JP2018179796A - Balance measurement device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a balance measurement device capable of measuring balance in a condition close to actual usage.SOLUTION: A balance measurement device is for measuring propeller shaft balance, and comprises a first support for supporting a first portion of a propeller shaft, a second support for supporting a second portion of the propeller shaft, a drive unit for turning the propeller shaft, and a controller configured to provide control for varying at least either of the rate of rotation and torque of the propeller shaft under balance measurement.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a propeller shaft balance measuring device.

  Conventionally, if the propeller shaft mounted on a vehicle is not balanced (in other words, dynamic equilibrium), vibrations, noise, noise, etc. (hereinafter simply referred to as "vibration") occur with the propeller shaft as an earthquake source. It is known to do. Such vibrations can be reduced by adjusting the balance of the propeller shaft.

  Patent Document 1 discloses a balance measuring device that measures the balance of a propeller shaft. In such a balance measuring device, the propeller shaft is rotated by the drive device while supporting both ends of the propeller shaft. If the propeller shaft is unbalanced, vibrations due to this imbalance occur. The above-described balance measuring device measures the amount, direction, etc. of unbalance of the propeller shaft based on such vibration. Then, the balance of the propeller shaft is adjusted based on the measurement result.

JP 2000-81360 A

  By the way, even if the propeller shaft is balanced based on the result of the balance measurement due to the difference between the use state of the propeller shaft (for example, while the vehicle is traveling) and the state of the propeller shaft during the balance measurement The vibration of the propeller shaft may not be reduced in the use condition.

  An object of the present invention is to provide a balance measuring device capable of measuring the balance of a propeller shaft in a state close to use.

  One aspect of the balance measuring device of the present invention is a balance measuring device for measuring the balance of a propeller shaft, comprising: a first support portion for supporting a first portion of the propeller shaft; and a second portion for the propeller shaft. A second support portion, a drive portion for rotating the propeller shaft, and a control portion for performing control to change at least one of the rotational speed and the torque of the propeller shaft during balance measurement are provided.

  According to the balance measuring device of the present invention, the balance of the propeller shaft can be measured in a state close to use.

The schematic block diagram which shows the balance test device which concerns on Embodiment 1 of this invention. Graph showing the relationship between the number of revolutions of propeller shaft and time during measurement Graph showing relationship between propeller shaft torque and time during measurement The schematic block diagram which shows the balance test device which concerns on Embodiment 2 of this invention Graph showing the relationship between the number of revolutions of propeller shaft and time during measurement Graph showing relationship between propeller shaft torque and time during measurement Graph showing the relationship between the number of revolutions of propeller shaft and time during measurement Graph showing relationship between propeller shaft torque and time during measurement

  The balance test apparatus according to at least some embodiments of the present invention will now be described with reference to the drawings. Each embodiment described below is an example of a balance test device concerning the present invention, and the present invention is not limited by an embodiment.

[1. About Embodiment 1]
The configuration of the balance measuring device 1 according to the present embodiment will be described with reference to FIGS. FIG. 1 is a schematic configuration view showing a balance measuring device 1 according to the present embodiment.

  FIG. 2A is a graph showing the relationship between the number of revolutions of the propeller shaft 2 and time during balance measurement. FIG. 2B is a graph showing the relationship between torque of the propeller shaft 2 and time during balance measurement.

[1.1 Overview of Balance Measurement Device]
First, the outline of the balance measuring device 1 according to the present embodiment will be described with reference to FIG. The balance measuring device 1 according to the present embodiment is a balance measuring device that measures the balance of a propeller shaft (for example, the propeller shaft 2), and supports the first part of the propeller shaft (for example, one end of the propeller shaft 2) A second support (for example, a second support described later) that supports a first support (for example, a first support 14a described later) and a second portion of the propeller shaft (for example, the other end of the propeller shaft 2) Control for changing at least one of the part 14b), a drive part (for example, the first drive part 13a to be described later) which rotates the propeller shaft, the number of revolutions of the propeller shaft and the torque of the propeller shaft And a unit (a first control unit 16a described later).

