Single-planet row traction roller type speed increasing mechanism assembly

Abstract

The application relates to a traction type roller speed increasing mechanism assembly with a single planetary row, which comprises a ring component, a planetary wheel subassembly and an inner transmission part, the output end of the ring component is matched with the input end of the planetary wheel subassembly, the inner transmission part is connected with the planetary wheel subassembly, the positive pressure transmitted by the planetary wheel subassembly provides radial support force for the inner transmission part, and the inner transmission part is effectively fixed on the corresponding axis of the planetary wheel subassembly; the application can guarantee sufficient friction while shortening the roller length, so that the structure of the speed increasing mechanism is compact; the roller with a drum-shaped profile line is matched with the inner transmission part with a concave profile line and a friction ring, so that an oil film is easily formed during lubrication, the oil film is not easily lost under high-speed state, and sufficient oil film thickness is maintained.

Description

Technical Field

[0001] This invention relates to the field of planetary speed-increasing mechanism technology, and in particular to a traction roller type speed-increasing mechanism assembly using a single planetary gear set. Background Technology

[0002] Traditional planetary gear speed increasers often suffer from backlash between gears during high-speed operation, resulting in low transmission efficiency, significant power loss, and structural redundancy. Furthermore, when used with large transmission ratios, these mechanisms are not only noisy and unstable, but also require extremely high machining and assembly precision, leading to high costs. They are unsuitable for products requiring low torque, high speed, and high-precision positioning.

[0003] In order to achieve a higher transmission ratio while ensuring a compact structure, planetary gear transmissions are usually chosen instead of traditional gear transmissions in the current technology.

[0004] US Patent No. 20170335891A1 discloses an eccentrically loaded planetary gear train that employs a spring compensation mechanism to compensate for radial pressure. However, it has the following drawbacks: In order to obtain a moderate compensation force at high speeds and provide sufficient clamping force for the wedge effect of the planetary gear train, the initial spring preload needs to be increased. This will lead to pitting on the surface of the planetary gears at low speeds. At the same time, it places high demands on specialized assembly processes and related process equipment.

[0005] Patent No. CN 201610125220.6 discloses a planetary traction transmission reduction mechanism. In order to obtain better support stiffness and effectively reduce the torsional deviation of the rolling element shaft system during transmission, a double-row friction planetary gear is adopted, which increases the number of support points and the contact area. However, its disadvantages are as follows: poor heat dissipation, high requirements for the consistency of the size and tolerance of each friction planetary gear, otherwise tilting or shaking will occur during transmission, which will aggravate the wear of the friction planetary gear, and puts forward high requirements for the manufacturing and assembly processes. Summary of the Invention

[0006] (a) Technical problems to be solved

[0007] To address the aforementioned problems in the prior art, this invention provides a single planetary gearbox traction roller type speed-increasing mechanism assembly, which has a compact structure, adaptively applies frictional force, and is suitable for high-precision, high-speed transmission.

[0008] (II) Technical Solution

[0009] To achieve the above objectives, the main technical solutions adopted by the present invention include:

[0010] The traction roller type speed-increasing mechanism assembly using a single planetary gear set includes: a ring component, a planetary gear sub-assembly, and an internal transmission unit. The output end of the ring component is matched with the input end of the planetary gear sub-assembly. The internal transmission unit is connected to the planetary gear sub-assembly, and the positive pressure transmitted by the planetary gear sub-assembly provides radial support force to the internal transmission unit.

[0011] The ring component includes a friction ring and a shift fork. The shift fork is fixedly connected to the friction ring and is fixedly connected to the power input part. When the input part rotates, the shift fork drives the friction ring to rotate.

[0012] The planetary gear sub-assembly includes a speed increaser housing, rollers, and a pressure cover. The speed increaser housing and the pressure cover are connected to form a chamber. The roller shafts on both sides of the roller are respectively connected to bearings located on both sides of the chamber. The rollers are interference-fitted with the inner wall of the friction ring.

