CN113227551A

CN113227551A - Method for installing a water pump on a motor vehicle and/or a drive train

Info

Publication number: CN113227551A
Application number: CN201980086324.2A
Authority: CN
Inventors: M·弗兰丁; D·勒克罗克
Original assignee: Renault SAS
Current assignee: Renault SAS
Priority date: 2018-12-27
Filing date: 2019-12-09
Publication date: 2021-08-06
Also published as: WO2020136000A1; FR3091255A1; FR3091255B1; EP3902987A1

Abstract

A method for installing an item of motor vehicle equipment, in particular an electric water pump (7), on a motor vehicle (1) and/or on a power system (2), is disclosed, characterized in that the method comprises: -a first step (E1) of providing a bracket (20), the bracket (20) comprising a collar (21) and a clamping screw (23) of the collar (21), the collar (21) comprising a first opening (30, 34) through which the clamping screw (23) is engaged; -a second step (E2) of fastening the bracket (20) to the frame (3, 11) of the motor vehicle (1) and/or of the power system (2); -a third step (E3) of inserting the item of motor vehicle equipment inside the collar; -a fourth step (E4) of tightening the clamping screw (23) so as to fix the item of motor vehicle equipment in position.

Description

Method for installing a water pump on a motor vehicle and/or a drive train

Technical Field

The invention relates to a method for mounting a water pump on a motor vehicle and/or a drive train by means of a bracket. The invention also relates to a bracket intended for fixing a water pump to a motor vehicle and/or to a power system. The invention further relates to a motor vehicle and a power system comprising such a bracket or being mounted using such a mounting method.

Background

Motor vehicles typically comprise a cooling system comprising a water or heat transfer liquid circuit and a pump adapted to circulate water or heat transfer liquid in the circuit. Such pumps are commonly referred to as water pumps, even though the heat transfer liquid is not strictly water. In operation, it is typically driven by a dispenser belt.

Motor vehicles increasingly include items of equipment or peripheral equipment that require cooling. Thus, the cooling circuit is longer and more complex. In order to circulate water or heat transfer liquid efficiently through such circuits, it is known to use a second or auxiliary water pump which supplements the main water pump. The auxiliary water pump is a standard equipment item produced in large scale nowadays.

To secure the auxiliary pump, the pump manufacturer typically carries a bracket that is secured to the pump. The water pump and its bracket are then secured against a frame of the vehicle, such as the engine block or body member. The bracket is specifically designed for the vehicle and/or powertrain to which it is intended to be secured. Thus, it has a geometry specific to a given powertrain or vehicle. The diversity of existing vehicles and power systems creates an equivalent diversity of water pumps equipped with their brackets. Therefore, assembly plants are faced with a complex management of the inventory of water pumps equipped with water pump racks.

In order to simplify the organization of inventory management and assembly plants, there are known water pump installation methods in which the manufacturer of the vehicle or power system orders, on the one hand, the bare water pump, i.e. the water pump without a bracket, and, on the other hand, the bracket suitable for the vehicle or power system to be assembled. The bracket is then mounted on the water pump at a specific mounting station and the assembly is then secured to the vehicle or power system. This facilitates the management of the water pump inventory, but on the other hand, the mounting tables used are bulky and complex to manufacture.

Disclosure of Invention

The object of the present invention is to provide a method of mounting a water pump and a bracket for carrying out the mounting method, which remedy the above-mentioned drawbacks and improve the known prior art mounting methods.

More precisely, a first object of the present invention is a method of installing a water pump that is easy to perform in an assembly plant, in particular a method of installing a water pump that enables simple management of the inventory of water pumps and does not require the use of specific assembly stations.

A second object of the invention is a water pump installation method that reduces or even eliminates the risk of incorrect installation of the water pump.

The invention relates to a method for installing an item of motor vehicle equipment, in particular an electric water pump, on a motor vehicle and/or on a drive train, comprising:

-a first step of providing a bracket comprising a collar and a clamping screw of the collar, the collar comprising a first opening through which the clamping screw engages;

-a second step of fixing the bracket to the frame of the motor vehicle and/or of the power system;

-a third step of inserting the item of motor vehicle equipment in the collar;

-a fourth step of tightening the clamping screw in order to fix the item of motor vehicle equipment in position.

The collar may comprise two half shells.

The collar may comprise a rotary hinge between the two half-shells, and a single clamping screw of the collar.

