JPH08210949A - Inspection device and inspection method for constant velocity joint - Google Patents

Abstract

PURPOSE: To precisely inspect the quality by attaching a rotary encoder to each of input and output shafts, and detecting the rotating phase difference between the input and output shafts by the signal outputted from the rotary encoder. CONSTITUTION: An inspection device 10 is formed of a rotary encoder 22 attached to an input shaft 14; a rotary encoder 32 attached to an output shaft 24; an inverter motor 20 for rotating the input shaft 14; and an inverter motor 30 for applying a load to the output shaft 24. The phase difference signal showing the rotating phase difference between the input shaft 14 and the output shaft 24 is received from the output signals of the encoders 22, 32, the phase difference signal is decomposed to phase differences of a basic wave component to n-order higher harmonic component, and the total of the phase difference of a specified-order higher harmonic component and the phase difference of each following-order higher harmonic component other than the specified-order higher harmonic component is calculated. The quality of a constant velocity joint assembly 12 is judged depending on whether the total phase difference of the phase differences of the specified-order higher harmonic component and each following-order higher harmonic component other than the specified-order higher harmonic component is within a preset phase difference or not.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a constant velocity joint inspecting apparatus and method for inspecting transmissibility between an input shaft and an output shaft in a constant velocity joint used for transmitting an engine output of an automobile to driving wheels. Regarding the input shaft,
The present invention relates to a constant velocity joint inspecting apparatus and an inspecting method for calculating a phase difference from a rotation signal obtained from an encoder mounted on an output shaft.

[0002]

2. Description of the Related Art Constant velocity joints as shown in FIGS. 9A and 9B are used for transmitting the engine output of an automobile to driving wheels. This constant velocity joint includes an inner race 1 that is engaged with an input shaft that is a drive shaft on the engine output side, and an outer race 2 that is engaged with an output shaft on the drive wheel side.

The outer race 2 has n pieces (generally 6 pieces)
Track grooves 3 are provided, and a steel ball 6 is sandwiched in a groove portion 4 corresponding to the track groove 3 in the inner race 1 via a ball cage 5, and the inner race 1, the steel ball 6, and the ball cage 5 are assembled. The solid body is assembled by inserting the steel ball 6 into the outer race 2 so that the steel ball 6 fits into the track groove 3, the inner race 1 is engaged with the drive shaft on the engine output side, and the drive shaft is rotated through the inner race 1. Outer race 2
Is transmitted to the outer race 2, and the drive wheel engaged with the outer race 2 is rotated.

The combination accuracy in a state where the inner race 1 and the outer race 2 of such a constant velocity joint are combined (hereinafter referred to as a constant velocity joint assembly), that is, the transmissibility between the input shaft and the output shaft in the constant velocity joint. It is necessary to inspect and check the product quality, but heretofore, as this type of inspection method, Japanese Patent Laid-Open No. 1-259235 has been proposed.
There is a technique disclosed in Japanese Patent Laid-Open Publication No. 3-26934.

In any of the above-mentioned prior arts, the input shaft (drive shaft) engaged with the inner race 1 is rotated in a tilted state, and the torque fluctuation of the input shaft is measured to simply measure the constant velocity joint assembly. The quality of the product was determined by simply measuring the internal friction torque.

[0006]

The members such as the inner race 1 and the outer race 2 which constitute the constant velocity joint are generally manufactured by forging, and they are assembled with high processing accuracy without requiring a precise finishing process. The existence of slight variations in combination accuracy due to occasional burrs is inevitable.

However, in the above-mentioned conventional technique, the input shaft engaged with the inner race 1 is rotated, and the torque fluctuation of the input shaft is measured, so that the friction torque inside the constant velocity joint assembly is simply measured. Since the quality of the product was determined, if the clearance of the combination accuracy inside the constant velocity joint assembly including the steel balls 6 becomes large, the friction will be small due to the decrease in resistance, and the torque fluctuation will not occur. Therefore, there is a problem in that it may be judged as a non-defective product in the inspection process.

