Magnetorheological damper with built-in permanent magnet piston

Abstract

The utility model provides a magneto-rheological damper with a built-in permanent magnet piston, which comprises a piston rod, a permanent magnet ring, a magnetic isolation sheet, a permanent magnet piston, an excitation piston, an excitation coil, a floating piston, a damper cylinder body and the like, the permanent magnet ring is arranged on the lower surface of a left end cover of the damper, and the magnetic isolation sheet is arranged on the lower surface of the permanent magnet ring and is attached to the permanent magnet ring; an annular groove is machined in the piston rod, and the permanent magnet piston is tightly matched with the annular groove machined in the piston rod. A permanent magnet is arranged in the permanent magnet piston; an N pole of the permanent magnet ring is opposite to an N pole of the permanent magnet; when the piston rod is compressed, mutual exclusion resistance is generated by mutual exclusion magnetic fields between the permanent magnet rings and the permanent magnets, so that damping force is formed between the cavities I; the permanent magnet piston, the excitation piston and the floating piston divide the magneto-rheological damper with the built-in permanent magnet piston into four sealed cavities, the multiple sealed cavities provide multi-section buffering, the damping force of the device is effectively increased, and the magneto-rheological damper is particularly suitable for a damping system in the automobile industry.

Description

Technical Field

[0001] The utility model relates to a magnetorheological damper, in particular to a magnetorheological damper with a built-in permanent magnetic piston. Background Art

[0002] Magnetorheological dampers generate a damping force that is responsive and highly controllable. The magnetorheological fluid injected into the damper's sealed chamber transforms rapidly from a liquid to a semi-solid state under the influence of a magnetic field. Because this physical property transition is controlled by the magnetic field, it offers highly controllable properties. They hold great promise for development in the automotive shock absorption field.

[0003] The currently designed magnetorheological damper only has three sealed chambers formed by an excitation piston and a floating piston. There are fewer sealed chambers and the buffering effect is average. In addition, the current magnetorheological damper only has an excitation coil arranged inside the excitation piston, which forms a weak magnetic field and makes it difficult to fully exert the physical properties of the magnetorheological fluid inside the entire sealed chamber. In the field of automobile shock absorption, the main function is to enhance the shock absorption effect when encountering rough roads, that is, the damping effect when the magnetorheological damper is compressed. The currently designed magnetorheological damper has no obvious difference in the damping force when the piston rod is compressed and stretched, that is, the shock absorption effect in the field of automobile shock absorption is not outstanding.

[0004] Therefore, designing a magnetorheological damper with an effective structure, simple processing, large damping force when the piston rod is compressed, and easy to express the damping force is a prerequisite for further expanding the application of magnetorheological dampers in the field of automotive shock absorption. Utility Model Content

[0005] In order to overcome the problems existing in the background technology and meet the practical use requirements of magnetorheological dampers, the present invention proposes a magnetorheological damper with a built-in permanent magnet piston. A permanent magnet piston is added to the conventional damper piston, so that the magnetorheological damper with a built-in permanent magnet piston has three magnetorheological fluid sealed chambers, namely sealed chamber I, sealed chamber II and sealed chamber III. At the same time, an air-filled chamber IV is provided at the floating piston, which effectively increases the buffering level of the magnetorheological damper. Secondly, the permanent magnet placed in the permanent magnet piston and the permanent magnet ring form a mutually repulsive magnetic field. During the compression process of the magnetorheological damper, the mutually repulsive magnetic field generates a mutually repulsive damping force, which greatly enhances the damping effect of the magnetorheological damper. In terms of space utilization: the permanent magnet piston also greatly expands the control of the magnetic field inside the magnetorheological damper, achieving the effect of fully utilizing the physical properties of the magnetorheological fluid inside the sealed chamber during shock absorption; making the performance of the magnetorheological damper more stable and the dynamic adjustment range of the damping force larger; it is particularly suitable for shock absorption systems in the automotive industry.

