JP2010089179A - Bearing mounting auxiliary device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To convert a variable physical amount correlated to a variation parameter for determining a relative position into a signal by a sensor while increasing interference of an inner ring of a tapered hole and more exactly obtain the variation parameter by arithmetic operation using the measured value of the variable physical amount and inputted information. <P>SOLUTION: A bearing mounting auxiliary device includes a sensor installation part 11d recessed at an axis side between a mutually fitting surface 11a at an axis 2 side and a male screw 11b of an outer diameter surface of an adapter sleeve 11. When a fitting position is relatively moved while the sensor 12 is interposed between the mutually fitting surface 1b of the inner ring 1 and the sensor installation part 11d, the sensor 12 sends an electric signal allowing the contact pressure of the mutually fitting surfaces 1b, 11a to be converted as the variable physical amount to an arithmetic element 13. The arithmetic element 13 obtains the interference of the inner ring 1 or the like and displays it by an arithmetic operation using correlation between the contact pressure of the mutually fitting surfaces 1b, 11a, and the actually generated interference of the inner ring 1 and an inner clearance. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  This invention relates to the interference of the inner ring and the radial clearance inside the bearing while the interference of the inner ring is increased by relatively moving the fitting position of the inner ring of the tapered hole and the fitting surface on the shaft side in the axial direction. The present invention relates to a bearing mounting auxiliary device capable of measuring and displaying a change in a parameter for determining a relative position.

  When fitting the bearing ring of a rolling bearing to the shaft or housing with an interference, in order to prevent damage or seizure of the race and rolling elements, the clearance of the bearing ring and the radial clearance inside the bearing Simply called “internal clearance”) within a proper range.

  Conventionally, in order to perform the above-described management when the bearing is mounted, a tapered hole bearing having an inner ring with a tapered hole has been used. If the fitting position of the inner ring and the shaft-side fitting surface is moved relative to the axial direction so that the inner ring interference margin increases from the neutral fitting position where the inner ring interference margin is “0”, the inner ring fitting surface As the surface pressure increases and the inner ring expands as a whole, the inner ring raceway diameter increases and the internal clearance decreases. Therefore, the interference of the inner ring and the internal clearance can be adjusted by the relative movement amount in the axial direction.

  Actually, it is troublesome to confirm that the inner ring is in the neutral fitting position. Therefore, while increasing the interference of the inner ring by relatively moving the fitting position of the inner ring of the tapered hole and the fitting surface on the shaft side in the axial direction, the fluctuation physical quantity correlated with the fluctuation parameter for determining the relative position is detected by the sensor. There is used a bearing mounting auxiliary device that converts a signal into a signal and obtains the variation parameter by an arithmetic process using the measured value of the variation physical quantity obtained from the signal and already input information (Patent Document 1).

  The bearing mounting auxiliary device disclosed in Patent Document 1 uses a fluctuation parameter as an internal clearance and a fluctuation physical quantity as a circumferential strain on the side surface of the inner ring. The sensor consists of a strain-electric signal converter attached to the side of the inner ring. The measured circumferential strain is converted into a reduction amount of the internal clearance by the arithmetic unit. The initial internal clearance set at the time of manufacturing the tapered bore bearing is input in advance to the calculator. The computing unit displays the internal clearance obtained using the initial internal clearance and the amount of decrease in internal clearance. Even if the amount of movement in the axial direction is unknown, the operator can determine the relative axial direction position of the inner ring and the fitting surface on the shaft side to an appropriate position from the value of the displayed internal clearance. .

Japanese Patent Laid-Open No. 8-11028

  However, non-uniformity of the residual stress of the inner ring may exist as a cause of error that disturbs the theoretical correlation between the circumferential distortion generated on the side surface of the inner ring, the interference of the inner ring, the reduction amount of the internal clearance, and the like. If this cause of error exists, the bearing mounting auxiliary device disclosed in Patent Document 1 obtains the variation parameter based on the circumferential distortion with the above-described correlation disorder, and the accuracy of the output value of the variation parameter is increased. There is a risk of missing.

  In view of the above circumstances, the object of the present invention is to convert a fluctuation physical quantity correlated with a fluctuation parameter for determining the relative position into a signal by a sensor while increasing the interference of the inner ring of the tapered hole, and measure the fluctuation physical quantity. This is to make it possible to obtain the variation parameter more accurately by the arithmetic processing using the value and the already input information.

  In order to achieve the above object, the present invention is designed to determine the relative position while increasing the interference of the inner ring by relatively moving the fitting position of the inner ring of the tapered hole and the fitting surface on the shaft side in the axial direction. In the bearing mounting auxiliary device for converting the fluctuation physical quantity correlated with the fluctuation parameter into a signal by a sensor, and obtaining the fluctuation parameter by a calculation process using the measured value of the fluctuation physical quantity obtained from the signal and already input information, the inner ring And a sensor installation portion that is recessed from one side of the shaft-side fitting surface, and the relative movement is performed with the sensor interposed between the inner ring and the other side of the shaft-side fitting surface and the sensor installation portion. The sensor employs a configuration that converts the surface pressure of the fitting surface as the variable physical quantity.

