Transmission component and jacking device with same

Abstract

The utility model relates to a transmission part and a jacking device with the transmission part, the jacking device comprises a rack, supporting legs and the transmission part, the supporting legs are provided with driving shafts extending in the horizontal direction, the rack is provided with the two supporting legs, and the transmission part comprises an input shaft, an output shaft and a position switching unit. The transmission part is of a clutch structure and can disconnect or establish the connection relation between the input shaft and the output shaft. Wherein the driving shaft of one supporting leg is connected with the output shaft through a coupler, and the other supporting leg is connected with the input shaft through a gear. The jacking device provides power for the two supporting legs through the transmission component, operation on the same side is achieved, and the supporting legs are independently driven to stretch out and draw back. And aiming at the outdoor bumpy ground, the function of asynchronous extension and retraction of the supporting legs is achieved, and the adaptive capacity of the jacking device is greatly improved.

Description

Technical Field

[0001] The utility model relates to a transmission component in the technical field of jacking and a jacking device comprising the transmission component. Background Art

[0002] When trailers and RVs are stationed for a long time, they need to obtain stable and reliable support through a dedicated lifting device. The lifting device is combined with the frame, and a leg is fixedly installed on each side of the frame. The driving shafts of the two legs are connected in series, and then the two legs are driven to telescopic motion by a handle on one side of the frame, or a transmission structure based on a bevel gear is set between the two legs to drive the legs at the same time from the middle position of the frame, thereby obtaining the required support height. For example, the Chinese patent with the invention name of the semi-trailer landing gear and the publication number CN1065832A published on November 4, 1992 records that the landing gear includes two retractable pillars, i.e., legs, which are connected in series by a connecting shaft, and a handle is located on one of the pillars and the handle is located on one side of the semi-trailer. When using, shake the handle to synchronize the two pillars. When the ground is uneven, the extension of the legs is not enough to make them touch the ground, and such a situation can only be solved by placing a pad under the suspended legs. Therefore, this type of lifting device in the prior art cannot obtain support on an uneven ground by relying on its own structure. Utility Model Content

[0003] The technical problem to be solved by the utility model is how to make the legs extend and retract asynchronously, thereby obtaining a transmission component and a lifting device with the transmission component.

[0004] In order to solve the above technical problems, the utility model provides a transmission component, which includes an input shaft, an output shaft, and a position switching unit. The position switching unit is provided with a pin hole, an assembly hole, a cylindrical chamber, an outer annular chamber, an inner annular chamber, and a connecting groove. The cylindrical chamber is connected to the assembly hole, and the center line of the cylindrical chamber coincides with the center line of the assembly hole. The pin hole is perpendicular to the assembly hole. The cylindrical chamber is located at one end of the assembly hole. The diameter of the cylindrical chamber is greater than the diameter of the assembly hole. The inner diameter of the outer annular chamber and the inner diameter of the inner annular chamber are both equal to the diameter of the cylindrical chamber. The outer annular chamber is located at the cylindrical chamber. The outer end of the chamber and the outer annular chamber are connected to the cylindrical chamber, the inner annular chamber is located at the inner end of the cylindrical chamber and the inner annular chamber is connected to the cylindrical chamber, the connecting groove is straight, one end of the connecting groove is connected to the outer annular chamber, the other end of the connecting groove is connected to the inner annular chamber, the side of the connecting groove is connected to the cylindrical chamber, the output shaft passes through the assembly hole, a limit pin is installed on the position switching unit, one end of the limit pin is inserted into the pin hole, a limit groove is provided on the output shaft, the limit groove is annular around the center line of the output shaft, the other end of the limit pin is embedded in the limit groove, the surface of the input shaft A limiting column is provided, a connecting hole and a receiving hole are provided inside the input shaft, the connecting hole and the receiving hole are communicated, the receiving hole is located at one end of the connecting hole, the center line of the connecting hole coincides with the center line of the receiving hole, the minimum width of the receiving hole is greater than the maximum width of the connecting hole, the cross section of the connecting hole is a regular hexagon, a connecting section is provided at one end of the output shaft, the cross section of the connecting section is a non-centrally symmetrical structure and the cross-sectional structure of the connecting section corresponds to the cross-sectional structure of the connecting hole, the connecting section of the output shaft extends into the interior of the input shaft, the end of the output shaft provided with the connecting section passes through the cylindrical chamber, the center line of the output shaft coincides with the cylindrical chamber The center line of the cylindrical chamber coincides with that of the input shaft, the end of the input shaft provided with the limiting post extends into the cylindrical chamber, the input shaft is movably connected to the position switching unit, the output shaft is movably connected to the input shaft, the movable range of the end of the input shaft provided with the limiting post intersects with the cylindrical chamber, the movable range of the limiting post is located in the outer annular chamber, the inner annular chamber, and the connecting groove, the input shaft is embedded in the connecting hole through the connecting section and moves synchronously with the output shaft in the circumferential direction around the center line of the output shaft, the input shaft is completely separated from the connecting hole through the connecting section and is located in the accommodating hole and moves asynchronously with the output shaft in the circumferential direction around the center line of the output shaft.

