JP2012173185A - Transmission error measurement device of vehicle power transmission device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transmission error measurement device of a vehicle power transmission device that measures a transmission error at an actual operation temperature of the vehicle power transmission device with high accuracy.SOLUTION: In the transmission error measurement device 10, a constant-temperature unit 50 heats a transaxle 12 during measurement of transmission error to maintain the transaxle 12 at a predetermined measurement temperature. The measurement temperature is set to an actual operation temperature of the transaxle 12, thereby measuring the transmission error at the actual temperature of the transaxle 12 with high accuracy, resulting in correct evaluation of the transmission error of the transaxle 12.

Description

  The present invention relates to a meshing transmission error measuring device for a vehicle power transmission device, and more particularly to a device capable of measuring a meshing transmission error at an actual operating temperature of a vehicle power transmission device with high accuracy.

  In a vehicle power transmission device that includes a pair of gears that mesh with each other and rotate for power transmission, a meshing transmission error occurs due to tooth surface shape error or tooth deflection, which affects power transmission performance or generates vibration. To do. In order to detect such meshing transmission error, the pair of first gear and second gear meshing with each other are rotated with a predetermined meshing load applied, and the rotation angles of the first gear and the second gear are respectively determined by a rotary encoder. There has been proposed a meshing transmission error measuring device for a vehicle power transmission device that detects the rotational angle deviation by measuring.

  For example, in the meshing transmission error measuring devices disclosed in Patent Document 1 and Patent Document 2, in the final reduction gear of the vehicle, the rotation controlled by the input side motor connected to the drive pinion is given, and the driven side is operated. The mesh transmission error is measured by detecting the rotation angle of the input side and the output side with a rotary encoder and calculating the mutual phase difference while giving the load torque controlled by the output side motor connected to a certain side gear. . This meshing transmission error measurement is generally performed under extremely low speed rotation in order to avoid the influence of measuring machine vibration.

JP 2008-145197 A Japanese Patent Laid-Open No. 06-074868

  By the way, the conventional meshing transmission error measuring apparatus measures the meshing transmission error of the gear mechanism that constitutes the vehicle power transmission device at room temperature. For example, it is a temperature that greatly falls below the actual operating temperature of about 80 ° C. In addition, since the measurement is performed in a temperature environment in which the temperature varies, the misalignment of the gear in the actual operation state in which the components of the gear mechanism are thermally expanded cannot be considered. For this reason, the accuracy of the measured value of the meshing transmission error cannot be obtained, and it is difficult to say that the evaluation of the transmission error is accurate.

  The present invention has been made against the background of the above circumstances, and the object of the present invention is to provide a vehicle power transmission capable of measuring the mesh transmission error at the actual operating temperature of the vehicle power transmission device with high accuracy. An object of the present invention is to provide a device for measuring a meshing transmission error of a device.

  In order to achieve the above object, the gist of the present invention is that: (a) meshing transmission of a power transmission device mounted on a vehicle and outputting a rotation input from a driving force source of the vehicle via a gear mechanism A meshing transmission error measuring device for a vehicle power transmission device that measures an error based on rotation of an input member and output member of the power transmission device, and (b) during measurement of the meshing transmission error, It is intended to include a thermostatic device for heating the power transmission device and maintaining the power transmission device at a predetermined measurement temperature.

  According to the meshing transmission error measuring device of the present invention configured as described above, the constant temperature device warms the vehicle power transmission device during the measurement of the meshing transmission error, and the power transmission device is determined in advance. Therefore, by making the measured temperature the actual operating temperature of the vehicle power transmission device, the mesh transmission error at the actual operating temperature of the vehicle power transmission device can be measured with high accuracy. It is possible to accurately evaluate the meshing transmission error of the device.

  Here, the thermostatic device comprises: (c) an external circulation path that takes out the lubricating oil in the vehicle power transmission device to the outside and returns it to the vehicle power transmission device; and (d) is interposed in the external circulation path. An oil pump that is inserted and feeds the lubricating oil in the external circulation path in one direction, and (e) a radiator that is provided in the external circulation path and that air-cools the lubricating oil flowing through the external circulation path, and (f) A temperature on-off valve provided in series with the radiator and opening when the lubricating oil exceeds a predetermined temperature and increasing the amount of lubricating oil flowing through the radiator; and (g) in parallel with the radiator and the temperature on-off valve. And an electric heater that heats the lubricating oil when the lubricating oil falls below a predetermined temperature. In this way, since the lubricating oil in the vehicle power transmission device is maintained at a predetermined measurement temperature, the temperature of the entire gear mechanism in the vehicle power transmission device becomes uniform, so that the meshing transmission error Can be measured with high accuracy, and the meshing transmission error of the vehicle power transmission device can be accurately evaluated.

