A damper gap adjustable energy regenerative magneto-rheological damper

Abstract

The application discloses a kind of energy feedback type magnetorheological dampers with adjustable damping gap, including cylinder, end cover, ball, excitation coil, eccentric core, hollow shaft stepper motor, piston and piston rod;Magnetorheological fluid channel is located inside cylinder, excitation coil is fixed on eccentric core, the distance between coil and flow channel mouth is adjusted by hollow shaft stepper motor, on the basis of controlling damping force by current size, further increase the adjustable range of damping force.Piston rotor assembly and piston rod stator assembly are connected by bearing, spiral channel is provided on the outer wall of piston sleeve, which cooperates with the ball on the cylinder, and can convert reciprocating linear motion under external excitation into rotary motion, permanent magnet is provided in piston rotor assembly, coil winding is provided on piston rod stator assembly, and vibration energy collection is realized by the relative rotation between piston rotor assembly and piston rod stator assembly.

Description

TECHNICAL FIELD

[0001] The application relates to a feed-energy type magneto-rheological damper, in particular to a feed-energy type magneto-rheological damper with adjustable damping gap, and belongs to the technical field of automobile damping. BACKGROUND

[0002] With the progress of science and technology and the development of the automobile industry, consumers' requirements for vehicle comfort, controllability and safety are increasing. As a force transmission device between the frame and the axle, the suspension is an important part of modern vehicles, and it plays a crucial role in the performance of the vehicle.

[0003] In the prior art, the advantages of passive suspension are simple structure, stable performance and low manufacturing cost, but its disadvantages are also obvious, such as the damping coefficient and spring stiffness cannot be adjusted in real time according to the road conditions or vehicle speed, so it is difficult to meet people's requirements in terms of handling stability and ride comfort. Semi-active suspension is a new type of suspension system developed in recent years, which can adjust the output damping force in real time according to the driving conditions, thereby realizing precise control of the vehicle body movement.

[0004] However, in order to solve the problem of damping under different road conditions, the suspension needs to have a high damping force adjustment range. Magneto-rheological material is an intelligent material with fast response, easy control, low energy consumption and reversible change, which can realize rapid stepless damping force adjustment.

[0005] The magneto-rheological damper based on magneto-rheological fluid is the main damping component of semi-active suspension, which is the core of automobile damping, and has the advantages of simple structure, small size, continuous reversible operation, and can realize real-time semi-active control, which provides a strong condition for the optimization of vehicle semi-active suspension performance, and can greatly improve the ride comfort, controllability, comfort and safety of the vehicle.

[0006] Among the many technical fields of new energy vehicles, the vibration energy harvesting technology of the damper as an innovative energy utilization method has significant environmental and economic value. Not only can it effectively utilize vibration energy and improve energy utilization efficiency, but also can provide a new way for the power supply of new energy vehicles and reduce dependence on external power supply. Damping and energy feeding have broad application prospects in the field of new energy vehicles. SUMMARY

[0007] The application is proposed to solve the technical blank of the feed-energy type magneto-rheological damper for electric vehicles in the prior art, and a feed-energy type magneto-rheological damper with adjustable damping gap is provided, which not only has a high output damping force adjustment range, but also can convert linear vibration into rotary motion for energy collection, and has very high energy feeding efficiency.

[0008] The application achieves the above-mentioned purpose through the following technical scheme: a damping gap adjustable energy-feeding type magneto-rheological damper, comprising a cylinder;

[0009] Both ends of the cylinder are connected with end cover I and end cover II through screw I and screw II;

[0010] An eccentric core is installed in the cavity of the cylinder, and an excitation coil is installed on the eccentric core;

[0011] The eccentric core is fixedly connected with a connecting sleeve, a hollow shaft stepping motor is fixedly installed on the end cover I, and the connecting sleeve is in interference fit with the output shaft of the hollow shaft stepping motor and the inner ring of bearing I respectively;

[0012] A piston rotor assembly is installed in the cylinder and close to one side of the eccentric core, and the piston rotor assembly is in clearance fit with the cylinder;

[0013] A piston rod stator assembly is installed inside the piston rotor assembly through screw III, and the piston rod stator assembly passes through the hollow shaft stepping motor at the same time;

[0014] A connecting block and a mounting hinge hole are fixedly connected in sequence outside the end cover II.

