JP2016098908A - Eccentric oscillating gear device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an eccentric oscillating gear device capable of suppressing a decrease in the service life.SOLUTION: An eccentric oscillating gear device X1 includes an outer cylinder 2, a carrier 4 having a first member 41 and a second member 42, a fastening member 5 having a head 52 pressing the first member 41 from a side opposite from the second member 42 and fastening the first member 41 and the second member 42, and a main bearing 9 having a second receiving surface 41G and at least a part thereof positioned within a length range of the fastening member 5 so as to allow relative rotation between the outer cylinder 2 and the carrier 4. The first member 41 includes a first contact surface 41C receiving fastening force of the fastening member 5 from the head 52, and a second contact surface 41D receiving the fastening force of the fastening member 5 from the second member 42, and in a fastening direction of the first member 41 and the second member 42 by the fastening member 5, the second receiving surface 41G is shifted to the fastening direction from a virtual intermediate surface S1 where the first contact surface 41C and the second contact surface 41D are in equal distance.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an eccentric oscillating gear device.

  As a conventional gear device, in Patent Document 1, as shown in FIG. 4, an internal gear 101, an external gear 102 that meshes with the internal gear 101, and a disk that sandwiches the external gear 102 from both sides in the axial direction. A planetary gear device 100 is described, which includes 103 and a support member 104, and a rolling element 105 disposed between the disc 103 and the internal gear 101. The rolling element 105 rolls in a state of being in contact with the rolling surface 103 a included in the outer peripheral surface of the disc 103, thereby allowing relative rotation between the disc 103 and the internal gear 101. The disc 103 and the support member 104 are fastened to each other by a fastening member 106. The fastening member 106 is inserted into the disc 103 and the support member 104 from the opposite side of the support member 104 in the axial direction of the external gear 102, and the head portion 106 a of the fastening member 106 presses the disc 103. . That is, the disk 103 has a contact surface 103 b that receives the fastening force of the fastening member 106 from the head portion 106 a and a contact surface 103 c that receives the fastening force of the fastening member 106 from the support member 104.

Japanese Patent Laid-Open No. 9-14359

  In the planetary gear device 100 of Patent Document 1, the disk 103 and the support member 104 are fastened by the fastening member 106, so that the disk 103 is located just between the contact surface 103b and the contact surface 103c in the axis C1 direction. The intermediate surface S1 is greatly deformed so as to bulge outward in the radial direction. For this reason, when the disc 103 and the support member 104 are fastened by the fastening member 106, the rolling surface 103a of the disc 103 located on the surface of the intermediate surface S1 is strongly pressed against the rolling element 105. Thereby, there exists a possibility that the lifetime of the planetary gear apparatus 100 may become short.

  The present invention has been made in view of the above points, and an object of the present invention is to provide an eccentric oscillating gear device that can prevent the life from being shortened.

  The eccentric oscillating gear device according to the present invention has an outer cylinder, a carrier having a first member and a second member, and a head for pressing the first member from the side opposite to the second member, A fastening member that fastens the first member and the second member; a receiving surface for receiving the rolling element by the first member; and at least a part of the fastening member positioned within a length range of the fastening member. A main bearing that allows relative rotation between the outer cylinder and the carrier, and the first member includes a first contact surface that receives a fastening force of the fastening member from the head, and the first member A second contact surface that receives a fastening force of the fastening member from two members, and the receiving surface has a first fastening direction in which the first member and the second member are fastened by the fastening member. From a virtual intermediate surface where the contact surface and the second contact surface are at an equal distance, It is located offset in the focusing direction.

  Generally, when the first member and the second member are fastened by the fastening member, the first member is likely to be greatly deformed so as to bulge outward in the radial direction on the intermediate surface. Therefore, in the eccentric oscillating gear device, the receiving surface is arranged so as to deviate from the intermediate surface in the fastening direction between the first member and the second member by the fastening member. It is possible to prevent the receiving surface from being strongly pressed against the rolling element due to the deformation. For this reason, it can suppress that the lifetime of an eccentric rocking | fluctuation type gear apparatus becomes short.

