Pure roller pin rolling and sliding type RV speed reducer
By adopting a pure needle roller sliding RV reducer, and using high-precision needle rollers to replace the traditional cycloidal tooth profile, the problems of complex processing and wear of traditional RV reducers are solved, achieving a low-cost, high-wear-resistant and long-life reduction effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-29
- Publication Date
- 2026-03-20
Smart Images
Figure CN224017640U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to high-precision speed reducer design technical field especially relates to a pure needle roller rolling and sliding RV speed reducer. BACKGROUND
[0002] With the rapid development of industry 4.0, the rise of "5G+AI" wisdom factory, the continuous deepening of intelligent manufacturing; Industrial robots, robot dogs, humanoid robots have gradually been applied to all aspects of life. Industrial robots have been applied to various fields in industrial production, gradually replacing part of repetitive, high-risk work and assisting human work. However, as a key component of industrial robots, high-precision RV reducer, also known as robot joint, accounts for one-fourth to one-third of the entire robot production cost, or even more. At the same time, whether a set of industrial robot is good or not mainly depends on the high and low of the repeatability and service life of the reducer. The traditional RV reducer adopts a cycloidal pin wheel planetary transmission to control and realize speed reduction. The outer tooth profile of the cycloidal pin wheel is a cycloidal profile, which is meshed with the pin teeth fixed on the pin tooth shell. The cycloidal pin wheel reversely rotates a tooth due to eccentric motion every rotation of the crankshaft, thereby realizing high speed reduction ratio.
[0003] For the existing RV speed reducer, it is found through research that the traditional cycloidal pin wheel speed reduction device (RV) has the following problems: the cycloidal tooth profile requires high hardness, strength, wear resistance and precision; which leads to complex processing technology, great processing difficulty and high cost. Moreover, the tooth profile is easily worn during load impact, which causes the internal clearance of the speed reduction device to increase, the noise to increase, the precision to decrease and the service life to be low. INVENTION CONTENTS
[0004] Therefore, the utility model provides a pure needle roller rolling and sliding RV speed reducer to solve the above problems.
[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme:
[0006] A pure needle roller rolling and sliding RV speed reducer, comprising: a shell mounting seat, an input mounting end, an output skeleton, a first speed reduction device and a second speed reduction device; the output skeleton, the first speed reduction device and the second speed reduction device are all installed in the shell mounting seat;
[0007] The first speed reduction device comprises an input gear shaft, N planetary gears and a crank cam shaft, the input mounting end is used for fixing the input gear shaft, and N planetary gears are all meshed with the input gear shaft; the input gear shaft and N planetary gears mesh and rotate to transmit power to the crank cam shaft to complete the first speed reduction;
[0008] The second-stage speed reduction device comprises a first needle driving disc, a second needle driving disc, an input connecting disc, an auxiliary needle, a first driving main needle and a second driving main needle;
[0009] The input connecting disc and the output skeleton are mounted at two ends of the housing mounting seat; coaxial first main bearing holes and second main bearing holes are arranged at the two ends of the housing mounting seat, and a housing needle boss is arranged between the two holes; a plurality of auxiliary needle limiting grooves are uniformly distributed on the housing needle boss;
[0010] The first needle driving disc and the second needle driving disc are respectively arranged inside the housing mounting seat; the first needle driving disc and the second needle driving disc have the same structure size; the outer edges of the first needle driving disc and the second needle driving disc are respectively uniformly distributed with the same number of first driving main needle retaining holes and second driving main needle retaining holes; the first driving main needle retaining holes and the second driving main needle retaining holes are distributed in a staggered manner to form a multi-tooth overlapping engagement; the first driving main needle is press-fitted into the first driving main needle retaining hole in an interference manner; the second driving main needle is press-fitted into the second driving main needle retaining hole in an interference manner; and the number of the first driving main needle retaining holes and the second driving main needle retaining holes is less than the number of the auxiliary needle limiting grooves by i.
