JP4555147B2 - Bearing tightening device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device capable of managing exactly a fastening degree of bearings in an assembly with a structure in which a shaft is rotatably held to a shaft holding body by two angular bearings. <P>SOLUTION: A bearing fastening device 100 is equipped with a table 104 elastically supported with a displacement permitted in a state where no friction resistance is applied. The shaft holding body 12 is fixed to the table to rotate the bearing fastening member screwed together with the shaft 14 being rotated by a rotary device with which the fastening device is equipped. Then, the fastening device is structured so that relative rotation between the shaft and fastening member can be controlled so as to make a bearing fastening amount into an appropriate value, while estimating resistance due to relative rotation between the shaft and the bearing holding body by measuring displacement magnitude of a specific position 270. As no frictional force is generated for table displacement, exact relative rotational resistance can be estimated, so that the bearing fastening degree can be exactly managed. <P>COPYRIGHT: (C)2007,JPO&amp;INPIT

Description

  The present invention relates to an apparatus for tightening two rolling bearings in an axial direction in an assembly having a structure in which a shaft body is rotatably held by a shaft holding body via two rolling bearings.

  When a shaft member is rotatably held in a housing or the like, it is a common practice to use a rolling bearing capable of receiving an axial force (thrust force) such as an angular rolling bearing or a thrust rolling bearing. . When these rolling bearings are used, normally, the two rolling bearings are arranged apart from each other in the axial direction, and the two rolling bearings are tightened in the axial direction, whereby the shaft of the shaft member with respect to the housing or the like is arranged. The position in the direction will be fixed. The bearing is tightened by, for example, using a tightening member such as a nut having a female screw threadedly engaged with a male screw provided on the shaft member, and rotating the tightening member.

  In tightening the rolling bearing, it is important to manage the degree of tightening (tightening amount, tightening force, etc.). Specifically, if tightened strongly, the load on the rolling elements such as balls and rollers of the rolling bearing increases, and the resistance against rotation of the shaft member increases, so it is necessary to properly manage the degree of tightening. It becomes. For this reason, in the tightening of the rolling bearing, conventionally, the tightening operation is performed while grasping the rotational resistance of the shaft member. Specifically, in a state where the housing or the like is fixed to the rotary table, the shaft member held by the housing or the like is rotated, and the rotational force of the rotary table generated due to the rotational resistance is detected using a load cell or the like. Thus, the rotational resistance is grasped, and the tightening operation is performed in consideration of the grasped rotational resistance.

  As described above, in the conventional tightening operation, the rotational resistance of the shaft member is grasped by a method based on detection of the rotational force of the rotary table. However, a so-called rotary table is a table that is supported so that only rotation is possible, and requires, for example, a bearing or the like in the support mechanism. For this reason, there is a rotational resistance of the rotary table caused by being supported by the bearings, that is, a frictional resistance against the displacement of the rotary table. In the conventional method, even if the rotational force of the rotary table is detected, the rolling table described above is detected. It is difficult to accurately grasp the rotational resistance of the shaft member generated by tightening the bearing. Therefore, the conventional tightening work employing this method cannot sufficiently manage the degree of tightening of the bearing. The present invention has been made in view of such a situation, and in an assembly having a structure in which the shaft body is rotatably held by the shaft holding body, the two rolling bearings connecting the shaft holding body and the shaft body. An object of the present invention is to provide a bearing tightening device for tightening the shaft in the axial direction, and capable of accurately managing the tightening degree of the two rolling bearings.

In order to solve the above problems, a bearing tightening device of the present invention includes (a) a shaft body, (b) a shaft holder that holds the shaft body, and (c) a space between the shaft body and the shaft holder. Two rolling bearings arranged coaxially and spaced apart from each other and coupling the shaft body and the shaft holder so as to be relatively rotatable in a state of receiving an axial load, and (d) the shaft body And a bearing fastening member that has a screw threadedly engaged with a screw provided on one of the shaft holders and is rotated by itself so as to fasten the two rolling bearings in the axial direction. A bearing clamping device for performing clamping of the two rolling bearings with respect to an assembly,
(A) the device body;
(B) a fixing base to which the other of the shaft body and the shaft holder is fixed;
(C) Fixing provided on the apparatus main body and elastically supporting the fixing base while permitting displacement in an arbitrary direction in a plane perpendicular to the axis of the shaft body in a state not subjected to frictional resistance. A support mechanism;
(D) a first rotation device that is provided in the device body and rotates one of the shaft body and the shaft holder; and (E) a second rotation that is provided in the device body and rotates the bearing fastening member. Equipment,
(F) a fixed base displacement detection device that detects a rotational displacement amount of the fixed base around the axis of the shaft due to relative rotation between the shaft body and the shaft holder;
(G) e Bei a detection result rely processing execution apparatus for executing processing based on a detection result of the fixing base displacement amount detection device,
The fixed base support mechanism is
Each is fixed to the apparatus main body at one end and fixed to the fixing base at the other end, and is erected on the apparatus main body to support the fixing base and bend elastically in any direction. Consists of a plurality of deformable struts,
The fixed base displacement amount detection device comprises:
A plurality of set point displacement amount measuring devices each for measuring a displacement amount in each setting direction of a plurality of points set apart from each other in a plane perpendicular to the axis of the shaft of the fixed base;
A rotational displacement amount estimation unit for estimating a rotational displacement amount of the fixed base around the axis of the shaft body based on the measurement results of the plurality of set location displacement amount measuring instruments;
Characterized in that it is configured to include.

  The bearing tightening device of the present invention is configured to rotate one of the shaft body and the shaft holder so that the shaft body and the shaft holder are relatively rotated during the tightening operation of the bearing. As a support mechanism, a mechanism that elastically supports the displacement of the fixed base in a state without frictional resistance is adopted, and the rotational displacement of the fixed base due to the resistance to relative rotation between the shaft body and the shaft holder To be detected. Therefore, based on the displacement of the fixed base elastically supported as described above, it is possible to accurately grasp the resistance to relative rotation between the shaft body and the shaft holder. Therefore, according to the bearing tightening device of the present invention, it is possible to accurately manage the degree of tightening of the bearings in the tightening operation of the two rolling 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. Moreover, the aspect which deleted the component from the aspect of each term can also be one aspect of the claimable invention.

In each of the following items, the combination of the items (1) , (8), (11), and (12) corresponds to claim 1, and the technical features of item (13) in claim 1 To which the technical feature of (9) is added to claim 1 or claim 2 is added to claim 3 and to claim 3 is added the technical feature of (10). to the claim 4 those in claims 1 to 4 to one of the 4 claim 5 obtained by adding the technical features of the section to claim 5 (6) technical features of claim The addition of the technical feature of (7) to any one of claims 1 to 6 is added to claim 6, and any one of claims 1 to 4 ( The technical feature of item (14) is added to claim 8, and the technical feature of item (15) is added to any one of claims 1 to 8. There to claim 9, corresponding respectively.

(1) (a) a shaft body, (b) a shaft holding body for holding the shaft body, and (c) a coaxial body and a space between the shaft body and the shaft holding body. Two rolling bearings for coupling the shaft body and the shaft holder so as to be relatively rotatable in a state of receiving a load in an axial direction; and (d) a screw provided on one of the shaft body and the shaft holder And tightening the two rolling bearings with respect to an assembly including a bearing tightening member that tightens the two rolling bearings in the axial direction by having a screw that engages with the shaft. A bearing fastening device for performing
The device body;
A fixing base to which the other of the shaft body and the shaft holder is fixed;
A fixed base support mechanism that is provided in the apparatus main body and elastically supports the fixed base while allowing displacement in an arbitrary direction within a plane perpendicular to the axis of the shaft body in a state where it does not receive frictional resistance. When,
A first rotation device that is provided in the device main body and rotates one of the shaft body and the shaft holder;
A second rotating device that is provided in the device main body and rotates the bearing fastening member;
A fixed base displacement detection device for detecting a rotational displacement amount of the fixed base around the axis of the shaft due to relative rotation between the shaft body and the shaft holder;
A bearing tightening device comprising: a detection result-based processing execution device that executes processing based on a detection result by the fixed base displacement amount detection device.

  In the bearing tightening device according to the aspect described in this section, two rolling bearings provided for rotatably holding the shaft body on the shaft holding body in the assembly are provided on one of the shaft body and the shaft holding body. This is a device for performing an operation of tightening in the axial direction by rotating a tightening member that is screwed into a screw, and fixing the other of the shaft body and the shaft holding body, By rotating one of them, it is possible to grasp the resistance to the relative rotation between the shaft body and the shaft holder. More specifically, in the bearing tightening device of this aspect, an elastic support mechanism that allows displacement of the fixed base without frictional resistance is adopted as the support mechanism of the fixed base. When one of the holding body is rotated, the relative rotational resistance between the shaft body and the shaft holding body can be grasped by detecting the amount of displacement of the fixed base caused by the structure of the support mechanism. It is. As described above, the conventional apparatus is configured to grasp the relative rotational resistance by the rotational force of the rotary table to which the other of the shaft body and the shaft holding body is fixed. Therefore, it has been difficult to accurately grasp the relative rotational resistance due to the frictional resistance. On the other hand, in the bearing tightening device according to this aspect, the rotating table is not adopted, but the fixed base supported by the support mechanism having the above structure is adopted. Therefore, based on the amount of rotational displacement of the fixed base, more specifically, based on the amount of rotational displacement without frictional resistance, it is possible to grasp the relative rotational resistance between the shaft body and the shaft holder, It is possible to accurately grasp the relative rotational resistance. Therefore, according to the bearing tightening device of this aspect, the degree of tightening of the two bearings, more specifically, the tightening force, the tightening amount, and the like can be accurately managed. In the present specification, “to grasp the relative rotational resistance” does not only mean detecting the relative rotational resistance, but broadly interprets the relative rotational resistance, including the rotational displacement amount and the like. It also means obtaining or estimating some parameter that can be indexed or that can estimate the relative rotational resistance.

  The specific structure of the assembly to be a work target of the bearing tightening device according to the aspect of this section is not particularly limited as long as it has the above structure. For example, the “shaft body” may be anything as long as it can be rotated in the assembly. For example, a shaft member, a shaft component, or the like constituting some device may be the shaft body. Moreover, it is not only a simple shaft-shaped member, part, etc., for example, it has a shaft-shaped part, and other parts such as gears and pulleys are provided integrally or attached to the part. It may be a member, a part, or the like. The “shaft holder” may be any member, part, or the like that can rotatably hold the shaft body. Specifically, for example, a housing, casing, base, frame, housing, etc., that constitutes some device, Can be a holding body.