  The receiving surface may be located on the opposite side of the first contact surface from the second member in the fastening direction.

  In the eccentric oscillating gear device, the receiving surface is arranged outside the region between the first contact surface and the second contact surface in the fastening direction of the fastening member, so that the receiving surface is the first by the fastening member. It can suppress more that it receives the influence of a deformation | transformation of the 1st member accompanying the fastening of a member and a 2nd member.

  The receiving surface may be formed integrally with the first member.

  Since the eccentric oscillating gear device has a configuration in which the receiving surface is easily deformed with the deformation of the first member, the receiving surface is displaced from the intermediate surface in the fastening direction of the fastening member. It is preferable to suppress deformation of the receiving surface.

  The first member further includes a crankshaft rotatably supported on an inner peripheral surface formed on the first member, and the inner peripheral surface of the first member includes the intermediate member. It is preferable that the position is shifted from the surface in the fastening direction.

  In the eccentric oscillating gear device, since the inner peripheral surface of the first member is shifted from the intermediate surface in the fastening direction of the fastening member, it is accompanied by the fastening of the first member and the second member by the fastening member. It can suppress that the internal peripheral surface of the said 1st member deform | transforms greatly by the influence of a deformation | transformation of a 1st member. For this reason, it can suppress that it strongly presses against a crankshaft by deform | transforming the internal peripheral surface of a 1st member largely. Thereby, it can suppress that the lifetime of an eccentric rocking | fluctuation type gear apparatus becomes short.

  As described above, according to the present invention, there is provided an eccentric oscillating gear device that can prevent the life from being shortened.

It is sectional drawing which shows schematic structure of the eccentric rocking | fluctuation type gear apparatus which concerns on this embodiment. It is a top view which shows schematic structure of the eccentric rocking | fluctuation type gear apparatus which concerns on this embodiment, Comprising: It is the figure which abbreviate | omitted illustration of the transmission gearwheel and the crankshaft. FIG. 10 is a cross-sectional view illustrating a schematic configuration of an eccentric oscillating gear device, which is Modification 1 of the eccentric oscillating gear device according to the present embodiment. It is sectional drawing which shows schematic structure of the planetary gear apparatus described in patent document 1. FIG.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. However, for convenience of explanation, the drawings referred to below show only the main members among the constituent members of the eccentric oscillating gear device X1 according to the present embodiment in a simplified manner. Therefore, the eccentric oscillating gear device X1 according to the present embodiment can include any constituent member that is not shown in the drawings referred to in this specification.

  As shown in FIGS. 1 and 2, the eccentric oscillating gear device X <b> 1 includes an outer cylinder 2, a carrier 4, an oscillating gear 7, and a crankshaft 6. In the eccentric oscillating gear device X1, the outer cylinder 2 and the carrier 4 rotate relative to each other when the oscillating gear 7 oscillates and rotates as the crankshaft 6 rotates.

  The outer cylinder 2 includes a main body portion 2a having a substantially cylindrical shape with the axis C1 as a central axis, and an annular first extending portion 2b extending from a radial intermediate portion of the main body portion 2a to one side in the axis C1 direction. And an annular second extending portion 2c extending from the radially intermediate portion of the main body portion 2a to the other side in the axis C1 direction.

  A large number of pin grooves are formed on the inner peripheral surface 21 of the main body 2 a of the outer cylinder 2. Each pin groove is disposed so as to extend in the direction of the axis C1, and has a semicircular cross-sectional shape in a cross section orthogonal to the direction of the axis C1. The pin grooves are arranged at equal intervals in the circumferential direction of the outer cylinder 2.

  A plurality of mounting holes 22 penetrating the part in the direction of the axis C1 are formed in a part of the main body part 2a of the outer cylinder 2 that is located on the outer side in the radial direction from the first extending part 2b and the second extending part 2c. . The mounting holes 22 are arranged at equal intervals in the circumferential direction of the outer cylinder 2. Each attachment hole 22 is used when attaching an unillustrated counterpart member such as a base constituting a joint portion of the robot to the outer cylinder 2. When attaching the base which comprises the joint part of a robot with respect to the outer cylinder 2, the outer cylinder 2 becomes a member of the stationary side in the eccentric rocking | fluctuation type gear apparatus X1.

