Damping device for axle of motor vehicle and motor vehicle

Abstract

A damping device for an active chassis of an axle of a motor vehicle wherein a damping system cooperates with each wheel of the axle wherein each damping system comprises the following assemblies: a damper, a hydraulic pump and an electric motor. The hydraulic unit comprises a hydraulic storage tank and a valve, and wherein the hydraulic pump and the hydraulic unit of the respective damping system cooperate with the hydraulic chamber of the hydraulic cylinder of the respective damping system such that a movement of the piston in a first actuation direction or a second actuation direction can be provided depending on the conveying direction of the hydraulic pump of the hydraulic unit, wherein the hydraulic pumps and the electric motors of the two damping systems are combined to form a motor-pump unit. The motor-pump unit is fastened on both sides of the motor-pump unit to an axle carrier of the axle via two bearings, which are received in a common bearing carrier, the first bearing carrier being integrated into a first housing cover of the housing of the motor-pump unit, and the second bearing carrier being integrated into a second housing cover of the housing of the motor-pump unit. The second support bracket is connected to a support tube and a pull rod of a second housing cover of the housing having the motor-pump unit.

Description

Technical Field

[0001] The invention relates to a damping / vibration reduction device for a motor vehicle axle, an active chassis of a motor vehicle and a motor vehicle. Background Art

[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, the damping system having a damper, a hydraulic pump driven by an electric motor, a hydraulic storage tank and a plurality of valves. The damper is formed by a double-acting hydraulic cylinder and a piston that can reciprocate in the hydraulic cylinder. The hydraulic pump is connected to the hydraulic chamber of the hydraulic piston via a hydraulic line, wherein the movement of the piston in a first actuation direction or a second actuation direction can be provided depending on the delivery direction of the hydraulic pump.

[0003] The axle of a motor vehicle comprises two wheels, which are connected to an axle carrier via respective wheel suspensions, which axle carrier can be designed as a subframe or auxiliary frame. The subframe is connected to the body of the motor vehicle via a bearing element in a decoupleable manner. The auxiliary frame is connected to the body of the motor vehicle in a non-decoupled manner. The axle of the active chassis is provided with a damping system for each wheel. The two damping systems for the two wheels of an axle are components of the damping device of the respective axle of the motor vehicle.

[0004] DE 10 2019 118 384 A1 discloses that the electric motor and hydraulic pump of the damping system of the respective wheels of the axle of an active chassis are combined to form a motor-pump unit. A common electronic unit cooperates with the two motor-pump units of the respective axle. The electronic unit is installed between the two motor-pump units. The two motor-pump units form a motor-pump unit, which is installed on the motor vehicle via a receptacle. The electronic unit is a component of the motor-pump unit.

[0005] WO 2017 / 000 990A1 discloses an electric coolant pump for a motor vehicle having a pump housing, wherein the pump housing is fixed to the vehicle structure via a fastening structure. The fastening structure is arranged only on the flow housing part of the pump housing on the pump side.

[0006] In practice, it has been found that the motor-pump unit of the damping device of the axle of the active chassis vibrates strongly during driving, in particular due to excitations from the road. This is disadvantageous.

[0007] Therefore, there is a need for a damping device for an axle of an active chassis of a motor vehicle, which limits the vibration amplitude of the motor-pump unit of the damping device and also limits the transmission of vibration excitations or pulsations caused by the motor-pump unit itself to the body via the axle carrier. Summary of the invention

[0008] The object of the invention is to provide a damping device for an axle of an active chassis of a motor vehicle, in which a motor-pump unit vibrates less when driving while being simply connected to the axle carrier of the motor vehicle. It is also intended to provide a motor vehicle having such a damping device.

[0009] This object is achieved by a damping device according to claim 1 and a motor vehicle according to claim 10 .

[0010] In the damping device according to the invention, the motor-pump unit is fastened on both sides thereof to an axle bracket of an axle of a motor vehicle via at least two bearings each received in a common bearing bracket.

[0011] The first bearing bracket is integrated into a first housing cover of the housing of the motor pump unit, while the second bearing bracket is connected to a second housing cover of the housing of the motor pump unit via a bearing tube and tie rods.

[0012] The motor-pump unit of the damping device can be simply connected to the axle carrier of the motor vehicle. In addition, when driving, the motor-pump unit vibrates less and transmits the natural vibrations to the vehicle body in a damped manner.

