JP5336311B2 - Member coupling structure, eccentric oscillating gear device, method of forming member coupling structure, and manufacturing method of eccentric oscillating gear device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To secure the positioning accuracy and connection strength of two members while preventing the work of attaching both the members to each other from becoming complicated. <P>SOLUTION: The member connecting structure is for connecting a second flange 6 provided with first connection holes 6b to a shaft part 8 which is arranged on one side of the second flange 6 in the extending direction of the connection holes 6b and is provided with first screw holes 8a extending in the same direction with the first connection holes 6b and second connection holes 8b extending continuously from the first screw holes 8a to a second flange 6 side. The member connecting structure includes: bolts 10 having screws 10a with distal end side portions screwed into the first screw holes 8a; and positioning members 12 inserted in the first connection holes 6b and the second connection holes 8b to extend over them and having second screw holes 12a screwed to base end side of the screws 10a of the bolts 10. The positioning member 12 has such a wall thickness that the positioning member is expanded in diameter when the bolt 10 is fastened to the same. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a member coupling structure, an eccentric oscillating gear device, a method for forming a member coupling structure, and a method for manufacturing an eccentric oscillating gear device.

  Conventionally, by rotating and rotating an external gear attached to an eccentric portion of a crankshaft while meshing with an internal tooth provided on an inner surface of an outer cylinder, an output rotation decelerated from a rotation input to the crankshaft is obtained. Such an eccentric oscillating gear device is known (for example, see Patent Document 1).

  In the eccentric oscillating gear device disclosed in Patent Document 1, a first support flange and a second support flange are provided in an outer cylinder so as to be rotatable coaxially with respect to the outer cylinder. The first support flange and the second support flange are spaced apart from each other in the axial direction of the outer cylinder, and an external gear is disposed between the two flanges. An inner pin extending toward the second support flange is formed integrally with the first support flange, and the inner pin is coupled to the second support flange. The inner pin is inserted through an insertion hole formed so as to penetrate the external gear in the axial direction. The rotational force of the external gear is applied to the inner pin, whereby the first support flange, the second support flange and the inner pin integrally rotate relative to the outer cylinder.

  The inner pin is formed with a hole extending from the end surface on the second support flange side to the first flange side and a screw hole extending continuously from the hole to the first flange side. Further, a through hole extending in the axial direction of the outer cylinder is formed in the second support flange at a position corresponding to the hole of the inner pin. A cylindrical knock pin is driven into the through hole of the second support flange and the hole of the inner pin so as to straddle both the holes. The connecting bolt is inserted into the through hole of the second support flange and penetrates the knock pin and is screwed into the screw hole of the inner pin. The inner pin and the second support flange are fastened by this connecting bolt.

  The knock pin is driven so as to straddle the through hole of the second support flange and the hole of the inner pin, thereby enabling high-accuracy positioning between the inner pin and the second support flange. The connection strength between the inner pin and the second support flange against the force around the axis of the outer cylinder acting between the support flange and the support flange is improved.

JP 2006-46596 A

  However, in the gear device disclosed in Patent Document 1, when the inner pin and the second support flange are assembled, the knock pin is straddled over both the holes so as to press-fit the knock pin into the through hole of the second support flange and the hole of the inner pin. Thus, since it is necessary to drive the knock pin, there is a problem that the assembling work of the inner pin and the second support flange becomes complicated.

  The present invention has been made to solve the above-described problems, and its purpose is to prevent the work of assembling the two members from becoming complicated, while positioning accuracy and connecting strength between the two members. Is to secure.

  In order to achieve the above object, the member coupling structure according to the present invention includes a first member provided with a first connection hole penetrating in a specific direction, and one of the first members in a direction in which the first connection hole extends. A first screw hole disposed on the side and extending in the same direction as the first connection hole and a second member provided with a second connection hole extending continuously from the first screw hole to the first member side are coupled. And a bolt having a screw portion inserted through the first connecting hole and the second connecting hole and having a distal end portion screwed into the first screw hole; A positioning member having a second screw hole which is inserted and fitted so as to straddle the one connection hole and the second connection hole and is screwed with a portion on the proximal end side of the screw part of the bolt. It has a thickness that expands when the bolt is tightened.