  The eccentric oscillating gear device X1 further includes a plurality of internal teeth pins 3 attached to the inner peripheral surface 21 of the main body 2a of the outer cylinder 2. Each internal tooth pin 3 has a cylindrical shape extending in the direction of the axis C1. Each internal tooth pin 3 is attached to each pin groove formed on the inner peripheral surface 21.

  The carrier 4 is a first member 41 located inside the first extending portion 2b of the outer cylinder 2 in the radial direction, and a second member located inside the main body 2a and the second extending portion 2c of the outer cylinder 2 in the radial direction. Member 42.

  The first member 41 includes an end plate portion 41f having a substantially disc shape and a first convex portion 41g connected to the end plate portion 41f. The first convex portion 41g protrudes toward the second member 42 from the end surface 41B of the end plate portion 41f located on the second member 42 side in the axis C1 direction. A plurality of first convex portions 41 g are provided side by side in the circumferential direction of the carrier 4. In the present embodiment, the first member 41 has three first convex portions 41g.

  A first outer peripheral surface 41F, a second outer peripheral surface 41H, and a second receiving surface 41G are formed on the end plate portion 41f of the first member 41. The first outer peripheral surface 41F, the second outer peripheral surface 41H, and the second receiving surface 41G constitute the outer peripheral surface of the end plate portion 41f.

  The first outer peripheral surface 41F is a surface located on the end surface 41A side in the axis C1 direction in the outer peripheral surface of the end plate portion 41f. The first outer peripheral surface 41F extends in the direction of the axis C1.

  The second outer peripheral surface 41H is a surface located on the end surface 41B side in the direction of the axis C1 in the outer surface of the end plate portion 41f. The second outer peripheral surface 41H is located more in the radial direction of the carrier 4 than the first outer peripheral surface 41F.

  The second receiving surface 41G is located between the first outer peripheral surface 41F and the second outer peripheral surface 41H in the direction of the axis C1, and has an arcuate curved surface. Details of the second receiving surface 41G will be described later.

  A center hole 41 a and a crankshaft hole 41 b are formed in the end plate portion 41 f of the first member 41.

  The central hole 41a is formed so as to penetrate the central portion of the end plate portion 41f in the direction of the axis C1.

  As shown in FIG. 2, a plurality of crankshaft holes 41b are formed side by side in the circumferential direction of the carrier 4 outside the center hole 41a. Each crankshaft hole 41b is formed so as to penetrate the end plate portion 41f in the direction of the axis C1. In the present embodiment, three crankshaft holes 41b are formed in the end plate portion 41f.

  The 2nd member 42 has the board | substrate part 42a which makes a substantially disk shape, and the 2nd convex part 42b connected with the said board | substrate part 42a. The 2nd convex part 42b is extended in the 1st member 41 side from the end surface of the board | substrate part 42a located in the 1st member 41 side in the axis C1 direction. Three second convex portions 42 b are provided corresponding to the positions of the three first convex portions 41 g in the first member 41. The 2nd convex part 42b and the 1st convex part 41g are contacting in the axis C1 direction inside the insertion hole 71b formed in the 1st rocking gear 71 mentioned later. In the present embodiment, the first convex portion 41 g of the first member 41 and the second convex portion 42 b of the second member 42 constitute the shaft portion A 1 of the carrier 4.

  The shaft portion A1 of the carrier 4 may not be configured by the first convex portion 41g and the second convex portion 42b, and may be configured only by the second convex portion 42b. That is, the first convex portion 41g of the first member 41 may not be provided. In this case, the second convex portion 42b is inserted into the insertion holes 71b and 72b of the rocking gear 7, and contacts the end surface 41B of the end plate portion 41f in the direction of the axis C1.

  A central hole 42c, a crankshaft hole 42d, and a mounting hole 42e are formed in the substrate portion 42a of the second member 42.

