Electric vehicle suspension and electric vehicle

Abstract

The present invention discloses an electric vehicle suspension and an electric vehicle. The electric vehicle suspension includes: a wheel hub motor, the wheel hub motor is arranged on the inner side of the wheel rim; a first spring and damper assembly, one end of the first spring and damper assembly is mechanically connected to the wheel hub motor; the other end of the first spring and damper assembly is connected to the vehicle body; at least two battery tuned mass dampers, the battery tuned mass dampers are located on both sides of the vehicle body and above the wheels; one end of the battery tuned mass damper is mechanically connected to the unsprung part of the vehicle, and the other end of the battery tuned mass damper is connected to the vehicle body. The suspension structure proposed in this embodiment can suppress the vibration of the unsprung structure, reduce the vibration amplitude of the unsprung structure, reduce the vehicle bumps, reduce the impact of the increase in the unsprung mass of the vehicle, improve the vertical dynamic performance, ride comfort and road operability of the vehicle, and reduce the dynamic load of the vehicle tires.

Description

Technical Field

[0001] The present invention relates to the field of automobile technology, and in particular to an electric vehicle suspension and an electric vehicle. Background Art

[0002] Compared with traditional internal combustion engine vehicles, new energy vehicles are more environmentally friendly and energy-saving, so they have attracted people's attention. Compared with traditional internal combustion engine vehicles, the power source of new energy vehicles has been changed from gasoline engines to electric motors. In-wheel motors have the advantages of compact structure, high power transmission efficiency, saving vehicle chassis space, and reducing vehicle weight. Therefore, they have attracted much attention in electric vehicles.

[0003] However, since the hub motor is installed inside the wheel, the unsprung mass of the vehicle increases, which affects the working state of the vehicle suspension and makes the vibration filtering effect of the suspension irrational, thereby deteriorating the driving comfort and road handling of the vehicle. Summary of the invention

[0004] The invention provides an electric vehicle suspension and an electric vehicle, so as to solve the influence of the increase of the unsprung mass of the vehicle on the driving comfort and road operability of the vehicle.

[0005] According to one aspect of the present invention, there is provided an electric vehicle suspension, comprising:

[0006] A wheel hub motor, wherein the wheel hub motor is arranged on the inner side of the wheel rim;

[0007] A first spring and damper assembly, one end of the first spring and damper assembly is mechanically connected to the wheel hub motor; the other end of the first spring and damper assembly is connected to the vehicle body;

[0008] At least two battery tuned mass dampers, the battery tuned mass dampers use the battery as a mass block, the battery tuned mass dampers are located on both sides of the vehicle body and above the wheels; one end of the battery tuned mass damper is mechanically connected to the unsprung part of the vehicle, and the other end of the battery tuned mass damper is connected to the vehicle body.

[0009] Optionally, the battery tuned mass damper comprises a battery mass portion and a second spring and damper assembly;

[0010] Wherein, one end of the second spring and damper assembly is mechanically connected to the unsprung portion of the vehicle, and the other end of the second spring and damper assembly is mechanically connected to the battery mass portion.

[0011] Optionally, the first spring and damper assembly includes a first spring and a first damper connected in parallel; and the second spring and damper assembly includes a second spring and a second damper connected in parallel.

[0012] Optionally, the battery mass portion is located on both sides of the longitudinal axis of the vehicle body.

[0013] Optionally, the battery mass portion includes a battery structure and a tuned mass damper shaft, the battery structure is mechanically connected to the second spring and damper assembly, and the tuned mass damper shaft is connected between the battery structure and the vehicle body.

[0014] Optionally, the other end of the second spring and damper assembly is pivotally connected to the battery structure.

[0015] Optionally, the unsprung portion comprises: a suspension upper arm, a suspension finger joint and a suspension lower arm connected in sequence;

[0016] Wherein, the suspension finger joint is mechanically connected to the wheel hub motor, and the battery tuned mass damper is mechanically connected to the suspension lower arm.

[0017] Optionally, one end of the first spring and damper assembly is mechanically connected to the suspension lower arm; the other end of the first spring and damper assembly is mechanically connected to the chassis pivot.

[0018] Optionally, the vehicle body is a chassis.

[0019] According to another aspect of the present invention, there is provided an electric vehicle, comprising: a vehicle body and the electric vehicle suspension described in any one of the above embodiments.

