COOLANT VALVE, COOLING SYSTEM AND MOTOR VEHICLE WITH A COOLING SYSTEM

Description

[0001] The present invention relates to a coolant valve for a cooling system of a motor vehicle according to the preamble of claim 1, a cooling system for a motor vehicle and a corresponding motor vehicle.

[0002] A coolant valve according to the preamble of claim 1 is known from document US 2021 / 164579 A1.

[0003] Such coolant valves for cooling systems, cooling systems, and motor vehicles equipped therewith are already known from the prior art in numerous design variants. The known coolant valves for cooling systems comprise a valve housing with a plurality of housing openings, each for the flow-conducting connection of a coolant line of the cooling system, at least one valve body rotatably arranged in the valve housing for the automatic flow-conducting connection of at least two of the housing openings depending on a rotational position of the at least one valve body, and at least one valve seal arranged between the valve housing and the at least one valve body for sealing the coolant valve.

[0004] Electric vehicles have the disadvantage, compared to vehicles with combustion engines, that distributing the heat generated by the engine places more complex demands on the vehicle's cooling system. While in a combustion engine, only the engine heat needs to be dissipated through a coolant circuit, which also requires only one coolant circuit if the engine heat is also used to heat the vehicle's interior, electric vehicles usually require several separate coolant circuits. On the one hand, excess engine heat must be dissipated, and on the other hand, a vehicle battery and the vehicle interior must be either cooled or heated, depending on the ambient temperature of the vehicle, to ensure optimal functioning of the electrically powered vehicle.Furthermore, the vehicle battery must be heated, for example, in the case of low ambient temperatures, even when there is no excess engine heat to dissipate, or when the vehicle has been started but an engine is not producing any, or at least not yet producing any significant, waste heat. Therefore, in addition to a cooling device for the coolant in a coolant circuit, a

[0005] A heating device is required to increase the coolant temperature when needed. In order to efficiently regulate the engine temperature, battery temperature, and interior temperature of a motor vehicle, several separate coolant circuits are usually required, unlike vehicles with combustion engines. These coolant circuits must be fed and regulated by cooling systems for multiple coolant circuits.

[0006] The known cooling systems for motor vehicles comprise a plurality of coolant circuits, having a coolant tank with an interior space which is designed to store a coolant, a plurality of coolant lines which are designed to introduce the coolant from the coolant tank into at least one coolant circuit, and tank electronics which are designed to control the respective cooling system.

[0007] An example of supplying and controlling multiple coolant circuits for an electric vehicle is disclosed in document WO 2017 223 232 A2. The document shows a coolant tank, for example for an electric vehicle, which has several components arranged inside it for creating multiple coolant circuits.

[0008] This is where the present invention comes in.

[0009] The present invention is based on the object of improving a coolant valve, a cooling system and a motor vehicle with a cooling system.

[0010] This object is achieved by a coolant valve having the features of claim 1, which is characterized in that the valve housing has a first housing cylinder having housing openings and a first valve body rotatable about a first axis of rotation, and a second housing cylinder having housing openings and a second valve body rotatable about a second axis of rotation, wherein the two axes of rotation are arranged parallel to one another and the first housing cylinder has a first housing plane with the first valve body and a second, valve body-free housing plane along the first axis of rotation, and wherein the second housing cylinder has at least one second housing plane with the second valve body along the second axis of rotation, and wherein the two housing cylinders are connected to one another in a flow-conducting manner only by means of the second housing planes.Furthermore, this object is achieved by a cooling system of a motor vehicle having the features of claim 8 and a motor vehicle having the features of claim 10. The subclaims relate to advantageous developments of the invention.

