JPH0541935B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Application Field) The present invention applies rotational driving force to the outer member of a constant velocity joint while tilting its inner member, and detects changes in rotational torque at this time. The present invention relates to an inspection method and apparatus for determining the quality of constant velocity joints.

(Prior Art) Conventionally, constant velocity joints that have an inner member and an outer member coaxially are used, for example, in a constant velocity joint of a drive shaft that is used in an automobile and transmits rotation from the drive side at a constant velocity when a wheel or the like swings. The quality of the ball joint is judged by the operator's feeling when the operator tilts the inner member relative to the outer member. According to this method, since the acceptability is judged by the operator's senses, it is possible to detect a feel lock in the outer member during the tilting, which causes the ball of the inner member to roll unsmoothly.
However, since it is done manually by the operator, the work efficiency is low, and there are many erroneous judgments, making it difficult to accurately judge whether it is good or bad.

Therefore, as a device that automatically performs this process, one described in Japanese Utility Model Application Laid-open No. 62-201631 is known.
This system holds the inner member rotatably by tilting it to the maximum practicable predetermined angle relative to the outer member, rotates the outer member that engages with the inner member via a ball, and detects changes in rotational torque. The upper limit value, lower limit value, and torque fluctuation width of the rotational torque obtained are compared with preset reference values to determine the quality of the constant velocity joint. However, if the outer member is rotated while the inner member is held tilted at a maximum predetermined angle, the rotational torque value increases, and small torque changes such as feel lock cannot be detected, leading to incorrect judgments as to whether the constant velocity joint is good or bad. There is an inconvenience that there is.

(Problems to be Solved by the Present Invention) It is an object of the present invention to provide a method and apparatus for detecting a constant velocity joint that can eliminate such conventional inconveniences and reliably inspect the function of the constant velocity joint. .

(Means for Solving the Problems) In order to achieve the above object, the inspection method of the present invention holds an inner member and an outer member of a constant velocity joint in an assembled state so as to be rotatable coaxially, and the inner member Apply a rotational driving force to the outer member, tilt the inner member to a predetermined angle around the tilting center of the constant velocity joint, detect the rotational torque at the time of tilting, and calculate the detected torque value at each tilting angle. It is characterized in that the quality of the constant velocity joint is determined by comparing it with the set torque value in .

Further, the inspection device of the present invention is provided with an outer holding means that rotatably holds the outer member, and an inner drive that is movable forward and backward facing the outer holding means, engages with the inner member, and rotationally drives the inner member. a tilting means for tilting the inner drive means around a tilting center of the inner member and the outer member; a drive torque detection means for detecting the drive torque by the inner drive means; The present invention is characterized in that a determining means is provided for comparing the detected torque value with the set torque value at each tilt angle to determine whether it is good or bad.

(Function) According to this step, the inspection method of the present invention holds the outer member of the constant velocity joint and applies a rotational driving force to the inner member disposed coaxially with the outer member. From this state, the inner member is gradually tilted around the tilting center of the constant velocity joint, the rotational torque at this time is detected, the detected torque value is compared with the set torque value at each tilt angle, and the constant velocity joint is tilted. Judgment of pass/fail is made.

According to this configuration, the inspection device of the present invention holds the outer member of the constant velocity joint in the outer holding means, and causes the inner driving means to approach and engage with the inner member within the outer member.
In this state, the inner driving means is driven to rotate the constant velocity joint, and the tilting means tilts the inner driving means around the tilting center of the constant velocity joint. The rotational torque at this time is detected by the drive torque detection means, and the detected torque is compared with the set torque value at each tilt angle by the determination means to determine whether the constant velocity joint is good or bad.

(Example) An apparatus for implementing the present invention will be described in detail below with reference to FIGS. 1 to 4.

FIG. 1 is a side view, FIG. 2 is a rear view, FIG. 3 is an explanatory sectional front view, and FIG. 4 is a configuration diagram of the apparatus.

This implementation device includes an outer holding means 2 that rotatably holds a constant velocity joint
a drive device 4 which is an inner drive means equipped with;
A parallel link device 7 is provided with support shafts 5 and 6 on the machine base 1 and is a tilting means for holding and tilting the drive device 4.
, a torque meter 8 which is a drive torque detection means connected to the drive device 4 and detects the generated torque, and a fourth
As shown in the figure, the control device 9 includes means for controlling the main body of the device and determining means for determining whether the constant velocity joint X is good or bad.

As shown in the third diagram, the outer holding means 2 is provided with a bearing portion 2a that rotatably holds the tilting center O of the constant velocity joint X at the same height as the center of the support shafts 5 and 6 of the parallel link device 7, A dispensing cylinder 10 is provided for dispensing the constant velocity joint X held on the bearing portion 2a at the end of the inspection.

