A plastic electric strut gearbox

Abstract

The utility model provides a plastic electric strut gearbox, including an outer cylinder, the inner wall of which is provided with a first inner gear ring and a second inner gear ring, two reducers are installed inside the outer cylinder, the reducer includes a planetary frame, an axle frame and a planetary gear, the planetary frame is provided with an assembly port and a support beam, the number of the assembly port and the number of the support beam are both 3, the planetary frame includes a first planetary frame and a second planetary frame, the axle frame is provided with three shafts, the assembly port is used to movably install the planetary gear through the shafts, the support beam is provided with a structural hole, and the diameter of the first inner gear ring is greater than the diameter of the second inner gear ring. The planetary frame of the utility model is provided with an assembly port and a support beam, and the number of the assembly port and the number of the support beam are both 3, so that the support beam has a larger design space, the rigidity of the support beam is improved, thereby improving the rigidity of the planetary frame, preventing the planetary frame from being deformed during operation, ensuring the correct meshing position between the gears, and improving the service life of the reduction box.

Description

Technical Field

[0001] The utility model belongs to the technical field of electric struts, and in particular relates to a plastic electric strut gear box. Background Art

[0002] Most electric strut reducers are composed of two-stage planetary gears 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 reducer. When the reducer is running, the planetary carrier of the planetary gear is subjected to a large force. The support beam of the planetary carrier in the prior art is too small, and the planetary carrier is prone to deformation during operation, resulting in incorrect meshing positions between gears. The gears are easily worn out during long-term operation, resulting in damage to the reducer and reducing the service life of the reducer.

[0003] Authorization announcement number CN219795980U discloses a plastic gearbox for a rear door support rod, comprising a housing, the inner wall of the housing forming a toothed portion, and a reduction mechanism connected to a motor or a support rod is arranged in the housing; the reduction mechanism has at least a first-stage planetary reduction mechanism, the first-stage planetary reduction mechanism comprises an integrated shaft frame, a first-stage planetary wheel and a planetary frame, the first-stage planetary wheel is rotated on the planetary frame through the integrated shaft frame, the integrated shaft frame is embedded in the planetary frame, and the outer periphery of the first-stage planetary wheel is meshed with the toothed portion, a first input portion in which the output shaft of the power supply machine is placed is arranged between the first-stage planetary wheels, and a first output portion connected to the support rod or the planetary reduction mechanism is arranged on the planetary frame. A second-stage planetary reduction mechanism is also arranged between the housing and the first-stage planetary reduction mechanism, the second-stage planetary reduction mechanism comprises a fixed frame, a second-stage planetary wheel and an output frame, the second-stage planetary wheel is rotated on the output frame through the fixed frame, the fixed frame is embedded in the output frame, and the second-stage planetary wheel is meshed with the first output portion and the toothed portion, and an internal spline connected to the electric support rod is arranged on the top of the output frame. The support beams of the planetary frame and the output frame are too small. Utility Model Content

[0004] The purpose of the utility model is to provide a plastic electric strut gearbox to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a plastic electric strut gearbox, comprising an outer cylinder, the inner wall of the outer cylinder is provided with a first inner gear ring and a second inner gear ring, two reducers are installed inside the outer cylinder, the reducer comprises a planetary carrier, an axle frame and a planetary gear, the planetary carrier is provided with an assembly port and a support beam, the number of the assembly port and the support beam are both 3, the planetary carrier comprises a first planetary carrier and a second planetary carrier, the axle frame is provided with three shafts, the assembly port is used to movably install the planetary gear through the shafts, the support beam is provided with a structural hole, and the diameter of the first inner gear ring is greater than the diameter of the second inner gear ring.

[0006] Preferably, the structural hole is similar in shape to the supporting beam, and the structural hole is a blind hole.

[0007] Preferably, the ratio of the angle A1 occupied by the assembly opening of the first planet carrier to the angle A2 occupied by the support beam is in the range of 1.35-1.5.

[0008] Preferably, the ratio of the angle B1 occupied by the assembly opening of the second planet carrier to the angle B2 occupied by the support beam is in the range of 1.1-1.3.

[0009] Preferably, the planet carrier is made of plastic.

[0010] Compared with the prior art, the beneficial effects of the utility model are:

[0011] The planetary carrier of the utility model is provided with an assembly opening and a support beam, and the number of the assembly opening and the number of the support beam are both 3, so that the support beam has a larger design space, the rigidity of the support beam is improved, thereby improving the rigidity of the planetary carrier, preventing the planetary carrier from deforming during operation, ensuring the correct meshing position between the gears, and improving the service life of the reduction box. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is an exploded structural view of the utility model.

[0013] Figure 2 It is an exploded structural view of the first-stage reducer of the utility model.