[0015] As a further technical scheme of the application, the piston rotor assembly comprises piston end cover I, bearing mounting plate, piston sleeve, piston end cover II, permanent magnet N pole, permanent magnet S pole, bearing II and screw V;

[0016] The piston end cover I, bearing mounting plate, piston sleeve and piston end cover II are connected through screw V;

[0017] The permanent magnet N pole and the permanent magnet S pole are arranged inside the piston sleeve and are fixedly pressed through the bearing mounting plate;

[0018] The bearing II is installed on the bearing mounting plate.

[0019] As a further technical scheme of the application, the piston rod stator assembly comprises piston rod, core and coil winding;

[0020] The piston rod is in threaded connection with the core;

[0021] The coil winding is wound on the core;

[0022] The piston rod and screw III are in interference fit with the bearing II in the piston rotor assembly respectively.

[0023] As a further technical scheme of the present application: the spiral channel is arranged on the outer wall of the piston sleeve and cooperates with the ball arranged on the inner wall of the cylinder to convert the linear motion of the piston rod into the rotary motion of the piston sleeve, so that the piston rotor assembly rotates relative to the piston rod stator assembly.

[0024] The N-pole and S-pole of the permanent magnet in the piston rotor assembly cut the coil winding on the piston rod stator assembly and generate a magnetic field.

[0025] As a further technical scheme of the present application: the flow channel of the magneto-rheological fluid is arranged inside the cylinder, and the flow channel port is arranged on one side of the eccentric core.

[0026] The present application has the following beneficial effects:

[0027] 1) The flow channel of the magneto-rheological fluid is arranged inside the cylinder, the excitation coil generating a magnetic field is fixed on the end of the cylinder with the core, the core is eccentric, and the magnetic field size at the flow of the magneto-rheological fluid can be adjusted by the hollow shaft stepping motor, thereby increasing the adjustment range of the output damping force.

[0028] 2) The piston rotor assembly is provided with a spiral channel, and the linear motion of the piston rod can be converted into the rotary motion of the piston rotor assembly through the ball on the cylinder.

[0029] 3) The piston rotor assembly and the piston rod stator assembly are connected through a bearing, the piston rotor assembly is provided with a permanent magnet, the piston rod stator assembly is provided with a coil winding, and energy is collected through the relative rotary motion, so that the energy recovery efficiency is higher than that of the existing damper based on the linear power generation principle.

[0030] 4) The present application further increases the adjustment range of the controllable damping force by adding an eccentric core, and collects vibration energy according to the rotary power generation principle, fully utilizes the space inside the piston, and has a compact overall structure and high energy feeding efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is a sectional view of the present application;

[0032] Figure 2 is a left view of the present application;

[0033] Figure 3 is a structure diagram of the piston rotor assembly in the present application;

[0034] Figure 4 is a structure diagram of the piston sleeve in the present application;

[0035] Figure 5 is a structure diagram of the piston rod stator assembly in the present application;

[0036] Figure 6 is a structural schematic diagram of the core in the piston rod stator assembly of the present application;

[0037] Figure 7 is a structural schematic diagram of the eccentric core in the present application;

[0038] In the figure: 1, end cover I, 2, eccentric core, 3, cylinder, 4, piston rotor assembly, 5, ball, 6, piston rod stator assembly, 7, end cover II, 8, connecting block, 9, mounting hole, 10, hollow shaft stepping motor, 11, bearing I, 12, sealing ring I, 13, connecting sleeve, 14, excitation coil I, 15, screw I, 16, screw II, 17, sealing ring II, 18, sealing ring III, 19, sealing ring IV, 20, sealing ring V, 21, screw III,

[0039] 401, piston end cover I, 402, bearing mounting plate, 403, piston sleeve, 404, piston end cover II, 405, N-pole permanent magnet, 406, S-pole permanent magnet, 407, bearing II, 408, screw V,

[0040] 601, rod, 602, core, 603, coil winding. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0042] Embodiment one, as shown in Figure 1 and Figure 2 The present embodiment provides a damping gap adjustable energy feedback type magneto-rheological damper, which comprises a hollow cylinder 3.

