Electric gear box

Abstract

The utility model discloses an electric gear box, include: gear box body and built -in motor in gear box body, wherein gear box body includes the casing and shell cover suitable for cooperation formation for accommodating the cavity of motor, the cavity includes the lower accommodating cavity of shaping in casing and the upper accommodating cavity of shaping in shell cover, and is equipped with the elastic link between motor and lower accommodating cavity and / or upper accommodating cavity, when shell cover and casing are connected in place, and the motor is accommodated in the cavity and the elastic link is extruded and deforms along the direction perpendicular to the motor axial direction, to make the cavity produce the pre -tightening force to motor.

Description

Technical Field

[0001] This utility model relates to the field of gearbox technology, and in particular to an electric gearbox. Background Technology

[0002] An electric gearbox includes a housing, a cover, a motor, and a gear set; the motor and gear set are located within the space formed by the housing and the cover. In one existing technology, screws are used to fix the motor to a raised mounting wall of the housing. This screw-fixing method lacks other restraints on the motor. During production and assembly, the screws are prone to misalignment or damage to the housing, resulting in an unstable motor fixation. Furthermore, screws driving into the motor can affect the motor's sealing, and misaligned screws can amplify motor vibrations during operation. Additionally, the tightening of screws between the motor and the gearbox can generate metal shavings, which can cause noise if they enter the motor. Moreover, in screw-fixing methods, the part fixed to the motor is often a raised mounting wall, which acts like a cantilever beam after the motor is fixed. If the mounting wall is too thin, the structural strength is insufficient, and the mounting wall is prone to breakage or damage by the screws.

[0003] To address the aforementioned issues, for example, CN214248161U discloses a motor assembly, gearbox, and electrical components, in which the motor is fixed within the gearbox housing by a mounting bracket. While this structure avoids the problem of insufficient motor limiting effect, it requires a mounting bracket that precisely matches the motor's dimensions. In other words, the forming accuracy of the mounting bracket directly affects its motor limiting effect, thus increasing the overall manufacturing difficulty. Based on this, CN222542218U discloses an electric operating mechanism, in which the motor is directly limited by the cooperation of the housing and cover, eliminating the need for a mounting bracket and simplifying the structure. However, this method struggles to ensure reliable motor limiting. When the motor cannot be reliably limited within the housing, it may increase operating noise during use.

[0004] Therefore, in view of the various problems existing in the motor limiting situation in the existing electric gearbox, it is necessary to further optimize its overall structure while taking into account both the limiting effect and the reduction of processing difficulty. Utility Model Content

[0005] The purpose of this invention is to provide an electric gearbox that solves the technical problem of balancing the limiting effect and reducing the difficulty of processing.

[0006] The electric gearbox of this utility model is implemented as follows:

[0007] An electric gearbox includes at least: a gearbox body and a motor built into the gearbox body; wherein

[0008] The gearbox housing includes a housing and a cover adapted for fastening to form a cavity for housing an electric motor; the cavity includes a lower receiving cavity formed in the housing and an upper receiving cavity formed in the cover;

[0009] An elastic connecting member is provided between the motor and the lower accommodating cavity and / or the upper accommodating cavity;

[0010] When the cover is fitted into the housing, the motor is housed in the cavity and the elastic connector is compressed and deformed in a direction perpendicular to the motor axis, so that the cavity generates a pre-tightening force on the motor.

[0011] In an optional embodiment of this utility model, an elastic connecting member is provided between the motor and the upper accommodating cavity.

[0012] In an optional embodiment of this utility model, the elastic connector is a structure made of elastic material that conformally fits the outer wall of the motor body facing the upper receiving cavity.

[0013] In an optional embodiment of this utility model, at least two ribs are provided at intervals on the top wall surface of the upper accommodating cavity facing the lower accommodating cavity, each extending in a direction parallel to the motor axis.

[0014] In an optional embodiment of this utility model, each of the ribs is integrally formed with the shell cover, and each of the ribs is adapted to simultaneously generate a micro-compression effect on the elastic connector and the motor.

