EP0764481B1 - Device for forming a collared calibrated hole in plastically deformable walls - Google Patents

Description

The invention relates to an apparatus for forming a calibrated hole surrounded by a collar in plastically deformable Walls, which in the preamble of claim 1 explained type (see e.g. JP-A-61074735).

DE-AS 28 02 230 describes a device for forming a hole surrounded by a collar in a metal plate or known in the wall of a metallic tube in which the hole exclusively by means of frictional heat and pressure of a mandrel quickly rotating around its axis becomes.

Such a device is used for the production of so-called Tube plates required for the production of tube heat exchangers to serve.

The known device does not provide any suggestion Production of punches surrounded by a collar with a certain calibrated flow cross-section.

The object of the invention is a device for forming to redesign a hole surrounded by a collar that the manufacture of precisely calibrated throttle bores of a certain flow cross-section with a minimum Manufacturing effort is made possible.

According to the invention, this object is achieved by a Device for forming a calibrated, surrounded by a collar Hole that explained in the preamble of the claim Kind that indicated in the characterizing part of the claim Features.

Fig. 1

einen Teilschnitt durch ein automatisches Getriebe, wo in bestimmten Bereichen Schmiermittelkanäle verlaufen, die mittels Hülseneinsätzen mit genau kalibrierten Drosselöffnungen versehen werden;

Fig. 2

eine Teilansicht einer erfindungsgemäßen Vorrichtung zur Bildung eines von einem Kragen umgebenen Loches und

Fig. 3

einen Teilschnitt durch den Bereich im Kreis III in Fig. 1 wo an Stelle der bisher bekannten Hülse mit Drosselbohrung die erfindungsgemäße Ausbildung einer Drosselbohrung aufgezeigt ist.

The invention is explained in more detail using an embodiment shown in the accompanying drawings. It shows:

Fig. 1

a partial section through an automatic transmission, where lubricant channels run in certain areas, which are provided with precisely calibrated throttle openings by means of sleeve inserts;

Fig. 2

a partial view of an inventive device for forming a hole surrounded by a collar and

Fig. 3

a partial section through the area in the circle III in Fig. 1 where, in place of the previously known sleeve with throttle bore, the inventive design of a throttle bore is shown.

In automatic transmissions of motor vehicles are one Variety of planetary gear sets, multi-plate clutches and brake bands arranged, each with a precisely measured sufficient amount of lubricant must be provided and accordingly in various components of the automatic Gearbox a number of lubricant channels in Form of axial and radial bores provided that Feed lubricant to the different areas. So everyone Area supplied the required amount of lubricant received, these lubricant channels are so far with sleeve inserts have been provided with throttle bores so that the Lubricant flow to the different areas in a more targeted manner Way can be tuned.

The arrangement of these sleeves with throttle bores required an additional manufacturing and assembly effort.

In Fig. 1 is a central partition in a gearbox 1 2 made of aluminum, which e.g. a ballast or Overdrive planetary gear set from a main gearbox of a Simpson planetary gear set. The middle partition 2 forms an axially extending cylindrical Approach 3 on the radial bearing arrangement 4 and one axial bearing arrangement 5 a clutch component 6 for a multi-plate clutch 7 and a brake band 8 is arranged.

An input shaft 10 coming from the series planetary gear set is connected to a central support 11, which is connected via a radial Wall 12 has axially extending cylindrical lugs 13 and 14, which with the multi-plate clutch 7 and one another multi-plate clutch 15 cooperate.

In the middle partition 2 are axially extending Lubricant bores 16 and 17 arranged over radial Channels 18 and 19 guide lubricant to the bearing assemblies or via further channels 20 to other areas of the transmission hand off.

As can be seen from the circle III in Fig. 1, certain were Inlet ends of the lubricant channels 16 sleeves 21 with throttle bores 22 used to achieve the desired distribution of the lubricant inside the gearbox.

The manufacture of such sheet metal sleeves 21 is also incorporated Throttle bores 22 required additional manufacturing and assembly effort.

From Fig. 2 is an inventive device for forming a hole surrounded by a collar in a plastic deformable wall shown, which consists essentially of a Calibration mandrel 25, which has a conical undercut Displacement collar 26 and a cylindrical calibration shaft 27 has.

3 shows the use of the calibration mandrel according to the invention 25 visible at the entry point of the Lubricating oil channel 16 is brought to an effect if required, calibrated passage in the manner of a throttle bore to manufacture. The calibration mandrel 25 is thereby axial pressure on the outer surface of the component with the Lubricant channel 16 is placed and the pressure becomes such reinforces that the displacement collar 26 through the material plastic deformation in the direction of that shown in FIG. 3 Displaced arrows, whereby a collar 28 is formed, its inside diameter through the cylindrical part of the calibration shaft 27 of the calibration mandrel 25 is determined. At the Pulling out the calibration mandrel 25 from the wall of the component the cylindrical part of the calibration shaft ensures an exact calibrated dimensioning of the inner diameter of the collar 28 and thus for a precise definition of Flow through this narrow point.

It should be noted that this type of calibration of Throttle bores preferably in materials such as e.g. aluminum can be applied favorably where by plastic deformation is not too high and displacement of the wall material can be.

Claims (1)

1. Device for forming a calibrated hole surrounded by a collar (28) in a plastically deformable wall which is provided with a preformed bore (16) of an intermediate diameter, by means of a mandrel driven into the wall by pressure, characterised in that

   the mandrel is in the form of a calibrating mandrel (25) having a conically undercut displacer collar (26) of diameter greater than that of said bore (16) and having a cylindrical part of a calibrating shaft (27) of diameter smaller than that of said bore (16), wherein on driving the mandrel into the wall the displacer collar (26) displaces the material of the wall towards the calibrating shaft (27).

Images