Liquid flow circulation type magnetorheological brake

Abstract

The invention provides a liquid flow circulation type magneto-rheological brake which comprises a brake shell, a rotating shaft arranged on one side of the brake shell and a brake disc arranged in the brake shell and connected with the rotating shaft, the brake shell comprises a transparent cover and an end cover arranged on one side of the transparent cover, and a transparent disc is arranged on one side of the transparent cover. The end face of the shaft tail arranged on the side, close to the end cover, of the rotating shaft is connected with a braking circular ring disc through a sine transmission mechanism, the sine mechanism transmission working principle is adopted, when the driving piece rotates, the driven piece is driven to do radial linear reciprocating motion, and a shearing-valve working mode is formed. The liquid flow circulation type magneto-rheological brake comprises a shearing working mode and a shearing-valve working mode, output of larger braking torque under the same volume is achieved, meanwhile, magneto-rheological fluid circularly flows in the brake, the performance problem of the magneto-rheological fluid under the influence of the temperature is solved, the service life is prolonged, and the working stability is improved.

Description

Technical Field

[0001] The invention relates to the technical field of brakes, and in particular to a liquid flow circulation type magnetorheological brake. Background Art

[0002] Magnetorheological fluid has been widely studied and applied due to its unique working mode and stable working performance. As an excellent magnetorheological intelligent device, magnetorheological brake has the advantages of rapid braking response, continuously adjustable torque, and low energy consumption. The main working modes of magnetorheological fluid are: flow, shear, and extrusion. So far, in the design and research of magnetorheological brakes, shear and extrusion modes are mainly used.

[0003] With the continuous advancement of science and technology and the continuous improvement of production standards, higher requirements have been placed on the operation stability and performance output of mechanical devices. However, the currently designed magnetorheological brakes generally have the problem of insufficient output braking torque or too small torque-to-volume ratio; when the magnetorheological brake is working, the viscosity dissipation of the magnetorheological fluid and the heating of the excitation coil lead to temperature accumulation, which directly affects the rheological characteristics and mechanical properties of the magnetorheological fluid. Summary of the invention

[0004] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a liquid circulation magnetorheological brake, aiming to solve the technical problems in the prior art that traditional magnetorheological brakes have insufficient output braking torque or too small torque-to-volume ratio; when the magnetorheological brake is working, the temperature accumulates due to the viscous dissipation of the magnetorheological fluid and the heating of the excitation coil, which reduces the rheological characteristics and mechanical properties of the magnetorheological fluid.

[0005] In order to achieve the above-mentioned object, the present invention is implemented by the following technical scheme: a liquid flow circulation type magnetorheological brake, comprising a brake housing, a rotating shaft arranged on one side of the brake housing, and a brake disc arranged in the brake housing and connected to the rotating shaft, the brake housing comprising a transparent cover and an end cover arranged on one side of the transparent cover, a transparent disc is arranged on one side of the transparent cover, The rotating shaft includes a shaft head portion arranged on one side of the transparent cover, and a shaft tail portion arranged near one side of the end cover, and a brake annular disc is connected to the end surface of the shaft tail portion through a sinusoidal transmission mechanism. An excitation coil is provided in the brake housing, and the inner cavity of the brake housing includes a first inner cavity formed by the transparent disc and the transparent cover, and a second inner cavity formed by the transparent disc and the end cover, the brake disc is arranged in the first inner cavity, the brake annular disc is arranged in the second inner cavity, the first inner cavity and the second inner cavity form a magnetorheological fluid flow cavity for accommodating magnetorheological fluid, and the brake annular disc is used to promote the magnetorheological fluid to circulate in the magnetorheological fluid flow cavity; The two sides of the brake disc respectively form a first radial damping gap and a second radial damping gap with the transparent cover and the end surface of the transparent disc, the two sides of the brake ring disc respectively form a third radial damping gap and a fourth radial damping gap with the end surface of the transparent disc and the end cover, the brake disc is provided with a first flow groove through-through, and the transparent disc is provided with a second flow groove through-through.