During the first, second and third steps, the first and second half-shells may be in a spread apart position.

In the unfolded position of the first half-shell and the second half-shell, the second half-shell may define a flare angle between 10 ° and 15 °, inclusive, in particular approximately equal to 12 °.

The first half shell may include the first opening and the second half shell may include a second opening, the clamping screw passing through the first opening and engaging through the second opening.

The bracket may comprise a fixing flange by means of which it is fixed, in particular screwed, to the frame of the motor vehicle and/or the power system during this step.

The stand may include error-proofing means to prevent the operator from mounting the item of motor vehicle equipment in an incorrect manner.

The item of motor vehicle equipment may comprise an electrical connector, and the collar may comprise a boss that covers the electrical connector at the end of the fourth step.

The invention also relates to a bracket intended to fix an item of motor vehicle equipment, in particular an electric water pump, to a motor vehicle and/or to a power system, comprising a fixing clip intended to be fixed to the motor vehicle and/or to the power system, a collar comprising two half-shells and a rotating hinge between the two half-shells, and a clamping screw of the collar, the collar comprising a free central opening intended to receive the item of motor vehicle equipment, the first half-shell comprising a first opening, the second half-shell comprising a second opening, the clamping screw being engaged in the first opening and in the second opening, the first half-shell and the second half-shell forming an opening angle strictly greater than zero, in particular an opening angle between 10 ° and 15 °, inclusive.

The collar may comprise a boss intended to cover an electrical connector of an item of motor vehicle equipment, in particular a water pump.

The invention also relates to an assembly comprising a frame of a motor vehicle and/or of a power system, and a bracket as defined above, which is fixed to the frame.

The invention also relates to a motor vehicle and/or a power system comprising at least one item of motor vehicle equipment, in particular an electric water pump or a mechanical water pump and an electric water pump, which is installed thanks to the installation method as defined above.

Drawings

These objects, features and advantages of the present invention will be described in detail in the following description of a particular embodiment thereof, given by way of non-limiting example with reference to the accompanying drawings, in which:

figure 1 is a schematic view of a motor vehicle according to an embodiment of the invention;

FIG. 2 is an isometric view of a water pump mounted on a bracket according to an embodiment of the invention;

figure 3 is an isometric view of the stand without the water pump;

figure 4 is a schematic diagram illustrating a second step of the method of installing a water pump according to one embodiment of the invention;

figure 5 is a schematic view illustrating a third step of the mounting method;

figure 6A is a first schematic view illustrating a fourth step of the mounting method;

fig. 6B is a second schematic view illustrating a fourth step of the mounting method;

figure 7A is a first schematic view showing the water pump mounted on the bracket at the end of the mounting method;

fig. 7B is a second schematic view showing the water pump mounted on the bracket at the end of the mounting method.

Detailed Description

Fig. 1 schematically illustrates a motor vehicle 1 equipped with a power system 2 according to an embodiment of the invention. The vehicle 1 may be of any kind. In particular, it may be, for example, a private car, a utility car, a truck or a bus. The power system 2 comprises an engine, in particular an internal combustion engine having an engine crankcase or engine block 3. The power system 2 also includes a cooling system 4. The cooling system 4 comprises a water or heat transfer liquid circuit 5, a first water pump 6 or main water pump, and a second water pump 7 or auxiliary water pump. Alternatively, the cooling system may include a single water pump or three or more water pumps. The cooling system may also advantageously comprise a heat exchanger able to cool the water or heat transfer fluid contained in the circuit 5.

The circuit 5 is a closed network of passages through various components of the power system that require cooling. Specifically, the circuit 5 may include a passage formed in the engine block 3. The water pumps 6, 7 are items of equipment of the power system which are able to circulate water or heat transfer fluid in the cooling circuit 5. Such a pump may also be referred to as a cooling pump. For circulating the water or heat transfer fluid, the water pumps 6, 7 may comprise, in particular, rotating blades adapted to drive the circulation of the water or heat transfer fluid in the circuit 5. Such a blade may have an overall cylindrical shell.