[0011] A key advantage of the invention is, in particular, that a coolant valve, a cooling system, and a motor vehicle with a cooling system are improved. Due to the inventive design of the coolant valve, the cooling system, and the motor vehicle, the space, material, manufacturing, and arrangement efficiency of the cooling system can be maximized. For example, the coolant valve according to the invention makes it possible to significantly reduce the number of components, the assembly and disassembly effort, the space required for the cooling system according to the invention, and ultimately also the costs and overall weight of the cooling system according to the invention. Furthermore, the coolant valve according to the invention makes it possible to implement very complex cooling systems, i.e., cooling systems with a large number of coolant lines and interconnection options for these coolant lines, in a simple manner in terms of design and production.The above-mentioned objectives, i.e. the realization of a complex cooling system on the one hand and the reduction of this cooling system in structural terms on the other hand, can be achieved simultaneously by means of the present invention, in contrast to the prior art.

[0012] In principle, the coolant valve can be freely selected within wide, suitable limits in terms of type, function, material, and dimensions. See, for example, the relevant comments in the introduction to the description, particularly with regard to electromobility. Accordingly, the valve seal can also be freely selected within wide, suitable limits, so that it can be designed, for example, as a separate seal or as an integral component of the respective valve body and / or valve housing.

[0013] An advantageous development of the coolant valve according to the invention provides that the first housing cylinder and / or the second housing cylinder, if the second housing cylinder has a first and a second housing level, each have / have a flow-conducting connection between the first housing level and the second housing level. In this way, the number of possible connections of different coolant lines using the coolant valve is further increased.

[0014] In principle, the first valve body and the second valve body can be freely selected in terms of type, function, material, dimensions, and shape within wide, suitable limits. It is advantageous for the first valve body and / or the second valve body to be cylindrical or spherical. The combination of housing cylinders on the one hand and cylindrical or spherical valve bodies on the other hand is particularly advantageous from a design and manufacturing perspective.

[0015] A further advantageous development of the coolant valve according to the invention provides that the first valve body, in a section perpendicular to the first axis of rotation, is at least partially designed as a profile that is open on one side, preferably that this profile of the first valve body is U-shaped. This makes the first valve body particularly suitable for use in the coolant valve according to the invention. This is because, for example, the number of possible connections of coolant lines using the coolant valve according to the invention is further increased in a structurally and manufacturing-technically simple manner, wherein a flow-conducting connection between the first and second housing levels of the first housing cylinder is also easily implemented. This applies particularly to the preferred embodiment of this development. The term "U-shaped" is to be interpreted broadly.

[0016] Another advantageous development of the coolant valve according to the invention provides that the second valve body, in a section perpendicular to the second axis of rotation, is designed as a circular ring segment, preferably that the circular ring segment extends between greater than or equal to 100° and less than or equal to 180° around the second axis of rotation. In this way, the second valve body is particularly simple to construct and manufacture. The preferred embodiment of this development also has the further advantage that, despite the aforementioned simplicity, a multitude of coolant line connections are possible by means of the second valve body.

[0017] A particularly advantageous development of the coolant valve according to the invention provides that the first valve body and the first housing cylinder and / or the second valve body and the second housing cylinder are each designed to be coordinated with one another in such a way that when the respective valve body is rotated for the purpose of transferring the coolant valve from a first valve state to a second valve state during the aforementioned rotation, the creation of a third valve state of the coolant valve with an undesired flow-conducting connection of a plurality of housing openings is prevented.As a result, during the transition of the coolant valve according to the invention from a first valve state with a desired connection of coolant lines to a second valve state with a desired connection of coolant lines, undesired connections of coolant lines are effectively prevented, thus preventing undesired coolant flows. Accordingly, the efficiency of the coolant valve according to the invention is significantly improved.

[0018] A further particularly advantageous development of the coolant valve according to the invention provides that the first valve body and the first housing cylinder and / or the second valve body and the second housing cylinder are each designed to be coordinated with one another in such a way that a degree of opening of at least one of the housing openings can be regulated as a function of the rotation of the respective valve body. In this way, not only is an adjustment between no coolant flow and a full coolant flow possible for this housing opening, but additionally, partial coolant flows can also be adjusted for this housing opening by means of the respective valve body. Accordingly, a coolant flow can be divided into different coolant lines as desired. This also includes circulating a partial flow of the coolant.

