Abstract: A closure element serves for closing off bores which are subjected to internal pressure, preferably bores in engine or valve blocks or tanks. Said closure element has a sleeve-shaped main body which can be inserted into the bore and the outer circumference of which, in the installed state, bears sealingly against the inner surface (2) of the bore (3). Provided are the main body and an expanding body (4) which is connected to said main body by a bent-over transition region (8). The closure element is firstly inserted into the bore (3) and subsequently pressed into the latter by the application of pressure to the expanding body (4). As the closure element is pressed into the bore (3), the expanding body (4) is pushed into the main body (1) by deformation, so as to push the main body (1) in the radial direction against the inner surface (2) of the bore (3). In this way, said closure element can withstand even relatively high internal pressures and can be produced in a simple manner.

Abstract: Closing element for sealing holes subjected to internal pressure includes a hollow cylindrical main body insertable into the hole substantially without play, and a hat-like spreading element pressable into the main body. The spreading element applies radial pressure to the inner wall of the main body in the installed state, wherein the main body is spread and pressed against the wall of the hole. The main body has a closing bottom having a circumferential radial ring surface and a slightly conical cone surface connected thereto. During operation, the closing bottom is pressed against the end face of the spreading element by the internal pressure and is bent over inner and outer edges of the end face and deformed so as to expand radially. This results in strengthened anchoring of the closure in the material of the component, and self-reinforcement of the press-out force required to remove the closure.

Abstract: The invention relates to a closing element for sealing holes subjected to internal pressure, comprising a hollow cylindrical main body (3) that can be inserted into the hole substantially without play, and a hat-like spreading element (8) that can be pressed into the main body, wherein said spreading element applies radial pressure to the inner wall of the main body (3) in the installed state, wherein the main body is spread and pressed against the wall of the hole to be closed. The main body (3) has a closing bottom (5), which has a circumferential radial ring surface (6) and a slightly conical cone surface (7) connected thereto, wherein during operation the closing bottom is pressed against the end face (12) of the spreading element (8) by the internal pressure and is bent over the inner and outer edge of the end face and deformed so as to expand radially.

Abstract: The closure element according to the invention is a tensioning pin (1) which can be tensioned and the head part of which forms a closure disc (2) that can be spread apart by the tensioning pin. Said closure disc is pressed, in the installed state, against the inner wall (6) of the bore to be closed. When a specific tensile stress is reached, the tensioning pin (1) is separated from the closure disc (2) at a predetermined breaking point (7) of the tensioning pin. The easy-to-handle tensioning pin facilitates the installation of the closure in the bore in the component. Since the closure disc (2) is pressed against an outer counterholder (9) during the installation process, it can be inserted into a continuously smooth bore. The limitation of the tensile stress effected by way of the predetermined breaking point also ensures that the bore is closed with a defined closing force.