GB2023726A

GB2023726A - Resilient-flange connection

Info

Publication number: GB2023726A
Application number: GB7918900A
Authority: GB
Original assignee: Bayerische Motoren Werke AG
Current assignee: Bayerische Motoren Werke AG
Priority date: 1978-06-02
Filing date: 1979-05-31
Publication date: 1980-01-03
Also published as: IT7923021A0; DE2824205A1; GB2023726B; IT1120767B; FR2427482B1; FR2427482A1

Abstract

A flange (3) at the end of an I.C. engine intake pipe (1) is embraced by an elastomeric ring (5) and enclosed by a one-piece clamping ring (6) which clamps the pipe (1) to a cylinder head (2). The ring (6) is large enough to allow it to be slipped over the flange (3) onto the pipe (1) during assembly. <IMAGE>

Description

SPECIFICATION Resilient-flange connection The present invention relates to a resilientflange connection, particularly between an intake pipe system and a multi-cylinder internal combustion engine, having a resilient annular connecting element at each connection point between the inlet ducts in the cylinder head and the pipes of the intake pipe system, which connecting elements comprise resilient flange elements for connections between each face of a flange of the cylinder head and an intake pipe.

A connection constructed in this manner is described in German Patent Application No. P 27 44 039.7.

An aim of the invention is to improve such a connection, particularly in such a way that it can be used without any additional machining of, or alteration to, existing cylinder heads.

With this aim in view, the end of each intake pipe in a connection according to the present invention has an annular collar in the form of a flange, each collar is embraced axially and radially in relation to the pipe by a ring of elastomeric material which constitutes the connecting element, and each ring and each collar are enclosed by a one-piece flange ring which clamps the end of the intake pipe concerned tightly to the face of the flange of the cylinder head, by means of the ring and the collar of the pipe, which one-piece flange ring, for the purpose of assembly, has an internal contour greater than the external contour of the collar so as to provide a slight clearance to allow the flange ring to be slipped or pushed onto the end of the pipe.

For the purpose of securing the intake pipe system to the cylinder head, all that one needs to do for such a connection is firstly to slip or push each one-piece flange ring on to the end of each intake pipe and to clip a ring of elastomeric material on to the collar of each intake pipe. The intake pipe system can then be secured to the smooth flange-face of the cylinder head.

German Offenlegungschrift 20 50 619 explains how to secure a carburettor in a resilient manner to an intake pipe system with the aid of a flanged fixing means, a rubber ring of substantially U-shaped cross-section being forced over a flange on the neck of the carburetter, which flange is embedded over as much as approximately half its depth in a recess in a flange of the intake pipe, and a two-part flange ring of sheet metal presses the rubber ring against the flange of the intake pipe by means of a screw connection with the flange of the intake pipe. This construction not only requires a divided flange ring, but also a complementary recess in the face of the intake pipe flange. Furthermore, a further seal is required between the flange on the neck of the carburettor and the intake pipe flange.

A connection according to the present invention is preferably made with a smooth seal being formed integrally with each ring, which seal extends betweennthe face of the flange of the cylinder head and the end face of the intake pipe. This avoids the use of a separate element for effecting a seal between the intake pipe and the cylinder head.

A particularly simple and readily manufactured form of the ring with the seal may result if the collar at the end of each intake pipe is an end flange, a face of which is flush with the end face of the intake pipe, the faces of the flange of the cylinder head are disposed in a common plane, the outer bearing faces of the flange rings lie directly against the face of the flange of the cylinder head, and the smooth seal extends between the remaining portion of the face of the flange of the cylinder head and the end face of each intake pipe, including the face of the collar which is flush therewith.

Advantageously, the flange rings, together with apertured wings thereon, are formed as pressure castings free from undercut. The flange rings can then readily be produced by casting or pressure-casting.

An example of a connection in accordance with the present invention is illustrated in the accompanying drawing, in which:~ Figure 1 is an axial sectional view of the connection, between an intake pipe system and a cylinder head of a multi-cylinder internal combustion engine; Figure 2 is a section along line Il-Il of Fig.

1; and Figure 3 is an end view of parts of the connection along the line Ill-Ill of Fig. 1.