Further, in the above-mentioned prior art, the degree of clearance between the steel ball 6 and the track groove 3 in the constant velocity joint assembly, that is, the degree of the gap between the steel ball 6 and the track groove 3 is measured. Cannot be performed, and it is difficult to perform an accurate inspection (quality judgment) in a short time. Furthermore, when the workpiece (constant velocity joint assembly) that has been inspected and measured once again is measured again,
At the time of the first measurement, the steel ball 6 and the track groove 3 in the constant velocity joint assembly, which is the work, become compatible with each other in the process of the rotation operation, and the second measurement value is different from the first measurement value. However, the inconvenience of lack of reproducibility has been pointed out.

The present invention has been made in order to solve such a conventional problem, and has a structure in which a load equivalent to that during traveling of an automobile can be applied to the output shaft (outer race side) of the constant velocity joint assembly. , The rotary encoder is attached to each of the input shaft (inner race side) and the output shaft (outer race side), and the accuracy is obtained by detecting the rotational phase difference between the input shaft and the output shaft by the signals output from both rotary encoders. An object of the present invention is to provide an inspection device and an inspection method for a constant velocity joint, which can perform quality inspection well.

[0010]

In order to achieve the above object, according to the present invention, an inner race as an input shaft is fitted via a ball into a track groove provided in an outer race as an output shaft. In constant velocity joint inspection equipment,
An encoder mounted on the input shaft for detecting rotation of the input shaft, a drive source for rotating the input shaft, an encoder mounted on the output shaft for detecting rotation of the output shaft, and an output shaft for the output shaft. A load supply source for applying a load, a steering means for providing an arbitrary inclination angle between the input shaft and the output shaft, and a position indicating a rotational phase difference between the input shaft and the output shaft from output signals of the encoders. The phase difference signal is received, the phase difference signal is decomposed into the phase difference from the fundamental wave component to the nth harmonic component, the phase difference of the specific harmonic component of the order equal to the number of track grooves is calculated, and the specific difference is calculated. An encoder output analysis unit for calculating the total phase difference of the phase differences of the harmonic components of each order other than the next harmonic component, and the phase difference of the specific order harmonic component and the specific order calculated by the encoder output analysis unit. Other than harmonic components A phase difference calculation unit including an inspection / determination unit that determines the quality of the constant velocity joint depending on whether the total phase difference of the harmonic components of the order is within a preset phase difference range, It is characterized by having.

Further, the present invention is a method for inspecting a constant velocity joint in which an inner race as an input shaft is fitted through a ball into a track groove provided in an outer race as an output shaft. A step of engaging a rotary drive source, a step of engaging the output shaft with a load supply source, and a step of giving an arbitrary turning angle to the input shaft and the output shaft,
The rotary drive source applies arbitrary rotation to the input shaft, the load supply source applies arbitrary load to the output shaft, and the first and second encoders respectively mounted on the input shaft and the output shaft cause the input shaft Obtaining a rotation signal of the output shaft,
A step of calculating a rotation phase difference between the input shaft and the output shaft from a rotation signal obtained from the first and second encoders by the phase difference calculation unit, and a rotation phase difference calculated by the calculation unit Determining whether the constant velocity joint is good or bad depending on whether or not it is within a set predetermined phase difference range.

[0012]

In the constant velocity joint inspection device and inspection method according to the present invention, the input shaft and the output shaft are provided with encoders for detecting their rotations, respectively, and the input shaft is engaged with the rotary drive source. , Engage the output shaft with the load device,
Giving an arbitrary turning angle to the input shaft and output shaft.

When the rotary drive source applies arbitrary rotation to the input shaft and the load device applies arbitrary load to the output shaft, the rotation on the inner race side is transmitted to the outer race side. The rotation on the input shaft side and the rotation on the output shaft side are detected by the first and second encoders respectively mounted on the input shaft and the output shaft, and the rotation signals of the respective shafts are obtained.

