EP1774152A1

EP1774152A1 - Oil module with water pump and heat exchanger

Info

Publication number: EP1774152A1
Application number: EP05770011A
Authority: EP
Inventors: Roland Thiel; André KÜSTERS; Wilhelm Ardes
Original assignee: Ing Walter Hengst GmbH and Co KG; FEV Motorentechnik GmbH and Co KG
Current assignee: Ing Walter Hengst GmbH and Co KG; FEV Europe GmbH
Priority date: 2004-07-14
Filing date: 2005-07-12
Publication date: 2007-04-18
Also published as: DE202004011114U1; WO2006005328A1

Abstract

The invention relates to an oil module for an internal combustion engine, comprising an oil filter, an oil/water heat exchanger, said heat exchanger being embodied as a separate component with a joint surface connected to a corresponding joint surface on the oil module housing and a water pump, whereby the water pump has a rotational axis, such as the rotational axis for the rotor of a rotary pump and the joint surface of the heat exchanger is at a 90° angle to the rotational axis of the water pump, the heat exchanger being a closed oil/water heat exchanger.

Description

"Oil module with water pump and heat exchanger"

The invention relates to an oil module according to the preamble of claim 1. An¬.

An auxiliary equipment unit for a water-cooled internal combustion engine can be referred to as an oil module according to the proposal is known from DE 30 48 449 or from AT-PS 380 067, which relates to the same subject. The integration of the oil filter with a water pump and an oil / water heat exchanger leads to advantageously compact dimensions of the entire oil module compared to the arrangement of the three components as separate and separate components which are connected to the motor housing of the internal combustion engine would have to be.

In contrast to an oil module known from practice, in which the connection surface of the heat exchanger is oriented perpendicular to the axis of rotation of the water pump, the generic oil module uses a different angle. It is necessary for the coolant or cooling water, which in the context of the present proposal is referred to simply as "water", to be conducted from the water pump to the heat exchanger

From the standing perpendicular to the axis of rotation of the water pump connection surface of the heat exchanger to the pump housing of the water pump, is only possible in oil module known from practice, when an angled passageway is selected. The latter can not be produced singly, that is to say with only a single core tool, if the housing of the O1 module is designed as a cast component.

However, the zweizügige design of a flow channel causes on the one hand a flow unfavorable Kanal¬ course with undesirably large flow resistance and er¬ also requires possibly a considerable Nachbearbeitungsaufwand in the area where meet the two core tools or in the finished casting the angle zwi¬ between the two sections of the respective channel. In a particularly simple manner, the channel guide for the coolant from the water pump to the heat exchanger can take place when the connection surface of the heat exchanger is aligned parallel to the axis of rotation of the water pump.

But even with other, deviating from 90 ° orientations of the pad to the axis of rotation results in a gerad¬ linigen course of the mentioned coolant channel that this, starting from the pad after a certain distance the axis of rotation of the water pump must hit, the aforementioned route length all the more is shorter, the farther the angle deviates from 90 °, so that in a parallel An¬ order from pad to the axis of rotation optimally short design of the coolant channel and correspondingly compact dimensions of the entire oil module can be realized.

The object of the invention is to improve a generic oil module in such a way that it can be produced in an economical manner with particularly compact dimensions and with as few components as possible, as well as sealing surfaces. This object is achieved by an oil module with the features of claim 1.

The invention proposes in other words Stalten auszuge¬ the heat exchanger as a closed oil A / Vasser heat exchanger _r before, so both media oil and water respectively in geschlosse¬ NEN channels to lead. This results in several advantages:

■ This results in very small sealing surfaces for the connections of the heat exchanger to the housing of the oil module in comparison to an open heat exchanger, in which only one medium is guided in a closed channel and the other medium circulates freely in the housing. Therefore, smaller gaskets can be used which are cheaper and more reliable than longer, larger gaskets. In particular, it is possible to use circular seals because an adaptation of the sealing shape to a contour of the oil module housing is not required, but circular nozzles or bores can be provided. In the best case, three circular connection surfaces between oil module and heat exchanger can be provided, with corresponding circular seals: two connection surfaces for the outward and return flow of the oil, and a Anschlußflä¬ surface for the flow channel of the water to the housing of the internal combustion engine. A fourth connection can be designed as a hose connection, possibly as the only single hose connection of the oil module, and connect the oil module with a water cooler of the internal combustion engine.

Unlike in an open heat exchanger, in which the one, freely circulating medium passes directly to the seal of the other medium guided in the closed channel, the two media oil and water are safer in a closed heat exchanger. - A -

separates. Each of the two media is thus sealed only gegen¬ the environment, and not compared to the other medium, so that a higher reliability of the oil module and the entire internal combustion engine results.