[0014] Figure 3 It is an exploded structural view of the second stage reducer of the utility model.

[0015] Figure 4 It is a structural view of the first planet carrier of the utility model.

[0016] Figure 5 It is a cross-sectional structural view of the first planet carrier of the utility model.

[0017] Figure 6 It is a structural view of the second planetary carrier of the utility model.

[0018] Figure 7 It is a cross-sectional structural view of the first design of the second planetary carrier of the utility model.

[0019] Figure 8 It is a cross-sectional structural view of the second design of the second planetary carrier of the utility model.

[0020] Labels in the figure: outer cylinder 1, first inner gear ring 2, second inner gear ring 3, reducer 4, planet carrier 5, shaft carrier 6, planetary gear 7, assembly port 8, support beam 9, first planet carrier 10, second planet carrier 11, shaft rod 12, structural hole 13. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] Embodiment 1:

[0023] like Figure 1-Figure 8 As shown, the utility model provides a plastic electric strut gearbox, including an outer cylinder 1, the inner wall of the outer cylinder 1 is provided with a first inner gear ring 2 and a second inner gear ring 3, two reducers 4 are installed inside the outer cylinder 1, the reducer 4 includes a planetary frame 5, an axle frame 6 and a planetary wheel 7, the planetary frame 5 is provided with an assembly port 8 and a support beam 9, the number of the assembly port 8 and the support beam 9 are both 3, the planetary frame 5 includes a first planetary frame 10 and a second planetary frame 11, the axle frame 6 is provided with three shafts 12, the assembly port 8 is movably mounted through the shafts 12, the support beam 9 is provided with a structural hole 13, the diameter of the first inner gear ring 2 is greater than the diameter of the second inner gear ring 3. The structural hole 13 is similar to the shape of the support beam 9, and the structural hole 13 is a blind hole. The ratio of the angle A1 occupied by the assembly port 8 of the first planetary frame 10 to the angle A2 occupied by the support beam 9 is in the range of 1.35-1.5. The ratio of the angle B1 occupied by the assembly port 8 of the second planetary frame 11 to the angle B2 occupied by the support beam 9 is in the range of 1.1-1.3. The planet carrier 5 is made of plastic.

[0024] Through the above technical scheme, the planetary carrier 5 of the utility model is provided with an assembly port 8 and a support beam 9, and the number of the assembly port 8 and the support beam 9 are both 3, so that the support beam 9 has a larger design space, and the rigidity of the support beam 9 is improved, thereby improving the rigidity of the planetary carrier 5, preventing the planetary carrier 5 from being deformed during operation, ensuring the correct meshing position between the gears, and improving the service life of the reduction gearbox.

[0025] Embodiment 2:

[0026] like Figure 1-Figure 8As shown, the utility model provides a plastic electric strut gearbox, which aims to solve the problem in the prior art that the planetary carrier 5 is easily deformed during operation due to the small support beam 9 of the planetary carrier 5, and improve the structural stability and service life of the gearbox. The inner wall of the outer cylinder 1 is provided with two inner gear rings of different diameters, namely the first inner gear ring 2 and the second inner gear ring 3. Two reducers 4 are installed inside the outer cylinder 1 to realize the function of multi-stage reduction. The reducer 4 is mainly composed of a planetary carrier 5, an axle frame 6 and a planetary gear 7. The planetary carrier 5 is divided into a first planetary carrier 10 and a second planetary carrier 11 to facilitate the realization of more complex reduction ratios and torque transmission. The outer cylinder 1 is made of high-strength plastic material to ensure that it has a light weight and good impact resistance. The first inner gear ring 2 and the second inner gear ring 3 on the inner wall are respectively used to mesh with the planetary gears 7 of the first and second reducers 4 to achieve speed and torque transmission. The diameter of the first inner gear ring 2 is larger than the diameter of the second inner gear ring 3, which is convenient for installing the accelerator. The planetary carrier 5 is the core component of the entire reducer 4, and is provided with an assembly port 8 and a support beam 9. Among them, the number of assembly ports 8 and support beams 9 are both 3, and each assembly port 8 is movably mounted with a planetary gear 7 through a shaft 12, so that the planetary gear 7 can rotate. A structural hole 13 is provided on the support beam 9 to prevent the planetary carrier 5 from deforming due to the excessive thickness of the plastic during plastic injection molding, which causes severe shrinkage during the cooling stage and affects the product yield. At the same time, it also reduces the weight and material of the planetary carrier 5. The structural hole 13 also greatly improves the rigidity of the support beam 9. The planetary gears 7 on the first planetary carrier 10 and the second planetary carrier 11 are respectively connected to the first inner gear ring 2 and the second inner gear ring 3. The design of the two-stage reducer can achieve a more complex reduction ratio, so that the electric strut can flexibly adjust the support and retraction speed under different working conditions. The shaft frame 6 is provided with three shafts 12, and a planetary gear 7 is installed on each shaft 12.

