Two-gear gearbox assembly

Abstract

The utility model relates to a two-gear gearbox assembly which comprises an input shaft assembly, a forward clutch assembly, a backward clutch assembly, an intermediate shaft assembly and an output shaft assembly. The input end of the input shaft assembly is connected with a power system, and the output end is simultaneously connected with the input end of the forward clutch assembly and the input end of the backward clutch assembly; the output end of the forward clutch assembly is connected with the output end of the backward clutch assembly; the output end of the retreating clutch assembly is further connected with the input end of the intermediate shaft assembly. The intermediate shaft assembly comprises a first output end and a second output end; the output shaft assembly comprises a first-gear output end and a second-gear output end, the first output end is connected with the first-gear output end, and the second output end is connected with the second-gear output end. According to the gearbox, by changing the layout and arrangement mode of the gear sets, the internal structure of the gearbox is more compact, the size of the gearbox is reduced, and light weight and energy saving are achieved.

Description

Technical Field

[0001] This utility model relates to the field of gearbox technology, and in particular to a two-speed gearbox assembly. Background Technology

[0002] Existing transmissions in construction machinery are large in size, which increases the overall size of the machinery and leads to greater energy loss; or they may compress other internal components, affecting the driving experience. Minimizing the size of the transmission within a limited space has always been a problem that needs to be optimized. Utility Model Content

[0003] The purpose of this utility model is to provide a two-speed transmission assembly, which aims to solve problems such as large transmission size, serious energy loss, or poor driving experience caused by compressed mechanical space by optimizing the internal structure of the transmission.

[0004] To solve the above-mentioned technical problems, this utility model provides a two-speed gearbox assembly, including an input shaft assembly, a forward clutch assembly, a reverse clutch assembly, an intermediate shaft assembly, and an output shaft assembly; one end of the input shaft assembly is used to connect to the power system, and the other end is connected to both the input end of the forward clutch assembly and the input end of the reverse clutch assembly; the output end of the forward clutch assembly is connected to the output end of the reverse clutch assembly; the output end of the reverse clutch assembly is also connected to the input end of the intermediate shaft assembly; the intermediate shaft assembly includes a first output end and a second output end; the output shaft assembly includes a first gear output end and a second gear output end, the first output end is connected to the first gear output end, and the second output end is connected to the second gear output end.

[0005] Furthermore, the input shaft assembly, the reversing clutch assembly, the forward clutch assembly, the intermediate shaft assembly, and the output shaft assembly are distributed along a broken line from top to bottom.

[0006] Furthermore, the input shaft assembly, the reversing clutch assembly, the forward clutch assembly, the intermediate shaft assembly, and the output shaft assembly are all connected by gear meshing.

[0007] Further, the input shaft assembly includes an input gear; the forward clutch assembly includes a forward driving gear, a forward clamping mechanism, and a forward driven gear connected in sequence; the reverse clutch assembly includes a reverse driving gear, a reverse clamping mechanism, a first reverse driven gear, and a second reverse driven gear connected in sequence; the intermediate shaft assembly includes a first intermediate gear, a second intermediate gear, and a third intermediate gear fixed coaxially; the output shaft assembly includes a switchable first-gear output gear and a second-gear output gear. The input gear meshes simultaneously with both the reverse driving gear and the forward driving gear; the forward driven gear meshes with the first reverse driven gear, and the second reverse driven gear meshes with the first intermediate gear; the second intermediate gear and the third intermediate gear mesh with the first-gear output gear and the second-gear output gear, respectively.

[0008] Furthermore, the output shaft assembly further includes: an output shaft for mounting the first gear output gear and the second gear output gear; and a shift ring, which is slidable between the first gear position connecting the output shaft and the first gear output gear and the second gear position connecting the output shaft and the second gear output gear.

[0009] Furthermore, the output shaft assembly also includes a transition sleeve, which is connected to the output shaft and disposed between the first-gear output gear and the second-gear output gear. The shift ring is sleeved outside the transition sleeve. In the first gear position, the shift ring connects the transition sleeve to the first-gear output gear; in the second gear position, the shift ring connects the transition sleeve to the second-gear output gear.

