reducer

Abstract

A speed reducer is provided. The speed reducer (100) of the present application includes a housing (210), a gear carrier (220) held so as to be rotatable relative to the housing, including a first member (221) and a second member (222), and a support bolt (224) for assembling the first member and the second member, a deformation absorbing portion (290) being formed in a portion of an outer peripheral portion of the housing corresponding to a circumferential direction arrangement of the support bolt, the deformation absorbing portion (290) having an outer peripheral diameter smaller than an outer peripheral diameter of a circumferential portion of the outer peripheral portion other than the deformation absorbing portion in a state before the second member is fixed to the first member.

Description

Technical Field

[0001] This invention relates to a speed reducer.

[0002] This application claims priority based on Japanese Patent Application No. 2020-031514 filed on February 27, 2020 and Japanese Patent Application No. 2020-112889 filed on June 30, 2020, the contents of which are incorporated herein by reference. Background Technology

[0003] As described in Patent Document 1, reducers with a housing and a gear carrier are known. The gear carrier sometimes has components fastened by bolts.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 2016-109264 Summary of the Invention

[0007] The problem the invention aims to solve

[0008] However, in the structure described in Patent Document 1, there is a problem where, when a preload is applied during bolt fastening, the gear carrier expands and its external dimensions become larger than the specified tolerance. This causes a distortion in the roundness of the shape, with the shape near the bolt fastening protruding, resulting in a distortion of the reducer's shape and hindering the installation of the reducer itself.

[0009] Furthermore, when a tight preload range setting is required for bolt tightening to solve such problems, the following issues arise: the number of work steps increases, the work time increases, or the preload range cannot be set to a predetermined value according to the setting conditions of the reducer.

[0010] The present invention aims to provide a speed reducer that can prevent deformation of the outer diameter caused by bolt tightening.

[0011] Solution for solving the problem

[0012] The present invention provides a speed reducer that solves the above-mentioned problems by means of the following solution: the speed reducer comprises: a housing; a gear carrier, which is held to be rotatable relative to the housing, including a first member and a second member; and a support bolt for assembling the first member and the second member, wherein a deformation absorbing portion is formed in the circumferential portion of the outer periphery of the housing corresponding to the arrangement of the support bolt, and the outer circumferential diameter of the deformation absorbing portion is smaller than the outer circumferential diameter of the circumferential portion of the outer periphery other than the deformation absorbing portion in the state before the second member is fixed to the first member.

[0013] According to a certain technical solution of the present invention, when the first and second components are fastened with support bolts, the circumferential position of the gear carrier corresponding to the support bolts expands radially. This expansion is transmitted directly from the gear carrier to the housing, and the housing shape deforms by expanding its outer diameter. Therefore, the housing shape is distorted, and when the reducer is inserted, it is impossible to insert a portion whose diameter is larger than the diameter of the insertion part corresponding to the shape of the reducer.

[0014] In contrast, in this invention, a deformation-absorbing portion is provided to absorb the deformation of the housing and maintain its shape. Therefore, when inserting the reducer, the housing can be easily inserted into the insertion portion.

[0015] Furthermore, the radial expansion of the gear carrier caused by the tightening of the support bolts varies depending on the preload applied by the support bolts. In this invention, the radial expansion can be absorbed by the deformation-absorbing part, thus allowing for arbitrary setting of the preload.

[0016] It can be configured such that, when the first component and the second component are assembled using the support bolts, the deformation absorbing portion expands in the direction of diameter expansion.

[0017] It can be configured such that the deformation-absorbing portion has a flat surface shape that is parallel to the tangent of the outer periphery of the housing when viewed axially.

[0018] It can be configured such that the deformation-absorbing portion has a flat surface shape that is parallel to the tangent of the outer periphery of the housing when viewed axially, and whose outer diameter relative to the axis of rotation increases as it moves axially away from the end face of the housing.

[0019] It can be configured such that the deformation-absorbing portion is a notch formed on the outer periphery of the shell.

[0020] It can be configured such that when the first component and the second component are assembled using the support bolts, the deformation-absorbing portion expands in diameter and the outer periphery of the shell becomes circular.

[0021] It can be configured such that the deformation absorbing portion is formed to extend axially from the end face of the housing to the outer ring end face of the bearing portion supporting the gear carrier.

[0022] It can be configured such that the deformation-absorbing portion is formed as a flange portion extending axially from the end face of the housing to the outer periphery of the housing.

[0023] It can be configured such that the deformation-absorbing portion is formed in the circumferential region that is obscured by the bolt head of the support bolt when viewed radially from the rotation center of the gear carrier.

[0024] It can be configured such that a mark indicating the rotational position of the gear carrier is provided, which serves as the position of the deformation-absorbing part corresponding to the support bolt in the circumferential direction.

[0025] The present invention provides a speed reducer that solves the above-mentioned problems by means of the following solution: the speed reducer comprises: a housing; a gear carrier that is held to be rotatable relative to the housing, including a first member and a second member, having a first region and a second region in the circumferential direction; a support bolt for assembling the first member and the second member; and a deformation absorbing portion formed in the second region in the circumferential direction of the gear carrier, wherein the distance from the center of the gear carrier to the deformation absorbing portion is smaller than the radius of the portion of the gear carrier located in the first region.

[0026] According to a certain technical solution of the present invention, when the first and second components are fastened with support bolts, the circumferential position of the gear carrier corresponding to the support bolts expands radially. This expansion is transmitted directly from the gear carrier to the housing, and the housing shape deforms by expanding its outer diameter. Therefore, the housing shape is distorted, and when the reducer is inserted, it is impossible to insert a portion whose diameter is larger than the diameter of the insertion part corresponding to the shape of the reducer.

[0027] In contrast, in this invention, a deformation-absorbing portion is provided to absorb the deformation of the gear carrier and maintain its shape. Therefore, the housing does not expand, and the housing can be easily inserted into the insertion portion when the reducer is inserted.

[0028] Furthermore, the radial expansion of the gear carrier caused by the tightening of the support bolts varies depending on the preload applied by the support bolts. In this invention, the radial expansion can be absorbed by the deformation-absorbing part, thus allowing for arbitrary setting of the preload.

[0029] It can be configured such that, when the first component and the second component are assembled using the support bolts, the deformation absorbing portion expands in the direction of diameter expansion.

[0030] It can be configured such that the deformation-absorbing portion has a flat surface shape that is parallel to the tangent of the outer periphery of the gear carrier when viewed axially.

[0031] It can be configured such that the deformation-absorbing portion has a flat surface shape that is parallel to the tangent of the outer periphery of the gear carrier when viewed axially, and whose outer diameter relative to the axis of rotation increases as it moves axially away from the end face of the gear carrier.

[0032] It can be configured such that the deformation-absorbing portion is a notch formed on the outer periphery of the gear carrier.

[0033] It can be configured such that when the first component and the second component are assembled using the support bolts, the deformation-absorbing portion expands in diameter and the outer periphery of the gear carrier becomes circular.

[0034] It can be configured such that the deformation-absorbing portion is formed axially in the region corresponding to the bearing portion supporting the gear carrier and the housing.