  Here, the internal clearance refers to the radial clearance inside the tapered bore bearing. The concepts of radial direction and axial direction are based on the bearing center axis. The variation parameter refers to at least one physical quantity of the inner ring interference and the internal clearance used to determine the relative axial position of the inner ring and the shaft-side fitting surface.

  According to the configuration of the present invention, since the sensor installation portion that is recessed from one side of the inner ring and the shaft-side fitting surface is provided, by utilizing the space of the sensor installation portion, the other side of the inner ring and the shaft-side fitting surface A sensor can be interposed between the sensor installation part. Since relative movement is possible in this intervening state, the surface pressure of the fitting surface generated by the pressing of the fitting surface on the inner ring and the shaft side can be applied to the sensor, and the surface pressure can be converted into a signal by the sensor. There is a correlation between the surface pressure of the fitting surface, the interference of the inner ring and the internal clearance. Relational expressions for obtaining variation parameters based on these correlations and other related physical quantities included in the relational expressions can be defined as already input information. Therefore, if the measured value of the surface pressure of the fitting surface is known as the variable physical quantity, the variable parameter can be obtained by arithmetic processing by the bearing mounting auxiliary device. The surface pressure of the fitting surface is determined by the actually generated interference of the inner ring regardless of whether or not the residual stress non-uniformity is affected. Therefore, the bearing mounting auxiliary device according to the present invention can more accurately determine the fluctuation parameters such as the interference of the inner ring from the surface pressure of the fitting surface as compared with that of Patent Document 1.

  Specifically, the sensor installation part can adopt a configuration formed on the shaft side.

  In order to measure the surface pressure of the fitting surface with a sensor, the sensor is brought into contact with the other surface of the fitting surface, and the surface pressure of the fitting surface is supported by the sensor installation portion via the sensor. When the sensor installation part is recessed from the fitting surface of the inner ring, the inner surface of the inner ring is less than the conventional product, so the shape of the inner ring raceway surface, for example, the roundness of the raceway surface and the raceway surface in the axial section view, This can contribute to the collapse of the bus bar shape. In addition, the inner ring is made into a dedicated product, and the standard and conventional inner rings cannot be used. If the sensor installation part is formed on the shaft side, these problems do not occur.

  Forming the sensor installation portion on the shaft side includes forming the sensor installation portion on the shaft or sleeve.

  The sensor installation portion is preferably formed on the outer diameter surface of the sleeve fitted to the inner ring and the shaft. Here, the sleeve has a cylindrical fitting surface on its inner diameter surface and a shaft-side fitting surface formed on its outer diameter surface.

  Generally, the sleeve is employed for the purpose of avoiding the formation of a conical fitting surface on the outer diameter surface of the shaft. If the sensor installation portion is formed on the sleeve, the sensor installation portion is not formed on the outer diameter surface of the shaft as well as the inner ring, and a decrease in the strength of the inner ring and the shaft can be avoided. Moreover, since neither the inner ring nor the shaft needs to be machined, the bearing mounting auxiliary device according to the present invention can be used without making any changes to the rolling bearing and shaft already in use.

  Preferably, the sleeve is formed with an axial cut, and the sensor wiring is led from the inner ring through the sleeve.

  If the slit in the axial direction is formed on the sleeve, the fitting operation to the shaft can be easily performed. When the sensor is wired, the sensor wiring can be cut through the sleeve. For this reason, there is no need to form a dedicated groove or space for the wiring in the sleeve. The sensor wiring passes through the inner ring and does not get in the way when the inner ring and the sleeve move relative to each other. Various types of sleeves with cuts are generally available as adapter sleeves or removal sleeves, depending on the main dimensions of the bearing, shaft diameter, etc., such as hydraulic and non-hydraulic types. Can do.

  For the purpose of tightening the nut for fixing the relative movement and axial position, or tightening the removal nut to the removal sleeve, screw the shaft on the shaft or the outer diameter surface of the sleeve with a fitting surface. May form. When forming this type of male screw, it is necessary to secure screw theft for escaping a tool for cutting the male screw. If the screw stealing space is used, the sensor installation portion can be efficiently formed.

  Specifically, a male screw for a nut is formed on a shaft-side outer diameter surface having a fitting surface on the shaft side, and the sensor installation portion is recessed between the fitting surface on the shaft side and the male screw. It is possible to adopt a configuration that is used. Here, the outer diameter surface on the shaft side refers to the outer diameter surface of the shaft or the sleeve.