An intake pipe arrangement is shown in Figs. 1 to 3 comprising individual pipes secured to the cylinder head 2 of a multicylinder internal combustion engine by means of resilient flange connections. A flange or annular collar 3 is provided at the end 4 of each intake pipe 1. A precompressed ring 5 of elastomeric material is clipped over the collar 3. A flange ring 6, screwed to the cylinder head 2, clamps the collar 3, and with it the intake pipe 1, to a flange face 7 of the cylinder head 2 through the intermediary of the ring 5.

A face of the collar 3 at the end of each intake pipe 1 is flush with end face 8 of the intake pipe 1. The ring 5 of elastomeric material, clipped over the collar 3, embraces this collar axially and radially in relation to the pipe and extends beyond the collar 3 so that it bears against the outer wall of the intake pipe 1 and also the end face 8 thereof. At the end face 8 it extends inwardly between the end faces 8 and 2 as far as the bore of the intake pipe, and so forms a smooth seal 9. In a region remote from the seal 9, the ring 5 has a face 10 inclined at an angle of approxi mately 45 to the pipe axis.

The flange ring 6 surrounds the ring 5 of elastomeric material radially substantially completely. The inner contour of the flange ring 6 matches the outer contour of the ring 5 and has an inclined face 11 which bears against the inclined face 10 of the ring 5. The smallest inside diameter of the flange ring 6, at a region 12, is slightly greater than the outer diameter of the collar 3. This allows the flange ring 6 to be pushed or slipped with a slight clearance over the collar 3 and on to the intake pipe 1 before the ring 5 of elastomeric material is clipped on to the collar 3.

Each flange ring 6 has apertured wings 13 which are free from undercut and which are formed integrally with the flange rings, so that they can be produced by pressure-casting.

The apertured wings 13 have bearing faces 14 which, when the system is assembled, lie against the flange face 7 of the cylinder head 2 and thus prevent excessive compression of the ring 5.

In assembly of the system, first a flange ring 6 is slipped or pushed over the collar 3 at the end 4 of each intake pipe 1. A ring 5 of elastomeric material is clipped on to each collar 3, and then, after all the intake pipes 1 have been prepared in the same manner, the intake pipe system is secured to the face 7 of the flange of the cylinder head 2. Except for narrow gaps at both sides of the face 7, the flange rings 6 fully enclose the rings 5 of elastomeric material and hold the ends 4 of the intake pipes 5, and therefore the intake pipe system, against the cylinder head 2 in a resilient manner.

Claims

1. A resilient-flange connection, particularly between an intake pipe system and a multi-cylinder internal combustion engine, having a resilient annular connecting element at each connection point between the inlet ducts in the cylinder head and the pipes of the intake pipe system, which connecting elements comprise resilient flange elements for connections between each face of a flange of the cylinder head and an intake pipe, in which the end of each intake pipe has an annular collar in the form of a flange, each collar is embraced axially and radially in relation to the pipe by a ring of elastomeric material which constitutes the connecting element, and each ring and each collar are enclosed by a one-piece flange ring which clamps the end of the intake pipe concerned tightly to the face of the flange of the cylinder head, by means of the ring and the collar of the pipe, which one-piece flange ring, for the purpose of assembly, has an internal contour greater than the external contour of the collar so as to provide a slight clearance to allow the flange ring to be slipped or pushed onto the end of the pipe.

2. A connection according to claim 1, wherein a smooth seal is formed integrally with each ring, which seal extends between the face of the flange of the cylinder head and the end face of the intake pipe.

3. A connection arrangement according to claim 2, wherein the collar at the end of each intake pipe is an end flange, a face of which is flush with the end face of the intake pipe, the faces of the flange of the cylinder head are disposed in a common plane, the outer bearing faces of the flange rings lie directly against the face of the flange of the cylinder head, and the smooth seal extends between the remaining portion of the face of the flange of the cylinder head and the end face of each intake pipe, including the face of the collar which is flush therewith.

4. A connection according to any one of claims 1 to 3, wherein the flange rings together with apertured wings thereon are formed as pressure-castings free from undercut.

5. A resilient-flange connection substantially as described herein with reference to the accompanying drawing.