[0015] In an optional embodiment of this utility model, at least two reinforcing ribs are respectively provided on a pair of sidewalls located on both sides of the top wall in the upper accommodating cavity, and each of the reinforcing ribs is adapted to connect with the outer sidewall of the main body of the motor.

[0016] In an optional embodiment of this invention, the lower accommodating cavity is provided with a support assembly for supporting the motor from the bottom and limiting a pair of axial end faces of the motor's main body; and

[0017] The upper accommodating cavity is provided with a pressing component for pressing the motor from the top and limiting a pair of shaft-side end faces of the motor body.

[0018] In an optional embodiment of this invention, the support assembly includes a first support portion and a second support portion arranged at intervals along the axial direction of the motor; wherein

[0019] The first support portion is used to adapt to the small cylindrical surface at the front end of the motor, and the second support portion is used to adapt to the small cylindrical surface at the rear end of the motor; and

[0020] The side wall of the first support portion facing the second support portion forms a first support surface suitable for contacting one axial end of the main body of the motor;

[0021] The side wall of the second support portion facing the first support portion forms a second support surface suitable for contacting the other axial end of the main body portion of the motor.

[0022] In an optional embodiment of this invention, the pressing assembly includes a first limiting portion and a second limiting portion arranged at intervals along the axial direction of the motor; wherein

[0023] The first limiting part is used to adapt to the small cylindrical surface at the front end of the supporting motor;

[0024] The side wall surface of the first limiting part facing the second limiting part forms a first limiting surface suitable for contacting one shaft-side end of the main body of the motor;

[0025] The side wall of the second limiting part facing the first limiting part forms a second limiting surface suitable for contacting the other shaft end of the main body of the motor.

[0026] In an optional embodiment of this utility model, at least two contact ribs adapted to abut against the main body of the motor are provided at intervals on the second limiting surface.

[0027] By adopting the above technical solution, this utility model has the following beneficial effects: The electric gearbox of this utility model forms a space for accommodating the motor through a lower accommodating cavity formed in the housing and an upper accommodating cavity formed in the cover. Based on this, the motor is reliably fixed in the gearbox cavity by the tight fit between the housing and the cover. Furthermore, the designed elastic connector, which deforms under pressure as the housing and cover are tightly fitted, applies a pre-tightening force to the motor, preventing vibration after long-term use. The design of the elastic connector also reduces the precision requirements for the machining of the housing and cover, compensating for machining errors through the deformation of the elastic connector. This reduces the machining difficulty of the housing and cover, preventing noise caused by insufficient machining precision leading to a gap between the motor and the cavity. Attached Figure Description

[0028] Figure 1 This is a partial first-view exploded structural diagram of the electric gearbox of this utility model;

[0029] Figure 2 This is a partial exploded view of the electric gearbox of this utility model.

[0030] Figure 3 This is a schematic diagram of the motor structure used in the electric gearbox of this utility model;

[0031] Figure 4This is a schematic diagram of the mating structure of the motor, housing, and cover of the electric gearbox of this utility model.

[0032] Figure 5 This is a schematic diagram of the shell cover used in the electric gearbox of this utility model;

[0033] Figure 6 for Figure 5 Enlarged schematic diagram of part A;

[0034] Figure 7 This is a schematic diagram of the housing structure used in the electric gearbox of this utility model.

[0035] In the figure: shell 11, shell cover 12, upper accommodating cavity 13, lower accommodating cavity 14, main body 21, front small cylindrical surface 22, rear small cylindrical surface 23, motor shaft 24, first support part 31, second support part 32, first support surface 33, second support surface 34, first limiting part 41, second limiting part 42, first limiting surface 43, second limiting surface 44, contact rib 45, elastic connecting piece 5, protruding rib 6, reinforcing rib 7. Detailed Implementation

[0036] To make the contents of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0037] Example 1:

[0038] Please see Figures 1 to 7 As shown, this embodiment provides an electric gearbox, comprising at least: a gearbox body and a motor built into the gearbox body; wherein the gearbox body includes a housing 11 and a cover 12 adapted for fastening together to form a cavity for accommodating the motor; the cavity includes a lower accommodating cavity 14 formed in the housing 11 and an upper accommodating cavity 13 formed in the cover 12. It should be noted that the electric gearbox in this embodiment also includes a transmission gear set and circuit board used in mature structures that cooperate with the motor, and their structure is not absolutely limited in this embodiment. It should also be noted that, considering the general concept of gearbox placement, the housing 11 is usually considered to be below and the cover 12 above; therefore, in the following embodiments, the concepts of "bottom" and "top" are also defined based on the orientation of the housing 11 below and the cover 12 above.

