EP3494290A1

EP3494290A1 - Cylinder head cover module and method for the production thereof

Info

Publication number: EP3494290A1
Application number: EP17748477.1A
Authority: EP
Inventors: Heiko Schmid
Original assignee: ThyssenKrupp AG; ThyssenKrupp Presta TecCenter AG
Current assignee: ThyssenKrupp AG; Thyssenkrupp Dynamic Components Teccenter AG
Priority date: 2016-08-05
Filing date: 2017-08-03
Publication date: 2019-06-12
Anticipated expiration: 2037-08-03
Also published as: DE102016114602A1; CN109661506B; US20190203659A1; CN109661506A; US10738732B2; EP3494290B1; WO2018024812A1

Abstract

The present invention relates to a cylinder head cover module (100) and to a method for producing such a cylinder head cover module (100) for arrangement on a cylinder head of an internal combustion engine, wherein the cylinder head cover module (100) comprises a cover body (110) and a camshaft (210) arranged therein, and wherein the cover body (110) has an opening (130), a bearing element (300) being pressed into the opening (130). According to the invention, the camshaft (210) is rotatably mounted in the bearing element (300), and the bearing element (300) seals off the opening (130) of the cover body (110) from the exterior.

Description

Cylinder head cover module and method for its production

description

The present invention relates to a cylinder head cover module for mounting on a cylinder head of an internal combustion engine and a method for producing such a cylinder head cover module with a hood body and a camshaft disposed therein, wherein the hood body has an opening.

State of the art

In order to reduce the assembly effort in assembling an internal combustion engine of a motor vehicle and to reduce the storage and logistics costs in the motor assembly, the automotive manufacturers are already delivered by the suppliers already assembled motor modules directly to the assembly line. Such motor modules consist e.g. from a cylinder head cover module with one or more camshafts mounted therein. As part of the engine assembly then only this cylinder head module is attached to the cylinder head of the engine.

From DE 10 2010 045 047 AI, for example, a method for assembling a module for a motor vehicle engine with at least one cylinder head cover module and a camshaft mounted therein is known.

Camshafts in such cylinder head cover modules are in operation of the corresponding internal combustion engine usually comparatively high loads, in particular bending loads, and exposed to forces. It is desirable to improve cylinder head cover modules in that the camshaft can withstand such high loads, bending loads and forces.

Disclosure of the invention

According to the invention, a cylinder head cover module for mounting on a cylinder head of an internal combustion engine and a method for producing such a cylinder head cover module having the features of the independent claims are proposed. Advantageous embodiments are the subject of the dependent claims and the following description. Embodiments and advantages of the cylinder head cover module according to the invention and the inventive method for producing such a cylinder head cover module will become apparent from the following description in an analogous manner.

The cylinder head cover module has a hood body and a camshaft disposed therein. The hood body has an opening into which a bearing element is pressed. The camshaft is rotatably mounted in the bearing element, expediently at one of its ends. The bearing element seals the opening of the hood body to the outside. In particular, the opening is sealed by the bearing element oil-tight and / or waterproof. It is understood that the hood body may also have a plurality of such openings, in each of which such a bearing element is pressed.

In this context, the term "cylinder head cover module" is understood to mean a composite component which can be arranged on a cylinder head of an internal combustion engine. The term "hood body" is a basic body of the cylinder head cover module to understand, in which be introduced and fixed during the manufacturing process of the cylinder head cover module further elements such as the camshaft. The hood body may for example be cast or injected, for example made of plastic.

The cylinder head cover module may have further expedient elements, for example, further bearings in which the camshaft is rotatably mounted. The camshaft expediently comprises a tube or a support shaft on which a plurality of cams is arranged. In addition to the cams, further components may be arranged on the support shaft, e.g. a Nockenwellengeberrad for the determination of a rotational angle of the camshaft and / or a pump cam for driving a fuel and / or injection pump.

It is understood that the cylinder head cover module may also have a plurality of camshafts. It can be pressed into a corresponding opening in accordance with the invention for several or all of these camshafts, a bearing element.

In the course of the method for producing such a cylinder head cover module, the camshaft is introduced into the hood body and in particular aligned and fixed in the hood body. In the opening of the hood body, the bearing element is pressed in such a way that the camshaft is rotatably mounted in the bearing element, in particular at one of its ends, and that the bearing element seals the opening of the hood body to the outside. The opening of the hood body serves, in particular, to be able to guide or precisely align the camshaft during the production process of the cylinder head cover module, for example by means of a so-called centering or guiding lance, as will be described in detail below. In conventional cylinder head cover modules, the opening, after the camshaft is aligned and fixed, closed, for example by means of a closure lid, which is merely inserted into the opening. The corresponding end of the camshaft is not stored, but hang freely in the air. In such conventional cylinder head cover modules, it is disadvantageous that the camshaft at this end can not withstand relatively large loads or bending loads. If the camshaft is to be exposed in such conventional cylinder head cover modules comparatively high forces or loads, another bearing is rotated in the hood or the last camp greatly extended, which possibly leads to an extension of the entire cylinder head cover module and an increase in weight and increased space requirements , Also can not be guaranteed by the insertion of a closure lid usually that the cylinder head cover module is tightly sealed or sealed to the outside.

