Planetary gear speed reducer

Abstract

The invention discloses a planetary gear reducer, and belongs to the technical field of gear reducers. Comprising a shell, a first gear, a planetary gear set and an output shaft, the shell is of a hollow structure to form a transmission space, the first gear is arranged in the transmission space, the planetary gear set is arranged in the transmission space and provided with an input end and an output end, and the input end is in power connection with the first gear. One end of the output shaft is located in the transmission space and is in power connection with the output end of the planetary gear set, and the other end of the output shaft extends out of the shell. When the movable shaft needs to be recycled, the bolt fastener between the end cover and the connecting shaft is detached, the end cover and the connecting shaft are separated, then the locking bolt is screwed in to enable the movable shaft and the limiting block to be disconnected, the movable shaft can be pushed to move into the recycling cavity, and recycling of the movable shaft is completed.

Description

Technical Field

[0001] The invention relates to a planetary gear reduction device, belonging to the technical field of gear reduction boxes. Background Art

[0002] Planetary gear reducers use a gear speed converter to reduce the speed of a motor to the required number of revolutions. This is achieved by meshing a smaller gear on the drive shaft with a larger gear on the output shaft. The ratio of the number of teeth between the smaller and larger gears is the transmission ratio. This reduction effect makes planetary gear reducers suitable for mechanical transmissions requiring low speed and high torque.

[0003] If a traditional planetary gear reducer needs to achieve two-stage deceleration, it is necessary to add another set of gear pairs for deceleration to form a new input end. However, since the input end of the secondary deceleration is located on the same side as the input end of the primary deceleration, if the distance between the two input ends is close, when the driving element is installed at the input end of the secondary deceleration, the input end of the deceleration is likely to interfere with the driving element, making it difficult to determine the position and external structure of the driving element, so there are certain problems. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a planetary gear reduction device, which solves the problem in the prior art that when a driving element is installed on the input end of the secondary reduction, the input end of the reduction will interfere with the installation of the driving element, making the selection of the driving element and the installation position difficult to determine.

[0005] The technical problem to be solved by the present invention is achieved by adopting the following technical solution: A planetary gear reduction device, comprising: The shell has a hollow structure inside which forms a transmission space. The first gear is arranged in the transmission space, The planetary gear set is arranged in the transmission space. The planetary gear set is provided with an input end and an output end, wherein the input end is connected to the first gear power. The output shaft has one end located in the transmission space and is connected to the output end of the planetary gear set, and the other end of the output shaft extends to the outside of the housing. The connecting shaft is rotatably arranged in the transmission space, and is power-connected to the end of the first gear away from the planetary gear set. A recovery chamber is provided in the connecting shaft. The movable shaft is inserted into the connecting shaft through the end of the connecting shaft away from the first gear. A keyway is provided along the axial direction of the connecting shaft at the connection between the connecting shaft and the movable shaft. The limiting structure is set between the connecting shaft and the movable shaft to limit the axial movement of the movable shaft. An input shaft, one end of which is located in the transmission space and meshes with the first gear, and the other end of which extends to the outside of the housing. Among them, the movable shaft, connecting shaft, first gear and output shaft are coaxially arranged, one end of the keyway is connected to the recovery cavity, the other end of the keyway passes through the connecting shaft, the end of the movable shaft is inserted into the connecting shaft and extends into the keyway to form a keyway fit, and the part of the movable shaft extending to the keyway can be moved into the recovery cavity to disengage the keyway fit from the connecting shaft.

[0006] By adopting the above technical solution, when the reduction gear is in normal use, the movable shaft is dynamically connected to the external drive element. The drive element inputs power through the movable shaft, which is decelerated by the first gear and the planetary gear set and then output through the output shaft, thereby achieving the purpose of reducing the speed and increasing the torque. When the input shaft is needed for power input, the external drive element is dynamically connected to the input shaft. The drive element inputs power through the input shaft. The input shaft first undergoes a first deceleration by meshing with the first gear, and then undergoes a second deceleration by the planetary gear set. This enables the reduction gear to perform both primary and secondary deceleration, thereby improving the applicability of the reduction gear. When the input shaft is used, the movable shaft may partially interfere with the installation of the drive element dynamically connected to the input shaft, resulting in an inability to properly install the drive element. In this case, by unlocking the limiting structure, the movable shaft can slide axially along the first gear, and move through the end of the movable shaft extending into the keyway into the recovery cavity, so that the end of the movable shaft located outside the housing is recovered into the interior of the connecting shaft. At this time, the portion of the movable shaft extending outside the housing is shortened, thereby minimizing interference with the installation of the drive element, facilitating the selection and installation of the drive element, and improving the convenience of installing the drive element.

[0007] The present invention is further configured as follows: the limiting structure includes: The end cover is detachably fixed on the end surface of the connecting shaft away from the first gear. The limit block is located in the keyway, one end of the limit block is fixed to the end cover, and the other end of the limit block abuts against the part of the movable shaft extending into the keyway. The locking bolt passes through the limit block and the part of the movable shaft located in the keyway along the axial direction of the movable shaft, and the locking bolt is threadedly connected to the limit block and the movable shaft respectively.