  In this member coupling structure, since the positioning member is inserted so as to straddle the first connection hole and the second connection hole, there is no great resistance when the positioning member is inserted into both the connection holes. It can be easily inserted into both connecting holes. Therefore, unlike the conventional configuration in which the knock pin is driven to press-fit the knock pin into the holes of the two members when the two members are assembled, the assembly work of the first member and the second member can be prevented from becoming complicated. it can. In this configuration, the positioning member can be inserted so as to straddle both connection holes from the first connection hole toward the second connection hole, and then the first screw hole of the second member and the first of the positioning member A bolt can be screwed into the two screw holes and tightened. Here, in this structure, since the positioning member has such a thickness that the diameter is increased by tightening the bolt, the positioning member is expanded by tightening the bolt, Pressed against the inner surface of the hole. Thereby, the 2nd member, the positioning member, and the 1st member are fixed in the state where they were positioned mutually. As a result, the positioning accuracy and connection strength of the 1st member and the 2nd member can be secured. Therefore, in this configuration, it is possible to ensure the positioning accuracy and connection strength between the two members while preventing the assembly work of the first member and the second member from becoming complicated. Moreover, in this structure, since the bolt which fastens the 1st member and the 2nd member is inserted by the positioning member, when providing a positioning member separately in the location away from the fastening location by a bolt in the 1st member and the 2nd member In comparison, the space in the first member and the second member required for providing the positioning member can be reduced. For this reason, it is possible to reduce the size of the first member and the second member. Furthermore, in this configuration, if the bolt is loosened and removed, the positioning member can be easily extracted from both the connecting holes. For this reason, the first member and the second member can be easily separated at the time of maintenance, and further, these two members can be easily reassembled.

  In the member coupling structure, a step portion is provided on an inner surface of the first connection hole so that an end portion on the second member side protrudes radially inward, and the positioning member includes the step portion. It is preferable that a washer is provided in contact with the portion to receive the head of the bolt when the bolt is tightened.

  In the configuration in which the washer is not provided on the positioning member and the head of the bolt is pressed against the step in the first connecting hole when the bolt is tightened, the step in the first connecting hole is the head of the bolt. There is a risk of depression due to the pressing force received from the part. On the other hand, according to this structure, since the head part of the bolt can be received by the washer when the bolt is tightened, the stepped portion can be prevented from being depressed.

  In the member coupling structure, the inner peripheral surfaces of the first connection hole and the second connection hole have a continuous tapered inner peripheral surface that decreases in diameter toward the first screw hole side, and the positioning The member may have a tapered outer peripheral surface that fits into the tapered inner peripheral surface.

  If comprised in this way, a positioning member will be pressed to the 1st screw hole side by the head of a bolt by fastening a volt | bolt, and, thereby, the taper-shaped outer peripheral surface of a locating member may be connected with a 1st connection hole and a 2nd connection hole. It is pressed against the tapered inner peripheral surface of the hole. At this time, since a component force that presses the first member from the positioning member toward the second member acts, the frictional force acting between the end surfaces of the first member and the second member that are in contact with each other can be increased. As a result, for example, in the case where the first member and the second member rotate together, it is possible to further strengthen the connecting force of both members to counter the force in the rotational direction acting between both members. it can.

  An eccentric oscillating gear device according to the present invention is an eccentric oscillating gear device to which any one of the above-described member coupling structures is applied, and includes an outer cylinder having an inner surface provided with a plurality of internal teeth, A crankshaft that is rotatably provided in the outer cylinder and has an eccentric portion, and an external gear that is attached to the eccentric portion and that oscillates and rotates in conjunction with the eccentric rotation of the eccentric portion while meshing with the inner teeth. The first member and the second member are fastened to each other by the bolt, and rotate integrally around the axis of the outer cylinder by transmitting the rotational force of the external gear, The first connecting hole penetrates the first member in the axial direction of the outer cylinder, and the first screw hole and the second connecting hole extend in the same direction as the first connecting hole.

  In this eccentric oscillating gear device, since the above-described member coupling structure is applied, the assembly work of the first member and the second member that rotate integrally around the axis of the outer cylinder becomes complicated. It is possible to ensure positioning accuracy and connection strength around the axis of the two members while preventing the above. Further, in this gear device, since the above-described member coupling structure is applied, the first member and the second member can be reduced in size, and the first member and the second member can be easily maintained during maintenance. Both separation and reassembly of both members can be easily performed.

  In the eccentric oscillating gear device, the eccentric oscillating gear device includes a first flange provided in the outer cylinder so as to be rotatable about the axis of the outer cylinder, and the external gear includes the outer gear. The first member is a second flange that is spaced apart from the first flange in the axial direction of the outer cylinder, and the second member includes the insertion hole that penetrates in the axial direction of the cylinder. It may be a shaft portion extending from the first flange toward the second flange and inserted through the insertion hole.

  In this configuration, the rotational force of the external gear is applied to the shaft portion, and the shaft portion, the first flange, and the second flange rotate integrally around the axis of the outer cylinder. When the rotational force of the external gear is applied to the shaft portion, a force in the rotational direction around the axis of the outer cylinder acts between the shaft portion and the second flange. In this configuration, the connection strength between the shaft portion and the second flange to counter such a force acting in the rotation direction can be ensured by the bolt and the positioning member.

  According to another aspect of the present invention, there is provided a method for forming a member connection structure, wherein the first connection hole and the second connection hole are overlapped with each other. An alignment step of combining one member and the second member, and after the alignment step, the second connection from the first connection hole so that the positioning member straddles the first connection hole and the second connection hole An insertion step of inserting toward the hole, and a bolt tightening step of tightening the bolt by screwing the bolt into the first screw hole of the second member and the second screw hole of the positioning member after the insertion step And.