[0035] It can be configured such that the deformation-absorbing portion is formed in the circumferential region that is obscured by the bolt head of the support bolt when viewed radially from the rotation center of the gear carrier.

[0036] The present invention provides a speed reducer that solves the above-mentioned problems by means of the following solution: the speed reducer comprises: a housing; a gear carrier, which is held to be rotatable relative to the housing, including a first member and a second member; a support bolt for assembling the first member and the second member; and an insert portion for inserting into the end side of the housing to mount the end side of the housing, wherein a deformation absorbing portion is formed at a portion of the insert portion located radially outward of the housing, at a circumferential position corresponding to the arrangement of the support bolt in the circumferential direction, and the portion having an inner circumferential diameter larger than the inner circumferential diameter of the circumferential portion at the inner circumferential position.

[0037] According to a reduction gear of the present invention, when the first and second components are fastened with support bolts, the circumferential position of the gear carrier corresponding to the support bolts expands radially. This expansion is transmitted directly from the gear carrier to the housing, and the housing shape deforms by expanding its outer diameter. Therefore, the housing shape deviates from a perfect circle, and when the reduction gear is inserted, it is impossible to insert a portion whose diameter is larger than the diameter of the insertion part corresponding to the shape of the reduction gear.

[0038] In contrast, in this invention, a deformation-absorbing portion is provided to absorb the deformation of the gear carrier and maintain its shape. Therefore, the housing does not expand, and the housing can be easily inserted into the insertion portion when the reducer is inserted.

[0039] Furthermore, the radial expansion of the gear carrier caused by the tightening of the support bolts varies depending on the preload applied by the support bolts. In this invention, the radial expansion can be absorbed by the deformation-absorbing part, thus allowing for arbitrary setting of the preload.

[0040] It can be configured such that, when the first component and the second component are assembled using the support bolts, the deformation absorbing portion expands in the direction of diameter expansion.

[0041] It can be configured such that the deformation-absorbing portion has a flat surface shape that is parallel to the tangent of the outer periphery of the housing when viewed axially.

[0042] It can be configured such that the deformation-absorbing portion has a flat surface shape that is parallel to the tangent of the outer periphery of the housing when viewed axially, and whose inner diameter relative to the axis of rotation increases toward the end face of the housing.

[0043] It can be configured such that the deformation-absorbing portion is a notch formed on the inner periphery of the embedded portion.

[0044] It can be configured such that the deformation-absorbing portion is formed axially in the region corresponding to the bearing portion supporting the gear carrier and the housing.

[0045] It can be configured such that the deformation-absorbing portion is formed in the circumferential region that is obscured by the bolt head of the support bolt when viewed radially from the rotation center of the gear carrier.

[0046] It can be configured such that a mark indicating the rotational position of the gear carrier is provided, which serves as the position of the deformation-absorbing part corresponding to the support bolt in the circumferential direction.

[0047] The effects of the invention

[0048] According to the present invention, a speed reducer is provided that absorbs the change in outer diameter caused by the expansion due to the tightening of the support bolts, and can be easily embedded in the embedding part. Attached Figure Description

[0049] Figure 1 This is a cross-sectional view along the axial direction showing the first embodiment of the speed reducer of the present invention.

[0050] Figure 2 This is an end view of the first embodiment of the reducer of the present invention, viewed from the axial direction.

[0051] Figure 3 This is an enlarged axial cross-sectional view showing the deformation absorption section in the first embodiment of the reducer of the present invention.

[0052] Figure 4This is an end view obtained by viewing the deformation absorption portion in the second embodiment of the reducer of the present invention from the axial direction.

[0053] Figure 5 This is an enlarged axial cross-sectional view showing the deformation absorption section in the second embodiment of the reducer of the present invention.

[0054] Figure 6 This is an enlarged axial cross-sectional view showing the deformation absorption section in the third embodiment of the reducer of the present invention.

[0055] Figure 7 This is an end view obtained by viewing the deformation absorption portion in the fourth embodiment of the reducer of the present invention from the axial direction.

[0056] Figure 8 This is an enlarged axial cross-sectional view showing the deformation absorption portion in the fourth embodiment of the reducer of the present invention.

[0057] Figure 9 This is an enlarged axial cross-sectional view showing the deformation absorption section in the fifth embodiment of the reducer of the present invention.

[0058] Figure 10 This is an enlarged axial cross-sectional view showing the deformation absorption section in the sixth embodiment of the reducer of the present invention.

[0059] Explanation of reference numerals in the attached figures

[0060] 100. Reducer; 210. Housing (outer cylinder); 210a. End face; 210b. Cylindrical part; 215. Flange (mounting flange); 220. Gear carrier (gear carrier); 221. Base (first component); 222. End plate (second component); 224. Support bolt (fixing bolt); 224a. Bolt head; 230. Main bearing; 290, 890. Deformation absorption part; F0. Central axis (main shaft); M. Mark; R1. Circumferential area (first area); R2. Circumferential area (second area). Detailed Implementation

[0061] Hereinafter, a first embodiment of the reducer of the present invention will be described based on the accompanying drawings.

[0062] Figure 1 This is a cross-sectional view along the axial direction of the reducer in this embodiment. Figure 2 This is an end view of the reducer in this embodiment, taken from an axial perspective. Figure 3 This is an enlarged cross-sectional view along the axial direction showing the deformation absorption section of the reducer in this embodiment. Figure 1 and Figure 2 In the attached diagram, reference numeral 100 indicates the speed reducer.

[0063] like Figures 1-3 As shown, the reducer 100 of this embodiment includes a housing cylinder 200, a gear section (external gear member) 300, and three crankshaft assemblies 400. The housing cylinder 200 houses the gear section 300 and the three crankshaft assemblies 400.

[0064] In this embodiment, the reducer 100 is configured as an eccentric oscillating reducer.

[0065] The housing 200 includes a shell (outer cylinder portion) 210, a gear carrier portion (gear carrier) 220, and two main bearings 230. The gear carrier portion 220 is disposed within the shell (outer cylinder portion) 210. The two main bearings 230 are disposed between the shell (outer cylinder portion) 210 and the gear carrier portion 220. The two main bearings 230 enable relative rotational movement between the shell (outer cylinder portion) 210 and the gear carrier portion 220. In this embodiment, the output portion of the reducer 100 is exemplified by either the shell (outer cylinder portion) 210 or the gear carrier portion 220.

[0066] exist Figure 1 The central axis (main shaft) F0 of the reducer 100 is defined as the rotation center axis of the two main bearings 230. With the housing (outer cylinder) 210 fixed, the gear carrier 220 rotates around the main shaft F0. With the gear carrier 220 fixed, the housing (outer cylinder) 210 rotates around the main shaft F0. That is, one of the housing (outer cylinder) 210 and the gear carrier 220 can rotate relative to the other about the main shaft F0.

[0067] In this embodiment, the direction along the central axis (main shaft) F0 of the reducer 100, which serves as the rotational center axis of the two main bearings 230, is referred to as the axial direction.

[0068] A flange (mounting flange) 215 is provided around the outer periphery of the cylindrical housing (outer cylinder portion) 210. A plurality of mounting holes 216 are formed at intervals around the periphery of the flange 215. The flange 215 serves, for example, as a mating part for inserting the reducer 100 into the insertion portion 800 (see reference). Figure 3 Use during installation.

