Damping arrangement for an axle of a motor vehicle and motor vehicle

Abstract

Damping arrangement (10) of an active suspension for an axle of a motor vehicle, wherein a damping system (10a, 10b) interacts with each wheel of the axle, wherein each of the damping systems (10a, 10b) comprises the following assemblies: a damper (11) comprising a double-acting hydraulic cylinder (12) and a piston (13), wherein the damper (11) can be coupled to a wheel suspension system of the respective wheel, a hydraulic pump (16) and an electric motor (17) for driving the respective hydraulic pump (16), wherein the hydraulic pump (16) can be driven in different directions of rotation by the electric motor (17) to provide different delivery directions, a hydraulic unit (19) comprising a hydraulic reservoir (20) and valves (21, 22, 23, 24), wherein the hydraulic pump (16) and the hydraulic unit (19) of the respective damping system (10a, 10b) interact with hydraulic chambers (14, 15) of the hydraulic cylinder (12) of the respective damping system (10a, 10b) in such a way that, depending on the delivery direction of the hydraulic pump (16) of the hydraulic unit (19), a movement of the piston (13) in a first actuation direction or in a second actuation direction can be provided, wherein the hydraulic pumps (16) and the electric motors (17) of both damping systems (10a, 10b) are combined to form a motor-pump unit (28), characterized in that The motor-pump unit (28) is attached to an axle carrier (41) of the axle on both sides of the same by at least two bearings (29) each, which are each received in a common bearing support (30), wherein a first bearing support (30) is integrated into a first housing cover (31) of a housing (32) of the motor-pump unit (28), and wherein a second bearing support (30) is connected to a second housing cover (35) of the housing (32) of the motor-pump unit (28) via a tie rod (33) and a bearing tube (34).

Description

[0001] The invention relates to a damping arrangement of an active chassis of a motor vehicle for an axle of the motor vehicle and a motor vehicle.

[0002] DE 10 2017 117 658 B4 and DE 10 2019 115 492 B4 each disclose a damping system for a wheel of a motor vehicle, comprising a damper, a hydraulic pump driven by an electric motor, a hydraulic reservoir, and several valves. The damper consists of a double-acting hydraulic cylinder and a piston that moves back and forth within it. The hydraulic pump is coupled to hydraulic chambers of the hydraulic piston via hydraulic lines, whereby, depending on the delivery direction of the hydraulic pump, movement of the piston in a first actuation direction or in a second actuation direction is possible.

[0003] An axle of a motor vehicle comprises two wheels that are connected via corresponding wheel suspensions to an axle carrier, which can be designed as a subframe or a subframe. A subframe connects to the vehicle body via bearings, decoupled from the axle. A subframe connects to the vehicle body without decoupling. In an active suspension system, each wheel on an axle has its own damping system. The two damping systems for the two wheels of an axle are part of the damping assembly for that axle of the motor vehicle.

[0004] From DE 10 2019 118 384 A1, it is known that the electric motor and the hydraulic pump of a damping system for each wheel of an axle of an active suspension are combined into a motor-pump unit. A common electronic unit interacts with both motor-pump units of each axle. The electronic unit is installed between the two motor-pump units. The two motor-pump units form a motor-pump unit, which is mounted to the vehicle via mounting points. The electronic unit is an integral part of the motor-pump unit.

[0005] WO 2017 / 000990 A1 discloses an electric coolant pump for a motor vehicle with a pump housing, wherein the pump housing is fixed to a vehicle structure via a mounting structure. The mounting structure is arranged on the pump side exclusively on a flow housing part of the pump housing.

[0006] DE 10 2018 122 226 A1 discloses a subframe for receiving a motor-pump unit for active hydraulic dampers on a subframe of a motor vehicle, wherein the subframe has a first end face, a second end face and a rear face, wherein the first end face is arranged substantially orthogonal to the rear face and parallel to the second end face, and wherein the first end face has a passage for passing hydraulic connections.

[0007] DE 10 2018 118 785 A1 discloses a further subframe for a motor vehicle, comprising fastening means for active wheel suspensions, a frame structure and a pumping device, wherein the fastening means are connected to each other via the frame structure.

