JPH07189627A - Valve oil leakage inspecting device in cylinder head - Google Patents

Abstract

PURPOSE:To detect accurate positioning of a workpiece and correct mounting thereof on a reference seat, to execute proper oil leakage inspection and to detect drilling of a hole having a specified depth in the workpiece or tap erection. CONSTITUTION:An oil leakage inspecting device is provided with a rising and descending unit 2 having a clamping surface 9a for clamping a workpiece W and push-pressing mechanisms 10a and 10b held by the raising and lowering unit 2 and set on the axes of intake and discharging valves 37 and 38 of the workpiece W for push-pressing the heads thereof by the descending of the unit 2. This device is also provided with a workpiece posture detecting mechanism 11 having a freely advancing and retreating detecting pin 28 held by the unit 2 and inserted into a hole 34 formed in the A workpiece W before the clamping surface 9a comes into contact therewith for detecting the posture thereof.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inspection device for inspecting the posture of a cylinder head of an engine and inspecting pressure leakage of intake and exhaust valves.

[0002]

2. Description of the Related Art When a cylinder head (workpiece) is placed on a reference seat with a reference pin as a reference in a pressure leak inspection process for intake and exhaust valves, the reference pin sometimes comes out of a hole provided in the work, Alternatively, since the work is placed with foreign matter such as chips remaining on the reference seat, this work cannot be positioned in an appropriate posture, and even in the conventional state, the work is pressed from above and forced to force it. Had been positioned.

[0003]

As described above, since the work is forcedly positioned by pressing the work from above without positioning the work in a proper posture, the hole around the hole is crushed by the reference pin, or There was a problem that chips were pressed against the work. Further, when the pressure leak inspection of the intake and exhaust valves is executed in such a state, the pressing point of the valve head changes, and accordingly, the amount of leakage changes, which causes a problem that proper inspection cannot be performed.

Therefore, when setting the work on the reference seat, the operator must always pay attention to whether any chips remain on the reference seat, and moreover, the work is surely set as the reference even after the work is set. It was necessary to manually confirm whether the pin was inserted.

The present invention solves the above-mentioned problems, and its purpose is to determine whether or not the workpiece to which the valve is assembled is reliably positioned and satisfactorily placed on the reference seat. It is possible to detect whether or not the work has a hole with a specified depth or is tapped. An object of the present invention is to provide a pressure leakage inspection device for a valve in a cylinder head.

[0006]

In order to achieve the above-mentioned object, the present invention provides an elevating unit having a clamping surface for clamping a work, and an elevating unit which is held by the elevating unit and arranged on the axis of a valve of the work. A pressing mechanism that presses the head of the valve when the unit descends, and a pressing mechanism that is held by the elevating unit and can be inserted into the hole drilled in the work before the clamp surface contacts the work to detect the posture of the work. And a work posture detection mechanism having a detection pin that can move back and forth.

[0007]

Therefore, according to the present invention, with the above configuration,
By inserting a detection pin into a relatively deep hole drilled in the work, the small inclination of the work is inspected, and drill breakage in the hole, unprocessed hole, and chip clogging are detected. In addition, the positioning of the workpiece can be reliably detected,
Accurately perform a pressure leak check on the valve.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a partially cutaway front view of a valve pressure leak inspection apparatus in a cylinder head according to the present invention, FIG. 2 is a side view with the pressure leak inspection apparatus partially omitted, and FIG. 3 is an example of the pressure leak inspection apparatus. It is the top view which abbreviate | omitted.

A valve pressure leak inspection apparatus for a cylinder head according to the present invention comprises a reference seat mechanism section 1 and an elevating unit 2. The reference seat mechanism portion 1 has a plurality of reference seats 4 provided on the upper surface of the base 3, and one of these reference seats 4 on the left side is a reference seat that projects above the reference surface 5. A pin 6 is provided.

