DE102009054054A1 - Mounting arrangement and method for mounting a pressure accumulator for internal combustion engines - Google Patents

Abstract

The invention relates to a mounting arrangement for installation in a cavity for mounting a pressure accumulator for the pressure supply of at least one consumer of an internal combustion engine, comprising: a displacement element for application by a pressure medium; a force accumulator cooperating with the displacement element; a guide element for guiding the force accumulator, wherein the force accumulator is supported on the displacement element and on the guide element such that the displacement element is displaceable against the force of the force accumulator; and a locking mechanism, by means of which the displacement element can be releasably locked in a locking position exciting the force accumulator. Furthermore, it relates to a method for mounting a pressure accumulator, in which such a mounting arrangement with locked displacement element inserted into the cavity, the connection between a locking element and the displacement element is released and the locking element is removed from the mounting arrangement.

Description

Field of the invention

The invention is in the technical field of internal combustion engines and relates to a mounting arrangement and a method for mounting a pressure accumulator for the pressure supply of at least one consumer of an internal combustion engine.

State of the art

From the patent EP 1197641 A2 a pressure accumulator for assisting a hydraulically adjustable camshaft is known, is controlled at a pressure medium flow in or out of the pressure accumulator by using different solenoid valves.

The German patent application DE 10 2007 056 684 A1 the applicant shows a pressure accumulator with a separate housing.

Furthermore, the German Offenlegungsschrift describes DE 10228354 A1 a built-in an internal cavity of a camshaft pressure accumulator, which space can be saved in the internal combustion engine.

Object of the invention

In contrast, the object of the present invention is to simplify the assembly of an integrated pressure accumulator in a camshaft.

Solution of the task

These and other objects are achieved according to the proposal of the invention by a mounting arrangement and a method for mounting a pressure accumulator with the features of the independent claims. Advantageous embodiments of the invention are indicated by the features of the subclaims.

According to a first aspect of the invention, a mounting arrangement for installation in a storage cavity for mounting a (passive) pressure accumulator is shown. The accumulator is used to supply pressure at least one consumer of an internal combustion engine. Advantageously, but not necessarily, the cavity for mounting the mounting assembly is formed by an inner cavity of a camshaft to produce an integrated pressure accumulator in the camshaft. The consumer may in particular be a hydraulic camshaft adjuster for adjusting the phase angle between crankshaft and camshaft. However, it is also conceivable that the device is used for example in an electro-hydraulic valve actuating device of the internal combustion engine.

The mounting arrangement comprises a displacement element to be acted upon by a pressure medium. The displacement element can be designed, for example, in the form of a piston with an end-face pressure surface. It further comprises a cooperating with the displacement element energy storage, and a guide element for guiding the force accumulator, wherein the energy storage on the displacement element and the guide element supported such that the displacement element against the force of the energy storage in a locked position with tensioned or charged energy storage is displaced.

Advantageously, but not necessarily, the guide element forms a stop, by which the locking position of the displacement element is defined. The energy accumulator is designed for example as a spring element, in particular in the form of a compression spring, but also any other suitable spring type can be used. The guide member may be formed, for example in the form of a stepped piston with an annular step, wherein the annular step may serve to support the compression spring.

Furthermore, the mounting arrangement comprises a locking mechanism, by means of which the displacement element can be releasably locked in its locking position.

The mounting arrangement according to the invention thus enables easy mounting of the pressure accumulator in the cavity, for example in an inner cavity of a camshaft, in which, unlike the conventional procedure no individual parts are installed in each case in the cavity, but the mounting assembly is inserted in one piece in the cavity , In particular, the difficult assembly of a compression spring as an energy storage is facilitated, which can buckle laterally in the relaxed state. On the provision of an alternative Hüllkartusche in which the compression spring is received and which can then be used in a mating bore of the camshaft, can be dispensed with, which saves costs in industrial mass production.

