Mute miniature planetary gearbox

Abstract

The utility model provides a mute miniature planetary gear box, and relates to the technical field of gear boxes, the mute miniature planetary gear box comprises a box body, a motor gear, an inner gear, a planetary plate, a planetary gear, a power output plate and an output shaft, the motor gear, the planetary plate and the power output plate are sequentially arranged in the box body, the inner gear is arranged on the outer side of the motor gear, and the planetary gear is arranged on the outer side of the output shaft. The planetary gear is arranged on the planetary plate, the output shaft is connected with the power output plate and extends out of the box body, a ball bearing structure is arranged between the power output plate and the output shaft, and the contact rate of the motor gear, the contact rate of the inner gear and the contact rate of the planetary gear are respectively set to be larger than 1. The gear box is simple in structure and reasonable in design, gear collision during operation is avoided by setting the reasonable gear contact rate, the operation efficiency of the gear box is improved, and noise generated when the gear box works is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of gearboxes, and more particularly, to a silent micro planetary gearbox. Background Art

[0002] A micro planetary gearbox set has a planetary gear reduction mechanism inside. It can be paired with a brushless motor or a brushed motor to drive the gearbox set, achieving the effects of fast and labor-saving operation. During the operation of the micro gearbox, due to the transmission error and time-varying stiffness between gears, vibration noise occurs in the gearbox, which limits its application in products with high noise requirements. At the same time, the gear transmission efficiency of the existing gearbox is not good, and when used with a high-efficiency brushless motor, it cannot meet the requirements of high-efficiency energy saving.

[0003] In view of this, the present application aims to provide a silent micro planetary gearbox to better solve the above technical problems. Summary of the Invention

[0004] The purpose of the embodiments of the present application is to provide a silent micro planetary gearbox, which can solve the technical problem of excessive noise during the operation of the micro gearbox.

[0005] The embodiments of the present application provide a silent micro planetary gearbox, including a box body, a motor gear, an internal gear, a planetary disk, planetary gears, a power output disk, and an output shaft. The motor gear, the planetary disk, and the power output disk are sequentially arranged in the box body. The internal gear is arranged outside the motor gear. The planetary gears are arranged on the planetary disk. The output shaft is connected to the power output disk and extends out of the box body. And a ball bearing structure is provided between the power output disk and the output shaft. The contact ratios of the motor gear, the internal gear, and the planetary gears are respectively set to be greater than 1.

[0006] Further, the output shaft and the power output disk are riveted and connected.

[0007] Further, one set of the ball bearing structures is provided, and one set of the ball bearing structures is sleeved on the output shaft.

[0008] Further, a rear cover is provided at the rear end of the box body, and the rear cover is screwed to the box body.

[0009] Further, the planetary gears include a front planetary gear and a rear planetary gear.

[0010] Further, the pair contact sliding ratio of the motor gear is set to -2.725, the pair contact sliding ratio of the rear planetary gear is set to -2.030, the pair contact sliding ratio of the front planetary gear is set to -0.353, and the pair contact sliding ratio of the internal gear is set to -0.901.

[0011] Furthermore, the tooth root bending strength of the motor gear is set to 6.09, the tooth root bending strength of the rear planetary gear is set to 3.22, the tooth root bending strength of the front planetary gear is set to 2.93, and the tooth root bending strength of the internal gear is set to 6.34.

[0012] Advantages of the present utility model:

[0013] The silent micro planetary gearbox provided by the present utility model includes a box body, a motor gear, an internal gear, a planetary disk, planetary gears, a power output disk and an output shaft. The motor gear, the planetary disk and the power output disk are sequentially arranged in the box body. The internal gear is arranged outside the motor gear. The planetary gears are arranged on the planetary disk. The output shaft is connected to the power output disk and extends out of the box body. And a ball bearing structure is provided between the power output disk and the output shaft. The contact ratios of the motor gear, the internal gear and the planetary gears are respectively set to be greater than 1. The structure of the present utility model is simple and reasonable in design. By setting reasonable contact ratios of the gears, the generation of gear impacts during operation is avoided, so as to increase the operating efficiency of the gearbox and reduce the noise during the operation of the gearbox. Description of the Drawings

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application and should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0015] Figure 1 Structural schematic diagram in some embodiments of the present utility model;

[0016] Figure 2 Internal sectional structural schematic diagram in some embodiments of the present utility model;

[0017] Figure 3 Noise test diagram of the gearbox in some embodiments of the present utility model, where Fig. a is the noise test result of the gearbox with unmodified gears in the prior art, and Fig. b is the noise test result of the gearbox with modified gears in the embodiment.

[0018] Reference numerals are respectively:

[0019] Box body 1, rear cover 11, motor gear 2, internal gear 3, planetary disk 4, planetary gears 5, front planetary gear 51, rear planetary gear 52, power output disk 6, output shaft 7, ball bearing structure 8. Detailed Embodiments

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the following will clearly and completely describe the technical solutions in the embodiments of this application with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, rather than all of them. Components of the embodiments of this application usually described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts fall within the scope of protection of this application.

[0022] It should be noted that similar reference numerals and letters indicate similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0023] In the description of this application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of this application is usually placed during use. It is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and should not be construed as indicating or implying relative importance.

[0024] In addition, terms such as "horizontal", "vertical", "overhanging", etc. do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0025] In the description of this application, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific situations.