[0020] According to the technical solution of the embodiment of the present invention, the suspension structure in which the wheel hub motor 110 is connected with the first spring and damper assembly 120 and the battery tuned mass damper 150 can effectively filter the vibration generated when the vehicle is driving. When the unsprung structure of the vehicle vibrates, the battery tuned mass damper 150 generates an inertial force in the opposite direction of the vibration of the unsprung structure, and applies the reverse inertial force to the unsprung structure, thereby suppressing the vibration of the unsprung structure, reducing the vibration amplitude of the unsprung structure, and reducing the vehicle bumps. The first-order estimation result shows that the suspension structure of this embodiment reduces the root mean square value of the vertical acceleration of the vehicle body by 20%, the root mean square value of the pitch acceleration of the center of gravity of the vehicle body by 40%, and the dynamic load of the tire by 4.5% under random road excitation. Therefore, this embodiment can reduce the impact of the increase in the unsprung mass of the vehicle, improve the vertical dynamic performance, ride comfort and road operability of the vehicle, and reduce the dynamic load of the vehicle tire 130.

[0021] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 is a structural schematic diagram of an electric vehicle suspension provided by an embodiment of the present invention;

[0024] Figure 2 is a schematic diagram of the structure of the exterior of an electric vehicle suspension provided by an embodiment of the present invention;

[0025] Figure 3 It is a schematic structural diagram of another electric vehicle suspension provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0026] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0027] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0028] Figure 1 1 is a schematic diagram of the structure of an electric vehicle suspension provided by an embodiment of the present invention. The electric vehicle suspension comprises:

[0029] The wheel hub motor 110 is arranged on the inner side of the wheel rim 130;

[0030] A first spring and damper assembly 120, one end of the first spring and damper assembly 120 is mechanically connected to the wheel hub motor 110; the other end of the first spring and damper assembly 120 is mechanically connected to the vehicle body 140;

[0031] At least two battery tuned mass dampers 150 are provided, and the battery tuned mass dampers 150 are located on both sides of the vehicle body 140 and above the wheels; one end of the battery tuned mass damper 150 is mechanically connected to the unsprung part of the vehicle, and the other end of the battery tuned mass damper 150 is connected to the engine room of the vehicle.

[0032] Specifically, the automobile damper is a device that uses damping characteristics to slow down mechanical vibration and consume kinetic energy. It can quickly attenuate the vibration of the frame and the body, and improve the smoothness and comfort of the car. It should be noted that the automobile suspension in this embodiment includes a first spring and damper assembly 120 and a battery tuned mass damper 150. The first spring and damper assembly 120 and the battery tuned mass damper 150 are both mechanically connected to the hub motor 110. Exemplarily, the first spring and damper assembly 120 and the battery tuned mass damper 150 can be mechanically connected to the hub motor 110 through the suspension finger joint. The first spring and damper assembly 120 and the battery tuned mass damper 150 are used to slow down the vibration caused by road excitation when the vehicle is driving, and disperse the vibration through the vehicle body 140 to each first spring and damper assembly 120 and the battery tuned mass damper 150 equipped on the vehicle. The wheel hub motor 110 is arranged on the inner side of the wheel rim 130 and connected thereto, but placing the motor in the wheel hub will increase the unsprung mass of the vehicle. In the prior art, the automotive industry has adopted the design of in-wheel motor suspension to balance driving comfort and road handling. However, since the in-wheel motor suspension transmits vehicle power through a flexible transmission structure, there is power loss during the vehicle power transmission process, and the transmission efficiency is low; and since the in-wheel motor suspension is a suspension structure arranged in the wheel, such a design further increases the unsprung mass of the vehicle. Since the ratio of the sprung mass to the unsprung mass of a car has a greater impact on the vibration of the car, the larger the ratio, the smaller the vibration of the car when passing through a bumpy road section. Therefore, the increase in the unsprung mass of the car will have a serious impact on the driving comfort and road handling of the vehicle.