[0008] DE 10 2018 209 467 A1 discloses a load-bearing vehicle frame component comprising a main section, at least one fastening section formed on the main section, and at least one non-load-bearing functional component which is attached to the fastening section by means of at least one connecting device.

[0009] DE 43 17 467 A1 discloses a vibration-damping arrangement of a hydraulic unit of a slip-controlled braking system. For structure-borne noise isolation of the hydraulic unit, it is elastically supported below its center of gravity on three rubber spring elements on the vehicle.

[0010] In practice, it has been shown that the motor-pump unit of a damping system on one axle of an active suspension system vibrates considerably during driving, particularly due to vibrations from the road surface. This is a disadvantage.

[0011] Therefore, a damping arrangement is needed for one axle of an active suspension system in a motor vehicle, which limits the vibration amplitudes of the motor-pump unit. It is also necessary to limit vibration excitations or pulsations caused by the motor-pump unit itself to the vehicle body via the axle carrier.

[0012] The object of the invention is to provide a damping arrangement for an axle of an active suspension system of a motor vehicle, in which the motor-pump unit vibrates less during driving when simply connected to an axle carrier of the motor vehicle. Furthermore, a motor vehicle with such a damping arrangement is to be provided.

[0013] This problem is solved by a damping arrangement according to claim 1 and by a motor vehicle according to claim 10.

[0014] In the damping arrangement according to the invention, the motor-pump unit is attached to an axle carrier of the axle of the motor vehicle on both sides of the same via at least two bearings, each of which is received in a common bearing support.

[0015] A first bearing support is integrated into a first housing cover of a motor-pump unit housing, while a second bearing support is connected to a second housing cover of the motor-pump unit housing via a bearing tube and a tie rod.

[0016] The motor-pump unit of the damping arrangement can be easily attached to an axle carrier of the motor vehicle; furthermore, the motor-pump unit tends to vibrate less during driving and transmits its own vibrations to the body in a damped manner.

[0017] Preferably, the respective bearing support is designed in a spectacle-like shape, such that it has a monolithic base body with two adjacent recesses for receiving an elastic bearing each. This design of the bearing support allows for easy connection of the motor-pump unit to the axle carrier. Furthermore, the bearings reduce the tendency of the motor-pump unit to vibrate while the vehicle is in motion.

[0018] Preferably, the base body of the first bearing support is integrated into the first housing cover of the motor-pump unit housing, while the base body of the second bearing support is connected to the second housing cover of the housing via the bearing tube under compressive load. The base body of the second bearing support and the second housing cover are arranged opposite each other on the bearing tube and connected to each other via the tie rod under tensile load. This design is particularly preferred for reducing the motor-pump unit's tendency to vibrate while ensuring a simple connection to the axle carrier.

[0019] Preferably, each bearing has a central recess through which a bushing and a screw can extend to fasten the bearing to the axle carrier, the bushing accommodating a clip for guiding cables and / or hoses to the bearing. This is preferred for securing cables and / or hoses to the motor-pump unit in a defined and vibration-isolated manner, and thus guiding them to the damping arrangement.

[0020] Preferably, the bearing tube and the tie rod and / or the motor-pump unit extend into the installation space for the stabilizer instead of a stabilizer and are attached via the respective bearing support, preferably to connection points on the axle carrier for the stabilizer. This allows the motor-pump unit, together with the bearing tube and tie rod, to be advantageously integrated into a motor vehicle with minimal installation space requirements.