■ While in practice the open heat exchangers are usually made of stainless steel sheets, aluminum can be used for a closed heat exchanger, which is advantageous in terms of price and weight.

■ Since the efficiency of a closed heat exchanger is significantly higher than that of an open heat exchanger, the same exchanger performance can be achieved with significantly smaller structural dimensions, so that the total dimensions of the oil module can advantageously be kept small.

The removal of the cooling water for the heat exchanger can preferably not take place from the main cooling water flow, which passes from the cooling water outlet of the water pump and is provided for cooling the internal combustion engine. Viel¬ more preferably at a distance in front of this Kühlwasser¬ outlet, that is, in the direction of rotation of the water pump in front of the cooling water outlet an outlet opening for cooling water vor¬ be seen, which is led to the heat exchanger of the oil module.

This removal of the cooling water upstream of the actual cooling water outlet has essentially two advantages:

■ First, the removal of the cooling water for the heat exchanger can be carried out at a location which provides sufficient pressure for the heat exchanger, wherein the path within the heat pump between the outlet opening and the ei¬ tual cooling water outlet allows a further pressure build-up of the cooling water, so that the Main stream of Cooling water, the pump at the cooling water outlet from the Wasser¬, can be made with an optimal pressure and also in the further course of the main coolant flow no pressure losses take place by the removal of coolant for the heat exchanger. In addition, the coolant channels for the main flow of the coolant can be carried out in a streamlined manner, namely without the required branch, in order to lead coolant to the heat exchanger.

■ The second advantage of the above-described removal of the cooling water at the outlet opening in front of the cooling water outlet is that the guidance of the channel from the water pump to the heat exchanger can be made structurally more free and not necessarily a channel from the cooling water main line Water inlet of the heat exchanger ge must be led. The channel guidance within the housing of the oil module for the various oil and water channels can therefore be equalized and simplified, which on the one hand has fluidic advantages for the media carried in these channels and, on the other hand, simplifies the production of the oil module, in particular its housing because, due to the simplified channel guidance, linear, single-pass channels can be used to a greater extent, so that the housing can be produced particularly economically as a cast part.

When the above-mentioned outlet opening is arranged in front of the cooling water outlet of the water pump, a retaining edge can advantageously be provided in the direction of rotation behind the outlet opening. In this way it is ensured that the cooling water is not within ^~ the water pump hin¬ via the outlet opening shooting off, but voltage due to the collecting edge in sufficient quantity and at the desired pressure through the Austrittsöff¬ emerges from the water pump and passes shear in the Wärmetau¬. If - as already mentioned - the housing of the oil module is designed as a casting, advantageously all channels and other cavities of the entire ver¬ running in the housing water channel can be produced one or zweizügig, so that a particularly simple, inexpensive and nachbearbei¬ tion low production this housing is possible. As a further advantage, a streamlined, low-resistance course of the water channel is also made possible.

Advantageously, it can be provided that all openings of the housing are completed with functional components. In the sense of the present proposal, a functional component is understood to be a component which can be used not only by the manufacturer of the oil module, but also by the vehicle manufacturer or in a workshop, and which insofar exceeds the mere closing function, namely that the corresponding housing opening In the context of the present proposal, examples of such multi-functional components include screw caps with which housing openings are closed and which, for example, initially fill the oil module with oil The same applies, for example, to screws which close off a fluid discharge opening, Further multifunctional components in the sense of the present proposal can be used as water rpumpe, be designed as a filter or as a heat exchanger. In the case of a cup-shaped housing of an oil filter integrated into the housing of the oil module, its opening can be closed, for example, by a filter cover, wherein an exchangeable filter insert is provided on the filter cover, which can be exchanged in the context of regular maintenance , In this respect, the housing closure, namely in this case the filter cover, serves as component carrier, this being the second function of this component in addition to the housing closure function. provides. In contrast to the closure of all Gehäuseöffnun¬ conditions by means of the proposed multi-functional components, it is known from the practice, by the manufacture of the housing er¬ required become housing openings with closure lids, which are needed only for the production of the housing and its sealing and no further Funk¬ tion have. As a result of the proposed omission of such monofunctional covers, the number of sealing surfaces on the housing can be reduced, and due to the higher integration density possible at the same time, a particularly compact design of the oil module with the smallest possible structural dimensions is possible.

The already described above removal of the cooling water flow, which is branched off for the heat exchanger, takes place in Nebenstrom to the main water cycle of the cooling water, which leads from Kühlerzüiπ motor housing and. The fact that the heat exchanger is advantageously arranged in the secondary flow to this main water circuit, a strömungsgüns¬ term cooling water is made possible in the main water circuit, since the heat exchanger is not arranged as in the main water circuit ein¬ built throttle.

