Electric supporting rod planetary gearbox

Abstract

The utility model provides an electric supporting rod planetary gearbox which comprises an outer cylinder, a base is fixedly installed at the bottom of the outer cylinder, an inner gear ring is arranged on the inner wall of the outer cylinder, two speed reducers are installed inside the outer cylinder, each speed reducer comprises a planet carrier and a planet wheel, each planet carrier is provided with an assembly opening, and each planet carrier comprises a first planet carrier and a second planet carrier. A first gasket is movably installed between the base and the first planet carrier, a second gasket is movably installed between the first planet carrier and the second planet carrier, the planet wheel is movably installed on the assembling opening through a shaft rod, and the first gasket, the second gasket and the shaft rod are made of metal materials. The first gasket and the second gasket are used for separating the movable assembly so as to reduce friction and improve the rotation smoothness and stability of the planet carrier, the first gasket, the second gasket and the shaft rod are made of metal materials, the shaft rod made of the metal materials improves the stress bearing capacity of the planet wheel and prevents the shaft rod from being abraded and broken during long-time operation, and the service life of the reduction gearbox is prolonged.

Description

Technical Field

[0001] This utility model belongs to the field of electric strut technology, specifically relating to an electric strut planetary gearbox. Background Technology

[0002] Most electric strut gearboxes consist of two stages of planetary gears connected in series. The input end of the first-stage planetary gear is connected to the motor, and the output end is connected to the input end of the second-stage planetary gear. The output end of the second-stage planetary gear is the output end of the gearbox. When the gearbox is running, the planet carrier of the planetary gears is subjected to a large force, which is applied to the planetary gears. The existing planetary gear shafts are mostly made of plastic. During long-term operation, the shafts are prone to wear and breakage, which can damage the gearbox and affect its service life.

[0003] The utility model patent CN222702526U discloses a plastic electric strut gearbox, including an outer cylinder with a first and second internal gear ring on its inner wall. Two reducers are installed inside the outer cylinder. Each reducer includes a planetary carrier, a shaft carrier, and planetary gears. The planetary carrier has mounting openings and support beams, with three mounting openings and three support beams. The planetary carrier includes a first and a second planetary carrier, and the shaft carrier has three shafts. The planetary gears are movably mounted through the mounting openings via the shafts. The support beams have structural holes. The diameter of the first internal gear ring is larger than that of the second internal gear ring. This utility model's planetary carrier has mounting openings and support beams, and the three mounting openings and support beams allow for greater design space for the support beams, improving their rigidity and thus increasing the rigidity of the planetary carrier. This prevents deformation during planetary carrier operation, ensures correct meshing positions between gears, and extends the gearbox's service life. However, the shafts of the shaft carrier are made of plastic, which is prone to wear and breakage during prolonged operation, leading to gearbox damage and affecting its service life. Utility Model Content

[0004] The purpose of this invention is to provide an electric strut planetary gearbox to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an electric strut planetary gearbox, comprising an outer cylinder, a base fixedly mounted at the bottom of the outer cylinder, an internal gear ring on the inner wall of the outer cylinder, and two reducers installed inside the outer cylinder. Each reducer includes a planet carrier and planetary gears. The planet carrier has an assembly port and includes a first planet carrier and a second planet carrier. A first shim is movably mounted between the base and the first planet carrier, and a second shim is movably mounted between the first planet carrier and the second planet carrier. The planetary gears are movably mounted through the assembly port via a shaft. The first shim, the second shim, and the shaft are made of metal.

[0006] Preferably, the first planetary carrier is provided with an output gear, the top of the output gear is provided with a protrusion, the output gear is provided with a through hole, the second planetary carrier is provided with an internal spline shaft, and the second planetary carrier is provided with a connecting hole on the axis of the internal spline shaft, the protrusion is movably connected to the connecting hole.

[0007] Preferably, the base is provided with symmetrical arc ribs, and the arc ribs are in movable contact with the first gasket.

[0008] Preferably, both the outer cylinder and the base are made of plastic, and the outer cylinder and the base are fixed together by laser welding.

