阅读说明：本技术 双锥形非对称力磁流变阻尼器 (Biconical asymmetric force magnetorheological damper ) 是由 浮洁 梁慧君 王永盛 余淼 于 2021-10-18 设计创作，主要内容包括：本发明公开了一种双锥形非对称力磁流变阻尼器,包括阻尼筒和阻尼活塞,所述阻尼活塞外圆与阻尼筒内圆之间具有阻尼间隙,所述阻尼活塞呈上小下大的圆台形以使得阻尼间隙从下至上逐渐变大。本发明中不仅避免压缩力阻尼过大产生的反作用力对驾驶员造成的伤害,也可更多的缓存路面振动能；复原过程中,尽可能的将缓存的振动能通过复原力耗散；当车辆转弯时,车辆内外侧减振器受力不同,一侧受拉,一侧受压,拉压阻尼力不同,可提升车辆的转弯安全性；另外,该阻尼器的结构简单、体积较小、成本低廉,并且结合磁流变液阻尼力可变特性,实现较大的阻尼调节范围。(The invention discloses a biconical asymmetric force magneto-rheological damper which comprises a damping cylinder and a damping piston, wherein a damping gap is formed between the outer circle of the damping piston and the inner circle of the damping cylinder, and the damping piston is in a truncated cone shape with a small upper part and a large lower part so that the damping gap is gradually enlarged from bottom to top. The invention not only avoids the damage of the reaction force generated by overlarge compression force damping to the driver, but also can buffer the road surface vibration energy more; in the restoration process, the buffered vibration energy is dissipated through the restoration force as much as possible; when the vehicle turns, the shock absorbers on the inner side and the outer side of the vehicle are stressed differently, one side is pulled, the other side is pressed, the pulling and pressing damping forces are different, and the turning safety of the vehicle can be improved; in addition, the damper is simple in structure, small in size and low in cost, and combines the variable damping force characteristic of the magnetorheological fluid to achieve a large damping adjustment range.)

1. A biconical asymmetric force magneto-rheological damper is characterized in that: including damping cylinder and damping piston, the damping clearance has between damping piston excircle and the damping cylinder interior circle, the damping piston is big end down's round platform shape so that the damping clearance from supreme grow gradually down.

2. The double-tapered asymmetric-force magnetorheological damper of claim 1, wherein: the damping cylinder is axially, hermetically and slidably matched with the floating piston, and an air cavity is formed between the floating piston and the bottom of the damping cylinder.

3. The double-tapered asymmetric-force magnetorheological damper of claim 2, wherein: the damping cylinder comprises an inner cylinder and an outer cylinder sleeved outside the inner cylinder, an air storage cavity is arranged between the inner cylinder and the outer cylinder, and the inner cylinder is provided with an air hole which enables the air storage cavity to be communicated with the air cavity.

4. The double-tapered asymmetric-force magnetorheological damper of claim 3, wherein: the inner cylinder and the outer cylinder are coaxially arranged, and the radial gap between the inner circle of the inner cylinder and the outer circle of the outer cylinder is gradually enlarged from bottom to top so that the gas storage cavity forms a gradual change structure.

5. The double-tapered asymmetric-force magnetorheological damper of claim 4, wherein: the outer circle of the inner cylinder is a circular table top with a small upper part and a large lower part, and the inner circle of the outer cylinder is a cylindrical surface.

6. The double-tapered asymmetric-force magnetorheological damper of claim 5, wherein: the air hole is formed in the center of the bottom of the inner cylinder.

7. The double-tapered asymmetric-force magnetorheological damper of claim 1, wherein: and a magnetic coil is arranged outside the damping piston.

Technical Field

The invention relates to the technical field of damping devices, in particular to a biconical asymmetric force magneto-rheological damper.

Background

The vehicle running on the non-road condition usually has violent jolt, and is easy to generate violent vibration, so that the safety and the operation stability of the vehicle are seriously influenced, and the physical and psychological health of a driver is harmed; once the passive shock absorber leaves the factory, the parameters are determined, the corresponding damping force cannot be output according to the real-time working condition of the vehicle, and the actual requirements cannot be met. In this context, intelligent dampers are used. The magneto-rheological shock absorber is made out of the intelligent shock absorber by the advantages of excellent performance, high controllability, adjustable damping, low energy consumption and the like.

In order to fully exert the effect of the damping shock absorber, the damping force in the resetting process is required to be properly larger than that in the compression process, soft rebound is realized as far as possible, namely asymmetric output of the damping force is realized, and the comfort and the safety of a vehicle are improved.

