JP2014199127A - Eccentric oscillation type reduction gear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the wear of a positioning member of a roller member externally fit to a pin member in an early stage.SOLUTION: An eccentric oscillation type reduction gear 12 comprises: an inner tooth gear 14; an outer tooth gear 16; an input shaft (eccentric body shaft) 18; a flange member 36 arranged at one side of the outer tooth gear in the axial direction; a pin member 38 which is connected to the flange member, and penetrates a penetration hole 16A formed at the outer tooth gear; a roller member 40 externally fit to the pin member; and a front cover (cover member) 54 arranged at the other side of the outer tooth gear in the axial direction. A spacer 70 is arranged between the roller member 40 and the front cover 54, and the spacer 70 has a first contacting part 71 contacting with the front cover 54 and a second contacting part 70 contacting with the roller member 40. The second contacting part 72 contacts with a plane part 40B3 located between an internal peripheral side corner 40B1 and an external peripheral side corner 40B2 of a roller member end face 40B, and does not contact with the external peripheral side corner 40B2.

Description

  The present invention relates to an eccentric rocking type reduction gear.

  Patent Document 1 discloses an eccentric rocking type speed reducer.

  The reduction gear includes an internal gear, an external gear that is in mesh with the internal gear, and an eccentric body shaft that rotates the external gear in an eccentric manner.

  A flange member is disposed on one side in the axial direction of the external gear. A pin member that passes through a through hole provided in the external gear is connected to the flange member. A roller member for promoting sliding between the pin member and the external gear is fitted on the pin member.

  A cover member that covers the axial side portion of the reduction gear is disposed on the other axial side portion of the external gear. A positioning plate (spacer member) is interposed between the cover member and the roller member, and the position of the roller member in the axial direction is regulated by the positioning plate.

  With this configuration, the reduction gear of Patent Document 1 takes out the relative rotation between the internal gear and the external gear as an output of the reduction gear via the roller member and the pin member.

JP 2009-204156 A

  However, in the eccentric oscillating speed reduction device having such a structure, there is a problem that the positioning plate that restricts the position of the roller member in the axial direction is easily worn by the contact of the roller member.

  The present invention has been made to solve such a conventional problem, and can prevent the positioning member of the roller member externally fitted to the pin member from being worn out at an early stage. An object of the present invention is to provide an eccentric oscillating type reduction gear.

  The present invention includes an internal gear, an external gear that meshes with the internal gear, an eccentric body shaft that rotates the external gear in an eccentric manner, and an axially one side portion of the external gear. A flange member, a pin member connected to the flange member and penetrating through a through hole provided in the external gear, a roller member externally fitted to the pin member, and an axial direction of the external gear And a cover member disposed on the other side, wherein the spacer member is disposed between the roller member and the cover member, and the spacer member contacts the cover member. A first contact portion; and a second contact portion that contacts the roller member. The second contact portion includes an inner peripheral side corner portion and an outer peripheral side corner portion on the cover member side end surface of the roller member. In contact with the flat portion between the two and not in contact with the outer corner. With, in which the above-mentioned problems are eliminated.

  The present invention has been made on the basis of the knowledge obtained as a result of investigating the mechanism by which the positioning member of the roller member is worn early. In the present invention, a first contact portion that contacts the cover member and a second contact portion that contacts the roller member are formed on the spacer member, and the second contact portion is an inner peripheral side angle of the cover member side end surface of the roller member. It is comprised so that it may contact the plane part between a part and an outer peripheral side corner | angular part, and it should especially be kept from contacting an outer peripheral side corner | angular part.

  With this configuration, wear of the spacer member can be further suppressed.

  ADVANTAGE OF THE INVENTION According to this invention, it can suppress that the positioning member of the roller member currently fitted by the pin member wears out early.

Sectional drawing which shows the structure of the eccentric rocking | fluctuation type deceleration device which shows an example of embodiment of this invention FIG. 1 shows the spacer of FIG. 1 as a single unit, (A) sectional view, (B) perspective view, (C) perspective view from another angle. Enlarged sectional view of the roller member near the front cover side end surface FIG. 2 is an enlarged sectional view corresponding to FIG. 2 showing an example of another embodiment of the present invention. FIG. 5 shows the spacer of FIG. 5 as a single unit, (A) sectional view, (B) perspective view, (C) perspective view from another angle.