[0005] Although the input shaft and the output shaft in the transmission component are on the same center line, the input shaft and the output shaft can move synchronously relative to the same center line, that is, the output shaft rotates when the input shaft rotates, or they can move asynchronously relative to the same center line, that is, the output shaft does not rotate when the input shaft rotates. The transmission relationship between the input shaft and the output shaft can be separated and closed. In this way, a power output end can be provided on the input shaft, and a power output end can also be provided on the output shaft. Obviously, the two power output ends can operate synchronously or asynchronously. It is completely different from the structure in the prior art that the power transmission structure is a continuous and unified structure, as long as the power output ends based on the power transmission structure are all synchronously operated.

[0006] The cylindrical chamber, outer annular chamber, inner annular chamber, and connecting groove of the position switching unit can all be obtained on a whole piece or multiple pieces of metal material through existing processing conditions. When faced with the assembly process, it is necessary to consider the difficulty of assembly. To this end, the technical solution provides a position switching unit structure that is easy to process and easy to assemble. The position switching unit includes a mounting seat and an end cover. The end cover is fixedly mounted on the mounting seat by bolts, and the outer annular chamber is located between the mounting seat and the end cover. The mounting seat is obtained by processing a whole piece of metal, and the end cover is a plate-like structure. During assembly, the two can be assembled by fastening with bolts. In addition, the mounting seat is an open structure at the outer annular chamber, so the width of the outer annular chamber in a direction parallel to the center line of the cylindrical chamber is easier to control during manufacturing.

[0007] The position switching of the input shaft relative to the output shaft needs to meet the condition that the limit post is aligned with the connection groove. In order to increase the chance of the limit post aligning with the connection groove, the connection groove is distributed at equal angles around the center line of the cylindrical chamber. This helps to improve the smoothness of the clutch operation between the input shaft and the output shaft.