  The central hole 42c is formed so as to penetrate the central portion of the substrate portion 42a in the direction of the axis C1. The central hole 42c is provided corresponding to the position of the central hole 41a formed in the end plate portion 41f.

  A plurality of crankshaft holes 42d are formed side by side in the circumferential direction of the carrier 4 outside the central hole 42c. Each crankshaft hole 42d is formed so as to penetrate the substrate portion 42a in the direction of the axis C1. Each crankshaft hole 42d is provided corresponding to the position of each crankshaft hole 41b formed in the end plate portion 41f.

  The mounting hole 42e is formed so that the end surface of the board portion 42a opposite to the first member 41 in the axis C1 direction is recessed in the axis C1 direction. The attachment hole 42e is used to attach a counterpart member such as a swivel drum constituting the joint portion of the robot to the carrier 4. In the case where the turning drum constituting the joint portion of the robot is attached to the carrier 4, the carrier 4 is a rotation-side member in the eccentric oscillating gear device X1. For example, if a base constituting the joint part of the robot is attached to the carrier 4, a rotating drum constituting the joint part of the robot is attached to the outer cylinder 2, whereby the carrier 4 is eccentrically swung. The outer cylinder 2 is a member on the rotation side of the eccentric oscillating gear device X1 as well as a fixed member of the mold gear device X1.

  The crankshaft 6 includes a shaft main body 61 extending in the direction of the axis C <b> 1 and eccentric portions 62 and 63 that are eccentric with respect to the shaft main body 61. The crankshaft 6 is inserted into the crankshaft hole 41b of the first member 41, the crankshaft hole 41b of the second member 42, and crankshaft holes 71c and 52c of the swing gear 7 described later. In the present embodiment, a plurality (three) of the crankshafts 6 are provided side by side in the circumferential direction of the carrier 4. The number of crankshafts 6 is arbitrary, and can be changed as appropriate according to the usage mode of the eccentric oscillating gear device X1.

  The shaft body 61 is supported on the inner peripheral surface 41c of the crankshaft hole 41b via the crank bearing B1. The shaft body 61 is supported on the inner peripheral surface of the crankshaft hole 42d via the crank bearing B2. The crank bearings B 1 and B 2 allow the crank shaft 6 to rotate with respect to the carrier 4.

  The eccentric parts 62, 63 are connected to the shaft main body 61 in the direction of the axis C <b> 1 and are located on the inner side in the radial direction of the main body 2 a of the outer cylinder 2. A rocking gear 7 is attached to the eccentric parts 62 and 63 via rollers.

  The swing gear 7 has an axis extending in the direction of the axis C1. The swing gear 7 is located inside the main body 2a of the outer cylinder 2, and is sandwiched between the first member 41 and the second member 42 in the direction of the axis C1. The oscillating gear 7 includes a first oscillating gear 71 attached to the first eccentric part 62 via rollers, and a second oscillating gear 72 attached to the second eccentric part 63 via rollers. doing.

  The oscillating gears 71 and 72 have an outer diameter slightly smaller than the inner diameter of the main body portion 2a of the outer cylinder 2, and a plurality of external teeth are formed on the outer peripheral surface thereof. The number of external teeth formed on the outer peripheral surfaces of the swing gears 71 and 72 is slightly smaller than the number of internal tooth pins 3. Thus, the first oscillating gear 71 and the second oscillating gear 72 can be oscillated and rotated at phases different from each other so that each external tooth meshes with each internal tooth pin 8. The oscillating gear 7 may be constituted by one oscillating gear or may be constituted by three or more oscillating gears.

  The first rocking gear 71 has a central hole 71a corresponding to the position of the central hole 41a formed in the end plate portion 41f, an insertion hole 72b into which the first convex portion 41g and the second convex portion 42b are inserted, A crankshaft hole 71c into which the first eccentric portion 62 is inserted is formed.

  A center hole 72a corresponding to the position of the center hole 42c formed in the substrate portion 42a, an insertion hole 72b into which the second convex portion 42b is inserted, and a second eccentric portion 63 are inserted into the second swing gear 72. The crankshaft hole 72c is formed.