[0006] According to one aspect of the above technical solution, the sinusoidal transmission mechanism includes a boss eccentrically arranged on the end face of the tail of the shaft, a connecting ring with a clearance fit with the boss, guide rods arranged on both sides of the connecting ring, and a guide ring for limiting the guide rods, and the brake ring disk is arranged on the guide rod.

[0007] According to one aspect of the above technical solution, a magnetic isolation ring is provided on one side of the excitation coil, a winding frame corresponding to the excitation coil is provided on the side of the end cover close to the transparent disk, and the magnetic isolation ring is interference fit with the winding frame.

[0008] According to one aspect of the above technical solution, the brake housing further includes a cylinder barrel disposed between the transparent cover and the end cover, and the excitation coil is disposed on one side of the cylinder barrel.

[0009] According to one aspect of the above technical solution, the transparent cover and the end cover are provided with first screws for fixing the two sides of the cylinder respectively, and the end cover is also provided with a second screw for fixing the winding frame and a third screw for fixing the guide ring.

[0010] According to one aspect of the above technical solution, the first flow groove includes a first arc-shaped groove provided on a side of the brake disc relatively close to the rotating shaft.

[0011] According to one aspect of the above technical solution, the second flow groove includes a second arc groove provided on a side of the transparent disk relatively close to the rotating shaft, and a third arc groove provided on a side of the transparent disk relatively far from the rotating shaft.

[0012] According to one aspect of the above technical solution, the brake annular disc is arranged on a side of the guide rod away from the connecting ring, and the brake annular disc is located between the second arc groove and the third arc groove.

[0013] According to one aspect of the above technical solution, the first inner cavity includes a first connecting groove arranged between the first radial damping gap and the second radial damping gap, and the first connecting groove is arranged on the side of the brake disc away from the rotating shaft. The second inner cavity includes a second connecting groove arranged between the third radial damping gap and the fourth radial damping gap, and the second connecting groove is arranged on the side of the brake ring disc away from the connecting ring. The third arc groove connects the first connecting groove and the second connecting groove.

[0014] According to one aspect of the above technical solution, the transparent cover, cylinder barrel, end cover, winding rack, brake disc, guide rail ring, connecting ring, brake ring disc, transparent disc and guide rod are all made of magnetic conductive materials, and the rotating shaft and the magnetic isolation ring are made of magnetic isolation materials.

[0015] Compared with the prior art, the beneficial effects of the present invention are: adopting the movement principle of the sinusoidal transmission structure to realize the conversion of the rotational motion of the rotating shaft into the radial linear reciprocating motion of the brake ring disk, and forming a shear-valve working mode, so as to provide a larger braking torque under the same volume; by setting a flow groove on the transparent disk and the brake disk, the shear-valve working chamber of the brake ring disk is connected with the disc shear working chamber, so as to realize the circulation of magnetorheological fluid between the two chambers; through the above design, it is achieved that a larger braking torque is output under the same volume, and the magnetorheological fluid circulates inside, thereby improving the performance of the magnetorheological fluid under the influence of temperature, and improving the service life and working stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic structural diagram of a liquid flow circulation type magnetorheological brake in one embodiment of the present invention; Figure 2 A schematic diagram of magnetic lines of force, damping gaps and liquid circulation channels in a liquid circulation type magnetorheological brake according to an embodiment of the present invention; Figure 3 It is a structural schematic diagram of a sinusoidal transmission mechanism in one embodiment of the present invention; Figure 4 It is a structural schematic diagram of a transparent disk in one embodiment of the present invention; Figure 5 A schematic diagram of the structure of a brake disc in one embodiment of the present invention; Description of main component symbols: Rotating shaft 1, transparent cover 2, cylinder 3, end cover 4, excitation coil 5, magnetic isolation ring 6, winding frame 7, brake disc 8, first flow groove 81, guide ring 9, lug 10, connecting ring 11, brake annular disc 12, transparent disc 13, second flow groove 131, guide rod 14, first radial damping gap 15, second radial damping gap 16, third radial damping gap 17, fourth radial damping gap 18; The following specific implementation manner will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0017] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0018] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0020] See also Figures 1 to 5 , shown is a liquid flow circulation magnetorheological brake in an embodiment of the present invention, including a brake housing, a rotating shaft 1 arranged on one side of the brake housing, and a brake disc 8 arranged in the brake housing and connected to the rotating shaft 1, the brake housing includes a transparent cover 2, and an end cover 4 arranged on one side of the transparent cover 2, and a transparent disc 13 is provided on one side of the transparent cover 2.