[0019] In principle, the cooling system according to the invention can be freely selected within wide, suitable limits in terms of type, mode of operation, material, dimensions, and arrangement. See, for example, the relevant explanations, particularly with regard to motor vehicles designed as electric vehicles.

[0020] A particularly advantageous development of the cooling system according to the invention provides that the at least one coolant valve is designed as a single coolant valve. This optimizes the cooling system according to the invention in terms of design and manufacturing technology, as well as in terms of installation space, cost, and weight, since all control tasks in the cooling system according to the invention can be performed using a single coolant valve according to the invention.

[0021] The invention is explained in more detail below using the attached, roughly schematic drawing. It shows: Fig. 1a-1c a first embodiment of the coolant valve according to the invention for the cooling system according to the invention of the motor vehicle according to the invention in three cross sections through the first housing plane (respective image plane above) and the second housing plane (respective image plane below), each in a plan view, Fig. 2a-2d the embodiment according to the Fig. 1a bis 1c in four further cross sections, in analog representation, Fig. 3a-3b the embodiment according to the Fig. 1a bis 2d in a first valve state, with the cooling system ( Fig. 3a ) and in analogous representation to the Fig. 1a bis 2d ( Fig. 3b ), Fig. 4a-4b the embodiment according to the Fig. 1a bis 2d in a second valve state, with the cooling system ( Fig. 4a ) and in analogous representation to the Fig. 1a bis 2d ( Fig. 4b ), Fig. 5a-5b the embodiment according to the Fig. 1a bis 2d in a third valve state, with the cooling system ( Fig. 5a ) and in analogous representation to the Fig. 1a bis 2d ( Fig. 5b ) and Fig. 6a-6d show a second embodiment of the coolant valve according to the invention for the cooling system according to the invention of the motor vehicle according to the invention in four cross sections through the first housing plane (image plane above) and the second housing plane (image plane below), each in a plan view.

[0022] In the Fig. 1a bis 5b A first embodiment of the coolant valve according to the invention for the cooling system according to the invention of the motor vehicle according to the invention is shown purely by way of example.

[0023] The motor vehicle, not shown in detail, is designed as an electric vehicle and has the only Fig. 3a , 4a and 5a cooling system 2 shown.

[0024] The cooling system 2 comprises only a single coolant valve 4 and a plurality of coolant lines 6 fluidly connected to the coolant valve 4, wherein at least two of the coolant lines 6 can be automatically fluidly connected to one another by means of the coolant valve 4. Further details of the cooling system 2 will not be explained in detail here and essentially correspond to the usual embodiments of cooling systems for electric vehicles. See also the relevant explanations in the introduction to the description.

[0025] The coolant valve 4 comprises a valve housing 8 with a plurality of housing openings A to G, each for the flow-conducting connection of one of the coolant lines 6 of the cooling system 2, a first and a second valve body 10, 12 rotatably arranged in the valve housing 8 for the automatic flow-conducting connection of at least two of the housing openings A to G depending on a rotational position of the two valve bodies 10, 12 and at least one valve seal (not shown) arranged between the valve housing 8 and the valve bodies 10, 12 for sealing the coolant valve 4.