The water pump may be a so-called mechanical water pump, i.e. a water pump in which the blades are rotated via a mechanical drive. The mechanical water pump may in particular comprise a pulley mounted on a bearing, the pulley being driven in rotation from the engine by a belt. The water pump may also be a so-called electric water pump, i.e. a water pump in which the blades are rotated by an electric motor integrated into the water pump. Whether the water pump is mechanical or electrical, it may have an integral cylindrical housing. In fact, the pulley or the electric motor may have an overall shape with a rotation axis coinciding with the rotation axis of the blade. The axis of rotation corresponds to the axis of rotation of the blade.

According to the shown embodiment, the first water pump 6 is a mechanical water pump and the second water pump 7 is an electric water pump. Alternatively, the first water pump 6 may be an electric water pump, and the second water pump may be a mechanical water pump. Also, both water pumps may be electric water pumps.

The invention may be advantageously used for mounting electric water pumps, since such pumps are standard components requiring little or no adaptation for integration into a cooling system. The electric water pump 7 is shown in fig. 2. It therefore comprises an electric motor 8, an electrical connector 9 connected to the electric motor 8, a hydraulic inlet 12 and a hydraulic outlet 13. The hydraulic inlet 12 and the hydraulic outlet 13 are each composed of a hydraulic connector adapted to connect the water pump 8 to the circuit 5 on the upstream side and the downstream side. The hydraulic connector of the hydraulic inlet 12 may extend along an axis substantially aligned with the axis of rotation of the blade or electric motor. The hydraulic connector of the hydraulic outlet 13 may extend along an axis substantially perpendicular to the rotational axis of the blade or the electric motor. That is, the hydraulic connectors of the hydraulic outlets 13 extend radially with respect to the blade. The configuration of the water pump 7 is therefore compatible with centrifugal pumping of water or heat transfer fluid through the blades.

The first water pump 6 and the second water pump 7 are fixed to the engine block 3 and the vehicle body member 11 of the vehicle, respectively. In general, the water pump is fixed to a frame or a fixed structure of the vehicle. Alternatively, the two water pumps 6, 7 may be interchangeably fixed to the engine block or to the body member or to two separate body members. In the rest of the document, the term frame will be used to denote the element or structure to which the water pump 7 is fixed. The second water pump 7 is fixed to the frame by means of a special bracket 20. The first water pump 6 may also be fixed to the frame by means of brackets 20'. The stent 20' may be a stent according to the present invention, and even a stent identical to stent 20, or it may be any stent. The function of the bracket 20 is to maintain the water pump in a particular position throughout the life of the vehicle.

A bracket 20 capable of fixing the second water pump 7 will now be described with reference to fig. 2 and 3. In the remainder of the description, the second water pump will be more simply referred to as "water pump". In fig. 2 and 3, the bracket 20 is shown in a state before the water pump is fixed. The rack is shown in a state such as shipped by the rack manufacturer. The bracket 20 comprises a collar 21, a fixing flange 22 and a single clamping screw 23 of the collar 21. The collar 21 is a means of securing the water pump to the bracket 20. The securing flange 22 or securing lug is the means of securing the bracket 20 to the frame. The support is advantageously made of metal. In particular, the bracket may be pressed from a metal plate. The bracket 20 has sufficient rigidity to support the weight of the water pump under vehicle operating conditions. In particular, if the bracket is used to fix the water pump to the engine block 3, it will advantageously be designed to withstand vibrations of the order of a minimum of 160 Hz. If the bracket is used to fix the water pump to the body element 11, it will advantageously be designed to withstand vibrations of the order of a minimum of 30 Hz. The thickness of the metal plate used to make the bracket may be selected to achieve the appropriate stiffness.

The fixing flange 22 has a geometry matching the configuration of the vehicle in which the water pump is installed. It may comprise different, more or less plane parts inclined with respect to each other. The fixing flange also comprises two fixing

holes

38, 39, one of which is rectangular. These two

holes

39, 39 enable the bracket to be fixed to the frame. These

holes

38, 39 are intended to cooperate with a fixing screw 40 (visible in fig. 4) engaged in the frame. There may be any number of holes that enable the bracket 20 to be secured. Alternatively, the bracket 20 may be secured to the frame by other securing techniques, such as riveting, crimping or welding, for example.