[0008] Benefiting from the asynchronous motion advantage of the input shaft and the output shaft of the above-mentioned transmission component, the utility model combines the transmission component with the legs in the prior art to achieve the purpose of independently driving the two legs to extend and retract on the same side. The lifting device includes a frame, a leg, and a transmission component. The leg is provided with a driving shaft extending in the horizontal direction. Two legs are installed on the frame. The transmission component includes an input shaft, an output shaft, and a position switching unit. The position switching unit is provided with a pin hole, an assembly hole, a cylindrical chamber, an outer annular chamber, an inner annular chamber, and a connecting groove. The cylindrical chamber is connected to the assembly hole. The center line of the cylindrical chamber coincides with the center line of the assembly hole. The pin hole is perpendicular to the assembly hole. The cylindrical chamber is located at one end of the assembly hole. The diameter of the cylindrical chamber is larger than the diameter of the assembly hole. The inner diameter of the outer annular chamber and the inner diameter of the inner annular chamber are both equal to the diameter of the cylindrical chamber. The outer annular chamber is located at the outer end of the cylindrical chamber and is communicated with the cylindrical chamber, the inner annular chamber is located at the inner end of the cylindrical chamber and is communicated with the cylindrical chamber, the connecting groove is straight, one end of the connecting groove is communicated with the outer annular chamber, the other end of the connecting groove is communicated with the inner annular chamber, the side of the connecting groove is communicated with the cylindrical chamber, the output shaft passes through the assembly hole, a limit pin is installed on the position switching unit, one end of the limit pin is inserted into the pin hole, a limit groove is provided on the output shaft, the limit groove is annular around the center line of the output shaft, the other end of the limit pin is embedded in the limit groove, and a limit column is provided on the surface of the input shaft. A connecting hole and a receiving hole are provided inside the input shaft, the connecting hole and the receiving hole are communicated, the receiving hole is located at one end of the connecting hole, the center line of the connecting hole coincides with the center line of the receiving hole, the minimum width of the receiving hole is greater than the maximum width of the connecting hole, the cross section of the connecting hole is a regular hexagon, a connecting section is provided at one end of the output shaft, the cross section of the connecting section is a non-centrally symmetrical structure and the cross-sectional structure of the connecting section corresponds to the cross-sectional structure of the connecting hole, the connecting section of the output shaft extends into the input shaft, the end of the output shaft provided with the connecting section passes through the cylindrical chamber, the center line of the output shaft coincides with the center line of the cylindrical chamber, the input shaft is provided with a limiting column The end extends into the cylindrical chamber, the input shaft is movably connected to the position switching unit, the output shaft is movably connected to the input shaft, the input shaft is provided with a limit column, the movable range of the end intersecting with the cylindrical chamber, the movable range of the limit column is located in the outer annular chamber, the inner annular chamber, and the connecting groove, a handle is installed on the input shaft, the handle is located outside the position switching unit, the position switching unit is installed on the frame through a bearing seat, the driving shaft of one leg is connected to the output shaft through a coupling, the driving shaft of the other leg is provided with a gear, the input shaft is also provided with a gear, the maximum distance between the two gears is less than the displacement of the input shaft along the center line of the output shaft,The gear on the leg is located within the movement range of the gear on the input shaft, the gear on the input shaft can mesh with the gear on the leg, the input shaft is embedded in the connecting hole through the connecting section and moves synchronously with the output shaft in the circumferential direction around the center line of the output shaft, and the input shaft drives one of the legs, the input shaft is completely separated from the connecting hole through the connecting section and is located in the receiving hole and moves asynchronously with the output shaft in the circumferential direction around the center line of the output shaft, and the input shaft drives the other leg.

[0009] In this technical solution, when the connecting section of the output shaft extends into the connecting hole of the input shaft, the rotation of the input shaft can drive the output shaft to rotate, and the gear on the input shaft is separated from the gear on the leg. Therefore, when the input shaft rotates, only one of the legs can be driven to extend and retract; when the connecting section of the output shaft is separated from the connecting hole of the input shaft, the rotation of the input shaft cannot drive the output shaft to rotate, and the gear on the input shaft is meshed with the gear on the leg. Therefore, when the input shaft rotates, only the other leg can be driven to extend and retract. In this way, it is possible to operate on the same side and independently drive the legs to extend and retract. For outdoor potholes, with the function of asynchronous extension and retraction of each leg, the adaptability of the jacking device is greatly improved.

[0010] The cylindrical chamber, outer annular chamber, inner annular chamber, and connecting groove of the position switching unit can all be obtained on a whole piece or multiple pieces of metal material through existing processing conditions. When faced with the assembly process, it is necessary to consider the difficulty of assembly. To this end, the technical solution provides a position switching unit structure that is easy to process and easy to assemble. The position switching unit includes a mounting seat and an end cover. The end cover is fixedly mounted on the mounting seat by bolts, and the outer annular chamber is located between the mounting seat and the end cover. The mounting seat is obtained by processing a whole piece of metal, and the end cover is a plate-like structure. During assembly, the two can be assembled by fastening with bolts. In addition, the mounting seat is an open structure at the outer annular chamber, so the width of the outer annular chamber in a direction parallel to the center line of the cylindrical chamber is easier to control during manufacturing.

[0011] The position switching of the input shaft relative to the output shaft needs to meet the condition that the limit post is aligned with the connection groove. In order to increase the chance of the limit post aligning with the connection groove, the connection groove is distributed at equal angles around the center line of the cylindrical chamber. This helps to improve the smoothness of the clutch operation between the input shaft and the output shaft.

