Magnetorheological guider

Abstract

An outer oil seal assembly, a lining assembly and an inner oil seal assembly are sequentially arranged on an outer shell of the guider from top to bottom, an outer oil seal sealing cavity is formed between the lining assembly and the outer oil seal assembly, an outer oil seal ring is arranged in the outer oil seal sealing cavity, and the lining assembly comprises a lining installation cavity and a lubricating liquid cavity. A lining installation base is arranged in the lining installation cavity, the outer oil seal sealing cavity and the lubricating liquid cavity are filled with lubricating oil, a lining is arranged in the lining installation base, a flowing channel is formed in the circumferential direction of the lining installation base, and the lubricating oil flows between the outer oil seal sealing cavity and the lubricating liquid cavity through the flowing channel. Part of gas enters the guider through a guider oil seal at the lower end and cannot be discharged, friction force and abrasion are increased due to increase of internal pressure of the guider, and the problem that oil leakage occurs due to failure of the oil seal due to long-time abrasion and erosion of magnetorheological fluid solid particles is solved.

Description

Technical Field

[0001] This invention relates to the field of magnetorheological damper technology, specifically to magnetorheological guides. Background Technology

[0002] In the operation of magnetorheological dampers, the oil seal is one of the core components. Most magnetorheological dampers currently use double-layer oil seals, with a certain amount of silicone grease added between the two seals to ensure lubrication during operation. Alternatively, traditional lubricating oil can be added between the two seals to further address lubrication issues.

[0003] However, traditional lubricating oils and silicone greases have poor low-temperature fluidity and are prone to losing fluidity under extreme working conditions. In this case, magnetorheological solid particles will not only damage the oil seal, but also fail to meet the lower low-temperature damping force requirements of magnetorheological vibration dampers. Moreover, the lubricating performance of conventional lubricating oils is not durable enough to continuously solve the friction problem between the oil seal and piston rod of the magnetorheological vibration damper. At the same time, the vibration damper has the problem of not being able to balance low friction and high durability. The guide bushing mounting seat isolates the space inside the upper and lower oil seals. During the operation of the vibration damper, some gas enters the interior of the guide through the lower guide oil seal and cannot be discharged, which increases the internal pressure of the guide and thus increases the friction.

[0004] Traditional guides seal the various cavities to maintain a tight seal. However, with prolonged use, gas accumulates inside. The area between the bushing and piston rod has the largest contact area, resulting in the greatest frictional heating. This heating causes internal air bubbles to increase internal pressure, increasing friction and causing significant expansion at this contact point. In contrast, the adjacent cavities are oil-sealed, resulting in less expansion due to frictional heating and a smaller change in gas pressure. This creates a pressure difference, leading to inconsistent friction between the upper and lower ends of the guide bushing. Consequently, the high-pressure end experiences increased wear, reducing its service life.

[0005] Chinese patent document CN202011374431.6 discloses an energy-saving guide assembly for a vibration damper, including a vibration damper cylinder, a guide, and a piston rod. The guide is disposed inside the vibration damper cylinder, and the piston rod is movably connected between the middle of the vibration damper cylinder and the guide. A first buffer spring is fixedly connected to the inner bottom wall of the vibration damper cylinder, and a movable plate is fixedly connected to the upper surface of the first buffer spring. A locking block is fixedly connected to the inner wall of the vibration damper cylinder. The invention, through the arrangement of the first buffer spring and the support plate, can resist part of the pressure and play a buffering role, while protecting the first buffer spring. Through the cooperation of the first sealing gasket, the second sealing gasket, and the third sealing gasket, a certain damping effect is achieved, buffering part of the kinetic energy, and completely sealing the vibration damper cylinder to prevent high-pressure oil leakage.

