A roller transmission's cycloidal speed reducer

Abstract

This application provides a cycloidal pinwheel reducer with roller drive. An eccentric input shaft is connected to a housing assembly via a first input bearing and to an output assembly via a second input bearing. The housing assembly is connected to the outer tooth profile of the cycloidal wheel assembly. The output hole of the cycloidal wheel assembly is connected to the output assembly. The eccentric input shaft has a raceway groove corresponding to the cycloidal wheel assembly. A roller assembly is disposed in the raceway groove and is tactilely connected to the center hole of the cycloidal wheel assembly. A first roller limiting member is provided between the first input bearing and the cycloidal wheel assembly. A second roller limiting member is provided between the second input bearing and the cycloidal wheel assembly. The first and second roller limiting members respectively abut against different end faces of the roller assembly, forming an oil reservoir. This application avoids the high processing cost and complex lubrication structure of traditional cylindrical roller bearings, forming an oil reservoir structure while ensuring axial positioning of the rollers, thus ensuring sufficient lubrication of the rollers.

Description

Technical Field

[0001] This application relates to the field of transmission devices and reducers, specifically to a roller-driven cycloidal pinwheel reducer. Background Technology

[0002] The cycloidal pinwheel reducer is a device based on the principle of planetary transmission. It achieves speed reduction and transmission through the meshing of the cycloidal wheel and the pin teeth with a small tooth difference and the eccentric motion of the cycloidal wheel. It features a compact structure, large transmission ratio, and high efficiency, and is suitable for applications such as robots and automated equipment that require high precision and high torque output.

[0003] Existing cycloidal pinwheel reducers typically use cylindrical roller bearings as eccentric bearings to achieve eccentric transmission of the cycloidal wheel. These cylindrical roller bearings usually limit the internal rollers through inner and outer ring structures and their own cages.

[0004] However, existing cycloidal pinwheel reducers have the following problems or defects: First, cylindrical roller bearings and their cages are difficult and costly to manufacture, and an additional axial limiting structure needs to be designed in the reducer specifically for cylindrical roller bearings. Secondly, the oil storage and lubrication structure of eccentric bearings is relatively complex, and the design and processing costs are high.

[0005] It should be noted that the information in the background section above is only used to enhance the understanding of the background technology of this application, and therefore may include technical information that does not constitute technical information known or easily inferred by a person skilled in the art. Summary of the Invention

[0006] In view of the aforementioned problems, this application is made to provide a roller-driven cycloidal pinwheel reducer that overcomes or at least partially solves the aforementioned problems, comprising: an eccentric input shaft, a first input bearing, a second input bearing, a roller assembly, a cycloidal wheel assembly, a housing assembly, and an output assembly; The eccentric input shaft is connected to the housing assembly via the first input bearing and to the output assembly via the second input bearing; The housing assembly is connected to the outer edge tooth profile of the cycloidal wheel assembly via a transmission connection; the output hole of the cycloidal wheel assembly is connected to the output assembly; The eccentric input shaft is provided with a raceway groove corresponding to the cycloidal wheel assembly; the roller assembly is disposed in the raceway groove and is tactilely connected to the center hole of the cycloidal wheel assembly; A first roller limiting member is provided between the first input bearing and the cycloidal wheel assembly; a second roller limiting member is provided between the second input bearing and the cycloidal wheel assembly; the first roller limiting member and the second roller limiting member respectively abut against different end faces of the roller assembly and form an oil storage cavity.

[0007] Furthermore, the first roller limiting member has a first oil reservoir on the side near the roller assembly; the second roller limiting member has a second oil reservoir on the side near the roller assembly.

[0008] Furthermore, the first roller limiting member is an L-shaped annular structure, which is sleeved on the outer ring of the first input bearing and fixedly connected to the housing assembly.

[0009] Furthermore, the second roller limiting member is an L-shaped annular structure, which is sleeved on the outer ring of the second input bearing and fixedly connected to the output assembly.