[0008] By adopting the above technical solution, when installing the movable shaft, first insert the movable shaft into the connecting shaft, and make the part of the movable shaft extending to the keyway slide and insert it into the keyway, then align one side of the end cover with the limit block and the keyway, and insert the limit block into the keyway, while the end cover and the connecting shaft are in contact, first fix the end cover and the connecting shaft with the bolt fasteners, and then adjust the axial position of the movable shaft so that the limit block and the part of the movable shaft extending into the keyway are in contact, and then screw the locking bolt into the limit block and the end cover respectively to fix the two. At this time, the movable shaft will not be able to slide axially. At this time, the movable shaft can drive the connecting shaft to rotate through the part extending to the keyway, thereby driving the first gear to rotate for power transmission. When the movable shaft needs to be recovered, the bolt fasteners between the end cover and the connecting shaft are removed to complete the separation of the end cover and the connecting shaft, and then the locking bolt is screwed in to disconnect the movable shaft from the limit block, which can push the movable shaft to move in the recovery cavity, completing the recovery of the movable shaft.

[0009] The present invention is further configured as follows: the planetary gear set includes: The planetary carrier is rotatably arranged in the transmission space, and the output shaft is coaxially fixedly connected to the planetary carrier The intermediate shaft has one end coaxially connected to the first gear and the other end extending into the planet carrier. The sun gear is coaxially fixed on one end of the intermediate shaft located in the planetary carrier. The planetary gears are rotatably mounted on the planetary carrier and are located on the radial side of the sun gear. The planetary gears mesh with the sun gear. The ring gear is fixedly arranged in the transmission space, and the ring gear is arranged around the outside of the planet carrier, and the planetary gears are meshed with the inner side of the ring gear.

[0010] By adopting the above technical solution, the rotation of the first gear drives the intermediate shaft to rotate, thereby driving the sun gear to rotate. Since the planetary gears are engaged with the sun gear, the planetary gears orbit around the ring gear and rotate themselves, thereby causing the planetary gears to drive the planetary carrier to rotate, and then drive the output shaft to rotate, achieving the purpose of deceleration.

[0011] The present invention is further configured as follows: the housing comprises: First flange, The gear box is fixedly mounted against the first flange. The second flange is fixedly connected to the end of the gearbox away from the first flange. The supporting structure is fixedly arranged on the gear box to support the gear box.

[0012] The present invention is further configured as follows: the support structure includes: The bottom plate is provided on the radial side of the gearbox. The support plate has one end fixed to the outer surface of the gear box and the other end fixed to the bottom plate. Several support plates are provided along the circumference of the gear box. The reinforcing plate is fixed between adjacent supporting plates. Among them, an installation space is opened at the connection between the support plate and the gear box.

[0013] By adopting the above technical solution, the first flange is fixed to the gear box through bolt fasteners after being abutted against it, and the second flange is fixed to the gear box through bolt fasteners after being abutted against it. At this time, a transmission space is formed inside the first flange, the gear box and the second flange. The support plate and the reinforcement plate support the outer shell and are connected to the bottom plate so that the reduction gear can be placed normally on a plane.

[0014] The present invention is further configured as follows: an outer mounting ring is inserted into the installation space, the outer mounting ring is arranged around the abutment of the first flange and the gear box, an abutment block is fixed on the outside of the outer mounting ring, the abutment block extends between adjacent support plates and is fixed to the reinforcing plate by a connecting piece, an intermediate airbag is provided in the outer mounting ring, a second flange is opened in the circumferential direction on the abutment surface of the gear box and the first flange, the second flange is provided with an expansion sealing ring, the expansion sealing ring is filled with gas, the expansion sealing ring and the intermediate airbag are connected by several connecting pipes, several air guide channels connected to the intermediate airbag are opened in the outer mounting ring, elastic sheets arranged to abut against each other are fixed in the air guide channels, the elastic sheets close the air guide channels after abutment, an inflation cavity is opened on the end face of the outer mounting ring away from the gear box, the inflation cavity is connected to the air guide channel, and an inflation structure for replenishing gas into the intermediate airbag is provided in the inflation cavity.

[0015] The present invention is further configured as follows: the inflatable structure comprises: The inflatable airbag is detachably arranged in the inflatable cavity. The inflation tube is fixedly arranged at one end of the inflatable airbag facing the air guide channel, and the end of the inflation tube extends into the air guide channel. The end of the inflation tube extends to the air guide channel and is sealed with the inner wall of the air guide channel. A disposable sealing sheet is fixedly arranged inside the inflation tube, and the disposable sealing sheet seals the inflatable airbag. The threaded tightening block is arranged on the side of the inflatable airbag away from the air guide channel, and the threaded tightening block is threadedly connected to the inner wall of the inflatable cavity. The handle is fixed on the side of the threaded tightening block away from the air guide channel, and the end of the handle extends to the outside of the outer mounting ring. The reset part is arranged at the connection point between the inside of the inflation cavity and the air guide channel, and is used to push the inflated airbag to move in a direction away from the air guide channel.

[0016] The present invention is further configured as follows: the reset unit includes: The sliding plate is axially slidable along the outer mounting ring and arranged in the inflation cavity. The sliding plate abuts against the inflatable airbag, and the inflation tube passes through the sliding plate. The elastic member is arranged between the sliding plate and the end wall of the inflation cavity facing the air guide channel.

