] A pulley structure with replaceable output rotation direction comprises a base 1, a central shaft 3 is mounted on the base 1 through a central bearing 2, a planetary gear mechanism 10 is mounted on the central shaft 3, a front cover plate 5 is mounted on the end through a front bearing 4, a rear cover plate 7 is mounted on the base 1 through a rear bearing 6, a bracket 8 is mounted on the end, an outer gear ring 9 is connected between the front cover plate 5 and the rear cover plate 7, the front end of the outer gear ring 9 is rigidly connected to the front cover plate 5, the rear end of the outer gear ring 9 is rigidly connected to the rear cover plate 7, and a first belt 12 driven by a power mechanism is mounted on the outer gear ring 9; the front cover plate 5, the rear cover plate 7 and the outer gear ring 9 form a cavity, the planetary gear mechanism 10 is located in the cavity, the planetary gear mechanism 10 is meshed with the outer gear ring 9, the planetary gear mechanism 10 is connected to a hub, the planetary gear mechanism 10, the bracket 8, the base 1 and the hub form an electromagnetic space, and an electromagnetic coil group 11 located in the electromagnetic space is mounted on the base 1; the outer gear ring forms a pulley structure with the front cover plate, the rear cover plate and the planetary gear mechanism. The base 1 includes a chassis and a chassis arranged at the center of the chassis. The chassis is set as a cylindrical structure, and its outer surface is set as a step shape. From left to right, it is sequentially arranged as a first support section, a second support section, a third support section and a fourth support section. The outer diameter of the first support section is smaller than the outer diameter of the second support section, the outer diameter of the second support section is smaller than the outer diameter of the third support section, and the outer diameter of the third support section is smaller than the outer diameter of the fourth support section; the fourth support section is connected to the chassis; the third support section is provided with the above-mentioned rear bearing 6, the fourth support section is provided with a rear sealing sleeve, and the rear bearing 6 and the rear sealing sleeve are provided with the above-mentioned rear cover plate 7. The outer surfaces of the rear bearing 6 and the rear sealing sleeve are aligned to facilitate the installation of the rear cover plate 7. In addition, there is an axial spacing between the rear bearing 6 and the rear sealing sleeve to leave space for the lubricating oil splashed from the rear bearing 6, ensuring the sealing of the installation position of the rear cover plate 7 and the base 1, that is, the rear cover plate 7 is installed on the third support section of the base 1 through the rear bearing 6, and the right end face of the rear sealing sleeve is aligned with the right end face of the rear cover plate 7; the first support section is sleeved with a bracket 8, and the bracket 8 includes a support plate sleeved on the first support section and a support cylinder connected thereto, and the planetary gear mechanism 10 is sleeved on the outer surface of the support cylinder through a support bearing. Figure 1 , 26. The planetary gear mechanism 10, i.e., the planetary gear train, refers to an epicyclic gear train with only one degree of freedom. The planetary gear train is a coaxial transmission device (i.e., the output axis coincides with the input axis), and uses several identical planetary gears evenly distributed around the central sun gear 1001. The planetary gear mechanism 10 in this scheme includes a planet carrier 1002, which is mounted on the support cylinder of the bracket 8 through a support bearing. A front elastic mechanism is provided between the planet carrier 1002 and the support disk of the bracket 8, and the front elastic mechanism includes a set The front friction plate on the bracket 8 is sleeved on the support tube of the bracket 8 and is installed on the planetary carrier 1002 through the front spring plate and bolts to ensure that the front friction plate can be attracted to the bracket 8; the above-mentioned planetary gear mechanism 10 also includes a sun gear 1001 interference-mounted on the central shaft 3, and the planetary carrier 1002 is equipped with multiple planetary gears 1003 that are arranged around the sun gear 1001 and meshed with it. The planetary gears 1003 are sleeved on the planetary gear 1003 shaft of the planetary carrier 1002 and meshed with the outer gear ring 9. The above-mentioned wheel hub is also installed between the planetary carrier 1002 and the rear cover plate 7. The front end of the wheel hub is connected to the planetary carrier 1002 by bolts, and the rear end of the wheel hub is provided with a rear elastic mechanism, which includes a rear friction plate sleeved on the second supporting section of the base 1, and a rear spring plate is provided between the rear friction plate and the wheel hub, so that the rear friction plate can be attracted to the wheel hub; the above-mentioned electromagnetic space is formed between the planetary carrier 1002, the wheel hub, the bracket 8 and the base 1, and multiple groups of electromagnetic coil groups 11 sleeved on the central axis 3 are provided in the electromagnetic space, and the multiple groups of electromagnetic coil groups 11 are axially spaced along the central axis 3. Preferably, the number of electromagnetic coils is set to two groups, which are respectively set to the front electromagnetic coil 1101 and the rear electromagnetic coil 1102, the front electromagnetic coil 1101 is close to the bracket 8, and the rear electromagnetic coil 1102 is close to the rear end of the wheel hub, so as to ensure that under the action of the corresponding electromagnetic coil, the front friction plate can be attracted to the bracket 8 or the rear friction plate can be attracted to the wheel hub, so as to achieve opposite or same rotation directions of the intermediate shaft and the outer gear ring 9.