[0013] Preferably, the respective support bracket is designed in a manner similar to spectacles, so that it comprises a one-piece base body and two recesses located side by side for receiving each elastic support element. This configuration of the support bracket allows the motor-pump unit to be connected to the axle bracket in a simple manner. In addition, the support element reduces the tendency of the motor pump unit to vibrate when the motor vehicle is traveling.

[0014] Preferably, the base body of the first bearing bracket is integrated into a first housing cover of the housing of the motor pump unit, while the base body of the second bearing bracket is connected to the second housing cover of the housing via a bearing tube when the bearing tube is subjected to pressure loads, wherein the base body of the second bearing bracket and the second housing cover are arranged opposite one another on the bearing tube and are connected to one another via a tie rod when the tie rod is subjected to tensile loads. This design is particularly preferred in order to reduce the tendency of the motor pump unit to vibrate while simply connecting the motor pump unit to the axle bracket.

[0015] Preferably, the respective support has a central recess through which a bushing and a screw can extend for fastening the respective support to the axle carrier, wherein the respective bushing receives a clamp for guiding a cable and / or a hose on the respective support. This is preferred in order to fasten the cable and / or hose to the motor-pump unit in a defined manner and to decouple them from the motor-pump unit vibrations and thus to be guided on the damping device.

[0016] Preferably, the support tube and the tie rod and / or the motor-pump unit extend in the structural space for the stabilizer instead of the stabilizer and are preferably fastened to the connection region of the axle carrier for the stabilizer via a corresponding support bracket. This advantageously makes it possible to integrate the motor-pump unit together with the support tube and the tie rod into the motor vehicle with a small structural space requirement. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of a hydraulic assembly of a damping device according to the invention for a wheel of an axle of an active chassis according to the invention;

[0018] Figure 2 is a first perspective view of a detail of a damping device according to the invention in the region of a motor-pump unit, a support tube and a support element;

[0019] Figure 3 yes Figure 2 A second perspective view of a portion of;

[0020] Figure 4 yes Figure 2 and Figure 3 A detailed view of a portion in the region of a first end of the motor-pump unit;

[0021] Figure 5 yes Figure 2 and Figure 3 Another detailed view of a detail in the region of the second end of the motor-pump unit;

[0022] Figure 6 yes Figure 5 Detailed view with tie rods;

[0023] Figure 7 yes Figure 6 Detail of the support tube;

[0024] Figure 8 is a detail of a motor vehicle in the region of a first end of an axle carrier and in the region of a first end of a damping device mounted on the axle carrier;

[0025] Fig. 9 is a detail of a motor vehicle in the region of a second end of an axle carrier and in the region of a second end of a damping device mounted on the axle carrier;

[0026] Fig.10 yes Figure 8 A partially exploded perspective view of a part of the

[0027] Fig.11 yes Figure 8 , Fig.10 Another view of a part of;

[0028] Fig.12 yes Fig.11 A partial view of the device with clips and cables;

[0029] Fig.13 is a first perspective view of another detail of the damping device according to the invention in the region of the second end;

[0030] Fig.14 yes Fig.13 A second perspective view of a portion of . DETAILED DESCRIPTION

[0031] A motor vehicle, such as a passenger car, has a plurality of axles. Each axle has two wheels, which are usually connected to an axle carrier, in particular a subframe, of the respective axle via a corresponding wheel suspension. The subframe of the respective axle is connected to the body of the motor vehicle in a decoupled manner via a support. The wheel suspension can also be connected to an axle carrier designed as an auxiliary frame, which is connected to the body of the motor vehicle in a non-decoupled manner. The subframe can preferably be used in the area of ​​the rear axle, the auxiliary frame preferably in the area of ​​the front axle. If the respective axle of the motor vehicle is an axle of an active chassis of the motor vehicle, a damping device 10 is present for the two wheels of the axle of the active chassis, wherein Figure 1 A preferred embodiment of a damping device 10 for two wheels of an axle of an active chassis of a motor vehicle is shown.

[0032] The damping device 10 of the axle of the active chassis has a damping system 10a, 10b for each wheel of the axle. Each of the damping systems 10a, 10b comprises a damper 11 which can be coupled to a wheel suspension system (not shown) for the corresponding wheel (not shown). Each damper 11 is formed by a double-acting hydraulic cylinder 12 and a piston 13, wherein the piston 13 can be reciprocated in the hydraulic cylinder 12 ( Figure 1The hydraulic cylinder 12 designed as a double-acting hydraulic cylinder in each of the damping systems 10a, 10b includes hydraulic chambers 14, 15 on each side of the piston 13. Depending on which of the two hydraulic chambers 14, 15 hydraulic oil is supplied to and which of the two hydraulic chambers 15, 14 is exhausted, the piston 13 can be displaced in a first actuation direction or in an opposite second actuation direction. The first actuation direction of the piston 13 is actuation in a pulling direction, and the second actuation direction of the piston 13 is actuation in a pushing direction.

