JPH0443005A - Oxygen sensor plate stacking device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application This invention relates to a plate stacking device for an oxygen sensor used in internal combustion engines and the like.

B. Conventional technology An oxygen sensor is sometimes installed in the exhaust pipe of an internal combustion engine to determine the air-fuel ratio of the air-fuel mixture, but this oxygen sensor is made by laminating multiple plates made of ceramics such as zirconia oxide. The laminated plates are then joined together by applying pressure and then cut to a predetermined size.

When manufacturing such a laminated oxygen sensor, it is desirable to uniformly apply pressure to the entire surface of the laminated plates to prevent them from shifting laterally and to prevent the plates from peeling off from each other. .

As a conventional plate stacking device for this type of oxygen sensor, the one shown in FIG. 5 is known. In the same figure, 1
is a table of a press machine, and a lower rubber 2 is disposed on the table 1. A plurality of green sheets 4 as plates are placed on the lower rubber 2 with a lower mylar sheet 3 interposed therebetween, and an upper mylar sheet 5 is placed on top of this green sheet 4. The upper rubber 6 is placed thereon. When the pressing body 7 of the press machine is lowered to join each green sheet 4 to each other, this pressing body 7 presses the green sheet 4 via the upper rubber 6 and the upper Mylar sheet 5, and the space between each green sheet 4 is lowered. The green sheets 4 are joined to each other by an adhesive interposed in the green sheets.

C1 Problems to be Solved by the Invention However, such a conventional oxygen sensor plate stacking device has the following problems: 1) First, there is no intervening material between each green sheet 4. Since the applied adhesive is in a semi-liquid state and there is nothing to support the outer periphery of the green sheets 4, the position of each green sheet 4 is unstable. Therefore, when the pressing body 7 pressurized the green sheet 4 via the upper rubber 6 and the upper mylar sheet 5, there was a problem in that the green sheet 4 shifted laterally as shown in FIG. .

2) Furthermore, since the pressing body 7 directly contacts and pressurizes the upper rubber 6, which is an elastic body, the green sheet 4 may be damaged due to irregularities on the lower surface of the pressing body 7 or foreign matter such as dust attached to the lower surface of the pressing body 7. is not applied uniformly over the entire surface. Therefore, there was a problem in that the green sheet 4 peeled off as shown in FIG.

An object of the present invention is to provide a plate stacking device for an oxygen sensor that can uniformly press and bond stacked plates without shifting in the lateral direction.

The present invention will be explained with reference to FIGS. 1 and 2 showing an embodiment of the present invention.Means for Solving the Problems No.90 It is applied to a device for crimping by means 7.

The frame body 17 has an opening 18 that conforms to the external shape of the plate body 4 and accommodates the plate bodies 4 in a stacked manner in this opening 18 to prevent the plates from shifting laterally. The plate-like elastic bodies 2 and 6 are provided, and the flat plate pressing jigs 15 and 16 are provided on both the front and back sides of the elastic bodies 2 and 6 and transmit the pressing force from the press means 7 to the plate body 4. According to
The above objectives are achieved.

Further, in the plate laminating apparatus of claim 2, FIGS.
As shown in the figure, a positioning pin 31 is provided protruding from at least one of the flat plate pressing jigs 15 and 16, and holes 32 are provided in the plate body 4 and the flat elastic bodies 2 and 6 through which the positioning pin 31 passes.
, 33.36 are drilled.

E9 Effect Since the stacked plates 4 are housed in the opening 18 of the frame 17, they will not shift laterally during pressing.

Further, since the pressing is performed via the flat pressing jigs 15 and 16, the pressing is performed uniformly. As a result, the yield when manufacturing this type of stacked oxygen sensor is improved.

When the positioning pin 31 is used as in claim 2.

Not only the plate body 4 but also the elastic bodies 2 and 6 and the pressing jig 15°16 are reliably positioned.

In the above-mentioned Sections and Sections E which describe the present invention in detail, figures of Examples are used to make the present invention easier to understand, but the present invention is not limited to the Examples.

F. Embodiments Hereinafter, embodiments of the present invention will be described based on the drawings. Note that the same components as those in the prior art are given the same reference numerals, and the explanation thereof will be omitted.

1 and 2 are diagrams showing a first embodiment of the present invention. In the figure, reference numeral 15 denotes a flat lower pressing jig, and this lower pressing jig 15 is disposed approximately at the center of the table 1. A lower rubber 2 having a flat surface having the same dimensions as the lower pressing jig 15 is placed on the upper surface of the lower pressing jig 15 . At the center of the upper surface of the lower rubber 2, a plurality of (for example, four) green sheets 4 made of an oxygen ion conductive solid electrolyte are laminated.

A semi-liquid adhesive is applied in advance between each green sheet 4 in a previous step. This stack of green sheets 4 is accommodated in a rectangular opening 18 of a frame 17, which will be described later, to prevent it from shifting laterally.

An upper rubber 6 (flat elastic body) having the same dimensions as the lower rubber 2 is placed above the green sheet 4. A lower Mylar sheet 3 and an upper Mylar sheet 5 are interposed between the lower rubber 3 and the green sheet 4 and between the upper rubber 6 and the green sheet 4, respectively, to protect the surface of the green sheet 4. There is. The lower Mylar sheet 3 and the upper Mylar sheet 5 have the same dimensions as the green sheet 4 in a plane. Further, on the upper surface of the upper rubber 6, an upper pressing jig 16 having the same dimensions as the lower pressing jig 15 is placed.