The phase difference calculator obtains the phase difference between the input shaft and the output shaft from the rotation signals obtained from the first and second encoders, and extracts the fundamental wave component to the nth harmonic component from the phase difference. Decompose into phase difference, calculate the phase difference of the specific harmonic component of the order equal to the number of track grooves, further, the total phase difference from the phase difference of the harmonic component of each order other than the specific harmonic component To calculate.

In the inspection / determination unit, the phase difference of the specific harmonic components calculated by the phase difference calculating unit and the total phase difference of the harmonic components of each order other than the specific harmonic component are preset. The quality of the constant velocity joint is determined by whether or not it is within a predetermined phase difference range.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An inspection device and an inspection method for a constant velocity joint according to the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is a block diagram showing the structure of a constant velocity joint inspection apparatus 10 according to this embodiment.

In the constant velocity joint inspection apparatus 10, the input shaft (inner race side) 14 of the constant velocity joint assembly (CVJ) 12 is rotated by a rod mounting jig 16 and a wound timing belt. The input shaft 14 is engaged with an inverter motor 20 that supplies a rotation output corresponding to the engine output via the pulleys 18a and 18b.
Is provided with a rotary encoder 22 that produces an output signal according to the rotation thereof.

On the other hand, the output shaft (outer race side) 24 of the constant velocity joint assembly 12 is, like the input shaft 14, an outer mounting jig 26, a pulley 28a to which rotation is transmitted by a wound timing belt, and A rotary encoder 32 is provided on the output shaft 24, which is engaged with an inverter motor 30 for supplying a load equivalent to a load applied to the output shaft 24 via a vehicle 28b during traveling of the vehicle, and which produces an output signal according to the rotation of the output shaft 24. ing.

The control section 34 includes an inverter motor controller for controlling the inverter motor 20 and the inverter motor 30, and controls the inverter motor 20 to supply a rotation output corresponding to the engine output to the input shaft 14.
The inverter motor 30 is controlled so as to operate (function as a brake) to suppress the rotation of the output shaft 24 and supply the output shaft 24 with a load equivalent to that during traveling.

The control unit 34 also receives phase difference data detected based on the output signals of the rotary encoders 22 and 32 provided on the operation panel for operating the constant velocity joint inspection apparatus 10, the input shaft 14, and the output shaft 24. By processing, the difference in the number of rotations of the input shaft 14 and the output shaft 24, that is,
A sequence controller for inspecting the combination accuracy inside the constant velocity joint assembly 12 is included.

The outputs of the rotary encoders 22 and 32 are
The signals are supplied to the multiplying circuits 36a and 36b, respectively, and are multiplied.
The outputs of the rotary encoders 22, 32 multiplied by the multiplication circuits 36a, 36b are supplied to the phase difference detection circuit 38, and the phase difference detection circuit 38 outputs the rotary encoder 22,
The phase difference of the output of 32 is detected, the phase difference data corresponding to the detected phase difference is transmitted, and is input to the phase difference calculation unit 40. The phase difference calculation unit 40 is configured of, for example, a microprocessor and performs a process described below. The phase difference calculation unit 40 outputs a signal from the control unit 34 via the interface unit and a phase difference output from the phase difference detection circuit 38. data,
It is configured to receive a rotation speed setting signal output from a rotation speed setting device 48 that sets the rotation speed of the inverter motor 20 and the rotation speed of the inverter motor 30.

The phase difference calculator 40 includes a printer 42, C
Output devices such as the RT 44 and the plotter 46 are connected, and calculation results, inspection results, etc. can be output and displayed in various output forms. Further, a D / A conversion circuit 50 is connected to the phase difference detection circuit 38, and the phase difference data output from the phase difference detection circuit 38 can be analog-outputted.

