JP4744257B2 - Dimension management method for bearing bracket and dimensional management program for bearing bracket - Google Patents

Description

  The present invention relates to a bearing bracket dimension management method and a bearing bracket dimension management program for managing a dimension between a bearing and a bearing holding hole of a bearing bracket that holds the bearing by fitting.

  For example, in a circulation pump or the like used in a thermal power plant, a structure in which a rotating shaft is rotatably supported by a bearing is frequently used. As an example, the bearing is fitted and held in a bearing holding hole formed in the bearing bracket.

  Taking a bearing used for a circulation pump used in a thermal power plant as an example, the bearing and the bearing bracket are subject to periodic inspection, and are disassembled and inspected, for example, every two years. In many cases, bearings are replaced with new ones at regular inspections. On the other hand, since the bearing holding hole of the bearing bracket is inevitably worn due to the structure in which the bearing is held by fitting, repair is required if the wear amount exceeds a certain standard.

  Here, since the bearing and the bearing holding hole of the bearing bracket are fitted, the assembly cannot be performed unless the outer diameter of the bearing is smaller than the inner diameter of the bearing holding hole. Therefore, as the dimensional tolerance of the bearing and the bearing holding hole, the outer diameter of the bearing is set to a minus tolerance, and the inner diameter of the bearing holding hole is set to a plus tolerance. Therefore, during periodic inspections, the inner diameter of the bearing holding hole is measured, the tolerance of the inner diameter of the bearing holding hole is set as the maximum allowable dimension, and if the measured value of the inner diameter of the bearing holding hole exceeds the maximum allowable dimension, repair is required. It is determined that Regarding the outer diameter of the bearing, the tolerance is the minimum allowable dimension. However, if the operation is to replace the bearing at every periodic inspection, check whether the outer diameter of the bearing exceeds the minimum allowable dimension. Is no longer necessary. In addition, as a fitting standard such as the relationship between the bearing and the bearing holding hole, for example, JIS B 0401 is defined in the Japanese Industrial Standard.

Japanese Patent Laid-Open No. 05-164656 Japanese Patent Application Laid-Open No. 07-103745 JP 2001-323893 A

  The diameter of the tolerance 0 in the bearing holding hole of the bearing and the bearing bracket is a nominal diameter. Both tolerances of the bearing and the bearing holding hole are recognized as error values from the nominal diameter. Due to the nature of such tolerances, the maximum allowable dimension which is the tolerance of the inner diameter of the bearing holding hole and the minimum allowable dimension which is the tolerance of the outer diameter of the bearing are related to each other. That is, when the maximum allowable dimension is considered as a reference, the bearing bracket can be used until the inner diameter of the bearing holding hole exceeds the maximum allowable dimension even if the outer diameter of the bearing is reduced to the minimum allowable dimension. On the other hand, when considering the minimum allowable dimension as a reference, the bearing can be used until the outer diameter of the bearing exceeds the minimum allowable dimension even if the inner diameter of the bearing holding hole increases to the maximum allowable dimension.

  Considering this, if the operation at the thermal power plant mentioned above, in which the bearing is replaced with a new one during periodic inspection, is adopted, the measured value of the inner diameter of the bearing holding hole exceeds the maximum allowable dimension. It is not possible to correctly determine whether or not the bearing holding hole needs to be repaired by simply determining whether or not it is necessary. For example, if the outer diameter of the bearing after replacement is close to the nominal diameter, even if the measured value of the inner diameter of the bearing holding hole exceeds the maximum allowable dimension, the urgency of repairing the bearing holding hole is very low, often It is not uncommon for repairs to be unnecessary until the next periodic inspection. Therefore, when determining whether or not the bearing holding hole needs to be repaired only by the determination method of whether or not the measured value of the inner diameter of the bearing holding hole exceeds the maximum allowable dimension, the bearing holding hole is forced to be repaired wastefully. There is a problem that such a situation can occur.

  The inventors of this application tried to solve the above problem and conducted a patent search. As a result, Patent Literatures 1 to 3 were found. However, the techniques described in Patent Documents 1 to 3 do not relate to a fitting structure between a bearing and a bearing holding hole of a bearing bracket that holds the bearing by fitting. In addition, only the estimation (Patent Document 1), the prediction (Patent Document 2), and the detection (Patent Document 3) of the wear amount of the wear determination target object are disclosed, and the bearing holding hole is forced to be repaired. It is not a content that suggests any solution to the above problem that a situation may occur.

  An object of the present invention is to provide a bearing bracket dimension management method and a bearing bracket dimension management program that can contribute to a correct determination as to whether or not the bearing holding hole needs to be repaired.

The dimension management method of the bearing bracket of the present invention includes a step of obtaining an outer diameter dimension error which is a difference value with respect to an outer diameter reference dimension which is zero tolerance of the bearing from a measured value of the outer diameter dimension of the bearing, and fitting the bearing. A step of obtaining an inner diameter dimensional error which is a difference value with respect to an inner diameter reference dimension which is zero tolerance of the bearing holding hole from a measured value of the inner diameter dimension of the bearing holding hole of the bearing bracket to be held together; With the difference between the maximum allowable dimension and the minimum allowable dimension of the outer diameter of the bearing as a reference value, the difference between the inner diameter dimension error and the outer diameter dimension error is smaller than the reference value and within the allowable range and large. And providing a value evaluation that the value is outside the allowable range.

