Magnetorheological shock absorber for new energy vehicles with magnetorheological fluid E-type flow channel

Abstract

A magnetorheological shock absorber for new energy vehicles with a magnetorheological fluid E-type circulation channel includes a cylinder, a floating piston and a working piston; a plurality of circulation channels I uniformly distributed along the circumferential direction are provided on the working piston, and the circulation channel I axially penetrates the working piston; on the working piston, circulation channels II are radially provided on both sides of the coil, and the inner end of the circulation channel II is connected with the circulation channel I; on the working piston, a circulation channel III distributed along the axial direction is provided on the outer side of the circulation channel II, and the inner end of the circulation channel III is connected with the circulation channel II, and the outer end is connected with the oil chamber; there is a gap between the working piston and the cylinder to form a circulation channel IV; thus, the circulation channels I, II, III and IV form a circulation channel with an E-shaped cross section. The present invention increases the effective shear area and effective length of the magnetorheological fluid by arranging the E-type circulation channel on the working piston, thereby making the adjustment threshold of the damping force larger, and the structure is simple and easy to manufacture.

Description

Technical Field

[0001] The present invention relates to the technical field of dampers, and in particular to a magnetorheological shock absorber for new energy vehicles having an E-type magnetorheological fluid flow channel. Background Art

[0002] In recent years, the new energy vehicle industry has developed rapidly and has formed a considerable industrial scale, with a great trend of replacing traditional fuel vehicles. The biggest difference between new energy vehicles and traditional vehicles is that they use electric motors to drive the wheels, and the motors need power batteries. At present, the mainstream new energy vehicle products on the market generally have a range of 400-700KM, and the battery capacity is generally 60-100kwh. Due to the large capacity of the battery, the vehicle weight of mainstream new energy models is generally close to or more than 2 tons, and some even exceed 2.5 tons.

[0003] For new energy vehicles, driving range is a key indicator to measure their performance, and driving range is mainly determined by battery capacity. Therefore, it is necessary to leave as much space as possible in the chassis for installing power batteries. However, due to the large vehicle weight of new energy vehicles, the size of related components in the suspension system is also relatively large. This creates an obstacle to installing larger capacity batteries. Therefore, the relevant components need to be miniaturized.

[0004] Shock absorbers are key components in the automobile suspension system and largely determine the shock absorption ability of the automobile suspension. Magnetorheological shock absorbers can adjust the magnetic field strength by controlling the coil current to achieve the purpose of adjusting the damping force. At present, many mid-to-high-end models are equipped with magnetorheological shock absorbers. For new energy vehicles, due to the large weight of the vehicle, magnetorheological shock absorbers are required to have a large damping force output value and a large adjustable range of damping force. The effective damping length of traditional magnetorheological shock absorbers is limited (the length of the magnetorheological fluid flow direction perpendicular to the magnetic field path is the effective damping length). In order to obtain a larger damping force output value and a larger adjustable range of damping force, it is necessary to increase the number of coil turns to increase the magnetic field strength, which is not conducive to the miniaturization design of the shock absorber, and thus is not conducive to the improvement of the endurance of new energy vehicles. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention provides a magnetorheological shock absorber for new energy vehicles with a magnetorheological fluid E-type flow channel. By adopting a specific damping channel, the present invention has a larger maximum damping force output value and a damping force adjustment threshold than the magnetorheological damper of the prior art without increasing the number of coil turns, which is conducive to the miniaturization design of the product, thereby helping new energy vehicles to leave more chassis space for installing power batteries and improving vehicle endurance.