[0013] Furthermore, the friction ring is shell-shaped, with a connecting hole on the side away from the opening end. The shift fork is located inside the friction ring, and its two ends are connected to the side connecting parts on the friction ring. A protrusion is formed in the middle of the shift fork, and the protrusion is fixed in place by cooperating with the connecting hole of the friction ring. A mounting hole is formed on the protrusion, and the input part is fixedly connected to the mounting hole.

[0014] Furthermore, there are three rollers, and the roller shafts on both sides of the three rollers are respectively connected to bearings located on both sides of the cavity. The three rollers are distributed at an included angle, and the friction ring is interference-fitted with the surfaces of the three rollers. The three rollers are interference-fitted with the inner wall of the friction ring. The inner transmission part passes through the speed increaser housing and connects with the outer circle of the three rollers. The three rollers are interference-fitted with the inner transmission part. The roller shafts on both sides of the three rollers are fixedly fitted with bearings, and the bearings at both ends are clearance-fitted with the speed increaser housing and the pressure cover, respectively. The speed increaser housing and the pressure cover are fixed. The inner transmission part is squeezed and installed in the middle of the three rollers, and the friction ring is squeezed and fitted with the three rollers.

[0015] Furthermore, a fastener is fixedly connected to one end of the internal transmission part near the pressure cover.

[0016] Furthermore, the rollers are in line contact with the friction ring and with the inner drive unit, with positive pressure transmitted between the contact surfaces. The inner drive unit is fixed in the middle of the three rollers, with one roller having a slightly larger maximum outer diameter than the other two. The three rollers are in a squeezing fit with the inner drive unit, resulting in an eccentricity between the inner drive unit and the central axis of the friction ring. When the input unit rotates, the shift fork drives the friction ring to rotate. The friction generated by the friction ring squeezing the three rollers drives the three rollers to rotate. The three rollers squeezing the inner drive unit generates friction, which drives the inner drive unit to rotate. A full-film lubricating oil film is formed on the roller surface. When the speed increases, because there is an eccentrically arranged roller with a drum-shaped profile, the deformation of the roller surface can be adaptively adjusted according to the actual required friction force. The roller deformation adjusts itself according to the loading condition, maintaining the oil film thickness between the roller and the inner drive unit, and between the roller and the friction ring, so that the speed increaser can adapt to high-speed loading conditions.

[0017] Furthermore, a positioning component is provided between the speed increaser housing and the pressure cover. After the speed increaser housing and the pressure cover are assembled in place, they are fixed with fasteners.

[0018] Furthermore, the friction ring is fitted with the roller, and the roller is fitted with the internal transmission part. The two are interference-fitted, and there are three ways in which their contact surfaces are fitted.

[0019] The first type: Both the friction ring and the inner transmission part adopt a semi-concave profile that matches the drum-shaped profile on the roller surface. The two semi-concave profiles are diagonally matched to compensate for deformation, reduce oil film loss, align the inner transmission part, and improve transmission quality.

[0020] The second type: The internal transmission part adopts a half-section concave profile, and the friction ring adopts a complete concave profile. The two concave profiles are matched at an angle to compensate for deformation, reduce oil film loss, align the internal transmission part, and improve transmission quality.

[0021] The third type: The internal transmission part adopts a complete concave profile, and the friction ring adopts a half-section concave profile. The two concave profiles are matched at an angle to compensate for deformation, reduce oil film loss, align the internal transmission part, and improve transmission quality. The drum-shaped outer surface of the roller is conducive to the immersion of lubricating oil. When the roller is running, the lubricating oil flows between the roller and the internal transmission part, and between the roller and the friction ring. The three are squeezed together, and a high shear strength lubricating oil film is formed at the joint. This improves the transmission efficiency and forms an oil film on the surface of the contact parts, reducing the wear of the contact parts and improving the stability and life of the contact parts.