  Hereinafter, an example of an embodiment of the present invention will be described in detail based on the drawings.

  FIG. 1 is a cross-sectional view showing a configuration of an eccentric oscillating speed reduction device 12 according to an example of an embodiment of the present invention, and FIG. 2 is an enlarged cross-sectional view of a main part of FIG.

  The reduction gear 12 includes an internal gear 14, an external gear 16 that is in mesh with the internal gear 14, and an input shaft (eccentric body shaft) 18 that eccentrically swings and rotates the external gear 16. The relative rotation generated between the internal gear 14 and the external gear 16 is taken out as an output. The speed reduction device 12 is an eccentric oscillating speed reduction device called a “central crank type” in which only one eccentric body shaft 18 exists in the radial center of the internal gear 14.

  Hereinafter, the configuration will be described in order from the input side.

  The input shaft 18 is integrated with the motor shaft 24 of the motor 22 (the motor shaft 24 also serves as the input shaft of the reduction gear 12). A vibration generating member 30 including two eccentric bodies 28 is connected to the input shaft 18 via a key 26. On the outer periphery of each eccentric body 28, the external gear 16 is incorporated via an eccentric body bearing 32 so as to be able to rotate eccentrically. That is, the input shaft 18 and the vibration generating member 30 are integrated to constitute an eccentric body shaft that rotates the external gear 16 in an eccentric manner. The external gear 16 is in mesh with the internal gear 14.

  In this embodiment, the internal gear 14 includes an internal gear main body 14A integrated with the casing 34, a columnar support pin 14B supported by the internal gear main body 14A, and an outer periphery of the support pin 14B. It is mainly composed of an outer roller 14 </ b> C that is rotatably incorporated and constitutes the internal teeth of the internal gear 14. The number of internal teeth of the internal gear 14 (the number of external rollers 14C) is slightly larger (only 1 in this example) than the number of external teeth of the external gear 16.

  A flange member 36 is disposed on one side of the external gear 16 in the axial direction. A press-fitting hole 36A is formed in the flange member 36, and a pin member 38 is fitted and connected to the press-fitting hole 36A by press-fitting. The pin member 38 passes through a through hole 16 </ b> A provided in the external gear 16. A roller member 40 is slidably fitted (externally fitted) on the outer periphery of the pin member 38. A gap corresponding to twice the amount of eccentricity of the eccentric body 28 is secured between the roller member 40 and the through hole 16 </ b> A of the external gear 16.

  The flange member 36 is integrated with an output shaft portion 44 with a further reduced shaft diameter via an intermediate portion 42 with a further reduced shaft diameter. The roller member 40, the pin member 38, the flange member 36, the intermediate portion 42, and the output shaft portion 44 constitute a large output member 46 that rotates integrally. The output member 46 is rotatably supported by the casing 34 via two output bearings 48 and 50 at the intermediate portion 42 and the output shaft portion 44.

  The casing 34 includes a casing main body 34A located in the center in the axial direction, a front cover (cover member) 54 that supports the motor shaft 24 (input shaft 18) on the opposite load side of the casing main body 34A, and a load on the casing main body 34. And an end cover 56 that supports the output member 46 on the side. The front cover 54 is disposed on one side of the external gear 16 and constitutes a part of the casing 34 of the reduction gear 12 and also serves as a part of the motor casing. The motor shaft 24 (input shaft 18) is supported by input bearings 60 and 62 disposed on the front cover 54 and the flange member 36, respectively.

  Here, the configuration related to the axial positioning of the roller member 40 will be described in detail with reference to FIGS. 2 and 3 together. 2 is an enlarged cross-sectional view of the main part of FIG. 1, FIG. 3 shows the spacer of FIG. 1 as a single unit, (A) cross-sectional view, (B) perspective view, (C) perspective view from another angle. FIG.

  As already described, the roller member 40 is externally fitted to the outer periphery of the pin member 38 that passes through the through hole 16A of the external gear 16. The roller member 40 is not fixed to the pin member 38 and can slide in the circumferential direction with respect to the pin member 38 and can also move in the axial direction.

