Transmission device, driving system and elevator

Abstract

The utility model relates to a transmission device, a driving system and an elevator. The transmission device comprises an input shaft and an output shaft, one end of the input shaft is provided with an input gear, two reversing gears are supported on the output shaft in a relatively rotating mode, and the input gear is meshed with the two reversing gears so that the two reversing gears can rotate in the opposite rotating directions. The transmission device further comprises a reversing mechanism, the reversing mechanism can be switched among a first reversing position, an idling position and a second reversing position, and in the first reversing position, the reversing mechanism enables the output shaft to be connected with the first reversing gear; in the second reversing position, the reversing mechanism enables the output shaft to be connected with a second reversing gear; and in the idle position, the two reversing gears can freely rotate relative to the output shaft. The transmission device has the advantages of being simple in structure, easy to maintain, high in reliability, high in adaptability and capable of stably working in various complex environments, and shows superiority in multiple application fields.

Description

Technical Field

[0001] This application relates to the technical field of elevators, particularly to the drive system of elevators, and more particularly to the transmission device in the drive system. Background Art

[0002] A transmission device with a commutation function is a device widely used in various mechanical systems. Its main function is to change the movement direction of mechanical components or the transmission direction of force when needed. This kind of transmission device has important applications in fields such as automobiles, robots, and industrial machinery. In the existing technology, the transmission device with a commutation function is mainly realized by mechanical, hydraulic, or electrical means. Mechanical commutation usually includes mechanical elements such as gears, cams, and linkages, and changes the transmission direction of force through the interaction of these elements. Hydraulic commutation uses the pressure change of the hydraulic system to control commutation, while electrical commutation is achieved through electrical components such as solenoid valves.

[0003] Mechanical commutation is widely used because of its simple structure and high reliability. However, this kind of device often has disadvantages such as large volume, heavy weight, slow response speed, etc. In addition, mechanical wear will also cause its performance to decline and require frequent maintenance.

[0004] Hydraulic commutation realizes commutation through the pressure change of the hydraulic system, and has the advantages of fast response speed and high control precision. However, the hydraulic system itself is complex, with high maintenance costs, and has poor adaptability to the environment, and is easily affected by temperature and pollution.

[0005] Electrical commutation controls commutation through electrical components such as solenoid valves, and has the advantages of simple structure and flexible control. However, the reliability and lifespan of electrical components are often affected by environmental factors, especially in environments with high temperature, high humidity, or corrosive gases.

[0006] Although the existing transmission devices with a commutation function perform well in some applications, they still have some common problems, such as complex structure, difficult maintenance, slow response speed, high cost, etc. Therefore, developing a transmission device with a commutation function that has a simple structure and high reliability, which can not only overcome the deficiencies of the existing technology but also work stably in various complex environments, has important practical significance. Utility Model Content

[0007] Therefore, the purpose of this application is to solve or at least alleviate at least some of the problems existing in the prior art.

[0008] One aspect of the present application is to provide a transmission device, the transmission device comprising: a rotatable input shaft, one end of the input shaft having an input gear; and a rotatable output shaft, wherein a first reversing gear and a second reversing gear are rotatably supported relative to the output shaft, wherein the input gear meshes with the first reversing gear and the second reversing gear, such that the first reversing gear and the second reversing gear rotate in opposite rotational directions, the transmission device further comprising a reversing mechanism capable of switching between a first reversing position, an idling position, and a second reversing position, wherein: in the first reversing position, the reversing mechanism causes the output shaft to engage with the first reversing gear, such that the first reversing gear drives the output shaft to rotate; in the second reversing position, the reversing mechanism causes the output shaft to engage with the second reversing gear, such that the second reversing gear drives the output shaft to rotate; and in the idling position, the first reversing gear and the second reversing gear are capable of freely rotating relative to the output shaft.

[0009] In a transmission device with a reversing function known in the prior art, the reversing gears are usually non-rotatably fixed to the output shaft, and the input gear does not permanently mesh with the reversing gears. Instead, in the idling position, the input gear disengages from both reversing gears, whereby the input shaft can freely rotate relative to the output shaft. When transmission is required, it is usually necessary to move the position of the input shaft or the output shaft or move the position of the input gear or the reversing gear, such that the input gear meshes with one of the two reversing gears, thereby enabling the output shaft to rotate in two different rotational directions. However, in such a transmission device, on the one hand, the mechanism for moving the input shaft or the output shaft or for moving the input gear or the reversing gear and the mechanism for supporting the movable input shaft or output shaft or for supporting the movable input gear or output gear are very complex. On the other hand, the input gear needs to repeatedly mesh with and disengage from the reversing gears, thereby causing repeated impacts on the teeth of the input gear and the reversing gears. Therefore, the service life of such a transmission device is short and the maintenance cost is very high.