[0021] Preferred embodiments of the invention are set forth in the dependent claims and the following description. Exemplary embodiments of the invention are explained in more detail with reference to the drawing, without being limited thereto. The drawing shows: Fig. 1 a schematic representation of hydraulic assemblies of a damping arrangement according to the invention for the wheels of an axle of an active chassis of a motor vehicle according to the invention; Fig. 2 a section of a damping arrangement according to the invention in the area of ​​a motor-pump unit, a bearing tube and bearings in a first perspective view; Fig. 3 the section of the Fig. 2 in a second perspective view; Fig. 4 a detail of the section of the Fig. 2 and Fig. 3 in the area of ​​a first end of the motor-pump unit; Fig. 5 another detail of the section of the Fig. 2 and Fig. 3 in the area of ​​a second end of the motor-pump unit; Fig. 6 the detail of the Fig. 5 together with a tie rod; Fig. 7 the detail of the Fig. 6 together with the bearing tube; Fig. 8 a section of a motor vehicle in the area of ​​a first end of an axle carrier and a first end of the damping arrangement mounted on the axle carrier; Fig. 9 a section of a motor vehicle in the area of ​​a second end of the axle carrier and a second end of the damping arrangement mounted on the axle carrier; Fig. 10 the section of the Fig. 8 in a perspective view in partial exploded view Fig. 11 the section of the Fig. 8, Fig. 10 in another view; Fig. 12 the section of the Fig. 11 together with clips and cables; Fig. 13 a further section of the damping arrangement according to the invention in the area of ​​the second end in a first perspective view; Fig. 14 the section of the Fig. 13 in a second perspective view.

[0022] A motor vehicle, such as a passenger car, has several axles. Each axle has two wheels, which typically attach to an axle carrier, in particular a subframe, of the respective axle via corresponding wheel suspensions. The subframe of the respective axle is decoupled from the body of the motor vehicle via bearings. The wheel suspensions can also attach to an axle carrier designed as a subframe, which is not decoupled from the body of the motor vehicle. Subframes are preferably used in the area of ​​a rear axle and subframes preferably in the area of ​​a front axle. If the respective axle of the motor vehicle is the axle of an active suspension system of the motor vehicle, a damping arrangement 10 is provided for the two wheels of the axle of the active suspension system, wherein Fig. Figure 1 shows a preferred embodiment of a damping arrangement 10 for the two wheels of an axle of an active chassis of a motor vehicle.

[0023] The damping arrangement 10 of an axle of the active suspension has a damping system 10a, 10b for each wheel of the axle. Each of the damping systems 10a, 10b has a damper 11, which can be coupled to a wheel suspension system (not shown) for the respective wheel (not shown). The respective damper 11 is formed by a double-acting hydraulic cylinder 12 and a piston 13, wherein the piston 13 is movable back and forth within the hydraulic cylinder 12. Fig. 1. Up and down. The hydraulic cylinder 12, designed as a double-acting hydraulic cylinder, of each of the damping systems 10a, 10b has a hydraulic chamber 14, 15 on each side of the piston 13. Depending on which of the two hydraulic chambers 14, 15 is supplied with hydraulic oil and from which of the two hydraulic chambers 15, 14 hydraulic oil is discharged, the piston 13 can be displaced either in a first actuation direction or in an opposite second actuation direction. The first actuation direction of the piston 13 is actuation in the tension direction and the second actuation direction of the piston 13 is actuation in the compression direction.

[0024] Each damping system 10a, 10b also includes a hydraulic pump 16, which can be driven by a respective electric motor 17. The hydraulic pump 16 and the electric motor 17 of each damping system 10a, 10b form a respective motor-pump unit 18. The hydraulic pump 16 is a reversible pump, which can be driven in different directions of rotation by the respective electric motor 17 to provide different delivery directions.

[0025] The respective damping system 10a, 10b of the Fig. The hydraulic unit 1 also includes a hydraulic unit 19, which comprises a hydraulic reservoir 20 and valves 21, 22, 23, and 24. Valves 21 and 22 are check valves, and valves 23 and 24 are damping valves. The hydraulic reservoir 20 of each of the damping systems 10a and 10b connects to hydraulic lines of the hydraulic unit 19, which are coupled to hydraulic chambers 14 and 15, between the check valves 21 and 22 and between the damping valves 23 and 24.

[0026] Depending on the delivery direction of the hydraulic pump 16 and preferably also depending on the position of the valves 21, 22, 23, 24 of the respective damping system, oil is supplied to the hydraulic chamber 14 and oil is discharged from the hydraulic chamber 15 to displace the piston 13 in the first direction of movement, i.e. in the direction of tension, or oil is supplied to the hydraulic chamber 15 and oil is discharged from the hydraulic chamber 14 to provide a second direction of movement of the piston 13 in the second direction of movement, i.e. in the direction of compression.