In an advantageous embodiment of the mounting arrangement according to the invention, the locking mechanism has a locking element passing through a passage opening of the guide element, which locking element can be brought into engagement with the displacement element brought into the locking position. In this case, the locking element has a stop which is designed such that it, when the locking element in engagement with the displacement element, can pass by being acted upon by the force storage device against the guide element. Advantageously, but not necessarily, the locking element in the form of a removably arranged in the passage opening locking rod is formed.

The displacement element may for example have an undercut into which the locking element can engage for locking the displacement element. In this case, the undercut may be formed, for example in the form of an annular groove. Alternatively, the displacement element may, for example, be provided with a thread which can be brought into threaded engagement with a mating thread of the locking element in order to lock the displacement element. In this case, it may be advantageous if, in addition, a device for the rotationally fixed connection of guide element and displacement element in the tensioned locking position is provided. The device for non-rotatable connection of guide element and displacement element may, for example, comprise at least one projection integrally formed on the guide element, which can engage positively in a recess of the displacement element in the locking position. In addition, the locking element may for example be provided with a handle for passing and removing from the through hole.

These measures allow a technically simple realization of the locking mechanism for locking the displacement element in the locking position.

• – einen Schritt zum Vormontieren einer Baugruppe, welche ein Verlagerungselement zur Beaufschlagung durch ein Druckmittel, einen mit dem Verlagerungselement zusammenwirkenden Kraftspeicher, sowie ein Führungselement zur Führung des Kraftspeichers umfasst, wobei sich der Kraftspeicher am Verlagerungselement und am Führungselement derart abstützt, dass das Verlagerungselement gegen die Kraft des Kraftspeichers verlagerbar ist,
• – einen Schritt zum Verlagern des Verlagerungselements in eine den Kraftspeicher spannende Arretierstellung,
• – einen Schritt zum Einbringen eines Arretierelements durch eine Durchgangsöffnung des Führungselements,
• – einen Schritt zum Verbinden des Arretierelements in gespannter Arretierstellung mit dem Verlagerungselement, wodurch eine Montageanordnung gebildet wird,
• – einen Schritt zum Einsetzen der Montageanordnung in einen ein Speichergehäuse für den Druckspeicher formenden Hohlraum,
• – einen Schritt zum Lösen der Verbindung zwischen Arretierelement und Verlagerungselement, sowie
• – einen Schritt zum Entnehmen des Arretierelements aus der Durchgangsöffnung.

According to a second aspect of the invention, a method for mounting a passive pressure accumulator for the pressure supply of at least one consumer of an internal combustion engine is shown. The method comprises:

• A step for preassembling a subassembly which comprises a displacement element for acting on a pressure medium, a force accumulator cooperating with the displacement element, and a guide element for guiding the force accumulator, the force accumulator being supported on the displacement element and on the guide element in such a way that the displacement element bears against the displacement element Force of the energy storage is displaceable,
• A step for displacing the displacing element into a locking position exciting the force accumulator,
• A step for introducing a locking element through a passage opening of the guide element,
• A step for connecting the locking element in the tensioned locking position to the displacement element, whereby a mounting arrangement is formed,
• A step for inserting the mounting arrangement into a storage housing for the accumulator-forming cavity,
• - A step for releasing the connection between the locking element and the displacement element, as well
• - A step for removing the locking member from the through hole.

Brief description of the drawings

The invention will now be explained in more detail by means of embodiments, reference being made to the accompanying drawings. Identical or equivalent elements are denoted by the same reference numerals in the drawings. Show it:

1A - 1B a schematic Axialschnittdarstellung ( 1A ) and a schematic perspective view ( 1B ) of a first embodiment of the mounting arrangement according to the invention;

2 an enlarged perspective view of the mounting arrangement of 1A - 1B without displacement body;

3A - 3B a schematic Axialschnittdarstellung ( 3A ) and a 90 ° rotated Axialschnittdarstellung ( 3B ) of a second embodiment of the mounting arrangement according to the invention;

4A - 4B an enlarged perspective view of the displacement body ( 4A ) of the mounting arrangement of 3A - 3B , As well as a perspective view of the guide body of this mounting arrangement.

