JP2007015039A - Bearing fitting device and bearing fitting method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bearing fitting device capable of speedily carrying out fitting work of an outer ring, which each of two bearings has, into a housing in which the ring is to be fitted. <P>SOLUTION: This bearing fitting device is constituted to be furnished with two holders 152, 250 to hold each of the two outer rings 30, 32 so that it is respectively positioned on the outside of each of axes of bearing storage recessed parts 46, 48 provided in the housing 12 and a holder relative movement device 104 to relatively move these holders in a direction to approach each other, and the two outer rings are simultaneously fitted in the housing by making the two outer ring relatively approach each other by relatively moving the two holders by the holder relative movement device. It is possible to simultaneously fit the two outer rings and to speedily carry out the fitting work of the two outer rings by one motion of relative approaching movement of the two holders by using this bearing fitting device. <P>COPYRIGHT: (C)2007,JPO&amp;INPIT

Description

  The present invention relates to an apparatus for fitting two bearings or their outer rings into a shaft holder so as to rotatably hold the shaft body on the shaft holder, and to fit two bearings or their outer rings into the bearing holder. Related to the method.

  In an assembly having a rotatable shaft body, a bearing is used to rotatably hold the shaft body on the shaft holder. In order to hold the shaft body on the shaft holder while receiving a radial load, the two bearings are usually arranged coaxially with each other at positions separated in the axial direction. In that case, these bearings are generally incorporated in a state in which they are fitted (for example, press-fitted) into two bearing housing recesses formed on the shaft holder so as to face each other. When the two bearings are a pair of angular bearings, only the outer rings (outer races) of the angular bearings are often inserted in advance. In assembling such an assembly having two bearings, the two bearings or their outer rings (hereinafter sometimes abbreviated as “bearings etc.”) are inserted into the shaft holders one by one at present. Has been done. Specifically, it is common practice to insert only one of the two bearings and the like and insert the other of the two bearings after the insertion.

  As described above, fitting two bearings or the like one by one into the shaft holder is one factor that increases the number of work steps in the assembly work of the assembly. The present invention has been made in view of such circumstances, and it is an object of the present invention to provide a bearing insertion device and a bearing insertion method capable of quickly performing an insertion operation into a shaft holder such as two bearings. And

  According to the present invention, each of two bearings and the like that receive at least a radial force is disposed between them in an axial direction so that the shaft body can be rotatably held by the shaft holder. The shaft holding body is applied to an operation for fitting into each of the two bearing receiving recesses provided to face each other in the axial direction, and the bearing insertion device of the present invention includes two bearings and the like. Two holders for holding each of them so as to be positioned at a predetermined position corresponding to each of the two bearing housing recesses, and a holder relative movement device for relatively moving the holders in the approaching direction. In addition, two holders and the like are moved closer to each other by the relative movement of the two holders by the holder relative movement device, and the two bearings and the like are fitted into the shaft holder. Further, the bearing insertion method of the present invention is such that each of the two bearings is positioned at a predetermined position with respect to each of the two bearing housing recesses, and the two bearings are moved relative to each other in a direction approaching each other. The two bearings and the like are fitted into the shaft holder.

  According to the bearing insertion device of the present invention, it is possible to insert two bearings or the like into the shaft holder at one time by one operation of relative approach movement of the two holders, and the bearing insertion method of the present invention. Accordingly, the two bearings and the like can be fitted into the shaft holder at one time by one process of relative approach of the two bearings and the like. Therefore, according to the bearing insertion device or the bearing insertion method of the present invention, it is possible to quickly perform the fitting operation to the shaft holder such as two bearings.

Aspects of the Invention

  In the following, some aspects of the invention that can be claimed in the present application (hereinafter sometimes referred to as “claimable invention”) will be exemplified and described. As with the claims, each aspect is divided into sections, each section is numbered, and is described in a form that cites the numbers of other sections as necessary. This is merely for the purpose of facilitating the understanding of the claimable inventions, and is not intended to limit the combinations of the constituent elements constituting those inventions to those described in the following sections. In other words, the claimable invention should be construed in consideration of the description accompanying each section, the description of the embodiments, etc., and as long as the interpretation is followed, another aspect is added to the form of each section. In addition, an aspect in which constituent elements are deleted from the aspect of each item can be an aspect of the claimable invention. In the following items, each of items (1) to (6) corresponds to each of claims 1 to 6, and each of items (11) to (13) is claims 7 to It corresponds to each of items 9.

(1) Two bearings or outer rings of the two bearings which receive at least a radial force and are spaced apart from each other in the axial direction in order to rotatably hold the shaft body in a state of passing through the shaft holder. A bearing insertion device that inserts each into each of two bearing housing recesses provided on the shaft holding body so as to face each other in the axial direction,
(A) a first holder for holding one of the two bearings or an outer ring thereof in a state of being positioned on an axis outside one of the two bearing housing recesses; and (B) the two bearings or A second holder for holding the other outer ring in a state of being positioned on the axis outside the other of the two bearing housing recesses; and (C) the first holder and the second holder. A holder relative movement device that relatively moves in the direction in which they approach in the axial direction, and by moving the first holder and the second holder relative to each other by the holder relative movement device, the two A bearing insertion device characterized in that a bearing or an outer ring of the bearing is relatively moved in an axial direction so as to approach each other, and each of them is inserted into each of the two bearing receiving recesses.

  The “holding tool relative movement device” referred to in this section does not move the two holding tools separately, but means that moves the two holding tools relative to each other by one operation. If the two holders can be moved relatively close to each other by such a holder relative movement device, each of the two bearings and the like held by each of the two holders is used as the shaft holder, specifically, the shaft. Each of the two bearing receiving recesses provided in the holding body can be fitted at a time by one operation. Therefore, according to the bearing insertion device of this aspect, it becomes possible to quickly insert two bearings or the like into the shaft holder.

  A bearing or the like to be inserted by the bearing insertion device of this section may be a sliding bearing or a rolling bearing. Further, it may be a radial bearing or an angular bearing. Specifically, for example, radial rolling bearings and angular rolling bearings using balls, rollers, needles or the like as rolling elements are targeted. In particular, in an angular rolling bearing or the like, only the outer ring that it has may be fitted into the shaft holder, and in such a case, as one or both of the two bearings or the like, the outer ring that those bearings have, It is possible to make it the object of insertion of the bearing insertion device of this term.