  Since the shaft-side fitting surface and the male screw are provided on the outer diameter surface of the shaft or sleeve, the sensor installation portion can be formed between the shaft-side fitting surface and the male screw. Thereby, since it becomes a series of dents which served as a screw stealer and a sensor installation part, processing becomes easier than forming a screw stealer and a sensor installation part separately. For example, the sensor installation part can be a dent facing the central part of the width of the fitting surface of the inner ring, but the cutting process of the outer diameter surface on the shaft side and the molding die for forming the screw stealing part and the sensor installation part Will be done separately. If the screw stealer and sensor installation part are in series, the sensor installation part can be formed in the male screw cutting process if the sensor fits in the screw stealer, and even if the sensor does not fit in the screw stealer All you need to do is cut off the excess in the process.

  Since the sensor is brought into contact with the fitting surface on the other side, the sensor installation portion is conventionally formed on the portion that was the fitting surface on the one side. In the part where the sensor comes into contact with the inner diameter surface of the inner ring, the inner ring side can be supported in the radial direction on the shaft side via the sensor. However, for example, when the support of the inner ring through the sensor can be insufficient, as in the case of employing a sensor that is smaller than the space of the sensor installation part, it is preferable to consider securing the raceway shape of the inner ring. .

  Specifically, it is possible to employ a configuration in which the sensor installation portion is provided so as to be separated from a radial plane that intersects the raceway surface of the inner ring. Here, deviating from the radial plane that intersects the raceway surface of the inner ring means that the radial plane that intersects the raceway surface of the inner ring does not intersect the sensor installation portion at any of the fitting positions within the range where the relative movement is possible. Say. One end of the range where relative movement is possible is the neutral fitting position where the inner ring interference is “0”, and the other end is the fitting position where the inner ring interference is the maximum and the internal clearance is the narrowest. is there.

  As described above, if the sensor installation part is provided so as to be separated from the radial plane that intersects the raceway surface of the inner ring, the inner ring is located inward of the raceway surface of the inner ring regardless of the size of the inner ring. And the fitting area on the shaft side is secured. For this reason, the collapse of the bus bar shape of the raceway surface of the inner ring can be ensured in the space of the sensor installation portion as in the conventional case.

  Further, the sensor may be configured to be provided so as to cover the entire circumferential length of the sensor installation portion. Here, the circumferential direction refers to the circumferential direction around the bearing central axis.

  If there is a space with a circumferential length between the sensor installation part and the sensor, the inner ring inner surface cannot be unevenly supported in the circumferential direction as the inner ring interference increases, and the raceway surface This contributes to the loss of roundness. On the other hand, considering the portion where the sensor is interposed, the sensor contact portion of the inner ring is supported in the radial direction on the shaft side via the sensor because of the structure that gives the sensor the surface pressure of the fitting surface. If the sensor is provided so as to cover the entire length in the circumferential direction of the sensor installation part, a space having a circumferential length is not generated between the sensor and the sensor installation part. Can do. In order to ensure roundness, it is not essential to support the inner diameter surface of the inner ring over the entire circumference. This is because it may be considered that the conventional sleeve is allowed to be cut in the axial direction.

  The sensor may be any sensor that can convert the surface pressure of the fitting surface in the entire range in which relative movement is possible, and a known sensor that is used for measuring the pressure of the solid surface can be adopted. For example, a pressure-sensitive rubber, a piezoelectric element, a strain generating body or the like is applied with surface pressure, and the surface pressure is converted into an electric signal. The overall sensor form including the pressure conversion function part and the mounting part for fixing to the sensor installation part, the form of the sensor installation part is appropriately determined from the mutual form, processing method, secure sensor space, etc. can do.

  For example, it is possible to adopt a configuration in which the sensor is an end ring having a cut in the axial direction and is provided so as to be fitted into the sensor installation portion.

  If a sensor is made into an end ring and it is made to fit in a sensor installation part, a sensor can be easily installed in a sensor installation part like a C type retaining ring. Either the aspect which makes it an end ring body only by a pressure conversion function part, or the aspect which makes an end ring body by a pressure conversion function part and another function part may be sufficient.

  The above-described specific configurations depending on the configuration of the present invention can be appropriately combined and employed as long as the individual specific configurations exhibit the intended operational effects.

  For example, a specific configuration in which a screw is formed on an outer diameter surface on the shaft side having a fitting surface on the shaft side, and the sensor installation portion recessed between the male screw and the fitting surface on the shaft side is formed. Is suitable for use in combination with a specific configuration for preventing the bus bar shape of the raceway surface from collapsing and a specific configuration for facilitating mounting of the sensor, or in combination with both. That is, conventionally, the screw stealing of the sleeve is formed at the end of the fitting surface on the shaft side, and the sensor installation part using the screw stealing can be easily removed from the radial plane including the raceway surface of the inner ring. This is because the groove-shaped sensor installation portion into which the sensor of the end-like annular body is fitted can be formed by using a turning process for forming a male screw.

