Rv reducer

Abstract

The embodiment of the application provides an RV reducer, by setting an oil injection hole in a planet carrier, setting a through oil hole penetrating through a vertical direction of a rolling pin and setting a centrifugal hole communicating with the through oil hole in a horizontal direction of the rolling pin, so that a lubricating channel is formed, lubricating oil can slide out from the oil injection hole, then fall into the through oil hole and finally flow to the outside of the rolling pin from the centrifugal hole under the centrifugal action, so that the meshing position of the rolling pin and the cycloid gear is lubricated. The lubricating structure is simple in design and easy to realize, and the lubricating oil flows to the outside of the rolling pin through the centrifugal hole under the centrifugal force to lubricate the tooth profile of the cycloid gear, so that the problem of insufficient lubrication at the small area meshing position between the rolling pin and the cycloid gear is solved, and the transmission precision of the RV reducer is maintained.

Description

Technical Field

[0001] This invention relates to the field of RV reducer technology, and particularly to an RV reducer. Background Technology

[0002] RV reducers are the core components of industrial robot transmissions, so they require high precision and reliability. However, the internal structure of RV reducers is complex, and the internal components mesh with each other during use, so lubrication is usually required. Insufficient lubrication can easily lead to wear of the internal components, resulting in a decrease in the performance of the RV reducer.

[0003] However, existing RV reducers require complete disassembly for internal lubrication. After repeated disassembly and reassembly, the accuracy is prone to decrease, leading to distortion of the RV reducer's transmission accuracy. Moreover, for small-area meshing of the internal structure, lubricating oil is easily squeezed out of the structure, resulting in dry friction between the structures. This causes insufficient lubrication and wear of the internal structure. In existing RV reducers, needle rollers mesh between the cycloidal wheel and the needle tooth housing. The needle rollers are cylindrical, and the cycloidal teeth of the cycloidal wheel form line contact (i.e., small-area contact) with the needle rollers. During meshing, the gap between the needle rollers and the cycloidal wheel and the needle tooth housing is too small, which easily leads to insufficient lubrication between the cycloidal wheel and the needle tooth housing, resulting in dry friction and abnormal wear of the cycloidal wheel and needle rollers. Summary of the Invention

[0004] This invention provides an RV reducer, which aims to solve the problem of abnormal wear caused by insufficient lubrication of the needle rollers and cycloidal wheels in existing RV reducers.

[0005] This invention provides an RV reducer, which includes a planetary carrier, a cycloidal wheel, needle rollers, a needle tooth housing, and a rigid disc. The planetary carrier, cycloidal wheel, and rigid disc are arranged sequentially from top to bottom. The needle tooth housing is disposed on the outside of the planetary carrier, cycloidal wheel, and rigid disc. The needle rollers are disposed between the cycloidal wheel and the needle tooth housing. The planetary carrier has an oil injection hole, the needle rollers have a vertically extending oil passage hole, and the needle rollers have a transversely extending centrifugal hole at one end, which communicates with the oil passage hole at the other end.

[0006] Specifically, the oil injection hole includes a vertical section and an inclined section, the inclined section being connected below the vertical section and inclined towards the position of the oil passage hole.

[0007] Specifically, the tilt angle of the inclined segment relative to the vertical direction is defined by the following formula:

[0008]

[0009] Among them, L1 represents the length of the vertical section, L2 represents the length from the top of the vertical section to the top of the needle roller, a1 represents the length from the vertical center line of the vertical section to the vertical center line of the RV reducer, a2 is the length from the vertical center line of the oil through hole to the vertical center line of the RV reducer, and α represents the inclination angle of the inclined section relative to the vertical direction.

[0010] Specifically, a raceway is provided on the outer side of the planet carrier, and the diameter of the inclined section is smaller than the distance from the bottom of the raceway to the bottom of the planet carrier.

[0011] Specifically, an annular groove is transversely provided on the outer side of the needle roller, and one end of the centrifugal hole penetrates through to the annular groove.

[0012] Specifically, a plurality of annular grooves are provided at intervals, a plurality of centrifugal holes are provided at intervals, and the plurality of centrifugal holes are correspondingly provided on the annular grooves.

[0013] Specifically, the groove width of the annular groove, the groove depth of the annular groove, the diameter of the oil injection hole, and the diameter of the centrifugal hole satisfy the following conditions:

[0014] D < d < 2D, where d represents the groove width or the diameter of the oil injection hole or the diameter of the centrifugal hole, and D is the groove depth of the annular groove.