  In general, when a bearing or the like is inserted into the bearing receiving recess, the bearing is inserted until the insertion end of the bearing or the like comes into contact with the bottom of the bearing receiving recess. In view of that, by setting the relative approach distance between the two holders according to the separation distance between the insertion ends of the two bearings and the like after the insertion, the insertion depth of each of the two bearings and the like is set appropriately. It becomes possible to make depth. Moreover, since the load with respect to the relative movement of the two holders suddenly increases when the fitting ends of both of the two bearings abut against the bottom of the bearing receiving recess, the change in the load is detected. Also, insertion with an appropriate insertion depth can be executed.

  (2) When the two bearings or the outer rings thereof are fitted into the two bearing receiving recesses, the first holding tool and the holding tool relative movement device are not relatively movable in the axial direction. In addition, the bearing fitting device according to (1), wherein the holder relative movement device is configured to move the second holder toward the first holder.

  At the time of insertion, that is, when the holder relative movement device performs the insertion operation, both of the two holders can be structured to be movable in the axial direction with respect to the holder relative movement device. The structure of the bearing insertion device can be simplified by adopting a structure in which the relative movement between the one holder and the holder relative movement device is impossible at the time of insertion as in the aspect of this section. In addition, the aspect of this term does not exclude a structure that allows relative movement between the first holding tool and the holding tool relative movement device except during insertion. For example, in the approaching operation of the first holder to the shaft holder up to the position where the insertion operation is started, the retracting operation of the first holder from the shaft holder after completion of the insertion, etc., the first holder and the holder A mode in which relative movement with the relative movement device is performed is also included in the mode of this section.

  (3) A support / device relative movement allowance mechanism that includes a shaft support support that supports the shaft support, and that allows relative movement in the axial direction between the shaft support and the relative movement device. The bearing insertion device according to item (2), comprising:

  When inserting two bearings or the like into each of the two bearing receiving recesses facing away from each other, due to differences in diameter, insertion allowance, etc., the insertion resistance into one bearing receiving recess such as one bearing and the other The insertion resistance to the other bearing receiving recess such as a bearing may be different. In such a case, a phenomenon may occur in which any of the bearings or the like is inserted in advance and the remaining bearings or the like are inserted after the insertion. The aspect of this section has been made in consideration of such circumstances, and according to the aspect of this section, even if such a phenomenon occurs, proper insertion of two bearings or the like is guaranteed. Is done. Note that the shaft holder support tool corresponds to a table on which the shaft holder is placed, but is not limited to the one that directly supports the shaft holder. You may support a shaft holding body indirectly in the state which interposed the member.

  (4) The bearing insertion device according to (3), wherein the shaft holder support is not movable in the axial direction, and the holder relative movement device is movable in the axial direction.

  The aspect of this term is an aspect in which in the above aspect, the position of the shaft holder support tool is fixed and the movement of the holder relative movement device is allowed. In consideration of detachment and loading / unloading of the shaft holder, it is desirable that the position of the shaft holder support is fixed from the viewpoint of workability. According to the aspect of this section, since the shaft holder support is not movable in the axial direction, a bearing insertion device with good workability is realized.

(5) Each of the first holder and the second holder has a through-hole penetrating in the axial direction.
The holder relative movement device is capable of (a) penetrating both the first holder and the second holder, and the first holder of the second holder in a state of passing through both of them. A rod having a latching portion capable of latching a portion located on the opposite side; and (b) a rod moving device for moving the rod in the axial direction, wherein the latching portion is the second holding tool. The rod is moved in a direction from the second holder toward the first holder in a state of engaging the first holder, so that the first holder and the second holder are relatively moved in the direction in which they approach each other. The bearing insertion device according to any one of (2) to (4), which is structured.

  In short, the mode of this section is a mode in which the two bearings and the like are fitted so that the rods are passed through the two holding tools and the other holding tool is drawn toward one of the holding tools. is there. Therefore, the aspect of this item has an advantage that most parts of the holder relative movement device can be disposed on the first holder side to perform the fitting operation. For example, this is an effective mode when it is difficult to fit the other side due to the shape of the shaft holder or the like. In addition, according to the aspect described in this section, only a tensile force along the axial direction acts on the rod, and a force that tilts with respect to the axial line does not act. And an appropriate insertion work can be performed.

(6) The rod moving device moves the rod in the axial direction between a position that penetrates both the first holder and the second holder and a position that does not penetrate the second holder. Is supposed to
The holding tool relative movement device is a hooking state in which the rod is passed through both the first holding tool and the second holding tool to switch whether the second holding tool is hooked by the hooking portion. The bearing insertion device according to item (5), which has a switching mechanism.

  In the aspect in which the rod is inserted and inserted, it is desirable that the rod is retracted from at least one of the holders when the shaft holder is detached or attached. The aspect described in this section is an aspect that takes that into consideration, and when the insertion operation is performed, the rod penetrates through the two holding tools and is engaged with one of the holding tools. In a case where it is not performed, the rod can be in a state of being extracted from at least one holding tool.

(11) Two bearings or outer rings of the two bearings which receive at least a radial force and are spaced apart from each other in the axial direction in order to hold the shaft body rotatably in a state of passing through the shaft holder. A bearing insertion method in which each is inserted into each of two bearing housing recesses provided on the shaft holder so as to face each other in the axial direction,
Each of the two bearings or the outer ring thereof is positioned on an axis outside each of the two bearing receiving recesses;
A bearing insertion method, wherein the two bearings or the outer ring thereof are moved relative to each other in a direction in which they approach each other in the axial direction, and each of them is inserted into each of the two bearing receiving recesses.

  The relative movement of the two bearings and the like referred to in this section means that the two bearings and the like are moved relative to each other by one operation, rather than moving them separately and independently. Thus, according to the aspect of this section in which the two bearings and the like are relatively approached, each of the two bearings and the like can be fitted into the shaft holding body at one time by one process. Therefore, according to the bearing insertion method of this aspect, it is possible to quickly insert two bearings or the like into the shaft holder.

  The following modes including this section are various modes of the bearing insertion method. Since the technical feature of the bearing insertion method as the claimable invention is the same as that of the bearing insertion device described above, the description of the bearing insertion method will be omitted. Moreover, although description of a specific aspect is abbreviate | omitted, the bearing insertion method of the various aspects which took in the technical feature of each aspect of the said bearing insertion apparatus can also become a claimable invention.