[0010] In contrast, in the transmission device according to the present application, both reversing gears are rotatably supported on the output shaft. In other words, both reversing gears can rotate freely relative to the output shaft. In addition, the input gear is permanently engaged with both reversing gears simultaneously. In other words, during the reversing process, it is not necessary to repeatedly engage and disengage the input gear with the two reversing gears, and thus it is not necessary to move the entire input shaft or output shaft to achieve the engagement between the input gear and the reversing gears. To achieve reversing, it is only necessary to switch the position of the reversing mechanism so that one of the two reversing gears engages with the output shaft, and thus the output shaft can be driven to rotate by one of the reversing gears and the rotational movement can be transmitted from one of the reversing gears to the output shaft. Since it is not necessary to move the input shaft or output shaft and it is also not necessary to move the input gear or reversing gears in the transmission device according to the present application, the structure of the transmission device is significantly simplified. In addition, since the input gear does not need to be repeatedly engaged and disengaged with the reversing gears, the service life of the input gear and the reversing gears is significantly extended and the maintenance cost is reduced.

[0011] Optionally, the reversing mechanism includes: a reversing push rod which is axially movably supported in a push rod hole in the output shaft, so that the reversing mechanism can be switched between the first reversing position, the idling position and the second reversing position; and a stop block which is supported on the reversing push rod and can be axially moved by the reversing push rod. Wherein, in the first reversing position, the stop block causes the output shaft to engage with the first reversing gear, and in the second reversing position, the stop block causes the output shaft to engage with the second reversing gear.

[0012] Thus, it is only necessary to move the reversing push rod which is axially movably supported in the push rod hole in the output shaft to achieve the engagement between one of the reversing gears and the output shaft, so that the rotational movement from the input shaft can be selectively transmitted to the output shaft along one of two opposite rotational directions. It is not necessary to move the input shaft or the output shaft itself here, nor to move the input gear supported on the input shaft or the reversing gears supported on the output shaft, and thus reliable reversing is achieved with a simple structure.

[0013] Optionally, the output shaft has a chute extending in the axial direction, and the stop block projects radially outward from the inside of the push rod hole through the chute and can move axially relative to the output shaft but cannot rotate relative to the output shaft.

[0014] Optionally, the reversing mechanism includes a plurality of stop blocks and the output shaft has the same number of chutes, wherein the chutes are evenly distributed along the circumferential direction of the output shaft.

[0015] Optionally, the first reversing gear is non-rotatably fixed to the first gear seat and is rotatably supported on the output shaft via the first gear seat, and the second reversing gear is non-rotatably fixed to the second gear seat and is rotatably supported on the output shaft via the second gear seat. Wherein, the first gear seat and the second gear seat respectively have a supporting section and an engaging section, and the first gear seat and the second gear seat are respectively rotatably supported on the output shaft through the supporting section and can be respectively engaged with the stop block through the engaging section.

[0016] It should be noted here that the gear seat is not necessary. The first reversing gear and / or the second reversing gear can also be directly rotatably supported on the output shaft. Thereby, the number of parts of the transmission device can be reduced and the cost can be lowered. However, by using the gear seat, on the one hand, the structure of the reversing gear can be simplified, and on the other hand, the impact force generated during the engagement process can be borne by the gear seat, thereby protecting the reversing gear and prolonging the service life of the reversing gear. In this way, when the structure engaged with the output shaft is damaged, only the gear seat needs to be replaced without replacing the entire reversing gear.

[0017] Optionally, the inner surfaces of the engaging sections of the first gear seat and the second gear seat respectively have at least one retaining rib. Wherein, in the first reversing position, the stop block is engaged with the retaining rib of the first reversing gear, and in the second reversing position, the stop block is engaged with the retaining rib of the second reversing gear.

[0018] Optionally, the inner surfaces of the engaging sections of the first gear seat and the second gear seat respectively have a plurality of retaining ribs uniformly distributed in the circumferential direction.

[0019] Optionally, the supporting sections of the first gear seat and the second gear seat are directly supported on the output shaft or are supported on the output shaft via bearings. Optionally, the bearing is a rolling bearing or a sliding bearing.