  40 A of flange member side end surfaces of the roller member 40 are in contact with the flange member 36. Specifically, it is in contact with the outer peripheral portion of the press-fitting hole 36A for the pin member 38 on the end surface 36B of the flange member 36 on the axial external gear 16 side. As a result, the axial movement of the roller member 40 toward the load side is restricted.

  On the other hand, a spacer (spacer member) 70 is disposed between the roller member 40 and the front cover 54. The spacer 70 includes a first contact portion 71 that contacts the front cover 54 and a second contact portion 72 that contacts the roller member 40. The second contact portion 72 is a plane between the inner peripheral side corner portion 40B1 and the outer peripheral side corner portion 40B2 on the front cover side end surface 40B of the roller member 40 (cover member side end surface: hereinafter simply referred to as roller member end surface 40B). It is in contact with the portion 40B3. As a result, the axial movement of the roller member 40 toward the non-load side is restricted. The definitions of the inner peripheral side corner 40B1 and the outer peripheral side corner 40B2 will be described later.

  More specifically, the spacer 70 includes a ring-shaped main body portion 73 and pin corresponding portions 74 provided corresponding to the pin members 38 in the circumferential direction of the main body portion 73. Yes. Each pin corresponding portion 74 has the first contact portion 71 on one surface (surface on the front cover 54 side) and the second contact portion 72 on the other surface (surface on the roller member 40 side).

  The front cover 54 is provided with a cover protrusion 54A that contacts the spacer 70, and the first contact portion 71 is in contact with the cover protrusion 54A. Specifically, as shown in FIG. 4, the cover protrusion 54A is located between the pitch circle d5 and the circumscribed circle d7 of the pin member 38 in the radial direction, and protrudes in a ring shape toward the axial roller member 40 side. ing. The front end surface 54A1 of the cover protruding portion 54A is a plane perpendicular to the axis, and the first contact portion 71 contacts the flat surface portion 54A1a between the inner peripheral side corner 54A1b and the outer peripheral side corner 54A1c of the front end surface 54A1. It touches. Specifically, the inner and outer peripheral portions 71A and 71B of the axial cross section of the first contact portion 71 are formed in an arc shape, and as shown in FIG. The peripheral portions 71A and 71B have an arc shape concentric with the axis O1 of the internal gear 14, and are in contact with the cover protruding portion 54A only at the central flat portion 71C. That is, the first contact portion 71 is not in contact with the inner peripheral corner portion 54A1b and the outer peripheral corner portion 54A1c of the cover protrusion 54A.

  The first contact portion 71 and the second contact portion 72 of the spacer 70 are located between the roller member end surface 40B and the cover protruding portion 54A of the front cover 54 in the axial direction. However, the main body 73 of the spacer 70 almost entirely enters the inside of the cover protrusion 54A of the front cover 54, and overlaps the front cover 54 when viewed from the radial direction.

  A part 74 </ b> A of the pin corresponding portion 74 is fitted into the front end portion of the roller member 40 on the front cover 54 side by L <b> 2 (it is fitted into the inner periphery of the roller member 40). As described above, the pin member 38 and the roller member 40 fitted on the pin member 38 constitute a part of the output member 46. Therefore, the internal gear 14 has the same speed as that of the output shaft portion 44. , The spacer 70 can be rotated in synchronism with the revolving roller member 40. As a result, the pin corresponding portion 74 of the spacer 70 can be positioned in the circumferential direction and the radial direction following the rotation of each roller member 40. In other words, the spacer 70 according to the present embodiment has a plurality of roller members 40 (not by a regulation method in which the positions of the plurality of roller members 40 are collectively regulated within the range of the inscribed circle d8 and the circumscribed circle d9 of all the roller members 40). The position of each roller member 40 is individually regulated by the corresponding portion 74.

  In order to rotate the spacer 70 in synchronization with the revolution of the roller member 40, in addition to a configuration in which a part of the pin corresponding portion 74 is fitted in the inner periphery of the roller member 40, for example, (pin member 38 The outer gear 16 may be protruded from the front cover side end face 16B toward the front cover 54, and may be externally fitted to the outer periphery of the protruding pin member 38.