[0043] The left end of the cylinder 3 is fixedly connected with the end cover I 1 through the screw I 15 and the screw II 16, and the right end of the cylinder 3 is fixedly connected with the end cover II 7 through the screw I 15 and the screw II 16, so that the cylinder 3 forms a closed cavity.

[0044] The eccentric core 2 is installed in the cavity of the cylinder 3 close to the end cover 11, and the excitation coil 14 is installed on the eccentric core 2.

[0045] The eccentric core 3 is fixedly connected (welded) with a connecting sleeve 13, and the end cover I1 is fixedly installed with a hollow shaft stepping motor 10, and the connecting sleeve 13 is in interference fit with the output shaft of the hollow shaft stepping motor 10 and the inner ring of the bearing I11 respectively;

[0046] A piston rotor assembly 4 is installed in the cylinder barrel 3 and close to one side of the eccentric core 2, and the piston rotor assembly 4 is in clearance fit with the cylinder barrel 3;

[0047] The piston rod stator assembly 6 is installed inside the piston rotor assembly 4 through the screw III21, and the piston rod stator assembly 6 passes through the hollow shaft stepping motor 10 at the same time;

[0048] The end cover II7 is fixedly connected (welded) with a connecting block 8 and a mounting hinge hole 9 in sequence outside.

[0049] It should be noted that a plurality of sealing rings are arranged at the shaft hole fit positions adjacent to the magnetorheological and magnetorheological liquid filling area, such as the sealing ring II17 arranged at the position where the end cover II7 is connected with the screw I15, the sealing ring III18 arranged at the position where the end cover II7 contacts with the cylinder barrel 3, the sealing ring IV19 arranged at the position where the cylinder barrel 3 contacts with the piston end cover II404, and the sealing ring V20 arranged at the position where the plug rod 601 contacts with the connecting sleeve 13, so as to prevent the magnetorheological liquid from leaking.

[0050] In the second embodiment, in addition to all the technical features of the first embodiment, the piston rotor assembly 4 comprises a piston end cover I401, a bearing mounting plate 402, a piston sleeve 403, a piston end cover II404, a permanent magnet N pole 405, a permanent magnet S pole 406, a bearing II407 and a screw V408. Figure 3

[0051] The piston end cover I401, the bearing mounting plate 402, the piston sleeve 403 and the piston end cover II404 are connected through the screw V408.

[0052] The permanent magnet N pole 405 and the permanent magnet S pole 406 are arranged inside the piston sleeve 403 and are fixedly pressed through the bearing mounting plate 402.

[0053] The bearing II407 is installed on the bearing mounting plate 402.

[0054] As shown in Figure 5 The piston rod stator assembly 6 comprises a piston rod 601, an iron core 602 and a coil winding 603; the piston rod 601 is in threaded connection with the iron core 602; the coil winding 603 is wound on the iron core 602; and the piston rod 601 and the screw III21 are in interference fit with the bearing II407 in the piston rotor assembly 4. Figure 6 ​As shown, the iron core 602 is provided with 8 slots, and the coil winding 603 is wound in the 8 slots, and the lead wire is led out of the damper through the hole in the piston rod 601.

[0055] In addition to comprising all the technical features in Embodiment One and Embodiment Two, the third embodiment further comprises, for example, Figure 4 As shown, the outer wall of the piston sleeve 403 is provided with a spiral channel, and cooperates with the ball 5 installed on the inner wall of the cylinder 3 (the ball can rotate), to convert the linear motion of the piston rod 601 into the rotary motion of the piston sleeve 403, so that the piston rotor assembly 4 rotates relative to the piston rod stator assembly 6.

[0056] The N-pole permanent magnet 405 and the S-pole permanent magnet 406 in the piston rotor assembly 4 cut the magnetic field generated by the coil winding 603 on the piston rod stator assembly 6, so as to realize energy collection.

[0057] The flow channel of the magneto-rheological fluid is arranged inside the cylinder 3, and the flow channel port is arranged on one side of the eccentric iron core 2; as shown, Figure 7 As shown, the relationship between the minimum radius R1 of the hole center distance from the outer circle of the eccentric iron core 2, the maximum radius R2, and the inner wall radius R3 of the cylinder 3 is: R1 < R2 < R3, the eccentric iron core 2 can control the rotation angle through the hollow shaft stepping motor 10, and then control the gap size between the coil and the inner wall of the cylinder 3, so as to control the magnetic field size and the flow at the gap, and increase the adjustable range of the output damping force.