[0026] The valve housing 8 has a first housing cylinder 14 having the housing openings A, B, E, F with the first valve body 10 rotatable about a first, not shown, rotation axis and a second housing cylinder 16 having the housing openings C, D, G with the second valve body 12 rotatable about a second, not shown, rotation axis, wherein the two rotation axes are arranged parallel to each other and the first housing cylinder 14 along the first rotation axis has a in the respective image plane of the Fig. 1a bis 1c , 2a bis 2d , 3b , 4b and 5b first housing level shown above with the first valve body 10 and one in the respective image plane of the Fig. 1a bis 1c , 2a bis 2d , 3b , 4b and 5bshown below, has a second, valve-body-free housing plane, and wherein the second housing cylinder 16 in the present first embodiment also has a second axis of rotation in the respective image plane of the Fig. 1a bis 1c , 2a bis 2d , 3b , 4b and 5b first housing level shown above and one in the respective image plane of the Fig. 1a bis 1c , 2a bis 2d , 3b , 4b and 5b has the second housing level shown below with the second valve body 12, and wherein the two housing cylinders 14, 16 are connected to one another in a flow-conducting manner only by means of the second housing levels.

[0027] Furthermore, the first housing cylinder 14 and the second housing cylinder 16 each have a flow-conducting connection between the first housing level and the second housing level. These flow-conducting connections are shown in the Fig. 1a bis 1c , 2a bis 2d , 3b ,4b and 5b , if visible in the respective valve state of the coolant valve 4 shown, symbolized by a circle with a cross.

[0028] The first valve body 10 and the second valve body 12 are cylindrical in the present embodiment, wherein the respective cylindrical shape refers to the shape enveloping the respective valve body 10, 12. In addition, the first valve body 10, in a Fig. 1a bis 1c , 2a bis 2d , 3b , 4b and 5b shown section perpendicular to the first axis of rotation, at least partially formed as a profile open on one side, wherein this profile of the first valve body 10 is U-shaped here. In contrast, the second valve body 12, in a Fig. 1a bis 1c , 2a bis 2d , 3b , 4b and 5bshown section perpendicular to the second axis of rotation, as a circular ring segment, wherein the circular ring segment in the present first embodiment extends substantially by 180° around the second axis of rotation.

[0029] Furthermore, the first valve body 10 and the first housing cylinder 14, as well as the second valve body 12 and the second housing cylinder 16, are each designed to be coordinated with one another in such a way that, upon rotation of the respective valve body 10, 12 for the purpose of transferring the coolant valve 4 from a first valve state to a second valve state, the aforementioned rotation prevents the establishment of a third valve state of the coolant valve 4 with an undesired flow-conducting connection between several of the housing openings A to G. This will be explained in more detail below.

[0030] The first valve body 10 and the first housing cylinder 14, as well as the second valve body 12 and the second housing cylinder 16, are each designed to be coordinated with one another in such a way that the degree of opening of at least one of the housing openings A to G can be regulated depending on the rotation of the respective valve body 10, 12. This will also be explained in more detail below.

[0031] In the following, the cooling system according to the invention of the motor vehicle according to the invention with the coolant valve according to the invention according to the present first embodiment is described with reference to the Fig. 1a bis 5b explained in more detail.

[0032] In the Fig. 1a bis 1c The coolant valve 4 is shown in three different valve states, wherein for the sake of simplicity, only the first valve body 10, shown at the top in the respective image plane and arranged in the first housing plane of the first housing cylinder 14, is rotated about the first axis of rotation perpendicular to the image plane. The second valve body 12, shown at the bottom in the respective image plane and arranged in the second housing plane of the second housing cylinder 16, is shown in the Fig. 1a bis 1c shown in a single example position. The solid arrows symbolize the coolant flows. For example, Fig. 1a It can be seen that in the illustrated valve state of the coolant valve 4, the housing openings A and E are connected to one another in a flow-conducting manner by means of the first valve body 10, while the housing openings C, D and G are connected to one another in a flow-conducting manner by means of the second valve body 12. As can be seen from the Fig. 1a As can also be seen, the coolant can flow into the coolant valve 4 through the housing opening C, then flow from the first housing level into the second housing level via the flow-conducting connection between the first and second housing levels of the second housing cylinder 16, and finally flow out of the coolant valve 4 through the housing opening G together with the coolant flowing into the coolant valve 4 through the housing opening D. The same applies to the other Fig. 1b und 1c shown valve states of the coolant valve 4.

