Magneto-rheological shock absorber with multiple guiding functions

Abstract

The magneto-rheological shock absorber with the multiple guiding functions comprises a cylinder barrel assembly, a piston rod assembly, a guider assembly and a piston assembly, the guider assembly is arranged in the cylinder barrel assembly, the piston rod assembly comprises a piston rod, one end of the piston rod penetrates through the top end of the cylinder barrel assembly and the guider assembly to be connected with the piston assembly, and the other end of the piston rod penetrates through the cylinder barrel assembly and the guider assembly to be connected with the piston assembly. The guider assembly comprises a guider, a first guiding supporting piece and a second guiding supporting piece, the first guiding supporting piece and the second guiding supporting piece are arranged on the guider, the first guiding supporting piece and the second guiding supporting piece are vertically arranged in a spaced mode, the first guiding supporting piece is located at the upper end of the guider, and the second guiding supporting piece is located at the lower end of the guider. And a certain distance is formed between the two guide supporting pieces, so that double guidance is formed, the guide length is increased, the guidance quality is improved, the friction contact surface is not greatly increased, and the lateral force resistance and smaller friction force of the shock absorber are ensured.

Description

Technical Field

[0001] The invention relates to a magnetorheological damper, in particular to a magnetorheological damper with multiple guiding functions. Background Art

[0002] Because the magnetorheological shock absorber contains tiny iron powder particles in the liquid, its friction is large, and the piston rod is more easily worn, resulting in leakage. When the shock absorber is subjected to lateral force, this phenomenon will become more serious. In the existing magnetorheological shock absorber structure, in order to reduce the friction between the piston rod and the sliding bearing, designers usually use sliding bearings with smaller axial dimensions to match the piston rod, but often ignore the guidance of the sliding bearing. The local friction will increase due to poor guidance, and in the magnetorheological shock absorber, due to the poor lubricity of its liquid, the friction between the piston rod and the sliding bearing will be more serious than that of ordinary shock absorbers, and the risk of leakage in the shock absorber is also greater. Therefore, reducing the friction between the piston rod and the sliding bearing is not simply to reduce the contact area. It is also closely related to the guidance of the sliding bearing and the lubricating oil. Therefore, a magnetorheological shock absorber with multiple guidance functions is urgently needed. Summary of the invention

[0003] The object of the present invention is to provide a magnetorheological damper with multiple guiding functions.

[0004] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a magnetorheological shock absorber with multiple guiding functions, which includes a cylinder assembly, a piston rod assembly, a guide assembly and a piston assembly. The guide assembly is installed in the cylinder assembly, and the piston rod assembly includes a piston rod. One end of the piston rod passes through the top end of the cylinder assembly and the guide assembly to be connected with the piston assembly. The guide assembly includes a guide, a first guide support member and a second guide support member arranged on the guide. The first guide support member and the second guide support member are arranged at an upper and lower interval. The first guide support member is located at the upper end of the guide, and the second guide support member is located at the lower end of the guide.

[0005] In one embodiment, the first guide support member and / or the second guide support member is a sliding bearing or a rolling bearing.

[0006] In one embodiment, the guide is provided with a hollow cavity, the hollow cavity is filled with lubricating oil for lubricating the piston rod, the guide is provided with an oil filling hole for filling oil into the hollow cavity, and the oil filling hole is sealed by a sealing strip and a fastening screw.

[0007] In one embodiment, a first sealing ring is provided between the upper end of the guide and the piston rod, and the first sealing ring is located above the first guide support member. A second sealing ring is provided between the lower end of the guide and the piston rod, and the second sealing ring is located below the second guide support member.

[0008] In one embodiment, a baffle is provided at the lower end of the second sealing ring, and a buffer block is provided at the lower end of the baffle.

[0009] In one embodiment, the magnetorheological shock absorber also includes a floating piston assembly, which is installed in the cylinder assembly and located below the piston assembly. A first cavity is formed between the guide assembly and the floating piston assembly, and the first cavity is filled with magnetorheological fluid. The piston assembly reciprocates in the first cavity. A second cavity is formed between the floating piston assembly and the bottom of the cylinder assembly, and the second cavity is filled with nitrogen.