[0006] The utility model discloses a magnetorheological damper with a built-in permanent magnet piston, which is characterized by comprising a piston rod (1), a sealing ring I (2), a screw I (3), a screw II (4), a sealing ring III (5), an excitation coil (6), an excitation piston (7), a screw III (8), a right end cover of the excitation piston (9), a nut (10), a floating piston (11), a sealing ring V (12), a right lifting ear (13), a right end cover of the damper (14), a screw IV (15), a sealing ring IV (16), a damper cylinder (17), a left end cover of the excitation piston (18), a sealing ring II (19), a permanent magnet (20), a permanent magnet piston (21), a magnetic isolation plate (22), a permanent magnet ring (23), a left end cover of the damper (24) and a left lifting ear (25). The left hanging ear (25) is processed with an internal thread, and the piston rod (1) is processed with an external thread. The piston rod (1) is tightly connected to the internal thread of the left hanging ear (25) through the processed external thread. The left end cover (24) of the damper is processed with a circular through hole. The piston rod (1) is clearance-fitted through the circular through hole processed by the left end cover (24) of the damper. The left end cover (24) of the damper is processed with a circular groove. The sealing ring I (2) is sealed through the circular groove processed by the left end cover (24) of the damper. The left end cover (24) of the damper is fixedly connected to the damper cylinder (17) by screw I (3). The permanent magnet ring (23) is placed on the lower surface of the left end cover (24) of the damper. The magnetic isolation plate (22) is placed on the lower surface of the permanent magnet ring (23). The piston rod (1) is processed with an annular groove. , the permanent magnet piston (21) is tightly fitted through the annular groove processed by the piston rod (1); the permanent magnet (20) is built into the permanent magnet piston (21); the permanent magnet piston (21) is processed with a circular groove, and the sealing ring II (19) is sealed with the damper cylinder (17) through the circular groove processed by the permanent magnet piston (21); the left end cover (18) of the excitation piston is fixedly connected to the excitation piston (7) through the screw II (4); the right end cover (9) of the excitation piston is fixedly connected to the excitation piston (7) through the screw III (8); the center of the left end face of the excitation piston (7) is processed with an internal thread hole; the piston rod (1) and the excitation piston (7) are fastened by threads; the outer surface of the right end of the excitation piston (7) is processed with an external thread; the excitation piston (7) and the nut (10) are screwed together. The floating piston (11) is placed below the excitation piston (7), and two circular grooves are processed on both sides of the floating piston (11). The sealing ring IV (16) is sealed with the damper cylinder (17) through the circular grooves processed on both sides of the floating piston (11); the right end cover (14) of the damper is tightly matched by the screw IV (15); the right end cover (14) of the damper is processed with a circular groove, and the sealing ring V (12) is sealed with the damper cylinder (17) through the circular groove processed on the right end cover (14); the right end of the right end cover (14) of the damper is processed with an external thread, and the right lifting ear (13) is processed with an internal thread. The right end cover (14) of the damper is fixedly connected with the internal thread processed by the external thread processed and the right lifting ear (13);A circular groove is machined inside the excitation piston (7), and the excitation coil (6) is placed in the circular groove machined inside the excitation piston (7); two leads of the excitation coil (6) pass through the lead groove in the excitation piston (7) and the corresponding lead hole in the left end cover (18) of the excitation piston, and are led out from the lead hole in the piston rod (1); the N pole of the permanent magnet ring (23) is opposite to the N pole of the permanent magnet (20), wherein the magnetic isolation plate (22) is made of magnetic isolation material, the excitation piston (7) is made of magnetic conductive material, and the remaining parts are all made of non-magnetic conductive material.

[0007] Compared with the background technology, the present invention has the following beneficial effects:

[0008] The magnetorheological damper of the utility model forms four sealed chambers by embedding a permanent magnetic piston (21) in a piston rod (1). The permanent magnetic piston (21) separates a sealed chamber I and a sealed chamber II, thereby increasing a buffer chamber, strengthening the buffer space of the damper when it is compressed, and greatly enhancing the damping effect.

[0009] The magnetorheological damper of the utility model forms a repulsive magnetic field with a permanent magnet ring (23) by placing a permanent magnet (20) inside a permanent magnet piston (21). When the magnetorheological damper is compressed, a repulsive damping force is formed between the repulsive magnetic fields, thereby effectively improving the damping effect.