[0020] It should be noted here that when the reversing gear is directly rotatably supported on the output shaft, the supporting section and the engaging section are constituted by the inner circumferential surface of the reversing gear, and the retaining rib is arranged on the inner circumferential surface of the reversing gear.

[0021] Optionally, the first reversing gear is fixed to the first gear seat by interference fit, key connection, dowel pin connection or welding; and / or the second reversing gear is fixed to the second gear seat by interference fit, key connection, dowel pin connection or welding.

[0022] Optionally, the input shaft and the input gear are configured as an integral gear shaft.

[0023] Optionally, the outer peripheral surface of the reversing push rod has a recessed notch, and the stopper is positioned in the notch such that the stopper cannot move axially relative to the reversing push rod but can rotate relative to the reversing push rod. Alternatively, the outer peripheral surface of the reversing push rod has two axially spaced protruding axial retaining rings, and the stopper is positioned between the axial retaining rings such that the stopper cannot move axially relative to the reversing push rod but can rotate relative to the reversing push rod.

[0024] Since the stopper can rotate relative to the reversing push rod, the reversing push rod can remain circumferentially stationary throughout the process, that is, it does not rotate with the reversing gear and the output shaft, so it can be directly connected to an external operating mechanism.

[0025] Optionally, the stopper is formed by a key, a cylindrical roller or a spherical ball.

[0026] Optionally, the output shaft has an axial positioning structure configured to prevent the first reversing gear and the second reversing gear from moving axially.

[0027] Optionally, the axial positioning structure is a positioning step and / or a positioning groove and / or a positioning snap ring.

[0028] Optionally, the reversing push rod has three positioning grooves arranged in sequence in the axial direction, and the positioning screw can be respectively inserted into one of the positioning grooves in the first reversing position, the idling position and the second reversing position. Through the positioning screw and the positioning groove, the reversing push rod can be held in the first reversing position, the idling position or the second reversing position.

[0029] Optionally, the input gear, the first reversing gear and the second reversing gear are selected from the following gears: straight bevel gear; spiral bevel gear; cycloidal bevel gear.

[0030] Optionally, the input shaft and the output shaft are oriented perpendicular to each other.

[0031] Optionally, the reversing push rod can be operatively connected to an actuator, and the actuator causes the reversing push rod to move axially, so that the reversing mechanism can be switched between the first reversing position, the idling position and the second reversing position.

[0032] Another aspect of the present application is to provide a drive system having a driving device and the transmission device, wherein the input shaft or the output shaft of the transmission device can be driven to rotate by the driving device. That is to say, the functions of the input shaft and the output shaft of the transmission device can be interchanged. Instead of driving the output shaft to rotate via the reversing gear by the input shaft, the output shaft can also drive the input shaft to rotate via the reversing gear.

[0033] Another aspect of the present application is to provide a lift having the drive system, wherein the lift can be driven to rise or fall by the drive system.

[0034] The transmission device of the present application has the following characteristics: simple structure, easy to maintain, high reliability, strong adaptability and can work stably in various complex environments, and it shows its superiority in multiple application fields. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The embodiments of the present application will be further described in detail below with reference to the drawings. However, those skilled in the art will understand that these drawings are only for the purpose of explaining the embodiments and should not be construed as limiting the scope of the present application. The drawings show:

[0036] Figure 1 is a transmission device according to an embodiment of the present application;

[0037] Figure 2 is the output shaft of a transmission device according to an embodiment of the present application;

[0038] Figure 3 are the reversing gear and the gear seat of a transmission device according to an embodiment of the present application;

[0039] Figure 4 is a cross-sectional view of a transmission device according to an embodiment of the present application;

[0040] Figure 5a is a view of the transmission device in the first reversing position according to an embodiment of the present application;

[0041] Figure 5b is a view of the transmission device in the idling position according to an embodiment of the present application; and

[0042] Figure 5c is a view of the transmission device in the second reversing position according to an embodiment of the present application.