[1.2 About propeller shaft]
Next, an example of a propeller shaft whose balance can be measured by the balance measuring device 1 of the present embodiment will be briefly described. The balance measuring device 1 measures, for example, the balance of the propeller shaft 2 as shown in FIG. In FIG. 1, the propeller shaft 2 is assembled to the balance measuring device 1 in a horizontal state.

  The propeller shaft 2 is incorporated into, for example, a large vehicle such as a truck. However, the propeller shaft is not limited to a large vehicle, and may be, for example, a propeller shaft incorporated in various vehicles such as passenger cars.

  The propeller shaft 2 shown in FIG. 1 has a first shaft 21 and a second shaft 22. A female spline (not shown) formed at the end (left end in FIG. 1) of the first shaft 21 and a male spline (not shown) formed at the end (right end in FIG. 1) of the second shaft 22 Omitted) is in spline engagement.

  In this manner, the first shaft 21 and the second shaft 22 are assembled so as to transmit torque and allow relative displacement (i.e., expansion and contraction) in the axial direction (left and right direction in FIG. 1). In addition, a propeller shaft is not limited to the structure shown in FIG. 1, For example, the propeller shaft comprised by one shaft may be sufficient.

[1.3 Specific Configuration of Balance Measurement Device]
Next, with reference to FIG. 1, a specific configuration of the balance measuring device 1 according to the present embodiment will be described. The balance measurement device 1 includes a base 11, a first drive unit 13a, a first support 14a, a second support 14b, and a first controller 16a.

  The base 11 is fixed to, for example, a floor of a factory. The first housing 12 a is mounted on the upper surface of the base 11.

  The first drive portion 13 a is for rotating the propeller shaft 2. The first drive unit 13a can change the rotational speed or the torque of the propeller shaft 2 under the control of the first control unit 16a described later. The first drive unit 13a may maintain at least one of the rotational speed and the torque of the propeller shaft 2 constant under the control of the first control unit 16a. Such a first drive unit 13a includes, for example, an inverter, an electric motor, and the like, and is disposed in the internal space of the first housing 12a.

  The first rotation shaft 15a is connected to a main shaft (not shown) of the first drive unit 13a so as to be integrally rotatable with the main shaft. The tip end portion (right end portion in FIG. 1) of the first rotation shaft 15a is disposed in the external space of the first housing 12a.

  The first support portion 14a supports one end (the left end in FIG. 1) of the propeller shaft 2 disposed horizontally. The first support portion 14a is, for example, a chuck device, and is fixed to a tip end portion (right end portion in FIG. 1) of the first rotation shaft 15a. In the case of the present embodiment, one end of the propeller shaft 2 is a first portion. However, the first portion is not limited to one end of the propeller shaft 2.

  In the case of the present embodiment, the propeller shaft 2 supported by the first support portion 14a is rotatable integrally with the main shaft of the first drive portion 13a and the first rotation shaft 15a. In addition, since various conventionally known chuck devices can be adopted as the first support portion 14a, detailed description will be omitted.

  The second support portion 14 b supports the other end (right end in FIG. 1) of the propeller shaft 2 disposed horizontally. The second support portion 14 b as described above is opposed to the first support portion 14 a in the horizontal direction (left and right direction in FIG. 1). The second support 14 b is also, for example, a chuck device and is supported by the base 11 directly or through other members. In the case of the present embodiment, the other end of the propeller shaft 2 is a second portion. However, the second portion is not limited to the other end of the propeller shaft 2. The second part may be a part different from the first part.

  In the case of the present embodiment, the second support portion 14 b supports the other end of the propeller shaft 2 so as to be rotatable relative to the base 11. That is, the second support portion 14 b supports the other end of the propeller shaft 2 in a state where a substantial rotational resistance (in other words, resistance torque) is not applied to the rotating propeller shaft 2.