Furthermore, the number of required sealing points can advantageously be reduced and thus the operational reliability of the oil module and of the entire internal combustion engine can be improved by dispensing as far as possible with hose lines. This not only because of the possibility that the hose is itself damaged, but in particular due to the consideration that the hose must be connected at its two ends to other components, so having two sealing points, while the direct connection of another component to a first component only requires a sealing surface. The already mentioned connection of multifunctional components to the housing of the oil module can in this sense reduce the otherwise required chen hose lines, so that the entire oil module vorzugswesie a single hose connection auf¬ has, namely for a hose leading to the radiator of the engine so that cooled cooling water can be fed into the oil module and, for example, from the water pump by the main pump Cooling water circuit of the Verbren¬ tion motor can be promoted and in a side stream through the oil cooler, which is designed as the above-mentioned oil-water heat exchanger.

Advantageously, within the oil module, a return line leading from the outlet opening of the heat exchanger to the water pump can be provided for the cooling water. Thus, no connections are required to the outside, and accordingly wer¬ the fewer components required and eliminates sealed connection points on the surface of the oil module in comparison to an externally guided return line for the cooling water.

Advantageously, for the cooling water, which is guided from the oil module to the crankcase of the internal combustion engine, an outlet opening can be provided within that connection surface with which the entire oil module is flanged to the combustion engine. Thus, this cooling water line can be connected directly to the internal combustion engine, namely waiving interposed Verbindungs¬ elements such. As hoses or nozzles, so that in this case, the number of required components and sealed connection points can be kept as low as possible.

Advantageously, a sensor for an oil pressure warning switch can be integrated into the oil module. As a result, the integration density of the oil module, which is usually manufactured by a supplier, is further increased, and the production of the internal combustion engine for the engine manufacturer is thereby simplified, since the internal combustion engine itself has its own connection to the engine Assembly of such a sensor can be dispensed with.

Advantageously, the oil module can have an additional outlet for cooling water to be led to a transmission oil cooler, so that reliable maintenance of specific operating temperatures is made possible not only for the internal combustion engine itself but also for an associated transmission and as far as possible components and sealing points are required. In this case, this additional outlet of the oil module can advantageously form the first mouth of an additional cooling water channel, which runs from the water pump to this additional outlet. This cooling water channel can have its other mouth at the circumference of the housing of the water pump and connect there in a manner similar to the cooling water channel leading to the heat exchanger or similar to the cooling water channel possibly provided parallel to it, leading to the crankcase of the combustion engine.

An embodiment of the invention will be explained in more detail below with reference to the drawings. The show

Fig. 1 - 4, an oil module from different views, Fig. 5 is a section through the oil module along the line

A - A of Fig. 4, and Fig. 6 is a perspective view of the oil module, with the heat exchanger removed.

In the drawings, 1 as a whole an oil module gekenn¬ characterized having a central housing 2. The Ge housing 2 includes a plurality of channels for guiding the lubricating oil and cooling water of an internal combustion engine ^"and is an apparent from Fig. 1 pad 3 to a motor housing an¬ closed. Within this pad 3 is a Ein¬ outlet opening 4 is provided for unfiltered oil , an outlet opening 5 for filtered pure oil, an outlet opening 6 for cooling water, which from the pressure side of a water pump in enters the coolant circuit, and an outlet opening 7 for the so-called "oil drain" through which outlet oil can flow back into the crankcase of the engine when the oil filter of the engine is changed and in the course of Filter¬ change the oil filter housing runs empty.

This aforementioned oil filter is marked 8 in the drawings. It has a housing as a filter cup 9, which is part of the housing 2 and ver¬ by means of a screw cap 10 is closed.

Furthermore, the housing 2 has a connection 11 as inlet opening for the cooling water of the internal combustion engine.

On the side of the housing 2, which is opposite the motor-side connection surface 3, a connection surface 12 is provided, on which an oil / water heat exchanger 14 adjoins the housing 2. The heat exchanger 14 is provided with a mounting plate 15, which circulates around the housing of the heat exchanger 14 and serves to receive fastening screws, by means of which the heat exchanger 14 is connected to the housing 2.

On the side of the housing 2 opposite the connection 11, a water pump is provided. FIGS. 1-3 show a drive wheel 16, which is driven by a V-belt and drives an impeller of the water pump via an axle. This drive axle extends from the drive wheel 16 through an axle housing 17, which is connected to the central housing 2 of the oil module 1 by a plurality of fastening screws and which seals the cavity which is provided in the housing 2 for receiving the impeller of the water pump.

The axis of rotation of the drive wheel 16, the drive shaft running in the axle housing 17 and the impeller of the water It can therefore, as in particular from Fig. 2 ersicht¬ Lich, a short connection between the water pump and the heat exchanger 14 are provided, so that apart from this short connection a considerable amount of space in housing 2 is available to guide the other oil and wasserfüh¬ render channels. Because of this free space, it is possible to design all the cavities provided in the interior of the housing 2, be it flow channels or hollow spaces, for receiving the impeller of the water pump, for example. Thus, a dement¬ speaking inexpensive production of the housing 2 is possible.

