Transmission gearboxes and power tools

Abstract

This application discloses a transmission gearbox and a power tool. The transmission gearbox includes a gearbox housing, a gear transmission module, and an intermediate section. The gearbox housing includes a first gearbox housing and a second gearbox housing. The gear transmission module includes a first gear reduction assembly housed in the first gearbox housing and a second gear reduction assembly housed in the second gearbox housing. The first gear reduction assembly drives the second gear reduction assembly for output. The first gear reduction assembly includes a transmission internal gear ring. The intermediate section axially separates the first gear reduction assembly and the second gear reduction assembly. The intermediate section includes an anti-rotation part integrally formed with the gearbox housing and a support part at least partially integrally formed with the gearbox housing. The transmission internal gear ring is axially moved to engage or disengage from the anti-rotation part to switch the speed of the first gear reduction assembly. The support part supports the second gear reduction assembly to prevent the axial force of the second gear reduction assembly from being transmitted to the anti-rotation part. The support part is located at the end of the first gearbox housing and is disposed opposite to the second gearbox housing. The anti-rotation part has multiple stop teeth and multiple matching grooves located between adjacent stop teeth in the circumferential direction. The central angle of adjacent matching grooves is less than or equal to 30°.

Description

Technical Field

[0001] This application relates to the field of power tools, and more particularly to transmission gearboxes and power tools. Background Technology

[0002] Existing power tools offer two speed settings (high and low) to adapt to different needs. For example, a drill can selectively perform different functions, such as a drill or a screwdriver. The drill mode has a fixed torque for drilling, while the screwdriver mode has adjustable torque. Notably, both high and low speeds are adjustable for different output functions. The drill includes a drive assembly, transmission gearbox, drive shaft, working head, circuit board, housing, and power supply. Powered by the power supply, the drive assembly is controlled and driven. The transmission gearbox connects the motor and drive shaft, allowing the drive shaft to transmit power at adjustable speed to the output shaft, which then drives the working head. It's worth mentioning that when the drill is in low-speed mode, the transmission gearbox includes an axially movable speed-adjustable internal gear ring and a stop. The speed-adjustable internal gear ring is stopped by the stop, and the transmission gearbox outputs power at low speed. The existing speed-regulating internal gear ring stop has several problems. First, the current stop is located only in the axial direction, increasing the axial length and thus the overall axial dimension of the machine, which is detrimental to compact design. Second, it increases costs by requiring more material and assembly space, raising manufacturing costs. Furthermore, the stop has 3 to 4 protrusions to prevent the speed-regulating internal gear ring from moving, resulting in insufficient force distribution. This makes the fit between the speed-regulating internal gear ring and the stop prone to localized deformation or premature fatigue damage during use, affecting its lifespan. During high-frequency switching or heavy-load operation, slippage or wear may occur. Summary of the Invention

[0003] One object of the present invention is to provide a transmission gearbox and a power tool, wherein the power tool includes a high-speed mode and a low-speed mode, and when the power tool is adjusted to the low-speed mode, the transmission gearbox includes a movable speed-regulating internal gear ring and a middle portion, the middle portion of the transmission gearbox engaging with the radially driven speed-regulating internal gear ring with a distributed stop tooth to prevent the speed-regulating internal gear ring from rotating radially.

[0004] Another object of the present invention is a transmission gearbox and a power tool, wherein the power tool includes a high-speed mode and a low-speed mode, and when the power tool is adjusted to the low-speed mode, the transmission gearbox includes an axially movable speed-regulating internal gear ring and an intermediate portion, wherein a limiting ring of the intermediate portion limits the speed-regulating internal gear ring driven forward to prevent axial movement of the speed-regulating internal gear ring.

[0005] Another object of the present invention is a transmission gearbox and a power tool, wherein the power tool is adjusted to a high mode, the transmission gearbox includes an axially movable speed-regulating internal gear ring and a middle portion, the speed-regulating internal gear ring being driven rearward, the speed-regulating internal gear ring and the middle portion disengaging, the middle portion including a radially uniformly distributed stop tooth extending axially, and the length of the stop tooth being less than or equal to the tooth depth of the speed-regulating internal gear ring.

[0006] Another object of the present invention is a transmission gearbox and a power tool, wherein the transmission gearbox includes: a gearbox housing, a gear transmission module, and an intermediate section. The gearbox housing includes a first gearbox housing and a second gearbox housing. The gear transmission module includes a first gear reduction assembly housed in the first gearbox housing and a second gear reduction assembly housed in the second gearbox housing. The first gear reduction assembly drives the second gear reduction assembly to output power. The first gear reduction assembly includes a transmission internal gear ring. The intermediate section axially separates the first gear reduction assembly and the second gear reduction assembly. The intermediate section includes an anti-rotation part integrally formed with the gearbox housing and a support part at least partially integrally formed with the gearbox housing. The transmission internal gear ring is axially moved to engage or disengage from the anti-rotation part to switch the speed of the first gear reduction assembly. The support part supports the second gear reduction assembly to prevent the axial force of the second gear reduction assembly from being transmitted to the anti-rotation part.

