Lid

Abstract

Sealing cap (1) for a bore (B) which has an inner diameter (D B ) wherein the closure lid (1) is cup-shaped and has a bottom wall (1b) and a side wall (1s) formed thereon, wherein the side wall (1s) has a lower circumferential region (1su) and an upper circumferential region (1so), wherein a transition region (1sü) is arranged between the two regions (1su, 1so), and wherein the outer diameter (D2) of the upper end (OE) of the lower region (1su) adjacent to the transition region (1sü) is smaller than the outer diameter (D1) of the lower end (UE) of the upper region (1so) adjacent to the transition region (1sü), wherein the outer diameter (D1) of the lower end (UE) of the upper region (1so) adjacent to the transition region (1sü) is larger than the inner diameter (D B) of the bore (B) is characterized in that the upper area (1so) is designed in such a way that the closure cover (1) can be fully received into the bore (B).

Description

[0001] The present invention relates to a closure cap for a bore having an inner diameter, wherein the closure cap is cup-shaped and has a bottom wall and a side wall formed thereon.

[0002] A generic closure cap 1 is already known from DIN 443 and in the Fig. 1 and Fig. 1a in its original form, in which it has not yet been clamped into the bore B. It has an outwardly curved base wall 1b and a slightly conical side wall 1s formed thereon. The closure cover 1 is produced by deep drawing a sheet metal. The base wall 1b is bent upwards at its outer edge 3 and merges seamlessly into the side wall 1s, which can be conical (angle φ) or cylindrical. The closure cover known from DIN 443 is usually gripped with a suction gripper 10, 11, which engages with the interior I of the closure cover 1 with its tip 13. The suction gripper 10 has a central channel 11, in which a negative pressure can be generated as soon as the tip 13 of the suction gripper 10 rests against the inside I of the base wall 1b. Due to the curved outer shape of the base wall 1b, the closure lid 1 cannot be completely flat and may therefore be damaged.rest crookedly on a support surface. This must also be taken into account when dimensioning the diameter of the tip 13 of the suction cup 10, which is always inserted vertically from above into the interior of the pot. So that the suction cup can easily engage even crookedly positioned closure lids, the outer diameter of the suction cup 10 must be smaller than the inner diameter 1i of the closure lid 1. Due to the spherical tip 13 of the suction cup 10 and the possible crooked position of the closure lid 1, the closure lid can initially be lifted crookedly by means of the suction cup 10 and accordingly inserted crookedly into the bore. After placing it on the chamfer B. fthe bore B, the closure cover 1 is usually not completely centered relative to the suction gripper 10 when it is further pressed into the bore B, which leads to an oblique fit of the closure cover 1 in the bore B when it is further pressed into the bore B. The sealing compound 16 introduced into the bore B before the closure cover 1 is inserted does not adhere sufficiently to certain areas of the cover when it is in an oblique position, which can lead to leaks.

[0003] Furthermore, DE 101 46 148 A1 discloses a closure cap for inserting into and closing bores, particularly assembly bores in gearbox or engine housings. The closure cap is cup-shaped and, in addition to a cover base and a cylindrical side wall, has a radially outwardly projecting collar. When inserted into the bore, the collar rests on the workpiece surface surrounding the bore.

[0004] The object of the present invention is to provide a closure cap which guarantees a secure closure of the bore.

[0005] This object is achieved according to the invention with a closure cap in which the side wall has a lower circumferential region and an upper circumferential region, wherein a transition region is arranged between the two regions, and in that the outer diameter of the upper end of the lower region adjacent to the transition region is smaller than the outer diameter of the lower end of the upper region adjacent to the transition region, wherein the outer diameter of the lower end of the upper region adjacent to the transition region is larger than the inner diameter of the bore, and wherein the upper region is designed such that the closure cap can be completely received in the bore.