[0022] (III) Beneficial Effects

[0023] The beneficial effects of this invention are: while ensuring sufficient friction, the length of the roller is shortened, making the speed-increasing mechanism more compact; the roller with a drum-shaped profile, combined with the inner transmission part and friction ring with a concave profile, makes it easy to form an oil film during lubrication, and the oil film is not easily lost at high speed, maintaining a sufficient oil film thickness. Attached Figure Description

[0024] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0025] Figure 1 This is a three-dimensional structural view of an embodiment of the present invention;

[0026] Figure 2 This is a structural cross-sectional view of an embodiment of the present invention;

[0027] Figure 3 This is a side view of a planetary gear sub-assembly structure according to an embodiment of the present invention;

[0028] Figure 4 This is a schematic diagram of a first matching method between the drum-shaped profile of the roller and the concave profile of the friction ring and the inner drive shaft according to an embodiment of the present invention.

[0029] Figure 5 This is a schematic diagram of a first matching method between the drum-shaped profile of the roller and the concave profile of the friction ring and the inner drive shaft according to an embodiment of the present invention.

[0030] Figure 6 This is a schematic diagram of a second matching method between the drum-shaped profile of the roller and the concave profile of the friction ring and the inner drive shaft, according to an embodiment of the present invention. Detailed Implementation

[0031] To better explain and facilitate understanding of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] An embodiment of the present invention provides a traction roller type speed-increasing mechanism assembly employing a single planetary gearbox, such as... Figure 1 As shown, it includes: a ring component, a planetary gear sub-assembly, and an inner transmission part 1. The output end of the ring component is matched with the input end of the planetary gear sub-assembly. The inner transmission part 1 is an inner transmission shaft. The inner transmission part 1 is connected to the planetary gear sub-assembly. The positive pressure transmitted by the planetary gear sub-assembly provides radial support force for the inner transmission part 1, effectively fixing the inner transmission part 1 on the corresponding axis of the planetary gear sub-assembly.

[0033] Specifically, in this embodiment, such as Figure 1 , Figure 3As shown, the ring component includes a friction ring 6, a shift fork 7, and an input part 8. The friction ring 6 is shell-shaped, with a connecting hole on the side away from the opening end. The shift fork 7 is located inside the friction ring 6, and its two ends are respectively connected to the side connecting parts on the friction ring 6. A protrusion is formed in the middle of the shift fork 7, and the protrusion is fixed by cooperating with the connecting hole of the friction ring 6. A mounting hole is formed on the protrusion, and the power input part 8 is fixedly connected to the mounting hole. When the input part 8 rotates, the shift fork 7 drives the friction ring 6 to rotate.

[0034] Specifically, in this embodiment, such as Figure 1 , Figure 2 , Figure 3 As shown, the planetary gear sub-assembly includes a speed increaser housing 2, rollers 4, and a pressure cover 5. The rollers 4 are drum-shaped, cylindrical, or other shapes; in this embodiment, a drum-shaped roller is used for illustration. The speed increaser housing 2 can be fixed to the housing of the torque input end, or it can be fixed as a component inside the overall housing, and is not limited to this form. The speed increaser housing 2 and the pressure cover 5 are connected to form a chamber. There are three rollers 4, and the roller shafts on both sides of the three rollers 4 are respectively connected to bearings 3 located on both sides of the chamber. The three rollers 4 are distributed at an included angle. Friction ring 6 The inner drive unit 1 is press-fitted with the surfaces of the three rollers 4; the three rollers 4 are press-fitted with the inner wall of the friction ring 6; the inner drive unit 1 passes through the speed increaser housing 2 and connects with the outer circle of the three rollers 4; the three rollers 4 are press-fitted with the inner drive unit 1; the roller shafts on both sides of the three rollers 4 are fixedly fitted with bearings 3, and the bearings 3 at both ends are respectively clearance fitted with the speed increaser housing 2 and the pressure cover 5. The speed increaser housing 2 and the pressure cover 5 are fixed together. The inner drive unit 1 is squeeze-fitted in the middle of the three rollers 4, and the friction ring 6 is squeeze-fitted with the three rollers 4.

[0035] Furthermore, in this embodiment, a fastener 11 is fixedly connected to one end of the inner transmission part 1 near the pressure cover 5 to prevent the inner transmission part 1 from disengaging under working conditions.