[0021] The rotating shaft 1 includes a shaft head portion disposed on one side of the transparent cover 2, and a shaft tail portion disposed near the end cover 4. The end surface of the shaft tail portion is connected to a brake annular disc 12 through a sine transmission mechanism. The left end of the rotating shaft 1 passes through the central through hole of the transparent cover 2, and a bearing is disposed between the two for fixing the shaft head of the rotating shaft 1. Specifically, oil retaining rings are placed on the left and right of the brake disc 8 for sealing. The left oil retaining ring contacts with the transparent cover 2, the bearing, and the sleeve on the rotating shaft 1 to achieve positioning, and the right oil retaining ring contacts with the rotating shaft 1 and the transparent disc 13 to achieve positioning.

[0022] An excitation coil 5 is provided in the brake housing, and the inner cavity of the brake housing includes a first inner cavity formed by the transparent disc 13 and the transparent cover 2, and a second inner cavity formed by the transparent disc 13 and the end cover 4. The brake disc 8 is arranged in the first inner cavity, and the brake annular disc 12 is arranged in the second inner cavity. The first inner cavity and the second inner cavity form a magnetorheological fluid flow cavity for accommodating magnetorheological fluid, and the brake annular disc 12 is used to promote the magnetorheological fluid to circulate in the magnetorheological fluid flow cavity.

[0023] The two sides of the brake disc 8 respectively form a first radial damping gap 15 and a second radial damping gap 16 with the end faces of the transparent cover 2 and the transparent disc 13, and the two sides of the brake annular disc 12 respectively form a third radial damping gap 17 and a fourth radial damping gap 18 with the end faces of the transparent disc 13 and the end cover 4. The brake disc 8 is provided with a first flow groove 81 through-through, and the transparent disc 13 is provided with a second flow groove 131 through-through. It can be understood that when the excitation coil 5 is energized with current, a magnetic field perpendicular to the gap is formed in the first radial damping gap 15, the second radial damping gap 16, the third radial damping gap 17 and the fourth radial damping gap 18, and the magnetorheological fluid in the gap produces a magnetorheological effect.

[0024] Specifically, in this embodiment, the sinusoidal transmission mechanism includes a lug 10 eccentrically arranged on the end face of the shaft tail, a connecting ring 11 with a clearance fit with the lug 10, guide rods 14 arranged on both sides of the connecting ring 11, and guide rail rings 9 for limiting the guide rods 14, and the brake ring disk 12 is arranged on the guide rod 14. Specifically, the lug 10 is obtained by milling the shaft tail and has a fixed center distance with the center of the rotating shaft 1. When the torque input causes the rotating shaft 1 to rotate, the lug 10 performs a circular motion accordingly. Since the inner surface of the connecting ring 11 is in clearance fit with the outer surface of the lug 10, the rotational motion of the lug 10 is transmitted to the connecting ring 11, so that the connecting ring 11 generates a corresponding motion trend. The guide rod 14 is transitionally matched with the rectangular grooves on both sides of the connecting ring 11, and is matched with the through-hole guide rails in the guide rail ring 9. When the connecting ring 11 moves under the drive of the protruding handle 10, due to its close connection with the guide rod 14, it will exert a force on the guide rod 14, thereby driving the guide rod 14 to make radial linear reciprocating motion under the constraint of the guide rail ring 9, so as to drive the brake annular disk 12 to work and promote the circulation of the magnetorheological fluid.