The size management program for a bearing bracket according to the present invention is interpreted and executed by a computer, and the tolerance of a bearing holding hole of a bearing bracket that holds the bearing in a fitted state is fitted to the computer with the outer diameter reference dimension being zero tolerance. A function that allows an input of a nominal diameter that is an inner diameter reference dimension that is 0, a function that allows an input of an outer diameter dimension of the bearing that is a measured value, and an input of an inner diameter dimension of the bearing holding hole that is a measured value An allowable function, a function of obtaining an outer diameter error that is a difference value of an input value of the outer diameter of the bearing with respect to an input value of the nominal diameter, and an inner diameter of the bearing holding hole with respect to the input value of the nominal diameter. Corresponding a function for obtaining an inner diameter dimensional error which is a difference value of an input value, a minimum allowable outer diameter of the bearing and a maximum allowable inner diameter of the bearing holding hole which are different depending on the nominal diameter. A function for defining the size of each nominal diameter, referring to a definition file stored in a memory resource accessible by the computer, and calling the corresponding minimum allowable dimension and maximum allowable dimension based on the input value of the nominal diameter And a function for calculating a difference between the called maximum allowable dimension and the minimum allowable dimension as a reference value, and whether a difference between the inner diameter dimension error and the outer diameter dimension error is smaller or larger than the reference value. A value evaluation that the determination function and the difference between the inner diameter dimensional error and the outer diameter dimensional error are smaller than the reference value and within the allowable range and large are out of the allowable range, and the value evaluation And a function of asserting to the outside via the computer interface.

Another aspect of the bearing bracket dimensional management program of the present invention viewed from another aspect is interpreted and executed by a computer, and the computer retains the outer diameter reference dimension, which is a tolerance of the bearing of 0, and the bearing by fitting. The function of permitting the input of the nominal diameter, which is the inner diameter reference dimension that has zero tolerance of the bearing holding hole, the function of permitting the input of the outer diameter dimension of the bearing that is the measured value, and the bearing retaining hole that is the measured value A function of allowing the input of the inner diameter of the bearing, a function of obtaining an outer diameter dimension error which is a difference value of the input value of the outer diameter of the bearing with respect to the input value of the nominal diameter, and the bearing with respect to the input value of the nominal diameter A function to obtain an inner diameter dimensional error which is a difference value between the input values of the inner diameter dimensions of the holding hole, and a maximum allowable dimension of the inner diameter of the bearing holding hole and a minimum allowable dimension of the outer diameter of the bearing which are different depending on the dimension of the nominal diameter. A function for calling the corresponding reference value based on the input value of the nominal diameter by referring to a definition file stored in a memory resource accessible by the computer, defining the difference between the nominal diameter as a reference value And a function for determining whether a difference between the inner diameter dimension error and the outer diameter dimension error is smaller or larger than the called reference value, and a difference between the inner diameter dimension error and the outer diameter dimension error is the reference A value evaluation that the value is smaller than the value is within the allowable range and that the value is greater than the allowable range is given, and the value evaluation is asserted to the outside through the computer interface.

  According to the present invention, the difference between the maximum allowable dimension of the inner diameter of the bearing holding hole and the minimum allowable dimension of the outer diameter of the bearing is used as a reference value. The difference between the outer diameter dimension error, which is the difference value with respect to the outer diameter reference dimension, is compared with the reference value, and the value is evaluated to determine whether it is within the allowable range. Is it really necessary to repair the bearing holding hole? Therefore, it is possible to reliably prevent the bearing holding hole from being forced to be repaired.

  An embodiment of the present invention will be described with reference to FIGS.

(Dimension management object)
FIG. 1 is a longitudinal side view of an electric motor. The electric motor 1 of the present embodiment stores and holds the stator 5 and the rotor 7 in the main frame 3. The main frame 3 has a cylindrical shape with both ends opened, and a pair of bearing brackets 9 are fixed to the both ends opened. The stator 5 is fixed to the inner peripheral surface of the main frame 3, and the rotor 7 is rotatably supported by the bearing bracket 9.

  A support structure of the rotor 7 will be described. A pair of bearing brackets 9 that closes both open ends of the main frame 3 are shrink-fitted into the bearing bracket through holes 13 through which the rotating shaft 11 of the rotor 7 is inserted in a non-contact state and the rotating shaft 11 of the rotor 7. And a bearing holding hole 17 for holding the bearing 15. The bearing holding hole 17 is formed to have a larger diameter than the bearing bracket through hole 13. The bearing 15 has a configuration in which an outer ring and an inner ring are rotatably combined. The inner ring side is shrink-fitted on the rotary shaft 11 and the outer ring side is fitted and held in the bearing holding hole 17. Yes. Thereby, the rotor 7 is rotatably supported by the bearing bracket 9.

  In the electric motor 1 of the present embodiment, a cooling fan 19 is attached to the rotating shaft 11 of the rotor 7. Therefore, the cooling fan 19 is configured to rotate when the rotating shaft 11 rotates. The cooling fan 19 is covered with a fan cover 21.

  FIG. 2 is a schematic diagram for explaining the clearance management between the bearing 15 and the bearing bracket 9. The bearing 15 is held in the bearing holding hole 17 by a fitting structure. That is, the bearing 15 is held by the bearing bracket 9 without being rotated by fitting the bearing 15 into the bearing holding hole 17. Due to the fitting structure between the bearing 15 and the bearing holding hole 17, the outer diameter of the bearing 15 is set as a negative tolerance and the inner diameter of the bearing holding hole 17 is set as a positive tolerance as the dimensional tolerance of the bearing 15 and the bearing holding hole 17. Will be. Moreover, as shown in FIG. 2, the diameter of the tolerance 0 in the bearing 15 and the bearing holding hole 17 is a nominal diameter. Any tolerance of the bearing 15 and the bearing holding hole 17 is recognized as an error value from the nominal diameter.

(Dimension management method)
In the present embodiment, as a dimension management method of the bearing bracket 9, it is evaluated whether or not the inner diameter dimension of the bearing holding hole 17 is within an allowable range.

  In evaluating whether or not the inner diameter dimension of the bearing holding hole 17 is within the allowable range, conventionally, the inner diameter dimension of the bearing holding hole 17 is measured and it is determined only whether or not the measured value is within the tolerance range. For example, as shown in Table 1, when the upper limit value of the inner diameter dimension tolerance of the bearing holding hole 17 is 25 μm, the allowable range unless the measured inner diameter dimension of the bearing holding hole 17 exceeds the upper limit value of 25 μm of the tolerance. It was determined that it was out of the allowable range if it was within. In this case, since the bearing holding hole 17 is on the inner diameter side of the fitting structure, the lower limit value of the inner diameter dimension tolerance is always zero.