[0010] Furthermore, the output shaft assembly also includes a shift cylinder connected to the shift ring to control the shift ring to be in the first gear position or in the second gear position.

[0011] Furthermore, the shift cylinder includes a shift shaft and a shift fork. The shift fork connects the shift shaft and the shift ring. The shift shaft moves in a direction parallel to the output shaft to control the shift fork to drive the shift ring to switch between first gear and second gear.

[0012] Furthermore, the output shaft assembly also includes: a transfer cylinder, which is symmetrically distributed on both sides of the shift cylinder in the horizontal direction.

[0013] Furthermore, the transfer cylinder includes a transfer rod and a transfer fork; the output shaft assembly also includes a transfer engagement ring; the transfer fork connects the transfer rod and the transfer engagement ring, and the movement of the transfer rod controls the movement of the transfer engagement ring to achieve oil supply to or from the output shaft.

[0014] In some embodiments, the retractable clutch assembly is provided with a guide gear at the retractable clamping mechanism, and the forward clutch assembly is provided with a corresponding gear corresponding to the confirmation gear. The corresponding gear and the guide gear mesh with each other to limit the relative positions of the retractable clutch assembly and the forward clutch assembly, so as to make the transmission structure more accurate.

[0015] In some embodiments, the two-speed gearbox assembly includes: a housing, the inner wall of which is provided with a plurality of bearing positions, and the input shaft assembly, forward clutch assembly, reverse clutch assembly, intermediate shaft assembly and output shaft assembly are all fixedly mounted on the housing via bearings.

[0016] Implementing this utility model embodiment will have the following beneficial effects: by changing the layout and arrangement of the gear set, the internal structure of the gearbox is made more compact, thereby reducing the size of the gearbox and achieving lightweighting and energy saving. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art 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 these drawings without creative effort.

[0018] Figure 1 A schematic diagram of the external structure of a two-speed gearbox assembly provided in one embodiment of this disclosure;

[0019] Figure 2 For along Figure 1 Schematic diagram of the cross-sectional structure of the middle BB line;

[0020] Figure 3 A schematic diagram of the external structure of a two-speed transmission assembly provided in one embodiment of this disclosure from another perspective;

[0021] Figure 4 A two-speed gearbox assembly provided in one embodiment of this disclosure is based on... Figure 3 A schematic diagram of the internal structure of the viewpoint;

[0022] Figure 5 A schematic diagram of the external structure of a two-speed transmission assembly provided in one embodiment of this disclosure from another perspective;

[0023] Figure 6 A two-speed gearbox assembly provided in one embodiment of this disclosure is based on... Figure 5 A schematic diagram of the internal structure of the viewpoint;

[0024] Figure 7 A schematic diagram of the internal structure of a two-speed transmission assembly provided in one embodiment of this disclosure from another perspective;

[0025] Figure 8 This is a schematic diagram of the internal structure of a two-speed gearbox assembly provided in one embodiment of the present disclosure from another perspective.

[0026] Reference numerals: 10. Two-speed gearbox assembly; 11. Housing; 12. Input shaft assembly; 121. Input gear; 13. Forward clutch assembly; 131. Forward drive gear; 132. Forward clamping mechanism; 133. Forward driven gear; 14. Reverse clutch assembly; 141. Reverse drive gear; 142. Reverse clamping mechanism; 143. First reverse driven gear; 144. Second reverse driven gear; 15. Intermediate shaft assembly; 151. First output end; 152. Second output end ; 153, First intermediate gear; 154, Second intermediate gear; 155, Third intermediate gear; 16, Output shaft assembly; 161, First gear output end; 162, Second gear output end; 163, First gear output gear; 164, Second gear output gear; 165, Output shaft; 166, Gear shift ring; 167, Transition bushing; 16A, Shift cylinder; 16B, Gear shift shaft; 16C, Shift fork; 16D, Transfer cylinder; 16E, Transfer lever; 16F, Transfer fork; 16G, Transfer gear shift ring. Detailed Implementation

[0027] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of this utility model are shown in the drawings. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0028] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0030] Existing engineering machinery transmissions are large in size, resulting in increased space requirements, larger overall mechanical volume, and greater energy loss; or they compress the space occupied by other internal components, affecting the driving experience. Minimizing the size of the transmission within a limited space has always been a problem that needs optimization. The purpose of this utility model is to provide a two-speed transmission assembly, aiming to solve the problems of large transmission size, serious energy loss, or poor driving experience caused by compressed mechanical space by optimizing the internal structure of the transmission.