[0017] By adopting the above technical solution, when installing the first flange and the gearbox, the outer mounting ring is installed first, and the expansion sealing ring is placed in the second flange. At this time, the connecting pipe extends to the outside of the gearbox through the second flange, and the outer mounting ring is also located outside the gearbox. Then the first flange is inserted through the middle of the outer mounting ring and abuts against the gearbox. At this time, the expansion sealing ring is completely located in the second flange, and the abutment block is located in the adjacent support plate. Then the reinforcement plate and the abutment block are fixed by the connecting piece. At this time, the outer mounting ring cannot move. Since the expansion sealing ring is filled with gas, the expansion sealing ring abuts and squeezes the inner wall of the second flange after expansion, thereby sealing the connection between the gearbox and the first flange. During the sealing process, the elastic sheet closes the air guide channel to prevent the gas in the intermediate airbag and the expansion sealing ring from escaping. After the deceleration device has been used for a long time, the gas in the expansion sealing ring will escape. At this time, the air pressure in the expansion sealing ring will decrease, resulting in a decrease in the abutment pressure with the inner wall of the second flange, which reduces its sealing effect. At this time, an inflatable airbag is placed in the inflation cavity, and the inflation tube is inserted into the air guide channel after passing through the sliding plate to seal the air guide channel. Then, the threaded tightening block is screwed into the inflation cavity, and the threaded tightening block is rotated by grasping the handle. Under the action of the threaded structure, the inflatable airbag is pushed to move in the direction of the air guide channel. In the process of the inflatable airbag moving toward the air guide channel, the sliding plate is pushed to squeeze the elastic part. When the end of the inflation tube is fully inserted and abuts against the two opposite elastic sheets, the abutting ends of the two elastic sheets are supported outwards to disengage the abutment, and then the thread is tightened. Further pressing of the tightening block causes the inflatable airbag to deform and the air pressure in the inflatable airbag to increase. When the air pressure difference on both sides of the disposable sealing piece reaches the rupture value of the disposable sealing piece, the disposable sealing piece expands and ruptures, and the gas in the inflatable airbag is discharged through the inflation tube. At this time, the gas in the inflatable airbag is introduced into the air guide channel through the inflation tube and enters the intermediate airbag through the air guide channel. The air pressure in the expansion sealing ring, the intermediate airbag and the inflatable airbag remains the same and meets the sealing requirements of the expansion sealing ring. At this time, the rotation of the threaded tightening block is stopped, and then when the air pressure in the expansion sealing ring is further reduced, the threaded tightening block is continued to be rotated so that the threaded tightening block further squeezes the inflatable airbag, so that the air pressure in the expansion sealing ring always remains stable and meets the sealing requirements. When the threaded tightening block completely squeezes and deforms the inflatable airbag, so that the gas in the inflatable airbag is fully squeezed out, the inflatable airbag needs to be replaced. At this time, the threaded tightening block is rotated in the opposite direction. The threaded tightening block releases the pressure on the inflatable airbag, and the sliding plate pushes the inflatable airbag to return to its original position and slide under the elastic action of the elastic part. When the threaded tightening block is completely unscrewed from the inflation cavity, the inflatable airbag can be pulled out. In this process, after the end of the inflation tube disengages from the abutment with the elastic sheet, the relatively arranged elastic sheet re-abuts to seal the air guide channel, so that the gas in the middle airbag and the expansion sealing ring cannot be discharged, thereby achieving the purpose of retaining the gas in the expansion sealing ring.After the inflatable airbag is pulled out of the inflation chamber, a new one is replaced, the inflation tube is reinserted into the air guide channel, and the threaded tightening block is screwed in to re-compress the inflatable airbag. No external air pump is required; a replaceable inflatable airbag is used for inflation. While the airbag is still full, the air pressure in the expansion seal ring can be maintained by rotating the threaded tightening block. When the inflatable airbag is exhausted, removal and replacement are simple, eliminating the need to disassemble the first flange and gearbox, improving the maintenance efficiency of the reduction gear unit.

[0018] The beneficial effects of the present invention are as follows: when the reduction gear is in normal use, the movable shaft is power-connected to the external drive element, the drive element inputs power through the movable shaft, and outputs it through the output shaft after deceleration by the first gear and the planetary gear set, thereby achieving the purpose of reducing the speed and increasing the torque; when the input shaft needs to be used for power input, the external drive element is power-connected to the input shaft, the drive element inputs power through the input shaft, and the input shaft first performs the first deceleration by meshing with the first gear, and then performs the second deceleration by the planetary gear set, so that the reduction gear can perform both primary deceleration and secondary deceleration, thereby improving the applicable scenarios of the reduction gear.

[0019] When the input shaft is in use, the movable shaft may partially interfere with the installation of the driving element connected to the input shaft power, resulting in the driving element being unable to be installed normally. At this time, by unlocking the limiting structure, the movable shaft can slide along the axis of the first gear, and the end of the movable shaft extending into the keyway moves into the recovery cavity, so that the end of the movable shaft located outside the outer shell is recovered to the inside of the connecting shaft. At this time, the part of the movable shaft extending to the outside of the outer shell becomes shorter, which can avoid interference with the installation of the driving element to the greatest extent, facilitate the selection and installation of the driving element, and help to improve the installation convenience of the driving element. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a cross-sectional view of the structure of the present invention; Figure 3 for Figure 2 A magnified view of the structure at point A; Figure 4 for Figure 2 A magnified view of the structure at B in the middle; Figure 5 This is a schematic structural diagram of the outer mounting ring in the present invention; Figure 6 This is a schematic diagram of the structure when the movable shaft is retracted into the connecting shaft in the present invention.