[0058] Working process: the piston rod 601 in the piston rod stator assembly 6 is fixed on the automobile frame and can only move along the axis with vibration, and the hinge hole 9 is fixed on the suspension; when the damper is excited externally, the piston rotor assembly 4 and the piston rod stator assembly 6 synchronously reciprocate along the axis relative to the cylinder, extruding the magneto-rheological fluid to flow in the area, and the excitation coil generates a corresponding magnetic field according to the size of the input current, which can further control the distance between the excitation coil and the cylinder 3 through the hollow shaft stepping motor 10, to expand or reduce the output damping force; at the same time, when the piston rotor assembly 4 moves along the axis, it will rotate relative to the piston rod stator assembly 6 due to the action of the ball 5, and the permanent magnet in the piston rotor assembly 4 cuts the magnetic field generated by the coil winding in the piston rod stator assembly 6, thereby generating an induced current, to realize vibration energy recovery.

[0059] It will be obvious to a person skilled in the art that the application is not limited to the details of the foregoing exemplary embodiments and can be implemented in other concrete forms without departing from the spirit or essential characteristics of the application. The embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. No reference signs in the claims should be considered as limiting the scope of the claims to the identity of the reference signs therein.

[0060] Furthermore, it should be understood that although the description is made on the basis of the embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that those skilled in the art can understand.

Claims

1. A feed-type magnetorheological damper with adjustable damping gap, comprising a cylinder (3), characterized in that: The two ends of the cylinder (3) are connected to end cap I (1) and end cap II (7) by screw I (15) and screw II (16); An eccentric iron core (2) is installed in the cavity of the cylinder (3), and an excitation coil (14) is installed on the eccentric iron core (2). The eccentric iron core (2) is fixedly connected to a connecting sleeve (13), and a hollow shaft stepper motor (10) is fixedly installed on the end cover I (1). The connecting sleeve (13) is interference-fitted with the output shaft of the hollow shaft stepper motor (10) and the inner ring of the bearing I (11). A piston rotor assembly (4) is installed inside the cylinder (3) and on the side close to the eccentric iron core (2), and the piston rotor assembly (4) is clearance-fitted with the cylinder (3); The piston rod stator assembly (6) is mounted inside the piston rotor assembly (4) by screw III (21), and the piston rod stator assembly (6) passes through the hollow shaft stepper motor (10). The outer side of the end cap II (7) is sequentially fixed with a connecting block (8) and a mounting hinge hole (9). The flow channel of the magnetorheological fluid is located inside the cylinder (3), and the flow channel opening is located on one side of the eccentric iron core (2).

2. The energy-fed magnetorheological damper according to claim 1, characterized in that: The piston rotor assembly (4) includes a piston end cap I (401), a bearing mounting plate (402), a piston sleeve (403), a piston end cap II (404), a permanent magnet N pole (405), a permanent magnet S pole (406), a bearing II (407), and a screw V (408). The piston end cap I (401), bearing mounting plate (402), piston sleeve (403) and piston end cap II (404) are connected by screw V (408); The permanent magnet N pole (405) and permanent magnet S pole (406) are disposed inside the piston sleeve (403) and are pressed and fixed by the bearing mounting plate (402); The bearing II (407) is mounted on the bearing mounting plate (402).

3. The energy-fed magnetorheological damper according to claim 2, characterized in that: The piston rod stator assembly (6) includes a piston rod (601), an iron core (602), and a coil winding (603). The piston rod (601) and the iron core (602) are connected by threads; The coil winding (603) is wound around the iron core (602); The piston rod (601) and screw III (21) are respectively interference-fitted with bearing II (407) in piston rotor assembly (4).

4. The energy-fed magnetorheological damper according to claim 3, characterized in that: The piston sleeve (403) has a spiral channel on its outer wall and cooperates with the ball (5) installed on the inner wall of the cylinder (3) to convert the linear motion of the piston rod (601) into the rotational motion of the piston sleeve (403), so that the piston rotor assembly (4) rotates relative to the piston rod stator assembly (6). The permanent magnet N pole (405) and permanent magnet S pole (406) in the piston rotor assembly (4) cut the coil winding (603) on the piston rod stator assembly (6) and generate a magnetic field.

Images