LMES suspension system

Abstract

The utility model discloses an LMES suspension system, belongs to the field of vehicle suspensions, and aims to improve the adjustment performance of the suspensions. Comprising a hydraulic shock absorber, a spring, a linear motor and a controller. The hydraulic shock absorber comprises a piston rod and an outer barrel structure which is arranged outside the piston rod in a sleeving mode and is vertically and movably matched with the piston rod. The linear motor comprises a stator and a rotor, and the stator and the rotor are movably matched in the vertical direction. Stators of the linear motors are connected with piston rods of the hydraulic shock absorbers, and the top ends of the piston rods are connected to an upper support of the vehicle body; a rotor of the linear motor is connected with an external cylinder structure of the hydraulic shock absorber, and the bottom end of the external cylinder structure is connected to a lower support used for being installed on a wheel. And the spring is arranged between the rotor of the linear motor and the upper support. The output force of the linear motor and the damping force of the hydraulic shock absorber are overlapped to form the output force of the suspension system, compared with a traditional suspension system, the adjusting performance of the suspension system is greatly improved, and the comfort performance of a vehicle is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of vehicle suspension, specifically is LMES suspension system. BACKGROUND

[0002] Vehicle suspension system as the key part of connecting vehicle body and wheel, its performance directly influences the comfort, the steering stability and the driving safety of vehicle. The traditional suspension system adopts the mode of the combination of mechanical spring and hydraulic shock absorber. When the automobile runs on the uneven road, the wheel passes the road bump, the hydraulic shock absorber forms the damping. The elastic deformation of mechanical spring buffers and absorbs the vibration of ground or vehicle, plays the role of damping. The traditional suspension system can relieve the road impact to a certain extent, but in the complex road condition, its regulating capacity is limited, is difficult to satisfy the growing vehicle performance demand. SUMMARY

[0003] The utility model aims at providing a kind of vehicle suspension system, improves suspension regulating performance, to improve the comfort performance of vehicle.

[0004] The utility model adopts technical scheme: LMES suspension system, including hydraulic shock absorber, spring, linear motor and controller;The hydraulic shock absorber includes piston rod and the outer tube structure of being sleeved on piston rod outer and being vertically movable with piston rod;The linear motor includes stator and rotor, and the stator and rotor are vertically movable;The stator of linear motor is connected with the piston rod of hydraulic shock absorber, and the top end of piston rod is connected to the upper support of vehicle body;The rotor of linear motor is connected with the outer tube structure of hydraulic shock absorber, and the bottom end of outer tube structure is connected to the lower support for installing to wheel;The spring is installed between the rotor of linear motor and upper support.

[0005] Further, the stator of linear motor includes inner shell and permanent magnet;The inner shell is the hollow structure of bottom end open, and is surrounded by shell side wall and shell top wall, and the anti-collision pad is arranged on the shell top wall of inner shell, and the center hole for accommodating piston rod is arranged in the center of shell top wall of inner shell;The permanent magnet is coated on the outer surface of shell side wall of inner shell;The rotor of linear motor includes outer shell, coil and sliding bearing, the coil is arranged on the inner surface of outer shell side wall, and the sliding bearing is arranged on the inner surface of coil;The sliding bearing is sleeved on the outer side of permanent magnet, and is vertically movable with the outer surface of permanent magnet.

[0006] Further, the outer shell of linear motor includes top section and bottom section in upper and lower, the top section is coaxial with bottom section, and the limiting step surface is formed between top section and bottom section, and the bottom end of coil is centered on the limiting step surface.

[0007] Further, the hydraulic damper is an internal valve damper, the piston rod is a hollow cylinder structure, the bottom end of the piston rod is connected with an internal valve, and a valve coil for connecting with a controller of the internal valve is led out from the hollow inner cavity of the piston rod; the external cylinder structure comprises an outer cylinder for storing hydraulic oil and an inner cylinder, the bottom end of the inner cylinder is connected with a compression valve and arranged in the outer cylinder, and the internal valve is arranged in the inner cylinder and in sliding fit with the internal valve.