  As described above, the present invention includes a sensor installation portion that is recessed from one side of the inner ring and the shaft-side fitting surface, and the sensor is interposed between the other side of the inner ring and the shaft-side fitting surface and the sensor installation portion. While the fitting position of the inner ring and the shaft-side fitting surface is moved relative to each other in the axial direction, the surface pressure of the fitting surface is converted into a signal by the sensor as a variable physical quantity, and the measured value and the existing input information are used. Thus, the variation parameter for determining the relative position can be obtained by the calculation processing, so that the variation parameter can be obtained more accurately.

Embodiments according to the present invention will be described below with reference to the accompanying drawings.
As shown in FIGS. 1 and 2, a bearing mounting auxiliary device according to the embodiment (hereinafter simply referred to as “this bearing mounting auxiliary device”) includes a sleeve 11 fitted to the inner ring 1 and the shaft 2 of a tapered hole, It comprises a sensor 12 that converts pressure into a signal, and a calculator 13 that receives a signal from the sensor 12.

  The inner ring 1 having a tapered hole includes a raceway surface having a raceway surface 1a on its outer diameter surface and a conical fitting surface 1b on its inner diameter surface.

  The sleeve 11 is an adapter sleeve having a conical shaft-side fitting surface 11a on the outer diameter surface and a male screw 11b for a nut and having a slit 11c in the axial direction.

  The tapered bore bearing provided with the inner ring 1 uses an adapter constituted by a sleeve 11, a nut 3 attached to and detached from the male screw 11 b, and a washer 4 interposed between the side surface of the inner ring 1 and the nut 3. The fitting positions of the fitting surfaces 1b and 11a on the shaft 2 side are relatively moved in the axial direction, and can be fixed to the positional relationship after the relative movement.

  The sleeve 11 includes a sensor installation portion 11d that is recessed from the fitting surface 11a on the shaft 2 side. 11 d of sensor installation parts are dented in the axial center side between the fitting surface 11a by the side of the axis | shaft 2 of the outer diameter surface of the sleeve 11, and the external thread 11b.

  The sleeve 11 is, for example, NTN catalog CAT. No. A well-known specification disclosed in 4201-II / J can be used to add a sensor installation portion 11d, and an adapter sleeve, a removal sleeve, a hydraulic sleeve, or the like can be used.

  The sensor 12 includes a pressure conversion function part 12a that converts an applied pressure into an electric signal and a mounting part 12b that is provided in a C-shaped concentric ring, and as a whole, has a cut in the axial direction. It is made into the end ring body.

  The pressure conversion function part 12a is composed of a pressure-sensitive surface provided on the outer diameter surface of the attachment part 12b, and generates a corresponding electrical signal by causing a deformation corresponding to the pressure to change the electrical resistance. The pressure-sensitive surface can be formed of a functional material such as a pressure-sensitive rubber or a piezoelectric element.

  The sensor installation portion 11d is formed on the sleeve 11 in a series of processes for turning the male screw 11b in order to serve as screw stealing. For this reason, the sensor installation portion 11d is recessed from the entire length in the circumferential direction of the fitting surface 11a on the shaft 2 side, and forms a groove shape with a step with the fitting surface 11a and a step with the thread of the male screw 11b. . In addition, the sensor installation part 11d is a groove bottom having the same diameter as the valley diameter of the external thread 11b in order to simplify the turning.

  As is clear from the drawing, the sensor 12 is provided so as to cover the entire circumferential length of the sensor installation portion 11d. 11 d of sensor installation parts are dented from the circumferential direction full length of the fitting surface 11a by the side of the axis | shaft 2, and the interposition range of the sensor 12 has the circumferential direction length more than the fitting surface 11a. For this reason, the sensor 12 and the sensor installation portion 11d support the fitting surface 1b of the inner ring 1 together with the fitting surface 11a on the shaft 2 side, and there is no substantial reduction in the fitting area as compared with the conventional adapter sleeve. Like the adapter sleeve, the roundness of the raceway surface 1a can be prevented from being lost.

  Since the sleeve 11 has the slit 11c, the circumferential length of the sensor 12 can be made longer than the sensor installation portion 11d. If the sensor 12 and the sensor installation part 11d have exactly the same length, it is troublesome to obtain these dimensional accuracy, and it is difficult to fit the sensor 12 into the sensor installation part 11d. Since the protruding portion of the sensor 12 cannot accurately give the surface pressure of the fitting surface, it is not suitable for the pressure conversion function portion 12a.