[0007] Other advantages and features of this application will be fully apparent from the following detailed description and can be achieved through the combination of the handpiece and device specifically indicated in the accompanying drawings.

[0008] According to one aspect of this application, which is capable of achieving the foregoing and other objectives and advantages, this application provides a transmission gearbox comprising:

[0009] A gearbox housing, comprising a first gearbox housing and a second gearbox housing;

[0010] A gear transmission module includes a first gear reduction assembly housed within a first gearbox housing and a second gear reduction assembly housed within a second gearbox housing. The first gear reduction assembly drives the second gear reduction assembly for output. The first gear reduction assembly includes an internal gear ring.

[0011] The intermediate section axially separates the first gear reduction assembly and the second gear reduction assembly. The intermediate section includes an anti-rotation part integrally formed with the gearbox housing and a support part at least partially integrally formed with the gearbox housing. The internal gear ring is axially moved to engage or disengage from the anti-rotation part to switch the speed of the first gear reduction assembly. The support part supports the second gear reduction assembly to prevent the axial force of the second gear reduction assembly from being transmitted to the anti-rotation part. Wherein:

[0012] The support is located at the end of the first gearbox housing and is disposed opposite to the second gearbox housing. The anti-rotation part has multiple stop teeth and multiple matching grooves located between adjacent stop teeth in the circumferential direction, and the central angle between adjacent matching grooves is less than or equal to 30°.

[0013] Preferably, the stop teeth are radially and evenly distributed, extend axially, and the length of the stop teeth is less than or equal to the tooth depth of the speed regulating internal gear ring.

[0014] In some embodiments, the support is integrally formed at the end of the second gearbox housing and is held between the first gearbox housing and the second gearbox housing.

[0015] In some embodiments, the first support portion includes a retaining ring, a plurality of lugs, and a plurality of locking clearance grooves, wherein the lugs protrude radially from the retaining ring, and the retaining ring can be fitted onto a first gear reduction assembly and / or a second gear reduction assembly, wherein:

[0016] Each lug defines at least one locking clearance groove to form a concave shape that radially protrudes from the retaining ring; or

[0017] Two adjacent lugs define at least one locking clearance groove to form a concave shape that protrudes radially from the retaining ring.

[0018] In some embodiments, the first support includes a retaining ring and a plurality of lugs, the lugs being radially protruding from the retaining ring, the retaining ring being fitted onto a first gear reduction assembly and / or a second gear reduction assembly, the lugs being evenly distributed, wherein the number of lugs is 3, 4 or more.

[0019] In some embodiments, the support portion includes a first support portion and a second support portion, wherein the first support portion is integrally formed on the end of the second gearbox housing and is clamped by the first gearbox housing and the second gearbox housing, and the second support portion is clamped between the first support portion and the second gearbox housing.

[0020] In some embodiments, the support portion includes a first support portion integrally formed on the end of the first gearbox housing and a second support portion disposed between the first support portion and the second gearbox housing. The second support portion is a metal sheet, and the shape of the second support portion is consistent with the shape of the first support portion. The first support portion is made of plastic.

[0021] In some embodiments, the second support includes a second retaining ring, a plurality of second lugs, and a plurality of second locking clearance grooves. The second lugs protrude radially from the second retaining ring. The second retaining ring can be fitted onto the first gear reduction assembly and / or the second gear reduction assembly, wherein:

[0022] Each second lug defines at least one second locking clearance groove to form a concave shape that radially protrudes from the retaining ring; or

[0023] Two adjacent second lugs define at least one second locking clearance groove to form a concave shape that radially protrudes from the retaining ring.

[0024] In some embodiments, the middle portion includes a second support portion, the second support portion including a second retaining ring and a plurality of second lugs, the second lugs being radially protruding from the second retaining ring and being evenly distributed, wherein the number of second lugs is 3, 4 or more.

[0025] In some embodiments, the second support portion has a plurality of second locking clearance slots, one of which of the locking portions is embedded in a corresponding second locking clearance slot, wherein:

[0026] Each second lug is surrounded by a locking part; or

[0027] One of the locking parts of each second lug is disposed adjacent to the two second lugs.

[0028] In some embodiments, the central angle between adjacent matching slots is less than or equal to 30° and greater than or equal to 10°.

[0029] In some embodiments, the transmission gearbox further includes a torque adjustment module, which includes an aluminum head shell and a torque adjustment mechanism, wherein the torque adjustment mechanism is assembled on the aluminum head shell, and the aluminum head shell and the second gearbox housing are assembled together, wherein the aluminum head shell and the second gearbox housing are made of metal materials.

