DE102007053515A1 - Device for displacing cylinder head of internal combustion engine, has cylinder tubes opposite to crankcase, where crankcase has two regulating shafts with eccentrics in its upper part supported on two sides of cylinder tubes - Google Patents

Abstract

The device (1) has cylinder tubes opposite to a crankcase (4). The crankcase has two regulating shafts (5,5') with an eccentric (6) in its an upper part supported on two sides of the cylinder tubes. The cylinder tubes directly or indirectly engage in bearing lugs of bearing pads (7) of a cylinder head (3). The regulating shafts are synchronously driven by an actuator (8) over each of a worm gear (9).

Description

The The invention relates to a device for an internal combustion engine for displacing a cylinder head with cylinder tubes opposite a crankcase with the features of the preamble of Patent claim 1.

It is based on the European patent specification EP 1 361 356 B1 out. In this a device for displacing the cylinder block and head with respect to the crankcase is known with the following design:
The crankshaft receiving crankcase has at its upper part on both sides of the cylinder mounted adjusting shafts with eccentric which are arranged alternately distributed over the length of the crankcase and engage in receiving bores of bearing webs or arms of the cylinder block, with the following features:
The connecting line of the bearing eyes or arms of the cylinder block is approximately perpendicular to the cylinder axis,
the bearings of the control shafts and their eccentric extend in the upper, near the cylinder head near the cylinder block,
the bearing lanes of the control shafts are arranged in the crankcase above hollow carrier-like support strips which extend over the length of the crankcase.

in principle the device described above has no disadvantages, however The invention is based on the object, an adjusting mechanism for displacing the cylinder block and head with respect to Show crankcase.

These The object is achieved by the features in the characterizing part of the claim 1 solved.

The Device according to the invention is particularly simple drivable and beyond extreme robust.

By The embodiment according to claim 2 become Compensated manufacturing tolerances of the eccentric and their bearings whereby a tilting of the cylinder head with cylinder tubes opposite the crankcase is safely avoided.

Especially is preferred as an actuator according to claim 3 provided an electrical and / or hydraulic actuator.

The Embodiment according to claim 4 is a particularly space-saving and small construction arrangement.

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

1 shows a plan view of a three-dimensional illustrated inventively designed internal combustion engine from a front side.

2 shows a plan view of the three-dimensional illustrated inventively designed internal combustion engine from a rear side.

in the Following apply in both figures for the same components the same reference numbers.

1 shows a plan view of a three-dimensional illustrated inventively designed internal combustion engine 2 from a front side. The internal combustion engine 2 consists essentially of a crankcase 4 with one to the crankcase 4 installed cylinder head 3 , are arranged on the not explicitly shown cylinder tubes. Furthermore, the internal combustion engine 2 a device 1 on, for relocating the cylinder head 3 with the cylinder tubes opposite the crankcase 4 , For this purpose, the crankcase 4 in its upper part two on both sides of the cylinder tubes mounted adjusting shafts 5 . 5 ' with eccentrics 6 . 6 ' on, in the present embodiment, indirectly in bearing eyes of bearing webs 7 . 7 ' of the cylinder head 3 intervention. A connecting line of the bearing eyes of each control shaft 5 . 5 ' is approximately perpendicular to a Zylinderrohrachse. The eccentrics 6 . 6 ' have the same radial orientation. Next run the bearings of the adjusting shafts 5 . 5 ' and their eccentric 6 . 6 ' in the upper, the cylinder head 3 near the crankcase 4 , The bearing lanes of the adjusting shafts 5 . 5 ' are in the crankcase 4 arranged, with the cylinder head 3 with the cylinder tubes in at least one linear bearing relative to the crankcase 4 is guided, which is aligned in the direction of the cylinder tube axis.

According to the invention, the control shafts 5 . 5 ' with an actuator 8th via one worm gear each 9 . 9 ' can be driven synchronously. In the present embodiment, the control shafts 5 . 5 ' with their eccentrics 6 . 6 ' not directly in bearing eyes of bearing bars 7 . 7 ' of the cylinder head 3 engaged, but are indirectly via a guide element 11 and a clearance balance shaft 10 with the jambs 7 in the cylinder head 3 connected. Through the play balance shaft 10 Manufacturing tolerances that occur in the eccentric production or storage production can be compensated, so that when adjusting the cylinder head 3 against the crankcase 4 a tilting of the components to each other is safely avoided. The actuating element is preferred 8th an electric and / or hydraulic actuator. In the particularly preferred embodiment, the actuating element 8th and the worm gears 9 . 9 ' largely on the front side of the spa belgehäuse 4 arranged, whereby only little space is needed.