[0006] However, since the aforementioned magnetorheological damper contains magnetorheological fluid with solid particles, the oil seal during the operation of the magnetorheological damper will fail and leak oil due to long-term wear and erosion by the solid particles. Therefore, a magnetorheological guide with lubricating oil is designed to improve the sealing effect by improving the composition of the lubricating oil, reduce the risk of oil and air leakage, and resist the wear and erosion of the oil seal by solid particles in the magnetorheological fluid. At the same time, a new internal structure of the guide is designed to improve the flow of internal lubricating fluid and balance internal pressure. Summary of the Invention

[0007] The purpose of this invention is to provide a magnetorheological guide, which aims to improve the existing shock absorber. During continuous operation, some gas enters the guide through the lower guide oil seal and cannot be discharged, resulting in increased internal pressure in the guide, which in turn increases friction and wear. Furthermore, the long-term wear and erosion of solid particles in the magnetorheological fluid leads to oil seal failure and oil leakage.

[0008] The present invention is implemented as follows: a magnetorheological guide includes a guide housing, which is provided with an outer oil seal assembly, a bushing assembly and an inner oil seal assembly from top to bottom. An outer oil seal sealing cavity is formed between the bushing assembly and the outer oil seal assembly. An outer oil seal ring is disposed in the outer oil seal sealing cavity. The bushing assembly includes a bushing mounting cavity and a lubricating fluid cavity. A bushing mounting seat is disposed in the bushing mounting cavity. The outer oil seal sealing cavity and the lubricating fluid cavity are filled with lubricating oil. A bushing is disposed in the bushing mounting seat. A flow channel is provided in the circumferential direction of the bushing mounting seat. The lubricating oil flows between the outer oil seal sealing cavity and the lubricating fluid cavity through the flow channel. The lubricating oil is composed of the following components by weight: 65-85% complex base oil; 10-25% complex ester; 1-5% stabilizer; 0.3-2% micro / nano PTFE dispersion; 0.05-1.5% multi-effect dispersant; 0.5-5% complex friction modifier; 0.01-0.2% metal passivator; 0.05-0.5% antioxidant; and 0.01-0.05% antifoaming agent.

[0009] In one embodiment of the present invention, the bushing mounting base has an annular structure, the bushing mounting base includes an outer wall and an inner wall, the bushing is snapped onto the inner wall of the bushing mounting base, and the flow channel is disposed on the outer wall.

[0010] As one embodiment of the present invention, the flow channel includes a middle transverse channel and a plurality of lower connecting channels and upper connecting channels connected to the middle transverse channel. The middle transverse channel is located in the middle of the outer wall and is arranged around the outer wall and connected end to end.

[0011] In one embodiment of the present invention, the number of lower connecting channels and upper connecting channels are equal and there are two or more of each. Each of the lower connecting channels or upper connecting channels is evenly arranged in the circumferential direction of the outer wall, and each of the lower connecting channels and upper connecting channels is spaced apart.

[0012] In one embodiment of the present invention, the inner wall of the bushing mounting cavity is provided with a plurality of upper conical grooves and lower conical grooves spaced apart vertically. The height of the upper conical grooves and the lower conical grooves are the same as the height of the upper connecting channel and the lower connecting channel, and the number of them corresponds one-to-one.

[0013] The beneficial effects of this invention are: 1. The bushing mounting base of the present invention is provided with a flow channel and an upper conical groove and a lower conical groove, which expands the internal space of the guide and increases the fluidity of the internal space. During the operation of the shock absorber, the lubricating oil can flow and lubricate fully, and the internal air pressure can be kept consistent quickly. This maintains the pressure on the upper and lower contact surfaces of the shock absorber piston rod the same, maintains stable friction, thereby reducing the loss caused by friction imbalance and increasing the service life of the guide. 2. The flow channel and upper and lower conical grooves on the bushing mounting base of the present invention are displaced and arranged to change the stress distribution, so that the stress is more evenly distributed in all parts of the component, thereby reducing the phenomenon of local stress concentration, absorbing and releasing the internal stress of the guide bushing mounting base, and improving the fatigue life of the guide. 3. The lubricating oil provided in this invention provides basic lubrication between the piston rod and the inner and outer oil seal components in the double oil seal guide. At the same time, through the deposition and adhesion of nanomaterials on the oil seal surface, it ensures that the oil seal and piston rod still have a low coefficient of friction after long-term operation. This solves the problem of insufficient lubrication between the piston rod and oil seal after long-term operation of the magnetorheological fluid double oil seal guide, which leads to increased friction of the magnetorheological fluid shock absorber. 4. Excellent lubrication, strong oil seal compatibility, and good low-temperature fluidity ensure that the shock absorber has less friction at low temperatures. Non-ionic alkanolamines and alkanolamides are introduced as multi-effect dispersants. The lubricating oil has strong compatibility with the magnetorheological fluid system. Even if a sealing leakage problem occurs, this lubricating oil composition will not affect the performance of the magnetorheological fluid. Attached Figure Description