  The “rolling bearing” constituting the assembly only needs to receive at least an axial load (thrust load), and may be capable of receiving a radial load (radial load). . In addition, the rolling elements included in the rolling bearing may be balls, rollers, or the like. Specific examples of the “rolling bearing” that can be used in the above-described assembly are a thrust rolling bearing, an angular rolling bearing (a rolling bearing whose nominal contact angle is not 0 °), and the like. As the rolling bearing, a thrust ball bearing, a thrust tapered roller bearing, or the like can be used. As the angular rolling bearing, an angular ball bearing, an angular cylindrical roller bearing, an angular tapered roller bearing, or the like can be used. The assembly is configured to include two rolling bearings, but when these two bearings are angular rolling bearings, the two bearings are positive with one having a nominal contact angle of 0 °. It is desirable to combine the angles so that the other is a negative angle. In other words, it is desirable to combine those in which one bearing and the other bearing receive thrust loads in opposite directions.

  The “bearing tightening member” constituting the assembly may be a member that is screwed into either the shaft body or the shaft holding body. For example, when a male screw is formed on the shaft body, it may be a nut-like member having a female screw threadedly engaged with the male screw, and for example, when a female screw is formed on the shaft holder, It may be a generally ring-shaped member having a male screw that is screwed with the female screw. The bearing tightening member is a member that “tightens the two rolling bearings in the axial direction”, for example, a member that gives a force in a direction in which the distance between the two rolling bearings arranged apart from each other is reduced. Is possible. More specifically, two bearings are sandwiched between an axial support portion provided on one of the shaft body and the shaft holding body so as to face the shaft body (may be direct or via some member). It may be indirectly clamped), and can be a member that applies a force in a direction in which the two bearings approach each other to one of the two bearings. By tightening the two bearings in the axial direction by the bearing tightening member, the relative position in the axial direction between the shaft body and the shaft holding body can be fixed.

  The “apparatus main body” constituting the bearing tightening apparatus according to the aspect described in this section may include a portion that functions as a housing of the bearing tightening apparatus, such as a so-called base and frame. The “fixing base” supports the assembly, and more specifically, the other of the shaft body and the shaft holding body, that is, the shaft tightening member of the shaft body and the shaft holding body is screwed together. It is for fixing and supporting the other one. The fixed base is not limited to a trapezoid in a narrow sense. For example, it is not limited to the one that supports the other of the shaft body and the shaft holder from below, and the other of the shaft body and the shaft holder may be fixedly supported from the side or from above. is there. Further, the “fixing base” is not limited to the one that directly fixes the other of the shaft body and the shaft holding body. For example, in the state where the other of the shaft body and the shaft holding body is fixedly held by a holding member such as a pallet, the other of the shaft body and the shaft holding body is fixedly supported by fixing and supporting the holding member. There may be. That is, the fixing base may indirectly support and support the other of the shaft body and the shaft holding body via some member, part, or the like.

  “Fixed base support mechanism” that supports the fixed base allows at least displacement in an arbitrary direction along a plane perpendicular to the axis of the shaft body of the fixed base in a state where the assembly is supported by the fixed base. That is, displacement in any direction along the plane is allowed. The fixed base support mechanism may be any mechanism that allows displacement in any direction along at least a plane perpendicular to the axis of the shaft of the fixed base, and also allows displacement in a direction crossing the plane. It may be a thing. Further, the fixed base support mechanism allows the displacement of the fixed base in a state where it does not receive frictional resistance. For example, the fixed base support mechanism is in sliding contact with any part, member, etc., or engaged with them via some rolling element. What is necessary is just to set it as the structure which supports a fixed stand in the state which is not the state where the control with respect to a displacement exists. Furthermore, the fixed base support mechanism supports the fixed base "elastically". For example, when some force is applied to the other of the shaft body and the shaft holding body, the fixed base support mechanism depends on the magnitude of the force. What is necessary is just to make it the structure which supports a fixed base so that it may be displaced.

  The “first rotating device” constituting the bearing fastening device described in this section rotates one of the shaft body and the shaft holding body with respect to the other of the shaft body and the shaft holding body fixed to the fixed base. In other words, it can be considered as a device that relatively rotates the shaft body and the shaft holding body. In addition, the “second rotating device” rotates the bearing fastening member that is screwed into one of the shaft body and the shaft holding body that can be rotated by the first rotating device. Therefore, in the bearing tightening device described in this section, the first rotating device and the second rotating device relatively rotate one of the shaft body and the shaft holding member and the bearing tightening member to It can be thought of as a device that performs tightening. The specific configuration of the first rotating device and the second rotating device is not particularly limited. For example, the first rotating device includes a rotation drive source such as a motor, a shaft body and a shaft holding member in a rotatable state. A rotation engagement body that engages with one of the bodies, and a rotation transmission mechanism (such as a speed reduction mechanism including a gear, a belt, and the like) provided between the rotation drive source and the rotation engagement body. Similarly, the second rotation device includes a rotation drive source, a rotation engagement body that engages with the bearing tightening member, and a rotation transmission mechanism. Can be. The first rotating device and the second rotating device preferably have a structure in which the rotation speed, the rotating torque, and the like are variable. The bearing tightening device can rotate the first rotating device and the second rotating device. It is desirable to provide a control device for changing speed, rotational torque, and the like.

  The "fixing base displacement detection device" that constitutes the bearing tightening device described in this section is a device that detects the amount of displacement of the fixing base that is elastically supported by the fixing base support mechanism. This is a device for detecting the amount of rotational displacement around the axis of the shaft body in a state where the assembly is supported on the fixed base. Although the specific configuration is not particularly limited, since the fixed base is allowed to be displaced in an arbitrary direction within a plane perpendicular to the axis by the fixed base support mechanism, for example, as described later, A measuring instrument that measures the amount of displacement in a specific direction of a specific part of the fixed base, and a means (for example, a computer) that estimates the rotational displacement amount by arithmetic processing or the like based on a measurement result by the measuring instrument. It is possible. Further, for example, it may be configured to include an imaging device that images the fixed base or a part thereof, and a means (for example, an image processing computer) that detects the rotational displacement based on an image obtained by the device. Is possible.

  The “detection result-based processing execution device” constituting the bearing tightening device described in this section is a device that executes some processing based on the rotational displacement amount of the fixed base detected by the fixed base displacement amount detection device. It is. Specifically, for example, estimation of resistance to relative rotation between the shaft body and the shaft holder, estimation of bearing tightening force by the bearing tightening member, control of operations of the first rotating device and the second rotating device, etc. An apparatus that performs one or more of various processes can be provided. The detection result-based process execution device can be configured in various appropriate modes according to the processing content, but can be, for example, a computer-based device.

  (2) The bearing tightening device is a device for performing tightening of the two angular rolling bearings on the assembly in which each of the two rolling bearings is an angular rolling bearing. The bearing fastening device described in 1.

  The aspect described in this section is an aspect in which the two rolling bearings constituting the assembly are limited to the angular rolling bearings. When tightening two rolling bearings in the axial direction, in the case of angular rolling bearings, compared to the case of thrust rolling bearings. The difference in relative rotational resistance between the shaft body and the shaft holding body due to the difference in the tightening degree is small. Therefore, when the tightening degree is managed for the assembly configured to include the angular rolling bearing, it is necessary to grasp the relative rotational resistance more accurately. Therefore, according to the aspect of this section, it is possible to accurately manage the tightening degree of the assembly including the angular rolling bearing.

  (3) The assembly includes an outer race approach prohibiting portion in the shaft holder for prohibiting the outer race from approaching each of the two angular rolling bearings, and the bearing tightening member is a male screw provided on the shaft body. The bearing tightening device according to (2), wherein the bearing tightening device is a nut member that has a female screw threadedly engaged with the inner race of the two angular rolling bearings with a part of the shaft body.

  The aspect described in this section is an aspect in which the configuration of the assembly that employs the angular rolling shaft is more specifically limited. If the angular rolling bearing is tightened in the axial direction in the assembly configured as described above, it is easy to fix the relative position in the axial direction between the shaft body and the shaft holder while holding the shaft body rotatably on the shaft holder. Can be done.

(4) The bearing tightening device is
By operating the first rotating device and the second rotating device at the same time, one of the shaft body and the shaft holding body and the bearing fastening member are rotated relative to each other, and the two rotations are caused by the relative rotation. The bearing tightening device according to any one of (1) to (3), wherein the bearing is configured to be tightened.

  In the bearing tightening device, in a state where one rotation of the shaft body and the shaft holding body by the first rotating device is prohibited, the second rotating device rotates the bearing tightening member to tighten the two bearings, In a state where the rotating device does not exert any action on the bearing fastening member, one of the shaft body shaft holder and the shaft body shaft holder is rotated by the first rotating device by the first rotating device. It can also be set as the aspect which grasps | ascertains the resistance with respect to relative rotation. According to the aspect described in this section, unlike the aspect, the first rotating device and the second rotating device are operated at the same time, and the shaft body and the shaft holding body are relatively rotated to perform the tightening operation. It is possible to grasp the resistance to the relative rotation while tightening the bearing.

(5) The bearing tightening device is
One of the shaft body and the shaft holder is rotated at a constant speed by the first rotating device, and the two rotating bearings are tightened by changing the rotational speed of the bearing tightening member by the second rotating device. The bearing tightening device according to item (4), which is configured as described above.

  According to the aspect described in this section, it is possible to change the tightening speed of the bearing while maintaining the relative rotational speed of the shaft body and the shaft holding body constant. Therefore, it is possible to easily adjust the degree of tightening of the bearing while more accurately grasping the resistance to the relative rotation between the shaft body and the shaft holder.

  (6) The detection result dependence processing execution device controls the operation of at least one of the first rotating device and the second rotating device based on a detection result by the fixed base displacement amount detector, and the shaft The bearing tightening device according to item (4) or (5), further including a rotating device control unit that controls a relative rotational speed between one of the body and the shaft holder and the bearing tightening member.

