Heat radiation amount measuring device and heat radiation amount measurement method

Abstract

To provide a heat radiation amount measuring device and a heat radiation amount measurement method capable of digitizing the amount of heat radiation of a testing machine and a mechanical device.SOLUTION: Constituted are a heat radiation amount measuring device 1 having a shaft body 2, an electric heater 3 provided in a position in which a bearing for rotatably supporting the shaft body 2 so as to be replaced with the bearing or a peripheral component of the bearing, a housing 4 to which the shaft body 2 and the electric heater 3 are mounted, a wattmeter 5 for measuring the amount of power supplied to the electric heater 3, a thermometer 6 for measuring the temperature of the housing 4, and a temperature controller 7 for controlling the amount of energization to the electric heater 3 such that temperature measured by the thermometer 6 becomes a predetermined terminal temperature, and a heat radiation amount measurement method for replacing the bearing of a mechanical device or the like, or a peripheral component of the bearing with the electric heater 3 and then energizing the electric heater 3, controlling the amount of power supplied to the electric heater 3 such that the temperature of the housing 4 becomes a predetermined terminal temperature, converting the amount of power to the amount of heat generation, and then measuring the amount of heat radiation by assuming that the amount of heat generation matches the amount of heat radiation from the mechanical device or the like.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a heat radiation amount measuring device and a heat radiation amount measuring method for measuring the amount of heat radiation from a testing machine or mechanical device equipped with a bearing. [Background technology]

[0002] The shift to electric vehicles is driving a race to develop bearings with higher speed performance and lower friction. As one of the indicators of higher speed performance and lower friction, the thermal rated rotational speed, which indicates the high-speed performance of bearings, has been standardized by ISO / JIS (see ISO15312:2003 / JISB1550:2010), and this standard has begun to be included in product catalogs and other publications.

[0003] The thermal rated speed is the rotational speed at which the loss (heat generation) associated with the rotation of the bearing and the heat dissipation to the outside are balanced and the specified bearing temperature is reached. However, because this thermal rated speed is affected by the inherent heat dissipation characteristics of each testing machine or mechanical device, it is difficult to make an absolute evaluation between published values, and this has been a long-standing issue.

[0004] In developing high-speed performance, it is necessary to understand the heat balance of the bearing to indicate the thermally permissible rotational speed. The thermal equilibrium state related to this heat balance can be expressed by the following equation (1). Qbrg=Qlub+Qmc (1) Here, Qbrg is the amount of heat generated by the bearing, Qlub is the amount of heat removed by lubrication (oil supply and drainage), and Qmc is the amount of heat dissipated from the test machine or mechanical equipment. For example, in the case of grease lubrication or oil bath lubrication, there is no heat removal due to lubrication (Qlub=0), so the above formula (1) showing the thermal equilibrium state becomes Qbrg=Qmc. Note that energy losses caused by noise and vibrations during operation also occur as energy that balances with Qbrg, but as this energy loss is minor compared to the total amount of energy, it can be excluded from the above formula (1).

[0005] The value of Qbrg can be calculated or measured as a work equivalent, and the value of Qlub can be calculated or measured. On the other hand, the value of Qmc is difficult to calculate or measure, making it difficult to grasp the heat dissipation characteristics of testing equipment and mechanical devices.

[0006] The following Patent Document 1 discloses a means for controlling the amount of heat dissipated by a bearing while it is in operation in a measuring device for measuring the characteristics (rotational torque) of a test bearing. This measuring device makes it possible to control the amount of heat dissipated by the bearing by circulating liquid inside a bearing housing that supports the outer ring of the bearing, or by providing a heating means such as a heat pipe or band heater in the bearing housing to change the amount of heat dissipated by the bearing in a stepless manner. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] JP 2003-56584 A Summary of the Invention [Problem to be solved by the invention]

[0008] In the configuration according to Patent Document 1, a liquid is circulated in the bearing housing to control the amount of heat dissipated by the bearing. However, if the liquid is heated beyond its flash point, a flammable mixture is likely to be generated, which is undesirable from the viewpoint of safety management, and therefore the upper limit of the target set temperature of the bearing may be limited. In addition, since the amount of heat dissipated is controlled while the bearing is in operation, the bearing temperature may change due to leakage or deterioration of the lubricant during operation, and the amount of heat dissipated may not be stable. In addition, the bearing temperature and the amount of heat dissipated may also change due to individual differences in the bearings used (different bearing internal clearances, roughness of the raceway surface, radius of curvature of the raceway groove, etc.). Furthermore, in the method of controlling the amount of heat dissipated by using the heating means, the total surface area of ​​the device increases due to the provision of the heating means, which increases the amount of heat dissipated into the atmosphere, and there is also the problem that the amount of heat dissipated by the bearing is unstable. In addition, this configuration is for controlling the amount of heat dissipated by the bearing, and it is not possible to measure the amount of heat dissipated inherent to the device itself.