[0015] Specifically, an oil collecting groove is provided on the outer periphery of the rigid disk, and an oil drain hole is provided in the oil collecting groove.

[0016] Specifically, an oil storage groove is provided on the planet carrier, and the oil injection hole is provided in the oil storage groove.

[0017] Specifically, it further includes an oil injection hole plug and an oil drain hole plug. The oil injection hole plug is used to seal the oil injection hole, and the oil drain hole plug is used to seal the oil drain hole.

[0018] An embodiment of the present invention provides an RV reducer. By providing an oil injection hole in the planet carrier, a through oil through hole in the vertical direction of the needle roller, and a centrifugal hole communicating with the oil through hole in the horizontal direction of the needle roller, a lubrication channel is formed. Lubricating oil can slide out from the oil injection hole, then fall into the oil through hole, and finally flow to the outside of the needle roller under the centrifugal force, so as to lubricate the meshing part of the needle roller and the cycloid gear. This lubrication structure is simple and easy to implement. Moreover, the lubricating oil flows to the outside of the needle roller through the centrifugal hole under the centrifugal force to lubricate the tooth profile of the cycloid gear, solving the problem of insufficient lubrication at the small-area meshing part between the needle roller and the cycloid gear, thereby maintaining the transmission accuracy of the RV reducer. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a cross-sectional structural diagram of the RV reducer provided in an embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram of the oil hole passage structure of the RV reducer provided in an embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the end face of the needle roller;

[0023] Figure 4 This is a schematic diagram of the needle roller structure;

[0024] Figure 5 This is a schematic diagram of the external structure of the RV reducer provided in an embodiment of the present invention;

[0025] Figure 6 This is another external structural schematic diagram of the RV reducer provided in an embodiment of the present invention;

[0026] Figure 7 An exploded view of an RV reducer provided in an embodiment of the present invention;

[0027] Figure 8 for Figure 2 Enlarged view of the A-structure;

[0028] Figure 9 This is a schematic diagram showing the inclination angle of the inclined segment;

[0029] Figure 10 This is another schematic diagram of a needle roller structure;

[0030] Figure 11 This is a schematic diagram of the rigid disk structure;

[0031] Figure 12 This is another structural diagram of a rigid disk;

[0032] Figure 13 This is a cross-sectional schematic diagram of a rigid disk;

[0033] Figure 14 This is a schematic diagram of the planetary carrier structure.

[0034] Explanation of the markings in the image:

[0035] 1. Planetary carrier; 11. Oil injection hole; 111. Vertical section; 112. Inclined section; 12. Raceway; 13. Oil reservoir;

[0036] 2. Cycloidal wheel;

[0037] 3. Needle roller; 31. Oil passage hole; 32. Centrifugal hole; 33. Annular groove;

[0038] 4. Needle-tooth shell;

[0039] 5. Rigid disc; 51. Oil collection trough; 52. Oil drain hole;

[0040] 6. Eccentric shaft assembly;

[0041] 7. Main bearing;

[0042] 8. Input axis;

[0043] 9. Planetary gears;

[0044] 10. Snap ring. Detailed Implementation

[0045] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0046] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0047] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0048] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0049] RV reducers are one of the core components of industrial robot transmissions. With the transformation and upgrading of intelligent manufacturing, researchers have put forward high precision and high reliability requirements for the high-precision transmission of RV reducers. RV reducers consist of two stages of reduction: the first stage is a spur gear reducer mechanism that reduces speed according to the gear ratio, and the second stage is a cycloidal gear reducer mechanism that reduces speed according to the difference in the number of teeth. Compared with other reduction methods, this reduction method has advantages such as a large reduction ratio, coaxial transmission, high transmission accuracy, high rigidity, high load capacity, and compact structure, and is widely used in aerospace, robotics, and other industries.

[0050] Specifically, the RV reducer consists of a cycloidal wheel, a needle gear housing, needle rollers, a crankshaft system assembly, a planetary carrier, and a rigid disc. The cycloidal wheel is the core connecting and meshing part of the RV reducer. It connects and supports the crankshaft system assembly and directly meshes with the needle rollers to form a low-tooth-difference transmission for the second stage of reduction. Therefore, it is necessary to maintain the normal operation of the cycloidal wheel to maintain the high transmission performance of the RV reducer.