[0033] Each damping system 10a, 10b further comprises 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 set 18. The hydraulic pump 16 is a reversible pump, which can be driven by the respective electric motor 17 in different directions of rotation in order to provide different delivery directions.

[0034] Figure 1 Each damping system 10a, 10b also comprises a hydraulic unit 19 having a hydraulic reservoir 20 and valves 21, 22, 23, 24. The valves 21, 22 are non-return valves and the valves 23, 24 are damping valves. The hydraulic reservoir 20 of each damping system 10a, 10b is engaged in each case between the non-return valves 21, 22 and between the damping valves 23, 24 on the hydraulic line of the hydraulic unit 19, which is connected to the hydraulic chambers 14, 15.

[0035] 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 each damping system, in order to displace the piston 13 in a first movement direction (i.e., the pulling direction), oil is supplied to the hydraulic chamber 14 and oil is transported away from the hydraulic chamber 15, or in order to provide a second movement direction of the piston 13 in a second movement direction (i.e., the pushing direction), oil is supplied to the hydraulic chamber 15 and oil is transported away from the hydraulic chamber 14.

[0036] The hydraulic pump 16 of the motor-pump group 18 of the corresponding damping system 10a, 10b is connected to the hydraulic unit 19 of the corresponding damping system 10a, 10b, which includes a hydraulic storage tank 20 and valves 21, 22, 23, 24, and the hydraulic unit is preferably installed as a unit on the damper 12 or the hydraulic cylinder 13 via hydraulic pipelines 25, 26.

[0037] The motor-pump units 18 of both damping systems 10a, 10b of the damping device 10 of the axle of the active chassis interact with a common control device 27. The electric motors 17 of both motor-pump units 18 can be driven by the common control device 27.

[0038] The two motor-pump assemblies 18 of the two damping systems 10 a , 10 b and a common control device 27 form a motor-pump unit 28 of the damping device 10 .

[0039] The present invention relates to such details of the damping device 10, which can be used to ensure that the motor-pump unit 28 of the damping device 10 of the axle of the active chassis of a motor vehicle does not vibrate too strongly when the motor vehicle is running, 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 transmitted to the vehicle body via the axle carrier only after being damped.

[0040] A motor-pump unit 28 comprising two motor-pump assemblies 18 and a common control device 27 is fastened on both sides thereof to the axle bracket of the corresponding axle via preferably two bearings 29 , the bearings 29 arranged on both sides of the motor-pump unit 28 being each received or fastened in a common bearing bracket 30 .

[0041] A first bearing bracket 30 is located on a first side of the motor-pump unit 28, which first bearing bracket receives a corresponding bearing 29, wherein the first bearing bracket 30 is integrated into a first housing cover 31 of a housing 32 of the motor-pump unit 28. Figure 2 , Figure 3 , on the right side of the motor-pump unit 28, wherein the first bearing bracket 30 is integrated into a housing cover 31 of a housing 32 of the motor-pump unit 28, which closes the receiving portion of the housing 32 at the end side. Figure 2 , Figure 3 The cavity of the right motor-pump unit 18 is shown in FIG.

[0042] The second support bracket 30 which preferably receives the two support members 29 is connected via a tie rod 33 (see Figure 6 , Fig.13 ) and coaxially arranged support tube (see Fig.13 , Fig.14 ) is connected to the second housing cover 35 of the housing 32 of the motor-pump unit 28 (see Figure 6 , Figure 7 ). The tie rod 33 connects the second bearing bracket 30 to the second housing cover 35 of the housing 32 of the motor-pump unit 28 when the tie rod 33 is subjected to a tensile load. On the other hand, the bearing tube 34 is correspondingly subjected to a compressive load. The torque about the bearing tube axis and the tie rod axis is transmitted by friction. The transferable friction torque can be increased by knurling or similar geometric shapes on the end face of the bearing tube 34. The second housing cover 35 closes the receiving end of the housing 32 at the end side. Figure 2 , Figure 3 The cavity of the left motor-pump unit 18 is shown in FIG.