  In this method of forming the coupling structure of members, the positioning member is inserted from the first coupling hole toward the second coupling hole in a state where the first member and the second member are combined, and then the bolt is inserted into the second member of the second member. The first screw hole and the second screw hole of the positioning member are screwed together and tightened. For this reason, when inserting a positioning member into both connecting holes, a positioning member can be easily inserted into both connecting holes without a large resistance, and the first member is inserted by the positioning member inserted into both connecting holes. The two members can be fixed to each other by fastening with bolts after positioning the second member and the second member.

  The manufacturing method of the eccentric oscillating gear device according to the present invention is a method for manufacturing any one of the eccentric oscillating gear devices, wherein the first connecting hole and the second connecting hole overlap. After aligning the first member and the second member, and after the aligning step, the positioning member extends from the first connection hole so as to straddle the first connection hole and the second connection hole. An insertion step of inserting toward the second connection hole; and after the insertion step, the bolt is screwed into the first screw hole of the second member and the second screw hole of the positioning member and tightened. And a bolting process.

  In the manufacturing method of the eccentric oscillating gear device, the positioning member is inserted from the first connection hole toward the second connection hole in a state where the first member and the second member are combined, and then the bolt is attached to the second member. The first screw hole and the second screw hole of the positioning member are screwed together and tightened. For this reason, when inserting a positioning member into both connecting holes, a positioning member can be easily inserted into both connecting holes without a large resistance, and the first member is inserted by the positioning member inserted into both connecting holes. The two members can be fixed to each other by fastening with bolts after positioning the second member and the second member.

  As described above, according to the present invention, it is possible to ensure the positioning accuracy and connection strength between the two members while preventing the assembly work of the first member and the second member from being complicated.

It is sectional drawing along the axial direction of the eccentric rocking | fluctuation type gear apparatus by one Embodiment of this invention. It is sectional drawing along the II-II line in FIG. 1 of the eccentric rocking | fluctuation type gear apparatus by one Embodiment of this invention. It is a figure which expands and shows partially the fastening part of the shaft part and 2nd flange of the eccentric rocking | fluctuation type gear apparatus shown in FIG. It is a figure which expands and shows partially the fastening part of the shaft part and 2nd flange of the eccentric rocking | fluctuation type gear apparatus by the modification of one Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  First, the configuration of an eccentric oscillating gear device to which a member coupling structure according to an embodiment of the present invention is applied will be described with reference to FIGS.

  An eccentric oscillating gear device (hereinafter simply referred to as a gear device) to which the member coupling structure according to the present embodiment is applied includes, for example, a speed reducer in a revolving part of a revolving body or arm joint of a robot or a revolving part of various machine tools. From the rotation input to the crankshaft 16 when the external gears 22 and 24 oscillate and rotate while meshing with the internal teeth pin 3 in conjunction with the eccentric portions 16a and 16b of the crankshaft 16. This is a so-called externally oscillating gear device configured to obtain a reduced output rotation. The gear device of the present embodiment is connected between two counterpart members (not shown), and transmits the output rotation to one of the two counterpart members and transmits the output rotation to one of the two counterpart members. The counterpart member is rotated relative to the other counterpart member.

  Specifically, as shown in FIG. 1, the gear device of the present embodiment includes an outer cylinder 2, an internal tooth pin 3, a first flange 4, a second flange 6, a shaft portion 8, and a bolt 10. Positioning member 12, washer 13, first main bearing 14a, second main bearing 14b, crankshaft 16, first crank bearing 18a, second crank bearing 18b, transmission gear 20, A first external gear 22, a second external gear 24, a first roller bearing 26a, and a second roller bearing 26b are provided.

  The outer cylinder 2 functions as a case constituting the outer surface of the gear device and is formed in a substantially cylindrical shape. The outer cylinder 2 is fastened to the other counterpart member (not shown) by a bolt (not shown). A large number of pin grooves 2 b are formed on the inner surface of the outer cylinder 2. Each pin groove 2 b extends in the axial direction of the outer cylinder 2, and is provided on the inner surface of the outer cylinder 2 at equal intervals in the circumferential direction.

  The internal tooth pin 3 is fitted in each pin groove 2b. That is, a plurality of internal teeth pins 3 are provided on the inner surface of the outer cylinder 2 at equal intervals in the circumferential direction. In addition, this internal tooth pin 3 is included in the concept of the internal tooth of this invention.

  The first flange 4 is fastened to the one counterpart member (not shown) by a bolt (not shown). The first flange 4 is formed in a substantially disc shape, and is rotatably provided around the axis of the outer cylinder 2 by being supported by the first main bearing 14 a in the outer cylinder 2. The first flange 4 is disposed in the vicinity of one end of the outer cylinder 2 in the axial direction. The first flange 4 is provided with a crankshaft mounting hole 4a (hereinafter simply referred to as a mounting hole 4a). Although not shown, the three mounting holes 4 a are provided in the first flange 4, and the three mounting holes 4 a are arranged at equal intervals in the circumferential direction of the first flange 4.