[0008] Further, the lower support is connected to the bottom end of the outer cylinder through a connecting rod.

[0009] Further, a guide sleeve is arranged between the top of the inner cylinder and the outer wall of the piston rod.

[0010] Further, an oil seal is arranged between the top end of the inner cylinder and the outer wall of the piston rod, and an end cover is arranged between the top end of the outer cylinder and the outer wall of the piston rod.

[0011] Further, the hydraulic damper is a magneto-rheological damper, the external cylinder structure is an oil storage cylinder, the oil storage cylinder is filled with magneto-rheological fluid, the bottom end of the piston rod is connected with a magnetic flow coil mechanism and then inserted into the oil storage cylinder, and the oil storage cylinder is provided with a floating piston matched therewith, and the floating piston is located below the magnetic flow coil mechanism.

[0012] Further, a sealing guide mechanism is arranged between the top end of the oil storage cylinder and the outer wall of the piston rod.

[0013] The LMES suspension system disclosed by the utility model has the advantages that: the output force of the linear motor and the damping force of the hydraulic damper are superposed to form the output force of the LMES suspension system, compared with the traditional suspension system, the adjusting performance of the LMES suspension system disclosed by the utility model is greatly improved, specifically: the linear motor and the hydraulic damper are combined, the output force of the linear motor can be controlled to actively reduce vibration, the vibration and bump of the vehicle are effectively reduced, the comfort of riding is improved, and the vehicle structure is protected from damage; the relationship between the direction of the required control force and the direction of the relative motion speed is determined to determine whether the control force is output by the linear motor or the hydraulic damper, so that active control with the same effect at low power is realized; the linear motor and the hydraulic damper are mutually cooperative, even when the linear motor is invalid due to overheating and other reasons, the vehicle body can be effectively controlled by the hydraulic damper, the reliable suspension function is still maintained, and the safety is guaranteed. ACCREDITATION OF DRAWINGS

[0014] Figure 1 It is a structure schematic view of the LMES suspension system disclosed by the utility model;

[0015] Figure 2 It is a sectional view of the LMES suspension system when the hydraulic damper is an ECDC internal valve damper;

[0016] Figure 3 A cross-sectional view of the LMES suspension system when the hydraulic damper is a magnetorheological damper;

[0017] Figure 4 Cross-sectional view of the ECDC built-in valve damper;

[0018] Figure 5 This is a cross-sectional view of a magnetorheological vibration damper;

[0019] Figure 6 This is a cross-sectional view of a linear motor;

[0020] Figure 7 for Figure 6 A magnified view of part A.

[0021] In the diagram, the components are: hydraulic shock absorber 1, spring 2, locking nut 10, upper support 11, spring upper washer 12, piston rod 13, end cap 14, oil seal 15, guide sleeve 16, limiting pad 17, built-in valve 18, outer cylinder 19, inner cylinder 20, compression valve 21, connecting rod 22, lower support 23, controller 4, sealing guide mechanism 24, oil reservoir 25, magnetorheological coil mechanism 26, magnetorheological fluid 27, floating piston 28, linear motor 3, anti-collision pad 31, inner shell 32, permanent magnet 33, coil 34, sliding bearing 35, outer shell 36, top section 36A, limiting step surface 36B, bottom section 36C, and controller 4. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0023] In this specification, unless otherwise stated, the terms "vertical," "upper," "lower," "front," "back," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the appendix. Figure 2 The orientation or positional relationship shown is for the purpose of describing the present invention only, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0024] LMES suspension system, such as Figure 1As shown, including hydraulic shock absorber 1, spring 2, linear motor 3 and controller 4;The hydraulic shock absorber 1 includes piston rod 13 and the outer cylinder structure sleeved on the piston rod 13 and vertically movably matched with the piston rod 13;The linear motor 3 includes stator and rotor, the stator and rotor are vertically movably matched;The stator of linear motor 3 is connected with the piston rod 13 of hydraulic shock absorber 1, and the top end of piston rod 13 is connected to the upper support 11 of vehicle body;The rotor of linear motor 3 is connected with the outer cylinder structure of hydraulic shock absorber 1, and the bottom end of outer cylinder structure is connected to the lower support 23 for mounting to the wheel;The spring 2 is installed between the rotor of linear motor 3 and the upper support 11.

