Retarder assembly for a vehicle and vehicle having same

Abstract

The application discloses a reducer assembly for a vehicle and a vehicle with the same. The reducer assembly comprises a main housing, a containing cavity formed in the main housing, the containing cavity having a first wall surface and a second wall surface spaced apart from each other, a transmission gear configured as a plurality of gears meshing with each other and accommodated in the containing cavity, an oil nozzle arranged on the first wall surface and adapted to spray oil towards the transmission gear, and an oil retaining shell accommodated in the containing cavity, the oil retaining shell being arranged on at least a part of the outer periphery of the transmission gear and located between the second wall surface and the transmission gear. According to the reducer assembly designed by the application, the oil retaining shell is arranged on at least a part of the outer periphery of the transmission gear and located between the second wall surface and the transmission gear, so that the transmission gear is prevented from contacting the lubricating liquid at the bottom of the containing cavity, thereby avoiding the resistance of the lubricating liquid to the meshing teeth of the rotating transmission gear.

Description

Technical Field

[0001] This invention relates to the field of speed reducers, and more particularly to a speed reducer assembly for a vehicle and a vehicle having the same. Background Technology

[0002] In related technologies, the reducer housing is equipped with an oil injector and multiple meshing gears. The oil injector is suitable for spraying the lubricant in the reducer housing onto the meshing points of the gears to lubricate them, thereby reducing friction during gear meshing, reducing gear meshing resistance, and extending gear service life. However, the lubricant in the reducer housing will come into contact with the rotating gears and generate resistance to the gears, causing efficiency loss in the reducer and reducing the output torque of the reducer. Summary of the Invention

[0003] This invention aims to at least solve one of the technical problems existing in the prior art. Therefore, one object of this invention is to provide a speed reducer assembly for a vehicle. According to the speed reducer assembly designed according to this invention, by disposing an oil baffle housing on at least a portion of the outer periphery of the transmission gear and located between the second wall surface and the transmission gear, contact between the transmission gear and the lubricating fluid at the bottom of the receiving cavity is avoided, thereby preventing the lubricating fluid from causing resistance to the meshing teeth of the rotating transmission gear.

[0004] The present invention also proposes a vehicle having the above-described reducer assembly.

[0005] The reducer assembly according to the present invention includes: a main housing; a receiving cavity formed therein, the receiving cavity having a first wall and a second wall spaced apart from each other; a transmission gear, the transmission gear being configured as a plurality of meshing gears and received within the receiving cavity; an oil injector, the oil injector being disposed on the first wall and adapted to spray oil toward the transmission gear; and an oil baffle housing, the oil baffle housing being received within the receiving cavity, the oil baffle housing being disposed on at least a portion of the outer periphery of the transmission gear and located between the second wall and the transmission gear.

[0006] According to the reducer assembly of the present invention, by providing an oil baffle in the receiving cavity, the oil baffle is disposed on at least a portion of the outer periphery of the transmission gear and located between the second wall surface and the transmission gear, thereby preventing the transmission gear from contacting the lubricating fluid at the bottom of the receiving cavity, thus preventing the lubricating fluid from causing resistance to the meshing teeth of the rotating transmission gear, thereby reducing the efficiency loss of the reducer assembly and increasing the output torque of the reducer assembly.

[0007] According to some embodiments of the present invention, the oil baffle shell has an oil discharge port that extends in the radial direction.

[0008] According to some embodiments of the present invention, an oil overflow port is formed on the oil baffle shell, and the oil overflow port is located on the side of the oil discharge port near the second wall surface.

[0009] According to some embodiments of the present invention, the transmission gear includes: a first gear, a second gear, and a third gear, wherein the first gear and the second gear mesh, and the second gear and the third gear are coaxially arranged; the oil baffle includes: a first housing, a second housing, and a third housing, wherein the first housing, the second housing, and the third housing are connected to each other and are respectively disposed on at least a portion of the outer periphery of the first gear, at least a portion of the outer periphery of the second gear, and at least a portion of the outer periphery of the third gear.

[0010] According to some embodiments of the present invention, the unloading port and the overflow port are formed in the first housing.

[0011] According to some embodiments of the present invention, the unloading port extends in the circumferential direction of the first gear, and the overflow port is configured as an overflow hole penetrating in the radial direction of the first gear; wherein the cross-sectional area of ​​the unloading port is larger than the cross-sectional area of ​​the overflow hole.

[0012] According to some embodiments of the present invention, the line connecting the overflow hole and the center of the first gear is orthogonal to the second wall surface.