[0021] In the figure: 10. Base plate; 11. Support plate; 12. Reinforcement plate; 13. First flange; 14. Gearbox; 15. Second flange; 16. Output shaft; 17. Input shaft; 18. First gear; 19. Intermediate shaft; 20. Sun gear; 21. Planetary gear; 22. Ring gear; 23. Planet carrier; 24. Connecting shaft; 25. Movable shaft; 26. Recovery chamber; 27. Keyway; 28. End cover; 29. Limit block; 30. Locking bolt; 31. Outer mounting ring; 32. Abutment block; 33. Expansion sealing ring; 34. Connecting pipe; 35. Intermediate airbag; 36. Air guide channel; 37. Elastic sheet; 38. Inflating chamber; 39. Sliding plate; 40. Inflatable airbag; 41. Inflating pipe; 42. Elastic member; 43. Threaded tightening block; 44. Handle; 45. Installation space; 46. Transmission space; 47. Disposable sealing sheet. DETAILED DESCRIPTION

[0022] In order to make the technical means, creative features, objectives and effects of the present invention easier to understand, the present invention is further explained below with reference to specific illustrations.

[0023] like Figure 1 and Figure 2 As shown, a planetary gear reduction device includes a housing, which includes a first flange 13 with a hollow interior, a gearbox 14 abutting and fixed to the first flange 13, a second flange 15 abutting and fixed to an end of the gearbox 14 remote from the first flange 13, and a support structure. The support structure is fixedly mounted on the gearbox 14 to support the gearbox 14. The first flange 13, the gearbox 14, and the second flange 15 are fixed together by bolt fasteners. When assembled, the internal space forms a transmission space 46. Sealing rings are provided between the first flange 13 and the gearbox 14, and between the gearbox 14 and the second flange 15 for sealing.

[0024] like Figure 2As shown, a first gear 18 and a planetary gear set are disposed within the transmission space 46. The first gear 18 is rotatably connected to the first flange 13. The planetary gear set has an input and an output, with the input being power-connected to the first gear 18. An output shaft 16 is also disposed within the transmission space 46. One end of the output shaft 16 is located within the transmission space 46 and is power-connected to the output end of the planetary gear set. The other end of the output shaft 16 extends to the exterior of the housing through the second flange 15. The end of the first gear 18 facing away from the planetary gear set is power-connected to a connecting shaft 24. The connection between the connecting shaft 24 and the first gear 18 may include, but is not limited to, a spline connection, a keyway connection, or the like. Furthermore, the first gear 18 and the connecting shaft 24 can be directly integrated during manufacturing without requiring separation. The connecting shaft 24 is rotatably disposed within the transmission space 46. A recovery chamber 26 is disposed within the connecting shaft 24. The recovery chamber 26 has an insertion opening disposed toward the end facing away from the first gear 18. The opening is smaller than the internal dimensions of the recovery chamber 26. A movable shaft 25 is inserted into the insertion port, and a keyway 27 is provided at the connection between the connecting shaft 24 and the movable shaft 25, that is, the radial side of the insertion port, along the axial direction of the connecting shaft 24. One end of the keyway 27 is communicated with the recovery chamber 26, and the other end of the keyway 27 passes through the connecting shaft 24. The movable shaft 25 is inserted into the end of the connecting shaft 24 and extends into the keyway 27 to form a keyway fit. When the part of the movable shaft 25 extending to the keyway 27 moves into the recovery chamber 26, the movable shaft 25 is disengaged from the keyway fit with the connecting shaft 24, and the movable shaft 25, the connecting shaft 24, the first gear 18 and the output shaft 16 are coaxially arranged.

[0025] like Figure 2 and Figure 4 As shown, a limiting structure for limiting the axial movement of the movable shaft 25 is provided between the connecting shaft 24 and the movable shaft 25, and the radial side of the first gear 18 is engaged with an input shaft 17 whose end is located in the transmission space 46, and the other end of the input shaft 17 extends to the outside of the housing.

[0026] like Figure 4 As shown, the limiting structure includes an end cover 28, a limiting block 29, and a locking bolt 30. The end cover 28 is detachably fixedly disposed on the end surface of the connecting shaft 24 away from the first gear 18. The detachable fixing structure is fixed using bolt fasteners. The limiting block 29 is located in the keyway 27. One end of the limiting block 29 is fixed to the end cover 28, and the other end of the limiting block 29 abuts against the portion of the movable shaft 25 that extends into the keyway 27. The locking bolt 30 axially penetrates the limiting block 29 and the portion of the movable shaft 25 located in the keyway 27, respectively. The locking bolt 30 is threadedly connected to the limiting block 29 and the movable shaft 25, respectively. After the locking bolt 30 penetrates the limiting block 29 and the movable shaft 25, two threaded holes are formed on the limiting block 29 and the movable shaft 25, and the internal threads match after alignment.