  The second flange 6 is formed in a substantially disc shape, and is rotatably provided around the axis of the outer cylinder 2 by being supported by the second main bearing 14 b in the outer cylinder 2. The second flange 6 is included in the concept of the first member of the present invention. The second flange 6 is disposed away from the first flange 4 in the axial direction of the outer cylinder 2 and is disposed in the vicinity of the other end portion of the outer cylinder 2 in the axial direction. The second flange 6 is provided with a crankshaft mounting hole 6a (hereinafter simply referred to as a mounting hole 6a) penetrating in the axial direction of the outer cylinder 2. Although not shown, three mounting holes 6 a are provided in the second flange 6, and each mounting hole 6 a is disposed at a position corresponding to the mounting hole 4 a of the first flange 4.

  The second flange 6 is provided with a first connection hole 6 b that penetrates in the axial direction of the outer cylinder 2. The first connection holes 6b are provided at portions located between the mounting holes 6a of the second flange 6 in the circumferential direction, and a total of three first connection holes 6b are provided in the second flange 6. A step portion 6c is provided on the inner surface of each first connection hole 6b so that the end on the first flange 4 side protrudes radially inward of the first connection hole 6b. The step part 6c protrudes uniformly over the entire circumferential direction of the first connection hole 6b. That is, the inner diameter of the first connection hole 6b in the portion where the step portion 6c is provided is the portion of the first connection hole 6b other than the portion where the step portion 6c is provided (the portion opposite to the first flange 4). It is smaller than the inner diameter. Further, the surface of the step portion 6 c opposite to the first flange 4 is a plane perpendicular to the axial direction of the outer cylinder 2.

  The shaft portion 8 is a portion that connects the first flange 4 and the second flange 6, and the shaft portion 8 is included in the concept of the second member of the present invention. The member connection structure according to the embodiment of the present invention is for connecting the shaft portion 8 and the second flange 6.

  As shown in FIG. 2, three shaft portions 8 are provided in the outer tube 2 at equal intervals in the circumferential direction of the outer tube 2. As shown in FIG. 1, each shaft portion 8 is provided integrally with the first flange 4, and linearly extends from the first flange 4 toward the second flange 6 along the axial direction of the outer cylinder 2. ing. That is, each shaft portion 8 is arranged at a position on the other end side in the axial direction of the outer cylinder 2 with respect to the second flange 6 (the direction in which the first connection hole 6b extends). Each shaft portion 8 is inserted into an insertion hole 22c, 24c (described later) of the external gears 22, 24 with play.

  Each shaft portion 8 is provided with a first screw hole 8a and a second connecting hole 8b as shown in FIG.

  The first screw hole 8a is screwed with a portion on the tip side of a screw portion 10a described later of the bolt 10. The first screw hole 8 a is disposed so as to be positioned at a substantially central portion in a cross section perpendicular to the longitudinal direction of the shaft portion 8. The first screw hole 8a extends in the same direction as the first connection hole 6b of the second flange 6, that is, the axial direction of the outer cylinder 2 (longitudinal direction of the shaft portion 8), and a screw groove 8c is formed on the inner surface thereof. Has been.

  The second connection hole 8b is arranged coaxially with the first screw hole 8a and extends continuously from the first screw hole 8a to the second flange 6 side along the axial direction of the outer cylinder 2. The second connection hole 8b is open at the tip end surface of the shaft portion 8 (end surface on the second flange 6 side). The second connection hole 8b has a larger inner diameter than the first screw hole 8a, and the inner diameter of the second connection hole 8b is equal to the inner diameter of the portion where the step portion 6c of the first connection hole 6b is provided. It has become. The second connection holes 8 b of the shaft portions 8 are disposed at positions corresponding to the first connection holes 6 b of the second flange 6 in the circumferential direction of the outer cylinder 2.

  The member coupling structure according to the present embodiment for coupling each shaft portion 8 and the second flange 6 includes a bolt 10 and a positioning member 12.

  The bolts 10 are for fastening the shaft portion 8 and the second flange 6, and a total of three bolts 10 are provided for fastening the three shaft portions 8 to the second flange 6. When the shaft portion 8 and the second flange 6 are fastened by the bolt 10, the shaft portion 8 and the flanges 4 and 6 are integrated. Each bolt 10 is inserted through the corresponding first connection hole 6b and second connection hole 8b. Each bolt 10 has a screw portion 10a and a head portion 10b. The screw portion 10 a is screwed into a first screw hole 8 a of the shaft portion 8 and a second screw hole 12 a described later of the positioning member 12.

