JPH032541A - Method for deciding quality of driving shaft - Google Patents

Abstract

PURPOSE:To securely decide whether or not the quality of the driving shaft is normal by measuring a rotary torque value right after the driving shaft beings to be driven to rotate, and comparing it with a specific reference value. CONSTITUTION:The driving shaft A which has an axial slide joint B at one end is held rotatably. The rotary torque value right after the rotary driving of this driving shaft A is measured and compared with the specific reference value to detect whether or not the joint B has play in the circumferential direction. Further, the quantity of variation in the rotary torque value in the maximum inclination state of the joint B is measured and compared with the reference value to detect misassembly such as a deficiency in the number of rollers of the joint B and the wrong assembly direction of the rollers. Both the detecting operations are performed to detect whether or not the assembly state of the joint B is normal and it is decided that only a driving shaft A in the normal assembly state is good.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for determining the quality of a drive shaft of an automobile or the like.

(Prior Art) Drive shafts in automobiles, etc. are used as means for transmitting rotational driving force from, for example, differential gears to wheels, but because they need to transmit power while tilting in response to the vertical movement of the wheels, etc. Usually, one end thereof is equipped with a constant velocity joint, and the other end is equipped with a constant velocity joint that is slidable in the axial direction (hereinafter referred to as an axial sliding joint).

The method of determining the operability of this type of drive shaft, especially the operability of an axial sliding joint, is to hold the drive shaft in a rotatable position, and rotate it from the axial sliding joint. A method of determining by applying a driving force to rotate the joint, then measuring the change in the rotational torque value while tilting the axial sliding joint, and comparing the measured rotational torque value with a predetermined reference value. has been proposed by the applicant.

This determination method can automate the operation inspection of the drive shaft, which conventionally relied on the manual work of a μ) expert, and can improve the work efficiency.

By the way, the axial sliding joint is, for example, as shown in the first diagram, an inner member a fitted to the drive shirt l-A main body.
However, a boat e protruding from the outer circumferential surface of the inner part +4'a is attached to a roller d which is removably engaged with each of a plurality of grooves C formed in the axial direction on the inner circumferential surface of the outer member. This allows the inner member a to freely slide in the axial direction relative to the outer member, so that when assembling this to the drive shaft A, the rollers d, etc. Misassembly may occur, such as missing parts or incorrectly assembling the roller d, and the assembled state may not be a normal assembled state.

In such a case, for example, Drive Shirt I-A
If all of the rollers d of the axial sliding joint B are missing, looseness will occur between the inner member a and the outer member, and as a result, the operability of the drive shaft will be reduced.

However, in the above determination method, in order to measure the rotational torque value by tilting the drive shaft A with the drive shaft A rotated, and therefore with the axial sliding joint B rotated, it is necessary to Even if there is the above-mentioned backlash when the sliding joint B is stopped, this backlash does not occur during rotation during the measurement, and therefore the measured rotational torque value has almost no difference from that of a good product. There was a risk that the drive shaft with such a missing part would be judged as a good product.

(Problem to be Solved) The present invention solves this inconvenience by tilting the axial sliding joint while rotating the 1ζ live shaft and measuring the rotational torque value, and determining whether the drive shaft is good or not based on the measurement results. In this method, it is possible to reliably detect abnormal assembly conditions such as circumferential play in the axial sliding joint, missing parts, incorrect assembly, etc., and reliably determine whether the drive shaft is good or bad. The purpose is to provide a method that can be used.

(Means for Solving the Problems) The inventors of the present invention have discovered that when there is play in the circumferential direction of an axial sliding joint incorporated in a drive shaft, for example, when all of its rollers are missing, Immediately after the rotational drive starts, almost no reaction torque is generated due to the rotational drive, and after the axial sliding joint has rotated, the change in rotational torque value when tilting the joint is similar to that of a normal assembled state. It is almost the same as that of an axial sliding joint (hereinafter simply referred to as a good product), and it is also possible that some of the rollers of the axial sliding joint are missing, or that the rollers are assembled in the wrong direction. In the case of incorrect assembly, the reaction torque mentioned above is almost the same as that of a good product, but we focused on the fact that the fluctuation in rotational torque value becomes larger in the maximum tilt state compared to that of a good product. When determining pass/fail by measuring 1-rook of rotation, the rotational torque of the axial sliding joint is measured immediately after rotational driving, and the amount of change in rotational torque in the maximum inclination state of the axial sliding joint is measured. This makes it possible to reliably detect looseness in the circumferential direction of the axial sliding joint, missing parts such as rollers, and incorrect assembly, and judge only drive shafts that are properly assembled to be good. I gained knowledge.

