Gear transmission system
By designing a stable support and positioning structure for the input gear and idler gear in the EMB gearbox, the problem of the center distance accuracy between the input gear and idler gear was solved, achieving stable meshing and noise reduction, extending the service life of the gears and improving the positioning accuracy of the idler gear shaft.
Patent Information
- Application Number
- CN202422742440.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-11
- Publication Date
- 2025-10-31
- Estimated Expiration
- 2034-11-11
AI Technical Summary
The center distance between the input gear and the idler gear in the EMB gearbox is difficult to guarantee, resulting in high meshing noise and short service life, as well as poor positioning accuracy of the idler gear shaft.
The input gear is mounted on the input shaft, which is supported at both ends on the gearbox housing. The idler shaft is fixed on the gearbox housing and supported and lubricated by structures such as rolling bearings, needle roller bearings, and self-lubricating washers. Combined with the design of the planetary output assembly, it ensures stable meshing between the input gear and the idler and the positioning accuracy of the idler shaft.
This achieves stable meshing between the input gear and the idler gear, reduces meshing noise, extends the service life of the input gear, and improves the positioning accuracy of the idler gear shaft.
Smart Images
Figure CN223498638U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of gear transmission technology, and in particular to a gear transmission system. Background Technology
[0002] Gear transmission systems play a crucial role in mechanical transmission structures. Among them, the EMB (Electromechanical Brake System) gearbox is a commonly used gear transmission system. In the primary gear transmission of an EMB gearbox, the input gear is integrated with the motor shaft, without support between it and the gearbox housing. This single-support structure of the input gear leads to significant deflection of the motor shaft, making it difficult to guarantee the center distance accuracy between the input gear and the idler gear. Furthermore, the high speed of the input gear and large center distance deviation easily result in meshing noise. The single-support structure also makes the input gear prone to tilting, leading to uneven distribution of tooth load and severely impacting gear lifespan. Moreover, the idler gear meshing with the input gear typically employs a double-support structure, with two deep groove ball bearings connected to the gearbox housing. However, deep groove ball bearings are floating bearings with radial clearance, resulting in poor positioning accuracy of the idler gear shaft.
[0003] Therefore, a gear transmission system is needed to solve the above problems. Utility Model Content
[0004] The purpose of this utility model is to provide a gear transmission system that can effectively support the input gear, ensure stable meshing between the input gear and the idler gear, and ensure the positioning accuracy of the idler gear shaft.
[0005] To achieve this objective, the present invention adopts the following technical solution:
[0006] Gear transmission system, including:
[0007] A gearbox housing having a hollow mounting cavity;
[0008] An input transmission assembly is disposed in the mounting cavity, including an input shaft and an input gear. The two ends of the input shaft are disposed on the gearbox housing, and the input shaft is rotatable relative to the gearbox housing. The input gear is fixedly sleeved on the input shaft.
[0009] An idler assembly is disposed in the mounting cavity and includes an idler shaft and an idler body. The idler shaft is fixedly disposed on the gearbox housing, and the idler body is rotatably sleeved on the idler shaft, and the idler body meshes with the input gear.
[0010] A primary output component, which is rotatably disposed in the gearbox housing and is connected to the idler gear assembly for transmission.
[0011] A planetary output assembly is partially housed within the gearbox housing and is connected to the primary output assembly for power output.
[0012] In some embodiments, rolling bearings are fixedly provided at both ends of the input shaft, and the outer rings of the rolling bearings are fixedly provided on the gearbox housing.
[0013] In some embodiments, a wave-shaped washer is sandwiched between one of the rolling bearings and the gearbox housing.
[0014] In some embodiments, a needle roller bearing is fixedly sleeved on the idler shaft, and the idler body is fixedly sleeved on the needle roller bearing.
[0015] In some embodiments, a self-lubricating washer is fitted on the idler shaft, and the self-lubricating washer is located between the idler body and the gearbox housing.
[0016] In some embodiments, the primary output component includes an output gear and an output shaft, the output shaft being rotatably disposed in the gearbox housing, the output gear being fixedly sleeved on the output shaft, and the output gear meshing with the idler gear body.
[0017] In some embodiments, the planetary output assembly includes a sun gear, planet gears, a planet carrier, and an internal gear ring. The sun gear is fixedly mounted on the output shaft, the internal gear ring is fixedly mounted in the gearbox housing, and the planet gears are rotatably mounted on the planet carrier, meshing with the internal gear ring and the sun gear.
[0018] In some embodiments, a plurality of positioning grooves are spaced apart on the internal gear ring along the axial direction of the internal gear ring, and a plurality of positioning bolts are provided in a one-to-one correspondence with the plurality of positioning grooves. The positioning bolts pass through the positioning grooves and are connected to the gearbox housing.
