Bending lifting spring for a motor vehicle for lifting-roll decoupling

Abstract

The invention relates to a bending stroke spring for a motor vehicle, comprising a first spring body and a second spring body, wherein the first spring body comprises a first end with a first stop eye and a second end with a second stop eye, wherein a pivot joint is arranged on an upper side of the first spring body centrally between the first stop eye and the second stop eye, wherein the second spring body is mounted on the pivot joint, wherein the second spring body is pivotable parallel to the first spring body by means of the pivot joint.

Description

[0001] The present invention relates to a bending spring for a motor vehicle for lifting-roll decoupling.

[0002] In practical engineering, the design and response of suspension systems pose a complex problem. In particular, it involves the challenge of how to effectively decouple the heave and roll movements of a vehicle or a mechanical device. Conventional suspension systems, which usually use a single type of spring, often result in a compromise between the heave and roll rates, resulting in suboptimal operating characteristics. Known applications from motorsports for decoupling heave and roll movements have vehicle-concept-dependent disadvantages such as size, weight, or complexity due to other requirements such as installation space or spring travel, and are therefore not directly applicable for use on public roads.

[0003] A low roll rate may be desirable, for example, in conjunction with active suspension systems to ensure system stability, such as when cornering, and to increase comfort. At the same time, the roll rate requires a certain degree of progressiveness, especially under variable load conditions, to provide effective protection against shocks and vibrations. Space-related limitations and the requirements of use on public roads versus use on a racetrack create a conflict, as conventional systems do not always satisfactorily combine these requirements.

[0004] Another significant challenge is the choice of material. Both the weight of the suspension and its durability and performance are of fundamental importance, especially in highly demanding applications where material fatigue and failure can lead to serious failures.

[0005] In summary, the problem to be solved is the development of a suspension that offers a low roll rate while maintaining progressive rebound, as well as the selection of materials that ensure performance and durability under diverse operating conditions. Furthermore, there is a requirement for a space-optimized, low-complexity solution with a few components.

[0006] WO 2016 / 076 765 A1 discloses a spring construction in a motor vehicle in which a leaf spring can be connected via a spring holder to rigid arms via a roll suspension in order to react accordingly to various spring movements, such as rolling movements of the motor vehicle.

[0007] DE 10 2019 218 635 A1 discloses a lowerable ride-level axle. This comprises a frame, a left and right axle guide mounted on the frame, and a spring-damping system mounted on the frame. The axle guides are each operatively connected to a leaf spring and a shock absorber of the spring-damping system. The axle guides are each connected to the leaf spring via a linearly adjustable kinematic system.

[0008] DE 20 2022 103 702 U1 discloses a suspension for a vehicle, comprising a main frame and a plurality of lower leaf springs mounted on either side of the main frame. An upper leaf spring is arranged above the lower leaf spring so that it is spaced apart from the lower leaf spring. A connecting bracket is supported by the upper leaf spring and is rotatably mounted on the main frame.

[0009] FR 2 586 624 A1 discloses a suspension, the suspension comprising a guide device formed by a split tube running transversely to the vehicle, each end of which is connected to the wheel axle via an arm and to the wheel axle via a joint connected to the chassis, and a suspension formed by two leaf springs made of composite material lying one above the other and arranged transversely to the vehicle, one of the springs being fastened to the chassis 1 at its center.

[0010] US 2 250 247 A discloses a wheel suspension system for motor vehicles with a wheel carrier axle and two transverse springs arranged one above the other, wherein the spring center parts are located above and below the axle base and the outer ends of both springs are connected relative to each other and to the axle at points below the axle, wherein the lower spring is pivotally mounted centrally with respect to the upper spring.

[0011] US 2 072 156 A discloses a spring suspension for vehicles, wherein a single leaf spring assembly is provided which is attachable at its central portion to the floor of a vehicle body, and two leaf spring assemblies between the single assembly and the wheels of the vehicle, each end of the single assembly being attached to the central portion of one of the two assemblies.