[0011] The crank cam shaft is provided with a first eccentric boss, a second eccentric boss, a first tapered roller bearing rod and a second tapered roller bearing rod; the first eccentric boss and the second eccentric boss are symmetrically distributed at an angle of 180°; the first needle driving disc is uniformly distributed with a plurality of first inner bearing holes; the second needle driving disc is uniformly distributed with a plurality of second inner bearing holes; the first eccentric boss is connected with the first inner bearing hole in a bearing manner; the second eccentric boss is connected with the second inner bearing hole in a bearing manner; the first eccentric boss and the second eccentric boss respectively drive the first needle driving disc and the second needle driving disc; one end of the second tapered roller bearing rod is provided with a regular polygonal shaft end; the planetary gear is in interference fit with the regular polygonal shaft end of the crank cam shaft through a regular polygonal inner hole; the first tapered roller bearing rod and the second tapered roller bearing rod are coaxial;
[0012] The auxiliary needle is in interference fit with the auxiliary needle limiting groove, and the cylindrical surface of the inner hole of the housing needle boss protrudes as an external tooth profile; the first driving main needle and the second driving main needle are respectively in interference fit with the first driving main needle retaining hole and the second driving main needle retaining hole, and the cylindrical surface of the first needle driving disc and the second needle driving disc protrudes as an internal tooth profile; the first driving main needle, the second driving main needle and the auxiliary needle form relative engagement sliding of the internal tooth profile and the external tooth profile; while being engaged, the first driving main needle, the second driving main needle and the auxiliary needle rotate and roll in the respective corresponding needle groove holes under the action of force, thereby completing the second-stage speed reduction.
[0013] Further, the planetary gears are in interference fit with the crank cam shaft, and the number N of the planetary gears ranges from 2 to 6.
[0014] Further, the number of the first driving main needle retaining holes and the second driving main needle retaining holes is less than the number of the auxiliary needle limiting grooves by i, and the number i ranges from 1 to 3.
[0015] Further, the polygonal shaft end of the crank cam shaft is in interference fit with the polygonal inner hole of the planetary gear, and the phase angles of the two coincide, the crank cam shaft is provided with a shaft snap spring groove, the first-stage speed reducer further comprises a shaft snap spring, the shaft snap spring is arranged in the shaft snap spring groove, and the planetary gear is limited by the shaft snap spring.
[0016] Further, the outer shell needle boss is provided with an auxiliary needle lubricating groove on both end faces, the end faces of the first needle driving disc and the second needle driving disc are provided with lubricating grease grooves, and the auxiliary needle lubricating groove and the lubricating grease groove are used to fill lubricating grease to form an end face oil film.
[0017] Further, the width β and the depth α of the auxiliary needle lubricating groove satisfy 1.5α≤β≤2.5α, and the relationship between the width b1 and the depth a1 of the lubricating grease groove satisfies
[0018] Further, a plurality of connecting skeletons are uniformly distributed on the output skeleton, the connecting skeletons are fixedly connected with the input connecting disc through a cylindrical positioning pin and a locking bolt, and an oil seal cover hole in the center of the output skeleton is provided with an oil seal cover for sealing grease.
[0019] Further, the input mounting end comprises a flange cover plate and a flange receiving plate, the flange cover plate is fixedly connected with the flange receiving plate, and the circumferences of the connection parts of the flange cover plate and the flange receiving plate are all milled and bored with square holes of the same size.
[0020] Further, the flange cover plate is provided with a first oil injection hole, a second oil injection hole and a sealing groove, the first oil injection hole and the second oil injection hole are convenient for discharging waste liquid inside the speed reducer and simultaneously convenient for adding lubricating grease inward, the sealing groove is convenient for connection and sealing of the flange receiving plate to prevent liquid leakage, the flange receiving plate is provided with a deep groove ball bearing hole and a second oil seal hole, the deep groove ball bearing hole and the second oil seal hole are convenient for assembly and pulling out of the input gear shaft without disassembly, and simultaneously convenient for confirming the installation direction of the input gear shaft and preventing leakage of lubricating grease.
[0021] Further, a plurality of avoiding holes are arranged on the first and second needle driving discs, the first inner bearing hole and the avoiding holes are spaced on the first needle driving disc, and the second inner bearing hole and the avoiding holes are spaced on the second needle driving disc.