[0006] The invention is based on the idea that the closure cap must first be centered and aligned parallel to the drill opening before being pressed into the bore so that it can then be inserted straight into the bore. Centering and parallel alignment before insertion ensures that the sealing compound can be distributed evenly around the closure cap. For this purpose, the side wall of the closure cap has a lower circumferential area whose maximum outer diameter is smaller than the inner diameter of the bore. Above this lower circumferential area there is a transition area that connects the lower area with the upper circumferential area. In the transition area the outer diameter increases continuously and / or abruptly so that at the upper end of the transition area the outer diameter of the side wall is larger than the inner diameter of the bore.The transition area thus forms a bearing surface with which the closure cap rests on the edge of the bore opening. Because the closure cap has an outer diameter from the base wall to the lower edge of the transition area that is smaller than the inner diameter of the bore, the closure cap can be inserted into the bore without great effort. It then rests on the edge of the bore opening with the transition area and is centered relative to the bore by the lower area and aligned parallel to the edge of the bore opening by the bearing surface of the transition area. The closure cap can then be correctly aligned to the bore and pressed into the bore in a centered manner, whereby the sealing compound is then advantageously distributed evenly around the closure cap.The transition area pressed into the bore and the lower area, together with the inner wall of the bore, advantageously form a space in which additional sealing compound can accumulate, which contributes to good sealing.

[0007] As already explained, the transition area forms a bearing surface on the bore edge. This bearing surface can be conical, round, or collar-shaped. The outer diameter of the side wall advantageously increases in the transition area by 0.01 to 0.2 mm, preferably by 0.04 to 0.1 mm, and particularly preferably by 0.07 to 0.09 mm, so that at the upper edge of the transition area it is larger than the inner diameter of the bore.

[0008] Since the closure lid is preferably a deep-drawn part, the bottom wall is connected to the lower region of the side wall via a connecting region which is curved or bent.

[0009] The outer wall or the entire side wall formed by the upper section is preferably conical. However, it can also be cylindrical. It is only necessary to ensure that a sufficient frictional force is maintained between the inner wall of the bore and the cover cap after pressing in to hold the cover cap securely in the bore.

[0010] The axial length of the upper region can be selected to be 1.5 to 3 times, preferably 2 to 2.8 times, greater than the sum of the axial lengths of the lower and transition regions. In particular, if the outer wall of the upper region is conical, with the outer diameter increasing from the transition region to the upper edge of the upper region or the edge of the closure cap, a good seal and high friction force can be achieved after the closure cap is pressed into the bore.

[0011] The outer wall or the entire side wall formed by the lower area is advantageously conical or cylindrical.

[0012] As already explained, the closure lid is advantageously manufactured as a deep-drawn part from sheet metal. The deep-drawing tool can be designed accordingly to form the outer contour of the transition area and the lower and upper areas. However, it is also possible to first produce a closure lid by deep-drawing, the outer side of which has either a conical or cylindrical section, or both conical and cylindrical sections. The outer wall can then be machined by grinding or milling to achieve the contour described above.

[0013] Advantageously, the support surface of the closure lid formed by the bottom wall is flat, so that the closure lid is always aligned in the same position relative to the gripping tool before being picked up by means of a gripping tool.

[0014] It is also advantageous if the inside of the base wall is also flat so that the gripping tool can only pick up the closure cover in one orientation to the gripping tool.

[0015] A possible embodiment of the closure cap according to the invention is explained in more detail below with reference to drawings.

[0016] They show: Fig. 1: Cover according to DIN 443; Fig. 1a: Insertion process of the closure cap according to Fig. 1 by means of a suction gripper; Fig. 2: closure cap according to the invention; Fig. 3: Enlarged detail of the cover according to Fig. 2; Fig. 4a-c: Inserting and centering the cover into the hole; Fig. 5a: Pressed-in closure cap according to the invention; Fig. 5b: Enlarged section of the closure cover in the transition area.

[0017] The Fig. Figure 2 shows a possible embodiment of the closure lid 1 according to the invention, which has a bottom wall 1b and a side wall 1s formed thereon, which are connected to one another by the curved connecting regions 3. The outer side of the bottom wall 1b forms a flat support surface A. Due to the flat design with a constant thickness of the bottom wall 1s, its inner side I is also flat, so that the closure lid 1 can always be picked up in the same position by means of a suction gripper (not shown).