[0027] like Figure 2As shown, the planetary gear set includes an intermediate shaft 19, a sun gear 20, planetary gears 21, a ring gear 22, and a planetary carrier 23. The planetary carrier 23 is rotatably mounted within a transmission space 46, and the output shaft 16 is coaxially and fixedly connected to the planetary carrier 23. One end of the intermediate shaft 19 is coaxially connected to the first gear 18, and the other end of the intermediate shaft 19 extends into the planetary carrier 23. The sun gear 20 is coaxially and fixedly mounted on the intermediate shaft 19 end within the planetary carrier 23. The intermediate shaft 19 and the first gear 18 are connected using a spline or keyway connection, or they can be directly machined as an integral structure depending on actual needs. The planetary gears 21 are rotatably mounted within the planetary carrier 23 and are located radially to the sun gear 20. They mesh with each other, and their rotational path extends radially to the outside of the planetary carrier 23. The ring gear 22 is fixedly mounted within the transmission space 46, surrounding the outside of the planetary carrier 23, and meshing with the inside of the ring gear 22. Three planetary gears 21 are arranged at equal angles along the circumference of the planetary carrier 23 .

[0028] like Figure 1 and Figure 6 As shown, the support structure includes a base plate 10, a support plate 11, and a reinforcement plate 12. The base plate 10 is positioned radially on the gearbox 14 and can be placed on a mounting surface. One end of the support plate 11 is fixed to the outer surface of the gearbox 14, and the other end is fixed to the base plate 10. Several support plates 11 are provided along the circumference of the gearbox 14. The reinforcement plates 12 are fixed between adjacent support plates 11 to provide reinforcement. A mounting space 45 is defined at the connection between the support plates 11 and the gearbox 14.

[0029] like Figure 1 、 Figure 3 and Figure 5As shown, an outer mounting ring 31 is inserted into the installation space 45 and arranged around the junction of the first flange 13 and the gearbox 14. An abutment block 32 is fixed to the outside of the outer mounting ring 31. The abutment block 32 extends between adjacent support plates 11 and is secured to the reinforcement plate 12 via connectors, which may include but are not limited to bolts, screws, etc. Alternatively, the support plates 11 and reinforcement plates 12 may be directly welded to each other. An abutment block 32 extending axially along the output shaft 16 is provided at the junction of the outer mounting ring 31 and the support plate 11. The abutment block 32 abuts the support plate 11 to prevent circumferential rotation of the outer mounting ring 31 during installation. An intermediate airbag 35 is disposed within the outer mounting ring 31. The intermediate airbag 35 is an annular structure that surrounds the first flange 13. The abutting surfaces of the gearbox 14 and the first flange 13 are each circumferentially formed with a second flange 15. When the gearbox 14 and the first flange 13 are abutted, the two second flanges 15 align and combine to form a complete second flange 15. An expandable sealing ring 33 is located within the second flange 15 and is filled with gas. Several connecting tubes 34 connect the expandable sealing ring 33 and the intermediate airbag 35. Several air channels 36 are defined within the outer mounting ring 31, connecting to the intermediate airbag 35. These channels are secured with elastic tabs 37, which are positioned in abutting relationship with each other. The opposite ends of the elastic tabs 37 abut each other, and the abutting ends of the tabs 37 bend toward the intermediate airbag 35. Upon abutment, the tabs 37 seal the channels 36. The elastic tabs 37 are only able to continue to bend toward the intermediate airbag 35. An inflation chamber 38 is defined on the end of the outer mounting ring 31 facing away from the gearbox 14. This cavity 38 surrounds the first flange 13 and connects to the several air channels 36. An inflation structure for replenishing gas into the intermediate airbag 35 is provided in the inflation chamber 38 .

[0030] like Figure 3As shown, the inflation structure includes an inflatable airbag 40, an inflatable tube 41, a threaded tightening block 43, a handle 44, and a reset portion. The inflatable airbag 40 is detachably mounted in the inflation chamber 38, and the inflatable airbag 40 is filled with gas. The inflatable tube 41 is fixedly mounted at one end of the inflatable airbag 40 facing the air guide channel 36. The end of the inflatable tube 41 extends into the air guide channel 36 and is sealed against the inner wall of the air guide channel 36. The end of the inflatable tube 41 extending into the air guide channel 36 is in a convergent shape. The inflatable tube 41 is connected to the inflatable airbag 40. A disposable sealing sheet 47 is fixedly mounted inside the inflatable tube 41 to seal the inflatable airbag 40. The disposable sealing sheet 47 is damaged when subjected to a certain amount of unidirectional pressure. When the inflatable airbag 40 is in a normal, uncompressed state, the pressure difference between the air pressure in the inflatable airbag 40 and the atmospheric pressure cannot damage the disposable sealing sheet 47. A threaded tightening block 43 is located on the side of the inflatable airbag 40 away from the air channel 36. The outer surface of the threaded tightening block 43 is threadedly connected to the inner wall of the inflation chamber 38. A handle 44 is fixed to the side of the threaded tightening block 43 away from the air channel 36. The end of the handle 44 extends outside the outer mounting ring 31. A reset member is located at the connection between the interior of the inflation chamber 38 and the air channel 36. The reset member is used to propel the inflatable airbag 40 away from the air channel 36.