2 shows the same engine 2 out 1 again in a three-dimensional view, but from a back. in 2 is the eccentric 6 ' particularly recognizable, as a bearing cap of the control shaft 5 ' not shown.

A short description of the internal combustion engine 2 in other words

• ⇒ Dem Zylinderkopf 3 mit Zylinderlaufbuchsen und
• ⇒ dem Kurbelgehäuse 4.

The internal combustion engine 2 consists essentially of two relatively moving parts:

• ⇒ The cylinder head 3 with cylinder liners and
• ⇒ the crankcase 4 ,

On each side of the internal combustion engine 2 is one along the internal combustion engine 2 arranged eccentric shaft, each consisting of a control shaft 5 . 5 ' with the eccentrics 6 . 6 ' , in lateral sprues in the crankcase 4 stored. Likewise, on each side, there is an axle in downwardly directed sprues on the cylinder head 3 stored. The eccentric shaft and the play balance shaft 10 are about at least one guide element 11 connected per page.

The two eccentric shafts are synchronized via a respective worm gear according to the invention by a servomotor, the actuator 8th , powered. When adjusting the eccentric shafts (maximum 180 °), the cylinder head moves 3 relative to the crankcase 4 (maximum adjustment = 2 × eccentricity) in the direction of the cylinder axis.

The cylinder head 3 is on each side with at least one linear bearing, in the 1 and 2 not shown, in the crankcase 4 guided. These linear bearings have one degree of freedom only in Zylinderrohrachsrichtung. A piston stroke curve is thus independent of a set compression, this means that no unwanted set in the crank mechanism occurs.

The crankcase 4 and the cylinder head 3 are preferably circulating over movable seals, which are also in the 1 and 2 not shown connected.

The embodiment of the invention is a particularly robust and simple device 1 for the internal combustion engine 2 achieved, to relocate the cylinder head 3 with the cylinder tubes opposite the crankcase 4 ,

1.

contraption

Second

Internal combustion engine

Third

cylinder head

4th

crankcase

5, 5 '

actuating shaft

6 6 '

eccentric

7th

bearing web

8th.

actuator

9 9 '

worm gear

10th

Game balance shaft

11th

guide element

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 1361356 B1 [0002]

Claims (4)

Contraption ( 1 ) for an internal combustion engine ( 2 ) for displacing a cylinder head ( 3 ) with cylinder tubes opposite a crankcase ( 4 ) of the following type: - the crankcase ( 4 ) has in its upper part two on both sides of the cylinder tubes mounted adjusting shafts ( 5 . 5 ' ) with eccentrics ( 6 . 6 ' ) directly or indirectly in bearing eyes of 7 . 7 ' ) of the cylinder head ( 3 ), wherein - a connecting line of the bearing eyes of each control shaft ( 5 . 5 ' ) is approximately perpendicular to a cylinder tube axis, - wherein the eccentric ( 6 . 6 ' ) have the same radial orientation and - the bearings of the control shafts ( 5 . 5 ' ) and its eccentric ( 6 . 6 ' ) in the upper, the cylinder head ( 3 ) near the crankcase ( 4 ) and - the bearing lanes of the control shafts ( 5 . 5 ' ) in the crankcase ( 4 ), wherein - the cylinder head ( 3 ) with the cylinder tubes in a linear bearing relative to the crankcase ( 4 ) is guided, which is aligned in the direction of the cylinder tube axis, characterized in that the adjusting shafts ( 5 . 5 ' ) with an actuating element ( 8th ) via a respective worm gear ( 9 . 9 ' ) are driven synchronously. Device according to claim 1, characterized in that parallel to a control shaft ( 5 . 5 ' ) on one side of the cylinder head ( 3 ) a clearance balance shaft ( 10 ) is provided, on the one hand in the bearing webs ( 7 ) in the cylinder head ( 3 ) and on the other hand in at least one guiding element ( 11 ), which with the eccentrics ( 6 . 6 ' ) of the adjacent control shaft ( 5 . 5 ' ) is in operative connection, is stored. Device according to claim 1 or 2, characterized in that the actuating element ( 8th ) is an electrical and / or hydraulic actuator. Device according to one of the claims 1 to 3, characterized in that the actuating element ( 8th ) and the worm gears ( 9 . 9 ' ) largely on the front side of the crankcase ( 4 ) are arranged.