[0010] In one embodiment, a secondary air cylinder is sleeved on the lower end of the cylinder assembly, a secondary air chamber is formed in the gap between the secondary air cylinder and the cylinder assembly, and a vent hole is provided on the lower end side wall of the cylinder assembly to connect the secondary air chamber with the second cavity.

[0011] In one embodiment, the height of the auxiliary air cylinder is H, the volume of the second cavity is V1, the volume of the auxiliary air chamber is V2, the change in volume of the second cavity is ΔV, and (V1+V2+ΔV) / (V1+V2) is 1.1-1.3.

[0012] In one embodiment, an O-ring is provided between the outer wall of the guide and the inner wall of the cylinder assembly, and the O-ring is located above the retaining ring.

[0013] In one embodiment, the cylinder assembly includes a cylinder body, a dust cover sleeved on the top of the cylinder body, and a cylinder bottom cover arranged on the bottom of the cylinder body, and a lifting ring is connected to the bottom of the cylinder bottom cover, and a bushing is nested in the lifting ring.

[0014] After adopting the above technical solution, the present invention has the following advantages:

[0015] 1. In the present invention, a first guide support member and a second guide support member are arranged on the guide, and the first guide support member and the second guide support member are arranged at intervals in the upper and lower directions along the axial direction of the guide, that is, the first guide support member is located at the upper end of the guide, and the second guide support member is located at the lower end of the guide. In this way, the guide is lengthened, and there is a certain distance between the two guide supports, thereby forming a double guide. In this way, the guide length is lengthened and the guide performance is improved, and the friction contact surface is not greatly increased, thereby ensuring the shock absorber's ability to resist lateral forces and a relatively small friction force.

[0016] 2. By setting the first guide support member and / or the second guide support member as a sliding bearing or a rolling bearing, not only can a better guide support be formed for the piston rod assembly, but also when the guide rod reciprocates along the axial direction of the guide, the friction force is smaller, making the reciprocating motion of the piston rod smoother.

[0017] 3. By providing the guide with a hollow cavity and filling the hollow cavity with lubricating oil, when the piston rod moves, there is always lubricating oil between the piston rod and the guide support, which can greatly reduce friction and improve the wear resistance of the piston rod surface. By providing an oil filling hole on the guide, the lubricating oil can be replenished to increase the working time of the piston rod. The oil filling hole is sealed by a sealing strip and a fastening screw to ensure that the lubricating oil does not leak from the oil filling hole.

[0018] 4. By arranging a first sealing ring above the first guide support member and a second sealing ring below the second guide support member, the magnetorheological fluid is effectively prevented from entering the hollow cavity of the guide.

[0019] 5. By setting a baffle at the lower end of the second sealing ring, the magnetorheological fluid can be better and effectively prevented from entering the hollow cavity of the guide, and a buffer block is set at the lower end of the baffle. When the piston rod moves, the magnetorheological fluid is driven to move, and the buffer block can effectively block the impact force of the magnetorheological fluid, thereby better preventing the magnetorheological fluid from entering the hollow cavity of the guide.

[0020] 6. A floating piston assembly is arranged inside the cylinder assembly and below the piston assembly to reduce wear and improve efficiency. A magnetorheological fluid is filled into a first cavity formed between the guide assembly and the floating piston assembly so that when the piston assembly moves in the first cavity, a magnetic induction change is generated between the magnetorheological fluid and the piston assembly, thereby changing the damping force during compression and recovery to achieve a vibration reduction effect. Nitrogen is also filled into a second cavity formed between the floating piston assembly and the bottom of the cylinder assembly to enhance the vibration reduction effect of the shock absorber.

[0021] 7. By sleeved an auxiliary air cylinder at the lower end of the cylinder assembly, an auxiliary air chamber is formed in the gap between the auxiliary air cylinder and the cylinder assembly, and a vent hole connecting the auxiliary air chamber with the second cavity is provided on the side wall of the lower end of the cylinder assembly. In this way, when the air chamber space inside the shock absorber is insufficient, the disturbance of the shock absorber performance caused by the change of the pressure in the air chamber can be reduced, that is, the vibration reduction performance of the shock absorber is further improved, and at the same time, the external volume of the shock absorber is reduced as much as possible.

