DE102015221013A1 - Assembly of a valve train of an internal combustion engine - Google Patents

Abstract

Proposed is an assembly (1) of an OHV valve train of an internal combustion engine, comprising a bearing column (2) and at least one rocker arm (3), which bearing column (2) can be fastened to a cylinder head (19) of the internal combustion engine and has storage means (4), on which the rocker arm (3) sits, which consists of two by a crossbar (5) connected side walls (6), wherein the crossbar (5) on its underside (7) at one end (8) with a system (9) for a gas exchange valve and at another end (10) with a contact surface (11) is provided for a push rod, wherein of the bearing column (2) orthogonal an axis as a storage means (4) for the at least one rocker arm (3) protrudes, which rocker arm ( 3) in cross-section substantially inverted U-shaped with internal system (9) and contact surface (11) and in the top (12) has a continuous, partially cylindrical transverse indentation (13), via which it at an underside (14) of Oh se (4) is nestled.

Description

The invention relates to an assembly of an OHV valve train of an internal combustion engine, comprising a bearing column and at least one rocker arm, which bearing column on a cylinder head of the internal combustion engine can be fastened and has storage means on which the rocker sits, which consists of two connected by a cross bar side walls, said the crossbar is provided on its underside at one end with a system for a gas exchange valve and at another end with a contact surface for a push rod.

A generic assembly goes off 2 of the DE 103 02 469 A1 out. As a storage column, a solid bearing block is provided, on which a bearing pin is pivotally mounted as a storage means via a dome connection. The bearing pin carries a massive needle bearing via a radial rocker arm and is fixed to the bearing block via a bolt piercing this on a cylinder head of the internal combustion engine.

For a variety of internal combustion engines (1- or 2-cylinder technology), such as. For small devices such as lawn mowers, chainsaws and for mopeds and stationary stationary power generators, the aforementioned valve train assembly is overdesigned. It builds too complicated, can be mounted only relatively complex and is therefore too expensive.

It is an object of the invention to provide an assembly as mentioned above, which is constructed very simple and thus inexpensive.

According to the invention, this object is achieved in that orthogonally protrudes from the bearing column axis as a storage means for the at least one rocker arm, which rocker arm in cross-section substantially inverted U-shaped with internal system and contact surface and in the top has a continuous, partially cylindrical transverse indentation , via which it is nestled on a lower side of the axle.

Thus, a very simple, easy-to-install, and inexpensive assembly is particularly, but not exclusively, for the small-power-appliance industry. The rocker arm is preferably made of sheet steel and has a reverse U-profile for good rigidity in cross-section. The transverse formation in the crossbeam is preferably chosen with a particularly large diameter, so that in this case is to be expected at Achskontakt with only a small load and little wear. It is clear at this point that the axis is formed as the storage means complementary to the transverse formation, so that there is a good osculation. Alternatively, the axle may also extend through holes in the side walls of the rocker arm.

Although it is intended to protrude from the bearing column only on one side of a stub axle. Preferably, however, the axle (thru axle) should wear on both sides.

The axis can be designed as a separate component and in a respective transverse bore of the bearing column, for example. Pressed, caulked, welded or screwed with this. Conceivable and intended, however, is also a one-piece design of the axle with bearing column, as it can be achieved, for example, by casting, forging or in an MIM process.

Furthermore, it is provided in concretization of the invention to make the bearing column to create a possibility of a valve clearance adjustment height adjustable. Possibly. can also be dispensed with for particularly low-cost types of internal combustion engines on the adjustment or Nachjustiermöglichkeit.

In a further development of the invention, the contact surface for the push rod, more precisely for the spherical head, be present as a one-piece in the crossbar shaped dome.

A simple lateral guide possibility for a shaft of the gas exchange valve is given by its lateral contact with inner surfaces of the side walls of the rocker arm. Thus, it is possible to dispense with separate tabs or the like. Likewise, it is proposed not to prepare the crossbar area in the system for the valve stem separately.

The roof-like side line of the rocker arm according to another subclaim saves space in the region of both ends and at the same time allows a sufficiently large radius of the part-cylindrical indentation for the axis.

The protection of the invention also relates to the above-described sheet metal tilt lever with transverse indentation alone.

To the drawing:

1 shows in a spatial view of an assembly in contact with gas exchange valves and pushrods and the

2 . 3 show in spatial views the rocker arm of the assembly.

Is shown in 1 an assembly 1 a rocker valve valve drive of a single-cylinder internal combustion engine.

