Trochoidal speed reducer with spacers and having the same

Abstract

The application discloses a spacer, comprising a first surface and a second surface opposite to the first surface, the first surface and the second surface respectively having two opposite first roller accommodating grooves and two opposite second roller accommodating grooves, the first roller accommodating grooves and the second roller accommodating grooves of the first surface corresponding to the second roller accommodating grooves and the first roller accommodating grooves of the second surface, the spacer further defining a reference surface, the reference surface being perpendicular to a horizontal direction and passing through a maximum thickness center point of the spacer, the horizontal distance from the reference surface to the center of each first roller accommodating groove being different from the horizontal distance from the reference surface to the center of each second roller accommodating groove. By turning over the spacer, the distance between two adjacent rollers can be adjusted. In addition, the application further provides a cycloid speed reducer with the spacer.

Description

TECHNICAL FIELD

[0001] The present application relates to a spacer, in particular, a kind of cycloid reducer with the spacer. BACKGROUND

[0002] The roller screw, roller linear guide or roller bearing commonly used in precision machinery mainly uses multiple rollers as transmission interface, and an adjacent two rollers are usually provided with a spacer to avoid direct collision between adjacent two rollers and damage, and at the same time achieve the effect of reducing noise, such as US4,479,683 and US 9,995,340 patent documents disclose related structure design.

[0003] However, in order to adjust the distance between adjacent two rollers, the conventional method is usually to prepare at least two different thickness spacers, and to adjust the distance by replacing different thickness spacers, but the replacement process will consume more time, so it is more troublesome and inconvenient to assemble. In addition, multiple different thickness spacers need to be made into multiple different molds, so the manufacturing cost is also relatively high. SUMMARY

[0004] The main purpose of the present application is to provide a kind of spacer, which adjusts the distance between adjacent two rollers by using the distance difference between the center of different roller accommodating grooves and a reference surface, so as to reduce the assembly difficulty and save the manufacturing cost.

[0005] In order to achieve the above main purpose, the spacer of the present application comprises a first surface and a second surface opposite to the first surface, the first surface and the second surface respectively have two first roller accommodating grooves and two second roller accommodating grooves, each first roller accommodating groove of the first surface and each second roller accommodating groove of the first surface are staggered with respect to the center of the first surface, each first roller accommodating groove of the second surface and each second roller accommodating groove of the second surface are staggered with respect to the center of the second surface; In addition, each second roller accommodating groove of the second surface corresponds to each first roller accommodating groove of the first surface, and each first roller accommodating groove of the second surface corresponds to each second roller accommodating groove of the first surface, wherein the spacer of the present application further defines a reference surface, the reference surface is perpendicular to a horizontal direction and passes through a maximum thickness center point of the spacer, the horizontal distance from the reference surface to the center of each first roller accommodating groove is defined as L1, and the horizontal distance from the reference surface to the center of each second roller accommodating groove is defined as L2, both satisfy the following relationship: L1>L2, so that the spacer of the present application can change the distance between adjacent two rollers after being turned 90 degrees.

[0006] From the above, by turning the spacer of the present application, the spacer of the present application can adjust the distance between two adjacent rollers by the distance difference between the first roller accommodating groove, the second roller accommodating groove and the reference surface, which can effectively reduce the assembly time and does not need to make different molds, thus reducing the manufacturing cost.

[0007] Preferably, a first protrusion is adjacent between the first roller accommodating groove and the second roller accommodating groove of the first surface, and a second protrusion is adjacent between the first roller accommodating groove and the second roller accommodating groove of the second surface, each second protrusion one-to-one corresponds to each first protrusion; in addition, the maximum distance between the reference surface and the first protrusion is equal to the maximum distance between the reference surface and the second protrusion.

[0008] Preferably, L1 and L2 have a distance difference, which varies according to the size of the input flange or output flange used with the spacer of the present application, which is between 0.1mm-0.4mm in the embodiment.

[0009] Preferably, each first protrusion and each second protrusion has a round corner design, when the assembly position deviates, the spacer of the present application can automatically correct through each round corner.

