JPH0537235Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a clamp mechanism that is installed in a leak testing device that inspects leaks in a seal part, seals the seal part, and supplies air to the inside. The present invention relates to a clamp mechanism of a leak inspection device suitable for inspecting leaks in a front oil seal of a crankshaft of an automobile engine.

[Conventional technology]

Leak inspection devices that are installed between the crankshaft that protrudes from the front of the housing of an automobile engine and the front of the housing to check for leaks in the front oil seal, which is used to prevent oil leaks inside the engine, have conventionally been installed in the front oil seal. It was configured as shown in Figure 7. In the figure, a crankshaft 2 protrudes from the front of an engine 1, and a front oil seal 4 is installed between the crankshaft 2 and a cover 3 provided on this protrusion. During assembly of the engine 1, the front oil seal 4 is inspected for leaks on a chain roller conveyor (not shown).

The leak testing device 5 is fixed on a base 6 provided at a predetermined position above the roller conveyor. A cylinder mounting plate 7 is fixed on the base 6 with bolts 8, and an air cylinder 9 is mounted at right angles to the cylinder mounting plate 7. Further, guide rods 11 are slidably provided on the cylinder mounting plate 7 in parallel with the air cylinder 9 and on both sides of the air cylinder 9 via metals 10, respectively. A plate 13 is fixed to the lower end of each of these guide rods 11 via a socket 12 in parallel to the cylinder mounting plate 7.

This plate 13 has a metal 16 that supports a clamp rod 15 having a clamp rubber attachment jig 14 fixed to its lower end so as to be slidable in a direction perpendicular to the plate 13.
is fixed. Further, a clamp rubber 17 is installed in the clamp rubber installation jig 14 to contact and seal the front oil seal 4 and cover 3 of the engine 1, and a clamp rubber 17 is installed between the plate 13 and the clamp rubber installation jig 14. A spring 18 is attached to urge the mounting jig 14 downward. A collar 19 is provided at the upper end of the clamp rod 15 and engages with the upper end surface of the metal 16 to restrict the lower end of the clamp rod 15. Furthermore, an air hose 20 that penetrates into the clamp rubber 17 is attached to the clamp rubber attachment jig 14. Further, the lower end of the rod 21 of the air cylinder 9 is fixed to the plate 13 via a socket 22.

The conventional leak inspection device configured as described above lowers the plate 13 using the air cylinder 9, and simultaneously lowers the clamp rubber mounting jig 14 attached to the plate 13 so as to be able to move up and down, thereby increasing the biasing force of the spring 18. Mounting jig 14
The clamp rubber 17 attached to the engine 1 is brought into contact with the front oil seal 4 and cover 3 of the engine 1 to seal these parts. Thereafter, compressed air is supplied into the clamp rubber 17 through the air hose 20, and a leak test is performed using the back pressure.

In addition, as a positioning device that can be applied to this type of device, as described in Japanese Patent Application Laid-Open No. 180751/1982, there is a positioning mechanism that extends in the workpiece processing direction from a key point of the workpiece processing bottle system, and 2. Description of the Related Art A positioning device is known which includes a floating means having a floating base equipped with a workpiece processing robot.

[The problem that the idea aims to solve]

However, according to the conventional leak testing device 5 shown in FIG.
There was a problem in that misalignment occurred, resulting in poor sealing and leakage of compressed air, making it impossible to perform accurate leakage tests.

Another disadvantage is that when the crank rubber 17 descends, it comes into contact with the stepped portion of the crankshaft 2 and cover 3, and the tip of the crank rubber 17 is damaged, making inspection impossible and requiring replacement of the crank rubber 17. It was hot. As a result, the device stops and
There were problems such as production delays due to line stoppages and increased maintenance costs.

Note that the proposal in the above-mentioned publication involves floating the board on which the robot is mounted using air or the like and positioning it using reference pins, and no consideration was given to leakage testing as in the present invention.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a clamping mechanism for a leak testing device that can completely seal and clamp the sealed portion of a member to be tested, and that can easily perform accurate leak testing. With the goal.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a clamp mechanism for a leak testing device that presses a clamp member against a seal portion of a member to be inspected, supplies air into the clamp member, and tests for leaks in the seal portion. A cylinder mounting plate to which a pressure cylinder that presses the clamp member is attached is provided with an elevating cylinder and several sub guide rods that can be raised and lowered parallel to the pressure cylinder, and the guide rod is provided with the cylinder mounting plate parallel to the cylinder mounting plate. An upper plate that is raised and lowered by a lifting cylinder is fixed, a lower plate is attached to the upper plate via the guide rod so as to be movable in a parallel direction, and a positioning member and the clamp member are respectively attached to the lower plate. It is characterized in that it is movable in a direction perpendicular to the lower plate.

[Effect]

According to the above configuration, when the upper plate is pushed down by the lifting cylinder fixed to the cylinder mounting plate, the lower plate is also lowered at the same time, and the positioning member provided on the lower plate engages with the reference point of the member to be inspected.