Shown is an assembly 1 consisting of an upright bearing column 2 as well as two rocker arms 3 (Inlet and outlet rocker arms) made of thin-walled sheet steel. The storage column 2 is with a cylinder head 19 the internal combustion engine bolted.

Each rocker arm 3 points two through an overhead crossbeam 5 connected side walls 6 on and has in cross-section an inverted U-profile. The crossbeam 5 is on its inside bottom 7 at one end 8th with a facility 9 for a gas exchange valve 17 and at another end 10 with a contact surface 11 for a pushrod 18 Mistake. The attachment 9 is how good 2 is removable, not separately on the crossbar 5 of the rocker arm 3 formed. A lateral guidance of the respective gas exchange valve 17 takes place on inner surfaces 16 the side walls 6 , The contact surface 11 for the pushrod 18 however, lies as one piece in the crossbar 5 shaped dome with a comparatively large radius.

In a top 12 of the crossbeam 5 lies a continuous, partially cylindrical transverse indentation 13 (Sat. 3 ), over which the respective rocker arm 3 when nestled nestled on a bottom 14 a stub axle stump 15 the separate axis 4 runs. The side walls 6 of the rocker arm 3 in this case rise in the direction of the transverse indentation 13 roof-like.

The bearing column is used to set a valve clearance during initial assembly and when servicing 2 in terms of height adjustable on the cylinder head 19 held. It is present as a screw.

LIST OF REFERENCE NUMBERS

1

 module

2

 storage column

3

 rocker arm

4

 Storage means, axle

5

 crossbeam

6

 Side wall

7

 bottom

8th

 an end

9

 investment

10

other end

11

contact area

12

top

13

transverse recess

14

bottom

15

Thru axle stub

16

palm

17

Gas exchange valve

18

pushrod

19

cylinder head

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

• DE 10302469 A1 [0002]

Claims (9)

Assembly ( 1 ) of an OHV valve drive of an internal combustion engine, comprising a bearing column ( 2 ) and at least one rocker arm ( 3 ), which bearing column ( 2 ) on a cylinder head ( 19 ) of the internal combustion engine is fastened and storage means ( 4 ) on which the rocker arm ( 3 ), which consists of two by a crossbeam ( 5 ) connected side walls ( 6 ), the crossbeam ( 5 ) on its underside ( 7 ) at one end ( 8th ) with a plant ( 9 ) for a gas exchange valve and at another end ( 10 ) with a contact surface ( 11 ) is provided for a push rod, characterized in that from the storage column ( 2 ) orthogonally an axis as storage means ( 4 ) for the at least one rocker arm ( 3 ) protrudes which rocker arm ( 3 ) in cross-section substantially inverted U-shaped with internal system ( 9 ) and contact surface ( 11 ) and in its top ( 12 ) a continuous, partially cylindrical transverse indentation ( 13 ), over which he has at a bottom ( 14 ) of the axis ( 4 ) nestled. An assembly according to claim 1, characterized in that the rocker arm ( 3 ) punch-bending technology of sheet steel is shown. Assembly according to claim 1, characterized in that the axis ( 4 ) as the storage column ( 2 ) on both sides piercing thru axle is present, wherein at each stub axle ( 15 ) a rocker arm ( 3 ) is created. Subassembly according to Claim 1, characterized in that the bearing column ( 2 ) is designed as a screw, on the height adjustment a valve clearance adjustment is possible. An assembly according to claim 1, characterized in that a lateral guide of the gas exchange valve ( 17 ) in the area of the installation ( 9 ) of the rocker arm ( 3 ) by inner surfaces ( 16 ) of its side walls ( 6 ) is provided. An assembly according to claim 1, characterized in that the contact surface ( 11 ) for the push rod ( 18 ) in the bottom ( 7 ) of the crossbeam ( 5 ) of the rocker arm ( 3 ) is present as a one-piece molded dome. Assembly according to claim 1, characterized in that the plant ( 8th ) for the gas exchange valve in the bottom ( 7 ) of the crossbeam ( 5 ) unformed-plan to the other course of the crossbeam ( 5 ) correlates. An assembly according to claim 1, characterized in that the side walls ( 6 ) of the rocker arm ( 3 ) of both ends ( 8th . 10 ) seen roof-like towards the transverse formation ( 13 ) increase. Assembly according to one of the preceding claims, characterized in that the assembly ( 1 ) is intended for use in a 1-cylinder small or moped engine.

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