Detailed description of the drawings

In the 1A - 1B and 2 is a first embodiment of the mounting arrangement according to the invention for mounting a passive pressure accumulator illustrated in an inner cavity of a camshaft. The pressure accumulator serves to supply pressure to one or more consumers of an internal combustion engine. The total with the reference number 1 designated mounting arrangement comprises one here, for example in the form of a cylindrical hollow piston with an end wall 33 trained displacement body 2 , the interposition of a helical compression spring 4 on a formed in the form of a cylindrical stepped piston guide body 3 is attached. In this case, the helical compression spring is supported 4 with one end at an annular step 7 and with its other end on an annular support surface 8th in the cavity 18 of the displacement body 2 from. Of the guide body 3 includes a first section 5 with a smaller diameter and a second section 6 with a larger diameter, eliminating the step 7 is formed. The helical compression spring 4 surrounds with the exception of one end section 10 the first section 5 of the leadership body 3 , so that the helical compression spring 4 from the guide body 3 mostly guided. The displacement body 2 can counter to the spring force of the helical compression spring 4 be moved axially. When installed, an inner wall of the storage cavity of the camshaft as an axial guide surface for moving the displacement body 2 serve.

When relocating the relocation body 2 against the spring force of the helical compression spring 4 serves a first end face 10 of the leadership body 3 as a stop for the displacement body 2 , whereby an end or locking position in the tensioned state of the helical compression spring 4 is defined. When installed, the displacement body 2 by frontal application of pressure medium one of the end wall 33 shaped printing surface 9 against the spring force of the helical compression spring 4 be moved axially. On the other hand, the displacement body 2 by the spring force of the tensioned helical compression spring 4 reset as soon as the on the printing surface 9 acting pressure force is overprinted by the spring force. The mounting arrangement is used to produce a passive or non-switchable pressure accumulator.

The mounting arrangement 1 further comprises a cylindrical locking rod 13 in a central through-hole 12 of the leadership body 3 is removably received. One in the form of a hook 16 trained, on side of the relocation body 2 befindlicher end portion of the locking rod 13 protrudes from the central through-hole 12 out. The hook 16 acts with a locking pin 17 together, an opening of the printing surface 9 the displacement body interspersed, wherein a pin head 22 the printing surface 9 abuts and a locking portion 19 in the cavity 18 of the displacement body 2 dips. The locking pin 17 is with the relocation body 2 firmly connected and can for example as Stecknietverbindung between the pin head 22 and the locking portion 19 be formed, but also any other suitable connection technology can be used.

Becomes the displacement body 2 against the spring force of the helical compression spring 4 until he moves his through the first face 10 of the leadership body 3 reaches defined locking position, the hook can 16 in one of the locking section 19 of the locking pin 17 shaped, circumferentially extending annular groove 20 to grab.

In 2 is the catch 16 in an enlarged view without displacement body 2 but with locking pin 17 shown. As 2 is removable, is the catch 16 for this purpose with a half ring 23 provided in the annular groove 20 can grab. It is through the annular groove 20 an undercut formed with the locking rod 13 over the half ring 23 is positively connected in the axial direction. Thus, the locking bar 13 by the spring force of the tensioned helical compression spring 4 applied. A relaxation of the helical compression spring 4 or a displacement of the displacement body 2 by the spring force is through an outside of the through hole 12 located, to the locking rod 13 molded, annular radial collar 14 prevents the plant from abutting against a second end face 24 of the leadership body 3 arrives. Through the Radialbund 14 becomes the locking rod 13 and thus the displacement body 2 axially fixed in the locked position.