In contrast, in a cylinder head cover module according to the invention improved properties and advantages can be achieved by structurally low-cost press-fitting of the bearing element in the manufacturing process. It can be ensured an improved bearing of the camshaft, whereby the camshaft can absorb more forces and be exposed to greater loads. At the same time a sealing of the cylinder head cover module is achieved to the outside. By this interference fit between the bearing element and the cylinder head cover module and the corresponding non-positive connection close these two elements tightly together, so that no liquids, especially oil and / or water, or foreign bodies can penetrate into the cylinder head cover module. Furthermore, this non-positive connection can not solve easily. Advantageously, the bearing element on a sliding bearing for rotatably supporting the camshaft. The interior of the bearing element is expediently turned out and adapted to the dimensions of the sliding bearing. Such a plain bearing is particularly suitable for the bearing of the camshaft, since the sliding friction and the corresponding sliding resistance can be kept low and generated heat can be effectively dissipated. In particular, by using a lubricating fluid, such as a suitable oil, the camshaft can be stored very effectively. Leakage of the lubricating fluid is prevented due to the oil-tight frictional connection with the cylinder head cover module.

Preferably, the bearing element has a connection for supplying the sliding bearing with such a lubricating fluid. The bearing element is in particular oriented in the course of the manufacturing process for this purpose or pressed aligned accordingly.

Preferably, the bearing element has a closure surface which terminates with the hood body. When the bearing element is pressed into the hood body, the opening is in particular closed by this closure surface, so that the hood body has a self-contained lateral surface. According to a particularly preferred embodiment, the bearing element is designed as a plain bearing block, wherein on one side of this plain bearing block an opening of the sliding bearing is arranged, in which the end of the camshaft is introduced. On the opposite side of this opening of the plain bearing block, in particular the closure surface, which closes with the hood body and this seals. In particular, the plain bearing and the closed surface are arranged with a certain distance from each other in the plain bearing block. The bearing element is preferably made at least partially of aluminum. Thus, the bearing element can be lightweight, compact, stable and inexpensive to build. The use of another appropriate material, such as plastic, is also conceivable.

According to an advantageous embodiment, the camshaft at one end or in the vicinity of the end of a pump cam. This pump cam is used in particular for actuating a fuel and / or injection pump. Such a fuel pump is in particular intended to convey fuel from a fuel tank to injection valves or the injection pump of the internal combustion engine. By means of such an injection pump, fuel is expediently conveyed under high pressure through the injection valves into the combustion chamber of the cylinder or the intake pipe. By arranging such a pump cam at the end of the camshaft, in particular a comparatively large bending load occurs, which can be effectively compensated by the bearing element. It is understood that other suitable components may be arranged at the end of the camshaft, e.g. a camshaft sensor wheel.

Advantageously, the camshaft is introduced into the hood body by a support shaft and to be connected to the support shaft components, in particular cams and pump cam and / or a Nockenwellengeberrad, are introduced into the hood body and connected together in the hood body. The camshaft is thus modular and the individual modular elements of the camshaft are assembled only in the course of the production process of the cylinder head cover module. The cylinder head cover module can thus be produced in a particularly simple and flexible manner. Advantageously, the support shaft of the camshaft is introduced in the course of the manufacturing process through the opening or through a second opposite opening in the hood body. In this second opening, for example, a further bearing, for example a sliding bearing, be arranged, through which the support shaft is introduced into the hood body. As already explained, the support shaft or the assembled camshaft can be guided through the opening and / or through the second opening, for example by means of a centering or guiding lance. Thus, the camshaft can be precisely guided through the opening or openings in the manufacturing process and after the fixation of the camshaft, the opening can be sealed tight by means of the bearing element.

According to a preferred embodiment, the cylinder head cover module is produced by means of the so-called Presta ² method developed by the applicant. A detailed description of such a method is disclosed for example in DE 10 2010 045 047 AI.

Preferably, the components to be connected to the support shaft are first arranged in the hood body. The components expediently have passage openings through which the support shaft can be guided. In particular, the components are arranged in the hood body such that their passage openings are aligned with the opening in the hood body. In particular, a guide or centering lance can be used for this purpose.

Advantageously, the support shaft is cooled, for example by means of liquid nitrogen. The hood body and the components to be connected to the support shaft are first heated. For example, the support shaft can be cooled to temperatures of up to -200 ° C, the components can be heated to temperatures of be heated to + 200 ° C and the hood body in particular to temperatures in the range between 45 ° C and 65 ° C. The support shaft thus contracts and its diameter is reduced. The components and the hood body expand in the course of this.

