Magnetorheological damper with self-oiling device

Abstract

The utility model discloses a magnetorheological damper with self -filling oil device mainly comprises piston rod, damper end cover, damper cylinder body, piston head end cover, floating piston, spring support, spiral spring, oil pump, oil tank, check valve and pressure sensor etc. Pressure sensor installs on the outer wall of damper cylinder body, is used for real -time monitoring magnetorheological hydraulic pressure. The oil tank is communicated with the damper cavity through the oil pump and pipeline, and the oil pump is started and stopped by the pressure sensor signal. The check valve is installed in the oil filling pipeline, which ensures the one-way flow of magnetorheological fluid. When the pressure sensor detects that the pressure in the cavity is lower than the threshold value, the oil pump is automatically started, and the magnetorheological fluid in the oil tank is supplemented into the damper to maintain the optimal working pressure. The utility model increases the closed loop oil filling system on the basis of the traditional magnetorheological damper, solves the leakage or performance decay problem after long-term use of magnetorheological fluid, significantly improves the maintenance-free reliability and service life of the damper, and is suitable for vehicle suspension, building shock absorption and other fields.

Description

Technical Field

[0001] This utility model relates to a magnetorheological damper, and more particularly to a magnetorheological damper with a self-lubricating oil supply device. Background Technology

[0002] Magnetorheological dampers are intelligent damping devices based on magnetorheological fluids. They adjust the damping force by applying an external magnetic field and are widely used in automotive suspensions, building vibration reduction, and wind turbine vibration control. However, in practical engineering applications, magnetorheological dampers often experience performance degradation after long-term operation due to oil leakage or volume changes, affecting their reliability and service life.

[0003] Current magnetorheological dampers employ sealed structures, such as O-rings and lip seals, to prevent magnetorheological fluid leakage. However, under long-term reciprocating motion, alternating high and low temperatures, or high-pressure conditions, the seals are prone to wear and aging, leading to slow oil leakage. For example, in automotive suspension systems, frequent piston rod movement accelerates seal wear, reducing the amount of oil inside the damper and affecting the precise control of the damping force. Furthermore, extreme temperatures, such as -40℃ to 120℃, can cause the sealing material to shrink or expand, further exacerbating the risk of leakage. Currently, magnetorheological dampers are manually replenished, requiring periodic disassembly and replenishment of the magnetorheological fluid. This method is not only costly to maintain but also cannot respond to oil loss in real time, affecting system stability. Summary of the Invention

[0004] To overcome the problems existing in the background technology, this utility model proposes a magnetorheological damper with a self-replenishing oil device. A high-precision pressure sensor monitors the damping chamber pressure in real time, and automatically triggers an oil replenishment program when the detected oil pressure falls below a set threshold. An integrated micro-oil pump and oil tank replenish the main damping chamber with magnetorheological fluid via a one-way valve. The replenishment flow rate is intelligently adjustable to ensure precise pressure recovery. A floating piston and a helical spring work together to automatically balance oil volume fluctuations caused by temperature changes, maintaining stable system pressure. This design is particularly suitable for applications requiring long-term maintenance-free operation, such as automotive suspensions and wind power equipment.

[0005] A magnetorheological damper with a self-lubricating oil supply device is characterized by comprising: a left lifting lug, a piston rod, a left end cap of the damper, a damper cylinder, a left end cap of the piston head, an excitation coil, a right end cap of the piston head, a one-way valve, an oil pump, an oil tank, a floating piston, a right end cap of the damper, a right lifting lug, a right spring bracket, a helical spring, a left spring bracket, a fastening nut, a pressure sensor, and a piston head. The left lifting lug and the left end of the piston rod are fixedly connected by threads. The left end cap of the damper is fixedly connected to the damper cylinder by screws and sealed with a sealing ring. A circular through hole is machined in the middle of the left end cap of the damper. The piston rod is clearance-fitted with the inner surface of the circular through hole of the left end cap of the damper and sealed with a sealing ring. The left end cap of the piston head is machined with a central through hole, the inner surface of which is clearance-fitted with the outer surface of the right end of the piston rod. The left end cap of the piston head is fastened to the piston head by screws. The piston head and piston rod are fastened by threads. The right end cap of the piston head is fixed to the piston head by a fastening nut. The floating piston is clearance-fitted with the surface of the damper cylinder and sealed with a sealing ring. The left support of the spring is installed on the right side of the floating piston. One end of the helical spring is inserted into the left support of the spring, and the other end is inserted into the right support of the spring. The right support of the spring is installed on the right end cap of the damper. The left end cap of the piston head, the piston rod, and the left lifting lug are all machined with guides. The excitation coil leads are sequentially led out through the aforementioned lead holes. The right end cover of the damper is fixedly connected to the damper cylinder by screws and sealed by a sealing ring. An internal threaded hole is machined in the middle of the left end of the right lifting lug, and an external thread is machined on the right end cover of the damper. The right lifting lug and the right end cover of the damper are fastened together by the threads. The left end cover of the damper, the left end cover of the piston head, and the damper cylinder form a sealed cavity I. The right end cover of the piston head, the damper cylinder, and the floating piston form a sealed cavity II. The floating piston, the damper cylinder, and the right end cover of the damper form a sealed chamber III. The sealed chambers I and II are filled with magnetorheological fluid. The oil pump is connected to the inside of the damper cylinder. The oil pump inlet is connected to the oil tank, and the oil outlet is connected to the hydraulic chamber of the damper cylinder through a one-way valve. The one-way valve allows the hydraulic oil to flow in one direction and prevents backflow. The pressure sensor is installed on the outer wall of the damper cylinder to monitor the changes in hydraulic pressure inside the cylinder in real time.