[0018] The side wall is divided into three superimposed areas, with the lower area 1su adjoining the connecting area 3 above. Adjacent to the upper edge OE of the lower area 1su is the transition area 1sü, to whose upper edge the upper area 1so adjoins.

[0019] The Fig. Figure 3 shows an enlarged detail of the transition area 1sü of the closure lid. The outer diameter D2 of the upper edge OE of the lower area 1su of the side wall 1s of the closure lid 1 is less than or equal to the inner diameter D B the bore B. The outer diameter D1 of the lower edge UE of the upper area 1so of the side wall 1s of the closure cover 1 is larger than the inner diameter D B of the bore B, so that the transition area 1sü forms a support surface for resting on the edge of the bore B. The height H u of the lower area 1su plus the height Hü is less than the height Ho of the upper range 1so. The ratio of H o / (H u + H ü ) can be 1 to 3, preferably 2.5. The heights H o and H u can also be referred to as axial lengths of the areas 1su, 1so, since the closure cover 1 is rotationally symmetrical. The height H ü of the transition area is compared to the heights H o and H u significantly smaller, in particular by a factor of 2 to 5 smaller than the height H u .

[0020] The thickness of the side wall 1s can be different in the individual areas 1su, 1sü, 1so.

[0021] In Fig. 4a shows the insertion of the closure cap 1 into the bore B by means of a suction gripper 10. Since the outer diameter D 10of the suction gripper 10 must be smaller than the inner diameter D1i of the side wall 1s, the closure cover 1 to be used is usually not held centrally to the suction gripper 10. Unlike the Fig. 1, the tip 13 of the suction gripper 10 is flat and not round, since the inner side I of the bottom wall 1s of the closure cover 1 is also flat. This ensures that the axis Ba of the bore B is always parallel to the axis 1a of the closure cover when the latter is inserted into the bore B. However, since the closure cover 1 is usually not aligned centrally to the suction gripper 10 and thus also not aligned centrally to the bore B, the closure cover 1 is usually initially positioned with its lower edge 3 on the bevel B fthe hole B and is centered relative to the hole B during further insertion using the suction gripper in the direction of the arrow until it rests with its lower side wall area 1su in the hole B and, as shown in Fig. 4b, with the outer wall of the transition area 1sü on the lower part of the chamfer B f If the rotational axis 1a of the closure cover 1 was not yet aligned parallel to the bore axis Ba, its axis 1a will now be aligned parallel to the bore axis Ba, since the transition area is rotationally symmetrical. After centering, the axis 1a is congruent with the bore axis Ba.

[0022] The Fig. Figure 4c shows an enlarged section of the transition area 1sü with the adjacent areas and the bore wall. Due to its conical shape, the lower area 1su, together with the transition area 1sü and the bore inner wall, forms a gap SP, which is filled by the sealing compound 16 upon further pressing of the closure cover 1 into the bore B, as shown in the Fig. 5a and Fig. 5b. The sealing compound 16 is thus distributed around the side wall 1s in the area of ​​the lower region 1su and the transition region 1sü. Depending on the gap width or the choice of the cone angle φ k more or less sealing compound 16 will be present in the gap SP.

[0023] As already explained, the outer wall of the lower section can be conical, as shown in the figures. However, it is also possible for the outer wall to be cylindrical.

[0024] The Fig.6 shows an embodiment in which the transition region 1sü is formed by two sections 1sü1 and 1sü2 which are arranged one above the other, the outer surfaces 1ü1 and 1ü2 - as shown - having a curvature in cross-section predetermined by the respective radii R1, R2. The radius R2 of the upper section 1sü2 is smaller than the radius R1 of the lower section 1su1. The outer surface of the lower region 1su is preferably conical, and this surface is inclined by approximately 1° to 3° to the outer surface of the upper region 1so. The surface of the upper region 1so is preferably conical, i.e. arranged at the angle φ, with φ > 90°, to the flat, planar bottom wall 1b. The inner wall 1si of the side wall 1s is smooth and inclined by the angle φ to the bottom wall 1b.