[0010] Preferably, the cross-sectional shape of each first roller accommodating groove and the cross-sectional shape of each second roller accommodating groove are arc-shaped, and each first roller accommodating groove and each second roller accommodating groove have the same curvature. Therefore, when used with the roller, each first roller accommodating groove and each second roller accommodating groove will form a surface contact with the roller to provide a support effect for the roller.

[0011] Preferably, the cross-sectional shape of each first roller accommodating groove and the cross-sectional shape of each second roller accommodating groove are arc-shaped, and each first roller accommodating groove and each second roller accommodating groove have the same curvature. Therefore, when used with the roller, each first roller accommodating groove and each second roller accommodating groove will form a surface contact with the roller to provide a support effect for the roller.

[0012] Preferably, the outer periphery of the spacer also has four identification parts (such as grooves), each identification part corresponds to each first roller accommodating groove or each second roller accommodating groove in a one-to-one manner to facilitate user identification to improve assembly efficiency.

[0013] Preferably, the first surface and the second surface are penetrated by an oil storage groove for storing lubricating oil.

[0014] In another aspect, the present application provides a cycloid speed reducer, which comprises a housing, a rotating shaft, an input flange, an output flange, a speed reduction device, a plurality of rollers, and a plurality of aforementioned spacers. The rotating shaft is rotatably disposed in the housing and has an input end and an output end; the input flange is rotatably disposed at one end of the housing and rotatably assembled to the input end of the rotating shaft; the output flange is rotatably disposed at the other end of the housing and rotatably assembled to the output end of the rotating shaft, and is connected to the input flange; the speed reduction device has at least one cycloid gear and at least one Oldham coupling, the cycloid gear is eccentrically assembled to the rotating shaft, and the Oldham coupling is disposed between the cycloid gear and the input flange or between the cycloid gear and the output flange; each of the rollers is disposed between the housing and the input flange and between the housing and the output flange; each of the spacers is disposed between two adjacent rollers, each of the spacers supports one roller with the first roller receiving groove or the second roller receiving groove of the first surface, and each of the spacers supports another roller with the first roller receiving groove or the second roller receiving groove of the second surface. Therefore, when the cycloid gear is driven by the rotating shaft, it will produce cycloid rotation relative to the housing, and then drive the input flange and the output flange through the Oldham coupling, so that the input flange and the output flange rotate relative to the housing through the rollers, thereby achieving the effect of speed reduction.

[0015] The detailed structure, features, assembly or use of the spacer and the cycloid speed reducer with the spacer provided by the present application will be described in the following detailed description of embodiments. However, those skilled in the art should understand that the detailed description and the specific examples listed in the implementation of the present application are only used to illustrate the present application, and are not used to limit the scope of the patent application of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 A perspective view of the spacer of the first embodiment of the present application.

[0017] Figure 2 A perspective view of the spacer of the first embodiment of the present application from another angle.

[0018] Figure 3 A side view of the spacer of the first embodiment of the present application in a first use state.

[0019] Figure 4 A side view of the spacer of the first embodiment of the present application in a second use state.

[0020] Figure 5 A plan view of the spacer of the first embodiment of the present application, mainly showing the distance difference before and after turning 90 degrees.

[0021] Figure 6 A perspective view of a cycloid speed reducer of the present application.

[0022] Figure 7 A partial perspective exploded view of Figure 6

[0023] Figure 8 A perspective view of a cycloid speed reducer of the present application from another angle.

[0024] Figure 9 A partial perspective exploded view of Figure 8

[0025] Figure 10 A sectional view of a cycloid speed reducer of the present application.

[0026] Figures 11a-11c A perspective view of a spacer of the first embodiment of the present application used in cooperation with a roller, mainly showing different assembly modes of the roller.

[0027] Figure 12 A plan view of a spacer of the first embodiment of the present application used in cooperation with a roller in different use states.

[0028] Figure 13 A plan view of a combination of an output flange and a roller provided by the present application.