  (12) In a state in which any one of the two bearings or one of the outer rings thereof, the other thereof, and the shaft holder is prohibited from moving in the axial direction, the two bearings or The bearing fitting method according to item (11), wherein the outer ring is relatively moved in the direction in which the outer ring approaches in the axial direction.

  The aspect of this section is an effective aspect in the case where the insertion resistances of the two bearings and the like are different as described above.

  (13) The bearing insertion method according to item (12), in which the two bearings or the outer ring thereof are relatively moved in a direction in which they are approached in the axial direction in a state where the movement of the shaft holder in the axial direction is prohibited. .

  According to the aspect described in this section, it is possible to enjoy the advantages of fixing the shaft holder as described above.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition to the following examples, the present invention is implemented in various modes including various modes modified and improved based on the knowledge of those skilled in the art, including the mode described in the above [Mode of Invention]. be able to.

<Work object of bearing insertion device>
The bearing insertion apparatus of an Example is an apparatus which shares a part of assembly operation of the final reduction gear apparatus for vehicles. An intermediate assembly that is in the process of assembling the final reduction gear is shown in FIGS. 1 is a front view, FIG. 2 is a side cross-sectional view, and FIG. 3 is an exploded view of the side cross-section. The intermediate assembly 10 includes a housing 12 as a shaft holder and a bevel gear 14 (also referred to as a “pinion”) as a shaft body rotatably held in the housing 12. In the housing 12, a differential case (not shown) including a differential case and a differential small gear and a differential large gear disposed therein is disposed, and the bevel gear 14 is connected to the final reduction gear. It functions as a reduction small gear as an input gear in the apparatus, and meshes with a reduction large gear provided outside the differential case.

  The housing 12 is provided with a holding hole 16, and the housing 12 holds the bevel gear 14 in the holding hole 16. The bevel gear 14 is formed integrally with the shaft portion 18, the gear portion 20 provided integrally with the shaft portion 18 at the upper end portion in the drawing of the shaft portion 18, and the shaft portion 18 at the lower end portion of the shaft portion 18 in the drawing. The shaft portion 18 is formed in the holding hole 16 of the housing 12 with two angular tapered roller bearings 26 and 28 (hereinafter simply referred to as “angular”. The bevel gear 14 can be rotated with respect to the housing 12 by being held via the bearings 26 and 28 ”.

  More specifically, the two angular bearings 26 and 28 are respectively held by outer races 30 and 32 which are outer rings, inner races 34 and 36 which are inner rings, and outer races 30 and 32 which are held by retainers 38 and 40, respectively. A plurality of tapered rollers 42, 44 as rolling elements interposed between the inner races 34, 36 are configured, and each of the outer races 30, 32 is provided in the holding hole 16 provided in the housing 12. Are inserted into bearing housing portions 46 and 48 (each of which functions as a “bearing housing recess”), and each of the inner races 34 and 36 is fitted with a large portion of the shaft portion 18 of the bevel gear 14. Each of the diameter part 50 and the small diameter part 52 is fitted. A portion where the inner diameter between the bearing housing portion 46 and the bearing housing portion 48 is reduced (hereinafter may be referred to as an “access prohibition portion 54”), that is, a compartment defined by the bottom surfaces of the two bearing housing recesses. The formed portion is sandwiched between the outer races 30 and 32 of the angular bearings 26 and 28, and the outer races 30 and 32 are prohibited from approaching each other.

  An annular washer 56 is fitted to the shaft portion 18, and the washer 56 is sandwiched between the inner race 34 of the angular bearing 26 located at the upper side of the figure and the lower end surface of the gear portion 20 of the bevel gear 14. ing. The shaft portion 18 is fitted with a short cylindrical spacer 58 whose central portion in the axial direction protrudes in the radial direction over the entire circumference. The spacer 58 is an inner race 34 of each of the angular bearings 26 and 28. , 36. Further, a male screw portion 60 formed with a male screw is formed at the lower portion of the shaft portion 18 in the drawing, and a tightening nut 62 (hexagonal nut) is screwed into the male screw portion 60, whereby the inner race 34 is obtained. 36 are sandwiched between the gear portion 20 and the tightening nut 62 with a spacer 58 interposed therebetween.

  By rotating the tightening nut 62 and tightening the two angular bearings 26 and 28, the inner races 34 and 36 are in a state of receiving a force in a direction approaching each other, and in this state, the shaft of the bevel gear 14 with respect to the housing 12 is placed. The position in the direction will be fixed. Incidentally, the spacer 58 is plastically deformed so that the axial dimension is reduced in a state where the two angular bearings 26 and 28 are tightened, but the force in the direction in which the inner races 34 and 36 are separated from each other by the spring back. And the loosening of the tightening nut 62 is effectively prevented.

  The bearing insertion device of the present embodiment performs an outer race insertion operation (a kind of bearing insertion operation) which is a part of the assembly operation of the intermediate assembly 10. As shown in FIG. 4 (FIG. 4A shows a state before insertion, and FIG. 4B shows a state after insertion), the bearing housing portions 46 and 48 provided in the housing 12 are shown in FIG. This is an operation of fitting each into the outer races 30, 32 of the angular bearings 26, 28. The outer diameter of each of the outer races 30 and 32 is slightly larger than the inner diameter of each of the bearing housing portions 46 and 48, and the outer races 30 and 32 are fitted into the bearing housing portions 46 and 48, respectively.

  In the following description, when the angular bearings 26 and 28 and their outer races 30 and 32 are referred to separately, “upper angular bearing 26”, “lower angular bearing 28”, “upper outer race 30”, “lower The outer outer race 32 is referred to as “the upper outer bearing housing portion 46” and the “lower bearing housing portion 48”.