In Fig. 4 is a view is shown on the front face of the oil module 1, which is opposite to the one shown in Fig. 3 back of the oil module 1. In the illustration in Fig. 4, the Aehsgehäuse-17 is removed together with the drive wheel 16 and a housing 18 for a water pump can be seen, which is not made as an actual own housing, but which le¬ diglich forms part of the entire housing 2. Within the water pump housing 18, a receiving space 19 for the impeller of the water pump can be seen, around this receiving space 19 a helical cooling water channel 20 can be seen. The cooling water channel 20 initially leads to an outlet opening 21 for the cooling water, from which a certain proportion of the cooling water reaches the heat exchanger 14. In the further course, the cooling water channel 20 leads the cooling water to a cooling water outlet 22. So that the cooling water does not shoot over the outlet opening and passes directly to the cooling water outlet, a flow direction behind the outlet opening is apparent, in particular also from FIG Suspended edge 23 is provided.

In the oil module 1, a sensor for an oil pressure warning switch 24 is integrated. For applications in which the internal combustion engine interacts with a transmission and a transmission oil cooler is provided, an additional outlet 25 is provided vorge, can be guided by the cooling water from the oil module 1 to the Getriebe¬ oil cooler in the applications. In the applications in which a transmission oil cooler is not vor¬ seen, can - as shown in the drawings - the additional outlet 25 are closed with a screw plug.

From the perspective view of FIG. 6, which shows the oil module 1 with the heat exchanger 14 removed, a return line 26 for the cooling water in the interior of the oil module 1 is visible, which leads from the outlet opening of the heat exchanger 14 to the water pump.

Claims

claims:

1. Oil module for an internal combustion engine, having an oil filter, an oil / water heat exchanger, wherein the heat exchanger is designed as a separate component and with a connection surface adjoins a corresponding connection surface of the oil module housing, and with a water pump, wherein the water pump has an axis of rotation - such as the axis of rotation for the impeller of an impeller pump, and the connection surface of the heat exchanger is oriented at an angle deviating from 90 ° to the axis of rotation of the water pump, characterized in that the heat exchanger (14) as a closed oil / Water heat exchanger is designed.

2. Oil module according to claim 1, characterized in that the connection surface (12) is designed aus¬ parallel to the axis of rotation.

3. Oil module according to claim 1 or 2, characterized in that on the circumference of a Gehäu¬ ses (18) of the water pump, an outlet opening (21) is provided for cooling water, from which the cooling water to the water inlet of the heat exchanger (14) is guided, in Direction of rotation of the water pump behind the outlet opening (21) of the cooling water outlet (22) is provided, to which the cooling circuit for engine cooling an¬ closes.

4. Oil module according to claim 3, characterized by a in the direction of rotation behind the outlet opening (21) vorge¬ provided retaining edge (23).

5. Oil module according to one of the preceding claims, characterized by a designed as a cast housing (2), wherein all the cavities of the entire in the housing (2) extending water channel are one or two produced.

6. Oil module according to one of the preceding claims, characterized by a designed as a cast housing (2), wherein all the housing (2) vorgesehe¬ NEN openings are closed with so-called multi-functional components, each in addition to the functi¬ on, the respective opening in To close housing (2), at least have a second function - as water serpumpe, filter, heat exchanger or component carrier.

7. Oil module according to one of the preceding claims, characterized in that the heat exchanger (14) is arranged in the secondary flow to the water cycle.

8. Oil module according to one of the preceding claims, characterized in that except for a hose leading to a cooler of the internal combustion engine, the oil module is free of hose lines and Schlauchlei¬ device connections.

9. Oil module according to one of the preceding claims, characterized in that within the oil module from the outlet opening of the heat exchanger (14) leading to the water pump return line (26) is provided for the Kühlwas¬ water.

10. Oil module according to one of the preceding claims, characterized in that an outlet opening for the guided from the oil module (1) to the crankcase of the internal combustion engine cooling water within a connection surface (3) is arranged, by means of which Oil module (1) directly - waiving interposed switched connection elements such as nozzles - with the internal combustion engine is connectable.

11. Oil module according to one of the preceding claims, characterized by a in the oil module (1) integrier¬ th sensor for an oil pressure warning switch (24).

12. Oil module according to one of the preceding claims, characterized in that the oil module (1) has a zu¬ additional outlet (25) for leading to a transmission oil cooler cooling water.

13. Oil module according to claim 12, characterized in that the additional outlet of the oil module (1) forms the ^" first mouth ^{" of} an additional cooling water channel whose other mouth is provided at the circumference of a housing (18) of the water pump.