[0051] Please see Figures 1-5 This invention provides an RV reducer, which includes a planetary carrier 1, a cycloidal wheel 2, a needle roller 3, a needle tooth housing 4, and a rigid disk 5. The planetary carrier 1, the cycloidal wheel 2, and the rigid disk 5 are arranged sequentially from top to bottom. The needle tooth housing 4 is located on the outside of the planetary carrier 1, the cycloidal wheel 2, and the rigid disk 5. The needle roller 3 is located between the cycloidal wheel 2 and the needle tooth housing 4. The planetary carrier 1 is provided with an oil injection hole 11. The needle roller 3 is provided with a through oil passage hole 31 in a vertical direction. The needle roller 3 is provided with a centrifugal hole 32 in a horizontal direction, one end of which extends to the outside. The other end of the centrifugal hole 32 is connected to the oil passage hole 31.

[0052] In this embodiment, by providing an oil injection hole 11 on the planetary carrier 1 and an oil passage hole 31 and a centrifugal hole 32 on the needle roller 3, when oil is injected into the oil injection hole 11, the lubricating oil in the oil injection hole 11 is sprayed from its bottom to the end face of the needle roller 3 and flows into the oil passage hole 31. During the spraying process, the needle tooth housing 4 is fixed and the planetary carrier 1 is slowly rotated. At the same time, the needle roller 3 also rotates in the needle tooth hole of the needle tooth housing 4. Under the action of centrifugal force, the lubricating oil in the oil passage hole 31 flows to the outside of the needle roller 3 through the centrifugal hole 32. During the rotation, the lubricating oil on the outside of the needle roller 3 can lubricate the cycloidal teeth of the cycloidal wheel 2, increasing the lubrication effect. This lubrication structure design is simple and easy to implement. Moreover, the lubricating oil flows to the outside of the needle roller 3 through the centrifugal hole 32 under the centrifugal force to lubricate the tooth profile of the cycloidal wheel 2, solving the problem of insufficient lubrication at the small meshing area between the needle roller 3 and the cycloidal wheel 2, thereby maintaining the transmission accuracy of the RV reducer.

[0053] In specific embodiments, such as Figure 6-7As shown, there are multiple needle rollers 3 arranged in a circumferential array and circumferentially positioned between the cycloidal wheel 2 and the needle tooth housing 4. The lubricating oil in the oil injection hole 11 is sprayed onto the fitting circle formed by the multiple needle rollers 3 and then flows into the oil passage hole 31.

[0054] In addition, the RV reducer also includes an eccentric shaft assembly 6, a main bearing 7, an input shaft 8, a planetary gear 9, and a snap ring 10, such as Figure 1 and Figure 6 As shown, the eccentric shaft assembly 6 is mounted on the planetary carrier 1, the main bearing 7 is mounted between the pin gear housing 4 and the rigid disk 5, the input shaft 8 is mounted at the center of the planetary carrier 1, the planetary gear 9 is located at the bottom of the planetary carrier 1, and the snap ring 10 is mounted at the bottom of the eccentric shaft assembly 6. The input shaft 8 is used to start the RV reducer, and the planetary gear 9 is used to drive the planetary carrier 1 to rotate.

[0055] Specifically, such as Figure 8 As shown, the oil filling hole 11 includes a vertical section 111 and an inclined section 112. The inclined section 112 is connected to the lower part of the vertical section 111 and is inclined toward the position of the oil passage hole 31.

[0056] In this embodiment, combined with Figure 1 Because of the positional relationship between the planetary carrier 1 and the needle roller 3, the lubricating oil cannot fall vertically from the oil filling hole 11 into the oil passage hole 31. Therefore, the oil filling hole 11 is set as a J-shaped oil filling hole structure composed of a vertical section 111 and an inclined section 112. The inclined section 112 is set to be inclined towards the oil passage hole 31. Moreover, the inclined section 112 can also be set with different inclination angles according to the position of the needle roller 3, so that the lubricating oil can fall smoothly from the oil filling hole 11 into the oil passage hole 31.

