JPH02250731A - Assembly device for snap ring - Google Patents

Abstract

PURPOSE:To judge a normal snap ring assembly by pushing a snap ring into a tapered guide hole, assembling it into a work hole while pressing it for contracting the diameter by a pressure fitting punch, and detecting by air pressure the opening of the implantation hole opening to the pressure fitting punch tip by the ring expansion during the assembly. CONSTITUTION:A guide member 7 is assembled to a work 3. On the guide member 7, a tapered guide hole 9 contracting toward a work hole 4 is formed and a snap ring 2 is inserted. The snap ring 2 is pressed while being contracted by pressing the snap ring 2 side face by a pressure fitting punch 21, expanded and inserted into the ring groove 5 of the work 3. On the pressure fitting punch pressing face the implantation hole 23a released from the ring 2 at the ring expansion time and the implantation hole 23b closed at all times are opened and air pressure is exerted. When the ring 2 is surely expanded, the core pressure ratio of the implantation holes 23a, 23b is changed and so the assembly can be confirmed by the variation thereof.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a snap ring assembly device, and in detail,
The present invention relates to a snap ring assembling device that can detect whether a snap ring is press-fitted into a hole in a workpiece at a proper position.

[Conventional technology]

For example, when a bearing is inserted into a hole in a knuckle arm of an automobile part, a snap ring (2) having a notch (1) as shown in Fig. 5 is placed in the proper position of the hole to prevent the bearing from being removed. I am wearing it. Conventionally, when automatically assembling the snap ring (2) into the hole of the knuckle arm, a snap ring assembling device as shown in FIG. 6 has been used. In Fig. 6, (3) is a workpiece in which an annular groove (5) is formed on the inner peripheral surface of the opening end of the hole (4), such as a knuckle arm of an automobile part, and (6) is a hole in the knuckle arm (3). (4) a bearing fitted inside; (7) a work fitting part (8) consisting of an annular step part (8a) into which the open end of the hole (4) of the ankle arm (3) is fitted; This guide member (7) has a tapered guide hole (9) whose diameter gradually decreases toward the annular step (8a).
The snap ring (2) is guided to the hole (4) of the knuckle arm (3) while the outer periphery of the snap ring (2) is brought into sliding contact with the tapered guide hole (9). be. (10) is a press-fit punch that is arranged so as to be able to make a stroke in the direction along the axis of the tapered guide hole (9) of the guide member (7), and this press-fit punch (10)
Snap ring (2) inserted into the tapered guide hole (9) of the guide member (7) at the annular tip surface (10a) of
Press the -side (2a) of. (1)) is a position detecting means for detecting the forward end position of the press-fit punch (lO), and this position detecting means (1)) is a support rod ( Attach and fix the mounting rod (13) vertically to the tip of the mounting rod (13).
A pressing body (14) is attached and fixed to the lower end of the holder. (15)
is a limit switch disposed near the forward end (lowering end) of the press-fitting punch (10) so as to be able to collide with the pressing body (14).

Then, when assembling the snap ring (2) into the hole (4) of the knuckle arm (3), the guide member (7)
After inserting the snap ring (2) into the
10) Advance. Then, the snap ring (2) becomes
N
radially into the hole (4) of the knuckle arm (3). When the press-fitting punch (10) is located at the forward end, the limit switch (15) is turned on and it is detected that the press-fitting punch (10) is at the forward end. ) is guided into the snap ring (
2) is fitted into the annular groove (5).

By the way, according to the above conventional snap ring assembly device, the tolerance of the knuckle arm (3) or the dirt between the bearing (4) and the inner flange (3a) at the open end of the knuckle arm (3) (15 ) due to the snap ring (2) not fitting into the annular groove (5) of the knuckle arm (3), the limit switch (14)
), it was detected that the press-fitting punch (10) was located at the forward end, and as a result, it was sometimes mistakenly determined that the snap ring (2) had been fitted into the annular groove (5).

Therefore, conventionally, the annular groove (5) of the knuckle arm (3)
) The operator visually confirmed whether the snap ring (2) was inserted into the hole.

Incidentally, as a known technique of a snap ring assembly device, there is one described in Japanese Utility Model Application Publication No. 63-64434.

[Problem to be solved by the invention]

In order to improve the automation rate of production equipment, after attaching the snap ring (2) to the knuckle arm (3), when the shaft is subsequently press-fitted into the bearing (6), the presence of the shaft prevents the attachment of the snap ring (2). A problem occurred in that the condition could not be visually confirmed. Jitsukai 63-64
The known technique described in Japanese Patent No. 434 also has a similar problem.