[0022] The utility model discloses the beneficial effect lies in:
[0023] The utility model discloses a needle limit groove of shell mounting seat press in auxiliary needle to act as outer tooth profile, respectively in the first needle driving disc and second needle driving disc main needle keep hole press in drive main needle to act as inner tooth profile, when power is transmitted to crank cam axle by planetary gear, and is passed to the first needle driving disc and second needle driving disc by crank cam axle convex, make first drive main needle, second drive main needle respectively with different auxiliary needle meshing and form relative sliding, and meshing while first drive main needle, second drive main needle respectively with auxiliary needle under the action of force, in needle groove hole autorotation rolling. The needle driving disc of the utility model discloses with drive main needle, in the meshing part is replaced completely by needle standard spare with high precision, high hardness, high wear resistance, and cost is extremely low, and when under the stress, is split type and has autorotation rolling, makes it have stronger buffering effect, and the performance is more superior under the same working condition, and the life is longer. On the one hand, the part processing technology is simple, and the machining precision and the processing difficulty are reduced, and the processing equipment and the environmental requirement are reduced, and the overall cost is reduced, on the other hand, the easy damage part can be accurately replaced, and the maintenance cost is low. Meanwhile, the integral forming regular polygon axle end of the utility model discloses crank cam axle and the integral forming regular polygon inner hole interference fit of planetary gear, can avoid under the load impact, axial movement of planetary gear, leads to the loose and movement of crank cam axle in the inside of speed reducer, thereby guaranteeing that crank cam axle system is in the inside of speed reducer normal operation, improves the whole machine operation stable and life. BRIEF DESCRIPTION OF DRAWINGS
[0024] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or prior art, below will to the embodiment or prior art description needed to use the drawing briefly introduce, obviously, below description in the drawing is only the embodiment of the utility model, for the ordinary skilled person in the art comes, under the premise of not paying the creative labor, can also obtain other drawings according to the provided drawing.
[0025] Figure 1 The internal cross-sectional structure of the pure needle rolling and sliding type RV speed reducer and the assembly schematic diagram of each component are provided for the embodiments of the utility model.
[0026] Figure 2 The internal cross-sectional structure of the pure needle rolling and sliding type RV speed reducer and the assembly schematic diagram of each component are provided for the embodiments of the utility model.
[0027] Figure 3 This is a schematic diagram of the structure of the first needle roller drive disc in the pure needle roller sliding RV reducer provided in the embodiment of this utility model;
[0028] Figure 4 Schematic diagram of the output frame structure in the pure needle roller RV reducer provided in this embodiment of the utility model Figure 1 ;
[0029] Figure 5 Schematic diagram of the output frame structure in the pure needle roller RV reducer provided in this embodiment of the utility model Figure 2 ;
[0030] Figure 6 This is a schematic diagram of the crank camshaft structure in a pure needle roller RV reducer provided in an embodiment of the present invention;
[0031] Figure 7 A schematic diagram of the planetary gear structure in a pure needle roller RV reducer provided in this embodiment of the utility model;
[0032] Figure 8 This is a schematic diagram of the flange cover plate in a pure needle roller sliding RV reducer provided in an embodiment of the present utility model;
[0033] Figure 9 This is a schematic diagram of the flange receiving plate in a pure needle roller sliding RV reducer provided in an embodiment of the present utility model;
[0034] Figure 10 A schematic diagram of the internal structure of the housing mounting base in the pure needle roller sliding RV reducer provided in this embodiment of the utility model;
[0035] Figure 11 A schematic diagram of the pure needle roller sliding motion principle in the pure needle roller sliding RV reducer provided in this embodiment of the utility model;
[0036] In the figure:
[0037] 100-input gear shaft, 101-housing mounting seat, 102-first needle drive disc, 103-second needle drive disc, 104-input connecting disc, 105-output framework, 106-first pre-press grommet, 107-crank cam shaft, 108-second pre-press grommet, 109-separation sheet, 110-planetary gear, 111-axle ring, 112-flange cover plate, 113-flange receiving plate, 114-oil seal cover, 115-framework oil seal, 116-first main bearing, 117-assistant needle, 118-first drive main needle, 119-second drive main needle, 120-second main bearing, 121-locking bolt, 122-cylindrical positioning pin, 123-first bearing grommet, 124-first tapered roller bearing, 125-first inner bearing, 126-second inner bearing, 127-second bearing grommet, 128-second tapered roller bearing, 129-first inner hole snap spring, 130-shaft snap spring, 131-first O-shaped sealing ring, 132-second O-shaped sealing ring, 133-deep groove ball bearing, 134-second inner hole snap spring, 135-second framework oil seal, 201-assistant needle limiting groove, 202-housing needle boss, 203-first main bearing hole, 204-second main bearing hole, 205-assistant needle lubricating groove, 301-avoidance hole, 302-first drive main needle retaining hole, 303-lubricating grease groove, 304-first inner bearing hole, 305-first needle drive disc phase angle mark point, 401-tapered roller bearing blind hole, 402-connecting framework, 403-first main bearing position, 404-oil seal cover hole, 405-output butt joint end, 501-first eccentric boss, 502-second eccentric boss, 503-first tapered roller bearing rod, 504-second tapered roller bearing rod, 505-regular polygon shaft end, 506-shaft snap spring groove, 507-crank cam shaft phase angle mark point, 601-regular polygon inner hole, 602-planetary gear phase angle mark point, 701-first oil injection hole, 702-second oil injection hole, 703-sealing groove, 704-deep groove ball bearing hole, 705-second oil seal hole, 706-flange receiving plate connecting part. DETAILED DESCRIPTION
[0038] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.