[0029] Figure 14 A partial enlarged view of Figure 13

[0030] Figure 15 A perspective view of a spacer of the second embodiment of the present application.

[0031] Figure 16 A side view of a spacer of the second embodiment of the present application.

[0032] REFERENCE NUMERALS

[0033] 10: spacer

[0034] 10’: spacer

[0035] 12: first surface

[0036] 14: second surface

[0037] 16: oil storage groove

[0038] 18: first roller accommodating groove

[0039] 20: second roller accommodating groove

[0040] 22: identification portion

[0041] 24: first protruding portion ​​​

[0042] 26: second protrusion

[0043] 27: bevel

[0044] 28: camber

[0045] 29: round corner

[0046] 30: cycloid reducer

[0047] 40: housing

[0048] 50: rotating shaft

[0049] 52: input end

[0050] 54: output end

[0051] 60: input flange

[0052] 62: first shaft hole

[0053] 64: first connecting column

[0054] 66: first bearing

[0055] 70: output flange

[0056] 72: second shaft hole

[0057] 74: second connecting column

[0058] 76: second bearing

[0059] 78: bolt

[0060] 80: speed reduction device

[0061] 82: cycloid wheel

[0062] 84: Oldham coupling

[0063] 86: needle roller

[0064] 90: roller

[0065] C: center point of maximum thickness of spacer

[0066] C1: center of first roller accommodating groove

[0067] C2: center of second roller accommodating groove

[0068] D1: maximum distance between reference surface and first protrusion

[0069] D2: maximum distance between reference surface and second protrusion

[0070] G: distance between adjacent two rollers

[0071] G1: Distance between the endpoints of two adjacent rollers

[0072] G2: Distance between the endpoints of two adjacent rollers

[0073] L1: Horizontal distance between the center of the first roller receiving groove and the reference plane

[0074] L2: Horizontal distance between the center of the second roller receiving groove and the reference plane

[0075] L3: Distance difference

[0076] P: Reference plane

[0077] S1: First usage state

[0078] S2: Second usage state

[0079] X: Horizontal direction Detailed Implementation

[0080] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0081] First, it should be noted that throughout this specification, including the embodiments described below and the claims in the patent application, all directional terms are based on the directions shown in the drawings. Second, in the embodiments and drawings described below, the same component reference numerals represent the same or similar components or their structural features.

[0082] Please refer to the appendix. Figure 1 and appendix Figure 2 The spacer 10 of the first embodiment of the present invention includes a first surface 12, a second surface 14 opposite to the first surface 12, and an oil reservoir 16 penetrating the first surface 12 and the second surface 14. The first surface 12 and the second surface 14 respectively have two opposing first roller receiving grooves 18 and two opposing second roller receiving grooves 20. In this embodiment, the cross-sectional shape of each first roller receiving groove 18 and the cross-sectional shape of each second roller receiving groove 20 are both arc-shaped, and each first roller receiving groove 18 and each second roller receiving groove 20 have the same curvature.

[0083] Please continue to refer to the appendix. Figure 1 and appendix Figure 2The two first roller receiving grooves 18 and the two second roller receiving grooves 20 on the first surface 12 are staggered relative to the center of the first surface 12. The two first roller receiving grooves 18 and the two second roller receiving grooves 20 on the second surface 14 are staggered relative to the center of the second surface 14. The two first roller receiving grooves 18 on the first surface 12 correspond to the two second roller receiving grooves 20 on the second surface 14, and the two second roller receiving grooves 20 on the first surface 12 correspond to the two first roller receiving grooves 18 on the second surface 14. Similarly, the arrangement of the two first roller receiving grooves 18 and the two second roller receiving grooves 20 on the first surface 12 differs by 90 degrees from the arrangement on the second surface 14.

[0084] To facilitate user identification of the locations of the first roller receiving groove 18 and the second roller receiving groove 20, four identification portions 22 (using grooves as an example, but not limited to grooves) can be further provided on the outer periphery of the spacer 10, as shown in the attached figure. Figure 1 and appendix Figure 2 As shown, each identification unit 22 corresponds to each of the first roller receiving groove 18 or each of the second roller receiving groove 20 in a one-to-one manner. In this embodiment, the identification units 22 correspond to the first roller receiving groove 18 in a one-to-one manner.