  In Table 1, the nominal diameter (mm) of the inner diameter of the bearing holding hole 17 or the outer diameter of the bearing 15 is defined because the upper limit value of the tolerance of the bearing holding hole 17 varies depending on the nominal diameter. . The upper limit of the inner diameter dimensional tolerance of the bearing holding hole 17 is 25 μm when the nominal diameter exceeds 120 mm and is 150 mm or less.

  As described above, as a fitting standard such as the relationship between the bearing and the bearing holding hole, for example, JIS B 0401 is defined in the Japanese Industrial Standard. The numerical values shown in Table 1 are examples in the case of the tolerance zone class H6 defined in JIS B 0401.

  In contrast to the conventional evaluation method for determining whether the inner diameter dimension of the bearing holding hole 17 is within the allowable range as described above, in the present embodiment, the bearing holding hole 17 is based on the relative relationship with the outer diameter dimension of the bearing 15. It is determined whether or not the inner diameter dimension is within an allowable range. That is, in the present embodiment, a difference value (outer diameter dimension error) with respect to the outer diameter reference dimension of the bearing 15 is obtained from the measured value of the outer diameter dimension of the bearing 15. Further, a difference value (inner diameter dimension error) with respect to the inner diameter reference dimension of the bearing holding hole 17 is obtained from the measured value of the inner diameter dimension of the bearing holding hole 17. The outer diameter reference dimension of the bearing 15 and the inner diameter reference dimension of the bearing holding hole 17 coincide with each other, and these are so-called nominal diameters. In the present embodiment, the difference between the inner diameter dimensional error and the outer diameter dimensional error thus determined is obtained. The value of this difference is the value of the gap between the outer diameter of the bearing 15 and the inner diameter of the bearing holding hole 17. Therefore, the difference value thus obtained is compared with a reference value. The reference value is a value of a difference between the maximum allowable dimension of the inner diameter of the bearing holding hole 17 and the minimum allowable dimension of the outer diameter of the bearing 15. As an example of the value of the maximum allowable dimension of the inner diameter of the bearing holding hole 17, the value of the inner diameter dimension tolerance of the bearing holding hole 17 can be used. As an example of the value of the minimum allowable dimension of the outer diameter of the bearing 15, the value of the outer diameter dimension tolerance of the bearing 15 can be used as an example. As a result, in the dimension management method of this embodiment, the value evaluation that the difference between the inner diameter dimension error and the outer diameter dimension error is within the allowable range when it is smaller than the reference value, and that it is outside the allowable range when it is large. give.

Table 2 shows the inner diameter dimension tolerance (A) of the bearing holding hole 17 and the outer diameter dimension tolerance of the bearing 15 (−) when the inner diameter of the bearing holding hole 17 or the nominal diameter of the outer diameter of the bearing 15 exceeds 120 mm and is 150 mm or less. B) is defined, and further, an allowable value (reference value) of the gap X between the bearing 15 and the bearing holding hole 17 is defined. As shown in Table 2, when the nominal diameter exceeds 120 mm and is 150 mm or less, the upper limit value (maximum allowable dimension) of the inner diameter dimension tolerance of the bearing holding hole 17 is 25 μm, and the outer diameter dimension tolerance of the bearing 15 is the minimum. The value (minimum allowable dimension) is -18 μm. Therefore, the reference value that is the difference between the maximum allowable dimension of the inner diameter of the bearing holding hole 17 and the minimum allowable dimension of the outer diameter of the bearing 15 is:
(25 μm) − (− 18 μm) = 43 μm
It turns out that. In this case, the lower limit value of the inner diameter dimension tolerance of the bearing holding hole 17, the upper limit value of the outer diameter dimension tolerance of the bearing 15, and the minimum value of the reference value are all zero.

  In Table 2, the minimum value (minimum allowable dimension) of the outer diameter dimensional tolerance of the bearing 15 exemplifies the case where the accuracy grade of the bearing 15 is 0 class according to Japanese Industrial Standard (JIS B 1514). In the Japanese Industrial Standard, five types of grades 0, 6, 5, 4, and 2 are specified as the accuracy grade of the bearing 15. The minimum value of the outer diameter dimension tolerance (minimum allowable dimension) of the bearing 15 varies depending on the accuracy grade of the bearing 15.

  The numerical values shown in Table 2 are examples in the case of the tolerance zone class H6 defined in JIS B 0401 defined in the Japanese Industrial Standard as a fitting standard such as the relationship between the bearing and the bearing holding hole. In the Japanese Industrial Standard, the tolerance class of JIS B 0401 is B10, C9, C10, D8, D9, D10, E7, E8, E9, F6, F7, F8, G6, G7, H6, H7, H8, H9, 19 types of H10 are defined. The minimum value of the outer diameter dimension tolerance (minimum allowable dimension) of the bearing 15 varies according to the tolerance class.

  As described above, according to the dimension management method of the present embodiment, the upper limit value (maximum allowable dimension) of the inner diameter dimension tolerance of the bearing holding hole 17 and the minimum value (minimum allowable dimension) of the outer diameter dimension tolerance of the bearing 15. The difference between the inner diameter dimensional error which is a difference value with respect to the inner diameter reference dimension of the bearing holding hole 17 and the outer diameter dimension error which is a difference value with respect to the outer diameter reference dimension of the bearing 15 is compared with the reference value. The value of whether it is within the allowable range was evaluated. By adopting such an evaluation method, it is possible to correctly determine whether or not the bearing holding hole 17 needs to be repaired. Therefore, it is ensured that the bearing holding hole 17 is forced to be repaired. Can be prevented.

(Dimension management program)
The dimension management method for the bearing bracket 9 is executed on a computer that interprets and executes a dimension management program for the bearing bracket 9. Therefore, in the following, such a dimension management program and a process executed by the computer after interpreting it will be described.