[0009] In addition, because the high-speed performance of rolling bearings is also the maximum thermally permissible rotational speed, heat management to understand and control the heat balance is important for the development of high-speed performance, lubrication design, and application consideration of this bearing. As explained above, the heat generated by the bearing is balanced with the heat dissipated from the lubricating oil and the test machine and mechanical equipment, and determines the bearing temperature during operation. Therefore, it is necessary to ensure accuracy by actually measuring and quantifying the amount of heat dissipated from the test machine and mechanical equipment, but in the past, it was difficult to actually measure it, and only estimated values ​​were used.

[0010] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide a heat radiation amount measuring device and a heat radiation amount measuring method that can quantify and evaluate the heat radiation amount of a testing machine or mechanical device. [Means for solving the problem]

[0011] In order to solve the above problems, the present invention provides: A shaft body, an electric heater provided at a position where a bearing that supports the shaft body is provided so as to be replaceable with the bearing or a peripheral part of the bearing; a housing in which the shaft body and the electric heater are mounted; a power meter for measuring the amount of power supplied to the electric heater; a thermometer for measuring a temperature of the housing; a temperature regulator that controls the amount of electricity supplied to the electric heater so that the temperature measured by the thermometer becomes a predetermined equilibrium temperature; A heat radiation measuring device having the above structure was constructed.

[0012] In this way, a test machine or machine in which only the bearing or the peripheral parts of the bearing are replaced with an electric heater can be used to measure the heat dissipation amount, and the heat dissipation property of the test machine or machine can be easily quantified. Accordingly, thermal characteristics such as thermal resistance and heat flux density can also be quantified, and a design guideline for the test machine or machine considering the heat dissipation property can be obtained. As a result, in a situation where high-speed performance of bearings is more important with the electrification of cars, the heat dissipation amount of the test machine or machine, which was a major error factor, can be quantified based on actual measurement, and high-speed performance development of bearings and lubrication design can be performed with high accuracy. Furthermore, the heat dissipation amount required for the test machine or machine to which the bearing is applied can be specified. Note that the peripheral parts of the bearing referred to here refer to various parts such as a housing and a spacer that contain the bearing. In addition, the predetermined equilibrium temperature refers to an equilibrium temperature that is set as a test condition in a certain bearing evaluation test, or that is desired to be set as a test condition.

[0013] In the heat radiation amount measuring device according to the above configuration, it is preferable to further include a cooling mechanism for cooling the housing. In this way, the cooling capacity of the cooling mechanism for cooling the mechanical device can be quantified and evaluated from the increase in the amount of electric power of the electric heater when the cooling mechanism is operated.

[0014] In the heat dissipation measuring device equipped with the cooling mechanism, the cooling mechanism can be at least one of an air-cooling device and a cooling device using a cooling liquid. These cooling mechanisms are relatively simple in structure and can change the cooling capacity as desired by controlling the air volume or the liquid flow rate, so that the cooling capacity of the cooling mechanism can be evaluated more quantitatively.

[0015] In order to solve the above problems, the present invention provides: A heat dissipation measurement method has been created in which a shaft is rotatably supported by a bearing, and the bearing or a bearing peripheral part of a mechanical device in which the shaft and bearing are attached to a housing is replaced with an electric heater, electricity is passed through the electric heater, the amount of electricity supplied to the electric heater is controlled so that the temperature of the housing becomes a predetermined equilibrium temperature, the amount of electricity is converted into a heat generation amount, and the heat generation amount is regarded as the heat generation amount from the mechanical device, thereby measuring the amount of heat generation.