[0010] Compared with traditional magnetorheological dampers, the damper of the utility model optimizes its internal structure without changing the space occupied by the magnetorheological damper, amplifies its effective magnetic field in the limited space inside the magnetorheological damper, and especially enhances the damping effect of the magnetorheological damper when it is compressed, making the damping adjustment range longer, and is particularly suitable for shock absorption systems in the automotive industry.

[0011] Among the parts used in the magnetorheological damper of the utility model, the magnetic isolation plate (22) is made of magnetic isolation material, the excitation piston (7) is made of magnetic conductive material, and the remaining parts are made of non-magnetic conductive material. This design can effectively ensure that the magnetic flux lines are distributed as concentratedly as possible in the sealed chamber I and the sealed chamber II, give full play to the effect of the magnetic field generated by the permanent magnet plate on the magnetorheological fluid, and effectively improve the working efficiency of the magnetorheological damper. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic structural diagram of the utility model.

[0013] Figure 2 This is a distribution diagram of magnetic flux lines of the permanent magnet sheet and the permanent magnet piston of the utility model.

[0014] Figure 3 It is a left view of the right end cover of the excitation piston of the utility model. DETAILED DESCRIPTION

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0016] like Figure 1 As shown, the utility model comprises: a piston rod (1), a sealing ring I (2), a screw I (3), a screw II (4), a sealing ring III (5), an excitation coil (6), an excitation piston (7), a screw III (8), an excitation piston right end cover (9), a nut (10), a floating piston (11), a sealing ring V (12), a right lifting ear (13), a damper right end cover (14), a screw IV (15), a sealing ring IV (16), a damper cylinder (17), an excitation piston left end cover (18), a sealing ring II (19), a permanent magnet (20), a permanent magnet piston (21), a magnetic isolation plate (22), a permanent magnet ring (23), a damper left end cover (24) and and a left hanging ear (25), wherein the permanent magnet piston (21), the excitation piston (7), and the floating piston (11) divide the interior of the damper into three magnetorheological fluid sealed chambers, namely, sealed chamber I, sealed chamber II, and sealed chamber III. At the same time, there is an air-filled sealed chamber IV at the floating piston (11), and the magnetorheological fluid is filled in the magnetorheological fluid sealed chamber. When the piston rod (1) is moved, the magnetic field generated by the permanent magnet (20) is also moved, changing the physical properties of the magnetorheological fluid acted upon by the magnetic field of the permanent magnet (20), changing the magnetorheological fluid from liquid to paste, and enhancing the damping force. The air-filled sealed chamber serves as a compensating sealed chamber of the floating piston (11) and has a buffering effect.

[0017] Figure 2 This is a diagram showing the internal magnetic flux distribution of the magnetorheological damper of the utility model. When the piston rod is compressed, its built-in permanent magnet piston is simultaneously driven to move toward the inner surface of the left end cover of the damper, thereby bringing the N pole of the permanent magnet and the N pole of the permanent magnet ring closer to each other, that is, the mutually repulsive magnetic fields approach each other. When the two mutually repulsive magnetic fields approach each other, a repulsive damping force is generated.

[0018] Figure 3 This is the right view of the right end cover of the excitation piston of the utility model, in which there are 4 waist-shaped through holes evenly arranged in the circumference, and internal threaded holes are processed in the four axial directions for tight connection with screws. The center is processed with an internal thread for tight connection with the piston rod, and the lead hole K is a lead hole.