[0030] [Second aspect of this application]

[0031] According to a second aspect of this application, a power tool is provided, comprising a transmission gearbox and a main unit module, wherein the transmission gearbox is mounted on the main unit module. The transmission gearbox includes a gearbox housing, a gear transmission module, and an intermediate section. The gearbox housing includes a first gearbox housing and a second gearbox housing. The gear transmission module includes a first gear reduction assembly housed within the first gearbox housing and a second gear reduction assembly housed within the second gearbox housing. The first gear reduction assembly drives the second gear reduction assembly for output. The first gear reduction assembly includes a transmission internal gear ring, and the intermediate section axially separates the first gear reduction assembly. The first gear reduction assembly and the second gear reduction assembly have an intermediate portion including an anti-rotation part integrally formed with the gearbox housing and a support part integrally formed with at least part of the gearbox housing. The internal gear ring is axially moved to engage or disengage from the anti-rotation part to switch the speed of the first gear reduction assembly. The support part supports the second gear reduction assembly to prevent the axial force of the second gear reduction assembly from being transmitted to the anti-rotation part. The support part is located at the end of the first gearbox housing and is disposed opposite to the second gearbox housing. The anti-rotation part has multiple stop teeth and multiple matching grooves located between adjacent stop teeth in the circumferential direction. The central angle of adjacent matching grooves is less than or equal to 30°.

[0032] The purpose and advantages of this application will become fully apparent from the following description and accompanying drawings.

[0033] Compared with the prior art, the beneficial effects of this application are: during the speed reduction process, the speed regulating internal gear ring stops; by using a lower-cost intermediate part to stop the speed regulating internal gear ring during the speed reduction process, the driving force of the speed regulating internal gear ring is more evenly distributed to the first gearbox housing. Attached Figure Description

[0034] Figure 1 This is a cross-sectional schematic diagram and a partial schematic diagram of the middle part of a transmission gearbox according to a preferred embodiment of this application.

[0035] Figure 2 This is a partial exploded view of the transmission gearbox according to the preferred embodiment described above in this application.

[0036] Figure 3 This is a top view and a partial schematic diagram of the middle part of the support portion of the transmission gearbox according to the above-described preferred embodiment of this application.

[0037] Figure 4 This is a right view of the first gearbox housing according to the above-described preferred embodiment of this application.

[0038] Figure 5 This is a perspective view of the first gearbox housing according to the above-described preferred embodiment of this application.

[0039] Figure 6 This is a perspective view of the first gearbox housing from another angle according to the above-described preferred embodiment of this application.

[0040] Figure 7 This is a left view of the first support portion of a modified embodiment of the preferred embodiment described above according to this application.

[0041] Figure 8 This is a partially exploded schematic diagram of a transmission gearbox according to another modified embodiment of the preferred embodiment described above in this application.

[0042] Figure 9 This is a partially exploded schematic diagram of a transmission gearbox according to the above-described modified embodiment of this application.

[0043] Figure 10 This is a left view of the second support portion according to another modified embodiment of this application.

[0044] Figure 11 This is a schematic diagram of a power tool according to another preferred embodiment of the present application. Detailed Implementation

[0045] The present application will be further described below with reference to specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0046] In the description of this application, it should be noted that the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., which indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application 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, and should not be construed as limiting the specific protection scope of this application.

[0047] It should be noted that the terms "first," "second," etc., in the specification and claims of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0048] The terms “comprising” and “having”, and any variations thereof, in the specification and claims of this application are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or device.

[0049] The term "plural" in the specification and claims of this application means two or more.

[0050] The transmission gearbox 1 of this application includes: a gearbox housing, a gear transmission module 10, and an intermediate portion 20. The gearbox housing includes a first gearbox housing 31 and a second gearbox housing 32. The gear transmission module 10 includes a first gear reduction assembly 110 housed in the first gearbox housing 31 and a second gear reduction assembly 120 housed in the second gearbox housing 32. The first gear reduction assembly 110 drives the second gear reduction assembly 120 for output. The first gear reduction assembly 110 includes a transmission internal gear ring 111. The intermediate portion 20 axially separates the first gear reduction assembly 110 and the second gear reduction assembly 120. The intermediate portion 20 includes a section connected to the gearbox housing. The gearbox housing has an integrally formed anti-rotation part 21 and a support part 22 integrally formed with at least part of the gearbox housing. The internal gear ring 111 is axially moved to engage or disengage from the anti-rotation part 21 to switch the speed of the first gear reduction assembly 110. The support part 22 supports the second gear reduction assembly 120 to prevent the axial force of the second gear reduction assembly 120 from being transmitted to the anti-rotation part 21. The support part 22 is located at the end of the first gearbox housing 31 and is disposed opposite to the second gearbox housing 32. The anti-rotation part 21 has a plurality of stop teeth 211 and a plurality of matching grooves 212 located between adjacent stop teeth 211 in the circumferential direction. The central angle α of the adjacent matching grooves 212 is less than or equal to 30°.