[0016] In this way, a measurement test of the heat dissipation amount can be performed using a machine in which only the bearing or the peripheral parts of the bearing are replaced with an electric heater, and the heat dissipation property of the machine can be easily quantified. Accordingly, thermal characteristics such as thermal resistance and heat flux density can also be quantified, and a design guideline for the machine considering the heat dissipation property can be obtained. As a result, in a situation where the high-speed performance of bearings is more important with the electrification of cars, the heat dissipation amount of the test machine and the machine, which was a major error factor, can be quantified based on actual measurement, and it is expected to be used in the development of high-speed bearings. Note that the peripheral parts of the bearing referred to here means various parts such as a housing and a spacer that contains a bearing. Also, the predetermined equilibrium temperature means an equilibrium temperature that is set as a test condition in a certain bearing evaluation test, or that is to be set as a test condition.

[0017] In the heat dissipation amount measuring method according to the above configuration, it is preferable to evaluate the cooling capacity of the cooling mechanism from the increase in the amount of electric power caused by operating the cooling mechanism provided in the housing. In this way, the cooling capacity when the mechanical device is cooled by the cooling mechanism can be quantified and evaluated.

[0018] In the heat dissipation measurement method provided with the cooling mechanism, it is preferable that the cooling mechanism is at least one of an air-cooling device and a cooling device using a cooling liquid. These cooling mechanisms are relatively simple in structure and can change the cooling capacity as desired by controlling the air volume or the liquid flow rate, so that the cooling capacity of the cooling mechanism can be evaluated more quantitatively. Effect of the Invention

[0019] In this invention, the bearing or bearing peripheral parts that support the rotation of the shaft are replaced with an electric heater, and the amount of power of the electric heater is controlled so that the temperature of the shaft and the housing to which the electric heater is attached reaches a predetermined equilibrium temperature.This makes it possible to easily quantify the heat dissipation properties of testing equipment or mechanical equipment in which bearings are installed, and provides design guidelines for testing equipment or mechanical equipment that take into account the heat dissipation characteristics.

[0020] In addition, since it is possible to quantify the amount of heat dissipated by the temperature of the test machine or machine, it is possible to appropriately estimate the heat balance, and it is possible to calculate the amount of heat required to dissipate through the lubricant from the amount of heat generated by heat-generating bodies such as bearings, and to present and verify the conditions under which operation is possible. This makes it possible to predict in advance the amount of lubricant supply required for heat dissipation and the supply temperature, and, for example, to estimate the maximum rotation speed possible when oil at a certain temperature is circulated at a certain flow rate.

[0021] In addition, by measuring the heat dissipation of a test machine or machine, it is possible to develop high-speed performance of the bearing and design the lubrication accurately. Furthermore, it is possible to clearly indicate the heat dissipation required for the test machine or machine to which the bearing is applied. [Brief description of the drawings]

[0022] [Figure 1] FIG. 1 is a cross-sectional view showing one embodiment of a heat radiation measuring device according to the present invention. [Diagram 2] Schematic diagram of the electrical circuit of the heat dissipation measuring device shown in FIG. [Diagram 3]1 is a flowchart showing the flow of a heat radiation amount measuring method according to the present invention. [Figure 4] FIG. 2 is a cross-sectional view showing another example of the heat radiation measuring device shown in FIG. [Diagram 5] FIG. 5 is a cross-sectional view showing another example of the heat radiation amount measuring device shown in FIG. [Figure 6] FIG. 2 is a cross-sectional view showing still another example of the heat radiation measuring device shown in FIG. [Figure 7] FIG. 2 is a cross-sectional view showing still another example of the heat radiation measuring device shown in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] An embodiment of the heat dissipation measuring device 1 according to the present invention is shown in Fig. 1, and a schematic diagram of the electric circuit of the heat dissipation measuring device 1 is shown in Fig. 2. The heat dissipation measuring device 1 is a device used when measuring the heat dissipation of a test machine or a mechanical device, and its main components are a shaft body 2, an electric heater 3 provided at a position where a bearing for supporting the rotation of the shaft body 2 is provided so as to be replaceable with the bearing, a housing 4 to which the shaft body 2 and the electric heater 3 are attached, a wattmeter 5 for measuring the amount of power supplied to the electric heater 3, a thermometer 6 for measuring the temperature of the housing 4, and a temperature regulator 7 for controlling the amount of electricity supplied to the electric heater 3 so that the temperature measured by the thermometer 6 becomes a predetermined equilibrium temperature. The actual test machine or mechanical device is the heat dissipation measuring device 1 with the electric heater 3 replaced with a bearing.

