DE29804497U1 - Shock absorber tapping device - Google Patents

Description

My file: F 47/8 rö

Shock absorber drilling machine

The invention relates to a shock absorber drilling device with a drill that creates an opening in the wall of the shock absorber for emptying the shock absorber fluid.

Such a shock absorber drilling device is known, for example, from DE 41 13 460 Cl, but it is forceful and cumbersome to handle, as the operator has to apply the feed force for the drill by hand and also has to hold the drilling device until the shock absorber is emptied.

The object of the invention is to provide a simple alternative to the prior art with extremely easy handling for deoiling shock absorbers when installed in the vehicle.

This problem is solved by the characterizing features of claim 1.

The subsequent subclaims contain design features which represent advantageous and beneficial further developments in the solution of the task.

The shock absorber drilling device according to the invention is designed in the form of a collet and the drill is used for the feed and

The drilling rotation is actuated by compressed air so that the operator does not have to exert any force to drill into the shock absorber.

Furthermore, thanks to the collet, it is possible to create a hole in the shock absorber housing while the shock absorber is installed. . .

To deoil the shock absorber, only one hole needs to be drilled and the pressure in the shock absorber causes some of the oil to flow out immediately after the hole is made and the remaining oil is then flushed out by the compressed air, creating excess pressure in the shock absorber housing, so that the oil is completely flushed out of the shock absorber in several deoiling phases and flows out through an oil outlet via the jaw that holds the drill and shows the air connections. This drilling device can be set up for different shock absorber diameters due to its design as a collet with an adjustable jaw and remains attached to the shock absorber during the entire deoiling process.

This device creates a pressure cushion on the oil in the shock absorber, which serves as a propellant for the deoiling process.

The drilling device can be used for disposal of both oil-pressure shock absorbers and high-pressure gas shock absorbers.

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The drawing shows an embodiment of the invention, which is explained in more detail below. The only figure shows a top view in partial section of a pliers-like drilling device clamped around a shock absorber. ■

The shock absorber drilling device for draining the liquid (oil) from a shock absorber has a collet (Z) that clamps around the shock absorber (S) and is adjustable in the clamping jaw. In the collet's adjustable jaw (1) a drill (2) is mounted that can be driven by compressed air in the feed and drilling movement, with which an opening (3) is created in the wall (Sl) of the shock absorber (S). The jaw (1) has a liquid drain (4) that exits from the jaw (1) from the drill (2).

The drill (2) is replaceably held in a piston (5) that can be pressurized with compressed air and is secured in the piston (5) by a threaded pin (6).

The piston (5) has a piston rod (7) that runs coaxially to the drill (2) and is driven (axially rotated) with the drill (2) inserted via its piston rod (7) by a pneumatic screwdriver (not shown) connected to it. ■

The drill (2) is mounted in a drill bushing (9) that is sealed into the jaw (1) and protrudes from the jaw (1) and rests against the wall (Sl) with seals (8) and can be moved axially and rotated.

The piston (5) with its integral piston rod (7) is axially mounted with seals (10) in a piston chamber (11) of the jaw (1).

mounted so that it can be moved and rotated; in the jaw (1) lies

on both sides of the piston (5) into the piston chamber (11) laterally

inlet compressed air supply (12, 13), preferably holes with

Screw thread for connecting compressed air hoses or a compressed air component.

The drill channel (14) in the drill bushing (9) and a chamber (15) adjoining it in the drill bushing (9) are connected to the oil outlet (4) for the shock absorber fluid, which extends laterally from it in the jaw (1); the piston chamber (11) is directly connected to the chamber (15), so that a connection is provided between the chamber (15) and the piston chamber (11) for an oil and compressed air flow.

In the chamber (15), a replaceable dirt trap screen (18) is arranged around the drill (2), which is supported at one end in the drill bushing (9) and at the other end on a support in the chamber (15) in front of the piston chamber (11) and thus in front of the stroke of the piston (5).

By removing the drill bushing (9), the dirty sieve (18) can be removed from the chamber (15), cleaned or replaced with a new sieve (18).

The resulting drilling chips are collected in the sieve (18) and the perforated disc (19) prevents the chips from entering the piston chamber (11).

The collet (Z) has a hook-like jaw (16) -gripping arm- with which it partially grips the shock absorber (S).