[0043] LIST OF REFERENCE NUMERALS:

[0044] 10 Input shaft

[0045] 11 Input gear

[0046] 20 Output shaft

[0047] 21 Push rod hole

[0048] 22 Slide groove

[0049] 23 Positioning step

[0050] 24 Positioning groove

[0051] 25 Output end

[0052] 30 Reversing push rod

[0053] 31 Positioning groove

[0054] 32 Positioning screw

[0055] 33 Stop block

[0056] 34 Notch

[0057] 41 First reversing gear

[0058] 42 First bearing

[0059] 43 First gear seat

[0060] 44 Second reversing gear

[0061] 45 Second bearing

[0062] 46 Second gear seat

[0063] 47 Retaining rib

[0064] 100 Transmission device. Specific embodiments

[0065] The following further describes in detail a preferred embodiment of the present application with reference to the accompanying drawings, but the present application is not limited to the shown preferred embodiment.

[0066] Figure 1 A transmission device 100 according to an embodiment of the present application is shown. It can be seen from Figure 1 that the transmission device 100 includes a rotatable input shaft 10, and one end of the input shaft 10 has an input gear 11. In Figure 1In the illustrated embodiment, the input shaft 10 and the input gear 11 are configured as an integral gear shaft. However, in an alternative, the input shaft 10 and the input gear 11 may also be separately manufactured components, in which case the input gear 11 can be fixedly connected to one end of the input shaft 10 in any known manner in the prior art. In addition, the transmission device 100 further includes a rotatable output shaft 20, on which a first reversing gear 41 and a second reversing gear 44 are rotatably supported relative to each other. Here, the input gear 11 meshes with the first reversing gear 41 and the second reversing gear 44, such that the first reversing gear 41 and the second reversing gear 44 can rotate in opposite rotational directions to each other. Here, the input gear 11, the first reversing gear 41, and the second reversing gear 44 may be straight bevel gears, spiral bevel gears, or cycloidal bevel gears. In addition, as can be seen from Figure 1 it can be seen that the input shaft 10 and the output shaft 20 are oriented substantially perpendicular to each other. When installed in a drive system having a drive device, the input shaft 10 of the transmission device 100 can be driven to rotate by the drive device of the drive system. Such a drive system can be used, for example, in a lift, such that the lift can be driven to rise or fall by the drive system via the transmission device 100. Here, it should be noted that the functions of the input shaft 10 and the output shaft 20 of the transmission device can be interchanged. Instead of driving the output shaft 20 to rotate via the reversing gears by the input shaft 10, the output shaft 20 can also drive the input shaft 10 to rotate via the reversing gears.

[0067] In Figure 1 the illustrated embodiment, the first reversing gear 41 is non-rotatably fixed to the first gear seat 43 and is rotatably supported on the output shaft 20 via the first gear seat 43, and the second reversing gear 44 is non-rotatably fixed to the second gear seat 46 and is rotatably supported on the output shaft 20 via the second gear seat 46. Here, the first reversing gear 41 and / or the second reversing gear 44 can be fixed to the first gear seat 43 and the second gear seat 46 respectively by interference fit, key connection, dowel pin connection, or welding. However, in an alternative, the first reversing gear 41 and / or the second reversing gear 44 can also be directly rotatably supported on the output shaft 20 without using a gear seat.

[0068] From Figure 1 it can be seen that the first gear seat 43 and the second gear seat 46 each have a support section and an engagement section, and the first gear seat 43 and the second gear seat 46 are rotatably supported on the output shaft 20 respectively by the support sections. InFigure 1 In the illustrated embodiment, the bearing sections of the first gear housing 43 and the second gear housing 46 are axially spaced apart by the engagement section of the first gear housing 43 and the second gear housing 46. Here, the bearing section of the first gear housing 43 is supported on the output shaft 20 via a first bearing 42, while the bearing section of the second gear housing 46 is supported on the output shaft 20 via a second bearing 45. In Figure 1 the illustrated embodiment, both the first bearing 42 and the second bearing 45 are sliding bearings. However, in an alternative, the first bearing 42 and / or the second bearing 45 can also be rolling bearings. Here, sliding bearings are suitable for high-speed applications, while rolling bearings are suitable for high-load applications. However, in an alternative, the bearing sections of the first gear housing 43 and / or the second gear housing 46 can also be directly supported on the output shaft 20 without using any bearings.