For asymmetric output of damping force, the currently common method is to change the liquid flow path during compression and recovery by a complex valve system, so as to realize asymmetric force output; or by adding an additional flow channel of damping fluid near the designed load position, the asymmetric force output is achieved. The two methods have the defects of complex structure, high cost and the like, and for the magnetorheological damper, the structure is simple, a complex valve system structure is not provided, and if the valve system structure is increased, the stroke of the damper is sacrificed, so that the complexity of the structure of the damper is increased, and the working performance of the damper is influenced. The additional flow passage is added, so that the volume of the shock absorber is easily overlarge, and the use range of the shock absorber is limited.

Therefore, in order to solve the above problems, there is a need for a biconical asymmetric force magnetorheological damper that realizes an asymmetric damping force by a simple structure.

Disclosure of Invention

In view of this, the invention provides a biconical asymmetric force magnetorheological damper, which realizes asymmetric damping force by changing the structure of a piston, and has simple structure and small volume.

The double-cone asymmetric force magnetorheological damper comprises a damping cylinder and a damping piston, wherein a damping gap is formed between the outer circle of the damping piston and the inner circle of the damping cylinder, and the damping piston is in a circular truncated cone shape with a small upper part and a large lower part so that the damping gap is gradually enlarged from bottom to top.

Further, still include floating piston, floating piston and damping cylinder axial seal sliding fit, form the air chamber between floating piston and the damping cylinder bottom.

Further, the damping cylinder comprises an inner cylinder and an outer cylinder sleeved outside the inner cylinder, a gas storage cavity is arranged between the inner cylinder and the outer cylinder, and the inner cylinder is provided with a gas hole which enables the gas storage cavity to be communicated with the air cavity.

Further, the inner cylinder and the outer cylinder are coaxially arranged, and the radial gap between the inner circle of the inner cylinder and the outer circle of the outer cylinder is gradually enlarged from bottom to top so as to enable the gas storage cavity to form a gradual change structure.

Furthermore, the excircle of the inner cylinder is a circular table top with a small top and a large bottom, and the inner circle of the outer cylinder is a cylindrical surface.

Further, the air hole is formed in the center of the bottom of the inner cylinder.

Further, a magnetic coil is arranged outside the damping piston.

The invention has the beneficial effects that:

in the invention, when the damping piston is compressed downwards, the magnetorheological fluid flows from the lower cavity to the upper cavity through the damping gap, the damping gap is expanded from bottom to top, and the flow rate of the magnetorheological fluid is gradually reduced; when the damping piston is in the recovery process of the ascending process, the magnetorheological fluid flows from the upper chamber to the lower chamber through the damping gap, and the flow velocity of the magnetorheological fluid is accelerated because the damping gap is convergent from top to bottom; according to the direct proportion relation between the damping force and the speed under the condition of a certain damping coefficient, the damper can realize the output of asymmetric force of which the compression damping force is smaller than the tension damping force; the damage to a driver caused by the reaction force generated by overlarge compression force damping is avoided, and the road surface vibration energy can be buffered more; in the restoration process, the buffered vibration energy is dissipated through the restoration force as much as possible; when the vehicle turns, the shock absorbers on the inner side and the outer side of the vehicle are stressed differently, one side is pulled, the other side is pressed, the pulling and pressing damping forces are different, and the turning safety of the vehicle can be improved; in addition, the damper is simple in structure, small in size and low in cost, and combines the variable damping force characteristic of the magnetorheological fluid to achieve a large damping adjustment range.

Drawings

The invention is further described below with reference to the figures and examples.

FIG. 1 is a schematic structural view of the present invention;

Detailed Description

As shown in the figure: the double-cone asymmetric force magnetorheological damper comprises a damping cylinder and a damping piston 1, wherein a damping gap is formed between the outer circle of the damping piston and the inner circle of the damping cylinder, and the damping piston is in a truncated cone shape with a small upper part and a large lower part so that the damping gap is gradually enlarged from bottom to top.

As shown in fig. 1, the damping piston is connected with a piston rod 9, the upper end of the damping cylinder is sealed by an upper end cover, the piston rod is in sealing sliding fit with the upper end cover, the inner cavity of the damping cylinder is a cylindrical cavity, the damping piston and the damping cylinder are coaxially arranged, so that a damping gap is of a conical annular structure, the damping piston divides the inner cavity of the damping cylinder into an upper cavity type and a lower cavity type, and magnetorheological fluid is filled in the inner cylinder of the damping cylinder; when the damping piston is compressed downwards, the magnetorheological fluid flows from the lower cavity to the upper cavity through the damping gap, the damping gap is expanded from bottom to top, and the flow rate of the magnetorheological fluid is gradually reduced; when the damping piston is in the recovery process of the ascending process, the magnetorheological fluid flows from the upper chamber to the lower chamber through the damping gap, and the flow velocity of the magnetorheological fluid is accelerated because the damping gap is convergent from top to bottom; according to the direct proportion relation between the damping force and the speed under the condition of a certain damping coefficient, the damper can realize the output of asymmetric force of which the compression damping force is smaller than the tension damping force; the damage to a driver caused by the reaction force generated by overlarge compression force damping is avoided, and the road surface vibration energy can be buffered more; in the restoration process, the buffered vibration energy is dissipated through the restoration force as much as possible; when the vehicle turns, the shock absorbers on the inner side and the outer side of the vehicle are stressed differently, one side is pulled, the other side is pressed, the pulling and pressing damping forces are different, and the turning safety of the vehicle can be improved; in addition, the damper is simple in structure, small in size and low in cost, and combines the variable damping force characteristic of the magnetorheological fluid to achieve a large damping adjustment range.