  The positioning member 12 is inserted into both the connecting holes 6b and 8b so as to straddle the first connecting hole 6b and the second connecting hole 8b. The positioning member 12 is inserted into both the connecting holes 6b and 8b before the shaft portion 8 and the second flange 6 are fastened by the bolt 10 to position the shaft portion 8 and the second flange 6 between each other. Is what you do. The positioning member 12 is formed in a substantially circular tubular shape, and has a second screw hole 12a extending in the axial direction thereof. The second screw hole 12 a is screwed with a portion on the proximal end side of the screw portion 10 a of the bolt 10. That is, the positioning member 12 is held on the shaft portion 8 by the fastening force of the bolt 10. The inner diameter of the second screw hole 12a is equal to the inner diameter of the first screw hole 8a. The positioning member 12 has its outer peripheral surface in contact with the inner peripheral surface of the first connecting hole 6b, specifically, the inner peripheral surface of the portion where the step portion 6c is provided and the inner peripheral surface of the second connecting hole 8b. In addition, the outer diameter of the connecting holes 6b and 8b is such that they can be inserted without great resistance. That is, the fitting of the positioning member 12 with respect to both the connecting holes 6b and 8b is set to such an extent that it can be inserted into both the connecting holes 6b and 8b by hand force. Further, the positioning member 12 is made of metal and has such a thickness that the diameter is increased by tightening the bolt 10 screwed into the first screw hole 8a and the second screw hole 12a.

  The washer 13 is formed integrally with an end portion of the positioning member 12 disposed in the first connection hole 6b. The washer 13 is formed in a bowl shape that protrudes radially outward from the end of the positioning member 12. Both surfaces of the washer 13 in the axial direction of the positioning member 12 are flat surfaces perpendicular to the axial direction of the outer cylinder 2. The washer 13 comes into contact with the step portion 6c when the positioning member 12 is inserted from the first connection hole 6b toward the second connection hole 8b. In this state, the washer 13 receives the head 10b of the bolt 10 when the bolt 10 screwed into the first screw hole 8a and the second screw hole 12a is tightened. That is, the washer 13 is interposed between the head portion 10b of the bolt 10 and the step portion 6c, and prevents the head portion 10b from hitting the step portion 6c when the bolt 10 is tightened.

  Three crankshafts 16 are provided in the outer cylinder 2 (see FIG. 2). Each crankshaft 16 is attached to a corresponding mounting hole 4 a of the first flange 4 and a corresponding mounting hole 6 a of the second flange 6. Accordingly, the three crankshafts 16 are arranged at equal intervals in the circumferential direction in the outer cylinder 2.

  Specifically, one end of each crankshaft 16 in the axial direction is mounted in the corresponding mounting hole 4a of the first flange 4 via the first crank bearing 18a, while the axial direction of each crankshaft 16 is A portion closer to the inside in the axial direction by a predetermined length than the other end is attached to the corresponding attachment hole 6a of the second flange 6 via the second crank bearing 18b. That is, each crankshaft 16 is rotatably supported with respect to both flanges 4 and 6 by crank bearings 18a and 18b.

  Each crankshaft 16 has a first eccentric portion 16a and a second eccentric portion 16b. The first eccentric portion 16a and the second eccentric portion 16b are provided in a portion between the portions of the crankshaft 16 that are respectively supported by the crank bearings 18a and 18b, and are arranged side by side in the axial direction of the crankshaft 16. Yes. The first eccentric portion 16a and the second eccentric portion 16b are each formed in a cylindrical shape that is eccentric from the axis of the crankshaft 16 by a predetermined amount of eccentricity, and are arranged so as to have a phase difference of a predetermined angle therebetween. Has been. The other end of the crankshaft 16 protrudes from the second flange 6 to the opposite side of the first flange 4 through the mounting hole 6a, and a transmission gear 20 is provided at the protruding portion. An input gear provided on an input shaft (not shown) meshes with the transmission gear 20, and the rotational force transmitted from the motor (not shown) to the input shaft is applied to each crankshaft 16 via the input gear and the transmission gear 20. It is to be transmitted.

  The first external gear 22 and the second external gear 24 are arranged in the space between the first flange 4 and the second flange 6 in the outer cylinder 2 so as to be aligned in the axial direction of the outer cylinder 2. .

  As shown in FIG. 2, the first external gear 22 is provided with three first eccentric portion mounting holes 22 a arranged at equal intervals in the circumferential direction. The first eccentric portion 16a of the corresponding crankshaft 16 is inserted and fitted into each first eccentric portion mounting hole 22a via the first roller bearing 26a. That is, the first external gear 22 is attached to the first eccentric portion 16a of each crankshaft 16 via the first roller bearing 26a. The first external gear 22 has external teeth 22b that mesh with the internal tooth pins 3 on the outer peripheral portion. The first external gear 22 swings and rotates while meshing with the internal tooth pin 3 at the external teeth 22b in conjunction with the eccentric rotation of the first eccentric portion 16a. The first external gear 22 has three insertion holes 22 c that penetrate in the axial direction of the outer cylinder 2. Each insertion hole 22c is disposed at a position between each first eccentric portion mounting hole 22a in the circumferential direction of the first external gear 22. As described above, the corresponding shaft portion 8 is inserted into each insertion hole 22c with play.

  The second external gear 24 has the same structure as the first external gear 22. Specifically, the second external gear 24 is attached to the second eccentric portion 16b of each crankshaft 16 via the second roller bearing 26b. The second external gear 24 swings and rotates while meshing with the internal pin 3 at the external tooth 24b in conjunction with the eccentric rotation of the second eccentric portion 16b. The second external gear 24 is provided with three insertion holes 24c penetrating in the axial direction of the outer cylinder 2, and the shaft portions 8 corresponding to the insertion holes 24c have play respectively. It is inserted.