  In this embodiment, the second contact portion 72 has a circular (endless) ring shape.

  Specifically, the second contact portion 72 is configured as a ring-shaped protrusion that goes around the inner diameter D3 and the outer diameter d3, and is formed between the inner peripheral corner 40B1 and the outer peripheral corner 40B2 on the roller member end surface 40B. It is in contact with the plane part 40B3 between. As shown in FIG. 4, in this embodiment, the inner peripheral side of the roller member end surface 40B is subjected to chamfering processing of approximately 45 degrees, and the outer peripheral side is subjected to radius processing of radius r1. As described above, when the roller member end surface 40B is chamfered or rounded, the “corner portion” referred to here means “the intersection (intersection line between the chamfered or rounded portion and the flat portion 40B3). ) ". When the chamfering process or the rounding process is not performed, it indicates the “intersection (intersection line) between the outer circumference 40C or inner circumference 40D of the roller member 40 and the roller member end face 40B”. In short, the point (line) where the inner peripheral side of the roller member end surface 40B deviates from the plane including the flat surface portion 40B3 is the “inner peripheral side corner portion 40B1”, and the outer peripheral side of the roller member end surface 40B extends from the flat surface including the flat surface portion 40B3. It can be said that the point (line) to be removed is the outer peripheral side corner 40B2. That is, the “corner portion” is not necessarily 90 degrees in the axial section.

  The inner diameter D3 of the second contact portion 72 is set to a size larger than the diameter d2 of the inner peripheral side corner 40B1 in order to avoid contact with the inner peripheral side corner 40B1 on the roller member end surface 40B (D3> d2). The outer diameter d3 of the second contact portion 72 is set to be smaller than the diameter d4 of the outer peripheral corner portion 40B2 in order to avoid contact with the outer peripheral corner portion 40B2 on the roller member end surface 40B (d3 < d4). Thereby, the 2nd contact part 72 does not contact neither the inner peripheral side corner | angular part 40B1 nor the outer peripheral side corner | angular part 40B2. The tip 72A of the second contact portion 72 has a substantially semicircular shape in the axial cross section (the cross section passing through the axis O2 of the pin member 38). With this configuration, the second contact portion 72 is more reliably brought into contact only with the flat surface portion 40B3 between the inner peripheral side corner portion 40B1 and the outer peripheral side corner portion 40B2 on the roller member end surface 40B. By setting the shape of the tip 72A, the second contact portion 72 is reliably brought into contact with the flat surface portion 40B3 between the inner peripheral side corner portion 40B1 and the outer peripheral side corner portion 40B2 on the roller member end surface 40B, and in particular the outer periphery If a configuration that does not contact the side corner portion 40B2 can be realized, the relationship of D3> d2 and d3 <d4 does not necessarily hold. In short, in the present invention, it is particularly important that the second contact portion does not contact the outer peripheral corner portion, and if this is satisfied, the inner peripheral corner portion does not necessarily need to be in non-contact with the second contact portion. You may make it contact.

  Further, as described above, in the present embodiment, the chamfering process and the rounding process are performed on the inner peripheral side corner 40B1 and the outer peripheral side corner 40B2 of the roller member end surface 40B, respectively. Since the roller member end surface 40B does not come into contact with the inner peripheral side corner 40B1 and the outer peripheral side corner 40B2, the chamfering process of the inner peripheral side corner 40B1 of the roller member end surface 40B and the outer peripheral side corner 40B2 are not performed. The R process is not necessarily performed.

  The roller member end surface 40B is positioned L1 inside the front cover side end surface 16B of the external gear 16 in the axial direction, and the pin member 38 is positioned further L2 inward in the axial direction than the roller member end surface 40B. doing. In the present embodiment, the spacer 70 enters the through hole 16A of the external gear 16 using this difference L1, and, as described above, the difference between the pin corresponding portions 74 of the spacer 70 using the difference L2. A part 74 </ b> A enters the front end portion of the roller member 40 on the front cover 54 side (is fitted).

  In the present embodiment, the material of the spacer 70 is made of resin because the wear can be kept small due to its structure. However, it is not limited to resin, and may be formed of metal, for example.