  The mode described in this section is a mode in which the detection result-based processing execution device executes control of the tightening speed of the bearing as processing based on the rotational displacement amount around the axis of the shaft of the fixed base. Based on the amount of rotational displacement, it is possible to grasp the resistance to relative rotation between the shaft body and the shaft holder, and according to the aspect of this section, the tightening speed can be controlled under the grasp of the resistance. Thus, it is possible to accurately manage the degree of tightening while performing the tightening of the bearing. Specifically, in the aspect described in this section, when the rotational displacement amount becomes the set displacement amount, that is, when the grasped degree of tightening approaches the target tightening degree. The mode of controlling the operation of at least one of the first rotating device and the second rotating device so that the relative rotational speed of one of the shaft body and the shaft holding body and the bearing tightening member, that is, the tightening speed is decreased. Is included. Further, in the aspect of this section, the control of the relative rotational speed includes control such that the rotational speed becomes 0. In the aspect of this section, the rotational displacement amount is a set displacement amount. In other words, when the grasped degree of tightening becomes the target degree of tightening, the relative rotational speed of one of the shaft body and the shaft holder and the bearing tightening member is set to zero. That is, a mode is included in which the operation of at least one of the first rotating device and the second rotating device is controlled so as to stop or end the tightening. As described later, in the aspect described in this section, the relative rotational resistance between the shaft body and the shaft holder is estimated based on the rotational displacement amount, and the first rotating device and the first rotation speed are determined based on the estimation result. A mode of controlling at least one operation with the two-rotation device is also included.

  (7) The detection result dependence processing execution device includes a relative rotation resistance estimation unit that estimates resistance to relative rotation between the shaft body and the shaft holder based on a detection result by the fixed base displacement amount detection device. The bearing tightening device according to any one of items (1) to (6).

  The mode described in this section is a mode in which the detection result-based process execution device estimates the resistance to relative rotation between the shaft body and the shaft holding body as a process based on the rotational displacement amount around the axis of the shaft body of the fixed base. is there. Speaking flatly, the mode of this section is a mode in which the relative rotational resistance is directly grasped by estimating the relative rotational resistance between the shaft body and the shaft holding body. The aspect of this section can also be an aspect in which the relative rotational resistance is estimated, and based on the estimated relative rotational resistance, the above-described control for decreasing the tightening speed and the control for stopping or terminating the tightening are performed. is there.

(8) The fixed base displacement amount detection device includes:
A plurality of set point displacement amount measuring devices each for measuring a displacement amount in each setting direction of a plurality of points set apart from each other in a plane perpendicular to the axis of the shaft of the fixed base;
A rotational displacement amount estimation unit configured to estimate a rotational displacement amount around the axis of the shaft body of the fixed base based on the measurement results of the plurality of set location displacement amount measuring instruments; (7) The bearing clamping device according to any one of (7).

  As described above, since the fixed base is allowed to be displaced in any direction within a plane perpendicular to the axis of the shaft body by the fixed base support mechanism, that is, the fixed base is allowed to be displaced in any direction. Therefore, it is difficult to estimate a sufficiently accurate rotational displacement amount when the rotational displacement amount around the axis is detected based on the displacement amount at a specific location of the fixed base. According to the aspect described in this section, the rotational displacement amount is estimated on the basis of the displacement amount in each specific direction at a plurality of locations on the fixed base, so that a sufficiently accurate rotational displacement amount can be detected. Note that the estimation of the rotational displacement amount based on the displacement amounts of a plurality of locations can be performed according to a geometric technique based on the positional relationship between the locations, the displacement direction and the displacement amount of each location. Further, the “set point displacement measuring device” may be configured to include an appropriate sensor, a displacement meter, etc. If possible, it may be configured to include a sensor, a displacement meter, etc. having a structure that hardly applies force to the fixed base. It is desirable. Specifically, for example, a potentiometer, a photoconductive element displacement meter, an eddy current displacement sensor, a differential transformer, a capacitance displacement meter, a hole blocking displacement sensor, a semiconductor magnetoresistive element displacement sensor, an inductor, a magnescale, It is possible to employ one that includes an electric micrometer, a linear encoder, or the like.

(9) The fixed base displacement amount detection device includes:
As the plurality of set location displacement amount measuring devices, each is a displacement amount of each of two locations sandwiching the axis on a straight line passing through the axis of the shaft body, and a displacement amount in a direction orthogonal to the straight line. The bearing tightening device according to the item (8), which includes two measuring devices for measuring the amount of displacement at a set point to be measured.

  The aspect described in this section is an aspect in which the rotational displacement amount is estimated based on the displacement amounts in the same specific direction at the two specific locations. According to the aspect described in this section, since the rotational displacement amount can be estimated based on the displacement amount of a small portion, simple estimation is possible.

(10) The two set location displacement amount measuring instruments measure the displacement amounts of the two locations whose distances from the axis of the shaft body are equal to each other,
The rotational displacement amount estimation unit calculates a rotational displacement amount around the axis of the shaft body of the fixed base based on a sum of displacement amounts of the two locations measured by the two set location displacement amount measuring instruments. The bearing tightening device according to item (9), which is to be estimated.

  The two specific locations in the aspect of this section are two locations that are the same distance away from the axis with the axis interposed therebetween. Therefore, according to the aspect described in this section, it is possible to estimate the rotational displacement amount more easily as easily understood from a geometrical viewpoint. Further, as will be described in detail later, the displacement of the fixed base caused by the relative rotational resistance between the shaft body and the shaft holding body is accompanied by the movement of the fixed base in any direction other than the rotational displacement about the axis. Even when displacement is included, the rotational displacement amount can be easily estimated. When the fixed base is accompanied by an accurate rotational displacement around the axis, the displacement in one direction perpendicular to the axis is a positive value at one measurement point, and a negative value at the other measurement point. Become. In such a case, the “sum of displacement amounts” referred to in this section means the sum of absolute values of the displacement amounts.

(11) The fixed base support mechanism is
Any one of the items (1) to (10), each including a plurality of support members that are fixed to the apparatus main body at one end and fixed to the fixing base at the other end and are elastically deformable. Crab bearing tightening device.

  If the fixed base is supported by the elastically deformable support member as in the aspect described in this section, a structure that allows the displacement of the fixed base without frictional resistance can be easily realized.

(12) The fixed base support mechanism is
As the plurality of support members, each includes a plurality of support columns that are erected on the apparatus main body to support the fixed base and can be elastically bent and deformed in an arbitrary direction. The bearing fastening device described.

  The aspect described in this section is an aspect in which the fixed base support mechanism is configured such that a plurality of elastically bending support columns are employed as the elastically deformable support members, and the support table is supported by the support columns. If a support member in the form of a column is used, the weight of the fixed base and the assembly fixed to it will be firmly supported, and the amount of displacement of the fixed base will be allowed according to the relative rotational resistance between the shaft body and the shaft holder. It is possible to do it easily.

  (13) The bearing tightening device according to (12), wherein the first rotating device and the second rotating device are disposed between the fixed base and the device main body.

  When the above-mentioned support is used for the fixed base support mechanism, a relatively large space can be present between the fixed base and the apparatus main body. The mode described in this section is a mode in which the first rotating device and the second rotating device are disposed in this space. According to the mode described in this section, the configuration of the device is arranged above the fixed base. It is possible to realize a bearing fastening device having a structure in which no element is present. According to such a bearing tightening device, workability such as placing the assembly on the fixed base and detaching from the fixed base is improved.

  (14) The bearing tightening device according to any one of (1) to (13), wherein the bearing tightening device includes a fixed base displacement prohibiting mechanism that prohibits displacement of the fixed base.

  When a fixed base support mechanism that elastically supports the fixed base is employed, the fixed base is easily displaced even when it is not caused by one rotation of the shaft body and the shaft holder by the first rotating body. For example, when the assembly is supported on or removed from the fixed table, the fixed table is displaced even when external force is applied to the fixed table. There is a possibility that workability such as The aspect described in this section considers such a possibility. According to the aspect of this section, for example, it is possible to arbitrarily fix the fixing base, and the assembly can be attached to and detached from the fixing base. It is possible to improve the workability of such work. The “fixed base displacement prohibiting mechanism” is not particularly limited in its specific structure. For example, the “fixed base displacement prohibiting mechanism” has a structure in which the fixed base is locked to the apparatus main body by an arbitrary operation or command. Can be adopted.

  (15) The bearing tightening device according to any one of (1) to (14), wherein the bearing tightening device includes a fixed base displacement range restriction mechanism for restricting a range in which the displacement of the fixed base is allowed. apparatus.

  When a fixed base support mechanism that elastically supports the fixed base is adopted, the other of the shaft body and the shaft holder is fixed to the fixed base, and one of the shaft body and the shaft holder is rotated by the first rotating device. In this case, the displacement amount fixing base corresponding to the relative rotational resistance between the shaft body and the shaft holder is displaced. In that case, for example, when the relative rotational resistance is large, the fixed base is excessively displaced. This excessive displacement may cause various problems such as deterioration of the measurement accuracy of the displacement amount and plastic deformation of members constituting the fixed base support mechanism. The aspect described in this section considers such a possibility, and according to the aspect of this section, excessive displacement of the fixing base is prohibited, and the various types described above that are caused by excessive displacement of the fixing base. It is possible to prevent problems from occurring. Note that the specific structure of the “fixed base displacement range restriction mechanism” is not particularly limited. For example, when the fixed base has a set amount of displacement, the displacement of the fixed base beyond that is fixed. It is possible to adopt a stopper-like structure for prohibiting.

  Hereinafter, one example and a modification 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.

<Workpieces targeted by the bearing tightening device>
The workpiece | work which the bearing clamping device of an Example makes work object 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 workpiece 10 is an assembly including a housing 12 as a shaft holder and a bevel gear 14 (also referred to as “pinion”) as a shaft body rotatably held in the housing 12. This constitutes a part of the vehicle final reduction gear. The housing 12 is provided with a differential case (not shown) including a differential case and a differential small gear and a differential large gear disposed therein, and the bevel gear 14 is connected to the terminal gear 14. It functions as a reduction small gear as an input gear in the reduction gear, 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 held by outer races 30 and 32, inner races 34 and 36, and retainers 38 and 40, respectively, and the outer races 30 and 32 and the inner races 34 and 36, respectively. And a plurality of tapered rollers 42 and 44 as rolling elements interposed between the outer races 32 and 33. Each of the outer races 32 and 33 is a component of the holding hole 16 provided in the housing 12. The large-diameter portion 50 and the small-diameter portion 52 of the shaft portion 18 of the bevel gear 14 are fitted in the inner races 34 and 36, respectively. A portion where the inner diameter between the fitting hole portion 46 and the fitting hole portion 48 is reduced (hereinafter sometimes referred to as “access prohibition portion 54”) is the outer race 30, 30 of each of the angular bearings 26, 28. The outer races 30 and 32 are prohibited from mutual approach.