[0069] The housing (outer cylinder) 210 includes an outer cylinder 211 and a plurality of internal toothed pins (internal teeth) 212. The outer cylinder 211 defines a cylindrical internal space for accommodating the gear carrier 220, the gear 300, and the crankshaft assembly 400. Each internal toothed pin 212 is a cylindrical member extending substantially parallel to the main shaft F0. Each internal toothed pin 212 is embedded in a groove formed in the inner wall of the outer cylinder 211. Thus, each internal toothed pin 212 is properly held by the outer cylinder 211.

[0070] Multiple internal toothed pins 212 are arranged around the main shaft F0 at approximately constant intervals. The semi-circular surface of each internal toothed pin 212 protrudes from the inner wall of the outer cylinder 211 toward the main shaft F0. Thus, the multiple internal toothed pins 212 function as internal teeth that mesh with the gear section 300.

[0071] The gear carrier portion 220 includes a base (first component) 221, an end plate portion (second component) 222, a locating pin 223, and a support bolt (fixing bolt) 224. The gear carrier portion 220 is generally cylindrical. A through hole 229 concentric with the main shaft F0 is formed in the gear carrier portion 220. The gear carrier portion 220 is held to rotate freely relative to the housing (outer cylinder portion) 210.

[0072] The base (first component) 221 includes a base plate portion 225 and three shaft portions 226. The three shaft portions 226 extend from the base plate portion 225 toward the end plate portion (second component) 222. A threaded hole 227 and a hinge hole 228 are formed on the top surface of each of the three shaft portions 226. A locating pin 223 is inserted into the hinge hole 228. As a result, the end plate portion (second component) 222 is positioned with good precision relative to the base (first component) 221.

[0073] The support bolt 224 is fastened to the threaded hole 227. As a result, the end plate portion (second component) 222 is properly fixed to the base portion (first component) 221.

[0074] The fastening between the base (first member) 221 and the end plate (second member) 222, achieved by the support bolt 224, is set in a predetermined preload manner. The end plate (second member) 222 is referred to as a retainer.

[0075] The gear portion 300 is disposed between the base plate portion 225 and the end plate portion (second member) 222. Three shaft portions 226 pass through the gear portion 300 and are connected to the end plate portion (second member) 222.

[0076] The gear section 300 includes two gears 310 and 320. Gear 310 is disposed between the base plate section 225 and gear 320. Gear 320 is disposed between the end plate section (second member) 222 and gear 310.

[0077] Gear 310 is approximately the same as gear 320 in shape and size. Gears 310 and 320 rotate within the outer cylinder 211 while meshing with the internal toothed pin 212. Thus, the center of gears 310 and 320 rotates around the main shaft F0.

[0078] The rotation phase of gear 310 deviates approximately 180° from the rotation phase of gear 320. During the period when gear 310 is engaged with half of the plurality of internal toothed pins 212 of housing (outer cylinder portion) 210, gear 320 is engaged with the remaining half of the plurality of internal toothed pins 212. Therefore, gear portion 300 is capable of rotating housing (outer cylinder portion) 210 or gear carrier portion 220.

[0079] In this embodiment, the gear unit 300 includes two gears 310 and 320. Alternatively, more than two gears may be used as the gear unit. Furthermore, as an alternative gear unit, a single gear may be used.

[0080] Each of the three crankshaft assemblies 400 includes a crankshaft 410, four bearings 421, 422, 423, and 424, and a transmission gear (external gear) 430. The transmission gear 430 can also be a conventional spur gear. For the reducer 100 of this embodiment, the transmission gear 430 is not limited to a specific type.

[0081] The transmission gear 430 is directly or indirectly subjected to the driving force generated by a drive source (e.g., a motor). The reducer 100 can appropriately set the transmission path of the driving force from the drive source to the transmission gear 430 according to its operating environment and operating conditions. Therefore, this embodiment is not limited to a specific drive transmission path from the drive source to the transmission gear 430.

[0082] exist Figure 1 The center represents the crankshaft axis (transmission axis) F2. The transmission axis F2 is approximately parallel to the main shaft F0. The crankshaft 410 rotates about the transmission axis F2.

[0083] The crankshaft 410 includes two journals (crankshaft journals) 411 and 412 and two eccentric portions (eccentric bodies) 413 and 414. Journals 411 and 412 extend along the transmission axis F2. The central axis of journals 411 and 412 coincides with the transmission axis F2. Eccentric portions 413 and 414 are formed between journals 411 and 412. Eccentric portions 413 and 414 are eccentric relative to the transmission axis F2.

[0084] Journal 411 is inserted into bearing 421. Bearing 421 is disposed between journal 411 and end plate portion (second member) 222. Therefore, journal 411 is supported by end plate portion (second member) 222 and bearing 421. Journal 412 is inserted into bearing 422. Bearing 422 is disposed between journal 412 and base portion (first member) 221. Therefore, journal 412 is supported by base portion (first member) 221 and bearing 422.

[0085] In this embodiment, bearing 421 is a needle roller bearing, with a plurality of needle rollers 431 arranged around journal 411. Bearing 422 is a needle roller bearing, with a plurality of needle rollers 432 arranged around journal 412.

[0086] An eccentric portion 413 is inserted into a bearing 423. The bearing 423 is positioned between the eccentric portion 413 and the gear 310. An eccentric portion 414 is inserted into a bearing 424. The bearing 424 is positioned between the eccentric portion 414 and the gear 320.

[0087] In this embodiment, bearing 423 is a needle roller bearing, and a plurality of needle rollers 433 are arranged around the eccentric portion (eccentric body) 413. Bearing 424 is a needle roller bearing, and a plurality of needle rollers 434 are arranged around the eccentric portion (eccentric body) 414.

[0088] If driving force is input to the transmission gear 430, the crankshaft 410 rotates about the transmission axis F2. As a result, the eccentric portions 413 and 414 rotate eccentrically about the transmission axis F2. The gears 310 and 320, connected to the eccentric portions 413 and 414 by means of bearings 423 and 424, oscillate within the circular space defined by the housing (outer cylinder) 210. The gears 310 and 320 mesh with the internal toothed pin 212, thus causing relative rotational motion between the housing (outer cylinder) 210 and the gear carrier 220.

[0089] For the reducer 100 in this embodiment, such as Figures 1-3 As shown, a deformation-absorbing portion 290 is formed on the outer periphery of the housing (outer cylinder portion) 210. The outer circumferential diameter of the deformation-absorbing portion 290 is smaller than the outer circumferential diameter of the circumferential portion of the outer periphery of the housing (outer cylinder portion) 210 excluding the deformation-absorbing portion 290. The deformation-absorbing portion 290 functions as a relief portion for absorbing and mitigating the expansion of the end plate portion (second member) 222 caused by the tightening of the support bolts 224. The deformation-absorbing portion 290 is formed in the circumferential direction of the housing (outer cylinder portion) 210 in the outer peripheral region of the housing (outer cylinder portion) 210 corresponding to the arrangement of the support bolts 224. In this embodiment, the deformation-absorbing portion 290 is formed as a small-diameter portion. A mark M is formed at the circumferential center of the deformation-absorbing portion 290, and a corresponding mark M is also formed on the gear carrier portion 220 at a position equidistant from the two support bolts 224.