[0010] Furthermore, the first roller limiting member and the second roller limiting member respectively abut against different end faces of the cycloidal wheel assembly.

[0011] Furthermore, the output assembly includes: an output bearing, an output flange, and several output pins; The output pin passes through the corresponding output hole of the cycloidal wheel assembly; the output pin is fixedly connected to the output flange; the output flange is connected to the housing assembly through the output bearing; The output flange is provided with a stop structure corresponding to the second roller limiter.

[0012] Furthermore, it also includes: a first load-equalizing ring; The load equalization hole of the first load equalization ring is sleeved on the output pin; the first load equalization ring is disposed between different cycloidal wheels of the cycloidal wheel assembly and abuts against the axial end face of different cycloidal wheels, so that the middle hole of the first load equalization ring serves as the outer wall of the oil storage cavity.

[0013] Furthermore, it also includes: a second load-equalizing ring; The load equalization hole of the second load equalization ring is fitted onto the end of the output pin that is away from the output flange.

[0014] Furthermore, the housing assembly includes: an outer shell, an end cap, and a plurality of pin teeth; The needle teeth are disposed on the inner side of the housing; the outer edge tooth profile of the cycloidal wheel assembly meshes with the needle teeth; The end cap is fixedly connected to the outer shell; the end cap is provided with a stop structure corresponding to the first roller limiting member.

[0015] Furthermore, the raceway groove includes a first slot and a second slot; the roller assembly includes a first roller unit and a second roller unit; The first roller unit is disposed in the first slot; the first roller limiting member abuts against the end face of the first roller unit; The second roller unit is disposed in the second slot; the second roller limiting member abuts against the end face of the second roller unit.

[0016] This application has the following advantages: In the embodiments of this application, addressing the problems of high processing costs and complex lubrication structures caused by the use of cylindrical roller bearings in existing cycloidal pinwheel reducers, this application provides a solution using a transmission structure with roller assemblies and double-sided limiting members. Specifically, a roller-driven cycloidal pinwheel reducer includes: an eccentric input shaft, a first input bearing, a second input bearing, a roller assembly, a cycloidal wheel assembly, a housing assembly, and an output assembly; the eccentric input shaft is connected to the housing assembly via the first input bearing and to the output assembly via the second input bearing; the housing assembly... The component is connected to the outer edge tooth profile of the cycloidal wheel assembly; the output hole of the cycloidal wheel assembly is connected to the output component; the eccentric input shaft is provided with a raceway groove corresponding to the cycloidal wheel assembly; the roller assembly is disposed in the raceway groove and is tactilely connected to the center hole of the cycloidal wheel assembly; a first roller limiting member is provided between the first input bearing and the cycloidal wheel assembly; a second roller limiting member is provided between the second input bearing and the cycloidal wheel assembly; the first roller limiting member and the second roller limiting member respectively abut against different end faces of the roller assembly and form an oil reservoir. This application avoids the high processing cost and complex lubrication structure of traditional cylindrical roller bearings by using the first and second roller limiting members to abut against the end faces of the roller assembly, forming an oil reservoir structure while ensuring axial positioning of the rollers, thus ensuring sufficient lubrication of the rollers. Attached Figure Description

[0017] To more clearly illustrate the technical solution of this application, the drawings used in the description of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the input side of a roller-driven cycloidal pinwheel reducer according to an embodiment of this application; Figure 2 This is a schematic diagram of the output side of a roller-driven cycloidal pinwheel reducer according to an embodiment of this application; Figure 3 This is a schematic diagram of the combined structure of the eccentric input shaft, the first roller limiting member, the second roller limiting member, and the roller assembly in an embodiment of this application; Figure 4 This is a cross-sectional view of a roller-driven cycloidal pinwheel reducer according to an embodiment of this application; Figure 5 yes Figure 4 Schematic diagram of the cross-sectional structure of section AA in the middle; Figure 6 yes Figure 4 A partially enlarged structural diagram of section B; The attached figures are labeled as follows: 110. Eccentric input shaft; 111. Raceway groove; 1111. First groove; 1112. Second groove; 112. First roller stop; 1121. First oil reservoir; 113. Second roller stop; 1131. Second oil reservoir; 114. Oil reservoir body; 120. First input bearing; 130. Second input bearing; 140. Roller assembly; 141. First roller unit; 142. Second roller unit; 2. Cycloidal wheel assembly; 3. Housing assembly; 31. Housing; 32. End cap; 33. Pin tooth; 4. Output assembly; 41. Output bearing; 42. Output flange; 43. Output pin; 51. First load equalizing ring; 52. Second load equalizing ring. Detailed Implementation