  The eccentric oscillating gear device X1 further includes a transmission gear 8 that transmits a driving force to the crankshaft 6 to rotate the crankshaft 6. The transmission gear 8 is located on the opposite side of the second member 42 across the first member 41 in the direction of the axis C1. The transmission gear 8 is attached to one end of the shaft body 61 of the crankshaft 6.

  The eccentric oscillating gear device X <b> 1 further includes a fastening member 5 that fastens the first member 41 and the second member 42, and a main bearing 9 that is provided between the outer cylinder 2 and the carrier 4. . The first member 41 and the second member 42 fastened to each other by the fastening member 5 can rotate relative to the outer cylinder 2 via the main bearing 9. That is, the main bearing 9 allows relative rotation between the outer cylinder 2 and the carrier 4.

  The fastening member 5 includes a fastening portion 51 having a male screw shape, and a head 52 connected to the fastening portion 51 and having an outer diameter larger than the outer diameter of the fastening portion 51. The fastening member 5 is connected to the first member 41 and the second member 42 along the axis C1 direction from the end surface 41A side of the end plate portion 41f of the first member 41 opposite to the second member 42 in the axis C1 direction. Inserted. In the present embodiment, as shown in FIG. 2, two fastening members 5 are provided between the crankshaft holes 71c adjacent to each other in the circumferential direction of the carrier 4, and a total of six fastening members 5 are provided in the circumferential direction. Located side by side.

  The first member 41 is formed with an accommodating portion 41d that accommodates the head portion 52 and a through hole 41e that is connected to the accommodating portion 41d and into which the root portion of the fastening portion 51 is inserted.

  The accommodating portion 41d is formed such that a part of the end surface 41A of the end plate portion 41f of the first member 41 is recessed in the axis C1 direction. The accommodating portion 41d is formed corresponding to the position of the shaft portion A1 in the direction of the axis C1. In the present embodiment, two accommodating portions 41d are formed corresponding to the respective positions of the three shaft portions A1, and a total of six accommodating portions 41d are positioned side by side in the circumferential direction of the carrier 4. .

  The through hole 41e is formed from the bottom surface of the housing portion 41d to the end surface on the second convex portion 42b side of the first convex portion 41g in the direction of the axis C1. The diameter of the through hole 41e is set smaller than the diameter of the bottom surface of the accommodating portion 41d. The accommodating part 41d and the through hole 41e penetrate the first member 41 in the axis C1 direction.

  The second member 42 has a female screw shape and is formed with a fastening hole 42f into which the distal end portion of the fastening portion 51 is inserted. The fastening hole 42f is formed so that a part of the end surface on the first convex portion 41g side of the second convex portion 42b of the second member 42 is recessed in the direction of the axis C1. The fastening hole 42f is formed corresponding to the position of the through hole 41e, and is thus connected to the through hole 41e. In the present embodiment, the fastening hole 42f is a hole with a bottom, but is not limited thereto, and may be a through-hole penetrating from the second convex portion 42b to the substrate portion 42a in the direction of the axis C1. .

  The fastening member 5 is inserted into the accommodating portion 41d, the through hole 41e, and the fastening hole 42f from the end surface 41A side of the end plate portion 41f in the direction of the axis C1. In the insertion process, the distal end portion of the fastening portion 51 is screwed into the fastening hole 42f, whereby the first member 41 and the second member 42 are fastened in the direction of the axis C1.

  In a state in which the first member 41 and the second member 42 are fastened, the bottom surface of the housing portion 41d contacts the head 52 of the fastening member 5, and thereby the bottom surface becomes the first contact surface 41C. The first contact surface 41C receives the fastening force of the fastening member 5 from the head 52 to the second member 42 side in the axis C1 direction.

  In addition, in a state where the first member 41 and the second member 42 are fastened, the end surface of the first convex portion 41g on the second convex portion 42b side contacts the second convex portion 42b, whereby the end surface is It becomes 2nd contact surface 41D. The second contact surface 41D receives the fastening force of the fastening member 5 from the second convex portion 42b to the first member 41 side in the axis C1 direction.