[0013] According to some embodiments of the present invention, an oil outlet is formed on the third housing, the oil outlet being adapted to discharge lubricating fluid from the third housing.

[0014] According to some embodiments of the present invention, the first housing and / or the third housing are formed with a first fixing portion extending in the axial direction, and the inner wall of the main housing is formed with a second fixing portion adapted to cooperate with the first fixing portion. The first fixing portion cooperates with the second fixing portion to fix the oil baffle shell in the receiving cavity.

[0015] According to some embodiments of the present invention, the second housing is formed with connecting legs extending in the radial direction, the free ends of the connecting legs being connected to the main housing.

[0016] According to some embodiments of the present invention, the main housing includes: a first outer shell, in which the receiving cavity is formed, the receiving cavity being open along the axial direction of the transmission gear; a second outer shell, the second outer shell being disposed at the open end of the first outer shell and closing the receiving cavity, and the oil baffle being fixedly connected to the first outer shell and the second outer shell respectively.

[0017] The vehicle according to another embodiment of the present invention is briefly described below.

[0018] The vehicle according to the present invention includes the reducer assembly described in any of the above embodiments. Since the vehicle according to the present invention is equipped with the reducer assembly of the above embodiments, the efficiency loss of the reducer assembly of the vehicle is small, resulting in good power of the vehicle.

[0019] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0020] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0021] Figure 1 This is an exploded view of a reducer assembly according to an embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of the structure of a reducer assembly according to an embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the structure of the oil baffle shell according to an embodiment of the present invention;

[0024] Figure 4 This is a bottom view of the oil baffle according to an embodiment of the present invention.

[0025] Reference numerals: 1. Reducer assembly;

[0026] 11. First outer shell; 12. Second outer shell;

[0027] 21. First gear; 22. Third gear;

[0028] 30. Oil baffle; 31. First housing; 311. Oil discharge port; 312. Oil overflow port; 32. Second housing; 321. Connecting support leg; 33. Third housing; 331. Oil outlet; 34. First fixing part. Detailed Implementation

[0029] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0030] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention 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 invention.

[0031] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0032] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," 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, an electrical connection, or a connection that allows communication between them; 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 invention according to the specific circumstances.

[0033] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can 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 top" of the second 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 second 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.

[0034] In related technologies, the reducer housing is equipped with an oil injector and multiple meshing gears. The oil injector is suitable for spraying the lubricant in the reducer housing onto the meshing points of the gears to lubricate them, thereby reducing friction during gear meshing, reducing gear meshing resistance, and extending gear service life. However, the lubricant in the reducer housing will come into contact with the rotating gears and generate resistance to the gears, causing efficiency loss in the reducer and reducing the output torque of the reducer.

[0035] The following is for reference. Figures 1-4 A speed reducer assembly 1 for a vehicle according to an embodiment of the present invention is described.

[0036] like Figures 1-4 As shown, the reducer assembly 1 according to the present invention includes: a main housing, a transmission gear, an oil injector, and an oil baffle 30; a receiving cavity is formed in the main housing, the receiving cavity having a first wall and a second wall spaced apart from each other, the transmission gear is configured as a plurality of meshing gears and is received in the receiving cavity, the oil injector is disposed on the first wall and adapted to spray oil toward the transmission gear, the oil baffle 30 is received in the receiving cavity, and the oil baffle 30 is disposed on at least a portion of the outer periphery of the transmission gear and located between the second wall and the transmission gear.

[0037] In some embodiments, the receiving cavity of the main housing has a first wall and a second wall spaced apart from each other in the height direction. The first wall is located above the second wall, and an oil nozzle is disposed on the first wall. Lubricating fluid is stored at the bottom of the receiving cavity. The oil nozzle is adapted to draw the lubricating fluid from the bottom of the receiving cavity and spray the lubricating fluid onto the transmission gear and the meshing part of the transmission gear. The lubricating fluid is adapted to lubricate the meshing transmission gear to reduce friction during transmission gear meshing, thereby reducing frictional losses during transmission gear meshing. It is understood that since the receiving cavity contains lubricating fluid, when the transmission gear rotates, the meshing teeth of the transmission gear will generate resistance to the teeth of the transmission gear when they contact the surface of the lubricating fluid and move within the lubricating fluid. Therefore, the oil baffle 30 located between the transmission gear and the second wall can prevent the transmission gear from contacting the lubricating fluid at the bottom of the receiving cavity, thereby reducing the resistance encountered by the transmission gear during rotation.