  Preferably, the meshing transmission error measuring device includes: (h) a rotation input shaft that transmits the rotation of the measurement drive source to the input member of the power transmission device; and (i) a connection to the output member of the power transmission device. A rotary output shaft, an input-side rotary encoder that detects the rotation of the rotary input shaft, and (j) an output-side rotary encoder that detects the rotation of the rotary output shaft. The encoder is connected to the input shaft via a heat insulating material, and the output rotary encoder is connected to the output shaft via a heat insulating material. In this way, since the rotary encoder, which is a precise device for measuring with high accuracy, is insulated from the vehicle power transmission device, the mesh transmission error can be measured with high accuracy, and the vehicle power transmission device can be measured. It is possible to accurately evaluate the meshing transmission error.

  Preferably, (l) the rotor of the input-side rotary encoder has its rotational input via a ceramic adapter that is concentrically connected to the rotational input shaft and has a lower thermal expansion coefficient than the rotational input shaft. (M) the rotor of the output-side rotary encoder is connected to the rotary output shaft concentrically with the rotary output shaft via a ceramic adapter having a lower coefficient of thermal expansion than the rotary output shaft. It is connected to. In this way, since the rotary encoder, which is a precise device for measuring with high accuracy, is insulated from the vehicle power transmission device, the mesh transmission error can be measured with high accuracy, and the vehicle power transmission device can be measured. It is possible to accurately evaluate the meshing transmission error.

  Preferably, (n) the rotor of the input-side rotary encoder is connected to the rotary input shaft via an adapter and a heat insulating plate concentrically connected to the rotary input shaft, and (o) the output-side rotary encoder The encoder rotor is connected to the rotation output shaft via an adapter and a heat insulating plate concentrically connected to the rotation output shaft. In this way, since the rotary encoder, which is a precise device for measuring with high accuracy, is insulated from the vehicle power transmission device, the mesh transmission error can be measured with high accuracy, and the vehicle power transmission device can be measured. It is possible to accurately evaluate the meshing transmission error.

It is the schematic explaining the structure of the meshing transmission error measuring apparatus to which this invention was applied. It is the schematic explaining the structure of the thermostat of FIG. It is the schematic explaining the attachment structure of the rotary encoder of FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a schematic diagram illustrating a configuration of a meshing transmission error measuring device 10 of a vehicle power transmission device to which the present invention is applied. In the meshing transmission error measuring device 10 of FIG. 1, a transaxle 12 is fixed as a vehicle power transmission device for measuring the meshing transmission error. A gear mechanism is accommodated in the transaxle 12. For example, the transaxle 12 includes a plurality of sets of planetary gear devices, and a plurality of friction engagement devices connect any of the rotating elements of the planetary gear devices to each other or to a case, so that a plurality of speed stages are achieved. The planetary gear type automatic transmission that achieves this alternatively, power transmission by a plurality of pairs of constantly meshing gears with different gear ratios provided on mutually parallel shafts is alternatively selected by a synchronous meshing device. A transmission 14 composed of either a parallel shaft transmission or a belt-type continuously variable transmission in which a transmission belt is wound around a pair of variable pulleys having a variable effective diameter, and an output torque of the transmission 14 And a differential gear device (final reduction gear) 16 for transmitting the power to the pair of left and right drive wheels.

  The meshing transmission error measuring device 10 has a rotational load on the input side motor 20 and the input side speed reducer 22 that function as a measurement drive source for rotating the input member of the transaxle 12, and a pair of output members of the transaxle 12. A first output side electric motor (generator) 24 and a first output side speed reducer 26, a second output side electric motor (generator) 28 and a second output side speed reducer 30 for applying a load torque are provided.