[0033] The suspension structure in which the wheel hub motor 110 is connected with the first spring and damper assembly 120 and the battery tuned mass damper 150 adopted in this embodiment can effectively filter the vibration generated when the vehicle is driving. When the unsprung structure of the vehicle vibrates, the battery tuned mass damper 150 generates an inertial force in the opposite direction of the vibration of the unsprung structure, and applies the reverse inertial force to the unsprung structure, thereby suppressing the vibration of the unsprung structure, reducing the vibration amplitude of the unsprung structure, and reducing the vehicle bumps. The first-order estimation result shows that the suspension structure of this embodiment reduces the root mean square value of the vertical acceleration of the center of gravity of the vehicle body by 20%, the root mean square value of the pitch acceleration of the center of gravity of the vehicle body by 40%, and the dynamic load of the tire by 4.5% under random road excitation. Therefore, this embodiment can reduce the impact of the increase in the unsprung mass of the vehicle, improve the vertical dynamic performance, ride comfort and road operability of the vehicle, and reduce the dynamic load of the vehicle tire 130.

[0034] Optionally, based on the above embodiment, the battery tuned mass damper 150 includes a battery mass portion 160 and a second spring and damper assembly 170;

[0035] Among them, one end of the second spring and damper assembly 170 is mechanically connected to the unsprung part of the vehicle, and the other end of the second spring and damper assembly 170 is mechanically connected to the battery mass part 160.

[0036] Specifically, the tuned mass damper consists of a mass, a spring, and a damping system. When the tuned mass damper is connected to the main structure to be protected as a substructure, the tuned mass damper will try to get close to the natural frequency or excitation frequency of the main structure. In this way, when the main structure is excited and vibrates, the substructure will generate an inertial force in the opposite direction of the vibration of the main structure, which will act on the main structure, attenuating the vibration response of the main structure, thereby achieving the effect of vibration reduction. Figure 1 The battery mass unit 160 is composed of a battery structure, and the battery tuned mass damper 150 combines the battery mass unit 160 with the second spring and damper assembly 170. The battery mass unit 160 is used as the mass of the battery tuned mass damper 150. There is no need to additionally set up a mass of the tuned mass damper, which is equivalent to subtracting the mass of the mass in the tuned mass damper. The battery mass unit 160 is arranged on the upper end of the second spring and damper assembly 170 and is connected thereto, and due to the design of combining the battery mass unit 160 with the tuned mass damper, the battery structure and the tuned mass damper are arranged together outside the vehicle cabin. Such a design reduces the space occupied by the chassis and the combination of the two makes the vehicle design more modular. Such a setting not only reduces the weight of the vehicle body, but also expands the vehicle chassis space, which can make the vehicle design more flexible.

[0037] Optionally, the first spring and damper assembly 120 includes a first spring and a first damper connected in parallel; and the second spring and damper assembly 170 includes a second spring and a second damper connected in parallel.

[0038] Specifically, the first spring and the first damper in the first spring and damper assembly 120 are installed in parallel. The second spring and the second damper in the second spring and damper assembly 170 are installed in parallel. Exemplarily, the parallel installation of the spring and the damper may be to sheath the spring on the damper, or other forms of parallel installation, which are not limited in this embodiment.

[0039] When the vehicle bumps, the wheels are impacted, and the spring can convert the kinetic energy of the impact into deformation absorption. After absorbing the kinetic energy, the spring will deform multiple times, and the damper is used to reduce the number of spring deformations. In the compression stroke of the suspension, the damping force of the damper is small, and the elasticity of the spring can be fully utilized to mitigate the impact. In the extension stroke of the suspension, the damping force of the damper is large, and vibration can be quickly reduced. The arrangement of the spring and the damper installed in parallel can achieve a better vibration reduction effect. On the other hand, the parallel installation of the spring and the damper can save the space occupied by the automobile suspension. It should be noted that the above-mentioned spring includes the first spring in the first spring and damper assembly 120 and the second spring in the second spring and damper assembly 170, and the above-mentioned damper includes the first damper in the first spring and damper assembly 120 and the second damper in the second spring and damper assembly 170.

[0040] Optionally, based on the above embodiment, the battery mass unit 160 is located on both sides of the longitudinal axis of the vehicle body 140 .