<Configuration of bearing insertion device>
A front view of the bearing insertion device of the present embodiment is shown in FIG. 5, and a right side view thereof is shown in FIG. Roughly speaking, the bearing insertion device 100 is disposed at the upper portion of the apparatus main body 102, an insertion operation execution apparatus 104 that is provided in the apparatus main body 102 and is a main apparatus for performing the insertion operation, and the apparatus main body 102. It includes an upper device 106 that is an auxiliary device, a carry-in conveyor device 108 for carrying the housing 12 to be fitted into the work position, and a carry-out conveyor device 110 for carrying the housing 12 out of the work position. It consists of

  The apparatus main body 102 includes a base 120, four columns (columns) 122 erected on the base 120, a base plate 124 supported by the columns 122, and a frame that is erected on the base plate 124 and forms a gate shape. 126 and two support plates 128 erected on the frame 126. A pair of support members 130 that are generally formed in a plate shape are erected and fixed on the upper surface of the center portion of the base plate 124 in a state where they are arranged in parallel in the front-rear direction. The housing 102 mounted on a pallet 132 (which will be described in detail later) having a generally L-shaped cross section is fixedly supported at the insertion work position where the insertion work is performed. Further, one end of each of the carry-in conveyor device 108 and the carry-out conveyor device 110 is fixed to the base plate 124 (not shown in FIG. 6). Incidentally, the upper surfaces of the two support members 130 and the conveying surfaces of the carry-in conveyor device 108 and the carry-out conveyor device 110 are at the same height position so that the pallet 132 can easily move between them.

  The upper device 106 includes a front / rear cylinder device 140 fixed to the upper ends of the two support plates 128 of the device main body 102, a vertical cylinder device 142 moved forward and backward by the front / rear cylinder device 140, and a vertical cylinder device 142. And an upper holder unit 144 that is moved to the position. Referring also to FIG. 7 showing an enlarged cross-sectional view of the main part of the bearing insertion device 100, the upper holder unit 144 includes a base plate 146 fixed to the lower end portion of the cylinder rod of the upper and lower cylinder device 142. Two guide shafts 148 suspended from the substrate 146, a holder support member 150 movable in the vertical direction along the guide shaft 148, and an upper holder fixedly supported by the holding part support member 150 152.

  The holder support member 150 is generally L-shaped when viewed from the side, and is provided with a pair of extending portions 154 extending to the left and right. Since each of the two guide shafts 148 passes through the through hole provided in the extending portion 154, the holder support member 150 is guided by the two guide shafts 148. It has become. A compression coil spring 156 is disposed at the lower end of each of the two guide shafts 148 so that the lower end is supported by the lower end of each of the two guide shafts 148, and the upper ends of each of the two springs 156 are extended to a pair. Each of the protruding portions 154 is urged upward. Therefore, the upper end of the holder supporting member 150 is positioned at the upper end position where the upper end of the holder supporting member 150 is in contact with the substrate 146.

  The upper holder 152 has a generally annular shape having a through hole 158, and is supported by the holder support member 150 in such a posture that the axis of the through hole 158 extends in the vertical direction. The upper holder 152 is configured to hold the outer race 30 (upper outer race 30) of the upper angular bearing 26 described above at the outer peripheral portion. More specifically, a plurality of ball plungers (not shown) are attached to the lower end portion of the upper holder 152 along the outer periphery, and the lower end portions of the inner peripheral surface of the upper outer race 30 are hooked by these ball plungers. By being stopped, the upper outer race 30 is held by the upper holder 152 in a state where it can be easily detached downward.

  The insertion work execution device 104 includes a generally plate-shaped base 170, a mechanism portion 172 attached to the base 170, and an electric motor 174. The base 170 is provided with four through holes, and a sleeve 176 is provided so as to be inserted into each of the through holes. Each of the four sleeves 176 is in a state in which each of the four columns 122 constituting the apparatus main body 102 is inserted, and the insertion work execution device 104 is movable up and down using the column 122 as a guide. . Four balance cylinders 178 are attached to the base 120, and the base 170 is supported by the balance cylinders 178. With such a structure, the insertion work execution device 104 can be moved up and down with a relatively small force.

  Referring also to FIG. 7, the mechanism unit 172 of the insertion work execution device 104 includes a threaded rod 180 in which a ball screw is formed, and a nut that holds the bearing ball and is screwed into the threaded rod 180. 182. In short, the nut 182 is rotated by the electric motor 174 so that the threaded rod 180 moves up and down.

  More specifically, the nut 182 is accommodated in a generally cylindrical nut case 184 and the upper part is pressed by the fixed ring 186, and the nut 182 is not rotatable with respect to the nut case 184 and cannot be moved in the axial direction. ing. The nut case 184 is rotatably held by a nut case holding cylinder 188 fixed to the through hole of the base 170 via two angular ball bearings 190 and 192. The outer races of the two angular ball bearings 190 and 192 are fixed to the nut case holding cylinder 188 by a fixing ring 194, and the inner race is fixed to the nut case 184 by a fixing nut 196. It is impossible to move in the axial direction with respect to the case holding cylinder 188. With such a structure, the nut 182 is rotatable with respect to the base 170 and is not movable in the axial direction. A pulley 198 is fixedly attached to the lower part of the nut case 184. A belt 202 is connected to the pulley 198 and the pulley 200 fixedly attached to the main shaft of the electric motor 174. It is wound (see FIG. 6). By rotating the electric motor 174, the rotational driving force is transmitted by the belt 202, and the nut 182 is rotated. Note that a load cell 206 is attached to the upper end portion of the nut case holding cylinder 188 with a fixed ring 204, and the load cell 206 detects an upward biasing force acting on the nut 182. .

  On the other hand, the threaded rod 180 has a threaded portion 210 in which a ball screw is formed, and is screwed to the nut 182 at the threaded portion 210. The lower end portion of the threaded rod 180 is supported by a rod support plate 214 that is movable up and down along two guide shafts 212 that are suspended and fixed to the base 170. More specifically, the rod support plate 214 is provided with two through holes, and a sleeve 216 is attached so as to fit into each of the through holes. Since the guide shaft 212 is inserted into the two sleeves 216, the rod support plate 214 is movable in the vertical direction. Further, the rod support plate 214 is provided with a support hole 218 which is a through hole, and the lower portion of the threaded rod 180 is inserted into the support hole 218. A flanged end tube 220 is fitted and fixed to the lower end portion of the threaded rod 180, and the flange portion of the flanged end tube 220 is connected to the holding ring 222 attached to the lower surface of the rod support plate 214 and the rod. By being gently sandwiched between the support plate 214, the threaded rod 180 is rotatable with respect to the rod support plate 214 and is not movable in the axial direction.

