JPH0769014B2 - Laminated gasket - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of use) The present invention relates to an erroneous assembly detection section in a laminated gasket formed by stacking a plurality of constituent plates on top of each other.

(Problems to be solved by the related art and the invention) It is determined from the outside whether or not a laminated gasket in which a plurality of constituent plates having almost the same shape are superposed and integrally bonded is superposed as designed. In order to be able to do so, the misassembly discrimination structure in which at least a part of one side of the component plate is sequentially arranged in a stepwise manner and exposed to the outside is disclosed in Japanese Utility Model Laid-Open No. 62-1142.
Proposed in No. 70. This erroneous assembly discriminating structure is excellent for discriminating erroneous assembly by the visual inspection by the operator, but when the number of constituent plates is large, the
Even if a sheet is missing, it is easily overlooked, and it is not necessarily suitable for automatic inspection performed by using optical means during or outside the gasket assembly line. This is because not only is optical detection and discrimination of a large number of stair-like arrangements difficult, but misjudgment is likely to occur.

INDUSTRIAL APPLICABILITY The present invention can easily optically detect and discriminate a missing plate gasket in which a part of the constituent plates of the gasket is missing, and also enables automatic detection of an error in the stacking order of the constituent plates. The present invention proposes a laminated gasket including an erroneous assembly detector.

(Means for Solving the Problems) A laminated gasket of the present invention is composed of a number of detection units at least equal to the number of constituent plates in a laminated gasket formed by stacking a plurality of constituent plates on top of each other, and each detection unit performs each detection. It is characterized in that each section is provided with an erroneous assembly detection section in which a through hole for allowing light to pass through is provided in each constituent plate other than the different detection target plate.

(Operation) In the gasket of the present invention, at least as many detecting portions as the number of constituent plates are provided on the gasket, and each detecting portion of each detecting portion transmits light to each constituent plate other than the different detection target plate. Since a hole is provided, in a normal gasket with no missing plate, the detection target plate in each detection unit blocks light, and even if light is projected from one surface side of the gasket in each detection unit, the light is on the opposite surface side. Does not pass to
If the gasket has a missing plate that lacks a part of the component plate, there will be nothing that blocks light in the detection unit that uses the missing component plate as the detection target plate. Light projected from one side passes to the opposite side. Therefore, it is possible to easily and automatically detect and determine the presence or absence of the missing plate by the passage or non-passage of light.

In addition, the erroneous assembly detection unit is not limited to the case of a simple missing plate in which the second plate is missing and the gasket is composed of three constituent plates, for example, in the case of a gasket composed of four constituent plates. In the case of a complicated missing plate in which the plate is missing, but the number of the third plate is four, which is the normal number of the constituent plates of the gasket, instead of the light which detects the second plate Since there is no component plate that blocks light as in the case of a simple missing plate in the detection unit, the same detection can be performed.

Furthermore, when the stacking order of the gasket component plates is incorrect, the distance from the front or back surface of the gasket to the detection target plate, that is, the detection target Since the depth of the holes up to the plate is different from that in the case where the plates are assembled correctly in order, the depth of the holes or the change in the depth of the holes at each detection part can be optically detected from the front surface or the back surface of the gasket or both surfaces. By mechanically or mechanically detecting the change of the order of the constituent plates. That is, the erroneous assembly detecting section in the laminated gasket of the present invention can detect not only the above-mentioned missing plate but also an error in the stacking order.

(Embodiment) The present invention shows a plan view of a part of a cylinder head gasket formed by laminating four metal plates provided with the misassembly detection part of the invention, and FIG. 2 shows the misassembly detection part. Sectional view (first
It is a sectional view taken along line A-A). In the figure, G is a cylinder head gasket, 1 is a cylinder bore, 2 is a bolt hole, and 3, 4, 5 and 6 surrounded by dotted lines are four detecting portions provided with gaskets. As shown in FIG. 2, the gasket is composed of four sheets, an upper plate A, an intermediate B and C and a lower plate D. Either one of the intermediate plates B and C is usually composed of a bead plate provided with beads for reinforcing the seal. The thickness of each of these components is usually 0.15 to 0.3 mm
It is a degree. In the detection unit 3 having the upper plate A as a detection target plate, through holes 3b, 3c, 3d are provided in each of the constituent plates B, C and D other than the constituent plate A which is the detection target plate. In the detection unit 4 having the intermediate plate B as a detection target plate, through holes 4a, 4c, 4d are provided in each of the constituent plates A, C and D other than the detection target plate B. Similarly, in the detection unit 5 in which the intermediate plate C is the detection target plate, through holes 5a, 5c, 5d are provided in the constituent plates A, B and D,
In the detection unit 6 having the lower plate D as the detection target plate, the constituent plates A,
Through holes 5b, 5b, 5d are provided in B and D, and the through holes 6 are formed in the constituent plates A, B, and C in the detection unit 6 in which the lower plate D is the detection target.
a, 6b and 6c are provided.