[0085] As attached Figure 3 To be continued Figure 5 As shown, the spacer 10 defines a reference plane P, which is perpendicular to a horizontal direction X and passes through the center point C of the maximum thickness of the spacer 10. Regarding the relationship between the reference plane P and the first surface 12, the horizontal distance between the reference plane P and the center C1 of the first roller receiving groove 18 is defined as L1, and the horizontal distance between the reference plane P and the center C2 of the second roller receiving groove 20 is defined as L2. The two satisfy the relationship L1>L2. Therefore, when the spacer 10 moves from the attached... Figure 3 The first usage state S1 shown is flipped 90 degrees to the position shown in the attached diagram. Figure 4 In the second usage state S2 shown, the distance between the reference surface P and the center of the roller 90 changes. The relationship between the reference surface P and the second surface 14 is similar and will not be elaborated further. Furthermore, the first surface 12 has a first protrusion 24 at the junction of the first roller receiving groove 18 and the second roller receiving groove 20. Similarly, as shown in the attached diagram... Figure 1 As shown, the first surface 12 has four first protrusions 24, and the second surface 14 has a second protrusion 26 at the junction of the first roller receiving groove 18 and the second roller receiving groove 20. Similarly, as shown in the attached figure... Figure 2 As shown, the second surface 14 has four second protrusions 26, each of which corresponds one-to-one with the first protrusion 24.

[0086] Please refer to the appendix. Figure 6To the attached Figure 10 The spacer 10 of the present application is mainly applied to a cycloid speed reducer 30, which comprises a housing 40, a rotating shaft 50, an input flange 60, an output flange 70, a speed reduction device 80, a plurality of rollers 90 and a plurality of spacers 10.

[0087] The rotating shaft 50 is rotatably arranged in the housing 40 and has an input end 52 and an output end 54.

[0088] The input flange 60 is arranged at one end of the housing 40. The central part of the input flange 60 has a first shaft hole 62, and the input flange 60 is sleeved on the input end 52 of the rotating shaft 50 by means of the first shaft hole 62, and a first bearing 66 is arranged between the input end 52 of the rotating shaft 50 and the input flange 60, so that the rotating shaft 50 and the input flange 60 relatively rotate through the first bearing 66. In addition, the input flange 60 has four first connecting columns 64 around the first shaft hole 62.

[0089] The output flange 70 is arranged at the other end of the housing 40. The central part of the output flange 70 has a second shaft hole 72, and the output flange 70 is sleeved on the output end 54 of the rotating shaft 50 by means of the second shaft hole 72, and a second bearing 76 is arranged between the output end 54 of the rotating shaft 50 and the output flange 70, so that the rotating shaft 50 and the output flange 70 relatively rotate through the second bearing 76. In addition, the inner circumferential surface of the output flange 70 has four second connecting columns 74 around the second shaft hole 72, and four bolts 78 are used to connect the four first connecting columns 64 of the input flange 60 and the four second connecting columns 74 of the output flange 70, so that the two are assembled together.

[0090] The speed reduction device 80 has two cycloid wheels 82, two Oldham couplings 84 and a plurality of needle rollers 86. The two cycloid wheels 82 are arranged side by side and are eccentrically sleeved on the central part of the rotating shaft 50, and the two cycloid wheels 82 are jointly arranged through the four second connecting columns 74 of the output flange 70; one Oldham coupling 84 is arranged between the input flange 60 and each cycloid wheel 82, and the other Oldham coupling 84 is arranged between the output flange 70 and each cycloid wheel 82; each needle roller 86 is arranged between the inner circumferential surface of the housing 40 and the outer circumferential surface of each cycloid wheel 82, so that each cycloid wheel 82 can stably act. Therefore, when each cycloid wheel 82 is driven by the rotating shaft 50, it will produce cycloid rotation relative to the housing 40, and then drive the input flange 60 and the output flange 70 through the Oldham couplings 84, so that the input flange 60 and the output flange 70 rotate relative to the housing 40, so as to achieve the effect of speed reduction.