  Since the sensor 12 of the end ring-shaped body can be elastically expanded to both sides in the circumferential direction like a C-shaped concentric retaining ring to increase the inner diameter, it can be easily installed in the sensor installation portion 11d. When the sensor 12 is fitted into the sensor installation portion 11d, the sensor installation portion 11d is grooved, so that the sensor 12 can be positioned in the axial direction and the radial direction. When it is desired to obtain a strong positioning, it is possible to add screwing of the sensor 12 to the sleeve 11, adhesion, or the like.

  With the sensor 12 attached to the sensor installation part 11d, the pressure conversion function part 12a is positioned on the same plane as the conical surface that defines the fitting surface 11a on the shaft 2 side. For this reason, when the inner ring 1 is fitted to the sleeve 11 after the sensor 12 is attached to the sensor installation portion 11d, the sensor 12 can be interposed between the fitting surface 1b of the inner ring 1 and the sensor installation portion 11d. Even if the fitting positions of the inner ring 1 and the fitting surfaces 1b and 11a on the shaft 2 side are moved relative to each other in the axial direction in the interposed state, the pressure conversion function part 12a and the fitting surface 1b of the inner ring 1 at the interposed part of the sensor 12 Contact is maintained. For this reason, the surface pressure of the fitting surface can be applied to the sensor 12.

  What is necessary is just to provide the pressure conversion function part 12a and the fitting surface 1b of the inner ring | wheel 1 in the relationship which maintains a fixed contact state in the whole range of the range in which a relative movement is possible. If provided in this relationship, the confirmation work that the fitting position of the fitting surfaces 1b, 11a on the inner ring 1 and the shaft 2 side is in the neutral fitting position can be omitted, and the pressure conversion function part 12a is formed. This is because the contact state between the pressure-sensitive surface and the fitting surface 1b of the inner ring 1 can be kept constant during relative movement, and the surface pressure of the fitting surface can be continuously applied. In the illustrated example, the pressure conversion function unit 12a is in contact with a position closer to the other end side than the maximum relative movement amount Δl from one end of the fitting surface 1b of the inner ring 1 in the neutral fitting position. It has become.

  The sensor installation portion 11d is provided so as to be off the radial plane that intersects the raceway surface 1a of the inner ring 1. The illustrated example illustrates a state in which the fitting position of the fitting surfaces 1b and 11a on the inner ring 1 and the shaft 2 side is in the neutral fitting position. When the sensor installation portion 11d is considered based on the state of being in the neutral fitting position, the axial section divided by the radial plane Pr1 including one end of the raceway surface 1a and the radial plane Pr2 including the other end of the raceway surface 1a. It is not located in the axial direction range defined by the radial plane Pr3 including one end of the track surface 1a in the other row and the radial plane Pr4 including the other end of the track surface 1a in the other row. Since the sleeve 11 is an adapter sleeve, even if the inner ring 1 is tightened with the nut 3 from this state, the inner ring 1 is moved toward the large-diameter end of the fitting surface 11a on the shaft 2 side while the interference of the inner ring 1 is increased. Will be pushed in the axial direction. Accordingly, the inner ring 1 is relatively moved away from the sensor 12 between the fitting surface 11a on the shaft 2 side and the external thread 11b. Even if the inner ring 1 is adjusted to any interference or internal clearance, The sensor installation part 11d deviates from the radial plane that intersects the track surface 1a. For this reason, since the fitting area | region by the fitting surfaces 1b and 11a is ensured inside the raceway surface 1a of the inner ring | wheel 1, collapse of the bus-line shape of the raceway surface 1a can be prevented similarly to the conventional adapter sleeve.

  When the sensor installation portion 11d is to be positioned near the center of the width of the double row inner ring 1 or near the inner diameter large diameter end of the inner ring 1, the maximum relative movement amount Δl from the neutral fitting position described above is anticipated. To determine the position. That is, in the case of the vicinity of the center of the width of the double-row inner ring 1, it can be positioned within the range defined by the radial plane Pr5 and the radial plane Pr3 that are separated from the radial plane Pr2 by Δl. When the inner ring 1 is located near the inner diameter large diameter end, the inner ring 1 can be positioned closer to the larger diameter end than the radial plane Pr6 separated from the radial plane Pr4 by Δl.

  Since the sensor installation part 11d is recessed between the fitting surface 11a on the shaft 2 side and the external thread 11b, and the sensor 12 is accommodated in the sensor installation part 11d, the nut 3 and the sensor 12 do not contact each other. Therefore, as in the prior art, the side surface of the inner ring 1 can be pushed in a well-balanced manner with the nut 3 over the entire circumference, and there is no fear that the inner ring 1 is inclined.

