DE102007057048A1 - Hand tool for demounting hydraulic play compensation element from cylinder head of internal combustion engine, has valve gear with camshaft, where cam of camshaft remains in active connection with intermediate element - Google Patents

Abstract

The hand tool (1) has a valve gear with a camshaft. A cam of the camshaft remains in active connection with an intermediate element, which is supported on one side on a gas exchange valve and the other side on a play-compensation element. A base body (7) with a hook-shaped end (8) is hanged at the camshaft on the side facing the intermediate element. The base body has a threaded hole (9) on the side facing the hook-shaped end. An independent claim is included for a method for demounting a hydraulic play compensation element with a hand tool.

Description

The The invention relates to a hand tool and a method for disassembly a hydraulic clearance compensation element with the hand tool.

For technical environment is for example on the European patent specification EP 1 207 637 B1 directed. In this a valve train for an internal combustion engine is described, in which a camshaft with an intermediate element, a drag lever, is in operative connection. On the one hand, the drag lever is based on a gas exchange valve in the cylinder head and on the other hand on a hydraulic clearance compensation element, which is arranged in the cylinder head. In the generic valve train presses the cam of the camshaft on the drag lever, the gas exchange valve against a spring force of a valve spring in an open position.

has such a hydraulic clearance compensation element a defect on, so to replace the hydraulic lash adjuster, normally the chain drive and the camshaft are disassembled and in the subsequent assembly must Control times are reset.

The For this required working time in case of repair is enormously high and costly.

task the present invention is to show a hand tool with a simple removal, or replacement of a hydraulic clearance compensation element possible from a cylinder head of an internal combustion engine is. Another aspect of the present invention is a Method for disassembling a hydraulic clearance compensation element show from the cylinder head of the engine.

These Tasks become on the one hand by the hand tool with the characteristics from the patent claim 1 and the method steps from the characterizing Part of claim 6 solved.

In Advantageously, with the inventive Hand tools a considerable saving of working time in case of repair or be achieved during a rework on the series assembly line. About that In addition, subsequent errors in the otherwise necessary renewed Control timing is avoided.

The Embodiments according to the claims 2 and 3 allow a centric positional fixation of the tools to the hydraulic valve clearance compensation element.

With Help the printing sleeve according to claim 5, the adjustment for the screw is significantly reduced.

With the method according to claim 6 can in simple, faster and cheaper way a hydraulic clearance compensation element with the aid of the tool according to the invention be dismantled.

in the The following is the invention with reference to a particularly preferred embodiment explained in more detail in three figures.

1 shows a section through a hand tool according to the invention.

2 shows a plan view of a three-dimensional illustrated, inventive hand tool.

3 shows a three-dimensional view of the hand tool according to the invention, as it comes to disassemble a hydraulic lash adjuster used.

in the The following apply to the same components in all three Figures have the same reference numbers.

1 shows a section through a hand tool according to the invention 1 , An elongated body 7 of the hand tool 1 on the one hand has a hook-shaped end 8th on. In that, the hooked end 8th opposite end of the body 7 is a threaded hole 9 arranged in which a screw 10 is screwed. For easier turning of the screw 10 this one has a knurled nut 13 on. One axial direction of the screw 10 is oriented so that it is substantially parallel to an axial direction of a later depressurable gas exchange valve. Will the screw 10 pressed, becomes a pressure sleeve 11 between the screw 10 and the gas exchange valve to be depressurized is displaced in the axial direction. So that a clean linear motion is realized, have the main body 7 and the pressure sleeve 11 a common linear guide 12 on.

2 shows a plan view of a three-dimensional illustrated inventive hand tool 1 , To 2 the same thing already applies under 1 was executed.

• – Einhängen des Grundkörpers 7 mit seinem hakenförmigen Ende 8 an die Nockenwelle 3 auf der dem Zwischenelement zugewandten Seite;
• – Einschrauben der Schraube 10, bis sie auf dem Gaswechselventil 6 und/oder auf dem Ventilteller aufliegt;
• – Weiteres Einschrauben der Schraube 10 und Niederdrücken des Gaswechselventils 6 und/oder des Ventiltellers, bis das Zwischenelement 5 lose ist;
• – Herausnehmen des Zwischenelementes 5 und des Spielausgleichselementes 2

3 shows the three-dimensional view of the tool according to the invention, as it comes to disassemble a hydraulic valve clearance compensation element used. According to the invention, the method steps for disassembly of the hydraulic clearance compensation element 2 with the hand tool 1 , without pressure sleeve 11 as follows:

• - Hanging the body 7 with its hooked end 8th to the camshaft 3 on the side facing the intermediate element;
• - Screw in the screw 10 until it's on the gas exchange valve 6 and / or resting on the valve disk;
• - Further screwing in the screw 10 and depressing the gas exchange valve 6 and / or the valve disk until the intermediate element 5 is loose;
• - Remove the intermediate element 5 and the clearance compensation element 2

• – Einführen der Druckhülse zwischen das Gaswechselventil 6 und/oder dem Ventilteller und der Schraube 10

The hydraulic clearance compensation element 2 is usually mounted directly in the cylinder head material. in the in the 1 to 3 illustrated embodiment with the pressure sleeve 11 The process expands by the following process step after hanging the body 7 :

• - Inserting the pressure sleeve between the gas exchange valve 6 and / or the valve plate and the screw 10

So the screw 10 always aligned with the gas exchange valve and / or the valve plate is clean, the hook-shaped end 8th forked, with a width that is slightly wider than the width of a cam.

In simple embodiments, the hook-shaped end 8th also massive, ie not be designed forked, which, however, by applying or hooking the hand tool 1 next to the cam 4 a tilting moment occurs. Again, in another simple embodiment, the knurled nut can also be used 13 omitted. Also the pressure sleeve 11 is not absolutely necessary, which, however, a long Schraubweg is saved. Advantageously, the pressure sleeve 11 on the screw 10 facing side on an axial recess, whereby the axes of the screw 10 and the pressure sleeve 11 especially well aligned. In the present embodiment, the good escape of screw 10 , Pressure sleeve 11 and gas exchange valve 6 through the axial guide 12 supported. In a particularly simple embodiment, the axial guide 12 also omitted.

By the hand tool according to the invention 1 and the inventive method is considerably reduced working time in case of repair or reworking the series assembly line. In addition, subsequent errors are prevented in the otherwise necessary re-timing adjustment of the valve train.

1

hand tool

2

Lash adjuster

3

camshaft

4

cam

5

intermediate element

6

Gas exchange valve

7

body

8th

hooked The End

9

threaded hole

10

screw

11

pressure sleeve

12

axial guidance

13

knurled nut

14

valve spring

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• EP 1207637 B1 [0002]

Claims (7)

Hand tool ( 1 ) for disassembling a hydraulic clearance compensation element ( 2 ) from a cylinder head of an internal combustion engine with a valve train with a camshaft ( 3 ) whose cam ( 4 ) with an intermediate element ( 5 ) is in operative connection, on the one hand on a gas exchange valve ( 6 ) and on the other hand on the clearance compensation element ( 2 ), consisting of a basic body ( 7 ) with a hook-shaped end ( 8th ) connected to the camshaft ( 3 ) on the intermediate element ( 5 ) facing side, wherein the main body ( 7 ) on the hook-shaped end ( 8th ) facing away from a threaded hole ( 9 ) into which a screw ( 10 ) is screwed in such a way that the gas exchange valve ( 6 ) and / or one with the gas exchange valve ( 6 ) connected valve disk is depressible. Hand tool according to claim 1, characterized in that the hook-shaped end ( 8th ) is forked. Hand tool according to claim 2, characterized in that the hook-shaped bifurcated end ( 8th ) has a clear width which is larger than a cam width. Hand tool according to one of the claims 1 to 3, characterized in that between the screw ( 10 ) and the gas exchange valve ( 6 ) a pressure sleeve ( 11 ) can be arranged. Hand tool according to claim 4, characterized in that the basic body ( 7 ) and the pressure sleeve ( 11 ) a mutually corresponding axial guide ( 12 ) exhibit. Method for dismantling a hydraulic clearance compensation element ( 2 ) with a hand tool ( 1 ) according to one of the claims 1 to 5, characterized by the following method steps: 7 ) with its hook-shaped end ( 8th ) to the camshaft ( 3 ) on the intermediate element ( 5 ) facing side; - screwing in the screw ( 10 ) until it reaches the gas exchange valve ( 6 ) and / or the valve plate rests; - Further screwing in the screw ( 10 ) and depression of the gas exchange valve ( 6 ) and / or the valve disk until the intermediate element ( 5 ) is loose; - removing the intermediate element ( 5 ) and the clearance compensation element ( 2 ). Method according to claim 6, wherein between the screw ( 10 ) and the gas exchange valve ( 6 ) and / or the valve disk a pressure sleeve ( 11 ) is arranged, characterized by the following method step after the first method step: - introducing the pressure sleeve ( 11 ) between the screw ( 10 ) and the gas exchange valve ( 6 ) and / or the valve disk.