[0033] As a result, for example, three different valve states of the coolant valve 4 can be set by means of the first valve body 10, namely firstly the flow-conducting connection between the housing opening A and the housing opening E, wherein the housing opening B is closed by means of the first valve body 10, secondly the flow-conducting connection between the housing opening B and the housing opening E, wherein the housing opening A is closed by means of the first valve body 10 and thirdly the flow-conducting connection between the housing opening B and the housing opening E and between the housing opening A and the housing opening F.

[0034] In the Fig. 2a bis 2d The coolant valve 4 is shown in four further different valve states. In contrast to the Fig. 1a bis 1c For the sake of simplicity, only the first valve body 10 shown at the top of the respective image plane and arranged in the first housing plane of the first housing cylinder 14 is shown in a single example position. The second valve body 12 shown at the bottom of the respective image plane and arranged in the second housing plane of the second housing cylinder 16 is shown in the Fig. 2a bis 2d rotated around the second axis of rotation perpendicular to the image plane. The solid arrows again symbolize the coolant flows. For example, Fig. 2a It can be seen that in the illustrated valve state of the coolant valve 4, the housing openings B and E as well as A and F are connected to one another in a flow-conducting manner by means of the first valve body 10, while the housing openings C, D and G are connected to one another in a flow-conducting manner by means of the second valve body 12. As can be seen from the Fig. 2a As can also be seen, the coolant can flow into the coolant valve 4 through the housing opening A, then flow from the first housing level into the second housing level via the flow-conducting connection between the first and second housing levels of the first housing cylinder 14, and finally flow out of the coolant valve 4 through the housing opening F. For the flow-conducting connection between the housing openings C, D and G, reference can be made to the relevant explanations in the previous paragraph. As with the Fig. 1a bis 1c Here too, the rest are in the Fig. 2b bis 2d The valve states of the coolant valve 4 shown can be read analogously.

[0035] As a result, by means of the second valve body 12, for example, four different valve states of the coolant valve 4 can be set, namely firstly the flow-conducting connection between the housing opening C and the housing opening G and between the housing opening D and the housing opening G, wherein the flow-conducting connection from the second housing cylinder 16 to the housing opening F is closed, secondly the flow-conducting connection between the housing opening C and the housing opening G, wherein the housing opening D and the flow-conducting connection from the second housing cylinder 16 to the housing opening F are closed by means of the second valve body 12, thirdly the flow-conducting connection between the housing opening C and the housing opening F,wherein the housing openings D and G are closed by means of the second valve body 12 and fourthly, the flow-conducting connection between the housing opening C and the housing opening F as well as between the housing opening D and the housing opening F, wherein the housing opening G is closed by means of the second valve body 12.

[0036] In the Fig. 3a bis 5b Three valve states of the coolant valve 4 are shown purely as examples, whereby the Fig. 3a , 4a and 5a the cooling system 2 with the coolant valve 4 and the Fig. 3b , 4b and 5b the coolant valve 4 in the corresponding valve state analogous to the Fig. 1a bis 1c and the Fig. 2a bis 2d show.

[0037] By means of the Fig. 3a und 3b In the illustrated first valve state of the coolant valve 4, two separate coolant circuits can be realized, represented by arrows with solid and dashed lines. In this valve state, the housing openings B and E as well as A and F are each connected to one another in a flow-conducting manner by means of the first valve body 10, and the housing openings C, D and G are each connected to one another in a flow-conducting manner by means of the second valve body 12. The flow-conducting connection between the aforementioned housing openings D and G is shown in the Fig. 3a by means of arrows with dotted lines, whereby the coolant flow of this flow-conducting connection is continuously adjustable by means of the second valve body 12 and the housing opening D. See also the above-mentioned Fig. 2a .