[0057] Specifically, such as Figure 9 As shown, the tilt angle of the inclined segment 112 relative to the vertical direction is defined by the following formula:

[0058]

[0059] Where L1 represents the length of the vertical section, L2 represents the length from the top of the vertical section to the top of the needle roller, a1 represents the length from the vertical centerline of the vertical section to the vertical centerline of the RV reducer, a2 represents the length from the vertical centerline of the oil passage to the vertical centerline of the RV reducer, and α represents the tilt angle of the inclined section relative to the vertical direction.

[0060] In this embodiment, in order for the lubricating oil in the oil injection hole 11 to flow precisely into the oil passage hole 31 of the needle roller 3, the inclined section 112 needs to be inclined towards the oil passage hole 31. However, the inclination angle of the inclined section 112 will affect the position where the lubricating oil slides down, so the inclination angle can be calculated according to the above formula. The inclined section 112 can be set as a straight inclined section or an arc inclined section.

[0061] Specifically, such as Figure 1 , Figure 8 and Figure 9 As shown, a raceway 12 is provided on the outer side of the planet carrier 1, and the diameter of the inclined section 112 is smaller than the distance from the bottom of the raceway 12 to the bottom of the planet carrier 1.

[0062] In this embodiment, the raceway 12 is used to implement other functions, and the end of the inclined section 112 is close to the side of the raceway 12. If the diameter of the inclined section 112 is set too large, it will damage the normal operation of the raceway 12 and also affect the operation of the RV reducer. Therefore, in order to avoid the inclined section 112 being too large and damaging the raceway 12, the diameter of the inclined section 112 is smaller than the distance from the bottom of the raceway 12 to the bottom of the planetary carrier 1, which is shown as distance L in 9.

[0063] Specifically, such as Figure 4 and Figure 10 As shown, a transverse annular groove 33 is provided on the outer side of the needle roller 3, and one end of the centrifugal hole 32 extends through the annular groove 33.

[0064] In this embodiment, the annular groove 33 is used to collect the lubricating oil flowing from the centrifugal orifice 32 to the outside of the needle roller 3. The lubricating oil collected in the annular groove 33 can lubricate the outer side of the needle roller 3 and the tooth profile of the cycloidal wheel 2. Specifically, the oil passage 31 collects the lubricating oil sprayed from the oil injection hole 11. During the rotation of the planetary carrier 1 by the fixed needle tooth housing 4, the lubricating oil collected in the oil passage 31 flows from the centrifugal orifice 32 to the annular groove 33 under the action of centrifugal force, thereby lubricating the outer side of the needle roller 3 and the tooth profile of the cycloidal wheel 2. Moreover, the meshing between the needle roller 3 and the cycloidal wheel 2 is a small-area meshing. It is preferable to set the height of the annular groove 33 at the meshing position with the cycloidal wheel 2 to facilitate lubrication.

[0065] In addition, in order to ensure sufficient lubrication between the needle roller 3 and the cycloidal wheel 2, such as Figure 10 As shown, multiple annular grooves 33 can also be provided and spaced apart axially on the outer side of the needle roller 3. Correspondingly, multiple centrifugal holes 32 are spaced apart circumferentially on the annular grooves 33. The annular grooves 33 can be fully annular or semi-annular.

[0066] In this embodiment, multiple annular grooves 33 and centrifugal holes 32 are provided, allowing more lubricating oil to flow from the centrifugal holes 32 to the annular grooves 33. This increases the lubrication area of ​​the needle rollers 3 and the cycloidal wheel 2, improving the lubrication capacity. Furthermore, the lubricating oil in the annular grooves 33 can follow the rotation of the needle rollers 3 and then lubricate the teeth of the cycloidal wheel 2, solving the problem of the needle rollers 3 and the cycloidal wheel 2 not being lubricated in time at their meshing point.

[0067] Meanwhile, it is also necessary to consider the rigidity of the needle roller 3 and the meshing situation between the needle roller 3 and the cycloid gear 2 to avoid damaging the outer side of the needle roller 3 during meshing. Therefore, the groove width of the annular groove 33, the groove depth of the annular groove 33, the diameter of the oil injection hole 11, and the diameter of the centrifugal hole 32 need to meet the following conditions:

[0068] D < d < 2D, where d represents the groove width or the diameter of the oil injection hole or the diameter of the centrifugal hole, and D is the groove depth of the annular groove.