[0038] According to the reducer assembly 1 of the present invention, by providing an oil baffle 30 in the receiving cavity, the oil baffle 30 is disposed on at least part of the outer periphery of the transmission gear and located between the second wall surface and the transmission gear, the transmission gear is prevented from contacting the lubricating fluid at the bottom of the receiving cavity, thereby preventing the lubricating fluid from causing resistance to the meshing teeth of the rotating transmission gear, thereby reducing the efficiency loss of the reducer assembly 1 and increasing the output torque of the reducer assembly 1.

[0039] According to some embodiments of the present invention, such as Figures 1-4 As shown, an oil drain port 311 that extends in the radial direction is formed on the oil baffle 30.

[0040] In some embodiments, when the oil nozzle provided on the first wall sprays lubricant toward the transmission gear, some of the lubricant will enter the oil baffle 30. The lubricant in the oil baffle 30 will cause resistance to the meshing teeth of the rotating transmission gear. Therefore, the oil baffle 30 has an oil discharge port 311 that extends in the radial direction to discharge the lubricant in the oil baffle 30, thereby reducing the resistance of the lubricant in the oil baffle 30 to the transmission gear and reducing the efficiency loss of the reducer assembly 1.

[0041] According to some embodiments of the present invention, such as Figures 1-4 As shown, an oil overflow port 312 is formed on the oil baffle 30, located on the side of the oil discharge port 311 near the second wall. It can be understood that the oil baffle 30 has an oil discharge port 311 and an oil overflow port 312. The oil overflow port 312 is located on the side of the oil baffle 30 near the second wall, and the oil discharge port 311 is located on the side of the oil baffle 30 away from the second wall. The direction from the oil overflow port 312 to the oil discharge port 311 is configured to be the rotation direction of the transmission gear. Therefore, after the lubricating fluid enters the oil baffle 30 through the nozzle, it can be discharged through the oil overflow port 312 under gravity. Furthermore, the meshing teeth of the rotating transmission gear can push the lubricating fluid towards the oil discharge port 311 and discharge it from there, reducing the amount of lubricating fluid stored in the oil baffle 30. This reduces the contact area between the lubricating fluid and the transmission gear, thereby reducing the resistance caused by the lubricating fluid to the transmission gear.

[0042] According to some embodiments of the present invention, such as Figures 1-4 As shown, the transmission gears include a first gear 21, a second gear, and a third gear 22. The first gear 21 and the second gear mesh, and the second gear and the third gear 22 are coaxially arranged. The oil baffle 30 includes a first housing 31, a second housing 32, and a third housing 33. The first housing 31, the second housing 32, and the third housing 33 are connected to each other and are respectively disposed on at least a portion of the outer periphery of the first gear 21, at least a portion of the outer periphery of the second gear, and at least a portion of the outer periphery of the third gear 22. Thus, the first housing 31, the second housing 32, and the third housing 33 are respectively adapted to prevent the lubricating fluid at the bottom of the receiving cavity from contacting the first gear 21, the second gear, and the third gear 22, thereby reducing the resistance encountered by the first gear 21, the second gear, and the third gear 22 when rotating, reducing the efficiency loss of the reducer assembly 1, and increasing the output torque of the reducer assembly 1.

[0043] According to some embodiments of the present invention, such as Figures 1-4 As shown, the unloading port 311 and the overflow port 312 are formed in the first housing 31.

[0044] In some embodiments, the first gear 21 is configured as a differential gear, and the diameter of the first gear 21 is larger than the diameters of the second gear and the third gear 22. Therefore, when the reducer assembly 1 is not in operation, at least a portion of the first gear 21 is immersed in the lubricating fluid, while the second gear and the third gear 22 are located above the lubricating fluid. Thus, the oil drain port 311 and the overflow port 312 formed in the first housing 31 can reduce the contact area between the first gear 21 and the lubricating fluid, reducing the resistance experienced by the first gear 21 during rotation, thereby reducing the efficiency loss of the reducer assembly 1. It is understood that when the vehicle vibrates, the reducer assembly 1 moves up and down with the vehicle, causing the lubricating fluid at the bottom of the receiving cavity to splash up. The second housing 32 and the third housing 33 can prevent the splashed lubricating fluid from contacting the second gear and the third gear 22, thereby reducing the resistance experienced by the second gear and the third gear 22 during rotation and reducing the efficiency loss of the reducer assembly 1.

[0045] According to some embodiments of the present invention, such as Figures 1-4 As shown, the oil discharge port 311 extends in the circumferential direction of the first gear 21, and the oil overflow port 312 is constructed as an oil overflow hole that penetrates in the radial direction of the first gear 21; wherein the cross-sectional area of ​​the oil discharge port 311 is larger than the cross-sectional area of ​​the oil overflow hole.