[0012] The current state of the art merely aims to reduce background noise, but does not address the creation of a comprehensive driving experience.

[0013] It is therefore an object of the invention to provide a device which provides a decoupling of suspension for lifting and / or rolling movements and enables an independent influence or reaction to occurring lifting and rolling movements.

[0014] The bending-lift spring for a motor vehicle for lift-roll decoupling can be designed for use in passenger cars. The individual axes and planes as well as the rotational and pivoting movements refer to the vehicle coordinate system commonly used in vehicle construction. The origin of the coordinate system is at the vehicle's center of gravity. A positive X-axis points in the direction of travel. A positive Z-axis points towards the vehicle roof, i.e. upwards. A positive Y-axis is perpendicular to the driver's door of a left-hand drive vehicle and points to the left in the direction of travel. Not only directed movements but also moments can occur on the vehicle. The moments occur around the coordinate axes.

[0015] Movement around the X-axis is called roll, movement around the Y-axis is called pitch, and movement around the Z-axis is called yaw. Yaw can also be described as "skidding."

[0016] For this purpose, the invention provides a device, namely a flexural spring for a motor vehicle for heave-roll decoupling, according to claim 1, and a motor vehicle according to claim 8 comprising a flexural spring for a motor vehicle for heave-roll decoupling. Advantageous embodiments can be found in the subclaims and the description.

[0017] The invention relates to a bending stroke spring for a motor vehicle for lifting-roll decoupling, comprising a first spring body and a second spring body, wherein the first spring body comprises a first end with a first coupling element and a second end with a second coupling element, wherein on an upper side of the first spring body centrally between the first coupling element and the second coupling element a rotary joint is arranged, wherein the second spring body is mounted on the rotary joint, wherein the second spring body is pivotable parallel to the first spring body by means of the rotary joint.

[0018] The coupling of the first spring body with the second spring body can enable a rolling movement of the first spring body in a chassis without the second spring body being subjected to a force. During a lifting movement of the chassis in which the first spring body is bent in the Z direction via the first coupling element and the second coupling element, the first spring body can be subjected to force first. From a predetermined deflection of the first spring body, the second spring body comes into contact with the first spring body, whereby a first spring constant of the first spring body and a second spring constant of the second spring body are added. This achieves a stronger lifting resilience of the bending lifting spring.

[0019] In an advantageous further development, a first part of the rotary joint is mechanically connected to the first spring body in a force-locking manner via at least two stud bolts.

[0020] In a further advantageous development, the first spring body is designed as a leaf spring.

[0021] In an advantageous further development, the first spring body consists of GRP or comprises such a material and / or consists of CFRP or comprises such a material and / or the second spring body consists of titanium or comprises such a material and / or consists of a fiber composite material or comprises such a material.

[0022] According to the invention, the second spring body is designed as a U-shaped profile. Alternatively, the second spring body can be designed as a square profile.

[0023] According to the invention, the second spring body, which is designed as a U-profile, at least partially surrounds the first spring body.

[0024] By enclosing the first spring body with the second spring body, a predefined distance between the first spring body and the second spring body can be set by adjusting the position of the first part of the swivel joint and the second part of the swivel joint. This allows the deflection depth of the first spring body to be adjusted before it comes into contact with the second spring body during a lifting movement.

[0025] In a further advantageous development, the first spring body is formed in two parts or one part.

[0026] In an advantageous further development, the swivel joint is designed as a bush bearing or as a torsionally soft rubber bearing.

[0027] The bushing bearing enables pivoting or rotating movement between the first spring body and the second spring body. It can essentially comprise a sleeve (bush) and a shaft or axle mounted therein. The bushing bearing can consist of or comprise various materials, with metals and / or plastics and / or composites with self-lubricating properties frequently being used. The design can enable low friction losses and, in many cases, easy maintenance and replaceability.