[0051] The transmission gearbox 1 includes a high-speed mode and a low-speed mode. When the power tool is adjusted to the low-speed mode, the transmission gearbox 1 includes a movable speed-regulating internal gear ring and an intermediate part 20. The intermediate part 20 of the transmission gearbox 1 meshes with the radially driven speed-regulating internal gear ring with a dispersed stop tooth 211 to prevent the speed-regulating internal gear ring from rotating radially. The limiting ring of the intermediate part 20 limits the speed-regulating internal gear ring driven forward to prevent the speed-regulating internal gear ring from moving axially. The speed-changing internal gear ring 111 is engaged or disengaged from the anti-rotation part 21 by axial movement to switch the speed of the first gear reduction assembly 110 so as to drive the first gear assembly transmission mechanism to output low speed.

[0052]

Gear Transmission Module 10

[0053] refer to Figures 1 to 6 In gear transmission module 10 In the preferred embodiment The gear transmission module 10 includes a first gear reduction assembly 110 and a second gear reduction assembly 120, which constitute a multi-stage reduction gear system. The first gear reduction assembly 110 is assembled in the first gearbox housing 31, and the second gear reduction assembly 120 is assembled in the second gearbox housing 32.

[0054] Preferably, the first gear reduction assembly 110 and the second gear reduction assembly 120 constitute a three-stage reduction gear system. In other embodiments, the first gear reduction assembly 110 and the second gear reduction assembly 120 constitute a two-stage reduction gear system, a one-stage reduction gear system, or other levels of reduction gear system.

[0055] It is worth mentioning that, for reference Figure 1 The first gear reduction assembly 110 and the second gear reduction assembly 120 are only roughly positioned to better distinguish them. The first gear reduction assembly 110 drives the second gear reduction assembly 120 for output, so there may be local protrusions into the other gearbox housing.

[0056] The first gear reduction assembly 110 includes a variable internal gear ring 111 and a transmission gear set 112. The variable internal gear ring 111 is movably engaged with or disengaged from the transmission gear set 112, and the transmission gear set 112 drives the second gear reduction assembly 120 to output. The variable internal gear ring 111 moves axially to adjust the speed of the transmission gear set 112.

[0057] Furthermore, the intermediate part 20 is fitted onto the internal gear ring 111, which is driven to move between a stop position and a disengagement position. When the internal gear ring 111 is driven to the stop position, the intermediate part 20 engages the internal gear ring 111, the internal gear is engaged, and the second gear reduction assembly 120 outputs at low speed. When the internal gear is moved to the disengagement position, the intermediate part 20 and the internal gear ring 111 disengage, the first gear reduction assembly 110 outputs at high speed, and the gear transmission module 10 outputs at high speed.

[0058] Preferably, refer to Figure 2 The internal gear ring 111 includes a gear body 1111 and a non-rotating body 1112, wherein the non-rotating body 1112 is disposed radially outside the gear body 1111. The non-rotating body 1112 includes multiple locking teeth 11121, a boss 11122, and multiple radial speed regulating grooves 11123. The gear body 1111, locking teeth 11121, and boss 11122 are integrally formed, wherein the boss 11122 is radially and annularly protruding from the gear body 1111; wherein the axial height of the gear body 1111 is higher than the axial height of the boss 11122, the locking teeth 11121 extend axially from the boss 11122 and are disposed on the outer side of the gear body 1111, and adjacent locking teeth 11121 define a speed regulating groove. The central angle α of adjacent speed regulating grooves is greater than or equal to 10° and less than or equal to 30°.

[0059] Preferably, the number of locking teeth 11121 is 10 or more. More preferably, the number of locking teeth 11121 is greater than or equal to 10 and less than or equal to 24.

[0060] The surface of the locking tooth 11121 is chamfered to guide it into the middle part 20.

[0061] Furthermore, the gear transmission module 10 also includes a speed control gearbox 1, wherein the internal gear ring 111 is driven by the speed control gearbox 1. The speed control gearbox 1 includes a speed control knob 131, a shift cable (not shown), and a gear position channel 133, wherein the speed control knob 131 is externally mounted for direct actuation by the user, the shift cable (not shown) is driven by the speed control knob 131, and the shift cable 132 is connected to the internal gear ring 111, wherein the shift cable (not shown) drives the internal gear ring 111 to move between a stopped position and a disengaged position. The shift cable (not shown) is disposed in the gear position channel 133 to drively connect the speed control knob 131 and the internal gear ring 111.