As shown in the first diagram, the drive device 4 includes a driven section 4a provided with a drive shaft 3 above the outer holding means 2, and a drive section 4b connecting a reducer 13 and an electric motor 14, and a belt provided above. 12 transmits the rotational driving force of the drive section 4b to the driven section 4a. 15
indicates a torque limiter connected to the drive section 4b.

As shown in the first figure, a tilting girder 11 that supports the driven portion 4a at the left front and supports the drive portion 4b is provided at a position straddling the rear parallel link device 7, and the drive device 4 is connected to the parallel link via the tilting girder 11. It is held in the device 7 so as to be tiltable at positions C and D shown in the third figure.

The drive shaft 3 of the driven portion 4a has a spline at its tip, and is connected to spline engagement means (not shown) that is disengaged upward in response to overload. The meshing means is slidably connected to a torque meter 8 driven by a belt 12. At the upper end of the torque meter 8 is an encoder 1 for data sampling.
6 will be provided. A lower mounting plate 17 is provided that protrudes forward to the left from the tilting girder 11, and an elevator frame 19 is provided below the lower mounting plate 17 for holding the drive shaft 3 through the spline engagement means. The elevator frame 19 is provided so as to be freely raised and lowered by a guide 18.
An elevating cylinder 20 is provided on the lower mounting plate 17 so that the drive shaft 3 can be attached to and detached from the constant velocity joint X via the lower mounting plate 17. The torque meter 8 is held at its upper and lower sides by upper and intermediate mounting plates 21 and 22 that protrude forward from the tilting girder 11.

As shown in the third diagram, the parallel link device 7 includes upper and lower parallel links 23 and 24, and a swinging link 2 of the same length that allows the parallel links 23 and 24 to move left and right.
5, 26, and a connecting pin 2 that swingably supports the upper parallel link 23 and the left and right swing links 25, 26.
3a, 23b, and support shafts 5, 6 that swingably support the swing links 25, 26 at the same height as the tilting center O of the constant velocity joint By fixing plates 27 and 28, A, B,
A link mechanism that connects C, D, H, H, and G is formed and provided. Furthermore, a tilting cylinder 30 that is connected to the support shaft 29 of the connecting portion E between the lower parallel link 24 and the right swinging link 25 and swings the swinging links 25 and 26 is swingably attached to the left side fixed plate 28. establish. The parallel links 23 and 24 swingably hold the tilting girder 11 at positions C and D, and the swinging of the tilting cylinder 30 pulls and tilts the drive device 4.

Next, the operation of the implementation device will be explained with reference to FIG.

First, the drive device 4 is brought into an upright state, and the constant velocity joint X, which is a test object, is rotatably held in the bearing 2a of the outer holding means 2. Next, the elevator frame 19 is lowered by driving the elevator cylinder 20 of the drive device 4,
The drive shaft 3 is engaged with the spline of the inner member of the constant velocity joint X. By driving the electric motor 14 in this state, the torque meter 8, the spline engagement means, and the drive shaft 3, which constitute the driven portion 4a, are rotated via the belt 12. Thereafter, the tilt cylinder 30 of the parallel link device 7 is compressed to swing the swing links 25 and 26 around the support shafts 5 and 6.
The swinging links 25 and 26 are centered at the tilting center O of the constant velocity joint X.
Since the support shafts 5 and 6 whose axial center positions coincide with those of A, b, ha, d, ho,
From the position of F, G, A', B', C', D', Ho', F,
is moved to the virtual line position of the point. The parallel link 2
3 and 24, the tilting girder 11, which is swingably connected to the parallel links 23 and 24 at positions C and D, is tilted from the positions C, D, and O to the positions C', D', and O. A drive device 4 attached thereto is tilted.

As described above, the drive shaft 3 is tilted while being driven, and the inspection is performed while the drive shaft 3 is being tilted. The fourth test
This will be explained using figures.

Inspection is to check the number of balls of constant velocity joint X and drive shaft 3
A control device 9 detects changes in rotational torque during tilting by each sensor and torque meter 8, which will be described later, and is connected to each sensor and torque meter 8.
The quality of the constant velocity joint X is determined by the following. The control device 9 includes a sensor controller 33 connected to a ball detection proximity sensor 31, and a torque meter 8.
a data setting terminal 35 for setting and inputting data, a display 36 and a printer 37 as output means, and a tilting angle detection sensor 3 for detecting the tilting angle of the drive shaft 3.
8 and a CPU 39 that determines quality based on inputs or outputs from these, and a main body control device 40 is connected to the CPU 39.

The number of balls is inspected by continuously detecting the number of balls with the ball detection sensor 31 at the time of maximum tilt.
The number of balls in the constant velocity joint X in one rotation of the drive shaft 3 is counted. If the ball detection sensor 31 counts a predetermined number in one revolution of the drive shaft 3, it is determined that it is acceptable, and if the predetermined number is insufficient, the constant velocity joint
is judged as non-conformity and output.