[0012] The utility model adopts the above technical solution: the lifting device provides power to the two legs through the transmission component, realizing operation on the same side and independently driving the legs to extend and retract. For outdoor potholes, the legs have the function of asynchronous extension and retraction, and the adaptability of the lifting device is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention will be further described below in conjunction with the accompanying drawings and specific implementation methods.

[0014] Figure 1 This is a schematic diagram of the installation of the first embodiment of the utility model when the input shaft and the output shaft move synchronously;

[0015] Figure 2 for Figure 1 A partial enlarged view of

[0016] Figure 3 This is a schematic diagram of the installation of the first embodiment of the utility model when the input shaft and the output shaft move asynchronously;

[0017] Figure 4 for Figure 3 A partial enlarged view of

[0018] Figure 5 This is a schematic diagram of the output shaft structure of the first embodiment of the utility model;

[0019] Figure 6 This is a front view of the input shaft of the first embodiment of the utility model;

[0020] Figure 7 for Figure 6 A top view of

[0021] Figure 8 A three-dimensional diagram of the input shaft of the first embodiment of the utility model;

[0022] Fig. 9 The structure of the input shaft of the first embodiment of the utility model is shown in FIG. Figure Ⅰ ;

[0023] Fig.10 The structure of the input shaft of the first embodiment of the utility model is shown in FIG. Figure II ;

[0024] Fig.11 A three-dimensional diagram of a mounting base according to a first embodiment of the present utility model;

[0025] Fig.12 The structure of the position switching unit of the first embodiment of the utility model is shown in FIG. Figure Ⅰ ;

[0026] Fig.13 The structure of the position switching unit of the first embodiment of the utility model is shown in FIG. Figure II . DETAILED DESCRIPTION

[0027] like Figures 1 to 13 Shown is the first embodiment of the utility model.

[0028] The lifting device includes a frame, a leg 1, and a transmission component 2. The frame can be a structure independent of the vehicle frame, or the vehicle frame can be used as the frame. In this embodiment, the vehicle frame is used as the frame. The leg 1 is a prior art, and it has a drive shaft 3 extending in the horizontal direction, that is, the center line of the drive shaft 3 is in the horizontal plane, and the leg 1 can be extended and retracted to change its height in the vertical direction. Two legs 1 are installed on the frame, and the installation height of the legs 1 is the same. The center lines of the drive shafts 3 of the two legs 1 are parallel but not overlapped.

[0029] The transmission component 2 includes an input shaft 4, an output shaft 8, and a position switching unit 11. The position switching unit 11 includes a mounting seat 12 and an end cover 19. The output shaft 8 is connected to the drive shaft 3 of one of the legs 1 through a coupling; a gear 20 is provided on the drive shaft 3 of the other leg 1, and a gear 20 is installed on the input shaft 4. The input shaft 4 and the other leg 1 are meshed and connected through two gears 20, but when the two gears 20 are meshed, the input shaft 4 and the output shaft 8 are disconnected. Conversely, after the input shaft 4 and the output shaft 8 are connected, the two gears 20 are separated.

[0030] The outer cylindrical structure of the mounting seat 12. The mounting seat 12 is fixedly mounted on the frame through the bearing seat. The interior of the mounting seat 12 is hollow, and its interior specifically includes a pin hole 13, an assembly hole 14, a cylindrical chamber 15, an outer annular groove, an inner annular chamber 17, and a connecting groove 18. The end cover 19 is an annular structure, which is fixedly mounted on the mounting seat 12 by bolts. After installation, it directly covers the outer annular groove, so that the outer annular groove is surrounded by the mounting seat 12 and the end cover 19, thereby increasing the degree of closure, thereby forming an outer annular chamber 16. The outer annular chamber 16 is located between the mounting seat 12 and the end cover 19. In other words, the position switching unit 11 is provided with a pin hole 13, an assembly hole 14, a cylindrical chamber 15, an outer annular chamber 16, an inner annular chamber 17, and a connecting groove 18. On the center line of the position switching unit 11, the cylindrical chamber 15 and the assembly hole 14 are arranged one by one, and the center line of the position switching unit 11, the center line of the cylindrical chamber 15, and the center line of the assembly hole 14 coincide with each other; the center line of the cylindrical chamber 15 is perpendicular to the extension and retraction direction of the leg 1.