FIG. 2 is a view showing the structure of the measuring section in the constant velocity joint inspection apparatus 10.

The constant velocity joint assembly 12 is assembled in such a manner that the inner race 52 and the outer race 54 are fitted with the steel balls 56 in the track grooves 55, and the input shaft 14 thereof has a rod mounting jig 16, pulleys 18a, 18.
A rotary encoder 2 that is engaged with an inverter motor 20 that supplies a rotation output corresponding to the engine output via b, and that produces an output signal corresponding to the rotation on the input shaft 14.
2 are provided.

On the other hand, similarly to the input shaft 14, the output shaft 24 is engaged with the inverter motor 30 which supplies the output shaft 24 with a load equivalent to that when the vehicle is running through the outer mounting jig 26 and the pulleys 28a and 28b. The rotary encoder 3 that produces an output signal corresponding to the rotation of the output shaft 24
2 are provided. The inverter motor 30 operates (functions as a brake) to suppress the rotation of the output shaft 24, and supplies the output shaft 24 with a load equivalent to that during traveling.

On the input shaft 14 side and the output shaft 24 side, inspection,
At the time of measurement, dampers 62a and 62b are provided at appropriate positions to absorb extra rotational vibration generated on each shaft by the inverter motors 20 and 30 which are drive sources. In the structure diagram of FIG. 2, the input shaft 14 and the output shaft 24 are shown in a tilted state, but this means that the driving wheels are steered when the vehicle is running, and the constant velocity joint assembly 12 is This is because the assembled state is inspected and measured, and the constant velocity joint inspection device 10 of the present invention is configured so that, for example, the steering angle can be changed from 0 ° to 50 °.

The rotation speed on the input shaft 14 side can be changed in the range of 0 rpm to 150 rpm by the inverter motor 20, and the load on the output shaft 24 side can be changed by the inverter motor 30 in the range of 0 kgm to 15 kg.
It can be changed up to m.

FIG. 3 is a block diagram showing the configuration of the phase difference calculation unit 40. The phase difference calculation unit 40 is basically composed of a microprocessor, and includes a CPU calculation unit 70,
ROM 72 that stores a program for performing comprehensive control of the CRT 44 that is a display unit and the phase difference calculation unit 40.
And a RAM 74 for temporarily storing the calculation result.

The phase difference calculator 40 also produces a phase difference signal based on the phase difference data obtained from the output signals of the rotary encoders 22 and 32 according to the rotation of the input shaft 14 and the output shaft 24 of the constant velocity joint assembly 12. An encoder output analysis unit 80 that decomposes into harmonic components from the fundamental wave to the nth harmonic and performs a predetermined calculation, and a constant velocity joint assembly 12 that is an object to be inspected based on the analysis result by the encoder output analysis unit 80. And an inspection / determination unit 82 for determining the quality of the product, and the encoder output analysis unit 80 and the inspection / determination unit 82 analyze the encoder output,
It is provided with a ROM 88 storing a program for calculation and a ROM 90 storing a program for inspecting the quality of the constant velocity joint assembly 12 and determining whether the product is good or bad.

The measuring section 76 outputs phase difference data output from the phase difference detecting circuit 38 via the interface 84 (hereinafter referred to as I / F 84), that is, the input shaft 14 and the output shaft 24 of the constant velocity joint assembly 12. It is configured to capture phase difference data created from an output signal corresponding to rotation, and is configured to capture a setting output from a rotation speed setter 48 that sets the rotation speeds of the inverter motors 20 and 30, and further. The sequence controller of the control unit 34 is configured to take in sequence control information of measurement, inspection, and determination in the constant velocity joint inspection device 10. In addition, the interface 92 (hereinafter, I /
An output device such as the printer 42 and the plotter 46 is connected to the F92), and is configured to output the processing result of the phase difference calculation unit 40 in a desired form.