[0031] Combination Figures 1 to 8 As shown, this embodiment of the present disclosure provides a two-speed gearbox assembly 10, including an input shaft assembly 12, a forward clutch assembly 13, a reverse clutch assembly 14, an intermediate shaft assembly 15, and an output shaft assembly 16. The input end of the input shaft assembly 12 is used to connect to a power system, wherein the power system includes, but is not limited to, a motor. The input shaft and the motor shaft can be connected via splines to obtain input power. The output end is connected to both the input end of the forward clutch assembly 13 and the input end of the reverse clutch assembly 14. The output end of the input shaft assembly 12 transmits power simultaneously to both the forward clutch assembly 13 and the reverse clutch assembly 14. The output end of the forward clutch assembly 13 is connected to the output end of the reverse clutch assembly 14. With the reverse clutch assembly 14 disengaged and the forward clutch assembly 13 engaged, the input shaft assembly 12 first transmits power to the forward clutch assembly 13. The engagement of the forward clutch assembly 13 allows power to be transmitted from its input end to its output end. The output end of the forward clutch assembly 13 connects to the output end of the reverse clutch assembly 14, thus transmitting power to its output end. The output end of the reverse clutch assembly 14 also connects to the input end of the intermediate shaft assembly 15, transmitting power to the intermediate shaft assembly 15. The intermediate shaft assembly 15 includes a first output end 151 and a second output end 152. The output shaft assembly 16 includes a first-gear output end 161 and a second-gear output end 162. The first output end 151 connects to the first-gear output end 161, and the second output end 152 connects to the second-gear output end 162. The intermediate shaft assembly 15 transmits power to the output shaft assembly 16, achieving power output. With the reverse clutch assembly 14 engaged and the forward clutch assembly 13 disengaged, power is directly transmitted from the input shaft assembly 12 to the reverse clutch assembly 14, then directly from the reverse clutch assembly 14 to the intermediate shaft assembly 15, and finally from the intermediate shaft assembly 15 to the output shaft assembly 16, thus achieving power output. This enables gear shifting under different operating conditions and reduces the overall size of the gearbox.

[0032] Combination Figure 1As shown, the input shaft assembly 12, the reverse clutch assembly 14, the forward clutch assembly 13, the intermediate shaft assembly 15, and the output shaft assembly 16 are distributed along a broken line from top to bottom. This broken-line distribution design reduces the spatial spacing between the input shaft assembly 12, the reverse clutch assembly 14, the forward clutch assembly 13, the intermediate shaft assembly 15, and the output shaft assembly 16, maximizing the use of the internal space of the gearbox.

[0033] Combination Figure 4 , Figure 6 , Figure 7 and Figure 8 As shown, the input shaft assembly 12, the reverse clutch assembly 14, the forward clutch assembly 13, the intermediate shaft assembly 15, and the output shaft assembly 16 are all connected by gear meshing. Gear meshing reduces the length of the transmission chain, ensuring a tight connection between the shafts.

[0034] In some embodiments, the retracting clutch assembly 14 is provided with a guide gear at the retracting clamping mechanism 142, and the forward clutch assembly 13 is provided with a corresponding gear corresponding to the confirmation gear. The corresponding gear and the guide gear mesh with each other to limit the relative positions of the retracting clutch assembly 14 and the forward clutch assembly 13, so as to make the transmission structure more accurate.