[0024] The shaft body 2 is provided with electric heaters 3 at four locations where bearings would normally be provided. The bearings corresponding to the positions of the electric heaters 3 at two ends are for rotatably supporting the shaft body 2 with respect to the housing 4, and the bearings corresponding to the positions of the electric heaters 3 at two inner locations are for supporting the load member 8 provided on the shaft body 2 with relative rotation with respect to the shaft body 2. When the electric heaters 3 are replaced with bearings (when returning to the original configuration of the testing machine or mechanical device), a rotational drive device (not shown) or the like is connected to the shaft body 2 for applying a rotational drive force to the shaft body 2.

[0025] The electric heater 3 is an annular shape with the same inner and outer diameters as the bearings installed in the testing machine or mechanical device, and is structured with a heating element housed in a hollow annular case. Each electric heater 3 is designed to generate a larger amount of heat than the amount of heat generated by the bearings that are originally installed during operation. Each electric heater 3 is supplied with power from a power source 9.

[0026] The shaft body 2 and electric heater 3 are attached to the housing 4. A load member 8 supported by the shaft body 2 via the electric heater 3 is accommodated in the internal space of the housing 4. A thermometer insertion hole 10 for inserting a thermometer 6 is formed in the housing 4, corresponding to the attachment position of the electric heater 3 (originally the position of the bearing). The tip of the thermometer insertion hole 10 reaches close to each electric heater 3.

[0027] The housing 4 is provided with a cooling device 11a using a coolant as a cooling mechanism 11 for cooling the housing 4. The cooling device 11a has a coolant path (hereinafter, the same reference numeral as the cooling device 11a is used) passing through the vicinity of the installation position of the electric heater 3, and the housing 4 is cooled by circulating a coolant such as oil or water through the coolant path 11a. The temperature and flow rate of the coolant flowing through the coolant path 11a can be appropriately adjusted by controlling a chiller, cooler, and pump (none of which are shown) provided within the coolant path 11a. Note that the coolant path 11a is not an essential component and may be omitted in some cases.

[0028] Near the housing 4 (in this embodiment, on the top of the housing 4), an air-cooling device 11b is provided as a cooling mechanism 11 that cools the surface of the housing 4. In this embodiment, a fan (hereinafter, given the same reference number as the air-cooling device 11b) is used as the air-cooling device 11b. The air volume of the fan 11b can be adjusted as appropriate.

[0029] A wattmeter 5 is provided in the middle of the wiring to each electric heater 3 so as to measure the amount of power supplied to each electric heater 3. In addition, a total wattmeter 12 for measuring the total amount of power supplied to each electric heater 3 is also provided.

[0030] The thermometer 6 is a thermocouple inserted into a thermometer insertion hole 10 formed in the housing 4. Each thermometer 6 measures the temperature of the housing 4 facing the electric heater 3 (the thermometer 6 provided on the load member 8 is the load member 8). Here, the thermometer 6 provided at the position (two positions on both ends) where the bearing supporting the shaft body 2 rotatably relative to the shaft body 2 was provided is distinguished as the test section thermometer 6a, and the thermometer 6 provided at the position (two positions on the inside) where the bearing supporting the load member 8 provided on the shaft body 2 rotatably relative to the shaft body 2 was provided is distinguished as the support section thermometer 6b. In this way, by determining the heat dissipation amount of the test machine or machine device using multiple thermometers 6, it is also possible to know the heat dissipation amount of the bearing at the equilibrium temperature when the bearing is actually operated. Note that the thermometer 6 is not limited to a thermocouple, and other types of thermometers 6 may be used.

[0031] It is sufficient that the measurement value of at least one of the thermometers 6 provided on each of the multiple electric heaters 3 is input to the temperature regulator 7, and in this embodiment, the measurement values ​​of the test part thermometers 6a provided at two locations on both ends of the four thermometers 6 provided on the housing 4 are input. Note that the measurement value of the support part thermometer 6b is not input to the temperature regulator 7, but is treated as a reference value indicating the temperature of the load member 8.