[0028] An axis mounting hole is provided at the center of the above-mentioned base frame, and the axis mounting hole passes through the first support section and the second support section and extends to the third support section. The center axis 3 is installed in the axis mounting hole through the center bearing 2; the center axis 3 is arranged in a stepped shape, and is arranged as the first axis, the second axis and the third axis from left to right, the diameter of the first axis is smaller than the diameter of the second axis, and the diameter of the second axis is smaller than the diameter of the third axis; an external load is mounted on the first axis, that is, the external load is mounted on the front end of the center axis 3 and is rigidly connected to the center axis 3; the above-mentioned front cover plate 5 is mounted on the second axis through the front bearing 4, and a front mounting hole is provided at the center of the front cover plate 5, and the outer surface of the front bearing 4 matches the front mounting hole, and the second axis is also provided with a front cover plate 5. A front sealing sleeve is mounted on the front bearing 4 and the front sealing sleeve, and the front cover plate 5 is mounted on the front bearing 4 and the front sealing sleeve. The outer surfaces of the front bearing 4 and the front sealing sleeve are aligned, that is, the outer diameters are the same, so as to facilitate the installation of the rear cover plate 7. In addition, the front sealing sleeve is located in front of the front bearing 4 and there is a gap between them in the axial direction, so as to leave space for the lubricating oil splashed from the front bearing 4, so as to ensure the sealing of the installation position of the front cover plate 5 and the central shaft 3, that is, the front cover plate 5 is installed on the second shaft of the central shaft 3 through the front bearing 4, and the front end face of the front sealing sleeve is aligned with the front end face of the front cover plate 5; the central bearing 2 is mounted on the third shaft, and the central shaft 3 is installed in the shaft mounting hole of the base 1 through the central bearing 2. The above-mentioned moving parts are lubricated by grease, and sealed by the front sealing sleeve and the rear sealing sleeve.

[0029] During operation, first, the power mechanism inputs power to the outer gear ring 9 through the first belt 12, so that the outer gear ring 9 always rotates in a certain direction; then, when the rear electromagnetic coil 1102 on the right is energized and the front electromagnetic coil 1101 on the left is de-energized, the rear friction plate is attracted to the wheel hub, and the outer gear ring 9 is rigidly connected to the planetary carrier 1002 through the rear cover plate 7, the rear spring plate, the rear friction plate, the wheel hub, and finally transmits power to the intermediate shaft through the sun gear 1001. At this time, there is no relative movement between the sun gear 1001 and the planetary gears 1003 of the planetary gear mechanism 10. Therefore, the sun gear 1001 and the intermediate shaft The rotation direction of the intermediate shaft is consistent with the rotation direction and speed of the outer ring gear 9; when the front electromagnetic coil 1101 is energized and the rear electromagnetic coil 1102 is de-energized, the rear friction plate is disengaged from the wheel hub, and the front friction plate is attracted to the bracket 8. At this time, the planetary carrier 1002 is rigidly connected with the base 1 through the front spring plate, the front friction plate, and the bracket 8. The planetary carrier 1002 is in a fixed and stationary state relative to the base 1, the planetary gears are meshed with the outer ring gear 9 and have the same rotation direction, while the sun gear 1001 is meshed with the planetary gears and has an opposite rotation direction. Therefore, the rotation direction of the intermediate shaft is opposite to that of the outer ring gear 9, and the speed ratio is the ratio of the number of teeth of the outer ring gear 9 to the sun gear 1001. The utility model connects the planet carrier 1002 of the planetary gear mechanism 10 with the wheel hub, installs a front friction plate on the planet carrier 1002 and a front spring plate between the two, installs a rear friction plate on the rear cover plate 7 and a rear spring plate between the two, so as to realize the attraction or disconnection of the wheel hub and the rear cover plate 7, and the attraction or disconnection of the planet carrier 1002 and the bracket 8, so as to realize output reversing by using a set of belts, that is, the output rotation direction can be changed when the input rotation direction remains unchanged, and no large space is required; by arranging the front electromagnetic coil 1101 and the rear electromagnetic coil 1102, the output rotation direction can be changed, and a large space does not need to be occupied. 02, the front electromagnetic coil 1101 is close to the bracket 8, and the rear electromagnetic coil 1102 is close to the rear end of the wheel hub, so as to ensure that under the action of the corresponding electromagnetic coil, the front friction plate can be attracted to the bracket 8 or the rear friction plate can be attracted to the wheel hub, so as to achieve the opposite or same rotation direction of the intermediate shaft and the outer gear ring 9; by setting the front sealing sleeve, the sealing between the front cover plate 5 and the central shaft 3 is ensured; by setting the rear sealing sleeve, the sealing between the rear cover plate 7 and the base 1 is ensured; by setting the outer gear ring 9, by setting the front spring sheet and the rear spring sheet, stable support is provided to prevent excessive vibration when attracting or disconnecting. The utility model adopts an integrated design to achieve the change of output rotation direction when the input rotation direction remains unchanged.

