JPH10263941A - Detecting device for defective fitting of snap ring - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely detect the quality of the fitted state of a snap ring by providing a detecting punch having the outer diameter couplable with the inner diameter of the snap ring when the snap ring is correctly fitted to the fitting groove of a work protrudably with an actuator. SOLUTION: A position detecting switch detecting the stroke advance end position of a press-in punch 6 is operated, the operating pressure is fed to a fluid passage 11a for an actuator, and a detecting punch 8a is operated to the advance side by a piston 8 and is coupled with the inner diameter of a snap ring 3. A detecting means 9 provided in the press-in punch 6 is operated interlockingly with this action, a through hole 6c and the detection hole 8c of a detecting piece 8b are set to the communicating state, and the input signal from a light input section is received by a light reception section and inputted to a display device 10. The display device 10 displays that the snap ring 3 is correctly fitted based on this action signal and input signal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a snap ring mounting defect detecting device capable of simultaneously detecting press fitting of a C-type snap ring and detecting whether the press-fit state is good or not.

[0002]

2. Description of the Related Art In general, an axle housing for supporting an axle shaft of a vehicle has a shape as shown in FIG. 1, a bearing is press-fitted into an inner diameter of the housing, and a snap ring is mounted in a groove provided at one end thereof. Thus, the bearing is held and fixed to the housing. Oil seals (not shown) are press-fitted into both end portions of the bearing to protect the bearing. Here, it is general that the snap ring is assembled by press-fitting with a press-fitting punch of a press. Can not be fixed securely,
During use, there is a risk of generating abnormal noise, increasing wear, and the like.

[0003] For the press-fitting of the snap ring, for example, Japanese Unexamined Utility Model Publication No. Hei 4-45634 and Japanese Unexamined Patent Publication No.
A confirmation detection device such as that disclosed in Japanese Patent No. 50731 has been proposed. Here, when the snap ring is press-fitted, the fit of the snap ring is checked by measuring the width of the cut opening of the snap ring. In the latter case, a plurality of detecting air outlets for opening are provided on the pressing end face of the press-fitting punch of the snap ring, and whether the snap ring is mounted in the mounting groove is determined by a change in the air flow of the outlet. The detection is performed by a method in which an air outlet is brought into contact with the end face of the snap ring.

[0004]

However, in the former of the prior art described above, the press-fitting of the snap ring is checked directly by measuring the opening width of the snap ring. The press-fitting jig must be set in the same direction, which complicates the press-fitting operation. In the latter prior art, an air outlet is provided in the pressing surface of the press-fitting punch of the snap ring, and a change in the air flow due to the closing and opening of the outlet is detected. Therefore, if the air outlet hangs over the opening of the snap ring, the detection may be inaccurate, and it is necessary to align the opening directions when setting the snap ring to the press-fitting jig as in the former case.

The present invention has been made in view of such circumstances, and when a snap ring is press-fitted into a housing (work), supply of the snap ring to the press-fitting jig is facilitated and the snap ring is provided. It is an object of the present invention to provide a snap ring improper mounting detection device capable of reliably detecting whether the snap ring is in good or bad state at the same time as press fitting.

[0006]

In order to achieve this object, a snap ring mounting failure detecting device according to the present invention is provided with a tapered hole at a hole end of a work having a snap ring mounting groove on an inner peripheral surface of a cylindrical hole. In a snap ring mounting apparatus in which a press-fitting jig having an abutment is pressed and a snap ring is pressed and compressed by a press-fitting punch of a press device and a snap ring is fitted and mounted in the mounting groove, a snap ring is provided on a pressing side of the press-fitting punch. A detecting punch having an outer diameter that can be fitted to the inner diameter of the snap ring when accurately mounted in the mounting groove, is installed inside the actuator so as to be able to protrude and retract by an actuator, and detects its operation in conjunction with the detecting punch. Is established,
A display device is provided for displaying whether or not the snap ring is mounted properly based on a signal from the detecting means.

According to a second aspect of the present invention, the detecting means of the snap ring installation failure detecting device is provided with a light incident portion and a light receiving portion at both ends of a through hole provided in a radial direction of the press-fitting punch, and provided at an intermediate portion thereof. And a photoelectric sensor provided with a detector that brings the through hole into a communicating state or a closed state in conjunction with the movement of the detection punch.

According to a third aspect of the present invention, there is provided a snap ring installation defect detecting device, wherein the detection punch provided inside the press-fitting punch is configured to be operated by a pneumatic cylinder.