Detection of changes in rotational torque is performed using the following method.
FIG. 5 shows a torque-tilting angle diagram, with the vertical axis representing increasing torque value and the horizontal axis representing decreasing tilting angle toward the right. When tilting the constant velocity joint X, the generated torque T has a maximum value T _MAX and a minimum value T _MIN ,
When the tilt angle on the right side of the figure is small, the torque value is stable at a low value, and as the tilt angle on the left side increases, the generated torque T increases and the difference between the maximum value T _MAX and minimum value T _MIN also increases, causing the amplitude to increase. tends to become larger.

Corresponding to the generated torque T, the range of each allowable value at the predetermined tilting angles θ0 to θ6, that is, the maximum torque allowable range Ta _MAX/MAX ~
Ta _MAX/MIN , minimum torque allowable range Ta _MIN/MAX ~
Ta _MIN/MIN , center torque tolerance Ta _MEAN/MAX ~
Ta _MEAN/MIN , allowable torque width, and torque increase rate at maximum value T _MAX and minimum value T _MIN are set in advance.

Maximum torque allowable range Ta _MAX/MAX ~ Ta _MAX/MIN and minimum torque allowable range Ta _MIN/MAX ~ Ta _MIN/MIN determine the fit of the balls of constant velocity joint X, etc., and the center torque allowable range Ta _{MEAN /MAX} ~ Ta _MEAN/MIN indicates the tendency of torque change when constant velocity joint judge.

Next, when tilting the drive shaft 3, the torque meter 8 and the tilting angle detection sensor 38 detect the maximum value T _MAX and minimum value T _MIN of the generated torque T at each tilting angle, and each tilting angle θ0 to The central torque value, torque fluctuation range, and torque increase rate at θ6 are calculated and processed by the CPU 39, and compared with each preset allowable value to judge whether the torque is good or bad.

In this way, the maximum torque value, minimum torque value, center torque value, torque fluctuation width at a plurality of predetermined tilt angles of the drive shaft 3, and the rate of increase on the maximum torque value side and the minimum torque value side between each predetermined tilt angle are calculated. By setting each allowable value of the torque increase rate and comparing the calculated values of the generated torque values detected by the torque meter 8 and the tilt angle detection sensor 38, the state and function of the constant velocity joint X can be accurately determined. Can be inspected.

In particular, since the torque increase rates at the maximum and minimum torque values are also compared, it is possible to detect minute torque changes such as wheel locking that occurs during tilting, thereby further increasing the accuracy of the inspection.

In addition, this device automatically determines the quality of the constant velocity joint X, and since the outer holding means 2 for holding the constant velocity joint It can be easily placed in the process, and installation and inspection can be performed consistently, improving work efficiency.

(Effects) As is clear from the above description, the present invention tilts the inner member while applying a rotational driving force, detects the rotational torque during the tilting, and compares it with each set value to judge whether it is good or bad. By doing so, it is possible to provide a constant velocity joint detection method that can reliably inspect the function of the constant velocity joint.

Further, in the present invention, the outer holding means holds the constant velocity joint, the inner driving means applies rotational driving force to the constant velocity joint, the tilting means tilts the joint, the driving torque detecting means detects the rotational torque, and the determination means detects the rotational torque. It is possible to provide a constant velocity joint detection device that can reliably inspect the function of a constant velocity joint by outputting and comparing the results and determining whether the joint is good or bad.

[Brief explanation of drawings]

1 to 5 show an apparatus for implementing the present invention, in which FIG. 1 is a side view, FIG. 2 is a rear view, FIG. 3 is an explanatory sectional front view, and FIG. 4 is a configuration diagram of the device. Figure 5 shows a torque-tilting angle diagram. 2...Outer holding means, 4...Inner drive means, 7...Tilt means, 8...Drive torque detection means, 9...Determination control means, X...Constant velocity joint.

Claims (1)

[Scope of Claims] 1. An inner member and an outer member of a constant velocity joint are held rotatably on the same axis in an assembled state, and a rotational driving force is applied to the inner member, and the inner member is moved relative to the outer member. The constant velocity joint is tilted around the tilting center up to a predetermined angle, the rotational torque during the tilting is detected, and the detected torque value is compared with the set torque value at each tilting angle to determine whether the constant velocity joint is good or bad. A constant velocity joint inspection method characterized by: 2. An outer holding means for rotatably holding the outer member is provided, and an inner driving means is provided opposite to the outer holding means so as to freely move forward and backward to engage with the inner member and rotationally drive the inner member,
A tilting means is provided for tilting the inner drive means around a tilting center of the inner member and the outer member, a drive torque detection means is provided for detecting the drive torque by the inner drive means, and the drive torque detection means detects the drive torque of the inner drive means. 1. An inspection device for a constant velocity joint, comprising a determining means for comparing a detected torque value with a set torque value at each tilting angle to determine whether the joint is good or bad.