[0006] Compared with the prior art, the advantages of this utility model are:

[0007] (1) This utility model designs a self-replenishing oil device, which is a self-replenishing closed-loop system consisting of an oil pump, an oil tank and a one-way valve. When the pressure inside the cavity is lower than the threshold, the oil pump automatically starts to replenish the magnetorheological fluid in the oil tank into the damper to maintain the optimal working pressure.

[0008] (2) By adding a pressure sensor, this utility model can continuously capture changes in oil pressure in real time, directly reflecting whether the oil volume is sufficient, thus avoiding the subjectivity and missed detection problems of manual monitoring. When the damper is leaking or vibrating, resulting in insufficient oil, the internal pressure will be lower than the preset threshold. The pressure sensor can immediately transmit the signal to the control system, triggering the oil pump to start replenishing oil.

[0009] (3) By setting a one-way valve, when the oil pump replenishes oil into the damper, the one-way valve only allows the oil to flow from the oil tank to the working chamber of the damper, preventing the oil from flowing back to the oil tank due to the pressure difference. This feature ensures that the replenished oil can remain stably in the working chamber, avoids the ineffective cycle of "replenishment-backflow", and ensures the accuracy of the replenishment amount. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of this utility model.

[0011] Figure 2 This is a schematic diagram of the structure of the self-lubricating device of this utility model. Detailed Implementation

[0012] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0013] like Figure 1 As shown, this utility model includes: a left lifting lug 1, a piston rod 2, a left end cover of the damper 3, a damper cylinder 4, a left end cover of the piston head 5, an excitation coil 6, a right end cover of the piston head 7, a one-way valve 8, an oil pump 9, an oil tank 10, a floating piston 11, a right end cover of the damper 12, a right lifting lug 13, a right spring bracket 14, a coil spring 15, a left spring bracket 16, a fastening nut 17, a pressure sensor 18, and a piston head 19.

[0014] The left lifting lug 1 and the left end of the piston rod 2 are fixedly connected by threads. The left end cover 3 of the damper is fixedly connected to the damper cylinder 4 by screws and sealed by a sealing ring. The left end cover 3 of the damper has a circular through hole in the middle. The piston rod 2 is clearance-fitted with the inner surface of the circular through hole of the left end cover 3 of the damper and sealed by a sealing ring. The left end cover 5 of the piston head has a central through hole, the inner surface of which is clearance-fitted with the outer surface of the right end of the piston rod 2. The left end cover 5 of the piston head is fastened to the piston head 19 by screws. The piston head 19 is fastened to the piston rod 2 by threads. The right end cover 7 of the piston head is fixedly connected to the piston head 19 by a fastening nut 17. The floating piston 11 is connected to the damper cylinder 4. The surface clearance fit is sealed by a sealing ring. The left spring bracket 16 is installed on the right side of the floating piston 11. One end of the helical spring 15 is inserted into the left spring bracket 16, and the other end is inserted into the right spring bracket 14. The right spring bracket 14 is installed on the right end cover 12 of the damper. The left end cover 5 of the piston head, the piston rod 2, and the left lifting lug 1 are all machined with lead wire holes. The lead wire of the excitation coil 6 is led out through the above lead wire holes in sequence. The right end cover 12 of the damper is fixedly connected to the damper cylinder 4 by screws and sealed by a sealing ring. The middle of the left end of the right lifting lug 13 is machined with an internal thread hole, and the right end cover 12 of the damper is machined with an external thread. The right lifting lug 13 and the right end cover 12 of the damper are fastened together by threads.

[0015] A sealed cavity I is formed between the left end cover 3 of the damper, the left end cover 5 of the piston head, and the damper cylinder 4. A sealed cavity II is formed between the right end cover 7 of the piston head, the damper cylinder 4, and the floating piston 11. A sealed cavity III is formed between the floating piston 11, the damper cylinder 4, and the right end cover 12 of the damper. The sealed cavities I and II are filled with magnetorheological fluid. The oil pump 9 is connected to the inside of the damper cylinder 4. The oil inlet of the oil pump 9 is connected to the oil tank 10, and the oil outlet is connected to the hydraulic cavity of the damper cylinder 4 through a one-way valve 8. The one-way valve 8 allows the hydraulic oil to flow in one direction and prevents backflow. The pressure sensor 18 is installed on the outer wall of the damper cylinder 4 to monitor the changes in hydraulic pressure inside the cylinder in real time.