  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. (Washer 56 can also be considered part of bevel gear 14). 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 figure, and a tightening nut 62 (hexagonal nut) as a bearing tightening member is screwed into the male screw portion 60. It has been. That is, the inner races 34 and 36 are sandwiched between the gear portion 20 and the tightening nut 62 with the 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.

  As described above, by tightening the two angular bearings 26 and 28, the inner races 34 and 36 receive a force in a direction approaching each other. On the other hand, the outer races 30 and 32 of the two angular bearings 26 and 28 are prohibited from approaching each other by the approach prohibition portion 54 provided in the shaft holding hole 16. Therefore, a load is applied to each of the tapered rollers 42 and 44 of each of the two angular bearings 26 and 28. Each of the tapered rollers 42 and 44 is in angular contact with each of the outer races 30 and 32 and each of the inner races 34 and 36 (because the nominal contact angle is not 0 °). The resistance against the relative rotation between each of the 32 and each of the inner races 34, 36, that is, the rotational resistance with respect to the housing 12 of the bevel gear 14. The load varies depending on the degree of tightening of the two angular bearings 26 and 28, and the larger the tightening amount, that is, the larger the tightening amount, the greater the degree of tightening. Become. Therefore, it is important to manage the degree of tightening of the two angular bearings 26 and 28. In the bearing tightening device of the present embodiment described below, the tightening operation should be performed while grasping the degree of tightening. Has been.

<Configuration of bearing tightening device>
An overall perspective view of the bearing tightening device of the embodiment is shown in FIG. 4, and an exploded perspective view is shown in FIG. The bearing tightening device 100 includes a device frame 102 that constitutes a device main body, a table unit 106 that includes a table 104 to which the workpiece 10 is fixed, and the bevel gear 14 and the fastening gear 14 that are in the state in which the workpiece 10 is fixed. A rotating device unit 112 having a bevel gear rotating device 108 and a tightening nut rotating device 110 for rotating each of the attached nuts 62, and a control device fixed on the device frame 102 to control the bearing fastening device 100. And a built-in control panel 114. In the following description, the diagonally lower left in FIGS. 4 and 5 is referred to as the front side (front) of the apparatus, the diagonally upper right is referred to as the rear side (rear) of the apparatus, and the diagonally upper left is referred to as the left side (leftward) of the apparatus. ) And the diagonally lower right are referred to as the right side (right side) of the apparatus.

  The apparatus frame 102 includes a base frame 120, a standing support plate 122 that is erected at the center of the base frame 120 before and after, and an angle frame 124 that is provided so as to surround the front side of the standing support plate 122. It is configured to include. As shown in FIG. 6, a pair of guide rails 126 extending in the vertical direction are fixed to the standing support plate 122, and two slides are provided for each of the pair of guide rails 126. A block 128 is slidably disposed. The elevating cylinder 130 is fixed to the standing support plate 122. As will be described in detail later, the rotating device unit 112 is attached to the slide block 128 and moved up and down by a lift cylinder 130 that is hydraulically driven.

  As shown in FIG. 7, the table unit 106 includes a table 104 as a fixed base to which the workpiece 10 is fixed, a base plate 140 fixed to the base frame 120 that constitutes the apparatus frame 102, and the base plate 140. The four support rods 142 are provided so as to stand and support the table 104. Each support rod 142 functions as a support member for supporting the table 104, specifically, as a support column. The lower end portion is fixed to the apparatus frame 102 via the base plate 140, and the upper end portion is the table. It is fixed to the lower surface of 104. Each support rod 142 is relatively thin and can sufficiently support the weight of the table 104 and the workpiece 10 placed on the support rod 142. Are easily elastically deformable, and more specifically, can be elastically bent and deformed in an arbitrary direction. In the present bearing tightening device 100, a fixed base support mechanism for supporting the table 104 as a fixed base is configured including the support rods 142.

  As shown in FIG. 8, the workpiece 10 is fixed to the pallet 144 and fixed to the table 104 in a state of being fixed to the pallet 144 as shown in FIG. 9. The pallet 144 is generally L-shaped in cross section having a bottom plate portion 146 and a back plate portion 148. The workpiece 10 is placed on the bottom plate portion 146, and the bottom portion of the housing 12 is a fixture that is not shown. Fixed by. Although not shown in the drawing, the bottom plate portion 146 is provided with an opening, and a serration portion 22 that is a lower end portion of the bevel gear 14 included in the work 10 protrudes downward from the opening.

  The table 104 includes a base plate 150 and a pair of upright plates 154 and 156 that are provided up and down on the base plate 150 and have four rollers 152 attached to the respective opposing surfaces. The workpiece 10 fixed to the pallet 144 is moved in a state where the pallet 144 rides on the rollers 152 and is carried in from the right side of the bearing tightening device 100. Although not shown in the figure, the table 104 is provided with a stopper that can be unlocked, and the pallet 144 is locked to the stopper that is in the lockable state, so that the loaded workpiece 10 is moved in the left-right direction. Positioning is performed. In a state in which the positioning in the left-right direction is performed, a wedge-shaped fixture (not shown) is inserted between the front end of the bottom plate portion 146 of the pallet 144 and the front-side standing plate 154, so that the rear of the pallet 144 The end is pressed against the upright plate 156, the workpiece 10 is positioned in the front-rear direction, and the pallet 144 is firmly fixed to the table 104. The work 10 is placed on the table 104 as described above.

  As shown in FIG. 6, the angle frame 124 is provided with a pair of fixing pins 162 in a state of being supported by each of the pair of brackets 160, and each of the fixing pins 162 is advanced and retracted in the vertical direction. A pair of fixed pin advance / retreat cylinders 164 (driven by compressed air) are provided. Each of the fixing pins 162 is fitted into each of two pin holes 168 provided in the front end portion of the base plate 150 of the table 104 in a state where the fixing pins 162 are advanced upward by the respective cylinders 164. . The fixing pin 162 and the pin hole 168 have almost no clearance, and in the state where each of the two fixing pins 162 is fitted into each of the two pin holes 168, the table 104 is displaced in the front / rear and left / right directions. It will be in a prohibited state. When the work 10 is carried in and the pallet 144 is fixed, the fixing pins 162 are advanced by the cylinders 164 to be fitted into the pin holes 168, and the displacement of the table 104 is prohibited. It is possible to perform these operations. That is, a fixed base displacement prohibiting mechanism that includes a fixed pin 162, a fixed pin advancing cylinder 164, a pin hole 168, and the like to prohibit the displacement of the table 104 as a fixed base is configured. The mechanism facilitates the carrying-in operation and the fixing operation.

  The workpiece 10 positioned and fixed as described above is in the state shown in FIG. 9, and in this state, the axis of the bevel gear 14 included in the workpiece 10 is orthogonal to the base plate 150 of the table 104 and is provided on the base plate 150. It is in a state of being fixed with respect to the bearing tightening device 100 so as to coincide with the center line of the round opening 170. In the fixed state, the rotating device unit 112 is engaged with the workpiece 10 using the opening 170, and the bevel gear 14 and the tightening nut 62 are rotated as described later.

  A rotating device unit 112 having a cross section shown in FIG. 10 and FIG. 11 includes a base 180, a bevel gear rotating device 108 supported by the base 180, and a tightening nut rotating device 110. In other words, the rotating device unit 112 includes a base 180, a first motor 182 and a second motor 184 supported by the base 180, and a first motor 182 and a second motor supported by the base 180. And a drive mechanism unit 186 driven by 184. The base 180 includes a back plate 190, a first support plate 192 having a generally L shape fixed to the back plate 190, and a second support plate 194 formed integrally with the back plate 190. In the first support plate portion 192, the first motor 182 is fixedly supported on the base 180, and in the second support plate portion 194, the second motor 184 and the drive mechanism portion 186 are attached to the base 180. Fixedly supported.

  The drive mechanism unit 186 includes a first holding cylinder 202 fixed to the second support plate part 192 via the holding ring 200 and a second holding cylinder 204 fixed to the second support plate part 192. . The first holding cylinder 202 and the second holding cylinder 204 are fixed to the second support plate 192 at their flanges 206 and 208, respectively, and the upper part of the cylinder part 210 of the first holding cylinder 202 is the second. In a state of being accommodated in the cylinder portion 212 of the holding cylinder 204, they are arranged coaxially with each other. Inside the cylinder part 210 of the first holding cylinder 202, the first rotating cylinder 216 is held rotatably and immovably in the axial direction via a bearing 214, and inside the cylinder part 212 of the second holding cylinder 204 The second rotary cylinder 220 is held via a bearing 218 so as to be rotatable and immovable in the axial direction. Incidentally, the second rotating cylinder 220 is disposed so as to accommodate the upper portion of the cylinder portion 210 of the first holding cylinder 202.

  An engagement rod 222 is inserted into the first rotary cylinder 216. As will be described later, the engagement rod 222 is engaged with the serration portion 22 of the bevel gear 14 included in the workpiece 10 at the upper end portion, and is engaged with the first rotating cylinder 216 by a spline. The rotation cylinder 216 is not rotatable and can move in the axial direction. An engaging cylinder 224 is inserted into the upper part of the second rotating cylinder 220. As will be described later, the engaging cylinder 224 is engaged with a tightening nut 62 included in the workpiece 10 at the upper end portion, and is engaged with the second rotating cylinder 220 by a spline. It cannot rotate with respect to 220 and is movable in the axial direction. Incidentally, the engaging rod 222 is disposed in a state where the upper portion of the engaging rod 222 is accommodated in the engaging cylinder 224.