  FIG. 3 is a schematic diagram illustrating an example of a system configuration including a computer that interprets and executes a dimension management program. This system includes a server 101, a client PC 103, and a portable information terminal 105 as basic components. The server 101 and the client PC 103 can communicate with each other via the network 107. The portable information terminal 105 can communicate with the server 101 via a wireless communication station 109 connected to the network 107. As the portable information terminal 105, for example, a mobile phone, a notebook computer, a PDA (registered trademark), or the like can be used.

  The network 107 is constructed by a local communication network such as a LAN as an example. As another example, the network 107 may include an external communication network such as a general line or a dedicated line. In general, regardless of the form of the network 107, the client PC 103 or the portable information terminal 105 can exchange files with the server 101 under a predetermined access restriction. Alternatively, when the server 101 provides a site that can be browsed by a browser installed on the client PC 103 or the portable information terminal 105, the client PC 103 or the portable information terminal 105 provides the site by accessing the site. The content to be viewed can be browsed by the browser.

  The server 101, the client PC 103, and the portable information terminal 105 can all be computers that interpret and execute a dimension management program. In FIG. 3, (1) to (6) show a technique such as installation of a dimensional management program to the computer.

  The method (1) is a method for installing the dimension management program recorded on the CD-ROM 111 into the client PC 103. The dimension management program is generally installed in the HDD 201 (see FIG. 4) of the client PC 103, and when the dimension management program is started, the whole or a part thereof is transferred to the RAM 203 (see FIG. 4). The CPU 205 (see FIG. 4) accesses the RAM 203 for interpretation.

  The method (2) is a method of downloading and installing the dimension management program stored in the server 101 into the client PC 103. Similar to the method (1), the dimension management program is generally installed in the HDD 201 (see FIG. 4) of the client PC 103, and the whole or a part of the dimension management program is stored in the RAM 203 (FIG. 4) when the dimension management program is started. The CPU 205 (see FIG. 4) of the client PC 103 interprets and executes the access by accessing the RAM 203.

  The method (3) is a method in which the size management program stored in the server 101 is transmitted to the client PC 103 so that the client PC 103 interprets and executes it. This method typically uses a well-known JAVA script as a dimension management program (JAVA is a registered trademark). That is, as an example, the server 101 provides the client PC 103 with a site for managing the dimensions of the bearing bracket 9 that can be viewed with a browser installed on the client PC 103. When the client PC 103 accesses the site, the server 101 transmits a dimension management program to the client PC 103 via the network 107. The client PC 103 temporarily places the received dimension management program in the RAM 203 (see FIG. 4). The dimension management program temporarily stationed in the RAM 203 is interpreted and executed by the CPU 205 (see FIG. 4) of the client PC 103.

  The method (4) is a method of downloading and installing the dimension management program stored in the server 101 to the portable information terminal 105. The dimension management program is generally installed in the flash ROM 207 (see FIG. 4) of the portable information terminal 105, and the CPU 205 (see FIG. 4) of the client PC 103 accesses the flash ROM 207 when the dimension management program is activated. It is interpreted and executed.

  The method (5) is a method in which the size management program stored in the server 101 is transmitted to the portable information terminal 105 and is interpreted and executed by the client PC 103. Similar to the method (3), this method typically uses a well-known JAVA script as a dimension management program (JAVA is a registered trademark). That is, as an example, the server 101 provides the mobile information terminal 105 with a site for managing the dimensions of the bearing bracket 9 that can be viewed with a browser installed in the mobile information terminal 105. When the portable information terminal 105 accesses the site, the server 101 wirelessly transmits a size management program from the network 107 to the portable information terminal 105 via the wireless communication station 109. The portable information terminal 105 temporarily places the received dimension management program in the flash ROM 207 (see FIG. 4). The dimension management program temporarily stationed in the flash ROM 207 is interpreted and executed by the CPU 205 (see FIG. 4) of the portable information terminal 105.

  The method (6) is a method for installing the dimension management program recorded on the CD-ROM 111 into the server 101. The dimension management program is generally installed in the HDD 201 (see FIG. 4) of the client PC 103, and when the dimension management program is activated, the whole or a part thereof is transferred to the RAM 203 (see FIG. 4). The CPU 205 (see FIG. 4) accesses the RAM 203 for interpretation. The method (6) differs from the method (1) described above in that the information input and instruction necessary for executing the dimension management program are not executed by the operation input of the server 101 itself, but the client PC 103 or It is that it is executed by an operation input on the portable information terminal 105. Therefore, in the method (1), the user of the dimension management program is the operator of the client PC 103 in which the dimension management program is installed, whereas in the method (6), the dimension management program is used. The user is not an operator of the server 101 in which the dimension management program is installed, but an operator of the client PC 103 or the portable information terminal 105 that accesses the server 101. This is a significant difference between the method (1) and the method (6).

  For example, the server 101 provides the client PC 103 or the portable information terminal 105 with a site for size management of the bearing bracket 9 that can be browsed by a browser installed on the client PC 103 or the portable information terminal 105. This site is described in HTML or SGML as an example. The client PC 103 or the portable information terminal 105 can access the site and browse the content of the site. A site provided by such a server 101 transmits to the client PC 103 or the portable information terminal 105 an object that allows an operation on the client PC 103 or the portable information terminal 105. When the operator of the client PC 103 or the portable information terminal 105 operates the object, a command included in the object is executed, and the dimension management program installed in the server 101 is added to the hardware resource of the server 101 as the dimension management program. Causes the process to be executed.

  FIG. 4 is a block diagram showing a hardware configuration of a computer that interprets and executes the dimension management program. As described above, the server 101, the client PC 103, and the portable information terminal 105 can all be computers that interpret and execute the dimension management program. Since the server 101, the client PC 103, and the portable information terminal 105 have a certain degree of commonality as hardware configurations constituting the computer, in FIG. 4, they are common to those devices without being distinguished from each other. An example of a hardware configuration is shown. The above-described CPU 205 that executes various arithmetic processes to control each unit, the ROM 209 that stores data in a fixed manner, and the above-described RAM 203 that stores data in a rewritable manner and provides the work area to the CPU 205 are connected to the system bus 211. Connected to each other, and these constitute the core of the computer.