[0090] Among them, such as Figure 2As shown, the area corresponding to the configuration of the support bolt 224 is formed inside the circumferential region R2 in the circumferential direction, which is obscured by the bolt head 224a of the support bolt 224 when viewed radially from the main shaft F0, which is the rotation center of the gear carrier (gear carrier) 220. In other words, the area including the bolt head 224a in the circumferential direction, obtained by extending the two tangents drawn from the main shaft F0 to the bolt head 224a, is designated as the circumferential region (second region) R2. The area excluding the bolt head 224a in the circumferential direction, obtained by extending the two tangents drawn from the main shaft F0 to the bolt head 224a, is designated as the circumferential region (first region) R1.

[0091] In this embodiment, the two support bolts 224 are set as a group. Therefore, the circumferential region R2 is set in such a way that the arc length of the outer periphery of the shell (outer cylinder) 210 is maximized by the tangent drawn to the bolt head 224a of the two support bolts 224.

[0092] Furthermore, the number of support bolts 224 is not limited to this; it can be one or more.

[0093] In this embodiment, such as Figure 2 As shown, the deformation-absorbing portion 290 is formed in the circumferential direction to be a region smaller than the circumferential region R2. That is, the deformation-absorbing portion 290 is formed such that its circumferential length is at most the same as the circumferential length of the circumferential region R2. Furthermore, depending on the preload value set when the support bolt 224 is tightened into the threaded hole 227, the size of the reducer 100, etc., the deformation-absorbing portion 290 can be formed such that its circumferential length is a predetermined value smaller than the circumferential length of the circumferential region R2.

[0094] The deformation absorption section 290 is configured as a plane parallel to the main shaft F0. In addition, the deformation absorption section 290 is formed relative to the outer periphery of the circular shell (outer cylinder section) 210 at a position parallel to the tangent of the outer periphery of the circular shell (outer cylinder section) 210.

[0095] The outer diameter of the housing (outer cylinder portion) 210 can also be formed as a perfect circle. In this specification, a perfect circle refers to a shape obtained by incorporating deformation that expands the outer diameter of the housing (outer cylinder portion) 210 due to the expansion caused by the tightening of the support bolts 224. Specifically, the outer shape of the housing (outer cylinder portion) 210 is defined as a continuous and strain-free circle, allowing the housing (outer cylinder portion) 210 to be easily inserted into the insert portion 800.

[0096] The deformation-absorbing part 290 is configured to be parallel to a tangent line that is tangent to the outer periphery of the shell (outer cylinder part) 210, which is equidistant from the two support bolts 224.

[0097] Specifically, the deformation absorption portion 290 is formed by cutting the outer periphery of the cylindrical portion 210b of the shell (outer cylinder portion) 210, which is located near the end face 210a, more than the flange portion 215, into a flat surface.

[0098] A sealing groove 210c is formed along the entire outer circumference of the cylindrical portion 210b. Alternatively, the sealing groove 210c may also be formed on the flange portion 215 of the housing (outer cylindrical portion) 210. The depth dimension of the sealing groove 210c can be larger than the radial dimension of the deformation absorbing portion 290 of the housing (outer cylindrical portion) 210.

[0099] like Figure 3 As shown, the deformation absorption portion 290 is formed in the region extending from the end face 210a to the flange portion 215 in the direction along the main axis F0.

[0100] exist Figure 3 In the middle, it represents the cross section passing through the central position in the circumferential direction of the deformation-absorbing part 290 and the main shaft F0. The deformation-absorbing part 290, which is formed as a plane, is shaped with the support bolt 224 not tightened into the threaded hole 227.

[0101] In the reducer 100 of this embodiment, when the end plate portion (second member) 222 is fixed to the base portion (first member) 221, the support bolt 224 is fastened to the threaded hole 227.

[0102] The support bolt 224 is used to fasten the base (first member) 221 and the end plate (second member) 222 together with a predetermined preload.

[0103] As a result, the end plate portion (second member) 222 expands in a manner that increases its diameter. The expansion of the end plate portion (second member) 222 occurs at the circumferential position of the gear carrier portion 220 corresponding to the support bolt 224, that is, at the position inside the circumferential region R2 in the circumferential direction.

[0104] Specifically, such as in Figure 2 As indicated by the double-dotted line, the end plate portion (second member) 222 expands by increasing its diameter. Furthermore, for ease of understanding, in... Figure 2 The expansion state, represented by a double-dotted line, is described in terms of the enlarged expansion size, and is shown in a way that overlaps with the outer periphery of the gear carrier 220. The expansion relative to a perfect circle is on the order of a few μm to tens of μm.

[0105] Due to the expansion of the end plate portion (second component) 222, the housing (outer cylinder portion) 210 is expanded in diameter by being pressed by the main bearing 230. The pressed housing (outer cylinder portion) 210 deforms in such a way that its outer diameter expands. As a result, the housing (outer cylinder portion) 210 deviates from a perfect circle shape, and when the reducer 100 is inserted, it is impossible to insert a portion whose diameter is larger than that of the insert portion 800 corresponding to the shape of the reducer 100.

[0106] In contrast, in this embodiment, by forming a deformation-absorbing portion 290 with a flat surface shape parallel to the tangent of the outer periphery of the housing (outer cylinder portion) 210 when viewed axially, the deformation of the housing (outer cylinder portion) 210 caused by its fastening can be absorbed, thus maintaining the outer shape of the housing (outer cylinder portion) 210 in a perfectly circular shape. That is, the deformation-absorbing portion 290 is formed such that the radial thickness of the cylindrical portion 210b is thinnest at the circumferential center position of the deformation-absorbing portion 290, and the radial thickness of the cylindrical portion 210b increases from the circumferential center position towards the circumferential ends of the deformation-absorbing portion 290, thereby being able to cope with the deformation of the gear carrier portion 220 caused by the expansion during the fastening of the support bolt 224. In other words, a deformation-absorbing portion 290 with an outer circumferential diameter smaller than the outer circumferential diameter of the circumferential portion at the inner circumferential position is formed at the following inner circumferential position, which is radially outer of the portion of the housing 210 corresponding to the arrangement of the support bolt 224 in the circumferential direction.

[0107] Therefore, in the reducer 100 of this embodiment, when the end plate portion (second member) 222 is fixed to the base portion (first member) 221, the shape of the housing (outer cylinder portion) 210 is deformed in such a way that the deformation absorption portion 290 expands in diameter.

[0108] Therefore, since the outer cylinder portion 210 does not have a portion whose diameter is larger than that of the circular insert portion 800, the outer cylinder portion 210 can be easily inserted into the insert portion 800 when the reducer 100 is inserted.