[0036] In this embodiment, roller 4 and friction ring 6 are in line contact, and roller 4 and inner transmission part 1 are in line contact, with positive pressure transmitted between the contact surfaces. Based on the central axis of friction ring 6, they are arranged in a triangular opposition. The positive pressure transmitted by roller 4 provides radial support for inner transmission part 1, effectively fixing inner transmission part 1 on the corresponding axis of planetary gear sub-assembly. The positive pressure between friction ring 6, roller 4, and inner transmission part 1 provides friction and power source transmission for the transmission between the three, realizing smooth operation of friction traction transmission while maintaining the rotation of planetary rollers, reducing the complexity of the transmission mechanism. When the speed is overloaded, a slippage action is triggered to protect the driven part.

[0037] In this embodiment, the inner transmission part 1 is fixed in the middle of three rollers 4. One of the rollers 4 is slightly larger than the maximum outer diameter of the other two rollers 4. The three rollers 4 are pressed together with the inner transmission part 1, so that the inner transmission part 1 has an eccentricity relative to the central axis of the friction ring 6. When the input part 8 rotates, the shift fork 7 drives the friction ring 6 to rotate. The friction force generated by the friction ring 6 pressing with the three rollers 4 will drive the three rollers 4 to rotate. The three rollers 4 press the inner transmission part 1 to generate friction force, which drives the inner transmission part 1 to rotate. A full oil film of lubricating oil will be formed on the surface of the rollers 4. When the speed increases, because there is an eccentrically arranged roller 4 and the surface of the roller 4 has a drum-shaped profile, the deformation of the roller 4 surface can be adaptively adjusted according to the actual required friction force. The deformation of the roller 4 adjusts itself according to the loading condition, maintaining the oil film thickness between the roller 4 and the inner transmission part 1, and between the roller 4 and the friction ring 6, so that the speed increaser can adapt to the high-speed loading condition.

[0038] Furthermore, in this embodiment, a positioning element 10 is provided between the speed increaser housing 2 and the pressure cover 5 for fixing. The positioning element 10 is used for positioning and fitting, which facilitates positioning during assembly. After the speed increaser housing 2 and the pressure cover 5 are assembled in place, they are fixed by fasteners 9, which restricts the radial displacement of the roller 4 and also restricts the axial displacement of the roller 4, thereby ensuring that the roller 4 is not prone to shaking or deviation in the rotating state, and improving the transmission quality and torque transmission stability.

[0039] To ensure that the roller 4 undergoes sufficient elastic deformation under the pressure of the inner transmission part 1 and the friction ring 6, and to prevent severe pitting caused by an increased surface contact area due to excessive deformation, a drum-shaped profile is added to the outer contact surface of the roller to increase the contact pair length while shortening the roller length. During high-speed operation, due to load variations, to obtain sufficient friction to match the maximum traction coefficient, an adaptive positive pressure adjustment can be achieved by utilizing the deformation of the drum-shaped surface during compression, while simultaneously forming a wedge effect. The drum-shaped profile of the contact surface allows for a more uniform distribution of contact pressure, preventing surface pitting caused by uneven deformation.

[0040] In this embodiment, the friction ring 6 is fitted with the roller 4, and the roller 4 is fitted with the inner transmission part 1. The two are interference-fitted, and there are three ways to fit their contact surfaces.

[0041] The first type: such as Figure 4 As shown, both the friction ring 6 and the inner transmission part 1 adopt a semi-concave profile that matches the drum-shaped profile on the roller surface. The two semi-concave profiles are diagonally matched to compensate for deformation, reduce oil film loss, align the inner transmission part 1, and improve transmission quality.

[0042] The second type: such as Figure 5As shown, the inner transmission part 1 adopts a half-section concave profile, and the friction ring 6 adopts a complete concave profile. The two concave profiles are matched at an angle to compensate for deformation, reduce oil film loss, align the inner transmission part 1, and improve transmission quality.