[0043] The tie rod 33 has an external thread at the first end 33a, with which the tie rod is screwed into a recess 36 having an internal thread on the second housing cover 35. The second bearing bracket 30 engages on the opposite second end 33b of the tie rod 33, so that the second bearing bracket 30 is pushed onto the second end 33b of the tie rod 33 and is fixed at the second end 33b of the tie rod 33 via a nut 47 in the pushed position. The nut 47 has an internal thread here, which cooperates with a corresponding external thread at the second end 33b of the tie rod 33.

[0044] from Figure 2 and Figure 3 It can be seen that the second bearing bracket 30 can be mounted in almost any relative rotational position on the tie rod 33. Thus, the motor-pump unit 28 can be fastened to the axle bracket of the motor vehicle while compensating for manufacturing-related tolerances. Furthermore, by rotating the second bearing bracket 30 about the bearing tube axis or the tie rod axis, it is possible to flexibly adjust to different installation spaces on different axles and thus to flexibly use the damping device on different axles.

[0045] Therefore, when the first support bracket 30 that preferably receives the two support members 29 is integrated into the first housing cover 31 of the housing 32 of the motor-pump unit 28, the second support bracket 30 that also preferably receives the two support members 29 is mounted on the second housing cover 35 of the housing 32 of the motor-pump unit 28 via the pull rod 33 and the support tube 34.

[0046] As described above, the tie rod 33 extends within the support tube 34, wherein the support tube 34 is attached / slipped onto the protrusion 37 on the second housing cover 35 at a first end 34a and attached / slipped onto the protrusion 48 of the second support bracket 30 at an opposite end 34b.

[0047] The corresponding support bracket 30 receiving the two support members 29 has a design similar to that of spectacles. The corresponding support bracket has an integral base body 38, which has two recesses 39 arranged side by side, wherein one of the elastic support members 29 is inserted into each recess of the two recesses 39.

[0048] The integral base body 38 of the first bearing bracket 30 is integrated into the first housing cover 31 of the housing 32 of the motor-pump unit 28. The integral base body 38 of the second bearing bracket 30 is connected to the second end 33b of the tie rod 33 and to the bearing tube 34.

[0049] Figure 8 , Fig. 9 , Fig.10 , Fig.11 and Fig.12A detail of a structural unit comprising the motor-pump unit 28 , the support tube 34 , two support brackets 30 and four support elements 29 and a detail of the axle bracket 41 are shown.

[0050] according to Figure 8 , 10 , 11 and 12, the motor-pump unit 28 is mounted to the first section 41a of the axle bracket 41 by means of the first supporting bracket 30 and the supporting member 29 received therein, wherein the section 41a of the axle bracket 41 is engaged in the gap between the first housing cover 31 and the adjacent section of the housing 32 of the motor-pump unit 28, so that the first supporting bracket 30 partially covers the first section 41a of the axle bracket 41 on the outside in the assembled state.

[0051] On the opposite section 41 b of the axle carrier 41 , the second bearing bracket 30 also partially covers the second section 41 b of the axle carrier 41 in the assembled state.

[0052] Both the bushing 43 and the screw 44 extend through the central opening 42 in the support 29 in order to mount the structural unit consisting of the motor-pump unit 28, the support tube 34, the two support brackets 30 and the support 29 on the axle carrier 41. The bushing 43 is inserted into the central opening 42 of the support 39, and the screw 44 extends through the central opening, wherein the external thread of the screw 44 engages in the internal thread of the hole in the sections 41a, 41b of the axle carrier 41.

[0053] Fig.12 A clip 45 is shown, which is inserted into the bushing 43 and serves to guide and fix cables 46 and / or hoses in an axially fixed / fixed on the axle, stable and space-saving manner. For example, a cable 46 leading to the control device 27 can be guided and fixed in a defined manner in the region of the axle carrier 41, i.e. via the clip 45 inserted into the bushing 43 of the support 29. The bushing 43 preferably has an inner contour to which the clip 45, i.e. the projection of the clip 45 engaged in the bushing 43, can be connected by gripping / clamping. Such an inner contour of the bushing can be embodied as an internal thread.

[0054] Preferably, the tie rod 33 together with the support tube 34 and / or the motor-pump unit 28 extends in the structural space for the stabilizer instead of the stabilizer, wherein the two support brackets 30 are preferably fastened to the connecting areas 41a, 41b of the axle bracket 41, which are themselves used to fasten the stabilizer. This allows a particularly advantageous integration of the motor-pump unit 28 into the motor vehicle with a minimum space requirement.