[0109] Furthermore, in this embodiment, the deformation-absorbing portion 290 is not limited to a planar shape. As long as it can absorb the deformation caused by the expansion during the tightening of the support bolts 224 and make the outer shape of the shell (outer cylinder portion) 210 perfectly round, a shape other than that can be used. For example, the deformation-absorbing portion 290 can be made into a curved surface shape corresponding to a gentle arc formed by the portion located in the center of the circumferential direction bulging outward in the radial direction compared to the portions located at both ends. Alternatively, in order to cope with a large preload, the deformation-absorbing portion 290 can be made into a curved surface shape corresponding to a gentle arc formed by the portion located in the center of the circumferential direction concave in the radial direction compared to the portions located at both ends.

[0110] Furthermore, in this embodiment, the deformation-absorbing portion 290 is formed in the region extending from the end face 210a to the flange portion 215 along the direction of the main shaft F0. Since the deformation-absorbing portion 290 can absorb the deformation caused by the expansion during the tightening of the support bolt 224 to insert the housing (outer cylinder portion) 210 into the insert portion 800, the length of the deformation-absorbing portion 290 is not limited to the length in the main shaft F0 direction; it can be formed along the length of the main shaft F0 direction. For example, it can be formed along the length of the main shaft F0 direction including the main bearing 230, which transmits the expansion from the gear carrier portion 220 to the housing (outer cylinder portion) 210. Therefore, the housing (outer cylinder portion) 210 can be easily inserted into the insert portion 800.

[0111] In this embodiment, the deformation-absorbing portion 290 may also be located at a position corresponding to the support bolt 224 in the circumferential direction, that is, in the area where the deformation-absorbing portion 290 is obscured by the support bolt 224 when viewed radially outward from the main shaft F0. In this case, deformation caused by expansion during the tightening of the support bolt 224 can be absorbed, allowing the housing (outer cylinder portion) 210 to be inserted into the insert portion 800. Therefore, the deformation-absorbing portion 290 can be formed to be included inside the circumferential region R2 in the circumferential direction. Furthermore, in this embodiment, the deformation-absorbing portion 290 is formed in a manner smaller than the circumferential region R2, but the deformation-absorbing portion 290 may also have a circumferential length that is the same as the circumferential length of the circumferential region R2.

[0112] In this embodiment, corresponding marks M are formed at the circumferential center of the deformation-absorbing portion 290 and at the outer peripheral position of the gear carrier portion 220, which is equidistant from the support bolt 224. This allows the rotational position of the gear carrier portion 220, which expands due to the tightening of the support bolt 224, to correspond to the circumferential position of the deformation-absorbing portion 290. Therefore, the deformation-absorbing portion 290 can absorb the expansion deformation of the gear carrier portion 220 caused by the tightening of the support bolt 224, allowing the housing (outer cylinder portion) 210 to be inserted into the insert portion 800.

[0113] Hereinafter, a second embodiment of the reducer of the present invention will be described based on the accompanying drawings.

[0114] Figure 4 This is an end view of the reducer in this embodiment, taken from an axial perspective. Figure 5 This is an enlarged cross-sectional view along the axial direction showing the deformation absorption section of the reducer in this embodiment. In this embodiment, the difference from the first embodiment described above lies in the points related to the deformation absorption section. Other structures that correspond to the structure of the first embodiment described above are labeled with the same reference numerals, and their descriptions are omitted.

[0115] In the reducer 100 of this embodiment, the deformation absorption portion 290 is a notch formed on the outer periphery of the housing (outer cylinder portion) 210.

[0116] In this embodiment, such as Figure 4 , Figure 5 As shown, the cylindrical portion 210b is formed intermittently in the circumferential direction, and the removed portion of the cylindrical portion 210b is designated as the deformation absorption portion 290.

[0117] In this embodiment, the deformation absorption portion 290 also has a smaller circumferential dimension than the circumferential dimension of the circumferential region R2.

[0118] Furthermore, in this embodiment, the notch that is configured as the deformation absorption portion 290 is also formed to extend from the end face 210a to the flange portion 215 in the direction along the main axis F0. That is, the notch that is configured as the deformation absorption portion 290 has a bottom surface that is flush with the flange portion 215.

[0119] Furthermore, the notch that is designated as the deformation absorption part 290 has its circumferential ends positioned along the radial side.

[0120] In this embodiment, by forming a deformation-absorbing portion 290 as a notch formed in the cylindrical portion 210b, the deformation of the housing (outer cylindrical portion) 210 caused by its tightening can be absorbed, thus maintaining the outer shape of the housing (outer cylindrical portion) 210 in a perfect circular shape. In other words, by utilizing the deformation-absorbing portion 290 as a notch, the expansion of the gear carrier portion 220 caused by the tightening of the support bolt 224 will not cause it to contact the housing (outer cylindrical portion) 210 located radially outward; therefore, the outer shape of the housing (outer cylindrical portion) 210 will not deform from a perfect circular shape. Thus, deformation of the gear carrier portion 220 caused by the expansion during the tightening of the support bolt 224 can be accommodated.

[0121] Therefore, in the case where the end plate portion (second member) 222 is fixed to the base portion (first member) 221, the housing (outer cylinder portion) 210 does not have a portion whose diameter is larger than that of the circular insert portion 800. When the reducer 100 is inserted, the housing (outer cylinder portion) 210 can be easily inserted into the insert portion 800.

[0122] Furthermore, in this embodiment, the deformation-absorbing portion 290, which is provided with a notch, is formed in the region from the end face 210a to the flange portion 215 in the direction along the main shaft F0. The deformation-absorbing portion 290 can be formed along the length of the main shaft F0 direction, provided that the deformation caused by the expansion during the tightening of the support bolt 224 is not transmitted to the housing (outer cylinder portion) 210 and the housing (outer cylinder portion) 210 can be inserted into the insert portion 800. For example, it can be formed along the length of the main shaft F0 direction including the main bearing 230, which transmits expansion from the gear carrier portion 220 to the housing (outer cylinder portion) 210. Therefore, the housing (outer cylinder portion) 210 can be easily inserted into the insert portion 800.

[0123] Furthermore, for the cylindrical portion 210b, the amount of deformation is small in the region near the flange portion 215 where the rigidity is high. Therefore, it is preferable to set the formation range of the deformation absorption portion 290 along the direction of the main axis F0 with consideration of reducing the amount of deformation.

[0124] In this embodiment, the deformation-absorbing portion 290, which is a notch, can also be located at a position corresponding to the support bolt 224 in the circumferential direction, that is, in the area where the deformation-absorbing portion 290 is obscured by the support bolt 224 when viewed radially outward from the main shaft F0. In this case, deformation caused by expansion during the tightening of the support bolt 224 can be prevented from being transmitted to the housing (outer cylinder portion) 210, and the housing (outer cylinder portion) 210 can be inserted into the insert portion 800. Therefore, the deformation-absorbing portion 290 can be formed to be included inside the circumferential region R2 in the circumferential direction. Furthermore, in this embodiment, the deformation-absorbing portion 290 is formed in a manner smaller than the circumferential region R2, but the deformation-absorbing portion 290 can also have a circumferential length that is the same as the circumferential length of the circumferential region R2.