[0014] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention, making other features, objects, and characteristics of the invention more apparent. The illustrative embodiments of the invention, along with their descriptions, are used to explain the invention and do not constitute an undue limitation of the invention.

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2This is an internal sectional view of the present invention; Figure 3 This is a cross-sectional schematic diagram of the guide housing of the present invention; Figure 4 This is a schematic cross-sectional view of the overall structure of the present invention; Figure 5 This is a schematic diagram of the bushing mounting base of the present invention; In the figure: 1. Guide housing; 2. Inner oil seal assembly; 3. Outer oil seal assembly; 30. Outer oil seal sealing cavity; 4. Bushing assembly; 40. Bushing mounting cavity; 40. Upper conical groove; 401. Lower conical groove; 402. Lubricating fluid cavity; 41. Bushing mounting seat; 5. Bushing; 6. Flow channel; 50. Intermediate transverse channel; 501. Lower connecting channel; 502. Upper connecting channel; 7. Lubricating oil. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0017] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0018] Example 1: As Figure 1-5 As shown, the present invention provides a magnetorheological guide to solve the problem that during the operation of a magnetorheological damper, frictional heating causes internal air pressure to expand due to heat, resulting in inconsistent air pressure at the upper and lower ends. At the same time, prolonged high-speed operation generates air bubbles, which increases the pressure inside the guide, increases the friction between the bushing and the piston rod, increases wear, increases the overall wear of the guide, reduces its service life, and easily causes instability of the damper.

[0019] The main solution involves establishing an internal circulation channel, which not only ensures the free flow of lubricating oil for sufficient lubrication but also maintains consistent air pressure at both ends of the bushing, thus ensuring consistent friction. It also increases the internal space to prevent friction-induced heating or bubble formation, which could lead to increased friction and wear. Furthermore, by improving the lubricating oil composition, a lubricating film is created to ensure basic lubrication between the piston rod and oil seal in the double oil seal guide. Simultaneously, the deposition and adhesion of nanomaterials on the oil seal surface ensures that the oil seal maintains a low coefficient of friction with the piston rod even after long-term operation. This solves the problem of insufficient lubrication between the piston rod and oil seal in magnetorheological fluid double oil seal guides after prolonged operation, which previously led to increased friction in the magnetorheological fluid damper.

[0020] like Figure 1-2 As shown, the guide of this magnetorheological damper mainly includes a guide housing 1, which is provided with a connecting hole 10 for placing a piston rod 11; the guide housing 1 is provided with a dustproof sealing assembly 2, an outer oil seal assembly 3, a bushing assembly 4 and an inner oil seal assembly 2.

[0021] like Figure 2 As shown, the guide of the magnetorheological damper includes a guide housing 1 with a connecting hole 10 in the middle for accommodating the piston rod 11. The outer oil seal assembly 3 prevents lubricating oil from flowing out, and the inner oil seal assembly 2 prevents the internal magnetorheological fluid from flowing out and prevents lubricating oil from mixing into the magnetorheological fluid.