[0039] Refer to the drawings Figures 1-11The utility model provides a kind of pure needle roller rolling and sliding RV speed reducer, including shell mounting seat 101, first needle roller driving disc 102, second needle roller driving disc 103, input connecting disc 104, output framework 105, first pre-pressing gasket ring 106, crank camshaft 107, second pre-pressing gasket ring 108, partition sheet 109, planetary gear 110, shaft ring 111, flange cover plate 112, flange receiving plate 113, first-stage speed reducer and second-stage speed reducer. Shell mounting seat 101 two ends respectively have an integrally-formed first main bearing hole 203 and second main bearing hole 204, and integrally-formed shell needle roller boss 202 between two main bearing holes, to ensure that it has higher coaxiality, and by disposable clamping, utilize high-precision CNC machining center to drill the through hole of corresponding number, corresponding size and precision on shell needle roller boss 202 at one time, then utilize slow wire to cut off redundant material at one time, and then get the auxiliary needle roller limiting groove 201 on shell mounting seat 101, and process a circle of auxiliary needle roller lubricating groove 205 with αmm depth and β width on the end surface of shell needle roller boss 202, so that after installing first pre-pressing gasket ring 106 and second pre-pressing gasket ring 108, fill lubricating grease between first pre-pressing gasket ring 106 and auxiliary needle roller 117 end surface, between second pre-pressing gasket ring 108 and auxiliary needle roller 117 end surface, under the action of high-speed centrifugal force in load, lubricating grease in auxiliary needle roller lubricating groove 205 compensates pre-pressing gasket ring and auxiliary needle roller 117 end surface, so that pre-pressing gasket ring and auxiliary needle roller 117, auxiliary needle roller 117 and auxiliary needle roller lubricating groove 205 are evenly covered with a layer of oil film, play the role of sufficient lubrication and reduce wear.
[0040] Wherein the position of auxiliary needle roller lubricating groove 205 is: D1 is corresponding bearing site diameter, and D2 is shell needle roller boss 202 inner hole diameter;
[0041] The depth α of auxiliary needle roller lubricating groove 205 is: α0 is pre-pressing gasket ring thickness;
[0042] The width β of auxiliary needle roller lubricating groove 205 is: 1.5 α≤β≤2.5 α;
[0043] The first needle driving disc 102 is uniformly provided with a plurality of avoiding holes 301 and first inner bearing holes 304, and the number of avoiding holes 301 is the same as that of the first inner bearing holes 304. The number n of holes is determined according to actual application, and is generally between 2≤n≤6. The shape of the avoiding hole is obtained by intersecting two symmetric angles θ of two concentric circles and rounding R1 and R2. Meanwhile, a plurality of through holes with certain size and number are uniformly distributed on the outer edge of the first needle driving disc 102, and the first driving main needle retaining hole 302 is obtained by removing redundant material through wire cutting. A circle of lubricating grease groove 303 with a depth of α1 mm and a width of β1 is processed on the two end faces of the first needle driving disc 102, so that the first pre-pressing pad ring 106 and the first needle driving disc 102, the first driving main needle 118 and the first driving main needle retaining hole 302, and the first needle driving disc 102 and the separation sheet 109 are filled with lubricating grease. Under the action of high-speed centrifugal force in the load, the lubricating grease in the lubricating grease groove 303 compensates the end faces of the first pre-pressing pad ring 106 and the first needle driving disc 102, the first driving main needle 118 and the first driving main needle retaining hole 302, and the first needle driving disc 102 and the separation sheet 109, so that each of them is uniformly covered with an oil film, thereby achieving sufficient lubrication and reducing wear. The depth of the lubricating grease groove 303 is: b1 is the thickness of the driving disc; the width of the lubricating grease groove 303 is: β1≤β. A first needle driving disc phase angle mark 305 is made at the phase angle, so as to select and identify during assembly. In the example of the utility model, the second needle driving disc 103 has the same structure and size as the first needle driving disc 102, and the difference is that the second driving main needle retaining hole is distributed at a certain angle with the first driving main needle retaining hole 302.