  Before the inner ring 1 is fitted to the sleeve 11, the wiring 12 c of the sensor 12 can be connected to the calculator 13 through the slit 11 c to the side of the sleeve 11. Since the wiring 12c is led out from the inside of the inner ring 1 and the nut 3 to the arithmetic unit 13, the wiring 12c does not get in the way while being relatively moved by the nut 3, and the nut 3 can be turned with a spanner. The wiring 12c may be led to the opposite side to the illustrated example.

  The calculator 13 converts the surface pressure of the fitting surface into a parameter for determining the relative position in real-time calculation processing using the output of the pressure conversion function unit 12a of the sensor 12. Interference and internal clearance of the inner ring 1 can be obtained as parameters for determining the relative position, and one or both of output and display can be selectively set by operating the input operation unit 13a. It has become.

  As shown in FIG. 1A, the arithmetic unit 13 includes an information processing unit (MPU) 13b that executes program processing, various processing programs, already input information for arithmetic processing, and the like in addition to the input operation unit 13a. Storage unit 13c, an output display unit 13d for calculation results, an interface for connection with the pressure conversion function unit 12a, and the like.

  A relational expression based on the correlation between the surface pressure of the fitting surface and the interference of the inner ring 1, and other relational physical quantities included in the relational expression and a processing program for calculating the relational expression are stored in the storage unit 13c in advance. Can be held as.

  For example, for steel solid shafts and inner rings, the surface pressure of the fitting surface is a formula using measured values of bearing inner diameter (inner ring inner diameter), inner ring average groove diameter, inner ring interference (effective interference), and elastic modulus. (For example, page A-103 of NTN catalog CAT. No. 2202 / J, 17.5 of 104).

  Among the physical quantities included in the above-described well-known equations, values of other related physical quantities such as the bearing inner surface pressure excluding the contact pressure of the fitting surface and the inner ring interference can be measured in advance.

  The information processing device 13b can obtain the measured value of the surface pressure of the fitting surface from the received signal of the pressure conversion function unit 12a. Of course, the correlation between the signal and the surface pressure value is known as in the general sensor measurement technique for the solid surface pressure, and it is a matter of course that the arithmetic processing program and necessary data are held in the storage unit 13c.

  Based on the above-mentioned well-known formula, the measured value of the bearing inner diameter and the like, and the measured value of the contact pressure of the fitting surface, which is a fluctuating physical quantity, the above-described relational expression for obtaining the interference of the inner ring 1 as a solution can be configured. . If the calculation of the relational expression is performed by the information processing device 13b, the interference (effective interference) of the inner ring 1 actually generated can be obtained and the output value can be displayed on the output display unit 13d.

  A relational expression based on the correlation between the interference of the inner ring 1 and the internal clearance, and other relational physical quantities included in the relational expression and a processing program for calculating the relational expression are stored in advance in the storage unit 13c as already input information. Can be retained.

  For example, a relational expression that defines the correlation between the interference of the inner ring 1 and the internal clearance has been conventionally used in the management of the internal clearance and is well known. The amount of decrease in the internal clearance due to the interference of the inner ring 1 varies depending on the type of bearing, the shape, size, and material of the shaft and inner ring. Approximately, it is managed as a value of 70% to 90% of the interference (effective interference) of the inner ring 1 actually generated. When this percentage value is obtained more finely, it is assumed that the dimensional tolerance follows a normal distribution in consideration of the size, shape, material, etc. of each part, and is generally calculated by 3σ. Therefore, the above-described% value corresponding to the specifications of the inner ring 1 and the shaft 2 can be obtained in advance and appropriately used as already-input information.

  Internal clearance (measured internal clearance) obtained from the measured dimensions of each part when the measured load is applied to the tapered bore bearing with a testing machine, and internal clearance (theoretical internal clearance) obtained by subtracting the elastic deformation due to the measured load from the measured internal clearance The value of can be obtained in advance. The values of the measured internal clearance and the theoretical internal clearance can be used as input information as appropriate according to the specifications of the inner ring 1 and the shaft 2.

  The amount of decrease in the internal clearance due to the interference of the inner ring 1 that has actually occurred can be obtained by multiplying the value of the interference of the inner ring 1 obtained by the arithmetic processing by the above-described% value. By subtracting the amount of decrease in internal clearance from the measured internal clearance or theoretical internal clearance, the actual internal clearance (residual clearance) can be obtained. Therefore, it is possible to construct a relational expression for obtaining the internal clearance actually generated as a solution based on the interference of the inner ring 1 obtained by the arithmetic processing, the reduction amount of the internal clearance, the measured internal clearance, or the theoretical internal clearance. it can. When the calculation of the relational expression is performed by the information processing device 13b, the actually generated internal clearance (residual clearance) can be obtained and the output value can be displayed on the output display unit 13d.