[0027] The hydraulic pump 16 of the motor-pump group 18 of the respective damping system 10a, 10b is connected to the hydraulic unit 19 of the respective damping system 10a, 10b, comprising the hydraulic reservoir 20 and the valves 21, 22, 23, 24, which is preferably installed as a unit on the damper 11 or on the hydraulic cylinder 12, via hydraulic lines 25, 26.

[0028] The motor-pump groups 18 of the two damping systems 10a, 10b of the damping arrangement 10 of the axle of the active suspension are controlled by a common control unit 27. The electric motors 17 of the two motor-pump assemblies 18 can be controlled by the common control unit 27.

[0029] The two motor-pump groups 18 of the two damping systems 10a, 10b and the common control device 27 form a motor-pump unit 28 of the damping arrangement 10.

[0030] The present invention relates to details of the damping arrangement 10 which ensure that the motor-pump unit 28 of the damping arrangement 10 of the axle of the active suspension of the motor vehicle vibrates less strongly during the driving of the motor vehicle when the motor-pump unit 28 is simply connected to the axle carrier of the motor vehicle, and / or that vibration excitations or pulsations caused by the motor-pump unit 28 itself are only transmitted to the body via the axle carrier in a damped form.

[0031] The motor-pump unit 28, which comprises the two motor-pump groups 18 and the common control device 27, is attached to the axle carrier of the respective axle on both sides of the same via preferably two bearings 29, wherein the bearings 29 arranged on both sides of the motor-pump unit 28 are each received or attached in a common bearing carrier 30.

[0032] On a first side of the motor-pump unit 28, a first bearing support 30 is provided, which accommodates the respective bearings 29, wherein this first bearing support 30 is integrated into a first housing cover 31 of a housing 32 of the motor-pump unit 28. This first bearing support 30 is in Fig. 2, Fig. 3 shown on the right side of the motor-pump unit 28, wherein this first bearing support 30 is integrated into the housing cover 31 of the housing 32 of the motor-pump unit 28, which closes the end face of that cavity of the housing 32 in which the in Fig. 2, Fig. 3 shown right motor-pump group 18 is included.

[0033] A second bearing support 30, which in turn preferably accommodates two bearings 29, is connected via a tie rod 33 (see Fig. 6, Fig. 13) and a coaxially arranged bearing tube (see Fig. 13, Fig. 14) connected to the second housing cover 35 of the housing 32 of the motor-pump unit 28 (see Fig. 6, Fig. 7) The tie rod 33 connects the second bearing support 30 to the second housing cover 35 of the housing 32 of the motor-pump unit 28 under tensile stress on the tie rod 33. The bearing tube 34, on the other hand, is subjected to compressive stress. Moments about a bearing tube axis and a tie rod axis are transmitted via friction. The transmissible frictional torques can be increased by knurling or similar geometries on the end faces of the bearing tube 34. The second housing cover 35 closes the end face of the cavity in the housing 32 in which the Fig. 2, Fig. 3 shown left motor-pump group 18 is included.

[0034] The tie rod 33 has an external thread at one end 33a, which is screwed into a recess 36 on the second housing cover 35 that has an internal thread. The second bearing support 30 engages at the opposite end 33b of the tie rod 33, such that the second bearing support 30 is placed onto the second end 33b of the tie rod 33 and is secured in this position by a nut 47 on the second end 33b of the tie rod 33. The nut 47 has an internal thread which engages with a corresponding external thread on the second end 33b of the tie rod 33.

[0035] How Fig. 2 and Fig. Since the second bearing support 30 can be removed, it can be mounted on the tie rod 33 in virtually any relative rotational position. This makes it possible to attach the motor-pump unit 28 to the axle carrier of the vehicle while compensating for manufacturing tolerances. Furthermore, by rotating the second bearing support 30 around the bearing tube axis or tie rod axis, it is possible to flexibly adapt to different installation spaces on different axles and thus flexibly use the damping arrangement on different axles.

[0036] Thus, while the first bearing support 30, which preferably accommodates two bearings 29, is integrated into a first housing cover 31 of the housing 32 of the motor-pump unit 28, the second bearing support 30, which also preferably accommodates two bearings 29, is mounted on the second housing cover 35 of the housing 32 of the motor-pump unit 28 via the tie rod 33 and the bearing tube 34.