  Between the input member of the transaxle 12, that is, the input shaft (input shaft) of the transmission 14, and the input-side speed reducer 22, a belt-type transmission 31, an input-side torque meter 32, and an input-side rotary encoder 34 are used. It is connected by a rotary input shaft 36 composed of a relatively thin steel rod so as to function as a torsion bar. The rotation input shaft 36 is for causing the input member of the transaxle 12 to input the rotation from the input side electric motor 20 and the input side reduction gear 22 that function as a measurement drive source when measuring the meshing transmission error. A first output-side torque meter 38 and a first output-side rotary encoder 40 are connected between the output member of the transaxle 12, that is, one of the pair of side gears of the differential gear device 16 and the first output-side speed reducer 26. Are connected by a first rotation output shaft 42 composed of a relatively thin steel rod so as to function also as a torsion bar, and the other of the pair of side gears of the differential gear device 16 and the second output reduction gear 30. The second output side torque meter 44 and the second output side rotary encoder 46 are connected to each other by a second rotary output shaft 48 constituted by a relatively thin steel rod so as to function also as a torsion bar. Yes.

  The meshing transmission error measuring device 10 includes a thermostatic device 50 for heating the transaxle 12 and maintaining the transaxle 12 at a predetermined measurement temperature during measurement of the meshing transmission error. FIG. 2 shows an example of the thermostatic device 50. In FIG. 2, the thermostatic device 50 takes out the lubricating oil in the transaxle 12 to the outside and returns it to the transaxle 12 again, and is inserted into the external circulation path 52 and the external circulation path 52. An oil pump 54 that feeds the lubricating oil in one direction, an external circulation path 52, a radiator 56 that air-cools the lubricating oil flowing through the external circulation path 52, and a radiator 56 that are provided in series, A temperature on / off valve (thermostat) 58 that is a flow control valve that opens when the lubricating oil in the radiator 56 and the external circulation path 52 exceeds a predetermined target temperature and increases the amount of lubricating oil flowing through the radiator 56, and the radiator 56 and a temperature opening / closing valve 58, and an electric heater for heating the lubricating oil when the lubricating oil falls below a predetermined temperature. And a temperature control device 64 for controlling the electric heater 60 so that the lubricating oil temperature from the temperature sensor 62 provided in the external circulation path 52 becomes a preset target temperature. As a result, when the lubricating oil temperature in the external circulation path 52 exceeds the target temperature, it is cooled by the radiator 56, and when the lubricating oil temperature in the external circulation path 52 attempts to fall below the target temperature, it is heated by the electric heater 60. As a result, the lubricating oil in the transaxle 12 and the external circulation path 52 is kept constant near the target temperature. This target temperature becomes the measured temperature during the measurement of the meshing transmission error. This measured temperature is set to an actual operating temperature of the transaxle 12 of about 80 ° C., for example.

  Since the input-side rotary encoder 34, the first output-side rotary encoder 40, and the second output-side rotary encoder 46 are similarly composed of precision instruments having high resolution, in order to maintain the measurement accuracy, for example, 50 Although it can be used only at a temperature of less than or equal to ° C., it is provided at a position close to the transaxle 12 in order to reduce the influence of shaft twist. The input-side rotary encoder 34, the first output-side rotary encoder 40, and the second output-side rotary encoder 46 are mounted with a similar heat insulating structure so that heat conducted from the transaxle 12 is cut off. . For example, using the input-side rotary encoder 34, as shown in FIG. 3, the shaft end portion of the rotary input shaft 36a on the transaxle 12 side is relatively less than 1/10 of the steel rotary input shaft 36a. A connecting flange 70 made of zirconia ceramics having low thermal conductivity is fixed, and a boss member 72 having a tapered outer peripheral surface 72t is fixed to the shaft end portion of the rotary input shaft 36b on the input side torque meter 32 side. The connecting flange 70 is concentrically fixed to the boss member 72 by a bolt 74 via a heat insulating sheet 76. The rotor 34r of the input side rotary encoder 34 has a tapered inner peripheral surface 34t, and the tapered outer peripheral surface 72t is fitted on the tapered inner peripheral surface 34t by press fitting. The connecting flange 70 functions as an adapter for connecting the rotor 34r of the input side rotary encoder 34 and the rotary input shaft 36a on the transaxle 12 side. The connecting flange 70 and the heat insulating sheet 76 function as a heat insulating material that prevents the heat on the transaxle 12 side from being conducted to the input side rotary encoder 34. Thereby, a space is formed between the shaft end of the rotary input shaft 36a on the transaxle 12 side and the boss member 72, and the heat on the transaxle 12 side is exclusively input to the input side via the connecting flange 70 having a low thermal conductivity. Conducted to the rotary encoder 34.