[0031] The diameter of the assembly hole 14 corresponds to the diameter of the output shaft 8, and there is a clearance fit between the assembly hole 14 and the output shaft 8. The diameter of the assembly hole 14 is smaller than the diameter of the cylindrical chamber 15, and the assembly hole 14 is in communication with the cylindrical chamber 15. The outer annular chamber 16 and the inner annular chamber 17 are both annular structures, and the inner diameters of the outer annular chamber 16 and the inner diameters of the inner annular chamber 17 are equal to the diameter of the cylindrical chamber 15. The outer annular chamber 16 is located at the outer end of the cylindrical chamber 15 and is communicated with the cylindrical chamber 15. The inner annular chamber 17 is located at the inner end of the cylindrical chamber 15 and is communicated with the cylindrical chamber 15. The connecting groove 18 is located on the side of the cylindrical chamber 15 and is straight. Two connecting grooves 18 symmetrically distributed relative to the center line of the cylindrical chamber 15 are provided inside the position switching unit 11. The two connecting grooves 18 are in the same horizontal direction and have the same width. One end of the connecting groove 18 is communicated with the outer annular chamber 16, and the other end of the connecting groove 18 is communicated with the inner annular chamber 17. The side of the connecting groove 18 is communicated with the cylindrical chamber 15. The width of the outer annular chamber 16 in a direction parallel to the center line of the position switching unit 11 is smaller than the width of the inner annular chamber 17 in a direction parallel to the center line of the position switching unit 11 .

[0032] The pin hole 13 is distributed at one end of the position switching unit, the pin hole 13 is connected to the assembly hole 14, the pin hole 13 is perpendicular to the assembly hole 14, and the pin holes 13 are distributed at equal angles around the center line of the assembly hole 14. The output shaft 8 passes through the assembly hole 14, and a limit groove 9 is provided on the output shaft 8, and the limit groove 9 is annular around the center line of the output shaft 8. A limit pin 21 is provided inside the mounting seat 12, one end of the limit pin 21 is inserted into the pin hole 13, and the other end of the limit pin 21 is embedded in the limit groove 9. In this way, the limit pin 21 is distributed at equal angles around the center line of the output shaft 8. The output shaft 8 is movably installed on the position switching unit 11 through the limit pin 21, and the output shaft 8 can rotate relative to the position switching unit 11. The center line of the output shaft 8 coincides with the center line of the position switching unit 11.

[0033] A connecting section 10 is provided at one end of the output shaft 8, and the cross section of the connecting section 10 is a non-centrosymmetric structure, such as a regular hexagon. The connecting section 10 of the output shaft 8 passes through the cylindrical chamber 15 of the position switching unit 11 and protrudes outside the position switching unit 11, and the center line of the output shaft 8 coincides with the center line of the cylindrical chamber 15.

[0034] The input shaft 4 is provided with a cavity structure inside, and the inside of the cavity includes a connecting hole 5 and a receiving hole 6. The connecting hole 5 and the receiving hole 6 are connected, and the center line of the connecting hole 5 coincides with the center line of the receiving hole 6. The receiving hole 6 is located at the inner end of the connecting hole 5. The cross section of the connecting hole 5 is a non-centrosymmetric structure, and the cross section structure of the connecting hole 5 corresponds to the cross section structure of the connecting section 10. Therefore, the cross section of the connecting hole 5 is also a regular hexagon.

[0035] The receiving hole 6 is a circular structure in cross section, and the minimum width of the receiving hole 6, i.e., the diameter of the receiving hole 6, is greater than the maximum width of the connecting hole 5. The input shaft 4 is cylindrical, and the surface of the input shaft 4 is provided with two limit posts 7 symmetrically distributed relative to the center line of the input shaft 4. A handle 22 is installed on the input shaft 4. The portion of the input shaft 4 provided with the limit posts 7 extends into the cylindrical chamber 15, and the input shaft 4 is movably connected to the position switching unit 11, and the input shaft 4 can rotate in the position switching unit 11.