[0037] As already explained above, the tie rod 33 runs inside the bearing tube 34, with the bearing tube 34 being attached at a first end 34a to a projection 37 on the second housing cover 35 and at an opposite end 34b to a projection 48 of the second bearing support 30.

[0038] The respective bearing support 30, which accommodates the two bearings 29, is shaped like spectacles. It has a monolithic base body 38 with two adjacent recesses 39, in each of which one of the elastic bearings 29 is inserted.

[0039] The monolithic base body 38 of the first bearing support 30 is integrated into the first housing cover 31 of the housing 32 of the motor-pump unit 28. The monolithic base body 38 of the second bearing support 30 is connected to the second end 33b of the tie rod 33 and to the bearing tube 34.

[0040] Fig. 8, Fig. 9, Fig. 10, Fig. 11 and Fig. Figure 12 shows excerpts from a component comprising the motor-pump unit 28, the bearing tube 34, the two bearing supports 30 and the four bearings 29, together with excerpts from an axle carrier 41.

[0041] According to Fig. 8, Fig. 10 , Fig. 11 and Fig. 12 The motor-pump unit 28 is mounted to a first section 41a of the axle carrier 41 by means of the first bearing support 30 and the bearings 29 received by the same, wherein the section 41a of the axle carrier 41 engages in a free space between the first housing cover 31 and an adjacent section of the housing 32 of the motor-pump unit 28, so that the first bearing support 30 partially covers the first section 41a of the axle carrier 41 on the outside in the assembled state.

[0042] On the opposite section 41b of the axle carrier 41, the second bearing support 30 also covers the second section 41b of the axle carrier 41 section by section on the outside when assembled.

[0043] For the assembly of the unit consisting of the motor-pump unit 28, the bearing rod 34, the two bearing supports 30 and the bearings 29 on the axle carrier 41, both bushings 43 and screws 44 extend through central recesses 42 in the bearings 29. The bushings 43 are inserted into the central recesses 42 of the bearings 29, and the screws 44 extend through these recesses, with the external threads of the screws 44 engaging in internal threads of bores in sections 41a, 41b of the axle carrier 41.

[0044] Fig.Figure 12 shows clips 45 that are inserted into the bushings 43 and serve for the axially fixed, stable, and space-saving guidance and fixing of cables 46 and / or hoses. For example, electrical cables 46 leading to the control unit 27 can be guided and fixed in a defined manner within the area of ​​the axle carrier 41, namely via the clips 45 inserted into the bushings 43 of the bearings 29. The bushings 43 preferably have an internal contour with which the clips 45, namely the projections of the clips 45 that engage in the bushings 43, can be connected by interlocking. This internal contour of the bushings can be designed as an internal thread.

[0045] Preferably, the tie rod 33, together with the bearing tube 34 and / or the motor-pump unit 28, extends in place of a stabilizer in a space intended for the stabilizer, with the two bearing supports 30 preferably being attached to connection areas 41a, 41b of the axle carrier 41, which are already provided for the attachment of a stabilizer. This allows for a particularly advantageous integration of the motor-pump unit 28 into a motor vehicle with minimal installation space requirements.

[0046] The invention allows the motor-pump unit 28 of a damping arrangement for the axle of a motor vehicle to be advantageously mounted on the axle carrier 41. This is achieved with minimal installation space requirements, and the motor-pump unit 28 vibrates less during vehicle operation. Furthermore, the connection of the motor-pump unit 28 to the axle carrier 41 is acoustically decoupled, so that no unwanted noise is generated during vehicle operation.

[0047] By modifying the length of the bearing tube 34 and the tie rod 33, the invention can be used on different motor vehicles. The relative position of the second bearing support 30 to the bearing tube 34 and tie rod 33 also allows for flexible use of the invention on different motor vehicles, particularly when the position of the mounting points of the bearings 29, which are held by the second bearing support 30, differs from vehicle to vehicle on corresponding sections of the axle carrier. The damping arrangement according to the invention can therefore be easily adapted to different vehicle types, and manufacturing tolerances can be compensated for.