[0019] To make the objectives, features, and advantages of this application more apparent and understandable, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0020] Through analysis of existing technologies, the inventors discovered that in existing cycloidal pinwheel reducers, the current eccentric transmission structure relies excessively on standard cylindrical roller bearings and cages for positioning. This not only leads to redundant parts and high processing costs, but also prevents the inherent structure from forming a stable, closed oil reservoir during the dynamic eccentric rolling of the rollers. Furthermore, traditional lubrication structures cannot effectively confine grease to the critical areas of roller contact, resulting in rapid grease loss and poor lubrication.

[0021] Based on the above analysis, one of the core technical concepts of this application is to abandon the traditional cylindrical roller bearing and cage, and instead adopt a pure roller structure and set an independent roller limiting component in the reducer, so as to realize the axial limiting of the roller and build an oil storage space at the same time.

[0022] Reference Figures 1 to 6This application illustrates a roller-driven cycloidal pinwheel reducer according to an embodiment of the present application, including: an eccentric input shaft 110, a first input bearing 120, a second input bearing 130, a roller assembly 140, a cycloidal wheel assembly 2, a housing assembly 3, and an output assembly 4; The eccentric input shaft 110 is connected to the housing assembly 3 via the first input bearing 120, and to the output assembly 4 via the second input bearing 130; The housing assembly 3 is connected to the outer edge tooth profile of the cycloidal wheel assembly 2 via a transmission connection; the output hole of the cycloidal wheel assembly 2 is connected to the output assembly 4; The eccentric input shaft 110 is provided with a raceway groove 111 corresponding to the cycloidal wheel assembly 2; the roller assembly 140 is disposed in the raceway groove 111 and is tactilely connected to the center hole of the cycloidal wheel assembly 2. A first roller limiting member 112 is provided between the first input bearing 120 and the cycloidal wheel assembly 2; a second roller limiting member 113 is provided between the second input bearing 130 and the cycloidal wheel assembly 2; the first roller limiting member 112 and the second roller limiting member 113 respectively abut against different end faces of the roller assembly 140 and form an oil storage cavity 114.

[0023] In the embodiments of this application, addressing the problems of high processing costs and complex lubrication structures caused by the use of cylindrical roller bearings in existing cycloidal pinwheel reducers, this application provides a solution using a transmission structure with roller assembly 140 and double-sided limiting members. Specifically, a roller-driven cycloidal pinwheel reducer includes: an eccentric input shaft 110, a first input bearing 120, a second input bearing 130, a roller assembly 140, a cycloidal wheel assembly 2, a housing assembly 3, and an output assembly 4; the eccentric input shaft 110 is connected to the housing assembly 3 via the first input bearing 120 and to the output assembly 4 via the second input bearing 130; the housing assembly 3 and the cycloidal wheel assembly 2 are connected to the cycloidal wheel assembly 3. The outer edge of the cycloidal wheel assembly 2 is connected by toothed profiles; the output hole of the cycloidal wheel assembly 2 is connected to the output assembly 4; the eccentric input shaft 110 is provided with a raceway groove 111 corresponding to the cycloidal wheel assembly 2; the roller assembly 140 is disposed in the raceway groove 111 and is tumbledly connected to the center hole of the cycloidal wheel assembly 2; a first roller limiting member 112 is provided between the first input bearing 120 and the cycloidal wheel assembly 2; a second roller limiting member 113 is provided between the second input bearing 130 and the cycloidal wheel assembly 2; the first roller limiting member 112 and the second roller limiting member 113 respectively abut against different end faces of the roller assembly 140 and form an oil storage cavity 114. This application avoids the high processing cost and complex lubrication structure of traditional cylindrical roller bearings by using the first roller limiting member 112 and the second roller limiting member 113 to abut against the end face of the roller assembly 140, thus ensuring sufficient lubrication of the rollers while guaranteeing axial positioning of the rollers.