[0043] The third type: such as Figure 6 As shown, the inner transmission part 1 adopts a complete concave profile, and the friction ring 6 adopts a half-section concave profile. The two concave profiles are fitted at an angle to compensate for deformation, reduce oil film loss, align the inner transmission part 1, and improve transmission quality. The drum-shaped outer surface of the roller 4 is conducive to the immersion of lubricating oil. When the roller 4 is running, the lubricating oil flows between the roller 4 and the inner transmission part 1, and between the roller 4 and the friction ring 6. The three are squeezed together, and a high shear strength lubricating oil film is formed at the joint. This improves the transmission efficiency and forms an oil film on the surface of the contact parts, reducing wear on the surface of the contact parts and improving the stability and life of the contact parts.

[0044] As can be seen from the above description, the above embodiments of the present invention achieve the following technical effects: the inner transmission part is fixed in the middle of three rollers, one of which is slightly larger than the maximum outer circle of the other two rollers, and the three rollers are pressed together with the inner transmission part, so that the inner transmission part has an eccentricity relative to the central axis of the friction ring; the three rollers are distributed at an angle, and the friction ring is interference-fitted with the three rollers.

[0045] When the input section rotates, the shift fork drives the friction ring to rotate. The friction generated by the friction ring pressing against the three rollers drives the three rollers to rotate. The three rollers press against the internal transmission part, generating friction and driving the internal transmission part to rotate. A full oil film of lubricating oil is formed on the roller surface. When the speed increases, because there is an eccentrically arranged roller with a drum-shaped profile on its surface, the amount of deformation of the roller surface can be adaptively adjusted according to the actual required friction force. The amount of roller deformation adjusts itself according to the loading condition, maintaining the oil film thickness between the roller and the internal transmission part, and between the roller and the friction ring, so that the speed increaser can adapt to high-speed loading conditions.

[0046] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0047] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0048] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms 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 therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0049] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0050] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this application.

[0051] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0052] The above description is only a preferred embodiment of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention should be included in the scope of the present invention.