[0039] It should be noted that, in the first alternative embodiment, the housing 11 and the cover 12 are adapted to be welded together. In the second alternative embodiment, the housing 11 and the cover 12 are adapted to be fastened together by a plurality of fasteners, such as, but not limited to, screws.

[0040] Regarding the materials of the housing 11 and the cover 12 in this embodiment, theoretically either metal or plastic can be chosen. However, from the perspective of reducing costs and the weight of the electric gearbox, plastic has a wider range of applications.

[0041] In order to reliably house the motor in the cavity, the lower accommodating cavity 14 in this embodiment is provided with a support assembly for supporting the motor from the bottom and limiting a pair of axial end faces of the main body 21 of the motor; and the upper accommodating cavity 13 is provided with a pressing assembly for pressing the motor from the top and limiting a pair of axial end faces of the main body 21 of the motor.

[0042] Based on the above structure, it should be noted that the overall shapes of the upper accommodating cavity 13 and the lower accommodating cavity 14 are designed in conjunction with the specific shape of the motor to be accommodated, so that the cavity can better fit the shape of the motor. In this embodiment, referring to the accompanying drawings, an example of a motor is given. The motor includes a main body 21 formed by the cooperation of a stator structure and a rotor structure, a front small cylindrical surface 22 designed on one axial end of the main body 21, and a rear small cylindrical surface 23 designed on the other axial end of the main body 21. The motor shaft 24 passes through the front small cylindrical surface 22.

[0043] Furthermore, regarding the motor described above, the support assembly firstly includes a first support portion 31 and a second support portion 32 arranged axially spaced along the motor. The first support portion 31 is used to adapt and support the front small cylindrical surface 22 of the motor, and the second support portion 32 is used to adapt and support the rear small cylindrical surface 23 of the motor. Both the first support portion 31 and the second support portion 32 have arc-shaped contact surfaces, and the axes of these arc-shaped contact surfaces are collinear, ensuring the horizontality of the motor relative to the housing 11 and the cover 12 after installation. Moreover, the sidewall of the first support portion 31 facing the second support portion 32 forms a first support surface 33 suitable for contacting one axial end of the motor body 21; the sidewall of the second support portion 32 facing the first support portion 31 forms a second support surface 34 suitable for contacting the other axial end of the motor body 21.

[0044] Secondly, the pressing assembly includes a first limiting part 41 and a second limiting part 42 arranged at intervals along the axial direction of the motor; wherein the first limiting part 41 is used to adapt to support the small cylindrical surface 22 at the front end of the motor; the side wall surface of the first limiting part 41 facing the second limiting part 42 forms a first limiting surface 43 suitable for contacting one axial end of the main body 21 of the motor; the side wall surface of the second limiting part 42 facing the first limiting part 41 forms a second limiting surface 44 suitable for contacting the other axial end of the main body 21 of the motor.

[0045] Based on the above structure, in an optional embodiment, the second limiting surface 44, in addition to meeting the abutment requirement of one axial end face of the motor body 21, may also have at least two contact ribs 45 protruding at intervals on the second limiting surface 44, suitable for abutting against the motor body 21. The specific extension direction of the contact ribs 45 on the second limiting surface 44 is not absolutely limited in this embodiment; the accompanying drawings only illustrate the case where they are approximately perpendicular to the lower accommodating cavity 14. The design of the contact ribs 45 reduces the actual contact area between the second limiting surface 44 and the motor body 21. Considering the widely used plastic housing 11 and cover 12, where the second limiting member is integrally formed in the cover 12, the contact ribs 45 can undergo slight deformation when abutting against one axial end face of the motor body 21, thus providing a slight pre-tightening force in the axial dimension of the motor. During this process, the contact rib 45 is more likely to undergo slight deformation than the second limiting surface 44 is to undergo overall deformation. Therefore, the contact rib 45 is designed in this embodiment.