[0006] The technical solution of the present invention:

[0007] A magnetorheological shock absorber for new energy vehicles with a magnetorheological fluid E-type flow channel includes a cylinder, a floating piston and a working piston; one end of the cylinder is provided with a piston rod guide hole, and the other end is open and sealed by a cylinder head; the floating piston is slidably matched with the inner circumference of the cylinder and is sealed by a seal, and the inner space of the cylinder is divided into an air chamber and an oil chamber, the oil chamber is filled with magnetorheological fluid, and the air chamber is filled with an inert gas; the working piston is arranged in the oil chamber and is slidably matched with the inner circumference of the cylinder, and the outer end of the piston rod connected thereto extends out from the piston rod guide hole at the end of the cylinder; the piston rod is slidably matched with the piston rod guide hole and is sealed by a seal; an annular groove is provided on the working piston, and the annular groove A coil is provided in the shaped groove; a plurality of circulation channels I uniformly distributed along the circumferential direction are provided on the working piston, and the circulation channel I axially penetrates the working piston; on the working piston, circulation channels II are respectively provided radially on both sides of the coil, and the inner end of the circulation channel II is communicated with the circulation channel I; on the working piston, a circulation channel III distributed along the axial direction is provided on the outer side of the circulation channel II, and the inner end of the circulation channel III is communicated with the circulation channel II, and the outer end is communicated with the oil chamber; there is a gap between the working piston and the cylinder barrel to form a circulation channel IV; the outer end of the circulation channel II is communicated with the circulation channel IV; thus, the circulation channel I, the circulation channel II, the circulation channel III and the circulation channel IV form a circulation channel with an E-shaped cross section.

[0008] Compared with the prior art, the piston assembly of the automobile magnetorheological single-tube shock absorber of the present invention is provided with a specific E-type flow channel on the working piston. The E-type flow channel is composed of flow channel I, flow channel II, flow channel III and flow channel IV. When the magnetorheological fluid works under a magnetic field, the effective damping length is longer and the shear area is larger. Therefore, in the same magnetic field environment, the maximum damping force output value and the adjustment threshold of the damping force are larger than those of the magnetorheological shock absorber in the prior art, which is beneficial to the miniaturization design of the shock absorber product, thereby helping new energy vehicles to leave more chassis space for installing power batteries and improving the endurance of new energy vehicles.

[0009] As an optimization, in the aforementioned magnetorheological shock absorber for new energy vehicles with magnetorheological fluid E-type flow channel, the piston rod has three sub-sections that are stepped from the outer end to the inner end; the working piston is sleeved on the second sub-section of the piston rod, one end of the working piston is against the step surface on the piston rod, and the other end is fixed by a positioning clip. This design is structurally reliable, easy to manufacture, and simple and convenient to assemble; in addition, the stepped structure also plays a role in lightweighting.

[0010] As an optimization, in the aforementioned magnetorheological shock absorber for new energy vehicles with a magnetorheological fluid E-type flow channel, the inner end of the piston rod passes through the hole on the floating piston to form a sliding fit with the floating piston and is sealed by a seal. With this structure, the floating piston has a radial limit on the piston rod, which prevents the piston rod from radially shaking during operation.

[0011] As an optimization, in the aforementioned magnetorheological shock absorber for new energy vehicles with a magnetorheological fluid E-type flow channel, a spring is provided on the piston rod; one end of the spring abuts against the floating piston, and the other end abuts against the positioning spring. Thus, the spring can provide a part of the damping force, which can further increase the maximum damping force output value.

[0012] As an optimization, in the aforementioned magnetorheological shock absorber for new energy vehicles with magnetorheological fluid E-type flow channel, the cross section of the flow channel I is a quarter ring, the cross section of the flow channel II is a circle, and the cross section of the flow channel III is a circle; two flow channels I are provided on the working piston; and four E-type flow channels are evenly distributed in the circumferential direction on both sides of the coil, and on the same side of the coil, two E-type flow channels share one flow channel I, and the other two E-type flow channels share another flow channel I. With the above structure, the cross section of the flow channel I is larger, so that the magnetorheological fluid flow rate is larger during shock absorption, so that the automobile suspension using the magnetorheological shock absorber of the present invention is softer, and the ride comfort of the vehicle is better during shock absorption; at the same time, the design of two E-type flow channels sharing the flow channel I is conducive to reducing processing procedures and improving production efficiency.

[0013] As an optimization, in the aforementioned magnetorheological shock absorber for new energy vehicles with magnetorheological fluid E-type flow channel, a heat dissipation pipe is provided on the outer peripheral surface of the cylinder. This can improve the heat dissipation capacity of the shock absorber when it is working, and avoid the magnetorheological fluid from decreasing in viscosity due to excessive temperature when the vehicle passes through a long distance of potholes, thereby affecting the shock absorption effect.