In 3A and 3B is a second embodiment of the mounting arrangement according to the invention 1 illustrates, wherein the two figures show a rotated by 90 ° sectional view. To avoid unnecessary repetition, only the differences from the first embodiment will be explained and otherwise reference is made to the statements made there.

Accordingly, another locking mechanism 15 for the displacement body 2 realized in the locked position. The displacement body 2 is for this purpose with a threaded sleeve 25 provided, which here, for example, an internal thread 27 having. Instead of a hook 16 is an end portion of the locking bar 13 as a threaded section 26 formed, which has an external thread 28 carries that in threaded engagement with the female thread 27 of the displacement body 2 can be brought. Here is the threaded section 26 arranged so that it is in the threaded sleeve 25 of the displacement body brought into the locking position 2 can grab, with the Radialbund 14 then the second end face 24 of the leadership body 3 is applied. Thus, the displacement body 2 in the locked position by the placed in position locking rod 13 axially fixed and can not be moved.

To twist the locking rod 13 relative to the displacement body 2 Reliable to enable is a locking device 29 for the rotationally fixed locking of the displacement body 2 in lock position available. The locking device 29 includes protrusions 30 that from the first end face 10 of the leadership body 3 protrude axially. The projections 30 are here, for example, by incorporating a central radial groove 31 shaped so that the projections 30 are designed as ring pieces. The projections 30 can in correspondingly shaped recesses 32 the front wall 33 of the displacement body 2 grab when it is in the locked position. Here are the two projections 30 in positive engagement with the two recesses 32 so that the displacement body 2 rotatably with the guide body 3 connected is.

For assembly of the pressure accumulator, an assembly is first preassembled by the helical compression spring 4 on the guide body 3 deferred and then the displacement body 2 on the helical compression spring 4 is put on. Then the locking bar 13 into the through hole 12 used and the displacement body 2 For example, manually against the spring force of the helical compression spring 4 moved until it stops against the first face 10 arrives. In this locking position of the displacement body 2 becomes the locking rod 13 with the displacement body 2 firmly connected by, as stated above, the hook 16 on the locking pin 17 mounted or a threaded connection is made. This mounting arrangement with fixed in locking position displacement body 2 can now be easily inserted in one piece in the inner cavity of the camshaft. The mounting arrangement is usually used from a front end of the camshaft ago. If the mounting arrangement is placed in the cavity of the camshaft in position, the locking rod 13 solved by the hook 16 from the displacement body 2 unmounted or the threaded connection between locking rod 13 and displacement body 2 is solved. The displacement body 2 is then by the spring force of the helical compression spring 4 brought into a relaxed position, which may be defined for example by a shaped by the camshaft stop. The locking rod 13 is removed and can then be used for mounting another accumulator.

LIST OF REFERENCE NUMBERS

1

mounting arrangement

2

shifting body

3

guide body

4

Helical compression spring

5

first section

6

second part

7

step

8th

support surface

9

print area

10

first end face

11

end

12

Through Hole

13

locking bar

14

radial collar

15

locking mechanism

16

hook

17

locking pin

18

cavity

19

locking section

20

ring groove

21

perforation

22

pinhead

23

half ring

24

second end face

25

threaded sleeve

26

threaded portion

27

inner thread

28

external thread

29

locking device

30

head Start

31

radial groove

32

recess

33

bulkhead

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• EP 1197641 A2 [0002]
• DE 102007056684 A1 [0003]
• DE 10228354 A1 [0004]

Claims (14)