  The calculation process for obtaining the interference and the internal clearance of the inner ring 1 and the display of the output value may be repeatedly executed within a range that does not hinder the determination of the relative position. These execution intervals can be fixed to the calculator 13 or an execution interval setting function can be added to the calculator 13.

  As described above, the bearing mounting assist device is configured to fit the inner ring 1 and the fitting surfaces 1b and 11a on the shaft 2 side with the sensor 12 interposed between the fitting surface 1b of the inner ring 1 and the sensor installation portion 11d. By tightening the position with the nut 3 and relatively moving in the axial direction, the interference of the inner ring 1 can be increased. Prior to the start of tightening of the nut 3, it is possible to set in advance the interference or / and the internal clearance of the inner ring 1 as a variation parameter for determining the relative position from the input operation unit 13a.

  When the interference of the inner ring 1 occurs at the start of the relative movement, regardless of whether or not it is in the neutral fitting position, the surface pressure of the fitting surface 1b of the inner ring 1 and the fitting surface 11a on the shaft 2 side increases. The sensor 12 interposed between the fitting surface 1b of the inner ring 1 and the sensor installation portion 11d is pressed by the fitting surface 1b of the inner ring 1. Since the load applied to the sensor 12 is received by the inner wall surface of the sensor installation unit 11d, the pressing force is applied to the pressure conversion function unit 12a as the surface pressure of the fitting surface, and a signal is generated. The calculator 13 receives the signal via the wiring 12c, and repeatedly performs calculation processing and display for obtaining the set variation parameter. For this reason, the operator can determine whether to continue or stop tightening the nut 3 while checking the variation parameter, and can fix the relative axial positions of the fitting surfaces 1b and 11a on the inner ring 1 and the shaft 2 side. . That is, the interference of the inner ring 1 and the internal clearance can be managed at appropriate values, and creep of the inner ring 1 and damage to the raceway surface 1a can be prevented.

  The surface pressure of the fitting surface is determined by the actually generated interference of the inner ring, regardless of whether or not the residual stress non-uniformity is affected. For this reason, this bearing mounting auxiliary device can more accurately determine the interference of the inner ring 1 and more accurately determine the internal clearance from the determined interference of the inner ring 1.

  Further, in this bearing mounting auxiliary device, since the sensor installation portion 11d is provided on the sleeve 11 on the shaft 2 side, the inner ring 1 is a conventional product, as compared with the case where the sensor installation portion is provided on the fitting surface 1b of the inner ring 1. Thus, the strength reduction of the inner ring 1 can be avoided, and the elastomechanical calculation of the interference-fitting surface pressure and the interference-internal clearance reduction amount due to the complicated shape of the inner ring 1 can be applied as it is.

  In addition, since this bearing mounting auxiliary device is formed with the sensor installation portion 11d on the sleeve 11, it is not necessary to form recesses in the inner ring 1 and the shaft 2, and it is possible to avoid a decrease in the strength of these and the rolling that is already in use. The bearings and shafts can be used without any changes.

  In addition, since this bearing mounting auxiliary device employs the sleeve 11 formed with the axial cut 11c, the fitting operation to the shaft 2 is facilitated, and a general-purpose conventional adapter sleeve or the like is used. The sleeve 11 can be obtained.

  Further, in this bearing mounting auxiliary device, since the wiring 12c of the sensor 12 is led out from the inner side of the inner ring 1 through the slit 11c of the sleeve 11, there is no need to form a dedicated groove or space in the sleeve 11 or the shaft 2. The wiring 12c does not get in the way when the inner ring 1 and the sleeve 11 are relatively moved.

  In addition, this bearing mounting auxiliary device is formed with the fitting surface 11a on the shaft 2 side on the outer diameter surface of the sleeve 11, the male screw 11b, and the sensor installation portion 11d between the fitting surface 11a and the male screw 11b. The sensor installation portion 11d is formed in a series of turning steps necessary to form the screw 11b, and the sensor installation portion 11d is efficiently formed by utilizing the screw stealing space essential for forming the male screw 11b. Can do.

  Further, in this bearing mounting auxiliary device, the sensor installation portion 11d is provided so as to be off the radial plane intersecting the raceway surface 1a of the inner ring 1, so that the inner ring 1 and the shaft 2 are fitted on the inner side of the raceway surface 1a. Area can be secured. Even if a space is generated between the sensor installation portion 11d and the fitting surface 1b of the inner ring 1, it is possible to prevent the deformation of the bus bar shape of the raceway surface 1a of the inner ring 1 due to the space as in the conventional case. .

  Further, in this bearing mounting auxiliary device, since the sensor 12 is provided so as to cover the entire length in the circumferential direction of the sensor installation portion 11d, a space having a circumferential length is provided between the sensor 12 and the inner wall surface of the sensor installation portion 11d. It does not occur, and the roundness on the raceway surface 1a can be ensured as in the conventional case.