[0028] A torsionally soft rubber mount can respond flexibly to torsional movements, which can be particularly useful for damping vibrations and shocks. It consists of rubber or a rubber-like elastomer compound, which can often be embedded between two metal parts. These mounts can serve as connecting elements in vehicles by absorbing torsional movements without compromising the structural integrity of the system. The softness and elasticity of the material can allow vibrations and noise to be absorbed while maintaining freedom of movement.

[0029] In an advantageous further development, the second spring body comprises a recess, wherein a second part of the rotary joint is arranged in the recess, wherein the second part of the rotary joint is aligned with a surface of the second spring body or the second part of the rotary joint is designed as a U-profile and engages around the second spring body.

[0030] The first part of the pivot joint and the second part of the pivot joint can be pivotally connected to each other mechanically with a bolt. A pivoting movement of the first spring body can occur parallel to the second spring body via the pivot joint. Parallel means that the two longitudinal axes of the first spring body and the second spring body are in a plane perpendicular to the two spring bodies.

[0031] The invention also relates to a motor vehicle comprising a flexural spring according to at least one of the preceding developments. The invention is described below purely by way of example with reference to the drawings. They show: Fig. 1 a bending spring for a motor vehicle for lifting-roll decoupling; and Fig. 2 a bending spring for a motor vehicle for lifting-roll decoupling; and Fig. 3 a motor vehicle with the bending stroke spring; and Fig. 4 a bending spring for a motor vehicle for lifting-roll decoupling; and Fig. 5 a second spring body of the bending stroke spring; and Fig. 6 a first spring body of the bending stroke spring.

[0032] Fig. 1 shows a flexural spring 100 for a motor vehicle 300 for lift-roll decoupling. The flexural spring comprises a first spring body 110 and a second spring body 120, wherein the first spring body 110 has a first end 111 with a first coupling element 113 and a second end 112 with a second coupling element 114, wherein a pivot joint 130 is arranged on an upper side 115 of the first spring body 110 centrally between the first coupling element 113 and the second coupling element 114, wherein the second spring body 120 is mounted on the pivot joint 130, wherein the second spring body 120 is pivotable parallel to the first spring body 110 by means of the pivot joint 130. The first spring body 110 is designed as a leaf spring.

[0033] A first part 131 of the rotary joint 130 is mechanically connected to the first spring body 110 via at least two stud bolts 133.

[0034] The second spring body 120 is mounted on the first spring body 110. The second spring body 120 comprises a second part 132 of the pivot joint 130.

[0035] Fig. Figure 2 shows the flexural spring 100 for a motor vehicle 300 for heave-roll decoupling. The second spring body 120 is designed as a U-shaped profile and at least partially surrounds the first spring body 110.

[0036] The second spring body 120 comprises a recess, wherein a second part 132 of the rotary joint 130 is arranged in the recess, wherein the second part 132 of the rotary joint 130 is aligned with a surface 121 of the second spring body 120.

[0037] Fig. 3 shows a motor vehicle 300 with a chassis 200 which includes the bending stroke spring 100.

[0038] The first spring body 110 of the flexural spring 100 is tensioned during a lifting movement of the chassis 200, i.e., during a compression movement of the chassis 200. From a certain compression depth of the chassis 200, the second spring body 120 is brought into contact with the first spring body 110. As a result, a first bending characteristic curve of the first spring body 110 is added to a second bending characteristic curve of the second spring body 120, and the compression movement is more strongly cushioned.

[0039] The invention is not limited to the described embodiments. Within the scope of the invention, all described and / or illustrated features can be combined with one another in any way, unless otherwise stated.

[0040] Fig. 4 shows a flexural spring 100 for a motor vehicle 300 for lift-roll decoupling. The flexural spring comprises a first spring body 110 and a second spring body 120, wherein the first spring body 110 has a first end 111 with a first coupling element 113 and a second end 112 with a second coupling element 114, wherein a pivot joint 130 is arranged on an upper side 115 of the first spring body 110 centrally between the first coupling element 113 and the second coupling element 114, wherein the second spring body 120 is mounted on the pivot joint 130, wherein the second spring body 120 is pivotable parallel to the first spring body 110 by means of the pivot joint 130. The first spring body 110 is designed as a leaf spring.