[0069] Here, in order to enable the output shaft 20 to rotate in two opposite rotational directions, the transmission device 100 further includes a reversing mechanism that can be switched between a first reversing position, an idling position, and a second reversing position, where: in the first reversing position, the reversing mechanism causes the output shaft 20 to engage with the first reversing gear 41, so that the first reversing gear 41 drives the output shaft 20 to rotate; in the second reversing position, the reversing mechanism causes the output shaft 20 to engage with the second reversing gear 44, so that the second reversing gear 44 drives the output shaft 20 to rotate; and in the idling position, the first reversing gear 41 and the second reversing gear 44 can rotate freely relative to the output shaft 20. As described above, since the input gear 11 can cause the first reversing gear 41 and the second reversing gear 44 to rotate in opposite rotational directions, in the first reversing position and the second reversing position, the first reversing gear 41 and the second reversing gear 44 can respectively cause the output shaft 20 to rotate in opposite rotational directions.

[0070] In Figure 1In the illustrated embodiment, the commutation mechanism includes: a commutation push rod 30 which is axially movably supported in a push rod hole 21 within the output shaft 20, such that the commutation mechanism can switch between the first commutation position, the idling position, and the second commutation position; and a stop block 33 which is supported on the commutation push rod 30 and can be axially moved by the commutation push rod 30. Wherein, in the first commutation position, the stop block 33 engages the output shaft 20 with the first commutation gear 41, and in the second commutation position, the stop block 33 engages the output shaft 20 with the second commutation gear 44. In Figure 1 In the illustrated embodiment, the stop block 33 is formed by a cylindrical roller. However, the stop block 33 can also be formed by a spherical ball or a key.

[0071] In Figure 1 In the illustrated embodiment, the outer peripheral surface of the commutation push rod 30 has a recessed notch 34, and the stop block 33 is positioned in the notch 34 such that the stop block 33 cannot move axially relative to the commutation push rod 30 but can rotate relative to the commutation push rod 30. Thus, when the commutation push rod 30 is axially moved, the commutation push rod 30 can drive the stop block 33 to move axially. However, the stop block 33 can rotate around the commutation push rod 30 unobstructed in the notch 34. Therefore, the commutation push rod 30 can remain circumferentially stationary throughout the process, that is, it does not rotate with the commutation gear and the output shaft 20, so it can be directly connected to an external operating mechanism. For example, the commutation push rod 30 can be connected to an actuator, and the actuator moves the commutation push rod 30 axially, such that the commutation mechanism can switch between the first commutation position, the idling position, and the second commutation position.

[0072] In an alternative, instead of the recessed notch 34, the outer peripheral surface of the commutation push rod 30 can have two axially spaced protruding axial retaining rings, and the stop block 33 is positioned between the axial retaining rings such that the stop block 33 cannot move axially relative to the commutation push rod 30 but can rotate relative to the commutation push rod 30. Thus, a function similar to that of the notch 34 can be achieved.

[0073] Next, the structure and working principle of the commutation mechanism will be described in more detail according to Figure 2 、 Figure 3 and Figure 4 wherein Figure 2 shows the output shaft 20 of a transmission device 100 according to an embodiment of the present application, Figure 3The reversing gear and gear seat of the transmission device 100 according to an embodiment of the present application are shown, and Figure 4 A cross-sectional view of the transmission device 100 according to an embodiment of the present application is shown.

[0074] As can be clearly seen from Figure 2 the left end of the output shaft 20 is the output end 25. A push rod hole 21 is provided at one end of the output shaft 20 opposite to the output end 25, and the reversing push rod 30 is axially movably supported in the push rod hole 21 in the output shaft 20. In addition, the output shaft 20 has a chute 22 extending in the axial direction. Here, the chute 22 opens into the push rod hole 21 in the radial direction, so that the stop block 33 can extend outward in the radial direction from the push rod hole 21 through the chute 22. Through the chute 22, the stop block 33 can move axially relative to the output shaft 20 but cannot rotate relative to the output shaft 20.

[0075] Here, the reversing mechanism may include a plurality of stop blocks 33 and the output shaft 20 may accordingly also have the same number of chutes 22. At this time, the chutes 22 may be evenly distributed along the circumferential direction of the output shaft 20. In Figure 4 the shown embodiment, it can be clearly seen that the reversing mechanism includes a total of four stop blocks 33, and accordingly the output shaft 20 has four chutes 22. However, according to requirements, different numbers of stop blocks 33 and chutes 22 may also be provided. In a simplest embodiment, only one stop block 33 and one chute 22 may be provided. In other embodiments, two stop blocks 33 and two chutes 22 or three stop blocks 33 and three chutes 22 may also be provided. Of course, it is not excluded that more than four stop blocks 33 and more than four chutes 22 may be provided.