[0091] Each roller 90 is disposed between the housing 40 and the input flange 60, and between the housing 40 and the output flange 70, serving as a transmission interface between the housing 40 and the input flange 60, and between the housing 40 and the output flange 70. It should be noted that the arrangement of the rollers 90 can be adjusted according to actual needs; for example, under normal operating conditions, they can be arranged in a manner similar to... Figure 11a The cross arrangement shown can be adjusted as follows if a higher radial load is required: some rollers 90 can be adjusted as shown in the attached diagram. Figure 11b The rollers are arranged as shown in the attached diagram. If a higher axial load is required, some rollers at 90° can be adjusted as shown in the attached diagram. Figure 11c Arranged as shown.

[0092] Each spacer 10 is disposed between two adjacent rollers 90. Since each spacer 10 can be flipped in two different use states, and the arrangement of each roller 90 can be selectively adjusted, each spacer 10 supports one roller 90 on one hand by the first roller receiving groove 18 or the second roller receiving groove 20 on the first surface 12, and supports the other roller 90 on the other hand by the second roller receiving groove 20 or the first roller receiving groove 18 on the second surface 14.

[0093] As described above, after the spacer 10 is installed, because the spacer 10 will cause a distance difference L3 between the rollers 90 on the same side and the rollers 90 on the other side under two different operating conditions, the spacer 10 can be manually rotated 90 degrees to adjust the spacing between two adjacent rollers 90 using the aforementioned distance difference L3. (See attached image) Figure 12 As shown, when the spacer 10 is in the first usage state S1, the distance between the leftmost end of the left roller 90 and the rightmost end of the right roller 90 is G1. When the spacer 10 is flipped to the second usage state S2, the distance between the leftmost end of the left roller 90 and the rightmost end of the right roller 90 is G2. The difference between G1 and G2 is twice the distance difference (2×L3). Therefore, the present invention does not require the use of spacers of different thicknesses for adjustment as in the prior art. Simply flipping it 90 degrees to different usage states achieves the effect of adjusting the spacing. This not only effectively reduces assembly time but also eliminates the need to manufacture multiple different molds, thus reducing manufacturing costs. Furthermore, each of the first protrusions 24 and each of the second protrusions 26 can have a rounded corner design 29 (as shown in the attached figure). Figure 3 and appendix Figure 4 As shown, when the assembly position of the spacer 10 is deviated, it can be automatically corrected through the rounded corners 29 without the need for manual adjustment.

[0094] On the other hand, the distance difference L3 generated by the spacer 10 in different use states will vary depending on the size of the input flange 60 or the output flange 70 used in combination. Please refer to the accompanying drawings Figure 13 and the accompanying drawings Figure 14 (in the accompanying drawings Figure 13 Take the output flange 70 as an example, the same applies to the input flange 60, which is not drawn here), assuming that the diameter of the output flange 70 is ψ and the distance between two adjacent rollers 90 is G, if the diameter ψ is smaller, the arrangement of the rollers 90 will need to make the distance G larger due to the curvature, on the contrary, if the diameter ψ is larger, the arrangement of the rollers 90 will also need to make the distance G smaller due to the curvature, that is, the distance G will change within a certain range in combination with the diameter ψ, in order to adapt to the change of the distance G, the distance difference L3 in this embodiment is between 0.1mm-0.4mm.

[0095] It should be noted here that the cross-sectional shape of the first roller accommodating groove 18 and the cross-sectional shape of the second roller accommodating groove 20 are not limited to arc shape, in the second embodiment of the present application, both are rounded triangular, similarly, both have two inclined surfaces 27 and an arc surface 28 connected between the two inclined surfaces 27, as shown in the accompanying drawings Figure 15 and the accompanying drawings Figure 16 , and the first roller accommodating groove 18 and the second roller accommodating groove 20 have the same size. Therefore, when used in combination with the rollers 90, line contact will be formed between the two inclined surfaces 27 and the rollers 90 to reduce the friction between them, and the stress concentration condition can be effectively prevented. The operation mode and the effects that can be achieved by the spacer 10' of the second embodiment of the present application are the same as those of the above-mentioned first embodiment, which will not be repeated here.