[0046] In some embodiments, the oil drain port 311 is located above the lubricant at the bottom of the receiving cavity. When the reducer assembly 1 is not in operation, the oil overflow port 312 is immersed in the lubricant at the bottom of the receiving cavity. The lubricant stored at the bottom of the receiving cavity will enter the first housing 31 through the oil overflow port 312. When the reducer assembly 1 is in operation, the first gear 21 rotates and the meshing teeth of the first gear 21 push the lubricant in the first housing 31 to be discharged from the oil drain port 311. The cross-sectional area of ​​the oil drain port 311 is larger than the cross-sectional area of ​​the oil overflow port 312, which can make the speed at which the lubricant is discharged from the first housing 31 greater than the speed at which the lubricant enters the first housing 31. This makes the level of the lubricant in the first housing 31 lower than the level of the lubricant at the bottom of the receiving cavity. Compared with the reducer assembly 1 without the oil baffle 30, the reducer assembly 1 of this application with the oil baffle 30 can reduce the contact area between the meshing teeth of the first gear 21 and the lubricant, and reduce the resistance encountered by the first gear 21 when rotating. In some embodiments, when the reducer assembly 1 is in operation, the level of the lubricant at the bottom of the receiving cavity is below the overflow port 312. At this time, the lubricant that enters the first housing 31 through the injector can be discharged through the unloading port 311 and the overflow port 312 respectively.

[0047] According to some embodiments of the present invention, such as Figures 1-4As shown, the line connecting the overflow hole and the center of the first gear 21 is orthogonal to the second wall. Thus, the overflow port 312 is located in the first housing 31 closest to the second wall. When the reducer assembly 1 is running and the lubricant at the bottom of the receiving cavity is below the first housing 31, the overflow port 312 can drain the lubricant in the first housing 31, preventing the lubricant level at the bottom of the receiving cavity from being too low due to the lubricant stored in the first housing 31. This prevents the fuel injector from being unable to draw up the lubricant due to the low lubricant level in the receiving cavity.

[0048] According to some embodiments of the present invention, such as Figures 1-4 As shown, an oil outlet 331 is formed on the third housing 33, which is adapted to discharge the lubricant inside the third housing 33. In some embodiments, the line connecting the oil outlet 331 and the center of the third gear 22 is orthogonal to the second wall surface, which improves the discharge efficiency of the lubricant in the third housing 33 while ensuring that the lubricant in the third housing 33 can be completely drained. The second housing 32 is configured to be open in the axial direction of the second gear, so that the lubricant entering the second housing 32 can be discharged through the open opening of the second housing 32. The axial direction of the first gear 21 is parallel to the axial direction of the second gear.

[0049] According to some embodiments of the present invention, such as Figures 1-4 As shown, the first housing 31 and / or the third housing 33 are formed with a first fixing part 34 extending in the axial direction, and the inner wall of the main housing is formed with a second fixing part adapted to cooperate with the first fixing part 34. The first fixing part 34 cooperates with the second fixing part to fix the oil baffle 30 in the receiving cavity.

[0050] In some embodiments, the first housing 31 has a first fixing portion 34 formed at at least one end in the axial direction of the first gear 21. The first fixing portion 34 extends toward the main housing and cooperates with the second fixing portion of the main housing, thereby fixing the oil baffle 30 in the receiving cavity so that the oil baffle 30 can be stably set in a preset position. In other embodiments, the third housing 33 has a first fixing portion 34 at one end in the axial direction of the third gear 22. The first fixing portion 34 extends toward the main housing and cooperates with the second fixing portion of the main housing to fix the oil baffle 30 in the receiving cavity. The axial direction of the first gear 21 is parallel to the axial direction of the third gear 22. In still other embodiments, the first housing 31 has a first fixing portion 34 formed at at least one end in the axial direction of the first gear 21, and the third housing 33 has a first fixing portion 34 at one end in the axial direction of the third gear 22. The first fixing portion 34 extends toward the main housing and cooperates with the second fixing portion of the main housing to fix the oil baffle 30 in the receiving cavity.

[0051] According to some embodiments of the present invention, such as Figures 1-4As shown, the second housing 32 has a connecting leg 321 extending in the radial direction, and the free end of the connecting leg 321 is connected to the main housing. In some embodiments, both the first housing 31 and the third housing 33 are provided with a first fixing part 34, which cooperates with the second fixing part to fix the oil baffle 30 in the receiving cavity. The connecting leg 321 of the second housing 32 is connected to the inner wall of the main housing to further improve the fixing stability of the oil baffle 30.