[0022] The outer oil seal assembly 3 includes an outer oil seal cavity 30 and an outer oil seal ring 31. The bushing assembly 4 includes a bushing mounting cavity 40 and a lubricating fluid cavity 41 that are interconnected. A bushing mounting seat 5 is provided in the bushing mounting cavity 40. Both the outer oil seal cavity 30 and the lubricating fluid cavity 41 are filled with the special lubricating oil 7 prepared in this invention. A bushing 6 is provided in the bushing mounting seat 5. The bushing 6 is slidably fitted with the piston rod 11. A flow channel 50 is provided on the side wall of the bushing mounting seat 5. The flow channel 50 balances the pressure at both ends of the bushing 6, ensuring consistent friction at both ends of the bushing 6. Moreover, the lubricating oil can flow freely and evenly, reducing wear. The lubricating oil 7 flows between the outer oil seal cavity 30 and the lubricating fluid cavity 41 through the flow channel 50. When the guide is working, it provides continuous and effective lubrication for the moving parts, reducing friction and wear, and extending the service life of the guide.

[0023] Specifically, such as Figures 2-5 As shown, the bushing mounting base 5 has an annular structure, the bushing 6 is snapped into the inner wall of the bushing mounting base 5, the lower surface of the outer oil seal assembly 3 and the upper surface of the bushing mounting base 5 form the outer oil seal cavity 30, the flow channel 50 is arranged on the outer periphery of the bushing mounting base 5, and the flow channel 50 connects the outer oil seal cavity 30 and the lubricating fluid cavity 41.

[0024] like Figure 5 As shown, the flow channel 50 includes a central transverse channel 501 and several lower connecting channels 502 and upper connecting channels 503 connected to the central transverse channel 501. The central transverse channel 501 is located in the middle of the outer wall 51 and is arranged around the outer wall 51 with its ends connected. The central transverse channel 501 is configured in the shape of an annular groove to connect the lower connecting channels 502 and upper connecting channels 503. The lengths of both the lower connecting channels 502 and upper connecting channels 503 are greater than half the length of the outer wall 51.

[0025] To ensure smooth gas flow, the number of lower connecting channels 502 and upper connecting channels 503 is equal and there are more than two of each. Each lower connecting channel 502 or upper connecting channel 503 is evenly arranged in the circumferential direction of the outer wall 51, and each lower connecting channel 502 and upper connecting channel 503 is spaced apart.

[0026] In this embodiment, there are three lower connection channels 502 and three upper connection channels 503. The lower connection channels 502 are spaced 120 degrees apart, and the lower connection channels 502 and the upper connection channels 503 are spaced 50 degrees apart.

[0027] According to the ideal gas law in thermodynamics, based on PV=nRT, at the same temperature T, increasing V and decreasing P reduces the internal pressure of the guide, thereby reducing friction. Therefore, the depths of each lower connecting channel 502 and upper connecting channel 503 are greater than the depth of the middle transverse channel 501. By increasing the depth, the overall volume of the bushing mounting cavity 40 connected to the lower connecting channel 502 and the volume of the outer oil seal sealing cavity 30 connected to the upper connecting channel 503 are increased, which is used to disperse the pressure effect caused by the temperature rise.

[0028] The lower connecting channel 502 and the upper connecting channel 503 are located on the upper and lower sides of the middle transverse channel 501, respectively. There are more than two of each channel, and they are evenly distributed circumferentially. Their depth is greater than that of the middle transverse channel 501. The lower connecting channels 502 and the upper connecting channels 503 are arranged alternately to ensure uniform diffusion of the lubricant.

[0029] like Figures 3-5As shown, to further increase the internal space and facilitate gas flow, the inner wall of the bushing mounting cavity 40 is provided with several upper conical grooves 401 and lower conical grooves 402 spaced vertically. The lengths of the upper conical grooves 401 and lower conical grooves 402 are the same as the lengths of the upper connecting channel 503 and the lower connecting channel 502, respectively, and their numbers correspond one-to-one. The upper conical grooves 401 and lower conical grooves 402 are respectively embedded in the inner wall of the bushing mounting cavity 40, further increasing the internal space of the outer oil seal sealing cavity 30 and the bushing mounting cavity 40. The upper conical grooves 401 and lower conical grooves 402 not only guide the flow direction of the lubricating oil 7 and enhance the lubrication effect, but also facilitate air flow, ensuring consistent air pressure throughout.