The elevating unit 2 is provided with upper and lower holder portions 7 and 8, and a holding block 9 is attached to the lower surface of the lower holder portion 8 via an intermediate block 25. The lower surface is formed as a clamp surface 9a. The upper holder 7 is provided with left and right pressing mechanisms 10a and 10b, and the lower holder 8 is provided with a work posture inspection mechanism 11.

The pressing mechanism 10a on the left side is located on the extension of the axis of the valve (exhaust valve) on the right side of the cylinder head, which will be described later, and is inclined to the left. The right pressing mechanism 10b is located on the extension of the axis of the left valve (intake valve) of the cylinder head and is inclined to the right.
The left and right pressing mechanisms 10a and 10b include a cylinder portion 12 connected to the drive source portion 13, and a piston (not shown) is fitted in the cylinder portion 12 and a rod 14 connected to the piston is inserted. Protrudes to the outside of the cylinder portion 12, a spring receiving portion 15 is formed at the end of the rod 14, and a spring 16 is interposed between the spring receiving portion 15 and the cylinder portion 12. . And rod 1
A pressing pin 17 is connected to the position 4. The pressing pins 17 are provided on the intermediate block 25 and the pressing block 9.
And is inserted into a hole (not shown) formed in the above and penetrating downward.

The work posture inspection mechanism 11 includes four inspection mechanism portions 19 provided at four corners of the lower holder portion 8. Each of these inspection mechanism units 19 includes a holding cylinder body 20 provided in the lower holder unit 8, and a pin holder 21 is inserted into the holding cylinder body 20 so as to be vertically movable. A key groove 21a is formed on an outer peripheral portion of the key 21 along the axial direction thereof, and the key 22 provided on the holding cylinder 20 is provided in the key groove 21a.
Has been inserted. The upper end portion of the pin holder 21 has a large diameter, and the lower surface of the large diameter portion 23 is a stopper 23a.
It has become.

A spring locking pin 24 is attached to the outer peripheral portion of the large diameter portion 23, and a spring locking member 26 is attached to the intermediate block 25 fixed to the lower holder portion 8. A spring 27 is passed between the spring locking member 26 and the spring locking pin 24, and the spring force of the spring 27 urges the pin holder 21 downward so that the stopper 23 a moves to the upper end of the holding cylinder 20. Is in contact with the part.

The detection pin 2 is provided below the pin holder 21.
The upper end of 8 is connected, and the detection pin 28 is guided by the guide member 29 and protrudes below the pressing block 9. The guide member 29 is fixed to the intermediate block 25, and the lower portion thereof has a tubular shape.
Penetrates the reference block 9. Further, a proximity switch 31 is provided on the upper surface of the lower holder portion 8 via a holding bracket 30, and the proximity switch 31 is close to the outer peripheral portion of the large diameter portion 23 of the pin holder 21.

A reference pin hole 33 is formed on the lower surface of the cylinder head 32 of the engine, which is the work W, and a hole 34 is formed on the upper surface of the cylinder head 32. Also,
Air supply members 35 are connected to the import side and the exhaust side of the cylinder head 32, and air supply holes 36 are formed in these air supply members 35. An intake valve 37 and an exhaust valve 38 are provided inside the cylinder head 32 in a state of being respectively seated on a valve seat 39.

Next, the operation of the valve pressure leakage inspection device in the cylinder head will be described. (Posture Inspection of Work W) When the work W is placed on the reference seat 4 with the reference pin 6 as a reference, the elevating unit 2 starts to descend by a drive source (not shown). When the lifting unit 2 descends, the detection pin 2 of the work posture inspection mechanism 11
8 is inserted into the hole 34 of the work W to detect the posture and the drilling state of the work W.

At this time, for example, when the work W is placed on the reference seat 4 with a relatively large amount of chips S remaining on the reference seat 4 on the right side as shown in FIG. Since the other detection pin 28 is locked near the entrance of the hole 34 and the elevating unit 2 continues to move downward, the elevating unit 2 moves downward against the spring 27 with the detecting pin 28 left. The large-diameter portion 23 of the pin holder 21 comes out of the detection range of the proximity switch 31, and the abnormal posture of the work W is detected before the work clamp.