  A lever 224 is fixed to the flange portion of the flanged terminal tube 220, and this lever 224 is attached to the tip of the cylinder rod of the rod rotating cylinder 226 whose rear end is rotatably supported by the rod support plate 214. , Are rotatably connected. When the operation of the rod rotating cylinder 226 is stopped, the threaded rod 180 is prohibited from rotating with respect to the rod support plate 214, and the rod rotating cylinder 226 is operated, whereby the threaded rod 180 is It is rotated with respect to the support plate 214. The rod rotating cylinder 226 rotates the threaded rod 180 by about 90 °, and the clamping ring 222 that clamps the flanged terminal tube 220 has a shape in which a portion where the lever 224 exists in the rotation range is cut out. It has become.

  When the nut 182 is rotated in a state where the rotation of the threaded rod 180 with respect to the rod support plate 214 is prohibited by the structure as described above, the threaded rod 180 is in a state where the rotation is prohibited. It is guided by the guide shaft 212 together with the support plate 214 to move up and down, and by operating the rod rotating cylinder 226 at any moving position, the threaded rod 180 can be rotated 90 ° at that position. become.

  The mechanism portion 172 of the insertion work execution device 104 includes an outer cylinder 240 fixed to the upper surface of the base 170 in a state surrounding the nut case holding cylinder 188, and an upper support disc 242 fixed to the upper end portion of the outer cylinder 240. And an advancing cylinder holding cylinder 244 having a generally bottomed cylindrical shape that is fitted and fixed in a through hole provided in the center of the upper support disc 242. A through hole is provided in the bottom of the advance cylinder holding cylinder 244, and a portion of the threaded rod 180 that is located above and continuing to the threaded portion 210 extends upward through the through hole. Yes. An advancing cylinder 246 (which will be described later in terms of the shape of the flange portion, etc.) having a flange portion at the lower end is disposed in a state of being fitted onto the threaded rod 180 and held on the inner peripheral surface of the advancing cylinder holding cylinder 244 Has been. The advancing cylinder 246 is held so as to be movable in the vertical direction, and as will be described in detail later, is advanced above the advancing cylinder holding cylinder 244. As will be described in detail later, a locking ring 248 for restricting the advancement of the advancement tube 246 is attached to the upper end portion of the advancement tube holding tube 244.

  A generally cylindrical lower holder 250 is fixedly supported on the upper end portion of the advancing cylinder 246. The lower holder 250 is configured to hold the outer race 32 (upper outer race 32) of the lower angular bearing 28 described above at the outer peripheral portion. More specifically, the lower holder 250 is provided with a plurality of ball plungers (not shown) along the outer periphery, and the upper end of the inner peripheral surface of the lower outer race 32 is hooked by these ball plungers. Thus, the lower outer race 32 is held by the lower holder 250 in a state where it can be easily detached upward. The space defined by the inner peripheral surface of the lower holder 250 functions as a through hole, and the upper end portion of the threaded rod 180 also extends through the lower holder 250 and extends from the upper end thereof.

  Specifically, the threaded rod 180 includes a large-diameter portion 260 that is a relatively large-diameter portion that is directly continuous with the threaded portion 210 and a portion that is positioned above the threaded portion 210 of the threaded rod 180. And a small-diameter portion 262 which is a relatively small-diameter portion located above the large-diameter portion. The small diameter portion 262 extends through the upper end opening of the advancing cylinder 246 and extends upward. The large diameter portion 260 is larger than the inner diameter of the upper end opening of the advancing cylinder 246 and slightly smaller than the inner diameter of the advancing cylinder 246. A sliding key 264 is fitted on the outer peripheral portion. The sliding key 264 has a width slightly larger than the width of the sliding key 264 and is fitted into a key groove 266 provided in the axial direction on the inner peripheral surface of the advancing cylinder 246. The sliding key 264 and the key With the groove 266, the advancing cylinder 246 is not rotatable with respect to the threaded rod 180 and is movable in the axial direction.

  When the threaded rod 180 is moved upward by the rotation of the electric motor 174, the upper end of the large-diameter portion 260 of the threaded rod 180 comes into contact with the periphery of the upper end opening of the advancing cylinder 246, and further threaded rod By the movement of 180, the advancing cylinder 246 moves upward together with the threaded rod 180 so as to be lifted by the large diameter portion 260, and advancing upward from the upper end portion of the advancing cylinder holding cylinder 244. As shown in FIG. 8 (b), the advancing cylinder 246 has a flange portion provided with a pair of flanges 268 facing away from each other across the axis at the lower end portion thereof (FIG. 11, FIG. 8). 12), and the upper end opening 270 of the advancing cylinder holding cylinder 244 has substantially the same shape as the outer shape of the flange portion of the advancing cylinder 246, and is slightly larger than the outer shape. Therefore, the advancing cylinder 246 can be advanced upward with the lower end exceeding the upper end of the advancing cylinder holding cylinder 244. On the other hand, the locking ring 248 is an annular shape having a hole whose inner diameter is slightly larger than the outer diameter of the advancing cylinder 246, so that a pair of flanges 268 provided on the advancing cylinder 246 are locked. The advance of the advance tube 246 is limited. As will be described in detail later, when the advancing cylinder 246 is positioned at the advancing end position, if the rod rotating cylinder 266 is operated to rotate the threaded rod 180 by 90 °, the advancing cylinder 246 rotates 90 ° ( In this state, the pair of flanges 268 of the advancing cylinder 246 are locked to the upper end surface of the advancing cylinder holding cylinder 244, so that the advancing cylinder 246 is prevented from descending. Will be.

  Moreover, the shape of the front-end | tip part 272 of the threaded rod 180 has a pair of overhanging protrusions 274 that protrude from each other across the axis, as shown in FIG. As will be described in detail later, the threaded rod 180 also penetrates the above-described upper holder 152 so that the distal end portion 272 protrudes above the upper holder 152. The through hole 158 provided in the upper holder 152 is a hole slightly larger than the small diameter portion 262 of the threaded rod 180 and a pair of recesses 276 into which the pair of protruding protrusions 274 of the tip end portion 272 can be inserted. The threaded rod 180 is rotated by the rod rotating cylinder 266 in a state where the tip end portion 272 protrudes above the upper holder 152, and the threaded rod 180 moves downward in this state. Then, the lower end surfaces of the pair of overhanging protrusions 274 come into contact with the upper surface of the upper holder 152, and the tip 272 of the threaded rod 180 hooks the upper holder 152 (FIG. 8A). )).