[0030] The above contents are merely examples and explanations of the structure of the utility model. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the utility model or exceed the scope defined by the utility model, they should all fall within the protection scope of the utility model.

Claims

1. A pulley structure with a changeable output rotation direction, comprising a base (1), characterized in that: The base (1) is provided with a central shaft (3) through a central bearing (2), a bracket (8) is installed on the outside, and a rear cover plate (7) is sleeved through a rear bearing (6), the bracket (8) and the rear cover plate (7) are arranged at intervals, a front cover plate (5) is sleeved on the central shaft (3) through a front bearing (4), an outer gear ring (9) driven by a power mechanism is connected between the front cover plate (5) and the rear cover plate (7), and the front cover plate (5), the rear cover plate (7) and the outer gear ring (9) are ) is surrounded by a cavity; the central shaft (3) is also provided with a planetary gear mechanism (10) located in the cavity and meshing with the outer gear ring (9); the planetary gear mechanism (10) is provided with a front elastic mechanism, and the rear cover plate (7) is provided with a rear elastic mechanism; the planetary gear mechanism (10) is also provided with a wheel hub, and the wheel hub is provided with a plurality of electromagnetic coil groups (11) for respectively causing the rear elastic mechanism to engage or disengage with the wheel hub and the front elastic mechanism to engage or disengage with the bracket (8).

2. The pulley structure with replaceable output rotation direction according to claim 1, characterized in that: The planetary gear mechanism (10) comprises a planet carrier (1002) and a sun gear (1001) sleeved on a central shaft (3); the planet carrier (1002) is mounted on a bracket (8) via a support bearing; a plurality of planetary gears (1003) are mounted on the planet carrier (1002) and are arranged around the sun gear (1001) and meshed with the sun gear (1001); the planetary gears (1003) are also meshed with an outer gear ring (9).

3. The pulley structure with replaceable output rotation direction according to claim 2, characterized in that: The front elastic mechanism comprises a front friction plate mounted on the planet carrier (1002), and a front spring plate is arranged between the front friction plate and the planet carrier (1002).

4. The pulley structure with replaceable output rotation direction according to claim 1, characterized in that: The rear elastic mechanism comprises a rear friction plate mounted on the rear cover plate (7), and a rear spring plate is arranged between the rear friction plate and the rear cover plate (7).

5. The pulley structure with replaceable output rotation direction according to claim 1, characterized in that: The number of the electromagnetic coil groups (11) is set to two groups, including a front electromagnetic coil (1101) and a rear electromagnetic coil (1102) arranged axially at intervals, and the front electromagnetic coil (1101) and the rear electromagnetic coil (1102) are located between the wheel hub and the bracket (8).

6. The pulley structure with replaceable output rotation direction according to claim 1, characterized in that: A front sealing sleeve is provided between the front cover plate (5) and the central shaft (3), and the front sealing sleeve is arranged to be aligned with the outer end surface of the front cover plate (5).

7. The pulley structure with replaceable output rotation direction according to claim 6, characterized in that: The outer surfaces of the front bearing (4) and the front sealing sleeve are arranged in alignment and have an axial spacing, and the front cover plate (5) is sleeved on the front bearing (4) and the front sealing sleeve.

8. The pulley structure with replaceable output rotation direction according to claim 1, characterized in that: A rear sealing sleeve is provided between the rear cover plate (7) and the base (1), and the rear sealing sleeve is arranged to be aligned with the outer end surface of the rear cover plate (7).

9. The pulley structure with replaceable output rotation direction according to claim 8, characterized in that: The outer surfaces of the rear bearing (6) and the rear sealing sleeve are aligned, and the rear cover plate (7) is sleeved on the rear bearing (6) and the rear sealing sleeve.

10. The pulley structure with replaceable output rotation direction according to claim 9, characterized in that: The rear bearing (6) and the rear sealing sleeve have an axial spacing.

Images