  Next, the operation of the gear device according to the present embodiment will be described.

  First, an input shaft (not shown) is rotated by driving a drive motor (not shown). As a result, a rotational force is input to each crankshaft 16 from the gear portion of the input shaft via each transmission gear 20.

  As each crankshaft 16 rotates, the first eccentric portion 16a and the second eccentric portion 16b of each crankshaft 16 rotate eccentrically. As a result, the first external gear 22 swings and rotates while meshing with the internal pin 3 in conjunction with the eccentric rotation of the first eccentric portion 16a, and the second outer gear interlocks with the eccentric rotation of the second eccentric portion 16b. The tooth gear 24 swings and rotates while meshing with the internal tooth pin 3. The rotational force of the first external gear 22 and the second external gear 24 is applied to each shaft portion 8. That is, the rotational force is transmitted to each shaft portion 8, the first flange 4, and the second flange 6, so that each shaft portion 8, the first flange 4, and the second flange 6 are applied to the outer cylinder 2. Rotate integrally around the axis of the outer cylinder 2 at a speed reduced from the input rotation.

  Next, a process for coupling the shaft portion 8 and the second flange 6 in the manufacturing method of the gear device according to the present embodiment, that is, a process for forming a member coupling structure according to the present embodiment will be described.

  When the shaft portion 8 and the second flange 6 are coupled, first, the shaft portion 8 corresponding to the insertion holes 22c, 24c of the external gears 22, 24 is inserted and the external gears 22, 24 are connected. The first flange 4 and the second flange 6 are sandwiched between the first flange 4 and the second flange 6 so that the first connection holes 6b and the corresponding second connection holes 8b overlap with each other in this state ( Combining step).

  Next, the positioning member 12 is inserted so as to straddle the first connection holes 6b and the corresponding second connection holes 8b (insertion step). At this time, the positioning member 12 can be inserted into both the connecting holes 6b and 8b without a large resistance. The positioning member 12 is inserted from the first connecting hole 6b toward the second connecting hole 8b until the washer 13 hits the stepped portion 6c. The shaft member 8 and the second flange 6 are positioned relative to each other by inserting the positioning member 12 into the connecting holes 6b and 8b.

  Next, the bolt 10 is screwed into the first screw hole 8a and the second screw hole 12a and tightened (bolt tightening step). At this time, the bolt 10 is screwed from the second screw hole 12a toward the first screw hole 8a, and finally the bolt 10 is tightened with the head 10b in contact with the washer 13. Here, as shown in FIG. 3, in response to tightening of the bolt 10, the screw thread 10c of the screw portion 10a of the bolt 10 exerts a wedge action on the screw groove 12d of the second screw hole 12a. A force directed radially outward from the crest 10c is applied to the positioning member 12. By this force, the positioning member 12 is slightly expanded in diameter, and the outer peripheral surface of the positioning member 12 is the inner peripheral surface of the portion where the step portion 6c of the first connecting hole 6b is provided and the inner peripheral surface of the second connecting hole 8b. And pressed against. As a result, a binding force acts between the inner peripheral surfaces and the outer peripheral surface of the positioning member 12. As a result, a connecting force by the positioning member 12 acts between the shaft portion 8 and the second flange 6 in addition to a fastening force by the bolt 10. In this way, the shaft portion 8 and the second flange 6 are coupled.

  As described above, in this embodiment, since the positioning member 12 is inserted so as to straddle the first connecting hole 6b and the second connecting hole 8b, when the positioning member 12 is inserted into both the connecting holes 6b and 8b. There is no great resistance, and the positioning member 12 can be easily inserted into both the connecting holes 6b and 8b. For this reason, when assembling two integrally rotating members, the assembly work of the shaft portion 8 and the second flange 6 is complicated, unlike a configuration in which a knock pin is pressed into the holes of both members. Can be prevented. And in this embodiment, the positioning member 12 can be inserted and fitted so that it may straddle both connection holes 6b and 8b toward the 2nd connection hole 8b from the 1st connection hole 6b, and the 1st of the shaft part 8 is after that. The bolt 10 can be screwed into the screw hole 8a and the second screw hole 12a of the positioning member 12 and tightened. Here, in this embodiment, since the positioning member 12 has such a thickness that the diameter is increased by tightening the bolt 10, the positioning member 12 is expanded by tightening the bolt 10. The outer surface is pressed against the inner surfaces of both the connecting holes 6b and 8b. Thereby, the shaft part 8, the positioning member 12, and the 2nd flange 6 are fixed in the state positioned mutually, As a result, the positioning precision and connection strength of the shaft part 8 and the 2nd flange 6 can be ensured. it can. Therefore, in this embodiment, in the gear device, the positioning accuracy between the shaft portion 8 and the second flange 6 is prevented while preventing the assembly work of the shaft portion 8 and the second flange 6 that rotate integrally with each other from being complicated. And connection strength can be secured.