[0046] Next, it is important to note that this embodiment also provides an elastic connecting member 5 between the motor and the lower accommodating cavity 14 and / or the upper accommodating cavity 13. Based on this structure, when the cover 12 and the housing 11 are fitted into place, the motor is housed in the cavity and the elastic connecting member 5 is compressed and deformed in a direction perpendicular to the motor axis, so that the cavity generates a pre-tightening force on the motor.

[0047] Based on the above, and considering the need for structural simplification, this embodiment provides an elastic connector 5 only between the motor and the upper accommodating cavity 13. The elastic connector 5 is a structure made of elastic material that conforms to the outer wall of the motor body 21 facing the upper accommodating cavity 13. When the outer wall of the motor body 21 facing the upper accommodating cavity 13 is an arc-shaped surface, the elastic connector 5 is also an arc-shaped structure. When the outer wall of the motor body 21 facing the upper accommodating cavity 13 is a flat surface, the elastic connector 5 is also a flat plate structure. Here, the shape of the elastic connector 5 is designed to conform to the outer wall of the motor body 21 facing the upper receiving cavity 13. On the one hand, this is to facilitate the assembly of the electric gearbox in this embodiment. In this case, the elastic connector 5 can be directly fixed to the motor body 21 by adhesive. Thus, for the motor housed in the cavity, the elastic connector 5 is reliably fixed. When the cover 12 is assembled with the housing 11, the elastic connector 5 will not shift due to contact. On the other hand, in this case, the elastic connector 5 is subjected to more balanced squeezing forces from the motor body 21 and the upper receiving cavity 13 when the cover 12 is assembled with the housing 11, thereby making its deformation effect more reliable and stable.

[0048] Regarding the elastic connector 5, it is also necessary to explain that its design can reduce the machining accuracy requirements of the housing 11 and the cover 12. The deformation of the elastic connector 5 compensates for machining errors, thereby reducing the machining difficulty of the housing 11 and the cover 12 and preventing noise caused by insufficient machining accuracy of the housing 11 and the cover 12, which could result in a gap between the motor and the cavity. In this regard, the thickness of the elastic connector 5 is not absolutely limited in this embodiment. Considering the possible differences in machining errors of the housing 11 and the cover 12, the thickness of the elastic connector 5 can be adjusted adaptively. By selecting an elastic connector 5 with an appropriate thickness, the deformation capacity can be better ensured that the motor is reliably confined within the gearbox cavity.

[0049] In summary, for the electric gearbox of this embodiment, the assembly and fixing process of the motor is not only simple, but also the requirements for the processing accuracy of the product are reduced, thereby reducing the processing difficulty.

[0050] Example 2:

[0051] Please see Figures 1 to 7 As shown, based on the electric gearbox of Embodiment 1, and considering the case where an elastic connecting member 5 is designed between the motor and the upper accommodating cavity 13, the electric gearbox provided in this embodiment has at least two ribs 6 spaced apart on the top wall surface of the upper accommodating cavity 13 facing the lower accommodating cavity 14, which extend in a direction parallel to the motor axis.

[0052] Based on the above, furthermore, each rib 6 is integrally formed with the cover 12, and each rib 6 is suitable for simultaneously generating a micro-compression effect on the elastic connector 5 and the motor. Regarding the rib 6 here, its cross-section along the direction perpendicular to the motor axis can be arc-shaped. For at least three spaced ribs 6, the overall cross-section along the direction perpendicular to the motor axis can be at least W-shaped.

[0053] In this embodiment, the design of the rib 6 reduces the area of ​​the force point that actually acts on the main body 21 of the motor by the top wall of the upper accommodating cavity 13. This reduces the vibration between the motor and the cover 12 during operation while ensuring that the main body 21 of the motor is reliably pressed through the elastic connector 5.