[0069] Since d can represent the groove width of the annular groove 33, the diameter of the oil injection hole 11, or the diameter of the centrifugal hole 32, the value ranges of the groove width of the annular groove 33, the diameter of the oil injection hole 11, and the diameter of the centrifugal hole 32 are the same. It should be noted that since the centrifugal hole 32 is provided in the annular groove 33, the diameter of the centrifugal hole 32 needs to be smaller than the groove width of the annular groove 33, otherwise the integrity of the annular groove 33 will be damaged. If the diameter of the centrifugal hole 32 is greater than the groove width of the annular groove 33, under the centrifugal force, part of the lubricating oil will flow to the parts that do not need lubrication, which is likely to cause waste.

[0070] Specifically, as Figure 11-13 shown, an oil collecting groove 51 is provided on the outer periphery of the rigid disk 5, and an oil drain hole 52 is provided in the oil collecting groove 51.

[0071] In this embodiment, most of the lubricating oil in the oil through hole 31 flows to the annular groove 33 through the centrifugal hole 32 under the centrifugal force, and a small part of the lubricating oil flows into the rigid disk 5. Therefore, an oil collecting groove 51 is provided on the outer periphery of the rigid disk 5 to collect the lubricating oil falling from the oil through hole 31, and an oil drain hole 52 is provided in the oil collecting groove 51 to drain the lubricating oil.

[0072] In a specific embodiment, a sensor can also be provided on the oil collecting groove 51 to detect the amount of lubricating oil in the oil collecting groove 51. When the predetermined amount is reached, the lubricating oil is drained through the oil drain hole 52. In addition, a recovery device can be provided outside the oil drain hole 52 to recover the drained lubricating oil. When the RV reducer needs to change the oil, the recovered lubricating oil is injected into the oil injection hole 11.

[0073] Specifically, as Figure 14 shown, an oil storage groove 13 is provided on the planet carrier 1, and the oil injection hole 11 is provided in the oil storage groove 13.

[0074] In this embodiment, the oil storage groove 13 is used to store the lubricating oil. When lubrication is required at the meshing part of the needle roller 3 and the cycloid gear 2, the lubricating oil in the oil storage groove 13 is injected into the oil injection hole 11, so that the lubricating oil enters the hole passage of the oil injection hole 11, and then sprays onto the end face of the needle roller 3, and then flows into the oil through hole 31. Then, under the centrifugal force, the lubricating oil flows to the annular groove 33, thereby lubricating the meshing part of the needle roller 3 and the cycloid gear 2. Among them, as Figure 14As shown, the oil storage tank 13 is a C-shaped oil storage tank, and the oil filling hole 11 is located in the middle of the C-shaped oil storage tank.

[0075] In a specific embodiment, a sensor can also be installed in the oil storage tank 13 to detect the amount of lubricating oil in the oil storage tank 13. After the lubricating oil in the tank is detected to be used up, the relevant personnel will be notified to replenish the lubricating oil.

[0076] Specifically, it also includes an oil filling hole plug and an oil drain hole plug. The oil filling hole plug is used to seal the oil filling hole 11, and the oil drain hole plug is used to seal the oil drain hole 52.

[0077] In this embodiment, the oil filling hole plug seals the oil reservoir 13 when the RV reducer is working to prevent lubricating oil backflow. The lubricating oil collected in the oil collection tank 51 can be discharged through the drain hole plug. Moreover, the oil filling hole 11, the oil passage 31, and the drain hole 52 form an oil change passage, which allows for lubricating oil replacement without disassembling the RV reducer.

[0078] The lubrication principle of the entire RV reducer is as follows: the lubricating oil collected in the oil reservoir 13 is sprayed onto the end face of the needle roller 3 through the oil injection hole 11, and the lubricating oil flows into the oil passage hole 31. Under the action of centrifugal force, the lubricating oil flows through the centrifugal hole 32 to the annular groove 33, thereby lubricating the meshing point of the needle roller 3 and the cycloidal wheel 2. This lubrication structure solves the problem of poor lubrication flow at the meshing point of the cycloidal teeth of the cycloidal wheel 2 and the needle roller 3 in the prior art. In addition, the RV reducer is also equipped with an oil injection hole plug and an oil drain hole plug to seal the oil injection hole 11 and the oil drain hole 52 respectively. When it is necessary to change the oil in the RV reducer, the oil drain hole plug is removed, and the oil injection hole plug is removed at the same time. The lubricating oil inside the RV reducer falls into the oil collection tank 51 under the action of gravity, and then is discharged from the oil drain hole 52. After the lubricating oil is drained, the oil drain hole 52 is resealed with the oil drain hole plug. It should be noted that when the plug (i.e., the oil filling hole plug or the oil drain hole plug) does not need to be removed, the plug must have a certain degree of sealing to prevent the lubricating oil from flowing back. Therefore, fine-tooth copper plugs are preferred.