[0062] [Middle Section 20]

[0063] In the first embodiment of the intermediate portion 20, the intermediate portion 2020 includes: a first anti-rotation portion 2121; a stop tooth 211211; a limiting ring 212; a shape matching groove 212210; a first support portion 2222; a positioning protrusion 231; a positioning groove 232; a locking protrusion 233; a second positioning body 24; a second retaining ring 221B241; a second lug 222B242; and a second locking clearance groove 223B243.

[0064] Reference convex 4 to Figure 6 The intermediate portion 20 axially separates the first gear reduction assembly 110 and the second gear reduction assembly 120. The intermediate portion 20 includes an anti-rotation portion 21 integrally formed with the gearbox housing and a support portion 22 integrally formed with at least part of the gearbox housing. The internal gear ring 111 is axially moved to engage or disengage from the anti-rotation portion 21 to switch the speed of the first gear reduction assembly 110. The support portion 22 supports the second gear reduction assembly 120 to prevent the axial force of the second gear reduction assembly 120 from being transmitted to the anti-rotation portion 21. The support portion 22 is located at the end of the first gearbox housing 31 and is disposed opposite to the second gearbox housing 32. The anti-rotation portion 21 has a plurality of stop teeth 211 and a plurality of matching grooves 212 located between adjacent stop teeth 211 in the circumferential direction. The central angle α of the adjacent matching grooves 212 is less than or equal to 30°.

[0065] More preferably, the central angle α of adjacent matching grooves 212 is less than or equal to 30° and greater than or equal to 10°. Since the matching grooves 212 are used to limit the stopped body 1112 of the internal gear ring 111, and because the central angle of the matching grooves 212 is small, the distance at which the internal gear ring 111 is stopped is small, resulting in better locking. More preferably, the central angle α of adjacent matching grooves 212 is 15°.

[0066] It is worth mentioning that the number of stop teeth 211 is greater than or equal to 10 and less than or equal to 24.

[0067] The support portion 22 is integrally formed on the end of the second gearbox housing 32 and is held by the first gearbox housing 31 and the second gearbox housing 32. The support portion 22 is preferably implemented as a first support portion 22A. Preferably, it is axially locked onto the end face of the second gearbox housing 32. The first support portion 22 includes a retaining ring 221A, a plurality of lugs 222A, and a plurality of locking clearance grooves 223A. The lugs 222A protrude radially from the retaining ring 221A. The retaining ring 221A can be fitted onto the first gear reduction assembly 110 and / or the second gear reduction assembly 120.

[0068] Preferably, refer to Figure 6 Each lug 222A defines at least one locking clearance groove 223A to form a concave shape that radially protrudes from the retaining ring 221A.

[0069] Optionally, refer to Figure 7 Two adjacent lugs 222A define at least one locking clearance groove 223A to form a concave shape that radially protrudes from the retaining ring 221A.

[0070] Preferably, the first support portion 22 includes a retaining ring 221A and a plurality of lugs 222A, the lugs 222A being radially protruding from the retaining ring 221A, the retaining ring 221A being fitted onto the first gear reduction assembly 110 and / or the second gear reduction assembly 120, and the lugs 222A being evenly distributed on the radial outer periphery of the retaining ring 221A.

[0071] Preferably, the number of lugs 222A is four. Optionally, the number of lugs 222A is four. In other embodiments, the number of lugs 222A is more than four. Optionally, the central angle of adjacent lugs 222A is 15° to 120°. More preferably, the central angle of adjacent lugs 222A is 15° to 90°.

[0072] refer to Figure 8 and Figure 9 In another preferred embodiment, 6, the support portion 22 includes a first support portion 22A integrally formed on the end of the first gearbox housing 31 and a second support portion 22B disposed between the first support portion 22A and the second gearbox housing 32. The second support portion 22B is a metal sheet, and the shape of the second support portion 22B is consistent with the shape of the first support portion 22A. The first support portion 22A is plastic.

[0073] The middle part 20 includes a second support part 22B, which is a metal sheet, and the shape of the second anti-rotation part 21 is consistent with the shape of the anti-rotation part 21. The anti-rotation part 21 and the second anti-rotation part 21 are axially overlapped and engaged with the positioning body. The second anti-rotation part 21 is clamped by the anti-rotation body 1112 and the positioning body.

[0074] The intermediate portion 20 includes a second support portion 22B, which includes a second retaining ring 221B, a plurality of second lugs 222B and has a plurality of second locking clearance grooves 223B. The second lugs 222B are radially protruding from the second retaining ring 221B. The second retaining ring 221B can be fitted onto the first gear reduction assembly 110 and / or the second gear reduction assembly 120.

[0075] Preferably, each second lug 222B defines at least one second locking clearance groove 223B to form a concave shape that radially protrudes from the second retaining ring 221B.