[0027] When the motor starts, it is firstly decelerated by the first-stage planetary gear system. The motor gear on the motor output shaft drives the first planetary gear 10 to rotate around the shaft 6. At the same time, under the reaction force of the first gear ring 2, the first planetary gear 10 will also revolve at the same time, thereby driving the shaft 6 to revolve. The shaft 6 is limited to the first planetary gear 10, and then the first planet carrier 10 rotates. Since the diameter of the first inner gear ring 2 is large, this stage of deceleration can convert the high speed and low torque of the motor into a low speed and high torque output. The decelerated torque is transmitted to the second-stage planetary carrier mechanism through the sun gear on the first planet carrier. The second planet carrier 11 drives the second-stage planetary gear 7 to engage the second inner gear ring 3 again through its assembly port 8 and support beam 9. The output gear on the first planet carrier drives the planetary gear 7 to rotate around the shaft 6. At the same time, under the reaction force of the second gear ring 3, the planetary gear 7 will also revolve at the same time, thereby driving the shaft 6 to revolve. The shaft 6 is limited to the planetary gear 7, and then the planetary gear 7 rotates. Since the diameter of the second inner gear ring 3 is relatively small, this stage of deceleration further increases the torque output and further reduces the rotation speed, so that the electric strut can be smoothly extended and retracted. The assembly port 8 and the support beam 9 of the planetary carrier 5 adopt a three-point installation structure. Through precise mechanical calculation and optimized design, the structural hole 13 on the support beam 9 reduces the material weight without affecting the strength, and at the same time enhances the anti-deformation ability of the planetary carrier 5. The utility model adopts high-strength plastic material, so that the overall structure is light and has good impact resistance. At the same time, the self-lubricating properties of the plastic material also reduce the friction and noise between the gears, further improving the performance of the device.

[0028] The structural hole 13 of the utility model is similar to the shape of the support beam 9, ensuring that the wall thickness of the support beam 9 is uniform and improving the rigidity of the support beam 9. The structural hole 13 is a blind hole. The support beam 9 bears the load from the revolution of the planetary gear in the gearbox, especially under high-load operation, its rigidity and strength are crucial. By designing the shape of the structural hole 13 to be similar to the shape of the support beam 9, it can ensure that the material distributed on the support beam 9 is more uniform, which can avoid stress concentration, ensure uniform force, and improve the anti-deformation ability of the support beam 9. The overall structural rigidity and stability of the support beam 9 are enhanced. The blind hole design means that the other end of the hole does not penetrate the entire support beam 9, so that sufficient material thickness can be maintained around the hole, further improving the strength and stability of the support beam 9. The blind hole design not only reduces the total weight, but also achieves material optimization without weakening the structural strength. This is especially important for plastic materials, because plastic materials are more easily deformed than metals. The blind hole design not only reduces the weight, but also effectively enhances its anti-deformation ability. Since the wall thickness of the support beam 9 is uniform and the force distribution is more reasonable, the rigidity of the support beam 9 is greatly improved. The enhanced rigidity ensures that the support beam 9 can firmly maintain its shape and function when the gearbox is running under high load, reducing the problem of inaccurate gear meshing caused by deformation. The blind hole not only reduces the weight of the structure, but also ensures that the strength of the support beam 9 is not weakened while reducing the weight. It is particularly effective in reducing motor load and improving system efficiency, while reducing energy consumption and extending the service life of the equipment. The plastic material and blind hole design reduce the overall raw material cost, and the injection molding process is suitable for mass production. These help to reduce the overall production cost, improve production efficiency, and facilitate large-scale production. Due to the uniformity of force and improved structural strength brought about by design optimization, the wear of various parts of the gearbox is reduced and the service life is extended. The uniform distribution of materials reduces stress concentration areas and reduces the probability of fatigue damage, which means that the gearbox remains stable and reliable during long-term, high-load operation, reducing the frequency and cost of maintenance.