[0079] The oil drainage principle of the entire RV reducer is as follows: When injecting oil into the oil injection hole 11, remove the oil injection hole plug and slowly rotate the planetary carrier 1. The lubricating oil is sprayed through the oil injection hole 11 onto the end face of the needle roller 3. The lubricating oil flows to the oil passage hole 31. Under the centrifugal force, most of the lubricating oil flows to the ring groove 33, and a small part of the lubricating oil flows down to the oil collection groove 51. Finally, it is discharged through the oil drain hole 52. The above is the oil drainage path of the entire RV reducer, which solves the problem of changing the oil without disassembling the entire RV reducer.

[0080] By using the RV reducer as described above, the rigidity of the needle roller 3 can be guaranteed, the lubrication effect can be improved, and the oil can be changed quickly without disassembly.

[0081] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An RV reducer, the RV reducer comprising a planetary carrier, a cycloidal wheel, needle rollers, a needle gear housing, and a rigid disc, wherein the planetary carrier, cycloidal wheel, and rigid disc are arranged sequentially from top to bottom, the needle gear housing is disposed on the outer side of the planetary carrier, cycloidal wheel, and rigid disc, and the needle rollers are disposed between the cycloidal wheel and the needle gear housing, characterized in that, An oil injection hole is provided inside the planet carrier. The needle roller is vertically provided with a through oil hole, and the needle roller is horizontally provided with a centrifugal hole with one end penetrating to the outside. The other end of the centrifugal hole is communicated with the through oil hole; The oil injection hole includes a vertical section and an inclined section. The inclined section is connected below the vertical section, and the inclined section is inclined towards the position of the through oil hole; An oil collecting groove is provided on the outer periphery of the rigid disk, and an oil drain hole is provided in the oil collecting groove; A plurality of needle rollers are provided. The plurality of needle rollers are arranged in a circumferential array and are circumferentially arranged between the cycloid gear and the pin tooth housing. The lubricating oil in the oil injection hole is sprayed to the fitting circle formed by the plurality of needle rollers and then flows into the through oil hole.

2. The RV reducer according to claim 1, characterized in that, The inclination angle of the inclined section relative to the vertical direction is defined by the following formula: in, Indicates the length of the vertical segment. Indicates the length from the top of the vertical segment to the top of the needle roller. This indicates the length from the vertical centerline of the vertical segment to the vertical centerline of the RV reducer. It is the length from the vertical centerline of the oil passage hole to the vertical centerline of the RV reducer. This indicates the angle of inclination of the inclined segment relative to the vertical direction.

3. The RV reducer according to claim 1, characterized in that, A raceway is provided on the outside of the planet carrier, and the diameter of the inclined section is smaller than the distance from the bottom of the raceway to the bottom of the planet carrier.

4. The RV reducer according to claim 1, characterized in that, A ring groove is horizontally provided on the outside of the needle roller, and one end of the centrifugal hole penetrates to the ring groove.

5. The RV reducer according to claim 4, characterized in that, A plurality of the ring grooves are provided at intervals, and a plurality of the centrifugal holes are provided at intervals. The plurality of centrifugal holes are correspondingly provided on the ring grooves.

6. The RV reducer according to claim 4, characterized in that, The groove width of the ring groove, the groove depth of the ring groove, the diameter of the oil injection hole, and the diameter of the centrifugal hole satisfy the following conditions: D < d < 2D, where d represents the groove width or the diameter of the oil injection hole or the diameter of the centrifugal hole, and D is the groove depth of the ring groove.

7. The RV reducer according to claim 1, characterized in that, An oil storage groove is provided on the planet carrier, and the oil injection hole is provided in the oil storage groove.

8. The RV reducer according to claim 1, characterized in that, It further includes an oil injection hole plug and an oil drain hole plug. The oil injection hole plug is used to seal the oil injection hole, and the oil drain hole plug is used to seal the oil drain hole.

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