[0038] The Fig. 4a und 4b show a second valve state of the coolant valve 4, in which a first common coolant circuit can be realized. This is shown in the Fig. 4a represented by solid lines and includes the flow-conducting connections between the housing openings A and E as well as C and F. Furthermore, the flow-conducting connection of the housing openings D and F allows a controlled flow through a coolant circuit arranged parallel to the aforementioned common coolant circuit. This parallel coolant circuit is in the Fig. 4a symbolized by dotted lines.

[0039] Furthermore, the Fig. 5a und 5b a third valve state of the coolant valve 4, in which a second common coolant circuit can be realized. This is shown in the Fig. 4a also shown by solid lines and includes the flow-conducting connections between the housing openings B and E as well as C and F. In addition, the flow-conducting connection of the housing openings D and F again allows a controlled flow through a coolant circuit arranged parallel to the aforementioned common coolant circuit. This parallel coolant circuit is in the Fig. 5a symbolized by dotted lines.

[0040] In the Fig. 6a bis 6d A second embodiment of the coolant valve according to the invention is shown. The same or equivalent components are identified by the same reference numerals as in the first embodiment according to Fig. 1a bis 5b Furthermore, the second embodiment will be explained only to the extent of its differences from the first embodiment. Otherwise, reference is made to the above explanations regarding the first embodiment.

[0041] In the second embodiment according to the Fig. 6a bis 6d the second housing cylinder 16 has only the second housing plane, which is arranged parallel to the second housing plane of the first housing cylinder 14. Analogous to the first exemplary embodiment, the two second housing planes are also connected in a flow-conducting manner by means of a connecting channel. Accordingly, the housing openings C, D and G are all located in the second housing plane, the only housing plane of the second housing cylinder 16. Furthermore, the second valve body 12 is also designed as a circular ring segment in a section perpendicular to the second rotational axis, wherein the circular ring segment in the present second exemplary embodiment extends approximately 108° around the second rotational axis. Analogous to the first exemplary embodiment according to the Fig. 2a bis 2d is in the Fig. 6a bis 6d In the present second embodiment, the first valve body 10 is shown only in a single exemplary position. This exemplary position corresponds to the Fig. 2a bis 2d selected example position of the first valve body 10 in the first embodiment.

[0042] According to the present second exemplary embodiment, four different valve states of the coolant valve 4 can thus be set by means of the second valve body 12, namely firstly the flow-conducting connection between the housing opening C and the housing opening G and between the housing opening D and the housing opening G, wherein the flow-conducting connection of the second housing cylinder 16 to the housing opening F is closed by means of the second valve body 12, secondly the flow-conducting connection between the housing opening C and the housing opening G, wherein the housing opening D and the aforementioned flow-conducting connection to the housing opening F are closed by means of the second valve body 12, thirdly the flow-conducting connection between the housing opening C and the housing opening F,wherein the housing openings D and G are closed by means of the second valve body 12 and fourthly, the flow-conducting connection between the housing opening C and the housing opening F as well as between the housing opening D and the housing opening F, wherein the housing opening G is closed by means of the second valve body 12.

[0043] The invention is not limited to the present embodiments.

[0044] The described embodiments are intended only to provide a better understanding of the structure, operation and properties of the devices disclosed here.

[0045] Invention. The Fig. 1a bis 6d are schematic to illustrate the functions, operating principles, technical designs and features. Each function, principle, technical design and feature described in the Fig. 1a bis 6d or disclosed in the text, with all claims, each feature in the text and in the other figures, other modes of operation, principles, technical embodiments and features contained in this disclosure or resulting therefrom, may be freely and arbitrarily combined, so that all conceivable combinations can be assigned to the described invention. This also includes combinations between all individual statements in the text, i.e. in each section of the description, in the claims and also combinations between different variants in the text, in the claims and in the Fig. 1a bis 6d The claims also do not limit the disclosure and thus the possible combinations of all the features shown with each other. All disclosed features are also explicitly disclosed here individually and in combination with all other features. List of reference symbols