  A support protrusion 226 that protrudes in an annular shape is provided on the outer periphery near the upper end of the engagement rod 222, and both ends are supported by the support protrusion 226 and the upper end surface of the first rotating cylinder 216. In addition, a compression coil spring 228 is disposed so as to be fitted on the engagement rod 222. A locking ring 230 is fixed to the lower end portion of the engaging rod 222, and the upward movement of the engaging rod 222 is restricted by the locking ring 230 and is biased upward by the spring 228. It is in a state. With such a configuration, when the force exceeding the urging force of the spring 228 is applied, the downward movement of the engagement rod 222 is allowed.

  The engagement cylinder 224 has a flange portion 232, and four port holes are formed in the flange portion 232 at equal positions on one circumference. The four bolts 234 are erected on the inner peripheral side base of the flange portion 236 of the second rotating cylinder 220 by being screwed into the bolt holes (in the figure, only one bolt 234 is shown). It is shown). Four compression coil springs 238 are disposed between the flange portion 232 of the engagement cylinder 224 and the flange portion 236 of the second rotary cylinder 220 so as to be fitted around the four bolts 234, respectively. Yes. The engagement cylinder 224 is restricted in its upward movement by the head of the bolt 234 and is urged upward by the spring 238. With such a configuration, when a force exceeding the urging force of the spring 238 is applied, the downward movement of the engagement cylinder 224 is permitted. Note that thin cylindrical members 240 and 242 fitted to each other are fixed to the flange portion 232 of the engaging cylinder 224 and the flange portion 236 of the second rotating cylinder 220, respectively. In addition, it functions as a dust-proof cover that ensures dust-proofing of the drive mechanism 186 while allowing the engagement cylinder 224 to move up and down.

  A gear 244 is fitted to the lower portion of the first rotating cylinder 216 so as not to rotate relative to the first rotating cylinder 216, and this gear 244 is fitted to the motor shaft of the first motor 182 so as not to rotate relative thereto. It is meshed with the gear 246. Further, teeth are formed on the outer periphery of the flange portion 236 included in the second rotating cylinder 220, and the flange portion 236 functions as a gear. The outer periphery of the flange portion 236 is the second motor 184. A gear 248 fitted to the motor shaft so as not to rotate relative thereto is engaged with the motor shaft. With such a structure, each of the engagement rod 222 and the engagement cylinder 4 can be independently rotated by rotating each of the first motor 182 and the second motor 184. The first motor 182 and the second motor 184 are both servomotors with a speed reducer, and the rotation speed can be controlled. The rotation speeds of the engagement rod 222 and the engagement cylinder 224 are independent. Can be controlled.

  A concave portion that is recessed in the axial direction is provided at the upper end portion of the engagement rod 222, and a serration 250 that engages with the serration portion 22 of the bevel gear 14 included in the workpiece 10 is provided inside the concave portion. ing. Further, the upper end portion of the engagement cylinder 224 functions as a so-called box wrench, and is provided with a generally hexagonal engagement hole 252 that engages with the tightening nut 62 provided in the workpiece 10. As described above, if the housing 12 of the workpiece 10 is fixed to the table 104 and the first motor 182 is rotated in a state where the engagement rod 222 and the serration portion 22 of the bevel gear 14 are engaged, the bevel gear 14 is rotated. If the second motor 184 is rotated in a state where the engagement cylinder 224 and the tightening nut 62 are engaged, the tightening nut 62 can be rotated. More specifically, by controlling the relative rotational speed between the first motor 182 and the second motor 184, relative rotation between the tightening nut 62 and the bevel gear 14 is caused, and the two angular bearings 26 provided in the workpiece 10 are provided. , 28 can be tightened.

  Due to the above structure, the rotation device unit 112 includes the first motor 182, the first holding cylinder 202, the first rotation cylinder 216, the engagement rod 222, the gear 224, the gear 226, and the like for the first rotation. A bevel gear rotating device 108 which is a device is configured, and includes a second motor 184, a second holding tube 204, a second rotating tube 220, an engaging tube 224, a gear 248 and the like, and a tightening nut which is a second rotating device. The rotating device 110 is configured.

  As described above, in the bearing tightening device 100, the rotating device unit 112 includes four slide blocks that are movable along the two guide rails 126 provided on the standing support plate 122 of the device frame 102. 128 is attached. More specifically, it is attached to the slide block 128 on the rear surface of the back plate 190 of the base 180 constituting the rotating device unit 112. The lifting cylinder 130 described above is configured such that the upper end portion of the cylinder rod of the lifting cylinder 130 supports the central portion of the lower end of the back plate 190 in the left-right direction from below, and the rotating device is operated by operating the lifting cylinder 130. The unit 112 is lifted and lowered. As described above, when the workpiece 10 is carried in and fixed to the table 104, the rotating device unit 112 is positioned at the lowered position, and after the workpiece 10 is fixed to the table 104, the lifting cylinder 130 is operated. Thus, the rotating device unit 112 is positioned at the raised position, and in this state, the angular bearings 26 and 28 are tightened. When the rotation device unit 112 is raised, the serration 250 provided on the engagement rod 222 and the serration portion of the bevel gear 14 due to a mismatch between the rotation angle of the engagement rod 222 and the rotation angle of the bevel gear 14. When the engagement rod 222 is not fitted, the engagement rod 222 is pushed down against the urging force of the compression coil spring 228, but when the engagement rod 222 is rotated by the bevel gear rotation device 108. The rotation angle of the engagement rod 222 and the rotation angle of the bevel gear 14 are matched, and the engagement rod 222 is pushed up by the urging force of the spring 228 so that the serration 250 and the serration portion 22 are engaged. Similarly, the engagement hole 252 provided in the engagement cylinder 224 and the outer portion of the tightening nut 62 do not fit due to mismatch between the rotation angle of the engagement cylinder 224 and the rotation angle of the tightening nut 62. In this case, the engagement cylinder 224 is pushed down against the urging force of the compression coil spring 238. However, when the engagement cylinder 224 is rotated by the tightening nut rotating device 110, the engagement cylinder 224 is rotated. And the rotation angle of the tightening nut 62 are aligned, and the engagement cylinder 224 is pushed up by the urging force of the spring 238 so that the engagement hole 252 and the outer portion of the tightening nut 62 are engaged. . After completion of the tightening operation of the angular bearings 26 and 28, the rotating device unit 112 is brought into the lowered position by the operation of the elevating cylinder 130. In this state, the workpiece 10 is released from being fixed to the table 104. Is carried out.

  The above is the description of the configuration of the bearing tightening device 100. As a feature of the configuration of the bearing tightening device 100, the rotating device unit 112 is more specifically, the bevel gear rotating device 108 and the tightening nut rotation. It can be mentioned that both the apparatus 110 and the apparatus 110 are disposed between the table 104 and the apparatus frame 102 (strictly, between the table 104 and the base frame 120). This feature is realized by the table 104 being supported by four support rods 142 each functioning as a support column. Specifically, it is realized by existing in the space between the two support rods 142 on the near side and the two support rods 142 on the back side (each of the two support rods 142 on the back side is a rotating device. Each of the two openings 260 provided in the base body of the unit 112 (see FIG. 10, only one of them is shown in the figure)). As described above, since the rotating device unit 112 exists below the table 104, the bearing fastening device 100 has a structure in which no component of the device exists in the space above the table 104. Yes. Therefore, workability of work such as loading of the workpiece 10, placing of the table 104, and unloading is good.

<Management of angular bearing tightening degree>
As described above, when the angular bearings 26 and 28 of the workpiece 10 are tightened by the tightening nut 62, the rotational resistance of the bevel gear 14 changes depending on the tightening degree. In the bearing tightening device 100, the tightening degree is managed.

  The workpiece 10 is placed on the table 104 by fixing the housing 12 to the table 104 via the pallet 144. In this state, if the bevel gear rotating device 108 is operated to rotate the bevel gear 14, as shown in FIG. 12, a magnitude force corresponding to the rotational resistance of the bevel gear 14 with respect to the housing 12, that is, the bevel gear 14. Rotational torque Tq around the axis Q, which is the axis of A, acts on the table 104. In the present bearing clamping device 100, as described above, the table 104 is elastically supported by the device frame 102 by the four support rods 142, and the four support rods 142 are caused by the force depending on the rotational resistance. The bending deformation (deflection) table 104 is displaced. As will be described in detail later, in the present bearing tightening device 100, the bevel gear 14 is rotated clockwise as viewed from above by the bevel gear rotating device 108, so that the table is rotationally displaced in that direction.

The displacement of the table 104 generally appears as a rotational displacement around the axis Q, as exaggerated in FIG. In the present bearing tightening device 10, in order to measure this rotational displacement, a pair of measured bars 270 are provided on the table 104, and set points P _R and P _L set in each of the measured bars 270. A pair of differential transformers 272 is provided as a set point displacement amount measuring device for measuring the amount of displacement. Specifically, each of the bars to be measured 270 is attached to the lower surface of the base plate 150 of the table 104 so as to extend to the left and right from the base plate 150 (see FIG. 7). The inner surface of each of the bars 270 to be measured where the setting points P _R and P _L exist is located on one surface including the axis Q, and the setting points P _R and P _L are on a straight line orthogonal to the axis Q. And distances from the axis Q are equal to each other. On the other hand, each of the differential transformers 272 is disposed on each of a pair of brackets 274 attached to the standing support plate 122 constituting the device frame 102 in a direction extending in a direction perpendicular to the straight line ( (See FIG. 6). The tip of each measuring element of the differential transformer 272 is in contact with each of the bars to be measured 270 at the set points P _R and P _L , and each of the differential transformers 272 is a displacement of the bar to be measured 270. The amount of displacement in the front-rear direction of each of the set locations P _R , P _L , specifically, the amount of displacement δ _R , δ _L in the front-rear direction in the plane perpendicular to the axis Q can be measured. Yes.