[0014] As an optimization, in the aforementioned magnetorheological shock absorber for new energy vehicles with a magnetorheological fluid E-type flow channel, the interior of the heat dissipation pipe has a spirally arranged cooling channel, and the two ends of the cooling channel are respectively led out from the two ends of the heat dissipation pipe to form a cooling medium inlet and a cooling medium outlet. With a spiral cooling channel, the flow path of the cooling medium is longer, and sufficient heat exchange can be performed.

[0015] As an optimization, in the aforementioned magnetorheological shock absorber for new energy vehicles with a magnetorheological fluid E-type flow channel, a heat-conducting adhesive layer is provided between the inner circumference of the heat dissipation pipe and the outer circumference of the cylinder barrel. Providing a heat-conducting adhesive layer is conducive to improving heat exchange efficiency.

[0016] Preferably, in the aforementioned magnetorheological shock absorber for new energy vehicles having a magnetorheological fluid E-type flow channel, the inert gas may be nitrogen. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a cross-sectional view of a magnetorheological shock absorber for new energy vehicles having a magnetorheological fluid E-type flow channel according to the present invention;

[0018] Figure 2 yes Figure 1 A partial enlarged view of the

[0019] Figure 3 is a cross-sectional view of the working piston and part of the piston rod;

[0020] Figure 4 yes Figure 3 AA cross-section view in.

[0021] The symbols in the accompanying drawings are:

[0022] 1-cylinder barrel, 101-piston rod guide hole; 2-floating piston; 3-working piston, 31-circulation channel I, 32-circulation channel II, 33-circulation channel III; 4-cylinder head; 5-piston rod; 6-coil; 7-positioning retaining spring; 8-spring; 9-heat dissipation pipe, 91-cooling medium inlet, 92-cooling medium outlet; 10-circulation channel IV. DETAILED DESCRIPTION

[0023] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but is not intended to be limiting of the present invention. In the following embodiments, all that is not described in detail is conventional technical means or technical common sense in the art.

[0024] See also Figure 1-4The magnetorheological shock absorber for new energy vehicles with a magnetorheological fluid E-type flow channel of the present invention comprises a cylinder 1, a floating piston 2 and a working piston 3; one end of the cylinder 1 is provided with a piston rod guide hole 101, and the other end is open and sealed by a cylinder head 4; the floating piston 2 is slidably matched with the inner circumference of the cylinder 1 and is sealed by a seal, and the inner space of the cylinder 1 is divided into an air chamber and an oil chamber, the oil chamber is filled with magnetorheological fluid, and the air chamber is filled with an inert gas; the working piston 3 is arranged in the oil chamber and slidably matched with the inner circumference of the cylinder 1, and the outer end of the piston rod 5 connected thereto extends out from the piston rod guide hole 101 at the end of the cylinder 1; the piston rod 5 is slidably matched with the piston rod guide hole 101 and is sealed by a seal; different from the prior art, in the present invention: the working piston An annular groove is provided on the plug 3, and a coil 6 is provided in the annular groove; four circulation channels I31 are evenly distributed in the circumferential direction on the working piston 3, and the circulation channel I31 penetrates the working piston 3 axially; on the working piston 3, circulation channels II32 are respectively provided in the radial direction on both sides of the coil 6, and the inner end of the circulation channel II32 is connected with the circulation channel I31; on the working piston 3, a circulation channel III33 is provided in the axial direction on the outer side of the circulation channel II32, and the inner end of the circulation channel III33 is connected with the circulation channel II32, and the outer end is connected with the oil chamber; there is a gap between the working piston 3 and the cylinder barrel 1, forming a circulation channel IV10; thereby, the circulation channel I31, the circulation channel II32, the circulation channel III33 and the circulation channel IV10 form a circulation channel with an E-shaped cross-section.