[0035] Combination Figure 4 , Figure 6 , Figure 7 and Figure 8As shown, the input end of the input shaft assembly 12 includes an input gear 121. One end of the input shaft assembly 12 is connected to the power system via the input shaft to obtain power, and the other end is equipped with the input gear 121. The forward clutch assembly 13 includes a forward drive gear 131, a forward clamping mechanism 132, and a forward driven gear 133 connected in sequence. The forward drive gear 131 meshes with the input gear 121 to obtain input power, and the forward clamping mechanism 132 controls the clutch to disengage or engage. When the forward clamping mechanism 132 is engaged, the forward drive gear 131 can transmit power to the forward driven gear 133. When the forward clamping mechanism 132 is disengaged, the forward drive gear 131 receives power and rotates on its own, without transmitting power to the forward driven gear 133. The reverse clutch assembly 14 includes a reverse drive gear 141, a reverse clamping mechanism 142, a first reverse driven gear 143, and a second reverse driven gear 144 connected in sequence. The reversing drive gear 141 meshes with the input gear 121 to obtain power. The reversing clamping mechanism 142 can be disengaged to cut off the connection between the reversing drive gear 141 and the first reversing driven gear 143 and the second reversing driven gear 144. The reversing clamping mechanism 142 engages to connect the reversing drive gear 141 with the first reversing driven gear 143 and the second reversing driven gear 144, so that the reversing drive gear 141 transmits power to the first reversing driven gear 143 and the second reversing driven gear 144. The intermediate shaft assembly 15 includes a first intermediate gear 153, a second intermediate gear 154, and a third intermediate gear 155 coaxially fixed. The first intermediate gear 153, serving as the driving gear of the intermediate shaft assembly 15, meshes with the second reversing driven gear 144 to obtain power. The second intermediate gear 154 and the third intermediate gear 155, serving as the driven gears of the intermediate shaft assembly 15, are coaxially fixed with the first intermediate gear 153, rotating with the first intermediate gear 153 and transmitting power to the output shaft assembly 16. The output shaft assembly 16 includes a switchable first-gear output gear 163 and a second-gear output gear 164. The second intermediate gear 154 and the third intermediate gear 155 mesh with the first-gear output gear 163 and the second-gear output gear 164 respectively. The output gear is controlled by adjusting the connection between the first-gear output gear 163 or the second-gear output gear 164 and the output shaft 165.

[0036] Combination Figures 1 to 8As shown, the output shaft assembly 16 also includes an output shaft 165 and a shift ring 166. The output shaft 165 is used to mount a first-gear output gear 163 and a second-gear output gear 164. The shift ring 166 can slide between the first-gear position connecting the output shaft 165 and the first-gear output gear 163, and between the output shaft 165 and the second-gear output gear 164. The shift ring 166 is mounted on the output shaft 165 and can slide along the output shaft 165. The shift ring 166 is slidably connected to the output shaft 165 via splines. The shift ring 166 is positioned between the first-gear output gear 163 and the second-gear output gear 164. The first-gear output gear 163 and the second-gear output gear 164 are provided with splines corresponding to the shift ring 166. The shift ring 166 can slide between the first-gear position connecting the first-gear output gear 163 and the output shaft 165, and between the second-gear position connecting the second-gear output gear 164 and the output shaft 165, to switch output gears.

[0037] Combination Figure 1 and Figure 2 As shown, the output shaft assembly 16 also includes a transition sleeve 167, which is connected to the output shaft 165 and positioned between the first-gear output gear 163 and the second-gear output gear 164. A shift ring 166 is sleeved on the outside of the transition sleeve 167. In the first gear position, the shift ring 166 connects the transition sleeve 167 to the first-gear output gear 163. In the second gear position, the shift ring 166 connects the transition sleeve 167 to the second-gear output gear 164. The shift ring 166 is splined to the transition sleeve 167, and the transition sleeve 167 is splined to the output shaft 165. Both the first-gear output gear 163 and the second-gear output gear 164 have connecting splines with the transition sleeve 167. The shift ring 166 changes the output gear by connecting the transition sleeve 167 to the first-gear output gear 163 or to the second-gear output gear 164.

[0038] Combination Figures 1 to 8 As shown, the output shaft assembly 16 also includes a shift cylinder 16A. The shift cylinder 16A is connected to the shift ring 166 to control the shift ring 166 to be in first gear or second gear. The shift cylinder 16A includes a shift shaft 16B and a shift fork 16C. The shift fork 16C connects the shift shaft 16B and the shift ring 166. The shift cylinder 16A controls the shift shaft 16B to move in a direction parallel to the output shaft 165 to control the shift fork 16C to drive the shift ring 166 to switch between first gear and second gear.