[0076] Here, by axially moving the reversing push rod 30, the reversing push rod 30 can drive the stop block 33 to move axially, so that the stop block 33 can engage with the engaging section of the first gear seat 43 or the second gear seat 46.

[0077] The following refers to Figure 3 , Figure 3 the first reversing gear 41 and the first gear seat 43 are shown. The inner surface of the engaging section of the first gear seat 43 has a retaining rib 47, whereby in the first reversing position, the stop block 33 can engage with the retaining rib 47 of the first reversing gear 41. In Figure 3 and Figure 4In the illustrated embodiment, it can be seen that four retaining ribs 47 are provided and arranged evenly in the circumferential direction. The number of the retaining ribs 47 may be the same as the number of the stoppers 33. However, in the case where the number of the stoppers 33 is small, the number of the retaining ribs 47 may also be greater than the number of the stoppers 33.

[0078] Although not shown, those skilled in the art can understand that the second reversing gear 44 and the second gear seat 46 have structures corresponding to those of the first reversing gear 41 and the first gear seat 43.

[0079] Figure 4 A cross-sectional view of a transmission device 100 according to an embodiment of the present application is shown. The state in which the stopper 33 is engaged with the first gear seat 43 is shown herein. Thus, the first gear seat 43 can drive the output shaft 20 to rotate via the stopper 33.

[0080] Refer again to Figure 2 , in order to achieve axial positioning of the reversing gear, the output shaft 20 has an axial positioning structure, and the axial positioning structure is configured to prevent the first reversing gear 41 and the second reversing gear 44 from moving in the axial direction. As can be seen from Figure 1 and Figure 2 , the axial positioning structure includes a positioning step 23 in the middle and positioning grooves 24 on both sides of the positioning step 23, and positioning circlips can be installed in the positioning grooves 24. Those skilled in the art can understand that any other known technical means in the prior art can also be used to achieve axial positioning of the reversing gear.

[0081] Refer back again to Figure 1 , in order to position the reversing push rod 30 in the first reversing position, the idling position or the second reversing position, the reversing push rod 30 has three positioning grooves 31 arranged in sequence in the axial direction, and the positioning screw 32 can be respectively inserted into one of the positioning grooves 31 in the first reversing position, the idling position and the second reversing position. Thus, the reversing push rod 30 can be stably held in the first reversing position, the idling position or the second reversing position.

[0082] Finally refer to Figure 5a , Figure 5b and Figure 5c . Herein, Figure 5a , Figure 5b and Figure 5c respectively show views of the transmission device 100 in the first reversing position, the idling position and the second reversing position. Herein, the input shaft 10 is in Figure 5a , Figure 5b andFigure 5c All rotate in the same rotation direction. In Figure 5a , the transmission device 100 is in the first commutation position. At this time, the stopper 33 engages with the first gear seat 43, whereby the first commutation gear 41 drives the output shaft 20 to rotate in the first rotation direction. In Figure 5b , the transmission device 100 is in the idling position. At this time, the stopper 33 neither engages with the first gear seat 43 nor engages with the second gear seat 46. Thus, although both the first commutation gear 41 and the second commutation gear 44 are driven to rotate by the input gear 11, the output shaft 20 is not driven to rotate by the first commutation gear 41 and the second commutation gear 44, that is, the first commutation gear 41 and the second commutation gear 44 are in the idling state. In Figure 5c , the transmission device 100 is in the second commutation position. At this time, the stopper 33 engages with the second gear seat 46, whereby the second commutation gear 44 drives the output shaft 20 to rotate in the second rotation direction opposite to the first rotation direction.

[0083] The transmission device of the present application has the following characteristics: simple structure, easy to maintain, high reliability, strong adaptability and can work stably in various complex environments, and it shows its superiority in multiple application fields.

[0084] The above are only the preferred embodiments of the present application. The protection scope of the present application is not limited to the above embodiments. All technical solutions falling within the concept of the present application belong to the protection scope of the present application. It should be noted that for those of ordinary skill in the art in this technical field, several improvements and refinements made without departing from the principle of the present application should also be regarded as the protection scope of the present application.