The collar 21 comprises a central opening of overall circular shape. It is formed by two half-

shells

24, 25 and a swivel hinge 26 between the two half-

shells

24, 25. The two half-

shells

24, 25 are thus two elements separated from each other. The first half shell 24 and the fixing flange 22 form an integral assembly, i.e., a one-piece assembly. Broadly speaking, the two half-

shells

24, 25 take the form of a strip of substantially constant width extending along a semicircle. The two half-shells may have substantially the same shape. The shape of the

half shells

24, 25 is defined as the shape of the part supporting the water pump. In particular, the second half-shell 25 comprises a U-shaped boss 37. The bosses 37 cover the electrical connector 9 of the water pump when the water pump is placed in the bracket 20. The boss 37 makes it possible to bypass the electrical connector 9. The projection 37 enables an indexing, in particular a rotational indexing, of the pump on the collar 21, so that the pump can be easily mounted, in particular blindly mounted. Furthermore, once the pump has been mounted on the collar, the boss protects the electrical connector 9 from impacts, in particular from objects thrown by the movement of the vehicle. Alternatively, the two half-shells may be of any other shape.

The first half shell 24 has two ends 27, 28. The first end 27 comprises a hook 29 and the second end 28 comprises a first opening 30 through which the clamping screw 23 passes. Similarly, the second half-shell 25 has two ends 31, 32. The first end 31 comprises a hole 33 and the second end 32 comprises a second opening 34 through which the clamping screw 23 passes.

The rotating hinge 26 is obtained by the cooperation of the hook 29 with the hole 33. The second half-shell is thus able to pivot with respect to the first half-shell about an axis passing through the first end 27 of the first half-shell and coinciding with the first end 31 of the second half-shell. Which is oriented generally perpendicular to the surface formed by the central opening of the collar 21. Thus, the two

first openings

27, 31 are always in contact with each other and the two second ends can be moved away from each other thanks to the swivel hinge 26. It should be noted that the position of the hooks and the holes may be interchanged, i.e. the hooks may be on the second half-shell and the holes may be on the first half-shell. In particular, the opening angle a1 may be defined as the angle formed between a first straight section through the two ends 27, 28 and a second straight section through the two ends 31, 32.

While passing through the

openings

30 and 34, the clamping screw 23 fixes the swivel joint 26, so that the two

half shells

24, 25 form a fixed opening angle a 1. In the configuration shown in fig. 2-5, angle a1 may be between 10 ° and 15 °, inclusive, and in particular it may be about 12 °. Therefore, the two ends 28 and 32 of the first half-shell 24 and the second half-shell 25, respectively, do not contact each other. These two ends are intended to come into contact with each other when the clamping screw 23 is subsequently tightened. The flare angle a1 may be maintained at a particular value in various ways.

According to the embodiment shown, the two ends 28 and 32 are restricted from moving towards each other due to the particular configuration of the hook 29 and the aperture 33 tending to move the two ends 28 and 32 away from each other. In other words, the hook 29 and the hole 33 may be designed to generate a restoring force tending to open the angle a 1. This force can easily be overcome when subsequently tightening the clamping screw 23. According to a variant embodiment, said means for generating the action of moving the two ends 28 and 32 away from each other may be a compression spring (not shown) arranged around the clamping screw and interposed between the two ends 28 and 32 of the half-shells. Because the spring bears against each of the walls of the two ends 28 and 32, respectively, a force is exerted which moves the two half-shells away from each other to oppose the movement of the two half-

shells

24, 25 towards each other. Furthermore, the clamping screw 23 comprises, on the one hand, a screw head 35 supported on the end 32 and, on the other hand, a thread cooperating with a nut or a threaded opening formed at the level of the end 28. As is apparent from fig. 3, for example, end 28 may include, among other things, a nut 36 welded to end 28. The axis along which the clamping screw 23 extends is thus defined by the orientation of the threads of the nut 36. The opening 34 advantageously has an oblong shape so as to enable the second half-shell to pivot with respect to the first half-shell without the body of the screw interfering with the opening 34. Thus, in the absence of any external load, the two half-shells move away from each other under the effect of the restoring force until the screw head 35 abuts the end 32. It should be noted that the positions of the two

holes

30, 34 and the screws may be interchanged. The screw head may be supported on end 28 and nut 36 may be secured to end 32. The orientation of the clamping screw may be selected to facilitate access to the screw head for tightening the screw.

Alternatively, flare angle a1 may be maintained at a particular value by providing threads in each of

openings

30 and 34. The threads of both

openings

30 and 34 will then engage with the clamping screw. Upon tightening of the clamping screw, pivoting of the second half-shell relative to the first half-shell will result in a slight deformation of the half-shells.