[0016] Figure 2 This is a schematic diagram of the self-replenishing oil device of this utility model. It consists of an oil pump 9, an oil tank 10, and a one-way valve 8, forming a self-replenishing closed-loop system. The oil pump 9 is internally connected to the damper cylinder 4. The oil inlet of the oil pump 9 is connected to the oil tank 10, and the oil outlet is connected to the hydraulic chamber of the damper cylinder 4 via the one-way valve 8. When the pressure inside the chamber is lower than a threshold, the oil pump 9 automatically starts, replenishing the damper with magnetorheological fluid from the oil tank 10 to maintain the optimal working pressure. When the oil pump 9 replenishes oil into the damper, the one-way valve 8 only allows oil to flow from the oil tank 10 to the working chamber of the damper, preventing the oil from flowing back into the oil tank 10 due to pressure difference.

[0017] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A magnetorheological damper with a self-lubricating oil supply device, characterized in that... include: Left lifting lug (1), piston rod (2), damper left end cap (3), damper cylinder (4), piston head left end cap (5), excitation coil (6), piston head right end cap (7), one-way valve (8), oil pump (9), oil tank (10), floating piston (11), damper right end cap (12), right lifting lug (13), spring right bracket (14), coil spring (15), spring left bracket (16), fastening nut (17), pressure sensor (18), piston head (19). The left lifting lug (1) and piston rod (2) are fixedly connected by threads. The damper left end cap (3) and damper cylinder (4) are fixedly connected by screws and sealed by a sealing ring. The damper left end cap (3) is in the middle. The piston rod (2) is machined with a circular through hole, and the inner surface of the circular through hole of the left end cover (3) of the damper is clearance-fitted and sealed by a sealing ring. The left end cover (5) of the piston head is machined with a central through hole, and the inner surface of the central through hole is clearance-fitted with the outer surface of the right end of the piston rod (2). The left end cover (5) of the piston head and the piston head (19) are fastened together by screws. The piston head (19) and the piston rod (2) are fastened together by threads. The right end cover (7) of the piston head and the piston head (19) are fixedly connected by a fastening nut (17). The floating piston (11) is clearance-fitted with the surface of the damper cylinder (4) and sealed by a sealing ring. The left support bracket (16) of the spring is installed on the right side of the floating piston (11). The spiral spring One end of the spring (15) is inserted into the left spring bracket (16), and the other end is inserted into the right spring bracket (14). The right spring bracket (14) is installed on the right end cover (12) of the damper. The left end cover (5) of the piston head, the piston rod (2) and the left lifting lug (1) are all machined with lead wire holes. The lead wire of the excitation coil (6) is led out through the above lead wire holes in sequence. The right end cover (12) of the damper and the damper cylinder (4) are fixedly connected by screws and sealed by a sealing ring. The left end of the right lifting lug (13) is machined with an internal thread hole in the middle. The right end cover (12) of the damper is machined with an external thread. The right lifting lug (13) and the right end cover (12) of the damper are fastened together by threads. The left end cover (3) of the damper, the left end cover (5) of the piston head and the damper are all connected together. The cylinder body (4) forms a sealed cavity I, the piston head right end cover (7), the damper cylinder body (4) and the floating piston (11) form a sealed cavity II, the floating piston (11), the damper cylinder body (4) and the damper right end cover (12) form a sealed cavity III, the sealed cavity I and the sealed cavity II are filled with magnetorheological fluid, the oil pump (9) is connected to the inside of the damper cylinder body (4), the oil inlet of the oil pump (9) is connected to the oil tank (10), and the oil outlet is connected to the hydraulic cavity of the damper cylinder body (4) through the one-way valve (8). The one-way valve (8) allows the hydraulic oil to flow in one direction and prevents backflow. The pressure sensor (18) is installed on the outer wall of the damper cylinder body (4) to monitor the hydraulic pressure changes inside the cylinder body in real time.

2. A magnetorheological damper with a self-lubricating oil supply device according to claim 1, characterized in that: The self-replenishing closed-loop system consisting of oil pump (9), oil tank (10) and check valve (8) automatically starts when the pressure inside the chamber is lower than the threshold, replenishing the magnetorheological fluid in the oil tank (10) into the damper to maintain the optimal working pressure.

3. A magnetorheological damper with a self-lubricating oil supply device according to claim 1, characterized in that: By adding a pressure sensor (18), when the damper is leaking or vibrating and the oil is insufficient, the internal pressure will be lower than the preset threshold. The pressure sensor (18) can immediately transmit the signal to the control system and trigger the oil pump (9) to start replenishing oil.

4. A magnetorheological damper with a self-lubricating oil supply device according to claim 2, characterized in that: By setting a check valve (8), when the oil pump (9) replenishes oil to the inside of the damper, the check valve (8) only allows the oil to flow from the oil tank (10) to the working chamber of the damper, preventing the oil from flowing back to the oil tank (10) due to the pressure difference.

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