  As described above, the portion of the first member 41 between the first contact surface 41C and the second contact surface 41D in the direction of the axis C1 receives the fastening force of the fastening member 5 from both sides in the direction of the axis C1. .

  The main bearing 9 includes a first main bearing 91 and a second main bearing 92 that is separated from the first main bearing 91 in the direction of the axis C1. The first main bearing 91 and the second main bearing 92 have an annular shape. The first main bearing 91 is provided between the outer peripheral surface of the end plate portion 41 f in the first member 41 and the inner peripheral surface of the first extending portion 2 b in the outer cylinder 2. The second main bearing 92 is provided between the outer peripheral surface of the substrate portion 42 a in the second member 42 and the inner peripheral surface of the second extending portion 2 c of the outer cylinder 2. In the present embodiment, the first main bearing 91 and the second main bearing 92 have the same configuration that is symmetrical in the direction of the axis C1.

  The first main bearing 91 is located within the length range of the fastening member 5 extending in the direction of the axis C1. In the present embodiment, the entire first main bearing 91 is positioned within the length range of the fastening member 5, but not limited to this, only a part of the first main bearing 91 is positioned within the length range. You may do it.

  The first main bearing 91 includes a rolling element 91b, a first receiving surface 91A for receiving the rolling element 91b with the outer cylinder 2, and a second receiving surface 41G for receiving the rolling element 91b with the first member 41. ,have.

  The rolling element 91b is rotatably supported between the first receiving surface 91A and the second receiving surface 41G. In this embodiment, the rolling element 91b has a spherical shape. Note that the rolling element 91b may have a cylindrical shape, for example. When the rolling element 91b has a cylindrical shape, the first main bearing 91 is a thrust bearing against relative rotation between the outer cylinder 2 and the carrier 4 by tilting the rotation axis of the rolling element 91b with respect to the axis C1. And function as a radial bearing.

  91 A of 1st receiving surfaces are formed in the receiving member 91a arrange | positioned along the internal peripheral surface of the 1st extension part 2b in the outer cylinder 2, and the axial C1 direction end surface of the main-body part 2a. 91 A of 1st receiving surfaces are surfaces which the rolling element 91b contacts among the receiving members 91a. The first receiving surface 91A has an arcuate curved surface. The receiving member 91a may not be provided, and the first receiving surface 91A may be formed on the outer cylinder 2. In this case, an arcuate curved surface is formed in the outer cylinder 2 from the inner peripheral surface of the first extending portion 2b to the end surface in the axis C1 direction of the main body portion 2a, and the curved surface functions as the first receiving surface 91A.

  The second receiving surface 41G is formed on the outer peripheral surface of the end plate portion 41f and is in contact with the rolling element 91b. In the present embodiment, the second receiving surface 41G of the first main bearing 91 is formed integrally with the end plate portion 41f of the first member 41, but is not limited thereto. For example, a receiving member may be attached to the outer peripheral surface of the end plate portion 41f, and the second receiving surface 41G may be formed on the receiving member.

  As shown in FIG. 1, the second receiving surface 41 </ b> G is positioned so as to be shifted from the intermediate surface S <b> 1 that is a virtual plane in the direction of the axis C <b> 1 that is the fastening direction of the fastening member 5. The intermediate surface S1 is a surface in which the first contact surface 41C and the second contact surface 41D are at an equal distance in the direction of the axis C1, and is located between the first contact surface 41C and the second contact surface 41D. . In the present embodiment, the intermediate surface S1 overlaps the end surface 41B of the end plate portion 41f in the direction of the axis C1. Therefore, the first outer peripheral surface 41F, the second outer peripheral surface 41H, and the second receiving surface 41G, which are the outer peripheral surfaces of the end plate portion 41f, are closer to the end surface 41A side of the end plate portion 41f than the intermediate surface S1 in the axis C1 direction. positioned.