[0076] Alternatively, in another preferred embodiment, refer to Figure 10 Two adjacent second lugs 222B define at least one second locking clearance groove 223B to form a concave shape that radially protrudes from the retaining ring 221A.

[0077] The middle part 20 includes a second support part 22B, the second support part 22B includes a second retaining ring 221B and a plurality of second lugs 222B, the second lugs 222B are radially protruding from the second retaining ring 221B, and the second lugs 222B are evenly distributed, wherein the number of second lugs 222B is 3, 4 or more.

[0078] The second support portion 22B has a plurality of second locking clearance slots 223B, and one of the locking portions 33 is embedded in a corresponding second locking clearance slot 223B, wherein:

[0079] Each lug 222A is surrounded by a locking part 33; or

[0080] One of the locking parts 33 of each lug 222A is disposed adjacent to the two lugs 222A.

[0081] The transmission gearbox 1 also includes a torque adjustment module 40, which includes an aluminum head shell 41 and a torque adjustment mechanism 42. The torque adjustment mechanism 42 is assembled on the aluminum head shell 41, and the aluminum head shell 41 and the second gearbox housing 32 are assembled together. The aluminum head shell 41 and the second gearbox housing 32 are made of metal.

[0082] Gearbox housing

[0083] The gearbox housing includes a first gearbox housing 31 and a second gearbox housing 32, as well as a plurality of locking parts 33. The number of locking parts 33 is four; in other embodiments, the number of locking parts 33 is three or more. The first gearbox housing 31 and the second gearbox housing 32 are locked by the locking parts 33. More preferably, each locking part 33 is confined within a locking clearance groove 223A.

[0084] refer to Figure 11 The application also includes a power tool, wherein the power tool includes the transmission gearbox 1 and the main unit module 50 in any of the above embodiments, wherein the transmission gearbox 1 is mounted on the main unit module 50.

[0085]

Host Module 50

[0086] Preferably, the main unit module 50 includes a motor 51, a drive shaft 52, a circuit board 53, a housing 54, and a power supply component 56. The transmission gearbox 1 transmits the power output from the motor 51 to the output shaft 52. The circuit board 53 is electrically connected to the motor 51 and the power supply component 56. The motor 51, drive shaft 52, circuit board 53, working head 55, and power supply component 56 are assembled in the housing 54. A speed control knob 131 is exposed in the external space of the housing 54 for the user to adjust the speed to high or low.

[0087] The main module 50 also includes a working head 55, which is mounted on the drive shaft 52 and driven by the drive shaft 52.

[0088] [The first aspect of this application]

[0089] According to a first aspect of this application, in some embodiments, a transmission gearbox 1 is also provided, comprising:

[0090] The gearbox housing includes a first gearbox housing 31 and a second gearbox housing 32;

[0091] The gear transmission module 10 includes a first gear reduction assembly 110 housed within a first gearbox housing 31 and a second gear reduction assembly 120 housed within a second gearbox housing 32. The first gear reduction assembly 110 drives the second gear reduction assembly 120 for output. The first gear reduction assembly 110 includes a transmission internal gear ring 111.

[0092] The intermediate portion 20 axially separates the first gear reduction assembly 110 and the second gear reduction assembly 120. The intermediate portion 20 includes an anti-rotation portion 21 integrally formed with the gearbox housing and a support portion 22 at least partially integrally formed with the gearbox housing. The internal gear ring 111 is axially moved to engage or disengage from the anti-rotation portion 21 to switch the speed of the first gear reduction assembly 110. The support portion 22 supports the second gear reduction assembly 120 to prevent the axial force of the second gear reduction assembly 120 from being transmitted to the anti-rotation portion 21. Wherein:

[0093] The support part 22 is located at the end of the first gearbox housing 31 and is disposed opposite to the second gearbox housing 32. The anti-rotation part 21 has a plurality of stop teeth 211 and a plurality of matching grooves 212 located between adjacent stop teeth 211 in the circumferential direction. The central angle α of the adjacent matching grooves 212 is less than or equal to 30°.

[0094] Preferably, the stop teeth 211 are radially and evenly distributed, the stop teeth 211 extend along the axial direction, and the length of the stop teeth 211 is less than or equal to the tooth depth of the speed regulating internal gear ring.

[0095] In some embodiments, the support portion 22 is integrally formed on the end of the second gearbox housing 32 and is held between the first gearbox housing 31 and the second gearbox housing 32.

[0096] In some embodiments, the first support portion 22 includes a retaining ring 221A, a plurality of lugs 222A, and a plurality of locking clearance grooves 223A. The lugs 222A protrude radially from the retaining ring 221A. The retaining ring 221A can be fitted onto the first gear reduction assembly 110 and / or the second gear reduction assembly 120, wherein:

[0097] Each lug 222A defines at least one locking clearance groove 223A to form a concave shape that radially protrudes from the retaining ring 221A; or

[0098] Two adjacent lugs 222A define at least one locking clearance groove 223A to form a concave shape that radially protrudes from the retaining ring 221A.