[0024] The following will further describe a roller-driven cycloidal pinwheel reducer in this exemplary embodiment.

[0025] It should be noted that the eccentric input shaft 110 is used to receive external power input and generate eccentric rotational motion. The first input bearing 120 and the second input bearing 130 can be respectively arranged at both ends of the axial direction of the eccentric input shaft 110 to support the eccentric input shaft 110 and transmit radial loads.

[0026] The raceway groove 111 is formed on the outer peripheral surface of the eccentric input shaft 110, and the distance between its two side walls is slightly greater than the axial length of the roller assembly 140, thereby providing rolling space for the roller assembly 140.

[0027] The roller assembly 140 rolls within the raceway groove 111 and forms a rolling engagement with the center hole of the cycloidal wheel assembly 2, converting the eccentric motion of the eccentric input shaft 110 into a combined revolution and rotation motion of the cycloidal wheel assembly 2, and then achieving speed reduction transmission through the meshing principle of the small tooth difference of the outer edge tooth profile of the cycloidal wheel.

[0028] The first roller limiting member 112 and the second roller limiting member 113 are respectively disposed on both sides of the roller assembly 140. They achieve axial limiting by abutting against the end face of the roller assembly 140, preventing the roller assembly 140 from axially sliding during rolling, which would cause excessive friction between the end face and the inner wall of the raceway groove 111.

[0029] The first roller limiting member 112 and the second roller limiting member 113 cooperate with the cycloidal wheel assembly 2 and the roller assembly 140 to form the oil storage cavity 114, which is used to contain lubricating grease and ensure that the roller assembly 140 is in a fully lubricated state during transmission.

[0030] The closed or semi-closed space formed by the oil storage cavity 114 may include: the axial clearance between adjacent cycloidal wheels in the cycloidal wheel assembly 2, the axial clearance between rollers in different raceway grooves 111, the radial clearance between each roller and the center hole of the cycloidal wheel assembly 2, and the clearance between each roller and the raceway groove 111.

[0031] The oil reservoir 114 can fully accommodate and confine the lubricating grease, ensuring that the rollers are always fully lubricated during rolling transmission. This simplifies the manufacturing cost and improves the transmission reliability and lifespan of the reducer.

[0032] As an example, the roller assembly 140 can adopt a cylindrical roller structure, and its diameter and length can be designed to match the size of the raceway groove 111 and the center hole of the cycloidal wheel assembly 2. Due to the absence of inner and outer rings and cage design, it usually has higher load performance compared to cylindrical roller bearings of the same size; its axial length can be designed to match the width of the raceway groove 111.

[0033] As an example, the first input bearing 120 and the second input bearing 130 may be deep groove ball bearings.

[0034] Reference Figure 6 In one embodiment of this application, the first roller limiting member 112 is provided with a first oil storage groove 1121 on the side near the roller assembly 140; the second roller limiting member 113 is provided with a second oil storage groove 1131 on the side near the roller assembly 140.

[0035] It should be noted that the first oil reservoir 1121 and the second oil reservoir 1131 are respectively opened on the axial inner end face of the first roller limiting member 112 and the second roller limiting member 113, and their geometric contours are adapted to the end face shape of the roller assembly 140.