Inspecting the constant velocity joint assembly 12 by the constant velocity joint inspecting apparatus 10 constructed as described above,
Take a measurement. For example, in the inspection and measurement by the constant velocity joint inspection device 10, the rotation speed on the input shaft 14 side is set to 6
Any constant value between 0 rpm and 120 rpm, output shaft 2
The load on the 4th side is set to an arbitrary constant value between 5 kgm and 10 kgm, and the steering angle is set to an arbitrary constant value between 20 ° and 40 °.

The rotation speed of the constant velocity joint assembly 12 on the input shaft 14 side, the load on the output shaft 24 side, the input shaft 14 and the output shaft 2
When the steering angle of No. 4 is set as described above and the inspection and measurement are performed by the constant velocity joint inspection device 10, the rotary encoders 22 and 32 mounted on the input shaft 14 and the output shaft 24 indicate the rotational speeds thereof. Output signal is obtained. The waveform of the phase difference signal S based on the phase difference data from the phase difference detection circuit 38 that receives the output from the multiplied rotary encoders 22 and 32 is basically a basic waveform as shown in the sine wave signal a in FIG. It is represented by a sine wave signal of a fundamental wave that becomes, but in practice, as can be seen from the case where the sine wave function is Fourier-transformed, the fundamental wave sine wave signal a has its second harmonic component The sine wave signal b has a complex signal waveform in which the sine wave signal c of the third harmonic component to the sine wave signal f of the sixth harmonic component to the sine wave signal of the n th higher harmonic component are combined.

Constant velocity joint inspection apparatus 1 according to this embodiment
The inspection method in 0 is the rotary encoders 22 and 32.
The phase difference signal based on the phase difference data obtained based on the output signal of is decomposed into the order (frequency) components from the fundamental wave component to the nth harmonic component, and the phase difference signal for each harmonic component is analyzed. However, a phase difference obtained from a specific harmonic component, more specifically, the constant velocity joint assembly 1
The phase difference obtained from the harmonic components of the order equal to or an integer multiple of the number of track grooves provided in the outer race 54 constituting the second component and the phase difference of the harmonic components of other orders are the constant velocity joint assembly 12 It was found that the same as the quality of the rotational speed transmissibility, and the phase difference calculation and inspection method using this property were applied.

Next, the method of inspecting, measuring, and determining the quality of the constant velocity joint assembly 12 by the constant velocity joint inspection device 10 will be described with reference to the block diagrams of FIGS. 1 and 3.
Will be described with reference to the structural diagram of FIG. 4, the waveform diagram of FIG. 4, the flowcharts of FIGS.

When the constant velocity joint inspection apparatus 10 is activated, step S1 of the schematic inspection flowchart shown in FIG.
, The constant velocity joint assembly 12, which is the object to be inspected, is conveyed to a predetermined position, and the rod mounting jig 16,
The input shaft 14 and the output shaft 2 are connected via the outer mounting jig 26.
4 is mounted and the axes are aligned (see the block diagram of FIG. 1 and FIG. 2).
(Refer to the structural diagram of), and then the set steering angle (tilt angle)
Accordingly, the angle between the input shaft 14 and the output shaft 24 is set (step S2).

Next, in steps S3 and S4, the rotational speed of the input shaft 14 is set (step S3) and the load of the output shaft 24 is set (step S4). Based on these settings, measurement and inspection in step S5 are performed. In, the inverter motor 20 is rotated, the input shaft 14 is rotated at the set rotation speed, the inverter motor 30 is rotated, and the output shaft 2 is rotated.
A rotational force is applied to the No. 4 in the braking direction (operating as a braking function), and a load similar to that when the vehicle is running is supplied to the output shaft for measurement.

That is, the rotation is detected by the rotary encoders 22 and 32 provided on the input shaft 14 and the output shaft 24, and the phase difference is calculated from the output signals of the rotary encoders 22 and 32 and the phase difference data of the phase difference detection circuit 38. Part 4
0, the rotational phase difference between the input shaft 14 and the output shaft 24 is calculated and evaluated by the method described later based on the measurement and inspection flowchart shown in FIG.