[0025] Wherein LMES is the abbreviation of Linear Motor Electromagnetic Suspension, which is linear motor electromagnetic suspension. The hydraulic shock absorber 1 can be ECDC shock absorber, magnetorheological shock absorber, non-adjustable conventional double-cylinder shock absorber or single-cylinder shock absorber, but is not limited to ECDC shock absorber, magnetorheological shock absorber, non-adjustable conventional double-cylinder shock absorber or single-cylinder shock absorber. The LMES suspension system disclosed in the utility model, the output force of linear motor 3 and the damping force of hydraulic shock absorber 1 are superposed, which constitutes the output force of the LMES suspension system. The spring 2 is a straight spring, which buffers and absorbs the vibration generated by the ground or vehicle through the elastic deformation of spring 2, and plays a damping role.

[0026] In the LMES suspension system disclosed in the utility model, the linear motor 3 is one of the core components, which controls the size and direction of the generated force by adjusting the magnetic flux, so as to realize the active control of the suspension system. When the current and the magnetic field of air gap interact, electromagnetic thrust is generated, which drives the rotor of linear motor 3 to move linearly, and then realizes the adjustment of the suspension. Figure 7As shown, the stator of the linear motor 3 comprises an inner shell 32 and permanent magnets 33. The inner shell 32 is a hollow structure with an open bottom, which is surrounded by a shell side wall and a shell top wall. The open bottom of the inner shell 32 is for the outer cylinder of the hydraulic shock absorber 1 to pass through. An anti-collision pad 31 is arranged on the shell top wall of the inner shell 32, which avoids the outer cylinder of the hydraulic shock absorber 1 from directly colliding with the top wall of the inner shell 32 of the linear motor 3 during the upward movement of the outer cylinder. A central hole is arranged in the center of the shell top wall of the inner shell 32, which is not only through the shell top wall of the inner shell 32, but also through the anti-collision pad 31 at the shell top wall, and is used for the piston rod 13 of the hydraulic shock absorber 1 to pass through. The permanent magnets 33 are coated on the outer surface of the shell side wall of the inner shell 32. The mover of the linear motor 3 comprises an outer shell 36, a coil 34 and a sliding bearing 35. The coil 34 is arranged on the inner surface of the side wall of the outer shell 36, and the sliding bearing 35 is arranged on the inner surface of the coil 34. The sliding bearing 35 is sleeved on the outer side of the permanent magnet 33 and vertically movably matched with the outer surface of the permanent magnet 33. The relative movement between the coil 34 and the permanent magnet 33 is realized by the sliding bearing 35 installed between the inner side of the coil 34 and the outer side of the permanent magnet 33, which not only meets the demand of linear motion, but also reduces the gap between the coil 34 and the permanent magnet 33, thereby reducing the size of the linear motor 3 and making the structure of the linear motor 3 more compact.

[0027] As Figure 7 shown, the outer shell 36 of the linear motor 3 comprises a top section 36A above and a bottom section 36C below. The top section 36A is coaxial with the bottom section 36C, and a limiting step surface 36B is formed between the top section 36A and the bottom section 36C, which is horizontally inwardly collected from the top section 36A to the bottom section 36C. The bottom end of the coil 34 is centered on the limiting step surface 36B. The limiting step surface 36B plays a limiting role at the bottom end of the coil 34 in the vertical direction, avoiding the coil 34 from falling vertically.