[0036] The main function of the oil reservoir is to intercept and store the lubricating grease overflowing from the radial gap between the roller assembly 140 and the central hole of the cycloidal wheel assembly 2, thereby improving the load-bearing performance of the roller assembly 140 by providing auxiliary lubrication. Simultaneously, the grease in the oil reservoir can also reduce the contact friction between the end face of the roller assembly 140 and the corresponding roller limiting member.

[0037] When the roller assembly 140 rotates at high speed with the eccentric input shaft 110, the oil reservoir and the grease inside it can generate a dynamic pressure effect with the end face of the roller assembly 140, thereby providing additional axial support to the roller assembly 140 and further reducing contact friction.

[0038] As an example, the first oil storage tank 1121 and the second oil storage tank 1131 may be annular grooves.

[0039] Reference Figure 3 , Figure 4 and Figure 6 In one embodiment of this application, the first roller limiting member 112 is an L-shaped annular structure. The first roller limiting member 112 is sleeved on the outer ring of the first input bearing 120 and fixedly connected to the housing assembly 3.

[0040] It should be noted that the cross section of the first roller limiting member 112 is bent at right angles in the axial and radial directions of the reducer, and its right-angle retaining edge cooperates with the outer ring edge of the first input bearing 120 to restrict the axial movement of the first roller limiting member 112.

[0041] The radial extension of the first roller stop 112 is used to prevent lubricating grease from overflowing from the central gap of the first input bearing 120.

[0042] As an example, in terms of size design, the inner diameter of the first roller limiter 112 should be larger than the outer diameter of the inner ring of the first input bearing 120 to avoid interference between the first roller limiter 112 and the inner ring of the first input bearing 120.

[0043] As an example, the first roller retainer 112 can be axially fixed to the housing assembly 3 by means of fasteners.

[0044] Reference Figure 3 , Figure 4 and Figure 6 In one embodiment of this application, the second roller limiting member 113 is an L-shaped annular structure. The second roller limiting member 113 is sleeved on the outer ring of the second input bearing 130 and fixedly connected to the output component 4.

[0045] It should be noted that, relative to the first roller limiting member 112, the L-shaped cross-section structure of the second roller limiting member 113 is symmetrically arranged, and its inner right-angle retaining edge cooperates with the outer ring edge of the second input bearing 130. Its radial extension can be used to prevent lubricating grease from leaking from the middle of the second input bearing 130.

[0046] As an example, in terms of dimensional design, the inner diameter of the second roller limiter 113 should be larger than the outer diameter of the inner ring of the second input bearing 130 to avoid interference between the second roller limiter 113 and the inner ring of the second input bearing 130.

[0047] As an example, the second roller stop 113 can be axially fixed to the output component 4 by means of fasteners.

[0048] Reference Figure 4 and Figure 6 In one embodiment of this application, the first roller limiting member 112 and the second roller limiting member 113 respectively abut against different end faces of the cycloidal wheel assembly 2.

[0049] It should be noted that the first roller limiting member 112 and the second roller limiting member 113 are in axial contact or almost in contact with the end face of the cycloidal wheel assembly 2, thereby preventing grease from leaking radially from the end face of the cycloidal wheel.

[0050] Meanwhile, in order to avoid contact friction between the first roller limiting member 112 and the corresponding cycloidal wheel end face, a small axial gap can be preset between the first roller limiting member 112 and the corresponding cycloidal wheel end face, which can effectively prevent grease leakage while avoiding contact friction.

[0051] Reference Figure 4 In one embodiment of this application, the output component 4 includes: an output bearing 41, an output flange 42, and a plurality of output pins 43; The output pin 43 passes through the corresponding output hole of the cycloidal wheel assembly 2; the output pin 43 is fixedly connected to the output flange 42; the output flange 42 is connected to the housing assembly 3 through the output bearing 41; The output flange 42 is provided with a stop structure corresponding to the second roller limiter 113.

[0052] It should be noted that the output hole of the cycloidal wheel assembly 2 forms a radial sliding fit with the output pin 43. Under the action of eccentric thrust, the output pin 43 is pushed to rotate around the main axis of the reducer, thereby realizing the rotation output of the output flange 42.