[0030] First, install the outer oil seal assembly 3 at the designated position on the upper part of the guide housing 1. Then, place the bushing mounting seat 5 into the preset bushing mounting cavity 40 position inside the guide housing 1. The bushing mounting seat 5 has a ring structure. The bushing 6 is snapped onto the inner wall of the bushing mounting seat 5 to ensure that the bushing 6 fits tightly with the inner wall 52. Then, fill the outer oil seal sealing cavity 30 and the lubricating fluid cavity 41 with lubricating oil 7. Next, install the inner oil seal assembly 2 at the designated position on the lower part of the guide housing 1. The inner oil seal assembly 2 uses high-performance sealing material and works together with the outer oil seal assembly 3 to ensure the sealing of the guide's interior.

[0031] The lubricating oil 7 of the present invention is composed of the following components in parts by weight: 65-85% composite base oil; 10-25% composite ester; 1-5% stabilizer; 0.3-2% micro / nano PTFE dispersion; 0.05-1.5% multi-effect dispersant; 0.5-5% composite friction modifier; 0.01-0.2% metal passivator; 0.05-0.5% antioxidant; and 0.01-0.05% antifoaming agent.

[0032] The complex base oil is a compound of two or more of decene, dodecene, or polyalphaolefin base oils, and its kinematic viscosity at 100°C is 1.5–10 mm. 2 / s, the complex ester is a complex of two or more of the following: sebacic acid ester, adipate ester, trihydroxypropane oleate, and trihydroxypropane octyl decanoate, wherein the total weight ratio of sebacic acid ester and adipate ester to the total weight ratio of trihydroxypropane oleate and trihydroxypropane octyl decanoate is between 25:1 and 5:1.

[0033] The stabilizer is an oil-soluble polyether with a kinematic viscosity of ≤10 mmHg at 100°C. 2 / s, micro / nano PTFE size is 100nm-1um, and the multi-effect dispersant is a C12-C18 alkanolamine or alkanolamide compound.

[0034] The composite friction modifier is a compound of two or more of the following: molybdenum dialkyl dithiophosphate, molybdenum dialkyl dithiocarbamate, coconut oil molybdate, aminothioester, and borate.

[0035] The metal passivating agent is a benzotriazole derivative or a thiadiazole derivative; the antioxidant is an aniline compound; and the antifoaming agent is dimethyl silicone oil.

[0036] The preparation method of the above-mentioned lubricating oil includes the following steps: Step 1: Prepare micro / nano PTFE dispersion. Weigh the composite base oil and composite ester according to the ratio and add them to the reaction vessel. Heat the reaction vessel to 70-80℃, control the stirring speed to 400-500r / min, and stir for 10 minutes. Then add the stabilizer, multi-effect dispersant, and antifoaming agent, maintain the temperature, and stir for 10-30 minutes. Continue to add micro / nano PTFE, increase the stirring speed to 1500-2000r / min, and stir for 2 hours. Step 2: Process control. Keep the temperature inside the reactor constant at 60-70℃ and the stirring speed at 400-500 r / min. Then add the composite friction modifier, metal passivator, and antioxidant, and stir for 1 hour. Step 3: To produce the finished product, reduce the temperature in the reactor to 50-55℃, control the stirring speed to 400-500 r / min, and continue stirring for 3 hours to obtain a low-friction lubricating oil for magnetorheological guides.

[0037] Example 1: The following raw materials are prepared: Complex base oil: 75.55 parts of Mobil PAO4 and PAO6 synthetic oil in a ratio of 8:1. Complex ester: 12 parts dioctyl sebacate, 2 parts trihydroxypropane octyl-decanoate. Stabilizer: 3.6 parts of OSP32 oil-soluble polyether; Micro / nano PTFE: PTFE with a median particle size of 200 nm, 2.4 parts: Multi-purpose dispersant: 1 part talloyl amide: Composite friction modifier: 0.8 parts of molybdenum dialkyl dithiophosphate, 1.2 parts of T323 aminothioester, and 0.8 parts of coconut oil molybdate. Metal passivating agent: 0.1 parts of T551 benzotriazole derivative. Antioxidant: 0.5 parts of dibutyldiphenylamine Antifoaming agent: 0.05 parts of T901 dimethyl silicone oil.