[0055] By means of the invention, the motor-pump unit 28 for a damping device of an axle of a motor vehicle can be advantageously mounted on an axle carrier 41. This is achieved with minimal installation space requirement, wherein the motor-pump unit 29 vibrates less when the motor vehicle is moving. In addition, the connection of the motor-pump unit 29 to the axle carrier 41 is acoustically decoupled, so that no undesirable noise occurs when the motor vehicle is moving.

[0056] The invention can be used on different motor vehicles by varying the length of the support tube 34 and the tie rod 33. The relative position of the second support bracket 30 relative to the support tube 34 and the tie rod 33 also allows the invention to be used flexibly on different motor vehicles, in particular if the position of the fastening point of the support 29 received by the second support bracket 30 at the corresponding section of the axle bracket varies from vehicle to vehicle. Thus, the damping device according to the invention can be easily adapted to different types of vehicles and manufacturing tolerances can also be compensated.

[0057] The invention also relates to a motor vehicle having at least one damping device according to the invention. Preferably, the damping device according to the invention is installed in the region of each axle of the motor vehicle, ie in the region of the front axle and the region of the rear axle of the motor vehicle.

Claims

1. A damping device (10) for an active chassis of an axle of a motor vehicle, wherein: Each wheel of the axle cooperates with a damping system (10a, 10b), wherein each of the damping systems (10a, 10b) comprises the following components: A damper (11) having a double-acting hydraulic cylinder (12) and a piston (13), wherein the damper (11) can be coupled to a wheel suspension system of a corresponding 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 by the electric motor (17) in different directions of rotation to provide different delivery directions, A hydraulic unit (19) having a hydraulic storage tank (20) and valves (21, 22, 23, 24), wherein a hydraulic pump (16) of a corresponding damping system (10a, 10b) and the hydraulic unit (19) cooperate with a hydraulic chamber (14, 15) of a hydraulic cylinder (12) of the corresponding damping system (10a, 10b) so 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 a second actuation direction can be provided, The hydraulic pump (16) and the electric motor (17) of the two damping systems (10a, 10b) are combined to form a motor-pump unit (28), which is characterized in that: The motor-pump unit (28) is fastened on both sides thereof to the axle bracket (41) of the axle via at least two supports (29) received in a common support bracket (30), wherein a first support bracket (30) is integrated into a first housing cover (31) of the housing (32) of the motor-pump unit (28), and a second support bracket (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 support tube (34).

2. The damping device according to claim 1, characterized in that: The corresponding support bracket (30) is designed in a similar manner to spectacles, so that the support bracket comprises an integral base body (38) having two recesses (39) located side by side for receiving the corresponding elastic support element (29).

3. The damping device according to claim 2, characterized in that: A base body (38) of the first bearing bracket (30) is integrated into a first housing cover (31) of a housing (32) of the motor-pump unit (28).

4. The damping device according to claim 2 or 3, characterized in that: The base body (38) of the second bearing bracket (30) is connected to the second housing cover (35) of the housing (32) of the motor-pump unit (28) via the bearing tube (34) when the bearing tube (34) is subjected to a pressure load, wherein the base body (38) of the second bearing bracket (30) and the second housing cover (35) are arranged opposite to each other on the bearing tube (34) and are connected to each other via the tie rod (33) when the tie rod (33) is subjected to a tensile load.

5. The damping device according to any one of claims 1 to 4, characterized in that: The tie rod (33) extends in the support tube (34), wherein the support tube (34) extends between the second support bracket (30) and a second housing cover (35) of the housing (32) of the motor-pump unit (28) and surrounds the tie rod (33) on the outside.

6. The damping device according to any one of claims 1 to 5, characterized in that: The corresponding support (29) has a central notch through which a bushing (43) and a screw (44) extend to secure the corresponding support (29) to the axle bracket (41).

7. The damping device according to claim 6, characterized in that: The respective bushing (43) receives a clamp (45) for guiding a cable (46) and / or a hose on the respective support (29).

8. The damping device according to any one of claims 1 to 7, characterized in that: The axle bracket (41) is a subframe or an auxiliary bracket.

9. The damping device according to any one of claims 1 to 8, characterized in that: The tie rod (33) and the support tube (34) and / or the motor-pump unit (28) extend in the structural space for the stabilizer instead of the stabilizer and are preferably fastened to the connection area (41a, 41b) of the axle carrier (41) for the stabilizer via the corresponding support bracket (30).

10. A motor vehicle having a plurality of axles, wherein each axle is assigned a damping device (10) according to any one of claims 1 to 9.

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