[0054] In an alternative embodiment, at least two reinforcing ribs 7 are provided at intervals on a pair of sidewalls located on both sides of the top wall of the upper accommodating cavity 13. Each reinforcing rib 7 is adapted to connect with the outer sidewall of the motor body 21. The reinforcing ribs 7 here increase the strength of the cover 12 while reducing the contact area between the sidewall of the upper accommodating cavity 13 and the motor body 21, which can also reduce the vibration between the motor and the cover 12 during operation.

[0055] The above specific embodiments further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above are only specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

[0056] In the description of this utility model, it should be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0057] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0058] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0059] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply 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 tilted.

[0060] In this invention, unless otherwise expressly specified and limited, "above or below" the first feature may include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on" the first feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the first feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

Claims

1. An electric gearbox, characterized in that, At least including: The gearbox housing and the motor built into the gearbox housing; among which The gearbox housing includes a housing and a cover adapted for fastening to form a cavity for housing an electric motor; the cavity includes a lower receiving cavity formed in the housing and an upper receiving cavity formed in the cover; An elastic connecting member is provided between the motor and the lower accommodating cavity and / or the upper accommodating cavity; When the cover is fitted into the housing, the motor is housed in the cavity and the elastic connector is compressed and deformed in a direction perpendicular to the motor axis, so that the cavity generates a pre-tightening force on the motor.

2. The electric gearbox according to claim 1, characterized in that, An elastic connector is provided between the motor and the upper accommodating cavity.

3. The electric gearbox according to claim 2, characterized in that, The elastic connector is a structure made of elastic material that conforms to the outer wall of the upper accommodating cavity of the motor body.

4. The electric gearbox according to claim 2 or 3, characterized in that, At least two ribs are provided at intervals on the top wall surface of the upper accommodating cavity facing the lower accommodating cavity, each extending in a direction parallel to the motor axis.

5. The electric gearbox according to claim 4, characterized in that, Each of the aforementioned ribs is integrally formed with the shell cover, and each of the aforementioned ribs is adapted to simultaneously generate a micro-compression effect on the elastic connector and the motor.

6. The electric gearbox according to claim 4, characterized in that, At least two reinforcing ribs are provided at intervals on a pair of sidewalls located on both sides of the top wall in the upper accommodating cavity, and each reinforcing rib is adapted to connect with the outer sidewall of the main body of the motor.

7. The electric gearbox according to claim 1, characterized in that, The lower accommodating cavity is provided with a support assembly for supporting the motor from the bottom and limiting the position of a pair of axial end faces of the motor's main body; and The upper accommodating cavity is provided with a pressing component for pressing the motor from the top and limiting a pair of shaft-side end faces of the motor body.

8. The electric gearbox according to claim 7, characterized in that, The support assembly includes a first support portion and a second support portion arranged at intervals along the axial direction of the motor; wherein The first support part is used to adapt to the front small cylindrical surface of the motor, and the second support part is used to adapt to the rear small cylindrical surface of the motor. as well as The side wall of the first support portion facing the second support portion forms a first support surface suitable for contacting one axial end of the main body of the motor; The side wall of the second support portion facing the first support portion forms a second support surface suitable for contacting the other axial end of the main body portion of the motor.

9. The electric gearbox according to claim 7 or 8, characterized in that, The pressing assembly includes a first limiting part and a second limiting part arranged at intervals along the axial direction of the motor; wherein The first limiting part is used to adapt to the small cylindrical surface at the front end of the supporting motor; The side wall surface of the first limiting part facing the second limiting part forms a first limiting surface suitable for contacting one shaft-side end of the main body of the motor; The side wall of the second limiting part facing the first limiting part forms a second limiting surface suitable for contacting the other shaft end of the main body of the motor.

10. The electric gearbox according to claim 9, characterized in that, The second limiting surface is provided with at least two contact ribs at intervals, which are suitable for abutting against the main body of the motor.

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