[0036] After the input shaft 4 is installed, the connecting section 10 of the output shaft 8 extends into the interior of the input shaft 4, the output shaft 8 is movably connected to the input shaft 4, and the two limiting posts 7 are symmetrically distributed relative to the center line of the output shaft 8; the movable range of the limiting posts 7 is located in the outer annular chamber 16, the inner annular chamber 17, and the connecting groove 18, and the limiting posts 7 are embedded in the outer annular chamber 16 or the inner annular chamber 17 or the connecting groove 18 at any time. When the limiting posts 7 and the connecting groove 18 are in a misaligned state, the relative positional relationship between the input shaft 4 and the position switching unit 11 in the direction parallel to the center line of the output shaft 8 will not be changed.

[0037] Due to the limitation of the outer annular chamber 16 and the inner annular chamber 17, the part of the input shaft 4 provided with the limiting column 7 can only be inside the position switching unit 11, so the range of motion of the end of the input shaft 4 provided with the limiting column 7 intersects with the cylindrical chamber 15. In the initial state, the two gears 20 are in a separated state, the distance between the two gears 20 is kept at the maximum, the limiting column 7 is located in the outer annular chamber 16, the connecting section 10 is completely embedded in the connecting hole 5, the connecting section 10 of the output shaft 8 and the input shaft 4 are clearance-matched, and the cross-sections of the two are the same, so when the gripping handle 22 drives the input shaft 4 to rotate, the output shaft 8 must be driven to move; therefore, the input shaft 4 is embedded in the connecting hole 5 through the connecting section 10 and moves synchronously with the output shaft 8 in the circumferential direction around the center line of the output shaft 8, and at this time, the rotation of the input shaft 4 can directly drive the output shaft 8 to rotate, thereby driving one of the legs 1 to perform telescopic movement.

[0038] When in use, if the other leg 1 is driven, the angle of the limit column 7 is first adjusted to align the limit column 7 with the connecting groove 18, and then the input shaft 4 is pushed into the position switching unit 11 with force, and the limit column 7 passes through the connecting groove 18 and enters the inner annular chamber 17; the connecting section 10 is completely separated from the connecting hole 5, and the connecting section 10 is completely extended into the accommodating hole 6, and the connection relationship between the connecting section 10 of the output shaft 8 and the input shaft 4 is disconnected. At this time, even if the input shaft 4 is driven to move, the output shaft 8 cannot be driven to rotate by the input shaft 4, and the input shaft 4 and the output shaft 8 move independently of each other; the gear 20 on the input shaft 4 follows the input shaft 4 to move toward the position of the gear 20 on the drive shaft 3 until the two gears 20 are meshed with each other, and the displacement of the input shaft 4 along the center line of the output shaft 8 is greater than the maximum distance between the two gears 20. Therefore, the input shaft 4 is completely separated from the connection hole 5 through the connection section 10 and is located in the receiving hole 6 and moves asynchronously with the output shaft 8 in the circumferential direction around the center line of the output shaft 8. At this time, the rotation of the input shaft 4 directly drives the two gears 20 to rotate, and then the other leg 1 performs telescopic movement. The above two legs 1 are asynchronously telescoped, which is no longer the case of synchronous telescope of the legs 1 in the prior art.

[0039] The second embodiment of the utility model is different from the first embodiment in that the number of connecting grooves is increased and is an even number, and the connecting grooves are distributed at equal angles around the center line of the cylindrical chamber.