[0031] like Figure 3 As shown, the reset portion includes a sliding plate 39 and an elastic member 42. The sliding plate 39 slides axially along the outer mounting ring 31 within the inflation cavity 38. The sliding plate 39 abuts against the inflatable airbag 40, and the inflation tube 41 passes through the sliding plate 39. The elastic member 42 is disposed between the sliding plate 39 and the end wall of the inflation cavity 38 facing the air guide channel 36. The elastic member 42 includes but is not limited to a spring rod, a spring, and an elastic compression block.

[0032] When the reduction gear is in normal use, the movable shaft 25 is connected to the external drive element, and the drive element inputs power through the movable shaft 25, and outputs it through the output shaft 16 after deceleration by the first gear 18 and the planetary gear set, so as to achieve the purpose of reducing the speed and increasing the torque. When the input shaft 17 is needed for power input, the external drive element is connected to the input shaft 17, and the drive element inputs power through the input shaft 17. The input shaft 17 first performs the first deceleration by meshing with the first gear 18, and then performs the second deceleration by the planetary gear set, so that the reduction gear can perform both primary deceleration and secondary deceleration, thereby improving the reduction efficiency. The applicable scenarios of the speed device, and when the input shaft 17 is used, the movable shaft 25 may partially interfere with the installation of the driving element that is power-connected to the input shaft 17, resulting in the driving element being unable to be installed normally. At this time, by unlocking the limit structure, the movable shaft 25 can slide axially along the first gear 18, and the end of the movable shaft 25 extending into the keyway 27 moves into the recovery chamber 26, so that the end of the movable shaft 25 located outside the shell is recovered to the inside of the connecting shaft 24. At this time, the part of the movable shaft 25 extending to the outside of the shell becomes shorter, which can avoid interference with the installation of the driving element to the greatest extent, which is conducive to improving the installation convenience of the driving element.

[0033] When installing the movable shaft 25, first insert the movable shaft 25 into the connecting shaft 24, and make the part of the movable shaft 25 extending to the key groove 27 slide and insert it into the key groove 27, then align one side of the end cover 28 with the limit block 29 and the key groove 27, and insert the limit block 29 into the key groove 27, while the end cover 28 abuts against the connecting shaft 24, first fix the end cover 28 and the connecting shaft 24 with bolt fasteners, and then adjust the axial position of the movable shaft 25 so that the limit block 29 abuts against the part of the movable shaft 25 extending into the key groove 27, and then screw the locking bolts 30 into the limit block 29 and The movable shaft 25 is fixedly connected to the end cover 28. At this time, the movable shaft 25 will not be able to slide axially. At this time, the movable shaft 25 can drive the connecting shaft 24 to rotate by extending to the keyway 27, thereby driving the first gear 18 to rotate for power transmission. When the movable shaft 25 needs to be recovered, the end cover 28 and the connecting shaft 24 are separated by removing the bolt fasteners between the end cover 28 and the connecting shaft 24, and then the locking bolt 30 is screwed in to disconnect the movable shaft 25 from the limit block 29, so as to push the movable shaft 25 to move into the recovery chamber 26 to complete the recovery of the movable shaft 25.

[0034] The rotation of the first gear 18 drives the intermediate shaft 19 to rotate, thereby driving the sun gear 20 to rotate. Since the planetary gears 21 are engaged with the sun gear 20, the planetary gears 21 orbit around the ring gear 22 and rotate themselves, thereby causing the planetary gears 21 to drive the planetary carrier 23 to rotate, and then drive the output shaft 16 to rotate. During the operation of the planetary gear set, the different gear ratios of each structure reduce the input speed, thereby achieving the purpose of deceleration.

[0035] The first flange 13 is fixed to the gear box 14 via bolt fasteners after being in contact with it, and the second flange 15 is fixed to the gear box 14 via bolt fasteners after being in contact with it. At this time, a transmission space 46 is formed inside the first flange 13, the gear box 14, and the second flange 15. The support plate 11 and the reinforcement plate 12 support the housing and are connected to the base plate 10, so that the reduction gear can be normally placed on a plane.

[0036] When installing the first flange 13 and the gear box 14, the outer mounting ring 31 is installed first, and the expansion sealing ring 33 is placed in the second flange 15. At this time, the connecting pipe 34 extends to the outside of the gear box 14 through the second flange 15, and the outer mounting ring 31 is also located outside the gear box 14. Then the first flange 13 is inserted through the middle of the outer mounting ring 31 and abuts against the gear box 14. At this time, the expansion sealing ring 33 is completely located in the second flange 15, and the abutment block 32 is located in the adjacent support plate 11. Then the reinforcing plate 12 and the abutment block 32 are fixed by the connecting piece. At this time, the outer mounting ring 31 cannot move. Since the expansion sealing ring 33 is filled with gas, the expansion sealing ring 33 abuts and squeezes the inner wall of the second flange 15 after expansion, thereby sealing the connection between the gear box 14 and the first flange 13. During the sealing process, the elastic sheet 37 closes the air guide channel 36 to prevent the gas in the intermediate airbag 35 and the expansion sealing ring 33 from escaping.