  Next, the operation of the eccentric oscillating speed reduction device 12 according to this embodiment will be described.

  When the input shaft 18 of the speed reducer 12 integrated with the motor shaft 24 is rotated by the rotation of the motor shaft 24 of the motor 22, the vibration generating member 30 connected to the input shaft 18 through the key 26 is rotated. To do. When the vibration generating member 30 rotates, the eccentric body 28 formed integrally with the vibration generating member 30 rotates, and the input shaft (eccentric body shaft) 18 is rotated once through the eccentric body bearing 32. The external gear 16 rotates eccentrically once while being in mesh with the internal gear 14. As a result, the meshing position of the external gear 16 and the internal gear 14 sequentially shifts, and the external gear 16 has a difference in the number of teeth from the internal gear 14, that is, “one tooth”, It rotates relative to the internal gear 14 in a fixed state (rotates). This rotation component is transmitted to the flange member 36 disposed on the axial direction side portion of the external gear 16 through the roller member 40 and the pin member 38, and the output shaft portion 44 integrated with the flange member 36 rotates. To do. As a result, it is possible to achieve reduction with a reduction ratio corresponding to (the number of teeth difference between the internal gear 14 and the external gear 16: 1 in this example) / (the number of teeth of the external gear 16).

  As apparent from this power transmission mechanism, the roller member 40 transmits the relative rotational component of the external gear 16 with respect to the internal gear 14 to the pin member 38 on the outer periphery of the pin member 38 (the pin member 38). And the pin member 38 revolves around the axis O1 of the internal gear 14 while rotating. Therefore, conventionally, the member that positions the roller member 40 has a “ring-shaped wear portion” having a radial width corresponding to the outer diameter d1 of the roller member 40 along the revolution trajectory of the roller member 40. (The occurrence of a worn part was actually confirmed). In particular, as in this embodiment, in the case where the pin member 38 protrudes from the flange member 36 in a cantilever state, if a bending moment is applied to the pin member 38 due to a load applied during operation, the pin member 38 is externally fitted. Since the axial center of the roller member 40 is also tilted, the roller member end surface 40B is also tilted. Therefore, it is presumed that the influence of “galling” due to revolution was strong. This influence is particularly prominent due to the outer peripheral side corner 40B2 of the roller member end face 40B. In addition, the abrasion powder generated by this wear enters the sliding surface between the pin member 38 and the roller member 40, the rolling surface of the eccentric body bearing 32, etc., and adversely affects the sliding and rolling of these portions. There was also a larger secondary problem of giving.

  However, according to the present embodiment, the spacer 70 rotates in synchronization with the roller member 40 and has the first contact portion 71 that contacts the front cover 54 and the second contact portion 72 that contacts the roller member 40. And the 2nd contact part 72 is comprised so that the plane part 40B3 between inner peripheral side corner | angular part 40B1 and outer peripheral side corner | angular part 40B2 of roller member end surface 40B may be contacted. For this reason, the second contact portion 72 of the spacer 70 contacts only at the flat surface portion 40B3 of the roller member end surface 40B, and there is no contact at the “corner portion” (particularly, no contact at the outer peripheral side corner portion 40B2). In addition, since the phenomenon of “galling” due to revolution does not occur, the wear of the second contact surface 72 is suppressed and the generation of wear powder is small (in the case of this embodiment, non-contact at the outer peripheral corner 40B2 which has a great adverse effect) In addition, since non-contact at the inner peripheral side corner 40B1 is also maintained, “galling” is less likely to occur).

  Further, in the present embodiment, the front cover 54 has a cover protrusion 54A that contacts the spacer 70, and the first contact portion 71 of the spacer 70 is a flat portion between the corners of the cover protrusion 54A. 54A1a is contacted. Thereby, in this embodiment, generation | occurrence | production of abrasion powder can be suppressed as much as possible between the front cover 54 and the spacer 70.

  Further, in the present embodiment, the spacer 70 includes a ring-shaped main body portion 73 and pin corresponding portions 74 provided corresponding to the respective pin members 38 in the circumferential direction of the main body portion 73. A part of each pin corresponding portion 74 is configured to be fitted into the front end portion of the roller member 40 on the front cover 54 side by L2. Therefore, the spacer 70 can be rotated in synchronization with the revolution of the roller member 40 with a simple configuration, and the pin corresponding portion 74 can be accurately positioned with respect to the roller member end surface 40B of each roller member 40.