[0052] According to some embodiments of the present invention, such as Figures 1-4 As shown, the main housing includes a first outer shell 11 and a second outer shell 12. The first outer shell 11 has a receiving cavity formed within it, which opens upwards along the axial direction of the transmission gear. The second outer shell 12 is disposed at the open end of the first outer shell 11 and closes the receiving cavity. An oil baffle 30 is fixedly connected to both the first outer shell 11 and the second outer shell 12. It can be understood that the oil baffle 30, the fuel injector, and multiple transmission gears are installed in the receiving cavity through the open end of the first outer shell 11. After the oil baffle 30, the fuel injector, and the multiple transmission gears are installed, the second outer shell 12 is connected to the first outer shell 11 to close the receiving cavity, improving the assembly efficiency of the reducer assembly 1. Simultaneously, the first outer shell 11 and the second outer shell 12 respectively fix the oil baffle 30, improving the stability of the oil baffle 30.

[0053] The vehicle according to the present invention is briefly described below.

[0054] The vehicle according to the present invention is provided with a reducer assembly 1 according to the above embodiments. Since the vehicle according to the present invention is provided with any of the reducer assemblies 1 described in the above embodiments, the efficiency loss of the reducer assembly 1 of the vehicle is small, resulting in good power of the vehicle.

[0055] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0056] Although embodiments of the present invention have been shown and described above, variations, modifications, substitutions and alterations can be made to the above embodiments.

Claims

1. A speed reducer assembly for a vehicle, characterized in that, include: Main housing; a receiving cavity is formed within the main housing, the receiving cavity having a first wall surface and a second wall surface spaced apart from each other; The transmission gears are configured as multiple meshing gears and housed within the receiving cavity. A fuel injector, the fuel injector being disposed on the first wall surface and adapted to spray fuel toward the transmission gear; An oil baffle is provided within the receiving cavity and is disposed on at least a portion of the outer periphery of the transmission gear and located between the second wall surface and the transmission gear. The oil baffle has an oil discharge port that extends radially through it.

2. The vehicle reducer assembly according to claim 1, characterized in that, An oil overflow port is formed on the oil baffle shell, and the oil overflow port is located on the side of the oil discharge port near the second wall surface.

3. The vehicle reducer assembly according to claim 2, characterized in that, The transmission gear includes a first gear, a second gear, and a third gear, wherein the first gear and the second gear mesh, and the second gear and the third gear are coaxially arranged. The oil baffle includes a first housing, a second housing, and a third housing, wherein the first housing, the second housing, and the third housing are connected to each other and are respectively disposed on at least a portion of the outer periphery of the first gear, at least a portion of the outer periphery of the second gear, and at least a portion of the outer periphery of the third gear.

4. The vehicle reducer assembly according to claim 3, characterized in that, The unloading port and the overflow port are formed in the first housing.

5. The vehicle speed reducer assembly according to claim 4, characterized in that, The oil discharge port extends circumferentially on the first gear, and the oil overflow port is constructed as an overflow hole penetrating the first gear in the radial direction; wherein The cross-sectional area of ​​the unloading port is larger than the cross-sectional area of ​​the overflow hole.

6. The vehicle reduction gear assembly according to claim 5, characterized in that, The line connecting the overflow hole and the center of the first gear is orthogonal to the second wall surface.

7. The vehicle speed reducer assembly according to claim 3, characterized in that, An oil outlet is formed on the third housing, which is adapted to discharge the lubricant inside the third housing.

8. The vehicle reducer assembly according to claim 3, characterized in that, The first housing and / or the third housing are provided with a first fixing portion extending in the axial direction, and the inner wall of the main housing is provided with a second fixing portion adapted to cooperate with the first fixing portion. The first fixing portion and the second fixing portion cooperate to fix the oil baffle shell in the receiving cavity.

9. The vehicle reduction gear assembly according to claim 8, characterized in that, The second housing has a connecting leg extending in the radial direction, the free end of which is connected to the main housing.

10. The reduction gear assembly for a vehicle according to claim 1, characterized in that, The main housing includes: A first housing, wherein the receiving cavity is formed within the first housing, and the receiving cavity opens upward along the axial direction of the transmission gear; The second outer casing is disposed at the open end of the first outer casing and closes the receiving cavity. The oil baffle is fixedly connected to the first outer casing and the second outer casing respectively.

11. A vehicle, characterized in that, Includes the vehicle reduction gear assembly as described in any one of claims 1-10.

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