[0019] In some embodiments, a planetary flange bushing is provided on the gearbox housing, one end of the planet carrier extends relative to the planetary flange bushing, and an elastic pad is fixedly provided on the flange surface of the planetary flange bushing facing the planet carrier.
[0020] In some embodiments, the elastic pad and the planetary flange bushing are vulcanized into an integrated structure.
[0021] The beneficial effects of this utility model are:
[0022] This utility model provides a gear transmission system in which parts of an input transmission component, an idler gear component, a first-stage output component, and a planetary output component are housed within a gearbox housing. The input shaft of the input transmission component is rotatably supported on the gearbox housing at both ends. The idler gear shaft of the idler gear component is fixedly mounted on the gearbox housing. The input gear meshes with the idler gear body, which is then connected to the first-stage output component. The planetary output component is also connected to the first-stage output component, thus achieving power output. Because the input gear is mounted on the input shaft, and both ends of the input shaft are supported by the gearbox housing, the input gear is effectively supported, ensuring that the center distance between the input gear and the idler gear body meets the requirements, enabling stable meshing, reducing meshing noise, and extending the service life of the input gear. Furthermore, since the idler gear shaft is fixedly mounted on the gearbox housing, the positioning accuracy of the idler gear shaft is guaranteed. Attached Figure Description
[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.
[0024] Figure 1 This is a cross-sectional view of a gear transmission system according to this utility model;
[0025] Figure 2 This is a schematic diagram of a planetary carrier in a gear transmission system according to the present invention;
[0026] Figure 3 This is a schematic diagram of an internal gear ring in a gear transmission system according to this utility model;
[0027] Figure 4 This is a cross-sectional view of a planetary flange bushing in a gear transmission system according to the present invention;
[0028] Figure 5 This is a schematic diagram of a positioning bolt in a gear transmission system according to the present invention.
[0029] In the picture:
[0030] 1. Gearbox housing; 11. Planetary flange bushing; 12. Elastic gasket; 2. Input transmission assembly; 21. Input shaft; 22. Input gear; 23. Rolling bearing; 24. Waveform washer; 3. Idler assembly; 31. Idler shaft; 32. Idler body; 33. Self-lubricating washer; 34. Needle roller bearing; 4. First stage output assembly; 41. Output shaft; 42. Output gear; 5. Planetary output assembly; 51. Sun gear; 52. Planetary gears; 53. Internal gear ring; 531. Locating groove; 54. Planetary carrier; 6. Locating bolt. Detailed Implementation
[0031] Before explaining any implementation of this application in detail, it should be understood that this application is not limited to its application to the structural details and component arrangements set forth in the following description or shown in the above drawings.
[0032] In this application, the terms "comprising," "including," "having," 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 limitation, 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 that element.
[0033] In this application, the terms "connection," "combination," "coupling," and "installation" can refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, a direct connection refers to two parts or components being connected together without the need for an intermediary, while an indirect connection refers to two parts or components each being connected to at least one intermediary, with the connection achieved through the intermediary. Furthermore, "connection" and "coupling" are not limited to physical or mechanical connections or couplings, but can also include electrical connections or couplings.
[0034] In this application, those skilled in the art will understand that the function performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one component, or a combination of multiple parts.
[0035] In this application, the directional terms "upper," "lower," "left," "right," "front," and "rear" are used to describe the orientation and positional relationships shown in the accompanying drawings and should not be construed as limiting the embodiments of this application. Furthermore, in the context, it should be understood that when an element is mentioned as being connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected through an intermediate element. It should also be understood that directional terms such as upper side, lower side, left side, right side, front side, and rear side not only represent positive orientation but can also be understood as lateral orientation. For example, "below" can include directly below, lower left, lower right, lower front, and lower rear.
[0036] In designing and manufacturing gear transmission systems, in order to effectively support the input gear, ensure stable meshing between the input gear and the idler gear, and guarantee the positioning accuracy of the idler gear shaft, such as... Figures 1-5 As shown, this utility model provides a gear transmission system. The gear transmission system includes a gearbox housing 1, an input transmission assembly 2, an idler gear assembly 3, a first-stage output assembly 4, and a planetary output assembly 5.
[0037] The gearbox housing 1 has a hollow mounting cavity. The input transmission assembly 2 is disposed within the mounting cavity and includes an input shaft 21 and an input gear 22. Both ends of the input shaft 21 are mounted on the gearbox housing 1, and the input shaft 21 is rotatable relative to the gearbox housing 1. The input gear 22 is fixedly sleeved on the input shaft 21. An idler gear assembly 3 is disposed within the mounting cavity and includes an idler gear shaft 31 and an idler gear body 32. The idler gear shaft 31 is fixedly mounted on the gearbox housing 1, and the idler gear body 32 is rotatably sleeved on the idler gear shaft 31 and meshes with the input gear 22. A first-stage output assembly 4 is rotatably disposed within the gearbox housing 1 and is drive-connected to the idler gear assembly 3. A planetary output assembly 5 is partially disposed within the gearbox housing 1 and is drive-connected to the first-stage output assembly 4, serving as the power output component.