Therefore, in order to achieve the above object, the method for determining the quality of a drive shaft of the present invention is such that, while a drive shaft having an axial sliding joint at one end is rotatably held, In the method of tilting the axial sliding joint while applying rotational driving force from the sliding joint and measuring the rotational torque value, and determining the quality of the drive shaft based on the measurement result, a step of measuring the magnitude of the rotational torque value immediately after the start; a step of comparing the magnitude of the rotational torque value immediately after the start with a predetermined reference value to determine its acceptability; and a step of measuring the magnitude of the rotational torque value immediately after the start. The method is characterized by comprising a step of measuring the amount of change in the rotational torque value depending on the tilted state, and a step of comparing the amount of change with a predetermined reference value to determine whether it is good or bad.

(Function) According to this means, the rotational torque value of the drive shaft is measured immediately after rotational driving, and the rotational torque value is compared with the reference value, thereby eliminating play in the circumferential direction of the axial sliding joint. The presence or absence of the roller of the axial sliding joint is detected, and further, by measuring the amount of change in the rotational torque value in the maximum inclination state of the axial sliding joint and comparing the amount of change with the reference value, The presence or absence of incorrect assembly, such as missing several parts or incorrect assembly direction of the rollers, is detected, and the rain detection determines whether the assembly condition of the axial sliding joint is normal. is detected, and only the normally assembled drive shirts) are judged to be good.

(Example) An example of the method for determining the quality of the drive shaft of the present invention will be described in the first example.
This will be explained according to FIGS. 4 to 4. Figure 2 is an explanatory step to explain the general configuration of the device for determining quality of the drive shaft A described above, Figure 3 is a flowchart 1 for explaining the procedure for determining quality by this device, and Figure 4 is a flowchart for measurement. It is a schematic diagram of an example of data.

In FIG. 2, this quality determination device holds an axial sliding joint B and a constant velocity joint C at both ends of a drive shaft A rotatably by respective holders 1.2, and the constant velocity joint C is Drive shirt by connecting the load means 3 via the holder 2)
A load is applied to A when it rotates. A drive shaft 4 is concentrically connected to the axial sliding joint B via a holder 1, and the drive shaft 4 is further connected to a drive motor 7 via a torque make 5 and a drive heald 6. Rotational driving force is applied to the axial sliding joint B by the operation of the drive motor 7, and thereby the drive shaft A
is rotated.

Further, these drive motor 7, torque meter 5, and holder 1 are tilted as shown by the imaginary line by a cylinder (not shown), so that the axial sliding joint B held by the holder 1 moves to its maximum inclination angle. It will be moved until around 1.

The torque maker 5 detects the torque generated on the drive shaft 4 during the rotation described above, that is, the rotational torque of the driveshaft A, and outputs a signal corresponding to the rotational torque value. The signal is input to a quality determiner 8 that performs signal processing to determine quality.

The pass/fail determiner 8 amplifies the output signal of the torque meter 5 with a strain amplifier 9 and then converts the output signal with an A/D converter 10 into an A/D converter 10.
D conversion is performed, and this is processed by the CPU II as described later to determine whether the drive shaft A is good or bad, and the determination result is displayed on the display unit 12.

The overall operation of this quality determination device is controlled by a main controller 13, and the output signal of the torque meter 5 is successively recorded by a pen recorder 14 connected to the output side of the strain amplifier 9.

Next, the overall procedure for determining the quality of the drive shaft A by the quality determining device will be described in accordance with FIG. 3 with reference to FIG. 2.

In this quality determination device, after the axial sliding joint B and the constant velocity joint C of the drive shaft A are held concentrically by the image holders 1 and 2, as shown by the solid line in FIG.
Under the control of the main controller 13, first, as described above, rotational driving force is applied to the axial sliding joint B to rotate the drive shaft A, and almost at the same time, the drive shaft A is rotated.
Measurement of the rotational torque is started by PUII.

Immediately after this rotation, the CPU II detects the magnitude of the reaction torque that occurs in the direction opposite to the rotational direction when the rotational driving force is applied to the axial sliding joint B, and the CPU II detects the magnitude of the reaction torque, which will be described in detail later. The value is compared with a predetermined reference value to determine pass/fail. At this time, if it is determined to be defective, the following procedure is canceled, and if it is determined to be good, the axial sliding joint B is rotated as described above under the control of the main controller 13. tilted.

This tilting is performed until the axial sliding joint B reaches the maximum inclination state, and once the maximum inclination state is reached, this state is maintained for a predetermined period of time. In this holding state, the CPU II detects the amount of variation in the rotational torque to the drive shaft, and compares the detected value with a predetermined reference value to determine whether the drive shaft is good or not, although the details will be described later. At this time, as described above, if it is determined to be defective, the following procedure will be canceled; if it is determined to be good, the main controller 13 will be stopped.
Under this control, the axial sliding joint B is tilted in the opposite direction to the above and returned to its original position, thereby completing the inspection for determining the quality of the drive shaft A.