Mounting arrangement ( 1 ) for installation in a cavity for mounting a pressure accumulator for the pressure supply of at least one consumer of an internal combustion engine, comprising: - a displacement element ( 2 ) to be acted upon by a pressure medium, - one with the displacement element ( 2 ) cooperating energy store ( 4 ), - a guiding element ( 3 ) for guiding the energy storage device ( 4 ), whereby the energy store ( 4 ) at the displacement element ( 2 ) and on the guide element ( 3 ) is supported such that the displacement element ( 2 ) against the force of the energy store ( 4 ) is displaceable, - a locking mechanism ( 16 . 17 ; 25 . 26 ), by which the displacement element ( 2 ) in an energy store ( 4 ) exciting locking position can be releasably locked. Mounting arrangement ( 1 ) according to claim 1, characterized in that the locking mechanism has a passage opening ( 12 ) of the guide element ( 3 ) passing through locking element ( 13 ), which with the brought into the locking position displacement element ( 2 ) is engageable, wherein the locking element ( 13 ) a stop ( 14 ), which can reach in the engaged state to rest against the guide element. Mounting arrangement ( 1 ) according to claim 2, characterized in that the displacement element ( 2 ) an undercut ( 20 ), in which the locking element ( 13 ) for locking the displacement element ( 2 ) can grab. Mounting arrangement ( 1 ) according to claim 3, characterized in that the undercut in the form of an annular groove ( 20 ) is trained. Mounting arrangement ( 1 ) according to claim 2, characterized in that the displacement element ( 2 ) with a thread ( 27 ) provided for locking the displacement element ( 2 ) in threaded engagement with a mating thread ( 28 ) of the locking element ( 13 ) can be brought. Mounting arrangement ( 1 ) according to claim 5, characterized by a device ( 29 ) for non-rotatable connection of guide element ( 3 ) and displacement element ( 2 ) in locking position. Mounting arrangement ( 1 ) according to claim 6, characterized in that the device ( 30 . 32 ) for non-rotatable connection of guide element ( 3 ) and displacement element ( 2 ) at least one on the guide element ( 3 ) molded projection ( 30 ), which positively in a recess ( 32 ) of the displacement element ( 2 ) can grab. Mounting arrangement ( 1 ) according to one of claims 1 to 7, characterized in that the energy accumulator in the form of a compression spring, for example helical compression spring ( 4 ), is trained. Mounting arrangement ( 1 ) according to claim 8, characterized in that the guide element ( 3 ) in the form of a stepped piston with an annular step ( 7 ), wherein the stage ( 7 ) for supporting the compression spring ( 4 ) serves. Mounting arrangement ( 1 ) according to one of claims 1 to 9, characterized in that the guide element ( 3 ) a stop ( 10 ) for the displacement element ( 2 ) in locking position. Mounting arrangement ( 1 ) according to one of claims 2 to 10, characterized in that locking element in the form of a locking rod ( 13 ) is trained. Mounting arrangement ( 1 ) according to one of claims 2 to 10, characterized in that the locking element ( 13 ) is provided with a handle for its manual operation. Mounting arrangement ( 1 ) according to one of claims 1 to 12, which is adapted for installation in a cavity formed by a camshaft suitable. Method for mounting a pressure accumulator for the pressure supply of at least one consumer of an internal combustion engine, comprising the following steps: pre-assembly of an assembly which has a displacement element ( 2 ) to be acted upon by a pressure medium, one with the displacement element ( 2 ) cooperating energy store ( 4 ), as well as a guide element ( 3 ) for guiding the energy storage device ( 4 ), wherein the energy store ( 4 ) at the displacement element ( 2 ) and on the guide element ( 3 ) is supported such that the displacement element ( 2 ) against the force of the energy store ( 4 ) is displaceable; Shifting the displacement element into a force storage device ( 4 ) exciting locking position; Inserting a locking element ( 13 ) through a passage opening ( 12 ) of the guide element ( 3 ); Connecting the locking element ( 13 ) with the displacement element ( 2 ), whereby a mounting arrangement ( 1 ) is formed; Inserting the mounting arrangement ( 1 ) in a storage housing for the pressure accumulator-forming cavity; Release the connection between the locking element ( 13 ) and displacement element ( 2 ); Removing the locking element ( 13 ) from the passage opening ( 12 ).

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