[0044] The output framework 105 connection end is uniformly provided with a plurality of connection frameworks 402 and a plurality of conical roller bearing blind holes 401, which are staggered at a certain angle with the connection framework 402, and the number of connection frameworks 402 is the same as that of the conical roller bearing blind holes 401 and the first needle driving disc avoiding hole 301. An oil seal cover hole 404 is arranged at the center through hole for sealing oil and facilitating observation during assembly. The blind hole is arranged at the conical roller bearing in order to increase the overall tensile strength of the output framework 105 and reduce the oil leakage of the oil sealing device. When the conical roller bearing blind hole 401 is finished, the output framework 105 must be locked by the cylindrical positioning pin 122 and the locking bolt 121, the corresponding conical roller bearing blind hole 401 of the input connection disc 104 and the output framework 105 is marked and positioned once, and the coaxiality and position are ensured. Meanwhile, the first main bearing position 403 on the output framework 105 and the corresponding second main bearing position on the input connection disc 104 are clamped and finished at one time, so as to ensure the coaxiality.
[0045] The crank camshaft 107 has two eccentric bosses and is distributed at 180°, respectively, the first eccentric boss 501 and the second eccentric boss 502; and needs to clamp and process the first tapered roller bearing rod 503 and the second tapered roller bearing rod 504 at one time, to ensure the coaxiality thereof; and the second tapered roller bearing rod 504 is integrally formed with a regular polygonal shaft end 505 on one side, to ensure that the phase angle thereof coincides with the phase angle of the two eccentric bosses, and the corresponding position is marked with a crank camshaft phase angle mark point 507.
[0046] The input mounting end structure is composed of a flange cover plate 112 and a flange receiving plate 113. The flange cover plate 112 is designed with one or more first oil injection holes 701 at the outer edge, and is designed with a second oil injection hole 702 on the end face, so as to facilitate the discharge of waste liquid inside the speed reducer, and facilitate the internal injection of lubricating grease. The flange cover plate 112 is provided with a sealing groove 703 on the end face, so as to facilitate the connection of the flange receiving plate 113 while sealing, prevent liquid leakage, and square mill and bore the circumference of the connection part, which effectively reduces the weight of the part while not affecting the performance. The size of the connection part 706 of the flange receiving plate 113 is consistent with the size of the connection part of the flange cover plate 112, and the same square milling and boring processing is performed, so that the weight is reduced while the appearance of the two parts after assembly is consistent, has a whole sense, and is convenient for replacing the flange receiving plate 113 according to different motor sizes, and is convenient for replacing and assembling. The flange receiving plate 113 is designed with a deep groove ball bearing hole 704 for fixing the input gear shaft 100 and a second oil seal hole 705, so as to facilitate the assembly and pulling of the input gear shaft 100 without disassembly, and prevent the leakage of lubricating grease.
[0047] In the first main bearing hole 203 of the housing mounting seat 101, the first main bearing 116 is installed, the first main bearing hole 403 of the output frame 105 is installed into the inner hole of the first main bearing 116, the frame oil seal 115 is installed at the outer edge of the output butt joint end 405 of the output frame 105, and the second main bearing 120 is installed in the second main bearing hole 204. The first tapered roller bearing 124 is installed in the tapered roller bearing blind hole 401 of the output frame 105, the first tapered roller bearing rod 503 of the crank cam shaft 107 is installed in the inner hole of the first tapered roller bearing 124, the roller bearing is separated from the first eccentric boss 501 by the first bearing gasket ring 123, the first eccentric boss 501, the second eccentric boss 502 are respectively installed in the first inner bearing 125 and the second inner bearing 126, the outer edge of the first inner bearing 125 and the second inner bearing 126 is respectively installed in the first inner bearing hole 304 of the first needle drive disc 102 and the second inner bearing hole of the second needle drive disc 103, the second tapered roller bearing 128 is installed in the second tapered roller bearing rod 504 of the crank cam shaft 107, the second tapered roller bearing 128 is separated from the second eccentric boss 502 by the second bearing gasket ring 127, the outer edge of the second tapered roller bearing 128 is installed in the tapered roller bearing hole of the input connecting disc 104, and is limited by the first inner hole snap spring 129, and then the shaft ring 111 is installed at the end of the second tapered roller bearing rod 504; After the main body is assembled, the first O-shaped sealing ring 131 is installed in the O-shaped ring groove of the housing mounting seat 101, the flange cover plate 112 is installed at the input end of the housing mounting seat 101, the second O-shaped sealing ring is installed in the sealing groove 703 of the flange cover plate 112, and the deep groove ball bearing 133, the second inner hole snap spring 134 and the second frame oil seal 135 are installed in the deep groove ball bearing hole 704, the snap spring groove and the second oil seal hole 705 of the flange receiving plate 113 in turn.