  Moreover, in this embodiment, since the bolt 10 which fastens the shaft part 8 and the 2nd flange 6 is inserted in the positioning member 12, it positions in the location away from the fastening location by the bolt 10 in the shaft part 8 and the 2nd flange 6. Compared with the case where a member is provided separately, the space in the shaft part 8 and the 2nd flange 6 required in order to provide the positioning member 12 can be made small. For this reason, it is possible to reduce the size of the shaft portion 8 and the second flange 6.

  Furthermore, in this embodiment, if the bolt 10 is loosened and removed at the time of maintenance of the gear device, the positioning member 12 can be easily extracted from both the connecting holes 6b and 8b. For this reason, the shaft portion 8 and the second flange 6 can be easily separated during maintenance, and the shaft portion 8 and the second flange 6 can be easily reassembled.

  In the present embodiment, the positioning member 12 is provided with a washer 13 that contacts the stepped portion 6c and receives the head 10b of the bolt 10 when the bolt 10 is tightened. It is possible to prevent the stepped portion 6c from being depressed due to the pressing force received from the head 10b of the bolt 10 sometimes.

  In the present embodiment, the rotational force of the external gears 22 and 24 is applied to the shaft portion 8, and the shaft portion 8, the first flange 4, and the second flange 6 rotate integrally around the axis of the outer cylinder 2. To do. When the rotational force of the external gears 22 and 24 is applied to the shaft portion 8, stress in the rotational direction around the axis of the outer cylinder 2 acts between the shaft portion 8 and the second flange 6. In the present embodiment, the positioning member 12 can ensure the connection strength between the shaft portion 8 and the second flange 6 to counter such stress in the rotational direction.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and further includes meanings equivalent to the scope of claims for patent and all modifications within the scope.

  For example, the washer 13 provided on the positioning member 12 may be omitted. Alternatively, the positioning member 12 may be a cylindrical member having a uniform outer diameter without a flange, and a washer that is a separate member from the positioning member may be provided.

  Moreover, like the modification of one Embodiment of this invention shown in FIG. 4, the internal peripheral surface of the 1st connection hole 6b of the 2nd flange 6 and the 2nd connection hole 8b of the shaft part 8 is 1st screw hole 8a. The positioning member 12 has a tapered outer peripheral surface that fits into the tapered inner peripheral surfaces of both the connecting holes 6b and 8b. May be.

  Specifically, in this modification, the first connection hole 6b penetrates the second flange 6 in the axial direction, and the inner surface of the first connection hole 6b is on the opposite side from the end on the shaft 8 side. A range of a predetermined length toward the end is formed in a taper shape with a diameter decreasing toward the shaft 8 side. Further, the inner peripheral surface of the second connection hole 8b is formed in a taper shape whose diameter decreases as it goes toward the first screw hole 8a. In this modification, the positioning member 12 is inserted from the first connection hole 6b toward the second connection hole 8b so as to straddle the tapered portions of the connection holes 6b and 8b, and both the connection holes 6b. , 8b has a tapered outer peripheral surface that fits into the tapered inner peripheral surface. That is, the positioning member 12 has a frustoconical outer shape whose outer diameter decreases toward the first screw hole 8a in a state where the positioning member 12 is fitted into the tapered portions of both the connecting holes 6b and 8b.

  In the configuration of this modification, when the bolt 10 is tightened, the positioning member 12 is pressed toward the first screw hole 8a by the head portion 10b of the bolt 10, whereby the tapered outer peripheral surface of the positioning member 12 is connected to both. It is pressed against the tapered inner peripheral surfaces of the holes 6b and 8b. At this time, the pressing force from the positioning member 12 to the second flange 6 acts on the shaft portion 8 side, so that the friction force acting between the end surfaces of the second flange 6 and the shaft portion 8 that are in contact with each other can be increased. As a result, when the second flange 6 and the shaft portion 8 rotate together, the second flange 6 for countering the force in the rotational direction that acts between the second flange 6 and the shaft portion 8. The connection force with the shaft portion 8 can be further strengthened.

  Further, the member connecting structure and the method for forming the member according to the present invention can be applied to other than the connecting portion between the shaft portion 8 and the second flange 6 described above.

  For example, the member coupling structure and the method for forming the same according to the present invention are applied to a coupling portion between the one counterpart member and the first flange 4, a coupling portion between the other counterpart member and the outer cylinder 2, and the like. Also good.

  Also, an eccentric oscillating type of so-called internal oscillating type in which an internal gear is provided, the carrier has external teeth, and the carrier rotates together with external teeth that mesh with the internal teeth by oscillating the internal gear. The member coupling structure and the method for forming the member according to the present invention may be applied to a gear device.