Claims

1. A transmission component, characterized in that: The transmission component comprises an input shaft (4), an output shaft (8), and a position switching unit (11); the position switching unit (11) is provided with a pin hole (13), an assembly hole (14), a cylindrical chamber (15), an outer annular chamber (16), an inner annular chamber (17), and a connecting groove (18); the cylindrical chamber (15) is connected to the assembly hole (14); the center line of the cylindrical chamber (15) coincides with the center line of the assembly hole (14); the pin hole (13) is perpendicular to the assembly hole (14); the cylindrical chamber (15) is located at one end of the assembly hole (14); the diameter of the cylindrical chamber (15) is greater than the diameter of the assembly hole (14); the inner diameter of the outer annular chamber (16) and the inner diameter of the inner annular chamber (17) are greater than the inner diameter of the outer annular chamber (16). 7) are equal to the diameter of the cylindrical chamber (15); the outer annular chamber (16) is located at the outer end of the cylindrical chamber (15) and the outer annular chamber (16) is connected to the cylindrical chamber (15); the inner annular chamber (17) is located at the inner end of the cylindrical chamber (15) and the inner annular chamber (17) is connected to the cylindrical chamber (15); the connecting groove (18) is straight; one end of the connecting groove (18) is connected to the outer annular chamber (16) and the other end of the connecting groove (18) is connected to the inner annular chamber (17); the side surface of the connecting groove (18) is connected to the cylindrical chamber (15); the output shaft (8) passes through the assembly hole (14); and a limit pin is installed on the position switching unit (11). (21), one end of the limit pin (21) is inserted into the pin hole (13), the output shaft (8) is provided with a limit groove (9), the limit groove (9) is annular around the center line of the output shaft (8), the other end of the limit pin (21) is embedded in the limit groove (9), the surface of the input shaft (4) is provided with a limit column (7), the input shaft (4) is provided with a connecting hole (5) and a receiving hole (6) inside, the connecting hole (5) and the receiving hole (6) are connected, the receiving hole (6) is located at one end of the connecting hole (5), the center line of the connecting hole (5) coincides with the center line of the receiving hole (6), the minimum width of the receiving hole (6) is greater than the maximum width of the connecting hole (5), and the cross section of the connecting hole (5) is A regular hexagon, one end of the output shaft (8) is provided with a connecting section (10), the cross section of the connecting section (10) is a non-centrosymmetric structure and the cross section structure of the connecting section (10) corresponds to the cross section structure of the connecting hole (5), the connecting section (10) of the output shaft (8) extends into the interior of the input shaft (4), the end of the output shaft (8) provided with the connecting section (10) passes through a cylindrical chamber (15), the center line of the output shaft (8) coincides with the center line of the cylindrical chamber (15), the end of the input shaft (4) provided with a limiting column (7) extends into the cylindrical chamber (15), the input shaft (4) is movably connected to a position switching unit (11), and the output shaft (8) is movably connected to the input shaft (4),The movable range of the end of the input shaft (4) provided with a limiting column (7) intersects with the cylindrical chamber (15), and the movable range of the limiting column (7) is located in the outer annular chamber (16), the inner annular chamber (17), and the connecting groove (18). The input shaft (4) is embedded in the connecting hole (5) through the connecting section (10) and moves synchronously with the output shaft (8) in the circumferential direction around the center line of the output shaft (8). The input shaft (4) is completely separated from the connecting hole (5) through the connecting section (10) and is located in the receiving hole (6) and moves asynchronously with the output shaft (8) in the circumferential direction around the center line of the output shaft (8).

2. The transmission component (2) according to claim 1, characterized in that: The position switching unit (11) comprises a mounting seat (12) and an end cover (19); the end cover (19) is fixedly mounted on the mounting seat (12) by means of bolts; and the outer annular chamber (16) is located between the mounting seat (12) and the end cover (19).

3. The transmission component (2) according to claim 1, characterized in that: The connecting grooves (18) are distributed at equal angles around the center line of the cylindrical chamber (15).