Claims

1. A traction roller type speed-increasing mechanism assembly using a single planetary gearbox, characterized in that, It includes: The ring component, planetary gear sub-assembly and internal transmission part (1) are provided, wherein the output end of the ring component and the input end of the planetary gear sub-assembly are matched; The inner transmission unit (1) is connected to the planetary gear sub-assembly, and the positive pressure transmitted by the planetary gear sub-assembly provides radial support force for the inner transmission unit (1); The ring component includes a friction ring (6) and a shift fork (7). The shift fork (7) is fixedly connected to the friction ring (6). The shift fork (7) is fixedly connected to the power input part (8). When the input part (8) rotates, the shift fork (7) drives the friction ring (6) to rotate. The planetary gear sub-assembly includes a speed increaser housing (2), a drum-shaped roller (4), and a pressure cover (5). The speed increaser housing (2) and the pressure cover (5) are connected to form a chamber. The roller shafts on both sides of the drum-shaped roller (4) are respectively connected to the bearings (3) located on both sides of the chamber. The drum-shaped roller (4) is interference-fitted with the inner wall of the friction ring (6). There are three drum-shaped rollers (4). The roller shafts on both sides of the three drum-shaped rollers (4) are respectively connected to the bearings (3) located on both sides of the cavity. The three drum-shaped rollers (4) are distributed at an angle. The friction ring (6) is interference-fitted with the surface of the three drum-shaped rollers (4). The three drum-shaped rollers (4) are interference-fitted with the inner wall of the friction ring (6). The inner transmission part (1) passes through the speed increaser housing (2) and the outer wall of the three drum-shaped rollers (4). The three drum-shaped rollers (4) are connected by an interference fit with the inner transmission part (1); the roller shafts on both sides of the three drum-shaped rollers (4) are fixedly fitted with the bearings (3), and the bearings (3) at both ends are respectively fitted with the speed increaser housing (2) and the pressure cover (5). The speed increaser housing (2) and the pressure cover (5) are fixed together. The inner transmission part (1) is installed in the middle of the three drum-shaped rollers (4) by compression. The friction ring (6) is fitted with the three drum-shaped rollers (4) by compression. The drum-shaped roller (4) is in line contact with the friction ring (6), and the drum-shaped roller (4) is in line contact with the inner transmission part (1). There is positive pressure transmission between the contact surfaces. The inner transmission part (1) is fixed in the middle of the three drum-shaped rollers (4). One of the drum-shaped rollers (4) is slightly larger than the maximum outer circle of the other two drum-shaped rollers (4). The three drum-shaped rollers (4) are squeezed together with the inner transmission part (1), so that the inner transmission part (1) has an eccentricity relative to the central axis of the friction ring (6). When the input part (8) rotates, the shift fork (7) drives the friction ring (6) to rotate. The friction force generated by the friction ring (6) and the three drum-shaped rollers (4) will drive the three The drum roller (4) rotates, and the three drum rollers (4) squeeze the inner transmission part (1) to generate friction, which drives the inner transmission part (1) to rotate. A lubricating oil film will be formed on the surface of the drum roller (4). When the speed increases, because there is an eccentrically arranged drum roller (4) and the surface of the drum roller (4) has a drum-shaped profile, the deformation of the surface of the drum roller (4) can be adaptively adjusted according to the actual required friction force. The deformation of the drum roller (4) adjusts itself according to the loading condition, maintaining the oil film thickness between the drum roller (4) and the inner transmission part (1), and between the drum roller (4) and the friction ring (6), so that the speed increaser can adapt to the high-speed loading condition. The friction ring (6) is fitted with the drum roller (4), and the drum roller (4) is fitted with the inner transmission part (1). The two are interference-fitted, and there are three ways to fit their contact surfaces. The first type: The friction ring (6) and the inner transmission part (1) both adopt a half-section concave profile and the drum-shaped profile on the roller surface. The two half-section concave profiles are diagonally matched to compensate for the deformation, reduce oil film loss, and adjust the inner transmission part (1) and improve the transmission quality. The second type: The inner transmission part (1) adopts a half-section concave profile, and the friction ring (6) adopts a complete concave profile. The two concave profiles are matched at an angle to compensate for the deformation, reduce oil film loss, and adjust the inner transmission part (1) and improve the transmission quality. The third type: The inner transmission part (1) adopts a complete concave profile, and the friction ring (6) adopts a half concave profile. The two concave profiles are matched at an angle to compensate for the deformation, reduce the loss of oil film, and adjust the inner transmission part (1) and improve the transmission quality. The drum-shaped outer surface of the drum roller (4) is conducive to the immersion of lubricating oil. When the drum roller (4) is running, the lubricating oil flows into the drum roller (4) and the inner transmission part (1), the drum roller (4) and the friction ring (6). The three are squeezed together, and a lubricating oil film with high shear strength is formed at the joint. This improves the transmission efficiency and forms an oil film on the surface of the contact parts, reduces the wear of the contact parts, and improves the stability and life of the contact parts.

2. The traction roller type speed-increasing mechanism assembly using a single planetary gearbox as described in claim 1, characterized in that: The friction ring (6) is shell-shaped, with a connecting hole on the side away from the opening end. The shift fork (7) is located inside the friction ring (6). The two ends of the shift fork (7) are connected to the side connecting parts on the friction ring (6). A protrusion is formed in the middle of the shift fork (7). The protrusion is fixed in conjunction with the connecting hole of the friction ring (6). An installation hole is formed on the protrusion. The power input part (8) is fixedly connected to the installation hole.

3. The traction roller type speed-increasing mechanism assembly using a single planetary gearbox as described in claim 1, characterized in that: A fastener (11) is fixedly connected to one end of the internal transmission part (1) near the pressure cover (5).

4. The traction roller type speed-increasing mechanism assembly using a single planetary gearbox as described in claim 1, characterized in that: A positioning component (10) is provided between the speed increaser housing (2) and the pressure cover (5). After the speed increaser housing (2) and the pressure cover (5) are assembled in place, they are fixed with fasteners (9).

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