[0029] The ratio of the angle A1 occupied by the assembly opening 8 of the first planetary carrier 10 of the utility model to the angle A2 occupied by the support beam 9 is in the range of 1.35-1.5, and the ratio is the optimal value of the size of the support beam 9 and the size of the assembly opening 8 obtained through optimization design. The ratio ensures that the support beam 9 will not be too small, meet the rigidity requirements, and also ensures that the assembly opening 8 will not be too small, and a larger planetary gear can be installed. In the design of the planetary carrier 5, the angle A1 refers to the angle occupied by the assembly opening 8 with any point of the axis of the first planetary carrier 10 as the center, and the angle A2 refers to the angle occupied by the support beam 9 with any point of the axis of the first planetary carrier 10 as the center. The ratio between the two angles directly affects the overall mechanical properties and functional adaptability of the planetary carrier 5. After analysis and calculation, the angle ratio range of 1.35-1.5 is the optimal value between the support beam 9 and the assembly opening 8. This ratio has significant advantages in ensuring structural strength and functionality. Within the angle ratio range, the support beam 9 will not be too small, which is crucial to ensure the rigidity and strength of the support beam 9. A ratio greater than 1.5 results in the support beam 9 being too small, unable to effectively disperse stress, and prone to deformation or fracture under high-load working conditions. This design makes the entire planetary carrier 5 more stable during operation by ensuring the size and rigidity of the support beam 9. Similarly, it is also crucial to ensure that the assembly port 8 is not too small. A ratio less than 1.35 may result in the assembly port 8 being too small to install the required larger planetary gears, affecting the deceleration performance and torque transmission effect of the gearbox. A ratio value between 1.35-1.5 enables the assembly port 8 to adapt to the installation of larger planetary gears, thereby achieving efficient power transmission and deceleration functions. A ratio value between 1.35-1.5 significantly enhances the structural strength and rigidity of the planetary carrier 5. By ensuring that the size of the support beam 9 is moderate, the stress during operation is dispersed and the deformation resistance of the overall structure is improved. Under high load and long-term operation conditions, the stability and reliability of the gearbox are significantly improved.

[0030] The ratio of the angle B1 occupied by the assembly opening 8 of the second planetary carrier 11 of the utility model to the angle B2 occupied by the support beam 9 is in the range of 1.1-1.3. The ratio value is the optimal value of the size of the support beam 9 and the size of the assembly opening 8 obtained through in-depth research and optimized design, ensuring that the support beam 9 will not be too small to meet the rigidity requirements, and also ensuring that the assembly opening 8 will not be too small to install larger planetary gears. In the design of the planetary carrier 5, the angle B1 occupied by the assembly opening 8 refers to the angle occupied by the assembly opening 8 with any point of the axis of the second planetary carrier 11 as the center, and the angle B2 refers to the angle occupied by the support beam 9 with any point of the axis of the second planetary carrier 11 as the center. The ratio between the two angles has a direct impact on the overall performance, stability and functional adaptability of the planetary carrier 5. After analysis and calculation, the angle ratio range of 1.1-1.3 is the optimal ratio value between the assembly opening 8 and the support beam 9 in the second planetary carrier 11. This range can fully guarantee the rigidity of the support beam 9, while also leaving enough space for the assembly opening 8 to ensure the smooth installation and efficient operation of the planetary gear. The angle ratio of 1.1-1.3 ensures good rigidity of the support beam 9. Within this range, the support beam 9 will not be too small and can effectively withstand various loads from the working environment. The support beam 9 with appropriate rigidity can not only distribute the force evenly, but also reduce the risk of deformation or breakage under high-load working conditions.

[0031] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0032] The above description is only used to illustrate the technical solution of the utility model rather than to limit it. Other modifications or equivalent substitutions made to the technical solution of the utility model by ordinary technicians in this field should be included in the scope of the claims of the utility model as long as they do not depart from the spirit and scope of the technical solution of the utility model.

Claims

1. A plastic electric strut gearbox, comprising an outer cylinder, the inner wall of which is provided with a first inner gear ring and a second inner gear ring, and two reducers are installed inside the outer cylinder, characterized in that: The reducer includes a planetary carrier, an axle carrier and planetary wheels. The planetary carrier is provided with an assembly port and a support beam. The number of the assembly port and the support beam are both 3. The planetary carrier includes a first planetary carrier and a second planetary carrier. The axle carrier is provided with three shafts. The assembly port is used to movably install the planetary wheels through the shafts. The support beam is provided with a structural hole. The diameter of the first inner gear ring is greater than the diameter of the second inner gear ring.

2. A plastic electric strut gearbox according to claim 1, characterized in that: The structural hole has a similar shape to that of the support beam, and the structural hole is a blind hole.

3. The plastic electric strut gearbox according to claim 1, characterized in that: The ratio of the angle A1 occupied by the assembly opening of the first planet carrier to the angle A2 occupied by the support beam is in the range of 1.35-1.

5.

4. The plastic electric strut gearbox according to claim 1, characterized in that: The ratio of the angle B1 occupied by the assembly opening of the second planet carrier to the angle B2 occupied by the support beam is in the range of 1.1-1.

3.

5. The plastic electric strut gearbox according to claim 1, characterized in that: The planet carrier is made of plastic.

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