[0025] Example (see Figure 1-4 ):

[0026] In this embodiment, the piston rod 5 has three sub-sections that are stepped from the outer end to the inner end; the working piston 3 is sleeved on the second sub-section of the piston rod 5, one end of the working piston 3 is against the step surface on the piston rod 5, and the other end is fixed by a positioning retaining spring 7.

[0027] In this embodiment, the inner end of the piston rod 5 passes through the hole on the floating piston 2 to form a sliding fit with the floating piston 2 and is sealed by a sealing member.

[0028] In this embodiment, a spring 8 is disposed on the piston rod 5 ; one end of the spring 8 abuts against the floating piston 2 , and the other end of the spring 8 abuts against the positioning clamping spring 7 .

[0029] In this embodiment, the cross-section of the circulation channel I31 is a quarter of a circle, the cross-section of the circulation channel II32 is a circle, and the cross-section of the circulation channel III33 is a circle; two circulation channels I31 are provided on the working piston; four E-type circulation channels are evenly distributed in the circumferential direction on both sides of the coil, and on the same side of the coil, two E-type circulation channels share one circulation channel I31, and the other two E-type circulation channels share another circulation channel I31.

[0030] In this embodiment, the outer circumference of the cylinder 1 is sleeved with a heat dissipation pipe 9. The interior of the heat dissipation pipe 9 has a spirally arranged cooling channel, and the two ends of the cooling channel are respectively led out from the two ends of the heat dissipation pipe 9 to form a cooling medium inlet 91 and a cooling medium outlet 92. A heat conductive adhesive layer is provided between the inner circumference of the heat dissipation pipe 9 and the outer circumference of the cylinder 1. The two ends of the heat dissipation pipe 9 are welded to the cylinder 1.

[0031] In this embodiment, the inert gas is nitrogen.

[0032] When working, the coil 6 is energized to generate a magnetic field. The magnetorheological fluid is affected by the magnetic field and changes from a Newtonian fluid without a magnetic field to a Bingham fluid under a strong magnetic field. The suspended particles in the magnetorheological fluid change from magnetic neutrality to strong magnetism, and interact with each other to transform into a macroscopic columnar structure, which instantly changes from a liquid to a viscoplastic body, and then the rheological properties change, showing mechanical properties similar to those of a solid. See Appendix Figure 1 When the piston rod 5 drives the working piston 3 to move from right to left, the working piston 3 will squeeze the magnetorheological fluid on the left side of the cavity, and then pass through the damping channel, the magnetorheological fluid will shear and flow, and generate damping force (when the shock absorber of the above embodiment is shockproof, the spring 8 also provides part of the damping force). The circulation channel I31, circulation channel II32, circulation channel III33 and circulation channel IV10 outside the coil 6 form a circulation channel with an E-shaped cross-section, which has a large shear area and effectively increases the effective length of the magnetic field passing vertically through the magnetorheological fluid, so that a larger damping force can be output, so that the shock absorber has both a larger maximum damping force output value and a larger damping force adjustment range. When the piston rod 5 drives the working piston 3 to perform a return motion from left to right, the working piston 3 will squeeze the magnetorheological fluid on the right side of the cavity, and then pass through the damping channel to complete the return stroke.

[0033] It should be pointed out that, although the magnetorheological damper of the present invention is developed to meet the needs of new energy vehicles, it is not limited to use in new energy vehicles, but can also be used in traditional fuel vehicles.

[0034] The above general description of the invention involved in this application and the description of its specific implementation methods should not be understood as limiting the technical solutions of the invention. Based on the disclosure of this application, those skilled in the art can add, reduce or combine the disclosed technical features in the above general description and / or specific implementation methods (including examples) without violating the constituent elements of the invention involved, to form other technical solutions within the scope of protection of this application.