4. A lifting device, characterized in that: The lifting device comprises a frame, a support leg (1), and a transmission component (2); the support leg (1) is provided with a drive shaft (3) extending in the horizontal direction; two support legs (1) are mounted on the frame; the transmission component (2) comprises an input shaft (4), an output shaft (8), and a position switching unit (11); the position switching unit (11) is provided with a pin hole (13), an assembly hole (14), a cylindrical chamber (15), an outer annular chamber (16), an inner annular chamber (17), and a connecting groove (18); the cylindrical chamber (15) is connected to the assembly hole (14); the center line of the cylindrical chamber (15) coincides with the center line of the assembly hole (14); the pin hole (13) is perpendicular to the assembly hole (14); the cylindrical chamber (15) Located at one end of the assembly hole (14), the diameter of the cylindrical chamber (15) is greater than the diameter of the assembly hole (14), the inner diameter of the outer annular chamber (16) and the inner diameter of the inner annular chamber (17) are both equal to the diameter of the cylindrical chamber (15), the outer annular chamber (16) is located at the outer end of the cylindrical chamber (15) and the outer annular chamber (16) is connected to the cylindrical chamber (15), the inner annular chamber (17) is located at the inner end of the cylindrical chamber (15) and the inner annular chamber (17) is connected to the cylindrical chamber (15), the connecting groove (18) is straight, one end of the connecting groove (18) is connected to the outer annular chamber (16), and the other end of the connecting groove (18) is connected to the inner annular chamber (17), and the connecting groove ( The side of the input shaft (4) is connected to the cylindrical chamber (15), the output shaft (8) passes through the assembly hole (14), a limit pin (21) is installed on the position switching unit (11), one end of the limit pin (21) is inserted into the pin hole (13), a limit groove (9) is provided on the output shaft (8), the limit groove (9) is annular around the center line of the output shaft (8), the other end of the limit pin (21) is embedded in the limit groove (9), a limit column (7) is provided on the surface of the input shaft (4), a connecting hole (5) and a receiving hole (6) are provided inside the input shaft (4), the connecting hole (5) and the receiving hole (6) are connected, the receiving hole (6) is located at one end of the connecting hole (5), and the center line of the connecting hole (5) is aligned with the receiving hole (6). The center line of the receiving hole (6) coincides with the center line of the connecting hole (5), the minimum width of the accommodating hole (6) is greater than the maximum width of the connecting hole (5), the cross section of the connecting hole (5) is a regular hexagon, one end of the output shaft (8) is provided with a connecting section (10), the cross section of the connecting section (10) is a non-centrally symmetrical structure and the cross section structure of the connecting section (10) corresponds to the cross section structure of the connecting hole (5), the connecting section (10) of the output shaft (8) extends into the interior of the input shaft (4), the end of the output shaft (8) provided with the connecting section (10) passes through the cylindrical chamber (15), the center line of the output shaft (8) coincides with the center line of the cylindrical chamber (15), the end of the input shaft (4) provided with the limiting column (7) extends into the cylindrical chamber (15),The input shaft (4) is movably connected to the position switching unit (11), and the output shaft (8) is movably connected to the input shaft (4). The input shaft (4) is provided with a limit column (7), and the movable range of the end of the limit column (7) intersects with the cylindrical chamber (15). The movable range of the limit column (7) is located in the outer annular chamber (16), the inner annular chamber (17), and the connecting groove (18). A handle (22) is installed on the input shaft (4), and the handle (22) is located outside the position switching unit (11). The position switching unit (11) is installed on the frame through a bearing seat. The driving shaft (3) of one leg (1) is connected to the output shaft (8) through a coupling. The driving shaft (3) of the other leg (1) is provided with a gear (20). The input shaft (4) is also provided with a gear (20). The two gears (2 0) is less than the displacement of the input shaft (4) along the center line of the output shaft (8), the gear (20) on the leg (1) is located within the movement range of the gear (20) on the input shaft (4), the gear (20) on the input shaft (4) can mesh with the gear (20) on the leg (1), the input shaft (4) is embedded in the connecting hole (5) through the connecting section (10) and moves synchronously with the output shaft (8) in the circumferential direction around the center line of the output shaft (8), and the input shaft (4) drives one of the legs (1), the input shaft (4) is completely separated from the connecting hole (5) through the connecting section (10) and is located in the receiving hole (6) and moves asynchronously with the output shaft (8) in the circumferential direction around the center line of the output shaft (8), and the input shaft (4) drives the other leg (1).

5. The lifting device according to claim 4, characterized in that: The position switching unit (11) comprises a mounting seat (12) and an end cover (19); the end cover (19) is fixedly mounted on the mounting seat (12) by means of bolts; and the outer annular chamber (16) is located between the mounting seat (12) and the end cover (19).

6. The lifting device according to claim 4, characterized in that: The connecting grooves (18) are distributed at equal angles around the center line of the cylindrical chamber (15).

Images