Reference numeral 17 is the above-mentioned frame body having the opening 18 located between the upper rubber 6 and the lower rubber 2, and the thickness of this frame 17 is slightly smaller than the thickness of the laminated green sheets 4 (for example, 0.1-0.2 Kaku) Thin. A rectangular checkpoint 18 is formed in the center of the frame 17, which is smaller in plane than the lower rubber 2 and upper rubber 6 and has the same dimensions as the green sheet 4 in plane. Vertical wall 19,
20° rectangular opening 18 surrounded by 21 and 22
A green sheet 4 is housed in the , and each peripheral edge 23 , 24 , 25 and 26 of the green sheet 4 is connected to a vertical wall 19 .
, 20, 21 and 22, the lateral position of each green sheet 4 is regulated.

Next, the operation of this embodiment will be explained.

First, the pressing body 7 descends and presses the green sheet 4 through the upper pressing jig 16°, the upper rubber 6, and the upper mylar sheet 5. At this time, since semi-liquid adhesive is present between each green sheet 4, each green sheet 4 is in an unstable state in the lateral direction. However, the four peripheral edges 23, 24, 25 and 26 of the green sheet 4
are in contact with the vertical walls 19, 20, 21, and 22 of the rectangular opening 18, respectively, so that the green sheets 4 do not shift from each other in the lateral direction.Furthermore, the pressing body 7 directly contacts the upper rubber 6. Since the contact is made through the upper pressing jig 16 with a smooth surface without causing any damage, even if the lower surface of the pressing body 7 is uneven or has foreign matter such as dust attached to it, the upper The pressing jig 16 presses the green sheet 4 through the upper rubber 6 and the upper Mylar sheet 5.
Apply pressure evenly. Moreover, the thickness of the frame body 17 is slightly thinner than the laminated green sheets 4, and the upper rubber 6
, lower rubber 2. Since the upper pressing jig 16 and the lower pressing jig 15 are larger than the green sheet 4 in plan, they can press the green sheet 4 over its entire surface. As a result, each green sheet 4 is reliably joined and peeling of each green sheet 4 is prevented.

FIGS. 3 and 4 are diagrams showing a second embodiment of the present invention. Note that the same parts as in the first embodiment are denoted by the same reference numerals, and the explanation thereof will be omitted.

In the figure, reference numeral 31 indicates three positioning pins, which are located inside the rectangular opening 18 and project from the upper surface of the lower pressing jig 15. Lower rubber 2. Upper rubber 6, lower mylar sheet 5. The green sheet 4 and the upper pressing jig 16 have holes 32, 33, 34, 3 at positions facing the positioning pins 31, respectively.
5.36 and 37 are formed. Locating pin 3
1 are respectively opposed holes 32, 33.34°35.
36 and 37 are inserted into the opposing holes 32, 33, 34, 35, 36, respectively.
and 37, the upper end of the positioning pin 31 is located slightly below the upper surface of the upper pressing jig 37.

Next, the operation of this second embodiment will be explained.

First, the pressing body 7 is lowered and the upper pressing jig 16. Green sheet 4 via upper rubber 6 and upper mylar sheet 5
Press. At this time, since the upper end of the positioning pin 31 is located below the upper surface of the upper pressing jig 16, the pressing body 7 will not come into contact with the positioning pin 31 even if the lower rubber 2 and the upper rubber 6 are elastically deformed. Therefore, the upper pressing jig 16 is
The green sheet 4 is evenly and reliably pressed through the grip 5. Furthermore, the positioning bin 31 has holes 32, 33, 3
4, 35, 36 and 37, the lower rubber 2. Lateral displacement of the upper rubber 6, lower mylar sheet 3, and upper mylar sheet 5 is also prevented. Therefore, the green sheet 4 can be pressurized more reliably than in the first embodiment. As a result, the green sheets 4 are joined more reliably, and peeling of the green sheets 4 is also prevented.

G. Detailed Description of the Invention According to the present invention, the lateral position of a plurality of laminated plates made of an oxygen ion conductive solid electrolyte is regulated by the frame, so that the plate Since lateral displacement is prevented and the plates are evenly and reliably joined under pressure, peeling of the plates is prevented, which improves yield. When the positioning bin is provided in a protruding manner as in claim 2, the prevention of lateral displacement becomes even more reliable.

[Brief explanation of drawings]

Figure 1 is a sectional view showing the first embodiment of the present invention, Figure 2'@
is an exploded perspective view thereof. FIG. 3 is a sectional view showing a second embodiment of the invention, and FIG. 4 is an exploded perspective view thereof. FIG. 5 is a cross-sectional view showing a conventional oxygen sensor plate stacking device, and FIGS. 6 and 7 are cross-sectional views illustrating problems with the conventional oxygen sensor plate stacking device. 2.6: Rubber 4: Plate body 15.16: Pressing jig 17: Frame body 18: Rectangular opening 31: Bottle

Claims (1)

[Scope of Claims] 1) An apparatus for compressing a plurality of laminated plates made of an oxygen ion conductive solid electrolyte using a pressing means, the apparatus having an opening conforming to the external shape of the plate, and having an opening in accordance with the external shape of the plate; a frame body that accommodates the plate bodies in a stacked manner and prevents them from shifting laterally; a flat elastic body disposed on both the front and back surfaces of the laminated plate bodies; and the press that is disposed on both the front and back sides of the elastic body. 1. A plate stacking device for an oxygen sensor, comprising: a flat plate pressing jig for transmitting the pressing force of the means to the plate body. 2) In the plate stacking device for an oxygen sensor according to claim 1, a positioning pin is provided protrudingly on at least one of the flat plate pressing jig, and a hole through which the positioning pin passes through the plate body and the flat elastic body. A plate stacking device for an oxygen sensor, characterized in that the plate stacking device is provided with a hole.