[0009] Preferably, the first gasket, the second gasket, and the shaft are all made of stainless steel.

[0010] Preferably, the base is provided with mounting holes, and the motor is fixedly connected to the mounting holes by bolts.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] The planetary carrier of this utility model has an assembly port, through which planetary gears are movably mounted. A first shim is movably mounted between the base and the first planetary carrier, and a second shim is movably mounted between the first planetary carrier and the second planetary carrier. The first and second shims are used to separate the base and the first planetary carrier, and the first planetary carrier and the second planetary carrier, thereby improving the smoothness and stability of the planetary carrier's rotation and reducing friction noise. The first shim, the second shim, and the shaft are made of metal. The metal shaft improves the load-bearing capacity of the planetary gears, prevents wear and breakage of the shaft during long-term operation, and extends the service life of the gearbox. Attached Figure Description

[0013] Figure 1 This is a structural view of the present invention.

[0014] Figure 2 This is an exploded structural view of the present invention.

[0015] Figure 3 This is a structural view of the reducer using the first planetary carrier of this utility model.

[0016] Figure 4 This is an exploded structural view of the reducer using the first planetary carrier of this utility model.

[0017] Figure 5 This is a structural view of the reducer using the second planetary carrier of this utility model.

[0018] Figure 6 This is an exploded structural view of the reducer using the second planetary carrier of this utility model.

[0019] Figure 7 This is a structural view of the base of this utility model.

[0020] The diagram is labeled as follows: Outer cylinder 1, base 2, internal gear ring 3, reducer 4, planetary carrier 5, planetary gear 6, assembly port 7, first planetary carrier 8, second planetary carrier 9, first shim 10, second shim 11, shaft 12, output gear 13, protrusion 14, through hole 15, internal spline shaft 16, connecting hole 17, arc rib 18, assembly hole 19, bolt 20, motor 21. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Example 1:

[0023] like Figures 1-7 As shown, the present invention provides an electric strut planetary gearbox, comprising an outer cylinder 1, a base 2 fixedly mounted on the bottom of the outer cylinder 1, an internal gear ring 3 on the inner wall of the outer cylinder 1, and two reducers 4 installed inside the outer cylinder 1. Each reducer 4 includes a planet carrier 5 and planet gears 6. The planet carrier 5 has an assembly port 7 and includes a first planet carrier 8 and a second planet carrier 9. A first shim 10 is movably mounted between the base 2 and the first planet carrier 8, and a second shim 11 is movably mounted between the first planet carrier 8 and the second planet carrier 9. The planet gears 6 are movably mounted on the assembly port 7 via a shaft 12. The first shim 10, the second shim 11, and the shaft 12 are made of metal. The first planet carrier 8 has an output gear 13 with a protrusion 14 on its top and a through hole 15. The second planet carrier 9 has an internal spline shaft 16, and a connecting hole 17 is provided on the axis of the internal spline shaft 16. The protrusion 14 is movably connected to the connecting hole 17. The base 2 has symmetrically arranged arc ribs 18, which movably abut against the first gasket 10. Both the outer cylinder 1 and the base 2 are made of plastic, and the outer cylinder 1 and base 2 are fixed together by laser welding. The first gasket 10, the second gasket 11, and the shaft 12 are all made of stainless steel. The base 2 has mounting holes 19, which are fixedly connected to the motor 21 by bolts 20.

[0024] Through the above technical solution, the planetary carrier 5 of this utility model is provided with an assembly port 7. The planetary gear 6 is movably installed in the assembly port 7 through the shaft 12. A first shim 10 is movably installed between the base 2 and the first planetary carrier 8, and a second shim 11 is movably installed between the first planetary carrier 8 and the second planetary carrier 5. The first shim 10 and the second shim 11 are used to separate the planetary carrier and the shaft 12, improve the smoothness and stability of the rotation of the planetary carrier 5, reduce friction noise, and prevent wear caused by different speeds between plastic parts and the occurrence of friction whistling and other bad noises during operation. The first shim 10, the second shim 11 and the shaft 12 are made of metal. The metal shaft 12 improves the load-bearing capacity of the planetary gear 6, prevents wear and breakage of the shaft 12 during long-term operation, and improves the service life of the gearbox.