  Furthermore, in this embodiment, since one ring-shaped second contact portion 72 is provided on one surface of the pin corresponding portion 74, the spacer 70 contacts with “the entire circumference” of the roller member end surface 40 </ b> B. Therefore, even if a thrust load is applied between the roller member end surface 40B and the second contact portion 72 of the spacer 70 for some reason, a strong bending moment or the like is generated in the roller member 40. The roller member 40 can be smoothly rotated on the outer periphery of the pin member 38.

  Further, in the present embodiment, the spacer 70 is configured such that a part thereof enters the through hole 16A of the external gear 16 by L1. For this reason, since the through-hole 16A of the external gear 16 can be used as a guide at the time of assembly, the assemblability is improved, and the spacer 70 is inserted into the through-hole 16A of the external gear 16 by L2. Thus, the axial length of the speed reducer 12 can be shortened accordingly.

  Next, FIGS. 5 and 6 show an example of another embodiment of the present invention.

  5 and 6 also, the spacer 170 is disposed between the roller member 140 and the front cover 154, and the spacer 170 rotates in synchronization with the revolution of the roller member 140 and contacts the front cover 154. A first contact portion 171 that contacts the roller member 140, and a second contact portion 172 that contacts the roller member 140. Further, the second contact portion 172 is in contact with the flat surface portion 140B3 between the inner peripheral side corner portion 140B1 and the outer peripheral side corner portion 140B2 on the roller member end surface 140B. In particular, the second contact portion 172 is not in contact with the outer peripheral side corner portion 140B2. For this reason, similarly to the previous embodiment, it is possible to regulate the position of the roller member 140 in which the wear of the spacer 170 is suppressed, and to suppress the generation of wear powder.

  In this embodiment, one of the first contact portion 171 and the second contact portion 172 (in this example, the second contact portion 172) is radially inward from the outer periphery 173F of the main body portion 173 of the spacer 170, and the other ( In this example, the first contact portion 171) is configured to be provided on the outer side in the radial direction than the outer periphery 173F of the main body portion 173. That is, the first contact portion 171 and the second contact portion 172 do not overlap at all when viewed from the axial direction.

  As is clear from this example, the second contact portion (172) of the present invention does not necessarily have to be formed in a ring shape around the circumference. The configuration in which the first contact portion and the second contact portion are divided in the radial direction is such that the roller member end surface (140B) is on the front cover side of the external gear (116), as in the embodiment of FIGS. The end surface (116B) is flush with the front cover side end surface (116B) of the external gear (116) (not retracted inward as in the previous embodiment) or as in the present embodiment. This is particularly effective when protruding.

  If described based on the present embodiment, the first contact portion 171 is radially outward from the outer periphery 173F of the main body portion 173 of the spacer 170 and the second contact portion 172 is from the outer periphery 173F of the main body portion 173 as in the present embodiment. Since the second contact portion (72) that contacts the outer side in the radial direction of the roller member 140 can be omitted, the spacer 170 can be further disposed on the inner periphery of the roller member 140. It is possible to enter deeper (only L10 deeper than L2 in the example of FIG. 5). As a result, the axial length of the speed reducer 12 is maintained the same (for example, the distance L7 from the front cover side end surface 16B of the external gear 16 of FIG. 2 to the anti-external gear 16 side end surface of the front cover 54) 5, the axial length L11 of the pin member 138 and the axial length L12 of the roller member 140 can be secured longer while maintaining the same L7 in FIG. 5, and the power transmission with the external gear 116 can be further increased. It becomes possible to carry out smoothly.

  5 and 6, the first contact portion (171) of the main body portion (173) of the spacer (170) has a relationship with the radial position of the cover protrusion (154A). It is also possible to configure such that the second contact portion (172) is provided radially outside the outer periphery (173F) and the second contact portion (172) is provided radially outward from the outer periphery (173F) of the main body portion (173).