[0125] In this embodiment, corresponding marks M are formed at the circumferential center of the deformation-absorbing portion 290 and at the outer peripheral position of the gear carrier portion 220, which is equidistant from the support bolt 224. This allows the rotational position of the gear carrier portion 220, which expands due to the tightening of the support bolt 224, to correspond to the circumferential position of the deformation-absorbing portion 290. Consequently, the deformation-absorbing portion 290 prevents the expansion deformation of the gear carrier portion 220 caused by the tightening of the support bolt 224 from being transmitted to the housing (outer cylinder portion) 210, and allows the housing (outer cylinder portion) 210 to be inserted into the insert portion 800.

[0126] In this embodiment, the same effect as the above-described embodiment can be achieved.

[0127] Hereinafter, a third embodiment of the reducer of the present invention will be described based on the accompanying drawings.

[0128] Figure 6This is an enlarged sectional view along the axial direction showing the deformation absorption section of the reducer in this embodiment. In this embodiment, the difference from the first and second embodiments described above lies in the points related to the deformation absorption section. Other structures that correspond to the structures in the first and second embodiments described above are labeled with the same reference numerals, and their descriptions are omitted.

[0129] In the reducer 100 of this embodiment, the deformation absorption portion 290 is formed as a cone shape that is inclined relative to the main shaft F0.

[0130] Specifically, similar to the first embodiment described above, the deformation-absorbing portion 290 has a planar shape that is parallel to the tangent to the outer periphery of the housing (outer cylinder portion) 210 when viewed along the direction of the main axis F0, but as... Figure 6 As shown, it has a flat surface shape with an outer diameter from the main axis F0 that increases as it moves away from the end face 210a in the direction of the main axis F0.

[0131] In this embodiment, the deformation absorption portion 290 also has a smaller circumferential dimension than the circumferential dimension of the circumferential region R2.

[0132] In addition, in this embodiment, the deformation absorption portion 290 is also formed to extend from the end face 210a to the flange portion 215 in the direction along the main axis F0.

[0133] Furthermore, the deformation-absorbing portion 290 is aligned with the inner circumference of the flange portion 215 at a position away from the end face 210a in the direction of the main shaft F0.

[0134] In this embodiment, by forming a conical deformation-absorbing portion 290 in the cylindrical portion 210b, the deformation of the housing (outer cylindrical portion) 210 caused by the tightening of the support bolt 224 can also be absorbed, thereby maintaining the outer shape of the housing (outer cylindrical portion) 210 in a perfect circle.

[0135] In other words, the cylindrical portion 210b is formed such that its radial thickness is thinnest at the circumferential center of the deformation-absorbing portion 290, and increases from the circumferential center towards both circumferential ends. Furthermore, along the main shaft F0, the cylindrical portion 210b is formed such that its radial thickness is thinnest on the end face 210a side, and increases towards the flange portion 215. This allows it to cope with deformation of the gear carrier portion 220 caused by expansion during the tightening of the support bolt 224.

[0136] Furthermore, even if the expansion of the gear frame portion 220 due to the tightening of the support bolt 224 is greater than expected, the radial thickness of the cylindrical portion 210b is thinnest on the end face 210a side, thereby allowing at least the end face 210a of the cylindrical portion 210b to be inserted into the insert portion 800. As a result, the housing (outer cylinder portion) 210 can be easily inserted into the insert portion 800.

[0137] For the housing (outer cylinder portion) 210, the expansion amount is smaller in the region near the flange portion 215 where the rigidity is higher, and larger in the region near the end face 210a. In response to this uneven distribution (inclination) of the expansion amount according to the position in the direction of the main shaft F0, in this embodiment, the deformation absorbing portion 290 is formed in a conical shape, so that the insertion of the housing (outer cylinder portion) 210 into the insert portion 800 can be easily accommodated.

[0138] In this embodiment, the same effect as the above-described embodiment can be achieved.

[0139] Hereinafter, a fourth embodiment of the reducer of the present invention will be described based on the accompanying drawings.

[0140] Figure 7 This is an end view of the reducer in this embodiment, taken from an axial perspective. Figure 8 This is an enlarged sectional view along the axial direction showing the deformation absorption section of the reducer in this embodiment. The difference from the first to third embodiments described above lies in the points related to the deformation absorption section. Other structures that correspond to the structures in the first to third embodiments described above are labeled with the same reference numerals, and their descriptions are omitted.

[0141] In the reducer 100 of this embodiment, the deformation absorption portion 290 is formed on the inner circumferential surface of the cylindrical portion 210b. The deformation absorption portion 290 is formed such that the radial thickness of the cylindrical portion 210b is thinnest at the circumferential center position, and the radial thickness of the cylindrical portion 210b increases from the circumferential center position toward the circumferential ends.

[0142] Specifically, similar to the first embodiment described above, the deformation-absorbing portion 290 is formed as a curved surface that, when viewed along the direction of the main axis F0, is formed by an arc whose curvature is greater than that of the arc of the outer periphery of the shell (outer cylinder portion) 210. For example... Figure 8 As shown, the deformation absorption part 290 has a side surface that is a curved surface parallel to the main axis F0.

[0143] In this embodiment, the deformation absorption portion 290 also has a smaller circumferential dimension than the circumferential dimension of the circumferential region R2.

[0144] Furthermore, in this embodiment, the deformation absorbing portion 290 is also formed in the direction along the main shaft F0 to be larger than the area from the end face 210a to the flange portion 215, and is formed to have a size equal to the axial dimension of the main bearing 230. That is, the deformation absorbing portion 290 can have a bottom surface that is flush with the outer ring end face of the main bearing 230 in the direction along the main shaft F0.

[0145] Furthermore, the portion near the end face 210a in the direction of the main shaft F0 can also avoid forming a deformation-absorbing portion 290 at a position that does not contact the main bearing 230.

[0146] In this embodiment, by forming a deformation-absorbing portion 290 on the inner circumferential surface of the cylindrical portion 210b, the deformation of the gear carrier portion (gear carrier) 220 caused by the fastening of the support bolt 224 can be absorbed, thereby maintaining the outer shape of the housing (outer cylindrical portion) 210 in a perfect circular shape.

[0147] In other words, the cylindrical portion 210b is formed such that its radial thickness is thinnest at the circumferential center of the deformation-absorbing portion 290, and increases from the circumferential center towards both circumferential ends of the deformation-absorbing portion 290. This allows it to cope with the expansion of the main bearing 230 caused by the expansion of the gear carrier portion 220 due to the expansion during the tightening of the support bolts 224, which would otherwise cause the main bearing 230 to deform radially outward.

[0148] This prevents the outer shape of the housing (outer cylinder) 210 from deviating from a perfect circle, and allows the housing (outer cylinder) 210 to be easily inserted into the insert 800.

[0149] In this embodiment, the deformation absorption portion 290 can be formed only in the portion corresponding to the main bearing 230, which transmits the expansion to the housing (outer cylinder portion) 210.

[0150] Furthermore, the deformation-absorbing portion 290 of the present invention can also be formed in a cone shape as described in the third embodiment above.

[0151] In this embodiment, the same effect as the above-described embodiment can be achieved.

[0152] Hereinafter, a fifth embodiment of the reducer of the present invention will be described based on the accompanying drawings.

[0153] Figure 9 This is an enlarged axial cross-sectional view showing the deformation absorption section of the reducer in this embodiment. In this embodiment, the difference from the first to fourth embodiments described above lies in the points related to the deformation absorption section. Other structures that correspond to the structures in the first to fourth embodiments described above are labeled with the same reference numerals, and their descriptions are omitted.