In the above snap ring mounting device,
The snap ring is supplied to the large-diameter portion of the press-fitting jig provided in communication with the mounting hole of the work. Then, it is pressed by the press-fitting punch of the press device and fitted and mounted in the mounting groove. At this time, the inside diameter of the snap ring is expanded to the inside diameter in the correct mounting state. Then, in accordance with this, the detection punch provided inside the press-fitting punch protrudes by the operation of the actuator and fits into the inner diameter of the snap ring,
The attachment of the snap ring is detected by the detection means. Based on this detection signal, whether the snap ring is mounted or not is displayed on the display device.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 and 2 are partial cross-sectional views of a main part of a press device showing an example of the device of the present invention. A housing 1 for mounting a snap ring is attached to a jig (not shown). The cylindrical hole 1a of the housing 1 is provided with a concave groove 1b for mounting the snap ring 3 on the inner peripheral surface. At the end 1c of the cylindrical hole 1a of the housing 1, a press-fitting jig for holding the bearing 2 and the snap ring 3 as a press-fitting attachment and guiding the press-fitting of the bearing 2 and the snap ring 3 into the housing 1. 4
It is provided in contact. Cylindrical guide 4a of press-fit jig 4
Is formed in a small-diameter portion 4c substantially equal to the inner diameter of the cylindrical hole 1a of the housing 1, and the other side is formed in a tapered hole 4b whose diameter is sequentially increased.

At a position (upper part in the drawing) facing the housing 1 and the press-fitting jig 4, a press-fitting punch 6 of a press device is provided to press the bearing 2 and the snap ring 3 supplied to the press-fitting jig 4. The housing has a pressing portion 6a for press-fitting into the housing 1. On the pressing portion 6a side, there is a play with respect to the inner diameter D when the snap ring 3 is accurately mounted in the snap ring mounting groove 1b of the housing 1. A detection punch 8a having an outer shape d that can be inserted in a fitting manner is provided so as to be able to protrude and retract by an actuator.

As shown in the enlarged sectional view of FIG. 3, the press-fitting punch 6 is provided with an actuator comprising a cylinder 7 and a piston 8 in a punch inner diameter 6b. The fluid passages 11a and 11b are provided in communication with each other, and are operated by supplying and discharging air pressure and the like, for example. In the retreat position of the press-fit punch 6, the piston 8 is operated to the retreat position (upper side in the figure) by a position detection switch (not shown), and the lower end surface of the detection punch 8a is pressed by the pressing surface of the pressing portion 6a of the press-fit punch 6. On the same plane or slightly retracted position. At the stroke advance end position of the press-fit punch 6, the position detection switch (not shown) operates the piston 8 of the actuator to the forward side (lower side in the figure), and presses the detection punch 8a by the pressing portion 6a of the press-fit punch 6. The operation signal of the position detection switch is input to a display device 10 to be described later.

In the upper part of the actuator, there is provided a through hole 6c penetrating through the press-fitting punch 6 in the radial direction.
A hole into which the piston rod of the actuator and the detector 8b provided at the end thereof are inserted and fitted, for example, a two-plane width W
6d is provided so as to intersect the through hole 6c. The detector 8b inserted and fitted into the hole 6d has:
When the piston 8 operates to the forward side, the press-fitting punch 6
Detection hole 8c communicating with the through hole 6c provided in
Is provided.

Further, the through hole 6c has, on one side, a light input section 9a such as a photoelectric tube or the like, which becomes an input signal for detection,
On the other hand, a light receiving section 9b for receiving the input signal is provided,
The detector 8b constitutes the detecting means 9. The signal detected by the light receiving unit 9b is input to the display device 10 together with the operation signal of the stroke advance end position detection switch (not shown) of the press-fitting punch 6, and the light reception unit following the operation signal from the position detection switch. The presence or absence of the detection signal from 9b indicates whether the snap ring is press-fitted or not.

Next, the operation of the present invention thus configured will be described. First, the housing 1 in which the snap ring mounting groove 1b is provided on the inner peripheral surface of the cylindrical hole 1a is attached to a jig (not shown). A bearing 2 to be press-fitted and a press-fitting jig 4 supplied with a snap ring 3 are in contact with a hole end 1c of the cylindrical hole of the housing 1, and a tapered hole 4b of the jig and a cylindrical hole 1a of the housing are formed. They are communicated concentrically. Here, when the press device is operated to lower the press-fitting punch 6, the end of the pressing portion 6 a of the punch comes into contact with the snap ring 3 in a free state, and along the tapered hole 4 b of the jig 4. The snap ring 3 is moved together with the bearing 2 while reducing the diameter, and is pressed into the cylindrical hole 1a of the housing 1, and the snap ring 3 is fitted and mounted in the mounting groove 1b. At this time, the snap ring 3 is released from the reduced diameter state due to the cylindrical hole 1a.