[0025] Furthermore, in some application scenarios of the present embodiment, when torque is input, the rotating shaft 1 is the active part that rotates, and the brake disc 8, the connecting ring 11, the brake annular disc 12 and the guide rod 14 are the driven parts; the brake disc 8 is axially and circumferentially positioned by a sleeve and a flat key to achieve synchronous rotation with the rotating shaft 1; the two ends of the guide rod 14 are respectively tightly connected to the connecting ring 11 and the brake annular disc 12, and cooperate with the through-hole guide rail in the guide rail ring 9 so that it can only slide along the through-hole guide rail; when the protruding handle 10 rotates one circle, the connecting ring 11, the guide rod 14 and the brake annular disc 12 make radial linear reciprocating motion once through the through-hole guide rail, and the lengths of the third radial damping gap 17 and the fourth radial damping gap 18 remain unchanged, and their positions change in the second inner cavity with the movement of the brake annular disc 12; when the brake annular disc 12 makes radial linear reciprocating motion, it squeezes and pushes the magnetorheological fluid through the transparent disc 13 to achieve circulation in the two working chambers.

[0026] Preferably, in this embodiment, a magnetic isolation ring 6 is provided on one side of the excitation coil 5, and a winding frame 7 corresponding to the excitation coil 5 is provided on the side of the end cover 4 close to the transparent disk 13, and the magnetic isolation ring 6 is interference fit with the winding frame 7.

[0027] The brake housing further comprises a cylinder 3 disposed between the transparent cover 2 and the end cover 4, and the excitation coil 5 is disposed on one side of the cylinder 3. The transparent cover 2 and the end cover 4 are provided with first screws for fixing the two sides of the cylinder 3 respectively, and the end cover 4 is further provided with a second screw for fixing the winding frame 7 and a third screw for fixing the guide ring 9.

[0028] Specifically, in this embodiment, the first flow groove 81 includes a first arc groove provided on the side of the brake disc 8 relatively close to the rotating shaft 1; the second flow groove 131 includes a second arc groove provided on the side of the transparent disc 13 relatively close to the rotating shaft 1, and a third arc groove provided on the side of the transparent disc 13 relatively far from the rotating shaft 1. Preferably, in this embodiment, the cross section of the first arc groove is rectangular, the cross sections of the second arc groove and the third arc groove are trapezoidal, and the cross sections of the second arc groove and the third arc groove are relatively symmetrically arranged, that is, the side with a larger opening of the second arc groove is arranged toward the first inner cavity, and the side with a larger opening of the third arc groove is arranged toward the second inner cavity.

[0029] Furthermore, the brake annular disc 12 is disposed on a side of the guide rod 14 away from the connecting ring 11 , and the brake annular disc 12 is located between the second arc groove and the third arc groove.

[0030] Specifically, in this embodiment, the above-mentioned first inner cavity includes a first connecting groove arranged between the first radial damping gap 15 and the second radial damping gap 16, and the first connecting groove is arranged on the side of the brake disc 8 away from the rotating shaft 1, and the second inner cavity includes a second connecting groove arranged between the third radial damping gap 17 and the fourth radial damping gap 18, and the second connecting groove is arranged on the side of the brake ring disc 12 away from the connecting ring 11, and the third arc groove connects the first connecting groove and the second connecting groove.

[0031] In some application scenarios of this embodiment, when the brake annular disk 12 moves along the side wall of the second connecting groove, the magnetorheological fluid passes through the third arc-shaped groove and flows in the second inner cavity and the first inner cavity.

[0032] Preferably, the transparent cover 2, cylinder 3, end cover 4, winding frame 7, brake disc 8, guide ring 9, connecting ring 11, brake ring disc 12, transparent disc 13 and guide rod 14 are all made of magnetic conductive materials, and the rotating shaft 1 and the magnetic isolation ring 6 are made of magnetic isolation materials.

[0033] In summary, the liquid circulation magnetorheological brake in the above-mentioned embodiment of the present invention adopts the movement principle of the sinusoidal transmission structure to realize the conversion of the rotational motion of the rotating shaft 1 into the radial linear reciprocating motion of the brake ring disk 12, and form a shear-valve working mode, so as to provide a larger braking torque under the same volume; by setting a flow groove on the transparent disk 13 and the brake disk 8, the shear-valve working chamber of the brake ring disk 12 is connected with the disc shear working chamber, so as to realize the circulation of magnetorheological fluid between the two chambers; through the above design, it is achieved that a larger braking torque is output under the same volume, and the magnetorheological fluid circulates inside, thereby improving the performance of the magnetorheological fluid under the influence of temperature, and improving the service life and working stability.