According to another variant embodiment, the return force tending to open the opening angle a1 may be obtained in any other way. In particular, it can be obtained solely by the effect of the gravitational force exerted on the second half-shell 25.

According to another variant, the collar may consist of a single C-shaped element without the hinge movement means. The two ends of C will then have a design close to or identical to the two

end sections

28, 32 described above. The opening angle a1 will be maintained at a predetermined value by the inherent shape of the collar. When the collar is subsequently clamped, its two ends can be joined together thanks to the overall deformation of the collar.

In a complementary manner, the stand 20 may comprise error-proofing means to prevent the operator from mounting the water pump in the wrong manner. This error-proofing means can be obtained, for example, by a portion of the collar abutting one of the hydraulic connectors forming the hydraulic inlet 12 or the hydraulic outlet 13 of the water pump.

According to the present invention, the water pump is installed by the installation method which will now be described.

In a first step E1, a scaffold 20 as described above is provided. In particular, the clamping screw 23 is engaged in the nut 36 so that the opening angle a1 is fixed at a value between 10 ° and 15 °, inclusive, in particular so that the opening angle a1 is approximately equal to 12 °. The bracket is loose, that is to say not pre-mounted on the water pump. Thus, the central opening of the collar 21 is free, in other words, unimpeded.

In a second step E2 shown in fig. 4, bracket 20 is secured to a frame (not shown) of the vehicle and/or powertrain. For this purpose, the fixing screws 40 are screwed into the frame through the two fixing

holes

39, 39 of the fixing flange 22. The separate mounting bracket 20 is easier than pre-mounting it on the water pump because it is lighter to manipulate and the screws used to secure it to the frame are more accessible and/or easier to view. During this step, the clamping screw 23 is not manipulated and the opening angle a1 of the collar remains at the same value as during the first step E1. After the second step E2, a frame to which the bracket is fixed is thus obtained. The collar of the bracket includes a central opening that is unobstructed and ready to receive a water pump.

In a third step E3 shown in fig. 5, a water pump is provided and inserted or in other words into the central opening of the collar 21. An opening angle a1 (preferably 12 deg.) between 10 deg. and 15 deg., inclusive, enables a sufficiently large central opening to be obtained for easy insertion of the water pump into the collar. The error proofing means advantageously prevents the water pump from being inserted in an incorrect orientation. The bosses 37 advantageously provide a visual indication that the pump is properly oriented. The operator responsible for performing the mounting process can easily identify the electrical connector 9 on the water pump and pivot it so that its position coincides with the position of the boss 37. Once in place, the electrical connector 9 is protected from impact by the bosses 37 covering it. The bosses 37 also allow visual or mechanical inspection of the correct depth of insertion of the water pump into the collar 21.

In a fourth step E4 shown in fig. 6A and 6B, the clamp screw 23 is tightened to secure the water pump in place. The clamping screw 23 is screwed into the nut 36. The movement of the screw head 35 supported on the end 32 of the second half-shell 25 causes the second half-shell 25 to pivot about the rotary hinge 26. The end 32 of the second half-shell 25 moves towards the end 28 of the first half-shell 24 until the two half-shells effectively grip the body of the water pump. It should be noted that it is not necessary to provide the clamping screw 23 in a specific step, since the water pump is attached to the two half-shells. When the clamping screw 23 is engaged in the nut 36 it does not move and the operator can easily position the screw head 35 in order to screw it in. Furthermore, an opening angle a1 (preferably 12 °) between 10 ° and 15 ° (inclusive) enables a relatively short clamping stroke of the collar and thus a rapid clamping of the collar. The opening angle a1 is therefore the best compromise between easy insertion of the water pump into the central opening and quick clamping of the collar.

After the fourth step E4, the water pump is thus fixed to the frame by means of the bracket 20. It can be seen that the ends 28 and 32 of the two half shells are in contact one against the other. This therefore avoids the two half-shells clamping the water pump too strongly. Thus, the clamping torque of the clamping screw 23 may be high enough to prevent all risk of it loosening during use of the vehicle, but without risk of damaging the water pump due to over-clamping. To this end, the water pump may be connected to the circuit 5 via its hydraulic inlet 12 and its hydraulic outlet 13. The water pump may also be electrically connected to the electronic control unit via an electrical connector 9.