  The above-described HDD 201 is also connected to the CPU 205 via the system bus 211. The HDD 201 is used as a medium for installing a dimension management program. However, the HDD 201 is not provided in the portable information terminal 105 such as a mobile phone or a PDA, whereas the HDD 201 is provided almost without exception in the portable information terminal 105 such as the server 101, the client PC 103, and the notebook personal computer. . Instead, the portable information terminal 105 such as a mobile phone or a PDA is provided with a flash ROM 207 as a medium for installing the dimension management program. The flash ROM 207 is also connected to the CPU 205 via the system bus 211.

  The computer includes a CD-ROM driver 213 for reading the CD-ROM 111 in which a dimension management program is recorded. The CD-ROM driver 213 is also connected to the CPU 205 via the system bus 211. The CD-ROM driver 213 is based on the premise that the CD-ROM 111 is used as a medium for recording the dimension management program. When the medium for recording the dimension management program is another type of medium, the CD-ROM driver 213 is used as such a medium. A device capable of reading the recorded information will be provided. For example, when the medium for recording the dimension management program is a memory card, a memory card reader (not shown) is connected to the CPU 205 via the system bus 211. As the reading device of the medium for recording the size management program, an optimal device is appropriately selected according to the type of computer such as the server 101, the client PC 103, the portable information terminal 105, or the like.

  A display device 215, an input device 217, and a communication interface 219 are further connected to the CPU 205 via the system bus 211. For example, a liquid crystal display panel is used as the display device 215. The display device 215 functions as an interface between the computer and its operator. When the computer is the server 101 or the client PC 103, a CRT display or a plasma display is generally used as the display device 215. In particular, in the case of the portable information terminal 105, the display device 215 is required to have a size that can provide necessary information to the operator when executing the process according to the dimension management program.

  As the input device 217, a keyboard, a pointing device such as a mouse or a tracking ball, a touch panel, a numeric keypad, a four-way switch, or the like is used. These are appropriately selected according to the type of computer such as the server 101, client PC 103, portable information terminal 105, and the like. The communication interface 219 is provided to realize communication between the server 101 and the client PC 103 or between the server 101 and the portable information terminal 105. As the communication interface 219, a network card, a modem, or the like is used, and these are appropriately selected according to the type of the network 107.

  FIG. 5 is a schematic diagram showing a definition file. The definition file 301 sets the correspondence between the minimum allowable dimension of the outer diameter of the bearing 15 and the maximum allowable dimension of the inner diameter of the bearing holding hole 17 that is different for each of the inner diameters of the bearing holding holes 17 or the outer diameter of the bearings 15 as a nominal diameter. Define to correspond. In the definition file 301 of the present embodiment, the maximum value (upper limit) of the dimensional tolerance is used as the maximum allowable dimension of the inner diameter of the bearing holding hole 17. Further, the minimum value (lower limit) of the dimensional tolerance is used as the minimum allowable dimension of the outer diameter of the bearing 15. All units are μm. The maximum value (maximum allowable dimension) of the inner diameter dimensional tolerance of the bearing holding hole 17 and the minimum value (minimum allowable dimension) of the outer diameter dimensional tolerance of the bearing 15 differ depending on the size of the nominal diameter. Therefore, in the definition file 301 shown in FIG. 5, the maximum value of the inner diameter dimension tolerance (maximum allowable dimension) of the bearing holding hole 17 and the minimum value of the outer diameter dimension tolerance (minimum allowable dimension) of the bearing 15 for each nominal diameter dimension. Are defined in association with each other. In this case, a certain range is set for the size of the nominal diameter, for example, a range such as exceeding 6 mm and 10 mm or less, exceeding 10 mm and 18 mm or less, and the like, and the same numerical value is defined in each range.

  Here, FIG. 5 (a) shows that the bearing holding hole 17 is a tolerance zone class H6 defined by JIS B 0401 of Japanese Industrial Standards, and the bearing 15 is an accuracy grade 0 class defined by JIS B 1514 of Japanese Industrial Standards. 5B shows a definition file 301 in the case of FIG. 5B. FIG. 5B shows a bearing holding hole 17 defined by a Japanese Industrial Standard JIS B 0401 tolerance zone class H6, and a bearing 15 defined by a Japanese Industrial Standard JIS B 1514. The definition file 301 in the case of the obtained accuracy grade 6 is shown. The definition file 301 includes the tolerance zone classes (B10, C9, C10, D8, D9, D10, E7, E8, E9, F6, F7, F8, G6, G7, H6, H7, H8, H9, All or part of H10) and all or part of the accuracy grade (0 grade, 6 grade, 5 grade, 4 grade, 2 grade) of the bearing 15 are defined. The tolerance zone class of the bearing holding hole 17 and the accuracy grade of the bearing 15 included in the definition file 301 are appropriately determined as necessary.

  FIG. 6 is a schematic diagram showing another definition file. The definition file 301 shown in FIG. 6 defines a reference value obtained from the minimum allowable dimension of the outer diameter of the bearing 15 and the maximum allowable dimension of the inner diameter of the bearing holding hole 17 in correspondence with the nominal diameter. The reference value is the difference between the maximum allowable dimension of the inner diameter of the bearing holding hole 17 and the minimum allowable dimension of the outer diameter of the bearing 15. Similar to the definition file 301 shown in FIG. 5, the definition file 301 shown in FIG. 6 uses the maximum value of the dimensional tolerance as the maximum allowable dimension of the inner diameter of the bearing holding hole 17 that is the basis of the reference value. Further, the minimum value of the dimensional tolerance is used as the minimum allowable dimension of the outer diameter of the bearing 15. All units are μm. As described above, the maximum value of the inner diameter dimension tolerance (maximum allowable dimension) of the bearing holding hole 17 and the minimum value of the outer diameter dimension tolerance (minimum allowable dimension) of the bearing 15 differ depending on the size of the nominal diameter. The reference value also differs depending on the size of the nominal diameter. Therefore, the definition file 301 shown in FIG. 6 also defines a reference value for each size of the nominal diameter. In this case, a certain range is set for the size of the nominal diameter, for example, a range such as exceeding 6 mm and 10 mm or less, exceeding 10 mm and 18 mm or less, and the like, and the same numerical value is defined in each range.