[0022] 8. By setting the height of the auxiliary air cylinder to H, the volume of the second cavity to V1, the volume of the auxiliary air chamber to V2, the change volume of the second cavity to ΔV, and (V1+V2+ΔV) / (V1+V2) to 1.1~1.3, the pressure change in the air chamber is small when the shock absorber rebounds and compresses, thereby solving the problem of insufficient air chamber space and reducing the external volume of the shock absorber as much as possible.

[0023] 9. An O-ring is provided between the outer wall of the guide and the inner wall of the cylinder assembly, and the O-ring is located above the retaining ring to prevent the magnetorheological fluid from entering the interior of the guide.

[0024] 10. The cylinder assembly includes a cylinder body, a dust cover mounted on the top of the cylinder body and a cylinder bottom cover arranged at the bottom of the cylinder body, a lifting ring is connected to the bottom of the cylinder bottom cover, and a bushing is nested in the lifting ring. In this way, the overall structure of the shock absorber can be simplified and production and assembly are convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be further described below in conjunction with the accompanying drawings:

[0026] Figure 1 It is a schematic diagram of the structure of the magnetorheological damper of the present invention.

[0027] Figure 2 for Figure 1 A is an enlarged view of the middle image.

[0028] Figure 3 for Figure 1 Enlarged view of B.

[0029] The names of the components in the figure are as follows:

[0030] 100, piston rod assembly; 101, piston rod; 150, dust cover; 200, guide assembly; 201, guide; 2010, hollow cavity; 2011, oil filling hole; 205, first sealing ring; 210, O-ring; 215, fastening screw; 220, retaining ring; 225, sealing strip; 230, first guide support; 231, second guide support; 23 5. Second sealing ring; 240. Baffle; 245. Buffer block; 250. Cylinder assembly; 2501. Cylinder body; 2502. Cylinder bottom cover; 2503. Vent; 300. Piston assembly; 350. Steel ring; 400. Auxiliary air cylinder; 410. Auxiliary air chamber; 450. Floating piston assembly; 550. Lifting ring; 600. Bushing; 700. First cavity; 800. Second cavity. DETAILED DESCRIPTION

[0031] In order to more clearly illustrate the overall concept of the present invention, a detailed description is given below in an exemplary manner in conjunction with the accompanying drawings.

[0032] It should be noted that many specific details are set forth in the following description to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0033] In addition, in the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0034] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. However, if it is indicated as a direct connection, it means that the two connected bodies are not connected through an intermediate structure, but are only connected to form a whole through a connecting structure. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0035] In the present invention, unless otherwise clearly specified and limited, the first feature "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples.

[0036] like Figures 1 to 3As shown, the present invention provides a magnetorheological shock absorber with multiple guiding functions, which includes a cylinder assembly 250, a piston rod assembly 100, a guide assembly 200 and a piston assembly 300. The guide assembly 200 is installed in the cylinder assembly 250 and fixed by a retaining ring 220. The piston rod 100 assembly includes a piston rod 101. One end of the piston rod 101 passes through the top end of the cylinder assembly 250 and the guide assembly 200 to be connected with the piston assembly 300. The cylinder assembly 250 includes a cylinder body 2501, a dust cover 150 sleeved on the top end of the cylinder body 2501 and a cylinder bottom cover 2502 arranged at the bottom end of the cylinder body 2501. The bottom of the cylinder bottom cover 2502 is connected to a lifting ring 550, and a bushing 600 is nested in the lifting ring 550. In this way, the overall structure of the shock absorber is simple and convenient for production and assembly.