Claims

1. A magnetorheological damper with a built-in permanent magnet piston, characterized in that: The invention comprises a piston rod (1), a sealing ring I (2), a screw I (3), a screw II (4), a sealing ring III (5), an excitation coil (6), an excitation piston (7), a screw III (8), a right end cover of the excitation piston (9), a nut (10), a floating piston (11), a sealing ring V (12), a right lifting ear (13), a right end cover of the damper (14), a screw IV (15), a sealing ring IV (16), a damper cylinder (17), a left end cover of the excitation piston (18), a sealing ring II (19), a permanent magnet (20), a permanent magnet piston (21), a magnetic isolation plate (22), a permanent magnet ring (23), a left end cover of the damper (24) and a left lifting ear (25); the left lifting ear (25) is processed with an internal thread, and the piston rod (1) is processed The damper has an external thread, and the piston rod (1) is tightly connected to the internal thread of the left hanging ear (25) through the processed external thread; the damper left end cover (24) is processed with a circular through hole, and the piston rod (1) is clearance-fitted through the circular through hole processed by the damper left end cover (24); the damper left end cover (24) is processed with a circular groove, and the sealing ring I (2) is sealed through the circular groove processed by the damper left end cover (24); the damper left end cover (24) is fixedly connected to the damper cylinder (17) through the screw I (3); the permanent magnet ring (23) is placed on the lower surface of the damper left end cover (24); the magnetic isolation plate (22) is placed on the lower surface of the permanent magnet ring (23); the piston rod (1) is processed with an annular groove, and the permanent magnet piston (21) is passed through the piston rod ( 1) The annular groove processed is tightly matched; the permanent magnet (20) is built into the permanent magnet piston (21); the permanent magnet piston (21) is processed with a circular groove, and the sealing ring II (19) is sealed with the damper cylinder (17) through the circular groove processed by the permanent magnet piston (21); the left end cover (18) of the excitation piston is fixedly connected to the excitation piston (7) by screw II (4); the right end cover (9) of the excitation piston is fixedly connected to the excitation piston (7) by screw III (8); the center of the left end face of the excitation piston (7) is processed with an internal thread hole; the piston rod (1) and the excitation piston (7) are fastened by threads; the outer surface of the right end of the excitation piston (7) is processed with an external thread; the excitation piston (7) is fastened by threads to the nut (10); The floating piston (11) is placed below the excitation piston (7). Two circular grooves are processed on both sides of the floating piston (11). The sealing ring IV (16) is sealed with the damper cylinder (17) through the circular grooves processed on both sides of the floating piston (11); the right end cover (14) of the damper is tightly matched by the screw IV (15); the right end cover (14) of the damper is processed with a circular groove, and the sealing ring V (12) is sealed with the damper cylinder (17) through the circular groove processed on the right end cover (14); the right end of the right end cover (14) of the damper is processed with an external thread, and the right lifting ear (13) is processed with an internal thread. The right end cover (14) of the damper is fixedly connected with the internal thread processed by the external thread processed by the right lifting ear (13);A circular groove is machined inside the excitation piston (7), and the excitation coil (6) is placed in the circular groove machined inside the excitation piston (7); two leads of the excitation coil (6) pass through the lead groove in the excitation piston (7) and the corresponding lead hole in the left end cover (18) of the excitation piston, and are led out from the lead hole in the piston rod (1); the N pole of the permanent magnet ring (23) is opposite to the N pole of the permanent magnet (20).

2. The magnetorheological damper with a built-in permanent magnet piston according to claim 1, characterized in that: The permanent magnet ring (23) and the permanent magnet (20) each form a magnetic field. Since the permanent magnet ring (23) and the permanent magnet (20) have opposite north poles, when the piston rod (1) is compressed, the permanent magnet ring (23) and the permanent magnet (20) approach each other, and a repulsive magnetic field is formed between the permanent magnet ring (23) and the permanent magnet (20), generating a repulsive damping force, thereby enhancing the damping effect generated by the damper when the piston rod is compressed.

3. The magnetorheological damper with a built-in permanent magnet piston according to claim 1, characterized in that: The permanent magnetic piston (21) separates the sealed chamber I and the sealed chamber II, thereby increasing the buffer chamber, strengthening the buffer space of the damper when it is compressed, and greatly enhancing the damping effect.

4. The magnetorheological damper with a built-in permanent magnet piston according to claim 1, characterized in that: The magnetic isolation plate (22) is made of magnetic isolation material, the excitation piston (7) is made of magnetic conductive material, and the remaining parts are all made of non-magnetic conductive material.

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