Claims

1. A magnetorheological shock absorber for new energy vehicles having an E-type magnetorheological fluid flow channel, comprising a cylinder (1), a floating piston (2) and a working piston (3); one end of the cylinder (1) is provided with a piston rod guide hole (101), and the other end is open and sealed by a cylinder head (4); the floating piston (2) is slidably matched with the inner circumference of the cylinder (1) and is sealed by a sealing member, so that the inner space of the cylinder (1) is divided into an air chamber and an oil chamber, the oil chamber is filled with magnetorheological fluid, and the air chamber is filled with an inert gas; the working piston (3) is arranged in the oil chamber and is slidably matched with the inner circumference of the cylinder (1), and the outer end of the piston rod (5) connected thereto extends out from the piston rod guide hole (101) at the end of the cylinder (1); the piston rod (5) is slidably matched with the piston rod guide hole (101) and is sealed by a sealing member; Features: The working piston (3) is provided with an annular groove, in which a coil (6) is provided; the working piston (3) is provided with a plurality of circulation channels I (31) evenly distributed along the circumferential direction, the circulation channel I (31) axially penetrating the working piston (3); the working piston (3) is provided with circulation channels II (32) radially on both sides of the coil (6), the inner end of the circulation channel II (32) being in communication with the circulation channel I (31); the working piston (3) is provided with a plurality of circulation channels I (31) evenly distributed along the circumferential direction, the circulation channel I (31) axially penetrating the working piston (3); the working piston (3) is provided with a plurality of circulation channels II (32) radially on both sides of the coil (6), the inner end of the circulation channel II (32) being in communication with the circulation channel I (31); ) is provided with a circulation channel III (33) distributed along the axial direction on the outside, the inner end of the circulation channel III (33) is connected with the circulation channel II (32), and the outer end is connected with the oil chamber; there is a gap between the working piston (3) and the cylinder barrel (1), forming a circulation channel IV (10); the outer end of the circulation channel II (32) is connected with the circulation channel IV (10); thus, the circulation channel I (31), the circulation channel II (32), the circulation channel III (33) and the circulation channel IV (10) form a circulation channel with an E-shaped cross section; The cross section of the circulation channel I (31) is a quarter of a circle, the cross section of the circulation channel II (32) is a circle, and the cross section of the circulation channel III (33) is a circle; two circulation channels I (31) are provided on the working piston; and four E-type circulation channels are evenly distributed in the circumferential direction on both sides of the coil, and on the same side of the coil, two of the E-type circulation channels share one circulation channel I (31), and the other two E-type circulation channels share another circulation channel I (31).

2. The magnetorheological shock absorber for new energy vehicles with a magnetorheological fluid E-type flow channel according to claim 1, characterized in that: The piston rod (5) has three subsections that are stepped from the outer end to the inner end; the working piston (3) is sleeved on the second subsection of the piston rod (5), one end of the working piston (3) is in contact with the step surface on the piston rod (5), and the other end is fixed by a positioning clamping spring (7).

3. The magnetorheological shock absorber for new energy vehicles with a magnetorheological fluid E-type flow channel according to claim 2 is characterized in that: The inner end of the piston rod (5) passes through the hole on the floating piston (2) to form a sliding fit with the floating piston (2) and is sealed by a sealing member.

4. The magnetorheological shock absorber for new energy vehicles with a magnetorheological fluid E-type flow channel according to claim 3 is characterized in that: The piston rod (5) is provided with a spring (8); one end of the spring (8) abuts against the floating piston (2), and the other end abuts against the positioning clamping spring (7).

5. The magnetorheological shock absorber for new energy vehicles with a magnetorheological fluid E-type flow channel according to claim 4, characterized in that: The outer peripheral surface of the cylinder barrel (1) is sleeved with a heat dissipation pipe (9).

6. The magnetorheological shock absorber for new energy vehicles with a magnetorheological fluid E-type flow channel according to claim 5, characterized in that: The heat dissipation pipe (9) has a spirally arranged cooling channel inside, and two ends of the cooling channel are respectively led out from two ends of the heat dissipation pipe (9) to form a cooling medium inlet (91) and a cooling medium outlet (92).

7. The magnetorheological shock absorber for new energy vehicles with a magnetorheological fluid E-type flow channel according to claim 6, characterized in that: A heat-conducting adhesive layer is provided between the inner circumferential surface of the heat dissipation pipe (9) and the outer circumferential surface of the cylinder barrel (1).

8. The magnetorheological shock absorber for new energy vehicles with a magnetorheological fluid E-type flow channel according to claim 7, characterized in that: The inert gas is nitrogen.

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