[0028] From the above embodiment, it can be seen that the hydraulic shock absorber 1 can be an ECDC shock absorber, a magnetorheological shock absorber, a non-adjustable conventional double-cylinder shock absorber or a single-cylinder shock absorber, etc. The built-in valve shock absorber and the magnetorheological shock absorber in the ECDC shock absorber are taken as examples for illustration as follows:

[0029] As Figure 2 and Figure 4As shown, when the hydraulic damper 1 is an internal valve damper, the piston rod 13 of the hydraulic damper 1 is a hollow cylinder structure, and the bottom end of the piston rod 13 is connected with the internal valve 18, and the valve coil of the internal valve 18 for connecting with the controller 4 is led out from the hollow inner cavity of the piston rod 13, that is, the valve coil of the internal valve 18 is led out from the hollow inner cavity of the piston rod 13 and then connected to the controller 4. The external cylinder structure includes an outer cylinder 19 for storing hydraulic oil and an inner cylinder 20, the bottom end of the inner cylinder 20 is connected with a compression valve 21 and arranged in the outer cylinder 19, and the internal valve 18 is arranged in the inner cylinder 20 and in sliding fit with the internal valve 18. The lower support 23 can be directly welded to the bottom end of the outer cylinder 19 or connected to the bottom end of the outer cylinder 19 through the connecting rod 22 according to actual needs.

[0030] When the piston rod 13 of the hydraulic damper 1 is retracted vertically in the external cylinder structure, the hydraulic oil in the cavity surrounded by the internal valve 18, the compression valve 21 and the inner cylinder 20 is compressed, at this time, the compression valve 21 is opened to allow part of the hydraulic oil to enter the low-pressure chamber inside the hydraulic damper 1, so as to adjust the compression resistance of the hydraulic damper 1. After the valve coil of the internal valve 18 is energized, the opening degree of the internal valve 18 can be changed according to the instruction of the controller 4, so as to adjust the flow rate of the hydraulic oil. The change of the flow rate of the hydraulic oil leads to the change of the damping force of the hydraulic damper 1, and then the real-time adjustment of the vehicle suspension system is realized. By adjusting the damping force of the hydraulic damper 1 in real time, the best damping effect can be provided according to different road conditions and driving conditions. When encountering bumpy road, the vibration from the road and the rebound of the spring can be greatly weakened, so that the vehicle body can be kept stable. When driving intensively, the damping of the suspension can be increased to provide sufficient support force, and the chassis response can be more rapid, so as to improve the handling of the vehicle.

[0031] In order to play a guiding role when the piston rod 13 moves relative to the inner cylinder 20, a guide sleeve 16 is arranged between the top of the inner cylinder 20 and the outer wall of the piston rod 13.

[0032] An oil seal 15 is arranged between the top end of the inner cylinder 20 and the outer wall of the piston rod 13, and the oil seal 15 plays a sealing role. An end cover 14 is arranged between the top end of the outer cylinder 19 and the outer wall of the piston rod 13, and the end cover 14 covers the top end of the outer cylinder 19 and plays a role of isolation and dust prevention.

[0033] A limiting pad 17 is sleeved on the bottom of the piston rod 13, and the limiting pad 17 is vertically arranged above the internal valve 18, which is used to limit the upper limit of the piston rod 13 moving upward vertically, so as to avoid the problem that the internal valve 18 is directly impacted by the guide sleeve 16 and the internal valve 18 is damaged.

[0034] As shown in FIG. 1, the hydraulic damper 1 includes a piston rod 13, a controller 4, an internal valve 18, an outer cylinder 19, an inner cylinder 20, a compression valve 21, a lower support 23, an oil seal 15, an end cover 14 and a limiting pad 17. Figure 3 and Figure 5As shown, when the hydraulic damper 1 is a magneto-rheological damper, the outer cylinder structure of the hydraulic damper 1 is an oil storage cylinder 25, and the oil storage cylinder 25 is filled with a magneto-rheological fluid 27. The piston rod 13 of the hydraulic damper 1 is a hollow cylinder structure, the bottom end of the piston rod 13 is inserted into the oil storage cylinder 25 after being connected to a magnetic flow coil mechanism 26, and the coil of the magnetic flow coil mechanism 26 is led out through the hollow inner cavity of the piston rod 13 and then connected to the controller 4. The oil storage cylinder 25 is provided with a floating piston 28 matched therewith, and the floating piston 28 is located below the magnetic flow coil mechanism 26.