  Here, FIG. 6 (a) shows that the bearing holding hole 17 is a tolerance zone class H6 defined by Japanese Industrial Standard JIS B 0401, and the bearing 15 is an accuracy class 0 grade defined by Japanese Industrial Standard JIS B 1514. 6B shows the definition file 301 in the case of FIG. 6B, and FIG. 6B shows the bearing holding hole 17 in the tolerance zone class H6 defined in JIS B 0401 of the Japanese Industrial Standard, and the bearing 15 defined in JIS B 1514 of the Japanese Industrial Standard. The definition file 301 in the case of the obtained accuracy grade 6 is shown. The definition file 301 includes the tolerance zone classes (B10, C9, C10, D8, D9, D10, E7, E8, E9, F6, F7, F8, G6, G7, H6, H7, H8, H9, A plurality of combinations are defined for the combination of H10) and the accuracy grade (0 grade, 6 grade, 5 grade, 4 grade, 2 grade) of the bearing 15. A combination of the tolerance zone class of the bearing holding hole 17 included in the definition file 301 and the accuracy grade of the bearing 15 is appropriately determined as necessary.

  The definition file 301 shown in FIG. 5 or FIG. 6 described above is stored in the memory resource of the computer. As memory resources, for example, HDD 201, RAM 203, flash ROM 207, ROM 209, etc. are appropriately assigned. What is important here is that the dimension management program causes the CPU 205 to access the definition file 301 in the course of processing according to the dimension management program by the CPU 205, whereas the definition file 301 This means that the hardware resources (for example, the server 101, the client PC 103, and the portable information terminal 105) having the CPU 205 that executes processing according to the program for use need not be stored in its own memory resources. For example, if the hardware resource having the CPU 205 that executes processing according to the dimension management program is the server 101, the definition file 301 is not necessarily stored in the HDD 201, RAM 203, flash ROM 207, or ROM 209 of the server 101. It is not necessary to be stored in an external storage device or the like.

  A computer that executes processing according to the size management program for the bearing bracket 9 does not need to refer to both of the definition files 301 shown in FIG. 5 or FIG. 6 when executing the processing. By referring to only one of the definition files 301, it is possible to execute processing according to the dimension management program.

  FIG. 7 is a flowchart showing the flow of processing executed by the computer in accordance with the dimension management program for the bearing bracket 9. The computer in this case is any one of the server 101, the client PC 103, and the portable information terminal 105, and the dimensional management program is installed by one of the methods (1) to (6) in FIG. The CPU 205 is a computer that interprets and executes a dimension management program. Hereinafter, the flow of processing will be described with reference to screen display examples of the display device 215 illustrated in FIGS. 8 to 11. Prior to the description, the contents of FIGS. 8 to 11 will be described. FIG. 8 is a schematic diagram of an input form, FIG. 9 is a schematic diagram of an input leak notification screen, and FIG. 10 is an allowable state of the bearing holding hole 17 of the bearing bracket 9. FIG. 11 is a schematic diagram of a notification screen for notifying that the state of the bearing holding hole 17 of the bearing bracket 9 is outside the allowable range.

  First, the dimension management program allows the input of the nominal diameter as the outer diameter reference dimension of the bearing 15 and the inner diameter reference dimension of the bearing holding hole 17 and the input of the outer diameter dimension of the bearing 15 as a measurement value. And the CPU 205 executes a function of allowing the input of the inner diameter dimension of the bearing holding hole 17 as a measurement value.

  That is, the CPU 205 provides an input form (step S101). As shown in FIG. 8, the input form includes five input items of “nominal diameter”, “bearing holding hole tolerance zone class”, “bearing grade”, “bearing outer diameter”, and “bearing holding hole inner diameter”. Two operation buttons, “Confirm button” and “Cancel button”, are prepared. “Nominal diameter” is a theoretically known value determined by the outer diameter of the bearing 15 or the inner diameter of the bearing holding hole 17 used in the electric motor 1 shown in FIG. The “bearing holding hole tolerance zone class” is a class range defined by Japanese Industrial Standards of the bearing holding hole 17 used in the electric motor 1 shown in FIG. 1, and is a known value. “Bearing grade” is an accuracy grade defined by Japanese Industrial Standards of the bearing 15 used in the electric motor 1 shown in FIG. 1, and is also a known value. “Bearing outer diameter” is an actual measurement value of the outer diameter dimension of the bearing 15 measured at a regular inspection or the like. Similarly, the “bearing holding hole inner diameter” is an actual measurement value of the inner diameter dimension of the bearing holding hole 17 measured at an opportunity such as periodic inspection. Any known measuring method can be used for measuring the outer diameter of the bearing 15 and the inner diameter of the bearing holding hole 17.

  Here, in the input form illustrated in FIG. 8, “bearing holding hole tolerance zone class” and “bearing grade” can be selected from a pull-down menu. The pull-down menu includes only the bearing holding hole tolerance range class and the bearing grade prepared as the definition file 301 illustrated in FIG. 5, or the bearing holding hole prepared as the definition file 301 illustrated in FIG. Only the combination of tolerance class and bearing grade is included.

  When all the items on the input form are input, the operator designates the “confirm button”. Thereby, the CPU 205 determines that an input completion designation has been made (step S102). Although not specified in the flowchart in FIG. 7, the CPU 205 temporarily stores the input items in the work area of the RAM 203 by designating the “confirm button”. When there is no input omission in the input form, the temporarily stored input items are the nominal diameter value, the bearing holding hole tolerance zone class, the bearing grade, the actual measured outer diameter dimension of the bearing 15, and the inner diameter dimension of the bearing holding hole 17. These are the five actual measured values.