SUMMARY OF THE INVENTION An object of the present invention is to provide a snap ring assembling device that can automatically check the attached state of a snap ring.

[Means to solve the problem]

The present invention was proposed to achieve the above object, and
A guide member having a tapered guide hole whose diameter decreases toward the hole of the workpiece, and guides the snap ring into the hole of the workpiece while reducing its diameter while sliding the snap ring in concentric contact with the tapered guide hole;
The guide member is arranged to be capable of stroke movement in the direction along the axis of the tapered guide hole of the guide member, and to be able to press one side of the snap ring inserted into the guide member with its distal end surface. A press-fit punch is formed by shifting the first and second landing holes in the radial direction so that they can be closed with a snap ring having a reduced diameter, and air pressure acting on the first and second landing holes of the press-fit punch is individually controlled. radially inward in the first and second landing holes of the press-fit punch when the diameter of the snap ring is expanded by assembling the snap ring into the proper position of the hole of the workpiece. The implantation hole located at the bottom is open to the atmosphere.

[Effect]

When the snap ring is installed in the correct position in the hole of the workpiece, the diameter of the snap ring expands, so depending on whether the diameter of the snap ring expands or not, the first and second landing positions of the press-fit punch will be radially inward. The air pressure at the landing hole located at changes. The attachment state of the snap ring can be detected based on this change in air pressure.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 to 4. Components that are the same as those shown in FIGS. 5 and 6 are designated by the same reference numerals, and their explanation will be omitted.

In FIGS. 1 to 4, (21) is a press-fit punch that is disposed in the Taber guide hole (9) of the guide member (7) so as to be able to stroke in the direction along the axis. ) presses the negative side surface (2a) of the snap ring (2) inserted into the tapered guide hole (9) of the guide member (7). The press-fit punch (21) is formed with first and second landing holes (23a) (23b) that open at the distal end surface (22), and the forward end of the press-fit punch (21) is formed at the forward end of the press-fit punch (21). A position detection means (1)) is provided for detecting the position. The first and second landing holes (23a) of the upper press-fitting punch (21) (
23b) are arranged at positions shifted in the radial and circumferential directions as shown in FIG. ) is closed by the negative side surface (2a) of the snap ring (2), and when the diameter of the snap ring (2) is expanded, the first implantation hole (23a
) is open to the atmosphere, and the second implantation hole (23b) is closed by the negative side surface (2a) of the snap ring (2).
(24) is a landing detection means for individually measuring the air pressure acting on the first and second landing holes (23a) and (23b) of the press-fitting punch (21); teeth,
For example, the above-mentioned implantation holes (23a) (23b) and air s (
25) and the air hose (26) (26a) (26
b) and a valve (27), and the pressure in the air path is individually measured by a pressure switch (28).

Next, the procedure for checking the attached state of the snap ring will be explained as follows.

The hole (4) of the knuckle arm (3) into which the bearing (6) is inserted
), when assembling the snap ring (2) to the knuckle arm (3) to the work fitting part (8) of the guide member (7).
Insert the open end of the hole (4) into the guide member (7).
) After inserting the snap ring (2) into the tapered guide hole (9), the press-fitting punch (21) is advanced. As the press-fitting punch (21) moves forward, the snap ring (2) is pressed by the tip end surface (22) of the press-fitting punch (21), and its diameter is reduced while slidingly contacting the tapered guide hole (9) of the guide member (7). and is guided into the hole (2) of the knuckle arm (3).

Then, the press-fitting punch (21) is not located at the forward end,
If the position of the press-fit punch (21) is not detected by the position detection means (1), the snap ring (2)
Since the diameter is reduced by being pressed by the tip end surface (22) of the press-fit punch (21), the first and second landing holes (23a) (23b) of the press-fit punch (21) are aligned with the snap ring (2). - occluded on the side (2a); Therefore, the air source (2
5) to the air hose (26) (26a) (26
b) and the press punch (21) through the pulp (27)
When air is supplied to the first and second landing holes (23a) (23b), the first and second landing holes (23a) (23b) measured by the pressure switch (28)
) increases, and it is possible to detect insufficient press-fitting of the snap ring (2).