[0035] After the coil of the magnetic flow coil mechanism 26 is energized, the current of the magnetic flow coil mechanism 26 can be changed according to the instruction of the controller 4, so as to change the viscosity of the magneto-rheological fluid 27, the magneto-rheological fluid 27 is an oil liquid containing magnetic powder, so as to adjust the resistance of the magneto-rheological fluid 27 flowing through the valve cavity in the magnetic flow coil mechanism 26. By adjusting the magnetic field strength, the purpose of adjustable damping force is achieved, and the real-time adjustment of the vehicle suspension system is realized. The electromagnetic adjustment is controlled by the controller 4, the response speed is fast, and the vibration can be responded in a very short time. The structure of the magneto-rheological damper is simpler, and the maintenance cost is lower.

[0036] In order to guide the movement of the piston rod 13, a sealing guide mechanism 24 is arranged between the top end of the oil storage cylinder 25 and the outer wall of the piston rod 13.

[0037] No matter whether the hydraulic damper 1 is an internal valve damper or a magneto-rheological damper, the spring upper pad 12 is installed on the upper support 11, the top end of the spring 2 is abutted against the spring upper pad 12, and the bottom end is abutted against the top end of the stator of the linear motor 3. In this way, the spring 2 is arranged on the top of the linear motor 3 in space, the spring 2 occupies a small space, and the structure of the LMES suspension system is more compact.

[0038] The control system in which the controller 4 is located comprises external sensors such as an acceleration sensor, a height sensor and an original vehicle sensor (a vehicle speed sensor, a radar, a camera and the like). These external sensors collect and analyze data. The control command after operation is transmitted to different positions of the damping system. The LMES suspension system disclosed in the utility model controls the size and direction of the force generated by adjusting the internal magnetic flux of the linear motor 3 according to the instruction signal of the controller 4, so as to output corresponding electromagnetic force and speed to actively control the suspension system. The action of the linear motor 3 will directly lead to the adjustment of the suspension parameters, such as the change of the stiffness, the damping coefficient and the vehicle body height of the suspension, so as to adapt to different driving conditions and road conditions. Thus, the LMES suspension system can have the following functions:

[0039] 1. Active damping function: When the linear motor 3 is energized, its output force is controlled to be a damping force, and the direction of the force is opposite to the resistance direction of the hydraulic shock absorber 1, thereby effectively reducing vehicle vibration and bumps. This active damping capability improves ride comfort and helps protect the vehicle structure from damage.

[0040] 2. Hybrid thrust function: Based on the relationship between the direction of the required control force and the direction of the relative motion speed, it determines whether the control force is output by the linear motor 3 or the hydraulic damper 1, thereby achieving active control with low power and the same effect.

[0041] 3. Variable resistance function: When the linear motor 3 is not powered, the output resistance of the damper is controlled by controlling the damping of the hydraulic damper 1 (ECDC, magnetorheological), which achieves low energy consumption vehicle body control, especially in conditions such as downhill, cornering, and handling stability.

[0042] 4. Lifting Function: The LMES suspension also features a short-term lifting function, which can raise or lower the vehicle to a certain height to adjust its overall posture. This not only improves the vehicle's appearance and stance but also increases its ground clearance, enhancing its ability to traverse complex terrain and obstacles.

[0043] 5. Safety features: Even if the linear motor 3 fails due to overheating or other reasons, the presence of the hydraulic shock absorber 1 can effectively control the vehicle body and maintain reliable suspension function.