[0039] Combination Figure 1 , Figure 2 , Figure 5 , Figure 6 and Figure 7As shown, the output shaft assembly 16 also includes a transfer cylinder 16D. The transfer cylinder 16D is symmetrically distributed on both sides of the shift cylinder 16A in the horizontal direction. The transfer cylinder 16D includes a transfer lever 16E and a transfer fork 16F. The output shaft assembly 16 also includes a transfer engagement ring 16G. The transfer engagement ring 16G is sleeved on the output shaft 165. The transfer fork 16F connects the transfer lever 16E and the transfer engagement ring 16G. The transfer cylinder 16D controls the movement of the transfer lever 16E, which in turn drives the transfer fork 16F, controlling the movement of the transfer engagement ring 16G to supply or deactivate the oil supply to the output shaft 165.

[0040] Combination Figures 1 to 8 As shown, the two-speed gearbox assembly 10 also includes a housing 11. The inner wall of the housing 11 has multiple bearing positions. The input shaft assembly 12, forward clutch assembly 13, reverse clutch assembly 14, intermediate shaft assembly 15, and output shaft assembly 16 are all fixedly mounted to the housing 11 via bearings. The input shaft assembly 12 includes an input shaft and an input gear 121. The input gear 121 is mounted on the input shaft. The housing 11 has bearing positions corresponding to the input shaft, and both ends of the input shaft are mounted to these bearing positions via bearings. Similarly, the forward clutch assembly 13 includes a forward clutch shaft. The forward drive gear 131, forward clamping mechanism 132, and forward driven gear 133 are all mounted on the forward clutch shaft, which is mounted to the housing 11 via bearings. The reversing clutch assembly 14 includes a reversing clutch shaft. A reversing drive gear 141, a reversing clamping mechanism 142, a first reversing driven gear 143, and a second reversing driven gear 144 are all mounted on the reversing clutch shaft, which is then mounted to the housing 11 via bearings. The intermediate shaft assembly 15 includes an intermediate shaft. A first intermediate gear 153, a second intermediate gear 154, and a third intermediate gear 155 are all mounted on the intermediate shaft, which is also mounted to the housing 11 via bearings. An output shaft 165 is mounted to the housing 11 via bearings. A hydraulic cylinder mounting position is also provided within the housing 11 to secure the hydraulic cylinder components.

[0041] The foregoing description and accompanying drawings fully illustrate embodiments of this disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The embodiments represent only possible variations, and individual components and functions are optional unless explicitly required, and the order of operations may vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. Moreover, the terminology used in this application is for describing embodiments only and is not intended to limit the claims. As used in the description of embodiments and claims, the singular forms “a,” “an,” and “the” are intended to equally include the plural forms unless the context clearly indicates otherwise. Similarly, the term “and / or” as used in this application means including one or more of the associated listed items and all possible combinations thereof. Additionally, when used in this application, the terms “comprise” and its variations “comprises” and / or “comprising” refer to the presence of stated features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or groups thereof. Unless otherwise specified, an element defined by the phrase "comprising a..." does not exclude the presence of other identical elements in the process, method, or apparatus that includes said element. In this document, each embodiment may focus on its differences from other embodiments, and similar or identical parts between embodiments can be referred to mutually. For methods, products, etc., disclosed in the embodiments, if they correspond to the method section disclosed in the embodiments, then the relevant parts can be referred to the description of the method section.

[0042] The above-described embodiments merely illustrate several implementation methods of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments have been described. However, as long as the combinations of these technical features do not contradict each other, they should be considered within the scope of this specification. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A two-speed gearbox assembly, characterized in that, include: Input shaft assembly (12), forward clutch assembly (13), reverse clutch assembly (14), intermediate shaft assembly (15) and output shaft assembly (16). The input shaft assembly (12) is used to connect the power system to the forward clutch assembly (13) and the reverse clutch assembly (14); the output end of the forward clutch assembly (13) is connected to the output end of the reverse clutch assembly (14); the output end of the reverse clutch assembly (14) is also connected to the input end of the intermediate shaft assembly (15); the intermediate shaft assembly (15) includes a first output end (151) and a second output end (152); the output shaft assembly (16) includes a first gear output end (161) and a second gear output end (162), the first output end (151) is connected to the first gear output end (161), and the second output end (152) is connected to the second gear output end (162).