[0037] In this embodiment, the guide assembly 200 includes a guide 201, a first guide support 230 and a second guide support 231 arranged on the guide 201. The guide 201 is made of aluminum alloy, which can not only reduce weight but also dissipate heat better. In addition, the first guide support 230 and the second guide support 231 are arranged at intervals in the upper and lower parts. The first guide support 230 is located at the upper end of the guide 201, and the second guide support 231 is located at the lower end of the guide 201. In this way, the guide is lengthened, and there is a certain distance between the two guide supports, thereby forming a double guide. This not only lengthens the guide length and improves the guiding performance, but also does not significantly increase the friction contact surface, thereby ensuring the shock absorber's ability to resist lateral force and relatively small friction.

[0038] In some embodiments, the first guide support member 230 and the second guide support member 231 are both sliding bearings, which can not only provide better guide support for the piston rod assembly, but also reduce the friction when the guide rod reciprocates along the axial direction of the guide, making the reciprocating motion of the piston rod smoother; of course, they can also be both rolling bearings, or one can be a sliding bearing and the other can be a rolling bearing, but this is not limited to this.

[0039] In some embodiments, the guide 201 is hollow to form a hollow cavity 2010, and the hollow cavity 2010 is filled with lubricating oil for lubricating the piston rod 101. In this way, when the piston rod moves, there is always lubricating oil between the piston rod and the guide support, which can greatly reduce friction and improve the wear resistance of the piston rod surface. At the same time, an oil filling hole 2011 for filling oil into the hollow cavity 2010 is provided on the guide 201. The oil filling hole 2011 is sealed by a sealing strip 225 and a fastening screw 215. In this way, the lubricating oil can be replenished to increase the working time of the piston rod. The oil filling hole is also sealed by a sealing strip and a fastening screw to ensure that the lubricating oil does not leak from the oil filling hole.

[0040] In some embodiments, a first sealing ring 205 may be provided between the upper end of the guide 201 and the piston rod 101, and the first sealing ring 205 is located above the first guide support 230; a second sealing ring 235 is provided between the lower end of the guide 201 and the piston rod 101, and the second sealing ring 235 is located below the second guide support 231, so as to effectively prevent the magnetorheological fluid from entering the hollow cavity of the guide; and, a baffle 240 may be provided at the lower end of the second sealing ring 235, and a buffer block 245 is provided at the lower end of the baffle 240, so that when the piston rod moves, the magnetorheological fluid is driven to move, and the buffer block can effectively block the impact force of the buffered magnetorheological fluid, thereby better preventing the magnetorheological fluid from entering the hollow cavity of the guide.

[0041] In some embodiments, an O-ring 210 is provided between the outer wall of the guide 201 and the inner wall of the cylinder body 2501 , and the O-ring 210 is located above the retaining ring 220 to prevent the magnetorheological fluid from entering the interior of the guide.

[0042] In some embodiments, the magnetorheological shock absorber also includes a floating piston assembly 450, which is installed in the cylinder assembly 250 and located below the piston assembly 300, so as to better reduce wear and improve efficiency. A first cavity 700 is formed between the guide assembly 200 and the floating piston assembly 450, and the first cavity 700 is filled with magnetorheological fluid. The piston assembly 300 reciprocates in the first cavity 700, so that when the piston assembly moves in the first cavity, a magnetic induction change is generated between the magnetorheological fluid, thereby changing the damping force during compression and recovery to achieve a shock absorbing effect. A second cavity 800 is formed between the floating piston assembly 450 and the bottom of the cylinder assembly 250, and the second cavity 800 is filled with nitrogen to enhance the shock absorbing effect of the shock absorber.

[0043] In some embodiments, a secondary air cylinder 400 is sleeved on the lower end of the cylinder assembly 250, and a secondary air chamber 410 is formed in the gap between the secondary air cylinder 400 and the cylinder assembly 250. A vent hole 2503 is provided on the lower end side wall of the cylinder assembly 250, which connects the secondary air chamber 410 with the second cavity 800. In this way, when the air chamber space inside the shock absorber is insufficient, the disturbance of the shock absorber performance caused by the change of pressure in the air chamber can be reduced, which further improves the shock absorption performance of the shock absorber, while reducing the external volume of the shock absorber as much as possible.