  The bearing insertion device 100 is controlled by a control device (not shown) (mainly a computer). The electric motor 174 is a servo motor, and is configured such that the rotation angle of the electric motor 174 is always grasped during operation of the bearing insertion device 100, and the insertion operation is performed based on the rotation angle. The vertical position of the threaded rod 180 included in the device 104 can also be grasped.

<Bearing operation and operation of the bearing insertion device>
Below, the bearing insertion method of two bearings (specifically, the outer race insertion method of these bearings) performed using the bearing insertion device 100 of the present embodiment will be described. In the bearing insertion operation using the bearing insertion device 100, first, the upper outer race 30 and the lower outer race 32 are mounted on the upper holder 152 and the lower holder 250, respectively. 6 shows a state in which the upper holder 152 is positioned at the front moving end by the upper device 106, more specifically, by the front / rear cylinder device 140 and at the lower movement end by the upper / lower cylinder device 142. When the upper outer race 30 is mounted, the upper holder 152 is positioned at the front moving end and the upper moving end, and the upper outer race 30 is mounted at that position. Further, the insertion work execution device 104 is in the state shown in FIG. 7, and the lower outer race 32 is attached to the lower holder 250 in this state.

  Next, the housing 12 that has already been carried in to the front of the support member 130 is placed on the support member 130 by the carry-in conveyor device 108, and is fixed at a fitting operation position that is a predetermined position on the support member 130. The housing 12 is fixed to the pallet 132, and the mounting of the housing 12 on the support member 130 is performed together with the pallet 132. The housing 12 is fixed at the insertion work position by a fixing mechanism (not shown). This is done by being fixed at a predetermined position. The state in which the housing 12 is fixed at the insertion work position is the state shown in FIG. 7. In this state, the axis of the shaft holding hole 16 provided in the housing 12, that is, the axis of the bearing housing portions 46 and 48 is The axes are aligned in the vertical direction, and their axes are made to coincide with the axes of the threaded rod 180 provided in the insertion work execution device 104. By fixing the housing 12 to the insertion work position, the lower outer race 32 held by the lower holder 250 is positioned on the outer side on the axis of the bearing accommodating portion 48. The pallet 132 is provided with a work hole 280 centered on the axis, and the fitting work is performed by the fitting work execution device 104 through the work hole 280.

  After the pallet 12 is positioned at the insertion work position, a control switch of the bearing insertion device 100 is started by operating a start switch (not shown). If the control operation can be started, first, the upper holder 152 is positioned at the lower moving end by the upper and lower cylinder devices 142 included in the upper device 106, and then, at that position, the upper holder 152 is moved by the front and rear cylinder devices 140. Is positioned at the rearward moving end. The state in which the upper holder 152 is positioned at the lower movement end and the rear movement end is the state shown in FIG. 7. In this state, the upper outer race 30 held by the upper holder 152 is connected to the bearing housing portion 46. It will be located outside on the axis.

  Subsequently, the rotation of the electric motor 174 is started, whereby the rotation of the nut 182 is started, and the threaded rod 180 starts to move upward. In this operation, the nut 182 is rotated clockwise as viewed from above. By the rotation of the nut 182 and the upward movement of the threaded rod 180, the insertion work execution device 104 reaches the state shown in FIG. In this state, the upper end surface of the large-diameter portion 260 of the threaded rod 180 is in contact with the periphery of the upper end opening of the advancing cylinder 246 from below. When this state is exceeded and the nut 182 continues to rotate, the advancing cylinder 246 also advances upward together with the threaded rod 180, and the lower holder 250 fixed to the upper part of the advancing cylinder 246 also moves upward. As a result, the lower outer race 32 held by the lower holder 250 is also moved upward so as to approach the bearing housing portion 48, and the upper portions of the tip 272 and the small diameter portion 262 of the threaded rod 180 are The upper holding tool 152 is passed through the through hole 158. This operation is performed until the state shown in FIG. 10 is reached, and the rotation of the electric motor 174 is stopped in a state where the threaded rod 180 is located at the position shown in FIG.

  In the state shown in FIG. 10, the advancing cylinder 246 is positioned slightly in front of the advancing end position limited by the locking ring 248, and the tip end portion 272 of the threaded rod 180 is located above the upper holder 152. Between the upper surface and the lower end of the tip 272 with a slight margin. In a state where the threaded rod 180, the advance cylinder 246, and the lower holder 250 are fixed, the rod rotating cylinder 226 operates so as to extend, and the threaded rod 180 is rotated 90 ° clockwise as viewed from above. . The state where the threaded rod 180 is rotated is the state shown in FIG.

  In the state shown in FIG. 11, as described above, the upper holder 152 can be hooked by the tip 272 of the threaded rod 180 (see the two-dot chain line in FIG. 8A). The pair of flanges 268 of the advancing cylinder 246 can be brought into contact with the upper end surface of the advancing cylinder holding cylinder 244 so that the advancing cylinder 246 can be hooked by the advancing holding cylinder 244 ( (See the two-dot chain line in FIG. 8B). The rotation of the threaded rod 180 causes the threaded rod 180 to be lowered by ¼ pitch of the ball screw formed on itself, but the upper surface of the upper holder 152 and the lower end of the distal end portion 272 And the margin between the pair of flanges 268 of the advancing cylinder 246 and the upper end surface of the advancing cylinder holding cylinder 244 exceeds the descending amount. There will be no hindrance.

  After the state shown in FIG. 11 is realized, the electric motor 174 is started to rotate in the direction opposite to the previous rotation, and the counterclockwise rotation as viewed from above the nut 182 is started. Accordingly, the operation of inserting the outer races 30 and 32 into the bearing housing portions 46 and 48 by the bearing insertion device 100 is started. In this fitting operation, the threaded rod 180 is moved downward, and accordingly, the upper holder 152 is hooked by the tip 272 of the threaded rod 180, so that the upper holder with respect to the threaded rod 180 is engaged. The relative movement upward of 152 is prohibited, and the advancement cylinder 246 is hooked by the advancement holding cylinder 244, so that the advancement cylinder 246 relative to the advancement holding cylinder 244, that is, the base 170 of the insertion work execution device 104. Relative movement toward the lower side of the lower holder 250 is prohibited.