[0096] The above-described specific embodiments further illustrate the purpose, technical solutions and beneficial effects of the present application, it should be understood that the above-described is only a specific embodiment of the present application, and is not used to limit the present application, any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application, should be included in the protection scope of the present application.

Claims

1. A spacer comprising a first surface and a second surface opposite to the first surface, the first surface and the second surface each having two first roller accommodating grooves and two second roller accommodating grooves, each of the first roller accommodating grooves of the first surface and each of the second roller accommodating grooves of the first surface being staggered with respect to a center of the first surface, each of the first roller accommodating grooves of the second surface and each of the second roller accommodating grooves of the second surface being staggered with respect to a center of the second surface, each of the first roller accommodating grooves of the first surface corresponding to each of the second roller accommodating grooves of the second surface, and each of the second roller accommodating grooves of the first surface corresponding to each of the first roller accommodating grooves of the second surface, wherein, The spacer defines a reference plane perpendicular to a horizontal direction and passing through a maximum thickness center point of the spacer, a horizontal distance from the reference plane to a center of curvature of each first roller accommodating groove is defined as L1, and a horizontal distance from the reference plane to a center of curvature of each second roller accommodating groove is defined as L2, both satisfying the following relationship: L1>L2.

2. The spacer of claim 1, wherein, A first protrusion is adjacent between a first roller accommodating groove and a second roller accommodating groove of the first surface, a second protrusion is adjacent between a first roller accommodating groove and a second roller accommodating groove of the second surface, each second protrusion one-to-one corresponds to each first protrusion; a maximum distance between the reference plane and a first protrusion is equal to a maximum distance between the reference plane and a second protrusion.

3. The spacer of claim 1, wherein, A distance difference between L1 and L2 is between 0.1mm-0.4mm.

4. The spacer of claim 2, wherein, Each first protrusion and each second protrusion has a fillet, respectively.

5. The spacer of claim 1, wherein, A cross-sectional shape of each first roller accommodating groove and a cross-sectional shape of each second roller accommodating groove are both arc-shaped, and each first roller accommodating groove and each second roller accommodating groove have the same curvature.

6. The spacer of claim 1, wherein, A cross-sectional shape of each first roller accommodating groove and a cross-sectional shape of each second roller accommodating groove are both filleted triangular, and each first roller accommodating groove and each second roller accommodating groove have the same size.

7. The spacer of claim 1, further comprising four identification portions, each identification portion one-to-one corresponds to each first roller accommodating groove or each second roller accommodating groove.

8. The spacer of claim 7, wherein, Each identification portion is a groove.

9. The spacer of claim 1, further comprising an oil storage groove, the oil storage groove penetrating through a center of the first surface and a center of the second surface.

10. An orbiting type speed reducer, comprising: a housing; a rotating shaft rotatably arranged in the housing and having an input end and an output end; an input flange rotatably arranged at one end of the housing and rotatably assembled to the input end of the rotating shaft; an output flange rotatably arranged at the other end of the housing and rotatably assembled to the output end of the rotating shaft, and connected to the input flange; a speed reduction device having at least one orbiting wheel eccentrically assembled to the rotating shaft and at least one Oldham coupling arranged between the orbiting wheel and the input flange or between the orbiting wheel and the output flange; a plurality of rollers arranged between the housing and the input flange and between the housing and the output flange; and a plurality of spacers according to any one of claims 1-9, each spacer being arranged between two adjacent rollers, each spacer selectively supporting one roller with each first roller accommodating groove or each second roller accommodating groove of the first surface, and each spacer selectively supporting another roller with each first roller accommodating groove or each second roller accommodating groove of the second surface.

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