[0044] In some embodiments, the height of the auxiliary air cylinder 400 is H, the volume of the second cavity 800 is V1, the volume of the auxiliary air chamber 410 is V2, the change volume of the second cavity 800 is ΔV, (V1+V2+ΔV) / (V1+V2) is 1.1~1.3, preferably 1.2, so that when the shock absorber rebounds and compresses, the pressure in the air chamber changes little, thereby solving the problem of insufficient air chamber space and reducing the external volume of the shock absorber as much as possible.

[0045] In addition to the above preferred embodiments, the technical solutions protected by the present invention are not limited to the above embodiments. It should be pointed out that the combination of the technical solutions of any embodiment with the technical solutions of one or more other embodiments is within the protection scope of the present invention. Although the present invention has been described in detail above with general descriptions and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made to it based on the present invention. Therefore, these modifications or improvements made without departing from the spirit of the present invention all belong to the scope of protection claimed by the present invention.

Claims

1. A magnetorheological damper with multiple guiding functions, characterized in that: It includes a cylinder assembly, a piston rod assembly, a guide assembly and a piston assembly. The guide assembly is installed in the cylinder assembly. The piston rod assembly includes a piston rod. One end of the piston rod passes through the top end of the cylinder assembly and the guide assembly to be connected with the piston assembly. The guide assembly includes a guide, a first guide support member and a second guide support member arranged on the guide. The first guide support member and the second guide support member are arranged at an upper and lower interval. The first guide support member is located at the upper end of the guide, and the second guide support member is located at the lower end of the guide.

2. The magnetorheological damper according to claim 1, characterized in that: The first guide support member and / or the second guide support member is a sliding bearing or a rolling bearing.

3. The magnetorheological damper according to claim 1, characterized in that: The guide is provided with a hollow cavity, the hollow cavity is filled with lubricating oil for lubricating the piston rod, and the guide is provided with an oil filling hole for filling oil into the hollow cavity, and the oil filling hole is sealed by a sealing strip and a fastening screw.

4. The magnetorheological damper according to claim 3, characterized in that: A first sealing ring is provided between the upper end of the guide and the piston rod, and the first sealing ring is located above the first guide support member. A second sealing ring is provided between the lower end of the guide and the piston rod, and the second sealing ring is located below the second guide support member.

5. The magnetorheological damper according to claim 4, characterized in that: A baffle is provided at the lower end of the second sealing ring, and a buffer block is provided at the lower end of the baffle.

6. The magnetorheological damper according to claim 1, characterized in that: The magnetorheological damper also includes a floating piston assembly, which is installed in the cylinder assembly and located below the piston assembly. A first cavity is formed between the guide assembly and the floating piston assembly, and the first cavity is filled with magnetorheological liquid. The piston assembly reciprocates in the first cavity. A second cavity is formed between the floating piston assembly and the bottom of the cylinder assembly, and the second cavity is filled with nitrogen.

7. The magnetorheological damper according to claim 6, characterized in that: The lower end of the cylinder assembly is sleeved with an auxiliary air cylinder, the gap between the auxiliary air cylinder and the cylinder assembly forms an auxiliary air chamber, and the lower end side wall of the cylinder assembly is provided with a vent hole connecting the auxiliary air chamber with the second cavity.

8. The magnetorheological damper according to claim 7, characterized in that: The height of the auxiliary air cylinder is H, the volume of the second cavity is V1, the volume of the auxiliary air chamber is V2, the change volume of the second cavity is ΔV, and (V1+V2+ΔV) / (V1+V2) is 1.1-1.

3.

9. The magnetorheological damper according to claim 1, characterized in that: An O-type sealing ring is arranged between the outer side wall of the guide and the inner side wall of the cylinder assembly, and the O-type sealing ring is located above the retaining ring.

10. The magnetorheological damper according to claim 1, characterized in that: The cylinder assembly comprises a cylinder body, a dust cover sleeved on the top of the cylinder body and a cylinder bottom cover arranged on the bottom of the cylinder body. A lifting ring is connected to the bottom of the cylinder bottom cover, and a bushing is nested in the lifting ring.

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