[0032] A heat dissipation measurement method using this heat dissipation measurement device 1 will be described with reference to Fig. 3. In this heat dissipation measurement method, first, a test machine (mechanical device) for the evaluation bearing is selected, and a shaft 2, housing 4, and peripheral parts of the bearing are designed and manufactured to match it (step S1 in Fig. 3). Then, a jig including the designed shaft 2, housing 4, and peripheral parts of the bearing are attached to the test machine, the bearing that supports the rotation of the shaft 2 is replaced with an electric heater 3, electricity is applied to the electric heater 3, and the heat dissipation of the test machine including the jig is measured in a natural cooling state without forced cooling (a state in which both the cooling device 11a and the air-cooling device 11b are stopped) (step S2 in Fig. 3).

[0033] When the temperature of the housing 4 reaches a predetermined equilibrium temperature, the amount of electric power is measured by the wattmeter 5 (total wattmeter 12). When heating is performed by resistance heating of the electric heater 3 as in this embodiment, almost 100% of the electric energy supplied from the power source 9 to the electric heater 3 is converted into thermal energy. For this reason, the amount of electric power consumed by the electric heater 3 is regarded as the Joule heat (amount of heat generated) of the electric heater 3, and the amount of heat dissipation Qmc1 (specific amount of power consumption Wh1) is measured by assuming that the Joule heat of the electric heater 3 matches the amount of heat dissipation from the heat dissipation amount measuring device 1 (machine) when the temperature reaches equilibrium (step S2 in FIG. 3). The equipment thermal resistance value (°C / W) is calculated from the value of the amount of heat dissipation Qmc1, and the heat flux density (W / mm 2 ) can be calculated. In addition, by changing the equilibrium temperature in predetermined temperature increments (for example, in 10 degree increments), a graph of the temperature rise and the temperature dependency of the heat dissipation amount Qmc1 is obtained.

[0034] Furthermore, it is determined whether the measured heat dissipation amount Qmc1 of the testing machine reaches the target value (whether it is as the target value) (step S3 in FIG. 3). If the heat dissipation amount Qmc1 is lower or higher than the target value (No side of step S3 in FIG. 3), the testing machine is selected and the shaft body 2, housing 4, and peripheral parts of the bearing are redesigned and remanufactured (step S1 in FIG. 3). On the other hand, if the heat dissipation amount Qmc1 reaches the target value (Yes side of step S3 in FIG. 3), the process moves to considering the cooling conditions of the testing machine. The cooling conditions include the flow rate and temperature of the cooling liquid flowing through the cooling liquid path 11a and the air volume of the air-cooling device 11b (step S4 in FIG. 3).

[0035] Based on each combination of these cooling conditions, the heat dissipation Qmc2 (power consumption during cooling Wh2) of the testing machine including fixtures such as the shaft 2, housing 4, and peripheral bearing parts is measured when electricity is applied to the electric heater 3. Then, in the same manner as above, the equilibrium temperature is changed in predetermined temperature increments (for example, in 10 degree increments) to obtain a graph of the temperature rise and the temperature dependency of the heat dissipation Qmc2.

[0036] During cooling by the cooling mechanism 11, an extra amount of power is required to maintain the equilibrium temperature by the amount of heat lost by the cooling. This amount of power is the difference Wh2-Wh1 obtained by subtracting the specific power consumption Wh1 from the power consumption during cooling Wh2. The cooling capacity of the cooling mechanism 11 can be quantified by deriving the amount of heat dissipation from the power consumption related to this difference Wh2-Wh1 (step S6 in FIG. 3).

[0037] Furthermore, it is determined whether the forced cooling capacity is sufficient based on the calculated cooling capacity (Wh2-Wh1) (step S7 in FIG. 3). If the forced cooling capacity is lower than expected (No in step S7 in FIG. 3), the cooling conditions of the test machine are reconsidered (step S4 in FIG. 3). On the other hand, if sufficient forced cooling capacity is ensured (Yes in step S7 in FIG. 3), the series of flows ends (step S8 in FIG. 3).

[0038] According to the above-described method for measuring the amount of heat dissipation, the cooling capacity of each coolant can be quantified based on the amount of power consumed when coolants with different specific heats are circulated through the coolant passage 11a.

[0039] Furthermore, by acquiring the specific power consumption Wh1 and cooling power consumption Wh2 of the test machine using the above heat dissipation measurement method, it is possible to estimate the amount of heat generated from the bearing Qbrg based on bearing torque calculations, and the amount of heat dissipated by lubrication (oil supply and drainage) Qlub. If the bearing temperature is higher than the allowable value when the bearing is rotated at the target rotation speed while performing forced cooling of the test machine, or if the speed at which the target rotation speed is reached is low, measures such as reviewing the bearing design and lubrication design (amount and temperature of cooling oil, etc.) are taken.