[0048] The first stage reduction gear of the pure needle roller rolling and sliding type RV reduction gear mainly comprises an input gear shaft 100, a planetary gear 110, a crank cam shaft 107 and an axle clamp spring 130. The utility model designs a regular polygon inner hole 601 in the center of the planetary gear 110, compared with the traditional spline hole, the machining process is simple, the grinding is convenient, the high-precision control is realized, and the machining cost is reduced. The phase angle marking point 602 of the planetary gear is marked clearly, and the situation that the phase point is not marked clearly or is wrong in the machining process is reduced. The integral forming regular polygon shaft end 505 of the crank cam shaft 107 and the integral forming regular polygon inner hole 601 of the planetary gear 110 are pressed and assembled through interference fit, and the axle clamp spring 130 is used for limiting, so that the planetary gear 110 and the crank cam shaft 107 are integrated closely, the axial movement of the planetary gear 110 under the load impact can be avoided, the crank cam shaft 107 in the reduction gear is loose and moves, the normal operation of the crank cam shaft system in the reduction gear is ensured, the smooth operation and the service life of the whole machine are improved, power is transmitted to the crank cam shaft 107 through the meshing operation of the input gear shaft 100 and N (2 <= N <= 6) planetary gears 110, and the first stage reduction is completed.
[0049] The second-stage speed reducer is realized by the meshing movement of the inner tooth profile and the outer tooth profile, and specifically as follows: the auxiliary rolling needles 117 are pressed into the auxiliary rolling needle limiting grooves 201 uniformly arranged on the shell mounting base 101, the number of the auxiliary rolling needles 117 is equal to that of the auxiliary rolling needle limiting grooves 201, the lengths are the same, and the auxiliary rolling needles 117 are in interference fit with the auxiliary rolling needle limiting grooves 201, so that the cylindrical surface of the auxiliary rolling needle 117 protruding into the hole of the shell rolling needle boss 202 serves as the outer tooth profile. The first driving main rolling needles 118 are pressed into the first driving main rolling needle retaining holes 302 of the first rolling needle driving disc 102, the number of the first driving main rolling needles 118 is equal to that of the first driving main rolling needle retaining holes 302, the lengths are the same, and the first driving main rolling needles 118 are in interference fit with the first driving main rolling needle retaining holes 302, so that the cylindrical surface of the first driving main rolling needle 118 protruding to the outer edge of the first rolling needle driving disc 102 serves as the inner tooth profile. The same number of second driving main rolling needles 119 are pressed into the second driving main rolling needle retaining holes of the second rolling needle driving disc 103 in the same way. The number of the first driving main rolling needle retaining holes 302 of the first rolling needle driving disc 102 is less than that of the auxiliary rolling needle limiting grooves 201 on the shell mounting base 101 by i (1≤i<3). When the power is transmitted to the crank cam shaft 107 by the planetary gear 110, and then transmitted to the first rolling needle driving disc 102 and the second rolling needle driving disc 103 by the first eccentric boss 501 and the second eccentric boss 502 of the crank cam shaft 107 respectively, the different rolling needle units of the first driving main rolling needles 118, the second driving main rolling needles 119 and the auxiliary rolling needles 117 are simultaneously meshed, the relative meshing sliding of the inner tooth profile and the outer tooth profile is formed, and at the same time of meshing, the first driving main rolling needles 118, the second driving main rolling needles 119 and the auxiliary rolling needles 117 rotate and roll in the corresponding rolling needle groove holes under the action of force, as shown in FIG. 8, to realize the second-stage speed reduction. Figure 8 That is, the technical scheme replaces the traditional one-piece cycloid wheel by the combination of the rolling needle driving disc and the driving main rolling needle, and the meshing part is completely replaced by the rolling needle part with high precision, high hardness and high wear resistance, so that the cost is extremely low, the rolling needle part has strong buffering effect and lower running noise due to the split type and the self-rotating rolling. The first driving main rolling needles 118 and the second driving main rolling needles 119 are simultaneously meshed with more auxiliary rolling needles 117, and the overlapping coefficient is higher, so that the operation is more stable, the vibration amplitude is smaller, the performance is more superior under the same working condition, and the service life is longer. On the one hand, the part machining process is simple, the machining precision and difficulty are reduced, the machining equipment and environmental requirements are reduced, and the overall cost is reduced; on the other hand, the easy-to-damage part can be accurately positioned and replaced conveniently, and the maintenance cost is low.