When the measurement and inspection are completed, the input shaft is returned (step S6) to restore the inclination angle (steering angle) of the input shaft 14 and the output shaft 24, and then the rod mounting jig 1
6, the outer mounting jig 26 to the input shaft 14, the output shaft 2
4 is removed, the input / output shafts are removed (step S7), and in step S8, the constant velocity joint assembly 1
2 is conveyed to complete the work. These processes are performed by the control unit 3
This is performed by operating the operation panel 4 or by operating each part of the constant velocity joint inspection device 10 according to the control sequence set in the sequence controller.

The processing of measurement and inspection is performed in the phase difference calculating section 40 according to the procedure shown in the flowchart of FIG. When the constant velocity joint assembly 12, which is the object to be inspected, is set in the constant velocity joint inspection device 10 and enters the measurement and inspection process (step S5 in FIG. 5), the rotary encoder installed on the input shaft 14 and the output shaft 24. Output pulses corresponding to the rotations of the input shaft 14 and the output shaft 24 are generated from 22 and 32 (step S10 in FIG. 6).

The output pulses of the rotary encoders 22 and 32 are multiplied by the multiplying circuits 36a and 36b, input to the phase difference detecting circuit 38, and the phase difference data is sent out. This phase difference data is transferred via the I / F 84 to the phase difference calculator 40.
Is input to the measuring unit 76 (see the block diagram of FIG. 3) (step S11).

As described above, the phase difference signal S based on the phase difference data is the sine wave signal a of the fundamental first harmonic,
Sine wave signal b of second harmonic component which is a harmonic, sine wave signal c of third harmonic component to sine wave signal f of sixth harmonic component
Is a signal obtained by combining sine wave signals of the nth harmonic component.

When the phase difference data output from the phase difference detection circuit 38 is input to the measuring section 76, the encoder output analyzing section 80 extracts the fundamental wave component to the nth harmonic from the phase difference signal based on this phase difference data. The phase difference of the wave component is decomposed (step S12), and then the phase difference of each harmonic component is calculated (step S13).

Next, the encoder output analysis unit 80 calculates the preset phase difference data of the m-th order harmonic component and the phase difference data of the non-m-th order harmonic component according to the processing program stored in the ROM 88. Yes (step S1
4, step S15). Here, the specific m-th order harmonic component is specifically a harmonic component of an order equal to the number of track grooves 55 provided in the outer race 54 of the constant velocity joint assembly 12, or an order of an integral multiple thereof. Since the number of track grooves 55 is six in this embodiment, it becomes a sixth-order harmonic component or a twelfth-order harmonic component.

FIG. 7 shows the fundamental wave components of the phase difference signal ~ n based on the phase difference data arithmetically processed by the encoder output analysis unit 80 as described above for a plurality of constant velocity joint assemblies 12 as the objects to be inspected. It is a graph which shows the phase difference in a second harmonic component. In the graph of FIG. 7, the horizontal axis represents frequency (order) and the vertical axis represents phase difference (degree). Figure 7
In (A), a large phase difference is observed not only in the specific mth (sixth) harmonic component but also in the second harmonic component.
It is understood that in (B), except for the specific m-th (6th) harmonic component, the phase difference is not large except for the fundamental component.

Here, when the result of the above arithmetic processing is compared with the assembling accuracy of the plurality of constant velocity joint assemblies 12 which are the objects to be inspected, the fundamental wave component is a shake component, and the constant velocity joint assembly is Most of the influences of the rod mounting jig 16 and the outer mounting jig 26 when mounting the three-dimensional body 12 on the test apparatus, and when excluded from the measurement and analysis, the phase difference of a specific m-th (6th) harmonic component When it becomes larger, the clearance between each track groove 55 and the steel ball 56 becomes larger evenly, and the specific mth order (6th order)
It was confirmed that when the phase difference of the harmonic components other than the above becomes large, the clearance between each track groove 55 and the steel ball 56 has a large difference between the track grooves 55.