[0038] Preparation process: Step 1: Prepare micro / nano PTFE dispersion. Weigh the composite base oil and composite ester according to the ratio and add them to the reaction vessel. Heat the reaction vessel to 70°C, control the stirring speed at 500 r / min, and stir for 10 minutes. Then add the stabilizer, multi-effect dispersant, and antifoaming agent, maintain the temperature, and stir for 30 minutes. Continue to add micro / nano PTFE, increase the stirring speed to 1500 r / min, and stir for 2 hours. Step 2: Process control. Keep the reactor temperature constant at 65℃ and the stirring speed at 400 r / min. Then add the composite friction modifier, metal passivator, and antioxidant, and stir for 1 hour. Step 3: To produce the finished product, the temperature inside the reactor is lowered to 55°C, the stirring speed is controlled at 400 r / min, and stirring is continued for 3 hours to obtain the final product of Example 1, which is used as a low-friction lubricating oil for magnetorheological dampers.

[0039] Example 2: The following raw materials are prepared: Complex base oil: 74.75 parts of Mobil PAO2, PAO4 and PAO8 synthetic oil, with a weight ratio of 2:8:3 for each component; Complex ester: 14 parts diisooctyl sebacate, 3 parts trihydroxypropane oleate; Stabilizer: 2 parts OSP46 oil-soluble polyether; Micro / nano PTFE: 2 parts of PTFE with a median particle size of 200 nm; Multi-purpose dispersant: 1 part talloyl amide; Composite friction modifier: 1.2 parts of molybdenum dialkyl dithiocarbamate, 1.5 parts of boron ester, and 1.2 parts of coconut oil molybdate; Metal passivating agent: 0.1 parts of thiadiazole tert-dodecyl mercaptan condensate; Antioxidant: 0.2 parts of phenyl-α-naphthylamine; Antifoaming agent: 0.05 parts of T901 dimethyl silicone oil; Preparation process: Step 1: Prepare micro-nano PTFE dispersion. Weigh out composite base oil and composite ester according to the ratio, heat to 75℃, control the speed at 500r / min, stir for 10 minutes, then add stabilizer, multi-effect dispersant and antifoaming agent, maintain the temperature and stir for 30 minutes, continue to add micro-nano PTFE, increase the speed to 1500r / min and stir for 2 hours. Step 2: Process control. Keep the reactor temperature constant at 60℃ and the stirring speed at 500 r / min. Then add the composite friction modifier, metal passivator, and antioxidant, and stir for 1 hour. Step 3: To produce the finished product, the temperature inside the reactor is lowered to 50°C, the stirring speed is controlled at 400 r / min, and stirring is continued for 3 hours to obtain the final product of Example 2, which is a low-friction lubricating oil for magnetorheological dampers.

[0040] The experiment used common silicone grease, the lubricant prepared in Example 1, and the lubricant prepared in Example 2 to conduct friction durability tests. The three groups of lubricants were added to the same type of shock absorber for preliminary friction measurement, followed by a 50,000-cycle vibration durability test, and the friction was measured again. The experimental results are shown in Table 1 below.