  This internal gear swing type gear device is disclosed in, for example, Japanese Patent Laid-Open No. 2000-65158. That is, the carrier has a portion located on the radially inner side of the outer cylinder and is disposed coaxially with the outer cylinder. External teeth are provided on the outer peripheral surface of the carrier at a radially inner position of the outer cylinder. An annular gear member having inner teeth meshing with the outer teeth of the carrier is disposed between the carrier and the outer cylinder, and an eccentric portion of the crankshaft is fitted into the gear member. A through hole is formed. The crankshaft rotates by receiving a rotational force directly from the input shaft or via a spur gear. A plurality of crankshafts are provided in the circumferential direction of the carrier and are rotatably supported by the outer cylinder, and the gear member swings as the crankshaft rotates. Thereby, the carrier having the external teeth meshing with the internal teeth of the gear member rotates. As the carrier rotates, the second arm coupled to the carrier rotates relative to the first arm coupled to the outer cylinder. In such an internal tooth oscillating gear device, a coupling portion between the outer cylinder and the first arm that is one counterpart member, a coupling portion between the carrier and the second arm that is the other counterpart member, etc. The member coupling structure and the method for forming the same according to the present invention may be applied.

  Further, in a configuration in which the shaft portion 8 is formed integrally with the second flange 6 while the shaft portion 8 and the first flange 4 are formed separately, the shaft portion 8 and the first flange are formed. The connecting structure of the member of the present invention and the method for forming the connecting structure may be applied to the connecting portion to the connecting portion 4.

  Further, the number of external gears provided between the first flange 4 and the second flange 6 may be one or three or more.

2 Outer cylinder 3 Internal tooth pin (internal tooth)
4 First flange 6 Second flange (first member)
6b 1st connection hole 6c Step part 8 Shaft part (2nd member)
8a First screw hole 8b Second connection hole 10 Bolt 10a Screw part 10b Head 12 Positioning member 12a Second screw hole 13 Washer 16 Crankshaft 16a First eccentric part (eccentric part)
16b 2nd eccentric part (eccentric part)
22 1st external gear (external gear)
22c Insertion hole 24 2nd external gear (external gear)
24c insertion hole

Claims (7)

A first member provided with a first connection hole penetrating in a specific direction, and a first member disposed on one side of the first member in a direction in which the first connection hole extends and extending in the same direction as the first connection hole A member coupling structure for coupling a screw hole and a second member provided with a second connecting hole extending continuously from the first screw hole to the first member side,
A bolt having a screw portion that is inserted into the first connection hole and the second connection hole, and a portion on the tip side is screwed into the first screw hole;
A positioning member having a second screw hole, which is fitted so as to straddle the first connection hole and the second connection hole, and is screwed with a proximal end portion of the screw portion of the bolt;
The member positioning structure has a thickness such that the positioning member expands when the bolt is tightened. On the inner surface of the first connection hole, a step is provided so that the end on the second member side protrudes radially inward,
The member positioning structure according to claim 1, wherein the positioning member is provided with a washer that contacts the stepped portion and receives a head portion of the bolt when the bolt is tightened. The inner peripheral surfaces of the first connection hole and the second connection hole have a continuous tapered inner peripheral surface that decreases in diameter toward the first screw hole side,
The member positioning structure according to claim 1, wherein the positioning member has a tapered outer peripheral surface that fits into the tapered inner peripheral surface. An eccentric oscillating gear device to which the member coupling structure according to any one of claims 1 to 3 is applied,
An outer cylinder having a plurality of inner teeth on the inner surface;
A crankshaft rotatably provided in the outer cylinder and having an eccentric portion;
An external gear that is attached to the eccentric portion and that rotates in conjunction with the eccentric rotation of the eccentric portion while meshing with the internal teeth,
The first member and the second member are fastened to each other by the bolt and rotate integrally around the axis of the outer cylinder by transmitting the rotational force of the external gear,
The first connecting hole penetrates the first member in the axial direction of the outer cylinder, and the first screw hole and the second connecting hole extend in the same direction as the first connecting hole. Dynamic gear device. A first flange provided rotatably around the axis of the outer cylinder in the outer cylinder;
The external gear has an insertion hole penetrating in the axial direction of the outer cylinder,
The first member is a second flange disposed away from the first flange in the axial direction of the outer cylinder,
The eccentric oscillating gear device according to claim 4, wherein the second member is a shaft portion that extends from the first flange toward the second flange and is inserted into the insertion hole. It is a formation method of the joint structure of the member according to claim 1,
A step of aligning the first member and the second member so that the first connection hole and the second connection hole overlap;
After the alignment step, an insertion step of inserting the positioning member from the first connection hole toward the second connection hole so as to straddle the first connection hole and the second connection hole;
A bolting step including a bolt tightening step of screwing the bolt into the first screw hole of the second member and the second screw hole of the positioning member after the inserting step; Forming method. It is a manufacturing method of the eccentric rocking | fluctuation type gear apparatus of any one of Claims 2-5,
A step of aligning the first member and the second member so that the first connection hole and the second connection hole overlap;
After the alignment step, an insertion step of inserting the positioning member from the first connection hole toward the second connection hole so as to straddle the first connection hole and the second connection hole;
An eccentric oscillating gear comprising a bolt tightening step of screwing the bolt into the first screw hole of the second member and the second screw hole of the positioning member after the inserting step. Device manufacturing method.

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