[0037] After the deceleration device has been used for a long time, the gas in the expansion sealing ring 33 will escape. At this time, the air pressure in the expansion sealing ring 33 will decrease, resulting in a decrease in the abutment pressure with the inner wall of the second flange 15, which reduces its sealing effect. At this time, an inflatable airbag 40 is placed into the inflation chamber 38, and the inflation tube 41 passes through the sliding plate 39 and is inserted into the air guide channel 36 to seal the air guide channel 36. Then, the threaded tightening block 43 is screwed into the inflation chamber 38, and the threaded tightening block 43 is rotated by grasping the handle 44. Under the action of the threaded structure, the inflatable airbag 40 is pushed toward the direction of the air guide channel 36. In the process of the inflatable airbag 40 moving toward the air guide channel 36, the sliding plate 39 is pushed to squeeze the elastic member 42. When the end of the inflation tube 41 is fully inserted and abuts against the two opposite elastic sheets 37, the abutting ends of the two elastic sheets 37 are supported outward to disengage, and then the thread is tightened. Further pressing of the block 43 causes the inflatable airbag 40 to deform, increasing the air pressure in the inflatable airbag 40. When the air pressure difference on both sides of the disposable sealing sheet 47 reaches the rupture value of the disposable sealing sheet 47, the disposable sealing sheet 47 expands and ruptures, and the gas in the inflatable airbag 40 is discharged through the inflation tube 41. At this time, the gas in the inflatable airbag 40 is introduced into the air guide channel 36 through the inflation tube 41, and enters the intermediate airbag 35 through the air guide channel 36. The air pressure in the expansion sealing ring 33, the intermediate airbag 35 and the inflatable airbag 40 remains the same and meets the sealing requirements of the expansion sealing ring 33. At this time, the rotation of the threaded tightening block 43 is stopped, and then when the air pressure in the expansion sealing ring 33 is further reduced, the threaded tightening block 43 is continued to be rotated so that the threaded tightening block 43 further squeezes the inflatable airbag 40, so that the air pressure in the expansion sealing ring 33 always remains stable and meets the sealing requirements.

[0038] When the threaded tightening block 43 completely squeezes and deforms the inflatable airbag 40, so that the gas in the inflatable airbag 40 is fully squeezed out, the inflatable airbag 40 needs to be replaced. At this time, the threaded tightening block 43 is rotated in the opposite direction. The threaded tightening block 43 releases the pressure on the inflatable airbag 40, and the sliding plate 39 pushes the inflatable airbag 40 to slide back under the elastic action of the elastic member 42. When the threaded tightening block 43 is completely unscrewed from the inflation cavity 38, the inflatable airbag 40 can be pulled out. In this process, after the end of the inflation tube 41 is disengaged from the elastic sheet 37, the relatively arranged elastic sheet 37 re-engages to seal the air guide channel 36, so that the gas in the intermediate airbag 35 and the expansion sealing ring 33 cannot be discharged, thereby achieving the purpose of retaining the gas in the expansion sealing ring 33. After the inflatable airbag 40 is removed from the inflation chamber 38, a new inflatable airbag 40 is replaced, and the inflation tube 41 is reinserted into the air guide channel 36. The threaded tightening block 43 is then screwed in so that the threaded tightening block 43 can re-compress the inflatable airbag 40. No external air pump is required, and a replaceable inflatable airbag 40 is used for inflation. When the inflatable airbag 40 is full of air but not completely used up, the air pressure in the expansion sealing ring 33 can be maintained by rotating the threaded tightening block 43. When the inflatable airbag 40 is used up, removal and replacement of the inflatable airbag 40 is relatively simple, and there is no need to disassemble the first flange 13 and the gearbox 14, thereby improving the maintenance efficiency of the reduction gear unit.

[0039] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art will appreciate that the present invention is not limited to the foregoing embodiments and that various modifications and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such modifications and improvements are intended to fall within the scope of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A planetary gear reduction device, characterized in that: include: The shell has a hollow structure inside which forms a transmission space (46). The first gear (18) is disposed in the transmission space (46), A planetary gear set is provided in the transmission space (46), and the planetary gear set is provided with an input end and an output end, wherein the input end is connected to the first gear (18) in a power connection. An output shaft (16) has one end located in the transmission space (46) and connected to the output end of the planetary gear set, and the other end of the output shaft (16) extends to the outside of the housing. A connecting shaft (24) is rotatably disposed in the transmission space (46), the connecting shaft (24) is power-connected to an end of the first gear (18) away from the planetary gear set, and a recovery chamber (26) is disposed in the connecting shaft (24). The movable shaft (25) is inserted into the connecting shaft (24) through the end of the connecting shaft (24) away from the first gear (18). A keyway (27) is provided along the axial direction of the connecting shaft (24) at the connection between the connecting shaft (24) and the movable shaft (25). A limiting structure is provided between the connecting shaft (24) and the movable shaft (25) for limiting the axial movement of the movable shaft (25). An input shaft (17) has one end located in the transmission space (46) and meshing with the first gear (18), and the other end of the input shaft (17) extends to the outside of the housing. The movable shaft (25), the connecting shaft (24), the first gear (18) and the output shaft (16) are coaxially arranged, one end of the keyway (27) is connected to the recovery chamber (26), the other end of the keyway (27) passes through the connecting shaft (24), the movable shaft (25) is inserted into the end of the connecting shaft (24) and extends into the keyway (27) to form a keyway fit, and the portion of the movable shaft (25) extending into the keyway (27) can be moved into the recovery chamber (26) to disengage the keyway fit from the connecting shaft (24).