  In the above embodiment, the second contact portions 72 and 172 are both inner peripheral corner portions 40B1 and 140B1 and outer peripheral corner portions 40B2 of the roller member end faces (cover member side end faces of the roller member) 40B and 140B, It was comprised with the ring-shaped "projection part" which contacts the plane part 40B3 and 140B3 between 140B2. However, for example, as in the above embodiment, if the inner peripheral side corners 40B1 and 140B1 and the outer peripheral side corners 40B2 and 140B2 of the roller member end faces 40B and 140B are, for example, chamfered or rounded, than the flat portions 40B3 and 140B3. If the second contact portions 72 and 172 are not necessarily “projections” as a result, the second contact portions 72 and 172 of the spacers 70 and 170 are A configuration in which the flat surface portions 40B3 and 140B3 between the inner peripheral side corner portions 40B1 and 140B1 and the outer peripheral side corner portions 40B2 and 140B2 of the roller member end faces 40B and 140B are in contact (particularly a configuration not in contact with the outer peripheral side corner portions 40B2 and 140B2). ) Will be obtained. The present invention includes such a configuration. Incidentally, this situation is the same on the first contact portions 71 and 171 side.

  Since other configurations are the same as those of the previous embodiment, the same or functionally similar parts in the figure are given the same reference numerals in the last two digits as in the previous embodiment, and redundant description is omitted. .

DESCRIPTION OF SYMBOLS 12 ... Deceleration device 14 ... Internal gear 14A ... Internal gear main body 16 ... External gear 16A ... Through-hole 16B ... Front cover side end surface 18 ... Eccentric body axis (input shaft)
DESCRIPTION OF SYMBOLS 28 ... Eccentric body 32 ... Eccentric body bearing 34 ... Casing 36 ... Flange member 36B ... End surface by the side of an axial direction external gear 38 ... Pin member 40 ... Roller member 40A ... End surface of flange member side 40B ... End surface of roller member 40B1 ... Inner peripheral side Corner portion 40B2 ... Outer peripheral side corner portion 40B3 ... Planar portion 54 ... Front cover (cover member)
54A ... cover protrusion 70 ... spacer (spacer member)
71 ... 1st contact part 72 ... 2nd contact part 73 ... Main-body part 74 ... Pin corresponding part

Claims (8)

An internal gear, an external gear internally meshing with the internal gear, an eccentric body shaft for rotating the external gear in an eccentric manner, and a flange member disposed on one side in the axial direction of the external gear A pin member coupled to the flange member and penetrating through a through hole provided in the external gear, a roller member externally fitted to the pin member, and an axially other side portion of the external gear An eccentric oscillating type speed reducer comprising: a cover member disposed;
A spacer member is disposed between the roller member and the cover member,
The spacer member has a first contact portion that contacts the cover member, and a second contact portion that contacts the roller member,
The second contact portion is in contact with a flat portion between an inner peripheral side corner and an outer peripheral side corner on the cover member side end surface of the roller member, and is not in contact with the outer peripheral side corner. An eccentric oscillating speed reduction device. In claim 1,
The eccentric oscillating speed reduction device, wherein the second contact portion does not contact the inner peripheral side corner portion. In claim 1 or 2,
The cover member has a protruding portion that comes into contact with the spacer member,
The first contact part contacts a flat part between the corners of the projecting part. In any one of Claims 1-3,
The spacer member has a ring-shaped main body portion, and a pin corresponding portion provided corresponding to each of the pin members in the circumferential direction of the main body portion,
Each pin-corresponding portion is partially fitted into the tip end portion of the roller member on the cover member side. In claim 4,
The eccentric oscillating speed reduction device comprising the first contact portion on one surface of the pin corresponding portion and the second contact portion on the other surface. In claim 4 or 5,
An eccentric oscillating speed reduction device having an endless ring-shaped second contact portion on the other surface of the pin corresponding portion. In claim 4 or 5,
One of the first contact portion and the second contact portion is provided radially inward from the outer periphery of the main body portion of the spacer member, and the other is provided radially outward from the outer periphery of the main body portion. Swing type speed reducer. In any one of Claims 1-7,
The spacer member is partially inserted into the through-hole of the external gear.

Images