  If the threaded rod 180 is moved downward by further continuing the rotation of the nut 182 in a state where the upper holder 152 and the advancing cylinder 244 are hooked, the upper holder 152 and the lower holder 250 are moved. The upper outer race 30 and the lower outer race 32 are relatively moved closer to each other so as to approach each other. By such insertion operation, the upper outer race 30 and the lower outer race 32 are inserted into the bearing accommodating portions 46 and 48 of the housing 12, respectively. The upper holder 152 supported by the holding portion support member 150 is allowed to move downward with the compression of the compression coil spring 156, and with the downward movement of the threaded rod 180, It is moved downward while being hooked by the tip 272.

  In the above insertion operation, the insertion resistance of the upper outer race 30 into the bearing housing portion 46 and the insertion resistance of the lower outer race 32 into the bearing housing portion 48 are usually different. Due to the difference in the insertion resistance, one of the outer races 30 and 32 is inserted in advance. For example, when the insertion of the upper outer race 30 precedes, the downward movement of the threaded rod 180 is prohibited when the insertion is completed. In that case, since the movement of the insertion work execution device 104 in the vertical direction along the column 122 is allowed by the balance cylinder 178, after the downward movement of the threaded rod 180 is prohibited, the insertion operation execution device. 104 moves upward, and the lower outer race 32 is inserted. On the other hand, for example, when the lower outer race 32 is inserted in advance, after the lower outer race 32 is inserted by the upward movement of the insertion work execution device 104, the upward movement of the insertion operation execution device 104 is performed. The upper outer race 30 is inserted by the downward movement of the threaded rod 180. In this bearing insertion device 100, the relative movement in the vertical direction between the insertion operation execution device 104 and the support member 130 that fixes and supports the housing 12 is allowed in this way, so that an appropriate insertion operation is performed. .

  The state where the insertion of the two outer races 30 and 32 is completed is the state shown in FIG. When the insertion is completed, that is, when the upper outer race 30 bottoms the bearing housing portion 46 and the lower outer race 32 bottoms the bearing housing portion 48, the load of the electric motor 174 increases rapidly. The supply current to the electric motor 174 is monitored, and the bearing insertion device 100 detects a sudden increase in the supply current to the electric motor 174 and stops the rotation of the electric motor 174. The rotation of the electric motor 174 is stopped by detecting the sudden increase in the supply current, and the insertion operation is completed. In the bearing insertion device 100, the load cell 206 described above detects the upward biasing force of the nut 180, that is, the tensile force acting on the threaded rod 180. When the insertion is completed, this tensile force also increases rapidly. Therefore, in this bearing insertion device 100, even when this tensile force exceeds a predetermined value, the rotation of the electric motor 174 is stopped. An overload of the electric motor 174, an overload to the mechanical unit 172 of the insertion work execution device 104, and the like are prevented redundantly.

  In a state where the insertion operation is completed and the rotation of the electric motor 174 is stopped, the rod rotation cylinder 266 operates so as to contract, and the threaded rod 180 is rotated counterclockwise as viewed from above. As a result, the threaded rod 180 is rotated 90 ° while being raised by ¼ pitch of the ball screw formed on the threaded rod 180, and the upper holder 152 is latched by the tip 272 of the threaded rod 180, and The latch of the advance cylinder 246 by the advance cylinder holding cylinder 244 is released. When the hook of the upper holder 152 by the tip 272 of the threaded rod 180 is released, the upper holder 152 is moved upward while releasing the upper outer race 30 by the force of the compression coil spring 156.

  After the upper holder 152 is moved upward, the electric motor 174 is rotated again so that the nut 182 rotates counterclockwise as viewed from above, and the threaded rod 180 is moved downward. Thereby, the advancing cylinder 244 and the lower holder 250 move downward together with the threaded rod 180 while releasing the holding of the lower outer race 32 by the lower holder 250 by their own weight. Then, the rotation of the electric motor 174 is stopped in a state where the threaded rod 180 is positioned up to the position before the control operation is started, and the operation of the insertion work execution device 104 is finished.

  After the operation of the insertion work execution device 104 is completed, the upper holder 152 is moved to the front moving end by the front and rear cylinder devices 140 of the upper device 106, and then the upper holder 152 is moved upward by the upper and lower cylinder devices 142. It is moved to the end, whereby the control operation of the bearing insertion device 100 is completed. Waiting for the completion of the control operation, the pallet 132 is fixed to the support member 130, the housing 12 is transferred together with the pallet 132 to the carry-out conveyor device 110, and a bearing insertion operation using the bearing insertion device 110 is performed. Complete one routine.

<Function of bearing insertion device>
In this bearing insertion device 100, the lower holder 250 is the first holder and the upper holder 152 is the second holder, and the insertion work execution device 104 functions as a holder relative movement device. A structure in which the lower holder 250 and the upper holder 152 are relatively moved in the direction in which the lower outer race 32 and the upper outer race 30 held by the lower holder 250 and the upper holder 152 approach in the axial direction. Has been. Specifically, the insertion work execution device 104 is configured to move the upper holder 152 toward the lower holder 250 when an insertion operation is performed.

  More specifically, both the lower holder 250 and the upper holder 152 have through-holes that penetrate in the axial direction, and the insertion work execution device 104 has screwed rods 180 that pass through these through-holes. It is designed to perform insertion work. Further, the distal end portion 272 of the threaded rod 180 functions as a latching portion for latching the upper holder 152. When the upper holder 250 is latched by the distal end portion 272, the upper holder 152 is lowered to the lower portion. The structure moves toward the holder 250. That is, the insertion work execution device 104 functions as a rod moving device that moves the threaded rod 180, which is a rod, in the axial direction. Specifically, the electric motor 174, the nut 182, and the threaded rod 180 The rod moving device is configured including the screw portion 210 and the like.

  In addition, the insertion work execution device 104 includes a latching state switching mechanism because the threaded rod 180 is configured to switch whether or not the upper holding member 152 is latched by the tip end portion 272 of the threaded rod 180. Has been. Specifically, the tip 272 of the threaded rod 180 and the through hole 158 of the upper holder through which the threaded rod 180 passes, the structure in which the threaded rod 180 is rotatable, and the rod that is the actuator that rotates the threaded rod 180 The latching state switching mechanism includes the rotating cylinder 266 and the like.