2. A planetary gear reduction device according to claim 1, characterized in that: The limiting structure includes: The end cover (28) is detachably fixedly arranged on the end surface of the connecting shaft (24) away from the first gear (18), The limit block (29) is located in the keyway (27), one end of the limit block (29) is fixed to the end cover (28), and the other end of the limit block (29) abuts against the portion of the movable shaft (25) extending into the keyway (27). The locking bolt (30) passes through the limit block (29) and the portion of the movable shaft (25) located in the keyway (27) along the axial direction of the movable shaft (25), and the locking bolt (30) is threadedly connected to the limit block (29) and the movable shaft (25).

3. The planetary gear reduction device according to claim 1, characterized in that: The planetary gear set includes: The planetary frame (23) is rotatably arranged in the transmission space (46), and the output shaft (16) is coaxially fixedly connected to the planetary frame (23) An intermediate shaft (19) has one end coaxially connected to the first gear (18), and the other end of the intermediate shaft (19) extends into the planet carrier (23). The sun gear (20) is coaxially fixed to one end of the intermediate shaft (19) located in the planet carrier (23). The planetary gear (21) is rotatably mounted on the planetary carrier (23) and is located on the radial side of the sun gear (20). The planetary gear (21) is meshed with the sun gear (20). The ring gear (22) is fixedly arranged in the transmission space (46), and the ring gear (22) is arranged around the outside of the planetary frame (23), and the planetary gear (21) is meshed with the inner side of the ring gear (22).

4. A planetary gear reduction device according to claim 1, characterized in that: the housing include: First flange (13), The gear box (14) is fixedly arranged in contact with the first flange (13). The second flange (15) is fixedly arranged in contact with an end of the gear box (14) away from the first flange (13). A support structure is fixedly arranged on the gear box (14) to support the gear box (14).

5. A planetary gear reduction device according to claim 4, characterized in that: The supporting structure includes: The bottom plate (10) is provided on the radial side of the gear box (14), A support plate (11) is fixed at one end to the outer surface of the gear box (14), and the other end of the support plate (11) is fixed to the bottom plate (10). A plurality of support plates (11) are provided along the circumference of the gear box (14). The reinforcing plate (12) is fixedly arranged between adjacent supporting plates (11). An installation space (45) is provided at the connection between the support plate (11) and the gear box (14).

6. A planetary gear reduction device according to claim 5, characterized in that: An outer mounting ring (31) is inserted into the mounting space (45). The outer mounting ring (31) is arranged around the abutment of the first flange (13) and the gear box (14). An abutment block (32) is fixed on the outside of the outer mounting ring (31). The abutment block (32) extends between adjacent support plates (11) and is fixed to the reinforcing plate (12) through a connecting piece. An intermediate airbag (35) is arranged in the outer mounting ring (31). A second flange (15) is opened along the circumferential direction on the abutment surface of the gear box (14) and the first flange (13). The second flange (15) is provided with an expansion sealing ring (33). The expansion sealing ring (33) is filled with There is gas, the expansion sealing ring (33) and the intermediate airbag (35) are connected through a plurality of connecting pipes (34), a plurality of air guide channels (36) connected to the intermediate airbag (35) are provided in the outer mounting ring (31), elastic sheets (37) are fixed in the air guide channels (36) and are arranged in abutment with each other, and the elastic sheets (37) close the air guide channels (36) after abutment, and an inflation cavity (38) is provided on the end surface of the outer mounting ring (31) away from the gear box (14), the inflation cavity (38) is connected to the air guide channel (36), and an inflation structure for replenishing gas into the intermediate airbag (35) is provided in the inflation cavity (38).

7. A planetary gear reduction device according to claim 6, characterized in that: Inflatable structures include: The inflatable airbag (40) is detachably arranged in the inflatable cavity (38). The inflation tube (41) is fixedly arranged at one end of the inflation airbag (40) facing the air guide channel (36), the end of the inflation tube (41) extends into the air guide channel (36), and the end of the inflation tube (41) extending to the air guide channel (36) is sealed against the inner wall of the air guide channel (36). A disposable sealing sheet (47) is fixedly arranged inside the inflation tube (41), and the disposable sealing sheet (47) seals the inflation airbag (40). The threaded tightening block (43) is arranged on a side of the inflatable airbag (40) away from the air guide channel (36), and the threaded tightening block (43) is threadedly connected to the inner wall of the inflatable cavity (38). The handle (44) is fixed to the side of the threaded tightening block (43) away from the air guide channel (36), and the end of the handle (44) extends to the outside of the outer mounting ring (31). The reset portion is arranged at the connection point between the interior of the inflation cavity (38) and the air guide channel (36), and is used to push the inflatable airbag (40) to move in a direction away from the air guide channel (36).

8. The planetary gear reduction device according to claim 7, characterized in that: The reset section includes: The sliding plate (39) is axially slidably arranged in the inflation cavity (38) along the outer mounting ring (31), the sliding plate (39) abuts against the inflation airbag (40), and the inflation tube (41) passes through the sliding plate (39). The elastic member (42) is arranged between the sliding plate (39) and the end wall of the inflation cavity (38) facing the air guide channel (36).

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