[0053] The output flange 42 serves as the basic carrier of the output end, and is supported by the housing assembly 3 through the output bearing 41 to withstand the output torque.

[0054] The stop structure on the output flange 42 is used to provide an axial positioning reference and radial support for the second roller limit member 113. The outer ring of the second input bearing 130 and the stop structure on the output flange 42 together define the radial position of the second roller limit member 113.

[0055] As an example, the output bearing 41 may be a crossed roller bearing.

[0056] Reference Figure 5 and Figure 6 In one embodiment of this application, it further includes: a first load-equalizing ring 51; The load equalization hole of the first load equalization ring 51 is sleeved on the output pin 43; the first load equalization ring 51 is disposed between different cycloidal wheels of the cycloidal wheel assembly 2 and abuts against the axial end face of different cycloidal wheels, so that the middle hole of the first load equalization ring 51 serves as the outer wall of the oil storage cavity 114.

[0057] It should be noted that, on the one hand, the first load-equalizing ring 51 can be used to balance the radial load borne by each of the output pins 43; on the other hand, the first load-equalizing ring 51 is located between adjacent cycloidal wheels, and its axial end face contacts the end face of the cycloidal wheel assembly 2, with the area within the central hole of the first load-equalizing ring 51 serving as part of the oil reservoir 114. This structure confines the lubricating grease to the core transmission area near the roller assembly 140, reducing the diffusion of grease to the output pins 43 and other components, thereby reducing transmission friction loss.

[0058] Reference Figure 4 In one embodiment of this application, it further includes: a second load-equalizing ring 52; The load equalization hole of the second load equalization ring 52 is fitted onto the end of the output pin 43 away from the output flange 42.

[0059] It should be noted that one end of the output pin 43 is fixed to the output flange 42, while the other end, under the shear force of the cycloidal wheel assembly 2, is in a state similar to that of a cantilever beam, which is prone to generating a large bending moment. By fitting the second load-equalizing ring 52 onto the free end of the output pin 43, the shear force borne by each output pin 43 at that end can be balanced, the load distribution can be dispersed, and the overall structural rigidity of the output assembly 4 can be improved.

[0060] In one embodiment of this application, the housing assembly 3 includes: a housing 31, an end cap 32, and a plurality of pin teeth 33; The needle tooth 33 is disposed on the inner side of the outer shell 31; the outer edge tooth profile of the cycloidal wheel assembly 2 meshes with the needle tooth 33; The end cap 32 is fixedly connected to the outer shell 31; the end cap 32 is provided with a stop structure corresponding to the first roller limiting member 112.

[0061] It should be noted that the outer shell 31 is the main support structure of the reducer, and the needle teeth 33 are evenly arranged on the inner circumferential surface of the outer shell 31, forming a small tooth difference meshing with the outer edge tooth profile of the cycloidal wheel assembly 2 to realize speed reduction transmission.

[0062] The end cap 32 is used to close the input end opening of the housing 31 and is connected to the housing 31 by fasteners. The stop structure of the end cap 32 is used to axially limit the first roller limiter 112, and together with the outer ring of the first input bearing 120, it defines the radial position of the first roller limiter 112.

[0063] Reference Figure 6 In one embodiment of this application, the raceway groove 111 includes a first groove 1111 and a second groove 1112; the roller assembly 140 includes a first roller unit 141 and a second roller unit 142. The first roller unit 141 is disposed in the first slot 1111; the first roller limiting member 112 abuts against the end face of the first roller unit 141; The second roller unit 142 is disposed in the second slot 1112; the second roller limiting member 113 abuts against the end face of the second roller unit 142.

[0064] It should be noted that the above structure in this embodiment is adapted to a double cycloidal wheel reducer, where the two cycloidal wheels have a 180-degree phase difference in the circumferential direction to counteract radial unbalanced forces.