Therefore, in the case where light is projected to each detection unit from the upper plate A side by a light projector, and when the gasket is assembled normally without any missing component plates as shown in FIG. Is blocked by the component plate A, the component plate B in the detection unit 4, the component plate C in the detection unit 5, and the component plate D in the detection unit 6, and the light is blocked by the light receiver on the lower plate D side. Do not reach If the component C is missing,
In the detection units 3, 4 and 6, light is blocked by the respective detection target plates A, B and D and does not pass to the opposite side, but in the detection unit 5 in which the constituent plate C is the detection target plate, the light is blocked. Since no component plate is provided, the light passes through the detector 5 and reaches the light receiver on the lower plate D side, so that the missing plate can be automatically detected. The same applies to the case where the constituent plate C is chipped and the two constituent plates B are superposed instead.

The above-mentioned through holes need only be small holes with a diameter of about 4 mm as long as it is possible to determine whether light passes or does not pass through when detecting a missing plate.As a matter of course, a place that does not affect the gasket sealing function It is provided outside the auxiliary beat line that runs nearby. The shape of the hole is not limited to the round hole. Also, the detectors may be provided at dispersed positions on the gasket surface due to the gasket design, but if the detectors are arranged in a line, the gasket will move in the assembly line or automatic inspection line. This is convenient because each detector can be inspected one after another by a set of a light transmitter and a light receiver. In this case, a detection function checker may be provided in which all the constituent plates are provided with through-holes side by side with the above-mentioned detectors so that it can be constantly checked whether the projector and the receiver are operating normally.

The above has described the case of detecting an erroneous assembly in which a part of the constituent plates of the laminated gasket is missing. However, by using the erroneous assembly detecting unit provided in the gasket of the present invention, the overlapping of the constituent plates is performed. It is also possible to detect erroneous assembly when the order of is incorrect, for example, when the intermediate B and the intermediate C are exchanged. That is, when the gasket is normally assembled as shown in FIG. 2, assuming that the thicknesses of the respective constituent plates are all 0.2 mm, the distance from the surface of the upper plate A in the detecting portion 4 is The depth of the hole is 0.2 mm, and the depth of the hole from the surface of the lower plate D is 0.4.
mm. In the detector 5, the depth of these holes is 0.4 mm and 0.2 mm, respectively. If the assembly order of the gaskets is wrong and the constituent plates B and C are interchanged, the depth of the holes from the surface of the upper plate A in the detection section 4 is 0.
The depth of the hole from the surface of the lower plate D changes to 4 mm and to 0.2 mm. The depth of the holes in the detector 5 is 0.2mm and 0.4mm, respectively.
Turns into. The depth of the holes in the detectors 3 and 6 does not change. Therefore, if the depths of the holes from the surface of the upper plate A or the depths of the holes or the changes in the depth of the holes from the surface of the lower plate D in each detection unit are detected, the order is changed. In the detection units 5 and 6 having the plates B and C as the detection target plates, since the depths of the holes are different from those in the normal case where the holes are superposed in order, the replacement of the constituent plates can be detected. To detect the depth of the hole or the change in the depth, for example, a small-diameter spot of the laser beam is tilted slightly from the vertical and projected onto a component plate having no through hole of the detection part, and its reflection is reflected. Various publicly known methods such as a method of detecting by a change in the position of light, an optical method such as a detection method utilizing interference between projected light and reflected light, a mechanical method utilizing a depth gauge, various electrical methods, etc. Can be used. Even when using a depth gauge, one of the detectors with the replaced component plate as the detection target plate has a shallower hole compared to the normal case, so the gauge does not rise. The change in the depth of the hole can be automatically detected by optical detection or by activating a contact-type or non-contact-type microswitch at the tip of the gauge. For detection using an optical method, for example, high precision laser displacement meter LC manufactured by Keyence Corporation
A commercially available automatic measuring device such as a series can be used.

(Effects of the Invention) By providing the above-mentioned erroneous assembly detection section on the laminated gasket composed of a plurality of component plates, even if a part of the gasket component plate is erroneously omitted at the time of gasket assembly, the assembly line It is possible to easily and reliably automatically detect and discriminate by an optical means in the middle or the inspection line. Further, even if the component plates are replaced in the wrong order, the error can be automatically detected and determined.

[Brief description of drawings]

FIG. 1 is a plan view of a part of a cylinder head gasket provided with a misassembly detector of the present invention, and FIG. 2 is a sectional view taken along the line AA of FIG. (Explanation of symbols) 3,4,5 and 6 ... Detection unit, 3b, 3c, 3d, 4a, 4c, 4d, 5a, 5b, 5d,
6a, 6b and 6d ... through holes, A ... upper plate, B and C ... intermediate plate, D ... lower plate.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hiroo Takeseki, Hiroro Takeseki 1-5-2 Fukaminishi Yamato-shi, Kanagawa Nihon Rheinz Co., Ltd. (56) Reference JP-A-3-255274 (JP, A) Kai 62-159866 (JP, A) Actual flat 1-165857 (JP, U) Actual 63-82863 (JP, U)

Claims (1)

[Claims] 1. A laminated gasket comprising a plurality of constituent plates superposed on each other, comprising at least as many detecting parts as there are constituent plates, and each detecting part has a different detection target plate than each detecting part. A laminated gasket characterized in that each component plate is provided with an erroneous assembly detection section provided with a through hole through which light passes.