[0038] Since the input gear 22 is mounted on the input shaft 21, and both ends of the input shaft 21 are supported by the gearbox housing 1, the input gear 22 can be effectively supported. This ensures that the center distance between the input gear 22 and the idler gear body 32 meets the requirements, enabling stable meshing, reducing meshing noise, and extending the service life of the input gear 22. Moreover, since the idler gear shaft 31 is fixedly mounted on the gearbox housing 1, the positioning accuracy of the idler gear shaft 31 can be guaranteed.
[0039] In some embodiments, rolling bearings 23 are fixedly disposed at both ends of the input shaft 21, and the outer rings of the rolling bearings 23 are fixedly disposed on the gearbox housing 1. By providing the rolling bearings 23, the smooth rotation of the input shaft 21 can be ensured, thereby ensuring that the input shaft 21 drives the input gear 22 to rotate. In this embodiment, the input shaft 21 can be connected to the motor shaft of the motor, thereby enabling the motor to drive the input shaft 21 to rotate.
[0040] In some embodiments, a corrugated washer 24 is provided between one of the rolling bearings 23 and the gearbox housing 1. By providing the corrugated washer 24, the axial clearance of the rolling bearing 23 can be eliminated, and the noise of the rolling bearing 23 can be reduced.
[0041] In some embodiments, a needle roller bearing 34 is fixedly sleeved on the idler shaft 31, and the idler body 32 is fixedly sleeved on the needle roller bearing 34. By providing the needle roller bearing 34, it is possible to ensure that the idler body 32 rotates stably relative to the idler shaft 31, and it is also possible to reduce friction and ensure that the idler body 32 rotates smoothly.
[0042] In some embodiments, a self-lubricating washer 33 is fitted onto the idler shaft 31, and the self-lubricating washer 33 is located between the idler body 32 and the gearbox housing 1. By providing the self-lubricating washer 33, noise caused by metal-to-metal friction between the idler body 32 and the gearbox housing 1 can be prevented, and the self-lubricating washer 33 can also withstand a certain axial load. In this embodiment, the self-lubricating washer 33 is made of polytetrafluoroethylene.
[0043] In some embodiments, the primary output assembly 4 includes an output gear 42 and an output shaft 41. The output shaft 41 is rotatably disposed in the gearbox housing 1, and the output gear 42 is fixedly sleeved on the output shaft 41, meshing with the idler gear body 32. Specifically, one end of the output shaft 41 is mounted on the gearbox housing 1 via a bearing. After the input shaft 21 rotates, the input gear 22 drives the idler gear body 32, which meshes with the output gear 42, thereby causing the output gear 42 to rotate. The output gear 42 then drives the output shaft 41 to rotate, achieving primary power output.
[0044] In some embodiments, the input gear 22, the idler gear body 32, and the output gear 42 are all helical gears, which can further ensure the stability of the transmission.
[0045] In some embodiments, the planetary output assembly 5 includes a sun gear 51, planet gears 52, a planet carrier 54, and an internal gear ring 53. The sun gear 51 is fixedly mounted on the output shaft 41, the internal gear ring 53 is fixedly mounted in the gearbox housing 1, and the planet gears 52 are rotatably mounted on the planet carrier 54, meshing with the internal gear ring 53 and the sun gear 51. During the rotation of the output shaft 41, the sun gear 51 rotates, thereby driving the planet gears 52 to rotate between the sun gear 51 and the internal gear ring 53. The planet gears 52 achieve power output through the planet carrier 54.
[0046] In the prior art, due to the compact space of the gearbox housing 1, the internal gear ring 53 and the gearbox housing 1 are generally fitted with interference fit or axial riveting. However, after fitting or riveting, the aluminum alloy gearbox housing 1 is prone to deformation, affecting the meshing clearance between the planetary gear 52 and the internal gear ring 53, and increasing the noise of the meshing transmission. To solve the above problems, in some embodiments, multiple positioning grooves 531 are spaced apart on the internal gear ring 53 along the axial direction of the internal gear ring 53. Multiple positioning bolts 6 are arranged one-to-one with the multiple positioning grooves 531, and the positioning bolts 6 pass through the positioning grooves 531 and connect to the gearbox housing 1. Specifically, in this embodiment, the outer circle of the internal gear ring 53 and the gearbox housing 1 are transitionally fitted, and three positioning grooves 531 are equally spaced along the outer edge of the internal gear ring 53. The positioning grooves 531 are evenly distributed at 120°. The internal gear ring 53 is fitted with the smooth surface of the positioning bolts 6 through the positioning grooves 531 to prevent the internal gear ring 53 from rotating and moving axially. This solution significantly reduces the installation stress of the internal gear ring 53, minimizes the deformation of the gearbox housing 1, and ensures the meshing clearance between the planetary gear 52 and the internal gear ring 53.