[0025] Example 2:

[0026] like Figures 1-7 As shown, the outer cylinder 1 of this utility model serves as the outer shell of the overall structure, protecting the internal parts. The base 2 is fixedly installed at the bottom of the outer cylinder 1, providing stable support for the entire device. The internal gear ring 3 is disposed on the inner wall of the outer cylinder 1, meshing with the planetary gears 6 to form a planetary gear transmission system. Two reducers 4 are installed inside the outer cylinder 1, each reducer 4 consisting of a planet carrier 5 and planetary gears 6. The planet carrier 5 is provided with mounting ports 7 for mounting the planetary gears 6. The planet carrier 5 is divided into two types: a first planet carrier 8 and a second planet carrier 5.

[0027] A first washer 10 is movably installed between the base 2 and the first planetary carrier 8. The first washer 10 serves to separate and fix the spacer while allowing the first planetary carrier 8 to rotate freely relative to the base 2. A second washer 11 is movably installed between the first planetary carrier 8 and the second planetary carrier 5. The second washer 11 also serves to separate and fix the spacer while allowing relative movement between the two planetary carriers 5. The planetary gear 6 is movably installed in the assembly port 7 via a shaft 12. The shaft 12 is a cylindrical structure, with its two ends fixed to the upper and lower walls of the assembly port 7, respectively, and its middle section movably connected to the planetary gear 6, allowing the planetary gear 6 to rotate freely around the shaft 12.

[0028] The first shim 10, the second shim 11, and the shaft 12 are all made of metal, possessing good strength and wear resistance, as well as reducing frictional noise and abnormal sounds. The metal material ensures the gearbox maintains stable performance during long-term use, preventing component deformation or wear. The use of metal shims reduces direct friction between the planetary carrier 5 and the base 2, lowering operating noise and vibration. The metal shaft 12 enhances the load-bearing capacity of the planetary gears 6, preventing excessive wear or breakage during prolonged operation.

[0029] Example 3:

[0030] like Figures 1-7As shown, the first planetary carrier 8 of this invention is provided with an output gear 13. The output gear 13 is located on the top of the first planetary carrier 8 and is used to transmit the decelerated power. The top of the output gear 13 is provided with a protrusion 14, which is a cylindrical structure and protrudes from the gear surface. The output gear 13 is also provided with a through hole 15, which passes through the body of the output gear 13 and the protrusion 14 and is coaxial with the protrusion 14.

[0031] The second planetary carrier 5 is equipped with an internal splined shaft 16. The internal splined shaft 16 is the power output structure of the gearbox. It is a hollow shaft with splines machined on its inner wall for mating with other transmission components. A connecting hole 17 is located at the center of the internal splined shaft 16 on the second planetary carrier 5. The connecting hole 17 is circular, and its diameter is slightly larger than the diameter of the top protrusion 14 of the output gear 13 of the first planetary carrier 8.

[0032] The protrusion 14 is movably connected to the connecting hole 17. Specifically, the protrusion 14 on the top of the output gear 13 of the first planetary carrier 8 is inserted into the connecting hole 17 in the center of the splined shaft 16 inside the second planetary carrier 5. This connection method allows the protrusion 14 to rotate freely within the connecting hole 17, but it remains fixed in the radial direction.

[0033] The engagement of protrusion 14 and connecting hole 17 fixes the output gear 13 of the first planetary carrier 8 onto the axis of the second planetary carrier 5. This positioning method ensures the coaxiality between the two planetary carriers 5, improving the stability and accuracy of the entire transmission system.

[0034] The through-hole 15 on the output gear 13 also plays an important role. The through-hole 15 facilitates the entry of lubricating oil into the space between the protrusion 14 and the connecting hole 17. During gearbox operation, lubricating oil can flow through the through-hole 15 into the contact area between the protrusion 14 and the connecting hole 17, forming an oil film. This oil film effectively reduces friction between the two components, lowers wear, and extends service life.