[0154] For the reducer 100 in this embodiment, such as Figure 9 As shown, a deformation-absorbing portion 290 is formed on the outer periphery of the gear carrier portion (gear carrier) 220. The outer circumferential diameter of the deformation-absorbing portion 290 is smaller than the outer circumferential diameter of the circumferential portion of the gear carrier portion (gear carrier) 220 excluding the deformation-absorbing portion 290. The deformation-absorbing portion 290 is formed in the circumferential direction of the gear carrier portion (gear carrier) 220 in the outer peripheral region corresponding to the arrangement of the support bolt 224. The deformation-absorbing portion 290 is formed on the outer peripheral surface of the end plate portion (second member) 222 opposite to the main bearing 230.

[0155] The distance from the center of the gear carrier (gear carrier) 220 to the deformation absorption part 290 is smaller than the radius of the part of the gear carrier (gear carrier) 220 located in the first region R1.

[0156] In other words, the end plate portion (second component) 222 contacts the inner ring of the main bearing 230 over its entire circumference, but the end plate portion (second component) 222 is formed in such a way that only the portion corresponding to the deformation absorbing portion 290 does not contact the inner ring of the main bearing 230. Furthermore, the state in which the end plate portion (second component) 222 does not contact the inner ring of the main bearing 230 is the state in which the gear carrier portion (gear carrier) 220 is not assembled.

[0157] In this embodiment, the deformation-absorbing portion 290 is also formed inside the circumferential region R2 in the circumferential direction, which is covered by the bolt head 224a of the support bolt 224 when viewed radially from the main shaft F0, which is the rotation center of the gear carrier (gear carrier) 220. That is, the circumferential region R2 is defined as the area obtained by extending the two tangents drawn from the main shaft F0 to the bolt head 224a.

[0158] In this embodiment, the two support bolts 224 are set as a group. Therefore, the circumferential region R2 is set in such a way that the arc length of the outer periphery of the shell (outer cylinder) 210 is maximized by the tangent drawn to the bolt head 224a of the two support bolts 224.

[0159] In this embodiment, the deformation-absorbing portion 290 is also formed in the circumferential direction to be a region smaller than the circumferential region R2. That is, the deformation-absorbing portion 290 is formed such that its circumferential length is at most the same as the circumferential length of the circumferential region R2. Furthermore, depending on the preload value set when the support bolt 224 is tightened into the threaded hole 227, the size of the reducer 100, etc., the deformation-absorbing portion 290 can be formed such that its circumferential length is a predetermined value smaller than the circumferential length of the circumferential region R2.

[0160] The deformation-absorbing portion 290 is configured as a plane parallel to the main shaft F0. Furthermore, the deformation-absorbing portion 290 is arranged parallel to the tangent of the outer periphery of the circular gear carrier portion (gear carrier) 220. Specifically, the deformation-absorbing portion 290 is configured to be parallel to the tangent line that is equidistant from the outer periphery of the gear carrier portion (gear carrier) 220, which is also tangent to the tangent line.

[0161] Specifically, the deformation absorption section 290 is formed by cutting a planar area into the outer periphery of the end plate section (second member) 222, corresponding to the peripheral region R2.

[0162] like Figure 9 As shown, the deformation absorption portion 290 is formed in the region that contacts the main bearing 230 in the direction along the main shaft F0.

[0163] exist Figure 9 In the middle, it represents the cross-section of the central position of the deformation-absorbing part 290 in the circumferential direction and the main shaft F0. The deformation-absorbing part 290, which is formed into a flat surface, is shaped without the support bolt 224 being tightened into the threaded hole 227, that is, without applying preload.

[0164] In the reducer 100 of this embodiment, when the end plate portion (second member) 222 is fixed to the base portion (first member) 221, the support bolt 224 is tightened into the threaded hole 227.

[0165] The fastening between the base (first component) 221 and the end plate (second component) 222 by the support bolt 224 is to tighten the support bolt 224 in a manner with a predetermined preload.

[0166] As a result, the end plate portion (second member) 222 expands in a manner that increases its diameter. The expansion of the end plate portion (second member) 222 occurs at the circumferential position of the gear carrier portion 220 corresponding to the support bolt 224, that is, at the position inside the circumferential region R2 in the circumferential direction.

[0167] However, in this embodiment, by forming a deformation-absorbing portion 290 with a flat surface shape in the end plate portion (second member) 222, the deformation of the end plate portion (second member) 222 caused by its fastening can be absorbed and the shape of the end plate portion (second member) 222 can be maintained in a perfect circle.

[0168] In other words, the deformation-absorbing portion 290 is formed such that its radial dimension is largest at the circumferential center and decreases from the circumferential center towards both circumferential ends. This allows it to cope with deformation of the gear carrier portion 220 caused by expansion during the tightening of the support bolts 224.

[0169] Therefore, in the reducer 100 of this embodiment, when the end plate portion (second member) 222 is fixed to the base portion (first member) 221, the end plate portion (second member) 222 is deformed in such a way that the deformation absorption portion 290 expands the diameter and the outer shape of the end plate portion (second member) 222 corresponding to the main bearing 230 becomes a perfect circle.

[0170] Therefore, the expansion caused by the tightening of the support bolt 224 will not be transmitted to the housing (outer cylinder portion) 210 via the main bearing 230. As a result, the shape of the housing (outer cylinder portion) 210 will not deviate from a perfect circle, and since there is no part of the housing (outer cylinder portion) 210 with a diameter larger than that of the perfect circle insert portion 800, the housing (outer cylinder portion) 210 can be easily inserted into the insert portion 800 when the reducer 100 is inserted.

[0171] Furthermore, in this embodiment, the deformation-absorbing portion 290 is not limited to a planar shape. It can be any shape other than a planar shape, as long as it can absorb the deformation caused by the expansion during the tightening of the support bolts 224, resulting in a perfectly circular shape for the main bearing 230 and the housing (outer cylinder portion) 210. For example, the deformation-absorbing portion 290 can be a curved surface shape corresponding to a gentle arc formed by the portion located at the center in the circumferential direction bulging radially outward compared to the portions located at both ends. Alternatively, to cope with a large preload, the deformation-absorbing portion 290 can be a curved surface shape corresponding to a gentle arc formed by the portion located at the center in the circumferential direction concave radially inward compared to the portions located at both ends.

[0172] Furthermore, in this embodiment, the deformation-absorbing portion 290 is formed in the region corresponding to the main bearing 230 along the direction of the main shaft F0. However, as long as the deformation caused by the expansion during the tightening of the support bolt 224 can be absorbed to insert the housing (outer cylinder portion) 210 into the insert portion 800, the deformation-absorbing portion 290 can be formed along the length of the main shaft F0. For example, it can be formed in the direction of the main shaft F0 with a length dimension larger than that of the main bearing 230. As a result, the housing (outer cylinder portion) 210 can be easily inserted into the insert portion 800.