Claims

[1] Cover (1) for a bore (B) which has an inner diameter (D B ), wherein the closure lid (1) is pot-shaped and has a bottom wall (1b) and a side wall (1s) formed thereon, wherein the side wall (1s) has a lower circumferential region (1su) and an upper circumferential region (1so), wherein a transition region (1sü) is arranged between the two regions (1su, 1so), and that the outer diameter (D2) of the upper end (OE) of the lower region (1su) adjacent to the transition region (1sü) is smaller than the outer diameter (D1) of the lower end (UE) of the upper region (1so) adjacent to the transition region (1sü), wherein the outer diameter (D1) of the lower end (UE) of the upper region (1so) adjacent to the transition region (1sü) is larger than the inner diameter (D B ) of the bore (B), characterized bythat the upper region (1so) is designed in such a way that the closure cover (1) can be completely received in the bore (B). [2] Closure cap (1) according to claim 1, characterized by that the outer diameter (D2) of the upper end (OE) of the lower region (1su) adjacent to the transition region (1sü) is less than or equal to the inner diameter (D B ) of the bore. [3] Closure lid (1) according to claim 1 or 2, characterized by that the maximum outer diameter of the lower area is smaller than the inner diameter (D B ) of the hole (B). [4] Closure lid (1) according to one of the preceding claims, characterized by that the transition area (1sü) forms a collar-shaped support surface with which the closure cover (1) rests on the bore edge (B k ) can be brought to bear. [5] Closure lid (1) according to one of the preceding claims, characterized bythat the outer diameter (D) in the transition area (1sü) increases continuously and / or abruptly in sections starting from the upper end (OE) of the lower area (1su) towards the upper area (1so). [6] Closure lid (1) according to one of the preceding claims, characterized by that the outer diameter (D1) is 0.05 to 0.2 mm, preferably 0.06 to 0.1 mm, particularly preferably 0.07 to 0.09 mm larger than the outer diameter (D2). [7] Closure lid (1) according to one of the preceding claims, characterized by that a connecting region (3) connects the bottom wall (1b) with the lower region (1su) of the side wall (1s). [8] Closure lid (1) according to one of the preceding claims, characterized by that the outer wall (1soa) of the upper region (1so) is conical or cylindrical and / or that the outer wall (1sua) of the lower region (1su) is conical or cylindrical. [9] Closure lid (1) according to one of the preceding claims, characterized by that the inner wall (1si) of the side wall (1s) is conical. [10] Closure lid (1) according to one of the preceding claims, characterized by that the transition region (1sü) is formed by at least two regions (1sü1, 1sü2) arranged axially one above the other, wherein the outer surfaces (1ü1, 1ü2) of these regions (1sü1, 1sü2) or the entire region of the side wall forming the transition region (1sü) is conical, curved, bent or round in longitudinal cross-section. [11] Closure cap (1) according to one of the preceding claims, characterized by that the axial length (H o ) of the upper region (1so) is 1.5 to 3 times, preferably 2 to 2.8 times, greater than the sum of the axial lengths (H U , H Ü ) of the lower area (1su) and the transition area (1sü). [12] Closure cap (1) according to one of the preceding claims, characterized by that the closure lid (1) is a deep-drawn part. [13] Closure cap (1) according to one of the preceding claims, characterized by that the bottom wall (1b) forms with its outer side a support surface (A) which is flat. [14] Closure cap (1) according to claim 13, characterized by that at least the area of the bottom wall (1b) forming the support surface (A) is flat. [15] Closure cap (1) according to claim 13 or 14, characterized by that the inside (I) of the bottom wall (1b) is flat. [16] Method for producing a closure cap (1) according to one of the preceding claims, characterized by that the closure cover (1) is made from sheet metal by deep drawing. [17] Method according to claim 16, characterized bythat at least the outer side of the transition region (1sü) and / or the lower region (1su) is machined by means of a material-removing process for incorporating the outer diameter profile.

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