[0041] For example, continue to refer to Figure 1 , the battery mass unit 160 can be arranged above the wheels of the vehicle. It should be noted that the battery mass unit 160 can be arranged above all the wheels of the vehicle, or only above the front or rear wheels of the vehicle, and this embodiment does not limit this. The battery mass unit 160 is arranged on the structure on both sides of the vehicle body, and the battery is moved to the outside of the vehicle, that is, part of the battery is moved outward. Such a design facilitates the combination of the battery mass unit 160 with the second spring and damper assembly 170, and the weight of the battery is used as the mass part of the tuned mass damper. There is no need to additionally set up the mass block of the tuned mass damper, and the weight of the car is reasonably configured to avoid adding extra weight to the car. Since the battery of the electric vehicle is arranged on the chassis of the vehicle, the design of moving part of the battery outward expands the chassis space of the vehicle, and due to the combination of the battery and the tuned mass damper, the weight of the vehicle is reduced.

[0042] Figure 2 1 is a schematic diagram of the structure of the exterior of an electric vehicle suspension provided by an embodiment of the present invention. Figure 1 and Figure 2 The battery mass unit 160 includes a battery structure that is mechanically connected to the second spring and damper assembly 170 , and a tuned mass damper shaft 220 that is connected between the vehicle body shell 210 and the vehicle body 140 .

[0043] Specifically, the second spring and damper assembly 170 is mechanically connected between the battery structure and the unsprung structure, and bears most of the weight of the battery structure. Exemplarily, the second spring and damper assembly 170 can be vertically installed between the unsprung structure and the battery structure. The battery mass unit 160 is connected to the body shell 210. It should be noted that the battery structure can have an independent shell structure, or the body shell 210 can be directly used as a battery shell, which is not limited in this embodiment. The tuned mass damper shaft 220 is used to connect the body shell 210 with the body 140. Most of the weight of the battery structure is borne by the second spring and damper assembly 170, and the remaining small part of the weight is transmitted to the tuned mass damper shaft 220 through the body shell 210 connected to the battery mass unit 160, and is borne by the tuned mass damper shaft 220. The battery mass unit 160 is mechanically connected to the second spring and damper assembly 170, and the two together constitute a battery tuned mass damper 150 after being connected. On the other hand, the battery tuned mass damper 150 is connected to the body shell 210, and the body shell 210 is connected to the body 140 through the tuned mass damper shaft 220. Such a structural setting also strengthens the connection between the battery tuned mass damper 150 and the body 140, and disperses the weight of the battery structure. The lower end of the body shell 210 near the cockpit and the positions near the tires on both sides of the body 140 are provided with openings, and a bearing structure is provided in the opening of the body 140. The tuned mass damper shaft 220 passes through the opening of the body 140 and the opening of the body shell 210. One end of the tuned mass damper shaft 220 is inserted into the bearing structure in the opening of the body 140, and the other end is fixedly connected to the body shell 210. Such a setting allows the body shell 210 to be rotated and opened in a small range around the tuned mass damper shaft 220, and the rotatable opening structure design of the body shell 210 provides convenience for the installation and maintenance of the vehicle suspension structure.

[0044] Optionally, the other end of the second spring and damper assembly 170 is pivotally connected to the battery structure.

[0045] Figure 3 Schematic diagram of another electric vehicle suspension provided by an embodiment of the present invention. Figure 3 , the unsprung part includes: a suspension upper arm 310, a suspension finger joint 320 and a suspension lower arm 330 connected in sequence;

[0046] Among them, the suspension finger joint 320 is mechanically connected to the hub motor 110, and the battery tuned mass damper 150 is mechanically connected to the suspension lower arm 330.

[0047] Specifically, the vehicle body 140 is mechanically connected to the suspension upper arm 310, the suspension upper arm 310 is mechanically connected to the suspension finger joint 320, and the suspension lower arm 330 is mechanically connected to the suspension finger joint 320. The battery tuned mass damper 150 is connected to the suspension lower arm 330, and is connected to the wheel hub motor 110 through the suspension lower arm 330. The wheel hub motor 110 is connected to the vehicle body 140 through the suspension lower arm 330. The vibration generated when the car is running is transmitted to the battery tuned mass damper 150 and the vehicle body 140 through the suspension lower arm 330. The battery tuned mass damper 150 vibrates under the influence of the transmitted vibration. At this time, the battery tuned mass damper 150 generates an inertial force to react to the unsprung structure, so that the vibration amplitude of the unsprung structure is reduced, and the structural comfort of the vehicle body 140 is improved. On the other hand, the wheel external suspension structure is simpler in structural setting than the in-wheel motor suspension structure, and the wheel external suspension requires fewer parts. Such a setting not only reduces the mass of the unsprung structure, but also reduces the number of automobile parts, improves the reliability of the automobile suspension, and is easy to implement. On the other hand, the wheel external suspension structure is arranged outside the wheel, which reduces the space occupied in the automobile wheel hub, provides space for the installation of the wheel hub motor, and reduces the complexity of the vehicle suspension.