Here, a position detection switch for detecting the position of the stroke advance end of the press-fitting punch 6 operates to supply operating pressure to the fluid passage 11a to the actuator, and the piston 8 moves the detecting punch 8a forward. , Mounting groove 1
B is fitted to the inner diameter D of the snap ring 3 attached.
In conjunction with this operation, the detecting means 9 provided in the press-fitting punch 6 also operates, so that the through hole 6c and the detecting hole 8c of the detector 8b are in communication with each other, and the input signal from the light input section 9a is received. The data is received by the unit 9b and input to the display device 10. Therefore, the display device 10 indicates that the snap ring 3 is correctly mounted by the operation signal from the forward end position detection switch of the press-fit punch 6 and the input signal from the light receiving portion 9b.

If the snap ring 3 does not fit into the mounting groove 1b for some reason even when the press-fitting punch 6 is at the stroke advance end position in the above-mentioned snap ring 3 mounting operation, the stroke advance position detection switch is set. Actuation causes the actuator to operate and the detection punch 8a
Snap ring 3 has cylindrical hole 1
Since the diameter is reduced within a, the detection punch cannot be fitted to the inner diameter of the snap ring 3. Therefore, since the through hole 6c and the detection hole 8c do not communicate with each other in the detection means 9, the signal from the light incident portion 9a does not reach the light receiving portion 9b, and no signal is input to the display device 10. For this reason,
The display device 10 displays a snap ring mounting failure.

In the above embodiment, the actuator for operating the detection punch 8a has been described as a hydraulic cylinder, but other means, such as an electromagnetic drive, may be used. As for the detecting means 9, as the sensor, various optical sensors using a phototransistor or the like can be used other than the photoelectric tube type, and further, a pressure sensor configured as a pneumatic circuit and introducing pneumatic pressure can be used. .

[0019]

As described above, according to the snap ring mounting failure detecting device of the present invention, the quality of the mounting is detected by directly fitting the detecting punch to the inner diameter of the snap ring press-fitted and mounted. With this configuration, it is possible to detect regardless of the opening direction of the cut opening of the snap ring, so there is no need to align the opening direction when supplying the snap ring to the jig, and the workability of snap ring mounting work can be greatly improved. . Further, since the mounting state of the snap ring is directly fitted to the inner diameter of the snap ring for detection, the detection accuracy can be made extremely high, and reliable detection is possible. In addition, since the detection mechanism operated by the cylinder has a simple configuration and uses an optical sensor as the detection means, the device can be used stably. Furthermore, if the actuator is constituted by an air cylinder, the response of the detection operation can be improved and the device can be simplified.

[Brief description of the drawings]

FIG. 1 is an overall view of a defect detection device according to an embodiment of the present invention.

FIG. 2 is a diagram showing an operation state of FIG. 1;

FIG. 3 is an enlarged view of a main part of FIG. 2;

FIG. 4 is a front view of a snap ring.

[Explanation of symbols]

 Reference Signs List 1 housing (work) 1b snap ring mounting groove 2 bearing 3 snap ring 4 press-in jig 6 press-in punch 7 cylinder 8 piston 8a detection punch 9 detection means 10 display device

Claims (3)

[Claims] 1. A press-fitting jig having a tapered hole is brought into contact with a hole end of a work having a snap ring mounting groove on an inner peripheral surface of a cylindrical hole, and a snap ring supplied to the press-fitting jig is press-fitted by a press device. In a snap ring mounting device in which a snap ring is pressed and compressed by a punch and a snap ring is fitted and mounted in the mounting groove, on the pressing side of the press-fitting punch, the snap ring has an inner diameter when the snap ring is correctly mounted in the mounting groove of the work. A detection punch having a fittable outer diameter is provided inside the actuator so as to be able to protrude and retract by an actuator, and detection means for detecting the operation in conjunction with the detection punch is provided, and a snap ring is mounted based on a signal from the detection means. A snap ring installation failure detecting device, comprising a display device for displaying pass / fail status. 2. The detecting means according to claim 1, wherein the light-receiving portion and the light-receiving portion are provided at both ends of a through hole provided in a radial direction of the press-fitting punch, and provided at an intermediate portion thereof and interlocked with the projecting / retracting operation of the detecting punch. 2. The snap ring installation defect detecting device according to claim 1, further comprising a photoelectric sensor provided with a detector for setting the through hole to a communicating state or a closed state. 3. The snap ring installation defect detecting device according to claim 1, wherein the detection punch provided inside the press-fitting punch is configured to be operated by a pneumatic cylinder.