  The meshing transmission error measuring device 10 configured as described above is controlled by an electronic control device 80. In a state where the transaxle 12 is maintained at a predetermined actual temperature by the constant temperature device 50, the electronic control unit 80 simultaneously drives the input member of the transaxle 12 to rotate at a predetermined low speed using the input side electric motor 20. The first output side motor 24 and the second output side motor 28 are used to apply a load torque necessary for meshing transmission error measurement to the output member of the transaxle 12. When measuring the meshing transmission error in the actual torque transmission state of the transaxle 12, a load torque set to generate the actual torque is applied. At this time, the input torque to the input member of the transaxle 12 is detected by the input side torque meter 32, and the output torque from the output member of the transaxle 12 is detected by the first output side torque meter 38 and the second output side torque meter 44. Thus, the electronic control unit 80 controls the input side motor 20, the first output side motor 24, and the second output side motor 28 so that the detected torque matches a predetermined test condition.

  During the rotation of the input member and the output member of the transaxle 12, the electronic control unit 80 detects the rotation speed (rotation angle) detected by the input-side rotary encoder 34, the first output-side rotary encoder 40, and the second output. After the rotational speed is matched using the speed ratio γ of the transaxle 12 at that time from the rotational speed (rotational angle) detected by the side rotary encoder 46, the phase shift of each rotational angle From the above, the meshing transmission error is calculated.

  As described above, according to the meshing transmission error measuring device 10 of the present embodiment, the temperature control device 50 heats the transaxle 12 during the measurement of the meshing transmission error, and the transaxle 12 is measured at a predetermined measurement temperature. Therefore, by setting the measured temperature to the actual operating temperature of the transaxle 12, the meshing transmission error at the actual operating temperature of the transaxle 12 can be measured with high accuracy, and the meshing transmission error of the transaxle 12 can be measured. Can be accurately evaluated.

  Further, in the meshing transmission error measuring device 10 of the present embodiment, the thermostatic device 50 includes an external circulation path 52 that takes out the lubricating oil in the transaxle 12 to the outside and returns it to the transaxle 12 again, and the external circulation path 52. An oil pump 54 that is inserted into the external circulation path 52 to feed the lubricating oil in the external circulation path 52 in one direction, and a radiator 56 that is provided in the external circulation path 52 and that air-cools the lubricating oil that flows through the external circulation path 52; A temperature on / off valve 58 provided in series with the radiator 56, which opens when the lubricating oil exceeds a predetermined temperature and increases the amount of lubricating oil flowing through the radiator 56; the radiator 56 and the temperature on / off valve 58; An electric heater 60 provided in parallel to heat the lubricating oil when the lubricating oil falls below a predetermined temperature. Since the lubricating oil in the axle 12 is maintained at a predetermined measurement temperature, the temperature of the entire gear mechanism in the transaxle 12 becomes uniform, so that the meshing transmission error can be measured with high accuracy, and the transaxle can be measured. It is possible to accurately evaluate the twelve meshing transmission errors.

  Further, the meshing transmission error measuring device 10 of this embodiment is provided with a rotation input shaft 36 that transmits the rotation of the input side motor 20 that is a measurement drive source to the input member of the transaxle 12, and an output member of the power transmission device. The first rotation output shaft 42 and the second rotation output shaft 48 that are connected, the input-side rotary encoder 34 that detects the rotation of the rotation input shaft 36, and the first rotation output shaft 42 and the second rotation output shaft 48. A first output-side rotary encoder 40 that detects rotation, and a second output-side rotary encoder 46, and the input-side rotary encoder 34 is on the transaxle 12 side via a heat insulating material (connection flange 70 and / or heat insulating sheet 76). Similarly, the first output-side rotary encoder 40 and the second output-side rotary encoder 46 are connected to the rotary input shaft 36a via a heat insulating material. Since it is connected to the first rotation output shaft 42 and the second rotation output shaft 48, the input-side rotary encoder 34, the first output-side rotary encoder 40, and the second output, which are precision devices for measuring with high accuracy, are used. Since the side rotary encoder 46 is insulated from the heat due to the actual operating temperature of the transaxle 12, the mesh transmission error can be measured with high accuracy, and the mesh transmission error of the transaxle 12 can be accurately evaluated.

  As mentioned above, although the Example of this invention was described in detail based on drawing, this invention is applied also in another aspect.

  For example, in FIG. 3 of the meshing transmission error measuring device 10 described above, in order to suppress heat conduction from the transaxle 12 at the actual operating temperature to the input side rotary encoder 34, a connecting flange 70 made of zirconia ceramics having a relatively low thermal conductivity. In addition, although the heat insulating sheet 76 is used, one of them may have a heat insulating property. For example, when the connecting flange 70 made of zirconia ceramics having a relatively low thermal conductivity is used, the heat insulating sheet 76 may not necessarily be used. When the heat insulating sheet 76 is used, the metal connecting flange 70 is not provided. May be used.