[0099] In some embodiments, the first support portion 22 includes a retaining ring 221A and a plurality of lugs 222A, the lugs 222A being radially protruding from the retaining ring 221A, the retaining ring 221A being fitted onto the first gear reduction assembly 110 and / or the second gear reduction assembly 120, the lugs 222A being evenly distributed, wherein the number of lugs 222A is 3, 4 or more.

[0100] In some embodiments, the support portion 22 includes a first support portion 22 and a second support portion 22B, wherein the first support portion 22 is integrally formed on the end of the second gearbox housing 32 and is clamped by the first gearbox housing 31 and the second gearbox housing 32, and the second support portion is clamped between the first support portion 22 and the second gearbox housing 32.

[0101] In some embodiments, the support portion 22 includes a first support portion 22 integrally formed on the end of the first gearbox housing 31 and a second support portion 22B disposed on the first support portion 22 and the second gearbox housing 32. The second support portion 22B is a metal sheet, and the shape of the second support portion 22B is consistent with the shape of the first support portion 22. The first support portion 22 is made of plastic.

[0102] In some embodiments, the second support portion 22B includes a second retaining ring 221B, a plurality of second lugs 222B, and a plurality of second locking clearance grooves 223B. The second lugs 222B protrude radially from the second retaining ring 221B. The second retaining ring 221B can be fitted onto the first gear reduction assembly 110 and / or the second gear reduction assembly 120, wherein:

[0103] Each second lug 222B defines at least one second locking clearance groove 223B to form a concave shape that radially protrudes from the retaining ring 221A; or

[0104] Two adjacent second lugs 222B define at least one second locking clearance groove 223B to form a concave shape that radially protrudes from the retaining ring 221A.

[0105] In some embodiments, the intermediate portion 20 includes a second support portion 22B, the second support portion 22B includes a second retaining ring 221B and a plurality of second lugs 222B, the second lugs 222B are radially protruding from the second retaining ring 221B, and the second lugs 222B are evenly distributed, wherein the number of second lugs 222B is 3, 4 or more.

[0106] In some embodiments, the second support portion 22B has a plurality of second locking clearance slots 223B, and one of the locking portions 33 is embedded in a corresponding second locking clearance slot 223B, wherein:

[0107] Each second lug 222B is surrounded by a locking part 33; or

[0108] One of the locking parts 33 of each second lug 222B is disposed adjacent to the two second lugs 222B.

[0109] In some embodiments, the central angle α of adjacent matching slots 212 is less than or equal to 30° and greater than or equal to 10°.

[0110] In some embodiments, the transmission gearbox 1 further includes a torque adjustment module 40, which includes an aluminum head shell 41 and a torque adjustment mechanism 42, wherein the torque adjustment mechanism 42 is assembled on the aluminum head shell 41, and the aluminum head shell 41 and the second gearbox housing 32 are assembled together, wherein the aluminum head shell 41 and the second gearbox housing 32 are made of metal materials.

[0111] [Second aspect of this application]

[0112] According to a second aspect of this application, a power tool is provided, comprising a transmission gearbox 1 and a main unit module 50, wherein the transmission gearbox 1 is assembled into the main unit module 50. The transmission gearbox 1 includes a gearbox housing, a gear transmission module 10, and an intermediate portion 20. The gearbox housing includes a first gearbox housing 31 and a second gearbox housing 32. The gear transmission module 10 includes a first gear reduction assembly 110 housed within the first gearbox housing 31 and a second gear reduction assembly 120 housed within the second gearbox housing 32. The first gear reduction assembly 110 drives the second gear reduction assembly 120 for output. The first gear reduction assembly 110 includes a transmission internal gear ring 111. The intermediate portion 20 axially separates the first gear reduction assembly 110. The first gear reduction assembly 110 and the second gear reduction assembly 120 have an intermediate portion 20 including an anti-rotation portion 21 integrally formed with the gearbox housing and a support portion 22 integrally formed with at least part of the gearbox housing. The internal gear ring 111 is axially moved to engage or disengage from the anti-rotation portion 21 to switch the speed of the first gear reduction assembly 110. The support portion 22 supports the second gear reduction assembly 120 to prevent the axial force of the second gear reduction assembly 120 from being transmitted to the anti-rotation portion 21. The support portion 22 is located at the end of the first gearbox housing 31 and is disposed opposite to the second gearbox housing 32. The anti-rotation portion 21 has a plurality of stop teeth 211 along the circumferential direction and a plurality of matching grooves 212 located between adjacent stop teeth 211. The central angle of adjacent matching grooves 212 is less than or equal to 30°.