Furthermore, when the press-fitting punch (1) is located at the forward end, the limit switch (15) of the position detection means (1) is turned on.
, it is detected that the press-fit punch (21) is at the forward end, but in this case, the pressure switch (28
) depending on the air pressure measured at the snap ring (
2) It is possible to confirm whether the product is press-fitted into the correct position or whether it is insufficiently press-fitted. That is, as shown in Figure 2,
When the snap ring (2) is fitted into the annular groove (5) of the knuckle arm (3), the diameter of the snap ring (2) expands, so that the first landing hole (23a) of the press-fit punch (21) is exposed to the atmosphere. The second landing hole (23b) is opened and closed by the negative side (2a) of the snap ring (2), so that the air in the first landing hole (23a) measured by the pressure switch (28) is The pressure does not increase, but the second implantation hole (
23b) increases, and it is detected that the snap ring (2) has expanded in diameter and is fitted into the annular groove (5) of the knuckle arm (3). On the other hand, as shown in Fig. 1, the tolerance of the knuckle arm (2) or the gap between the bearing (6) and the inner flange (3a) of the knuckle arm (3).
If the snap ring (2) does not fit into the annular groove (5) of the knuckle arm (3) due to the biting of the snap ring (15), etc., the snap ring (2) has a reduced diameter and the press-fit punch (21) The first and second implantation holes (23a) of
(23b) is the negative side (2a) of the snap ring (2).
) and therefore the pressure switch (28
) The first and second implantation holes (23a) (2
3b) increases, and it is possible to detect insufficient press-fitting of the snap ring (2).

Further, as shown in FIG. 3, when the press-fitting punch (21) moves forward and is located at the forward end without the snap ring (2) being inserted into the tapered guide hole (9) of the guide member (7), Limit switch (position detection means (1))
15) is turned ON and it is detected that the press-fit punch (21) is located at the forward end, but the first position of the press-fit punch (21)
The second implantation holes (23a) (23b) are open to the atmosphere, and therefore the first and second implantation holes (23a) (23b) measured by the pressure switch (28)
) does not increase, and it can be detected that the snap ring (2) is not inserted into the knuckle arm (3).

According to the above embodiment, when the snap ring (2) is press-fitted, the second landing hole (23b) is inserted into the snap ring (2).
When located in the notch (1) of the snap ring (2)
It is not possible to detect whether or not it has been press-fitted into the correct position. Therefore, in order to reliably and accurately detect that the snap ring (2) has been press-fitted into the correct position,
For example, two second landing holes (23b) are provided to be offset in the circumferential direction, and one of the second landing holes (23b) is reliably closed when press-fitting to the proper position. In this case, of course, the first landing hole (23a) is formed. Alternatively, two pairs of first and second landing holes may be provided. Further, in the above embodiment, the case where a snap ring is attached to a knuckle arm has been described, but the present invention is not limited to this, and can be widely used when attaching a snap ring to various types of workpieces. .

(Effects of the invention) According to the present invention, it is possible to accurately and reliably detect whether or not the snap ring is press-fitted into the correct position of the hole in the workpiece, and it is possible to significantly improve work efficiency. .

[Brief explanation of drawings]

FIG. 1 is a partially sectional front view showing an embodiment of the device of the present invention, FIGS. 2 and 3 are partially sectional front views showing the operating state of the device of the present invention, and FIG. 4 is a front view of the first and second implantations. FIG. 3 is an explanatory diagram of the tip end surface of a press-fitting punch in which a hole is formed. FIG. 5 is an explanatory diagram of a snap ring, and FIG. 6 is a partially sectional front view showing a conventional snap ring assembly device. (2) -Snap ring, (3)--Work, (4
)・−・hole, (7) −guide member,
(9) - Taper guide hole, (21) - Press fit punch, (22) - Tip surface,
(23a) (23b) - Implantation hole, (24) - Implantation detection means.

Claims (1)

[Claims] (1) A guide member that has a tapered guide hole that reduces in diameter toward the hole in the workpiece, and guides the snap ring into the hole in the workpiece while reducing its diameter while sliding concentrically into the tapered guide hole. , is arranged to be capable of stroke movement in a direction along the axis of the tapered guide hole of the guide member, and to be able to press one side of the snap ring inserted in the guide member with a tip end surface, and is open to the tip end surface. A press-fit punch is formed by shifting the first and second landing holes in the radial direction so that they can be closed with a snap ring having a reduced diameter, and the air pressure acting on the first and second landing holes of the press-fit punch is individually controlled. When the diameter of the snap ring is expanded by assembling the snap ring into the proper position of the hole of the workpiece, the diameter of the hole in the first and second landing holes of the press-fit punch is measured in the radial direction. A snap ring assembly device characterized in that a landing hole located on one side is opened to the atmosphere.