[0173] In this embodiment, the deformation-absorbing portion 290 may also be located at a position corresponding to the support bolt 224 in the circumferential direction, that is, in the area where the deformation-absorbing portion 290 is obscured by the support bolt 224 when viewed radially outward from the main shaft F0. This allows the housing (outer cylinder portion) 210 to be inserted into the insert portion 800 by absorbing deformation caused by expansion during the tightening of the support bolt 224. Therefore, the deformation-absorbing portion 290 can be formed to be contained within the circumferential region R2 in the circumferential direction. Furthermore, in this embodiment, the deformation-absorbing portion 290 is formed to be smaller than the circumferential region R2, but the deformation-absorbing portion 290 may also have a circumferential length equal to the circumferential length of the circumferential region R2.

[0174] Furthermore, the deformation-absorbing portion 290 of the present invention can also be formed in a cone shape as described in the third embodiment above.

[0175] In this embodiment, the same effect as the above-described embodiment can be achieved.

[0176] Hereinafter, a sixth embodiment of the reducer of the present invention will be described based on the accompanying drawings.

[0177] Figure 10 This is an enlarged axial cross-sectional view showing the deformation absorption section of the reducer in this embodiment. In this embodiment, the difference from the first to fifth embodiments described above lies in the points related to the deformation absorption section. Other structures that correspond to the structures in the first to fifth embodiments described above are labeled with the same reference numerals, and their descriptions are omitted.

[0178] For the reducer 100 in this embodiment, such as Figure 10 As shown, a deformation absorbing portion 890 is formed on the inner periphery of the insert portion 800, and the inner circumferential diameter of the deformation absorbing portion 890 is set to be larger than the inner circumferential diameter of the circumferential portion of the inner periphery of the insert portion 800. The deformation absorbing portion 890 is formed in the circumferential direction of the insert portion 800 in the inner peripheral region corresponding to the arrangement of the support bolt 224 when the reducer 100 is inserted.

[0179] In other words, the insert portion 800 is formed in such a way that its entire inner circumference contacts the outer circumference of the cylindrical portion 210b, but only the portion of the insert portion 800 corresponding to the deformation-absorbing portion 890 does not contact the cylindrical portion 210b. Furthermore, the state in which the insert portion 800 does not contact the cylindrical portion 210b is the state in which the gear carrier portion (gear carrier) 220 is not assembled.

[0180] In this embodiment, the deformation-absorbing portion 890 is also formed inside the circumferential region R2 in the circumferential direction, which is covered by the bolt head 224a of the support bolt 224 when viewed radially from the main shaft F0, which is the rotation center of the reducer 100. That is, the circumferential region R2 is defined as the area obtained by extending the two tangents drawn from the main shaft F0 to the bolt head 224a.

[0181] In this embodiment, the two support bolts 224 are set as a group. Therefore, the circumferential region R2 is set in such a way that the arc length of the outer periphery of the shell (outer cylinder) 210 is maximized by the tangent drawn to the bolt head 224a of the two support bolts 224.

[0182] In this embodiment, the deformation-absorbing portion 890 is also formed in the circumferential direction to be a region smaller than the circumferential region R2. That is, the deformation-absorbing portion 890 is formed such that its circumferential length is at most the same as the circumferential length of the circumferential region R2. Furthermore, depending on the preload value set when the support bolt 224 is tightened into the threaded hole 227, the size of the reducer 100, etc., the deformation-absorbing portion 890 can be formed such that its circumferential length is a predetermined value smaller than the circumferential length of the circumferential region R2.

[0183] The deformation-absorbing portion 290 is formed in such a way that the inner circumferential surface of the insert portion 800 is expanded. The deformation-absorbing portion 890 is formed such that the inner diameter of the insert portion 800 is largest at the circumferential center position of the deformation-absorbing portion 890, and the inner diameter of the insert portion 800 decreases from the circumferential center position of the deformation-absorbing portion 890 toward the circumferential ends.

[0184] Specifically, similar to the fourth embodiment described above, the deformation-absorbing portion 890 is formed as a curved surface formed by an arc whose curvature is greater than that of the outer periphery of the shell (outer cylinder portion) 210 when viewed along the direction of the main axis F0. The deformation-absorbing portion 890 is formed as a curved surface formed by an arc whose curvature is greater than that of the inner periphery of the embedded portion 800 when viewed along the direction of the main axis F0.

[0185] In this embodiment, by forming a deformation-absorbing portion 890 on the inner peripheral surface of the insert portion 800, the expansion of the housing (outer cylinder portion) 210 caused by the fastening of the support bolt 224 can be accommodated, and the housing (outer cylinder portion) 210 can be easily inserted into the insert portion 800.

[0186] Furthermore, in this embodiment, when the rotational position of the gear carrier portion 220 when inserted into the insert portion 800 is visually identified based on the position between the deformation absorption portion 890 formed on the inner peripheral surface of the insert portion 800 and the support bolt 224, it is also possible to omit at least one of the markings M.

[0187] In this embodiment, the same effect as the above-described embodiment can be achieved.

[0188] Furthermore, in this invention, other implementation methods can be applied by arbitrarily combining the structures in the above-described embodiments.

Claims

1. A speed reducer, wherein, This reducer has the following features: case; A gear carrier, which is held rotatable relative to the housing, includes a first member and a second member; and Support bolts, used to secure the second component to the first component. A deformation-absorbing portion is formed on the outer periphery of the housing in the circumferential direction corresponding to the arrangement of the support bolts. The outer circumferential diameter of this deformation-absorbing portion is smaller than the outer circumferential diameter of the circumferential portion of the outer periphery other than the deformation-absorbing portion before the second member is fixed to the first member. The deformation-absorbing section is formed in a cone shape that is inclined relative to the main shaft of the reducer. The deformation-absorbing part has a flat surface shape that is parallel to the tangent of the outer periphery of the shell when viewed axially.

2. The reducer according to claim 1, wherein, As the first and second components are assembled using the support bolts, the deformation-absorbing portion expands in the direction of diameter expansion.

3. The reducer according to claim 1 or 2, wherein, The deformation-absorbing portion has a flat surface shape that is parallel to the tangent of the outer periphery of the housing when viewed axially, and whose outer diameter relative to the axis of rotation increases as it moves axially away from the end face of the housing.

4. The reducer according to claim 1 or 2, wherein, The deformation-absorbing portion is a notch formed on the outer periphery of the shell.

5. The reducer according to claim 1 or 2, wherein, When the first component and the second component are assembled using the support bolts, the deformation-absorbing part expands in diameter and the outer periphery of the shell becomes circular.

6. The reducer according to claim 1 or 2, wherein, The deformation-absorbing portion is formed to extend axially from the end face of the housing to the outer ring end face of the bearing portion supporting the gear carrier.

7. The reducer according to claim 6, wherein, The deformation-absorbing portion is formed as a flange portion extending axially from the end face of the housing to the outer periphery of the housing.

8. The reducer according to claim 1 or 2, wherein, The deformation-absorbing portion is formed in the circumferential region that is obscured by the bolt head of the support bolt when viewed radially from the rotation center of the gear carrier.

9. The reducer according to claim 1 or 2, wherein, A mark is provided to indicate the rotational position of the gear carrier, which serves as the circumferential position of the deformation-absorbing part and the support bolt.

Images