From this, the constant velocity joint assembly 12
As a quality determination method of, as shown in the quality determination region of FIG. 8, the phase difference of a specific m-th (6th) harmonic component is a predetermined value or less (100 sec or less on the vertical axis), and R is a range in which the sum of the phase differences of the harmonic components other than the specific m-th order (sixth order) is a predetermined value or less (200 seconds or less on the horizontal axis).
The phase difference between the fundamental wave component and the nth harmonic component of the phase difference pulse is calculated by the encoder output analysis unit 80, and the phase difference of the specific mth (6th) harmonic component and the specific m is set. The sum of the phase differences of the harmonic components other than the next (sixth) component is calculated, and the inspection / judgment unit 82 judges whether the constant velocity joint assembly 12, which is the object to be inspected, is good or bad.

Therefore, in step S16 of the flowchart shown in FIG. 6, the inspection / determination unit 82 causes the fundamental wave component to the nth harmonic component of the phase difference signal S based on the phase difference data calculated by the encoder output analysis unit 80. Range of the phase difference set in the ROM 90, based on the total value of the phase difference in, the phase difference of the specific m-th order (sixth) harmonic component, and the phase difference of the non-specific m-th order (sixth) harmonic component The constant velocity joint assembly 12, which is the object to be inspected, depending on whether it is inside
The quality of is judged.

The result of the pass / fail judgment by the inspection / judgment unit 82, the phase difference between the fundamental wave component and the nth harmonic component of the phase difference signal S based on the phase difference by the encoder output analysis unit 80, and a specific mth (6th) harmonic. The calculation processing result such as the sum of the phase difference of the wave component and the phase difference of the harmonic component other than the specific m-th (6th) component, the measurement result of the encoder output signal by the measuring unit 76, and the like are transmitted to the CRT 44 as necessary. Display or I
It is possible to output in a desired form to the printer 42, the plotter 46, etc. via the / F92.

[0050]

As described above, according to the inspecting apparatus and the inspecting method for a constant velocity joint according to the present invention, a load equivalent to that during traveling of an automobile is applied to the output shaft (outer race side) of the constant velocity joint assembly. The encoder is attached to each of the input shaft (inner race side) and the output shaft (outer race side), and the signals output from both encoders
Obtaining a phase difference signal indicating the rotational phase difference between the input shaft and the output shaft,
The waveform of the phase difference signal is decomposed into phase difference signals of a fundamental wave component to an n-th order harmonic component, and a phase difference of a specific order harmonic component having an order equal to the number of track grooves is calculated. The total phase difference is calculated from the phase difference signal of the harmonic component of each order of, and the quality of the constant velocity joint assembly is determined by whether both phase differences are within the preset phase difference range. It is a judgment.

Therefore, it is possible to measure the degree of clearance between the steel ball and the track groove in the constant velocity joint assembly, and it is possible to perform an accurate inspection (quality judgment) in a short time. Further, even when the work (constant velocity joint assembly) once inspected and measured is re-measured, the reproducibility is excellent, and the quality can be inspected with high accuracy.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an inspection device for a constant velocity joint according to the present invention.

FIG. 2 is a diagram showing a structure of a measuring unit in the constant velocity joint inspection device.

FIG. 3 is a block diagram showing a configuration of a phase difference calculation unit.

FIG. 4 is a diagram showing waveforms of a fundamental wave and a harmonic wave of a phase difference signal based on phase difference data.

FIG. 5 is a schematic flowchart showing an inspection procedure by the constant velocity joint inspection device.

FIG. 6 is a processing flowchart of a phase difference calculation unit by the constant velocity joint inspection device.

7A and 7B are graphs for explaining a phase difference calculated by a phase difference calculation unit.