[0048] The invention further relates to a motor vehicle with at least one damping arrangement according to the invention. Preferably, a damping arrangement according to the invention is installed in the area of ​​each axle of the motor vehicle, i.e., both in the area of ​​a front axle and in the area of ​​a rear axle of the motor vehicle.

Claims

[1] Damping arrangement (10) of an active suspension for an axle of a motor vehicle, wherein a damping system (10a, 10b) interacts with each wheel of the axle, wherein each of the damping systems (10a, 10b) comprises the following assemblies: a damper (11) comprising a double-acting hydraulic cylinder (12) and a piston (13), wherein the damper (11) can be coupled to a wheel suspension system of the respective wheel, a hydraulic pump (16) and an electric motor (17) for driving the respective hydraulic pump (16), wherein the hydraulic pump (16) can be driven in different directions of rotation by the electric motor (17) to provide different delivery directions, a hydraulic unit (19) comprising a hydraulic reservoir (20) and valves (21, 22, 23, 24), wherein the hydraulic pump (16) and the hydraulic unit (19) of the respective damping system (10a, 10b) interact with hydraulic chambers (14, 15) of the hydraulic cylinder (12) of the respective damping system (10a, 10b) in such a way that, depending on the delivery direction of the hydraulic pump (16) of the hydraulic unit (19), a movement of the piston (13) in a first actuation direction or in a second actuation direction can be provided, wherein the hydraulic pumps (16) and the electric motors (17) of both damping systems (10a, 10b) are combined to form a motor-pump unit (28), characterized by , that The motor-pump unit (28) is attached to an axle carrier (41) of the axle on both sides of the same by at least two bearings (29) each, which are each received in a common bearing support (30), wherein a first bearing support (30) is integrated into a first housing cover (31) of a housing (32) of the motor-pump unit (28), and wherein a second bearing support (30) is connected to a second housing cover (35) of the housing (32) of the motor-pump unit (28) via a tie rod (33) and a bearing tube (34). [2] Damping arrangement according to claim 1, characterized by , that the respective bearing support (30) is designed in such a spectacle-like manner that it has a monolithic base body (38) with two adjacent recesses (39) for receiving one elastic bearing (29) each. [3] Damping arrangement according to claim 2, characterized by, that the base body (38) of the first bearing support (30) is integrated into the first housing cover (31) of the housing (32) of the motor-pump unit (28). [4] Damping arrangement according to claim 2 or 3, characterized by , that the base body (38) of the second bearing support (30) is connected via the bearing tube (34) to the second housing cover (35) of the housing (32) of the motor-pump unit (28) under pressure load of the bearing tube (34), wherein the base body (38) of the second bearing support (30) and the second housing cover (35) are arranged opposite each other on the bearing tube (34) and are connected to each other via the tie rod (33) under tensile load of the tie rod (33). [5] Damping arrangement according to any one of claims 1 to 4, characterized by, that the tie rod (33) runs inside the bearing tube (34), the bearing tube (34) extending between the second bearing support (30) and the second housing cover (35) of the housing (32) of the motor-pump unit (28) and surrounding the tie rod (33) on the outside. [6] Damping arrangement according to any one of claims 1 to 5, characterized by , that the respective bearing (29) has a central recess (42) through which a bushing (43) and a screw (44) extend for fastening the respective bearing (29) to the axle carrier (41). [7] Damping arrangement according to claim 6, characterized by , that the respective socket (43) receives a clip (45) to guide cables (46) and / or hoses to the respective bearing (29). [8] Damping arrangement according to any one of claims 1 to 7, characterized by , that the axle carrier (41) is a subframe or subframe. [9] Damping arrangement according to any one of claims 1 to 8, characterized by, that the tie rod (33) and the bearing tube (34) and / or the motor-pump unit (28) extend in place of a stabilizer in the installation space for the stabilizer and are preferably attached via the respective bearing support (30) to connection areas (41a, 41b) of the axle carrier (41) for the stabilizer. [10] Motor vehicle, with multiple axles, wherein each axle is assigned a damping arrangement (10) according to one of claims 1 to 9.

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