In the embodiment, the damping cylinder further comprises a floating piston 2, the floating piston is in axial sealing sliding fit with the damping cylinder, and an air cavity 3 is formed between the floating piston and the bottom of the damping cylinder. As shown in fig. 1, the air chamber is a closed chamber structure, the outer circle of the floating piston is axially provided with an annular sealing groove, a sealing ring is arranged in the annular sealing groove, the sealing of the inner circle of the floating piston and the inner circle of the inner cylinder is realized through the sealing ring, the floating piston and the inner cylinder form a compensation cylinder structure, the floating piston can axially slide in an adaptive manner based on the change of the volume in the process of the compression and recovery stroke of the damping piston, the compensation cylinder can ensure that the damper does not have the sudden change of the damping force value at the compression and recovery turning point, and the stable transition of the compression and recovery motion is realized.

In this embodiment, the damping cylinder includes an inner cylinder 4 and an outer cylinder 5 sleeved outside the inner cylinder, an air storage cavity 6 is provided between the inner cylinder and the outer cylinder, and the inner cylinder is provided with an air hole 7 for communicating the air storage cavity with the air cavity. Sealing structures are arranged above the inner cylinder and the outer cylinder, so that the inner cylinder is provided with a closed hydraulic cavity, and the outer cylinder is provided with a closed gas storage cavity; the bottom of the outer cylinder is connected with a hanging ring 10, the inner cylinder and the outer cylinder can be positioned through a connecting ring so as to position the radial relative positions of the inner cylinder and the outer cylinder, and correspondingly, a cushion block can be arranged between the bottom of the inner cylinder and the outer cylinder so as to position the axial relative positions of the inner cylinder and the outer cylinder; the gas storage cavity and the air cavity are filled with inert gas, the gas can flow between the air cavity and the gas storage cavity, the damping force of the gas can be adjusted through the opening size of the gas hole, and a valve can be arranged at the gas hole to control the opening and closing of the gas hole or adjust the opening degree of the gas hole, so that the adjusting range of the damping force is further enlarged.

In this embodiment, the inner cylinder and the outer cylinder are coaxially arranged, and a radial gap between an inner circle of the inner cylinder and an outer circle of the outer cylinder is gradually increased from bottom to top so as to form a gradual change structure of the gas storage cavity. The gradual change of the gap can be realized by setting the outer circle of the inner cylinder to be a tapered surface with a small upper part and a large lower part, and the gradual change of the gap can also be realized by setting the inner circle of the outer cylinder to be a tapered surface with a large upper part and a small lower part; the air storage cavity is in a long strip shape along the axial direction and also serves as an air flow channel, when the damping piston is compressed downwards, air is compressed and flows from the air cavity to the air storage cavity through the air holes, the air in the air storage cavity moves from bottom to top, the air flow channel is in an expansion shape from bottom to top, and the air flow rate is gradually reduced; in the ascending and resetting process of the damping piston, the gas in the gas storage cavity moves from top to bottom, the gas flow channel is in a convergent type from top to bottom, and the gas speed is gradually increased, so that the gas damping force also realizes asymmetric output, the effect of gain is realized on the asymmetric force output of the damper, the damper can cope with the large pulse excitation working condition, and the damping adjustment range is widened.

In this embodiment, the outer circle of the inner cylinder is a circular table top with a small top and a large bottom, and the inner circle of the outer cylinder is a cylindrical surface. The excircle of the inner cylinder is a conical surface, which is beneficial to processing and manufacturing.

In this embodiment, the air hole 7 is opened at the center of the bottom of the inner cylinder. The gas that flows out through the gas pocket by the air pocket is favorable to even distribution in the gas storage intracavity and along the upward flow of gas storage chamber, and in the same way, the gas that flows in through the gas pocket by the gas storage chamber also does benefit to the gas pocket and collects and concentrate.

In this embodiment, a magnetic coil 8 is arranged outside the damping piston. The magnetorheological fluid can be adjusted by arranging the magnetic coil; the number of turns of the coil is gradually decreased from bottom to top along the damping piston, the lower magnetic field is large, and the upper magnetic field is small, so that the magnetic control force is small in compression and large in stretching.

Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.