At this time, even if the inspected member is misaligned with respect to the leak testing device, the lower plate is movable parallel to the upper plate, so the lower plate will not be misaligned with respect to the inspected member. accurately positioned. After that, if you operate the pressure cylinder and press the clamp member against the seal part of the part to be inspected, this clamp member is kept at a constant position in the plane direction of the lower plate, so it is concentric with the seal part. This makes it possible to completely seal the seal portion, prevent damage to the clamp member, and perform leakage tests accurately.

[Embodiment] Hereinafter, an embodiment of the leak testing device according to the present invention will be described with reference to the drawings.

An embodiment of the present invention is shown in FIGS. 1 to 4.
In the figure, parts that are the same or equivalent to those of the conventional example shown in FIG. 7 are designated by the same reference numerals.

The inner surface of the centering cup 24, which is formed in a substantially cylindrical shape, has a tapered shape that widens downward as shown by the dotted line. This centering cup 24 is fixed to the lower end of a centering rod 25, and this centering rod 25 is slidably supported in the axial direction by a centering cup metal 28 fixed to the lower surface of the lower plate 26 with a socket bolt 27. ing. Further, a cup collar 29 is fixed to the upper surface of the lower plate 26 through which the centering rod 25 can slide freely.
1 is fixed. and the centering cup 2
A coiled cup spring 32 is installed between the upper surface of the metal 4 and the lower surface of the metal 28, and the retaining collar 31 is attached to the cup collar 29.
It is biased in the direction of contacting the upper end surface of.

The cylindrical clamp rubber 17 is fitted into a cylindrical clamp rubber mounting jig 14 whose upper end surface is closed, and the air hose 20 provided on this mounting jig 14 penetrates inside the clamp rubber 17. There is. This mounting jig 14 is fixed to the lower end of a clamp rod 15, and this clamp rod 15 is slidably supported in the axial direction by a clamp rubber mounting jig metal 16 fixed to the lower surface of the lower plate 26 with a socket bolt 33. has been done. Further, a jig spring stopper collar 34 is fixed to the upper end of the clamp rod 15 by a socket bolt 35.

A coiled jig spring 3 is disposed between the lower surface of the collar 34 and the upper end surface of the metal 16.
6 is attached, and the upper end surface of the collar 34 is urged in a direction to come into contact with a rod flange 21a provided at the lower end of the rod 21 of the pressing cylinder 9, which will be described later.

On the other hand, a cylinder mounting plate 7 is fixed to a base 6 provided at the upper part of a chain conveyor (not shown) on which the engine 1 is transported, and a cylinder mounting plate 7 has a cylinder mounting plate 7 in a direction perpendicular to the plate 7. The pressing cylinder 9 and the lifting cylinder 37 are each fixed. Further, a pair of guide rod metals 10 fixed to the cylinder mounting plate 7 with socket bolts 38 each support a guide rod 11 so as to be slidable in parallel to the stroke direction of the cylinders 9, 37.

The lower end of these guide rods 11 is attached to the lower plate 26 and an upper plate 39 which is disposed parallel to the upper part of the lower plate 26 at a predetermined interval. is the rod 40 of the lifting cylinder 37.
A rod flange 41 to which the lower ends of the rods are connected is fixed by a socket bolt 42.

Furthermore, a space 43 is formed between the upper outer periphery of the guide rod 11 and the inner periphery of the guide rod metal 10, as shown in FIG. Teing is now possible. Further, the guide rod 11 and the upper plate 39 are fixed at a predetermined position, and a guide rod retaining collar 44 is fixed to the lower end surface of the guide rod 11 by a socket bolt 45.

between the outer circumference of the lower end of the guide rod 11 and the inner circumference of the mounting hole of the lower plate 26;
A space 46 is formed between the lower surface of the guide rod retaining collar 44 and the upper surface of the guide rod retaining collar 44, and the guide rod 11 and the lower plate 26 can be slightly floated relative to each other.

Further, the upper plate 39 has through holes 39a and 39b through which the cup collar 29 and the jig spring 36 can pass while floating.
b is formed.

Free bearings 47 are fixed to each of the four corners of the lower plate 26 with bolts 48, and support the upper plate 39 so as to be movable in a direction parallel to the lower plate 26. In addition, near two opposing sides of the upper plate 39, a pair of lower plate holding metal rods 49 are provided as shown in FIG.
is fixed by a socket ball 50, and each lower plate holding rod 5 is attached to this metal 49.
1 is slidably mounted on the lower plate 26 in a right angle direction. A lower plate retaining spring 5 is attached to the upper part of these lower plate retaining rods 51.
The lower end of this spring 52 is engaged with the upper end surface of the metal 49, and the upper end is engaged with a socket ball 54 screwed onto the upper end of this retaining bar 51 via a retaining bar spring retaining collar 53. It has been stopped.