[0041]

[0042] The table above shows that the frictional force of the lubricating oil produced by this invention is 42%-44% of that of conventional silicone grease lubricating oils, demonstrating a significant lubrication effect. Furthermore, after 50,000 vibration durability tests, the frictional force of all lubricating oils increased; the frictional force of conventional silicone grease lubricating oil increased by 34.7%, the frictional force of the lubricating oil in Example 1 increased by 30.9%, and the frictional force of the lubricating oil in Example 2 increased by 22.5%. Overall, the low-friction lubricating oil prepared by this invention has low overall friction and high wear resistance over long-term use. The formulation ratio in Example 2 is preferred. The lubricating oil film used in this invention ensures basic lubrication between the piston rod and the oil seal in the double oil seal guide. At the same time, through the deposition and adhesion of nanomaterials on the surface of the oil seal, it ensures that the oil seal and the piston rod still have a low coefficient of friction after long-term operation. This solves the problem of insufficient lubrication between the piston rod and the oil seal in the magnetorheological fluid double oil seal guide after long-term operation, which leads to increased friction in the magnetorheological fluid damper.

[0043] This lubricant offers excellent lubrication, exhibits strong compatibility with oil seals, and demonstrates good low-temperature fluidity, ensuring lower friction in shock absorbers at low temperatures. Based on application requirements, non-ionic alkanolamines and alkanolamides are innovatively introduced as multi-effect dispersants, exhibiting strong compatibility with magnetorheological fluid systems. Even in the event of sealing problems, this lubricant composition does not affect the performance of the magnetorheological fluid. Furthermore, the technical solutions of the various embodiments of this invention can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or impossible to implement, such a combination should be considered non-existent and not within the scope of protection claimed by this invention.

[0044] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A magnetorheological guide, characterized in that, The device includes a guide housing (1), which is provided with an outer oil seal assembly (3), a bushing assembly (4) and an inner oil seal assembly (2) from top to bottom. An outer oil seal sealing cavity (30) is formed between the bushing assembly (4) and the outer oil seal assembly (3). An outer oil seal ring (31) is provided in the outer oil seal sealing cavity (30). The bushing assembly (4) includes a bushing mounting cavity (40) and a lubricating fluid cavity (41). A bushing mounting seat (5) is provided in the bushing mounting cavity (40). The outer oil seal sealing cavity (30) and the lubricating fluid cavity (41) are filled with lubricating oil (7). A bushing (6) is provided in the bushing mounting seat (5). A flow channel (50) is provided in the circumferential direction of the bushing mounting seat (5). The lubricating oil (7) flows between the outer oil seal sealing cavity (30) and the lubricating fluid cavity (41) through the flow channel (50). The lubricating oil (7) is composed of the following components in parts by weight: 65-85% composite base oil; 10-25% composite ester; 1-5% stabilizer; 0.3-2% micro / nano PTFE dispersion; 0.05-1.5% multi-effect dispersant; 0.5-5% composite friction modifier; 0.01-0.2% metal passivator; 0.05-0.5% antioxidant; and 0.01-0.05% antifoaming agent.

2. The magnetorheological guide according to claim 1, characterized in that, The bushing mounting base (5) is an annular structure. The bushing mounting base (5) includes an outer wall (51) and an inner wall (52). The bushing (6) is snapped onto the inner wall (52) of the bushing mounting base (5). The flow channel (50) is disposed on the outer wall (51).

3. The magnetorheological guide according to claim 2, characterized in that, The flow channel (50) includes a middle transverse channel (501) and several lower connecting channels (502) and upper connecting channels (503) connected to the middle transverse channel (501). The middle transverse channel (501) is located in the middle of the outer wall (51) and is arranged around the outer wall (51) and connected end to end.

4. The magnetorheological guide according to claim 3, characterized in that, The number of lower connecting channels (502) and upper connecting channels (503) is equal and there are more than two of each. Each of the lower connecting channels (502) or upper connecting channels (503) is evenly arranged in the circumferential direction of the outer wall (51), and each of the lower connecting channels (502) and upper connecting channels (503) is spaced apart.

5. The magnetorheological guide according to claim 4, characterized in that, The inner wall of the bushing mounting cavity (40) is provided with a plurality of upper conical grooves (401) and lower conical grooves (402) spaced apart vertically. The height of the upper conical grooves (401) and lower conical grooves (402) is the same as the height of the upper connecting channel (503) and lower connecting channel (502), and the number of them corresponds one to one.

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