Strictly speaking, the displacement of the table 104 depends not only on the rotational displacement but also on the axis line due to the error in the placement of the workpiece 10 with respect to the table 104, the mounting position error of each column rod 142 with respect to the table 104, the error in the rigidity of each column rod 142, etc. Displacement that the center of rotation moves in a plane perpendicular to Q also occurs (in the figure, displacement such that the axis Q moves to the axis Q ′, that is, the displacement component in the left-right direction is ΔX, and the displacement in the front-rear direction The component is represented as a displacement such that ΔY). Therefore, the rotational torque Tq received by the table 104 can be accurately grasped by measuring the rotational displacement amount excluding such displacement. In view of this, in the present bearing clamping device 100, the rotational displacement amount of the table 104 is the displacement amount that is the sum of the displacement amounts δ _R , δ _{L in} the front-rear direction of the set locations P _R , P _L. the displacement of [delta] _R of the sum ΣΔ is adapted estimated to based on _{(= δ R + δ L)} ( setting position P _R, a case where displaced front side of the apparatus + and then, conversely, the setting position P _L The displacement amount δ _L is assumed to be + when it is displaced to the back side of the apparatus). The displacement amount sum Σδ is a value in which the influence of the displacement component ΔX in the left and right direction is almost excluded since the relative movement in the left and right direction between the tip of the probe of the differential transformer 272 and the bar 270 to be measured is allowed. The value of the displacement component ΔY in the front-rear direction is almost offset. Therefore, the displacement amount sum Σδ is a parameter that can accurately estimate the rotational displacement amount around the axis Q of the table 104, in other words, corresponds to the rotational displacement amount, and is based on the displacement amount sum Σδ. Thus, the rotational torque Tq acting on the table 104 can be accurately estimated.

FIG. 14 shows the relationship between the displacement sum Σδ and the rotational torque Tq acting on the table 104. As shown in FIG. 15, the relationship is such that the rotational torque Tq is applied to the table 104 using a predetermined cone 280, and the displacements of the set points P _R and P _L measured by the differential transformer 272 in that state. δ _R and δ _L are obtained, the measurement is repeated while changing the weight of the cone 280 in various ways, and the relationship is created as a result. Incidentally, in this bearing tightening device 100, a pair of latch pins 282 are provided on the upper surface of the base plate 150 of the table 104 at positions where the axis Q is sandwiched at equal intervals (see FIG. 7). Each of the pair of cones 280 is hooked on each of the hook pins 282 so that the string is wound around a pair of rollers 284 detachably attached to the table 102, so that the rotational torque Tq is applied to the table 104. To be granted.

  As can be seen from FIG. 14, the rotational torque Tq acting on the table 104 is proportional to the displacement sum Σδ. Although not shown, the rotational torque Tq acting on the table 14 when the bevel gear 14 is rotated with the housing 12 of the work 10 fixed to the table 104 is proportional to the rotational resistance of the bevel gear 14 with respect to the housing 12. Therefore, the rotational resistance is proportional to the displacement sum Σδ when the relative rotational speed between the bevel gear 14 and the housing 12 is constant. FIG. 14 also shows the relationship between the relative rotational resistance R between the bevel gear 14 and the housing 12 with respect to the displacement sum Σδ when the relative rotational speed is constant. On the other hand, as described above, it changes depending on the degree of tightening of the two angular bearings 26 and 28, and in the bearing tightening device 100, as will be described later, relational data between the displacement amount Σδ and the relative rotational resistance R. Is stored in a computer disposed in the control panel 114, and the bearing tightening device 100 refers to the stored relational data, based on the displacement amount sum Σδ, that is, the axis line. The degree of tightening of the angular bearings 26 and 28 is managed based on the rotational displacement amount of the table 104 around the Q.

  Note that the application of the rotational torque using the cone 280 described above can be used for the verification of the bearing tightening device 100. That is, if a regular relationship between the weight of the cone 280 and the sum of displacements Σδ is created as data, the cone 104 is rotated to the table 104 using the cone 280 having a predetermined weight at the start of work or periodic inspection. When torque is applied and the displacement sum Σδ at that time becomes a value within the set range, the bearing tightening device 100 can properly manage the degree of tightening of the angular bearings 26 and 28. Judgment can be made.

  As described above, the table 104 is displaced when the rotational torque is applied. When an unscheduled rotational torque acts, such as excessive tightening, the displacement amount of the table 104 becomes excessively large, and the bearing tightening device 100 such as excessive deformation of the column 142 that supports the table 104, etc. May cause problems. Therefore, it is desirable to prevent such excessive displacement of the table 104. Therefore, the present bearing tightening device 100 includes a table displacement range restriction mechanism as a fixed base displacement range restriction mechanism, thereby restricting a range in which the displacement of the table 104 is allowed. Specifically, each of the pair of brackets 274 attached to the standing support plate 122 constituting the apparatus frame 102 is provided with a pair of regulation pins 286 (see FIG. 6). Each of the pair of restriction pins 286 is configured to be inserted into each of a pair of pin insertion holes 288 (see FIG. 7) provided in the base plate 150 of the table 104. The outer diameter of each restricting pin 286 is appropriately smaller than the diameter of each pin insertion hole 288, and although the displacement of the table 104 within a certain range is allowed, when excessive displacement occurs, at least one of them The restriction pin 286 is configured to abut against the peripheral wall surface of at least one of the pin insertion holes 288 and prevent further displacement. In the present bearing tightening device 100, the table displacement range regulating mechanism is configured by such a structure.

<Outline of control device>
The operation of the bearing tightening device 100 is controlled by a control device housed in the control panel 114. The control device is mainly a computer and has a functional configuration as shown in FIG. The control device 300 includes a bevel gear rotation device 108 that is a first rotation device, specifically, a bevel gear rotation device control unit 302 that controls the operation of a first motor 182 included in the first rotation device. A certain nut rotating device 110, specifically, a nut rotating device control unit 304 that controls a second motor 184 included in the nut rotating device 110, includes a bevel gear device control unit 302 and a nut rotating device control unit 304. A rotating device control unit 306 is configured. The bevel gear rotation device control unit 302 and the nut rotation device control unit 304 are connected to the bevel gear rotation device 108 and the nut rotation device via respective drive circuits 308 and 310 (which are inverters) housed in the control panel 114. 110.

  Further, the control device 300 includes a lifting cylinder control unit 312 that controls the operation of the lifting cylinder 130, and the lifting cylinder control unit 308 includes a drive unit (hydraulic unit) 314 housed in the control panel 114. Via the lift cylinder 130. The control device 300 further includes a fixed pin advance / retreat cylinder control unit 316 that controls the operation of the pair of fixed pin advance / retreat cylinders 164, and the fixed pin advance / retreat cylinder control unit 316 is a drive housed in the control panel 114. The unit is connected to a pair of fixed pin advance / retreat cylinders 164 via a unit 318 (having a structure including a pneumatic valve or the like).

Further, the control device 300 has a relative rotational resistance estimation unit 320. As described above, the relative rotational resistance estimation unit 320 is based on the measurement signals for the displacement amounts δ _R and δ _L from each of the pair of differential transformers 272 connected thereto, and the displacement amount sum Σδ, In other words, the rotational displacement amount estimation unit 321 is provided as a functional unit for estimating the rotational displacement amount of the table 104. Based on the displacement amount sum Σδ estimated by the rotational displacement amount estimation unit 321, the relation data storage unit The relative rotational resistance R between the bevel gear 14 and the housing 12 in the workpiece 10 is estimated with reference to the displacement amount sum-relative rotational resistance relation data stored in 322. The relative rotational resistance estimation unit 316 also determines whether or not the estimated relative rotational resistance R exceeds the relative rotational resistance threshold value _RS that is set and stored in the relationship data storage unit 316.

  The fixed pin advance / retreat cylinder control unit 316 is connected to an activation switch 324 (not shown), and the fixed pin advance / retreat cylinder control unit 316 is based on the ON signal of the activation switch 324. The retracting operation of the fixing pin 162 by 164 is started. The fixed pin advance / retreat cylinder control unit 316, the lift cylinder control unit 312 and the rotation device control unit 306 exchange signals with each other, and each of them receives signals from other function units. Based on this, the operation of the bevel gear rotating device 308 and the nut rotating device 310 is started, the rotating device unit 112 is lifted and lowered by the lifting cylinder 130, the fixed pin 162 is advanced by the fixed pin advance / retreat cylinder 164, and the like. Execute.

<Operation of bearing tightening device>
As described above, after the workpiece 10 is loaded and fixed to the table 104, the bearing tightening device 100 is operated. The operation of the bearing tightening device 100 is controlled by executing a bearing tightening device control program shown in the flowchart of FIG. Hereinafter, the operation of the bearing tightening device 100 will be described along the flowchart.

  The bearing tightening device control program is started when the start switch 324 is operated. First, in step 1 (hereinafter abbreviated as “S1”, the same applies to other steps), the fixed pin retracting cylinder 164 is operated, and the fixed pin 162 is retracted. As a result, the pair of fixing pins 162 are extracted from the pair of pin holes 168 provided in the base plate 150 of the table 104, and the fixing of the table 104 is released, that is, the displacement is allowed. In subsequent S2, the elevating cylinder 130 is operated, and the rotating device unit 112 engages the set ascending position, that is, the engaging rod 222 of the bevel gear rotating device 108 and the serration portion 22 of the bevel gear 14. Then, the engagement cylinder 224 of the nut rotating device 110 is engaged, and the angular bearings 26 and 28 are tightened to the position where the tightening nut 62 can perform the tightening operation.

After the rotation of the rotating device unit 112, the operation of the bevel gear rotating device 108 and the nut rotating device 110 is started in S3, and the rotation of the bevel gear 14 and the tightening nut 62 is started. At this time, the rotation direction of the bevel gear 14 and the rotation direction of the tightening nut 62 are the same direction, and the direction is a direction in which the tightening nut 62 is loosened when the bevel gear 14 is assumed not to rotate ( (Clockwise direction when viewed from above). The rotation speed V ₁ of the bevel gear 14 is set to a reference rotation speed Vn (for example, about 60 rpm) which is a constant rotation speed appropriate for grasping the relative rotation resistance between the bevel gear 14 and the housing 12. On the other hand, the rotational speed V ₂ of the tightening nut 62 is a speed (Vn−ΔV _A ) that is smaller than the bevel gear rotational speed V ₁ by a first rotational speed difference ΔV _A (for example, about 5 to 10 rpm). Thus, relative rotation in the direction of tightening nut 62 is tightened to the fastening nut 62 and the bevel gear 14, fastening nut 62 would be tightened at a rate of [Delta] V _A relative to the bevel gear 14.