[0035] The internal spline shaft 16 facilitates subsequent power transmission. The internal spline allows for easy connection to other transmission components, such as output shafts or other mechanical devices. This design increases the gearbox's applicability and flexibility, enabling it to adapt to different application scenarios and connection requirements.

[0036] A raised sealing cover is provided on the base. The sealing cover is cylindrical and coaxially arranged with the first planetary carrier. The sealing cover has a through hole through which the output shaft of the motor passes to prevent the lubricating oil inside the gearbox from entering the motor and to prevent the motor from short-circuiting.

[0037] At the same time, the sealing cover also plays a role in stabilizing the first planetary carrier. Specifically, the sealing cover is movably inserted into the movable hole at the bottom of the first planetary carrier to ensure the coaxiality of the first planetary carrier and the second planetary carrier, thereby improving the stability of the gearbox operation.

[0038] Example 4:

[0039] like Figures 1-7 As shown, the base 2 of this utility model is symmetrically provided with arc ribs 18. The arc ribs 18 are arc-shaped structures and are distributed in the circumferential direction of the base 2. These arc ribs 18 are in movable contact with the first pad 10 to form a dynamic support structure.

[0040] Specifically, the ribs 18 on the base 2 are evenly distributed along the circumference. Each rib 18 is a structure that protrudes upward 14 from the surface of the base 2, with its top being arc-shaped. The height of the ribs 18 is appropriate so that they can maintain good contact with the lower surface of the first pad 10. The width of the ribs 18 is designed according to actual needs to provide sufficient support area.

[0041] The arc rib 18 and the first washer 10 make movable contact. As the first washer 10 rotates with the first planetary carrier 8, it slides on top of the arc rib 18. Due to the arc-shaped design of the arc rib 18, the contact area is small and changes continuously with rotation. This dynamic contact method significantly reduces friction and wear between the first washer 10 and the base 2.

[0042] The arc ribs 18 increase the structural strength of the base 2. By adding these protrusions 14 to the base 2, the rigidity of the base 2 is improved, reducing potential deformation during use. This is crucial for maintaining the accuracy and stability of the entire gearbox. Secondly, the uniform distribution of the arc ribs 18 ensures balanced support for the first shim 10. Stable support force is provided regardless of the position of the first shim 10.

[0043] The movable contact between the arc rib 18 and the first gasket 10 effectively reduces friction and wear between them. Traditional planar contact results in a larger contact area, increasing friction and wear. The arc-shaped contact significantly reduces the contact area, thus substantially reducing friction.

[0044] This design also facilitates the distribution and flow of lubricating oil. The space between the arc ribs 18 can store a certain amount of lubricating oil, which is driven to flow when the first gasket 10 rotates, creating a dynamic lubrication effect. This further reduces friction and improves the smoothness of operation.

[0045] Example 5:

[0046] like Figures 1-7As shown, the outer cylinder 1 and base 2 of this utility model are made of plastic. The connection between the outer cylinder 1 and the base 2 is fixed by laser welding. During the manufacturing process, the outer cylinder 1 and base 2 are first processed into the required shapes. The reducer 4 is installed inside the outer cylinder 1, and the motor 21 is fixed to the base 2 by bolts 20. Next, a positioning device is used to align the outer cylinder 1 and base 2 to ensure their coaxiality and perpendicularity. Subsequently, a laser welding device is used to perform circumferential welding along the connection. During the laser welding process, welding parameters such as laser power, welding speed, and welding depth are controlled to ensure weld quality.

[0047] After welding, the weld is inspected, including visual inspection and X-ray non-destructive testing, to ensure that the weld strength and sealing performance meet the requirements. This laser welding method creates a connection with high strength and excellent sealing, effectively preventing gear oil leakage. Simultaneously, due to the small heat-affected zone, thermal deformation of the parts is reduced, ensuring the geometric accuracy of the outer cylinder 1 and the base 2.