  Furthermore, in the bearing insertion device 100, the axial movement of the insertion work execution device 104 as the holder relative movement device is allowed with respect to the support member 130 as the shaft holder support member. The bearing insertion device 100 includes a support / device relative movement allowance mechanism. Specifically, a structure in which the insertion work execution device 104 is movable up and down along the column 122 constituting the device main body 102, and a balance cylinder for supporting the insertion work execution device 104 on the base 120 of the device main body 102. The support / device relative movement permissible mechanism includes 178 and the like.

It is a front view which shows the work target object of the bearing insertion apparatus of an Example. It is side surface sectional drawing of the work target object shown in FIG. It is an exploded view in the side surface cross section of the work target object shown in FIG. It is side surface sectional drawing which shows the outline of the operation | work which the bearing insertion apparatus of a present Example performs regarding the work target shown in FIG. It is a front view which shows the bearing insertion apparatus of an Example. It is a right view which shows the bearing insertion apparatus of an Example. It is right side sectional drawing which expands and shows the principal part of the bearing insertion apparatus of an Example. It is a figure which shows the AA cross section and BB cross section in FIG. FIG. 4 is a right side cross-sectional view showing an enlarged main part of the bearing insertion device of the embodiment, and is a view showing a state in an initial stage after starting a control operation. It is a right-side sectional view showing an enlarged main part of the bearing insertion device of the embodiment, and is a diagram showing a state where the operation is performed up to a position where the insertion operation is performed. It is a right side sectional view expanding and showing an important section of a bearing insertion device of an example, and is a figure showing a state where insertion operation is started. It is right side sectional drawing which expands and shows the principal part of the bearing insertion apparatus of an Example, and is a figure which shows the state which insertion operation completed.

Explanation of symbols

10: Intermediate assembly 12: Housing (shaft holder) 14: Bevel gear (shaft body) 26: Upper angular tapered roller bearing 28: Lower angular tapered roller bearing 30: Upper outer race 32: Lower outer race 46: Bearing housing (Bearing housing European recess) 48: Bearing housing portion (Bearing housing European recess) 100: Bearing insertion device 102: Device main body 104: Insertion work execution device (holding device relative movement device, rod movement device) 106: Upper device 130 : Support member (shaft holder support tool) 152: Upper holder (second holder) 158: Through hole 170: Base 172: Mechanism part 174: Electric motor 178: Balance cylinder (support tool / device relative movement allowance mechanism) 180: Threaded rod (rod) 182: Nut 210: Threaded portion 226: Rod rotating cylinder (hanging state switching mechanism) 246 Advancing tube 250: the lower retainer (first retainer)

Claims (9)

Each of the two bearings or their outer rings, which are arranged at a distance from each other in the axial direction and receive at least a radial force between them in order to rotatably hold the shaft body in a state where it passes through it. A bearing insertion device that is fitted into each of the two bearing housing recesses provided on the shaft holder so as to face each other in the axial direction,
(A) a first holder for holding one of the two bearings or an outer ring thereof in a state of being positioned on an axis outside one of the two bearing housing recesses; and (B) the two bearings or A second holder for holding the other outer ring in a state of being positioned on the axis outside the other of the two bearing housing recesses; and (C) the first holder and the second holder. A holder relative movement device that relatively moves in the direction in which they approach in the axial direction, and by moving the first holder and the second holder relative to each other by the holder relative movement device, the two A bearing insertion device characterized in that a bearing or an outer ring of the bearing is relatively moved in an axial direction so as to approach each other, and each of them is inserted into each of the two bearing receiving recesses.   When the two bearings or the outer rings thereof are fitted into the two bearing receiving recesses, the first holder and the holder relative movement device are not relatively movable in the axial direction. The bearing insertion device according to claim 1, wherein the holder relative movement device is configured to move the second holder toward the first holder.   A shaft holder supporting tool for supporting the shaft holder, and a support / device relative movement allowing mechanism for allowing relative movement in the axial direction between the shaft holder supporting tool and the holder relative moving device. The bearing insertion device according to claim 2.   The bearing insertion device according to claim 3, wherein the shaft holder support is not movable in the axial direction, and the holder relative movement device is movable in the axial direction. Each of the first holder and the second holder has a through hole penetrating in the axial direction.
The holder relative movement device is capable of (a) penetrating both the first holder and the second holder, and the first holder of the second holder in a state of passing through both of them. A rod having a latching portion capable of latching a portion located on the opposite side; and (b) a rod moving device for moving the rod in the axial direction, wherein the latching portion is the second holding tool. The rod is moved in a direction from the second holder toward the first holder in a state of engaging the first holder, so that the first holder and the second holder are relatively moved in the direction in which they approach each other. The bearing insertion device according to any one of claims 2 to 4, wherein the bearing insertion device is structured. The rod moving device moves the rod in an axial direction between a position penetrating both the first holder and the second holder and a position not penetrating the second holder; And
The holding tool relative movement device is a hooking state in which the rod is passed through both the first holding tool and the second holding tool to switch whether the second holding tool is hooked by the hooking portion. The bearing insertion device according to claim 5, further comprising a switching mechanism. Each of the two bearings or their outer rings, which are arranged at a distance from each other in the axial direction and receive at least a radial force between them in order to rotatably hold the shaft body in a state where it passes through it. A bearing fitting method for fitting into each of two bearing housing recesses provided on the shaft holder so as to face each other in the axial direction,
Each of the two bearings or the outer ring thereof is positioned on an axis outside each of the two bearing receiving recesses;
A bearing insertion method, wherein the two bearings or the outer ring thereof are moved relative to each other in a direction in which they approach each other in the axial direction, and each of them is inserted into each of the two bearing receiving recesses.   In a state in which any one of the two bearings or the outer ring thereof, the other of them, and the shaft holder is prohibited from moving in the axial direction, the two bearings or the outer ring thereof are The bearing insertion method according to claim 7, wherein the bearings are relatively moved in a direction in which they approach in the axial direction. The bearing insertion method according to claim 8, wherein in a state in which movement of the shaft holder in the axial direction is prohibited, the two bearings or an outer ring thereof are relatively moved in a direction in which they approach each other in the axial direction.

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