  Subsequent to Y in step S102, the CPU 205 checks whether or not there is an input omission (step S103). If it is determined that an input omission has occurred (N in step S103), the CPU 205 executes an input omission notification process (step S103). S104). This process is executed by displaying the input omission notification screen illustrated in FIG. 9 on the display device 215 used by the operator. As shown in FIG. 9, on the input omission notification screen, items with omissions are listed as input omission reports.

  When it is determined in step S103 that there is no input omission (Y in step S103), the dimension management program calculates an inner diameter dimension error that is a difference value of the input value of the inner diameter dimension of the bearing holding hole 17 with respect to the input value of the nominal diameter. The CPU 205 is caused to execute the desired function (step S105). The inner diameter error of the bearing holding hole 17 is obtained by calculating the difference between the measured value of the inner diameter dimension of the bearing holding hole 17 temporarily stored in the work area of the RAM 203 and the nominal diameter value. In the flowchart of FIG. 7, for the sake of convenience, the value of the inner diameter dimension error is (A). (A) takes a positive value. The inner diameter dimension error (A) is temporarily stored in the work area of the RAM 203.

  Subsequently, the dimension management program causes the CPU 205 to execute a function of obtaining an outer diameter dimension error that is a difference value of the input value of the outer diameter dimension of the bearing 15 with respect to the input value of the nominal diameter (step S106). The outer diameter error of the bearing 15 is obtained by calculating the difference between the nominal diameter value temporarily stored in the work area of the RAM 203 and the actually measured value of the outer diameter dimension of the bearing 15. In the flowchart of FIG. 7, for the sake of convenience, the value of the outer diameter dimension error is (−B). (-B) takes a negative value. The outer diameter dimension error (−B) is temporarily stored in the work area of the RAM 203.

  Subsequently, the dimension management program causes the CPU 205 to execute a process of calculating a reference value or calling the reference value (step S107). The reference value is an allowable value of the gap between the outer diameter of the bearing 15 and the inner diameter of the bearing holding hole 17. The processing in step S107 for calculating such a reference value differs depending on the type of definition file 301 stored in the memory resource referenced by the computer. Therefore, the case where the definition file 301 illustrated in FIG. 5 is referred to and the case where the definition file 301 illustrated in FIG. 6 is referred will be described separately.

  The definition file 301 illustrated in FIG. 5 is defined for each size of the nominal diameter by associating the minimum allowable outer diameter of the bearing 15 and the maximum allowable inner diameter of the bearing holding hole 17 that differ according to the size of the nominal diameter. To do. Therefore, when referring to the definition file 301 illustrated in FIG. 5, the dimension management program refers to the definition file 301 and corresponds to the minimum allowable dimension and the maximum allowable value based on the input value of the nominal diameter temporarily stored in the RAM 203. The CPU 205 is caused to execute a function for calling a dimension. The minimum allowable dimension is defined in the definition file 301 as the minimum value of the outer diameter dimension tolerance of the bearing 15, and the maximum allowable dimension is defined as the maximum value of the inner diameter dimension tolerance of the bearing holding hole 17. Subsequently, the dimension management program causes the CPU 205 to execute a function of calculating the difference between the called maximum allowable dimension and the minimum allowable dimension as a reference value.

  The definition file 301 illustrated in FIG. 6 has a difference between the maximum allowable dimension of the inner diameter of the bearing holding hole 17 and the minimum allowable dimension of the outer diameter of the bearing 15 that is different depending on the size of the nominal diameter for each nominal diameter dimension. Is defined. That is, a reference value is defined in advance for each size of the nominal diameter. Therefore, when referring to the definition file 301 illustrated in FIG. 6, the dimension management program refers to the definition file 301 and causes the CPU 205 to execute a function of calling the corresponding reference value based on the input value of the nominal diameter.

  As described above, the definition file 301 includes the tolerance zone class of the predetermined bearing holding hole 17 and the accuracy grade of the bearing 15 (see FIG. 5), or the tolerance zone class of the predetermined bearing holding hole 17 and the bearing 15. A combination of accuracy grades is included (see FIG. 6). Therefore, which definition file 301 is referred to depends on the selection of “bearing holding hole tolerance zone class” and “bearing grade” in the input form illustrated in FIG.

  As described above, in the process of step S107, even when referring to the definition file 301 illustrated in FIG. 5 or referring to the definition file 301 illustrated in FIG. it can. In the flowchart of FIG. 7, for the sake of convenience, the acquired reference value is assumed to be (C). The reference value (C) is temporarily stored in the work area of the RAM 203.

  Subsequently, the dimension management program refers to the inner diameter dimension error (A), the outer diameter dimension error (−B), and the reference value (C) temporarily stored in the work area of the RAM 203 to determine the inner diameter dimension error (A). ) And the outer diameter dimension error (−B), the CPU 205 is caused to execute a function of determining whether the difference is smaller or larger than the reference value (C) (step S108). In this process, the measured value ((A)-(-B)) of the gap between the outer diameter of the bearing 15 and the inner diameter of the bearing holding hole 17 is within the reference value (C) that is the allowable value of the gap. This is a process for determining whether or not it is within the range.

  Subsequently, the dimensional management program is within the allowable range when the difference between the inner dimensional error (A) and the outer dimensional error (−B) is smaller than the reference value (C), and is outside the allowable range when it is large. The CPU 205 executes a function of giving a value evaluation that there is, and asserting the value evaluation to the outside via a computer interface (steps S109 and S110).

  That is, the difference between the inner diameter dimensional error (A) and the outer diameter dimensional error (−B) is smaller than the reference value (C) means that the gap between the outer diameter of the bearing 15 and the inner diameter of the bearing holding hole 17. The measured value ((A)-(-B)) is within the reference value (C), which is the allowable value of the gap, so that the value is evaluated as being within the allowable range (step S109). ). At this time, in the process of step S109, in order to express the value evaluation to the outside through the interface of the computer, the display device 215 is driven and controlled to display as exemplified in the notification screen of FIG. The notification screen of FIG. 10 provides information to the operator that the state of the bearing holding hole 17 is within an allowable range, and therefore there is no need for repairing the bearing holding hole 17.