[0050] The above only is the specific embodiment of the present application, the specific structure and the common knowledge of the scheme and the characteristics are not described too much. It should be pointed out that for the person skilled in the art, without departing from the structure of the present application, a number of variations and improvements can be made, which should also be regarded as the protection scope of the present application, which will not affect the effect and the practicality of the patent. The protection scope of the present application should be subject to the content of its claims, and the specific implementation mode and the like in the specification can be used to explain the content of the claims.
[0051] The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The same or similar parts between the various embodiments can be referred to each other. For the device disclosed by the embodiments, since it corresponds to the method disclosed by the embodiments, the description is relatively simple, and the related parts can be referred to the method part.
[0052] The above description of the disclosed embodiments enables a person skilled in the art to implement or use the present application. Various modifications of the embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A pure needle roller sliding RV reducer, characterized in that, include: The device includes a housing mounting base (101), an input mounting end, an output frame (105), a first speed reduction device, and a second speed reduction device; the output frame (105), the first speed reduction device, and the second speed reduction device are all installed inside the housing mounting base (101). The first-stage reduction device includes an input gear shaft (100), N planetary gears (110), and a crank camshaft (107). The input mounting end is used to fix the input gear shaft (100), and all N planetary gears (110) mesh with the input gear shaft (100). The input gear shaft (100) meshes with the N planetary gears (110) to transmit power to the crank camshaft (107) to complete the first-stage reduction. The second-stage reduction device includes a first needle roller drive disk (102), a second needle roller drive disk (103), an input connection disk (104), an auxiliary needle roller (117), a first drive main needle roller (118), and a second drive main needle roller (119); The input connection plate (104) and the output frame (105) are installed at both ends of the housing mounting base (101); the housing mounting base (101) has a coaxial first main bearing hole (203) and a second main bearing hole (204) at both ends, and a housing needle roller boss (202) is provided between the two holes. Multiple auxiliary needle roller limiting grooves (201) are evenly distributed on the housing needle roller boss (202). The first needle roller drive disk (102) and the second needle roller drive disk (103) are respectively disposed inside the housing mounting base (101). The first needle roller drive disk (102) and the second needle roller drive disk (103) have the same structural dimensions. The outer edges of the first needle roller drive disk (102) and the second needle roller drive disk (103) are evenly distributed with the same number of first driving master needle holding holes (302) and second driving master needle holding holes. The first driving master needle holding holes (302) and the second driving master needle holding holes are staggered to form multi-tooth overlapping meshing. The first driving master needle (118) is pressed into the first driving master needle holding hole (302), and the second driving master needle (119) is pressed into the second driving master needle holding hole. The number of the first driving master needle holding holes (302) and the second driving master needle holding holes is i fewer than the number of auxiliary needle roller limiting grooves (201). The crank camshaft (107) is provided with a first eccentric boss (501), a second eccentric boss (502), a first tapered roller bearing rod (503), and a second tapered roller bearing rod (504). The first eccentric boss (501) and the second eccentric boss (502) are symmetrically distributed at 180°. The first needle roller drive disc (102) is evenly distributed with a plurality of first inner bearing holes (304), and the second needle roller drive disc (103) is evenly distributed with a plurality of second inner bearing holes. The first eccentric boss (501) is bearing connected to the first inner bearing hole (304), and the second eccentric boss... The boss (502) is connected to the second inner bearing hole bearing; the first eccentric boss (501) and the second eccentric boss (502) drive the first needle roller drive disk (102) and the second needle roller drive disk (103) respectively; one end of the second tapered roller bearing rod (504) is provided with a regular polygonal shaft end (505), and the planetary gear (110) is interference-fitted with the regular polygonal shaft end (505) of the crank camshaft (107) through the regular polygonal inner hole (601); the first tapered roller bearing rod (503) and the second tapered roller bearing rod (504) are coaxial; The auxiliary needle roller (117) is interference-fitted with the auxiliary needle roller limiting groove (201) and protrudes from the cylindrical surface of the inner hole of the outer shell needle roller boss (202) as an external tooth profile; the first driving main needle roller (118) and the second driving main needle roller (119) are interference-fitted with the first driving main needle roller holding hole (302) and the second driving main needle roller holding hole respectively, and protrude from the cylindrical surfaces of the first needle roller driving disk (102) and the second needle roller driving disk (103) as internal tooth profiles; the first driving main needle roller (118), the second driving main needle roller (119) and the auxiliary needle roller (117) form a relative meshing sliding of internal tooth profiles and external tooth profiles. At the same time as meshing, the first driving main needle roller (118), the second driving main needle roller (119) and the auxiliary needle roller (117) rotate and roll in their respective corresponding needle roller slots under the action of force, completing the second stage of deceleration.