[0026] See Figures 1 - 2As shown in the figure, the silent micro planetary gearbox described in this embodiment includes a box body 1, a motor gear 2, an internal gear 3, a planetary disc 4, planetary gears 5, a power output disc 6, and an output shaft 7. The motor gear 2, the planetary disc 4, and the power output disc 6 are sequentially arranged in the box body 1. The internal gear 3 is arranged outside the motor gear 2. The planetary gears 5 are arranged on the planetary disc 4. The output shaft 7 is connected to the power output disc 6 and extends out of the box body 1. And a ball bearing structure 8 is provided between the power output disc 6 and the output shaft 7. The contact ratios of the motor gear 2, the internal gear 3, and the planetary gears 5 are respectively set to be greater than 1.

[0027] The structure of this embodiment is simple and reasonably designed. By setting the reasonable contact ratios of the gears, the generation of gear impacts during operation is avoided, so as to increase the operating efficiency of the gearbox and reduce the noise during the operation of the gearbox.

[0028] Specifically, in this embodiment, the output shaft 7 and the power output disc 6 are riveted and connected.

[0029] In this embodiment, by riveting and connecting the output shaft 7 and the power output disc 6, the stability of the connection position can be ensured, and effective transmission can be achieved.

[0030] Specifically, in this embodiment, one set of the ball bearing structure 8 is provided, and one set of the ball bearing structure 8 is sleeved on the output shaft 7.

[0031] In this embodiment, by providing one set of the ball bearing structure 8, the smoothness of the transmission during the operation of the output shaft 7 can be ensured, thereby avoiding the generation of vibration and reducing the noise.

[0032] In some embodiments, a rear cover 11 is provided at the rear end of the box body 1, and the rear cover 11 is screwed to the box body 1.

[0033] Such a setting in this embodiment facilitates the assembly of the gearbox. During specific assembly, the ball bearing structure 8 can be installed first, then the output shaft 7 and the power output disc 6 are riveted into one body. After that, the power output disc 6 group and the internal gear 3 group are assembled. Finally, the planetary disc 4 and the planetary gears 5 are sequentially placed in, and then the rear cover 11 is screwed and fixed, and the assembly of the gearbox is completed.

[0034] In some embodiments, the planetary gear 5 includes a front planetary gear 51 and a rear planetary gear 52.

[0035] Specifically, the contact sliding ratio of the motor gear 2 is set to -2.725, the contact sliding ratio of the rear planetary gear 52 is set to -2.030, the contact sliding ratio of the front planetary gear 51 is set to -0.353, and the contact sliding ratio of the internal gear 3 is set to -0.901.

[0036] Specifically, the tooth root bending strength of the motor gear 2 is set to 6.09, the tooth root bending strength of the rear planetary gear 52 is set to 3.22, the tooth root bending strength of the front planetary gear 51 is set to 2.93, and the tooth root bending strength of the internal gear 3 is set to 6.34.

[0037] In this embodiment, by modifying the gears, the contact sliding rate between teeth is reduced, thereby effectively reducing the vibration noise between teeth and increasing the service life of the gears; at the same time, the tooth root bending strength (safety factor) is increased, which can reduce the elastic deformation caused by the gear load, and further reduce the vibration noise between teeth.

[0038] Specifically, in this embodiment, before the gears are modified, the contact sliding rate of the motor gear 2 is set to -3.671, the contact sliding rate of the rear planetary gear 52 is set to -3.196, the contact sliding rate of the front planetary gear 51 is set to -8.116, and the contact sliding rate of the internal gear 3 is set to -0.420; the tooth root bending strength of the motor gear 2 is set to 4.72, the tooth root bending strength of the rear planetary gear 52 is set to 3.14, the tooth root bending strength of the front planetary gear 51 is set to 2.66, and the tooth root bending strength of the internal gear 3 is set to 5.56. The gearbox in this embodiment and the gearbox with unmodified gears in the prior art are continuously subjected to vibration tests. See Figure 3 As shown, the vibration and noise of the gearbox group in this embodiment are effectively reduced, and the reliability of the gearbox is improved, which can better meet the use requirements.

[0039] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A silent micro planetary gearbox, characterized in that: It includes a box body, a motor gear, an internal gear, a planetary disc, planetary gears, a power output disc and an output shaft. The motor gear, the planetary disc and the power output disc are sequentially arranged in the box body. The internal gear is arranged outside the motor gear. The planetary gears are arranged on the planetary disc. The output shaft is connected to the power output disc and extends out of the box body. And a ball bearing structure is provided between the power output disc and the output shaft. The contact ratios of the motor gear, the internal gear and the planetary gears are respectively set to be greater than 1.

2. The silent micro planetary gearbox according to claim 1, characterized in that: The output shaft and the power output disc are riveted and connected.

3. The silent micro planetary gearbox according to claim 1, wherein: One set of the ball bearing structures is provided, and one set of the ball bearing structures is sleeved on the output shaft.

4. The silent micro planetary gearbox according to claim 1, wherein: A rear cover is provided at the rear end of the box body, and the rear cover is screwed to the box body.

5. The silent micro planetary gearbox according to claim 1, characterized in that: The planetary gears include front planetary gears and rear planetary gears.

6. The silent micro planetary gearbox according to claim 5, characterized in that: The pair contact sliding ratio of the motor gear is set to -2.725, the pair contact sliding ratio of the rear planetary gear is set to -2.030, the pair contact sliding ratio of the front planetary gear is set to -0.353, and the pair contact sliding ratio of the internal gear is set to -0.

901.

7. The silent micro planetary gearbox according to claim 6, wherein: The tooth root bending strength of the motor gear is set to 6.09, the tooth root bending strength of the rear planetary gear is set to 3.22, the tooth root bending strength of the front planetary gear is set to 2.93, and the tooth root bending strength of the internal gear is set to 6.34.

Images