Next, we will apply the above judgment method to Fig. 4 with reference to Fig. 1 and Fig. 2.
This will be explained in detail according to the diagram.

FIG. 4 schematically shows the change in rotational torque T with respect to time t when the above measurements were performed on a good drive shaft A.

In FIG. 4, in a drive shaft A of good quality, the driving force of the drive motor 7 acts on the drive shaft 4 and rotates the drive shaft A connected thereto immediately after the start of rotation. The rotational torque T suddenly increases in the direction of rotation, and at the next moment, as a reaction, a relatively large torque Tr (hereinafter referred to as reaction torque Tr) is applied to the drive shaft 4 from the drive shaft A side to prevent the rotation. ) occurs, and thereafter the rotational torque T oscillates and attenuates to a constant torque value. In the above first determination, this reaction torque Tr is detected at a predetermined time interval L1 immediately after the rotation of the drive shaft A starts, and its magnitude is 1゛s, which is the preset reference value of the rotational torque T. , and if the magnitude of the reaction torque Tr is equal to or greater than the reference value Ts, it is determined to be good.

Here, in FIG. 1, for example, in the case where all the rollers d are missing as described above, the inner member a fitted to the drive shirt l-A main body of the axial sliding joint B and the rotating If there is play in the circumferential direction between the outer member and the outer member to which the driving force is applied, the inner member a and the outer member are not in close contact with each other in the circumferential direction. As shown by the imaginary line in Figure 4, the reaction torque Tr is not as large as that of a good product.
If it becomes smaller than s, it is determined to be defective.

After this determination, when the axial sliding joint B starts tilting, the rotational torque T increases while periodically vibrating with a relatively small amplitude in a good drive shaft A, as shown in Figure 4. world.

In the second determination, after the axial sliding joint B reaches the maximum inclination state, after a predetermined time interval t2 has elapsed, the amplitude width ΔTf (hereinafter referred to as (Simply referred to as friction torque ΔTf)
is detected, and if the value of the friction torque ΔTf is less than or equal to a preset reference value ΔTs, it is determined to be good.

Here, if the axial sliding joint B is not assembled normally, for example, if several of the rollers d shown in the first figure are missing, or if the rollers d are assembled in the wrong direction. If there is an incorrect assembly such as
If the friction torque exceeds the reference value ΔTs, it is determined to be defective.

As mentioned above, in this embodiment, the reaction torque T
By detecting r, the play in the circumferential direction of the axial sliding joint B is detected, and furthermore, by detecting the friction torque ΔTf in the maximum inclination state of the axial sliding joint B, it is possible to prevent incorrect assembly. Through these detections, an abnormal assembly state of the axial sliding joint B is detected, and based on this, the quality of the drive shirt A is determined.

(Effects) As is clear from the above description, according to the drive shaft quality determination method of the present invention, the magnitude of the rotational torque value immediately after the start of rotational driving of the drive shaft is measured and this value is set to a predetermined reference value. By comparing this with By comparing this with a predetermined reference value, it is possible to reliably detect the presence or absence of missing or incorrectly assembled components of the axial sliding joint. It is possible to reliably detect whether the moving joint is in a normal assembled state, and therefore it is possible to reliably determine whether the drive shaft is good or bad.

[Brief explanation of drawings]

Figure 1 is an explanatory sectional view of an example of an axial sliding joint, Figure 2 is an explanatory diagram illustrating the general configuration of a drive shaft quality determination device, and Figure 3 is an overall view of quality determination by this device. FIG. 4 is a flowchart for explaining the procedure, and FIG. 4 is a schematic diagram of an example of measurement data.

Claims (1)

[Claims] 1. With a drive shaft equipped with an axial sliding joint at one end rotatably held, the axial sliding joint is tilted while applying rotational driving force to the drive shaft from the axial sliding joint. and measure the rotational torque value,
The method for determining the quality of the drive shaft based on the measurement results includes the steps of: measuring the magnitude of the rotational torque value immediately after the start of rotational driving of the driveshaft; a step of comparing the amount of change with a predetermined reference value to determine whether it is good or bad; a step of measuring the amount of variation in the rotational torque value at least in the maximum tilt state of the axial sliding joint; and a step of comparing the amount of change with a predetermined reference value to determine whether it is good or bad. A method for determining the quality of a drive shaft, comprising the step of determining the quality of a drive shaft.