[0044] In the description of this specification, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0045] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An LMES suspension system characterized by: The hydraulic shock absorber (1) comprises a piston rod (13) and an outer cylinder structure sleeved on the piston rod (13) and vertically movably connected with the piston rod (13); the linear motor (3) comprises a stator and a mover, and the stator and the mover are vertically movably connected; the stator of the linear motor (3) is connected with the piston rod (13) of the hydraulic shock absorber (1), and the top end of the piston rod (13) is connected with an upper support (11) of a vehicle body; the mover of the linear motor (3) is connected with the outer cylinder structure of the hydraulic shock absorber (1), and the bottom end of the outer cylinder structure is connected with a lower support (23) for mounting to a wheel; the spring (2) is mounted between the mover of the linear motor (3) and the upper support (11).

2. The LMES suspension system of claim 1, wherein: The stator of the linear motor (3) comprises an inner shell (32) and a permanent magnet (33); the inner shell (32) is a hollow structure with an open bottom, which is surrounded by a shell side wall and a shell top wall, a center hole for allowing the piston rod (13) to pass through is arranged at the center of the shell top wall of the inner shell (32), and a crash pad (31) is arranged on the shell top wall of the inner shell (32); the permanent magnet (33) is coated on the outer surface of the shell side wall of the inner shell (32); the mover of the linear motor (3) comprises an outer shell (36), a coil (34) and a sliding bearing (35), the coil (34) is arranged on the inner surface of the side wall of the outer shell (36), and the sliding bearing (35) is arranged on the inner surface of the coil (34); The sliding bearing (35) is sleeved on the outer side of the permanent magnet (33) and vertically movably connected with the outer surface of the permanent magnet (33).

3. The LMES suspension system of claim 2, wherein: The outer shell (36) of the linear motor (3) comprises a top section (36A) at the upper side and a bottom section (36C) at the lower side, the top section (36A) is coaxial with the bottom section (36C), a limiting step surface (36B) is formed between the top section (36A) and the bottom section (36C), and the bottom end of the coil (34) is centered on the limiting step surface (36B).

4. The LMES suspension system of claim 2 or 3, wherein: The hydraulic shock absorber (1) is an internal valve shock absorber, the piston rod (13) is a hollow cylinder structure, the bottom end of the piston rod (13) is connected with an internal valve (18), a valve coil of the internal valve (18) for connecting with the controller (4) is led out from the hollow inner cavity of the piston rod (13); the outer cylinder structure comprises an outer cylinder (19) for storing hydraulic oil and an inner cylinder (20), the bottom end of the inner cylinder (20) is connected with a compression valve (21) and arranged in the outer cylinder (19), and the internal valve (18) is arranged in the inner cylinder (20) and slidably connected with the internal valve (18).

5. The LMES suspension system of claim 4, wherein: The lower support (23) is connected to the bottom end of the outer cylinder (19) through a connecting rod (22).

6. The LMES suspension system of claim 4, wherein: A guide sleeve (16) is arranged between the top of the inner cylinder (20) and the outer wall of the piston rod (13).

7. The LMES suspension system of claim 4, wherein: An oil seal (15) is arranged between the top end of the inner cylinder (20) and the outer wall of the piston rod (13), and an end cover (14) is arranged between the top end of the outer cylinder (19) and the outer wall of the piston rod (13).

8. The LMES suspension system of claim 2 or 3, wherein: The hydraulic shock absorber (1) is a magneto-rheological shock absorber, an outer cylinder structure is an oil storage cylinder (25), the oil storage cylinder (25) is filled with magneto-rheological fluid (27), the piston rod (13) is inserted into the oil storage cylinder (25) after connecting a magnetic flow coil mechanism (26) at the bottom end; The oil storage cylinder (25) is provided with a floating piston (28) matched therewith, and the floating piston (28) is located below the magnetic flow coil mechanism (26).

9. The LMES suspension system of claim 8, wherein: A sealing guide mechanism (24) is arranged between the top end of the oil storage cylinder (25) and the outer wall of the piston rod (13).

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