[0065] The first slot 1111 and the second slot 1112 are arranged axially at intervals along the eccentric input shaft 110, respectively corresponding to the transmission positions of the two cycloidal wheels. The first roller unit 141 and the second roller unit 142 are respectively disposed in the corresponding slots, and are axially abutted and limited by the first roller limiting member 112 and the second roller limiting member 113, respectively, to ensure that the two sets of rollers roll stably in their respective transmission planes.

[0066] Although preferred embodiments of the present application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the embodiments of the present application.

[0067] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes said element.

[0068] The above provides a detailed description of a roller-driven cycloidal pinwheel reducer provided in this application. Specific examples have been used to illustrate the principle and implementation of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​this application. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A roller-driven cycloidal pinwheel reducer, characterized in that, include: Eccentric input shaft, first input bearing, second input bearing, roller assembly, cycloidal wheel assembly, housing assembly, and output assembly; The eccentric input shaft is connected to the housing assembly via the first input bearing and to the output assembly via the second input bearing; The housing assembly is connected to the outer edge tooth profile of the cycloidal wheel assembly via a transmission connection; the output hole of the cycloidal wheel assembly is connected to the output assembly; The eccentric input shaft is provided with a raceway groove corresponding to the cycloidal wheel assembly; the roller assembly is disposed in the raceway groove and is tactilely connected to the center hole of the cycloidal wheel assembly; A first roller limiting member is provided between the first input bearing and the cycloidal wheel assembly; a second roller limiting member is provided between the second input bearing and the cycloidal wheel assembly; the first roller limiting member and the second roller limiting member respectively abut against different end faces of the roller assembly and form an oil storage cavity.

2. The reducer according to claim 1, characterized in that, The first roller limiting member has a first oil reservoir on the side near the roller assembly; the second roller limiting member has a second oil reservoir on the side near the roller assembly.

3. The reducer according to claim 1, characterized in that, The first roller limiting member is an L-shaped ring structure. The first roller limiting member is sleeved on the outer ring of the first input bearing and is fixedly connected to the housing assembly.

4. The reducer according to claim 1, characterized in that, The second roller limiting member is an L-shaped ring structure. The second roller limiting member is sleeved on the outer ring of the second input bearing and is fixedly connected to the output assembly.

5. The reducer according to claim 1, characterized in that, The first roller limiting member and the second roller limiting member respectively abut against different end faces of the cycloidal wheel assembly.

6. The reducer according to claim 1, characterized in that, The output assembly includes: an output bearing, an output flange, and several output pins; The output pin passes through the corresponding output hole of the cycloidal wheel assembly; the output pin is fixedly connected to the output flange; the output flange is connected to the housing assembly through the output bearing; The output flange is provided with a stop structure corresponding to the second roller limiter.

7. The reducer according to claim 6, characterized in that, Also includes: First load-equalizing ring; The load equalization hole of the first load equalization ring is sleeved on the output pin; the first load equalization ring is disposed between different cycloidal wheels of the cycloidal wheel assembly and abuts against the axial end face of different cycloidal wheels, so that the middle hole of the first load equalization ring serves as the outer wall of the oil storage cavity.

8. The reducer according to claim 7, characterized in that, Also includes: Second load-equalizing ring; The load equalization hole of the second load equalization ring is fitted onto the end of the output pin that is away from the output flange.

9. The reducer according to claim 1, characterized in that, The housing assembly includes: an outer shell, an end cap, and a plurality of pin teeth; The needle teeth are disposed on the inner side of the housing; the outer edge tooth profile of the cycloidal wheel assembly meshes with the needle teeth; The end cap is fixedly connected to the outer shell; the end cap is provided with a stop structure corresponding to the first roller limiting member.

10. The reducer according to claim 1, characterized in that, The raceway groove includes a first slot and a second slot; the roller assembly includes a first roller unit and a second roller unit; The first roller unit is disposed in the first slot; the first roller limiting member abuts against the end face of the first roller unit; The second roller unit is disposed in the second slot; the second roller limiting member abuts against the end face of the second roller unit.

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