The cooled support shaft is preferably introduced into the heated hood body and thereby preferably passed through the passage openings in the heated components. In particular, the support shaft is inserted through the opening in the hood body or through the second opening. For example, the support shaft may be hollow in its interior and pushed over the centering lance. The cooled, contracted support shaft can be particularly easily in the extended hood body and lead through the extended components.

The support shaft is then preferably heated, the components and the hood body are preferably cooled. This heating or cooling can be done actively, but it can also be an automatic temperature compensation and wait until the support shaft, hood body and components have reached room temperature. The support shaft can then be precisely aligned in the hood body, in particular through the opening by means of centering lances, and also the components can be aligned relative to the support shaft. Subsequently, the components can be firmly connected to the support shaft, for example by the components are pressed onto the support shaft.

Preferably, the bearing element is then pressed into the opening in such a way that the camshaft is rotatably mounted in the bearing element and the bearing element seals the opening of the hood body to the outside. The bearing element may also be at another, earlier date of the Manufacturing process are pressed into the opening. For example, the bearing element can also be pressed into the opening at the beginning of the manufacturing process. Subsequently, the components are arranged in the hood body, hood body and components are heated. The support shaft is cooled, introduced through the second opening in the hood body and thereby guided through the through holes and into the bearing element. Subsequently, hood body and components are cooled, and the support shaft is heated.

Further advantages and embodiments of the invention will become apparent from the description and the accompanying drawings.

It is understood that the features mentioned above and those yet to be explained below can be used not only in the particular combination given, but also in other combinations or in isolation, without departing from the scope of the present invention.

The invention is illustrated schematically with reference to an embodiment in the drawing and will be described below with reference to the drawing.

figure description

Figure 1 shows schematically a conventional cylinder head cover module according to the prior art in a perspective sectional view.

Figure 2 shows schematically a preferred embodiment of a cylinder head cover module according to the invention in a perspective sectional view. FIG. 3 shows schematically a part of a preferred embodiment of a cylinder head cover module according to the invention in a perspective sectional view.

FIG. 4 shows schematically a part of a conventional one

Cylinder head cover module according to the prior art (Fig. 4a) and a part of a preferred embodiment of a cylinder head cover module according to the invention (Fig. 4b) each in a cross-sectional view.

In FIGS. 1 to 4 (b), identical reference numerals designate identical or identical elements and will not be explained separately.

In Figure 1, a conventional cylinder head cover module according to the prior art is shown schematically in a perspective sectional view and designated by 100 '. The cylinder head cover module 100 'is adapted to be arranged on a cylinder head of an internal combustion engine, for example of a motor vehicle.

The cylinder head cover module 100 'comprises a hood body 110, in which a first camshaft 210 and a second camshaft 220 are arranged. The camshafts 210 and 220 are rotatably mounted in bearings formed, for example, as slide bearings 120, which are arranged in the hood body 110.

The camshafts 210 and 220 each have a support shaft 211 and 221, respectively, to which a plurality of components are connected, namely cams 212 and 222 and a camshaft encoder wheel 213 and 223, respectively. At one end 215 the first camshaft 210, a pump cam 214 is arranged, which can drive an injection pump.

The hood body 110 has an opening 130 in an area near the end 215 of the first camshaft 210. Through this opening 130, the first camshaft 210 can be guided in the course of a manufacturing process of the cylinder head cover module 100 'relative to the hood body 110.

In such a conventional cylinder head cover module 100 ', a closure cover is inserted into this opening 130. Optionally, however, can not be ensured by means of such a closure lid that the cylinder head cover module 100 'is sealed and completely sealed.

In contrast, a preferred embodiment of a cylinder head cover module 100 according to the invention is shown schematically in a perspective sectional view in FIG. The hood body 110 of the cylinder head cover module 100 is shown only partially schematically for reasons of clarity.

As can be seen in FIG. 2, a bearing element 300 is arranged at the end 215 of the first camshaft 210. This bearing element 300 is pressed into the opening 130 of the hood body 110.

The bearing element 300 is preferably formed as a plain bearing block made of aluminum. In its interior, the bearing element 300 has a sliding bearing 310. The interior of the plain bearing block is turned out for this purpose and adapted to the dimensions of this plain bearing 310. The first camshaft 210 is at the end 215 rotatably mounted in the bearing element 300 and in the sliding bearing 310 of the bearing element 300.

Furthermore, the bearing element 300 or the corresponding plain bearing block has a closure surface 320. When the bearing element 300 is pressed into the opening 130 of the hood body 110, the opening 130 is closed by this closure surface 320 and the hood body 110 in particular has a self-contained lateral surface. The bearing element 300 and the closure surface 320 thus seal off the opening 130 of the hood body 110.