Thanks to this mounting method, the water pump is easily mounted on the frame of the vehicle. The water pump does not need to be pre-mounted on the bracket, which simplifies the management of the inventory of water pumps that may be common to different vehicles. The mounting method also does not require a mounting table on which the water pump is pre-mounted on the bracket. The water pump installation station is very simple, since it requires only an inventory of water pumps on the one hand and only an inventory of racks according to the invention on the other hand.

Claims

1. A method for installing an item of motor vehicle equipment, in particular an electric water pump (7), on a motor vehicle (1) and/or on a power system (2), characterized in that it comprises:

-a first step (E1) of providing a bracket (20), the bracket (20) comprising a collar (21) and a clamping screw (23) of the collar (21), the collar (21) comprising a first opening (30, 34) through which the clamping screw (23) is engaged;

-a second step (E2) of fixing the bracket (20) to the frame (3, 11) of the motor vehicle (1) and/or of the power system (2);

-a third step (E3) of inserting the item of motor vehicle equipment in the collar;

-a fourth step (E4) of tightening the clamping screw (23) so as to fix the item of motor vehicle equipment in position.

2. The mounting method according to the preceding claim, characterised in that the collar (21) comprises two half-shells (24, 25).

3. The mounting method according to the preceding claim, characterized in that the collar (21) comprises a rotating hinge (26) between the two half-shells (24, 25) and a single clamping screw (23) of the collar (21).

4. The mounting method according to the preceding claim, wherein during the first step (E1), the second step (E2) and the third step (E3), the first half-shell (24) and the second half-shell (25) are in a spread-apart position.

5. The mounting method according to the preceding claim, wherein, in the unfolded position of the first and second half-shells (24, 25), the second half-shell defines a flare angle (a1) of between 10 ° and 15 °, inclusive, in particular in that the flare angle is approximately equal to 12 °.

6. The mounting method as claimed in any of claims 2 to 5, characterized in that the first half-shell (24) comprises the first opening (30) and in that the second half-shell (25) comprises a second opening (34), the clamping screw (23) passing through the first opening (30) and engaging through the second opening (34).

7. The mounting method as claimed in any of the preceding claims, characterized in that the bracket (20) comprises a fixing flange (22), by means of which fixing flange (22) the bracket (20) is fixed, in particular screwed, to the frame (3, 11) of the motor vehicle (1) and/or of the power system (2) during the second step (E2).

8. Installation method according to any one of the preceding claims, characterized in that the bracket (20) comprises error-proofing means to prevent the operator from installing the item of motor vehicle equipment in an erroneous manner.

9. The mounting method according to any one of the preceding claims, wherein the item of motor vehicle equipment comprises an electrical connector (9), and wherein the collar may comprise a boss (37) that covers the electrical connector (9) at the end of the fourth step (E4).

10. A bracket (20) intended to fix an item of motor vehicle equipment, in particular an electric water pump (7), to a motor vehicle (1) and/or a power system (2), characterized in that it comprises a fixing clip (22) intended to be fixed to the motor vehicle (1) and/or the power system (2), a collar (21) and a clamping screw (23) of the collar (21), the collar (21) comprising two half-shells (24, 25) and a rotating hinge (26) between the two half-shells (24, 25), the collar (21) comprising a free central opening intended to receive the item of motor vehicle equipment, the first half-shell (24) comprising a first opening (30), the second half-shell (25) comprising a second opening (34), the clamping screw (23) being engaged in the first opening (30) and in the second opening (34), the first half-shell (34) and the second half-shell (25) form an opening angle (A1) strictly greater than zero, in particular an opening angle between 10 DEG and 15 DEG inclusive.

11. Cradle (20) according to the preceding claim, characterized in that the collar (21) comprises a boss (37) intended to cover the electrical connector (9) of an item of motor vehicle equipment, in particular a water pump (7).

12. An assembly comprising a frame (3, 11) of a motor vehicle (1) and/or a power system (2) and a bracket (20) according to any one of claims 10 and 11, the bracket (20) being fixed to the frame (3, 11).

13. A motor vehicle (1) and/or a power system (2), characterized in that the motor vehicle and/or the power system comprises at least one item of motor vehicle equipment, in particular an electric water pump (7) or a mechanical water pump (6) and an electric water pump (7), and in that the item of motor vehicle equipment is installed thanks to the installation method as claimed in any one of claims 1 to 9.