[0048] Furthermore, laser welding offers advantages such as high automation and fast welding speed, improving production efficiency. In practical applications, this connection method significantly enhances the overall rigidity and stability of the gearbox, reducing vibration and noise during operation. Compared to traditional bolt connections or interference fits, laser welding avoids problems such as bolt loosening and wear on mating surfaces, extending the gearbox's service life. This connection method also simplifies assembly processes, reduces the number of parts, and lowers production costs.

[0049] During long-term use, the laser-welded joints are less prone to loosening or cracking, maintaining good sealing performance, preventing the intrusion of dust and moisture, and improving the gearbox's adaptability to harsh environments.

[0050] Example 6:

[0051] like Figures 1-7As shown, the first gasket 10, the second gasket 11, and the shaft 12 of this invention are all made of stainless steel. During manufacturing, the first gasket 10 and the second gasket 11 are produced using precision stamping or laser cutting technology to create gasket blanks of the required shape and size. Then, precision grinding is performed to ensure that the flatness and roughness of the gasket surface meet the requirements. For the shaft 12, a CNC lathe is used for preliminary machining to form the basic outline of the shaft 12. Subsequently, a precision grinding machine is used to finish the surface of the shaft 12, ensuring its cylindricity and surface smoothness. After machining, these parts are heat-treated to improve their hardness and wear resistance. During gearbox operation, the stainless steel gaskets can effectively distribute and transfer loads, reduce stress concentration, and maintain good dimensional stability. The stainless steel shaft 12 provides stable rotational support for the planetary gears 6; its high hardness and wear resistance reduce wear and maintain long-term operational accuracy.

[0052] Example 7:

[0053] like Figures 1-7 As shown, the base 2 of this utility model is designed with mounting holes 19 for fixed connection to the motor 21 via bolts 20. During manufacturing, the base 2 is precision machined using a CNC machining center to drill the mounting holes 19 at predetermined positions, or the mounting holes 19 are pre-drilled during injection molding of the base 2. After machining, the mounting holes 19 are deburred to ensure smooth hole walls. During installation, the motor 21 is first placed on the base 2, aligned with the mounting holes 19. Bolts 20 pass through the mounting holes 19 to securely connect the motor 21 to the base 2. In practical use, this connection method significantly improves the connection stability between the motor 21 and the gearbox, reducing vibration and noise during operation.

[0054] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0055] The above description is only used to illustrate the technical solution of this utility model and is not intended to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solution of this utility model, as long as they do not depart from the spirit and scope of the technical solution of this utility model, should be covered within the scope of the claims of this utility model.

Claims

1. An electric strut planetary gearbox, comprising an outer cylinder, a base fixedly mounted on the bottom of the outer cylinder, an internal gear ring provided on the inner wall of the outer cylinder, and two reducers installed inside the outer cylinder, each reducer comprising a planet carrier and planet gears, the planet carrier having an assembly port, and the planet carrier comprising a first planet carrier and a second planet carrier, characterized in that... The first gasket is movably arranged between the base and the first planet carrier, the second gasket is movably arranged between the first planet carrier and the second planet carrier, and the assembly opening movably arranges the planet wheel through a shaft rod, and the first gasket, the second gasket and the shaft rod are metal materials.

2. An electric hold open pole planetary gearbox as claimed in claim 1, characterised in that, The first planet carrier is provided with an output gear, the top of the output gear is provided with a protrusion, the output gear is provided with a through hole, the second planet carrier is provided with an inner spline shaft, the second planet carrier is provided with a connecting hole on the axis of the inner spline shaft, and the protrusion is movably connected with the connecting hole.

3. An electrically powered prop rod planetary gearbox according to claim 1, wherein, The base is symmetrically provided with an arc rib, and the arc rib movably abuts against the first gasket.

4. An electric hold open pole planetary gearbox as claimed in claim 1, wherein, The outer cylinder and the base are plastic materials, and the outer cylinder and the base are fixed by laser welding.

5. An electrically powered prop rod planetary gearbox according to claim 1, wherein, The materials of the first gasket, the second gasket and the shaft rod are stainless steel materials.

6. An electric hold open pole planetary gearbox as claimed in claim 1, characterized in that, The base is provided with an assembly hole, and the assembly hole is fixedly connected with a motor through bolts.

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