  In addition, when the shaft portion A1 includes only the second convex portion 42b, the second convex portion 42b contacts the end surface 41B of the end plate portion 41f, and thus the end surface 41B becomes the second contact surface 41D. In this case, the intermediate surface S1 is a virtual plane in which the first contact surface 41C and the end surface 41B are at an equal distance in the direction of the axis C1.

  Thus, in the eccentric oscillating gear device X1 according to this embodiment, the first main bearing 91 is located within the length range of the fastening member 5, and therefore the eccentric oscillating gear device X1 is the fastening member. 5 can be prevented from increasing in size in the direction of the axis C1, which is the fastening direction. In addition, since the second receiving surface 41G is displaced from the intermediate surface S1 in the fastening direction, the first member 41 and the second member 42 are fastened together with the fastening of the first member 41 and the second member 42. Even if the part located on the intermediate surface S1 is greatly deformed outward in the radial direction of the carrier 4, it is possible to prevent the second receiving surface 41G from being strongly pressed against the rolling element 91b. For this reason, it can suppress that the lifetime of the eccentric oscillation gear apparatus X1 becomes short.

  In the eccentric oscillating gear device X1 according to the present embodiment, since the second receiving surface 41G is formed on the outer peripheral surface of the first member 41, the first member 41 and the second member 42 are connected by the fastening member 5. With this fastening, the second receiving surface 41G is easily deformed so as to bulge toward the rolling element 91b. Therefore, the second receiving surface 41G is escaped from a portion on the intermediate surface S1 that is most likely to be deformed with the fastening of the first member 41 and the second member 42 by the fastening member 5 of the first member 41. It is preferable to suppress the deformation of the second receiving surface 41G by arranging.

  Next, a modification of the eccentric oscillating gear device X1 according to the present embodiment will be described with reference to FIG.

  As shown in FIG. 3, in the direction of the axis C1, the depth of the accommodating portion 41d in the eccentric oscillating gear device X1 according to the modification is the same as that of the accommodating portion 41d in the eccentric oscillating gear device X1 according to the above embodiment. It is set deeper than the depth. Further, in the direction of the axis C1, the length of the first convex portion 41g of the first member 41 in the eccentric oscillating gear device X1 according to the modified example is the first length in the eccentric oscillating gear device X1 according to the above embodiment. The length of the first convex portion 41g of the member 41 is set longer. Further, in the direction of the axis C1, the length of the second convex portion 41g42b of the second member 42 in the eccentric oscillating gear device X1 according to the modification is the second in the eccentric oscillating gear device X1 according to the above embodiment. The length of the second convex portion 42b of the member 42 is set shorter.

  The first contact surface 41C of the housing portion 41d in the eccentric oscillating gear device X1 according to the modification is located on the same plane as the end surface 41B of the end plate portion 41f. Thereby, the 2nd receiving surface 41G of the 1st main bearing 91 is located in the side opposite to the 2nd member 42 in the direction of axis C1 rather than the 1st contact surface 41C.

  In the eccentric oscillating gear device X1 according to the modification, the second contact surface 41D of the first convex portion 41g is located between the first oscillating gear 71 and the second oscillating gear 72 in the axis C1 direction. . That is, the first convex portion 41g of the first member 41 and the second convex portion 42b of the second member 42 are in contact with each other between the first swing gear 71 and the second swing gear 72 in the direction of the axis C1. Yes.

  In the eccentric oscillating gear device X1 according to the modification, the intermediate surface S1 between the first contact surface 41C and the second contact surface 41D is the end surface 41B of the end plate portion 41f in the direction of the axis C1 that is the fastening direction of the fastening member 5. Rather than the second member 42 side. Thereby, the main bearing 9 is located in the end surface 41A side of the end plate part 41f rather than the intermediate surface S1 in the direction of the axis C1. Further, the inner peripheral surface 41c of the crankshaft hole 41b formed in the end plate portion 41f is located closer to the end surface 41A side of the end plate portion 41f than the intermediate surface S1 in the axis C1 direction. That is, the inner peripheral surface 41 c is positioned so as to be shifted from the intermediate surface S <b> 1 in the direction of the axis C <b> 1 that is the fastening direction of the fastening member 5.