Claims

1. A transmission device (100), the transmission device (100) comprising: A rotatable input shaft (10), one end of the input shaft (10) having an input gear (11); And A rotatable output shaft (20), wherein a first reversing gear (41) and a second reversing gear (44) are rotatably supported relative to the output shaft (20), wherein the input gear (11) meshes with the first reversing gear (41) and the second reversing gear (44), such that the first reversing gear (41) and the second reversing gear (44) rotate in opposite rotational directions. Characterized in that The transmission device (100) further comprises a reversing mechanism, the reversing mechanism being capable of switching between a first reversing position, an idling position and a second reversing position, wherein: In the first reversing position, the reversing mechanism causes the output shaft (20) to engage with the first reversing gear (41), so that the first reversing gear (41) drives the output shaft (20) to rotate; In the second reversing position, the reversing mechanism causes the output shaft (20) to engage with the second reversing gear (44), so that the second reversing gear (44) drives the output shaft (20) to rotate; and In the idling position, the first reversing gear (41) and the second reversing gear (44) are capable of freely rotating relative to the output shaft (20). Wherein, the reversing mechanism comprises: A reversing push rod (30), the reversing push rod (30) being axially movably supported in a push rod hole (21) in the output shaft (20), so that the reversing mechanism can switch between the first reversing position, the idling position and the second reversing position; and A stop block (33), the stop block (33) being supported on the reversing push rod (30) and capable of being axially moved by the reversing push rod (30). Wherein, the first reversing gear (41) is non-rotatably fixed to a first gear seat (43) by interference fit, key connection or dowel pin connection and is rotatably supported on the output shaft (20) via the first gear seat (43), and Wherein, the second reversing gear (44) is non-rotatably fixed to a second gear seat (46) by interference fit, key connection or dowel pin connection and is rotatably supported on the output shaft (20) via the second gear seat (46). Wherein, the first gear seat (43) and the second gear seat (46) respectively have a support section and an engagement section, the first gear seat (43) and the second gear seat (46) are respectively rotatably supported on the output shaft (20) by the support section and can respectively engage with the stop block (33) by the engagement section.

2. The transmission device (100) according to claim 1, characterized in that In the first commutation position, the stopper (33) causes the output shaft (20) to engage with the first commutation gear (41) via the first gear seat (43), and in the second commutation position, the stopper (33) causes the output shaft (20) to engage with the second commutation gear (44) via the second gear seat (46).

3. The transmission device (100) according to claim 1, wherein the output shaft (20) has a chute (22) extending in the axial direction, and the stopper (33) projects radially outward from within the push rod hole (21) via the chute (22) and is movable axially relative to the output shaft (20) but not rotatable relative to the output shaft (20).

4. The transmission device (100) according to claim 3, wherein the commutation mechanism includes a plurality of stoppers (33) and the output shaft (20) has the same number of chutes (22), wherein the chutes (22) are uniformly distributed along the circumferential direction of the output shaft (20).

5. The transmission device (100) according to claim 1, wherein the inner surfaces of the engaging sections of the first gear seat (43) and the second gear seat (46) respectively have at least one retaining rib (47), wherein, in the first commutation position, the stopper (33) engages with the retaining rib (47) of the first commutation gear (41), and in the second commutation position, the stopper (33) engages with the retaining rib (47) of the second commutation gear (44).

6. The transmission device (100) according to claim 1, wherein the supporting sections of the first gear seat (43) and the second gear seat (46) are directly supported on the output shaft (20) or supported on the output shaft (20) via bearings, wherein the bearings are rolling bearings or sliding bearings.

7. The transmission device (100) according to any one of claims 1 to 6, wherein the outer peripheral surface of the commutation push rod (30) has a recessed notch (34), and the stopper (33) is positioned in the notch (34) such that the stopper (33) cannot move axially relative to the commutation push rod (30) but can rotate relative to the commutation push rod (30); or the outer peripheral surface of the commutation push rod (30) has two axially spaced protruding axial retaining rings, and the stopper (33) is positioned between the axial retaining rings such that the stopper (33) cannot move axially relative to the commutation push rod (30) but can rotate relative to the commutation push rod (30).

8. The transmission device (100) according to any one of claims 1 to 6, wherein the commutation push rod (30) has three positioning grooves (31) arranged in sequence in the axial direction, and the positioning screw (32) can be respectively inserted into one of the positioning grooves (31) in the first commutation position, the idling position and the second commutation position.

9. A drive system having a drive device, characterized in that, the drive system further has a transmission device (100) according to any one of claims 1 to 8, and an input shaft (10) or an output shaft (20) of the transmission device (100) can be driven to rotate by the drive device.

10. A lift, characterized in that, the lift has the drive system according to claim 9, wherein the lift can be driven to rise or fall by the drive system.

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