  Further, in this bearing mounting auxiliary device, since the sensor 12 is an end ring-shaped body and is fitted into the sensor installation portion 11d, the sensor 12 can be easily installed on the sensor installation portion 11d like a C-shaped retaining ring. it can.

  Further, in this bearing mounting auxiliary device, since the sensor installation portion 11d that is recessed between the screw 11b and the fitting surface 11a on the shaft 2 side is formed on the outer diameter surface of the sleeve 11, the sensor installation portion 11d using screw stealing is provided. It is easy to remove from the radial plane including the raceway surface 1a of the inner ring 1, and the groove-shaped sensor installation portion 11d into which the sensor 12 of the end annular body is fitted can be formed by using the turning process of the external thread 11b. It is suitable for being able to do.

  In addition, this invention is not limited to embodiment, As long as the subject can be achieved, it can be variously changed. The specific configuration of each part of the bearing attachment assisting device can be appropriately combined and employed as long as each specific configuration exhibits the intended effect.

  For example, a shaft-side fitting surface, a male screw, and a sensor installation portion can be formed on the outer diameter surface of the shaft. Further, the sensor installation portion can be formed on the inner diameter surface of the inner ring, and the pressure conversion function portion of the sensor can be changed so as to contact the shaft-side fitting surface.

  In addition, the sensor converts the strain into a strained body having an applied point that contacts the fitting surface of the inner ring, converts the strain into an electrical signal with a strain gauge, and determines the pressure based on the pressure-strain-electric signal correlation. A load cell for obtaining a value can also be used.

  This bearing mounting auxiliary device is not limited to the self-aligning roller bearing as shown in the figure, but includes various types such as non-aligning bearings, single row bearings, double row bearings, ball bearings, roller bearings, open bearings, seal bearings, etc. Applicable to any type of bearing installation.

a is a longitudinal sectional front view of the bearing mounting auxiliary device according to the embodiment cut along an axial plane including the center of the cut width of the sleeve, and b is an enlarged cross-sectional view of the sensor installation portion of the a. 1 is a perspective view of the sleeve and sensor of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Inner ring 1a Raceway surface 1b Fitting surface 2 Shaft 3 Nut 4 Washer 11 Sleeve 11a Fitting surface 11b Male thread 11c Cutting 11d Sensor installation part 12 Sensor 12a Pressure conversion function part 12b Mounting part 12c Wiring 13 Calculator 13a Input operation part 13b Information Processing device 13c Storage unit 13d Output display unit

Claims (9)

  While increasing the interference of the inner ring by relatively moving the fitting position of the inner ring of the tapered hole and the fitting surface on the shaft side in the axial direction, the fluctuation physical quantity correlated with the fluctuation parameter for determining the relative position is converted into a signal by the sensor. In the bearing mounting auxiliary device that converts and calculates the variable parameter by the calculation process using the measured value of the variable physical quantity obtained from the signal and the already-input information, the inner ring and the fitting surface on the shaft side are recessed from one side. A sensor installation portion, and the relative movement is possible with the sensor interposed between the inner ring and the other side of the fitting surface on the shaft side and the sensor installation portion, and the sensor is used as the variable physical quantity. A bearing mounting auxiliary device characterized by converting a surface pressure of a fitting surface.   2. The bearing mounting auxiliary device according to claim 1, wherein the sensor installation portion is recessed from the fitting surface on the shaft side toward the shaft center side.   The bearing mounting auxiliary device according to claim 2, wherein the sensor installation portion is formed on an outer diameter surface of a sleeve fitted to the inner ring and the shaft.   4. The bearing mounting auxiliary device according to claim 3, wherein the sleeve is formed with an axial cut, and the wiring of the sensor is led out from the inside of the inner ring through the sleeve.   A male screw for a nut and a sensor installation portion recessed between the fitting surface on the shaft side and the male screw are formed on the outer diameter surface on the shaft side having the fitting surface on the shaft side. The bearing mounting auxiliary device according to any one of claims 2 to 4, characterized in that:   6. The bearing mounting auxiliary device according to claim 1, wherein the sensor installation portion is provided so as to be separated from a radial plane intersecting with the raceway surface of the inner ring.   The bearing attachment auxiliary device according to any one of claims 1 to 6, wherein the sensor is provided so as to extend over the entire circumferential length of the sensor installation portion.   The bearing mounting according to any one of claims 1 to 7, wherein the sensor is an end ring-shaped body having a slit in an axial direction, and is provided so as to be fitted into the sensor installation portion. Auxiliary device.   A screw is formed on an outer diameter surface on the shaft side having a fitting surface on the shaft side, and the sensor installation portion is formed between the male screw and the fitting surface on the shaft side. The bearing mounting auxiliary device according to claim 6 or 8.

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