In the next S4, the relative rotational resistance R between the bevel gear 14 and the housing 12 is estimated. As described above, this estimation is performed based on the displacement amounts δ _R and δ _L of the two setting locations P _R and P _L of the table 104 measured by the differential transformer 272. More specifically, a displacement amount sum Σδ, which is the sum of these displacement amounts δ _R and δ _L , is obtained by calculation, and with the obtained displacement amount sum Σδ, the rotational displacement amount around the axis Q of the table 104 and In addition, the value of the relative rotation resistance R corresponding to the displacement amount sum Σδ is read from the displacement amount sum-relative rotation resistance relationship data stored in the relationship data storage unit 322, thereby estimating the relative rotation resistance R. Is done. That is, in S4, the relative rotational resistance R is estimated based on the rotational displacement amount of the table 104. Subsequently, in S5, it is determined whether or not the estimated relative rotational resistance R is _{equal to} or greater than a set first relative rotational resistance threshold R _S1 . The first relative rotation resistance threshold value R _S1 is set to a value that can be determined to have approached to some extent a relative rotation resistance value (a second relative rotation resistance threshold value R _S2 described later) that should be possessed at the tightening degree that is the management target. (See FIG. 14). The estimation process of S4 and the determination process of S5 are repeatedly executed at extremely short time intervals (for example, several milliseconds) until the relative rotational resistance R reaches the first relative rotational resistance threshold value R _S1 . If it is determined in S5 that the relative rotational resistance R has reached the first relative rotational resistance threshold value R _S1 , the next S6 is executed.

In S < _b > 6, the tightening nut rotation speed V < _b > _{2 that} is the rotation speed is increased in the tightening nut 62. Specifically, the tightening nut rotation speed V ₂ is rotated based on a second rotation speed difference ΔV _B (for example, about 1 to 2 rpm) set to a value smaller than the first rotation speed difference ΔV _A. The speed is increased to (Vn−ΔV _B ). As a result, the relative rotational speed of the tightening nut 62 and the bevel gear 14 is reduced, and the tightening nut 62 is tightened at a speed of ΔV _B which is a slower speed than before. The reduction in the tightening speed is performed in order to prevent excessive tightening and accurately control the tightening degree.

In subsequent S7, in a state where the tightening speed is reduced, the relative rotational resistance R between the bevel gear 14 and the housing 12 is estimated by the same processing as in the previous S4. In S8, the same processing as in the previous S5 is performed. By this process, it is determined whether or not the relative rotational resistance R is _{equal to} or greater than the second relative rotational resistance threshold value R _S2 set as the management target. These processes of S7 and S8 are repeatedly executed at extremely short time intervals until the relative rotational resistance R reaches the second relative rotational resistance threshold value R _S2 , similarly to S4 and S5. If it is determined in S8 that the relative rotation resistance R has reached the second relative rotation resistance threshold value R _S2 , the operation of the bevel gear rotation device 108 and the nut rotation device 110 is stopped in the next S9. Thereby, the rotation of both the bevel gear 14 and the tightening nut 62 is stopped, that is, the relative rotational speed between the bevel gear 14 and the housing 12 is set to 0, and the angular bearings 26 and 28 are tightened by the tightening nut 62. Is completed with the target tightening degree.

  After the tightening is completed, in the next S10, the elevating cylinder 130 is operated, the rotating device unit 112 is lowered to the initial position, and in the subsequent S11, the fixed pin retracting cylinder 164 is operated. The fixed pins 162 are advanced, so that the pair of fixed pins 162 are fitted into the pair of pin holes 168 provided in the base plate 150 of the table 104 so that the table 104 prohibits displacement. Fixed. A series of processes as described above are executed, and the tightening operation for one workpiece 10 is completed. The workpiece 10 that has been subjected to the tightening operation is released from the table 104 and is unloaded from the bearing tightening device 100 together with the pallet 144.

  Referring to the relationship between the processing of each step in the tightening operation and the functional units of the control device 300 described above, the control device 300 includes a portion that executes the processing of S1 and S11, and includes a fixed pin advance / retreat cylinder control unit 316. However, the lifting cylinder control unit 312 including the part that executes the processes of S2 and S10 includes the part that executes the process related to the operation of the bevel gear rotating apparatus 108 in S3 and S9. In addition, the nut rotating device control unit 304 includes a portion that executes the processing of the nut rotating device 110 in S9 and a portion that executes the processing of S6, and a portion that executes the processing of S4, S5, S7, and S8. The relative rotation resistance estimation unit 320 is configured.

  Further, in the bearing tightening device 100, the displacement amount sum Σδ is obtained based on the measurement result by the differential transformer 272 in S4 and S7. As described above, the portion that performs the process of obtaining the displacement amount sum Σδ and estimating the rotational displacement amount of the table 104 constitutes the rotational displacement amount estimation unit 321, and this bearing tightening In the device 100, a fixed base displacement amount detection device is configured including the differential transformer 272 and the rotational displacement amount estimation unit 321 thereof. Further, the process of estimating the relative rotational resistance R in S4 and S7 is an estimation process based on the detection result of the fixed base displacement amount detection device, and the process by the rotation device control unit 306 in S6 and S9, that is, The process of controlling the relative rotational speed of the bevel gear 14 and the housing 12 by controlling at least one of the bevel gear rotation device 108 and the nut rotation device 110 is also an estimation process based on the detection result of the fixed base displacement amount detection device. ing. Therefore, the control device 300 functions as a detection result dependence processing execution device.

In this bearing tightening device 100, as described above, the rotation direction of the bevel gear 14 and the tightening nut 62 is the direction in which the tightening nut 62 is loosened when it is assumed that the bevel gear 14 does not rotate. However, it is also possible to perform tightening by rotating in the reverse rotation direction (counterclockwise direction when viewed from above). In this case, for example, the bevel gear rotation speed V ₁ is set as the reference rotation speed Vn, and the tightening nut rotation speed V ₂ is larger than the reference rotation speed Vn by the first rotation speed difference ΔV _A or the second rotation speed difference ΔV _B. What is necessary is just to make it rotate at speed. Incidentally, in this case, since the table 104 is also rotationally displaced in the reverse direction, the handling of the signs of the displacement amounts δ _R and δ _L and the displacement amount sum Σδ is also reversed. Further, the relative rotational speed between the bevel gear 14 and the housing 12 may be changed not by controlling the operation of the nut rotating device 110 but by controlling the operation of the bevel gear rotating device 108.

<Modification>
Below, the bearing fastening device as a modified example will be briefly described after explaining the work to be worked on.

  A workpiece 350 that is a work target of the bearing tightening device of the modified example has a structure shown in a cross section in FIG. 18, and is rotatably held by a shaft holding cylinder 352 as a shaft holder and the shaft holding cylinder 12. And a shaft member 354 as a shaft body. The shaft holder 352 has a generally cylindrical shape, and the shaft member 354 has two angular tapered roller bearings 356 and 358 (hereinafter simply referred to as “angular bearings 356 and 358) disposed on the inner peripheral surface of the shaft holder 352. ”), And is held rotatably. These two angular bearings 356 and 358 are held by outer races 360 and 362, inner races 364 and 366, and retainers, respectively, as with the workpiece 10 in the previous embodiment, and the outer races 360 and 362 and the inner race, respectively. It includes a plurality of tapered rollers 370 and 372 as rolling elements interposed between 364 and 366.

  The shaft member 354 has a large-diameter portion 382 at an intermediate portion of the shaft portion 380. The large-diameter portion 382 includes two angular bearings 356 and 358 arranged so as to sandwich the inner races 364 and 366 therebetween. It is installed. The large diameter portion 382 functions as an access prohibition portion that prohibits the inner races 364 and 366 from approaching each other. Further, the upper end portion of the shaft holding cylinder 352 in the drawing is a locking ring portion 384 projecting annularly inward, and the upper angular bearing 356 has an upper end connected to the outer race 360 by the locking ring portion 364. By being locked, upward movement is prohibited. Between the outer races 360 and 362 of the two angular bearings 356 and 358, a spacer 386 similar to that of the workpiece 10 of the previous embodiment is interposed. A female thread 390 is formed on the inner surface of the lower end portion of the shaft holding cylinder 352, and a tightening ring 392 as a bearing tightening member in which a male thread is formed on the outer periphery of the female thread 390 is screwed. The attached ring 392 is in a state of abutting against the lower surface of the outer race 362 of the angular bearing 358 positioned below, and the two angular bearings 356 and 358 are tightened by rotating the tightening ring 392. An engagement groove 394 for engagement with a ring rotating device described later is provided on the lower surface of the tightening ring 392 when tightening. The engaging grooves 394 are formed so as to extend in the radial direction at each of four equally spaced positions in the circumferential direction.

  An upper end portion of the shaft member 354 is a flange portion 396. As will be described later, the workpiece 350 is fixed to a fixing base of the bearing tightening device at the flange portion 396. Further, the lower end portion of the shaft holding cylinder 352 is a rectangular flange portion 398 having a rectangular shape. As will be described later, the angular flange portion 398 is engaged with the shaft holding cylinder rotating device. In the workpiece 350 as well, the relative rotational resistance between the shaft member 354 and the shaft holding cylinder 352 varies depending on the degree of tightening of the angular bearings 356 and 368 as in the workpiece 10 described above.

  The bearing tightening device 400 of the present modification whose main part is shown in FIG. 19 is similar to the bearing tightening device described above, the device frame as the device body, the fixed disk 402 as the fixing base for fixing the work, and the rotation The apparatus unit 404 includes a control panel and the like. In the figure, only a part of the device frame, the fixed disk 402, the rotating device unit 404, and the like are shown.

  The fixed disk 402 is disposed horizontally, and on the lower surface, the work 350, specifically, the flange portion 396 of the shaft member 354 included in the work 350 is fixed detachably by a fixing mechanism (not shown). In a state where the workpiece 350 is fixed, the shaft member 354 is positioned in the center of the fixed disk 402 so that its axis is vertical, that is, at right angles to the fixed disk 402. The fixed disk 402 is supported by two hanging pillars 406 forming a part of the apparatus frame by a pair of support plates 408 as support members constituting a fixed base support mechanism. Each of the pair of support plates 408 is relatively thin, generally triangular and slightly curved, and is disposed vertically, one side of which is secured to the hanging post 406, and A top portion facing one side is fixed to the fixed disk 402. From such a structure, the support plate 408 firmly supports the weight of the fixed disk 402 and the workpiece 350 fixed thereto, and a force around the axis of the shaft member 354 acts on the fixed disk 402 as described later. In this case, it is easily bent elastically deformed. That is, also in the bearing tightening device 400, the support plate 408 causes the fixed disk 402 to move in a certain range in an arbitrary direction within a plane perpendicular to the axis of the shaft member 354 in a state where it does not receive frictional resistance. It is supposed to be elastically supported while allowing.