  Specifically, the second support portion 14 b is supported by the base 11 via a rolling bearing. The second support portion 14 b may be fixed to the base 11 in a non-rotatable state. In this case, the propeller shaft 2 is supported by the second support portion 14b via the rolling bearing.

  The first control unit 16a controls each of the functional units included in the balance measuring device 1, and includes a CPU, a ROM, a RAM, an input port, an output port, and the like.

The first control unit 16 a controls the first drive unit 13 a to change the rotational speed of the propeller shaft 2 when measuring the balance of the propeller shaft 2 by the balance measurement device 1. Specifically, at the time of balance measurement, the first control unit 16a changes the rotational speed of the propeller shaft 2 at a predetermined cycle T ₁ (that is, a predetermined frequency F ₁ ) and an amplitude A ₁ . The drive unit 13a is controlled. Therefore, the propeller shaft 2 is measured in balance in a state in which the rotational speed of the propeller shaft 2 fluctuates.

FIG. 2A is a graph showing the relationship between the number of revolutions of the propeller shaft 2 and time during balance measurement. As shown in FIG. 2A, the rotational speed of the propeller shaft 2 depicts a predetermined rotational speed _N 1 (rpm) reference the period _{T 1} and the waveform of the amplitude _{A 1} of the.

In the case of the present embodiment, the waveform of the rotational speed of the propeller shaft 2 is configured by a waveform consisting of a single cycle T ₁ (that is, frequency F ₁ ). However, the waveform of the rotation speed of the propeller shaft 2 may be a composite waveform of a plurality of waveforms having different periods (that is, different frequencies). Moreover, the waveform of the rotation speed of the propeller shaft 2 is not limited to a sine wave as shown in FIG. 2A, and may be, for example, a rectangular wave. Furthermore, the waveform of the rotational speed of the propeller shaft 2 may be randomly varied.

Period T ₁ of the above can be determined, for example, based on the number of cylinders an engine of a vehicle propeller shaft 2 is mounted. That is, the period T ₁ may be periodic with period a correlation between the rotation fluctuation of the engine (torque variation). Other, period T ₁ may be a period with at least one change and correlation among various variations acting on the propeller shaft 2 during running of the vehicle. Thereby, the balance measurement can be performed under conditions close to the use state (for example, while the vehicle is traveling).

  On the other hand, the first control unit 16a controls the first drive unit 13a such that the torque applied to the propeller shaft 2 from the first drive unit 13a becomes constant. Therefore, in the case of the present embodiment, the propeller shaft 2 is measured for balance under constant torque. The relationship between torque applied to the propeller shaft 2 and time during balance measurement is as shown in FIG. 2B.

[1.4 Regarding the operation and effect of the present embodiment]
According to the balance measuring device 1 of the present embodiment having the configuration as described above, the balance can be measured in a state close to a use state (for example, a traveling state of a vehicle). The reason will be described below. When the propeller shaft 2 is in use, it is known that the rotation, torque, etc. of the propeller shaft 2 fluctuate. As a cause of such fluctuation, for example, engine rotation fluctuation (torque fluctuation) and the like can be mentioned. In the case of the balance measuring device 1 according to the present embodiment, the balance measurement can be performed in a state where the rotational fluctuation having a correlation with these various fluctuations is added to the propeller shaft 2. Therefore, the balance measurement of the propeller shaft 2 can be performed in a state close to the traveling state of the vehicle as compared with the case where the rotational fluctuation is not applied. And if balance adjustment of the propeller shaft 2 is performed based on the measurement result of the balance measuring apparatus 1 of this embodiment, the vibration of the propeller shaft 2 in use condition can be reduced. As the balance adjustment method, various methods conventionally known can be adopted, and therefore the description thereof is omitted.