  Of the first member 41, the portion located between the first contact surface 41 </ b> C and the second contact surface 41 </ b> D in the direction of the axis C <b> 1 that is the fastening direction of the fastening member 5 is the second member 41 and the second member 41. As the member 42 is fastened, it is a portion where the outside of the carrier 4 is easily deformed in the radial direction. In the eccentric oscillating gear device X1 according to the modification, the second receiving surface 41G is arranged from the portion where the deformation is likely to occur by disposing the second receiving surface 41G closer to the end surface 41A than the first contact surface 41C in the direction of the axis C1. 41G can be escaped. Thereby, it can suppress more that the 2nd receiving surface 41G receives the influence of the deformation | transformation of the 1st member 41 accompanying the fastening of the 1st member 41 and the 2nd member 42 by the fastening member 5. FIG.

  Further, in the eccentric oscillating gear device X1 according to the modified example, the inner peripheral surface 41c of the crankshaft hole 41b in the first member 41 is positioned so as to be shifted from the intermediate surface S1 in the direction of the axis C1 that is the fastening direction of the fastening member 5. ing. For this reason, it can suppress that the internal peripheral surface 41c deform | transforms greatly by the influence of the deformation | transformation of the 1st member 41 accompanying the fastening of the 1st member 41 and the 2nd member 42 by the fastening member 5. FIG. Therefore, when the inner peripheral surface 41c is greatly deformed, it is possible to prevent the inner peripheral surface 41c from applying a strong pressing force to the shaft main body 61 of the crankshaft 6 via the crank bearing B1. Thereby, it can suppress that the lifetime of the eccentric rocking | fluctuation type gear apparatus X1 becomes short.

  In the modification shown in FIG. 3, the shaft portion A1 is constituted by the first convex portion 41g and the second convex portion 42b. However, the present invention is not limited to this, and the shaft portion A1 may be constituted only by the first convex portion 41g. Good. That is, the 2nd member 42 does not need to have the 2nd convex part 42b. In this case, the first convex portion 41g is inserted into the insertion holes 71b and 72b of the rocking gear 7, and the second contact surface 41D of the first convex portion 41g is on the end surface of the substrate portion 42a on the first member 41 side. Will be in contact.

  It should be thought that this embodiment and the modification which were demonstrated above are illustrations in all the points, and are not restrictive. The scope of the present invention is shown not by the above description of the embodiments and modifications but by the scope of claims for patent, and includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

S1 intermediate surface X1 eccentric oscillating gear device 2 outer cylinder 4 carrier 5 fastening member 6 crankshaft 7 oscillating gear 9 main bearing 41 first member 41C first contact surface 41D second contact surface 41G second receiving surface 41c inner circumference Surface 42 Second member 52 Head 91 First main bearing 91b Rolling element

Claims (4)

An outer cylinder,
A carrier having a first member and a second member;
A fastening member having a head for pressing the first member from the side opposite to the second member, and fastening the first member and the second member;
While having a receiving surface for receiving the rolling element by the first member, at least a part thereof is positioned within the length range of the fastening member and allows relative rotation between the outer cylinder and the carrier. A main bearing,
The first member has a first contact surface that receives a fastening force of the fastening member from the head, and a second contact surface that receives a fastening force of the fastening member from the second member,
In the fastening direction between the first member and the second member by the fastening member, the receiving surface is moved from a virtual intermediate surface in which the first contact surface and the second contact surface are at an equal distance in the fastening direction. An eccentric oscillating gear device that is located at a deviation.   2. The eccentric oscillating gear device according to claim 1, wherein the receiving surface is located on a side opposite to the second member in the fastening direction with respect to the first contact surface.   The eccentric oscillating gear device according to claim 1, wherein the receiving surface is formed integrally with the first member. A crankshaft rotatably supported on an inner peripheral surface formed in the first member, and for swinging and rotating the swing gear;
The eccentric oscillating gear device according to any one of claims 1 to 3, wherein the inner peripheral surface of the first member is shifted from the intermediate surface in the fastening direction.

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