[0047] In some embodiments, a planetary flange bushing 11 is provided on the gearbox housing 1, one end of the planet carrier 54 extends relative to the planetary flange bushing 11, and an elastic pad 12 is fixedly provided on the flange surface of the planetary flange bushing 11 facing the planet carrier 54. With this arrangement, the axial installation clearance of the planetary gears 52 can be eliminated using the elastic pad 12, resulting in a certain amount of compression between the planet carrier 54 and the planetary flange bushing 11 after installation. In this embodiment, the elastic pad 12 is made of silicone or rubber.
[0048] In some embodiments, the elastic gasket 12 and the planetary flange bushing 11 are vulcanized into an integrated structure. The vulcanization process ensures a stable connection between the elastic gasket 12 and the planetary flange bushing 11. To further enhance the stability of the connection between the elastic gasket 12 and the planetary flange bushing 11, an annular groove is formed on the flange surface of the planetary flange bushing 11. After the elastic gasket 12 and the planetary flange bushing 11 are integrally formed, the bonding strength is further improved.
[0049] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.
Claims
1. A gear transmission system, characterized in that, include: Gearbox housing (1), the gearbox housing (1) having a hollow mounting cavity; An input transmission assembly (2) is disposed in the mounting cavity and includes an input shaft (21) and an input gear (22). The two ends of the input shaft (21) are disposed on the gearbox housing (1) and the input shaft (21) is rotatable relative to the gearbox housing (1). The input gear (22) is fixedly sleeved on the input shaft (21). An idler assembly (3) is disposed in the mounting cavity and includes an idler shaft (31) and an idler body (32). The idler shaft (31) is fixedly disposed on the gearbox housing (1), and the idler body (32) is rotatably sleeved on the idler shaft (31). The idler body (32) meshes with the input gear (22). A primary output component (4) is rotatably disposed in the gearbox housing (1) and is connected to the idler wheel assembly (3) in a transmission manner; Planetary output assembly (5), part of which is disposed in the gearbox housing (1), and is connected to the first-stage output assembly (4) for power output.
2. The gear transmission system according to claim 1, characterized in that, Both ends of the input shaft (21) are fixedly provided with rolling bearings (23), and the outer ring of the rolling bearings (23) is fixedly provided on the gearbox housing (1).
3. The gear transmission system according to claim 2, characterized in that, A wave-shaped washer (24) is sandwiched between one of the rolling bearings (23) and the gearbox housing (1).
4. The gear transmission system according to claim 1, characterized in that, The idler shaft (31) is fixedly fitted with a needle roller bearing (34), and the idler body (32) is fixedly fitted on the needle roller bearing (34).
5. The gear transmission system according to claim 4, characterized in that, A self-lubricating washer (33) is fitted on the idler shaft (31), and the self-lubricating washer (33) is located between the idler body (32) and the gearbox housing (1).
6. The gear transmission system according to claim 1, characterized in that, The first-stage output component (4) includes an output gear (42) and an output shaft (41). The output shaft (41) is rotatably disposed in the gearbox housing (1). The output gear (42) is fixedly sleeved on the output shaft (41) and meshes with the idler gear body (32).
7. The gear transmission system according to claim 6, characterized in that, The planetary output assembly (5) includes a sun gear (51), planet gears (52), a planet carrier (54), and an internal gear ring (53). The sun gear (51) is fixedly mounted on the output shaft (41), the internal gear ring (53) is fixedly mounted in the gearbox housing (1), and the planet gears (52) are rotatably mounted on the planet carrier (54). The planet gears (52) mesh with the internal gear ring (53) and the sun gear (51).
8. The gear transmission system according to claim 7, characterized in that, Multiple positioning grooves (531) are spaced apart on the internal gear ring (53) along the axial direction of the internal gear ring (53). Multiple positioning bolts (6) are arranged in a one-to-one correspondence with the multiple positioning grooves (531). The positioning bolts (6) pass through the positioning grooves (531) and are connected to the gearbox housing (1).
9. The gear transmission system according to claim 7, characterized in that, A planetary flange bushing (11) is provided on the gearbox housing (1). One end of the planet carrier (54) extends out relative to the planetary flange bushing (11). An elastic pad (12) is fixedly provided on the flange surface of the planetary flange bushing (11) facing the planet carrier (54).
10. The gear transmission system according to claim 9, characterized in that, The elastic pad (12) and the planetary flange bushing (11) are vulcanized into an integrated structure.