  In particular, in the case of the propeller shaft 2 shown in FIG. 1, the engagement state of the spline engaging portion settles closer to the use state when rotational fluctuation is added. In other words, it is possible to perform balance measurement in a state in which the spline engaging portion is well seated (in other words, in a state in which the backlash of the spline engaging portion is small) by adding rotational fluctuation. As a result, the vibration of the propeller shaft 2 in use can be reduced more effectively.

[2. Embodiment 2]
The balance measuring device 1a according to the second embodiment will be described with reference to FIG. In addition, the balance measuring device 1a of this embodiment can be implemented in combination with the above-mentioned Embodiment 1 in the range which is not technically contradictory.

  The balance measuring device 1a of the present embodiment includes a torque applying unit (second drive unit 13b described later, which applies torque to the rotating propeller shaft 2), and a control unit (a first control unit 16a and a later described The second control unit 16b) controls the drive unit (the first drive unit 13a) so that the number of revolutions of the propeller shaft becomes constant, and the torque (hereinafter referred to as "fluctuating torque") that fluctuates in the propeller shaft The torque application unit is controlled to apply the torque.

  Hereinafter, the balance measuring device 1a of the present embodiment will be described focusing on a structure different from the balance measuring device 1 of the above-described first embodiment.

  In the case of the balance measuring device 1a of the present embodiment, the first housing 12a and the second housing 12b are mounted on the upper surface of the base 11. The first housing 12a is similar to that of the first embodiment described above.

  A second drive unit 13 b and a second control unit 16 b are disposed in the internal space of the second housing 12 b.

  The second drive unit 13 b is a torque applying unit, and is for applying to the propeller shaft 2 a fluctuating torque that is a rotational resistance of the propeller shaft 2. The fluctuation torque will be described later.

  In the case of this embodiment, the second drive unit 13 b is configured to include an electric motor and the like. The second rotation shaft 15 b is connected to a main shaft (not shown) of the second drive unit 13 b so as to be integrally rotatable with the main shaft. The tip end portion (lower end portion in FIG. 3) of the rotation shaft 15b is disposed in the external space of the second housing 12b.

  The second drive unit 13 b can apply a torque serving as a brake to the rotating propeller shaft 2. The second drive unit 13 b may apply a torque that accelerates the rotation of the propeller shaft 2 to the propeller shaft 2 that is rotating. Further, the torque applying unit is not limited to the case of the present embodiment, and may have a structure in which periodical frictional resistance is applied to the other end of the propeller shaft 2, for example.

  In the case of the present embodiment, the second support portion 14b is fixed to the tip end portion (left end portion in FIG. 3) of the second rotation shaft 15b. The rotation (in other words, torque) of the second drive portion 13b is transmitted to the propeller shaft 2 via the second support portion 14b.

  In the case of the present embodiment, the first control unit 16a controls the first drive unit 13a so that the number of revolutions of the propeller shaft 2 becomes constant at a predetermined number of revolutions (rpm). Further, the first control unit 16a controls the first drive unit 13a so that the torque transmitted from the first drive unit 13a to the propeller shaft 2 becomes constant.

  The second control unit 16 b controls each of the functional units included in the balance measuring device 1 a, and includes a CPU, a ROM, a RAM, an input port, an output port, and the like.

  The second control unit 16b controls the second drive unit 13b to apply the varied torque to the propeller shaft 2 when the balance measurement of the propeller shaft 2 is performed by the balance measurement device 1a.

Specifically, at the time of balance measurement, the second control unit 16 b changes the number of revolutions of the main shaft of the second drive unit 13 b at a predetermined cycle T ₂ (that is, a predetermined frequency F ₂ ) and an amplitude A ₂ . The rotation of the main shaft of the second drive portion 13b is transmitted to the propeller shaft 2 via the second rotation shaft 15b and the second support portion 14b.

  With the above-described configuration, in the case of the present embodiment, the relationship between the number of revolutions of the propeller shaft 2 and the time during balance measurement is as shown in FIG. 4A. On the other hand, the relationship between the torque applied to the propeller shaft 2 and the time during the balance measurement is as shown in FIG. 4B.