2. The pure needle roller sliding RV reducer according to claim 1, characterized in that, The planetary gear (110) is interference-fitted with the crank camshaft (107), and the number N of the planetary gear (110) ranges from 2 to 6.
3. The pure needle roller sliding RV reducer according to claim 1, characterized in that, The number of the first driving main needle holder hole (302) and the second driving main needle holder hole is i less than the number of the auxiliary needle limit groove (201), and the value range of the number i is: 1≤i<3.
4. A pure needle roller sliding RV reducer according to claim 1, characterized in that, The regular polygonal shaft end (505) of the crank camshaft (107) is press-fitted with the regular polygonal inner hole (601) of the planetary gear (110), and the phase angles of the two coincide. The crank camshaft (107) is provided with a circlip groove (506). The first-stage reduction device also includes a circlip (130), which is disposed in the circlip groove (506). The planetary gear (110) and the crank camshaft (107) are limited by the circlip (130).
5. A pure needle roller sliding RV reducer according to claim 1, characterized in that, The outer shell needle roller boss (202) has auxiliary needle roller lubrication grooves (205) machined on both ends; the first needle roller drive disk (102) and the second needle roller drive disk (103) are provided with lubricating grease grooves (303) on their end faces, and the auxiliary needle roller lubrication grooves (205) and the lubricating grease grooves (303) are used to fill lubricating grease to form an oil film on the end face.
6. A pure needle roller sliding RV reducer according to claim 5, characterized in that, The width β and depth α of the auxiliary needle roller lubrication groove (205) satisfy 1.5α ≤ β ≤ 2.5α; the relationship between the width b1 and depth a1 of the lubricating grease groove (303) satisfies 7. A pure needle roller sliding RV reducer according to claim 1, characterized in that, Multiple connecting frames (402) are evenly distributed on the output frame (105). The connecting frames (402) are fixedly connected to the input connecting plate (104) by cylindrical positioning pins (122) and locking bolts (121). An oil seal cap (114) is installed in the oil seal cap hole (404) at the center of the output frame (105) for sealing grease.
8. A pure needle roller sliding RV reducer according to claim 1, characterized in that, The input mounting end includes a flange cover plate (112) and a flange receiving plate (113). The flange cover plate (112) and the flange receiving plate (113) are fixedly connected. The circumference of the connection part between the flange cover plate (112) and the flange receiving plate (113) is milled in a square with the same size.
9. A pure needle roller sliding RV reducer according to claim 8, characterized in that, The flange cover plate (112) is provided with a first oil injection hole (701), a second oil injection hole (702), and a sealing groove (703). The first oil injection hole (701) and the second oil injection hole (702) facilitate the discharge of waste liquid inside the reducer and facilitate the addition of lubricating grease. The sealing groove (703) facilitates the connection and sealing of the flange receiving plate (113) to prevent leakage. The flange receiving plate (113) is provided with a deep groove ball bearing hole (704) and a second oil seal hole (705). The deep groove ball bearing hole (704) and the second oil seal hole (705) facilitate the assembly and removal of the input gear shaft (100) without disassembly and confirm the installation direction of the input gear shaft (100), while preventing lubricating grease leakage.
10. A pure needle roller sliding RV reducer according to claim 1, characterized in that, The first needle roller drive disk (102) and the second needle roller drive disk (103) are each provided with a plurality of clearance holes (301). The first inner bearing hole (304) and the clearance holes (301) are distributed at intervals on the first needle roller drive disk (102); the second inner bearing hole and the clearance holes (301) are distributed at intervals on the second needle roller drive disk (103).