  The structure of the rotation device unit 404 is substantially the same as that of the rotation device unit 112 described above. However, the bevel gear rotation device 108 in the previous rotation device unit 112 is a fastening ring rotation device 412 as the second rotation device in the rotation device unit 404, and the nut rotation device 110 is the first rotation device. This is a shaft holding cylinder rotating device 414. Therefore, the engagement outer cylinder 416 included in the shaft holding cylinder rotating device 414 has a rectangular fitting hole that engages with the angular flange portion 398 of the shaft holding cylinder 352, and the tightening ring rotating device 412 includes. The engagement inner cylinder 418 is disposed so as to be accommodated in the engagement outer cylinder 416, and is provided with a fitting protrusion that engages with the engagement groove 394 of the tightening ring 392. The details of the specific structure are substantially the same as those of the previous rotating device unit 112, and thus the description thereof is omitted here. Further, the rotating device unit 404 is also moved up and down by the lifting cylinder as in the case of the rotating device unit 112 described above.

  Since the management of the degree of tightening of the angular bearings 356 and 358 in the bearing tightening device 400 is performed in accordance with the same concept as that of the previous bearing tightening device 100, the description thereof is omitted here. However, the amount of displacement of the fixed disk 402 is measured using a pair of CCD cameras 420 that are imaging devices, without using a differential transformer. On the outer peripheral surface of the fixed disk 402, reference marks 422 are provided at each of two positions across the center. Each of the locations where the two reference marks 422 are provided is a set location. In the present bearing fastening device 400, each of the reference marks 422 is obtained by performing image processing on an image obtained by imaging the reference mark 422. By recognizing the displacement, the amount of displacement at each of these set points is measured.

  The configuration of the control device included in the bearing tightening device 400 is the same as that of the previous bearing tightening device 100, and the operation of the bearing tightening device 400 is the same as that of the previous bearing tightening device 100. Therefore, the description here is omitted.

  Considering the bearing tightening device 400 of the present modification and the bearing tightening device 100 of the embodiment described above together, the bearing tightening device according to the present invention rotates the shaft body by fixing the shaft holder. It can be understood that the device may be a device configured such that the shaft body is fixed and the shaft holder is rotated. In addition, it can be understood that the fixing base provided in the bearing tightening device is not limited to a narrow base. Furthermore, the fixed base support mechanism is not limited to a support member having a support column, and allows displacement in any direction within a plane perpendicular to the axis of the shaft body in a state where the fixed base is not subjected to frictional resistance. However, it can be seen that various mechanisms that elastically support can be employed. Furthermore, the specific configuration of the fixed base displacement amount detection device is not particularly limited, and it can be easily understood that various set location displacement amount measuring devices can be employed. Again, the bearing clamping device of the present invention is in no way limited to the device of the above embodiment, and is based on the knowledge of those skilled in the art including the mode described in the above-mentioned [Mode of Invention]. The present invention can be implemented in various modes with various changes and improvements.

It is a front view which shows the workpiece | work used as the work object of the bearing fastening apparatus of an Example. It is side surface sectional drawing of the workpiece | work shown in FIG. It is an exploded view in the side surface cross section of the workpiece | work shown in FIG. It is a whole perspective view which shows the bearing fastening apparatus of an Example. It is a disassembled perspective view of the bearing fastening apparatus shown in FIG. It is a fragmentary perspective view which shows the principal part of the apparatus frame which comprises a bearing clamping device. It is a perspective view which shows the table unit which comprises a bearing clamping device. It is a perspective view which shows the mode of the workpiece | work carrying in to the table with which a table unit is provided. It is a perspective view which shows the state by which the workpiece | work was fixed to the table. It is a perspective view which shows the rotating device unit which comprises a bearing clamping device. It is sectional drawing of the rotating apparatus unit shown in FIG. It is a perspective view which shows the mode of the displacement of the table which arises depending on the rotation resistance of the bevel gear with respect to the housing of a workpiece | work when a bearing clamping device is operated. It is a top view which exaggerates and shows the displacement of the table shown in FIG. It is a graph which shows the relationship between the amount of table displacement, the rotational torque which acts on a table, and the relative rotational resistance of a bevel gear and a housing. It is a perspective view which shows a mode that a rotational torque is made to act on a table using a cone. It is a functional block diagram which shows the principal part of the control apparatus which manages control of a bearing clamping device. It is a flowchart which shows the bearing clamping device control program for controlling the action | operation of a bearing clamping device. It is sectional drawing which shows the workpiece | work used as the work object of the bearing fastening apparatus of a modification. It is a perspective view which shows the principal part of the bearing fastening apparatus of a modification.

Explanation of symbols

10: Workpiece (assembly) 12: Housing (shaft holder) 14: Bevel gear (shaft body) 26, 28: Angular tapered roller bearing (rolling bearing, angular rolling bearing) 30, 32: Outer race 34, 36: Inner race 54: Access prohibition section 60: Male thread section 62: Clamping nut (bearing tightening member, nut member) 100: Bearing tightening device 102: Device frame (device main body) 104: Table (fixing base) 108: Bevel gear rotating device (First rotating device) 110: Clamping nut rotating device (second rotating device) 142: Support rod (fixed base support mechanism, support member, support column) 162: Fixed pin (fixed base displacement prohibiting mechanism) 270: Bar to be measured (Setting location) 272: Differential transformer (Setting location displacement measuring instrument) 286: Restriction pin (Solid table displacement range restriction mechanism) 300: Control device 30 : Bevel gear rotating device control unit 304: nut rotating device control unit 306: rotating device control unit 320: relative rotation resistance estimating unit 321: rotational displacement amount estimating unit 350: work (assembly) 352: shaft holding cylinder (shaft holding body) 354: Shaft member (shaft body) 356, 358: Angular tapered roller bearing (rolling bearing, angular rolling bearing) 360, 362: Outer race 364, 366: Inner race 382: Large diameter portion (access prohibition portion) 390: Female screw 392 : Fastening ring (bearing fastening member) 400: bearing fastening device 402: fixed disk (fixed base) 408: support plate (fixed base support mechanism, support member) 412: ring fastening device (second rotating device) 414 : Shaft holding cylinder rotating device (first rotating device) 420: CCD camera (setting position displacement measuring device) 422: Reference mark (setting position)

Claims (9)

(a) a shaft body, (b) a shaft holder that holds the shaft body, and (c) the shaft body and the shaft holder are arranged coaxially and spaced apart from each other in the axial direction. Two rolling bearings for coupling the shaft body and the shaft holding body so as to be relatively rotatable in a state of receiving a load of (d), and (d) screwing with a screw provided on one of the shaft body and the shaft holding body The two rolling bearings are tightened with respect to an assembly including a bearing tightening member that tightens the two rolling bearings in the axial direction when the two rolling bearings are rotated by themselves. A bearing tightening device for
The device body;
A fixing base to which the other of the shaft body and the shaft holder is fixed;
A fixed base support mechanism provided in the apparatus main body and elastically supporting the fixed base while permitting displacement in an arbitrary direction within a plane perpendicular to the axis of the shaft body in a state in which frictional resistance is not received. When,
A first rotation device that is provided in the device main body and rotates one of the shaft body and the shaft holder;
A second rotating device provided in the device main body and rotating the bearing fastening member;
A fixed base displacement detection device that detects a rotational displacement amount of the fixed base around the axis of the shaft due to relative rotation between the shaft body and the shaft holder;
E Bei a detection result rely processing execution apparatus for executing processing based on a detection result of the fixing base displacement amount detection device,
The fixed base support mechanism is
Each is fixed to the apparatus main body at one end and fixed to the fixing base at the other end, and is erected on the apparatus main body to support the fixing base and bend elastically in any direction. Consists of a plurality of deformable struts,
The fixed base displacement amount detection device comprises:
A plurality of set point displacement amount measuring devices each measuring a displacement amount in each setting direction of a plurality of points set apart from each other in a plane perpendicular to the axis of the shaft of the fixed base;
A rotational displacement amount estimating unit for estimating a rotational displacement amount around the axis of the shaft body of the fixed base based on the measurement results of the plurality of set location displacement amount measuring instruments;
A bearing fastening device comprising: The bearing tightening device according to claim 1, wherein the first rotating device and the second rotating device are disposed between the fixed base and the device main body. The fixed base displacement amount detection device comprises:
As the plurality of set location displacement amount measuring devices, each is a displacement amount of each of two locations sandwiching the axis on a straight line passing through the axis of the shaft body, and a displacement amount in a direction orthogonal to the straight line. The bearing tightening device according to claim 1 or 2, comprising two set point displacement measuring instruments for measurement. The two set location displacement measuring instruments measure the amount of displacement at each of the two locations where the distance from the axis of the shaft body is equal to each other,
The rotational displacement amount estimation unit calculates a rotational displacement amount around the axis of the shaft body of the fixed base based on a sum of displacement amounts of the two locations measured by the two set location displacement amount measuring instruments. The bearing tightening device according to claim 3, which is to be estimated. The bearing tightening device is
By operating the first rotating device and the second rotating device at the same time, one of the shaft body and the shaft holding body and the bearing fastening member are rotated relative to each other, and the two rotations are caused by the relative rotation. The bearing tightening device according to any one of claims 1 to 4, wherein the bearing is tightened. The detection result-based processing execution device controls the operation of at least one of the first rotating device and the second rotating device based on the detection result by the fixed base displacement amount detector, and the shaft body and the shaft The bearing tightening device according to claim 5, further comprising a rotating device control unit that controls a relative rotational speed between one of the holding body and the bearing tightening member. The detection result rely processing execution apparatus, based on a detection result by the fixed base displacement amount detecting apparatus, according to claim 1 having a relative rotation resistance estimator for estimating a resistance to relative rotation between the shaft holding member and the shaft member The bearing fastening device according to any one of claims 6 to 6 . The bearing tightening device according to any one of claims 1 to 7, wherein the bearing tightening device includes a fixed base displacement prohibiting mechanism that prohibits displacement of the fixed base. The bearing tightening device according to any one of claims 1 to 8, wherein the bearing tightening device includes a fixed base displacement range regulating mechanism that regulates a range in which the displacement of the fixed base is allowed.

Images