2. The two-speed gearbox assembly according to claim 1, characterized in that, The input shaft assembly (12), the reversing clutch assembly (14), the forward clutch assembly (13), the intermediate shaft assembly (15), and the output shaft assembly (16) are distributed along a broken line from top to bottom.

3. The two-speed gearbox assembly according to claim 1 or 2, characterized in that, The input shaft assembly (12), the reversing clutch assembly (14), the forward clutch assembly (13), the intermediate shaft assembly (15), and the output shaft assembly (16) are all connected by gear meshing.

4. The two-speed gearbox assembly according to claim 3, characterized in that, The input shaft assembly (12) includes an input gear (121); The forward clutch assembly (13) includes a forward drive gear (131), a forward clamping mechanism (132), and a forward driven gear (133) connected in sequence. The reversing clutch assembly (14) includes a reversing drive gear (141), a reversing clamping mechanism (142), a first reversing driven gear (143), and a second reversing driven gear (144) connected in sequence. The intermediate shaft assembly (15) includes a first intermediate gear (153), a second intermediate gear (154), and a third intermediate gear (155) that are coaxially fixed. The output shaft assembly (16) includes a switchable first-gear output gear (163) and a second-gear output gear (164). The input gear (121) meshes simultaneously with the reversing drive gear (141) and the forward drive gear (131); the forward driven gear (133) meshes with the first reversing driven gear (143), and the second reversing driven gear (144) meshes with the first intermediate gear (153); the second intermediate gear (154) and the third intermediate gear (155) mesh with the first gear output gear (163) and the second gear output gear (164) respectively.

5. The two-speed gearbox assembly according to claim 4, characterized in that, The output shaft assembly (16) also includes: Output shaft (165) is used to mount the first gear output gear (163) and the second gear output gear (164). The gear shift ring (166) is slidable between the first gear position connecting the output shaft (165) and the first gear output gear (163) and the second gear position connecting the output shaft (165) and the second gear output gear (164).

6. The two-speed gearbox assembly according to claim 5, characterized in that, The output shaft assembly (16) further includes a transition sleeve (167), which is connected to the output shaft (165) and disposed between the first gear output gear (163) and the second gear output gear (164). The shift ring (166) is sleeved on the outside of the transition sleeve (167). In the first gear position, the shift ring (166) connects the transition sleeve (167) and the first gear output gear (163); in the second gear position, the shift ring (166) connects the transition sleeve (167) and the second gear output gear (164).

7. The two-speed gearbox assembly according to claim 5, characterized in that, The output shaft assembly (16) also includes: The shift cylinder (16A) is connected to the shift ring (166) to control the shift ring (166) to be in the first gear position or in the second gear position.

8. The two-speed gearbox assembly according to claim 7, characterized in that, The shift cylinder (16A) includes a shift shaft (16B) and a shift fork (16C). The shift fork (16C) connects the shift shaft (16B) and the shift ring (166). The shift shaft (16B) moves in a direction parallel to the output shaft (165) to control the shift fork (16C) to drive the shift ring (166) to switch between first gear and second gear.

9. The two-speed gearbox assembly according to claim 7, characterized in that, The output shaft assembly (16) also includes: The transfer cylinder (16D) is symmetrically distributed on both sides of the shift cylinder (16A) in the horizontal direction.

10. The two-speed gearbox assembly according to claim 9, characterized in that, The transfer cylinder (16D) includes a transfer lever (16E) and a transfer fork (16F); the output shaft assembly (16) also includes a transfer engagement ring (16G); the transfer fork (16F) connects the transfer lever (16E) and the transfer engagement ring (16G), and the movement of the transfer lever (16E) controls the movement of the transfer engagement ring (16G) to supply oil to or shut off the oil supply to the output shaft (165).

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