[0046] 2Cooling system 4Coolant valve 6Coolant lines 8Valve housing 10First valve body 12Second valve body 14First housing cylinder of valve housing 8 16Second housing cylinder of valve housing 8 A to GHousing openings of valve housing 8

Claims

1. A coolant valve (4) for a cooling system (2) of a motor vehicle, comprising a valve housing (8) with a plurality of housing openings (A to G), each for the flow-conducting connection of a coolant line (6) of the cooling system (2), at least one valve body (10, 12) rotatably arranged in the valve housing (8) for the automatic flow-conducting connection of at least two of the housing openings (A to G) depending on the rotational position of the at least one valve body (10, 12), and at least one valve seal arranged between the valve housing (8) and the at least one valve body (10, 12) for sealing the coolant valve (4), said valve housing (8) comprising a first housing cylinder (14) with housing openings (A, B, E, F) and a first valve body (10) rotatable about a first axis of rotation and a second housing cylinder (16) with housing openings (C, D, G) and a second valve body (12) rotatable about a second axis of rotation, said two axes of rotation being arranged parallel to one another, characterized in that the first housing cylinder (14) has along the first axis of rotation a first housing plane with the first valve body (10) and a second, valve-body-free housing plane, and in that the second housing cylinder (16) has along the second axis of rotation at least a second housing plane with the second valve body (12), and in that the two housing cylinders (14, 16) are connected to one another in a flow-conducting manner only by means of the second housing planes.

2. A coolant valve (4) according to claim 1, characterized in that the first housing cylinder (14) and / or the second housing cylinder (16), insofar the second housing cylinder has a first and a second housing plane, each have a flow-conducting connection between the first housing plane and the second housing plane.

3. A coolant valve (4) according to claim 1 or claim 2, characterized in that the first valve body (10) and / or the second valve body (12) is / are cylindrical or spherical in shape.

4. A coolant valve (4) according to one of claims 1 to 3, characterized in that the first valve body (10), in a section perpendicular to the first axis of rotation, is at least partially designed as a profile open on one side, preferably in that this profile of the first valve body (10) is U-shaped.

5. A coolant valve (4) according to one of claims 1 to 4, characterized in that the second valve body (12), in a section perpendicular to the second axis of rotation, is designed as an annular ring segment, preferably in that the annular ring segment extends between greater than or equal to 100° and less than or equal to 180° around the second axis of rotation.

6. A coolant valve (4) according to one of claims 1 to 5, characterized in that the first valve body (10) and the first housing cylinder (14) and / or the second valve body (12) and the second housing cylinder (16) are each designed to match one another in such a way that, when the respective valve body (10, 12) is rotated in order to switch the coolant valve (4) from a first valve state to a second valve state, the creation of a third valve state of the coolant valve (4) during the aforementioned rotation with an undesired flow-conducting connection of several housing openings (A to G) is prevented.

7. A coolant valve (4) according to one of claims 1 to 6, characterized in that the first valve body (10) and the first housing cylinder (14) and / or the second valve body (12) and the second housing cylinder (16) are each designed to be matched to one another in such a way that a degree of opening of at least one of the housing openings (D) can be regulated depending on the rotation of the respective valve body (12).

8. A cooling system (2) of a motor vehicle, comprising at least one coolant valve (4) and a plurality of coolant lines (6) connected in a flow-conducting manner to housing openings (A to G) of the coolant valve (4), in which at least two of the coolant lines (6) can be automatically connected to one another in a flow-conducting manner by means of the coolant valve (4), characterized in that at least one of the at least one coolant valve (4) is designed according to one of claims 1 to 7.

9. A cooling system (2) according to claim 8, characterized in that the at least one coolant valve (4) is designed as only a single coolant valve.

10. A motor vehicle with a cooling system (2), characterized in that the cooling system (2) is designed according to claims 8 or 9.