Further, a tapered portion 55 whose diameter increases downward is formed at the lower end of the holding rod 51, and this tapered portion 55 penetrates the lower plate 26 and projects downward. Lower plate 2 at this penetration part
A holding rod receiver 56 is provided on the bottom surface of the socket ball 5.
7, and the inner peripheral portion of the lower surface of the holding rod receiver 56 has a tapered shape with which the tapered portion 55 at the lower end of the holding rod 51 engages.

Furthermore, a space 58 is formed between the inner periphery of the holding rod receiver 56 and the outer periphery of the holding rod 51, so that the lower plate 26 can float relative to the holding rod 51. The tapered portion 55 at the lower end of the holding rod 51 is brought into contact with the tapered portion of the holding rod receiver 56 due to the biasing force of the holding spring 52 .

Next, the operation of this embodiment will be explained. engine 1
stops at a fixed position on the chain conveyor, and when the upper plate 39 and lower plate 26 are lowered by the lifting cylinder 37, the leak inspection device main body 5
8 and the engine 1 are in the off-center position, the tapered portion 24a on the inner surface of the centering cup 24 descends while contacting the belt pulley 59, which serves as a reference for centering the engine 1, as shown in FIG. . As a result, the centering cup 24 and the lower plate 26, which are integrally connected via the centering rod 25, move in a direction opposite to the eccentricity, for example, in the direction of arrow A. At the same time, a holding rod receiver 56 is fixed to the lower plate 26.
The tapered portion and the tapered portion 55 at the lower end of the holding rod 51 slide, and the holding rod 51 is lowered against the biasing force of the spring 52. As a result, lower plate 2
6 is pressed against the upper plate 39, but it can freely move lightly in any direction due to the free bearing 47, allowing accurate positioning by centering the engine 1 and the leak test device main body 58.

After centering the leak test device main body 58 with respect to the engine 1 as described above, the press cylinder 9
The rod flange 21a provided at the tip of the rod 21 presses the collar 34 at the upper end of the clamp rod 15, compresses the jig spring 36, and lowers the clamp rubber 17 until it comes into contact with the cover 8.

Next, compressed air is supplied into the clamp rubber 17 through the air hose 20, and the spinal pressure is measured with a meter to perform a leak test. After the inspection is completed, the rod 21 is raised by the pressing cylinder 9, and the clamp rod 15 is
to separate from As a result, the jig spring 36
The clamp rubber 17 rises due to the biasing force and separates from the cover 3 of the engine 1. Next, the upper plate 39 and the lower plate 2 are moved by the lifting cylinder 37.
6 is raised, and the holding rod 51 is returned to its original position via the tapered portion 55 at the lower end by the urging force of the holding spring 52.

According to this embodiment, misalignment between the leak test device main body 58 and the front oil seal 4 of the crankshaft 2 of the engine 1, which is the member to be inspected, is reliably corrected, and the sealing accuracy by the clamp rubber 17 is improved. This allows for accurate leak testing.

In the above embodiment, the leak inspection device for the front oil seal 4 provided on the crankshaft 2 of the engine 1 has been described, but the present invention can also be used for other inspection devices, bolt tightening devices, etc.

[Effect of idea]

As explained in detail above, according to the present invention, the clamp member and the positioning member that are pressed against the seal portion of the member to be inspected can be floated together with respect to the main body of the leak test device. Misalignment between the main body and the member to be inspected can be easily and reliably corrected, the sealing accuracy by the clamp rubber can be improved, and accurate leakage tests can be performed.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an embodiment of the clamping mechanism of the leak testing device according to the present invention, Fig. 2 is a front view of Fig. 1, and Figs. 3 and 4 are enlarged portions of the main parts of Fig. 2. 5 is a front view showing the operation of this embodiment, FIG. 6 is an enlarged partial sectional view of the main part of FIG. 5, and FIG.
The figure is a perspective view showing a conventional leak testing device. 1...Engine (member to be inspected), 4...Front oil seal, 5, 58...Leak inspection device,
7... Cylinder mounting plate, 9... Pressing cylinder, 11... Guide rod, 17... Clamp rubber (clamp member), 24... Centering cup (positioning member), 26... Lower plate, 37... Lifting Cylinder, 39...upper plate.

Claims (1)

[Scope of utility model registration request] In a clamp mechanism of a leak testing device that presses a clamp member against a seal portion of a member to be inspected and supplies air into the clamp member to inspect leaks in the seal portion, a pressure cylinder that presses the clamp member is attached. An elevating cylinder and a plurality of guide rods that can be freely raised and lowered are provided on the cylinder mounting plate parallel to the pressing cylinder, and an upper plate that is raised and lowered by the elevating cylinder is fixed to the guide rod parallel to the cylinder mounting plate. death,
A lower plate is attached to the upper plate so as to be freely movable in a parallel direction via the guide rod, and a positioning member and the clamp member are each provided on the lower plate so as to be movable in a direction perpendicular to the lower plate. The unique clamping mechanism of the leak testing device.