  In contrast, the difference between the inner diameter dimensional error (A) and the outer diameter dimensional error (−B) is larger than the reference value (C), which means that the outer diameter of the bearing 15 and the inner diameter of the bearing holding hole 17 are different. Since the actually measured value ((A)-(-B)) between the gaps does not fall within the reference value (C) that is the allowable value of the gap, the value is evaluated as being outside the allowable range. (Step S110). At this time, in the process of step S110, in order to express the value evaluation to the outside through the interface of the computer, the display device 215 is driven and controlled to display as exemplified in the notification screen of FIG. The notification screen of FIG. 11 provides information to the operator that the state of the bearing holding hole 17 is outside the allowable range, and therefore the bearing holding hole 17 needs to be repaired.

It is a vertical side view of the electric motor which shows one Embodiment of this invention. It is a schematic diagram for demonstrating the clearance gap management between a bearing and a bearing bracket. It is a schematic diagram which shows the system configuration example containing the computer which interprets and performs the dimension management program of a bearing bracket. It is a block diagram which shows the hardware constitutions of the computer which interprets and performs the dimension management program of a bearing bracket. It is a schematic diagram which shows a definition file. It is a schematic diagram which shows another definition file. It is a flowchart which shows the flow of the process which a computer performs according to the dimension management program of a bearing bracket. It is a schematic diagram of an input form. It is a schematic diagram of an input leak notification screen. It is a schematic diagram of the notification screen which alert | reports that the state of the bearing holding hole of a bearing bracket is in an allowable range. It is a schematic diagram of the notification screen which alert | reports that the state of the bearing holding hole of a bearing bracket is outside an allowable range.

Explanation of symbols

23 Bearing 25 Bearing bracket 29 Bearing holding hole 101 Computer (server)
103 Computer (Client PC)
105 Computer (personal digital assistant)
201 Memory resource (HDD)
203 Memory resources (RAM)
207 Memory resources (flash ROM)
209 Memory resource (ROM)
215 Interface (display device)
301 Definition file

Claims (5)

A step of obtaining an outer diameter dimension error which is a difference value with respect to an outer diameter reference dimension which is zero tolerance of the bearing from a measurement value of the outer diameter dimension of the bearing;
A step of obtaining an inner diameter dimension error which is a difference value from an inner diameter reference dimension which is zero tolerance of the bearing holding hole from a measured value of an inner diameter dimension of a bearing holding hole of a bearing bracket which holds the bearing by fitting;
With the difference between the maximum allowable dimension of the inner diameter of the bearing holding hole and the minimum allowable dimension of the outer diameter of the bearing as a reference value, the difference between the inner diameter dimension error and the outer diameter dimension error is smaller than the reference value. A process of giving a value evaluation that it is within an allowable range and that it is out of the allowable range when it is large;
A dimension management method for a bearing bracket comprising:   The method of claim 1, wherein the bearing is used for supporting a rotating shaft of an electric motor. Interpreted and executed by a computer,
A function that allows an input of an outer diameter reference dimension that is zero tolerance of the bearing and a nominal diameter that is an inner diameter reference dimension that is zero tolerance of a bearing holding hole of a bearing bracket that holds the bearing by fitting;
A function that allows an input of the outer diameter of the bearing as a measurement value;
A function that allows an input of an inner diameter dimension of the bearing holding hole as a measurement value;
A function for obtaining an outer diameter dimension error which is a difference value of an input value of the outer diameter dimension of the bearing with respect to an input value of the nominal diameter;
A function for obtaining an inner diameter dimensional error which is a difference value of an input value of the inner diameter dimension of the bearing holding hole with respect to an input value of the nominal diameter;
A memory that can be accessed by the computer by defining a minimum allowable outer diameter of the bearing and a maximum allowable inner diameter of the bearing holding hole that are different depending on the size of the nominal diameter in association with the size of the nominal diameter. A function for referring to the definition file stored in the resource and calling the corresponding minimum allowable dimension and the maximum allowable dimension based on the input value of the nominal diameter;
A function for calculating a difference between the called maximum allowable dimension and the minimum allowable dimension as a reference value;
A function of determining whether a difference between the inner diameter dimension error and the outer diameter dimension error is smaller or larger than the reference value;
A value evaluation that the difference between the inner diameter dimensional error and the outer diameter dimensional error is smaller than the reference value is within the allowable range and large is out of the allowable range is given, and the value evaluation is given to the computer interface. With the ability to express outside via
A program for managing the dimensions of bearing brackets. Interpreted and executed by a computer,
A function that allows an input of an outer diameter reference dimension that is zero tolerance of the bearing and a nominal diameter that is an inner diameter reference dimension that is zero tolerance of a bearing holding hole of a bearing bracket that holds the bearing by fitting;
A function that allows an input of the outer diameter of the bearing as a measurement value;
A function that allows an input of an inner diameter dimension of the bearing holding hole as a measurement value;
A function for obtaining an outer diameter dimension error which is a difference value of an input value of the outer diameter dimension of the bearing with respect to an input value of the nominal diameter;
A function for obtaining an inner diameter dimensional error which is a difference value of an input value of the inner diameter dimension of the bearing holding hole with respect to an input value of the nominal diameter;
The difference between the maximum permissible dimension of the inner diameter of the bearing holding hole and the minimum permissible dimension of the outer diameter of the bearing, which differ according to the dimension of the nominal diameter, is defined for each nominal diameter dimension as a reference value and is accessible by the computer A function that refers to a definition file stored in a memory resource and calls the corresponding reference value based on an input value of the nominal diameter;
A function of determining whether a difference between the inner diameter dimensional error and the outer diameter dimensional error is smaller or larger than the called reference value;
A value evaluation that the difference between the inner diameter dimensional error and the outer diameter dimensional error is smaller than the reference value is within the allowable range and large is out of the allowable range is given, and the value evaluation is given to the computer interface. With the ability to express outside via
A program for managing the dimensions of bearing brackets.   The bearing bracket dimensional management program according to claim 3 or 4, wherein the bearing is used for supporting a rotating shaft of an electric motor.

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