[0040] In the above, the heat dissipation measuring device 1 is shown to be compatible with a testing machine or mechanical device in which the shaft body 2 is supported by a plurality of bearings, but as shown in Fig. 4, the heat dissipation measuring device 1 can also be compatible with a testing machine or mechanical device in which the shaft body 2 is supported by a single bearing. As in the configuration shown in Fig. 1, this heat dissipation measuring device 1 has an electric heater 3 provided at a position where a bearing that supports the rotation of the shaft body 2 is provided so as to be replaceable with this bearing, and the electric heater 3 is provided with a wattmeter 5 for measuring the amount of power supply.

[0041] The housing 4 is formed with a thermometer insertion hole 10 corresponding to the mounting position of the electric heater 3 (originally the position of the bearing), and a thermocouple serving as a thermometer 6 (test section thermometer 6a) is inserted into this thermometer insertion hole 10. The housing 4 is also formed with a cooling liquid path 11a of a cooling device 11a serving as a cooling mechanism 11 that cools the housing 4, and the housing 4 is cooled by circulating a cooling liquid through this cooling liquid path 11a. Note that the cooling liquid path 11a is not an essential component, and may be omitted as shown in FIG. 5.

[0042] In the heat dissipation measuring device 1 of Figure 4 or Figure 5, the amount of heat dissipation from the heat dissipation measuring device 1 can be measured in the same manner as described above by using a power meter 5 to measure the amount of electricity when the temperature of the housing 4 reaches a predetermined equilibrium temperature.

[0043] In the above embodiment, an example in which the housing 4 is made of one member has been shown, but as shown in Fig. 6, the housing 4 can also be made of two members, an outer diameter side housing 4a and an inner diameter side housing 4b. The outer diameter side housing 4a and the inner diameter side housing 4b are integrated by fastening means (not shown) such as bolts. In this heat dissipation measuring device 1, similar to the configuration shown in Fig. 1, an annular electric heater 3 is provided at a position where a bearing for supporting the rotation of the shaft body 2 is provided so as to be replaceable with the bearing. The basic configuration and functions of this heat dissipation measuring device 1 are similar to those of the configuration shown in Fig. 1, so detailed explanations will be omitted.

[0044] In the configuration shown in Figure 6, an annular electric heater 3 similar to that in Figure 1 is used, but as shown in Figure 7, it is also possible to use a configuration using cylindrical heater units 13a, 13b in which multiple cartridge-type heaters 3 are equally arranged circumferentially (eight at 45 degree intervals in this embodiment) on the pitch circle of the bearing to be replaced.

[0045] The heater units 13a provided at both axial ends of the heat dissipation measuring device 1 have an inner diameter equal to that of the bearing to be replaced, and an outer diameter equal to that of the inner diameter side housing 4b (see FIG. 4). The heater units 13a are provided at the positions shown in FIG. 7 by replacing the bearing peripheral parts consisting of the inner diameter side housing 4b containing the bearing and the spacer 14 (see FIG. 6).

[0046] Moreover, the heater unit 13b provided on the axial inside of the heat radiation measuring device 1 has an inner diameter equal to the inner diameter of the bearing it replaces, and an outer diameter substantially equal to the outer diameter of the bearing it replaces.

[0047] The heat dissipation measuring device 1 is configured to have an electric heater 3 installed at a position where a bearing or a peripheral part of a bearing that supports the rotation of a shaft body 2 is installed so that the electric heater 3 can be substituted for the bearing or the peripheral part of the bearing. This allows a test to measure the heat dissipation of the bearing or the peripheral part of the bearing to be performed using a test machine or a machine in which the bearing or the peripheral part of the bearing is replaced with the electric heater 3, and the heat dissipation of the test machine or the machine can be easily quantified. This improves the development capability of the high-speed performance and low-resistance performance of bearings. It also allows a quantitative evaluation of the thermal rated rotation speed published by each bearing manufacturer. Furthermore, it eliminates the problem of differences in test machines and machines when actually measuring the thermal permissible rotation speed, and allows the high-speed performance of bearings to be appropriately and quantitatively evaluated.