The jaw (1) is attached to this jaw (16) for adjustment to different shock absorber diameters

adjustable and is tightened against the shock absorber (S) via a handle spindle (17).

The compressed air control to the compressed air supplies (12, 13) and the opening and closing of the oil outlet (4) is carried out via control switches and a ball valve (not shown).

To deoil the shock absorber (S), the collet ("Z) is placed around the damper housing (S) in its lower end when the shock absorber is installed and the jaw (1) is tightened as shown in the drawing; the drill bushing (9) now lies firmly and tightly against the damper housing (S).

Now the oil outlet (4) to the oil removal line is opened and the pneumatic screwdriver is switched on and at the same time compressed air is introduced into the piston chamber (11) through the opening (13), which pressurizes the piston (5) and causes the drill (2) to advance. The drill (2) rotating through the pneumatic screwdriver then creates a hole (3) in the shock absorber wall (Sl).

The drilling process is carried out until the drilling noise changes significantly and the drill (2) is pushed into the damper housing (S). Now, due to the internal pressure of the damper, part of the oil can flow through the hole (3), the drilling channel (14) and the chamber (15) to the drain (4), while at the same time, the piston (5) with the drill (2) is pushed back by the oil pressure and the drill (2) moves out of the hole (3) and the drilling channel (14) into the jaw (1). This frees up the drilling channel (14) to the adjoining chamber (15) and the oil can flow out.

In order to completely flush the oil out of the damper housing (S), the outlet (4) is closed off and compressed air is introduced into the piston chamber (11), the chamber (15), the bore channel (14) and the hole (3) in the damper housing (S) through the compressed air connection (12) located in front of the retracted piston (5), in which pressure then builds up. The oil outlet (4) is then opened again and the excess pressure forces more oil out of the shock absorber (S).

These deoiling phases are carried out until the shock absorber (S) is completely deoiled.

Then, with the oil outlet open, the collet (Z) is removed from the shock absorber (S). The bore hole (3) in the shock absorber (S) is closed with a plug to prevent oil from dripping;

Claims (8)

Protection claims 1. Shock absorber drilling device with a drill that creates an opening in the wall of the shock absorber for draining the shock absorber fluid, characterized by a collet (Z) which clamps over the shock absorber (S) and is adjustable in the clamping jaw, in whose adjustable jaw (1) the drill (2) is mounted so as to be driven by compressed air in the feed and drilling movement and which has a fluid outlet (4) emerging from the jaw (1) of the drill (2). 2. Shock absorber drilling device according to claim 1, characterized in that the drill (2) is exchangeably held in a compressed air-loaded piston (5) which is rotatably connected to the drill (2) via a piston rod (7) with a compressed air screwdriver. 3. Shock absorber drilling device according to claim 1 or 2, characterized in that the drill (2) is mounted in an axially displaceable and rotatable manner in a drill bushing (9) which is inserted in a sealed manner into the jaw (1) and protrudes from the jaw (1) and rests with seals (8) on the wall (S1) of the shock absorber (S). . . 4. Shock absorber drilling device according to one of claims 1 to 3, characterized in that the piston (5) with piston rod (7) is mounted in a sealed manner in a piston chamber (11) of the jaw (1) so that it can be axially displaced and rotated, and in the jaw (1) on both sides of the piston (-5) lateral compressed air supplies (12, 13) open into the piston chamber (11). 5. Shock absorber drilling device according to one of claims 1 to 4, characterized in that the drilling channel (14) and a chamber (15) adjoining it in the drilling bushing (9) are connected to the outlet channel (4) for the shock absorber fluid leading off laterally therefrom in the jaw (1) with the piston (5). 6. Shock absorber drilling device according to one of claims 1 to 5, characterized in that the chamber (15) in the drilling bushing (9) is directly connected to the piston chamber (11) in the jaw (1). ' ■ ■ 7. Shock absorber drilling device according to one of claims 1 to 6, characterized in that a dirt trap sieve (18) is arranged in a replaceable manner in the chamber (15) around the drill (2). 8. Shock absorber drilling device according to one of claims 1 to 7, characterized in that the dirt trap screen (18) is supported at one end in the drill bushing (9) and at the other end on a perforated disk (19) located in the chamber (15) in front of the piston chamber (11). .