FIG. 8 is based on the phase difference calculated by the phase difference calculation unit,
It is a figure for demonstrating the quality determination area | region which determines quality of a constant velocity joint.

9A and 9B are views showing the structure of a constant velocity joint.

[Explanation of symbols]

10 ... Constant velocity joint inspection apparatus 12 ... Constant velocity joint assembly 14 ... Input shaft 16 ... Rod mounting jig 18a, 18b ... Pulley 20 ... Inverter motor 22 ... Rotary encoder 24 ... Output shaft 26 ... Outer mounting jig 28a, 28b …
Pulley 30 ... Inverter motor 32 ... Rotary encoder 34 ... Control unit 36a, 36b ...
Multiplier circuit 38 ... Phase difference detection circuit 40 ... Phase difference calculation unit 52 ... Inner race 54 ... Outer race 55 ... Track groove 56 ... Steel ball 80 ... Encoder output analysis unit 82 ... Inspection / determination unit

Claims (4)

[Claims] 1. A constant velocity joint inspection device in which an inner race serving as an input shaft is fitted through a ball into a track groove provided in an outer race serving as an output shaft. An encoder that detects rotation of a shaft, a drive source that rotates the input shaft, an encoder that is mounted on the output shaft and that detects rotation of the output shaft, a load supply source that applies a load to the output shaft, Steering means for giving an arbitrary inclination angle between the input shaft and the output shaft, and a phase difference signal indicating the rotational phase difference between the input shaft and the output shaft from the output signal of each encoder, and the phase difference signal From the fundamental wave component to the phase difference of the nth harmonic component, calculate the phase difference of the specific harmonic component of the order equal to the number of track grooves, and calculate the phase difference of each order other than the specific harmonic component. Harmonics Encoder output analysis unit for calculating the total phase difference of the phase difference of, the phase difference of the specific order harmonic component calculated by the encoder output analysis unit and the harmonic component of each order other than the specific order harmonic component And a phase difference calculation unit configured to determine the quality of the constant velocity joint based on whether or not the total phase difference is within a preset phase difference range. Inspection device for constant velocity joints. 2. The constant velocity joint inspection device according to claim 1, wherein dampers for absorbing rotational vibration are mounted at predetermined positions of the input shaft and the output shaft. 3. A method for inspecting a constant velocity joint in which an inner race serving as an input shaft is fitted via a ball into a track groove provided in an outer race serving as an output shaft, wherein the input shaft serves as a rotary drive source. Engaging, engaging the output shaft with a load supply source, applying an arbitrary turning angle to the input shaft and the output shaft, and applying an arbitrary rotation to the input shaft by the rotary drive source. A step of applying an arbitrary load to the output shaft by the load supply source and obtaining rotation signals of the input shaft and the output shaft by the first and second encoders respectively mounted on the input shaft and the output shaft; A step of calculating a rotation phase difference between the input shaft and the output shaft from a rotation signal obtained from the first and second encoders, and a rotation phase difference calculated by the calculation section is set in advance. Inspection method of the constant velocity joint, wherein determining the quality of the constant velocity joint according to whether in the range of the constant phase difference, in that it consists of. 4. The method for inspecting a constant velocity joint according to claim 3, wherein the step of calculating the rotational phase difference includes the phase difference between the input shaft and the output shaft based on the rotational signals obtained from the first and second encoders. And a step of decomposing the phase difference into a phase difference of the fundamental wave component to the nth harmonic component, a step of calculating a phase difference of a specific harmonic component of an order equal to the number of track grooves, Comprising a step of calculating the total phase difference of the phase difference of each harmonic component of each order other than the specific harmonic component, the step of determining the quality of the constant velocity joint, the calculated specific harmonic The quality of the constant velocity joint is determined by whether or not the phase difference of the components and the total phase difference of the harmonic components of each order other than the specific harmonic component are within a preset phase difference range. To do An inspection method for constant velocity joints characterized by and.