[0048] Also, the amount of temperature rise per unit of heat generation per unit time, i.e., thermal resistance value, can be quantified from the measured amount of heat dissipation. Furthermore, by calculating the surface area of ​​the test machine or machine, the amount of heat passing through a unit area per unit time, i.e., heat flux density, can be quantified. From these, it is possible to obtain design guidelines for test machines and machines that take heat dissipation characteristics into consideration. Also, by changing the value of a predetermined equilibrium temperature when electricity is applied to the electric heater 3 (for example, by increasing the value of the equilibrium temperature from 60°C to 100°C), it is possible to grasp the equilibrium temperature dependence of the amount of heat dissipation, thermal resistance value, and heat flux density of the test machine or machine and adjust the increase or decrease. This allows, for example, rapid development of products suitable for high-speed ranges with improved heat dissipation.

[0049] In addition, by quantifying the amount of heat dissipated by the temperature of the test machine or machine, it is possible to appropriately estimate the heat balance, and from the amount of heat generated by heat-generating bodies such as bearings, it is possible to calculate the amount of heat required to dissipate through lubricants, and to present and verify the conditions under which operation is possible. This makes it possible to predict in advance the amount of lubricant supply required for heat dissipation and the supply temperature, and, for example, to estimate the maximum possible rotation speed when oil at a certain temperature is circulated at a certain flow rate.

[0050] In addition, the heat dissipation amount measuring device 1 is provided with the air-cooling device 11b and the cooling device 11a as the cooling mechanism 11 for cooling the housing 4, so that the cooling capacity of the mechanical device cooled by the cooling mechanism 11 can be quantified and evaluated from the increase in the amount of electric power of the electric heater 3 when the cooling mechanism 11 is operated. In addition, the air-cooling device 11b and the cooling device 11a have a relatively simple configuration, and the cooling capacity can be freely changed by controlling the air volume and the liquid flow rate, so that the cooling capacity of the cooling mechanism 11 can be evaluated more quantitatively. In this embodiment, the cooling mechanism 11 is provided with both the air-cooling device 11b and the cooling device 11a, but there are also cases where the heat dissipation amount measuring device 1 can be provided with only one of them, or the cooling mechanism 11 is not provided.

[0051] The embodiments disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present invention is defined by the claims, not the above description, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0052] 2-axis body 3 Electric heater 4. Housing 5 Power meter 6 thermometer 7 Temperature controller 11 Cooling mechanism 11a Cooling device (cooling liquid path) 11b Air cooling device (fan)

Claims

1. A shaft body (2), an electric heater (3) provided at a position where a bearing for supporting the rotation of the shaft body (2) is provided so as to be replaceable with the bearing or a peripheral part of the bearing; a housing (4) in which the shaft body (2) and the electric heater (3) are attached; A power meter (5) for measuring the amount of power supplied to the electric heater (3); a thermometer (6) for measuring the temperature of the housing (4); a temperature regulator (7) for controlling the amount of electricity supplied to the electric heater (3) so that the temperature measured by the thermometer (6) becomes a predetermined equilibrium temperature; A heat dissipation measuring device having the above structure.

2. 2. The heat radiation measuring device according to claim 1, further comprising a cooling mechanism (11) for cooling the housing (4).

3. 3. The heat radiation measuring device according to claim 2, wherein the cooling mechanism (11) is at least one of an air-cooling device (11b) and a cooling device (11a) using a cooling liquid.

4. A method for measuring heat dissipation in which a shaft (2) is rotatably supported by a bearing, and the shaft (2) and the bearing are attached to a housing (4), the bearing or a peripheral part of the bearing is replaced with an electric heater (3), electricity is passed through the electric heater (3), the amount of electricity supplied to the electric heater (3) is controlled so that the temperature of the housing (4) becomes a predetermined equilibrium temperature, the amount of electricity is converted into a heat generation amount, and the heat generation amount is regarded as the amount of heat dissipation from the mechanical device.

5. 5. The method for measuring a heat radiation amount according to claim 4, further comprising the step of evaluating the cooling capacity of the cooling mechanism (11) provided in the housing (4) from the increase in the amount of electric power consumed by operating the cooling mechanism (11).

6. 6. The method for measuring a heat radiation amount according to claim 5, wherein the cooling mechanism (11) is at least one of an air-cooling device (11b) and a cooling device (11a) using a cooling liquid.

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