[0113] The basic principles, main features, and advantages of this application have been described above. Those skilled in the art should understand that this application is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of this application. Various changes and modifications can be made to this application without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection claimed by this application is defined by the appended claims and their equivalents.

Claims

1. A transmission gearbox, characterised in that, include: A gearbox housing, comprising a first gearbox housing and a second gearbox housing; A gear transmission module includes a first gear reduction assembly housed within a first gearbox housing and a second gear reduction assembly housed within a second gearbox housing. The first gear reduction assembly drives the second gear reduction assembly to output power. The first gear reduction assembly includes an internal gear ring. The intermediate portion axially separates the first gear reduction assembly and the second gear reduction assembly. The intermediate portion includes an anti-rotation part integrally formed with the gearbox housing and a support part at least partially integrally formed with the gearbox housing. The internal gear ring is axially moved to engage or disengage from the anti-rotation part to switch the speed of the first gear reduction assembly. The support part supports the second gear reduction assembly to prevent the axial force of the second gear reduction assembly from being transmitted to the anti-rotation part. Wherein: The support portion is located at the end of the first gearbox housing and is disposed opposite to the second gearbox housing. The anti-rotation portion has multiple stop teeth and multiple matching grooves located between adjacent stop teeth in the circumferential direction, and the central angle between adjacent matching grooves is less than or equal to 30°.

2. A transmission gearbox as claimed in claim 1, characterised in that, The support portion is integrally formed at the end of the second gearbox housing and is held between the first gearbox housing and the second gearbox housing.

3. The transmission gearbox according to claim 2, characterized in that, The support portion includes a first support portion, which includes a retaining ring, multiple lugs, and multiple locking clearance grooves. The lugs protrude radially from the retaining ring. The retaining ring can be fitted onto the first gear reduction assembly and / or the second gear reduction assembly, wherein: Each of the lugs defines at least one of the locking clearance grooves to form a concave shape that radially protrudes from the retaining ring; or Two adjacent lugs define at least one of the locking clearance grooves to form a concave shape that radially protrudes from the retaining ring.

4. The transmission gearbox according to claim 2, characterized in that, The support portion includes a first support portion, which includes a retaining ring and a plurality of lugs. The lugs are radially protruding from the retaining ring. The retaining ring can be fitted onto the first gear reduction assembly and / or the second gear reduction assembly. The lugs are evenly distributed, wherein the number of lugs is 3, 4 or more.

5. The transmission gearbox according to claim 1, characterized in that, The support portion includes a first support portion and a second support portion, wherein the first support portion is integrally formed on the end of the second gearbox housing and is clamped by the first gearbox housing and the second gearbox housing, and the second support portion is clamped between the first support portion and the second gearbox housing.

6. The transmission gearbox according to claim 1, characterized in that, The support portion includes a first support portion integrally formed on the end of the first gearbox housing and a second support portion disposed between the first support portion and the second gearbox housing. The second support portion is a metal sheet, and the shape of the second support portion is consistent with the shape of the first support portion. The first support portion is made of plastic.

7. The transmission gearbox according to claim 5, characterized in that, The second support portion includes a second retaining ring, a plurality of second lugs, and a plurality of second locking clearance grooves. The second lugs protrude radially from the second retaining ring. The second retaining ring can be fitted onto the first gear reduction assembly and / or the second gear reduction assembly, wherein: Each of the second lugs defines at least one second locking clearance groove to form a concave shape that radially protrudes from the retaining ring; or Two adjacent second lugs define at least one second locking clearance groove to form a concave shape that radially protrudes from the retaining ring.

8. The transmission gearbox according to claim 5, characterized in that, The intermediate portion includes a second support portion, which includes a second retaining ring and a plurality of second lugs. The second lugs are radially protruding from the second retaining ring and are evenly distributed. The number of the second lugs is three, four or more.

9. The transmission gearbox according to claim 5, characterized in that, The gearbox housing includes multiple locking portions, and the second support portion includes multiple second lugs and multiple second locking clearance slots. One of the locking portions is embedded in a corresponding second locking clearance slot, wherein: Each of the second lugs is surrounded by one of the locking portions; or One of the locking portions of each second lug is disposed adjacent to the two second lugs.

10. The transmission gearbox according to claim 1, characterized in that, The central angle between adjacent matching slots is less than or equal to 30° and greater than or equal to 10°.

11. The transmission gearbox according to claim 1, characterized in that, The transmission gearbox also includes a torque adjustment module, which includes an aluminum head shell and a torque adjustment mechanism. The torque adjustment mechanism is assembled on the aluminum head shell, and the aluminum head shell and the second gearbox housing are assembled together. The aluminum head shell and the second gearbox housing are made of metal.

12. A power tool, characterized in that, include: The transmission gearbox according to any one of claims 1 to 9; and A main unit module, wherein the transmission gearbox is mounted on the main unit module.

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