  Further, in the above-described meshing transmission error measuring device 10, the meshing transmission error of the transaxle 12 used in the front wheel drive type vehicle has been measured. Instead, a transmission used in the rear wheel drive type vehicle, for example, automatic shift A gear pair including a gear, a manual transmission, a continuously variable transmission, a differential gear device for a rear wheel, or a drive pinion and a ring gear meshing with the drive pinion may be used. Further, the gear mechanism provided in these transmissions may be a gear of another aspect such as a spur gear, a bevel gear, and a hypoid gear.

  Further, in the meshing transmission error measuring apparatus 10 described above, the input side motor 20 and the input side speed reducer 22, the first output side motor 24 and the first output side speed reducer 26, the second output side motor 28 and the second output side speed reducer. The machines 30 are separated from each other, but may be integrated, and the first output side motor 24 and the second output side motor 28 may be electromagnetic brakes.

  The above description is only an embodiment, and the present invention can be implemented in variously modified and improved forms based on the knowledge of those skilled in the art.

10: Meshing transmission error measuring device 12: Transaxle (vehicle power transmission device)
20: Input side motor (measuring drive source)
34: Input side rotary encoder (rotary encoder)
36: Rotation input shaft 40: First output-side rotary encoder (rotary encoder)
42: 1st rotation output shaft 46: 2nd output side rotary encoder (rotary encoder)
48: second rotation output shaft 50: constant temperature device 52: external circulation path 54: oil pump 56: radiator 58: temperature on / off valve 60: electric heater 70: connecting flange (heat insulating material, adapter)
76: Heat insulation sheet (heat insulation)

Claims (5)

The meshing transmission error of the power transmission device mounted on the vehicle and outputting the rotation input from the driving force source of the vehicle via the gear mechanism is based on the rotation of the input member and the rotation of the output member of the power transmission device. A meshing transmission error measuring device for a vehicle power transmission device,
A meshing transmission error of a vehicle power transmission device, comprising: a constant temperature device that warms the power transmission device and maintains the power transmission device at a predetermined measurement temperature during measurement of the meshing transmission error. measuring device. The thermostat is
An external circulation path for taking out the lubricating oil in the vehicle power transmission device to the outside and returning it to the vehicle power transmission device again;
An oil pump that is inserted into the external circuit and sends out the lubricating oil in the external circuit in one direction;
A radiator which is provided in the external circulation path and air-cools the lubricating oil flowing through the external circulation path;
A temperature on-off valve that is provided in series with the radiator and that opens when the lubricating oil exceeds a predetermined temperature and increases the amount of lubricating oil that flows through the radiator;
The mesh transmission error measuring device according to claim 1, further comprising: an electric heater provided in parallel with the radiator and the temperature on-off valve and heating the lubricating oil when the lubricating oil falls below a predetermined temperature. . A rotation input shaft for transmitting the rotation of the measurement drive source to the input member of the power transmission device, a rotation output shaft connected to the output member of the power transmission device, and an input-side rotary for detecting the rotation of the rotation input shaft An encoder, and an output-side rotary encoder that detects rotation of the rotary output shaft,
3. The vehicle according to claim 1, wherein the input-side rotary encoder is connected to the input shaft via a heat insulating material, and the output-side rotary encoder is connected to the output shaft via a heat insulating material. A gear transmission error measuring device for a power transmission device. The rotor of the input-side rotary encoder is connected to the rotary input shaft through an adapter made of ceramics that is concentrically connected to the rotary input shaft and has a lower coefficient of thermal expansion than the rotary input shaft,
The rotor of the output-side rotary encoder is connected to the rotary output shaft via an adapter made of ceramics that is concentrically connected to the rotary output shaft and has a lower coefficient of thermal expansion than the rotary output shaft. A meshing transmission error measuring device for a vehicle power transmission device according to claim 3. The rotor of the input-side rotary encoder is connected to the rotary input shaft via an adapter and a heat insulating plate concentrically connected to the rotary input shaft,
4. The vehicle power transmission device according to claim 3, wherein the rotor of the output-side rotary encoder is connected to the rotary output shaft via an adapter and a heat insulating plate concentrically connected to the rotary output shaft. Meshing transmission error measuring device.

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