This is almost the same as the above-mentioned abnormality detection of the work posture, but as shown in (1) of FIG. 4, when the posture of the work W is a little unsuitable, the detection pin 28 has a hole 34 in the work W.
The abutting against the wall surface 34a of the above, the lowering movement of the elevating unit 2 is prevented, and then the abnormal posture of the work W is detected before the work clamping as described above.

Even if the work W is properly oriented, for example, as shown in FIG. 4B, if the hole 34 is not properly drilled by breaking the drill 40, or the hole 34 is proper. Despite being pierced by
When chips are accumulated at the bottom of the hole 34, the lowering movement of the lifting unit 2 is prevented, and as described above, the abnormal posture of the work W is detected before the work clamp.

(Valve Pressure Leakage Inspection of Work W) Work W
Is properly positioned and properly positioned, the detection pin 2
When 8 is satisfactorily inserted into the hole 34, the clamp surface 9a of the pressing block 9 contacts the upper surface of the work W to clamp the work W. At this time, the pressing pins 17 of the pressing mechanisms 10a and 10b contact the head centers of the intake and exhaust valves 37 and 38, respectively. In the pressing mechanisms 10a and 10b, for example, hydraulic oil from the drive source section 13 is introduced into the cylinder section 12 to exert an acting force on the piston, and the rod 1
The pressing pin 17 is forcibly pushed through the position 4.

When the elevating unit 2 is stopped with the pressing pin 17 in contact with the center of the head of the intake and exhaust valves 37, 38, respectively, the drive source unit 13 operates to release the acting force on the piston. The pressing pin 17 is pressed only by the compression force of the spring 16, and the intake and exhaust valves 37 and 38 are brought into pressure contact with the valve seat 39 via the pressing pin 17. In this state, air having a constant pressure is made to flow into the import side and the exhaust side from the air supply hole 36 of the air supply member 35, and the leakage of the intake and exhaust valves 37, 38 is inspected by the change of the air pressure.

[0022]

As described above in detail, according to the present invention, the detection pin can be inserted into the relatively deep hole formed in the work to properly inspect even the small inclination of the work. In addition, it is possible to detect breakage of the drill in the hole, unprocessed hole, and clogging of cutting chips.

Further, by detecting the above-mentioned abnormality of the work before clamping the work, it is possible to provide a work of good quality without making scratches or dents on the work. Also, since the workpiece positioning can be detected reliably,
The pressure leak inspection of the valve can be executed accurately, and a work of good quality can be provided.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view of a valve pressure leak inspection apparatus in a cylinder head according to the present invention.

FIG. 2 is a side view of the pressure leak inspection apparatus with a part thereof omitted.

FIG. 3 is a plan view of the pressure leak inspection apparatus with a part thereof omitted.

FIG. 4A is a sectional view showing a state in which the detection pin is in contact with the wall surface of the hole of the work when the posture of the work is a little unsuitable. FIG. 2B is a cross-sectional view showing a state in which the detection pin is inserted into the hole when the hole of the work is not properly drilled due to the breakage of the drill.

[Explanation of symbols]

 2 Lifting unit 9a Clamping surface 10a, 10b Pressing mechanism 11 Work posture detecting mechanism 28 Detection pin 34 Hole 37 Intake valve (valve) 38 Exhaust valve (valve) W Work

Claims (1)

[Claims] 1. An elevating unit having a clamping surface for clamping a work, a pressing mechanism which is held by the elevating unit and is arranged on the axis of the valve of the work and presses the head of the valve when the elevating unit descends. A work posture detection mechanism that has a detection pin that can be inserted into a hole formed in the work before it is held by the lifting unit and abuts on the work and that can detect the posture of the work A pressure leak inspection device for a valve in a cylinder head.