[0048] Optionally, based on the above embodiment, continue to refer to Figure 3 One end of the first spring and damper assembly 120 is mechanically connected to the suspension lower arm 330; the other end of the first spring and damper assembly 120 is mechanically connected to the chassis pivot.

[0049] Specifically, the vibration generated when the car is driving is transmitted to the first spring and damper assembly 120 through the suspension lower arm 330. The first spring and damper assembly 120 assists the battery tuned mass damper 150 in filtering the vibration, thereby further improving the driving comfort. In addition, the structural setting in which the first spring and damper assembly 120 is mechanically connected between the suspension lower arm 330 and the chassis also strengthens the connection between the suspension lower arm 330 and the chassis.

[0050] Optionally, based on the above embodiment, the vehicle body 140 is a chassis.

[0051] It should be noted that the suspension structures in the above embodiments are all mechanically connected to the automobile chassis, which is an important part for supporting and installing various components of the automobile. In electric vehicles, the chassis also bears the role of loading batteries, and the vibrations generated during the driving of the car will be transmitted to the chassis. Therefore, reducing chassis vibration is particularly important for automobiles.

[0052] An embodiment of the present invention further provides an electric vehicle, which includes: a vehicle body 140 and the electric vehicle suspension of any of the above embodiments. The vehicle suspension setting in this embodiment overcomes the impact of the increase in the non-sprung mass of the vehicle on the vehicle, and provides a solution for the trade-off between the vehicle's ride comfort and road handling. Such a suspension setting can dynamically decouple the sprung mass and unsprung mass of the vehicle, and can control the independent vibration of the battery tuned mass damper 150, the first spring and the damper assembly 120 on the vehicle. Taking into account both the comfort of the vehicle's sprung mass and the vehicle's road handling can further improve the dynamic performance of the vehicle.

[0053] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0054] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An electric vehicle suspension, characterized in that: include: A wheel hub motor, wherein the wheel hub motor is arranged on the inner side of the wheel rim; A first spring and damper assembly, one end of the first spring and damper assembly is mechanically connected to the wheel hub motor; the other end of the first spring and damper assembly is connected to the vehicle body; At least two battery tuned mass dampers, the battery tuned mass dampers use the battery as a mass block, the battery tuned mass dampers are located on both sides of the vehicle body and above the wheels; one end of the battery tuned mass damper is mechanically connected to the unsprung part of the vehicle, and the other end of the battery tuned mass damper is connected to the vehicle body; the battery tuned mass damper includes a battery mass part and a second spring and damper assembly; Among them, one end of the second spring and damper assembly is mechanically connected to the unsprung part of the vehicle, and the other end of the second spring and damper assembly is mechanically connected to the battery mass part, the battery mass part includes a battery structure and a tuned mass damper shaft, the battery structure is mechanically connected to the second spring and damper assembly, and the tuned mass damper shaft is connected between the battery structure and the vehicle body, and the unsprung part includes: a suspension upper arm, a suspension finger joint and a suspension lower arm connected in sequence; wherein the suspension finger joint is mechanically connected to the wheel hub motor, the battery tuned mass damper is mechanically connected to the suspension lower arm, one end of the first spring and damper assembly is mechanically connected to the suspension lower arm; the other end of the first spring and damper assembly is mechanically connected to the chassis pivot.

2. The electric vehicle suspension according to claim 1, characterized in that: The first spring and damper assembly includes a first spring and a first damper connected in parallel; the second spring and damper assembly includes a second spring and a second damper connected in parallel.

3. The electric vehicle suspension according to claim 1, characterized in that: The battery mass portion is located on both sides of the longitudinal axis of the vehicle body.

4. The electric vehicle suspension according to claim 1, characterized in that: The other end of the second spring and damper assembly is pivotally connected to the battery structure.

5. The electric vehicle suspension according to claim 1, characterized in that: The vehicle body is a chassis.

6. An electric vehicle, characterized in that: include: A vehicle body and an electric vehicle suspension as claimed in any one of claims 1 to 5.

Images