It is understood that for the second camshaft 220, a corresponding opening may be provided in the hood body and that also in this opening, a bearing element may be pressed analogously to the above description.

FIG. 3 schematically shows a part of the cylinder head cover module 100 from FIG. 2 in a perspective sectional view. FIG. 3 shows the first camshaft 210 with the support shaft 211 and the pump cam 214 arranged at the end 215. In this case, a connection 140 can be seen, via which the pump cam 214 can be connected to an injection pump. Furthermore, the bearing element 300 with slide bearing 310 and closure surface 320, which is pressed into the opening 130, is shown in FIG.

FIG. 4 a schematically shows a part of the conventional cylinder head cover module 100 'according to the prior art from FIG. 1 in a cross-sectional view. As can be seen, a closure lid 150 is inserted into the opening 130 of the hood body 110 of the conventional cylinder head cover module 100 '. The end 215 of the first camshaft 210 is not stored in this conventional case, but hang freely in the air. The first camshaft 210 can usually not comparatively large Withstand loads or forces. In particular, by the pump cam 214, however, it can lead to relatively high bending loads.

In FIG. 4b, a part of the preferred embodiment of the inventive cylinder head cover module 100 from FIG. 2 is shown schematically in a cross-sectional view. As can be seen, the end 215 is rotatably mounted in the sliding bearing 310 of the bearing member 300. The first camshaft 210 can thus withstand greater loads, in particular larger bending loads by the pump cam 214, than in the case of FIG. 4a.

LIST OF REFERENCE NUMBERS

100 'cylinder head cover module according to the prior art

100 cylinder head cover module according to a preferred embodiment of

invention

110 hood body

120 bearings, plain bearings

130 opening of the hood body

140 Connection to an injection pump

150 closure lid

210 first camshaft

211 support shaft

212 cams

213 Camshaft encoder wheel

214 pump cams

215 End of the first camshaft

220 second camshaft

221 support shaft

222 cams

223 Camshaft encoder wheel

300 bearing element

310 plain bearing

320 closure area

Claims

claims

A cylinder head cover module (100) for mounting on a cylinder head of an internal combustion engine, the cylinder head cover module (100) having a hood body (110) and a camshaft (210) disposed therein, and wherein the hood body (110) has an opening (130),

characterized in that

a bearing element (300) is pressed into the opening (130), wherein the camshaft (210) is rotatably mounted in the bearing element (300) and wherein the bearing element (300) seals the opening (130) of the hood body (110) to the outside.

2. Cylinder head cover module (100) according to claim 1, wherein the bearing element (300) has a sliding bearing (310) for rotatably supporting the camshaft (210).

3. Cylinder head cover module (100) according to claim 2, wherein the bearing element (300) has a connection for supplying the sliding bearing (310) with a lubricating fluid.

4. Cylinder head cover module (100) according to any one of the preceding claims, wherein the bearing element (300) has a closure surface (320) which terminates with the hood body (110), so that the hood body (110) has a self-contained lateral surface.

5. Cylinder head cover module (100) according to any one of the preceding claims, wherein the bearing element (300) is at least partially made of aluminum.

6. The cylinder head cover module (100) according to any one of the preceding claims, wherein the camshaft (210) at one end (215) has a pump cam (214).

7. A method for producing a cylinder head cover module (100) according to one of the preceding claims, wherein a camshaft (210) is introduced into a hood body (110),

characterized in that

in an opening (130) of the hood body (110) a bearing element (300) is pressed such that the camshaft (210) is rotatably mounted in the bearing element (300) and that the bearing element (300) the opening (130) of the hood body ( 110) seals to the outside.

8. The method of claim 7, wherein the camshaft (210) in the hood body (110) is introduced by a support shaft (211) and with the support shaft (211) to be connected components (212, 213, 214) in the hood body (110 ) are introduced and in the hood body (110) connected to each other to the camshaft (210).

9. The method of claim 8, wherein the support shaft (211) of the camshaft (210) through the opening (130) or through a second opening (130) opposite opening in the hood body (110) is introduced.

10. The method according to claim 8 or 9,

wherein the support shaft (211) is first cooled and wherein the components (212, 213, 214) to be connected to the support shaft (211) and the hood body (110) are first heated, wherein the cooled support shaft (211) is inserted into the heated hood body (110) while passing through through holes in the heated components (212, 213, 214),

wherein the support shaft (211) is heated and wherein the components (212, 213, 214) and the hood body (110) are cooled and

wherein the bearing element (300) is pressed into the opening (130) of the hood body (110) such that the camshaft (210) is rotatably mounted in the bearing element (300) and the bearing element (300) forms the opening (130) of the hood body (300). 110) seals to the outside.