[0034] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0035] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A liquid circulation type magnetorheological brake, characterized in that: The invention comprises a brake housing, a rotating shaft arranged at one side of the brake housing, and a brake disc arranged in the brake housing and connected to the rotating shaft. The brake housing comprises a transparent cover and an end cover arranged at one side of the transparent cover. A transparent disc is arranged at one side of the transparent cover. The rotating shaft includes a shaft head portion arranged on one side of the transparent cover, and a shaft tail portion arranged near one side of the end cover, and a brake annular disc is connected to the end surface of the shaft tail portion through a sinusoidal transmission mechanism. An excitation coil is provided in the brake housing, and the inner cavity of the brake housing includes a first inner cavity formed by the transparent disc and the transparent cover, and a second inner cavity formed by the transparent disc and the end cover, the brake disc is arranged in the first inner cavity, the brake annular disc is arranged in the second inner cavity, the first inner cavity and the second inner cavity form a magnetorheological fluid flow cavity for accommodating magnetorheological fluid, and the brake annular disc is used to promote the magnetorheological fluid to circulate in the magnetorheological fluid flow cavity; The two sides of the brake disc respectively form a first radial damping gap and a second radial damping gap with the transparent cover and the end surface of the transparent disc, the two sides of the brake ring disc respectively form a third radial damping gap and a fourth radial damping gap with the end surface of the transparent disc and the end cover, the brake disc is provided with a first flow groove through-through, and the transparent disc is provided with a second flow groove through-through.

2. The liquid circulation type magnetorheological brake according to claim 1, characterized in that: The sinusoidal transmission mechanism includes a lug eccentrically arranged on the end face of the shaft tail, a connecting ring with a clearance fit with the lug, a guide rod arranged on both sides of the connecting ring, and a guide ring for limiting the guide rod, and the brake ring disk is arranged on the guide rod.

3. The liquid circulation type magnetorheological brake according to claim 2, characterized in that: A magnetic isolation ring is provided on one side of the excitation coil, and a winding frame corresponding to the excitation coil is provided on the side of the end cover close to the transparent disk, and the magnetic isolation ring is interference-fitted with the winding frame.

4. The liquid flow circulation type magnetorheological brake according to claim 3, characterized in that: The brake housing further comprises a cylinder barrel arranged between the transparent cover and the end cover, and the excitation coil is arranged on one side of the cylinder barrel.

5. The liquid flow circulation type magnetorheological brake according to claim 4, characterized in that: The transparent cover and the end cover are provided with first screws for fixing the two sides of the cylinder respectively, and the end cover is also provided with a second screw for fixing the winding frame and a third screw for fixing the guide ring.

6. The liquid flow circulation type magnetorheological brake according to claim 1, characterized in that: The first flow groove includes a first arc-shaped groove arranged on a side of the brake disc relatively close to the rotating shaft.

7. The liquid circulation type magnetorheological brake according to claim 2, characterized in that: The second flow groove includes a second arc groove arranged on a side of the transparent disk relatively close to the rotating shaft, and a third arc groove arranged on a side of the transparent disk relatively far from the rotating shaft.

8. The liquid flow circulation type magnetorheological brake according to claim 7, characterized in that: The brake annular disc is arranged on a side of the guide rod away from the connecting ring, and the brake annular disc is located between the second arc groove and the third arc groove.

9. The liquid circulation type magnetorheological brake according to claim 7, characterized in that: The first inner cavity includes a first connecting groove arranged between the first radial damping gap and the second radial damping gap, and the first connecting groove is arranged on the side of the brake disc away from the rotating shaft. The second inner cavity includes a second connecting groove arranged between the third radial damping gap and the fourth radial damping gap, and the second connecting groove is arranged on the side of the brake ring disc away from the connecting ring. The third arc groove connects the first connecting groove and the second connecting groove.

10. The liquid flow circulation type magnetorheological brake according to claim 3, characterized in that: The transparent cover, cylinder barrel, end cover, winding frame, brake disc, guide rail ring, connecting ring, brake ring disc, transparent disc and guide rod are all made of magnetic conductive materials, and the rotating shaft and the magnetic isolation ring are made of magnetic isolation materials.

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