[0041] A first part 131 of the pivot joint 130 is mechanically connected to the first spring body 110 via a bolt. The bolt runs transversely to the first spring body 110 and the second spring body 120.

[0042] The second spring body 120 is mounted on the first spring body 110. The second spring body 120 comprises a second part 132 of the pivot joint 130. The bolt connects the first part 131 of the pivot joint 130 and the second part 132 of the pivot joint 130.

[0043] Fig. 5 shows the second spring body 120 of the bending stroke spring 100 from Fig. 4. The second part 132 of the swivel joint 130 is designed as a U-profile and surrounds the second spring body 120.

[0044] Fig. 6 shows the first spring body 110 of the bending stroke spring 100 from Fig. 4. Wherein the first spring body 110 comprises the first end 111 with the first coupling element 113 and the second end 112 with the second coupling element 114, wherein the first part 131 of the rotary joint 130 is arranged on an upper side 115 of the first spring body 110 centrally between the first coupling element 113 and the second coupling element 114.

[0045] The invention is not limited to the described embodiments. Within the scope of the invention, all described and / or illustrated features can be combined with one another in any way, unless otherwise stated.

Claims

[1] Bending stroke spring (100) for a motor vehicle (300) for lifting-roll decoupling, comprising, a first spring body (110) and a second spring body (120), wherein the first spring body (110) comprises a first end (111) with a first coupling element (113) and a second end (112) with a second coupling element (114), wherein a rotary joint (130) is arranged on an upper side (115) of the first spring body (110) centrally between the first coupling element (113) and the second coupling element (114), wherein the second spring body (120) is mounted on the rotary joint (130), wherein the second spring body (120) is pivotable parallel to the first spring body (110) by means of the rotary joint (130), characterized by , that the second spring body (120) is designed as a U-profile, wherein the second spring body (120), which is designed as a U-profile, at least partially surrounds the first spring body (110). [2] Bending stroke spring (100) for a motor vehicle (300) for lifting-roll decoupling, according to claim 1, characterized in that a first part (131) of the rotary joint (130) is mechanically non-positively connected to the first spring body (110) via at least two stud bolts (133). [3] Bending stroke spring (100) for a motor vehicle (300) for lifting-roll decoupling, according to at least one of the preceding claims, characterized in that the first spring body (110) is designed as a leaf spring. [4] Bending stroke spring (100) for a motor vehicle (300) for lifting-roll decoupling, according to at least one of the preceding claims, characterized in that the first spring body (110) consists of or comprises GRP and / or consists of or comprises CFRP and / or that the second spring body (120) consists of or comprises titanium or consists of or comprises a fiber composite material. [5] Bending stroke spring (100) for a motor vehicle (300) for lifting-roll decoupling, according to at least one of the preceding claims, characterized in that the first spring body (110) is formed in two parts or in one part. [6] Bending stroke spring (100) for a motor vehicle (300) for lifting-roll decoupling, according to at least one of the preceding claims, characterized in that the rotary joint (130) is designed as a bushing bearing or as a torsionally soft rubber bearing. [7] Bending stroke spring (100) for a motor vehicle (300) for lifting-roll decoupling, according to at least one of the preceding claims, characterized in that the second spring body (120) comprises a recess, wherein a second part (132) of the rotary joint (130) is arranged in the recess, wherein the second part (132) of the rotary joint (130) is aligned with a surface (121) of the second spring body (120) or the second part (132) of the rotary joint (130) is designed as a U-profile and engages around the second spring body (120). [8] Motor vehicle (300), comprising a bending stroke spring (100) according to at least one of the preceding claims.

Images