  As described above, in the case of the present embodiment, since the balance measurement is performed in a state in which the rotational speed of the propeller shaft 2 is constant and the torque of the propeller shaft 2 fluctuates, the first shaft 21 and the second shaft 22 are centered It will be easier. The other structure, operation and effects are the same as those of the first embodiment described above.

[2.1 Appendix]
In the above description, the first control unit 16a and the second control unit 16b are different control units. However, as long as the function of the first control unit 16a and the function of the second control unit 16b are provided, the first control unit 16a and the second control unit 16b may be configured as one control unit.

[3. Embodiment 3]
The structure of the balance measurement device according to the third embodiment is the same as that of the balance measurement device 1a (see FIG. 3) of the second embodiment described above. However, in the case of the present embodiment, the functions of the first control unit 16a and the second control unit 16b are different from those of the above-described second embodiment.

  Hereinafter, with reference to FIG. 3, the balance measurement device of the present embodiment will be described focusing on the difference from the above-described second embodiment.

  In the case of the present embodiment, the first control unit 16 a performs the same control as that of the above-described first embodiment when measuring the balance of the propeller shaft 2. That is, the first control unit 16 a controls the first drive unit 13 a so as to change the rotational speed of the propeller shaft 2. Therefore, the relationship between the rotational speed of the propeller shaft 2 and time is as shown in FIG. 5A.

  On the other hand, the first control unit 16a controls the first drive unit 13a such that the torque applied to the propeller shaft 2 from the first drive unit 13a becomes constant.

  In the case of the present embodiment, the second control unit 16b performs the same control as that of the above-described second embodiment at the time of balance measurement. That is, the second control unit 16 b controls the second drive unit 13 b to apply the varied torque to the propeller shaft 2 at the time of the balance measurement. Therefore, the relationship between the torque of the propeller shaft 2 and time during the balance measurement is as shown in FIG. 5B.

  As described above, in the case of the present embodiment, the balance of the propeller shaft 2 is measured in a state in which the rotational speed and torque of the propeller shaft 2 fluctuate. The other structure, operation and effects are the same as those of the first embodiment described above.

  The present invention is applicable not only to large vehicles but also to balance measurement of propeller shafts incorporated in various vehicles such as passenger cars.

DESCRIPTION OF SYMBOLS 1 and 1a Balance measurement apparatus 11 Base 12a 1st housing 12b 2nd housing 13a 1st drive part 13b 2nd drive part 14a 1st support part 14b 2nd support part 15a 1st rotating shaft 15b 2nd rotating shaft 16a 1st control Part 16b Second control part 2 Propeller shaft 21 First shaft 22 Second shaft

Claims (5)

A balance measuring device for measuring the balance of a propeller shaft,
A first support that supports a first portion of the propeller shaft;
A second support portion supporting the second portion of the propeller shaft;
A drive unit for rotating the propeller shaft;
A control unit that performs control to change at least one of the number of rotations and the torque of the propeller shaft during balance measurement.   The balance measurement device according to claim 1, wherein the control unit controls the drive unit such that a rotation speed of the propeller shaft fluctuates. A torque applying unit for applying a torque to the propeller shaft being rotated;
The control unit controls the drive unit such that the number of revolutions of the propeller shaft is constant, and controls the torque applying unit to apply a varied torque to the propeller shaft. Balance measuring device. A torque applying unit for applying a torque to the propeller shaft being rotated;
The control unit controls the drive unit so that the number of revolutions of the propeller shaft varies, and controls the torque applying unit so as to apply the varied torque to the propeller shaft. Balance measuring device.   The balance measurement device according to any one of claims 1 to 4, wherein a fluctuation period of the rotation speed or torque of the propeller shaft is determined based on the number of cylinders of an engine of a vehicle on which the propeller shaft is mounted.

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